diff --git a/nearby/.dockerignore b/nearby/.dockerignore
deleted file mode 100644
index 8bd0a19..0000000
--- a/nearby/.dockerignore
+++ /dev/null
@@ -1,17 +0,0 @@
-/.idea
-/.git
-/target
-/.dockerignore
-/.gitignore
-
-/presence/_deps
-/presence/ldt_np_adv_ffi/target
-/presence/*/fuzz/target
-/presence/*/fuzz/corpus
-/presence/cmake-build
-/connections/ukey2/*/fuzz/target
-/connections/ukey2/*/fuzz/corpus
-/crypto/crypto_provider_boringssl/target
-
-**/CMakeCache.txt
-**/CMakeFiles
diff --git a/nearby/Cargo.lock b/nearby/Cargo.lock
index 63c63ac..76582bf 100644
--- a/nearby/Cargo.lock
+++ b/nearby/Cargo.lock
@@ -3,10 +3,13 @@
 version = 3
 
 [[package]]
-name = "Inflector"
-version = "0.11.4"
+name = "addr2line"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
+checksum = "f4fa78e18c64fce05e902adecd7a5eed15a5e0a3439f7b0e169f0252214865e3"
+dependencies = [
+ "gimli",
+]
 
 [[package]]
 name = "adler"
@@ -27,9 +30,9 @@
 
 [[package]]
 name = "aes"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433cfd6710c9986c576a25ca913c39d66a6474107b406f34f91d4a8923395241"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
 dependencies = [
  "cfg-if",
  "cipher",
@@ -52,19 +55,21 @@
 ]
 
 [[package]]
-name = "aho-corasick"
-version = "0.7.20"
+name = "ahash"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
 dependencies = [
- "memchr",
+ "cfg-if",
+ "once_cell",
+ "version_check",
 ]
 
 [[package]]
 name = "aho-corasick"
-version = "1.0.1"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67fc08ce920c31afb70f013dcce1bfc3a3195de6a228474e45e1f145b36f8d04"
+checksum = "43f6cb1bf222025340178f382c426f13757b2960e89779dfcb319c32542a5a41"
 dependencies = [
  "memchr",
 ]
@@ -76,6 +81,12 @@
 checksum = "250f629c0161ad8107cf89319e990051fae62832fd343083bea452d93e2205fd"
 
 [[package]]
+name = "allocator-api2"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
+
+[[package]]
 name = "android-tzdata"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -113,15 +124,15 @@
 
 [[package]]
 name = "anstyle"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41ed9a86bf92ae6580e0a31281f65a1b1d867c0cc68d5346e2ae128dddfa6a7d"
+checksum = "3a30da5c5f2d5e72842e00bcb57657162cdabef0931f40e2deb9b4140440cecd"
 
 [[package]]
 name = "anstyle-parse"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e765fd216e48e067936442276d1d57399e37bce53c264d6fefbe298080cb57ee"
+checksum = "938874ff5980b03a87c5524b3ae5b59cf99b1d6bc836848df7bc5ada9643c333"
 dependencies = [
  "utf8parse",
 ]
@@ -147,9 +158,9 @@
 
 [[package]]
 name = "anyhow"
-version = "1.0.71"
+version = "1.0.72"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c7d0618f0e0b7e8ff11427422b64564d5fb0be1940354bfe2e0529b18a9d9b8"
+checksum = "3b13c32d80ecc7ab747b80c3784bce54ee8a7a0cc4fbda9bf4cda2cf6fe90854"
 
 [[package]]
 name = "array_ref"
@@ -177,6 +188,21 @@
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
+name = "backtrace"
+version = "0.3.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4319208da049c43661739c5fade2ba182f09d1dc2299b32298d3a31692b17e12"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
 name = "base16ct"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -190,9 +216,9 @@
 
 [[package]]
 name = "base64"
-version = "0.21.0"
+version = "0.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4a4ddaa51a5bc52a6948f74c06d20aaaddb71924eab79b8c97a8c556e942d6a"
+checksum = "604178f6c5c21f02dc555784810edfb88d34ac2c73b2eae109655649ee73ce3d"
 
 [[package]]
 name = "base64ct"
@@ -207,6 +233,12 @@
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
+name = "bitflags"
+version = "2.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "630be753d4e58660abd17930c71b647fe46c27ea6b63cc59e1e3851406972e42"
+
+[[package]]
 name = "blake2"
 version = "0.10.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -245,9 +277,9 @@
 
 [[package]]
 name = "bstr"
-version = "1.5.0"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a246e68bb43f6cd9db24bea052a53e40405417c5fb372e3d1a8a7f770a564ef5"
+checksum = "6798148dccfbff0fae41c7574d2fa8f1ef3492fba0face179de5d8d447d67b05"
 dependencies = [
  "memchr",
  "serde",
@@ -258,9 +290,9 @@
 version = "0.1.0"
 dependencies = [
  "anyhow",
- "base64 0.21.0",
+ "base64 0.21.2",
  "chrono",
- "clap 4.2.7",
+ "clap 4.3.19",
  "crossbeam",
  "env_logger",
  "globset",
@@ -273,13 +305,14 @@
  "thiserror",
  "tinytemplate",
  "walkdir",
+ "which",
 ]
 
 [[package]]
 name = "bumpalo"
-version = "3.12.2"
+version = "3.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c6ed94e98ecff0c12dd1b04c15ec0d7d9458ca8fe806cea6f12954efe74c63b"
+checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
 [[package]]
 name = "byteorder"
@@ -381,7 +414,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "clap_lex 0.2.4",
  "indexmap",
  "textwrap",
@@ -389,9 +422,9 @@
 
 [[package]]
 name = "clap"
-version = "4.2.7"
+version = "4.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34d21f9bf1b425d2968943631ec91202fe5e837264063503708b83013f8fc938"
+checksum = "5fd304a20bff958a57f04c4e96a2e7594cc4490a0e809cbd48bb6437edaa452d"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -400,27 +433,26 @@
 
 [[package]]
 name = "clap_builder"
-version = "4.2.7"
+version = "4.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "914c8c79fb560f238ef6429439a30023c862f7a28e688c58f7203f12b29970bd"
+checksum = "01c6a3f08f1fe5662a35cfe393aec09c4df95f60ee93b7556505260f75eee9e1"
 dependencies = [
  "anstream",
  "anstyle",
- "bitflags",
- "clap_lex 0.4.1",
+ "clap_lex 0.5.0",
  "strsim",
 ]
 
 [[package]]
 name = "clap_derive"
-version = "4.2.0"
+version = "4.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f9644cd56d6b87dbe899ef8b053e331c0637664e9e21a33dfcdc36093f5c5c4"
+checksum = "54a9bb5758fc5dfe728d1019941681eccaf0cf8a4189b692a0ee2f2ecf90a050"
 dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.15",
+ "syn 2.0.28",
 ]
 
 [[package]]
@@ -434,9 +466,9 @@
 
 [[package]]
 name = "clap_lex"
-version = "0.4.1"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a2dd5a6fe8c6e3502f568a6353e5273bbb15193ad9a89e457b9970798efbea1"
+checksum = "2da6da31387c7e4ef160ffab6d5e7f00c42626fe39aea70a7b0f1773f7dd6c1b"
 
 [[package]]
 name = "colorchoice"
@@ -456,9 +488,9 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
 
 [[package]]
 name = "core-foundation-sys"
@@ -468,9 +500,9 @@
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.7"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e4c1eaa2012c47becbbad2ab175484c2a84d1185b566fb2cc5b8707343dfe58"
+checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
 dependencies = [
  "libc",
 ]
@@ -557,9 +589,9 @@
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.9.14"
+version = "0.9.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46bd5f3f85273295a9d14aedfb86f6aadbff6d8f5295c4a9edb08e819dcf5695"
+checksum = "ae211234986c545741a7dc064309f67ee1e5ad243d0e48335adc0484d960bcc7"
 dependencies = [
  "autocfg",
  "cfg-if",
@@ -580,9 +612,9 @@
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.15"
+version = "0.8.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c063cd8cc95f5c377ed0d4b49a4b21f632396ff690e8470c29b3359b346984b"
+checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
 dependencies = [
  "cfg-if",
 ]
@@ -653,7 +685,7 @@
  "hex-literal",
  "openssl",
  "ouroboros",
- "rstest",
+ "rstest 0.17.0",
 ]
 
 [[package]]
@@ -699,7 +731,7 @@
  "hex-literal",
  "rand",
  "rand_ext",
- "rstest",
+ "rstest 0.17.0",
  "rstest_reuse",
  "test_helper",
  "wycheproof",
@@ -716,24 +748,37 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-rc.2"
+version = "4.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
+checksum = "436ace70fc06e06f7f689d2624dc4e2f0ea666efb5aa704215f7249ae6e047a7"
 dependencies = [
  "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
  "digest",
  "fiat-crypto",
- "packed_simd_2",
  "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
 [[package]]
-name = "der"
-version = "0.7.5"
+name = "curve25519-dalek-derive"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "05e58dffcdcc8ee7b22f0c1f71a69243d7c2d9ad87b5a14361f2424a1565c219"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.28",
+]
+
+[[package]]
+name = "der"
+version = "0.7.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -758,9 +803,9 @@
 
 [[package]]
 name = "digest"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
@@ -779,9 +824,9 @@
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "798f704d128510932661a3489b08e3f4c934a01d61c5def59ae7b8e48f19665a"
+checksum = "faa8e9049d5d72bfc12acbc05914731b5322f79b5e2f195e9f2d705fca22ab4c"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
@@ -793,15 +838,15 @@
 
 [[package]]
 name = "either"
-version = "1.8.1"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
+checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.4"
+version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75c71eaa367f2e5d556414a8eea812bc62985c879748d6403edabd9cb03f16e7"
+checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -840,9 +885,9 @@
 
 [[package]]
 name = "errno"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a"
+checksum = "6b30f669a7961ef1631673d2766cc92f52d64f7ef354d4fe0ddfd30ed52f0f4f"
 dependencies = [
  "errno-dragonfly",
  "libc",
@@ -861,12 +906,9 @@
 
 [[package]]
 name = "fastrand"
-version = "1.9.0"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e51093e27b0797c359783294ca4f0a911c270184cb10f85783b118614a1501be"
-dependencies = [
- "instant",
-]
+checksum = "6999dc1837253364c2ebb0704ba97994bd874e8f195d665c50b7548f6ea92764"
 
 [[package]]
 name = "ff"
@@ -980,7 +1022,7 @@
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.15",
+ "syn 2.0.28",
 ]
 
 [[package]]
@@ -1032,9 +1074,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c85e1d9ab2eadba7e5040d4e09cbd6d072b76a557ad64e797c2cb9d4da21d7e4"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "libc",
@@ -1042,12 +1084,18 @@
 ]
 
 [[package]]
-name = "globset"
-version = "0.4.10"
+name = "gimli"
+version = "0.27.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "029d74589adefde59de1a0c4f4732695c32805624aec7b68d91503d4dba79afc"
+checksum = "b6c80984affa11d98d1b88b66ac8853f143217b399d3c74116778ff8fdb4ed2e"
+
+[[package]]
+name = "globset"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aca8bbd8e0707c1887a8bbb7e6b40e228f251ff5d62c8220a4a7a53c73aff006"
 dependencies = [
- "aho-corasick 0.7.20",
+ "aho-corasick",
  "bstr",
  "fnv",
  "log",
@@ -1067,9 +1115,9 @@
 
 [[package]]
 name = "h2"
-version = "0.3.19"
+version = "0.3.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d357c7ae988e7d2182f7d7871d0b963962420b0678b0997ce7de72001aeab782"
+checksum = "97ec8491ebaf99c8eaa73058b045fe58073cd6be7f596ac993ced0b0a0c01049"
 dependencies = [
  "bytes",
  "fnv",
@@ -1091,12 +1139,34 @@
 checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
 
 [[package]]
+name = "handle_map"
+version = "0.1.0"
+dependencies = [
+ "criterion",
+ "crypto_provider",
+ "hashbrown 0.14.0",
+ "lock_api",
+ "portable-atomic",
+ "spin 0.9.8",
+]
+
+[[package]]
 name = "hashbrown"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 
 [[package]]
+name = "hashbrown"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
+dependencies = [
+ "ahash",
+ "allocator-api2",
+]
+
+[[package]]
 name = "hdrhistogram"
 version = "7.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1127,18 +1197,9 @@
 
 [[package]]
 name = "hermit-abi"
-version = "0.2.6"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee512640fe35acbfb4bb779db6f0d80704c2cacfa2e39b601ef3e3f47d1ae4c7"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "hermit-abi"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
 
 [[package]]
 name = "hex"
@@ -1148,9 +1209,9 @@
 
 [[package]]
 name = "hex-literal"
-version = "0.3.4"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ebdb29d2ea9ed0083cd8cece49bbd968021bd99b0849edb4a9a7ee0fdf6a4e0"
+checksum = "6fe2267d4ed49bc07b63801559be28c718ea06c4738b7a03c94df7386d2cde46"
 
 [[package]]
 name = "hkdf"
@@ -1212,9 +1273,9 @@
 
 [[package]]
 name = "hyper"
-version = "0.14.26"
+version = "0.14.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab302d72a6f11a3b910431ff93aae7e773078c769f0a3ef15fb9ec692ed147d4"
+checksum = "ffb1cfd654a8219eaef89881fdb3bb3b1cdc5fa75ded05d6933b2b382e395468"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -1236,10 +1297,11 @@
 
 [[package]]
 name = "hyper-rustls"
-version = "0.24.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0646026eb1b3eea4cd9ba47912ea5ce9cc07713d105b1a14698f4e6433d348b7"
+checksum = "8d78e1e73ec14cf7375674f74d7dde185c8206fd9dea6fb6295e8a98098aaa97"
 dependencies = [
+ "futures-util",
  "http",
  "hyper",
  "rustls",
@@ -1287,10 +1349,16 @@
 checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
 dependencies = [
  "autocfg",
- "hashbrown",
+ "hashbrown 0.12.3",
 ]
 
 [[package]]
+name = "init_with"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0175f63815ce00183bf755155ad0cb48c65226c5d17a724e369c25418d2b7699"
+
+[[package]]
 name = "inout"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1301,39 +1369,18 @@
 ]
 
 [[package]]
-name = "instant"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
-dependencies = [
- "cfg-if",
-]
-
-[[package]]
-name = "io-lifetimes"
-version = "1.0.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c66c74d2ae7e79a5a8f7ac924adbe38ee42a859c6539ad869eb51f0b52dc220"
-dependencies = [
- "hermit-abi 0.3.1",
- "libc",
- "windows-sys 0.48.0",
-]
-
-[[package]]
 name = "ipnet"
-version = "2.7.2"
+version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12b6ee2129af8d4fb011108c73d99a1b83a85977f23b82460c0ae2e25bb4b57f"
+checksum = "28b29a3cd74f0f4598934efe3aeba42bae0eb4680554128851ebbecb02af14e6"
 
 [[package]]
 name = "is-terminal"
-version = "0.4.7"
+version = "0.4.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adcf93614601c8129ddf72e2d5633df827ba6551541c6d8c59520a371475be1f"
+checksum = "cb0889898416213fab133e1d33a0e5858a48177452750691bde3666d0fdbaf8b"
 dependencies = [
- "hermit-abi 0.3.1",
- "io-lifetimes",
+ "hermit-abi 0.3.2",
  "rustix",
  "windows-sys 0.48.0",
 ]
@@ -1349,9 +1396,9 @@
 
 [[package]]
 name = "itoa"
-version = "1.0.6"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "453ad9f582a441959e5f0d088b02ce04cfe8d51a8eaf077f12ac6d3e94164ca6"
+checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "jni"
@@ -1377,9 +1424,9 @@
 
 [[package]]
 name = "js-sys"
-version = "0.3.62"
+version = "0.3.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "68c16e1bfd491478ab155fd8b4896b86f9ede344949b641e61501e07c2b8b4d5"
+checksum = "c5f195fe497f702db0f318b07fdd68edb16955aed830df8363d837542f8f935a"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -1399,9 +1446,9 @@
 dependencies = [
  "aes",
  "anyhow",
- "base64 0.21.0",
+ "base64 0.21.2",
  "blake2",
- "clap 4.2.7",
+ "clap 4.3.19",
  "criterion",
  "crypto_provider",
  "crypto_provider_default",
@@ -1426,7 +1473,7 @@
 dependencies = [
  "anyhow",
  "array_view",
- "base64 0.21.0",
+ "base64 0.21.2",
  "criterion",
  "crypto_provider",
  "crypto_provider_default",
@@ -1466,21 +1513,15 @@
 
 [[package]]
 name = "libc"
-version = "0.2.144"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b00cc1c228a6782d0f076e7b232802e0c5689d41bb5df366f2a6b6621cfdfe1"
-
-[[package]]
-name = "libm"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "linux-raw-sys"
-version = "0.3.7"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ece97ea872ece730aed82664c424eb4c8291e1ff2480247ccf7409044bc6479f"
+checksum = "09fc20d2ca12cb9f044c93e3bd6d32d523e6e2ec3db4f7b2939cd99026ecd3f0"
 
 [[package]]
 name = "lock_adapter"
@@ -1491,9 +1532,9 @@
 
 [[package]]
 name = "lock_api"
-version = "0.4.9"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "435011366fe56583b16cf956f9df0095b405b82d76425bc8981c0e22e60ec4df"
+checksum = "c1cc9717a20b1bb222f333e6a92fd32f7d8a18ddc5a3191a11af45dcbf4dcd16"
 dependencies = [
  "autocfg",
  "scopeguard",
@@ -1501,12 +1542,9 @@
 
 [[package]]
 name = "log"
-version = "0.4.17"
+version = "0.4.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
-dependencies = [
- "cfg-if",
-]
+checksum = "b06a4cde4c0f271a446782e3eff8de789548ce57dbc8eca9292c27f4a42004b4"
 
 [[package]]
 name = "memchr"
@@ -1516,9 +1554,9 @@
 
 [[package]]
 name = "memoffset"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d61c719bcfbcf5d62b3a09efa6088de8c54bc0bfcd3ea7ae39fcc186108b8de1"
+checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
 dependencies = [
  "autocfg",
 ]
@@ -1566,6 +1604,56 @@
 ]
 
 [[package]]
+name = "np_adv"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "array_view",
+ "criterion",
+ "crypto_provider",
+ "crypto_provider_default",
+ "hex",
+ "init_with",
+ "lazy_static",
+ "ldt",
+ "ldt_np_adv",
+ "nom",
+ "np_ed25519",
+ "np_hkdf",
+ "rand",
+ "rand_ext",
+ "serde_json",
+ "sink",
+ "strum",
+ "strum_macros",
+ "test_helper",
+ "tinyvec",
+ "xts_aes",
+]
+
+[[package]]
+name = "np_ed25519"
+version = "0.1.0"
+dependencies = [
+ "array_view",
+ "crypto_provider",
+ "sink",
+ "tinyvec",
+]
+
+[[package]]
+name = "np_ffi_core"
+version = "0.1.0"
+dependencies = [
+ "array_view",
+ "crypto_provider",
+ "crypto_provider_default",
+ "handle_map",
+ "np_adv",
+ "spin 0.9.8",
+]
+
+[[package]]
 name = "np_hkdf"
 version = "0.1.0"
 dependencies = [
@@ -1605,28 +1693,37 @@
 
 [[package]]
 name = "num-traits"
-version = "0.2.15"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+checksum = "f30b0abd723be7e2ffca1272140fac1a2f084c77ec3e123c192b66af1ee9e6c2"
 dependencies = [
  "autocfg",
 ]
 
 [[package]]
 name = "num_cpus"
-version = "1.15.0"
+version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fac9e2da13b5eb447a6ce3d392f23a29d8694bff781bf03a16cd9ac8697593b"
+checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi 0.2.6",
+ "hermit-abi 0.3.2",
  "libc",
 ]
 
 [[package]]
-name = "once_cell"
-version = "1.17.1"
+name = "object"
+version = "0.31.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "8bda667d9f2b5051b8833f59f3bf748b28ef54f850f4fcb389a252aa383866d1"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "oorandom"
@@ -1642,11 +1739,11 @@
 
 [[package]]
 name = "openssl"
-version = "0.10.52"
+version = "0.10.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01b8574602df80f7b85fdfc5392fa884a4e3b3f4f35402c070ab34c3d3f78d56"
+checksum = "345df152bc43501c5eb9e4654ff05f794effb78d4efe3d53abc158baddc0703d"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cfg-if",
  "foreign-types",
  "libc",
@@ -1663,14 +1760,14 @@
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.15",
+ "syn 2.0.28",
 ]
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.87"
+version = "0.9.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e17f59264b2809d77ae94f0e1ebabc434773f370d6ca667bd223ea10e06cc7e"
+checksum = "374533b0e45f3a7ced10fcaeccca020e66656bc03dac384f852e4e5a7a8104a6"
 dependencies = [
  "bssl-sys",
  "cc",
@@ -1681,31 +1778,32 @@
 
 [[package]]
 name = "os_str_bytes"
-version = "6.5.0"
+version = "6.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ceedf44fb00f2d1984b0bc98102627ce622e083e49a5bacdb3e514fa4238e267"
+checksum = "4d5d9eb14b174ee9aa2ef96dc2b94637a2d4b6e7cb873c7e171f0c20c6cf3eac"
 
 [[package]]
 name = "ouroboros"
-version = "0.15.6"
+version = "0.17.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1358bd1558bd2a083fed428ffeda486fbfb323e698cdda7794259d592ca72db"
+checksum = "e2ba07320d39dfea882faa70554b4bd342a5f273ed59ba7c1c6b4c840492c954"
 dependencies = [
  "aliasable",
  "ouroboros_macro",
+ "static_assertions",
 ]
 
 [[package]]
 name = "ouroboros_macro"
-version = "0.15.6"
+version = "0.17.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f7d21ccd03305a674437ee1248f3ab5d4b1db095cf1caf49f1713ddf61956b7"
+checksum = "ec4c6225c69b4ca778c0aea097321a64c421cf4577b331c61b229267edabb6f8"
 dependencies = [
- "Inflector",
+ "heck",
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.28",
 ]
 
 [[package]]
@@ -1725,16 +1823,6 @@
 ]
 
 [[package]]
-name = "packed_simd_2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
-dependencies = [
- "cfg-if",
- "libm",
-]
-
-[[package]]
 name = "percent-encoding"
 version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1742,9 +1830,9 @@
 
 [[package]]
 name = "pin-project-lite"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
+checksum = "4c40d25201921e5ff0c862a505c6557ea88568a4e3ace775ab55e93f2f4f9d57"
 
 [[package]]
 name = "pin-utils"
@@ -1776,9 +1864,9 @@
 
 [[package]]
 name = "plotters"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2538b639e642295546c50fcd545198c9d64ee2a38620a628724a3b266d5fbf97"
+checksum = "d2c224ba00d7cadd4d5c660deaf2098e5e80e07846537c51f9cfa4be50c1fd45"
 dependencies = [
  "num-traits",
  "plotters-backend",
@@ -1789,24 +1877,24 @@
 
 [[package]]
 name = "plotters-backend"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "193228616381fecdc1224c62e96946dfbc73ff4384fba576e052ff8c1bea8142"
+checksum = "9e76628b4d3a7581389a35d5b6e2139607ad7c75b17aed325f210aa91f4a9609"
 
 [[package]]
 name = "plotters-svg"
-version = "0.3.3"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9a81d2759aae1dae668f783c308bc5c8ebd191ff4184aaa1b37f65a6ae5a56f"
+checksum = "38f6d39893cca0701371e3c27294f09797214b86f1fb951b89ade8ec04e2abab"
 dependencies = [
  "plotters-backend",
 ]
 
 [[package]]
 name = "polyval"
-version = "0.6.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef234e08c11dfcb2e56f79fd70f6f2eb7f025c0ce2333e82f4f0518ecad30c6"
+checksum = "d52cff9d1d4dee5fe6d03729099f4a310a41179e0a10dbf542039873f2e826fb"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -1815,6 +1903,12 @@
 ]
 
 [[package]]
+name = "portable-atomic"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f32154ba0af3a075eefa1eda8bb414ee928f62303a54ea85b8d6638ff1a6ee9e"
+
+[[package]]
 name = "ppv-lite86"
 version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1822,9 +1916,9 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.1"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf8d3875361e28f7753baefef104386e7aa47642c93023356d97fdef4003bfb5"
+checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
 dependencies = [
  "elliptic-curve",
 ]
@@ -1855,9 +1949,9 @@
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.56"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b63bdb0cd06f1f4dedf69b254734f9b45af66e4a031e42a7480257d9898b435"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
@@ -1915,9 +2009,9 @@
 
 [[package]]
 name = "quote"
-version = "1.0.27"
+version = "1.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f4f29d145265ec1c483c7c654450edde0bfe043d3938d6972630663356d9500"
+checksum = "50f3b39ccfb720540debaa0164757101c08ecb8d326b15358ce76a62c7e85965"
 dependencies = [
  "proc-macro2",
 ]
@@ -2013,25 +2107,37 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
 ]
 
 [[package]]
 name = "regex"
-version = "1.8.1"
+version = "1.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af83e617f331cc6ae2da5443c602dfa5af81e517212d9d611a5b3ba1777b5370"
+checksum = "b2eae68fc220f7cf2532e4494aded17545fce192d59cd996e0fe7887f4ceb575"
 dependencies = [
- "aho-corasick 1.0.1",
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7b6d6190b7594385f61bd3911cd1be99dfddcfc365a4160cc2ab5bff4aed294"
+dependencies = [
+ "aho-corasick",
  "memchr",
  "regex-syntax",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.7.1"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5996294f19bd3aae0453a862ad728f60e6600695733dd5df01da90c54363a3c"
+checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
 
 [[package]]
 name = "reqwest"
@@ -2039,7 +2145,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cde824a14b7c14f85caff81225f411faacc04a2013f41670f41443742b1c1c55"
 dependencies = [
- "base64 0.21.0",
+ "base64 0.21.2",
  "bytes",
  "encoding_rs",
  "futures-core",
@@ -2095,7 +2201,17 @@
 dependencies = [
  "futures",
  "futures-timer",
- "rstest_macros",
+ "rstest_macros 0.16.0",
+ "rustc_version",
+]
+
+[[package]]
+name = "rstest"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de1bb486a691878cd320c2f0d319ba91eeaa2e894066d8b5f8f117c000e9d962"
+dependencies = [
+ "rstest_macros 0.17.0",
  "rustc_version",
 ]
 
@@ -2114,6 +2230,20 @@
 ]
 
 [[package]]
+name = "rstest_macros"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "290ca1a1c8ca7edb7c3283bd44dc35dd54fdec6253a3912e201ba1072018fca8"
+dependencies = [
+ "cfg-if",
+ "proc-macro2",
+ "quote",
+ "rustc_version",
+ "syn 1.0.109",
+ "unicode-ident",
+]
+
+[[package]]
 name = "rstest_reuse"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2126,6 +2256,12 @@
 ]
 
 [[package]]
+name = "rustc-demangle"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
+
+[[package]]
 name = "rustc_version"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2136,13 +2272,12 @@
 
 [[package]]
 name = "rustix"
-version = "0.37.19"
+version = "0.38.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "acf8729d8542766f1b2cf77eb034d52f40d375bb8b615d0b147089946e16613d"
+checksum = "0a962918ea88d644592894bc6dc55acc6c0956488adcebbfb6e273506b7fd6e5"
 dependencies = [
- "bitflags",
+ "bitflags 2.3.3",
  "errno",
- "io-lifetimes",
  "libc",
  "linux-raw-sys",
  "windows-sys 0.48.0",
@@ -2150,9 +2285,9 @@
 
 [[package]]
 name = "rustls"
-version = "0.21.2"
+version = "0.21.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e32ca28af694bc1bbf399c33a516dbdf1c90090b8ab23c2bc24f834aa2247f5f"
+checksum = "79ea77c539259495ce8ca47f53e66ae0330a8819f67e23ac96ca02f50e7b7d36"
 dependencies = [
  "log",
  "ring",
@@ -2162,28 +2297,34 @@
 
 [[package]]
 name = "rustls-pemfile"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d194b56d58803a43635bdc398cd17e383d6f71f9182b9a192c127ca42494a59b"
+checksum = "2d3987094b1d07b653b7dfdc3f70ce9a1da9c51ac18c1b06b662e4f9a0e9f4b2"
 dependencies = [
- "base64 0.21.0",
+ "base64 0.21.2",
 ]
 
 [[package]]
 name = "rustls-webpki"
-version = "0.100.1"
+version = "0.101.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6207cd5ed3d8dca7816f8f3725513a34609c0c765bf652b8c3cb4cfd87db46b"
+checksum = "513722fd73ad80a71f72b61009ea1b584bcfa1483ca93949c8f290298837fa59"
 dependencies = [
  "ring",
  "untrusted",
 ]
 
 [[package]]
-name = "ryu"
-version = "1.0.13"
+name = "rustversion"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f91339c0467de62360649f8d3e185ca8de4224ff281f66000de5eb2a77a79041"
+checksum = "7ffc183a10b4478d04cbbbfc96d0873219d962dd5accaff2ffbd4ceb7df837f4"
+
+[[package]]
+name = "ryu"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
 
 [[package]]
 name = "same-file"
@@ -2196,9 +2337,9 @@
 
 [[package]]
 name = "scopeguard"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
 [[package]]
 name = "sct"
@@ -2212,9 +2353,9 @@
 
 [[package]]
 name = "sec1"
-version = "0.7.2"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0aec48e813d6b90b15f0b8948af3c63483992dee44c03e9930b3eebdabe046e"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
 dependencies = [
  "base16ct",
  "der",
@@ -2225,35 +2366,35 @@
 
 [[package]]
 name = "semver"
-version = "1.0.17"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bebd363326d05ec3e2f532ab7660680f3b02130d780c299bca73469d521bc0ed"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
 
 [[package]]
 name = "serde"
-version = "1.0.162"
+version = "1.0.179"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "71b2f6e1ab5c2b98c05f0f35b236b22e8df7ead6ffbf51d7808da7f8817e7ab6"
+checksum = "0a5bf42b8d227d4abf38a1ddb08602e229108a517cd4e5bb28f9c7eaafdce5c0"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.162"
+version = "1.0.179"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2a0814352fd64b58489904a44ea8d90cb1a91dcb6b4f5ebabc32c8318e93cb6"
+checksum = "741e124f5485c7e60c03b043f79f320bff3527f4bbf12cf3831750dc46a0ec2c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.15",
+ "syn 2.0.28",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.96"
+version = "1.0.104"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "057d394a50403bcac12672b2b18fb387ab6d289d957dab67dd201875391e52f1"
+checksum = "076066c5f1078eac5b722a31827a8832fe108bed65dfa75e233c89f8206e976c"
 dependencies = [
  "itoa",
  "ryu",
@@ -2274,9 +2415,9 @@
 
 [[package]]
 name = "sha2"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -2296,6 +2437,13 @@
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 
 [[package]]
+name = "sink"
+version = "0.1.0"
+dependencies = [
+ "tinyvec",
+]
+
+[[package]]
 name = "slab"
 version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2340,16 +2488,41 @@
 ]
 
 [[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
+[[package]]
 name = "strsim"
 version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
-name = "subtle"
-version = "2.4.1"
+name = "strum"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+checksum = "063e6045c0e62079840579a7e47a355ae92f60eb74daaf156fb1e84ba164e63f"
+
+[[package]]
+name = "strum_macros"
+version = "0.24.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e385be0d24f186b4ce2f9982191e7101bb737312ad61c1f2f984f34bcf85d59"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "rustversion",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "subtle"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
 [[package]]
 name = "syn"
@@ -2364,9 +2537,9 @@
 
 [[package]]
 name = "syn"
-version = "2.0.15"
+version = "2.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a34fcf3e8b60f57e6a14301a2e916d323af98b0ea63c599441eec8558660c822"
+checksum = "04361975b3f5e348b2189d8dc55bc942f278b2d482a6a0365de5bdd62d351567"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2375,15 +2548,15 @@
 
 [[package]]
 name = "tempfile"
-version = "3.5.0"
+version = "3.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9fbec84f381d5795b08656e4912bec604d162bff9291d6189a78f4c8ab87998"
+checksum = "5486094ee78b2e5038a6382ed7645bc084dc2ec433426ca4c3cb61e2007b8998"
 dependencies = [
  "cfg-if",
  "fastrand",
  "redox_syscall",
  "rustix",
- "windows-sys 0.45.0",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -2411,22 +2584,22 @@
 
 [[package]]
 name = "thiserror"
-version = "1.0.40"
+version = "1.0.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "978c9a314bd8dc99be594bc3c175faaa9794be04a5a5e153caba6915336cebac"
+checksum = "611040a08a0439f8248d1990b111c95baa9c704c805fa1f62104b39655fd7f90"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.40"
+version = "1.0.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
+checksum = "090198534930841fab3a5d1bb637cde49e339654e606195f8d9c76eeb081dc96"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.15",
+ "syn 2.0.28",
 ]
 
 [[package]]
@@ -2456,11 +2629,12 @@
 
 [[package]]
 name = "tokio"
-version = "1.28.2"
+version = "1.29.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94d7b1cfd2aa4011f2de74c2c4c63665e27a71006b0a192dcd2710272e73dfa2"
+checksum = "532826ff75199d5833b9d2c5fe410f29235e25704ee5f0ef599fb51c21f4a4da"
 dependencies = [
  "autocfg",
+ "backtrace",
  "bytes",
  "libc",
  "mio",
@@ -2559,7 +2733,7 @@
  "crypto_provider_rustcrypto",
  "nom",
  "rand",
- "rstest",
+ "rstest 0.16.0",
  "ukey2_proto",
  "ukey2_rs",
 ]
@@ -2601,7 +2775,7 @@
  "log",
  "num-bigint",
  "rand",
- "rstest",
+ "rstest 0.16.0",
  "sha2",
  "ukey2_proto",
 ]
@@ -2610,7 +2784,7 @@
 name = "ukey2_shell"
 version = "0.1.0"
 dependencies = [
- "clap 4.2.7",
+ "clap 4.3.19",
  "crypto_provider_rustcrypto",
  "ukey2_connections",
  "ukey2_rs",
@@ -2624,9 +2798,9 @@
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.8"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "unicode-normalization"
@@ -2639,9 +2813,9 @@
 
 [[package]]
 name = "universal-hash"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d3160b73c9a19f7e2939a2fdad446c57c1bbbbf4d919d3213ff1267a580d8b5"
+checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
 dependencies = [
  "crypto-common",
  "subtle",
@@ -2709,9 +2883,9 @@
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.85"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b6cb788c4e39112fbe1822277ef6fb3c55cd86b95cb3d3c4c1c9597e4ac74b4"
+checksum = "7706a72ab36d8cb1f80ffbf0e071533974a60d0a308d01a5d0375bf60499a342"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
@@ -2719,24 +2893,24 @@
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.85"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35e522ed4105a9d626d885b35d62501b30d9666283a5c8be12c14a8bdafe7822"
+checksum = "5ef2b6d3c510e9625e5fe6f509ab07d66a760f0885d858736483c32ed7809abd"
 dependencies = [
  "bumpalo",
  "log",
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.15",
+ "syn 2.0.28",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-futures"
-version = "0.4.35"
+version = "0.4.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "083abe15c5d88556b77bdf7aef403625be9e327ad37c62c4e4129af740168163"
+checksum = "c02dbc21516f9f1f04f187958890d7e6026df8d16540b7ad9492bc34a67cea03"
 dependencies = [
  "cfg-if",
  "js-sys",
@@ -2746,9 +2920,9 @@
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.85"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "358a79a0cb89d21db8120cbfb91392335913e4890665b1a7981d9e956903b434"
+checksum = "dee495e55982a3bd48105a7b947fd2a9b4a8ae3010041b9e0faab3f9cd028f1d"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -2756,28 +2930,28 @@
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.85"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4783ce29f09b9d93134d41297aded3a712b7b979e9c6f28c32cb88c973a94869"
+checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.15",
+ "syn 2.0.28",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.85"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a901d592cafaa4d711bc324edfaff879ac700b19c3dfd60058d2b445be2691eb"
+checksum = "ca6ad05a4870b2bf5fe995117d3728437bd27d7cd5f06f13c17443ef369775a1"
 
 [[package]]
 name = "web-sys"
-version = "0.3.62"
+version = "0.3.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16b5f940c7edfdc6d12126d98c9ef4d1b3d470011c47c76a6581df47ad9ba721"
+checksum = "9b85cbef8c220a6abc02aefd892dfc0fc23afb1c6a426316ec33253a3877249b"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
@@ -2850,7 +3024,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
 dependencies = [
- "windows-targets 0.48.0",
+ "windows-targets 0.48.1",
 ]
 
 [[package]]
@@ -2868,7 +3042,7 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
- "windows-targets 0.48.0",
+ "windows-targets 0.48.1",
 ]
 
 [[package]]
@@ -2888,9 +3062,9 @@
 
 [[package]]
 name = "windows-targets"
-version = "0.48.0"
+version = "0.48.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b1eb6f0cd7c80c79759c929114ef071b87354ce476d9d94271031c0497adfd5"
+checksum = "05d4b17490f70499f20b9e791dcf6a299785ce8af4d709018206dc5b4953e95f"
 dependencies = [
  "windows_aarch64_gnullvm 0.48.0",
  "windows_aarch64_msvc 0.48.0",
@@ -3008,9 +3182,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabd6e16dd08033932fc3265ad4510cc2eab24656058a6dcb107ffe274abcc95"
+checksum = "ec7fae07da688e17059d5886712c933bb0520f15eff2e09cfa18e30968f4e63a"
 dependencies = [
  "curve25519-dalek",
  "rand_core 0.6.4",
@@ -3033,7 +3207,7 @@
  "aes",
  "anyhow",
  "array_ref",
- "base64 0.21.0",
+ "base64 0.21.2",
  "crypto_provider",
  "crypto_provider_default",
  "hex",
diff --git a/nearby/Cargo.toml b/nearby/Cargo.toml
index fe44353..361628a 100644
--- a/nearby/Cargo.toml
+++ b/nearby/Cargo.toml
@@ -12,34 +12,46 @@
     "crypto/crypto_provider_openssl",
     "crypto/crypto_provider_rustcrypto",
     "crypto/crypto_provider_stubs",
+    "crypto/crypto_provider_test",
     "crypto/crypto_provider_default",
     "crypto/rand_core_05_adapter",
     "presence/array_view",
+    "presence/handle_map",
     "presence/ldt",
     "presence/ldt_np_adv",
     "presence/ldt_np_jni",
     "presence/ldt_tbc",
+    "presence/np_adv",
+    "presence/np_ed25519",
+    "presence/np_ffi_core",
     "presence/np_hkdf",
     "presence/rand_ext",
+    "presence/sink",
     "presence/test_helper",
     "presence/xts_aes",
 ]
 
 # TODO: remove ldt_np_adv_ffi once support for no_std + alloc no longer requires nightly
 # TODO: remove boringssl once we figure out a better plan for integrating the build system
-exclude = ["presence/ldt_np_adv_ffi", "crypto/crypto_provider_boringssl"]
+# TODO: remove np_c_ffi once cbindgen no longer requires nightly
+exclude = [
+    "presence/ldt_np_adv_ffi",
+    "crypto/crypto_provider_boringssl",
+    "presence/np_c_ffi",
+]
 
 [workspace.dependencies]
 # local crates
 array_ref = { path = "presence/array_ref" }
 array_view = { path = "presence/array_view" }
 crypto_provider = { path = "crypto/crypto_provider" }
-crypto_provider_default = {path = "crypto/crypto_provider_default", default-features=false}
+crypto_provider_default = { path = "crypto/crypto_provider_default", default-features = false }
 crypto_provider_openssl = { path = "crypto/crypto_provider_openssl" }
 crypto_provider_rustcrypto = { path = "crypto/crypto_provider_rustcrypto" }
 crypto_provider_stubs = { path = "crypto/crypto_provider_stubs" }
 crypto_provider_test = { path = "crypto/crypto_provider_test" }
 lock_adapter = { path = "connections/ukey2/lock_adapter" }
+handle_map = { path = "presence/handle_map" }
 rand_core_05_adapter = { path = "crypto/rand_core_05_adapter" }
 rand_ext = { path = "presence/rand_ext" }
 test_helper = { path = "presence/test_helper" }
@@ -49,51 +61,65 @@
 ldt = { path = "presence/ldt" }
 ldt_np_adv = { path = "presence/ldt_np_adv" }
 ldt_tbc = { path = "presence/ldt_tbc" }
+np_adv = { path = "presence/np_adv" }
+np_ed25519 = { path = "presence/np_ed25519" }
+np_ffi_core = { path = "presence/np_ffi_core" }
+sink = { path = "presence/sink" }
 
 # from crates.io
 rand = { version = "0.8.5", default-features = false }
 rand_core = "0.6.4"
 rand_pcg = "0.3.1"
-sha2 = { version = "0.10.2", default-features = false }
+sha2 = { version = "0.10.6", default-features = false }
 aes = "0.8.2"
 cbc = { version = "0.1.2", features = ["alloc", "block-padding"] }
 ctr = "0.9.1"
+hashbrown = "0.14.0"
 hkdf = "0.12.3"
 hmac = "0.12.1"
-ed25519-dalek = { version = "2.0.0-rc.2", default-features = false }
+ed25519-dalek = { version = "2.0.0-rc.3", default-features = false }
 ed25519 = "2.2.0"
 aes-gcm = "0.10.1"
 hex = "0.4.3"
-serde_json = { version = "1.0.91", features = ["alloc"], default-features = false }
+serde_json = { version = "1.0.96", features = [
+    "alloc",
+], default-features = false }
 base64 = "0.21.0"
-x25519-dalek = { version = "2.0.0-rc.2", default-features = false }
-subtle = { version = "2.4.1", default-features = false }
+x25519-dalek = { version = "2.0.0-rc.3", default-features = false }
+subtle = { version = "2.5.0", default-features = false }
 rand_chacha = { version = "0.3.1", default-features = false }
-p256 = { version = "0.13.0", default-features = false }
-sec1 = "0.7.1"
+p256 = { version = "0.13.2", default-features = false }
+sec1 = "0.7.2"
+portable-atomic = "1.3.2"
 protobuf = "3.2.0"
 protobuf-codegen = "3.2.0"
 jni = "0.21.1"
-spin = "0.9.8"
+lock_api = "0.4.9"
+spin = { version = "0.9.8", features = ["once", "lock_api", "rwlock"] }
 anyhow = "1.0.64"
 log = "0.4.17"
 env_logger = "0.10.0"
 criterion = { version = "0.4.0", features = ["html_reports"] }
 clap = { version = "4.0.25", features = ["derive"] }
 lazy_static = { version = "1.4.0", features = ["spin_no_std"] }
-hex-literal = "0.3.4"
+hex-literal = "0.4.1"
 openssl = "0.10.48"
 cfg-if = "1.0.0"
 blake2 = "0.10.4"
 hdrhistogram = "7.5.0"
 regex = "1.7.0"
+tokio = { version = "1.20.3", features = ["full"] }
 xts-mode = "0.5.1"
-rstest = "0.16.0"
+rstest = { version = "0.17.0", default-features = false }
 rstest_reuse = "0.5.0"
 wycheproof = "0.4.0"
 chrono = { version = "0.4.24", default-features = false, features = ["clock"] }
 tempfile = "3.5.0"
 thiserror = "1.0.40"
+tinyvec = {version = "1.6.0", features = ["rustc_1_55"]}
+mlua = "0.8.8"
+strum = "0.24.1"
+strum_macros = "0.24.2"
 
 [workspace.package]
 version = "0.1.0"
@@ -109,6 +135,16 @@
 # fat vs thin: thin compiles a lot faster, and doesn't seem any slower.
 lto = "thin"
 
+# build profile optimized for size
+[profile.release-min-size]
+inherits = "release"
+panic = "abort"
+codegen-units = 1
+lto = true
+# z optimizes for size
+opt-level = "z"
+strip = true
+
 [package]
 name = "build-scripts"
 version.workspace = true
@@ -120,7 +156,10 @@
 anyhow.workspace = true
 shell-escape = "0.1.5"
 owo-colors = "3.5.0"
-reqwest = { version = "0.11.17", default-features = false, features = ["blocking", "rustls-tls"] }
+reqwest = { version = "0.11.17", default-features = false, features = [
+    "blocking",
+    "rustls-tls",
+] }
 semver = "1.0.17"
 base64.workspace = true
 walkdir = "2.3.3"
@@ -131,7 +170,7 @@
 thiserror.workspace = true
 log.workspace = true
 env_logger.workspace = true
+which = "4.4.0"
 
 [dev-dependencies]
 tempfile.workspace = true
-
diff --git a/nearby/Dockerfile b/nearby/Dockerfile
deleted file mode 100644
index cd60ac8..0000000
--- a/nearby/Dockerfile
+++ /dev/null
@@ -1,58 +0,0 @@
-# Copyright 2022 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-FROM ubuntu:22.10
-
-# install system deps
-RUN apt-get update && apt-get install -y build-essential cmake gcc wget vim \
-clang git checkinstall zlib1g-dev libjsoncpp-dev libbenchmark-dev curl \
-protobuf-compiler pkg-config libdbus-1-dev libssl-dev ninja-build
-RUN apt upgrade -y
-
-# install cargo with default settings
-RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain 1.68.1
-ENV PATH="/root/.cargo/bin:${PATH}"
-RUN cargo install --locked cargo-deny --color never 2>&1
-RUN cargo install cargo-fuzz --color never 2>&1
-# unreleased PR https://github.com/ehuss/cargo-prefetch/pull/6
-RUN cargo install cargo-prefetch \
-    --git https://github.com/marshallpierce/cargo-prefetch.git \
-    --rev f6affa68e950275f9fd773f2646ab7ee4db82897 \
-    --color never 2>&1
-# needed for generating boringssl bindings
-# Must use 0.64.0, as version >= 0.65.0 removes the option "--size_t-is-usize", an option
-# used by boringssl when generating rust bindings
-RUN cargo install bindgen-cli --version 0.64.0
-RUN rustup toolchain add nightly
-# boringssl build wants go
-RUN curl -L https://go.dev/dl/go1.20.2.linux-amd64.tar.gz | tar -C /usr/local -xz
-ENV PATH="$PATH:/usr/local/go/bin"
-
-# when the image runs build and test everything to ensure env is setup correctly
-CMD ["cargo", "run", "--", "check-everything"]
-
-# needed for boringssl git operations
-RUN git config --global user.email "docker@example.com"
-RUN git config --global user.name "NP Docker"
-
-RUN mkdir -p /google/nearby
-WORKDIR /google/nearby
-
-# prefetch dependencies so later build steps don't re-download on source changes
-COPY Cargo.toml Cargo.lock ./
-RUN cargo prefetch --lockfile Cargo.lock
-
-# copy repo into workdir of docker containter
-COPY . .
-
diff --git a/nearby/README.md b/nearby/README.md
index 85387a0..86db67d 100644
--- a/nearby/README.md
+++ b/nearby/README.md
@@ -35,7 +35,7 @@
 First install Docker then build and run the image:
 
 ```
-sudo docker build -t nearby_rust:v1.0 .
+sudo docker build -t nearby_rust:v1.0 ..
 sudo docker run --rm -it nearby_rust:v1.0
 ```
 
diff --git a/nearby/connections/ukey2/ukey2_c_ffi/cpp/CMakeLists.txt b/nearby/connections/ukey2/ukey2_c_ffi/cpp/CMakeLists.txt
index 3c6f0db..c1247eb 100644
--- a/nearby/connections/ukey2/ukey2_c_ffi/cpp/CMakeLists.txt
+++ b/nearby/connections/ukey2/ukey2_c_ffi/cpp/CMakeLists.txt
@@ -29,14 +29,19 @@
     BINARY_DIR "${CMAKE_SOURCE_DIR}/ukey2_c_ffi"
     INSTALL_COMMAND "")
 
-# GoogleTest requires at least C++14
-set(CMAKE_CXX_STANDARD 14)
-add_compile_options(-Wall -Werror -Wextra -Wimplicit-fallthrough -Wextra-semi
-        -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi
-        -Wno-unneeded-internal-declaration
-        -Wno-ignored-pragma-optimize
-        -Wno-bitfield-constant-conversion -Wno-deprecated-this-capture -Wshadow
-        -Wsign-compare)
+# required for designated initializers on MSVC
+set(CMAKE_CXX_STANDARD 20)
+
+if(UNIX)
+    add_compile_options(-Wall -Werror -Wextra -Wimplicit-fallthrough -Wextra-semi
+            -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi
+            -Wno-unneeded-internal-declaration
+            -Wno-ignored-pragma-optimize
+            -Wno-bitfield-constant-conversion -Wno-deprecated-this-capture -Wshadow
+            -Wsign-compare)
+elseif(MSVC)
+    add_compile_options(-W4 -MD)
+endif()
 
 include(FetchContent)
 FetchContent_Declare(
@@ -52,10 +57,29 @@
   ukey2_ffi.h
   ukey2_bindings.h)
 
-target_link_libraries(ffi_test
-    "${CMAKE_SOURCE_DIR}/../../../../target/release/libukey2_c_ffi${CMAKE_SHARED_LIBRARY_SUFFIX}"
-    GTest::gtest_main
-    dl pthread)
+set(ukey2_c_ffi_FILENAME "${CMAKE_SHARED_LIBRARY_PREFIX}ukey2_c_ffi${CMAKE_SHARED_LIBRARY_SUFFIX}")
+
+if(UNIX)
+    target_link_libraries(
+        ffi_test
+        "${CMAKE_SOURCE_DIR}/../../../../target/release/${ukey2_c_ffi_FILENAME}"
+        GTest::gtest_main
+        dl pthread
+    )
+elseif(MSVC)
+    # MSVC requires linking to a static lib, which rust kindly generates
+    target_link_libraries(
+        ffi_test
+        "${CMAKE_SOURCE_DIR}/../../../../target/release/${ukey2_c_ffi_FILENAME}${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        GTest::gtest_main
+    )
+    # MSVC requires that the dynamic lib be visible to the binary, and copying to the binary dir is an easy way to do that
+    get_target_property(ffi_test_BINARY_DIR ffi_test BINARY_DIR)
+    add_custom_command(
+        TARGET ffi_test POST_BUILD
+        COMMAND "${CMAKE_COMMAND}" -E copy "${CMAKE_SOURCE_DIR}/../../../../target/release/${ukey2_c_ffi_FILENAME}" "${ffi_test_BINARY_DIR}/."
+    )
+endif()
 
 include(GoogleTest)
 gtest_discover_tests(ffi_test)
diff --git a/nearby/connections/ukey2/ukey2_connections/fuzz/Cargo.lock b/nearby/connections/ukey2/ukey2_connections/fuzz/Cargo.lock
index 2e61f80..4a00416 100644
--- a/nearby/connections/ukey2/ukey2_connections/fuzz/Cargo.lock
+++ b/nearby/connections/ukey2/ukey2_connections/fuzz/Cargo.lock
@@ -4,9 +4,9 @@
 
 [[package]]
 name = "aead"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c192eb8f11fc081b0fe4259ba5af04217d4e0faddd02417310a927911abd7c8"
+checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
 dependencies = [
  "bytes",
  "crypto-common",
@@ -15,9 +15,9 @@
 
 [[package]]
 name = "aes"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433cfd6710c9986c576a25ca913c39d66a6474107b406f34f91d4a8923395241"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
 dependencies = [
  "cfg-if",
  "cipher",
@@ -41,9 +41,9 @@
 
 [[package]]
 name = "aho-corasick"
-version = "0.7.20"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+checksum = "43f6cb1bf222025340178f382c426f13757b2960e89779dfcb319c32542a5a41"
 dependencies = [
  "memchr",
 ]
@@ -56,9 +56,9 @@
 
 [[package]]
 name = "anyhow"
-version = "1.0.70"
+version = "1.0.72"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7de8ce5e0f9f8d88245311066a578d72b7af3e7088f32783804676302df237e4"
+checksum = "3b13c32d80ecc7ab747b80c3784bce54ee8a7a0cc4fbda9bf4cda2cf6fe90854"
 
 [[package]]
 name = "arbitrary"
@@ -109,18 +109,18 @@
 
 [[package]]
 name = "block-padding"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a90ec2df9600c28a01c56c4784c9207a96d2451833aeceb8cc97e4c9548bb78"
+checksum = "a8894febbff9f758034a5b8e12d87918f56dfc64a8e1fe757d65e29041538d93"
 dependencies = [
  "generic-array",
 ]
 
 [[package]]
 name = "bumpalo"
-version = "3.12.1"
+version = "3.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
+checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
 [[package]]
 name = "bytes"
@@ -160,9 +160,9 @@
 
 [[package]]
 name = "ciborium"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0c137568cc60b904a7724001b35ce2630fd00d5d84805fbb608ab89509d788f"
+checksum = "effd91f6c78e5a4ace8a5d3c0b6bfaec9e2baaef55f3efc00e45fb2e477ee926"
 dependencies = [
  "ciborium-io",
  "ciborium-ll",
@@ -171,15 +171,15 @@
 
 [[package]]
 name = "ciborium-io"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "346de753af073cc87b52b2083a506b38ac176a44cfb05497b622e27be899b369"
+checksum = "cdf919175532b369853f5d5e20b26b43112613fd6fe7aee757e35f7a44642656"
 
 [[package]]
 name = "ciborium-ll"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "213030a2b5a4e0c0892b6652260cf6ccac84827b83a85a534e178e3906c4cf1b"
+checksum = "defaa24ecc093c77630e6c15e17c51f5e187bf35ee514f4e2d67baaa96dae22b"
 dependencies = [
  "ciborium-io",
  "half",
@@ -197,9 +197,9 @@
 
 [[package]]
 name = "clap"
-version = "3.2.24"
+version = "3.2.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eef2b3ded6a26dfaec672a742c93c8cf6b689220324da509ec5caa20de55dc83"
+checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
 dependencies = [
  "bitflags",
  "clap_lex",
@@ -218,15 +218,15 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.5"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28d997bd5e24a5928dd43e46dc529867e207907fe0b239c3477d924f7f2ca320"
+checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
 dependencies = [
  "libc",
 ]
@@ -290,9 +290,9 @@
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.9.14"
+version = "0.9.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46bd5f3f85273295a9d14aedfb86f6aadbff6d8f5295c4a9edb08e819dcf5695"
+checksum = "ae211234986c545741a7dc064309f67ee1e5ad243d0e48335adc0484d960bcc7"
 dependencies = [
  "autocfg",
  "cfg-if",
@@ -303,18 +303,18 @@
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.15"
+version = "0.8.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c063cd8cc95f5c377ed0d4b49a4b21f632396ff690e8470c29b3359b346984b"
+checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
 dependencies = [
  "cfg-if",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c2538c4e68e52548bacb3e83ac549f903d44f011ac9d5abb5e132e67d0808f7"
+checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -372,23 +372,36 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-rc.2"
+version = "4.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
+checksum = "436ace70fc06e06f7f689d2624dc4e2f0ea666efb5aa704215f7249ae6e047a7"
 dependencies = [
  "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
  "digest",
  "fiat-crypto",
- "packed_simd_2",
  "platforms",
+ "rustc_version",
  "subtle",
 ]
 
 [[package]]
-name = "der"
-version = "0.7.1"
+name = "curve25519-dalek-derive"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc906908ea6458456e5eaa160a9c08543ec3d1e6f71e2235cedd660cb65f9df0"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.26",
+]
+
+[[package]]
+name = "der"
+version = "0.7.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -396,9 +409,9 @@
 
 [[package]]
 name = "derive-getters"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c5905670fd9c320154f3a4a01c9e609733cd7b753f3c58777ab7d5ce26686b3"
+checksum = "0122f262bf9c9a367829da84f808d9fb128c10ef283bbe7b0922a77cf07b2747"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -407,20 +420,20 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3cdeb9ec472d588e539a818b2dee436825730da08ad0017c4b1a17676bdc8b7"
+checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.26",
 ]
 
 [[package]]
 name = "digest"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
@@ -438,9 +451,9 @@
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "798f704d128510932661a3489b08e3f4c934a01d61c5def59ae7b8e48f19665a"
+checksum = "faa8e9049d5d72bfc12acbc05914731b5322f79b5e2f195e9f2d705fca22ab4c"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
@@ -456,9 +469,9 @@
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.2"
+version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ea5a92946e8614bb585254898bb7dd1ddad241ace60c52149e3765e34cc039d"
+checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -475,13 +488,13 @@
 
 [[package]]
 name = "errno"
-version = "0.2.8"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f639046355ee4f37944e44f60642c6f3a7efa3cf6b78c78a0d989a8ce6c396a1"
+checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a"
 dependencies = [
  "errno-dragonfly",
  "libc",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -521,9 +534,9 @@
 
 [[package]]
 name = "generic-array"
-version = "0.14.6"
+version = "0.14.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bff49e947297f3312447abdca79f45f4738097cc82b06e72054d2223f601f1b9"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
 dependencies = [
  "typenum",
  "version_check",
@@ -532,9 +545,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.8"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "libc",
@@ -575,18 +588,9 @@
 
 [[package]]
 name = "hermit-abi"
-version = "0.2.6"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee512640fe35acbfb4bb779db6f0d80704c2cacfa2e39b601ef3e3f47d1ae4c7"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "hermit-abi"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
 
 [[package]]
 name = "hkdf"
@@ -637,13 +641,13 @@
 
 [[package]]
 name = "io-lifetimes"
-version = "1.0.9"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09270fd4fa1111bc614ed2246c7ef56239a3063d5be0d1ec3b589c505d400aeb"
+checksum = "eae7b9aee968036d54dce06cebaefd919e4472e753296daccd6d344e3e2df0c2"
 dependencies = [
- "hermit-abi 0.3.1",
+ "hermit-abi 0.3.2",
  "libc",
- "windows-sys 0.45.0",
+ "windows-sys",
 ]
 
 [[package]]
@@ -657,9 +661,9 @@
 
 [[package]]
 name = "itoa"
-version = "1.0.6"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "453ad9f582a441959e5f0d088b02ce04cfe8d51a8eaf077f12ac6d3e94164ca6"
+checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "jobserver"
@@ -672,9 +676,9 @@
 
 [[package]]
 name = "js-sys"
-version = "0.3.61"
+version = "0.3.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "445dde2150c55e483f3d8416706b97ec8e8237c307e5b7b4b8dd15e6af2a0730"
+checksum = "c5f195fe497f702db0f318b07fdd68edb16955aed830df8363d837542f8f935a"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -687,9 +691,9 @@
 
 [[package]]
 name = "libc"
-version = "0.2.140"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "libfuzzer-sys"
@@ -703,25 +707,16 @@
 ]
 
 [[package]]
-name = "libm"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
-
-[[package]]
 name = "linux-raw-sys"
-version = "0.1.4"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f051f77a7c8e6957c0696eac88f26b0117e54f52d3fc682ab19397a8812846a4"
+checksum = "ef53942eb7bf7ff43a617b3e2c1c4a5ecf5944a7c1bc12d7ee39bbb15e5c1519"
 
 [[package]]
 name = "log"
-version = "0.4.17"
+version = "0.4.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
-dependencies = [
- "cfg-if",
-]
+checksum = "b06a4cde4c0f271a446782e3eff8de789548ce57dbc8eca9292c27f4a42004b4"
 
 [[package]]
 name = "memchr"
@@ -731,9 +726,9 @@
 
 [[package]]
 name = "memoffset"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d61c719bcfbcf5d62b3a09efa6088de8c54bc0bfcd3ea7ae39fcc186108b8de1"
+checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
 dependencies = [
  "autocfg",
 ]
@@ -786,19 +781,19 @@
 
 [[package]]
 name = "num_cpus"
-version = "1.15.0"
+version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fac9e2da13b5eb447a6ce3d392f23a29d8694bff781bf03a16cd9ac8697593b"
+checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi 0.2.6",
+ "hermit-abi 0.3.2",
  "libc",
 ]
 
 [[package]]
 name = "once_cell"
-version = "1.17.1"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "oorandom"
@@ -814,31 +809,21 @@
 
 [[package]]
 name = "os_str_bytes"
-version = "6.5.0"
+version = "6.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ceedf44fb00f2d1984b0bc98102627ce622e083e49a5bacdb3e514fa4238e267"
+checksum = "4d5d9eb14b174ee9aa2ef96dc2b94637a2d4b6e7cb873c7e171f0c20c6cf3eac"
 
 [[package]]
 name = "p256"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7270da3e5caa82afd3deb054cc237905853813aea3859544bc082c3fe55b8d47"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
 dependencies = [
  "elliptic-curve",
  "primeorder",
 ]
 
 [[package]]
-name = "packed_simd_2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
-dependencies = [
- "cfg-if",
- "libm",
-]
-
-[[package]]
 name = "platforms"
 version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -846,9 +831,9 @@
 
 [[package]]
 name = "plotters"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2538b639e642295546c50fcd545198c9d64ee2a38620a628724a3b266d5fbf97"
+checksum = "d2c224ba00d7cadd4d5c660deaf2098e5e80e07846537c51f9cfa4be50c1fd45"
 dependencies = [
  "num-traits",
  "plotters-backend",
@@ -859,24 +844,24 @@
 
 [[package]]
 name = "plotters-backend"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "193228616381fecdc1224c62e96946dfbc73ff4384fba576e052ff8c1bea8142"
+checksum = "9e76628b4d3a7581389a35d5b6e2139607ad7c75b17aed325f210aa91f4a9609"
 
 [[package]]
 name = "plotters-svg"
-version = "0.3.3"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9a81d2759aae1dae668f783c308bc5c8ebd191ff4184aaa1b37f65a6ae5a56f"
+checksum = "38f6d39893cca0701371e3c27294f09797214b86f1fb951b89ade8ec04e2abab"
 dependencies = [
  "plotters-backend",
 ]
 
 [[package]]
 name = "polyval"
-version = "0.6.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef234e08c11dfcb2e56f79fd70f6f2eb7f025c0ce2333e82f4f0518ecad30c6"
+checksum = "d52cff9d1d4dee5fe6d03729099f4a310a41179e0a10dbf542039873f2e826fb"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -892,18 +877,18 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7613fdcc0831c10060fa69833ea8fa2caa94b6456f51e25356a885b530a2e3d0"
+checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.56"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b63bdb0cd06f1f4dedf69b254734f9b45af66e4a031e42a7480257d9898b435"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
@@ -961,9 +946,9 @@
 
 [[package]]
 name = "quote"
-version = "1.0.26"
+version = "1.0.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
+checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
 dependencies = [
  "proc-macro2",
 ]
@@ -1022,18 +1007,30 @@
 
 [[package]]
 name = "redox_syscall"
-version = "0.2.16"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
+checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
 dependencies = [
  "bitflags",
 ]
 
 [[package]]
 name = "regex"
-version = "1.7.3"
+version = "1.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b1f693b24f6ac912f4893ef08244d70b6067480d2f1a46e950c9691e6749d1d"
+checksum = "b2eae68fc220f7cf2532e4494aded17545fce192d59cd996e0fe7887f4ceb575"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39354c10dd07468c2e73926b23bb9c2caca74c5501e38a35da70406f1d923310"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -1042,29 +1039,38 @@
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.29"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
+
+[[package]]
+name = "rustc_version"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
 
 [[package]]
 name = "rustix"
-version = "0.36.11"
+version = "0.37.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db4165c9963ab29e422d6c26fbc1d37f15bace6b2810221f9d925023480fcf0e"
+checksum = "4d69718bf81c6127a49dc64e44a742e8bb9213c0ff8869a22c308f84c1d4ab06"
 dependencies = [
  "bitflags",
  "errno",
  "io-lifetimes",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.45.0",
+ "windows-sys",
 ]
 
 [[package]]
 name = "ryu"
-version = "1.0.13"
+version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f91339c0467de62360649f8d3e185ca8de4224ff281f66000de5eb2a77a79041"
+checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
 
 [[package]]
 name = "same-file"
@@ -1077,15 +1083,15 @@
 
 [[package]]
 name = "scopeguard"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
 [[package]]
 name = "sec1"
-version = "0.7.1"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48518a2b5775ba8ca5b46596aae011caa431e6ce7e4a67ead66d92f08884220e"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
 dependencies = [
  "base16ct",
  "der",
@@ -1095,30 +1101,36 @@
 ]
 
 [[package]]
-name = "serde"
-version = "1.0.160"
+name = "semver"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb2f3770c8bce3bcda7e149193a069a0f4365bda1fa5cd88e03bca26afc1216c"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+
+[[package]]
+name = "serde"
+version = "1.0.171"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30e27d1e4fd7659406c492fd6cfaf2066ba8773de45ca75e855590f856dc34a9"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.160"
+version = "1.0.171"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "291a097c63d8497e00160b166a967a4a79c64f3facdd01cbd7502231688d77df"
+checksum = "389894603bd18c46fa56231694f8d827779c0951a667087194cf9de94ed24682"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.13",
+ "syn 2.0.26",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.96"
+version = "1.0.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "057d394a50403bcac12672b2b18fb387ab6d289d957dab67dd201875391e52f1"
+checksum = "d03b412469450d4404fe8499a268edd7f8b79fecb074b0d812ad64ca21f4031b"
 dependencies = [
  "itoa",
  "ryu",
@@ -1127,9 +1139,9 @@
 
 [[package]]
 name = "sha2"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -1144,9 +1156,9 @@
 
 [[package]]
 name = "subtle"
-version = "2.4.1"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
 [[package]]
 name = "syn"
@@ -1161,9 +1173,9 @@
 
 [[package]]
 name = "syn"
-version = "2.0.13"
+version = "2.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c9da457c5285ac1f936ebd076af6dac17a61cfe7826f2076b4d015cf47bc8ec"
+checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1172,15 +1184,16 @@
 
 [[package]]
 name = "tempfile"
-version = "3.4.0"
+version = "3.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af18f7ae1acd354b992402e9ec5864359d693cd8a79dcbef59f76891701c1e95"
+checksum = "31c0432476357e58790aaa47a8efb0c5138f137343f3b5f23bd36a27e3b0a6d6"
 dependencies = [
+ "autocfg",
  "cfg-if",
  "fastrand",
  "redox_syscall",
  "rustix",
- "windows-sys 0.42.0",
+ "windows-sys",
 ]
 
 [[package]]
@@ -1191,22 +1204,22 @@
 
 [[package]]
 name = "thiserror"
-version = "1.0.40"
+version = "1.0.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "978c9a314bd8dc99be594bc3c175faaa9794be04a5a5e153caba6915336cebac"
+checksum = "a35fc5b8971143ca348fa6df4f024d4d55264f3468c71ad1c2f365b0a4d58c42"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.40"
+version = "1.0.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
+checksum = "463fe12d7993d3b327787537ce8dd4dfa058de32fc2b195ef3cde03dc4771e8f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.13",
+ "syn 2.0.26",
 ]
 
 [[package]]
@@ -1272,15 +1285,15 @@
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.8"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "universal-hash"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d3160b73c9a19f7e2939a2fdad446c57c1bbbbf4d919d3213ff1267a580d8b5"
+checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
 dependencies = [
  "crypto-common",
  "subtle",
@@ -1310,9 +1323,9 @@
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.84"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "31f8dcbc21f30d9b8f2ea926ecb58f6b91192c17e9d33594b3df58b2007ca53b"
+checksum = "7706a72ab36d8cb1f80ffbf0e071533974a60d0a308d01a5d0375bf60499a342"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
@@ -1320,24 +1333,24 @@
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.84"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95ce90fd5bcc06af55a641a86428ee4229e44e07033963a2290a8e241607ccb9"
+checksum = "5ef2b6d3c510e9625e5fe6f509ab07d66a760f0885d858736483c32ed7809abd"
 dependencies = [
  "bumpalo",
  "log",
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.26",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.84"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c21f77c0bedc37fd5dc21f897894a5ca01e7bb159884559461862ae90c0b4c5"
+checksum = "dee495e55982a3bd48105a7b947fd2a9b4a8ae3010041b9e0faab3f9cd028f1d"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -1345,28 +1358,28 @@
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.84"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2aff81306fcac3c7515ad4e177f521b5c9a15f2b08f4e32d823066102f35a5f6"
+checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.26",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.84"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0046fef7e28c3804e5e38bfa31ea2a0f73905319b677e57ebe37e49358989b5d"
+checksum = "ca6ad05a4870b2bf5fe995117d3728437bd27d7cd5f06f13c17443ef369775a1"
 
 [[package]]
 name = "web-sys"
-version = "0.3.61"
+version = "0.3.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e33b99f4b23ba3eec1a53ac264e35a755f00e966e0065077d6027c0f575b0b97"
+checksum = "9b85cbef8c220a6abc02aefd892dfc0fc23afb1c6a426316ec33253a3877249b"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
@@ -1416,33 +1429,18 @@
 
 [[package]]
 name = "windows-sys"
-version = "0.42.0"
+version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
-dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
-]
-
-[[package]]
-name = "windows-sys"
-version = "0.45.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
  "windows-targets",
 ]
 
 [[package]]
 name = "windows-targets"
-version = "0.42.2"
+version = "0.48.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
+checksum = "05d4b17490f70499f20b9e791dcf6a299785ce8af4d709018206dc5b4953e95f"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -1455,51 +1453,51 @@
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.42.2"
+version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
+checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.42.2"
+version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
+checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.42.2"
+version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
+checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.42.2"
+version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
+checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.42.2"
+version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
+checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.42.2"
+version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
+checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.42.2"
+version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabd6e16dd08033932fc3265ad4510cc2eab24656058a6dcb107ffe274abcc95"
+checksum = "ec7fae07da688e17059d5886712c933bb0520f15eff2e09cfa18e30968f4e63a"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
@@ -1507,6 +1505,6 @@
 
 [[package]]
 name = "zeroize"
-version = "1.5.7"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c394b5bd0c6f669e7275d9c20aa90ae064cb22e75a1cad54e1b34088034b149f"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
diff --git a/nearby/crypto/crypto_provider_boringssl/Cargo.lock b/nearby/crypto/crypto_provider_boringssl/Cargo.lock
index 7d097a6..14402c1 100644
--- a/nearby/crypto/crypto_provider_boringssl/Cargo.lock
+++ b/nearby/crypto/crypto_provider_boringssl/Cargo.lock
@@ -3,12 +3,6 @@
 version = 3
 
 [[package]]
-name = "autocfg"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
-
-[[package]]
 name = "base64"
 version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -61,101 +55,6 @@
 ]
 
 [[package]]
-name = "futures"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23342abe12aba583913b2e62f22225ff9c950774065e4bfb61a19cd9770fec40"
-dependencies = [
- "futures-channel",
- "futures-core",
- "futures-executor",
- "futures-io",
- "futures-sink",
- "futures-task",
- "futures-util",
-]
-
-[[package]]
-name = "futures-channel"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "955518d47e09b25bbebc7a18df10b81f0c766eaf4c4f1cccef2fca5f2a4fb5f2"
-dependencies = [
- "futures-core",
- "futures-sink",
-]
-
-[[package]]
-name = "futures-core"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bca583b7e26f571124fe5b7561d49cb2868d79116cfa0eefce955557c6fee8c"
-
-[[package]]
-name = "futures-executor"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ccecee823288125bd88b4d7f565c9e58e41858e47ab72e8ea2d64e93624386e0"
-dependencies = [
- "futures-core",
- "futures-task",
- "futures-util",
-]
-
-[[package]]
-name = "futures-io"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fff74096e71ed47f8e023204cfd0aa1289cd54ae5430a9523be060cdb849964"
-
-[[package]]
-name = "futures-macro"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89ca545a94061b6365f2c7355b4b32bd20df3ff95f02da9329b34ccc3bd6ee72"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
-
-[[package]]
-name = "futures-sink"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f43be4fe21a13b9781a69afa4985b0f6ee0e1afab2c6f454a8cf30e2b2237b6e"
-
-[[package]]
-name = "futures-task"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76d3d132be6c0e6aa1534069c705a74a5997a356c0dc2f86a47765e5617c5b65"
-
-[[package]]
-name = "futures-timer"
-version = "3.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e64b03909df88034c26dc1547e8970b91f98bdb65165d6a4e9110d94263dbb2c"
-
-[[package]]
-name = "futures-util"
-version = "0.3.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26b01e40b772d54cf6c6d721c1d1abd0647a0106a12ecaa1c186273392a69533"
-dependencies = [
- "futures-channel",
- "futures-core",
- "futures-io",
- "futures-macro",
- "futures-sink",
- "futures-task",
- "memchr",
- "pin-project-lite",
- "pin-utils",
- "slab",
-]
-
-[[package]]
 name = "getrandom"
 version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -174,9 +73,9 @@
 
 [[package]]
 name = "hex-literal"
-version = "0.3.4"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ebdb29d2ea9ed0083cd8cece49bbd968021bd99b0849edb4a9a7ee0fdf6a4e0"
+checksum = "6fe2267d4ed49bc07b63801559be28c718ea06c4738b7a03c94df7386d2cde46"
 
 [[package]]
 name = "itoa"
@@ -200,24 +99,6 @@
 ]
 
 [[package]]
-name = "memchr"
-version = "2.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
-
-[[package]]
-name = "pin-project-lite"
-version = "0.2.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
-
-[[package]]
-name = "pin-utils"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
-
-[[package]]
 name = "ppv-lite86"
 version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -292,21 +173,19 @@
 
 [[package]]
 name = "rstest"
-version = "0.16.0"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b07f2d176c472198ec1e6551dc7da28f1c089652f66a7b722676c2238ebc0edf"
+checksum = "de1bb486a691878cd320c2f0d319ba91eeaa2e894066d8b5f8f117c000e9d962"
 dependencies = [
- "futures",
- "futures-timer",
  "rstest_macros",
  "rustc_version",
 ]
 
 [[package]]
 name = "rstest_macros"
-version = "0.16.0"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7229b505ae0706e64f37ffc54a9c163e11022a6636d58fe1f3f52018257ff9f7"
+checksum = "290ca1a1c8ca7edb7c3283bd44dc35dd54fdec6253a3912e201ba1072018fca8"
 dependencies = [
  "cfg-if",
  "proc-macro2",
@@ -381,15 +260,6 @@
 ]
 
 [[package]]
-name = "slab"
-version = "0.4.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6528351c9bc8ab22353f9d776db39a20288e8d6c37ef8cfe3317cf875eecfc2d"
-dependencies = [
- "autocfg",
-]
-
-[[package]]
 name = "syn"
 version = "1.0.109"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/nearby/crypto/crypto_provider_openssl/Cargo.toml b/nearby/crypto/crypto_provider_openssl/Cargo.toml
index ef4a009..84d4380 100644
--- a/nearby/crypto/crypto_provider_openssl/Cargo.toml
+++ b/nearby/crypto/crypto_provider_openssl/Cargo.toml
@@ -10,7 +10,7 @@
 openssl.workspace = true
 cfg-if.workspace = true
 
-ouroboros = "0.15.5"
+ouroboros = "0.17.0"
 
 [features]
 default = []
diff --git a/nearby/crypto/crypto_provider_test/fuzz/Cargo.lock b/nearby/crypto/crypto_provider_test/fuzz/Cargo.lock
index f65c18d..9e1d140 100644
--- a/nearby/crypto/crypto_provider_test/fuzz/Cargo.lock
+++ b/nearby/crypto/crypto_provider_test/fuzz/Cargo.lock
@@ -3,12 +3,6 @@
 version = 3
 
 [[package]]
-name = "Inflector"
-version = "0.11.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
-
-[[package]]
 name = "aead"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -21,9 +15,9 @@
 
 [[package]]
 name = "aes"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433cfd6710c9986c576a25ca913c39d66a6474107b406f34f91d4a8923395241"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
 dependencies = [
  "cfg-if",
  "cipher",
@@ -132,15 +126,15 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.7"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e4c1eaa2012c47becbbad2ab175484c2a84d1185b566fb2cc5b8707343dfe58"
+checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
 dependencies = [
  "libc",
 ]
@@ -245,23 +239,36 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-rc.2"
+version = "4.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
+checksum = "436ace70fc06e06f7f689d2624dc4e2f0ea666efb5aa704215f7249ae6e047a7"
 dependencies = [
  "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
  "digest",
  "fiat-crypto",
- "packed_simd_2",
  "platforms",
+ "rustc_version",
  "subtle",
 ]
 
 [[package]]
-name = "der"
-version = "0.7.5"
+name = "curve25519-dalek-derive"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "05e58dffcdcc8ee7b22f0c1f71a69243d7c2d9ad87b5a14361f2424a1565c219"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.26",
+]
+
+[[package]]
+name = "der"
+version = "0.7.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -269,20 +276,20 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3cdeb9ec472d588e539a818b2dee436825730da08ad0017c4b1a17676bdc8b7"
+checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.26",
 ]
 
 [[package]]
 name = "digest"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
@@ -300,9 +307,9 @@
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "798f704d128510932661a3489b08e3f4c934a01d61c5def59ae7b8e48f19665a"
+checksum = "faa8e9049d5d72bfc12acbc05914731b5322f79b5e2f195e9f2d705fca22ab4c"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
@@ -312,9 +319,9 @@
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.4"
+version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75c71eaa367f2e5d556414a8eea812bc62985c879748d6403edabd9cb03f16e7"
+checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -373,9 +380,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c85e1d9ab2eadba7e5040d4e09cbd6d072b76a557ad64e797c2cb9d4da21d7e4"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "libc",
@@ -394,6 +401,12 @@
 ]
 
 [[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
+[[package]]
 name = "hkdf"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -432,9 +445,9 @@
 
 [[package]]
 name = "libc"
-version = "0.2.144"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b00cc1c228a6782d0f076e7b232802e0c5689d41bb5df366f2a6b6621cfdfe1"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "libfuzzer-sys"
@@ -448,16 +461,10 @@
 ]
 
 [[package]]
-name = "libm"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
-
-[[package]]
 name = "once_cell"
-version = "1.17.1"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "opaque-debug"
@@ -467,9 +474,9 @@
 
 [[package]]
 name = "openssl"
-version = "0.10.52"
+version = "0.10.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01b8574602df80f7b85fdfc5392fa884a4e3b3f4f35402c070ab34c3d3f78d56"
+checksum = "345df152bc43501c5eb9e4654ff05f794effb78d4efe3d53abc158baddc0703d"
 dependencies = [
  "bitflags",
  "cfg-if",
@@ -488,14 +495,14 @@
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.26",
 ]
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.87"
+version = "0.9.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e17f59264b2809d77ae94f0e1ebabc434773f370d6ca667bd223ea10e06cc7e"
+checksum = "374533b0e45f3a7ced10fcaeccca020e66656bc03dac384f852e4e5a7a8104a6"
 dependencies = [
  "cc",
  "libc",
@@ -505,25 +512,26 @@
 
 [[package]]
 name = "ouroboros"
-version = "0.15.6"
+version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1358bd1558bd2a083fed428ffeda486fbfb323e698cdda7794259d592ca72db"
+checksum = "b4361ddfdd108bddc19367ba805a3a43773d8bc3e407ac30e6c364cd264dd52e"
 dependencies = [
  "aliasable",
  "ouroboros_macro",
+ "static_assertions",
 ]
 
 [[package]]
 name = "ouroboros_macro"
-version = "0.15.6"
+version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f7d21ccd03305a674437ee1248f3ab5d4b1db095cf1caf49f1713ddf61956b7"
+checksum = "2b81e113ed913910f05ef45c9344f67588fe6395f92d906eedf9ee5d54279922"
 dependencies = [
- "Inflector",
+ "heck",
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.26",
 ]
 
 [[package]]
@@ -537,16 +545,6 @@
 ]
 
 [[package]]
-name = "packed_simd_2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
-dependencies = [
- "cfg-if",
- "libm",
-]
-
-[[package]]
 name = "pkg-config"
 version = "0.3.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -560,9 +558,9 @@
 
 [[package]]
 name = "polyval"
-version = "0.6.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef234e08c11dfcb2e56f79fd70f6f2eb7f025c0ce2333e82f4f0518ecad30c6"
+checksum = "d52cff9d1d4dee5fe6d03729099f4a310a41179e0a10dbf542039873f2e826fb"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -578,9 +576,9 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.1"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf8d3875361e28f7753baefef104386e7aa47642c93023356d97fdef4003bfb5"
+checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
 dependencies = [
  "elliptic-curve",
 ]
@@ -611,18 +609,18 @@
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.56"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b63bdb0cd06f1f4dedf69b254734f9b45af66e4a031e42a7480257d9898b435"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.27"
+version = "1.0.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f4f29d145265ec1c483c7c654450edde0bfe043d3938d6972630663356d9500"
+checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
 dependencies = [
  "proc-macro2",
 ]
@@ -656,10 +654,19 @@
 ]
 
 [[package]]
-name = "sec1"
-version = "0.7.2"
+name = "rustc_version"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0aec48e813d6b90b15f0b8948af3c63483992dee44c03e9930b3eebdabe046e"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "sec1"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
 dependencies = [
  "base16ct",
  "der",
@@ -669,10 +676,16 @@
 ]
 
 [[package]]
-name = "sha2"
-version = "0.10.6"
+name = "semver"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+
+[[package]]
+name = "sha2"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -686,10 +699,16 @@
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 
 [[package]]
-name = "subtle"
-version = "2.4.1"
+name = "static_assertions"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
+[[package]]
+name = "subtle"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
 [[package]]
 name = "syn"
@@ -698,15 +717,14 @@
 checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
 dependencies = [
  "proc-macro2",
- "quote",
  "unicode-ident",
 ]
 
 [[package]]
 name = "syn"
-version = "2.0.16"
+version = "2.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6f671d4b5ffdb8eadec19c0ae67fe2639df8684bd7bc4b83d986b8db549cf01"
+checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -721,15 +739,15 @@
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.8"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "universal-hash"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d3160b73c9a19f7e2939a2fdad446c57c1bbbbf4d919d3213ff1267a580d8b5"
+checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
 dependencies = [
  "crypto-common",
  "subtle",
@@ -755,9 +773,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabd6e16dd08033932fc3265ad4510cc2eab24656058a6dcb107ffe274abcc95"
+checksum = "ec7fae07da688e17059d5886712c933bb0520f15eff2e09cfa18e30968f4e63a"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
diff --git a/nearby/presence/CMakeLists.txt b/nearby/presence/CMakeLists.txt
index 6fdeed6..2b4b66e 100644
--- a/nearby/presence/CMakeLists.txt
+++ b/nearby/presence/CMakeLists.txt
@@ -12,27 +12,72 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.14)
 
-project(ldt)
+project(NearbyProtocol)
 
-set(CMAKE_C_FLAGS_DEBUG "-g -DDEBUG")
-set(CMAKE_CXX_FLAGS_DEBUG "-g -DDEBUG")
+# required for designated initializers on MSVC
+set(CMAKE_CXX_STANDARD 17)
 
-add_compile_options(-Wall -g -O1 -Wno-deprecated -Wno-deprecated-declarations)
+# root directory of repo
+set(BETO_CORE_ROOT ${CMAKE_SOURCE_DIR}/../..)
+
+# location of external third_party dependencies
+set(THIRD_PARTY_DIR ${BETO_CORE_ROOT}/third_party)
+
+set(CMAKE_C_FLAGS_DEBUG "-DDEBUG")
+set(CMAKE_CXX_FLAGS_DEBUG "-DDEBUG")
+if (UNIX)
+    set(CMAKE_C_FLAGS_DEBUG "-g ${CMAKE_C_FLAGS_DEBUG}")
+    set(CMAKE_CXX_FLAGS_DEBUG "-g ${CMAKE_C_FLAGS_DEBUG}")
+endif ()
+
+if (UNIX)
+    add_compile_options(-Wall -Wextra -Wimplicit-fallthrough -Wextra-semi
+            -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi
+            -Wshadow
+            -Wsign-compare)
+elseif (MSVC)
+    add_compile_options(-W4 -O1)
+endif ()
 
 find_package(OpenSSL REQUIRED)
-if ( OPENSSL_FOUND )
+if (OPENSSL_FOUND)
     message(STATUS "OpenSSL Found: ${OPENSSL_VERSION}")
     message(STATUS "OpenSSL Include: ${OPENSSL_INCLUDE_DIR}")
     message(STATUS "OpenSSL Libraries: ${OPENSSL_LIBRARIES}")
-endif()
+endif ()
 
+if (ENABLE_TESTS)
+    message(STATUS "Enabling workspace wide tests")
+
+    # Setup GoogleTest
+    include(FetchContent)
+    FetchContent_Declare(
+            googletest
+            GIT_REPOSITORY https://github.com/google/googletest.git
+            GIT_TAG release-1.12.1
+    )
+    FetchContent_MakeAvailable(googletest)
+    enable_testing()
+    include(GoogleTest)
+
+    # Find GoogleBenchmark
+    find_package(benchmark REQUIRED)
+
+    # Setup jsoncpp
+    set(JSONCPP_DIR ${THIRD_PARTY_DIR}/jsoncpp)
+    include_directories(${JSONCPP_DIR})
+    add_library(
+            jsoncpp
+            ${JSONCPP_DIR}/jsoncpp.cpp
+    )
+endif ()
+
+add_subdirectory(np_cpp_ffi)
 add_subdirectory(ldt_np_c_sample)
 
 if (ENABLE_FUZZ)
     message(STATUS "Building fuzzers")
     add_subdirectory(ldt_np_adv_ffi_fuzz)
-endif()
-
-
+endif ()
diff --git a/nearby/presence/README.md b/nearby/presence/README.md
index 8f38f7d..fe63af1 100644
--- a/nearby/presence/README.md
+++ b/nearby/presence/README.md
@@ -5,17 +5,20 @@
 See the appendix below for more details on XTS and LDT.
 
 ## Project structure
-*Note all new crates follow the convention of using underscore `_` instead of hyphen `-` in crate names
+
+*Note all new crates follow the convention of using underscore `_` instead of
+hyphen `-` in crate names
 
 ### `ldt`
 
 An implementation
 of [`LDT`](https://luca-giuzzi.unibs.it/corsi/Support/papers-cryptography/1619-2007-NIST-Submission.pdf)
- which can use `xts-aes` as its tweakable block cipher.
+which can use `xts-aes` as its tweakable block cipher.
 
- ### `ldt_tbc`
+### `ldt_tbc`
 
-The Tweakable Block Cipher traits for use in LDT. These traits have implementations in the `xts_aes`
+The Tweakable Block Cipher traits for use in LDT. These traits have
+implementations in the `xts_aes`
 
 ### `ldt_np_adv`
 
@@ -24,24 +27,27 @@
 
 ### `ldt_np_adv_ffi`
 
-C API for rust library, currently exposes C/C++ clients the needed API's to use the NP specific LDT rust implementation.
-For an example of how to integrate with these API's see program in `ldt_np_c_sample`
+C API for rust library, currently exposes C/C++ clients the needed API's to use
+the NP specific LDT rust implementation.
+For an example of how to integrate with these API's see program
+in `ldt_np_c_sample`
 
 ### `ldt_np_c_sample`
 
-Sample c program which provides its own OpenSSL based AES implementation to encrypt data through the LDT rust implementation
+Sample c program which provides its own OpenSSL based AES implementation to
+encrypt data through the LDT rust implementation
 An example of how to interface with the `ldt_np_adv_ffi` API's
 
 ### `np_hkdf`
 
-The Key Derivation functions used for creating keys used by nearby presence from a key_seed
+The Key Derivation functions used for creating keys used by nearby presence from
+a key_seed
 
 ### `xts_aes`
 
 An implementation
 of [`XTS-AES`](https://luca-giuzzi.unibs.it/corsi/Support/papers-cryptography/1619-2007-NIST-Submission.pdf)
 
-
 ## Setup for MacOS local development
 
 Dependencies:
@@ -50,37 +56,51 @@
 brew install protobuf rapidjson google-benchmark
 ```
 
-We depend on OpenSSL of version at least 3.0.5 being installed on your machine to build the fuzzers, for macOS run:
+We depend on OpenSSL of version at least 3.0.5 being installed on your machine
+to build the fuzzers, for macOS run:
 
 ```
 brew install openssl@3
 ```
 
-Your build system may still be picking up an older version so you will have to symlink to the brew installed version:
+Your build system may still be picking up an older version so you will have to
+symlink to the brew installed version:
+
 ```
 brew link --force openssl
 ```
 
-The in-box version of Clang which comes from XCode developer tools does not have a fuzzer runtime so we will have to use our own
+The in-box version of Clang which comes from XCode developer tools does not have
+a fuzzer runtime so we will have to use our own
+
 ```
 brew install llvm
 ```
-then to override the default version it needs to come before it in $PATH. first find your path:
+
+then to override the default version it needs to come before it in $PATH. first
+find your path:
+
 ```
 $(brew --prefix llvm)/bin
 ```
+
 then add this to the beginning of your path
+
 ```
 echo 'export PATH="/opt/homebrew/opt/llvm/bin:$PATH"' >> ~/.bash_profile
 export PATH="/opt/homebrew/opt/llvm/bin:$PATH"
 ```
+
 verify success with:
+
 ```
 clang --version
 ```
+
 it should display the path to the homebrew version and not the xcode version.
 
 Some other dependencies you may need include:
+
 ```
 brew install ninja bindgen
 ```
@@ -117,7 +137,9 @@
 ```
 
 ### `ldt_np_c_sample`
-From the root directory run the following commands to build and run the C sample.
+
+From the root directory run the following commands to build and run the C
+sample.
 
 ```
 mkdir -p cmake-build && cd cmake-build
@@ -127,7 +149,9 @@
 ```
 
 ### `ldt_np_c_sample/tests`
-Test cases for the ldt_np_adv_ffi C API which are built alongside the sample, use the following commands to run the tests, from root of repo:
+
+Test cases for the ldt_np_adv_ffi C API which are built alongside the sample,
+use the following commands to run the tests, from root of repo:
 
 ```
 mkdir -p cmake-build && cd cmake-build
@@ -135,7 +159,9 @@
 make
 cd ldt_np_c_sample/tests && ctest
 ```
-you can then view the output of the tests in `ldt_np_c_sample/tests/Testing/Temporary/LastTest.log`
+
+you can then view the output of the tests
+in `ldt_np_c_sample/tests/Testing/Temporary/LastTest.log`
 
 To run the benchmarks:
 
@@ -155,7 +181,15 @@
 
 ### C
 
-Build w/ cmake as per `ldt_np_c_sample` instructions. Fuzzers will be in `np_ffi_fuzz` in the build directory.
+Build cmake project with `-DENABLE_FUZZ=true`<br>
+Fuzz targets will be output to the build dir for:<br>
+
+- `ldt_np_adv_ffi_fuzz`<br>
+- `np_cpp_ffi/fuzz`
+    - To run `fuzzer_np_cpp_deserialize`
+      use: `./fuzzer_np_cpp_deserialize -max_len=255 corpus`
+    - The `corpus` directory provides seed data to help the fuzzer generate
+      more relevant data to input
 
 ## Cross-compilation for Android
 
@@ -198,15 +232,20 @@
 - In your `adb shell`, run the benchmark
 
     - `./ldt_scan-... --bench`
+
 ### Building min-sized release cross-compiled for Android
-- Copy and paste the following into your `~/.cargo/config.toml`, replacing with a path to your NDK and Host OS
+
+- Copy and paste the following into your `~/.cargo/config.toml`, replacing with
+  a path to your NDK and Host OS
+
 ```
 [target.aarch64-linux-android]
 # Replace this with a path to your ndk version and the prebuilt toolchain for your Host OS
 linker = "Library/Android/sdk/ndk/23.2.8568313/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android21-clang"
 ```
+
 - then run:
-`cargo +nightly build -Z build-std=core,alloc -Z build-std-features=panic_immediate_abort --target aarch64-linux-android --profile release-min-size`
+  `cargo +nightly build -Z build-std=core,alloc -Z build-std-features=panic_immediate_abort --target aarch64-linux-android --profile release-min-size`
 
 ## Appendix
 
diff --git a/nearby/presence/array_view/src/lib.rs b/nearby/presence/array_view/src/lib.rs
index 9ba21b1..c57e959 100644
--- a/nearby/presence/array_view/src/lib.rs
+++ b/nearby/presence/array_view/src/lib.rs
@@ -45,6 +45,10 @@
 }
 
 impl<T, const N: usize> ArrayView<T, N> {
+    /// Destructures this ArrayView into a (length, payload) pair.
+    pub fn into_raw_parts(self) -> (usize, [T; N]) {
+        (self.len, self.array)
+    }
     /// A version of [`ArrayView#try_from_array`] which panics if `len > buffer.len()`,
     /// suitable for usage in `const` contexts.
     pub const fn const_from_array(array: [T; N], len: usize) -> ArrayView<T, N> {
diff --git a/nearby/presence/handle_map/Cargo.toml b/nearby/presence/handle_map/Cargo.toml
new file mode 100644
index 0000000..8f00bf7
--- /dev/null
+++ b/nearby/presence/handle_map/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "handle_map"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+hashbrown.workspace = true
+lock_api.workspace = true
+portable-atomic.workspace = true
+spin.workspace = true
+crypto_provider.workspace = true
+
+[dev-dependencies]
+criterion.workspace = true
+
+[[bench]]
+name = "benches"
+harness = false
diff --git a/nearby/presence/handle_map/benches/benches.rs b/nearby/presence/handle_map/benches/benches.rs
new file mode 100644
index 0000000..f1ee427
--- /dev/null
+++ b/nearby/presence/handle_map/benches/benches.rs
@@ -0,0 +1,330 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use handle_map::*;
+use std::sync::Arc;
+use std::thread;
+use std::time::{Duration, Instant};
+
+// For the sake of these benchmarks, we just want
+// to be able to allocate an almost-arbitrary number of handles
+// if needed by the particular benchmark.
+const MAX_ACTIVE_HANDLES: u32 = u32::MAX - 1;
+
+// The default number of threads+shards to use
+// in multi-threaded benchmarks, chosen
+// to represent a typical multi-threaded use-case.
+const DEFAULT_SHARDS_AND_THREADS: u8 = 8;
+
+/// We're using u8's for the wrapped object type to deliberately ignore
+/// costs related to accessing the underlying data - we just care about
+/// benchmarking handle-map operations.
+type BenchHandleMap = HandleMap<u8>;
+
+fn build_handle_map(num_shards: u8) -> BenchHandleMap {
+    let dimensions = HandleMapDimensions { num_shards, max_active_handles: MAX_ACTIVE_HANDLES };
+    HandleMap::with_dimensions(dimensions)
+}
+
+/// Benchmark for repeated reads on a single thread
+fn single_threaded_read_benchmark(c: &mut Criterion) {
+    // The number of shards should not matter much here.
+    let handle_map = build_handle_map(8);
+    // Pre-populate the map with a single handle.
+    let handle = handle_map.allocate(|| 0xFF).unwrap();
+    let handle_map_ref = &handle_map;
+    // Perform repeated reads
+    c.bench_function("single-threaded reads", |b| {
+        b.iter(|| {
+            let guard = handle_map_ref.get(black_box(handle)).unwrap();
+            black_box(*guard)
+        })
+    });
+}
+
+/// Benchmark for repeated writes on a single thread
+fn single_threaded_write_benchmark(c: &mut Criterion) {
+    // The number of shards should not matter much here.
+    let handle_map = build_handle_map(8);
+    // Pre-populate the map with a single handle.
+    let handle = handle_map.allocate(|| 0xFF).unwrap();
+    let handle_map_ref = &handle_map;
+    // Perform repeated writes
+    c.bench_function("single-threaded writes", |b| {
+        b.iter(|| {
+            let mut guard = handle_map_ref.get_mut(black_box(handle)).unwrap();
+            *guard *= black_box(0);
+        })
+    });
+}
+
+/// Benchmark for repeated allocations on a single thread
+#[allow(unused_must_use)]
+fn single_threaded_allocate_benchmark(c: &mut Criterion) {
+    // The number of shards here is chosen to be quasi-reasonable.
+    // Realistically, performance will fluctuate somewhat with this
+    // due to the difference in the number of internal hash-map collisions,
+    // but ultimately we only care about the asymptotic behavior.
+    let handle_map = build_handle_map(8);
+    let handle_map_ref = &handle_map;
+    // Perform repeated allocations
+    c.bench_function("single-threaded allocations", |b| {
+        b.iter(|| {
+            handle_map_ref.allocate(|| black_box(0xEE));
+        })
+    });
+}
+
+/// Benchmark for repeated allocation->deallocation on a single thread
+/// starting from an empty map.
+#[allow(unused_must_use)]
+fn single_threaded_allocate_deallocate_near_empty_benchmark(c: &mut Criterion) {
+    // The number of shards should not matter much here.
+    let handle_map = build_handle_map(8);
+    let handle_map_ref = &handle_map;
+    // Perform repeated allocation/deallocation pairs
+    c.bench_function("single-threaded allocate/deallocate pairs (empty init state)", |b| {
+        b.iter(|| {
+            let handle = handle_map_ref.allocate(|| black_box(0xDD)).unwrap();
+            handle_map_ref.deallocate(handle);
+        })
+    });
+}
+
+/// Benchmark for repeated allocation->deallocation starting
+/// from a map with a thousand elements per shard.
+#[allow(unused_must_use)]
+fn single_threaded_allocate_deallocate_one_thousand_benchmark(c: &mut Criterion) {
+    let handle_map = build_handle_map(8);
+    for _ in 0..(8 * 1000) {
+        handle_map.allocate(|| black_box(0xFF)).unwrap();
+    }
+    let handle_map_ref = &handle_map;
+
+    // Perform repeated allocation/deallocation pairs
+    c.bench_function(
+        "single-threaded allocate/deallocate pairs (init one thousand elements per shard)",
+        |b| {
+            b.iter(|| {
+                let handle = handle_map_ref.allocate(|| black_box(0xDD)).unwrap();
+                handle_map_ref.deallocate(handle);
+            })
+        },
+    );
+}
+
+/// Benchmark for repeated allocation->deallocation starting
+/// from a map with a million elements per shard.
+#[allow(unused_must_use)]
+fn single_threaded_allocate_deallocate_one_million_benchmark(c: &mut Criterion) {
+    let handle_map = build_handle_map(8);
+    for _ in 0..(8 * 1000000) {
+        handle_map.allocate(|| black_box(0xFF)).unwrap();
+    }
+    let handle_map_ref = &handle_map;
+
+    // Perform repeated allocation/deallocation pairs
+    c.bench_function(
+        "single-threaded allocate/deallocate pairs (init one million elements per shard)",
+        |b| {
+            b.iter(|| {
+                let handle = handle_map_ref.allocate(|| black_box(0xDD)).unwrap();
+                handle_map_ref.deallocate(handle);
+            })
+        },
+    );
+}
+
+/// Helper function for creating a multi-threaded benchmark
+/// with the set number of threads. Untimed Initialization of state
+/// should occur prior to this call. This method will repeatedly
+/// execute the benchmark code on all threads
+fn bench_multithreaded<F>(name: &str, num_threads: u8, benchable_fn_ref: Arc<F>, c: &mut Criterion)
+where
+    F: Fn() + Send + Sync + 'static,
+{
+    c.bench_function(name, move |b| {
+        b.iter_custom(|iters| {
+            // The returned results from the threads will be their timings
+            let mut join_handles = Vec::new();
+            for _ in 0..num_threads {
+                let benchable_fn_ref_clone = benchable_fn_ref.clone();
+                let join_handle = thread::spawn(move || {
+                    let start = Instant::now();
+                    for _ in 0..iters {
+                        benchable_fn_ref_clone();
+                    }
+                    start.elapsed()
+                });
+                join_handles.push(join_handle);
+            }
+            //Threads spawned, now collect the results
+            let mut total_duration = Duration::from_nanos(0);
+            for join_handle in join_handles {
+                let thread_duration = join_handle.join().unwrap();
+                total_duration += thread_duration;
+            }
+            total_duration /= num_threads as u32;
+            total_duration
+        })
+    });
+}
+
+/// Defines a number of reads/writes to perform [relative
+/// to other operations performed in a given test]
+#[derive(Debug, Clone, Copy)]
+struct ReadWriteCount {
+    num_reads: usize,
+    num_writes: usize,
+}
+
+const READS_ONLY: ReadWriteCount = ReadWriteCount { num_reads: 4, num_writes: 0 };
+
+const READ_LEANING: ReadWriteCount = ReadWriteCount { num_reads: 3, num_writes: 1 };
+
+const BALANCED: ReadWriteCount = ReadWriteCount { num_reads: 2, num_writes: 2 };
+
+const WRITE_LEANING: ReadWriteCount = ReadWriteCount { num_reads: 1, num_writes: 3 };
+
+const WRITES_ONLY: ReadWriteCount = ReadWriteCount { num_reads: 0, num_writes: 4 };
+
+const READ_WRITE_COUNTS: [ReadWriteCount; 5] =
+    [READS_ONLY, READ_LEANING, BALANCED, WRITE_LEANING, WRITES_ONLY];
+
+/// Benchmarks a repeated allocate/[X writes]/[Y reads]/deallocate workflow across
+/// the default number of threads and shards.
+fn lifecycle_read_and_write_multithreaded(per_object_rw_count: ReadWriteCount, c: &mut Criterion) {
+    let name = format!(
+        "lifecycle_read_and_write_multithreaded(reads/object: {}, writes/object:{})",
+        per_object_rw_count.num_reads, per_object_rw_count.num_writes
+    );
+    // We need an Arc to be able to pass this off to `bench_multithreaded`.
+    let handle_map = Arc::new(build_handle_map(DEFAULT_SHARDS_AND_THREADS));
+    bench_multithreaded(
+        &name,
+        DEFAULT_SHARDS_AND_THREADS,
+        Arc::new(move || {
+            let handle = handle_map.allocate(|| black_box(0xFF)).unwrap();
+            for _ in 0..per_object_rw_count.num_writes {
+                let mut write_guard = handle_map.get_mut(handle).unwrap();
+                *write_guard *= black_box(1);
+            }
+            for _ in 0..per_object_rw_count.num_reads {
+                let read_guard = handle_map.get_mut(handle).unwrap();
+                black_box(*read_guard);
+            }
+            handle_map.deallocate(handle).unwrap();
+        }),
+        c,
+    );
+}
+
+fn lifecycle_benchmarks(c: &mut Criterion) {
+    for read_write_count in READ_WRITE_COUNTS {
+        // Using 8 separate shards to roughly match the number of active threads.
+        lifecycle_read_and_write_multithreaded(read_write_count, c);
+    }
+}
+
+/// Benchmarks repeated cycles of accessing the given number of distinct objects, each
+/// with the given number of reads and writes across the given number of threads.
+fn read_and_write_contention_multithreaded(
+    num_threads: u8,
+    num_distinct_objects: u32,
+    per_object_rw_count: ReadWriteCount,
+    c: &mut Criterion,
+) {
+    let name = format!("read_and_write_contention_multithreaded(threads: {}, objects: {}, reads/object: {}, writes/object:{})",
+                       num_threads, num_distinct_objects, per_object_rw_count.num_reads, per_object_rw_count.num_writes);
+    // Default to 8 shards, ultimately doesn't matter much since we only ever access a few shards.
+    // This needs to be `'static` in order to pass a ref off to `bench_multithreaded`.
+    let handle_map = Arc::new(build_handle_map(8));
+    let mut handles = Vec::new();
+    for i in 0..num_distinct_objects {
+        let handle = handle_map.allocate(|| i as u8).unwrap();
+        handles.push(handle);
+    }
+
+    bench_multithreaded(
+        &name,
+        num_threads,
+        Arc::new(move || {
+            // Deliberately performing all writes first, with
+            // the goal of getting staggered timings from
+            // all of the threads for subsequent iterations.
+            // We also perform reads and writes across all objects
+            // in batches to get something resembling uniform access.
+            for _ in 0..per_object_rw_count.num_writes {
+                for handle in handles.iter() {
+                    let mut write_guard = handle_map.get_mut(*handle).unwrap();
+                    *write_guard *= black_box(1);
+                }
+            }
+            for _ in 0..per_object_rw_count.num_reads {
+                for handle in handles.iter() {
+                    let read_guard = handle_map.get(*handle).unwrap();
+                    black_box(*read_guard);
+                }
+            }
+        }),
+        c,
+    );
+}
+
+fn read_write_contention_benchmarks(c: &mut Criterion) {
+    for num_threads in [2, 4, 8].iter() {
+        for num_distinct_objects in [1u32, 2u32, 4u32].iter() {
+            if num_distinct_objects >= &(*num_threads as u32) {
+                continue;
+            }
+            for read_write_count in READ_WRITE_COUNTS {
+                read_and_write_contention_multithreaded(
+                    *num_threads,
+                    *num_distinct_objects,
+                    read_write_count,
+                    c,
+                );
+            }
+        }
+    }
+}
+
+/// Benchmarks allocation (starting from empty) for the default number of shards and threads
+fn allocator_contention_benchmark(c: &mut Criterion) {
+    let name = "allocator_contention_multithreaded";
+    // We need an Arc to pass this off to `bench_multithreaded`
+    let handle_map = Arc::new(build_handle_map(DEFAULT_SHARDS_AND_THREADS));
+    bench_multithreaded(
+        name,
+        DEFAULT_SHARDS_AND_THREADS,
+        Arc::new(move || {
+            handle_map.allocate(|| black_box(0xFF)).unwrap();
+        }),
+        c,
+    );
+}
+
+criterion_group!(
+    benches,
+    single_threaded_read_benchmark,
+    single_threaded_write_benchmark,
+    single_threaded_allocate_benchmark,
+    single_threaded_allocate_deallocate_near_empty_benchmark,
+    single_threaded_allocate_deallocate_one_thousand_benchmark,
+    single_threaded_allocate_deallocate_one_million_benchmark,
+    lifecycle_benchmarks,
+    read_write_contention_benchmarks,
+    allocator_contention_benchmark,
+);
+criterion_main!(benches);
diff --git a/nearby/presence/handle_map/src/lib.rs b/nearby/presence/handle_map/src/lib.rs
new file mode 100644
index 0000000..745aec4
--- /dev/null
+++ b/nearby/presence/handle_map/src/lib.rs
@@ -0,0 +1,608 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! A thread-safe implementation of a map for managing object handles,
+//! a safer alternative to raw pointers for FFI interop.
+#![cfg_attr(not(test), no_std)]
+#![forbid(unsafe_code)]
+#![deny(missing_docs)]
+extern crate alloc;
+extern crate core;
+
+use alloc::boxed::Box;
+use alloc::vec::Vec;
+use core::ops::{Deref, DerefMut};
+use core::sync::atomic::Ordering;
+use hashbrown::hash_map::EntryRef;
+use portable_atomic::{AtomicU32, AtomicU64};
+use spin::lock_api::*;
+
+#[cfg(test)]
+mod tests;
+
+/// A RAII read lock guard for an object in a [`HandleMap`]
+/// pointed-to by a given [`Handle`]. When this struct is
+/// dropped, the underlying read lock on the associated
+/// shard will be dropped.
+pub struct ObjectReadGuard<'a, T> {
+    guard: lock_api::MappedRwLockReadGuard<'a, spin::RwLock<()>, T>,
+}
+
+impl<'a, T> Deref for ObjectReadGuard<'a, T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        self.guard.deref()
+    }
+}
+
+/// A RAII read-write lock guard for an object in a [`HandleMap`]
+/// pointed-to by a given [`Handle`]. When this struct is
+/// dropped, the underlying read-write lock on the associated
+/// shard will be dropped.
+pub struct ObjectReadWriteGuard<'a, T> {
+    guard: lock_api::MappedRwLockWriteGuard<'a, spin::RwLock<()>, T>,
+}
+
+impl<'a, T> Deref for ObjectReadWriteGuard<'a, T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        self.guard.deref()
+    }
+}
+
+impl<'a, T> DerefMut for ObjectReadWriteGuard<'a, T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        self.guard.deref_mut()
+    }
+}
+
+/// FFI-transmissible structure expressing the dimensions
+/// (max # of allocatable slots, number of shards) of a handle-map
+/// to be used upon initialization.
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub struct HandleMapDimensions {
+    /// The number of shards which are employed
+    /// by the associated handle-map.
+    pub num_shards: u8,
+    /// The maximum number of active handles which may be
+    /// stored within the associated handle-map.
+    pub max_active_handles: u32,
+}
+
+/// Trait for marker structs containing information about a
+/// given [`SingletonHandleMap`], including the underlying
+/// object type and the dimensions of the map.
+/// Used primarily to enforce type-level constraints
+/// on `SingletoneHandleMap`s, including
+/// ensuring that they are truly singletons.
+pub trait SingletonHandleMapInfo {
+    /// The underlying kind of object pointed-to by handles
+    /// derived from the associated handle-map.
+    type Object: Send + Sync;
+
+    /// Gets the dimensions of the corresponding handle-map.
+    fn dimensions(&self) -> HandleMapDimensions;
+
+    /// Gets a static reference to the global handle-map
+    fn get_handle_map() -> &'static HandleMap<Self::Object>;
+}
+
+/// An individual handle to be given out by a [`HandleMap`].
+/// This representation is untyped, and just a wrapper
+/// around a handle-id, in contrast to implementors of `HandleLike`.
+#[derive(Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Handle {
+    handle_id: u64,
+}
+
+impl From<&Handle> for Handle {
+    fn from(handle: &Handle) -> Self {
+        *handle
+    }
+}
+
+impl Handle {
+    /// Constructs a handle wrapping the given ID.
+    ///
+    /// No validity checks are done on the wrapped ID
+    /// to ensure that the given ID is active in
+    /// any specific handle-map, and the type
+    /// of the handle is not represented.
+    ///
+    /// As a result, this method is only useful for
+    /// allowing access to handles from an FFI layer.
+    pub fn from_id(handle_id: u64) -> Self {
+        Self { handle_id }
+    }
+    /// Gets the ID for this handle.
+    ///
+    /// Since the underlying handle is un-typed,`
+    /// this method is only suitable for
+    /// transmitting handles across an FFI layer.
+    pub fn get_id(&self) -> u64 {
+        self.handle_id
+    }
+    /// Derives the shard index from the handle id
+    fn get_shard_index(&self, num_shards: u8) -> usize {
+        (self.handle_id % (num_shards as u64)) as usize
+    }
+}
+
+/// Error raised when attempting to allocate into a full handle-map.
+#[derive(Debug)]
+pub struct HandleMapFullError;
+
+/// Internal error enum for failed allocations into a given shard.
+enum ShardAllocationError<T, F: FnOnce() -> T> {
+    /// Error for when the entry for the handle is occupied,
+    /// in which case we spit out the object-provider to try again
+    /// with a new handle-id.
+    EntryOccupied(F),
+    /// Error for when we would exceed the maximum number of allocations.
+    ExceedsAllocationLimit,
+}
+
+/// Error raised when the entry for a given [`Handle`] doesn't exist.
+#[derive(Debug)]
+pub struct HandleNotPresentError;
+
+/// Wrapper around a `HandleMap` which is specifically tailored for maintaining
+/// a global singleton `'static` reference to a handle-map.
+/// The wrapper handles initialization of the singleton in a const-context
+/// and subsequent accesses to ensure that the underlying map is always
+/// initialized upon attempts to access it.
+pub struct SingletonHandleMap<I: SingletonHandleMapInfo> {
+    info: I,
+    wrapped: spin::once::Once<HandleMap<I::Object>, spin::relax::Spin>,
+}
+
+impl<I: SingletonHandleMapInfo> SingletonHandleMap<I> {
+    /// Constructs a new global handle-map using the given
+    /// singleton handle-map info. This method is callable
+    /// from a `const`-context to allow it to be used to initialize
+    /// `static` variables.
+    pub const fn with_info(info: I) -> Self {
+        Self { info, wrapped: spin::once::Once::new() }
+    }
+    /// Initialize the handle-map if it's not already initialized,
+    /// and return a reference to the result.
+    pub fn get(&self) -> &HandleMap<I::Object> {
+        self.wrapped.call_once(|| {
+            let dimensions = self.info.dimensions();
+            HandleMap::with_dimensions(dimensions)
+        })
+    }
+}
+
+/// A thread-safe mapping from "handle"s [like pointers, but safer]
+/// to underlying structures, supporting allocations, reads, writes,
+/// and deallocations of objects behind handles.
+pub struct HandleMap<T: Send + Sync> {
+    /// The dimensions of this handle-map
+    dimensions: HandleMapDimensions,
+
+    /// The individually-lockable "shards" of the handle-map,
+    /// among which the keys will be roughly uniformly-distributed.
+    handle_map_shards: Box<[HandleMapShard<T>]>,
+
+    /// An atomically-incrementing counter which tracks the
+    /// next handle ID which allocations will attempt to use.
+    new_handle_id_counter: AtomicU64,
+
+    /// An atomic integer roughly tracking the number of
+    /// currently-outstanding allocated entries in this
+    /// handle-map among all [`HandleMapShard`]s.
+    outstanding_allocations_counter: AtomicU32,
+}
+
+impl<T: Send + Sync> HandleMap<T> {
+    /// Creates a new handle-map with the given `HandleMapDimensions`.
+    pub fn with_dimensions(dimensions: HandleMapDimensions) -> Self {
+        let mut handle_map_shards = Vec::with_capacity(dimensions.num_shards as usize);
+        for _ in 0..dimensions.num_shards {
+            handle_map_shards.push(HandleMapShard::default());
+        }
+        let handle_map_shards = handle_map_shards.into_boxed_slice();
+        Self {
+            dimensions,
+            handle_map_shards,
+            new_handle_id_counter: AtomicU64::new(0),
+            outstanding_allocations_counter: AtomicU32::new(0),
+        }
+    }
+}
+
+impl<T: Send + Sync> HandleMap<T> {
+    /// Allocates a new object within the given handle-map, returning
+    /// a handle to the location it was stored at. This operation
+    /// may fail if attempting to allocate over the `dimensions.max_active_handles`
+    /// limit imposed on the handle-map, in which case this method
+    /// will return a `HandleMapFullError`.
+    pub fn allocate(
+        &self,
+        initial_value_provider: impl FnOnce() -> T,
+    ) -> Result<Handle, HandleMapFullError> {
+        let mut initial_value_provider = initial_value_provider;
+        loop {
+            // Increment the new-handle-ID counter using relaxed memory ordering,
+            // since the only invariant that we want to enforce is that concurrently-running
+            // threads always get distinct new handle-ids.
+            let new_handle_id = self.new_handle_id_counter.fetch_add(1, Ordering::Relaxed);
+            let new_handle = Handle::from_id(new_handle_id);
+            let shard_index = new_handle.get_shard_index(self.dimensions.num_shards);
+
+            // Now, check the shard to see if we can actually allocate into it.
+            let shard_allocate_result = self.handle_map_shards[shard_index].try_allocate(
+                new_handle,
+                initial_value_provider,
+                &self.outstanding_allocations_counter,
+                self.dimensions.max_active_handles,
+            );
+            match shard_allocate_result {
+                Ok(_) => {
+                    return Ok(new_handle);
+                }
+                Err(ShardAllocationError::ExceedsAllocationLimit) => {
+                    return Err(HandleMapFullError);
+                }
+                Err(ShardAllocationError::EntryOccupied(thrown_back_provider)) => {
+                    // We need to do the whole thing again with a new ID
+                    initial_value_provider = thrown_back_provider;
+                }
+            }
+        }
+    }
+
+    /// Gets a read-only reference to an object within the given handle-map,
+    /// if the given handle is present. Otherwise, returns [`HandleNotPresentError`].
+    pub fn get(&self, handle: Handle) -> Result<ObjectReadGuard<T>, HandleNotPresentError> {
+        let shard_index = handle.get_shard_index(self.dimensions.num_shards);
+        self.handle_map_shards[shard_index].get(handle)
+    }
+
+    /// Gets a read+write reference to an object within the given handle-map,
+    /// if the given handle is present. Otherwise, returns [`HandleNotPresentError`].
+    pub fn get_mut(
+        &self,
+        handle: Handle,
+    ) -> Result<ObjectReadWriteGuard<T>, HandleNotPresentError> {
+        let shard_index = handle.get_shard_index(self.dimensions.num_shards);
+        self.handle_map_shards[shard_index].get_mut(handle)
+    }
+
+    /// Removes the object pointed to by the given handle in
+    /// the handle-map, returning the removed object if it
+    /// exists. Otherwise, returns [`HandleNotPresentError`].
+    pub fn deallocate(&self, handle: Handle) -> Result<T, HandleNotPresentError> {
+        let shard_index = handle.get_shard_index(self.dimensions.num_shards);
+        self.handle_map_shards[shard_index]
+            .deallocate(handle, &self.outstanding_allocations_counter)
+    }
+
+    /// Gets the actual number of elements stored in the entire map.
+    /// Only suitable for single-threaded sections of tests.
+    #[cfg(test)]
+    pub(crate) fn len(&self) -> usize {
+        self.handle_map_shards.iter().map(|s| s.len()).sum()
+    }
+
+    /// Sets the new-handle-id counter to the given value.
+    /// Only suitable for tests.
+    #[cfg(test)]
+    pub(crate) fn set_new_handle_id_counter(&mut self, value: u64) {
+        self.new_handle_id_counter = AtomicU64::new(value);
+    }
+}
+
+// Bunch o' type aliases to make talking about them much easier in the shard code.
+type ShardMapType<T> = hashbrown::HashMap<Handle, T>;
+type ShardReadWriteLock<T> = RwLock<ShardMapType<T>>;
+type ShardReadGuard<'a, T> = RwLockReadGuard<'a, ShardMapType<T>>;
+type ShardUpgradableReadGuard<'a, T> = RwLockUpgradableReadGuard<'a, ShardMapType<T>>;
+type ShardReadWriteGuard<'a, T> = RwLockWriteGuard<'a, ShardMapType<T>>;
+
+/// An individual handle-map shard, which is ultimately
+/// just a hash-map behind a lock.
+pub(crate) struct HandleMapShard<T: Send + Sync> {
+    data: RwLock<ShardMapType<T>>,
+}
+
+impl<T: Send + Sync> Default for HandleMapShard<T> {
+    fn default() -> Self {
+        Self { data: RwLock::new(hashbrown::HashMap::new()) }
+    }
+}
+
+impl<T: Send + Sync> HandleMapShard<T> {
+    fn get(&self, handle: Handle) -> Result<ObjectReadGuard<T>, HandleNotPresentError> {
+        let map_read_guard = ShardReadWriteLock::<T>::read(&self.data);
+        let read_only_map_ref = map_read_guard.deref();
+        if read_only_map_ref.contains_key(&handle) {
+            let object_read_guard = ShardReadGuard::<T>::map(map_read_guard, move |map_ref| {
+                // We know that the entry exists, since we've locked the
+                // shard and already checked that it exists prior to
+                // handing out this new, mapped read-lock.
+                map_ref.get(&handle).unwrap()
+            });
+            Ok(ObjectReadGuard { guard: object_read_guard })
+        } else {
+            // Auto-drop the read guard, and return an error
+            Err(HandleNotPresentError)
+        }
+    }
+    /// Gets a read-write guard on the entire shard map if an entry for the given
+    /// handle exists, but if not, yield [`HandleNotPresentError`].
+    fn get_read_write_guard_if_entry_exists(
+        &self,
+        handle: Handle,
+    ) -> Result<ShardReadWriteGuard<T>, HandleNotPresentError> {
+        // Start with an upgradable read lock and then upgrade to a write lock.
+        // By doing this, we prevent new readers from entering (see `spin` documentation)
+        let map_upgradable_read_guard = ShardReadWriteLock::<T>::upgradable_read(&self.data);
+        let read_only_map_ref = map_upgradable_read_guard.deref();
+        if read_only_map_ref.contains_key(&handle) {
+            // If we know that the entry exists, and we're currently
+            // holding a read-lock, we know that we're safe to request
+            // an upgrade to a write lock, since only one write or
+            // upgradable read lock can be outstanding at any one time.
+            let map_read_write_guard =
+                ShardUpgradableReadGuard::<T>::upgrade(map_upgradable_read_guard);
+            Ok(map_read_write_guard)
+        } else {
+            // Auto-drop the read guard, we don't need to allow a write.
+            Err(HandleNotPresentError)
+        }
+    }
+
+    fn get_mut(&self, handle: Handle) -> Result<ObjectReadWriteGuard<T>, HandleNotPresentError> {
+        let map_read_write_guard = self.get_read_write_guard_if_entry_exists(handle)?;
+        // Expose only the pointed-to object with a mapped read-write guard
+        let object_read_write_guard =
+            ShardReadWriteGuard::<T>::map(map_read_write_guard, move |map_ref| {
+                // Already checked that the entry exists while holding the lock
+                map_ref.get_mut(&handle).unwrap()
+            });
+        Ok(ObjectReadWriteGuard { guard: object_read_write_guard })
+    }
+    fn deallocate(
+        &self,
+        handle: Handle,
+        outstanding_allocations_counter: &AtomicU32,
+    ) -> Result<T, HandleNotPresentError> {
+        let mut map_read_write_guard = self.get_read_write_guard_if_entry_exists(handle)?;
+        // We don't need to worry about double-decrements, since the above call
+        // got us an upgradable read guard for our read, which means it's the only
+        // outstanding upgradeable guard on the shard. See `spin` documentation.
+        // Remove the pointed-to object from the map, and return it,
+        // releasing the lock when the guard goes out of scope.
+        let removed_object = map_read_write_guard.deref_mut().remove(&handle).unwrap();
+        // Decrement the allocations counter. Release ordering because we want
+        // to ensure that clearing the map entry never gets re-ordered to after when
+        // this counter gets decremented.
+        outstanding_allocations_counter.sub(1, Ordering::Release);
+        Ok(removed_object)
+    }
+
+    fn try_allocate<F>(
+        &self,
+        handle: Handle,
+        object_provider: F,
+        outstanding_allocations_counter: &AtomicU32,
+        max_active_handles: u32,
+    ) -> Result<(), ShardAllocationError<T, F>>
+    where
+        F: FnOnce() -> T,
+    {
+        // Use an upgradeable read guard -> write guard to provide greater fairness
+        // toward writers (see `spin` documentation)
+        let map_upgradable_read_guard = ShardReadWriteLock::<T>::upgradable_read(&self.data);
+        let mut map_read_write_guard =
+            ShardUpgradableReadGuard::<T>::upgrade(map_upgradable_read_guard);
+        match map_read_write_guard.entry_ref(&handle) {
+            EntryRef::Occupied(_) => {
+                // We've already allocated for that handle-id, so yield
+                // the object provider back to the caller.
+                Err(ShardAllocationError::EntryOccupied(object_provider))
+            }
+            EntryRef::Vacant(vacant_entry) => {
+                // An entry is open, but we haven't yet checked the allocations count.
+                // Try to increment the total allocations count atomically.
+                // Use acquire ordering on a successful bump, because we don't want
+                // to invoke the allocation closure before we have a guaranteed slot.
+                // On the other hand, upon failure, we don't care about ordering
+                // of surrounding operations, and so we use a relaxed ordering there.
+                let allocation_count_bump_result = outstanding_allocations_counter.fetch_update(
+                    Ordering::Acquire,
+                    Ordering::Relaxed,
+                    |old_total_allocations| {
+                        if old_total_allocations >= max_active_handles {
+                            None
+                        } else {
+                            Some(old_total_allocations + 1)
+                        }
+                    },
+                );
+                match allocation_count_bump_result {
+                    Ok(_) => {
+                        // We're good to actually allocate
+                        let object = object_provider();
+                        vacant_entry.insert(object);
+                        Ok(())
+                    }
+                    Err(_) => {
+                        // The allocation would cause us to exceed the allowed allocations,
+                        // so release all locks and error.
+                        Err(ShardAllocationError::ExceedsAllocationLimit)
+                    }
+                }
+            }
+        }
+    }
+    /// Gets the actual number of elements stored in this shard.
+    /// Only suitable for single-threaded sections of tests.
+    #[cfg(test)]
+    fn len(&self) -> usize {
+        let guard = ShardReadWriteLock::<T>::read(&self.data);
+        guard.deref().len()
+    }
+}
+
+/// Externally-facing trait for things which behave like handle-map handles
+/// with a globally-defined handle-map for the type.
+pub trait HandleLike: Sized {
+    /// The underlying object type pointed-to by this handle
+    type Object: Send + Sync;
+
+    /// Tries to allocate a new handle using the given provider
+    /// to construct the underlying stored object as a new
+    /// entry into the global handle table for this type.
+    fn allocate(
+        initial_value_provider: impl FnOnce() -> Self::Object,
+    ) -> Result<Self, HandleMapFullError>;
+
+    /// Gets a RAII read-guard on the contents behind this handle.
+    fn get(&self) -> Result<ObjectReadGuard<Self::Object>, HandleNotPresentError>;
+
+    /// Gets a RAII read-write guard on the contents behind this handle.
+    fn get_mut(&self) -> Result<ObjectReadWriteGuard<Self::Object>, HandleNotPresentError>;
+
+    /// Deallocates the contents behind this handle.
+    fn deallocate(self) -> Result<Self::Object, HandleNotPresentError>;
+}
+
+#[macro_export]
+/// `declare_handle_map! { handle_module_name, handle_type_name, wrapped_type,
+/// map_dimension_provider }`
+///
+/// Declares a new public module with name `handle_module_name` which includes a new type
+/// `handle_type_name` which is `#[repr(C)]` and represents FFI-accessible handles
+/// to values of type `wrapped_type`.
+///
+/// Internal to the generated module, a new static `SingletonHandleMap` is created, where the
+/// maximum number of active handles and the number of shards are given by
+/// the dimensions returned by evaluation of the `map_dimension_provider` expression.
+///
+/// Note: `map_dimension_provider` will be evaluated within the defined module's scope,
+/// so you will likely need to use `super` to refer to definitions in the enclosing scope.
+///
+/// # Example
+/// The following code defines an FFI-safe type `StringHandle` which references
+/// the `String` data-type, and uses it to define a (contrived)
+/// function `sample` which will print "Hello World".
+///
+/// ```
+/// mod sample {
+///     use core::ops::Deref;
+///     use handle_map::{declare_handle_map, HandleMapDimensions, HandleLike};
+///
+///     fn get_string_handle_map_dimensions() -> HandleMapDimensions {
+///         HandleMapDimensions {
+///             num_shards: 8,
+///             max_active_handles: 100,
+///         }
+///     }
+///
+///     declare_handle_map! { string_handle, StringHandle, String,
+///                           super::get_string_handle_map_dimensions() }
+///
+///     use string_handle::StringHandle;
+///
+///     fn sample() {
+///         // Note: this method could panic if there are
+///         // more than 99 outstanding handles.
+///
+///         // Allocate a new string-handle pointing to the string "Hello"
+///         let handle = StringHandle::allocate(|| { "Hello".to_string() }).unwrap();
+///         {
+///             // Obtain a write-guard on the contents of our handle
+///             let mut handle_write_guard = handle.get_mut().unwrap();
+///             handle_write_guard.push_str(" World");
+///             // Write guard is auto-dropped at the end of this block.
+///         }
+///         {
+///             // Obtain a read-guard on the contents of our handle.
+///             // Note that we had to ensure that the write-guard was
+///             // dropped prior to doing this, or else execution
+///             // could potentially hang.
+///             let handle_read_guard = handle.get().unwrap();
+///             println!("{}", handle_read_guard.deref());
+///         }
+///         // Clean up the data behind the created handle
+///         handle.deallocate().unwrap();
+///     }
+/// }
+/// ```
+macro_rules! declare_handle_map {
+    ($handle_module_name:ident, $handle_type_name:ident, $wrapped_type:ty,
+     $map_dimension_provider:expr) => {
+        #[doc = concat!("Macro-generated (via `handle_map::declare_handle_map!`) module",
+                        " which defines the `", stringify!($handle_module_name), "::",
+                        stringify!($handle_type_name), "` FFI-transmissible handle type ",
+                        " which references values of type `", stringify!($wrapped_type), "`.")]
+        pub mod $handle_module_name {
+            use $crate::SingletonHandleMapInfo;
+
+            struct SingletonInfo;
+
+            static GLOBAL_HANDLE_MAP: $crate::SingletonHandleMap<SingletonInfo> =
+                $crate::SingletonHandleMap::with_info(SingletonInfo);
+
+            impl $crate::SingletonHandleMapInfo for SingletonInfo {
+                type Object = $wrapped_type;
+
+                fn dimensions(&self) -> $crate::HandleMapDimensions {
+                    $map_dimension_provider
+                }
+                fn get_handle_map() -> &'static $crate::HandleMap<$wrapped_type> {
+                    GLOBAL_HANDLE_MAP.get()
+                }
+            }
+
+            #[doc = concat!("A `#[repr(C)]` handle to a value of type `",
+                            stringify!($wrapped_type), "`.")]
+            #[repr(C)]
+            #[derive(Clone, Copy, PartialEq, Eq)]
+            pub struct $handle_type_name {
+                handle_id: u64,
+            }
+
+            impl $handle_type_name {
+                fn get_as_handle(&self) -> $crate::Handle {
+                    $crate::Handle::from_id(self.handle_id)
+                }
+            }
+            impl $crate::HandleLike for $handle_type_name {
+                type Object = $wrapped_type;
+                fn allocate(initial_value_provider: impl FnOnce() -> $wrapped_type,
+                ) -> Result<Self, $crate::HandleMapFullError> {
+                    SingletonInfo::get_handle_map().allocate(initial_value_provider)
+                        .map(|derived_handle| Self {
+                            handle_id: derived_handle.get_id(),
+                        })
+                }
+                fn get(&self) -> Result<$crate::ObjectReadGuard<$wrapped_type>, $crate::HandleNotPresentError> {
+                    SingletonInfo::get_handle_map().get(self.get_as_handle())
+                }
+                fn get_mut(&self) -> Result<$crate::ObjectReadWriteGuard<$wrapped_type>, $crate::HandleNotPresentError> {
+                    SingletonInfo::get_handle_map().get_mut(self.get_as_handle())
+                }
+                fn deallocate(self) -> Result<$wrapped_type, $crate::HandleNotPresentError> {
+                    SingletonInfo::get_handle_map().deallocate(self.get_as_handle())
+                }
+            }
+        }
+    }
+}
diff --git a/nearby/presence/handle_map/src/tests.rs b/nearby/presence/handle_map/src/tests.rs
new file mode 100644
index 0000000..d97657f
--- /dev/null
+++ b/nearby/presence/handle_map/src/tests.rs
@@ -0,0 +1,288 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+use crate::*;
+
+use hashbrown::HashSet;
+use std::sync::Arc;
+use std::thread;
+
+// Maximum number of active handles used across all tests
+// Chosen to be divisible by the number of active threads
+const MAX_ACTIVE_HANDLES: u32 = NUM_ACTIVE_THREADS * MAX_ACTIVE_HANDLES_PER_THREAD;
+
+const MAX_ACTIVE_HANDLES_PER_THREAD: u32 = 16384;
+
+// Deliberately picking a low number of shards so that we
+// are more likely to discover conflicts between threads.
+const NUM_SHARDS: u8 = 4;
+
+// Deliberately picking a higher number of threads.
+const NUM_ACTIVE_THREADS: u32 = 8;
+
+const DEFAULT_DIMENSIONS: HandleMapDimensions =
+    HandleMapDimensions { num_shards: NUM_SHARDS, max_active_handles: MAX_ACTIVE_HANDLES };
+
+fn build_handle_map<T: Send + Sync>() -> HandleMap<T> {
+    HandleMap::with_dimensions(DEFAULT_DIMENSIONS)
+}
+
+/// Performs the same testing function for each thread
+fn test_for_each_thread<F>(test_function_ref: Arc<F>, num_repetitions_per_thread: usize)
+where
+    F: Fn() + Send + Sync + 'static,
+{
+    let mut join_handles = Vec::new();
+    for _ in 0..NUM_ACTIVE_THREADS {
+        let test_function_clone = test_function_ref.clone();
+        let join_handle = thread::spawn(move || {
+            for _ in 0..num_repetitions_per_thread {
+                test_function_clone();
+            }
+        });
+        join_handles.push(join_handle);
+    }
+    for join_handle in join_handles {
+        join_handle.join().unwrap()
+    }
+}
+
+/// Tests the consistency of reads from the same handle across
+/// multiple threads.
+#[test]
+fn test_read_consistency_same_address() {
+    let num_repetitions_per_thread = 10000;
+    let handle_map = build_handle_map::<String>();
+    let handle = handle_map.allocate(|| "hello".to_string()).expect("Allocation shouldn't fail");
+    let test_fn = Arc::new(move || {
+        let value_ref = handle_map.get(handle).expect("Getting shouldn't fail");
+        assert_eq!("hello", value_ref.deref());
+    });
+    test_for_each_thread(test_fn, num_repetitions_per_thread);
+}
+
+/// Tests overloading the table with allocations to ensure
+/// that when all is said and done, we still haven't exceeded
+/// the allocations limit.
+#[test]
+#[allow(unused_must_use)]
+fn test_overload_with_allocations() {
+    let num_repetitions_per_thread = 2 * MAX_ACTIVE_HANDLES_PER_THREAD as usize;
+    let handle_map = build_handle_map::<u8>();
+
+    let handle_map_function_ref = Arc::new(handle_map);
+    let handle_map_post_function_ref = handle_map_function_ref.clone();
+
+    let test_fn = Arc::new(move || {
+        handle_map_function_ref.allocate(|| 0xFF);
+    });
+    test_for_each_thread(test_fn, num_repetitions_per_thread);
+
+    let actual_num_active_handles = handle_map_post_function_ref.len();
+    assert_eq!(MAX_ACTIVE_HANDLES as usize, actual_num_active_handles);
+}
+
+/// Tests deallocations and allocations near the allocation limit.
+#[test]
+#[allow(unused_must_use)]
+fn test_overload_allocations_deallocations() {
+    let num_repetitions_per_thread = 10000;
+
+    //Pre-fill the map so that there's only one available entry.
+    let handle_map = build_handle_map::<u8>();
+    for i in 0..(MAX_ACTIVE_HANDLES - 1) {
+        handle_map.allocate(|| (i % 256) as u8);
+    }
+
+    let handle_map_function_ref = Arc::new(handle_map);
+    let handle_map_post_function_ref = handle_map_function_ref.clone();
+
+    let test_fn = Arc::new(move || {
+        let allocation_result = handle_map_function_ref.allocate(|| 0xFF);
+        if let Ok(handle) = allocation_result {
+            handle_map_function_ref.deallocate(handle).unwrap();
+        }
+    });
+    test_for_each_thread(test_fn, num_repetitions_per_thread);
+
+    // No matter what happened above, we should have the same number
+    // of handles as when we started, because every successful allocation
+    // should have been paired with a successful deallocation.
+    let actual_num_active_handles = handle_map_post_function_ref.len();
+    assert_eq!((MAX_ACTIVE_HANDLES - 1) as usize, actual_num_active_handles);
+
+    //Verify that we still have space for one more entry after all that.
+    handle_map_post_function_ref.allocate(|| 0xEE).unwrap();
+}
+
+/// Tests the progress of allocate/read/write/read/deallocate
+/// to independent handles across multiple threads.
+#[test]
+fn test_full_lifecycle_independent_handles() {
+    let num_repetitions_per_thread = 10000;
+    let handle_map = build_handle_map::<String>();
+    let test_fn = Arc::new(move || {
+        let handle =
+            handle_map.allocate(|| "Hello".to_string()).expect("Allocation shouldn't fail");
+        {
+            let value_ref = handle_map.get(handle).expect("Getting the value shouldn't fail");
+            assert_eq!("Hello", &*value_ref);
+        };
+        {
+            let mut value_mut_ref =
+                handle_map.get_mut(handle).expect("Mutating the value shouldn't fail");
+            value_mut_ref.deref_mut().push_str(" World!");
+        };
+        {
+            let value_ref = handle_map
+                .get(handle)
+                .expect("Getting the value after modification shouldn't fail");
+            assert_eq!("Hello World!", &*value_ref);
+        };
+        let removed = handle_map.deallocate(handle).expect("Deallocation shouldn't fail");
+        assert_eq!("Hello World!", removed);
+    });
+    test_for_each_thread(test_fn, num_repetitions_per_thread);
+}
+
+/// Tests the consistency of reads+writes to the same handle,
+/// where threads modify and read different parts of an
+/// underlying structure.
+#[test]
+fn test_consistency_of_same_handle_multithreaded_modifications() {
+    let num_repetitions_per_thread = 10000;
+    let handle_map = Arc::new(build_handle_map::<(String, String)>());
+    let handle = handle_map
+        .allocate(|| ("A".to_string(), "B".to_string()))
+        .expect("Allocation shouldn't fail");
+
+    let handle_map_second_ref = handle_map.clone();
+
+    let join_handle_a = thread::spawn(move || {
+        for i in 1..num_repetitions_per_thread {
+            {
+                let value_ref =
+                    handle_map.get(handle).expect("Getting the value from thread A shouldn't fail");
+                let value = &value_ref.0;
+                assert_eq!(i, value.len());
+            }
+            {
+                let mut value_mut_ref = handle_map
+                    .get_mut(handle)
+                    .expect("Mutating the value from thread A shouldn't fail");
+                value_mut_ref.0.push('A');
+            }
+        }
+    });
+
+    let join_handle_b = thread::spawn(move || {
+        for i in 1..num_repetitions_per_thread {
+            {
+                let value_ref = handle_map_second_ref
+                    .get(handle)
+                    .expect("Getting the value from thread B shouldn't fail");
+                let value = &value_ref.1;
+                assert_eq!(i, value.len());
+            }
+            {
+                let mut value_mut_ref = handle_map_second_ref
+                    .get_mut(handle)
+                    .expect("Mutating the value from thread B shouldn't fail");
+                value_mut_ref.1.push('B');
+            }
+        }
+    });
+
+    join_handle_a.join().unwrap();
+    join_handle_b.join().unwrap();
+}
+
+/// Multi-threaded test to ensure that when attempting
+/// to allocate over handle IDs which are already allocated,
+/// all threads eventually get distinct, unused handle IDs
+/// for their own allocations.
+#[test]
+fn test_non_overwriting_old_handles() {
+    let mut all_handles: HashSet<Handle> = HashSet::new();
+    let num_repetitions_per_thread = 100;
+    let mut handle_map = build_handle_map::<u8>();
+    for _ in 0..(num_repetitions_per_thread * NUM_ACTIVE_THREADS) {
+        let handle = handle_map.allocate(|| 0xFF).expect("Initial allocations shouldn't fail");
+        all_handles.insert(handle);
+    }
+    // Reset the new-handle-id counter
+    handle_map.set_new_handle_id_counter(0);
+
+    let handle_map = Arc::new(handle_map);
+
+    let mut thread_handles: Vec<thread::JoinHandle<Vec<Handle>>> = Vec::new();
+    for _ in 0..NUM_ACTIVE_THREADS {
+        let handle_map_reference = handle_map.clone();
+        let thread_handle = thread::spawn(move || {
+            let mut handles = Vec::new();
+            for i in 0..num_repetitions_per_thread {
+                let handle = handle_map_reference
+                    .allocate(move || (i % 256) as u8)
+                    .expect("No allocation should fail");
+                handles.push(handle);
+            }
+            handles
+        });
+        thread_handles.push(thread_handle);
+    }
+    for thread_handle in thread_handles {
+        let handles: Vec<Handle> = thread_handle.join().expect("Individual threads shouldn't fail");
+        for handle in handles {
+            let was_distinct = all_handles.insert(handle);
+            assert!(was_distinct);
+        }
+    }
+}
+
+#[test]
+fn test_id_wraparound() {
+    let mut handle_map = build_handle_map::<u8>();
+    handle_map.set_new_handle_id_counter(u64::MAX);
+    handle_map.allocate(|| 0xAB).expect("Counter wrap-around allocation should not fail");
+    handle_map.allocate(|| 0xCD).expect("Post-counter-wrap-around allocation should not fail");
+}
+
+#[test]
+fn test_deallocate_unallocated_handle() {
+    let handle_map = build_handle_map::<usize>();
+    let handle = handle_map.allocate(|| 2).expect("Allocation shouldn't fail");
+    let deallocated = handle_map.deallocate(handle).expect("Deallocation shouldn't fail");
+    assert_eq!(2, deallocated);
+    let double_deallocate_result = handle_map.deallocate(handle);
+    assert!(double_deallocate_result.is_err());
+}
+
+#[test]
+fn test_get_unallocated_handle() {
+    let handle_map = build_handle_map::<u8>();
+    let handle = handle_map.allocate(|| 0xFE).expect("Allocation shouldn't fail");
+    let deallocated = handle_map.deallocate(handle).expect("Deallocation shouldn't fail");
+    assert_eq!(0xFE, deallocated);
+    let read_result = handle_map.get(handle);
+    assert!(read_result.is_err());
+}
+
+#[test]
+fn test_get_mut_unallocated_handle() {
+    let handle_map = build_handle_map::<(usize, usize, usize)>();
+    let handle = handle_map.allocate(|| (1, 2, 3)).expect("Allocation shouldn't fail");
+    let deallocated = handle_map.deallocate(handle).expect("Deallocation shouldn't fail");
+    assert_eq!((1, 2, 3), deallocated);
+    let get_mut_result = handle_map.get_mut(handle);
+    assert!(get_mut_result.is_err());
+}
diff --git a/nearby/presence/ldt/fuzz/Cargo.lock b/nearby/presence/ldt/fuzz/Cargo.lock
index 285bbca..767108f 100644
--- a/nearby/presence/ldt/fuzz/Cargo.lock
+++ b/nearby/presence/ldt/fuzz/Cargo.lock
@@ -4,9 +4,9 @@
 
 [[package]]
 name = "aead"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c192eb8f11fc081b0fe4259ba5af04217d4e0faddd02417310a927911abd7c8"
+checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
 dependencies = [
  "bytes",
  "crypto-common",
@@ -15,9 +15,9 @@
 
 [[package]]
 name = "aes"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433cfd6710c9986c576a25ca913c39d66a6474107b406f34f91d4a8923395241"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
 dependencies = [
  "cfg-if",
  "cipher",
@@ -69,9 +69,9 @@
 
 [[package]]
 name = "block-padding"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a90ec2df9600c28a01c56c4784c9207a96d2451833aeceb8cc97e4c9548bb78"
+checksum = "a8894febbff9f758034a5b8e12d87918f56dfc64a8e1fe757d65e29041538d93"
 dependencies = [
  "generic-array",
 ]
@@ -118,24 +118,24 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.5"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28d997bd5e24a5928dd43e46dc529867e207907fe0b239c3477d924f7f2ca320"
+checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c2538c4e68e52548bacb3e83ac549f903d44f011ac9d5abb5e132e67d0808f7"
+checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -193,23 +193,36 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-rc.2"
+version = "4.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
+checksum = "436ace70fc06e06f7f689d2624dc4e2f0ea666efb5aa704215f7249ae6e047a7"
 dependencies = [
  "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
  "digest",
  "fiat-crypto",
- "packed_simd_2",
  "platforms",
+ "rustc_version",
  "subtle",
 ]
 
 [[package]]
-name = "der"
-version = "0.7.1"
+name = "curve25519-dalek-derive"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc906908ea6458456e5eaa160a9c08543ec3d1e6f71e2235cedd660cb65f9df0"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "der"
+version = "0.7.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -217,9 +230,9 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3cdeb9ec472d588e539a818b2dee436825730da08ad0017c4b1a17676bdc8b7"
+checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -228,9 +241,9 @@
 
 [[package]]
 name = "digest"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
@@ -248,9 +261,9 @@
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "798f704d128510932661a3489b08e3f4c934a01d61c5def59ae7b8e48f19665a"
+checksum = "faa8e9049d5d72bfc12acbc05914731b5322f79b5e2f195e9f2d705fca22ab4c"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
@@ -260,9 +273,9 @@
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.2"
+version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ea5a92946e8614bb585254898bb7dd1ddad241ace60c52149e3765e34cc039d"
+checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -295,9 +308,9 @@
 
 [[package]]
 name = "generic-array"
-version = "0.14.6"
+version = "0.14.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bff49e947297f3312447abdca79f45f4738097cc82b06e72054d2223f601f1b9"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
 dependencies = [
  "typenum",
  "version_check",
@@ -306,9 +319,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.8"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "libc",
@@ -391,9 +404,9 @@
 
 [[package]]
 name = "libc"
-version = "0.2.140"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "libfuzzer-sys"
@@ -407,16 +420,10 @@
 ]
 
 [[package]]
-name = "libm"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
-
-[[package]]
 name = "once_cell"
-version = "1.17.1"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "opaque-debug"
@@ -426,25 +433,15 @@
 
 [[package]]
 name = "p256"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7270da3e5caa82afd3deb054cc237905853813aea3859544bc082c3fe55b8d47"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
 dependencies = [
  "elliptic-curve",
  "primeorder",
 ]
 
 [[package]]
-name = "packed_simd_2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
-dependencies = [
- "cfg-if",
- "libm",
-]
-
-[[package]]
 name = "platforms"
 version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -452,9 +449,9 @@
 
 [[package]]
 name = "polyval"
-version = "0.6.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef234e08c11dfcb2e56f79fd70f6f2eb7f025c0ce2333e82f4f0518ecad30c6"
+checksum = "d52cff9d1d4dee5fe6d03729099f4a310a41179e0a10dbf542039873f2e826fb"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -470,27 +467,27 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7613fdcc0831c10060fa69833ea8fa2caa94b6456f51e25356a885b530a2e3d0"
+checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.53"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba466839c78239c09faf015484e5cc04860f88242cff4d03eb038f04b4699b73"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.26"
+version = "1.0.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
+checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
 dependencies = [
  "proc-macro2",
 ]
@@ -524,10 +521,19 @@
 ]
 
 [[package]]
-name = "sec1"
-version = "0.7.1"
+name = "rustc_version"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48518a2b5775ba8ca5b46596aae011caa431e6ce7e4a67ead66d92f08884220e"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "sec1"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
 dependencies = [
  "base16ct",
  "der",
@@ -537,10 +543,16 @@
 ]
 
 [[package]]
-name = "sha2"
-version = "0.10.6"
+name = "semver"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+
+[[package]]
+name = "sha2"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -555,15 +567,15 @@
 
 [[package]]
 name = "subtle"
-version = "2.4.1"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
 [[package]]
 name = "syn"
-version = "1.0.109"
+version = "2.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -578,15 +590,15 @@
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.8"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "universal-hash"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d3160b73c9a19f7e2939a2fdad446c57c1bbbbf4d919d3213ff1267a580d8b5"
+checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
 dependencies = [
  "crypto-common",
  "subtle",
@@ -606,9 +618,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabd6e16dd08033932fc3265ad4510cc2eab24656058a6dcb107ffe274abcc95"
+checksum = "ec7fae07da688e17059d5886712c933bb0520f15eff2e09cfa18e30968f4e63a"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
@@ -625,6 +637,6 @@
 
 [[package]]
 name = "zeroize"
-version = "1.5.7"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c394b5bd0c6f669e7275d9c20aa90ae064cb22e75a1cad54e1b34088034b149f"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
diff --git a/nearby/presence/ldt_np_adv/fuzz/Cargo.lock b/nearby/presence/ldt_np_adv/fuzz/Cargo.lock
index 92f2deb..5050ad0 100644
--- a/nearby/presence/ldt_np_adv/fuzz/Cargo.lock
+++ b/nearby/presence/ldt_np_adv/fuzz/Cargo.lock
@@ -4,9 +4,9 @@
 
 [[package]]
 name = "aead"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c192eb8f11fc081b0fe4259ba5af04217d4e0faddd02417310a927911abd7c8"
+checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
 dependencies = [
  "bytes",
  "crypto-common",
@@ -15,9 +15,9 @@
 
 [[package]]
 name = "aes"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433cfd6710c9986c576a25ca913c39d66a6474107b406f34f91d4a8923395241"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
 dependencies = [
  "cfg-if",
  "cipher",
@@ -73,9 +73,9 @@
 
 [[package]]
 name = "block-padding"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a90ec2df9600c28a01c56c4784c9207a96d2451833aeceb8cc97e4c9548bb78"
+checksum = "a8894febbff9f758034a5b8e12d87918f56dfc64a8e1fe757d65e29041538d93"
 dependencies = [
  "generic-array",
 ]
@@ -122,24 +122,24 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.5"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28d997bd5e24a5928dd43e46dc529867e207907fe0b239c3477d924f7f2ca320"
+checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c2538c4e68e52548bacb3e83ac549f903d44f011ac9d5abb5e132e67d0808f7"
+checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -197,23 +197,36 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-rc.2"
+version = "4.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
+checksum = "436ace70fc06e06f7f689d2624dc4e2f0ea666efb5aa704215f7249ae6e047a7"
 dependencies = [
  "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
  "digest",
  "fiat-crypto",
- "packed_simd_2",
  "platforms",
+ "rustc_version",
  "subtle",
 ]
 
 [[package]]
-name = "der"
-version = "0.7.1"
+name = "curve25519-dalek-derive"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc906908ea6458456e5eaa160a9c08543ec3d1e6f71e2235cedd660cb65f9df0"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "der"
+version = "0.7.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -221,9 +234,9 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3cdeb9ec472d588e539a818b2dee436825730da08ad0017c4b1a17676bdc8b7"
+checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -232,9 +245,9 @@
 
 [[package]]
 name = "digest"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
@@ -252,9 +265,9 @@
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "798f704d128510932661a3489b08e3f4c934a01d61c5def59ae7b8e48f19665a"
+checksum = "faa8e9049d5d72bfc12acbc05914731b5322f79b5e2f195e9f2d705fca22ab4c"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
@@ -264,9 +277,9 @@
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.2"
+version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ea5a92946e8614bb585254898bb7dd1ddad241ace60c52149e3765e34cc039d"
+checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -299,9 +312,9 @@
 
 [[package]]
 name = "generic-array"
-version = "0.14.6"
+version = "0.14.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bff49e947297f3312447abdca79f45f4738097cc82b06e72054d2223f601f1b9"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
 dependencies = [
  "typenum",
  "version_check",
@@ -310,9 +323,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.8"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "libc",
@@ -409,9 +422,9 @@
 
 [[package]]
 name = "libc"
-version = "0.2.140"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "libfuzzer-sys"
@@ -425,12 +438,6 @@
 ]
 
 [[package]]
-name = "libm"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
-
-[[package]]
 name = "np_hkdf"
 version = "0.1.0"
 dependencies = [
@@ -441,9 +448,9 @@
 
 [[package]]
 name = "once_cell"
-version = "1.17.1"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "opaque-debug"
@@ -453,25 +460,15 @@
 
 [[package]]
 name = "p256"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7270da3e5caa82afd3deb054cc237905853813aea3859544bc082c3fe55b8d47"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
 dependencies = [
  "elliptic-curve",
  "primeorder",
 ]
 
 [[package]]
-name = "packed_simd_2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
-dependencies = [
- "cfg-if",
- "libm",
-]
-
-[[package]]
 name = "platforms"
 version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -479,9 +476,9 @@
 
 [[package]]
 name = "polyval"
-version = "0.6.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef234e08c11dfcb2e56f79fd70f6f2eb7f025c0ce2333e82f4f0518ecad30c6"
+checksum = "d52cff9d1d4dee5fe6d03729099f4a310a41179e0a10dbf542039873f2e826fb"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -497,27 +494,27 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7613fdcc0831c10060fa69833ea8fa2caa94b6456f51e25356a885b530a2e3d0"
+checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.53"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba466839c78239c09faf015484e5cc04860f88242cff4d03eb038f04b4699b73"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.26"
+version = "1.0.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
+checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
 dependencies = [
  "proc-macro2",
 ]
@@ -551,10 +548,19 @@
 ]
 
 [[package]]
-name = "sec1"
-version = "0.7.1"
+name = "rustc_version"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48518a2b5775ba8ca5b46596aae011caa431e6ce7e4a67ead66d92f08884220e"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "sec1"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
 dependencies = [
  "base16ct",
  "der",
@@ -564,10 +570,16 @@
 ]
 
 [[package]]
-name = "sha2"
-version = "0.10.6"
+name = "semver"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+
+[[package]]
+name = "sha2"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -582,15 +594,15 @@
 
 [[package]]
 name = "subtle"
-version = "2.4.1"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
 [[package]]
 name = "syn"
-version = "1.0.109"
+version = "2.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -605,15 +617,15 @@
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.8"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "universal-hash"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d3160b73c9a19f7e2939a2fdad446c57c1bbbbf4d919d3213ff1267a580d8b5"
+checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
 dependencies = [
  "crypto-common",
  "subtle",
@@ -633,9 +645,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabd6e16dd08033932fc3265ad4510cc2eab24656058a6dcb107ffe274abcc95"
+checksum = "ec7fae07da688e17059d5886712c933bb0520f15eff2e09cfa18e30968f4e63a"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
@@ -652,6 +664,6 @@
 
 [[package]]
 name = "zeroize"
-version = "1.5.7"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c394b5bd0c6f669e7275d9c20aa90ae064cb22e75a1cad54e1b34088034b149f"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
diff --git a/nearby/presence/ldt_np_adv_ffi/.cargo/config-boringssl.toml b/nearby/presence/ldt_np_adv_ffi/.cargo/config-boringssl.toml
index f5ab7fa..5a4a047 100644
--- a/nearby/presence/ldt_np_adv_ffi/.cargo/config-boringssl.toml
+++ b/nearby/presence/ldt_np_adv_ffi/.cargo/config-boringssl.toml
@@ -1,3 +1,3 @@
 paths = [
     "../../../boringssl-build/boringssl/rust/bssl-crypto",
-]
\ No newline at end of file
+]
diff --git a/nearby/presence/ldt_np_adv_ffi/Cargo.lock b/nearby/presence/ldt_np_adv_ffi/Cargo.lock
index e58cea8..1d13887 100644
--- a/nearby/presence/ldt_np_adv_ffi/Cargo.lock
+++ b/nearby/presence/ldt_np_adv_ffi/Cargo.lock
@@ -3,12 +3,6 @@
 version = 3
 
 [[package]]
-name = "Inflector"
-version = "0.11.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
-
-[[package]]
 name = "aead"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -21,9 +15,9 @@
 
 [[package]]
 name = "aes"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433cfd6710c9986c576a25ca913c39d66a6474107b406f34f91d4a8923395241"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
 dependencies = [
  "cfg-if",
  "cipher",
@@ -144,24 +138,24 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "6340df57935414636969091153f35f68d9f00bbc8fb4a9c6054706c213e6c6bc"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.6"
+version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "280a9f2d8b3a38871a3c8a46fb80db65e5e5ed97da80c4d08bf27fb63e35e181"
+checksum = "03e69e28e9f7f77debdedbaafa2866e1de9ba56df55a8bd7cfc724c25a09987c"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c2538c4e68e52548bacb3e83ac549f903d44f011ac9d5abb5e132e67d0808f7"
+checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -246,24 +240,37 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-rc.2"
+version = "4.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
+checksum = "436ace70fc06e06f7f689d2624dc4e2f0ea666efb5aa704215f7249ae6e047a7"
 dependencies = [
  "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
  "digest",
  "fiat-crypto",
- "packed_simd_2",
  "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
 [[package]]
-name = "der"
-version = "0.7.3"
+name = "curve25519-dalek-derive"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82b10af9f9f9f2134a42d3f8aa74658660f2e0234b0eb81bd171df8aa32779ed"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.22",
+]
+
+[[package]]
+name = "der"
+version = "0.7.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -271,9 +278,9 @@
 
 [[package]]
 name = "digest"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
@@ -292,9 +299,9 @@
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "798f704d128510932661a3489b08e3f4c934a01d61c5def59ae7b8e48f19665a"
+checksum = "faa8e9049d5d72bfc12acbc05914731b5322f79b5e2f195e9f2d705fca22ab4c"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
@@ -306,9 +313,9 @@
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.3"
+version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22cdacd4d6ed3f9b98680b679c0e52a823b8a2c7a97358d508fe247f2180c282"
+checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -367,9 +374,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c85e1d9ab2eadba7e5040d4e09cbd6d072b76a557ad64e797c2cb9d4da21d7e4"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "libc",
@@ -388,6 +395,12 @@
 ]
 
 [[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
+[[package]]
 name = "hkdf"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -472,9 +485,9 @@
 
 [[package]]
 name = "libc"
-version = "0.2.141"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3304a64d199bb964be99741b7a14d26972741915b3649639149b2479bb46f4b5"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "libc_alloc"
@@ -483,16 +496,10 @@
 checksum = "6a090348b66d90d8507e30f0d2bd88e5a5c454bd1733fc6d617cbc3471bf69ea"
 
 [[package]]
-name = "libm"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
-
-[[package]]
 name = "lock_api"
-version = "0.4.9"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "435011366fe56583b16cf956f9df0095b405b82d76425bc8981c0e22e60ec4df"
+checksum = "c1cc9717a20b1bb222f333e6a92fd32f7d8a18ddc5a3191a11af45dcbf4dcd16"
 dependencies = [
  "autocfg",
  "scopeguard",
@@ -509,9 +516,9 @@
 
 [[package]]
 name = "once_cell"
-version = "1.17.1"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "opaque-debug"
@@ -521,9 +528,9 @@
 
 [[package]]
 name = "openssl"
-version = "0.10.49"
+version = "0.10.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d2f106ab837a24e03672c59b1239669a0596406ff657c3c0835b6b7f0f35a33"
+checksum = "345df152bc43501c5eb9e4654ff05f794effb78d4efe3d53abc158baddc0703d"
 dependencies = [
  "bitflags",
  "cfg-if",
@@ -542,14 +549,14 @@
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.13",
+ "syn 2.0.22",
 ]
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.84"
+version = "0.9.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a20eace9dc2d82904039cb76dcf50fb1a0bba071cfd1629720b5d6f1ddba0fa"
+checksum = "374533b0e45f3a7ced10fcaeccca020e66656bc03dac384f852e4e5a7a8104a6"
 dependencies = [
  "cc",
  "libc",
@@ -559,48 +566,39 @@
 
 [[package]]
 name = "ouroboros"
-version = "0.15.6"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1358bd1558bd2a083fed428ffeda486fbfb323e698cdda7794259d592ca72db"
+checksum = "d813b7b31a82efae94bd30ffaac09aec85efc18db2d5ec3aead1a220ee954351"
 dependencies = [
  "aliasable",
  "ouroboros_macro",
+ "static_assertions",
 ]
 
 [[package]]
 name = "ouroboros_macro"
-version = "0.15.6"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f7d21ccd03305a674437ee1248f3ab5d4b1db095cf1caf49f1713ddf61956b7"
+checksum = "5a56f651b4dd45ae3ac3d260ced32eaf0620cddaae5f26c69b554a9016594726"
 dependencies = [
- "Inflector",
+ "heck",
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.22",
 ]
 
 [[package]]
 name = "p256"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7270da3e5caa82afd3deb054cc237905853813aea3859544bc082c3fe55b8d47"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
 dependencies = [
  "elliptic-curve",
  "primeorder",
 ]
 
 [[package]]
-name = "packed_simd_2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
-dependencies = [
- "cfg-if",
- "libm",
-]
-
-[[package]]
 name = "panic-abort"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -618,9 +616,9 @@
 
 [[package]]
 name = "pkg-config"
-version = "0.3.26"
+version = "0.3.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ac9a59f73473f1b8d852421e59e64809f025994837ef743615c6d0c5b305160"
+checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
 
 [[package]]
 name = "platforms"
@@ -630,9 +628,9 @@
 
 [[package]]
 name = "polyval"
-version = "0.6.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef234e08c11dfcb2e56f79fd70f6f2eb7f025c0ce2333e82f4f0518ecad30c6"
+checksum = "d52cff9d1d4dee5fe6d03729099f4a310a41179e0a10dbf542039873f2e826fb"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -648,9 +646,9 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7613fdcc0831c10060fa69833ea8fa2caa94b6456f51e25356a885b530a2e3d0"
+checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
 dependencies = [
  "elliptic-curve",
 ]
@@ -681,18 +679,18 @@
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.56"
+version = "1.0.63"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b63bdb0cd06f1f4dedf69b254734f9b45af66e4a031e42a7480257d9898b435"
+checksum = "7b368fba921b0dce7e60f5e04ec15e565b3303972b42bcfde1d0713b881959eb"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.26"
+version = "1.0.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
+checksum = "573015e8ab27661678357f27dc26460738fd2b6c86e46f386fde94cb5d913105"
 dependencies = [
  "proc-macro2",
 ]
@@ -728,6 +726,15 @@
 ]
 
 [[package]]
+name = "rustc_version"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
 name = "scopeguard"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -735,9 +742,9 @@
 
 [[package]]
 name = "sec1"
-version = "0.7.1"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48518a2b5775ba8ca5b46596aae011caa431e6ce7e4a67ead66d92f08884220e"
+checksum = "f0aec48e813d6b90b15f0b8948af3c63483992dee44c03e9930b3eebdabe046e"
 dependencies = [
  "base16ct",
  "der",
@@ -747,16 +754,22 @@
 ]
 
 [[package]]
-name = "serde"
-version = "1.0.159"
+name = "semver"
+version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c04e8343c3daeec41f58990b9d77068df31209f2af111e059e9fe9646693065"
+checksum = "bebd363326d05ec3e2f532ab7660680f3b02130d780c299bca73469d521bc0ed"
+
+[[package]]
+name = "serde"
+version = "1.0.164"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e8c8cf938e98f769bc164923b06dce91cea1751522f46f8466461af04c9027d"
 
 [[package]]
 name = "sha2"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -786,19 +799,25 @@
 
 [[package]]
 name = "spki"
-version = "0.7.1"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37a5be806ab6f127c3da44b7378837ebf01dadca8510a0e572460216b228bd0e"
+checksum = "9d1e996ef02c474957d681f1b05213dfb0abab947b446a62d37770b23500184a"
 dependencies = [
  "base64ct",
  "der",
 ]
 
 [[package]]
-name = "subtle"
-version = "2.4.1"
+name = "static_assertions"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
+[[package]]
+name = "subtle"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
 [[package]]
 name = "syn"
@@ -807,15 +826,14 @@
 checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
 dependencies = [
  "proc-macro2",
- "quote",
  "unicode-ident",
 ]
 
 [[package]]
 name = "syn"
-version = "2.0.13"
+version = "2.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c9da457c5285ac1f936ebd076af6dac17a61cfe7826f2076b4d015cf47bc8ec"
+checksum = "2efbeae7acf4eabd6bcdcbd11c92f45231ddda7539edc7806bd1a04a03b24616"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -830,15 +848,15 @@
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.8"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+checksum = "b15811caf2415fb889178633e7724bad2509101cde276048e013b9def5e51fa0"
 
 [[package]]
 name = "universal-hash"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d3160b73c9a19f7e2939a2fdad446c57c1bbbbf4d919d3213ff1267a580d8b5"
+checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
 dependencies = [
  "crypto-common",
  "subtle",
@@ -864,9 +882,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabd6e16dd08033932fc3265ad4510cc2eab24656058a6dcb107ffe274abcc95"
+checksum = "ec7fae07da688e17059d5886712c933bb0520f15eff2e09cfa18e30968f4e63a"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
diff --git a/nearby/presence/ldt_np_adv_ffi/deny.toml b/nearby/presence/ldt_np_adv_ffi/deny.toml
index 07381d1..ca51e11 100644
--- a/nearby/presence/ldt_np_adv_ffi/deny.toml
+++ b/nearby/presence/ldt_np_adv_ffi/deny.toml
@@ -79,6 +79,7 @@
     "MIT",
     "Apache-2.0",
     "BSD-3-Clause",
+    "Unicode-DFS-2016",
 ]
 # List of explicitly disallowed licenses
 # See https://spdx.org/licenses/ for list of possible licenses
diff --git a/nearby/presence/ldt_np_adv_ffi_fuzz/CMakeLists.txt b/nearby/presence/ldt_np_adv_ffi_fuzz/CMakeLists.txt
index 3282533..2144811 100644
--- a/nearby/presence/ldt_np_adv_ffi_fuzz/CMakeLists.txt
+++ b/nearby/presence/ldt_np_adv_ffi_fuzz/CMakeLists.txt
@@ -15,10 +15,10 @@
 cmake_minimum_required(VERSION 3.0)
 
 # libfuzzer needs clang
-SET (CMAKE_C_COMPILER "clang")
+SET(CMAKE_C_COMPILER "clang")
 
 include_directories(
-    ${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/include/)
+        ${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/include/)
 
 # enable fuzzer with ASAN
 # Can't use MSAN since EVP_KDF_fetch seems to read uninitialized memory, maybe on purpose?
@@ -26,22 +26,22 @@
 
 # we need at least version 3.0.5 for the core.h header used in the fuzzers
 find_package(OpenSSL 3.0.5 REQUIRED)
-if ( OPENSSL_FOUND )
+if (OPENSSL_FOUND)
     message(STATUS "OpenSSL Found: ${OPENSSL_VERSION}")
     message(STATUS "OpenSSL Include: ${OPENSSL_INCLUDE_DIR}")
     message(STATUS "OpenSSL Libraries: ${OPENSSL_LIBRARIES}")
-endif()
+endif ()
 
 add_executable(fuzzer_decrypt_bad_mac src/fuzzer_decrypt_bad_mac.c)
 target_link_libraries(fuzzer_decrypt_bad_mac
-    optimized "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
-    debug "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/debug/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
-    dl pthread -fsanitize=fuzzer,address)
+        optimized "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        debug "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/debug/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        dl pthread -fsanitize=fuzzer,address)
 target_link_libraries(fuzzer_decrypt_bad_mac OpenSSL::SSL)
 
 add_executable(fuzzer_decrypt_correct_mac src/fuzzer_decrypt_correct_mac.c)
 target_link_libraries(fuzzer_decrypt_correct_mac
-    optimized "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
-    debug "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/debug/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
-    dl pthread -fsanitize=fuzzer,address)
+        optimized "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        debug "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/debug/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        dl pthread -fsanitize=fuzzer,address)
 target_link_libraries(fuzzer_decrypt_correct_mac OpenSSL::SSL)
diff --git a/nearby/presence/ldt_np_c_sample/CMakeLists.txt b/nearby/presence/ldt_np_c_sample/CMakeLists.txt
index 4341c3e..588078a 100644
--- a/nearby/presence/ldt_np_c_sample/CMakeLists.txt
+++ b/nearby/presence/ldt_np_c_sample/CMakeLists.txt
@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.0)
-
 include_directories(
     ${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/include/
     ${CMAKE_SOURCE_DIR}/ldt_np_c_sample/)
@@ -28,13 +26,28 @@
     BINARY_DIR "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi"
     INSTALL_COMMAND "")
 
-add_executable(sample main.c)
-target_link_libraries(sample
+add_executable(ldt_c_sample main.c)
+target_link_libraries(
+    ldt_c_sample
     optimized "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
     debug "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/debug/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
-    dl pthread)
+    OpenSSL::SSL
+)
+
+if(UNIX)
+  target_link_libraries(
+    ldt_c_sample
+    dl pthread
+  )
+elseif(MSVC)
+  target_link_libraries(
+    ldt_c_sample
+    bcrypt ntdll userenv ws2_32
+  )
+endif()
+
 
 if(ENABLE_TESTS)
-    message(STATUS "Building tests")
+    message(STATUS "Enabling ldt tests")
     add_subdirectory(tests)
 endif()
diff --git a/nearby/presence/ldt_np_c_sample/tests/CMakeLists.txt b/nearby/presence/ldt_np_c_sample/tests/CMakeLists.txt
index 2f0818d..6edfd63 100644
--- a/nearby/presence/ldt_np_c_sample/tests/CMakeLists.txt
+++ b/nearby/presence/ldt_np_c_sample/tests/CMakeLists.txt
@@ -12,67 +12,56 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.14)
-
-# GoogleTest requires at least C++14
-set(CMAKE_CXX_STANDARD 14)
-add_compile_options(-Wall -Wextra -Wimplicit-fallthrough -Wextra-semi
-        -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi
-        -Wno-unneeded-internal-declaration
-        -Wno-ignored-pragma-optimize
-        -Wno-bitfield-constant-conversion -Wno-deprecated-this-capture -Wshadow
-        -Wsign-compare)
-
-include(FetchContent)
-FetchContent_Declare(
-  googletest
-  GIT_REPOSITORY https://github.com/google/googletest.git
-  GIT_TAG release-1.12.1
-)
-FetchContent_MakeAvailable(googletest)
-enable_testing()
-
-
-find_package(benchmark REQUIRED)
-add_compile_options(-fsanitize=address)
-
 file(COPY ${CMAKE_SOURCE_DIR}/ldt_np_adv/resources/test/np_adv_test_vectors.json
      DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 
-set(JSONCPP_DIR ${CMAKE_SOURCE_DIR}/../../third_party/jsoncpp)
-include_directories(${JSONCPP_DIR})
-
-add_library(
-  jsoncpp
-  ${JSONCPP_DIR}/jsoncpp.cpp
-)
-
 add_executable(
-  np_ffi_tests
-  np_ffi_tests.cc
-)
-
-add_executable(
-  benchmarks
-  benchmarks.cc
+  ldt_ffi_tests
+  ldt_ffi_tests.cc
 )
 
 target_link_libraries(
-  benchmarks
-  "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
-  OpenSSL::SSL
-  benchmark::benchmark
-  dl pthread -fsanitize=address
-)
-
-target_link_libraries(
-  np_ffi_tests
+  ldt_ffi_tests
   "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
   jsoncpp
   GTest::gtest_main
   OpenSSL::SSL
-  dl pthread -fsanitize=address
+)
+if(UNIX)
+  target_link_libraries(
+    ldt_ffi_tests
+    dl pthread -fsanitize=address
+  )
+elseif(MSVC)
+  target_link_libraries(
+    ldt_ffi_tests
+    bcrypt ntdll userenv ws2_32
+  )
+endif()
+
+gtest_discover_tests(ldt_ffi_tests)
+
+# Benchmarks
+add_executable(
+  ldt_benchmarks
+  ldt_benchmarks.cc
 )
 
-include(GoogleTest)
-gtest_discover_tests(np_ffi_tests)
+target_link_libraries(
+  ldt_benchmarks
+  "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+  benchmark::benchmark
+  OpenSSL::SSL
+)
+
+if(UNIX)
+  target_link_libraries(
+    ldt_benchmarks
+    dl pthread -fsanitize=address
+  )
+elseif(MSVC)
+  target_link_libraries(
+    ldt_benchmarks
+    bcrypt ntdll userenv ws2_32
+  )
+endif()
diff --git a/nearby/presence/ldt_np_c_sample/tests/benchmarks.cc b/nearby/presence/ldt_np_c_sample/tests/ldt_benchmarks.cc
similarity index 100%
rename from nearby/presence/ldt_np_c_sample/tests/benchmarks.cc
rename to nearby/presence/ldt_np_c_sample/tests/ldt_benchmarks.cc
diff --git a/nearby/presence/ldt_np_c_sample/tests/ldt_ffi_tests.cc b/nearby/presence/ldt_np_c_sample/tests/ldt_ffi_tests.cc
new file mode 100644
index 0000000..e66af65
--- /dev/null
+++ b/nearby/presence/ldt_np_c_sample/tests/ldt_ffi_tests.cc
@@ -0,0 +1,300 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <gtest/gtest.h>
+#include <json/json.h>
+
+extern "C" {
+#include "np_ldt.h"
+}
+
+#include <algorithm>
+#include <fstream>
+
+// TODO: get multi threaded tests working on windows
+#ifndef _WIN32
+#include <pthread.h>
+#endif
+
+#ifdef LDT_TEST_VECTORS
+static const char *PATH_TO_DATA_FILE = LDT_TEST_VECTORS;
+#else
+static const char *PATH_TO_DATA_FILE = "np_adv_test_vectors.json";
+#endif
+static const uint8_t KEY_SEED_BYTES[] = {
+    204, 219, 36, 137, 233, 252, 172, 66,  179, 147, 72, 184, 148, 30, 209, 154,
+    29,  54,  14, 117, 224, 152, 200, 193, 94,  107, 28, 194, 182, 32, 205, 57};
+static const uint8_t KNOWN_HMAC_BYTES[] = {
+    223, 185, 10,  31,  155, 31, 226, 141, 24,  187, 204,
+    165, 34,  64,  181, 204, 44, 203, 95,  141, 82,  137,
+    163, 203, 100, 235, 53,  65, 202, 97,  75,  180};
+static const uint8_t TEST_DATA_BYTES[] = {205, 104, 63, 225, 161, 209, 248,
+                                          70,  84,  61, 10,  19,  212, 174,
+                                          164, 0,   64, 200, 214, 123};
+
+static NpLdtSalt salt = {{12, 15}};
+
+static NpLdtEncryptHandle create_enc_handle_from_test_key() {
+  NpLdtKeySeed key_seed;
+  memcpy(key_seed.bytes, KEY_SEED_BYTES, 32);
+
+  return NpLdtEncryptCreate(key_seed);
+}
+
+static NpLdtDecryptHandle create_dec_handle_from_test_key() {
+  NpLdtKeySeed key_seed;
+  memcpy(key_seed.bytes, KEY_SEED_BYTES, 32);
+
+  NpMetadataKeyHmac known_hmac;
+  memcpy(known_hmac.bytes, KNOWN_HMAC_BYTES, 32);
+
+  return NpLdtDecryptCreate(key_seed, known_hmac);
+}
+
+static void hex_string_to_bytes(const char *hexString, uint8_t *out,
+                                size_t len) {
+  for (size_t count = 0; count < len; count++) {
+    sscanf(hexString, "%2hhx", &out[count]); // NOLINT(cert-err34-c)
+    hexString += 2;
+  }
+}
+
+static void bytes_to_hex_string(uint8_t *data, char *out, size_t len) {
+  std::stringstream ss;
+  ss << std::hex;
+  for (size_t i = 0; i < len; ++i)
+    ss << std::setw(2) << std::setfill('0') << (int)data[i];
+
+  std::string result = ss.str();
+  transform(result.begin(), result.end(), result.begin(), ::toupper);
+  strcpy(out, result.c_str());
+}
+
+// Run through JSON data with test cases generated by Rust tests.
+// Using generated data for now because the C layer does not have the ability
+// to generate the ldt_key and hmac_key from a key_seed, this is an
+// implementation detail of the rust ldt library
+TEST(LdtFfiTests, TestJsonData) {
+  Json::Value root;
+  Json::Reader reader;
+  std::ifstream test(PATH_TO_DATA_FILE);
+  bool parsingSuccessful = reader.parse(test, root, false);
+  if (!parsingSuccessful) {
+    std::cout << reader.getFormattedErrorMessages() << "\n";
+  }
+  ASSERT_TRUE(root.size() == 1000);
+
+  for (const auto &v : root) {
+    auto key_seed = v["key_seed"].asCString();
+    auto metadata_key_hmac = v["metadata_key_hmac"].asCString();
+    auto adv_salt = v["adv_salt"].asCString();
+    auto plaintext = v["plaintext"].asCString();
+    auto ciphertext = v["ciphertext"].asCString();
+
+    NpLdtKeySeed np_key_seed;
+    auto len = strlen(key_seed) / 2;
+    hex_string_to_bytes(key_seed, np_key_seed.bytes, len);
+    ASSERT_EQ(len, 32);
+
+    NpMetadataKeyHmac known_hmac;
+    len = strlen(metadata_key_hmac) / 2;
+    hex_string_to_bytes(metadata_key_hmac, known_hmac.bytes, len);
+    ASSERT_EQ(len, 32);
+
+    NpLdtEncryptHandle enc_handle = NpLdtEncryptCreate(np_key_seed);
+    ASSERT_TRUE(enc_handle.handle != 0);
+
+    NpLdtSalt salt_data;
+    len = strlen(adv_salt) / 2;
+    hex_string_to_bytes(adv_salt, salt_data.bytes, len);
+    ASSERT_TRUE(len == 2);
+
+    len = strlen(plaintext) / 2;
+    auto buffer = (uint8_t *)malloc(len);
+    hex_string_to_bytes(plaintext, buffer, len);
+    NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, buffer, len, salt_data);
+    ASSERT_EQ(result, NP_LDT_SUCCESS);
+
+    char *output = (char *)malloc(strlen(plaintext) + 1);
+    bytes_to_hex_string(buffer, output, len);
+    ASSERT_EQ(strcmp(output, ciphertext), 0);
+
+    NpLdtDecryptHandle dec_handle = NpLdtDecryptCreate(np_key_seed, known_hmac);
+    ASSERT_TRUE(dec_handle.handle != 0);
+
+    result = NpLdtDecryptAndVerify(dec_handle, buffer, len, salt_data);
+    ASSERT_EQ(result, NP_LDT_SUCCESS);
+
+    result = NpLdtEncryptClose(enc_handle);
+    ASSERT_EQ(result, NP_LDT_SUCCESS);
+
+    result = NpLdtDecryptClose(dec_handle);
+    ASSERT_EQ(result, NP_LDT_SUCCESS);
+
+    bytes_to_hex_string(buffer, output, len);
+    ASSERT_EQ(strcmp(output, plaintext), 0);
+    free(buffer);
+    free(output);
+  }
+  test.close();
+}
+
+TEST(LdtFfiTests, TestValidLength) {
+  auto plaintext = (uint8_t *)malloc(20 * sizeof(uint8_t));
+  memcpy(plaintext, TEST_DATA_BYTES, 20);
+
+  NpLdtEncryptHandle enc_handle = create_enc_handle_from_test_key();
+  ASSERT_TRUE(enc_handle.handle != 0);
+
+  NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, plaintext, 20, salt);
+  ASSERT_EQ(result, NP_LDT_SUCCESS);
+
+  NpLdtDecryptHandle dec_handle = create_dec_handle_from_test_key();
+
+  result = NpLdtDecryptAndVerify(dec_handle, plaintext, 20, salt);
+  ASSERT_EQ(result, NP_LDT_SUCCESS);
+  free(plaintext);
+}
+
+TEST(LdtFfiTests, TestEncryptInvalidLength) {
+  auto plaintext = (uint8_t *)malloc(32 * sizeof(uint8_t));
+  memcpy(plaintext, TEST_DATA_BYTES, 20);
+
+  NpLdtEncryptHandle enc_handle = create_enc_handle_from_test_key();
+  ASSERT_TRUE(enc_handle.handle != 0);
+
+  NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, plaintext, 32, salt);
+  ASSERT_EQ(result, NP_LDT_ERROR_INVALID_LENGTH);
+
+  result = NpLdtEncrypt(enc_handle, plaintext, 15, salt);
+  ASSERT_EQ(result, NP_LDT_ERROR_INVALID_LENGTH);
+  free(plaintext);
+}
+
+TEST(LdtFfiTests, TestDecryptInvalidLength) {
+  auto plaintext = (uint8_t *)malloc(32 * sizeof(uint8_t));
+  memcpy(plaintext, TEST_DATA_BYTES, 20);
+
+  NpLdtDecryptHandle dec_handle = create_dec_handle_from_test_key();
+  ASSERT_TRUE(dec_handle.handle != 0);
+
+  NP_LDT_RESULT result = NpLdtDecryptAndVerify(dec_handle, plaintext, 32, salt);
+  ASSERT_EQ(result, NP_LDT_ERROR_INVALID_LENGTH);
+
+  result = NpLdtDecryptAndVerify(dec_handle, plaintext, 15, salt);
+  ASSERT_EQ(result, NP_LDT_ERROR_INVALID_LENGTH);
+  free(plaintext);
+}
+
+// We want to make sure no decryption is performed when the hmac is invalid
+TEST(LdtFfiTests, TestDecryptMacMismatch) {
+  char test_text[] = "this text should not change!";
+  auto plaintext = (uint8_t *)malloc(30 * sizeof(char));
+  memcpy(plaintext, test_text, 29);
+
+  NpLdtDecryptHandle dec_handle = create_dec_handle_from_test_key();
+  ASSERT_TRUE(dec_handle.handle != 0);
+
+  NP_LDT_RESULT result = NpLdtDecryptAndVerify(dec_handle, plaintext, 24, salt);
+  ASSERT_EQ(result, NP_LDT_ERROR_MAC_MISMATCH);
+
+  ASSERT_EQ(strcmp((char *)plaintext, test_text), 0);
+  free(plaintext);
+}
+
+TEST(LdtFfiTests, TestInvalidHandle) {
+  auto plaintext = (uint8_t *)malloc(20 * sizeof(uint8_t));
+  memcpy(plaintext, TEST_DATA_BYTES, 20);
+
+  NP_LDT_RESULT result =
+      NpLdtEncrypt(NpLdtEncryptHandle{1234}, plaintext, 20, salt);
+  ASSERT_EQ(result, NP_LDT_INVALID_HANDLE);
+
+  result = NpLdtDecryptAndVerify(NpLdtDecryptHandle{1234}, plaintext, 20, salt);
+  ASSERT_EQ(result, NP_LDT_INVALID_HANDLE);
+  free(plaintext);
+
+  result = NpLdtEncryptClose(NpLdtEncryptHandle{1234});
+  ASSERT_EQ(result, NP_LDT_INVALID_HANDLE);
+
+  result = NpLdtDecryptClose(NpLdtDecryptHandle{1234});
+  ASSERT_EQ(result, NP_LDT_INVALID_HANDLE);
+}
+
+#ifndef _WIN32
+pthread_mutex_t my_mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+
+void *worker_thread(void *arg) {
+  (void)arg;
+  pthread_mutex_lock(&my_mutex);
+
+  pthread_cond_wait(&cond, &my_mutex);
+  pthread_mutex_unlock(&my_mutex);
+
+  auto plaintext = (uint8_t *)malloc(20 * sizeof(uint8_t));
+  memcpy(plaintext, TEST_DATA_BYTES, 20);
+
+  NpLdtEncryptHandle enc_handle = create_enc_handle_from_test_key();
+  if (enc_handle.handle == 0) {
+    printf("Error creating handle in thread!");
+    free(plaintext);
+    exit(2);
+  }
+
+  NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, plaintext, 20, salt);
+  if (result != NP_LDT_SUCCESS) {
+    printf("Error in encrypt in thread!");
+    free(plaintext);
+    exit(2);
+  }
+
+  NpLdtDecryptHandle dec_handle = create_dec_handle_from_test_key();
+  if (dec_handle.handle == 0) {
+    printf("Error creating handle in thread!");
+    free(plaintext);
+    exit(2);
+  }
+  result = NpLdtDecryptAndVerify(dec_handle, plaintext, 20, salt);
+  if (result != NP_LDT_SUCCESS) {
+    printf("Error in decrypt in thread!");
+    free(plaintext);
+    exit(2);
+  }
+
+  free(plaintext);
+  pthread_exit(nullptr);
+}
+
+TEST(LdtFfiTests, MultiThreadedTests) {
+  int i, num_threads = 100;
+  pthread_t tid[num_threads];
+  memset(tid, 0, num_threads * sizeof(pthread_t));
+
+  // Create the threads
+  for (i = 0; i < num_threads; i++)
+    ASSERT_EQ(pthread_create(&tid[i], nullptr, worker_thread, (void *)&tid[i]),
+              0);
+
+  // give time for all threads to lock
+  sleep(1);
+
+  // unleash the threads!
+  pthread_cond_broadcast(&cond);
+
+  // Wait for them all to finish and check the status
+  for (i = 0; i < num_threads; i++)
+    ASSERT_EQ(pthread_join(tid[i], nullptr), 0);
+}
+#endif
diff --git a/nearby/presence/ldt_np_c_sample/tests/np_ffi_tests.cc b/nearby/presence/ldt_np_c_sample/tests/np_ffi_tests.cc
deleted file mode 100644
index 6359e7e..0000000
--- a/nearby/presence/ldt_np_c_sample/tests/np_ffi_tests.cc
+++ /dev/null
@@ -1,308 +0,0 @@
-// Copyright 2022 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include <gtest/gtest.h>
-#include <json/json.h>
-
-extern "C" {
-#include "np_ldt.h"
-}
-
-#include <algorithm>
-#include <fstream>
-
-// TODO: get multi threaded tests working on windows
-#ifndef _WIN32
-#include <pthread.h>
-#endif
-
-using namespace std;
-
-#ifdef LDT_TEST_VECTORS
-static const char* PATH_TO_DATA_FILE = LDT_TEST_VECTORS;
-#else
-static const char* PATH_TO_DATA_FILE = "np_adv_test_vectors.json";
-#endif
-static const uint8_t KEY_SEED_BYTES[] = {204, 219, 36, 137, 233, 252, 172, 66, 179, 147, 72, 184, 148, 30, 209, 154, 29, 54, 14, 117, 224, 152, 200, 193, 94, 107, 28, 194, 182, 32, 205, 57};
-static const uint8_t KNOWN_HMAC_BYTES[] = {223, 185, 10, 31, 155, 31, 226, 141, 24, 187, 204, 165, 34, 64, 181, 204, 44, 203, 95, 141, 82, 137, 163, 203, 100, 235, 53, 65, 202, 97, 75, 180};
-static const uint8_t TEST_DATA_BYTES[] = {205, 104, 63, 225, 161, 209, 248, 70, 84, 61, 10, 19, 212, 174, 164, 0, 64, 200, 214, 123};
-
-static NpLdtSalt salt  = {
-    {12, 15}
-};
-
-static NpLdtEncryptHandle create_enc_handle_from_test_key ()
-{
-    NpLdtKeySeed key_seed;
-    memcpy(key_seed.bytes, KEY_SEED_BYTES, 32);
-
-    return NpLdtEncryptCreate(key_seed);
-}
-
-static NpLdtDecryptHandle create_dec_handle_from_test_key ()
-{
-    NpLdtKeySeed key_seed;
-    memcpy(key_seed.bytes, KEY_SEED_BYTES, 32);
-
-    NpMetadataKeyHmac known_hmac;
-    memcpy(known_hmac.bytes, KNOWN_HMAC_BYTES, 32);
-
-    return NpLdtDecryptCreate(key_seed, known_hmac);
-}
-
-static void hex_string_to_bytes(const char * hexString, uint8_t * out, size_t len)
-{
-    for (size_t count = 0; count < len; count++) {
-        sscanf(hexString, "%2hhx", &out[count]);
-        hexString += 2;
-    }
-}
-
-static void bytes_to_hex_string(uint8_t * data, char * out, int len)
-{
-    std::stringstream ss;
-    ss << std::hex;
-    for(int i=0;i<len;++i)
-        ss << std::setw(2) << std::setfill('0') << (int)data[i];
-
-    string result = ss.str();
-    transform(result.begin(), result.end(), result.begin(), ::toupper);
-    strcpy(out, result.c_str());
-}
-
-// Run through JSON data with test cases generated by Rust tests.
-// Using generated data for now because the C layer does not have the ability
-// to generate the ldt_key and hmac_key from a key_seed, this is an implementation
-// detail of the rust ldt library
-TEST(NpFfiTests, TestJsonData) {
-    Json::Value root;
-    Json::Reader reader;
-    std::ifstream test(PATH_TO_DATA_FILE);
-    bool parsingSuccessful = reader.parse( test, root, false );
-    if ( !parsingSuccessful )
-    {
-        std::cout  << reader.getFormattedErrorMessages()
-               << "\n";
-    }
-    ASSERT_TRUE(root.size() == 1000);
-
-    for (Json::Value::ArrayIndex i = 0; i < root.size(); i++) {
-        const Json::Value& v = root[i];
-        auto key_seed = v["key_seed"].asCString();
-        auto metadata_key_hmac = v["metadata_key_hmac"].asCString();
-        auto adv_salt = v["adv_salt"].asCString();
-        auto plaintext = v["plaintext"].asCString();
-        auto ciphertext = v["ciphertext"].asCString();
-
-        NpLdtKeySeed np_key_seed;
-        int len = strlen(key_seed)/2;
-        hex_string_to_bytes(key_seed, np_key_seed.bytes, len);
-        ASSERT_EQ(len, 32);
-
-        NpMetadataKeyHmac known_hmac;
-        len = strlen(metadata_key_hmac)/2;
-        hex_string_to_bytes(metadata_key_hmac, known_hmac.bytes, len);
-        ASSERT_EQ(len, 32);
-
-        NpLdtEncryptHandle enc_handle = NpLdtEncryptCreate(np_key_seed);
-        ASSERT_TRUE(enc_handle.handle != 0);
-
-        NpLdtSalt saltdata;
-        len = strlen(adv_salt)/2;
-        hex_string_to_bytes(adv_salt, saltdata.bytes, len);
-        ASSERT_TRUE(len == 2);
-
-        len = strlen(plaintext)/2;
-        uint8_t* buffer = (uint8_t*)malloc(len);
-        hex_string_to_bytes(plaintext, buffer, len);
-        NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, buffer, len, saltdata);
-        ASSERT_EQ(result, NP_LDT_SUCCESS);
-
-        char output[strlen(plaintext) + 1];
-        bytes_to_hex_string(buffer, output, len);
-        ASSERT_EQ(strcmp(output, ciphertext), 0);
-
-        NpLdtDecryptHandle dec_handle = NpLdtDecryptCreate(np_key_seed, known_hmac);
-        ASSERT_TRUE(dec_handle.handle != 0);
-
-        result = NpLdtDecryptAndVerify(dec_handle, buffer, len, saltdata);
-        ASSERT_EQ(result, NP_LDT_SUCCESS);
-
-        result = NpLdtEncryptClose(enc_handle);
-        ASSERT_EQ(result, NP_LDT_SUCCESS);
-
-        result = NpLdtDecryptClose(dec_handle);
-        ASSERT_EQ(result, NP_LDT_SUCCESS);
-
-        bytes_to_hex_string(buffer, output, len);
-        ASSERT_EQ( strcmp(output, plaintext), 0);
-        free(buffer);
-    }
-    test.close();
-}
-
-TEST(NpFfiTests, TestValidLength)
-{
-    uint8_t* plaintext = (uint8_t*) malloc(20 * sizeof(uint8_t));
-    memcpy(plaintext, TEST_DATA_BYTES, 20);
-
-    NpLdtEncryptHandle enc_handle = create_enc_handle_from_test_key();
-    ASSERT_TRUE(enc_handle.handle != 0);
-
-    NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, plaintext, 20, salt);
-    ASSERT_EQ(result, NP_LDT_SUCCESS);
-
-    NpLdtDecryptHandle dec_handle = create_dec_handle_from_test_key();
-
-    result = NpLdtDecryptAndVerify(dec_handle, plaintext, 20, salt);
-    ASSERT_EQ(result, NP_LDT_SUCCESS);
-    free(plaintext);
-}
-
-TEST(NpFfiTests, TestEncryptInvalidLength)
-{
-    uint8_t* plaintext = (uint8_t*) malloc(32 * sizeof(uint8_t));
-    memcpy(plaintext, TEST_DATA_BYTES, 20);
-
-    NpLdtEncryptHandle enc_handle = create_enc_handle_from_test_key();
-    ASSERT_TRUE(enc_handle.handle != 0);
-
-    NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, plaintext, 32, salt);
-    ASSERT_EQ(result, NP_LDT_ERROR_INVALID_LENGTH);
-
-    result = NpLdtEncrypt(enc_handle, plaintext, 15, salt);
-    ASSERT_EQ(result,  NP_LDT_ERROR_INVALID_LENGTH);
-    free(plaintext);
-}
-
-TEST(NpFfiTests, TestDecryptInvalidLength)
-{
-    uint8_t* plaintext = (uint8_t*) malloc(32 * sizeof(uint8_t));
-    memcpy(plaintext, TEST_DATA_BYTES, 20);
-
-    NpLdtDecryptHandle dec_handle = create_dec_handle_from_test_key();
-    ASSERT_TRUE(dec_handle.handle != 0);
-
-    NP_LDT_RESULT result = NpLdtDecryptAndVerify(dec_handle, plaintext, 32, salt);
-    ASSERT_EQ(result, NP_LDT_ERROR_INVALID_LENGTH);
-
-    result = NpLdtDecryptAndVerify(dec_handle, plaintext, 15, salt);
-    ASSERT_EQ(result, NP_LDT_ERROR_INVALID_LENGTH);
-    free(plaintext);
-}
-
-// We want to make sure no decryption is performed when the hmac is invalid
-TEST(NpFfiTests, TestDecryptMacMismatch)
-{
-    char test_text[] = "this text should not change!";
-    uint8_t* plaintext = (uint8_t*) malloc(30 * sizeof(char));
-    memcpy(plaintext, test_text, 29);
-
-    NpLdtDecryptHandle dec_handle = create_dec_handle_from_test_key();
-    ASSERT_TRUE(dec_handle.handle != 0);
-
-    NP_LDT_RESULT result = NpLdtDecryptAndVerify(dec_handle, plaintext, 24, salt);
-    ASSERT_EQ(result, NP_LDT_ERROR_MAC_MISMATCH);
-
-    ASSERT_EQ(strcmp((char *)plaintext, test_text), 0);
-    free(plaintext);
-}
-
-TEST(NpFfiTests, TestInvalidHandle)
-{
-    uint8_t* plaintext = (uint8_t*) malloc(20 * sizeof(uint8_t));
-    memcpy(plaintext, TEST_DATA_BYTES, 20);
-
-    NP_LDT_RESULT result = NpLdtEncrypt(NpLdtEncryptHandle{1234}, plaintext, 20, salt);
-    ASSERT_EQ(result, NP_LDT_INVALID_HANDLE);
-
-    result = NpLdtDecryptAndVerify(NpLdtDecryptHandle{1234}, plaintext, 20, salt);
-    ASSERT_EQ(result, NP_LDT_INVALID_HANDLE);
-    free(plaintext);
-
-    result = NpLdtEncryptClose(NpLdtEncryptHandle{1234});
-    ASSERT_EQ(result, NP_LDT_INVALID_HANDLE);
-
-    result = NpLdtDecryptClose(NpLdtDecryptHandle{1234});
-    ASSERT_EQ(result, NP_LDT_INVALID_HANDLE);
-}
-
-#ifndef _WIN32
-pthread_mutex_t my_mutex = PTHREAD_MUTEX_INITIALIZER;
-pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
-
-void *worker_thread(void *arg)
-{
-    (void) arg;
-    pthread_mutex_lock(&my_mutex);
-
-    pthread_cond_wait(&cond, &my_mutex);
-    pthread_mutex_unlock(&my_mutex);
-
-    uint8_t* plaintext = (uint8_t*) malloc(20 * sizeof(uint8_t));
-    memcpy(plaintext, TEST_DATA_BYTES, 20);
-
-    NpLdtEncryptHandle enc_handle = create_enc_handle_from_test_key();
-    if (enc_handle.handle == 0){
-        printf("Error creating handle in thread!");
-        free(plaintext);
-        exit(2);
-    }
-
-    NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, plaintext, 20, salt);
-    if (result != NP_LDT_SUCCESS){
-        printf("Error in encrypt in thread!");
-        free(plaintext);
-        exit(2);
-    }
-
-    NpLdtDecryptHandle dec_handle = create_dec_handle_from_test_key();
-    if (dec_handle.handle == 0){
-        printf("Error creating handle in thread!");
-        free(plaintext);
-        exit(2);
-    }
-    result = NpLdtDecryptAndVerify(dec_handle, plaintext, 20, salt);
-    if (result != NP_LDT_SUCCESS){
-        printf("Error in decrypt in thread!");
-        free(plaintext);
-        exit(2);
-    }
-
-    free(plaintext);
-    pthread_exit(NULL);
-}
-
-TEST(NpFfiTests, MultiThreadedTests)
-{
-    int i, num_threads = 100;
-    pthread_t tid[num_threads];
-    memset(tid, 0, num_threads * sizeof(pthread_t));
-
-    // Create the threads
-    for (i = 0; i < num_threads; i++)
-        ASSERT_EQ(pthread_create(&tid[i], NULL, worker_thread, (void *)&tid[i]),
-         0);
-
-    // give time for all threads to lock
-    sleep(1);
-
-    // unleash the threads!
-    pthread_cond_broadcast(&cond);
-
-    // Wait for them all to finish and check the status
-    for (i = 0; i < num_threads; i++)
-        ASSERT_EQ(pthread_join(tid[i], NULL), 0);
-}
-#endif
diff --git a/nearby/presence/ldt_np_jni/src/lib.rs b/nearby/presence/ldt_np_jni/src/lib.rs
index 6415a4f..8f7958e 100644
--- a/nearby/presence/ldt_np_jni/src/lib.rs
+++ b/nearby/presence/ldt_np_jni/src/lib.rs
@@ -235,7 +235,9 @@
         .try_into()
         .map_err(|_| {
             // resuscitate the Box so that its drop can run, otherwise we would leak on error
-            unsafe { Box::from_raw(pointer) };
+            unsafe {
+                let _ = Box::from_raw(pointer);
+            }
         })
         // Now that we know the pointer fits in 64 bits, can cast u64 to i64/jlong.
         .map(|ptr_64: u64| ptr_64 as jlong)
diff --git a/nearby/presence/np_adv/Cargo.toml b/nearby/presence/np_adv/Cargo.toml
new file mode 100644
index 0000000..4c8aff5
--- /dev/null
+++ b/nearby/presence/np_adv/Cargo.toml
@@ -0,0 +1,42 @@
+[package]
+name = "np_adv"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+array_view = { path = "../array_view" }
+ldt_np_adv.workspace = true
+ldt.workspace = true
+np_hkdf.workspace = true
+np_ed25519.workspace = true
+xts_aes.workspace = true
+crypto_provider.workspace = true
+strum.workspace = true
+strum_macros.workspace = true
+nom = { version = "7.1.1", features = ["alloc"] }
+lazy_static.workspace = true
+sink.workspace = true
+tinyvec.workspace = true
+rand.workspace = true
+
+[features]
+default = []
+devtools = []
+testing = []
+
+[dev-dependencies]
+hex.workspace = true
+rand_ext = { path = "../rand_ext" }
+init_with = "1.1.0"
+serde_json.workspace = true
+anyhow.workspace = true
+test_helper = { path = "../test_helper" }
+criterion.workspace = true
+crypto_provider_default = {workspace = true, features = ["std", "rustcrypto"]}
+np_ed25519 = {workspace = true, features = ["std"]}
+sink = {workspace = true, features = ["std"]}
+
+[[bench]]
+name = "deser_adv"
+harness = false
diff --git a/nearby/presence/np_adv/benches/deser_adv.rs b/nearby/presence/np_adv/benches/deser_adv.rs
new file mode 100644
index 0000000..9699ebf
--- /dev/null
+++ b/nearby/presence/np_adv/benches/deser_adv.rs
@@ -0,0 +1,422 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use core::marker::PhantomData;
+use criterion::{black_box, criterion_group, criterion_main, Bencher, Criterion};
+use crypto_provider::{CryptoProvider, CryptoRng};
+use crypto_provider_default::CryptoProviderImpl;
+use ldt_np_adv::{LdtEncrypterXtsAes128, LegacySalt};
+
+use np_adv::{
+    credential::{simple::*, source::*, v0::*, v1::*},
+    de_type::EncryptedIdentityDataElementType,
+    deserialize_advertisement, deserialize_v0_advertisement, deserialize_v1_advertisement,
+    extended::{
+        data_elements::{GenericDataElement, TxPowerDataElement},
+        deserialize::VerificationMode,
+        serialize::{
+            AdvBuilder as ExtendedAdvBuilder, MicEncrypted, SectionBuilder, SectionIdentity,
+            SignedEncrypted,
+        },
+    },
+    legacy::{
+        actions::{ActionBits, ActionsDataElement},
+        serialize::{AdvBuilder as LegacyAdvBuilder, LdtIdentity},
+    },
+    shared_data::{ContextSyncSeqNum, TxPower},
+    PublicIdentity,
+};
+use rand::{Rng as _, SeedableRng as _};
+use strum::IntoEnumIterator;
+
+pub fn deser_adv_v1_encrypted(c: &mut Criterion) {
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+
+    for crypto_type in CryptoMaterialType::iter() {
+        for &identity_type in &[VerificationMode::Mic, VerificationMode::Signature] {
+            for &num_identities in &[10, 100, 1000] {
+                for &num_sections in &[1, 2] {
+                    // measure worst-case performance -- the correct identities will be the last
+                    // num_sections of the identities to be tried
+                    c.bench_function(
+                        &format!(
+                            "Deser V1 encrypted: crypto={crypto_type:?}/mode={identity_type:?}/ids={num_identities}/sections={num_sections}"
+                        ),
+                        |b| {
+                            let identities = (0..num_identities)
+                                .map(|_| V1Identity::random(&mut crypto_rng))
+                                .collect::<Vec<_>>();
+
+                            let mut adv_builder = ExtendedAdvBuilder::new();
+
+                            // take the first n identities, one section per identity
+                            for identity in identities.iter().take(num_sections) {
+                                let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(
+                                    &identity.key_seed,
+                                );
+                                match identity_type {
+                                    VerificationMode::Mic => {
+                                        let mut sb = adv_builder
+                                            .section_builder(MicEncrypted::new_random_salt(
+                                                &mut crypto_rng,
+                                                EncryptedIdentityDataElementType::Private,
+                                                &identity.extended_metadata_key,
+                                                &hkdf,
+                                            ))
+                                            .unwrap();
+
+                                        add_des(&mut sb);
+                                        sb.add_to_advertisement();
+                                    }
+                                    VerificationMode::Signature => {
+                                        let mut sb = adv_builder
+                                            .section_builder(SignedEncrypted::new_random_salt(
+                                                &mut crypto_rng,
+                                                EncryptedIdentityDataElementType::Private,
+                                                &identity.extended_metadata_key,
+                                                &identity.key_pair,
+                                                &hkdf,
+                                            ))
+                                            .unwrap();
+
+                                        add_des(&mut sb);
+                                        sb.add_to_advertisement();
+                                    }
+                                }
+                            }
+
+                            let adv = adv_builder.into_advertisement();
+
+                            match crypto_type {
+                                CryptoMaterialType::MinFootprint => run_with_v1_creds::<
+                                    MinimumFootprintV1CryptoMaterial,
+                                    CryptoProviderImpl,
+                                >(
+                                    b, identities, adv.as_slice()
+                                ),
+                                CryptoMaterialType::Precalculated => {
+                                    run_with_v1_creds::<
+                                        PrecalculatedV1CryptoMaterial,
+                                        CryptoProviderImpl,
+                                    >(
+                                        b, identities, adv.as_slice()
+                                    )
+                                }
+                            }
+                        },
+                    );
+                }
+            }
+        }
+    }
+}
+
+pub fn deser_adv_v1_plaintext(c: &mut Criterion) {
+    let _rng = rand::rngs::StdRng::from_entropy();
+
+    for &num_sections in &[1, 2, 5, 8] {
+        // measure worst-case performance -- the correct identities will be the last
+        // num_sections of the identities to be tried
+        c.bench_function(&format!("Deser V1 plaintext: sections={num_sections}"), |b| {
+            let mut adv_builder = ExtendedAdvBuilder::new();
+
+            // take the first n identities, one section per identity
+            for _ in 0..num_sections {
+                let mut sb = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+                add_des(&mut sb);
+                sb.add_to_advertisement();
+            }
+
+            let adv = adv_builder.into_advertisement();
+
+            run_with_v1_creds::<MinimumFootprintV1CryptoMaterial, CryptoProviderImpl>(
+                b,
+                vec![],
+                adv.as_slice(),
+            )
+        });
+    }
+}
+
+pub fn deser_adv_v0_encrypted(c: &mut Criterion) {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+    for crypto_type in CryptoMaterialType::iter() {
+        for &num_identities in &[10, 100, 1000] {
+            // measure worst-case performance -- the correct identities will be the last
+            // num_sections of the identities to be tried
+            c.bench_function(
+                &format!("Deser V0 encrypted: crypto={crypto_type:?}/ids={num_identities}"),
+                |b| {
+                    let identities = (0..num_identities)
+                        .map(|_| V0Identity::random(&mut rng))
+                        .collect::<Vec<_>>();
+
+                    let identity = &identities[0];
+                    let hkdf =
+                        np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&identity.key_seed);
+
+                    let mut adv_builder =
+                        LegacyAdvBuilder::new(LdtIdentity::<CryptoProviderImpl>::new(
+                            EncryptedIdentityDataElementType::Private,
+                            LegacySalt::from(rng.gen::<[u8; 2]>()),
+                            identity.legacy_metadata_key,
+                            LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(
+                                &hkdf.legacy_ldt_key(),
+                            ),
+                        ));
+
+                    let mut action_bits = ActionBits::default();
+                    action_bits.set_action(ContextSyncSeqNum::try_from(3).unwrap());
+                    adv_builder.add_data_element(ActionsDataElement::from(action_bits)).unwrap();
+
+                    let adv = adv_builder.into_advertisement().unwrap();
+
+                    match crypto_type {
+                        CryptoMaterialType::MinFootprint => run_with_v0_creds::<
+                            MinimumFootprintV0CryptoMaterial,
+                            CryptoProviderImpl,
+                        >(
+                            b, identities, adv.as_slice()
+                        ),
+                        CryptoMaterialType::Precalculated => run_with_v0_creds::<
+                            PrecalculatedV0CryptoMaterial,
+                            CryptoProviderImpl,
+                        >(
+                            b, identities, adv.as_slice()
+                        ),
+                    }
+                },
+            );
+        }
+    }
+}
+
+type DefaultV0Credential = np_adv::credential::simple::SimpleV0Credential<
+    np_adv::credential::v0::MinimumFootprintV0CryptoMaterial,
+    (),
+>;
+type DefaultV1Credential = np_adv::credential::simple::SimpleV1Credential<
+    np_adv::credential::v1::MinimumFootprintV1CryptoMaterial,
+    (),
+>;
+type DefaultBothCredentialSource =
+    np_adv::credential::source::OwnedBothCredentialSource<DefaultV0Credential, DefaultV1Credential>;
+
+pub fn deser_adv_v0_plaintext(c: &mut Criterion) {
+    let mut adv_builder = LegacyAdvBuilder::new(PublicIdentity::default());
+
+    let mut action_bits = ActionBits::default();
+    action_bits.set_action(ContextSyncSeqNum::try_from(3).unwrap());
+    adv_builder.add_data_element(ActionsDataElement::from(action_bits)).unwrap();
+    let adv = adv_builder.into_advertisement().unwrap();
+
+    let cred_source: DefaultBothCredentialSource = DefaultBothCredentialSource::new_empty();
+
+    for &num_advs in &[1, 10, 100, 1000] {
+        c.bench_function(
+            format!("Deser V0 plaintext with {num_advs} advertisements").as_str(),
+            |b| {
+                b.iter(|| {
+                    for _ in 0..num_advs {
+                        black_box(
+                            deserialize_advertisement::<_, _, _, _, CryptoProviderImpl>(
+                                black_box(adv.as_slice()),
+                                black_box(&cred_source),
+                            )
+                            .expect("Should succeed"),
+                        );
+                    }
+                })
+            },
+        );
+    }
+}
+
+/// Benchmark decrypting a V0 advertisement with credentials built from the reversed list of
+/// identities
+fn run_with_v0_creds<M, C>(b: &mut Bencher, identities: Vec<V0Identity<C>>, adv: &[u8])
+where
+    M: V0CryptoMaterialExt,
+    C: CryptoProvider,
+{
+    let mut creds = identities
+        .into_iter()
+        .map(|i| {
+            let hkdf = np_hkdf::NpKeySeedHkdf::<C>::new(&i.key_seed);
+            SimpleV0Credential::new(
+                M::build_cred::<C>(
+                    i.key_seed,
+                    hkdf.legacy_metadata_key_hmac_key().calculate_hmac(&i.legacy_metadata_key),
+                ),
+                i.key_seed,
+            )
+        })
+        .collect::<Vec<_>>();
+
+    // reverse the identities so that we're scanning to the end of the
+    // cred source for predictably bad performance
+    creds.reverse();
+
+    let cred_source = SliceCredentialSource::new(&creds);
+    b.iter(|| {
+        black_box(deserialize_v0_advertisement::<_, _, C>(adv, &cred_source).map(|_| 0_u8).unwrap())
+    });
+}
+
+/// Benchmark decrypting a V1 advertisement with credentials built from the reversed list of
+/// identities
+fn run_with_v1_creds<M, C>(b: &mut Bencher, identities: Vec<V1Identity<C>>, adv: &[u8])
+where
+    M: V1CryptoMaterialExt,
+    C: CryptoProvider,
+{
+    let mut creds = identities
+        .into_iter()
+        .map(|i| {
+            let hkdf = np_hkdf::NpKeySeedHkdf::<C>::new(&i.key_seed);
+            SimpleV1Credential::new(
+                M::build_cred::<C>(
+                    i.key_seed,
+                    hkdf.extended_unsigned_metadata_key_hmac_key()
+                        .calculate_hmac(&i.extended_metadata_key),
+                    hkdf.extended_signed_metadata_key_hmac_key()
+                        .calculate_hmac(&i.extended_metadata_key),
+                    i.key_pair.public(),
+                ),
+                i.key_seed,
+            )
+        })
+        .collect::<Vec<_>>();
+
+    // reverse the identities so that we're scanning to the end of the
+    // cred source for predictably bad performance
+    creds.reverse();
+
+    let cred_source = SliceCredentialSource::new(&creds);
+    b.iter(|| {
+        black_box(deserialize_v1_advertisement::<_, _, C>(adv, &cred_source).map(|_| 0_u8).unwrap())
+    });
+}
+fn add_des<I: SectionIdentity>(sb: &mut SectionBuilder<I>) {
+    sb.add_de_res(|_| TxPower::try_from(17).map(TxPowerDataElement::from)).unwrap();
+    sb.add_de_res(|_| GenericDataElement::try_from(100_u32.into(), &[0; 10])).unwrap();
+}
+criterion_group!(
+    benches,
+    deser_adv_v1_encrypted,
+    deser_adv_v1_plaintext,
+    deser_adv_v0_encrypted,
+    deser_adv_v0_plaintext
+);
+criterion_main!(benches);
+
+struct V0Identity<C: CryptoProvider> {
+    key_seed: [u8; 32],
+    legacy_metadata_key: [u8; 14],
+    _marker: PhantomData<C>,
+}
+
+impl<C: CryptoProvider> V0Identity<C> {
+    /// Generate a new identity with random crypto material
+    fn random<R: rand::Rng + rand::CryptoRng>(rng: &mut R) -> Self {
+        Self { key_seed: rng.gen(), legacy_metadata_key: rng.gen(), _marker: PhantomData }
+    }
+}
+
+struct V1Identity<C: CryptoProvider> {
+    key_seed: [u8; 32],
+    extended_metadata_key: [u8; 16],
+    key_pair: np_ed25519::KeyPair<C>,
+}
+
+impl<C: CryptoProvider> V1Identity<C> {
+    /// Generate a new identity with random crypto material
+    fn random(rng: &mut C::CryptoRng) -> Self {
+        Self {
+            key_seed: rng.gen(),
+            extended_metadata_key: rng.gen(),
+            key_pair: np_ed25519::KeyPair::<C>::generate(),
+        }
+    }
+}
+
+#[derive(strum_macros::EnumIter, Debug)]
+enum CryptoMaterialType {
+    MinFootprint,
+    Precalculated,
+}
+
+// if we get confident this is a valid shared way, could move this to the main trait
+trait V0CryptoMaterialExt: V0CryptoMaterial {
+    fn build_cred<C: CryptoProvider>(
+        key_seed: [u8; 32],
+        legacy_metadata_key_hmac: [u8; 32],
+    ) -> Self;
+}
+
+trait V1CryptoMaterialExt: V1CryptoMaterial {
+    fn build_cred<C: CryptoProvider>(
+        key_seed: [u8; 32],
+        unsigned_metadata_key_hmac: [u8; 32],
+        signed_metadata_key_hmac: [u8; 32],
+        pub_key: np_ed25519::PublicKey<C>,
+    ) -> Self;
+}
+
+impl V0CryptoMaterialExt for MinimumFootprintV0CryptoMaterial {
+    fn build_cred<C: CryptoProvider>(
+        key_seed: [u8; 32],
+        legacy_metadata_key_hmac: [u8; 32],
+    ) -> Self {
+        Self::new(key_seed, legacy_metadata_key_hmac)
+    }
+}
+
+impl V0CryptoMaterialExt for PrecalculatedV0CryptoMaterial {
+    fn build_cred<C: CryptoProvider>(
+        key_seed: [u8; 32],
+        legacy_metadata_key_hmac: [u8; 32],
+    ) -> Self {
+        Self::new::<C>(&key_seed, legacy_metadata_key_hmac)
+    }
+}
+
+impl V1CryptoMaterialExt for MinimumFootprintV1CryptoMaterial {
+    fn build_cred<C: CryptoProvider>(
+        key_seed: [u8; 32],
+        unsigned_metadata_key_hmac: [u8; 32],
+        signed_metadata_key_hmac: [u8; 32],
+        pub_key: np_ed25519::PublicKey<C>,
+    ) -> Self {
+        Self::new(key_seed, unsigned_metadata_key_hmac, signed_metadata_key_hmac, pub_key)
+    }
+}
+
+impl V1CryptoMaterialExt for PrecalculatedV1CryptoMaterial {
+    fn build_cred<C: CryptoProvider>(
+        key_seed: [u8; 32],
+        unsigned_metadata_key_hmac: [u8; 32],
+        signed_metadata_key_hmac: [u8; 32],
+        pub_key: np_ed25519::PublicKey<C>,
+    ) -> Self {
+        let min_foot = MinimumFootprintV1CryptoMaterial::new(
+            key_seed,
+            unsigned_metadata_key_hmac,
+            signed_metadata_key_hmac,
+            pub_key,
+        );
+        min_foot.to_precalculated::<C>()
+    }
+}
diff --git a/nearby/presence/np_adv/resources/test/mic-encrypted-test-vectors.json b/nearby/presence/np_adv/resources/test/mic-encrypted-test-vectors.json
new file mode 100644
index 0000000..a7834ec
--- /dev/null
+++ b/nearby/presence/np_adv/resources/test/mic-encrypted-test-vectors.json
@@ -0,0 +1,2295 @@
+[
+  {
+    "adv_header_byte": "20",
+    "aes_key": "F3DB017C70E08EC5178C92F3AEA0C362",
+    "data_elements": [
+      {
+        "contents": "CF75D23EDA8F6E4A23",
+        "de_type": 383
+      },
+      {
+        "contents": "731B76151735869205CC41",
+        "de_type": 73
+      },
+      {
+        "contents": "7C2A8DE86B2CBB997703",
+        "de_type": 228
+      },
+      {
+        "contents": "99F5163DCA0BB9BE89755A6C5AB321",
+        "de_type": 446
+      }
+    ],
+    "encoded_section": "6D91100056F596D16E1F87B107EE86102FFC6D5E9002F00C41CDDF533667362CD14AC54A9388FA3D30AA7CA6603071B8B0FA19BF582479F773F1C7D0EADF98E98B9447139F244D571B780475ACD9CB248F33B2C085925213360732D44081C27CA6EB40BD8A626BC776D88C5FDB09",
+    "identity_type": "trusted",
+    "key_seed": "F0ED9126768CE7DC685FF74932AC5A876442C4E42359A43F720A575142A45043",
+    "metadata_key": "45795EE4C6533A830886E2C5885EB9E5",
+    "nonce": "40E95D525FAEA1C1FEE39A8E",
+    "section_mic_hmac_key": "A22386E85112EF883218A5B75669B7102E017E9AA149F408A079F60B1D14B4F4",
+    "section_salt": "56F596D16E1F87B107EE86102FFC6D5E"
+  },
+  {
+    "adv_header_byte": "20",
+    "aes_key": "F076F2B4FA1F3704DDC4EC5CD60C4657",
+    "data_elements": [
+      {
+        "contents": "B62889",
+        "de_type": 72
+      },
+      {
+        "contents": "68FDB8895CB7ABCF18390616113107B73321A905D22FDB99",
+        "de_type": 175
+      },
+      {
+        "contents": "D5A173DC337EFA759D443C50F14F25AC18A06D44C4",
+        "de_type": 354
+      }
+    ],
+    "encoded_section": "6D911000CB9C39FAF5D89CEF1FD7E313DC2F95D79004919332D945C714DE3B58B0762E7F9378D80F35D0DE1E8BD321656B270EA3379F029FB09E44AAFB091B0678A0AB69B055CCE5C2F576EAE52DAC0D6C11FD6A878ABF337B9647FF259ED24F5687641E8ED13A612810F22EC240",
+    "identity_type": "provisioned",
+    "key_seed": "907E34F78FBC8CA40FCA224C12B95BA2C4A0148BA0D19BDADEE1798579EF7D35",
+    "metadata_key": "B524D8ABD8E7DCFD13CE922F2FD9EFAC",
+    "nonce": "AD0AC7BE3A89262786A55139",
+    "section_mic_hmac_key": "690542812A39DB48DD638AED6021A250767F79604C638E361A8F7F5FE92C5E40",
+    "section_salt": "CB9C39FAF5D89CEF1FD7E313DC2F95D7"
+  },
+  {
+    "adv_header_byte": "20",
+    "aes_key": "B9549633BA2531AEF16D592815C12269",
+    "data_elements": [
+      {
+        "contents": "BA",
+        "de_type": 79
+      },
+      {
+        "contents": "796F131D0D034508",
+        "de_type": 141
+      },
+      {
+        "contents": "0245",
+        "de_type": 522
+      }
+    ],
+    "encoded_section": "48911000897E4DB6C940976334871B64811D8379900416AC9B5760E31F037634EED3B9C81AEF75B5134E7065DCEFF8CF3197BD2242BE4E29384125B35FB9A4BB7D4D1A650F1E30DBA3",
+    "identity_type": "provisioned",
+    "key_seed": "E66AECA540D070C5E430CE461A3E209F0650AAF3E69CC79C20935DEA3D468A46",
+    "metadata_key": "B2AC31CB7B88B7FA165B5E41AE706E04",
+    "nonce": "E3CB89790FEA866E19F4926A",
+    "section_mic_hmac_key": "EE72E920E379F06879BD8AED8EF9BF8D5903E5CF94A83815929260521F84C17C",
+    "section_salt": "897E4DB6C940976334871B64811D8379"
+  },
+  {
+    "adv_header_byte": "20",
+    "aes_key": "088B6339D6D727E797DD1EA3EAC999B3",
+    "data_elements": [
+      {
+        "contents": "DDCCC496B0BE050B7607",
+        "de_type": 850
+      }
+    ],
+    "encoded_section": "429110008F292492B012ACE2C0EF4F25E0901F9490022CF669461319C1165AA131A7BF2835C97FC3ECD77522FB93CE0675D0313D7AB03E230DBE46E286192CD451E9FF",
+    "identity_type": "trusted",
+    "key_seed": "CB61506281210764CE5E3504BF3A41AF69196369375BFE16245B0CA19421650D",
+    "metadata_key": "B9696864507A1DC2EF99DF5441AD25EF",
+    "nonce": "9CC88703DA8A3C82DA5DF32D",
+    "section_mic_hmac_key": "8DE5B98089EEEAB5ABB079EE0C6C8F37289CFCDA74B81BE4F3599EA7F10B3A3C",
+    "section_salt": "8F292492B012ACE2C0EF4F25E0901F94"
+  },
+  {
+    "adv_header_byte": "20",
+    "aes_key": "142EF4EFAA03C54D43958647B4A9053A",
+    "data_elements": [
+      {
+        "contents": "B8E42416CD4B3281EE2EDB1B36B89DFD17D35C46B354D6",
+        "de_type": 441
+      },
+      {
+        "contents": "72787349FDC162A25D13BA",
+        "de_type": 664
+      },
+      {
+        "contents": "E0A29FC658F199AFF9",
+        "de_type": 308
+      },
+      {
+        "contents": "8859EB742D3B433BD0F992285B9EEAA1",
+        "de_type": 319
+      }
+    ],
+    "encoded_section": "7C911000DFCC6FC56956B0D99F2F29682117B0759004E48F8DE2D74AC7FEAFBEA42F808B4DCE7D17F2841097DA561701AF9F365BA4F702A4CA79D40F6F88C383487B6524BFACDDF294D2DE20CCD7B2BF3A765598144323933CEAD4C1A5C6522A867A5BFDF562A43C537A50A3987AB4F9AE446043117F7A20E1C41B398F",
+    "identity_type": "provisioned",
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+      }
+    ],
+    "encoded_section": "6F911000BE86E394E730BAE02E2A22E8B54CF1A4900408EB6891543847E08002B13233D680C89B22F57320B4890E87533A2B4DFC30021206330351F378D93A7CE5051655B1EC84F8F4F68DBB327EDD4E0DA4948323F1B931733AA4D28F06238FF3622178015BB5C709094AC23A3E448D",
+    "identity_type": "provisioned",
+    "key_seed": "CFBB3B4D111CDF95E4AA9642D5D6C1611B8522D6F76C7B1F23C09DCE58133FE2",
+    "metadata_key": "3BFA93FB827970E4CD401DD9903ABF19",
+    "nonce": "2CFBAEDFFF07C80511FE4B1B",
+    "section_mic_hmac_key": "16B7AD3BB2B10A5B5D64ACEB9733BEDC6D0FD351E5D12AB36FF5FB283DEDF3F4",
+    "section_salt": "BE86E394E730BAE02E2A22E8B54CF1A4"
+  }
+]
\ No newline at end of file
diff --git a/nearby/presence/np_adv/src/credential/mod.rs b/nearby/presence/np_adv/src/credential/mod.rs
new file mode 100644
index 0000000..a138f0b
--- /dev/null
+++ b/nearby/presence/np_adv/src/credential/mod.rs
@@ -0,0 +1,85 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Credential types used in deserialization.
+//!
+//! While simple implementations are provided to get started with, there is likely opportunity for
+//! efficiency gains with implementations tailored to suit (e.g. caching a few hot credentials
+//! rather than reading from disk every time, etc).
+
+use core::fmt::Debug;
+use crypto_provider::CryptoProvider;
+
+use self::{
+    simple::{SimpleV0Credential, SimpleV1Credential},
+    source::OwnedBothCredentialSource,
+    v0::MinimumFootprintV0CryptoMaterial,
+    v1::MinimumFootprintV1CryptoMaterial,
+};
+
+pub mod simple;
+pub mod source;
+pub mod v0;
+pub mod v1;
+
+/// A credential which has an associated [`MatchedCredential`]
+pub trait MatchableCredential {
+    /// The [MatchedCredential] provided by this [`MatchableCredential`].
+    type Matched<'m>: MatchedCredential<'m>
+    where
+        Self: 'm;
+
+    /// Returns the subset of credential data that should be associated with a successfully
+    /// decrypted advertisement or advertisement section.
+    fn matched(&self) -> Self::Matched<'_>;
+}
+
+/// Convenient type-level function for referring to the match data for a [`MatchableCredential`].
+pub type MatchedCredFromCred<'s, C> = <C as MatchableCredential>::Matched<'s>;
+
+/// The portion of a credential's data to be bundled with the advertisement content it was used to
+/// decrypt.
+///
+/// As it is `Debug` and `Eq`, implementors should not hold any cryptographic material to avoid
+/// accidental logging, timing side channels on comparison, etc, or should use custom impls of
+/// those traits rather than deriving them.
+pub trait MatchedCredential<'m>: Debug + PartialEq + Eq {}
+
+/// A V0 credential containing some [`v0::V0CryptoMaterial`]
+pub trait V0Credential: MatchableCredential {
+    /// The [v0::V0CryptoMaterial] provided by this V0Credential impl.
+    type CryptoMaterial: v0::V0CryptoMaterial;
+
+    /// Returns the crypto material associated with the credential.
+    ///
+    /// Used to decrypted encrypted advertisement content.
+    fn crypto_material(&self) -> &Self::CryptoMaterial;
+}
+
+/// A V1 credential containing some [`v1::V1CryptoMaterial`]
+pub trait V1Credential: MatchableCredential {
+    /// The [v1::V1CryptoMaterial] provided by this Credential impl.
+    type CryptoMaterial: v1::V1CryptoMaterial;
+
+    /// Returns the crypto material associated with the credential.
+    ///
+    /// Used to decrypt encrypted advertisement content.
+    fn crypto_material(&self) -> &Self::CryptoMaterial;
+}
+
+/// An owned credential store that contains minimum footprint crypto materials
+pub type MinimumFootprintCredentialSource<T> = OwnedBothCredentialSource<
+    SimpleV0Credential<MinimumFootprintV0CryptoMaterial, T>,
+    SimpleV1Credential<MinimumFootprintV1CryptoMaterial, T>,
+>;
diff --git a/nearby/presence/np_adv/src/credential/simple.rs b/nearby/presence/np_adv/src/credential/simple.rs
new file mode 100644
index 0000000..6ea2436
--- /dev/null
+++ b/nearby/presence/np_adv/src/credential/simple.rs
@@ -0,0 +1,148 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Simple implementations of credentials. These can be combined with the provided crypto material
+//! implementations to have a working credential type.
+//!
+//! ```rust
+//! use np_adv::credential::{
+//!     simple::SimpleV0Credential,
+//!     v0::MinimumFootprintV0CryptoMaterial,
+//! };
+//! type MyV0Credential = SimpleV0Credential<MinimumFootprintV0CryptoMaterial, ()>;
+//! ```
+
+use core::fmt::Debug;
+
+use super::*;
+use super::{v0::*, v1::*};
+
+/// A simple implementation of [`V0Credential`] that wraps a [`V0CryptoMaterial`] and some `T` data that
+/// will be exposed via the [`MatchedCredential`].
+pub struct SimpleV0Credential<C, T>
+where
+    C: V0CryptoMaterial,
+    T: Debug + Eq,
+{
+    material: C,
+    match_data: T,
+}
+
+impl<C, T> SimpleV0Credential<C, T>
+where
+    C: V0CryptoMaterial,
+    T: Debug + Eq,
+{
+    /// Construct a new credential.
+    ///
+    /// `material` will be returned by [V0Credential::crypto_material].
+    /// `match_data` will be returned by [SimpleV0Credential::matched], wrapped in [SimpleMatchedCredential].
+    pub fn new(material: C, match_data: T) -> Self {
+        Self { material, match_data }
+    }
+}
+
+impl<C, T> MatchableCredential for SimpleV0Credential<C, T>
+where
+    C: V0CryptoMaterial,
+    T: Debug + Eq,
+{
+    type Matched<'m> = SimpleMatchedCredential<'m, T> where Self: 'm;
+
+    fn matched(&'_ self) -> Self::Matched<'_> {
+        SimpleMatchedCredential { data: &self.match_data }
+    }
+}
+
+impl<C, T> V0Credential for SimpleV0Credential<C, T>
+where
+    C: V0CryptoMaterial,
+    T: Debug + Eq,
+{
+    type CryptoMaterial = C;
+
+    fn crypto_material(&self) -> &Self::CryptoMaterial {
+        &self.material
+    }
+}
+
+/// A simple implementation of [V1Credential] that wraps a [V1CryptoMaterial] and some `T` data that
+/// will be exposed via the [MatchedCredential].
+pub struct SimpleV1Credential<C, T>
+where
+    C: V1CryptoMaterial,
+    T: Debug + Eq,
+{
+    material: C,
+    match_data: T,
+}
+
+impl<C, T> SimpleV1Credential<C, T>
+where
+    C: V1CryptoMaterial,
+    T: Debug + Eq,
+{
+    /// Construct a new credential.
+    ///
+    /// `material` will be returned by [V1Credential::crypto_material].
+    /// `match_data` will be returned by [SimpleV1Credential::matched], wrapped in [SimpleMatchedCredential].
+    pub fn new(material: C, match_data: T) -> Self {
+        Self { material, match_data }
+    }
+}
+
+impl<C, T> MatchableCredential for SimpleV1Credential<C, T>
+where
+    C: V1CryptoMaterial,
+    T: Debug + Eq,
+{
+    type Matched<'m> = SimpleMatchedCredential<'m, T> where Self: 'm;
+
+    fn matched(&'_ self) -> Self::Matched<'_> {
+        SimpleMatchedCredential { data: &self.match_data }
+    }
+}
+
+impl<C, T> V1Credential for SimpleV1Credential<C, T>
+where
+    C: V1CryptoMaterial,
+    T: Debug + Eq,
+{
+    type CryptoMaterial = C;
+
+    fn crypto_material(&self) -> &Self::CryptoMaterial {
+        &self.material
+    }
+}
+
+/// The [MatchedCredential] used by [SimpleV0Credential]
+/// and by [SimpleV1Credential].
+#[derive(Debug, PartialEq, Eq)]
+pub struct SimpleMatchedCredential<'m, T: Debug + PartialEq + Eq> {
+    data: &'m T,
+}
+
+impl<'m, T: Debug + PartialEq + Eq> SimpleMatchedCredential<'m, T> {
+    /// Construct a new instance that wraps `data`.
+    pub fn new(data: &'m T) -> Self {
+        Self { data }
+    }
+
+    /// Returns the underlying matched credential data.
+    pub fn matched_data(&self) -> &'m T {
+        self.data
+    }
+}
+
+impl<'m, T: Debug + PartialEq + Eq> MatchedCredential<'m> for SimpleMatchedCredential<'m, T> {}
diff --git a/nearby/presence/np_adv/src/credential/source.rs b/nearby/presence/np_adv/src/credential/source.rs
new file mode 100644
index 0000000..e102b7e
--- /dev/null
+++ b/nearby/presence/np_adv/src/credential/source.rs
@@ -0,0 +1,150 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Traits defining sources for credentials. These are used in the deserialization path to provide
+//! the credentials to try. [`SliceCredentialSource`] and [`OwnedCredentialSource`] implementations
+//! are also defined in this module.
+
+use super::*;
+use alloc::vec::Vec;
+
+/// A source of credentials to try when decrypting advertisements,
+/// which really just wraps an iterator over a given credential type.
+pub trait CredentialSource<C: MatchableCredential> {
+    /// The iterator type produced that emits credentials
+    type Iterator<'a>: Iterator<Item = &'a C>
+    where
+        Self: 'a,
+        C: 'a;
+
+    /// Iterate over the available credentials
+    fn iter(&self) -> Self::Iterator<'_>;
+}
+
+/// Trait for combined credential sources able to yield credential sources for both V0 and V1.
+pub trait BothCredentialSource<C0, C1>
+where
+    C0: V0Credential,
+    C1: V1Credential,
+{
+    /// The type of the underlying credential-source for v0 credentials
+    type V0Source: CredentialSource<C0>;
+    /// The type of the underlying credential-source for v1 credentials
+    type V1Source: CredentialSource<C1>;
+
+    /// Gets a source for v0 credentials maintained by this `BothCredentialSource`.
+    fn v0(&self) -> &Self::V0Source;
+
+    /// Gets a source for v1 credentials maintained by this `BothCredentialSource`.
+    fn v1(&self) -> &Self::V1Source;
+
+    /// Convenient function alias to [`self.v0().iter()`] for iterating
+    /// over v0 credentials.
+    fn iter_v0(&self) -> <Self::V0Source as CredentialSource<C0>>::Iterator<'_> {
+        self.v0().iter()
+    }
+
+    /// Convenient function alias to the [`CredentialSource<C1>#iter()`] for iterating
+    /// over v0 credentials.
+    fn iter_v1(&self) -> <Self::V1Source as CredentialSource<C1>>::Iterator<'_> {
+        self.v1().iter()
+    }
+}
+
+/// A simple [CredentialSource] that just iterates over a provided slice of credentials
+pub struct SliceCredentialSource<'c, C: MatchableCredential> {
+    credentials: &'c [C],
+}
+
+impl<'c, C: MatchableCredential> SliceCredentialSource<'c, C> {
+    /// Construct the credential source from the provided credentials.
+    pub fn new(credentials: &'c [C]) -> Self {
+        Self { credentials }
+    }
+}
+
+impl<'c, C: MatchableCredential> CredentialSource<C> for SliceCredentialSource<'c, C> {
+    type Iterator<'i>  = core::slice::Iter<'i, C>
+    where Self: 'i;
+
+    fn iter(&'_ self) -> Self::Iterator<'_> {
+        self.credentials.iter()
+    }
+}
+
+/// A simple credential source which owns all of its credentials.
+pub struct OwnedCredentialSource<C: MatchableCredential> {
+    credentials: Vec<C>,
+}
+
+impl<C: MatchableCredential> OwnedCredentialSource<C> {
+    /// Constructs an owned credential source from the given credentials
+    pub fn new(credentials: Vec<C>) -> Self {
+        Self { credentials }
+    }
+}
+
+impl<C: MatchableCredential> CredentialSource<C> for OwnedCredentialSource<C> {
+    type Iterator<'i>  = core::slice::Iter<'i, C>
+    where Self: 'i;
+
+    fn iter(&'_ self) -> Self::Iterator<'_> {
+        self.credentials.iter()
+    }
+}
+
+/// An owned credential source for both v0 and v1 credentials,
+pub struct OwnedBothCredentialSource<C0, C1>
+where
+    C0: V0Credential,
+    C1: V1Credential,
+{
+    v0_source: OwnedCredentialSource<C0>,
+    v1_source: OwnedCredentialSource<C1>,
+}
+
+impl<C0, C1> OwnedBothCredentialSource<C0, C1>
+where
+    C0: V0Credential,
+    C1: V1Credential,
+{
+    /// Creates a new `OwnedBothCredentialSource` from credential-lists
+    /// for both V0 and V1
+    pub fn new(v0_credentials: Vec<C0>, v1_credentials: Vec<C1>) -> Self {
+        let v0_source = OwnedCredentialSource::new(v0_credentials);
+        let v1_source = OwnedCredentialSource::new(v1_credentials);
+        Self { v0_source, v1_source }
+    }
+
+    /// Creates a new credential source that is empty.
+    pub fn new_empty() -> Self {
+        Self::new(Vec::new(), Vec::new())
+    }
+}
+
+impl<C0, C1> BothCredentialSource<C0, C1> for OwnedBothCredentialSource<C0, C1>
+where
+    C0: V0Credential,
+    C1: V1Credential,
+{
+    type V0Source = OwnedCredentialSource<C0>;
+    type V1Source = OwnedCredentialSource<C1>;
+
+    fn v0(&self) -> &Self::V0Source {
+        &self.v0_source
+    }
+    fn v1(&self) -> &Self::V1Source {
+        &self.v1_source
+    }
+}
diff --git a/nearby/presence/np_adv/src/credential/v0.rs b/nearby/presence/np_adv/src/credential/v0.rs
new file mode 100644
index 0000000..e2d1b5d
--- /dev/null
+++ b/nearby/presence/np_adv/src/credential/v0.rs
@@ -0,0 +1,80 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Cryptographic materials for v0 advertisement-format credentials.
+
+use super::*;
+
+/// Cryptographic material for an individual NP credential used to decrypt v0 advertisements.
+// Space-time tradeoffs:
+// - LDT keys (64b) take about 1.4us.
+pub trait V0CryptoMaterial {
+    /// Returns an LDT NP advertisement cipher built with the provided `Aes`
+    fn ldt_adv_cipher<C: CryptoProvider>(&self) -> ldt_np_adv::LdtNpAdvDecrypterXtsAes128<C>;
+}
+
+/// A [`V0CryptoMaterial`] that minimizes memory footprint at the expense of CPU time when
+/// providing derived key material
+pub struct MinimumFootprintV0CryptoMaterial {
+    key_seed: [u8; 32],
+    legacy_metadata_key_hmac: [u8; 32],
+}
+
+impl MinimumFootprintV0CryptoMaterial {
+    /// Construct an [MinimumFootprintV0CryptoMaterial] from the provided identity data.
+    pub fn new(key_seed: [u8; 32], legacy_metadata_key_hmac: [u8; 32]) -> Self {
+        Self { key_seed, legacy_metadata_key_hmac }
+    }
+}
+
+impl V0CryptoMaterial for MinimumFootprintV0CryptoMaterial {
+    fn ldt_adv_cipher<C: CryptoProvider>(&self) -> ldt_np_adv::LdtNpAdvDecrypterXtsAes128<C> {
+        let hkdf = np_hkdf::NpKeySeedHkdf::new(&self.key_seed);
+        ldt_np_adv::build_np_adv_decrypter(
+            &hkdf.legacy_ldt_key(),
+            self.legacy_metadata_key_hmac,
+            hkdf.legacy_metadata_key_hmac_key(),
+        )
+    }
+}
+
+/// [`V0CryptoMaterial`] that minimizes CPU time when providing key material at
+/// the expense of occupied memory.
+pub struct PrecalculatedV0CryptoMaterial {
+    pub(crate) legacy_ldt_key: ldt::LdtKey<xts_aes::XtsAes128Key>,
+    pub(crate) legacy_metadata_key_hmac: [u8; 32],
+    pub(crate) legacy_metadata_key_hmac_key: [u8; 32],
+}
+
+impl PrecalculatedV0CryptoMaterial {
+    /// Construct a new instance from the provided credential material.
+    pub fn new<C: CryptoProvider>(key_seed: &[u8; 32], legacy_metadata_key_hmac: [u8; 32]) -> Self {
+        let hkdf = np_hkdf::NpKeySeedHkdf::<C>::new(key_seed);
+        Self {
+            legacy_ldt_key: hkdf.legacy_ldt_key(),
+            legacy_metadata_key_hmac,
+            legacy_metadata_key_hmac_key: *hkdf.legacy_metadata_key_hmac_key().as_bytes(),
+        }
+    }
+}
+
+impl V0CryptoMaterial for PrecalculatedV0CryptoMaterial {
+    fn ldt_adv_cipher<C: CryptoProvider>(&self) -> ldt_np_adv::LdtNpAdvDecrypterXtsAes128<C> {
+        ldt_np_adv::build_np_adv_decrypter(
+            &self.legacy_ldt_key,
+            self.legacy_metadata_key_hmac,
+            self.legacy_metadata_key_hmac_key.into(),
+        )
+    }
+}
diff --git a/nearby/presence/np_adv/src/credential/v1.rs b/nearby/presence/np_adv/src/credential/v1.rs
new file mode 100644
index 0000000..4b134e4
--- /dev/null
+++ b/nearby/presence/np_adv/src/credential/v1.rs
@@ -0,0 +1,288 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Cryptographic materials for v1 advertisement-format credentials.
+
+use core::borrow::Borrow;
+use crypto_provider::{aes::Aes128Key, ed25519, CryptoProvider};
+use np_hkdf::UnsignedSectionKeys;
+
+/// Cryptographic materials necessary for determining whether or not
+/// a given V1 advertisement section matches an identity.
+/// Per the construction of the V1 specification, this is also
+/// the information necessary to decrypt the raw byte contents
+/// of an encrypted V1 section.
+#[derive(Clone)]
+pub struct SectionIdentityResolutionMaterial {
+    /// The AES key for decrypting section ciphertext
+    pub(crate) aes_key: Aes128Key,
+    /// The metadata key HMAC key for deriving and verifying the identity metadata
+    /// key HMAC against the expected value.
+    pub(crate) metadata_key_hmac_key: [u8; 32],
+    /// The expected metadata key HMAC to check against for an identity match.
+    pub(crate) expected_metadata_key_hmac: [u8; 32],
+}
+
+/// Cryptographic materials necessary for determining whether or not
+/// a given V1 signed advertisement section matches an identity.
+#[derive(Clone)]
+pub struct SignedSectionIdentityResolutionMaterial(SectionIdentityResolutionMaterial);
+
+impl SignedSectionIdentityResolutionMaterial {
+    #[cfg(test)]
+    pub(crate) fn from_raw(raw: SectionIdentityResolutionMaterial) -> Self {
+        Self(raw)
+    }
+    pub(crate) fn as_raw_resolution_material(&self) -> &SectionIdentityResolutionMaterial {
+        &self.0
+    }
+    pub(crate) fn from_hkdf_and_expected_metadata_key_hmac<C: CryptoProvider>(
+        hkdf: &np_hkdf::NpKeySeedHkdf<C>,
+        expected_metadata_key_hmac: [u8; 32],
+    ) -> Self {
+        Self(SectionIdentityResolutionMaterial {
+            aes_key: hkdf.extended_signed_section_aes_key(),
+            metadata_key_hmac_key: *hkdf.extended_signed_metadata_key_hmac_key().as_bytes(),
+            expected_metadata_key_hmac,
+        })
+    }
+}
+
+/// Cryptographic materials necessary for determining whether or not
+/// a given V1 MIC advertisement section matches an identity.
+#[derive(Clone)]
+pub struct UnsignedSectionIdentityResolutionMaterial(SectionIdentityResolutionMaterial);
+
+impl UnsignedSectionIdentityResolutionMaterial {
+    #[cfg(test)]
+    pub(crate) fn from_raw(raw: SectionIdentityResolutionMaterial) -> Self {
+        Self(raw)
+    }
+    pub(crate) fn as_raw_resolution_material(&self) -> &SectionIdentityResolutionMaterial {
+        &self.0
+    }
+    pub(crate) fn from_hkdf_and_expected_metadata_key_hmac<C: CryptoProvider>(
+        hkdf: &np_hkdf::NpKeySeedHkdf<C>,
+        expected_metadata_key_hmac: [u8; 32],
+    ) -> Self {
+        Self(SectionIdentityResolutionMaterial {
+            aes_key: UnsignedSectionKeys::aes_key(hkdf),
+            metadata_key_hmac_key: *hkdf.extended_unsigned_metadata_key_hmac_key().as_bytes(),
+            expected_metadata_key_hmac,
+        })
+    }
+}
+
+/// Crypto materials for V1 signed sections which are not employed in identity resolution,
+/// but may be necessary to verify a signed section.
+#[derive(Clone)]
+pub struct SignedSectionVerificationMaterial {
+    /// The np_ed25519 public key to be
+    /// used for signature verification of signed sections.
+    pub(crate) pub_key: ed25519::RawPublicKey,
+}
+
+impl SignedSectionVerificationMaterial {
+    /// Gets the np_ed25519 public key for the given identity,
+    /// used for signature verification of signed sections.
+    pub(crate) fn signature_verification_public_key<C: CryptoProvider>(
+        &self,
+    ) -> np_ed25519::PublicKey<C> {
+        np_ed25519::PublicKey::from_bytes(&self.pub_key).expect("Should only contain valid keys")
+    }
+}
+
+/// Crypto materials for V1 unsigned sections which are not employed in identity resolution,
+/// but may be necessary to fully decrypt an unsigned section.
+#[derive(Clone)]
+pub struct UnsignedSectionVerificationMaterial {
+    /// The MIC HMAC key for verifying the integrity of unsigned sections.
+    pub(crate) mic_hmac_key: [u8; 32],
+}
+
+impl UnsignedSectionVerificationMaterial {
+    /// Returns the MIC HMAC key for unsigned sections
+    pub(crate) fn mic_hmac_key<C: CryptoProvider>(&self) -> np_hkdf::NpHmacSha256Key<C> {
+        self.mic_hmac_key.into()
+    }
+}
+
+// Space-time tradeoffs:
+// - Calculating an HKDF from the key seed costs about 2us on a gLinux laptop, and occupies 80b.
+// - Calculating an AES (16b) or HMAC (32b) key from the HKDF costs about 700ns.
+// The right tradeoff may also vary by use case. For frequently used identities we should
+// probably pre-calculate everything. For occasionally used ones, or ones that are loaded from
+// disk, used once, and discarded, we might want to precalculate on a separate thread or the
+// like.
+// The AES key and metadata key HMAC key are the most frequently used ones, as the MIC HMAC key
+// is only used on the matching identity, not all identities.
+
+/// Cryptographic material for an individual NP credential used to decrypt and verify v1 sections.
+pub trait V1CryptoMaterial {
+    /// The return type of `Self::signed_identity_resolution_material`, which is some
+    /// data-type which allows borrowing `SignedSectionIdentityResolutionMaterial`
+    type SignedIdentityResolverReference<'a>: Borrow<SignedSectionIdentityResolutionMaterial>
+    where
+        Self: 'a;
+    /// The return type of `Self::unsigned_identity_resolution_material`, which is some
+    /// data-type which allows borrowing `UnsignedSectionIdentityResolutionMaterial`
+    type UnsignedIdentityResolverReference<'a>: Borrow<UnsignedSectionIdentityResolutionMaterial>
+    where
+        Self: 'a;
+
+    /// Constructs or references the identity resolution material for signed sections
+    fn signed_identity_resolution_material<C: CryptoProvider>(
+        &self,
+    ) -> Self::SignedIdentityResolverReference<'_>;
+
+    /// Constructs or references the identity resolution material for unsigned sections
+    fn unsigned_identity_resolution_material<C: CryptoProvider>(
+        &self,
+    ) -> Self::UnsignedIdentityResolverReference<'_>;
+
+    /// Constructs or copies non-identity-resolution deserialization material for signed
+    /// sections.
+    ///
+    /// Note: We mandate "copies" here due to the relatively small size of verification-only crypto
+    /// materials (32 bytes).
+    fn signed_verification_material<C: CryptoProvider>(&self) -> SignedSectionVerificationMaterial;
+
+    /// Constructs or copies non-identity-resolution deserialization material for unsigned
+    /// sections.
+    ///
+    /// Note: We mandate "copies" here due to the relatively small size of verification-only crypto
+    /// materials (32 bytes).
+    fn unsigned_verification_material<C: CryptoProvider>(
+        &self,
+    ) -> UnsignedSectionVerificationMaterial;
+
+    /// Constructs pre-calculated crypto material out of this crypto-material.
+    fn to_precalculated<C: CryptoProvider>(self) -> PrecalculatedV1CryptoMaterial
+    where
+        Self: Sized,
+    {
+        let signed_identity_resolution_material =
+            self.signed_identity_resolution_material::<C>().borrow().clone();
+        let unsigned_identity_resolution_material =
+            self.unsigned_identity_resolution_material::<C>().borrow().clone();
+        let signed_verification_material = self.signed_verification_material::<C>();
+        let unsigned_verification_material = self.unsigned_verification_material::<C>();
+        PrecalculatedV1CryptoMaterial {
+            signed_identity_resolution_material,
+            unsigned_identity_resolution_material,
+            signed_verification_material,
+            unsigned_verification_material,
+        }
+    }
+}
+
+/// [`V1CryptoMaterial`] that minimizes CPU time when providing key material at
+/// the expense of occupied memory
+pub struct PrecalculatedV1CryptoMaterial {
+    pub(crate) signed_identity_resolution_material: SignedSectionIdentityResolutionMaterial,
+    pub(crate) unsigned_identity_resolution_material: UnsignedSectionIdentityResolutionMaterial,
+    pub(crate) signed_verification_material: SignedSectionVerificationMaterial,
+    pub(crate) unsigned_verification_material: UnsignedSectionVerificationMaterial,
+}
+
+impl V1CryptoMaterial for PrecalculatedV1CryptoMaterial {
+    type SignedIdentityResolverReference<'a> = &'a SignedSectionIdentityResolutionMaterial
+        where Self: 'a;
+    type UnsignedIdentityResolverReference<'a> = &'a UnsignedSectionIdentityResolutionMaterial
+        where Self: 'a;
+
+    fn signed_identity_resolution_material<C: CryptoProvider>(
+        &self,
+    ) -> Self::SignedIdentityResolverReference<'_> {
+        &self.signed_identity_resolution_material
+    }
+    fn unsigned_identity_resolution_material<C: CryptoProvider>(
+        &self,
+    ) -> Self::UnsignedIdentityResolverReference<'_> {
+        &self.unsigned_identity_resolution_material
+    }
+    fn signed_verification_material<C: CryptoProvider>(&self) -> SignedSectionVerificationMaterial {
+        self.signed_verification_material.clone()
+    }
+    fn unsigned_verification_material<C: CryptoProvider>(
+        &self,
+    ) -> UnsignedSectionVerificationMaterial {
+        self.unsigned_verification_material.clone()
+    }
+}
+
+/// [`V1CryptoMaterial`] that minimizes memory footprint at the expense of CPU
+/// time when providing derived key material.
+pub struct MinimumFootprintV1CryptoMaterial {
+    key_seed: [u8; 32],
+    expected_unsigned_metadata_key_hmac: [u8; 32],
+    expected_signed_metadata_key_hmac: [u8; 32],
+    pub_key: ed25519::RawPublicKey,
+}
+
+impl MinimumFootprintV1CryptoMaterial {
+    /// Construct an [MinimumFootprintV1CryptoMaterial] from the provided identity data.
+    pub fn new<C: CryptoProvider>(
+        key_seed: [u8; 32],
+        expected_unsigned_metadata_key_hmac: [u8; 32],
+        expected_signed_metadata_key_hmac: [u8; 32],
+        pub_key: np_ed25519::PublicKey<C>,
+    ) -> Self {
+        Self {
+            key_seed,
+            expected_unsigned_metadata_key_hmac,
+            expected_signed_metadata_key_hmac,
+            pub_key: pub_key.to_bytes(),
+        }
+    }
+}
+
+impl V1CryptoMaterial for MinimumFootprintV1CryptoMaterial {
+    type SignedIdentityResolverReference<'a> = SignedSectionIdentityResolutionMaterial
+        where Self: 'a;
+    type UnsignedIdentityResolverReference<'a> = UnsignedSectionIdentityResolutionMaterial
+        where Self: 'a;
+
+    fn signed_identity_resolution_material<C: CryptoProvider>(
+        &self,
+    ) -> Self::SignedIdentityResolverReference<'_> {
+        let hkdf = np_hkdf::NpKeySeedHkdf::<C>::new(&self.key_seed);
+        SignedSectionIdentityResolutionMaterial::from_hkdf_and_expected_metadata_key_hmac(
+            &hkdf,
+            self.expected_signed_metadata_key_hmac,
+        )
+    }
+
+    fn unsigned_identity_resolution_material<C: CryptoProvider>(
+        &self,
+    ) -> Self::UnsignedIdentityResolverReference<'_> {
+        let hkdf = np_hkdf::NpKeySeedHkdf::<C>::new(&self.key_seed);
+        UnsignedSectionIdentityResolutionMaterial::from_hkdf_and_expected_metadata_key_hmac(
+            &hkdf,
+            self.expected_unsigned_metadata_key_hmac,
+        )
+    }
+
+    fn signed_verification_material<C: CryptoProvider>(&self) -> SignedSectionVerificationMaterial {
+        SignedSectionVerificationMaterial { pub_key: self.pub_key }
+    }
+
+    fn unsigned_verification_material<C: CryptoProvider>(
+        &self,
+    ) -> UnsignedSectionVerificationMaterial {
+        let hkdf = np_hkdf::NpKeySeedHkdf::<C>::new(&self.key_seed);
+        let mic_hmac_key = *UnsignedSectionKeys::hmac_key(&hkdf).as_bytes();
+        UnsignedSectionVerificationMaterial { mic_hmac_key }
+    }
+}
diff --git a/nearby/presence/np_adv/src/de_type.rs b/nearby/presence/np_adv/src/de_type.rs
new file mode 100644
index 0000000..90c86e1
--- /dev/null
+++ b/nearby/presence/np_adv/src/de_type.rs
@@ -0,0 +1,88 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! DE types that are shared across v0 and v1.
+
+// The same ids are used for v0/legacy and v1/extended
+const IDENTITY_DE_TYPES_BY_CODE: [Option<IdentityDataElementType>; 5] = [
+    // no need for more elements since identity types are at indices 1-4
+    None,                                       // 0b0000
+    Some(IdentityDataElementType::Private),     // 0b0001
+    Some(IdentityDataElementType::Trusted),     // 0b0010
+    Some(IdentityDataElementType::Public),      // 0b0011
+    Some(IdentityDataElementType::Provisioned), // 0b0100
+];
+
+/// DE types for special DEs that contain other DEs and consume the entire payload of the
+/// advertisement.
+///
+/// Shared between V0 and V1.
+///
+/// Must not overlap with [PlainDataElementType].
+#[derive(strum_macros::EnumIter, Debug, Clone, Copy, PartialEq, Eq)]
+#[allow(clippy::enum_variant_names)]
+pub(crate) enum IdentityDataElementType {
+    Private,
+    Trusted,
+    Public,
+    Provisioned,
+}
+
+impl IdentityDataElementType {
+    pub(crate) fn as_encrypted_identity_de_type(&self) -> Option<EncryptedIdentityDataElementType> {
+        match self {
+            IdentityDataElementType::Private => Some(EncryptedIdentityDataElementType::Private),
+            IdentityDataElementType::Trusted => Some(EncryptedIdentityDataElementType::Trusted),
+            IdentityDataElementType::Public => None,
+            IdentityDataElementType::Provisioned => {
+                Some(EncryptedIdentityDataElementType::Provisioned)
+            }
+        }
+    }
+
+    /// Type codes for identity DEs are shared between versions 0 and 1.
+    pub(crate) fn shared_type_code(&self) -> u8 {
+        match self {
+            IdentityDataElementType::Private => 0b0001,
+            IdentityDataElementType::Trusted => 0b0010,
+            IdentityDataElementType::Public => 0b0011,
+            IdentityDataElementType::Provisioned => 0b0100,
+        }
+    }
+
+    pub(crate) fn from_shared_type_code(code: u8) -> Option<Self> {
+        IDENTITY_DE_TYPES_BY_CODE.get(code as usize).and_then(|o| *o)
+    }
+}
+
+/// The identity DE types that support encryption.
+#[derive(strum_macros::EnumIter, Debug, Clone, Copy, PartialEq, Eq)]
+pub enum EncryptedIdentityDataElementType {
+    /// An identity that's shared with other devices where a user has signed in to their identity provider
+    Private,
+    /// An identity shared via some trust designation (e.g. starred contacts)
+    Trusted,
+    /// An identity established via a p2p link between two specific devices
+    Provisioned,
+}
+
+impl EncryptedIdentityDataElementType {
+    pub(crate) fn as_identity_data_element_type(&self) -> IdentityDataElementType {
+        match self {
+            EncryptedIdentityDataElementType::Private => IdentityDataElementType::Private,
+            EncryptedIdentityDataElementType::Trusted => IdentityDataElementType::Trusted,
+            EncryptedIdentityDataElementType::Provisioned => IdentityDataElementType::Provisioned,
+        }
+    }
+}
diff --git a/nearby/presence/np_adv/src/deser_v0_tests.rs b/nearby/presence/np_adv/src/deser_v0_tests.rs
new file mode 100644
index 0000000..fa94b89
--- /dev/null
+++ b/nearby/presence/np_adv/src/deser_v0_tests.rs
@@ -0,0 +1,281 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use rand::{seq::SliceRandom as _, SeedableRng as _};
+
+extern crate std;
+
+use crate::{
+    credential::{
+        simple::{SimpleMatchedCredential, SimpleV0Credential},
+        source::SliceCredentialSource,
+        v0::MinimumFootprintV0CryptoMaterial,
+    },
+    de_type::EncryptedIdentityDataElementType,
+    deserialize_v0_advertisement,
+    legacy::{
+        actions::{ActionBits, ActionsDataElement, ToActionElement},
+        data_elements::DataElement,
+        deserialize::PlainDataElement,
+        serialize::{AdvBuilder, Identity, LdtIdentity},
+        BLE_ADV_SVC_CONTENT_LEN,
+    },
+    shared_data::ContextSyncSeqNum,
+    CredentialSource, NoIdentity, PlaintextIdentityMode, PublicIdentity, V0AdvContents,
+    V0Credential,
+};
+use array_view::ArrayView;
+use core::marker::PhantomData;
+use crypto_provider::CryptoProvider;
+use crypto_provider_default::CryptoProviderImpl;
+use ldt_np_adv::{LdtEncrypterXtsAes128, LegacySalt};
+use std::{prelude::rust_2021::*, vec};
+use strum::IntoEnumIterator as _;
+
+#[test]
+fn v0_all_identities_resolvable() {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+    for _ in 0..100 {
+        let identities = (0..100).map(|_| TestIdentity::random(&mut rng)).collect::<Vec<_>>();
+
+        let (adv, adv_config) = adv_random_identity(&mut rng, &identities);
+
+        let creds = identities.iter().map(|i| i.credential()).collect::<Vec<_>>();
+        let cred_source = SliceCredentialSource::new(&creds);
+
+        let contents = deser_v0::<_, _, CryptoProviderImpl>(&cred_source, adv.as_slice());
+
+        assert_adv_equals(&adv_config, &contents);
+    }
+}
+
+#[test]
+fn v0_only_non_matching_identities_available() {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+    for _ in 0..100 {
+        let identities = (0..100).map(|_| TestIdentity::random(&mut rng)).collect::<Vec<_>>();
+
+        let (adv, adv_config) = adv_random_identity(&mut rng, &identities);
+
+        let creds = identities
+            .iter()
+            .filter(|i| {
+                // remove identity used, if any
+                !adv_config.identity.map(|sci| sci.key_seed == i.key_seed).unwrap_or(false)
+            })
+            .map(|i| i.credential())
+            .collect::<Vec<_>>();
+        let cred_source = SliceCredentialSource::new(&creds);
+
+        let contents = deser_v0::<_, _, CryptoProviderImpl>(&cred_source, adv.as_slice());
+
+        match adv_config.identity {
+            // we ended up generating plaintext, so it's fine
+            None => assert_adv_equals(&adv_config, &contents),
+            Some(_) => {
+                // we generated an encrypted adv, but didn't include the credential
+                assert_eq!(V0AdvContents::NoMatchingCredentials, contents);
+            }
+        }
+    }
+}
+
+#[test]
+fn v0_no_creds_available_error_if_encrypted() {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+    for _ in 0..100 {
+        let identities = (0..100).map(|_| TestIdentity::random(&mut rng)).collect::<Vec<_>>();
+
+        let (adv, adv_config) = adv_random_identity(&mut rng, &identities);
+
+        let creds = Vec::<SimpleV0Credential<MinimumFootprintV0CryptoMaterial, [u8; 32]>>::new();
+        let cred_source = SliceCredentialSource::new(&creds);
+
+        let contents = deser_v0::<_, _, CryptoProviderImpl>(&cred_source, adv.as_slice());
+
+        match adv_config.identity {
+            // we ended up generating plaintext, so it's fine
+            None => assert_adv_equals(&adv_config, &contents),
+            Some(_) => {
+                // we generated an encrypted adv, but didn't include the credential
+                assert_eq!(V0AdvContents::NoMatchingCredentials, contents);
+            }
+        }
+    }
+}
+
+fn assert_adv_equals<'m>(
+    adv_config: &AdvConfig,
+    adv: &V0AdvContents<'m, SimpleMatchedCredential<'m, [u8; 32]>>,
+) {
+    match adv_config.identity {
+        None => match adv {
+            V0AdvContents::Plaintext(p) => {
+                let mut action_bits = ActionBits::default();
+                action_bits.set_action(ContextSyncSeqNum::try_from(3).unwrap());
+                let de = ActionsDataElement::from(action_bits);
+
+                assert_eq!(adv_config.plaintext_mode.unwrap(), p.identity());
+                assert_eq!(
+                    vec![&PlainDataElement::Actions(de)],
+                    p.data_elements().collect::<Vec<_>>()
+                )
+            }
+            _ => panic!("should be a plaintext adv"),
+        },
+        Some(_) => match adv {
+            V0AdvContents::Decrypted(wmc) => {
+                assert!(adv_config.plaintext_mode.is_none());
+
+                // different generic type param, so can't re-use the DE from above
+                let mut action_bits = ActionBits::default();
+                action_bits.set_action(ContextSyncSeqNum::try_from(3).unwrap());
+                let de = ActionsDataElement::from(action_bits);
+
+                assert_eq!(
+                    vec![&PlainDataElement::Actions(de)],
+                    wmc.contents().data_elements().collect::<Vec<_>>()
+                );
+                assert_eq!(
+                    adv_config.identity.unwrap().identity_type,
+                    wmc.contents().identity_type()
+                );
+                assert_eq!(
+                    &adv_config.identity.unwrap().legacy_metadata_key,
+                    wmc.contents().metadata_key()
+                );
+            }
+            _ => panic!("should be an encrypted adv"),
+        },
+    }
+}
+
+fn deser_v0<'s, C, S, P>(
+    cred_source: &'s S,
+    adv: &[u8],
+) -> V0AdvContents<'s, SimpleMatchedCredential<'s, [u8; 32]>>
+where
+    C: V0Credential<Matched<'s> = SimpleMatchedCredential<'s, [u8; 32]>> + 's,
+    S: CredentialSource<C>,
+    P: CryptoProvider,
+{
+    deserialize_v0_advertisement::<C, S, P>(adv, cred_source).unwrap()
+}
+
+/// Populate an advertisement with a randomly chosen identity and a DE
+fn adv_random_identity<'a, R: rand::Rng>(
+    mut rng: &mut R,
+    identities: &'a Vec<TestIdentity<CryptoProviderImpl>>,
+) -> (ArrayView<u8, { BLE_ADV_SVC_CONTENT_LEN }>, AdvConfig<'a>) {
+    let identity = identities.choose(&mut rng).unwrap();
+    match rng.gen_range(0_u8..=2) {
+        0 => {
+            let mut adv_builder = AdvBuilder::new(NoIdentity::default());
+            add_de(&mut adv_builder);
+
+            (
+                adv_builder.into_advertisement().unwrap(),
+                AdvConfig::new(None, Some(PlaintextIdentityMode::None)),
+            )
+        }
+        1 => {
+            let mut adv_builder = AdvBuilder::new(PublicIdentity::default());
+            add_de(&mut adv_builder);
+
+            (
+                adv_builder.into_advertisement().unwrap(),
+                AdvConfig::new(None, Some(PlaintextIdentityMode::Public)),
+            )
+        }
+        2 => {
+            let mut adv_builder = AdvBuilder::new(LdtIdentity::<CryptoProviderImpl>::new(
+                identity.identity_type,
+                LegacySalt::from(rng.gen::<[u8; 2]>()),
+                identity.legacy_metadata_key,
+                LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(&identity.hkdf().legacy_ldt_key()),
+            ));
+            add_de(&mut adv_builder);
+
+            (adv_builder.into_advertisement().unwrap(), AdvConfig::new(Some(identity), None))
+        }
+
+        _ => unreachable!(),
+    }
+}
+
+fn add_de<I>(adv_builder: &mut AdvBuilder<I>)
+where
+    I: Identity,
+    ActionsDataElement<I::Flavor>: DataElement,
+    ContextSyncSeqNum: ToActionElement<I::Flavor>,
+{
+    let mut action_bits = ActionBits::default();
+    action_bits.set_action(ContextSyncSeqNum::try_from(3).unwrap());
+    let de = ActionsDataElement::from(action_bits);
+    adv_builder.add_data_element(de).unwrap();
+}
+
+struct TestIdentity<C: CryptoProvider> {
+    identity_type: EncryptedIdentityDataElementType,
+    key_seed: [u8; 32],
+    legacy_metadata_key: [u8; 14],
+    _marker: PhantomData<C>,
+}
+
+impl<C: CryptoProvider> TestIdentity<C> {
+    /// Generate a new identity with random crypto material
+    fn random<R: rand::Rng + rand::CryptoRng>(rng: &mut R) -> Self {
+        Self {
+            identity_type: *EncryptedIdentityDataElementType::iter()
+                .collect::<Vec<_>>()
+                .choose(rng)
+                .unwrap(),
+            key_seed: rng.gen(),
+            legacy_metadata_key: rng.gen(),
+            _marker: PhantomData,
+        }
+    }
+
+    /// Returns a credential using crypto material from this identity
+    fn credential(&self) -> SimpleV0Credential<MinimumFootprintV0CryptoMaterial, [u8; 32]> {
+        let hkdf = self.hkdf();
+        SimpleV0Credential::new(
+            MinimumFootprintV0CryptoMaterial::new(
+                self.key_seed,
+                hkdf.legacy_metadata_key_hmac_key().calculate_hmac(&self.legacy_metadata_key),
+            ),
+            self.key_seed,
+        )
+    }
+
+    fn hkdf(&self) -> np_hkdf::NpKeySeedHkdf<C> {
+        np_hkdf::NpKeySeedHkdf::new(&self.key_seed)
+    }
+}
+
+struct AdvConfig<'a> {
+    /// `Some` iff an encrypted identity should be used
+    identity: Option<&'a TestIdentity<CryptoProviderImpl>>,
+    /// `Some` iff `identity` is `None`
+    plaintext_mode: Option<PlaintextIdentityMode>,
+}
+
+impl<'a> AdvConfig<'a> {
+    fn new(
+        identity: Option<&'a TestIdentity<CryptoProviderImpl>>,
+        plaintext_mode: Option<PlaintextIdentityMode>,
+    ) -> Self {
+        Self { identity, plaintext_mode }
+    }
+}
diff --git a/nearby/presence/np_adv/src/deser_v1_tests.rs b/nearby/presence/np_adv/src/deser_v1_tests.rs
new file mode 100644
index 0000000..b59b18b
--- /dev/null
+++ b/nearby/presence/np_adv/src/deser_v1_tests.rs
@@ -0,0 +1,486 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use core::marker::PhantomData;
+use rand::{rngs::StdRng, seq::SliceRandom as _, Rng as _, SeedableRng as _};
+
+extern crate std;
+
+use crate::{
+    credential::{
+        simple::{SimpleMatchedCredential, SimpleV1Credential},
+        source::SliceCredentialSource,
+        v1::MinimumFootprintV1CryptoMaterial,
+    },
+    de_type::EncryptedIdentityDataElementType,
+    deserialize_v1_advertisement,
+    extended::{
+        data_elements::GenericDataElement,
+        deserialize::VerificationMode,
+        serialize::{
+            AdvBuilder, EncodedAdvertisement, MicEncrypted, SectionBuilder, SectionIdentity,
+            SignedEncrypted,
+        },
+    },
+    AdvDeserializationError, AdvDeserializationErrorDetailsHazmat, CredentialSource,
+    PlaintextIdentityMode, PublicIdentity, Section, V1AdvContents, V1Credential,
+    V1DeserializedSection,
+};
+use crypto_provider::{CryptoProvider, CryptoRng};
+use std::{collections, prelude::rust_2021::*, vec};
+use strum::IntoEnumIterator as _;
+
+use crypto_provider_default::CryptoProviderImpl;
+
+#[test]
+fn v1_all_identities_resolvable_mix_plaintext_ciphertext() {
+    let mut rng = StdRng::from_entropy();
+    for _ in 0..100 {
+        let identities = (0..100)
+            .map(|_| TestIdentity::<CryptoProviderImpl>::random(&mut rng))
+            .collect::<Vec<_>>();
+
+        let mut adv_builder = AdvBuilder::new();
+        let section_configs = fill_adv(&mut rng, &identities, &mut adv_builder);
+        let adv = adv_builder.into_advertisement();
+        let creds = identities.iter().map(|i| i.credential()).collect::<Vec<_>>();
+        let cred_source = SliceCredentialSource::new(&creds);
+        // check if the section header would be 0 or if the section is empty
+        match section_configs.is_empty() {
+            true => {
+                let v1_error = deser_v1_error::<_, _, CryptoProviderImpl>(&cred_source, adv);
+                assert_eq!(
+                    v1_error,
+                    AdvDeserializationError::ParseError {
+                        details_hazmat:
+                            AdvDeserializationErrorDetailsHazmat::AdvertisementDeserializeError
+                    }
+                ); //assert a adv deserialization error
+            }
+            false => {
+                let v1_contents = deser_v1::<_, _, CryptoProviderImpl>(&cred_source, adv);
+                assert_eq!(0, v1_contents.invalid_sections_count());
+                assert_eq!(section_configs.len(), v1_contents.sections.len());
+                for (section_config, section) in
+                    section_configs.iter().zip(v1_contents.sections.iter())
+                {
+                    assert_section_equals(section_config, section);
+                }
+            }
+        }
+    }
+}
+
+#[test]
+fn v1_only_non_matching_identities_available_mix_plaintext_ciphertext() {
+    let mut rng = StdRng::from_entropy();
+    for _ in 0..100 {
+        let identities = (0..100)
+            .map(|_| TestIdentity::<CryptoProviderImpl>::random(&mut rng))
+            .collect::<Vec<_>>();
+
+        let mut adv_builder = AdvBuilder::new();
+        let section_configs = fill_adv(&mut rng, &identities, &mut adv_builder);
+        let adv = adv_builder.into_advertisement();
+        let creds = identities
+            .iter()
+            .filter(|i| {
+                // remove all identities used in sections
+                !section_configs
+                    .iter()
+                    .any(|sc| sc.identity.map(|sci| sci.key_seed == i.key_seed).unwrap_or(false))
+            })
+            .map(|i| i.credential())
+            .collect::<Vec<_>>();
+        let cred_source = SliceCredentialSource::new(&creds);
+        // check if the section header would be 0
+        match section_configs.is_empty() {
+            true => {
+                let v1_error = deser_v1_error::<_, _, CryptoProviderImpl>(&cred_source, adv);
+                assert_eq!(
+                    v1_error,
+                    AdvDeserializationError::ParseError {
+                        details_hazmat:
+                            AdvDeserializationErrorDetailsHazmat::AdvertisementDeserializeError
+                    }
+                ); //assert a adv deserialization error
+            }
+            false => {
+                let v1_contents = deser_v1::<_, _, CryptoProviderImpl>(&cred_source, adv);
+                // all encrypted identity sections are invalid
+                let encrypted_section_count =
+                    section_configs.iter().filter(|sc| sc.identity.is_some()).count();
+                assert_eq!(encrypted_section_count, v1_contents.invalid_sections_count());
+                assert_eq!(
+                    section_configs.len() - encrypted_section_count,
+                    v1_contents.sections.len()
+                );
+                for (section_config, section) in section_configs
+                    .iter()
+                    // skip encrypted sections
+                    .filter(|sc| sc.identity.is_none())
+                    .zip(v1_contents.sections.iter())
+                {
+                    assert_section_equals(section_config, section);
+                }
+            }
+        }
+    }
+}
+
+#[test]
+fn v1_no_creds_available_mix_plaintext_ciphertext() {
+    let mut rng = StdRng::from_entropy();
+    for _ in 0..100 {
+        let identities = (0..100).map(|_| TestIdentity::random(&mut rng)).collect::<Vec<_>>();
+
+        let mut adv_builder = AdvBuilder::new();
+        let section_configs =
+            fill_adv::<StdRng, CryptoProviderImpl>(&mut rng, &identities, &mut adv_builder);
+        let adv = adv_builder.into_advertisement();
+        let cred_source: SliceCredentialSource<
+            '_,
+            SimpleV1Credential<MinimumFootprintV1CryptoMaterial, [u8; 32]>,
+        > = SliceCredentialSource::new(&[]);
+        // check if the section header would be 0
+        match section_configs.is_empty() {
+            true => {
+                let v1_error = deser_v1_error::<_, _, CryptoProviderImpl>(&cred_source, adv);
+                assert_eq!(
+                    v1_error,
+                    AdvDeserializationError::ParseError {
+                        details_hazmat:
+                            AdvDeserializationErrorDetailsHazmat::AdvertisementDeserializeError
+                    }
+                ); //assert a adv deserialization error
+            }
+            false => {
+                let v1_contents = deser_v1::<_, _, CryptoProviderImpl>(&cred_source, adv);
+                // all encrypted identity sections are invalid
+                let encrypted_section_count =
+                    section_configs.iter().filter(|sc| sc.identity.is_some()).count();
+                assert_eq!(encrypted_section_count, v1_contents.invalid_sections_count());
+                assert_eq!(
+                    section_configs.len() - encrypted_section_count,
+                    v1_contents.sections.len()
+                );
+
+                for (section_config, section) in section_configs
+                    .iter()
+                    // skip encrypted sections
+                    .filter(|sc| sc.identity.is_none())
+                    .zip(v1_contents.sections.iter())
+                {
+                    assert_section_equals(section_config, section);
+                }
+            }
+        }
+    }
+}
+
+#[test]
+fn v1_only_some_matching_identities_available_mix_plaintext_ciphertext() {
+    let mut rng = StdRng::from_entropy();
+    for _ in 0..100 {
+        let identities = (0..100)
+            .map(|_| TestIdentity::<CryptoProviderImpl>::random(&mut rng))
+            .collect::<Vec<_>>();
+
+        let mut adv_builder = AdvBuilder::new();
+        let section_configs = fill_adv(&mut rng, &identities, &mut adv_builder);
+        let adv = adv_builder.into_advertisement();
+        // identities used in sections, which may be used in multiple sections too
+        let identities_to_remove: collections::HashSet<_> = identities
+            .iter()
+            .filter(|i| {
+                let identity_used = section_configs
+                    .iter()
+                    .any(|sc| sc.identity.map(|sci| sci.key_seed == i.key_seed).unwrap_or(false));
+
+                // only remove half the identities that were used
+                identity_used && rng.gen()
+            })
+            .map(|i| i.key_seed)
+            .collect();
+
+        let creds = identities
+            .iter()
+            .filter(|i| !identities_to_remove.contains(&i.key_seed))
+            .map(|i| i.credential())
+            .collect::<Vec<_>>();
+        let cred_source = SliceCredentialSource::new(&creds);
+        // check if the section header would be 0
+        match section_configs.is_empty() {
+            true => {
+                let v1_error = deser_v1_error::<_, _, CryptoProviderImpl>(&cred_source, adv);
+                assert_eq!(
+                    v1_error,
+                    AdvDeserializationError::ParseError {
+                        details_hazmat:
+                            AdvDeserializationErrorDetailsHazmat::AdvertisementDeserializeError
+                    }
+                ); //assert a adv deserialization error
+            }
+            false => {
+                let v1_contents = deser_v1::<_, _, CryptoProviderImpl>(&cred_source, adv);
+
+                let affected_sections: Vec<_> = section_configs
+                    .iter()
+                    .filter(|sc| {
+                        sc.identity
+                            .map(|sci| identities_to_remove.iter().any(|ks| &sci.key_seed == ks))
+                            .unwrap_or(false)
+                    })
+                    .collect();
+
+                assert_eq!(affected_sections.len(), v1_contents.invalid_sections_count());
+                assert_eq!(
+                    section_configs.len() - affected_sections.len(),
+                    v1_contents.sections.len()
+                );
+
+                for (section_config, section) in section_configs
+                    .iter()
+                    // skip sections w/ removed identities
+                    .filter(|sc| {
+                        sc.identity
+                            .map(|i| !identities_to_remove.contains(&i.key_seed))
+                            .unwrap_or(true)
+                    })
+                    .zip(v1_contents.sections.iter())
+                {
+                    assert_section_equals(section_config, section);
+                }
+            }
+        }
+    }
+}
+
+fn assert_section_equals<'m, C: CryptoProvider>(
+    section_config: &SectionConfig<C>,
+    section: &V1DeserializedSection<'m, SimpleMatchedCredential<'m, [u8; 32]>>,
+) {
+    match section_config.identity {
+        None => match section {
+            V1DeserializedSection::Plaintext(p) => {
+                assert!(section_config.verification_mode.is_none());
+
+                assert_eq!(section_config.plaintext_mode.unwrap(), p.identity());
+                assert_eq!(
+                    section_config.data_elements,
+                    p.data_elements().map(|de| de.into()).collect::<Vec<_>>()
+                )
+            }
+            V1DeserializedSection::Decrypted(_) => panic!("no id, but decrypted section"),
+        },
+        Some(_) => match section {
+            V1DeserializedSection::Plaintext(_) => panic!("id, but plaintext section"),
+            V1DeserializedSection::Decrypted(wmc) => {
+                assert!(section_config.plaintext_mode.is_none());
+
+                assert_eq!(
+                    section_config.data_elements,
+                    wmc.contents().data_elements().map(|de| de.into()).collect::<Vec<_>>()
+                );
+                assert_eq!(
+                    section_config.identity.unwrap().identity_type,
+                    wmc.contents().identity_type()
+                );
+                assert_eq!(
+                    &section_config.identity.unwrap().extended_metadata_key,
+                    wmc.contents().metadata_key()
+                );
+                assert_eq!(
+                    section_config.verification_mode.unwrap(),
+                    wmc.contents().verification_mode()
+                );
+            }
+        },
+    }
+}
+
+fn deser_v1_error<'s, C, S, P>(
+    cred_source: &'s S,
+    adv: EncodedAdvertisement,
+) -> AdvDeserializationError
+where
+    C: V1Credential<Matched<'s> = SimpleMatchedCredential<'s, [u8; 32]>> + 's,
+    S: CredentialSource<C>,
+    P: CryptoProvider,
+{
+    let v1_contents = match deserialize_v1_advertisement::<C, S, P>(adv.as_slice(), cred_source) {
+        Err(e) => e,
+        _ => panic!("Expecting an error!"),
+    };
+    v1_contents
+}
+
+fn deser_v1<'s, C, S, P>(
+    cred_source: &'s S,
+    adv: EncodedAdvertisement,
+) -> V1AdvContents<'s, SimpleMatchedCredential<'s, [u8; 32]>>
+where
+    C: V1Credential<Matched<'s> = SimpleMatchedCredential<'s, [u8; 32]>> + 's,
+    S: CredentialSource<C>,
+    P: CryptoProvider,
+{
+    deserialize_v1_advertisement::<C, S, P>(adv.as_slice(), cred_source).unwrap()
+}
+/// Populate a random number of sections with randomly chosen identities and random DEs
+fn fill_adv<'a, R: rand::Rng, C: CryptoProvider>(
+    mut rng: &mut R,
+    identities: &'a Vec<TestIdentity<C>>,
+    adv_builder: &mut AdvBuilder,
+) -> Vec<SectionConfig<'a, C>> {
+    let mut expected = Vec::new();
+    let mut salt_rng = C::CryptoRng::new();
+    // build sections
+    for _ in 0..rng.gen_range(0..=6) {
+        let chosen_index = rng.gen_range(0..identities.len());
+        let identity = &identities[chosen_index];
+        let res = match rng.gen_range(1_u8..=3) {
+            1 => adv_builder.section_builder(PublicIdentity::default()).map(|s| {
+                SectionConfig::new(
+                    None,
+                    Some(PlaintextIdentityMode::Public),
+                    None,
+                    add_des(s, &mut rng),
+                )
+            }),
+            2 => adv_builder
+                .section_builder(MicEncrypted::new_random_salt(
+                    &mut salt_rng,
+                    identity.identity_type,
+                    &identity.extended_metadata_key,
+                    &identity.hkdf(),
+                ))
+                .map(|s| {
+                    SectionConfig::new(
+                        Some(identity),
+                        None,
+                        Some(VerificationMode::Mic),
+                        add_des(s, &mut rng),
+                    )
+                }),
+            3 => adv_builder
+                .section_builder(SignedEncrypted::new_random_salt(
+                    &mut salt_rng,
+                    identity.identity_type,
+                    &identity.extended_metadata_key,
+                    &identity.key_pair,
+                    &identity.hkdf(),
+                ))
+                .map(|s| {
+                    SectionConfig::new(
+                        Some(identity),
+                        None,
+                        Some(VerificationMode::Signature),
+                        add_des(s, &mut rng),
+                    )
+                }),
+            _ => unreachable!(),
+        };
+        match res {
+            Ok(tuple) => expected.push(tuple),
+            Err(_) => {
+                // couldn't fit that section; maybe another smaller section will fit
+                continue;
+            }
+        }
+    }
+    expected
+}
+struct TestIdentity<C: CryptoProvider> {
+    identity_type: EncryptedIdentityDataElementType,
+    key_seed: [u8; 32],
+    extended_metadata_key: [u8; 16],
+    key_pair: np_ed25519::KeyPair<C>,
+    marker: PhantomData<C>,
+}
+impl<C: CryptoProvider> TestIdentity<C> {
+    /// Generate a new identity with random crypto material
+    fn random<R: rand::Rng + rand::CryptoRng>(rng: &mut R) -> Self {
+        Self {
+            identity_type: *EncryptedIdentityDataElementType::iter()
+                .collect::<Vec<_>>()
+                .choose(rng)
+                .unwrap(),
+            key_seed: rng.gen(),
+            extended_metadata_key: rng.gen(),
+            key_pair: np_ed25519::KeyPair::<C>::generate(),
+            marker: PhantomData,
+        }
+    }
+    /// Returns a credential using crypto material from this identity
+    fn credential(&self) -> SimpleV1Credential<MinimumFootprintV1CryptoMaterial, [u8; 32]> {
+        let hkdf = self.hkdf();
+        SimpleV1Credential::new(
+            MinimumFootprintV1CryptoMaterial::new(
+                self.key_seed,
+                hkdf.extended_unsigned_metadata_key_hmac_key()
+                    .calculate_hmac(&self.extended_metadata_key),
+                hkdf.extended_signed_metadata_key_hmac_key()
+                    .calculate_hmac(&self.extended_metadata_key),
+                self.key_pair.public(),
+            ),
+            self.key_seed,
+        )
+    }
+    fn hkdf(&self) -> np_hkdf::NpKeySeedHkdf<C> {
+        np_hkdf::NpKeySeedHkdf::<C>::new(&self.key_seed)
+    }
+}
+/// Add several DEs with random types and contents
+fn add_des<I: SectionIdentity, R: rand::Rng>(
+    mut sb: SectionBuilder<I>,
+    rng: &mut R,
+) -> Vec<GenericDataElement> {
+    let mut des = Vec::new();
+    for _ in 0..rng.gen_range(0..=2) {
+        // not worried about multi byte type encoding here, so just sticking with what can sometimes
+        // fit in the 1-byte header, and isn't an identity element
+        let de_type = rng.gen_range(10_u32..=20);
+        // covers lengths that fit or don't fit in 3 bits (1 byte header)
+        let de_len = rng.gen_range(0..=10);
+        let mut de_data = vec![0; de_len];
+        rng.fill(&mut de_data[..]);
+        let de = GenericDataElement::try_from(de_type.into(), &de_data).unwrap();
+        if sb.add_de(|_| de.clone()).is_err() {
+            // no more room in the section
+            break;
+        }
+        des.push(de);
+    }
+    sb.add_to_advertisement();
+    des
+}
+struct SectionConfig<'a, C: CryptoProvider> {
+    /// `Some` iff an encrypted identity should be used
+    identity: Option<&'a TestIdentity<C>>,
+    /// `Some` iff `identity` is `None`
+    plaintext_mode: Option<PlaintextIdentityMode>,
+    /// `Some` iff `identity` is `Some`
+    verification_mode: Option<VerificationMode>,
+    data_elements: Vec<GenericDataElement>,
+}
+impl<'a, C: CryptoProvider> SectionConfig<'a, C> {
+    pub fn new(
+        identity: Option<&'a TestIdentity<C>>,
+        plaintext_mode: Option<PlaintextIdentityMode>,
+        verification_mode: Option<VerificationMode>,
+        data_elements: Vec<GenericDataElement>,
+    ) -> Self {
+        Self { identity, plaintext_mode, verification_mode, data_elements }
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/data_elements/mod.rs b/nearby/presence/np_adv/src/extended/data_elements/mod.rs
new file mode 100644
index 0000000..2058be1
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/data_elements/mod.rs
@@ -0,0 +1,305 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! V1 data elements.
+//!
+//! Commonly used DEs have dedicated types (e.g. [TxPowerDataElement], etc), but if another DE is
+//! needed, [GenericDataElement] will allow constructing any type of DE.
+
+use crate::extended::{
+    de_type::DeType,
+    deserialize::DataElement,
+    serialize::{DeHeader, SingleTypeDataElement, WriteDataElement},
+    DeLength, ENCRYPTION_INFO_DE_TYPE, MAX_DE_LEN,
+};
+use crate::shared_data::*;
+use array_view::ArrayView;
+use sink::Sink;
+
+#[cfg(test)]
+mod tests;
+
+/// A general purpose data element for use cases that don't fit into an existing DE type.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct GenericDataElement {
+    de_type: DeType,
+    data: ArrayView<u8, MAX_DE_LEN>,
+}
+
+impl GenericDataElement {
+    /// Construct a `GenericDataElement` from the provided input.
+    ///
+    /// `de_type`: the DE type
+    /// `data`: the DE contents, length <= 127
+    pub fn try_from(de_type: DeType, data: &[u8]) -> Result<Self, GenericDataElementError> {
+        ArrayView::try_from_slice(data)
+            .ok_or(GenericDataElementError::DataTooLong)
+            .map(|data| Self { de_type, data })
+    }
+}
+
+/// Errors that can occur constructing a [GenericDataElement]
+#[derive(Debug, PartialEq, Eq)]
+pub enum GenericDataElementError {
+    /// The DE data is too long
+    DataTooLong,
+}
+
+impl WriteDataElement for GenericDataElement {
+    fn de_header(&self) -> DeHeader {
+        DeHeader::new(self.de_type, self.data.len().try_into().expect("length <= max DE len"))
+    }
+
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        sink.try_extend_from_slice(self.data.as_slice())
+    }
+}
+
+/// Convert a deserialized DE into one you can serialize
+impl<'a> From<DataElement<'a>> for GenericDataElement {
+    fn from(de: DataElement<'a>) -> Self {
+        Self::try_from(de.de_type(), de.contents())
+            .expect("Deserialized DE must have a valid length")
+    }
+}
+
+/// Advertising power
+#[derive(Clone)]
+pub struct TxPowerDataElement {
+    tx_power: TxPower,
+}
+
+impl From<TxPower> for TxPowerDataElement {
+    fn from(tx_power: TxPower) -> Self {
+        Self { tx_power }
+    }
+}
+
+impl SingleTypeDataElement for TxPowerDataElement {
+    const DE_TYPE: DeType = DeType::const_from(0x05);
+}
+
+impl WriteDataElement for TxPowerDataElement {
+    fn de_header(&self) -> DeHeader {
+        DeHeader::new(Self::DE_TYPE, 1_u8.try_into().expect("1 is a valid length"))
+    }
+
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        sink.try_push(self.tx_power.as_i8() as u8)
+    }
+}
+
+/// List of actions
+pub struct ActionsDataElement {
+    actions: tinyvec::ArrayVec<[u8; MAX_DE_LEN]>,
+}
+
+impl ActionsDataElement {
+    /// Returns `Some` if the actions will fit in a DE, `None` otherwise
+    pub fn try_from_actions(actions: &[u8]) -> Result<Self, ActionsDataElementError> {
+        let mut de = Self { actions: tinyvec::ArrayVec::new() };
+
+        de.actions
+            .try_extend_from_slice(actions)
+            .map(|_| de)
+            .ok_or(ActionsDataElementError::ActionsTooLong)
+    }
+}
+
+impl SingleTypeDataElement for ActionsDataElement {
+    const DE_TYPE: DeType = DeType::const_from(0x06);
+}
+
+impl WriteDataElement for ActionsDataElement {
+    fn de_header(&self) -> DeHeader {
+        DeHeader::new(Self::DE_TYPE, self.actions.len().try_into().expect("always <= max length"))
+    }
+
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        sink.try_extend_from_slice(&self.actions)
+    }
+}
+
+/// Errors that can occur constructing an [ActionsDataElement].
+#[derive(Debug, PartialEq, Eq)]
+pub enum ActionsDataElementError {
+    /// Too many action bytes.
+    ActionsTooLong,
+}
+
+pub(crate) const SIGNATURE_ENCRYPTION_SCHEME: u8 = 0b00001000;
+pub(crate) const MIC_ENCRYPTION_SCHEME: u8 = 0b00000000;
+
+/// Determines whether a signature or mic encryption scheme is used
+pub(crate) struct EncryptionInfoDataElement {
+    /// First byte is bESSSSRRR where SSSS is the encryption scheme, rest are the salt
+    pub info: [u8; 17],
+}
+
+impl SingleTypeDataElement for EncryptionInfoDataElement {
+    const DE_TYPE: DeType = ENCRYPTION_INFO_DE_TYPE;
+}
+
+impl EncryptionInfoDataElement {
+    pub(crate) fn serialize(&self) -> [u8; 19] {
+        let mut buffer = [0_u8; 19];
+        buffer[0..2].copy_from_slice(self.de_header().serialize().as_slice());
+        buffer[2..19].copy_from_slice(&self.info);
+        buffer
+    }
+
+    fn de_header(&self) -> DeHeader {
+        DeHeader::new(
+            Self::DE_TYPE,
+            DeLength {
+                len: self.info.len().try_into().expect("encryption info is a valid length"),
+            },
+        )
+    }
+
+    /// Constructs the signature encryption scheme variant
+    pub fn signature(salt_bytes: &[u8; 16]) -> Self {
+        Self::new(SIGNATURE_ENCRYPTION_SCHEME, salt_bytes)
+    }
+
+    /// Constructs the mic encryption scheme variant
+    pub fn mic(salt_bytes: &[u8; 16]) -> Self {
+        Self::new(MIC_ENCRYPTION_SCHEME, salt_bytes)
+    }
+
+    fn new(scheme: u8, salt_bytes: &[u8; 16]) -> Self {
+        let mut sig_info = [0_u8; 17];
+        sig_info[0] = scheme;
+        sig_info[1..].copy_from_slice(salt_bytes);
+        Self { info: sig_info }
+    }
+}
+
+/// Context sync sequence number
+pub struct ContextSyncSeqNumDataElement {
+    num: ContextSyncSeqNum,
+}
+
+impl From<ContextSyncSeqNum> for ContextSyncSeqNumDataElement {
+    fn from(num: ContextSyncSeqNum) -> Self {
+        Self { num }
+    }
+}
+
+impl SingleTypeDataElement for ContextSyncSeqNumDataElement {
+    const DE_TYPE: DeType = DeType::const_from(0x13);
+}
+
+impl WriteDataElement for ContextSyncSeqNumDataElement {
+    fn de_header(&self) -> DeHeader {
+        DeHeader::new(Self::DE_TYPE, 1_u8.try_into().expect("1 is a valid length"))
+    }
+
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        sink.try_push(self.num.as_u8())
+    }
+}
+
+/// Connectivity info
+pub struct ConnectivityInfoDataElement {
+    // TODO len
+    info: ArrayView<u8, 24>,
+}
+
+impl ConnectivityInfoDataElement {
+    /// Construct connectivity info for bluetooth.
+    pub fn bluetooth(svc_id: [u8; 4], mac: [u8; 6]) -> Self {
+        let mut array = [0; 24];
+        array[0] = 0x1; // bluetooth
+        array[1..5].copy_from_slice(&svc_id);
+        array[5..11].copy_from_slice(&mac);
+
+        Self { info: ArrayView::try_from_array(array, 11).expect("length is fixed") }
+    }
+
+    /// Construct connectivity info for mDNS.
+    // TODO port type, bssid
+    pub fn mdns(ip: [u8; 4], port: u8) -> Self {
+        let mut array = [0; 24];
+        array[0] = 0x2; // mdns
+        array[1..5].copy_from_slice(&ip);
+        array[5] = port;
+
+        Self { info: ArrayView::try_from_array(array, 6).expect("length is fixed") }
+    }
+
+    /// Construct connectivity info for WiFi Direct.
+    pub fn wifi_direct(ssid: [u8; 10], password: [u8; 10], freq: [u8; 2], port: u8) -> Self {
+        let mut array = [0; 24];
+        array[0] = 0x3; // wifi direct
+        array[1..11].copy_from_slice(&ssid);
+        array[11..21].copy_from_slice(&password);
+        array[21..23].copy_from_slice(&freq);
+        array[23] = port;
+
+        Self { info: ArrayView::try_from_array(array, 24).expect("length is fixed") }
+    }
+}
+
+impl SingleTypeDataElement for ConnectivityInfoDataElement {
+    const DE_TYPE: DeType = DeType::const_from(0x11);
+}
+
+impl WriteDataElement for ConnectivityInfoDataElement {
+    fn de_header(&self) -> DeHeader {
+        DeHeader::new(
+            Self::DE_TYPE,
+            self.info.len().try_into().expect("conn info is a valid length"),
+        )
+    }
+
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        sink.try_extend_from_slice(self.info.as_slice())
+    }
+}
+
+/// Connectivity capabilities
+pub struct ConnectivityCapabilityDataElement {
+    // TODO len
+    capability: ArrayView<u8, 7>,
+}
+
+impl ConnectivityCapabilityDataElement {
+    /// Construct connectivity capabilities for WiFi Direct.
+    pub fn wifi_direct(supported_freqs: [u8; 3], connected_freqs: [u8; 3]) -> Self {
+        let mut array = [0; 7];
+        array[0] = 0x2; // wifi direct
+        array[1..4].copy_from_slice(&supported_freqs);
+        array[4..7].copy_from_slice(&connected_freqs);
+
+        Self { capability: ArrayView::try_from_array(array, 7).expect("length is fixed") }
+    }
+}
+
+impl SingleTypeDataElement for ConnectivityCapabilityDataElement {
+    const DE_TYPE: DeType = DeType::const_from(0x12);
+}
+
+impl WriteDataElement for ConnectivityCapabilityDataElement {
+    fn de_header(&self) -> DeHeader {
+        DeHeader::new(
+            Self::DE_TYPE,
+            self.capability.len().try_into().expect("capability is a valid length"),
+        )
+    }
+
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        sink.try_extend_from_slice(self.capability.as_slice())
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/data_elements/tests.rs b/nearby/presence/np_adv/src/extended/data_elements/tests.rs
new file mode 100644
index 0000000..a8938b0
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/data_elements/tests.rs
@@ -0,0 +1,183 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use super::*;
+use crate::{
+    extended::serialize::{section_tests::SectionBuilderExt, AdvBuilder},
+    shared_data::TxPower,
+    PublicIdentity,
+};
+
+#[test]
+fn serialize_tx_power_de() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    section_builder.add_de_res(|_| TxPower::try_from(3_i8).map(TxPowerDataElement::from)).unwrap();
+
+    assert_eq!(
+        &[
+            3,    // section header
+            0x03, // public identity
+            0x15, // len 1 type 0x05
+            3
+        ],
+        section_builder.into_section().as_slice()
+    );
+}
+
+#[test]
+fn serialize_actions_de_empty() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    section_builder.add_de_res(|_| ActionsDataElement::try_from_actions(&[])).unwrap();
+
+    assert_eq!(
+        &[
+            2,    // section header
+            0x03, // public identity
+            0x06, // len 0 type 0x06
+        ],
+        section_builder.into_section().as_slice()
+    );
+}
+
+#[test]
+fn serialize_actions_de_non_empty() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    section_builder
+        .add_de_res(|_| ActionsDataElement::try_from_actions(&[1, 1, 2, 3, 5, 8]))
+        .unwrap();
+
+    assert_eq!(
+        &[
+            8,    // section header
+            0x03, // public identity
+            0x66, // len 6 type 0x06
+            1, 1, 2, 3, 5, 8 // fibonacci, of course
+        ],
+        section_builder.into_section().as_slice()
+    );
+}
+
+#[test]
+fn serialize_context_sync_seq_num_de() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    section_builder
+        .add_de_res(|_| ContextSyncSeqNum::try_from(3).map(ContextSyncSeqNumDataElement::from))
+        .unwrap();
+
+    assert_eq!(
+        &[
+            4,    // section header
+            0x03, // public identity
+            0x81, 0x13, // len 1 type 0x13
+            3,    // seq num
+        ],
+        section_builder.into_section().as_slice()
+    );
+}
+
+#[test]
+fn serialize_connectivity_info_de_bluetooth() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    section_builder.add_de(|_| ConnectivityInfoDataElement::bluetooth([1; 4], [2; 6])).unwrap();
+
+    assert_eq!(
+        &[
+            14,   // section header
+            0x03, // public identity
+            0x8B, 0x11, // len 11 type 0x11
+            1,    // connectivity type
+            1, 1, 1, 1, // svc id
+            2, 2, 2, 2, 2, 2 // mac
+        ],
+        section_builder.into_section().as_slice()
+    );
+}
+
+#[test]
+fn serialize_connectivity_info_de_mdns() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    section_builder.add_de(|_| ConnectivityInfoDataElement::mdns([1; 4], 2)).unwrap();
+
+    assert_eq!(
+        &[
+            9,    // section header
+            0x03, // public identity
+            0x86, 0x11, // len 11 type 0x11
+            2,    // connectivity type
+            1, 1, 1, 1, // svc id
+            2  // port
+        ],
+        section_builder.into_section().as_slice()
+    );
+}
+
+#[test]
+fn serialize_connectivity_info_de_wifi_direct() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    section_builder
+        .add_de(|_| ConnectivityInfoDataElement::wifi_direct([1; 10], [2; 10], [3; 2], 4))
+        .unwrap();
+
+    assert_eq!(
+        &[
+            27,   // section header
+            0x03, // public identity
+            0x98, 0x11, // len 24 type 0x11
+            3,    // connectivity type
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // ssid
+            2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // password
+            3, 3, // freq
+            4  // port
+        ],
+        section_builder.into_section().as_slice()
+    );
+}
+
+#[test]
+fn serialize_connectivity_capabilities_de_wifi_direct() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    section_builder
+        .add_de(|_| ConnectivityCapabilityDataElement::wifi_direct([1; 3], [2; 3]))
+        .unwrap();
+
+    assert_eq!(
+        &[
+            10,   // section header
+            0x03, // public identity
+            0x87, 0x12, // len 7 type 0x12
+            2,    // connectivity type
+            1, 1, 1, // supported
+            2, 2, 2, // connected
+        ],
+        section_builder.into_section().as_slice()
+    );
+}
diff --git a/nearby/presence/np_adv/src/extended/de_type.rs b/nearby/presence/np_adv/src/extended/de_type.rs
new file mode 100644
index 0000000..105d15e
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/de_type.rs
@@ -0,0 +1,143 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! V1 DE type types
+use crate::de_type::{EncryptedIdentityDataElementType, IdentityDataElementType};
+
+/// Data element types for extended advertisements
+#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
+pub struct DeType {
+    // 4 billion type codes should be enough for anybody
+    code: u32,
+}
+
+impl DeType {
+    /// A `const` equivalent to `From<u32>` since trait methods can't yet be const.
+    pub(crate) const fn const_from(value: u32) -> Self {
+        Self { code: value }
+    }
+
+    /// Returns the type as a u32
+    pub fn as_u32(&self) -> u32 {
+        self.code
+    }
+}
+
+impl From<u8> for DeType {
+    fn from(value: u8) -> Self {
+        DeType { code: value as u32 }
+    }
+}
+
+impl From<u32> for DeType {
+    fn from(value: u32) -> Self {
+        DeType { code: value }
+    }
+}
+
+pub(crate) trait ExtendedDataElementType: Sized {
+    /// A type code for use in the DE header.
+    fn type_code(&self) -> DeType;
+    /// Returns the matching type for the code, else `None`
+    fn from_type_code(de_type: DeType) -> Option<Self>;
+}
+
+impl ExtendedDataElementType for IdentityDataElementType {
+    fn type_code(&self) -> DeType {
+        DeType::from(self.shared_type_code())
+    }
+
+    fn from_type_code(de_type: DeType) -> Option<Self> {
+        de_type.code.try_into().ok().and_then(Self::from_shared_type_code)
+    }
+}
+
+impl ExtendedDataElementType for EncryptedIdentityDataElementType {
+    fn type_code(&self) -> DeType {
+        DeType::from(self.as_identity_data_element_type().shared_type_code())
+    }
+
+    fn from_type_code(code: DeType) -> Option<Self> {
+        IdentityDataElementType::from_type_code(code)
+            .and_then(|idet| idet.as_encrypted_identity_de_type())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    extern crate std;
+
+    use super::*;
+    use std::{collections, fmt};
+
+    #[test]
+    fn identity_type_codes_are_consistent() {
+        de_type_codes_are_consistent::<IdentityDataElementType>()
+    }
+
+    #[test]
+    fn encrypted_identity_type_codes_are_consistent() {
+        de_type_codes_are_consistent::<EncryptedIdentityDataElementType>()
+    }
+
+    #[test]
+    fn identity_type_codes_are_distinct() {
+        de_distinct_type_codes::<IdentityDataElementType>()
+    }
+
+    #[test]
+    fn encrypted_identity_type_codes_are_distinct() {
+        de_distinct_type_codes::<EncryptedIdentityDataElementType>()
+    }
+
+    #[test]
+    fn identity_no_accidentally_mapped_type_codes() {
+        de_no_accidentally_mapped_type_codes::<IdentityDataElementType>()
+    }
+
+    #[test]
+    fn encrypted_identity_no_accidentally_mapped_type_codes() {
+        de_no_accidentally_mapped_type_codes::<EncryptedIdentityDataElementType>()
+    }
+
+    fn de_type_codes_are_consistent<
+        D: PartialEq + fmt::Debug + ExtendedDataElementType + strum::IntoEnumIterator,
+    >() {
+        for det in D::iter() {
+            let actual = D::from_type_code(det.type_code());
+            assert_eq!(Some(det), actual)
+        }
+    }
+
+    fn de_distinct_type_codes<
+        D: PartialEq + fmt::Debug + ExtendedDataElementType + strum::IntoEnumIterator,
+    >() {
+        let codes = D::iter().map(|det| det.type_code()).collect::<collections::HashSet<_>>();
+        assert_eq!(codes.len(), D::iter().count());
+    }
+
+    fn de_no_accidentally_mapped_type_codes<
+        D: PartialEq + fmt::Debug + ExtendedDataElementType + strum::IntoEnumIterator,
+    >() {
+        let codes = D::iter().map(|det| det.type_code()).collect::<collections::HashSet<_>>();
+        // not going to try all 4 billion possibilities, but we can make an effort
+        for possible_code in 0_u32..100_000 {
+            if codes.contains(&possible_code.into()) {
+                continue;
+            }
+
+            assert_eq!(None, D::from_type_code(possible_code.into()));
+        }
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/mic_decrypt_tests.rs b/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/mic_decrypt_tests.rs
new file mode 100644
index 0000000..d112ead
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/mic_decrypt_tests.rs
@@ -0,0 +1,426 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use super::*;
+use crate::extended::data_elements::TxPowerDataElement;
+use crate::extended::serialize::{SingleTypeDataElement, WriteDataElement};
+use crate::shared_data::TxPower;
+use crate::{
+    credential::{simple::SimpleV1Credential, v1::MinimumFootprintV1CryptoMaterial},
+    de_type::EncryptedIdentityDataElementType,
+    extended::{
+        deserialize::{
+            encrypted_section::MicEncryptedSectionDeserializationError,
+            parse_sections,
+            test_stubs::{HkdfCryptoMaterial, IntermediateSectionExt},
+            CiphertextSection, OffsetDataElement, RawV1Salt,
+        },
+        serialize::{AdvBuilder, CapacityLimitedVec, MicEncrypted},
+    },
+    parse_adv_header, AdvHeader, Section,
+};
+use crypto_provider_default::CryptoProviderImpl;
+use np_hkdf::v1_salt::DataElementOffset;
+use sink::Sink;
+use std::{prelude::rust_2021::*, vec};
+
+#[test]
+fn deserialize_mic_encrypted_correct_keys() {
+    let metadata_key = [1; 16];
+    let key_seed = [2; 32];
+    let raw_salt = RawV1Salt([3; 16]);
+    let section_salt = V1Salt::<CryptoProviderImpl>::from(raw_salt);
+    let identity_type = EncryptedIdentityDataElementType::Private;
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder
+        .section_builder(MicEncrypted::new_for_testing(
+            identity_type,
+            V1Salt::from(*section_salt.as_array_ref()),
+            &metadata_key,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    let txpower_de = TxPowerDataElement::from(TxPower::try_from(5).unwrap());
+    section_builder.add_de(|_| txpower_de.clone()).unwrap();
+    section_builder.add_to_advertisement();
+
+    let adv = adv_builder.into_advertisement();
+
+    let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+
+    let adv_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+
+    let sections = parse_sections(&adv_header, remaining).unwrap();
+    assert_eq!(1, sections.len());
+
+    let section = sections.into_iter().next().unwrap();
+    let enc_section = section.as_ciphertext().unwrap();
+    let keypair = np_ed25519::KeyPair::<CryptoProviderImpl>::generate();
+
+    // deserializing to Section works
+    let credential = SimpleV1Credential::new(
+        MinimumFootprintV1CryptoMaterial::new::<CryptoProviderImpl>(
+            key_seed,
+            key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            keypair.public(),
+        ),
+        (),
+    );
+    let section = enc_section.try_deserialize::<_, CryptoProviderImpl>(&credential).unwrap();
+
+    assert_eq!(
+        DecryptedSection::new(
+            EncryptedIdentityDataElementType::Private,
+            VerificationMode::Mic,
+            metadata_key,
+            raw_salt,
+            SectionContents {
+                section_header: 19 // encryption info de
+                    + 2 // de header
+                    + 16 // metadata key
+                    + 2 // de contents
+                    + 16, // mic hmac tag
+                // battery DE
+                de_data: ArrayView::try_from_slice(&[5]).unwrap(),
+                data_elements: vec![OffsetDataElement {
+                    offset: 2.into(),
+                    de_type: 0x05_u8.into(),
+                    start_of_contents: 0,
+                    contents_len: 1
+                }]
+            }
+        ),
+        section
+    );
+
+    assert_eq!(
+        vec![(DataElementOffset::from(2_usize), TxPowerDataElement::DE_TYPE, vec![5_u8])],
+        section
+            .data_elements()
+            .map(|de| (de.offset(), de.de_type(), de.contents().to_vec()))
+            .collect::<Vec<_>>()
+    );
+
+    let contents = if let CiphertextSection::MicEncryptedIdentity(contents) = &enc_section {
+        contents
+    } else {
+        panic!("incorrect flavor");
+    };
+
+    let mut encryption_info_bytes = [0_u8; 19];
+    encryption_info_bytes[0..2].copy_from_slice(&[0x91, 0x10]);
+    encryption_info_bytes[2] = 0x00;
+    encryption_info_bytes[3..].copy_from_slice(section_salt.as_slice());
+
+    let ciphertext_end = adv.as_slice().len() - 16;
+    assert_eq!(
+        &MicEncryptedSection {
+            section_header: 19 // encryption info de
+                    + 2 // de header
+                    + 16 // metadata key
+                    + 2 // de contents
+                    + 16, // mic hmac tag
+            adv_header: &adv_header,
+            encryption_info: EncryptionInfo { bytes: encryption_info_bytes },
+            identity: EncryptedIdentityMetadata {
+                header_bytes: [0x90, 0x1],
+                offset: 1.into(),
+                identity_type: EncryptedIdentityDataElementType::Private,
+            },
+            all_ciphertext: &adv.as_slice()[1 + 1 + 19 + 2..ciphertext_end],
+            mic: SectionMic { mic: adv.as_slice()[ciphertext_end..].try_into().unwrap() }
+        },
+        contents
+    );
+
+    // plaintext is correct
+    {
+        let crypto_material = MinimumFootprintV1CryptoMaterial::new::<CryptoProviderImpl>(
+            key_seed,
+            key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            keypair.public(),
+        );
+        let identity_resolution_material =
+            crypto_material.unsigned_identity_resolution_material::<CryptoProviderImpl>();
+        let verification_material =
+            crypto_material.unsigned_verification_material::<CryptoProviderImpl>();
+
+        let decrypted = contents
+            .try_decrypt::<CryptoProviderImpl>(
+                &identity_resolution_material,
+                &verification_material,
+            )
+            .unwrap();
+
+        let mut expected = metadata_key.as_slice().to_vec();
+        // battery de
+        expected.extend_from_slice(txpower_de.clone().de_header().serialize().as_slice());
+        txpower_de.write_de_contents(&mut expected);
+
+        assert_eq!(&expected, decrypted.as_slice());
+    }
+}
+
+#[test]
+fn deserialize_mic_encrypted_incorrect_aes_key_error() {
+    // bad aes key -> bad metadata key plaintext
+    do_bad_deserialize_params::<CryptoProviderImpl>(
+        MicEncryptedSectionDeserializationError::MetadataKeyMacMismatch,
+        Some([0xFF; 16].into()),
+        None,
+        None,
+        None,
+    );
+}
+
+#[test]
+fn deserialize_mic_encrypted_incorrect_metadata_key_hmac_key_error() {
+    // bad metadata key hmac key -> bad calculated metadata key mac
+    do_bad_deserialize_params::<CryptoProviderImpl>(
+        MicEncryptedSectionDeserializationError::MetadataKeyMacMismatch,
+        None,
+        Some([0xFF; 32].into()),
+        None,
+        None,
+    );
+}
+
+#[test]
+fn deserialize_mic_encrypted_incorrect_mic_hmac_key_error() {
+    // bad mic hmac key -> bad calculated mic
+    do_bad_deserialize_params::<CryptoProviderImpl>(
+        MicEncryptedSectionDeserializationError::MicMismatch,
+        None,
+        None,
+        Some([0xFF; 32].into()),
+        None,
+    );
+}
+
+#[test]
+fn deserialize_mic_encrypted_incorrect_expected_metadata_key_hmac_error() {
+    // bad expected metadata key mac
+    do_bad_deserialize_params::<CryptoProviderImpl>(
+        MicEncryptedSectionDeserializationError::MetadataKeyMacMismatch,
+        None,
+        None,
+        None,
+        Some([0xFF; 32]),
+    );
+}
+
+#[test]
+fn deserialize_mic_encrypted_incorrect_salt_error() {
+    // bad salt -> bad iv -> bad metadata key plaintext
+    do_bad_deserialize_tampered(
+        MicEncryptedSectionDeserializationError::MetadataKeyMacMismatch,
+        |_| {},
+        |adv| adv[23..39].copy_from_slice(&[0xFF; 16]),
+    );
+}
+
+#[test]
+fn deserialize_mic_encrypted_de_that_wont_parse() {
+    // add an extra byte to the section, leading it to try to parse a DE that doesn't exist
+    do_bad_deserialize_tampered(
+        MicEncryptedSectionDeserializationError::DeParseError,
+        |sec| sec.try_push(0xFF).unwrap(),
+        |_| {},
+    );
+}
+
+#[test]
+fn deserialize_mic_encrypted_tampered_mic_error() {
+    // flip the a bit in the first MIC byte
+    do_bad_deserialize_tampered(
+        MicEncryptedSectionDeserializationError::MicMismatch,
+        |_| {},
+        |adv| {
+            let mic_start = adv.len() - 16;
+            adv[mic_start] ^= 0x01
+        },
+    );
+}
+
+#[test]
+fn deserialize_mic_encrypted_tampered_payload_error() {
+    // flip the last payload bit
+    do_bad_deserialize_tampered(
+        MicEncryptedSectionDeserializationError::MicMismatch,
+        |_| {},
+        |adv| *adv.last_mut().unwrap() ^= 0x01,
+    );
+}
+
+/// Attempt a decryption that will fail when using the provided parameters for decryption only.
+/// `None` means use the correct value for that parameter.
+fn do_bad_deserialize_params<C: CryptoProvider>(
+    error: MicEncryptedSectionDeserializationError,
+    aes_key: Option<crypto_provider::aes::Aes128Key>,
+    metadata_key_hmac_key: Option<np_hkdf::NpHmacSha256Key<C>>,
+    mic_hmac_key: Option<np_hkdf::NpHmacSha256Key<C>>,
+    expected_metadata_key_hmac: Option<[u8; 32]>,
+) {
+    let metadata_key = [1; 16];
+    let key_seed = [2; 32];
+    let section_salt: V1Salt<C> = [3; 16].into();
+    let identity_type = EncryptedIdentityDataElementType::Private;
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::new(&key_seed);
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder
+        .section_builder(MicEncrypted::new_for_testing(
+            identity_type,
+            section_salt,
+            &metadata_key,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    section_builder.add_de(|_| TxPowerDataElement::from(TxPower::try_from(7).unwrap())).unwrap();
+
+    section_builder.add_to_advertisement();
+
+    let adv = adv_builder.into_advertisement();
+
+    let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+
+    let v1_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+
+    let sections = parse_sections(&v1_header, remaining).unwrap();
+    assert_eq!(1, sections.len());
+
+    let section = sections.into_iter().next().unwrap();
+    let enc_section = section.as_ciphertext().unwrap();
+    let contents = if let CiphertextSection::MicEncryptedIdentity(contents) = &enc_section {
+        contents
+    } else {
+        panic!("incorrect flavor");
+    };
+
+    let unsigned_identity_resolution_material = SectionIdentityResolutionMaterial {
+        aes_key: aes_key.unwrap_or_else(|| np_hkdf::UnsignedSectionKeys::aes_key(&key_seed_hkdf)),
+        metadata_key_hmac_key: *metadata_key_hmac_key
+            .unwrap_or_else(|| key_seed_hkdf.extended_unsigned_metadata_key_hmac_key())
+            .as_bytes(),
+        expected_metadata_key_hmac: expected_metadata_key_hmac.unwrap_or_else(|| {
+            key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key)
+        }),
+    };
+    let identity_resolution_material =
+        UnsignedSectionIdentityResolutionMaterial::from_raw(unsigned_identity_resolution_material);
+
+    let verification_material = UnsignedSectionVerificationMaterial {
+        mic_hmac_key: *mic_hmac_key
+            .unwrap_or_else(|| np_hkdf::UnsignedSectionKeys::hmac_key(&key_seed_hkdf))
+            .as_bytes(),
+    };
+
+    assert_eq!(
+        error,
+        contents
+            .try_deserialize::<C>(&identity_resolution_material, &verification_material)
+            .unwrap_err()
+    );
+}
+
+fn do_bad_deserialize_tampered<
+    S: Fn(&mut CapacityLimitedVec<u8, NP_ADV_MAX_SECTION_LEN>),
+    A: Fn(&mut Vec<u8>),
+>(
+    expected_error: MicEncryptedSectionDeserializationError,
+    mangle_section: S,
+    mangle_adv: A,
+) {
+    let metadata_key = [1; 16];
+    let key_seed = [2; 32];
+    let section_salt: V1Salt<CryptoProviderImpl> = [3; 16].into();
+    let identity_type = EncryptedIdentityDataElementType::Private;
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::new(&key_seed);
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder
+        .section_builder(MicEncrypted::new_for_testing(
+            identity_type,
+            section_salt,
+            &metadata_key,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    section_builder.add_de(|_| TxPowerDataElement::from(TxPower::try_from(7).unwrap())).unwrap();
+
+    mangle_section(&mut section_builder.section);
+
+    section_builder.add_to_advertisement();
+
+    let adv = adv_builder.into_advertisement();
+    let mut adv_mut = adv.as_slice().to_vec();
+    mangle_adv(&mut adv_mut);
+
+    let (remaining, header) = parse_adv_header(&adv_mut).unwrap();
+
+    let v1_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+
+    let sections = parse_sections(&v1_header, remaining).unwrap();
+    assert_eq!(1, sections.len());
+
+    let section = sections.into_iter().next().unwrap();
+    let enc_section = section.as_ciphertext().unwrap();
+    let contents = if let CiphertextSection::MicEncryptedIdentity(contents) = &enc_section {
+        contents
+    } else {
+        panic!("incorrect flavor");
+    };
+
+    // generate a random key pair since we need _some_ public key
+    let key_pair = np_ed25519::KeyPair::<CryptoProviderImpl>::generate();
+
+    let crypto_material = HkdfCryptoMaterial::new(&key_seed, &metadata_key, key_pair.public());
+    let identity_resolution_material =
+        crypto_material.unsigned_identity_resolution_material::<CryptoProviderImpl>();
+    let verification_material =
+        crypto_material.unsigned_verification_material::<CryptoProviderImpl>();
+
+    assert_eq!(
+        expected_error,
+        contents
+            .try_deserialize::<CryptoProviderImpl>(
+                &identity_resolution_material,
+                &verification_material,
+            )
+            .unwrap_err()
+    );
+}
diff --git a/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/mod.rs b/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/mod.rs
new file mode 100644
index 0000000..ad305f5
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/mod.rs
@@ -0,0 +1,293 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use crate::{
+    credential::v1::*,
+    extended::{
+        deserialize::{
+            parse_non_identity_des, DecryptedSection, EncryptedIdentityMetadata, EncryptionInfo,
+            SectionContents, SectionMic, VerificationMode,
+        },
+        section_signature_payload::*,
+        to_array_view, METADATA_KEY_LEN, NP_ADV_MAX_SECTION_LEN,
+    },
+    V1Header, NP_SVC_UUID,
+};
+use array_view::ArrayView;
+use crypto_provider::{
+    aes::ctr::{AesCtr, AesCtrNonce, NonceAndCounter, AES_CTR_NONCE_LEN},
+    hmac::Hmac,
+    CryptoProvider,
+};
+use np_hkdf::v1_salt::V1Salt;
+
+#[cfg(test)]
+mod mic_decrypt_tests;
+#[cfg(test)]
+mod signature_decrypt_tests;
+
+#[derive(PartialEq, Eq, Debug)]
+pub(crate) struct SignatureEncryptedSection<'a> {
+    pub(crate) section_header: u8,
+    pub(crate) adv_header: &'a V1Header,
+    pub(crate) encryption_info: EncryptionInfo,
+    pub(crate) identity: EncryptedIdentityMetadata,
+    /// All ciphertext (Contents of identity DE + all DEs)
+    /// Length must be in `[METADATA_KEY_LEN, NP_ADV_MAX_SECTION_LEN]`.
+    pub(crate) all_ciphertext: &'a [u8],
+}
+
+impl<'a> SignatureEncryptedSection<'a> {
+    /// Decrypt the ciphertext and check that the first [METADATA_KEY_LEN] bytes match the expected HMAC.
+    /// The remaining data is not verified.
+    ///
+    /// Returns `Ok` if the section was an identity match.
+    /// Otherwise, returns `Err`.
+    pub(crate) fn try_decrypt<P: CryptoProvider>(
+        &self,
+        identity_resolution_material: &SignedSectionIdentityResolutionMaterial,
+    ) -> Result<ArrayView<u8, NP_ADV_MAX_SECTION_LEN>, SignatureEncryptedSectionDeserializationError>
+    {
+        let salt: V1Salt<P> = self.encryption_info.salt().into();
+        let (mut buf, mut cipher) = try_decrypt_metadata_key_prefix::<P>(
+            self.all_ciphertext,
+            salt.derive(Some(self.identity.offset)).expect("AES-CTR nonce is a valid HKDF size"),
+            identity_resolution_material.as_raw_resolution_material(),
+        )
+        .ok_or(SignatureEncryptedSectionDeserializationError::MetadataKeyMacMismatch)?;
+
+        // decrypt everything else
+        cipher.decrypt(&mut buf[METADATA_KEY_LEN..]);
+
+        Ok(to_array_view(buf))
+    }
+
+    /// Try deserializing into a [Section].
+    ///
+    /// Returns an error if the credential is incorrect or if the section data is malformed.
+    pub(crate) fn try_deserialize<P>(
+        &self,
+        identity_resolution_material: &SignedSectionIdentityResolutionMaterial,
+        verification_material: &SignedSectionVerificationMaterial,
+    ) -> Result<DecryptedSection, SignatureEncryptedSectionDeserializationError>
+    where
+        P: CryptoProvider,
+    {
+        let raw_salt = self.encryption_info.salt();
+        let salt: V1Salt<P> = raw_salt.into();
+        let plaintext = self.try_decrypt::<P>(identity_resolution_material)?;
+
+        // won't panic: plaintext length is at least METADATA_KEY_LEN
+        let (metadata_key, remaining) = plaintext.as_slice().split_at(METADATA_KEY_LEN);
+        let metadata_key =
+            metadata_key.try_into().expect("slice is the same length as the desired array");
+
+        if remaining.len() < crypto_provider::ed25519::SIGNATURE_LENGTH {
+            return Err(SignatureEncryptedSectionDeserializationError::SignatureMissing);
+        }
+
+        // should not panic due to above check
+        let (non_identity_des, sig) =
+            remaining.split_at(remaining.len() - crypto_provider::ed25519::SIGNATURE_LENGTH);
+
+        // de offset 2 because of leading encryption info and identity DEs
+        let (_, ref_des) = parse_non_identity_des(2)(non_identity_des)
+            .map_err(|_| SignatureEncryptedSectionDeserializationError::DeParseError)?;
+
+        // All implementations only check for 64 bytes, and this will always result in a 64 byte signature.
+        let expected_signature =
+            np_ed25519::Signature::<P>::try_from(sig).expect("Signature is always 64 bytes.");
+
+        let nonce = salt
+            .derive::<{ AES_CTR_NONCE_LEN }>(Some(self.identity.offset))
+            .expect("AES-CTR nonce is a valid HKDF length");
+
+        // all other plaintext, except for the signature.
+        // Won't panic because we know we just parsed the sig de from this,
+        // and we're using the as-parsed lengths
+        let remainder = &plaintext.as_slice()[..plaintext.len() - sig.len()];
+
+        let section_signature_payload = SectionSignaturePayload::from_deserialized_parts(
+            self.adv_header.header_byte,
+            self.section_header,
+            &self.encryption_info.bytes,
+            &nonce,
+            self.identity.header_bytes,
+            remainder,
+        );
+
+        let public_key = verification_material.signature_verification_public_key();
+
+        section_signature_payload.verify(&expected_signature, &public_key).map_err(|e| {
+            // Length of the payload should fit in the signature verification buffer.
+            debug_assert!(e != np_ed25519::SignatureVerificationError::PayloadTooBig);
+
+            SignatureEncryptedSectionDeserializationError::SignatureMismatch
+        })?;
+
+        Ok(DecryptedSection::new(
+            self.identity.identity_type,
+            VerificationMode::Signature,
+            metadata_key,
+            raw_salt,
+            SectionContents::new(self.section_header, &ref_des),
+        ))
+    }
+}
+
+/// Should not be exposed publicly as it's too detailed.
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) enum SignatureEncryptedSectionDeserializationError {
+    /// The decrypted metadata key did not have the right MAC
+    MetadataKeyMacMismatch,
+    /// The provided signature did not match the calculated signature
+    SignatureMismatch,
+    /// The provided signature is missing
+    SignatureMissing,
+    /// Decrypted DEs could not be parsed, possibly because the ciphertext was tampered with, as
+    /// DE parsing has to be done before the signature is verified
+    DeParseError,
+}
+
+#[derive(PartialEq, Eq, Debug)]
+pub(crate) struct MicEncryptedSection<'a> {
+    pub(crate) section_header: u8,
+    pub(crate) adv_header: &'a V1Header,
+    pub(crate) encryption_info: EncryptionInfo,
+    pub(crate) mic: SectionMic,
+    pub(crate) identity: EncryptedIdentityMetadata,
+    /// All ciphertext (Contents of identity DE + all DEs).
+    /// Length must be in `[METADATA_KEY_LEN, NP_ADV_MAX_SECTION_LEN]`.
+    pub(crate) all_ciphertext: &'a [u8],
+}
+
+impl<'a> MicEncryptedSection<'a> {
+    /// Attempt to decrypt and verify the encrypted portion of the section with the provided
+    /// precalculated cryptographic material for an MIC-encrypted section.
+    ///
+    /// If successful, returns a buffer containing the decrypted plaintext.
+    pub(crate) fn try_decrypt<P: CryptoProvider>(
+        &self,
+        identity_resolution_material: &UnsignedSectionIdentityResolutionMaterial,
+        verification_material: &UnsignedSectionVerificationMaterial,
+    ) -> Result<ArrayView<u8, NP_ADV_MAX_SECTION_LEN>, MicEncryptedSectionDeserializationError>
+    {
+        let salt: V1Salt<P> = self.encryption_info.salt().into();
+        let nonce =
+            salt.derive(Some(self.identity.offset)).expect("AES-CTR nonce is a valid HKDF size");
+
+        let (mut buf, mut cipher) = try_decrypt_metadata_key_prefix::<P>(
+            self.all_ciphertext,
+            nonce,
+            identity_resolution_material.as_raw_resolution_material(),
+        )
+        .ok_or(MicEncryptedSectionDeserializationError::MetadataKeyMacMismatch)?;
+
+        // if mic is ok, the section was generated by someone holding at least the shared credential
+        let mut mic_hmac = verification_material.mic_hmac_key::<P>().build_hmac();
+        mic_hmac.update(&NP_SVC_UUID);
+        mic_hmac.update(&[self.adv_header.header_byte]);
+        mic_hmac.update(&[self.section_header]);
+        mic_hmac.update(&self.encryption_info.bytes);
+        mic_hmac.update(&nonce);
+        mic_hmac.update(&self.identity.header_bytes);
+        mic_hmac.update(self.all_ciphertext);
+        mic_hmac
+            // adv only contains first 16 bytes of HMAC
+            .verify_truncated_left(&self.mic.mic)
+            .map_err(|_e| MicEncryptedSectionDeserializationError::MicMismatch)?;
+
+        // decrypt everything else
+        cipher.decrypt(&mut buf[METADATA_KEY_LEN..]);
+
+        Ok(to_array_view(buf))
+    }
+
+    /// Try deserializing into a [Section].
+    ///
+    /// Returns an error if the credential is incorrect or if the section data is malformed.
+    pub(crate) fn try_deserialize<P>(
+        &self,
+        identity_resolution_material: &UnsignedSectionIdentityResolutionMaterial,
+        verification_material: &UnsignedSectionVerificationMaterial,
+    ) -> Result<DecryptedSection, MicEncryptedSectionDeserializationError>
+    where
+        P: CryptoProvider,
+    {
+        let plaintext =
+            self.try_decrypt::<P>(identity_resolution_material, verification_material)?;
+        // won't panic: plaintext is at least METADATA_KEY_LEN long
+        let (metadata_key, remaining_des) = plaintext.as_slice().split_at(METADATA_KEY_LEN);
+        let metadata_key =
+            metadata_key.try_into().expect("slice is the same length as the desired array");
+        // offset 2 for encryption info and identity DEs
+        let (_, ref_des) = parse_non_identity_des(2)(remaining_des)
+            .map_err(|_| MicEncryptedSectionDeserializationError::DeParseError)?;
+
+        Ok(DecryptedSection::new(
+            self.identity.identity_type,
+            VerificationMode::Mic,
+            metadata_key,
+            self.encryption_info.salt(),
+            SectionContents::new(self.section_header, &ref_des),
+        ))
+    }
+}
+
+/// Should not be exposed publicly as it's too detailed.
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) enum MicEncryptedSectionDeserializationError {
+    /// Plaintext metadata key did not have the expected MAC
+    MetadataKeyMacMismatch,
+    /// Calculated MIC did not match MIC from section
+    MicMismatch,
+    /// Parsing of decrypted DEs failed
+    DeParseError,
+}
+
+/// Decrypt a ciphertext buffer whose first [METADATA_KEY_LEN] bytes of plaintext are, maybe, the
+/// metadata key for an NP identity.
+///
+/// Returns `Some` if decrypting the first [METADATA_KEY_LEN] bytes produces plaintext whose HMAC
+/// matches the expected MAC. Only the first [METADATA_KEY_LEN] bytes are decrypted. The cipher is
+/// returned along with the buffer as it is in the appropriate state to continue decrypting the
+/// remaining ciphertext.
+///
+/// Returns `None` if the plaintext does not match the expected HMAC.
+///
+/// # Panics
+///
+/// Panics if `ciphertext`'s length is not in `[METADATA_KEY_LEN, NP_ADV_MAX_SECTION_LEN]`.
+#[allow(clippy::type_complexity)]
+fn try_decrypt_metadata_key_prefix<C: CryptoProvider>(
+    ciphertext: &[u8],
+    nonce: AesCtrNonce,
+    identity_resolution_material: &SectionIdentityResolutionMaterial,
+) -> Option<(tinyvec::ArrayVec<[u8; NP_ADV_MAX_SECTION_LEN]>, C::AesCtr128)> {
+    assert!(ciphertext.len() <= NP_ADV_MAX_SECTION_LEN);
+    let mut decrypt_buf = tinyvec::ArrayVec::<[u8; NP_ADV_MAX_SECTION_LEN]>::new();
+    let aes_key = &identity_resolution_material.aes_key;
+    let mut cipher = C::AesCtr128::new(aes_key, NonceAndCounter::from_nonce(nonce));
+
+    decrypt_buf.extend_from_slice(ciphertext);
+    cipher.decrypt(&mut decrypt_buf[..METADATA_KEY_LEN]);
+
+    let metadata_key_hmac_key: np_hkdf::NpHmacSha256Key<C> =
+        identity_resolution_material.metadata_key_hmac_key.into();
+    let expected_metadata_key_hmac = identity_resolution_material.expected_metadata_key_hmac;
+    metadata_key_hmac_key
+        .verify_hmac(&decrypt_buf[..METADATA_KEY_LEN], expected_metadata_key_hmac)
+        .ok()
+        .map(|_| (decrypt_buf, cipher))
+}
diff --git a/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/signature_decrypt_tests.rs b/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/signature_decrypt_tests.rs
new file mode 100644
index 0000000..b78cad9
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/deserialize/encrypted_section/signature_decrypt_tests.rs
@@ -0,0 +1,512 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use crate::extended::data_elements::TxPowerDataElement;
+use crate::extended::deserialize::{DecryptedSection, EncryptionInfo, RawV1Salt};
+use crate::shared_data::TxPower;
+use crate::{
+    credential::v1::*,
+    de_type::EncryptedIdentityDataElementType,
+    extended::{
+        deserialize::{
+            encrypted_section::{
+                SignatureEncryptedSection, SignatureEncryptedSectionDeserializationError,
+            },
+            parse_sections,
+            test_stubs::IntermediateSectionExt,
+            CiphertextSection, EncryptedIdentityMetadata, OffsetDataElement, SectionContents,
+            VerificationMode,
+        },
+        section_signature_payload::*,
+        serialize::{
+            AdvBuilder, CapacityLimitedVec, SignedEncrypted, SingleTypeDataElement,
+            WriteDataElement,
+        },
+        NP_ADV_MAX_SECTION_LEN,
+    },
+    parse_adv_header, AdvHeader, Section,
+};
+use array_view::ArrayView;
+use crypto_provider::{aes::ctr::AesCtrNonce, CryptoProvider};
+use crypto_provider_default::CryptoProviderImpl;
+use np_hkdf::v1_salt;
+use np_hkdf::v1_salt::V1Salt;
+use sink::Sink;
+use std::{prelude::rust_2021::*, vec};
+
+type KeyPair = np_ed25519::KeyPair<CryptoProviderImpl>;
+
+#[test]
+fn deserialize_signature_encrypted_correct_keys() {
+    let metadata_key = [1; 16];
+    let key_seed = [2; 32];
+    let raw_salt = RawV1Salt([3; 16]);
+    let section_salt = V1Salt::<CryptoProviderImpl>::from(raw_salt);
+    let identity_type = EncryptedIdentityDataElementType::Private;
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let key_pair = KeyPair::generate();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder
+        .section_builder(SignedEncrypted::new(
+            identity_type,
+            V1Salt::from(*section_salt.as_array_ref()),
+            &metadata_key,
+            &key_pair,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    let txpower_de = TxPowerDataElement::from(TxPower::try_from(7).unwrap());
+    section_builder.add_de(|_| txpower_de.clone()).unwrap();
+
+    section_builder.add_to_advertisement();
+
+    let adv = adv_builder.into_advertisement();
+
+    let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+
+    let adv_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+
+    let sections = parse_sections(&adv_header, remaining).unwrap();
+    assert_eq!(1, sections.len());
+
+    let section = sections.into_iter().next().unwrap();
+    let enc_section = section.as_ciphertext().unwrap();
+    let contents = if let CiphertextSection::SignatureEncryptedIdentity(contents) = &enc_section {
+        contents
+    } else {
+        panic!("incorrect flavor");
+    };
+
+    let mut encryption_info_bytes = [0_u8; 19];
+    encryption_info_bytes[0..2].copy_from_slice(&[0x91, 0x10]);
+    encryption_info_bytes[2] = 0x08;
+    encryption_info_bytes[3..].copy_from_slice(section_salt.as_slice());
+
+    let section_len = 19 + 2 + 16 + 2 + 64;
+    assert_eq!(
+        &SignatureEncryptedSection {
+            section_header: section_len,
+            adv_header: &adv_header,
+            encryption_info: EncryptionInfo { bytes: encryption_info_bytes },
+            identity: EncryptedIdentityMetadata {
+                header_bytes: [0x90, 0x1],
+                offset: 1.into(),
+                identity_type: EncryptedIdentityDataElementType::Private,
+            },
+            // adv header + salt + section header + encryption info + identity header
+            all_ciphertext: &adv.as_slice()[1 + 1 + 19 + 2..],
+        },
+        contents
+    );
+
+    // plaintext is correct
+    {
+        let crypto_material = MinimumFootprintV1CryptoMaterial::new::<CryptoProviderImpl>(
+            key_seed,
+            key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            key_pair.public(),
+        );
+        let signed_identity_resolution_material =
+            crypto_material.signed_identity_resolution_material::<CryptoProviderImpl>();
+        let decrypted = contents
+            .try_decrypt::<CryptoProviderImpl>(&signed_identity_resolution_material)
+            .unwrap();
+
+        let mut expected = metadata_key.as_slice().to_vec();
+        // battery de
+        expected.extend_from_slice(txpower_de.de_header().serialize().as_slice());
+        txpower_de.write_de_contents(&mut expected);
+
+        let nonce: AesCtrNonce = section_salt.derive(Some(1.into())).unwrap();
+
+        let mut encryption_info = vec![0x91, 0x10, 0x08];
+        encryption_info.extend_from_slice(section_salt.as_slice());
+        let encryption_info: [u8; EncryptionInfo::TOTAL_DE_LEN] =
+            encryption_info.try_into().unwrap();
+
+        let sig_payload = SectionSignaturePayload::from_deserialized_parts(
+            0x20,
+            section_len,
+            &encryption_info,
+            &nonce,
+            [0x90, 0x1],
+            &expected,
+        );
+
+        expected.extend_from_slice(&sig_payload.sign(&key_pair).to_bytes());
+
+        assert_eq!(&expected, decrypted.as_slice());
+    }
+
+    // deserialization to Section works
+    {
+        let crypto_material = MinimumFootprintV1CryptoMaterial::new::<CryptoProviderImpl>(
+            key_seed,
+            key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            key_pair.public(),
+        );
+        let signed_identity_resolution_material =
+            crypto_material.signed_identity_resolution_material::<CryptoProviderImpl>();
+        let signed_verification_material =
+            crypto_material.signed_verification_material::<CryptoProviderImpl>();
+
+        let section = contents
+            .try_deserialize::<CryptoProviderImpl>(
+                &signed_identity_resolution_material,
+                &signed_verification_material,
+            )
+            .unwrap();
+
+        assert_eq!(
+            DecryptedSection::new(
+                EncryptedIdentityDataElementType::Private,
+                VerificationMode::Signature,
+                metadata_key,
+                raw_salt,
+                SectionContents {
+                    section_header: 19 + 2 + 16 + 1 + 1 + 64,
+                    // battery DE
+                    de_data: ArrayView::try_from_slice(&[7]).unwrap(),
+                    data_elements: vec![OffsetDataElement {
+                        offset: 2.into(),
+                        de_type: 0x05_u8.into(),
+                        start_of_contents: 0,
+                        contents_len: 1,
+                    }],
+                },
+            ),
+            section
+        );
+
+        assert_eq!(
+            vec![(
+                v1_salt::DataElementOffset::from(2_usize),
+                TxPowerDataElement::DE_TYPE,
+                vec![7u8]
+            )],
+            section
+                .data_elements()
+                .map(|de| (de.offset(), de.de_type(), de.contents().to_vec()))
+                .collect::<Vec<_>>()
+        );
+    }
+}
+
+#[test]
+fn deserialize_signature_encrypted_incorrect_aes_key_error() {
+    // bad aes key -> bad metadata key plaintext
+    do_bad_deserialize_params::<CryptoProviderImpl>(
+        SignatureEncryptedSectionDeserializationError::MetadataKeyMacMismatch,
+        Some([0xFF; 16].into()),
+        None,
+        None,
+        None,
+    );
+}
+
+#[test]
+fn deserialize_signature_encrypted_incorrect_metadata_key_hmac_key_error() {
+    // bad metadata key hmac key -> bad calculated metadata key mac
+    do_bad_deserialize_params::<CryptoProviderImpl>(
+        SignatureEncryptedSectionDeserializationError::MetadataKeyMacMismatch,
+        None,
+        Some([0xFF; 32].into()),
+        None,
+        None,
+    );
+}
+
+#[test]
+fn deserialize_signature_encrypted_incorrect_expected_metadata_key_hmac_error() {
+    // bad expected metadata key mac
+    do_bad_deserialize_params::<CryptoProviderImpl>(
+        SignatureEncryptedSectionDeserializationError::MetadataKeyMacMismatch,
+        None,
+        None,
+        Some([0xFF; 32]),
+        None,
+    );
+}
+
+#[test]
+fn deserialize_signature_encrypted_incorrect_pub_key_error() {
+    // a random pub key will lead to signature mismatch
+    do_bad_deserialize_params::<CryptoProviderImpl>(
+        SignatureEncryptedSectionDeserializationError::SignatureMismatch,
+        None,
+        None,
+        None,
+        Some(KeyPair::generate().public()),
+    );
+}
+
+#[test]
+fn deserialize_signature_encrypted_incorrect_salt_error() {
+    // bad salt -> bad iv -> bad metadata key plaintext
+    do_bad_deserialize_tampered(
+        SignatureEncryptedSectionDeserializationError::MetadataKeyMacMismatch,
+        None,
+        |_| {},
+        |adv_mut| adv_mut[5..21].copy_from_slice(&[0xFF; 16]),
+    )
+}
+
+#[test]
+fn deserialize_signature_encrypted_tampered_signature_error() {
+    do_bad_deserialize_tampered(
+        SignatureEncryptedSectionDeserializationError::SignatureMismatch,
+        None,
+        |_| {},
+        // flip a bit in the middle of the signature
+        |adv_mut| {
+            let len = adv_mut.len();
+            adv_mut[len - 30] ^= 0x1
+        },
+    )
+}
+
+#[test]
+fn deserialize_signature_encrypted_tampered_ciphertext_error() {
+    do_bad_deserialize_tampered(
+        SignatureEncryptedSectionDeserializationError::SignatureMismatch,
+        None,
+        |_| {},
+        // flip a bit outside of the signature
+        |adv_mut| {
+            let len = adv_mut.len();
+            adv_mut[len - 1 - 64] ^= 0x1
+        },
+    )
+}
+
+#[test]
+fn deserialize_signature_encrypted_missing_signature_de_error() {
+    let section_len = 19 + 2 + 16 + 1 + 1;
+    do_bad_deserialize_tampered(
+        SignatureEncryptedSectionDeserializationError::SignatureMissing,
+        Some(section_len),
+        |_| {},
+        |adv_mut| {
+            // chop off signature DE
+            adv_mut.truncate(adv_mut.len() - 64);
+            // fix section length
+            adv_mut[1] = section_len;
+        },
+    )
+}
+
+#[test]
+fn deserialize_signature_encrypted_des_wont_parse() {
+    do_bad_deserialize_tampered(
+        SignatureEncryptedSectionDeserializationError::DeParseError,
+        Some(19 + 2 + 16 + 1 + 1 + 64 + 1),
+        // add an impossible DE
+        |section| section.try_push(0xFF).unwrap(),
+        |_| {},
+    )
+}
+
+/// Attempt a deserialization that will fail when using the provided parameters for decryption only.
+/// `None` means use the correct value for that parameter.
+fn do_bad_deserialize_params<C: CryptoProvider>(
+    error: SignatureEncryptedSectionDeserializationError,
+    aes_key: Option<crypto_provider::aes::Aes128Key>,
+    metadata_key_hmac_key: Option<np_hkdf::NpHmacSha256Key<C>>,
+    expected_metadata_key_hmac: Option<[u8; 32]>,
+    pub_key: Option<np_ed25519::PublicKey<C>>,
+) {
+    let metadata_key = [1; 16];
+    let key_seed = [2; 32];
+    let section_salt: v1_salt::V1Salt<C> = [3; 16].into();
+    let identity_type = EncryptedIdentityDataElementType::Private;
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::new(&key_seed);
+    let key_pair = np_ed25519::KeyPair::<C>::generate();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder
+        .section_builder(SignedEncrypted::new(
+            identity_type,
+            section_salt,
+            &metadata_key,
+            &key_pair,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    section_builder.add_de_res(|_| TxPower::try_from(2).map(TxPowerDataElement::from)).unwrap();
+
+    section_builder.add_to_advertisement();
+
+    let adv = adv_builder.into_advertisement();
+
+    let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+
+    let v1_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+
+    let sections = parse_sections(&v1_header, remaining).unwrap();
+    assert_eq!(1, sections.len());
+
+    let section = sections.into_iter().next().unwrap();
+    let enc_section = section.as_ciphertext().unwrap();
+    let contents = if let CiphertextSection::SignatureEncryptedIdentity(contents) = &enc_section {
+        contents
+    } else {
+        panic!("incorrect flavor");
+    };
+
+    let signed_identity_resolution_material =
+        SignedSectionIdentityResolutionMaterial::from_raw(SectionIdentityResolutionMaterial {
+            aes_key: aes_key.unwrap_or_else(|| key_seed_hkdf.extended_signed_section_aes_key()),
+
+            metadata_key_hmac_key: *metadata_key_hmac_key
+                .unwrap_or_else(|| key_seed_hkdf.extended_signed_metadata_key_hmac_key())
+                .as_bytes(),
+            expected_metadata_key_hmac: expected_metadata_key_hmac.unwrap_or_else(|| {
+                key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key)
+            }),
+        });
+
+    let signed_verification_material = SignedSectionVerificationMaterial {
+        pub_key: pub_key.unwrap_or_else(|| key_pair.public()).to_bytes(),
+    };
+
+    assert_eq!(
+        error,
+        contents
+            .try_deserialize::<C>(
+                &signed_identity_resolution_material,
+                &signed_verification_material,
+            )
+            .unwrap_err()
+    );
+}
+
+/// Run a test that mangles the advertisement contents before attempting to deserialize.
+///
+/// Since the advertisement is ciphertext, only changes outside
+fn do_bad_deserialize_tampered<
+    A: Fn(&mut Vec<u8>),
+    S: Fn(&mut CapacityLimitedVec<u8, NP_ADV_MAX_SECTION_LEN>),
+>(
+    expected_error: SignatureEncryptedSectionDeserializationError,
+    expected_section_len: Option<u8>,
+    mangle_section: S,
+    mangle_adv_contents: A,
+) {
+    let metadata_key = [1; 16];
+    let key_seed = [2; 32];
+    let section_salt: v1_salt::V1Salt<CryptoProviderImpl> = [3; 16].into();
+    let identity_type = EncryptedIdentityDataElementType::Private;
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::new(&key_seed);
+    let key_pair = KeyPair::generate();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder
+        .section_builder(SignedEncrypted::new(
+            identity_type,
+            section_salt,
+            &metadata_key,
+            &key_pair,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    section_builder.add_de_res(|_| TxPower::try_from(2).map(TxPowerDataElement::from)).unwrap();
+
+    mangle_section(&mut section_builder.section);
+
+    section_builder.add_to_advertisement();
+
+    let adv = adv_builder.into_advertisement();
+    let mut adv_mut = adv.as_slice().to_vec();
+    mangle_adv_contents(&mut adv_mut);
+
+    let (remaining, header) = parse_adv_header(&adv_mut).unwrap();
+
+    let adv_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+
+    let sections = parse_sections(&adv_header, remaining).unwrap();
+    assert_eq!(1, sections.len());
+
+    let section = sections.into_iter().next().unwrap();
+    let enc_section = section.as_ciphertext().unwrap();
+    let contents = if let CiphertextSection::SignatureEncryptedIdentity(contents) = &enc_section {
+        contents
+    } else {
+        panic!("incorrect flavor");
+    };
+
+    let mut encryption_info_bytes = [0_u8; 19];
+    encryption_info_bytes[0..2].copy_from_slice(&[0x91, 0x10]);
+    encryption_info_bytes[2] = 0x08;
+    encryption_info_bytes[3..].copy_from_slice(&adv_mut[5..21]);
+
+    let section_len = 19 + 2 + 16 + 2 + 64;
+    assert_eq!(
+        &SignatureEncryptedSection {
+            section_header: expected_section_len.unwrap_or(section_len),
+            adv_header: &adv_header,
+            encryption_info: EncryptionInfo { bytes: encryption_info_bytes },
+            identity: EncryptedIdentityMetadata {
+                header_bytes: [0x90, 0x1],
+                offset: 1.into(),
+                identity_type: EncryptedIdentityDataElementType::Private,
+            },
+            all_ciphertext: &adv_mut[1 + 1 + 19 + 2..],
+        },
+        contents
+    );
+
+    let crypto_material = MinimumFootprintV1CryptoMaterial::new::<CryptoProviderImpl>(
+        key_seed,
+        key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+        key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+        key_pair.public(),
+    );
+    let identity_resolution_material =
+        crypto_material.signed_identity_resolution_material::<CryptoProviderImpl>();
+    let verification_material =
+        crypto_material.signed_verification_material::<CryptoProviderImpl>();
+
+    assert_eq!(
+        expected_error,
+        contents
+            .try_deserialize::<CryptoProviderImpl>(
+                &identity_resolution_material,
+                &verification_material,
+            )
+            .unwrap_err()
+    );
+}
diff --git a/nearby/presence/np_adv/src/extended/deserialize/mod.rs b/nearby/presence/np_adv/src/extended/deserialize/mod.rs
new file mode 100644
index 0000000..1829ad6
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/deserialize/mod.rs
@@ -0,0 +1,835 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Deserialization for V1 advertisement contents
+
+extern crate alloc;
+
+use alloc::vec::Vec;
+use core::array::TryFromSliceError;
+use core::borrow::Borrow;
+use core::slice;
+
+use nom::{branch, bytes, combinator, error, multi, number, sequence};
+use strum::IntoEnumIterator as _;
+
+use array_view::ArrayView;
+use crypto_provider::CryptoProvider;
+use np_hkdf::v1_salt::{self, V1Salt};
+
+use crate::extended::NP_V1_ADV_MAX_SECTION_COUNT;
+use crate::{
+    credential::{v1::*, V1Credential},
+    de_type::{EncryptedIdentityDataElementType, IdentityDataElementType},
+    extended::{
+        data_elements::{MIC_ENCRYPTION_SCHEME, SIGNATURE_ENCRYPTION_SCHEME},
+        de_type::{DeType, ExtendedDataElementType as _},
+        deserialize::encrypted_section::{
+            MicEncryptedSection, MicEncryptedSectionDeserializationError,
+            SignatureEncryptedSection, SignatureEncryptedSectionDeserializationError,
+        },
+        to_array_view, DeLength, ENCRYPTION_INFO_DE_TYPE, METADATA_KEY_LEN, NP_ADV_MAX_SECTION_LEN,
+    },
+    PlaintextIdentityMode, V1Header,
+};
+
+mod encrypted_section;
+
+#[cfg(test)]
+mod parse_tests;
+
+#[cfg(test)]
+mod section_tests;
+
+#[cfg(test)]
+mod test_stubs;
+
+/// Parse into [IntermediateSection]s, exposing the underlying parsing errors.
+/// Consumes all of `adv_body`.
+pub(crate) fn parse_sections<'a, 'h: 'a>(
+    adv_header: &'h V1Header,
+    adv_body: &'a [u8],
+) -> Result<Vec<IntermediateSection<'a>>, nom::Err<error::Error<&'a [u8]>>> {
+    combinator::all_consuming(multi::many_m_n(
+        1,
+        NP_V1_ADV_MAX_SECTION_COUNT,
+        IntermediateSection::parser_with_header(adv_header),
+    ))(adv_body)
+    .map(|(_rem, sections)| sections)
+}
+
+/// A partially processed section that hasn't been decrypted (if applicable) yet.
+#[derive(PartialEq, Eq, Debug)]
+// sections are large because they have a stack allocated buffer for the whole section
+#[allow(clippy::large_enum_variant)]
+pub(crate) enum IntermediateSection<'a> {
+    /// A section that was not encrypted, e.g. a public identity or no-identity section.
+    Plaintext(PlaintextSection),
+    /// A section whose contents were encrypted, e.g. a private identity section.
+    Ciphertext(CiphertextSection<'a>),
+}
+
+impl<'a> IntermediateSection<'a> {
+    fn parser_with_header(
+        adv_header: &'a V1Header,
+    ) -> impl Fn(&'a [u8]) -> nom::IResult<&[u8], IntermediateSection> {
+        move |adv_body| {
+            let (remaining, section_contents_len) =
+                combinator::verify(number::complete::u8, |sec_len| {
+                    *sec_len as usize <= NP_ADV_MAX_SECTION_LEN && *sec_len as usize > 0
+                })(adv_body)?;
+
+            // Section structure possibilities:
+            // - Public Identity DE, all other DEs
+            // - No identity DE, all other DEs (including Salt, excluding identity DEs)
+            // - Encryption information, non-public Identity header, ciphertext
+            // - MIC, encryption information, non-public Identity header, ciphertext
+
+            let parse_public_identity = combinator::map(
+                // 1 starting offset because of public identity before it
+                sequence::tuple((PublicIdentity::parse, parse_non_identity_des(1))),
+                // move closure to copy section_len into scope
+                move |(_identity, des)| {
+                    IntermediateSection::Plaintext(PlaintextSection::new(
+                        PlaintextIdentityMode::Public,
+                        SectionContents::new(/* section_header */ section_contents_len, &des),
+                    ))
+                },
+            );
+
+            // 0 starting offset because there's no identity DE
+            let parse_no_identity_de = combinator::map(parse_non_identity_des(0), move |des| {
+                IntermediateSection::Plaintext(PlaintextSection::new(
+                    PlaintextIdentityMode::None,
+                    SectionContents::new(/* section_header */ section_contents_len, &des),
+                ))
+            });
+
+            let parse_encrypted_identity = combinator::map(
+                sequence::tuple((
+                    EncryptionInfo::parse_signature,
+                    combinator::verify(
+                        combinator::consumed(sequence::tuple((
+                            EncryptedIdentityMetadata::parser_at_offset(
+                                v1_salt::DataElementOffset::from(1),
+                            ),
+                            combinator::rest,
+                        ))),
+                        // should be trivially true since section length was checked above,
+                        // but this is an invariant for EncryptedSection, so we double check
+                        |(identity_and_ciphertext, _tuple)| {
+                            (METADATA_KEY_LEN..=NP_ADV_MAX_SECTION_LEN)
+                                .contains(&identity_and_ciphertext.len())
+                        },
+                    ),
+                )),
+                move |(encryption_info, (identity_and_ciphertext, (identity, _des_ciphertext)))| {
+                    // skip identity de header -- rest of that de is ciphertext
+                    let to_skip = identity.header_bytes.len();
+                    IntermediateSection::Ciphertext(CiphertextSection::SignatureEncryptedIdentity(
+                        SignatureEncryptedSection {
+                            section_header: section_contents_len,
+                            adv_header,
+                            encryption_info,
+                            identity,
+                            all_ciphertext: &identity_and_ciphertext[to_skip..],
+                        },
+                    ))
+                },
+            );
+
+            let parse_mic_encrypted_identity = combinator::map(
+                sequence::tuple((
+                    EncryptionInfo::parse_mic,
+                    combinator::verify(
+                        combinator::consumed(sequence::tuple((
+                            EncryptedIdentityMetadata::parser_at_offset(
+                                v1_salt::DataElementOffset::from(1),
+                            ),
+                            combinator::rest,
+                        ))),
+                        // Should be trivially true since section length was checked above,
+                        // but this is an invariant for MicEncryptedSection, so we double check.
+                        // Also verify that there is enough space at the end to contain a valid-length MIC.
+                        |(identity_ciphertext_and_mic, _tuple)| {
+                            (METADATA_KEY_LEN + SectionMic::CONTENTS_LEN..=NP_ADV_MAX_SECTION_LEN)
+                                .contains(&identity_ciphertext_and_mic.len())
+                        },
+                    ),
+                )),
+                move |(
+                    encryption_info,
+                    (identity_ciphertext_and_mic, (identity, _ciphertext_and_mic)),
+                )| {
+                    // should not panic since we have already ensured a valid length
+                    let (identity_and_ciphertext, mic) = identity_ciphertext_and_mic
+                        .split_at(identity_ciphertext_and_mic.len() - SectionMic::CONTENTS_LEN);
+                    // skip identity de header -- rest of that de is ciphertext
+                    let to_skip = identity.header_bytes.len();
+                    IntermediateSection::Ciphertext(CiphertextSection::MicEncryptedIdentity(
+                        MicEncryptedSection {
+                            section_header: section_contents_len,
+                            adv_header,
+                            mic: mic.try_into().unwrap_or_else(|_| {
+                                panic!("{} is a valid length", SectionMic::CONTENTS_LEN)
+                            }),
+                            encryption_info,
+                            identity,
+                            all_ciphertext: &identity_and_ciphertext[to_skip..],
+                        },
+                    ))
+                },
+            );
+
+            combinator::map_parser(
+                bytes::complete::take(section_contents_len),
+                // guarantee we consume all of the section (not all of the adv body)
+                combinator::all_consuming(branch::alt((
+                    parse_mic_encrypted_identity,
+                    parse_encrypted_identity,
+                    parse_public_identity,
+                    parse_no_identity_de,
+                ))),
+            )(remaining)
+        }
+    }
+}
+
+#[derive(PartialEq, Eq, Debug)]
+struct SectionContents {
+    section_header: u8,
+    de_data: ArrayView<u8, NP_ADV_MAX_SECTION_LEN>,
+    data_elements: Vec<OffsetDataElement>,
+}
+
+impl SectionContents {
+    fn new(section_header: u8, data_elements: &[RefDataElement]) -> Self {
+        let (data_elements, de_data) = convert_data_elements(data_elements);
+
+        Self { section_header, de_data, data_elements }
+    }
+
+    fn data_elements(&'_ self) -> DataElements<'_> {
+        DataElements { de_iter: self.data_elements.iter(), de_data: &self.de_data }
+    }
+}
+
+/// An iterator over data elements in a V1 section
+// A concrete type to make it easy to refer to in return types where opaque types aren't available.
+pub struct DataElements<'a> {
+    de_iter: slice::Iter<'a, OffsetDataElement>,
+    de_data: &'a ArrayView<u8, NP_ADV_MAX_SECTION_LEN>,
+}
+
+impl<'a> Iterator for DataElements<'a> {
+    type Item = DataElement<'a>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.de_iter.next().map(|de| DataElement { de_data: self.de_data, de })
+    }
+}
+
+/// A section deserialized from a V1 advertisement.
+pub trait Section {
+    /// The iterator type used to iterate over data elements
+    type Iterator<'a>: Iterator<Item = DataElement<'a>>
+    where
+        Self: 'a;
+
+    /// Iterator over the data elements in a section, except for any DEs related to resolving the
+    /// identity or otherwise validating the payload (e.g. MIC, Signature, any identity DEs like
+    /// Private Identity).
+    fn data_elements(&'_ self) -> Self::Iterator<'_>;
+}
+
+/// A plaintext section deserialized from a V1 advertisement.
+#[derive(PartialEq, Eq, Debug)]
+pub struct PlaintextSection {
+    identity: PlaintextIdentityMode,
+    contents: SectionContents,
+}
+
+impl PlaintextSection {
+    fn new(identity: PlaintextIdentityMode, contents: SectionContents) -> Self {
+        Self { identity, contents }
+    }
+
+    /// The identity mode for the section.
+    ///
+    /// Since plaintext sections do not use encryption, they cannot be matched to a single identity,
+    /// and only have a mode (no identity or public).
+    pub fn identity(&self) -> PlaintextIdentityMode {
+        self.identity
+    }
+}
+
+impl Section for PlaintextSection {
+    type Iterator<'a>  = DataElements<'a> where Self: 'a;
+
+    fn data_elements(&'_ self) -> Self::Iterator<'_> {
+        self.contents.data_elements()
+    }
+}
+
+/// A byte buffer the size of a V1 salt.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct RawV1Salt([u8; 16]);
+
+impl RawV1Salt {
+    /// Returns the raw salt bytes as a vec.
+    #[cfg(feature = "devtools")]
+    pub fn to_vec(&self) -> Vec<u8> {
+        self.0.to_vec()
+    }
+}
+
+impl<C: CryptoProvider> From<RawV1Salt> for V1Salt<C> {
+    fn from(raw_salt: RawV1Salt) -> Self {
+        raw_salt.0.into()
+    }
+}
+
+/// The decrypted contents of a ciphertext section.
+#[derive(Debug, PartialEq, Eq)]
+pub struct DecryptedSection {
+    identity_type: EncryptedIdentityDataElementType,
+    verification_mode: VerificationMode,
+    metadata_key: [u8; METADATA_KEY_LEN],
+    salt: RawV1Salt,
+    contents: SectionContents,
+}
+
+impl DecryptedSection {
+    fn new(
+        identity_type: EncryptedIdentityDataElementType,
+        verification_mode: VerificationMode,
+        metadata_key: [u8; 16],
+        salt: RawV1Salt,
+        contents: SectionContents,
+    ) -> Self {
+        Self { identity_type, verification_mode, metadata_key, salt, contents }
+    }
+
+    /// The type of identity DE used in the section.
+    pub fn identity_type(&self) -> EncryptedIdentityDataElementType {
+        self.identity_type
+    }
+
+    /// The verification mode used in the section.
+    pub fn verification_mode(&self) -> VerificationMode {
+        self.verification_mode
+    }
+
+    /// The decrypted metadata key from the identity DE.
+    pub fn metadata_key(&self) -> &[u8; 16] {
+        &self.metadata_key
+    }
+
+    /// The salt used for decryption of this advertisement.
+    pub fn salt(&self) -> RawV1Salt {
+        self.salt
+    }
+}
+
+impl Section for DecryptedSection {
+    type Iterator<'a>  = DataElements<'a> where Self: 'a;
+
+    fn data_elements(&'_ self) -> Self::Iterator<'_> {
+        self.contents.data_elements()
+    }
+}
+
+#[derive(PartialEq, Eq, Debug)]
+pub(crate) enum CiphertextSection<'a> {
+    SignatureEncryptedIdentity(SignatureEncryptedSection<'a>),
+    MicEncryptedIdentity(MicEncryptedSection<'a>),
+}
+
+impl<'a> CiphertextSection<'a> {
+    pub(crate) fn try_deserialize<'c, C, P>(
+        &'a self,
+        credential: &'c C,
+    ) -> Result<DecryptedSection, SectionDeserializeError>
+    where
+        C: V1Credential,
+        P: CryptoProvider,
+    {
+        let crypto_material = credential.crypto_material();
+        match self {
+            Self::SignatureEncryptedIdentity(contents) => {
+                let identity_resolution_material =
+                    crypto_material.signed_identity_resolution_material::<P>();
+                let verification_material = crypto_material.signed_verification_material::<P>();
+
+                contents
+                    .try_deserialize::<P>(
+                        identity_resolution_material.borrow(),
+                        &verification_material,
+                    )
+                    .map_err(|e| match e {
+                        SignatureEncryptedSectionDeserializationError::MetadataKeyMacMismatch
+                        | SignatureEncryptedSectionDeserializationError::SignatureMismatch => {
+                            SectionDeserializeError::IncorrectCredential
+                        }
+                        SignatureEncryptedSectionDeserializationError::SignatureMissing
+                        | SignatureEncryptedSectionDeserializationError::DeParseError => {
+                            SectionDeserializeError::ParseError
+                        }
+                    })
+            }
+            Self::MicEncryptedIdentity(contents) => {
+                let identity_resolution_material =
+                    crypto_material.unsigned_identity_resolution_material::<P>();
+                let verification_material = crypto_material.unsigned_verification_material::<P>();
+
+                contents
+                    .try_deserialize::<P>(
+                        identity_resolution_material.borrow(),
+                        &verification_material,
+                    )
+                    .map_err(|e| match e {
+                        MicEncryptedSectionDeserializationError::MetadataKeyMacMismatch
+                        | MicEncryptedSectionDeserializationError::MicMismatch => {
+                            SectionDeserializeError::IncorrectCredential
+                        }
+                        MicEncryptedSectionDeserializationError::DeParseError => {
+                            SectionDeserializeError::ParseError
+                        }
+                    })
+            }
+        }
+    }
+}
+
+/// Errors that can occur when deserializing an advertisement
+#[derive(Debug, PartialEq, Eq)]
+pub enum SectionDeserializeError {
+    /// The credential supplied did not match the section's identity data
+    IncorrectCredential,
+    /// Section data is malformed
+    ParseError,
+}
+
+/// Returns a parser function that parses data elements whose type is not one of the known identity
+/// DE types, and whose offsets start from the provided `starting_offset`.
+///
+/// Consumes all input.
+fn parse_non_identity_des(
+    starting_offset: usize,
+) -> impl Fn(&[u8]) -> nom::IResult<&[u8], Vec<RefDataElement>> {
+    move |input: &[u8]| {
+        combinator::map_opt(
+            combinator::all_consuming(multi::many0(combinator::verify(
+                ProtoDataElement::parse,
+                |de| IdentityDataElementType::iter().all(|t| t.type_code() != de.header.de_type),
+            ))),
+            |proto_des| {
+                proto_des
+                    .into_iter()
+                    .enumerate()
+                    .map(|(offset, pde)| starting_offset.checked_add(offset).map(|sum| (sum, pde)))
+                    .map(|res| {
+                        res.map(|(offset, pde)| {
+                            pde.into_data_element(v1_salt::DataElementOffset::from(offset))
+                        })
+                    })
+                    .collect::<Option<Vec<_>>>()
+            },
+        )(input)
+    }
+}
+
+/// Deserialize-specific version of a DE header that incorporates the header length.
+/// This is needed for encrypted identities that need to construct a slice of everything in the
+/// section following the identity DE header.
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub(crate) struct DeHeader {
+    /// The original bytes of the header, at most 6 bytes long (1 byte len, 5 bytes type)
+    pub(crate) header_bytes: ArrayView<u8, 6>,
+    pub(crate) de_type: DeType,
+    pub(crate) contents_len: DeLength,
+}
+
+impl DeHeader {
+    pub(crate) fn parse(input: &[u8]) -> nom::IResult<&[u8], DeHeader> {
+        // 1-byte header: 0b0LLLTTTT
+        let parse_single_byte_de_header =
+            combinator::map_opt::<&[u8], _, DeHeader, error::Error<&[u8]>, _, _>(
+                combinator::consumed(combinator::map_res(
+                    combinator::verify(number::complete::u8, |&b| !hi_bit_set(b)),
+                    |b| {
+                        // L bits
+                        let len = (b >> 4) & 0x07;
+                        // T bits
+                        let de_type = ((b & 0x0F) as u32).into();
+
+                        len.try_into().map(|l| (l, de_type))
+                    },
+                )),
+                |(header_bytes, (len, de_type))| {
+                    ArrayView::try_from_slice(header_bytes).map(|header_bytes| DeHeader {
+                        header_bytes,
+                        contents_len: len,
+                        de_type,
+                    })
+                },
+            );
+
+        // multi-byte headers: 0b1LLLLLLL (0b1TTTTTTT)* 0b0TTTTTTT
+        // leading 1 in first byte = multibyte format
+        // leading 1 in subsequent bytes = there is at least 1 more type bytes
+        // leading 0 = this is the last header byte
+        // 127-bit length, effectively infinite type bit length
+
+        // It's conceivable to have non-canonical extended type sequences where 1 or more leading
+        // bytes don't have any bits set (other than the marker hi bit), thereby contributing nothing
+        // to the final value.
+        // To prevent that, we require that either there be only 1 type byte, or that the first of the
+        // multiple type bytes must have a value bit set. It's OK to have no value bits in subsequent
+        // type bytes.
+
+        let parse_ext_de_header = combinator::map_opt(
+            combinator::consumed(sequence::pair(
+                // length byte w/ leading 1
+                combinator::map_res(
+                    combinator::verify(number::complete::u8::<&[u8], _>, |&b| hi_bit_set(b)),
+                    // snag the lower 7 bits
+                    |b| (b & 0x7F).try_into(),
+                ),
+                branch::alt((
+                    // 1 type byte case
+                    combinator::recognize(
+                        // 0-hi-bit type code byte
+                        combinator::verify(number::complete::u8, |&b| !hi_bit_set(b)),
+                    ),
+                    // multiple type byte case: leading type byte must have at least 1 value bit
+                    combinator::recognize(sequence::tuple((
+                        // hi bit and at least 1 value bit, otherwise it would be non-canonical
+                        combinator::verify(number::complete::u8, |&b| {
+                            hi_bit_set(b) && (b & 0x7F != 0)
+                        }),
+                        // 0-3 1-hi-bit type code bytes with any bit pattern. Max is 3 since two 7
+                        // bit type chunks are processed before and after this, for a total of 5,
+                        // and that's as many 7-bit chunks as are needed to support a 32-bit type.
+                        bytes::complete::take_while_m_n(0, 3, hi_bit_set),
+                        // final 0-hi-bit type code byte
+                        combinator::verify(number::complete::u8, |&b| !hi_bit_set(b)),
+                    ))),
+                )),
+            )),
+            |(header_bytes, (len, type_bytes))| {
+                // snag the low 7 bits of each type byte and accumulate
+
+                type_bytes
+                    .iter()
+                    .fold(Some(0_u32), |accum, b| {
+                        accum.and_then(|n| n.checked_shl(7)).map(|n| n + ((b & 0x7F) as u32))
+                    })
+                    .and_then(|type_code| {
+                        ArrayView::try_from_slice(header_bytes).map(|header_bytes| DeHeader {
+                            header_bytes,
+                            contents_len: len,
+                            de_type: type_code.into(),
+                        })
+                    })
+            },
+        );
+
+        branch::alt((parse_single_byte_de_header, parse_ext_de_header))(input)
+    }
+}
+
+/// An intermediate stage in parsing a [DataElement] that lacks `offset`.
+#[derive(Debug, PartialEq, Eq)]
+struct ProtoDataElement<'d> {
+    header: DeHeader,
+    /// `len()` must equal `header.contents_len`
+    contents: &'d [u8],
+}
+
+impl<'d> ProtoDataElement<'d> {
+    fn parse(input: &[u8]) -> nom::IResult<&[u8], ProtoDataElement> {
+        let (remaining, header) = DeHeader::parse(input)?;
+        let len = header.contents_len;
+        combinator::map(bytes::complete::take(len.as_usize()), move |slice| {
+            let header_clone = header.clone();
+            ProtoDataElement { header: header_clone, contents: slice }
+        })(remaining)
+    }
+
+    fn into_data_element(self, offset: v1_salt::DataElementOffset) -> RefDataElement<'d> {
+        RefDataElement {
+            offset,
+            header_len: self.header.header_bytes.len().try_into().expect("header is <= 6 bytes"),
+            de_type: self.header.de_type,
+            contents: self.contents,
+        }
+    }
+}
+
+/// A data element that holds a slice reference for its contents
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) struct RefDataElement<'d> {
+    pub(crate) offset: v1_salt::DataElementOffset,
+    pub(crate) header_len: u8,
+    pub(crate) de_type: DeType,
+    pub(crate) contents: &'d [u8],
+}
+
+/// A deserialized data element in a section.
+///
+/// The DE has been processed to the point of exposing a DE type and its contents as a `&[u8]`, but
+/// no DE-type-specific processing has been performed.
+#[derive(Debug)]
+pub struct DataElement<'a> {
+    de_data: &'a ArrayView<u8, NP_ADV_MAX_SECTION_LEN>,
+    de: &'a OffsetDataElement,
+}
+
+impl<'a> DataElement<'a> {
+    /// The offset of the DE in its containing Section.
+    ///
+    /// Used with the section salt to derive per-DE salt.
+    pub fn offset(&self) -> v1_salt::DataElementOffset {
+        self.de.offset
+    }
+    /// The type of the DE
+    pub fn de_type(&self) -> DeType {
+        self.de.de_type
+    }
+    /// The contents of the DE
+    pub fn contents(&self) -> &[u8] {
+        &self.de_data.as_slice()
+            [self.de.start_of_contents..self.de.start_of_contents + self.de.contents_len]
+    }
+}
+
+/// The level of integrity protection in an encrypted section
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub enum VerificationMode {
+    /// A symmetric MIC (message integrity code aka message authentication code) was verified.
+    ///
+    /// Since this is a symmetric operation, holders of the key material needed to verify a MIC
+    /// can also forge MICs.
+    Mic,
+    /// An asymmetric signature was verified.
+    ///
+    /// Since this is an asymmetric operation, only the holder of the private key can generate
+    /// signatures, so it offers a stronger level of authenticity protection than [Self::Mic].
+    Signature,
+}
+
+/// The identity used to successfully decrypt and validate an encrypted section
+#[derive(Clone, PartialEq, Eq, Debug)]
+pub struct EncryptedSectionIdentity {
+    identity_type: EncryptedIdentityDataElementType,
+    validation_mode: VerificationMode,
+    metadata_key: [u8; METADATA_KEY_LEN],
+}
+
+impl EncryptedSectionIdentity {
+    /// The type of identity DE used in the section
+    pub fn identity_type(&self) -> EncryptedIdentityDataElementType {
+        self.identity_type
+    }
+    /// The validation mode used when decrypting and verifying the section
+    pub fn verification_mode(&self) -> VerificationMode {
+        self.validation_mode
+    }
+    /// The decrypted metadata key from the section's identity DE
+    pub fn metadata_key(&self) -> &[u8; METADATA_KEY_LEN] {
+        &self.metadata_key
+    }
+}
+
+/// A DE that designates its contents via offset and length to avoid self-referential slices.
+#[derive(Debug, PartialEq, Eq)]
+struct OffsetDataElement {
+    offset: v1_salt::DataElementOffset,
+    de_type: DeType,
+    start_of_contents: usize,
+    contents_len: usize,
+}
+
+/// Convert data elements from holding slices to holding offsets and lengths to avoid
+/// lifetime woes.
+/// This entails some data copying, so if it causes noticeable perf issues we can revisit
+/// it, but it is likely to be much cheaper than decryption.
+///
+/// # Panics
+///
+/// Will panic if handed more data elements than fit in one section. This is only possible if
+/// generating data elements from a source other than parsing a section.
+fn convert_data_elements(
+    elements: &[RefDataElement],
+) -> (Vec<OffsetDataElement>, ArrayView<u8, NP_ADV_MAX_SECTION_LEN>) {
+    let mut buf = tinyvec::ArrayVec::new();
+
+    (
+        elements
+            .iter()
+            .map(|de| {
+                let current_len = buf.len();
+                // won't overflow because these DEs originally came from a section, and now
+                // we're packing only their contents without DE headers
+                buf.extend_from_slice(de.contents);
+                OffsetDataElement {
+                    offset: de.offset,
+                    de_type: de.de_type,
+                    start_of_contents: current_len,
+                    contents_len: de.contents.len(),
+                }
+            })
+            .collect(),
+        to_array_view(buf),
+    )
+}
+
+#[derive(PartialEq, Eq, Debug, Clone)]
+pub(crate) struct EncryptionInfo {
+    pub bytes: [u8; 19],
+}
+
+impl EncryptionInfo {
+    // 2-byte header, 1-byte encryption scheme, 16-byte salt
+    pub(crate) const TOTAL_DE_LEN: usize = 19;
+    const CONTENTS_LEN: usize = 17;
+    const ENCRYPTION_INFO_SCHEME_MASK: u8 = 0b01111000;
+
+    fn parse_signature(input: &[u8]) -> nom::IResult<&[u8], EncryptionInfo> {
+        Self::parser_for_scheme(SIGNATURE_ENCRYPTION_SCHEME)(input)
+    }
+
+    fn parse_mic(input: &[u8]) -> nom::IResult<&[u8], EncryptionInfo> {
+        Self::parser_for_scheme(MIC_ENCRYPTION_SCHEME)(input)
+    }
+
+    fn parser_for_scheme(
+        expected_scheme: u8,
+    ) -> impl Fn(&[u8]) -> nom::IResult<&[u8], EncryptionInfo> {
+        move |input| {
+            combinator::map_res(
+                combinator::consumed(combinator::map_parser(
+                    combinator::map(
+                        combinator::verify(ProtoDataElement::parse, |de| {
+                            de.header.de_type == ENCRYPTION_INFO_DE_TYPE
+                                && de.contents.len() == Self::CONTENTS_LEN
+                        }),
+                        |de| de.contents,
+                    ),
+                    sequence::tuple((
+                        combinator::verify(number::complete::be_u8, |scheme: &u8| {
+                            expected_scheme == (Self::ENCRYPTION_INFO_SCHEME_MASK & scheme)
+                        }),
+                        bytes::complete::take(16_usize),
+                    )),
+                )),
+                |(bytes, _contents)| bytes.try_into(),
+            )(input)
+        }
+    }
+
+    fn salt(&self) -> RawV1Salt {
+        // should never panic
+        RawV1Salt(self.bytes[Self::TOTAL_DE_LEN - 16..].try_into().ok().unwrap())
+    }
+}
+
+impl TryFrom<&[u8]> for EncryptionInfo {
+    type Error = TryFromSliceError;
+
+    fn try_from(value: &[u8]) -> Result<Self, Self::Error> {
+        value.try_into().map(|fixed_bytes: [u8; 19]| Ok(Self { bytes: fixed_bytes }))?
+    }
+}
+
+#[derive(PartialEq, Eq, Debug)]
+pub(crate) struct SectionMic {
+    mic: [u8; 16],
+}
+
+impl SectionMic {
+    // 16-byte metadata key
+    pub(crate) const CONTENTS_LEN: usize = 16;
+}
+
+impl From<[u8; 16]> for SectionMic {
+    fn from(value: [u8; 16]) -> Self {
+        SectionMic { mic: value }
+    }
+}
+
+impl TryFrom<&[u8]> for SectionMic {
+    type Error = TryFromSliceError;
+
+    fn try_from(value: &[u8]) -> Result<Self, Self::Error> {
+        let fixed_bytes: [u8; SectionMic::CONTENTS_LEN] = value.try_into()?;
+        Ok(Self { mic: fixed_bytes })
+    }
+}
+
+#[derive(PartialEq, Eq, Debug)]
+struct PublicIdentity;
+
+impl PublicIdentity {
+    fn parse(input: &[u8]) -> nom::IResult<&[u8], PublicIdentity> {
+        combinator::map(
+            combinator::verify(DeHeader::parse, |deh| {
+                deh.de_type == IdentityDataElementType::Public.type_code()
+                    && deh.contents_len.as_usize() == 0
+            }),
+            |_| PublicIdentity,
+        )(input)
+    }
+}
+
+/// Parsed form of an encrypted identity DE before its contents are decrypted.
+/// Metadata key is stored in the enclosing section.
+#[derive(PartialEq, Eq, Debug)]
+pub(crate) struct EncryptedIdentityMetadata {
+    pub(crate) offset: v1_salt::DataElementOffset,
+    /// The original DE header from the advertisement.
+    /// Encrypted identity should always be a len=2 header.
+    pub(crate) header_bytes: [u8; 2],
+    pub(crate) identity_type: EncryptedIdentityDataElementType,
+}
+
+impl EncryptedIdentityMetadata {
+    // 2-byte header, 16-byte metadata key
+    pub(crate) const TOTAL_DE_LEN: usize = 18;
+
+    /// Returns a parser function that parses an [EncryptedIdentity] using the provided DE `offset`.
+    fn parser_at_offset(
+        offset: v1_salt::DataElementOffset,
+    ) -> impl Fn(&[u8]) -> nom::IResult<&[u8], EncryptedIdentityMetadata> {
+        move |input| {
+            combinator::map_opt(ProtoDataElement::parse, |de| {
+                EncryptedIdentityDataElementType::from_type_code(de.header.de_type).and_then(
+                    |identity_type| {
+                        de.header.header_bytes.as_slice().try_into().ok().and_then(|header_bytes| {
+                            de.contents.try_into().ok().map(|_metadata_key_ciphertext: [u8; 16]| {
+                                // ensure the ciphertext is the right size, then discard
+                                EncryptedIdentityMetadata { header_bytes, offset, identity_type }
+                            })
+                        })
+                    },
+                )
+            })(input)
+        }
+    }
+}
+
+fn hi_bit_set(b: u8) -> bool {
+    b & 0x80 > 0
+}
diff --git a/nearby/presence/np_adv/src/extended/deserialize/parse_tests.rs b/nearby/presence/np_adv/src/extended/deserialize/parse_tests.rs
new file mode 100644
index 0000000..f3b8258
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/deserialize/parse_tests.rs
@@ -0,0 +1,724 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use super::*;
+use crate::extended::deserialize::encrypted_section::{
+    MicEncryptedSection, SignatureEncryptedSection,
+};
+use std::vec;
+
+#[test]
+fn parse_adv_ext_no_identity() {
+    // 2 sections, 2 DEs each
+    let mut adv_body = vec![];
+    // section
+    adv_body.push(9);
+    // de 1 byte header, type 5, len 5
+    adv_body.extend_from_slice(&[0x55, 0x01, 0x02, 0x03, 0x04, 0x05]);
+    // de 2 byte header, type 6, len 1
+    adv_body.extend_from_slice(&[0x81, 0x06, 0x01]);
+
+    // section
+    adv_body.push(11);
+    // de 3 byte header, len 4
+    adv_body.extend_from_slice(&[0x84, 0xC3, 0x03, 0x01, 0x02, 0x03, 0x04]);
+    // de 1 byte header, type 8, len 3
+    adv_body.extend_from_slice(&[0x38, 0x01, 0x02, 0x03]);
+
+    assert_eq!(
+        Ok(vec![
+            PlaintextSection::new(
+                PlaintextIdentityMode::None,
+                SectionContents::new(
+                    9,
+                    &[
+                        // 1 byte header, len 5
+                        RefDataElement {
+                            offset: 0_usize.into(),
+                            header_len: 1,
+                            de_type: 5_u8.into(),
+                            contents: &[0x01, 0x02, 0x03, 0x04, 0x05]
+                        },
+                        // 2 byte header, len 1
+                        RefDataElement {
+                            offset: 1_usize.into(),
+                            header_len: 2,
+                            de_type: 6_u8.into(),
+                            contents: &[0x01]
+                        }
+                    ]
+                )
+            )
+            .into(),
+            PlaintextSection::new(
+                PlaintextIdentityMode::None,
+                SectionContents::new(
+                    11,
+                    &[
+                        // 3 byte header, len 4
+                        RefDataElement {
+                            offset: 0_usize.into(),
+                            header_len: 3,
+                            de_type: 0b0000_0000_0000_0000_0010_0001_1000_0011_u32.into(),
+                            contents: &[0x01, 0x02, 0x03, 0x04]
+                        },
+                        // 1 byte header, len 3
+                        RefDataElement {
+                            offset: 1_usize.into(),
+                            header_len: 1,
+                            de_type: 8_u8.into(),
+                            contents: &[0x01, 0x02, 0x03]
+                        }
+                    ]
+                )
+            )
+            .into()
+        ]),
+        parse_sections(&V1Header { header_byte: 0x20 }, &adv_body)
+    );
+}
+
+#[test]
+fn parse_adv_ext_public_identity() {
+    // 2 sections, 3 DEs each
+    let mut adv_body = vec![];
+    // section
+    adv_body.push(10);
+    // public identity
+    adv_body.push(0x03);
+    // de 1 byte header, type 5, len 5
+    adv_body.extend_from_slice(&[0x55, 0x01, 0x02, 0x03, 0x04, 0x05]);
+    // de 2 byte header, type 6, len 1
+    adv_body.extend_from_slice(&[0x81, 0x06, 0x01]);
+
+    // section
+    adv_body.push(12);
+    // public identity
+    adv_body.push(0x03);
+    // de 3 byte header, len 4
+    adv_body.extend_from_slice(&[0x84, 0xC3, 0x03, 0x01, 0x02, 0x03, 0x04]);
+    // de 1 byte header, type 8, len 3
+    adv_body.extend_from_slice(&[0x38, 0x01, 0x02, 0x03]);
+
+    assert_eq!(
+        Ok(vec![
+            PlaintextSection::new(
+                PlaintextIdentityMode::Public,
+                SectionContents::new(
+                    10,
+                    &[
+                        // 1 byte header, len 5
+                        RefDataElement {
+                            offset: 1_usize.into(),
+                            header_len: 1,
+                            de_type: 5_u8.into(),
+                            contents: &[0x01, 0x02, 0x03, 0x04, 0x05],
+                        },
+                        // 2 byte header, len 1
+                        RefDataElement {
+                            offset: 2_usize.into(),
+                            header_len: 2,
+                            de_type: 6_u8.into(),
+                            contents: &[0x01],
+                        },
+                    ],
+                )
+            )
+            .into(),
+            PlaintextSection::new(
+                PlaintextIdentityMode::Public,
+                SectionContents::new(
+                    12,
+                    &[
+                        // 3 byte header, len 4
+                        RefDataElement {
+                            offset: 1_usize.into(),
+                            header_len: 3,
+                            de_type: 0b0000_0000_0000_0000_0010_0001_1000_0011_u32.into(),
+                            contents: &[0x01, 0x02, 0x03, 0x04],
+                        },
+                        // 1 byte header, len 3
+                        RefDataElement {
+                            offset: 2_usize.into(),
+                            header_len: 1,
+                            de_type: 8_u8.into(),
+                            contents: &[0x01, 0x02, 0x03],
+                        },
+                    ],
+                )
+            )
+            .into(),
+        ]),
+        parse_sections(&V1Header { header_byte: 0x20 }, &adv_body)
+    );
+}
+
+#[test]
+fn parse_adv_ext_identity() {
+    // 3 sections
+    let mut adv_body = vec![];
+    // section - 48 bytes total
+    adv_body.push(19 + 18 + 10);
+    // encryption info -- 2 + 1 + 16x 0x11
+    adv_body.extend_from_slice(&[
+        0x91, 0x10, // header
+        0x08, // scheme (signature)
+        0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+        0x11, // salt
+    ]);
+    // private identity -- 2 + 16x 0x33
+    adv_body.extend_from_slice(&[
+        0x90, 0x01, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
+        0x33, 0x33, 0x33,
+    ]);
+    // 10 bytes of 0xFF ciphertext
+    adv_body.extend_from_slice(&[0xFF; 10]);
+
+    // section - 49 bytes total
+    adv_body.push(19 + 18 + 11);
+    // encryption info -- 2 + 1 + 16x 0x11
+    adv_body.extend_from_slice(&[
+        0x91, 0x10, // header
+        0x08, // scheme (signature)
+        0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+        0x11, // salt
+    ]);
+    // trusted identity -- 2 + 16x 0x55
+    adv_body.extend_from_slice(&[
+        0x90, 0x02, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55,
+        0x55, 0x55, 0x55,
+    ]);
+    // 11 bytes of 0xFF ciphertext
+    adv_body.extend_from_slice(&[0xFF; 11]);
+
+    // section - 50 bytes total
+    adv_body.push(19 + 18 + 12);
+    // encryption info -- 2 + 1 + 16x 0x11
+    adv_body.extend_from_slice(&[
+        0x91, 0x10, // header
+        0x08, // scheme (signature)
+        0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+        0x11, // salt
+    ]);
+    // provisioned identity -- 2 + 16x 0x77
+    adv_body.extend_from_slice(&[
+        0x90, 0x04, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77,
+        0x77, 0x77, 0x77,
+    ]);
+    // 12 bytes of 0xFF ciphertext
+    adv_body.extend_from_slice(&[0xFF; 12]);
+
+    let adv_header = V1Header { header_byte: 0x20 };
+    let encryption_info = EncryptionInfo {
+        bytes: [
+            0x91, 0x10, // header bytes
+            0x08, // scheme (signature)
+            0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+            0x11, 0x11,
+        ],
+    };
+    assert_eq!(
+        Ok(vec![
+            SignatureEncryptedSection {
+                section_header: 47,
+                adv_header: &adv_header,
+                encryption_info: encryption_info.clone(),
+                identity: EncryptedIdentityMetadata {
+                    header_bytes: [0x90, 0x01],
+                    offset: 1_usize.into(),
+                    identity_type: EncryptedIdentityDataElementType::Private,
+                },
+                // skip section header + encryption info + identity header -> end of section
+                all_ciphertext: &adv_body[1 + 19 + 2..48],
+            }
+            .into(),
+            SignatureEncryptedSection {
+                section_header: 48,
+                adv_header: &adv_header,
+                encryption_info: encryption_info.clone(),
+                identity: EncryptedIdentityMetadata {
+                    header_bytes: [0x90, 0x02],
+                    offset: 1_usize.into(),
+                    identity_type: EncryptedIdentityDataElementType::Trusted,
+                },
+                all_ciphertext: &adv_body[48 + 1 + 19 + 2..97],
+            }
+            .into(),
+            SignatureEncryptedSection {
+                section_header: 49,
+                adv_header: &adv_header,
+                encryption_info,
+                identity: EncryptedIdentityMetadata {
+                    header_bytes: [0x90, 0x04],
+                    offset: 1_usize.into(),
+                    identity_type: EncryptedIdentityDataElementType::Provisioned,
+                },
+                all_ciphertext: &adv_body[97 + 1 + 19 + 2..],
+            }
+            .into()
+        ]),
+        parse_sections(&adv_header, &adv_body)
+    );
+}
+
+#[test]
+fn parse_adv_ext_mic_identity() {
+    // 3 sections
+    let mut adv_body = vec![];
+    // section - 64 bytes total
+    adv_body.push(19 + 18 + 10 + 16);
+    // encryption info -- 2 + 1 + 16x 0x11
+    adv_body.extend_from_slice(&[
+        0x91, 0x10, // header
+        0x00, // scheme (mic)
+        0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+        0x11, // salt
+    ]);
+    // private identity -- 2 + 16x 0x55
+    adv_body.extend_from_slice(&[
+        0x90, 0x01, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55,
+        0x55, 0x55, 0x55,
+    ]);
+    // 10 bytes of 0xFF ciphertext
+    adv_body.extend_from_slice(&[0xFF; 10]);
+    // mic - 16x 0x33
+    adv_body.extend_from_slice(&[
+        0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
+        0x33,
+    ]);
+
+    // section - 65 bytes total
+    adv_body.push(19 + 18 + 11 + 16);
+    // encryption info -- 2 + 1 + 16x 0x11
+    adv_body.extend_from_slice(&[
+        0x91, 0x10, // header
+        0x00, // scheme (mic)
+        0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+        0x11, // salt
+    ]);
+    // trusted identity -- 2 + 16x 0x77
+    adv_body.extend_from_slice(&[
+        0x90, 0x02, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77,
+        0x77, 0x77, 0x77,
+    ]);
+    // 11 bytes of 0xFF ciphertext
+    adv_body.extend_from_slice(&[0xFF; 11]);
+    // mic - 16x 0x66
+    adv_body.extend_from_slice(&[
+        0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+        0x66,
+    ]);
+
+    // section - 66 bytes total
+    adv_body.push(19 + 18 + 12 + 16);
+    // encryption info -- 2 + 1 + 16x 0x11
+    adv_body.extend_from_slice(&[
+        0x91, 0x10, // header
+        0x00, // scheme (mic)
+        0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+        0x11, // salt
+    ]);
+    // provisioned identity -- 2 + 16x 0xAA
+    adv_body.extend_from_slice(&[
+        0x90, 0x04, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
+        0xAA, 0xAA, 0xAA,
+    ]);
+    // 12 bytes of 0xFF ciphertext
+    adv_body.extend_from_slice(&[0xFF; 12]);
+    // mic - 16x 0x99
+    adv_body.extend_from_slice(&[
+        0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
+        0x99,
+    ]);
+
+    let adv_header = V1Header { header_byte: 0x20 };
+    let encryption_info = EncryptionInfo {
+        bytes: [
+            0x91, 0x10, // header bytes
+            0x00, // scheme (mic)
+            0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+            0x11, 0x11,
+        ],
+    };
+    assert_eq!(
+        Ok(vec![
+            MicEncryptedSection {
+                section_header: 63,
+                adv_header: &adv_header,
+                mic: SectionMic::from([0x33; 16]),
+                encryption_info: encryption_info.clone(),
+                identity: EncryptedIdentityMetadata {
+                    header_bytes: [0x90, 0x01],
+                    offset: 1_usize.into(),
+                    identity_type: EncryptedIdentityDataElementType::Private,
+                },
+                // skip section header +  encryption info + identity header -> end of ciphertext
+                all_ciphertext: &adv_body[1 + 19 + 2..64 - 16],
+            }
+            .into(),
+            MicEncryptedSection {
+                section_header: 64,
+                adv_header: &adv_header,
+                mic: SectionMic::from([0x66; 16]),
+                encryption_info: encryption_info.clone(),
+                identity: EncryptedIdentityMetadata {
+                    header_bytes: [0x90, 0x02],
+                    offset: 1_usize.into(),
+                    identity_type: EncryptedIdentityDataElementType::Trusted,
+                },
+                all_ciphertext: &adv_body[64 + 1 + 19 + 2..129 - 16],
+            }
+            .into(),
+            MicEncryptedSection {
+                section_header: 65,
+                adv_header: &adv_header,
+                mic: SectionMic::from([0x99; 16]),
+                encryption_info,
+                identity: EncryptedIdentityMetadata {
+                    header_bytes: [0x90, 0x04],
+                    offset: 1_usize.into(),
+                    identity_type: EncryptedIdentityDataElementType::Provisioned,
+                },
+                all_ciphertext: &adv_body[129 + 1 + 19 + 2..195 - 16],
+            }
+            .into(),
+        ]),
+        parse_sections(&adv_header, &adv_body)
+    );
+}
+
+#[test]
+fn public_identity_not_first_de_error() {
+    let mut adv_body = vec![];
+
+    // section
+    adv_body.push(3 + 1);
+    // misc other DE
+    adv_body.extend_from_slice(&[0x81, 0x70, 0xFF]);
+    // public identity after another DE
+    adv_body.push(0x03);
+
+    assert_eq!(
+        Err(nom::Err::Error(error::Error {
+            input: &adv_body[4..],
+            // Eof because all_consuming is used to ensure complete section is parsed
+            code: error::ErrorKind::Eof
+        })),
+        parse_sections(&V1Header { header_byte: 0x20 }, &adv_body)
+    );
+}
+
+#[test]
+fn public_identity_after_public_identity_error() {
+    let mut adv_body = vec![];
+
+    // section
+    adv_body.push(1 + 3 + 1);
+    // public identity after another DE
+    adv_body.push(0x03);
+    // misc other DE
+    adv_body.extend_from_slice(&[0x81, 0x70, 0xFF]);
+    // public identity after another DE
+    adv_body.push(0x03);
+
+    assert_eq!(
+        Err(nom::Err::Error(error::Error {
+            // since we use many1, the parser consumes the first byte and returns the remaining in the error
+            input: &adv_body[1..],
+            // Eof because all_consuming is used to ensure complete section is parsed
+            code: error::ErrorKind::Eof
+        })),
+        parse_sections(&V1Header { header_byte: 0x20 }, &adv_body)
+    );
+}
+
+#[test]
+fn salt_public_identity_error() {
+    let mut adv_body = vec![];
+    // section
+    adv_body.push(3 + 1 + 3);
+    // salt - 1 + 2x 0x22 (invalid: must be first DE)
+    adv_body.extend_from_slice(&[0x20, 0x22, 0x22]);
+    // public identity
+    adv_body.push(0x03);
+    // misc other DE
+    adv_body.extend_from_slice(&[0x81, 0x70, 0xFF]);
+
+    assert_eq!(
+        Err(nom::Err::Error(error::Error {
+            input: &adv_body[4..],
+            // Eof because all_consuming is used to ensure complete section is parsed
+            code: error::ErrorKind::Eof
+        })),
+        parse_sections(&V1Header { header_byte: 0x20 }, &adv_body)
+    );
+}
+
+#[test]
+fn salt_mic_public_identity_error() {
+    let mut adv_body = vec![];
+    // section
+    adv_body.push(3 + 18 + 1 + 3);
+    // salt - 1 + 2x 0x22 (invalid: must be first DE)
+    adv_body.extend_from_slice(&[0x20, 0x22, 0x22]);
+    // mic - 2 + 16x 0x33
+    adv_body.extend_from_slice(&[
+        0x90, 0x13, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
+        0x33, 0x33, 0x33,
+    ]);
+    // public identity
+    adv_body.push(0x03);
+    // misc other DE
+    adv_body.extend_from_slice(&[0x81, 0x70, 0xFF]);
+
+    assert_eq!(
+        Err(nom::Err::Error(error::Error {
+            input: &adv_body[22..],
+            // Eof because all_consuming is used to ensure complete section is parsed
+            code: error::ErrorKind::Eof
+        })),
+        parse_sections(&V1Header { header_byte: 0x20 }, &adv_body)
+    );
+}
+
+#[test]
+fn parse_de_with_1_byte_header() {
+    let data = [0x51, 0x01, 0x02, 0x03, 0x04, 0x05, 0xFF, 0xFF];
+    assert_eq!(
+        Ok((
+            &data[6..],
+            ProtoDataElement {
+                header: DeHeader {
+                    de_type: 1_u8.into(),
+                    header_bytes: ArrayView::try_from_slice(&[0x51]).unwrap(),
+                    contents_len: 5_u8.try_into().unwrap()
+                },
+                contents: &data[1..6]
+            }
+        )),
+        ProtoDataElement::parse(&data)
+    );
+}
+
+#[test]
+fn parse_de_with_2_byte_header() {
+    let data = [0x85, 0x01, 0x01, 0x02, 0x03, 0x04, 0x05, 0xFF, 0xFF];
+    assert_eq!(
+        Ok((
+            &data[7..],
+            ProtoDataElement {
+                header: DeHeader {
+                    de_type: 1_u8.into(),
+                    header_bytes: ArrayView::try_from_slice(&[0x85, 0x01]).unwrap(),
+                    contents_len: 5_u8.try_into().unwrap()
+                },
+                contents: &data[2..7]
+            }
+        )),
+        ProtoDataElement::parse(&data)
+    );
+}
+
+#[test]
+fn parse_de_with_3_byte_header() {
+    let data = [0x85, 0xC1, 0x41, 0x01, 0x02, 0x03, 0x04, 0x05, 0xFF, 0xFF];
+    assert_eq!(
+        Ok((
+            &data[8..],
+            ProtoDataElement {
+                header: DeHeader {
+                    header_bytes: ArrayView::try_from_slice(&[0x85, 0xC1, 0x41]).unwrap(),
+                    contents_len: 5_u8.try_into().unwrap(),
+                    de_type: 0b0000_0000_0000_0000_0010_0000_1100_0001_u32.into(),
+                },
+                contents: &data[3..8]
+            }
+        )),
+        ProtoDataElement::parse(&data)
+    );
+}
+
+#[test]
+fn parse_de_header_1_byte() {
+    let data = [0x51, 0xFF, 0xFF];
+    assert_eq!(
+        Ok((
+            &data[1..],
+            DeHeader {
+                de_type: 1_u8.into(),
+                contents_len: 5_u8.try_into().unwrap(),
+                header_bytes: ArrayView::try_from_slice(&[0x51]).unwrap(),
+            }
+        )),
+        DeHeader::parse(&data)
+    );
+}
+
+#[test]
+fn parse_de_header_2_bytes() {
+    let data = [0x83, 0x01, 0xFF, 0xFF];
+    assert_eq!(
+        Ok((
+            &data[2..],
+            DeHeader {
+                de_type: 1_u8.into(),
+                contents_len: 3_u8.try_into().unwrap(),
+                header_bytes: ArrayView::try_from_slice(&[0x83, 0x01]).unwrap(),
+            }
+        )),
+        DeHeader::parse(&data)
+    );
+}
+
+#[test]
+fn parse_de_header_3_bytes() {
+    let data = [0x83, 0xC1, 0x41, 0xFF, 0xFF];
+    assert_eq!(
+        Ok((
+            &data[3..],
+            DeHeader {
+                de_type: 0b0000_0000_0000_0000_0010_0000_1100_0001_u32.into(),
+                contents_len: 3_u8.try_into().unwrap(),
+                header_bytes: ArrayView::try_from_slice(&[0x83, 0xC1, 0x41]).unwrap(),
+            }
+        )),
+        DeHeader::parse(&data)
+    );
+}
+
+#[test]
+fn parse_de_header_4_bytes() {
+    let data = [0x83, 0xC1, 0xC1, 0x41, 0xFF, 0xFF];
+    assert_eq!(
+        Ok((
+            &data[4..],
+            DeHeader {
+                de_type: 0b0000_0000_0001_0000_0110_0000_1100_0001_u32.into(),
+                contents_len: 3_u8.try_into().unwrap(),
+                header_bytes: ArrayView::try_from_slice(&[0x83, 0xC1, 0xC1, 0x41]).unwrap(),
+            }
+        )),
+        DeHeader::parse(&data)
+    );
+}
+
+#[test]
+fn parse_section_length_overrun() {
+    // section of length 0xF0 - legal but way longer than 3
+    let input = [0xF0, 0x01, 0x02, 0x03];
+    assert_eq!(
+        nom::Err::Error(error::Error {
+            // attempted to read section contents
+            input: &input.as_slice()[1..],
+            code: error::ErrorKind::Eof
+        }),
+        IntermediateSection::parser_with_header(&V1Header { header_byte: 0x20 })(&input)
+            .unwrap_err()
+    );
+}
+
+#[test]
+fn parse_de_single_byte_header_length_overrun() {
+    // length 7, type 0x03
+    let input = [0b0111_0011, 0x01, 0x02];
+    assert_eq!(
+        nom::Err::Error(error::Error {
+            // attempted to read DE contents
+            input: &input.as_slice()[1..],
+            code: error::ErrorKind::Eof
+        }),
+        ProtoDataElement::parse(&input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_de_multi_byte_header_length_overrun() {
+    // length 7, type 0x0F
+    let input = [0b1000_0111, 0x0F, 0x01, 0x02];
+    assert_eq!(
+        nom::Err::Error(error::Error {
+            // attempted to read DE contents
+            input: &input.as_slice()[2..],
+            code: error::ErrorKind::Eof
+        }),
+        ProtoDataElement::parse(&input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_de_header_non_canonical_multi_byte() {
+    // length 1, type 1
+    // first byte of type doesn't have any bits in it so it contributes nothing
+    let input = [0b1000_0001, 0b1000_0000, 0b0000_0001];
+    assert_eq!(
+        nom::Err::Error(error::Error {
+            // attempted to read first type byte
+            input: &input.as_slice()[1..],
+            code: error::ErrorKind::Verify
+        }),
+        DeHeader::parse(&input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_section_length_zero() {
+    // Section length of 0 - should return a verification error
+    let input = [0x00];
+    assert_eq!(
+        nom::Err::Error(error::Error {
+            // attempted to read section contents
+            input: input.as_slice(),
+            code: error::ErrorKind::Verify
+        }),
+        IntermediateSection::parser_with_header(&V1Header { header_byte: 0x20 })(&input)
+            .unwrap_err()
+    );
+}
+
+#[test]
+fn parse_empty_section() {
+    // empty section - should return an EOF error
+    let input = [];
+    assert_eq!(
+        nom::Err::Error(error::Error {
+            // attempted to read section contents
+            input: input.as_slice(),
+            code: error::ErrorKind::Eof
+        }),
+        IntermediateSection::parser_with_header(&V1Header { header_byte: 0x20 })(&input)
+            .unwrap_err()
+    );
+}
+
+// for convenient .into() in expected test data
+
+impl<'a> From<SignatureEncryptedSection<'a>> for IntermediateSection<'a> {
+    fn from(s: SignatureEncryptedSection<'a>) -> Self {
+        IntermediateSection::Ciphertext(CiphertextSection::SignatureEncryptedIdentity(s))
+    }
+}
+
+impl<'a> From<MicEncryptedSection<'a>> for IntermediateSection<'a> {
+    fn from(s: MicEncryptedSection<'a>) -> Self {
+        IntermediateSection::Ciphertext(CiphertextSection::MicEncryptedIdentity(s))
+    }
+}
+
+impl<'a> From<PlaintextSection> for IntermediateSection<'a> {
+    fn from(s: PlaintextSection) -> Self {
+        IntermediateSection::Plaintext(s)
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/deserialize/section_tests.rs b/nearby/presence/np_adv/src/extended/deserialize/section_tests.rs
new file mode 100644
index 0000000..7199031
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/deserialize/section_tests.rs
@@ -0,0 +1,672 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use super::*;
+use crate::{
+    credential::{
+        simple::SimpleV1Credential,
+        source::{CredentialSource, SliceCredentialSource},
+        MatchableCredential, V1Credential,
+    },
+    extended::{
+        data_elements::GenericDataElement,
+        deserialize::{
+            convert_data_elements,
+            test_stubs::{HkdfCryptoMaterial, IntermediateSectionExt},
+            OffsetDataElement,
+        },
+        serialize::{
+            self, AdvBuilder, MicEncrypted, SectionBuilder, SignedEncrypted, WriteDataElement,
+        },
+        MAX_DE_LEN,
+    },
+    parse_adv_header, AdvHeader, PublicIdentity,
+};
+use crypto_provider::{CryptoProvider, CryptoRng};
+use crypto_provider_default::CryptoProviderImpl;
+use rand::{seq::SliceRandom as _, Rng as _, SeedableRng as _};
+use std::prelude::rust_2021::*;
+use std::vec;
+
+type KeyPair = np_ed25519::KeyPair<CryptoProviderImpl>;
+
+#[test]
+fn deserialize_public_identity_section() {
+    do_deserialize_section_unencrypted::<PublicIdentity>(
+        PublicIdentity::default(),
+        PlaintextIdentityMode::Public,
+        1,
+        1,
+    );
+}
+
+// due to lifetime issues, this is somewhat challenging to share with the 90% identical signature
+// test, but if someone feels like putting in the tinkering to make it happen, please do
+#[test]
+fn deserialize_mic_encrypted_rand_identities_finds_correct_one() {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+    for _ in 0..100 {
+        let identities = (0..100).map(|_| (rng.gen(), KeyPair::generate())).collect::<Vec<_>>();
+
+        let chosen_index = rng.gen_range(0..identities.len());
+        let (chosen_key_seed, _chosen_key_pair) = &identities[chosen_index];
+
+        // share a metadata key to emphasize that we're _only_ using the identity to
+        // differentiate
+        let metadata_key: [u8; 16] = rng.gen();
+
+        let creds = identities
+            .iter()
+            .enumerate()
+            .map(|(index, (key_seed, key_pair))| {
+                SimpleV1Credential::new(
+                    HkdfCryptoMaterial::new(key_seed, &metadata_key, key_pair.public()),
+                    index,
+                )
+            })
+            .collect::<Vec<_>>();
+        let cred_source = SliceCredentialSource::new(&creds);
+
+        let identity_type =
+            *EncryptedIdentityDataElementType::iter().collect::<Vec<_>>().choose(&mut rng).unwrap();
+
+        let mut adv_builder = AdvBuilder::new();
+
+        let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(chosen_key_seed);
+        let mut section_builder = adv_builder
+            .section_builder(MicEncrypted::new_random_salt(
+                &mut crypto_rng,
+                identity_type,
+                &metadata_key,
+                &hkdf,
+            ))
+            .unwrap();
+
+        let (expected_de_data, expected_des, orig_des) =
+            fill_section_random_des(&mut rng, &mut section_builder, 2);
+
+        section_builder.add_to_advertisement();
+
+        let adv = adv_builder.into_advertisement();
+
+        let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+
+        let v1_header = if let AdvHeader::V1(h) = header {
+            h
+        } else {
+            panic!("incorrect header");
+        };
+
+        let sections = parse_sections(&v1_header, remaining).unwrap();
+        assert_eq!(1, sections.len());
+        let (section, cred) = try_deserialize_all_creds::<_, _, CryptoProviderImpl>(
+            sections[0].as_ciphertext().unwrap(),
+            &cred_source,
+        )
+        .unwrap()
+        .unwrap();
+
+        assert_eq!(&chosen_index, cred.matched_data());
+
+        assert_eq!(section.identity_type(), identity_type);
+        assert_eq!(section.verification_mode(), VerificationMode::Mic);
+        assert_eq!(section.metadata_key(), &metadata_key);
+        assert_eq!(
+            section.contents,
+            SectionContents {
+                section_header: (19 + 2 + 16 + total_de_len(&orig_des) + 16) as u8,
+                de_data: ArrayView::try_from_slice(expected_de_data.as_slice()).unwrap(),
+                data_elements: expected_des,
+            }
+        );
+        assert_eq!(
+            section
+                .data_elements()
+                .map(|de| GenericDataElement::try_from(de.de_type(), de.contents()).unwrap())
+                .collect::<Vec<_>>(),
+            orig_des
+        );
+    }
+}
+
+#[test]
+fn deserialize_signature_encrypted_rand_identities_finds_correct_one() {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+    for _ in 0..100 {
+        let identities = (0..100).map(|_| (rng.gen(), KeyPair::generate())).collect::<Vec<_>>();
+
+        let chosen_index = rng.gen_range(0..identities.len());
+        let (chosen_key_seed, chosen_key_pair) = &identities[chosen_index];
+
+        // share a metadata key to emphasize that we're _only_ using the identity to
+        // differentiate
+        let metadata_key: [u8; 16] = rng.gen();
+
+        let creds = identities
+            .iter()
+            .enumerate()
+            .map(|(index, (key_seed, key_pair))| {
+                let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(key_seed);
+                let unsigned =
+                    hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key);
+                let signed =
+                    hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key);
+                SimpleV1Credential::new(
+                    HkdfCryptoMaterial {
+                        hkdf: *key_seed,
+                        expected_unsigned_metadata_key_hmac: unsigned,
+                        expected_signed_metadata_key_hmac: signed,
+                        pub_key: key_pair.public().to_bytes(),
+                    },
+                    index,
+                )
+            })
+            .collect::<Vec<_>>();
+        let cred_source = SliceCredentialSource::new(&creds);
+
+        let identity_type =
+            *EncryptedIdentityDataElementType::iter().collect::<Vec<_>>().choose(&mut rng).unwrap();
+
+        let mut adv_builder = AdvBuilder::new();
+
+        let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(chosen_key_seed);
+        let mut section_builder = adv_builder
+            .section_builder(SignedEncrypted::new_random_salt(
+                &mut crypto_rng,
+                identity_type,
+                &metadata_key,
+                chosen_key_pair,
+                &hkdf,
+            ))
+            .unwrap();
+
+        let (expected_de_data, expected_des, orig_des) =
+            fill_section_random_des(&mut rng, &mut section_builder, 2);
+
+        section_builder.add_to_advertisement();
+
+        let adv = adv_builder.into_advertisement();
+
+        let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+
+        let v1_header = if let AdvHeader::V1(h) = header {
+            h
+        } else {
+            panic!("incorrect header");
+        };
+
+        let sections = parse_sections(&v1_header, remaining).unwrap();
+        assert_eq!(1, sections.len());
+        let (section, cred) = try_deserialize_all_creds::<_, _, CryptoProviderImpl>(
+            sections[0].as_ciphertext().unwrap(),
+            &cred_source,
+        )
+        .unwrap()
+        .unwrap();
+
+        assert_eq!(&chosen_index, cred.matched_data());
+
+        assert_eq!(section.identity_type(), identity_type);
+        assert_eq!(section.verification_mode(), VerificationMode::Signature);
+        assert_eq!(section.metadata_key(), &metadata_key);
+        assert_eq!(
+            section.contents,
+            SectionContents {
+                section_header: (19 + 2 + 16 + 64 + total_de_len(&orig_des)) as u8,
+                de_data: ArrayView::try_from_slice(expected_de_data.as_slice()).unwrap(),
+                data_elements: expected_des,
+            }
+        );
+        assert_eq!(
+            section
+                .data_elements()
+                .map(|de| GenericDataElement::try_from(de.de_type(), de.contents()).unwrap())
+                .collect::<Vec<_>>(),
+            orig_des
+        );
+    }
+}
+
+#[test]
+fn deserialize_encrypted_no_matching_identities_finds_nothing() {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+    for _ in 0..100 {
+        let signed = rng.gen();
+        let mut identities = (0..100).map(|_| (rng.gen(), KeyPair::generate())).collect::<Vec<_>>();
+
+        let chosen_index = rng.gen_range(0..identities.len());
+        // remove so they won't be found later
+        let (chosen_key_seed, chosen_key_pair) = identities.remove(chosen_index);
+
+        // share a metadata key to emphasize that we're _only_ using the identity to
+        // differentiate
+        let metadata_key: [u8; 16] = rng.gen();
+
+        let credentials = identities
+            .iter()
+            .enumerate()
+            .map(|(index, (key_seed, key_pair))| {
+                SimpleV1Credential::new(
+                    HkdfCryptoMaterial::new(key_seed, &metadata_key, key_pair.public()),
+                    index,
+                )
+            })
+            .collect::<Vec<_>>();
+        let cred_source = SliceCredentialSource::new(&credentials);
+
+        let identity_type =
+            *EncryptedIdentityDataElementType::iter().collect::<Vec<_>>().choose(&mut rng).unwrap();
+
+        let mut adv_builder = AdvBuilder::new();
+
+        let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&chosen_key_seed);
+
+        // awkward split because SectionIdentity isn't object-safe, so we can't just have a
+        // Box<dyn SectionIdentity> and use that in one code path
+        if signed {
+            let identity = SignedEncrypted::new_random_salt(
+                &mut crypto_rng,
+                identity_type,
+                &metadata_key,
+                &chosen_key_pair,
+                &hkdf,
+            );
+            let mut section_builder = adv_builder.section_builder(identity).unwrap();
+            let _ = fill_section_random_des(&mut rng, &mut section_builder, 2);
+            section_builder.add_to_advertisement();
+        } else {
+            let identity =
+                MicEncrypted::new_random_salt(&mut crypto_rng, identity_type, &metadata_key, &hkdf);
+            let mut section_builder = adv_builder.section_builder(identity).unwrap();
+            let _ = fill_section_random_des(&mut rng, &mut section_builder, 2);
+            section_builder.add_to_advertisement();
+        };
+
+        let adv = adv_builder.into_advertisement();
+        let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+        let v1_header = if let AdvHeader::V1(h) = header {
+            h
+        } else {
+            panic!("incorrect header");
+        };
+
+        let sections = parse_sections(&v1_header, remaining).unwrap();
+        assert_eq!(1, sections.len());
+
+        assert!(try_deserialize_all_creds::<_, _, CryptoProviderImpl>(
+            sections[0].as_ciphertext().unwrap(),
+            &cred_source
+        )
+        .unwrap()
+        .is_none());
+    }
+}
+
+#[test]
+fn convert_data_elements_empty() {
+    let orig_des = vec![];
+
+    let (des, data) = convert_data_elements(&orig_des);
+
+    assert_eq!(Vec::<OffsetDataElement>::new(), des);
+    assert_eq!(&Vec::<u8>::new(), data.as_slice());
+}
+
+#[test]
+fn convert_data_elements_just_fits() {
+    // this is actually longer than any real section's worth of DEs could be since we aren't putting
+    // DE headers in the array
+    let orig_data = vec![0x33; 1000];
+
+    let orig_des = vec![
+        RefDataElement {
+            offset: 2.into(),
+            header_len: 2,
+            de_type: 100_u32.into(),
+            contents: &orig_data[0..10],
+        },
+        RefDataElement {
+            offset: 3.into(),
+            header_len: 2,
+            de_type: 101_u32.into(),
+            contents: &orig_data[10..100],
+        },
+        RefDataElement {
+            offset: 4.into(),
+            header_len: 2,
+            de_type: 102_u32.into(),
+            contents: &orig_data[100..NP_ADV_MAX_SECTION_LEN],
+        },
+    ];
+
+    let (des, data) = convert_data_elements(&orig_des);
+
+    assert_eq!(
+        &[
+            OffsetDataElement {
+                offset: 2.into(),
+                de_type: 100_u32.into(),
+                start_of_contents: 0,
+                contents_len: 10
+            },
+            OffsetDataElement {
+                offset: 3.into(),
+                de_type: 101_u32.into(),
+                start_of_contents: 10,
+                contents_len: 90
+            },
+            OffsetDataElement {
+                offset: 4.into(),
+                de_type: 102_u32.into(),
+                start_of_contents: 100,
+                contents_len: NP_ADV_MAX_SECTION_LEN - 100,
+            },
+        ],
+        &des[..]
+    );
+    assert_eq!(&[0x33; NP_ADV_MAX_SECTION_LEN], data.as_slice());
+}
+
+#[test]
+#[should_panic]
+fn convert_data_elements_doesnt_fit_panic() {
+    let orig_data = vec![0x33; 1000];
+    let orig_des = vec![
+        RefDataElement {
+            offset: 2.into(),
+            header_len: 2,
+            de_type: 100_u32.into(),
+            contents: &orig_data[0..10],
+        },
+        // impossibly large DE
+        RefDataElement {
+            offset: 3.into(),
+            header_len: 2,
+            de_type: 101_u32.into(),
+            contents: &orig_data[10..500],
+        },
+    ];
+
+    let _ = convert_data_elements(&orig_des);
+}
+
+#[test]
+fn section_des_expose_correct_data() {
+    let mut orig_data = Vec::new();
+    orig_data.resize(130, 0);
+    for (index, byte) in orig_data.iter_mut().enumerate() {
+        *byte = index as u8;
+    }
+
+    let orig_des = vec![
+        OffsetDataElement {
+            offset: 2.into(),
+            de_type: 100_u32.into(),
+            start_of_contents: 0,
+            contents_len: 10,
+        },
+        OffsetDataElement {
+            offset: 3.into(),
+            de_type: 101_u32.into(),
+            start_of_contents: 10,
+            contents_len: 90,
+        },
+        OffsetDataElement {
+            offset: 4.into(),
+            de_type: 102_u32.into(),
+            start_of_contents: 100,
+            contents_len: 30,
+        },
+    ];
+
+    let section = SectionContents {
+        section_header: 99,
+        de_data: ArrayView::try_from_slice(&orig_data).unwrap(),
+        data_elements: orig_des,
+    };
+
+    // extract out the parts of the DE we care about
+    let des = section
+        .data_elements()
+        .map(|de| (de.offset(), de.de_type(), de.contents().to_vec()))
+        .collect::<Vec<_>>();
+    assert_eq!(
+        vec![
+            (2.into(), 100_u32.into(), orig_data[0..10].to_vec()),
+            (3.into(), 101_u32.into(), orig_data[10..100].to_vec()),
+            (4.into(), 102_u32.into(), orig_data[100..].to_vec())
+        ],
+        des
+    );
+}
+
+#[test]
+fn do_deserialize_zero_section_header() {
+    let mut adv: tinyvec::ArrayVec<[u8; 254]> = tinyvec::ArrayVec::new();
+    adv.push(0x20); // V1 Advertisement
+    adv.push(0x00); // Section header of 0
+    let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+    let v1_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+    parse_sections(&v1_header, remaining).expect_err("Expected an error");
+}
+
+#[test]
+fn do_deserialize_empty_section() {
+    let adv_builder = AdvBuilder::new();
+    let adv = adv_builder.into_advertisement();
+    let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+    let v1_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+    parse_sections(&v1_header, remaining).expect_err("Expected an error");
+}
+
+#[test]
+fn do_deserialize_max_number_of_sections() {
+    let adv_builder = build_dummy_advertisement_sections(NP_V1_ADV_MAX_SECTION_COUNT);
+    let adv = adv_builder.into_advertisement();
+    let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+
+    let v1_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+
+    let sections = parse_sections(&v1_header, remaining).unwrap();
+    assert_eq!(NP_V1_ADV_MAX_SECTION_COUNT, sections.len());
+}
+
+#[test]
+fn try_deserialize_over_max_number_of_sections() {
+    let adv_builder = build_dummy_advertisement_sections(NP_V1_ADV_MAX_SECTION_COUNT);
+    let mut adv = adv_builder.into_advertisement().as_slice().to_vec();
+
+    // Push an extra section
+    adv.extend_from_slice(
+        [
+            0x01, // Section header
+            0x03, // Public identity
+        ]
+        .as_slice(),
+    );
+
+    let (remaining, header) = parse_adv_header(&adv).unwrap();
+
+    let v1_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+    parse_sections(&v1_header, remaining)
+        .expect_err("Expected an error because number of sections is over 16");
+}
+
+pub(crate) fn random_de<R: rand::Rng>(rng: &mut R) -> GenericDataElement {
+    let mut array = [0_u8; MAX_DE_LEN];
+    rng.fill(&mut array[..]);
+    let data: ArrayView<u8, MAX_DE_LEN> =
+        ArrayView::try_from_array(array, rng.gen_range(0..=MAX_DE_LEN)).unwrap();
+    // skip the first few DEs that Google uses
+    GenericDataElement::try_from(rng.gen_range(20_u32..1000).into(), data.as_slice()).unwrap()
+}
+
+fn do_deserialize_section_unencrypted<I: serialize::SectionIdentity>(
+    identity: I,
+    expected_identity: PlaintextIdentityMode,
+    prefix_len: usize,
+    de_offset: usize,
+) {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(identity).unwrap();
+
+    let (expected_de_data, expected_des, orig_des) =
+        fill_section_random_des(&mut rng, &mut section_builder, de_offset);
+
+    section_builder.add_to_advertisement();
+
+    let adv = adv_builder.into_advertisement();
+
+    let (remaining, header) = parse_adv_header(adv.as_slice()).unwrap();
+
+    let v1_header = if let AdvHeader::V1(h) = header {
+        h
+    } else {
+        panic!("incorrect header");
+    };
+
+    let sections = parse_sections(&v1_header, remaining).unwrap();
+    assert_eq!(1, sections.len());
+    let section = sections[0].as_plaintext().unwrap();
+
+    assert_eq!(
+        &PlaintextSection {
+            identity: expected_identity,
+            contents: SectionContents {
+                section_header: (prefix_len + total_de_len(&orig_des)) as u8,
+                de_data: ArrayView::try_from_slice(expected_de_data.as_slice()).unwrap(),
+                data_elements: expected_des,
+            }
+        },
+        section
+    );
+    assert_eq!(
+        section
+            .contents
+            .data_elements()
+            .map(|de| GenericDataElement::try_from(de.de_type(), de.contents()).unwrap())
+            .collect::<Vec<_>>(),
+        orig_des
+    );
+}
+
+fn fill_section_random_des<R: rand::Rng, I: serialize::SectionIdentity>(
+    mut rng: &mut R,
+    section_builder: &mut SectionBuilder<I>,
+    de_offset: usize,
+) -> (Vec<u8>, Vec<OffsetDataElement>, Vec<GenericDataElement>) {
+    let mut expected_de_data = vec![];
+    let mut expected_des = vec![];
+    let mut orig_des = vec![];
+
+    for index in 0..rng.gen_range(1..10) {
+        let de = random_de(&mut rng);
+
+        let de_clone = de.clone();
+        if section_builder.add_de(|_| de_clone).is_err() {
+            break;
+        }
+
+        let orig_len = expected_de_data.len();
+        de.write_de_contents(&mut expected_de_data).unwrap();
+        let contents_len = expected_de_data.len() - orig_len;
+
+        expected_des.push(OffsetDataElement {
+            offset: (index as usize + de_offset).into(),
+            de_type: de.de_header().de_type,
+            contents_len,
+            start_of_contents: orig_len,
+        });
+        orig_des.push(de);
+    }
+    (expected_de_data, expected_des, orig_des)
+}
+
+fn total_de_len(des: &[GenericDataElement]) -> usize {
+    des.iter()
+        .map(|de| {
+            let mut buf = vec![];
+            de.write_de_contents(&mut buf);
+            de.de_header().serialize().len() + buf.len()
+        })
+        .sum()
+}
+
+type TryDeserOutput<'c, C> = Option<(DecryptedSection, <C as MatchableCredential>::Matched<'c>)>;
+
+/// Returns:
+/// - `Ok(Some)` if a matching credential was found
+/// - `Ok(None)` if no matching credential was found, or if `cred_source` provides no credentials
+/// - `Err` if an error occurred.
+fn try_deserialize_all_creds<'c, C, S, P>(
+    section: &CiphertextSection,
+    cred_source: &'c S,
+) -> Result<TryDeserOutput<'c, C>, BatchSectionDeserializeError>
+where
+    C: V1Credential,
+    S: CredentialSource<C>,
+    P: CryptoProvider,
+{
+    for c in cred_source.iter() {
+        match section.try_deserialize::<C, P>(c) {
+            Ok(s) => return Ok(Some((s, c.matched()))),
+            Err(e) => match e {
+                SectionDeserializeError::IncorrectCredential => continue,
+                SectionDeserializeError::ParseError => {
+                    return Err(BatchSectionDeserializeError::ParseError)
+                }
+            },
+        }
+    }
+
+    Ok(None)
+}
+
+fn build_dummy_advertisement_sections(number_of_sections: usize) -> AdvBuilder {
+    let mut adv_builder = AdvBuilder::new();
+    for _ in 0..number_of_sections {
+        let section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+        section_builder.add_to_advertisement();
+    }
+    adv_builder
+}
+
+#[derive(Debug, PartialEq, Eq)]
+enum BatchSectionDeserializeError {
+    /// Advertisement data is malformed
+    ParseError,
+}
diff --git a/nearby/presence/np_adv/src/extended/deserialize/test_stubs.rs b/nearby/presence/np_adv/src/extended/deserialize/test_stubs.rs
new file mode 100644
index 0000000..437b997
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/deserialize/test_stubs.rs
@@ -0,0 +1,115 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use crypto_provider::{ed25519, CryptoProvider};
+use np_hkdf::{NpKeySeedHkdf, UnsignedSectionKeys};
+use std::prelude::rust_2021::*;
+
+use crate::{
+    credential::v1::*,
+    extended::deserialize::{CiphertextSection, PlaintextSection},
+    IntermediateSection,
+};
+
+pub(crate) struct HkdfCryptoMaterial {
+    pub(crate) hkdf: [u8; 32],
+    pub(crate) expected_unsigned_metadata_key_hmac: [u8; 32],
+    pub(crate) expected_signed_metadata_key_hmac: [u8; 32],
+    pub(crate) pub_key: ed25519::RawPublicKey,
+}
+
+impl HkdfCryptoMaterial {
+    pub(crate) fn new<C: CryptoProvider>(
+        hkdf_key_seed: &[u8; 32],
+        metadata_key: &[u8; 16],
+        pub_key: np_ed25519::PublicKey<C>,
+    ) -> Self {
+        let hkdf = NpKeySeedHkdf::<C>::new(hkdf_key_seed);
+        let unsigned =
+            hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(metadata_key.as_slice());
+        let signed =
+            hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(metadata_key.as_slice());
+        Self {
+            hkdf: *hkdf_key_seed,
+            expected_unsigned_metadata_key_hmac: unsigned,
+            expected_signed_metadata_key_hmac: signed,
+            pub_key: pub_key.to_bytes(),
+        }
+    }
+}
+
+impl HkdfCryptoMaterial {
+    fn hkdf<C: CryptoProvider>(&self) -> NpKeySeedHkdf<C> {
+        NpKeySeedHkdf::<C>::new(&self.hkdf)
+    }
+}
+
+impl V1CryptoMaterial for HkdfCryptoMaterial {
+    type SignedIdentityResolverReference<'a> = SignedSectionIdentityResolutionMaterial
+        where Self: 'a;
+    type UnsignedIdentityResolverReference<'a> = UnsignedSectionIdentityResolutionMaterial
+        where Self: 'a;
+
+    fn signed_identity_resolution_material<C: CryptoProvider>(
+        &self,
+    ) -> Self::SignedIdentityResolverReference<'_> {
+        SignedSectionIdentityResolutionMaterial::from_hkdf_and_expected_metadata_key_hmac::<C>(
+            &self.hkdf::<C>(),
+            self.expected_signed_metadata_key_hmac,
+        )
+    }
+    fn unsigned_identity_resolution_material<C: CryptoProvider>(
+        &self,
+    ) -> Self::UnsignedIdentityResolverReference<'_> {
+        UnsignedSectionIdentityResolutionMaterial::from_hkdf_and_expected_metadata_key_hmac::<C>(
+            &self.hkdf::<C>(),
+            self.expected_unsigned_metadata_key_hmac,
+        )
+    }
+    fn signed_verification_material<C: CryptoProvider>(&self) -> SignedSectionVerificationMaterial {
+        SignedSectionVerificationMaterial { pub_key: self.pub_key }
+    }
+
+    fn unsigned_verification_material<C: CryptoProvider>(
+        &self,
+    ) -> UnsignedSectionVerificationMaterial {
+        let mic_hmac_key = *UnsignedSectionKeys::hmac_key(&self.hkdf::<C>()).as_bytes();
+        UnsignedSectionVerificationMaterial { mic_hmac_key }
+    }
+}
+
+pub(crate) trait IntermediateSectionExt {
+    /// Returns `Some` if `self` is `Plaintext`
+    fn as_plaintext(&self) -> Option<&PlaintextSection>;
+    /// Returns `Some` if `self` is `Ciphertext`
+    fn as_ciphertext(&self) -> Option<&CiphertextSection>;
+}
+
+impl<'a> IntermediateSectionExt for IntermediateSection<'a> {
+    fn as_plaintext(&self) -> Option<&PlaintextSection> {
+        match self {
+            IntermediateSection::Plaintext(s) => Some(s),
+            IntermediateSection::Ciphertext(_) => None,
+        }
+    }
+
+    fn as_ciphertext(&self) -> Option<&CiphertextSection> {
+        match self {
+            IntermediateSection::Plaintext(_) => None,
+            IntermediateSection::Ciphertext(s) => Some(s),
+        }
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/mod.rs b/nearby/presence/np_adv/src/extended/mod.rs
new file mode 100644
index 0000000..c2f485e
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/mod.rs
@@ -0,0 +1,90 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! V1 advertisement support.
+use crate::extended::de_type::DeType;
+use crate::DeLengthOutOfRange;
+use array_view::ArrayView;
+
+pub mod data_elements;
+pub mod de_type;
+pub mod deserialize;
+pub mod section_signature_payload;
+pub mod serialize;
+
+/// Maximum size of an NP advertisement, including the adv header
+pub const BLE_ADV_SVC_CONTENT_LEN: usize = 254
+    // length and type bytes for svc data TLV
+    - 1 - 1
+    // NP UUID
+    - 2;
+
+/// Maximum number of sections in an advertisement
+pub const NP_V1_ADV_MAX_SECTION_COUNT: usize = 8;
+
+/// Maximum size of a NP section, including its header byte
+pub const NP_ADV_MAX_SECTION_LEN: usize = BLE_ADV_SVC_CONTENT_LEN
+    // adv header byte
+    - 1;
+
+/// Max V1 DE length (7 bit length field).
+pub(crate) const MAX_DE_LEN: usize = 127;
+
+const METADATA_KEY_LEN: usize = 16;
+
+/// Length of a DE's content -- must be in `[0, 127]`
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub struct DeLength {
+    len: u8,
+}
+
+impl DeLength {
+    /// A convenient constant for zero length.
+    pub const ZERO: DeLength = DeLength { len: 0 };
+
+    fn as_usize(&self) -> usize {
+        self.len as usize
+    }
+}
+
+impl TryFrom<u8> for DeLength {
+    type Error = DeLengthOutOfRange;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        if value as usize <= MAX_DE_LEN {
+            Ok(Self { len: value })
+        } else {
+            Err(DeLengthOutOfRange {})
+        }
+    }
+}
+
+impl TryFrom<usize> for DeLength {
+    type Error = DeLengthOutOfRange;
+
+    fn try_from(value: usize) -> Result<Self, Self::Error> {
+        value.try_into().map_err(|_e| DeLengthOutOfRange).and_then(|num: u8| num.try_into())
+    }
+}
+
+/// Convert a tinyvec into an equivalent ArrayView
+fn to_array_view<T, const N: usize>(vec: tinyvec::ArrayVec<[T; N]>) -> ArrayView<T, N>
+where
+    [T; N]: tinyvec::Array,
+{
+    let len = vec.len();
+    ArrayView::try_from_array(vec.into_inner(), len).expect("len is from original vec")
+}
+
+pub(crate) const ENCRYPTION_INFO_DE_TYPE: DeType = DeType::const_from(0x10);
diff --git a/nearby/presence/np_adv/src/extended/section_signature_payload.rs b/nearby/presence/np_adv/src/extended/section_signature_payload.rs
new file mode 100644
index 0000000..2b0ebe5
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/section_signature_payload.rs
@@ -0,0 +1,142 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! V1 advertisement section np_ed25519 signature payload
+//! after the included context bytes, and utilities for
+//! performing signatures and signature verification.
+
+use crate::extended::deserialize::EncryptionInfo;
+use crate::NP_SVC_UUID;
+use crypto_provider::{aes::ctr::AesCtrNonce, CryptoProvider};
+use sink::{Sink, SinkWriter};
+
+/// A struct representing the necessary contents
+/// of an v1 advertisement section np_ed25519 signature payload which
+/// come after the context prefix (shared among all advs).
+pub(crate) struct SectionSignaturePayload<'a> {
+    /// Advertisement header byte
+    adv_header_byte: u8,
+    /// Header byte for the v1 section being signed
+    section_header: u8,
+    /// Reference to the complete contents of the [`EncryptionInfo`] DE.
+    encryption_info: &'a [u8; EncryptionInfo::TOTAL_DE_LEN],
+    /// Reference to the derived salt (IV) for the section
+    nonce_ref: &'a AesCtrNonce,
+    /// Reference to all remaining information after the derived salt, but
+    /// not including the signature itself [which gets tacked onto the end].
+    after_iv_info: AfterIVInfo<'a>,
+}
+
+/// Representation of the plaintext information in an advertisement
+/// signature payload which comes after the derived salt
+enum AfterIVInfo<'a> {
+    /// Reference to a raw byte array containing all information
+    /// to be included in the signature payload after the derived salt,
+    /// and before the signature itself.
+    Raw(&'a [u8]),
+    /// References to the plaintext identity DE header and the rest
+    /// of the section plaintext after that (includes the plaintext
+    /// identity DE payload).
+    IdentityHeaderThenRaw([u8; 2], &'a [u8]),
+}
+
+const ADV_SIGNATURE_CONTEXT: np_ed25519::SignatureContext = {
+    match np_ed25519::SignatureContext::from_string_bytes("Advertisement Signed Section") {
+        Ok(x) => x,
+        Err(_) => panic!(),
+    }
+};
+
+impl<'a> SectionSignaturePayload<'a> {
+    /// Construct a section signature payload using parts typically found during
+    /// serialization of advertisements.
+    pub(crate) fn from_serialized_parts(
+        adv_header_byte: u8,
+        section_header: u8,
+        encryption_info: &'a [u8; EncryptionInfo::TOTAL_DE_LEN],
+        nonce_ref: &'a AesCtrNonce,
+        raw_after_iv_info: &'a [u8],
+    ) -> Self {
+        Self {
+            adv_header_byte,
+            section_header,
+            encryption_info,
+            nonce_ref,
+            after_iv_info: AfterIVInfo::Raw(raw_after_iv_info),
+        }
+    }
+
+    /// Construct a section signature payload using parts typically found during
+    /// deserialization of advertisements.
+    pub(crate) fn from_deserialized_parts(
+        adv_header_byte: u8,
+        section_header: u8,
+        encryption_info: &'a [u8; EncryptionInfo::TOTAL_DE_LEN],
+        nonce_ref: &'a AesCtrNonce,
+        identity_header: [u8; 2],
+        raw_after_identity_header_info: &'a [u8],
+    ) -> Self {
+        Self {
+            adv_header_byte,
+            section_header,
+            encryption_info,
+            nonce_ref,
+            after_iv_info: AfterIVInfo::IdentityHeaderThenRaw(
+                identity_header,
+                raw_after_identity_header_info,
+            ),
+        }
+    }
+
+    /// Generates a signature for this section signing payload using
+    /// the given Ed25519 key-pair.
+    pub(crate) fn sign<C: CryptoProvider>(
+        self,
+        key_pair: &np_ed25519::KeyPair<C>,
+    ) -> np_ed25519::Signature<C> {
+        key_pair
+            .sign_with_context(&ADV_SIGNATURE_CONTEXT, self)
+            .expect("section signature payloads should fit in signature buffer")
+    }
+    /// Verifies a signature for this section signing payload using
+    /// the given Ed25519 public key.
+    pub(crate) fn verify<C: CryptoProvider>(
+        self,
+        signature: &np_ed25519::Signature<C>,
+        public_key: &np_ed25519::PublicKey<C>,
+    ) -> Result<(), np_ed25519::SignatureVerificationError> {
+        public_key.verify_signature_with_context(&ADV_SIGNATURE_CONTEXT, self, signature)
+    }
+}
+
+impl<'a> SinkWriter for SectionSignaturePayload<'a> {
+    type DataType = u8;
+
+    fn write_payload<S: Sink<u8> + ?Sized>(self, sink: &mut S) -> Option<()> {
+        sink.try_extend_from_slice(&NP_SVC_UUID)?;
+        sink.try_push(self.adv_header_byte)?;
+        sink.try_push(self.section_header)?;
+        sink.try_extend_from_slice(self.encryption_info)?;
+        sink.try_extend_from_slice(self.nonce_ref)?;
+
+        // identity DE and the rest of the DEs except for the suffix
+        match self.after_iv_info {
+            AfterIVInfo::Raw(s) => sink.try_extend_from_slice(s),
+            AfterIVInfo::IdentityHeaderThenRaw(identity_header, s) => {
+                sink.try_extend_from_slice(&identity_header)?;
+                sink.try_extend_from_slice(s)
+            }
+        }
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/serialize/adv_tests.rs b/nearby/presence/np_adv/src/extended/serialize/adv_tests.rs
new file mode 100644
index 0000000..47804ea
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/serialize/adv_tests.rs
@@ -0,0 +1,183 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+use super::*;
+use crate::extended::serialize::section_tests::{fill_section_builder, DummyDataElement};
+use np_hkdf::v1_salt::DataElementOffset;
+use std::{prelude::rust_2021::*, vec};
+
+#[test]
+fn adv_encode_no_salt() {
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut no_identity_section_builder =
+        adv_builder.section_builder(PublicIdentity::default()).unwrap();
+    no_identity_section_builder
+        .add_de(|_| DummyDataElement { de_type: 20_u32.into(), data: vec![] })
+        .unwrap();
+
+    no_identity_section_builder.add_to_advertisement();
+
+    let mut public_identity_section_builder =
+        adv_builder.section_builder(PublicIdentity::default()).unwrap();
+    public_identity_section_builder
+        .add_de(|_| DummyDataElement { de_type: 30_u32.into(), data: vec![] })
+        .unwrap();
+
+    public_identity_section_builder.add_to_advertisement();
+
+    assert_eq!(
+        &[
+            0x20, // adv header
+            0x3,  // section header
+            0x3,  // public identity
+            0x80, 20,  // de header
+            0x3, // section header
+            0x3, // public identity
+            0x80, 30, // de header
+        ],
+        adv_builder.into_advertisement().as_slice()
+    )
+}
+
+#[test]
+fn adv_encode_with_salt() {
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut no_identity_section_builder =
+        adv_builder.section_builder(PublicIdentity::default()).unwrap();
+    no_identity_section_builder
+        .add_de(|_| DummyDataElement { de_type: 20_u32.into(), data: vec![] })
+        .unwrap();
+
+    no_identity_section_builder.add_to_advertisement();
+
+    let mut public_identity_section_builder =
+        adv_builder.section_builder(PublicIdentity::default()).unwrap();
+    public_identity_section_builder
+        .add_de(|_| DummyDataElement { de_type: 30_u32.into(), data: vec![] })
+        .unwrap();
+
+    public_identity_section_builder.add_to_advertisement();
+
+    let mut expected = vec![
+        0x20, // adv header
+    ];
+    expected.extend_from_slice(&[
+        0x3, // section header
+        0x3, // public identity
+        0x80, 20,  // de header
+        0x3, // section header
+        0x3, // public identity
+        0x80, 30, // de header
+    ]);
+    assert_eq!(expected, adv_builder.into_advertisement().as_slice())
+}
+
+#[test]
+fn adding_any_allowed_section_length_always_works_for_single_section() {
+    // up to section len - 1 to leave room for section header
+    for section_contents_len in 0..NP_ADV_MAX_SECTION_LEN - 1 {
+        let mut adv_builder = AdvBuilder::new();
+        let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+        fill_section_builder(section_contents_len, &mut section_builder);
+
+        section_builder.add_to_advertisement();
+
+        let adv = adv_builder.into_advertisement();
+        assert_eq!(
+            section_contents_len + 1 + 1 + 1, // adv and section headers and identity
+            adv.as_slice().len(),
+            "adv: {:?}\nsection contents len: {}",
+            adv.as_slice(),
+            section_contents_len
+        );
+    }
+}
+
+#[test]
+fn adding_any_allowed_section_length_always_works_for_two_sections() {
+    // leave room for both section header bytes and the public identities
+    for section_1_contents_len in 0..=NP_ADV_MAX_SECTION_LEN - 4 {
+        // leave room for both section headers + public identities + section 1 contents
+        for section_2_contents_len in 0..=NP_ADV_MAX_SECTION_LEN - section_1_contents_len - 4 {
+            let mut adv_builder = AdvBuilder::new();
+
+            let mut section_1_builder =
+                adv_builder.section_builder(PublicIdentity::default()).unwrap();
+            fill_section_builder(section_1_contents_len, &mut section_1_builder);
+            section_1_builder.add_to_advertisement();
+
+            let mut section_2_builder =
+                adv_builder.section_builder(PublicIdentity::default()).unwrap();
+            fill_section_builder(section_2_contents_len, &mut section_2_builder);
+            section_2_builder.add_to_advertisement();
+
+            let adv = adv_builder.into_advertisement();
+            assert_eq!(
+                section_1_contents_len + section_2_contents_len + 1 + 4, // adv and section headers
+                adv.as_slice().len(),
+                "adv: {:?}\nsection 1 contents len: {}, section 2 contents len: {}",
+                adv.as_slice(),
+                section_1_contents_len,
+                section_2_contents_len,
+            );
+        }
+    }
+}
+
+#[test]
+fn building_capacity_0_section_works() {
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    // leave room for two section headers and the public identities
+    fill_section_builder(NP_ADV_MAX_SECTION_LEN - 4, &mut section_builder);
+    section_builder.add_to_advertisement();
+
+    let section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+    // The section header and the public identity
+    assert_eq!(2, section_builder.section.capacity);
+    assert_eq!(2, section_builder.section.len());
+    section_builder.add_to_advertisement();
+
+    assert_eq!(BLE_ADV_SVC_CONTENT_LEN, adv_builder.into_advertisement().as_slice().len());
+}
+
+/// A placeholder identity with a huge prefix
+#[derive(Default, PartialEq, Eq, Debug)]
+struct EnormousIdentity {}
+
+impl SectionIdentity for EnormousIdentity {
+    const PREFIX_LEN: usize = 200;
+    const SUFFIX_LEN: usize = 0;
+    const INITIAL_DE_OFFSET: DataElementOffset = DataElementOffset::ZERO;
+
+    fn postprocess(
+        &mut self,
+        _adv_header_byte: u8,
+        _section_header: u8,
+        _section_contents: &mut [u8],
+    ) {
+        panic!("should never be called, just used for its huge prefix")
+    }
+
+    type DerivedSalt = ();
+
+    fn de_salt(&self, _de_offset: DataElementOffset) -> Self::DerivedSalt {
+        panic!("should never be called, just used for its huge prefix")
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/serialize/de_header_tests.rs b/nearby/presence/np_adv/src/extended/serialize/de_header_tests.rs
new file mode 100644
index 0000000..eda8b69
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/serialize/de_header_tests.rs
@@ -0,0 +1,122 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use super::*;
+use crate::extended::deserialize;
+use core::cmp;
+use rand_ext::rand;
+use rand_ext::rand::{distributions, Rng as _};
+
+#[test]
+fn de_header_1_byte_0s() {
+    let hdr = DeHeader { de_type: 0_u32.into(), len: 0_u8.try_into().unwrap() };
+
+    assert_eq!(&[0x00], hdr.serialize().as_slice());
+}
+
+#[test]
+fn de_header_1_byte_max() {
+    let hdr = DeHeader { de_type: 15_u32.into(), len: 7_u8.try_into().unwrap() };
+
+    assert_eq!(&[0x7F], hdr.serialize().as_slice());
+}
+
+#[test]
+fn de_header_2_byte_len_too_big() {
+    let hdr = DeHeader { de_type: 15_u32.into(), len: 8_u8.try_into().unwrap() };
+
+    assert_eq!(&[0x88, 0x0F], hdr.serialize().as_slice());
+}
+
+#[test]
+fn de_header_2_byte_type_too_big() {
+    let hdr = DeHeader { de_type: 16_u32.into(), len: 7_u8.try_into().unwrap() };
+
+    assert_eq!(&[0x87, 0x10], hdr.serialize().as_slice());
+}
+
+#[test]
+fn de_header_max() {
+    let hdr = DeHeader { de_type: u32::MAX.into(), len: 127_u8.try_into().unwrap() };
+    assert_eq!(
+        // first type byte has 3x 0 bits because there are 35 total bits in 5 chunks of 7 bits, but
+        // only 32 bits to start with
+        &[0xFF, 0x8F, 0xFF, 0xFF, 0xFF, 0x7F],
+        hdr.serialize().as_slice()
+    );
+}
+
+#[test]
+fn de_header_special_values() {
+    for de_type in [0_u32, 1, 15, 16, u32::MAX - 1, u32::MAX].iter().map(|t| DeType::from(*t)) {
+        for len in [0_u8, 1, 7, 8, 126, 127].iter().map(|l| DeLength::try_from(*l).unwrap()) {
+            let hdr = DeHeader { de_type, len };
+            let buf = hdr.serialize();
+            let header_len = expected_header_len(hdr);
+
+            assert_eq!(header_len as usize, buf.len());
+
+            let (_, deser) = deserialize::DeHeader::parse(buf.as_slice()).unwrap();
+
+            assert_eq!(
+                deserialize::DeHeader { de_type, contents_len: len, header_bytes: buf },
+                deser
+            )
+        }
+    }
+}
+
+#[test]
+fn de_header_random_roundtrip() {
+    let mut rng = rand_ext::seeded_rng();
+
+    for _ in 0..100_000 {
+        let hdr = DeHeader { de_type: rng.gen(), len: rng.gen() };
+        let buf = hdr.serialize();
+        let header_len = expected_header_len(hdr);
+
+        assert_eq!(header_len as usize, buf.len());
+        let (_, deser) = deserialize::DeHeader::parse(buf.as_slice()).unwrap();
+
+        assert_eq!(
+            deserialize::DeHeader {
+                de_type: hdr.de_type,
+                contents_len: hdr.len,
+                header_bytes: buf
+            },
+            deser
+        )
+    }
+}
+
+fn expected_header_len(hdr: DeHeader) -> u8 {
+    if hdr.de_type.as_u32() <= 15 && hdr.len.len <= 7 {
+        1
+    } else {
+        // at least one type byte to handle the type = 0 case
+        1_u8 + cmp::max(1, (32 - hdr.de_type.as_u32().leading_zeros() as u8 + 6) / 7)
+    }
+}
+
+impl distributions::Distribution<DeLength> for distributions::Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> DeLength {
+        DeLength::try_from(rng.gen_range(0_u8..128)).unwrap()
+    }
+}
+
+impl distributions::Distribution<DeType> for distributions::Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> DeType {
+        rng.gen::<u32>().into()
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/serialize/mod.rs b/nearby/presence/np_adv/src/extended/serialize/mod.rs
new file mode 100644
index 0000000..6cedd1e
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/serialize/mod.rs
@@ -0,0 +1,865 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Serialization support for V1 advertisements.
+//!
+//! # Examples
+//!
+//! Serialize some DEs without an adv salt:
+//!
+//! ```
+//! use np_adv::{
+//!     extended::{data_elements::*, serialize::*, de_type::DeType },
+//!     PublicIdentity
+//! };
+//! use np_adv::shared_data::TxPower;
+//!
+//! // no section identities or DEs need salt in this example
+//! let mut adv_builder = AdvBuilder::new();
+//! let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+//!
+//! section_builder.add_de(|_salt| TxPowerDataElement::from(TxPower::try_from(3).unwrap())).unwrap();
+//!
+//! // add some other DE with type = 1000
+//! section_builder.add_de_res(|_salt|
+//!     GenericDataElement::try_from( DeType::from(1000_u32), &[10, 11, 12, 13])
+//! ).unwrap();
+//!
+//! section_builder.add_to_advertisement();
+//!
+//! assert_eq!(
+//!     &[
+//!         0x20, // adv header
+//!         10, // section header
+//!         0x03, // public identity
+//!         0x15, 3, // tx power
+//!         0x84, 0x87, 0x68, 10, 11, 12, 13, // other DE
+//!     ],
+//!     adv_builder.into_advertisement().as_slice()
+//! );
+//! ```
+//!
+//! Serialize some DEs in an adv with an encrypted section:
+//!
+//! ```
+//! use np_adv::{
+//!     de_type::EncryptedIdentityDataElementType,
+//!     extended::{data_elements::*, serialize::*, de_type::DeType },
+//! };
+//! use rand::{Rng as _, SeedableRng as _};
+//! use crypto_provider::{CryptoProvider, CryptoRng};
+//! use crypto_provider_default::CryptoProviderImpl;
+//! use np_adv::shared_data::TxPower;
+//!
+//! let mut adv_builder = AdvBuilder::new();
+//!
+//! // these would come from the credential//!
+//! let mut rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+//! let metadata_key: [u8; 16] = rng.gen();
+//! let key_seed: [u8; 32] = rng.gen();
+//! // use your preferred crypto impl
+//! let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+//!
+//! let mut section_builder = adv_builder.section_builder(MicEncrypted::new_random_salt(
+//!     &mut rng,
+//!     EncryptedIdentityDataElementType::Private,
+//!     &metadata_key,
+//!     &key_seed_hkdf,
+//! )).unwrap();
+//!
+//! section_builder.add_de(|_salt| TxPowerDataElement::from(TxPower::try_from(3).unwrap())).unwrap();
+//!
+//! // add some other DE with type = 1000
+//! section_builder.add_de_res(|salt|
+//!     GenericDataElement::try_from(
+//!         DeType::from(1000_u32),
+//!         &do_fancy_crypto(salt.derive::<16>().expect("16 is a valid HKDF length")))
+//! ).unwrap();
+//!
+//! section_builder.add_to_advertisement();
+//!
+//! // can't assert much about this since most of it is random
+//! assert_eq!(
+//!     0x20, // adv header
+//!     adv_builder.into_advertisement().as_slice()[0]
+//! );
+//!
+//! // A hypothetical function that uses the per-DE derived salt to do something like encrypt or
+//! // otherwise scramble data
+//! fn do_fancy_crypto(derived_salt: [u8; 16]) -> [u8; 16] {
+//!     // flipping bits is just a nonsense example, do something real here
+//!     derived_salt.iter().map(|b| !b)
+//!         .collect::<Vec<_>>()
+//!         .try_into().expect("array sizes match")
+//! }
+//! ```
+use crate::extended::NP_V1_ADV_MAX_SECTION_COUNT;
+use crate::{
+    de_type::{EncryptedIdentityDataElementType, IdentityDataElementType},
+    extended::{
+        data_elements::EncryptionInfoDataElement,
+        de_type::{DeType, ExtendedDataElementType},
+        deserialize::{EncryptedIdentityMetadata, EncryptionInfo, SectionMic},
+        section_signature_payload::*,
+        to_array_view, DeLength, BLE_ADV_SVC_CONTENT_LEN, NP_ADV_MAX_SECTION_LEN,
+    },
+    DeLengthOutOfRange, PublicIdentity, NP_SVC_UUID,
+};
+use array_view::ArrayView;
+use core::fmt;
+use core::marker::PhantomData;
+use crypto_provider::{
+    aes::{
+        ctr::{AesCtr, AesCtrNonce, NonceAndCounter},
+        Aes128Key,
+    },
+    hmac::Hmac,
+    CryptoProvider, CryptoRng,
+};
+use np_hkdf::v1_salt;
+use np_hkdf::v1_salt::{DataElementOffset, V1Salt};
+use sink::Sink;
+
+#[cfg(test)]
+pub(crate) mod adv_tests;
+#[cfg(test)]
+mod de_header_tests;
+#[cfg(test)]
+pub(crate) mod section_tests;
+#[cfg(test)]
+mod test_vectors;
+
+/// Builder for V1 advertisements.
+#[derive(Debug)]
+pub struct AdvBuilder {
+    /// Contains the adv header byte
+    adv: tinyvec::ArrayVec<[u8; BLE_ADV_SVC_CONTENT_LEN]>,
+    section_count: usize,
+}
+
+impl AdvBuilder {
+    /// Build an [AdvBuilder].
+    pub fn new() -> AdvBuilder {
+        let mut adv = tinyvec::ArrayVec::new();
+        // version 1, 0bVVVRRRRR
+        adv.push(0b00100000);
+
+        AdvBuilder { adv, section_count: 0 }
+    }
+
+    /// Create a section builder.
+    ///
+    /// Returns `Err` if there isn't room in the advertisement for the section at its minimum length
+    /// with its chosen identity.
+    ///
+    /// The builder will not accept more DEs than can fit given the space already used in the
+    /// advertisement by previous sections, if any.
+    ///
+    /// Once the builder is populated, add it to the originating advertisement with
+    /// [SectionBuilder.add_to_advertisement].
+    pub fn section_builder<I: SectionIdentity>(
+        &mut self,
+        identity: I,
+    ) -> Result<SectionBuilder<I>, AddSectionError> {
+        // section header and identity prefix
+        let prefix_len = 1 + I::PREFIX_LEN;
+        let minimum_section_len = prefix_len + I::SUFFIX_LEN;
+        // the max overall len available to the section
+        let available_len = self.adv.capacity() - self.adv.len();
+
+        if available_len < minimum_section_len {
+            return Err(AddSectionError::InsufficientAdvSpace);
+        }
+
+        if self.section_count >= NP_V1_ADV_MAX_SECTION_COUNT {
+            return Err(AddSectionError::MaxSectionCountExceeded);
+        }
+
+        let mut section = tinyvec::ArrayVec::new();
+        // placeholder for section header and identity prefix
+        section.resize(prefix_len, 0);
+
+        Ok(SectionBuilder {
+            section: CapacityLimitedVec {
+                vec: section,
+                // won't underflow: checked above
+                capacity: available_len - I::SUFFIX_LEN,
+            },
+            identity,
+            adv_builder: self,
+            next_de_offset: I::INITIAL_DE_OFFSET,
+        })
+    }
+
+    /// Convert the builder into an encoded advertisement.
+    pub fn into_advertisement(self) -> EncodedAdvertisement {
+        EncodedAdvertisement { adv: to_array_view(self.adv) }
+    }
+
+    /// Add the section, which must have come from a SectionBuilder generated from this, into this
+    /// advertisement.
+    fn add_section(&mut self, section: EncodedSection) {
+        self.adv
+            .try_extend_from_slice(section.as_slice())
+            .expect("section capacity enforced in the section builder");
+        self.section_count += 1;
+    }
+
+    fn header_byte(&self) -> u8 {
+        self.adv[0]
+    }
+}
+
+impl Default for AdvBuilder {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Errors that can occur when adding a section to an advertisement
+#[derive(Debug, PartialEq, Eq)]
+pub enum AddSectionError {
+    /// The advertisement doesn't have enough space to hold the minimum size of the section
+    InsufficientAdvSpace,
+    /// The advertisement can only hold a maximum of NP_V1_ADV_MAX_SECTION_COUNT number of sections
+    MaxSectionCountExceeded,
+}
+
+/// Derived salt for an individual data element.
+pub struct DeSalt<C: CryptoProvider> {
+    salt: V1Salt<C>,
+    de_offset: DataElementOffset,
+}
+
+impl<C: CryptoProvider> DeSalt<C> {
+    /// Derive salt of the requested length.
+    ///
+    /// The length must be a valid HKDF-SHA256 length.
+    pub fn derive<const N: usize>(&self) -> Option<[u8; N]> {
+        self.salt.derive(Some(self.de_offset))
+    }
+}
+
+/// An encoded NP V1 advertisement, starting with the NP advertisement header byte.
+#[derive(Debug, PartialEq, Eq)]
+pub struct EncodedAdvertisement {
+    adv: ArrayView<u8, BLE_ADV_SVC_CONTENT_LEN>,
+}
+
+impl EncodedAdvertisement {
+    /// Returns the advertisement as a slice.
+    pub fn as_slice(&self) -> &[u8] {
+        self.adv.as_slice()
+    }
+}
+
+/// The encoded form of an advertisement section
+type EncodedSection = ArrayView<u8, NP_ADV_MAX_SECTION_LEN>;
+
+/// Accumulates data elements and encodes them into a section.
+#[derive(Debug)]
+pub struct SectionBuilder<'a, I: SectionIdentity> {
+    /// Contains the section header, the identity-specified overhead, and any DEs added
+    pub(crate) section: CapacityLimitedVec<u8, NP_ADV_MAX_SECTION_LEN>,
+    identity: I,
+    /// mut ref to enforce only one active section builder at a time
+    adv_builder: &'a mut AdvBuilder,
+    next_de_offset: DataElementOffset,
+}
+
+impl<'a, I: SectionIdentity> SectionBuilder<'a, I> {
+    /// Add this builder to the advertisement that created it.
+    pub fn add_to_advertisement(self) {
+        let adv_builder = self.adv_builder;
+        adv_builder.add_section(Self::build_section(
+            self.section.into_inner(),
+            self.identity,
+            adv_builder,
+        ))
+    }
+
+    /// Add a data element to the section with a closure that returns a `Result`.
+    ///
+    /// The provided `build_de` closure will be invoked with the derived salt for this DE.
+    pub fn add_de_res<W: WriteDataElement, E, F: FnOnce(I::DerivedSalt) -> Result<W, E>>(
+        &mut self,
+        build_de: F,
+    ) -> Result<(), AddDataElementError<E>> {
+        let writer = build_de(self.identity.de_salt(self.next_de_offset))
+            .map_err(AddDataElementError::BuildDeError)?;
+
+        let orig_len = self.section.len();
+        // since we own the writer, and it's immutable, no race risk writing header w/ len then
+        // the contents as long as it's not simply an incorrect impl
+        let de_header = writer.de_header();
+        let content_len = self
+            .section
+            .try_extend_from_slice(de_header.serialize().as_slice())
+            .ok_or(AddDataElementError::InsufficientSectionSpace)
+            .and_then(|_| {
+                let after_header_len = self.section.len();
+                writer
+                    .write_de_contents(&mut self.section)
+                    .ok_or(AddDataElementError::InsufficientSectionSpace)
+                    .map(|_| self.section.len() - after_header_len)
+            })
+            .map_err(|e| {
+                // if anything went wrong, truncate any partial writes (e.g. just the header)
+                self.section.truncate(orig_len);
+                e
+            })?;
+
+        if content_len != de_header.len.as_usize() {
+            panic!(
+                "Buggy WriteDataElement impl: header len {}, actual written len {}",
+                de_header.len.as_usize(),
+                content_len
+            );
+        }
+
+        self.next_de_offset = self.next_de_offset.incremented();
+
+        Ok(())
+    }
+
+    /// Add a data element to the section with a closure that returns the data element directly.
+    ///
+    /// The provided `build_de` closure will be invoked with the derived salt for this DE.
+    pub fn add_de<W: WriteDataElement, F: FnOnce(I::DerivedSalt) -> W>(
+        &mut self,
+        build_de: F,
+    ) -> Result<(), AddDataElementError<()>> {
+        self.add_de_res(|derived_salt| Ok::<_, ()>(build_de(derived_salt)))
+    }
+
+    /// Convert a section builder's contents into an encoded section.
+    ///
+    /// Implemented without self to avoid partial-move issues.
+    fn build_section(
+        mut section_contents: tinyvec::ArrayVec<[u8; NP_ADV_MAX_SECTION_LEN]>,
+        mut identity: I,
+        adv_builder: &AdvBuilder,
+    ) -> EncodedSection {
+        // there is space because the capacity for DEs was restricted to allow it
+        section_contents.resize(section_contents.len() + I::SUFFIX_LEN, 0);
+
+        section_contents[0] = section_contents
+            .len()
+            .try_into()
+            .ok()
+            .and_then(|len: u8| len.checked_sub(1))
+            .expect("section length is always <=255 and non-negative");
+
+        identity.postprocess(
+            adv_builder.header_byte(),
+            section_contents[0],
+            &mut section_contents[1..],
+        );
+
+        to_array_view(section_contents)
+    }
+}
+
+/// Errors for adding a DE to a section
+#[derive(Debug, PartialEq, Eq)]
+pub enum AddDataElementError<E> {
+    /// An error occurred when invoking the DE builder closure.
+    BuildDeError(E),
+    /// Too much data to fit into the section
+    InsufficientSectionSpace,
+}
+
+/// The identity used for an individual section.
+pub trait SectionIdentity {
+    /// How much space needs to be reserved for this identity's prefix bytes after the section
+    /// header and before other DEs
+    const PREFIX_LEN: usize;
+
+    /// How much space needs to be reserved after the DEs
+    const SUFFIX_LEN: usize;
+
+    /// The DE offset to use for any DEs added to the section
+    const INITIAL_DE_OFFSET: DataElementOffset;
+
+    /// Postprocess the contents of the section (the data after the section header byte), which will
+    /// start with [Self::PREFIX_LEN] bytes set aside for the identity's use, and similarly end with
+    /// [Self::SUFFIX_LEN] bytes, with DEs (if any) in the middle.
+    fn postprocess(&mut self, adv_header_byte: u8, section_header: u8, section_contents: &mut [u8]);
+
+    /// The type of derived salt produced for a DE sharing a section with this identity.
+    type DerivedSalt;
+
+    /// Produce a `Self::Output` salt for a DE.
+    fn de_salt(&self, de_offset: DataElementOffset) -> Self::DerivedSalt;
+}
+
+impl SectionIdentity for PublicIdentity {
+    /// 1 byte of public identity DE header
+    const PREFIX_LEN: usize = 1;
+    const SUFFIX_LEN: usize = 0;
+    /// Room for the public DE
+    const INITIAL_DE_OFFSET: DataElementOffset = DataElementOffset::ZERO.incremented();
+
+    fn postprocess(
+        &mut self,
+        _adv_header_byte: u8,
+        _section_header: u8,
+        section_contents: &mut [u8],
+    ) {
+        section_contents[0..1].copy_from_slice(
+            DeHeader { len: DeLength::ZERO, de_type: IdentityDataElementType::Public.type_code() }
+                .serialize()
+                .as_slice(),
+        )
+    }
+
+    type DerivedSalt = ();
+
+    fn de_salt(&self, _de_offset: DataElementOffset) -> Self::DerivedSalt {}
+}
+
+/// Encrypts the data elements and protects integrity with a MIC using key material derived from
+/// an NP identity.
+pub struct MicEncrypted<'a, C: CryptoProvider> {
+    identity_type: EncryptedIdentityDataElementType,
+    salt: V1Salt<C>,
+    identity_payload: &'a [u8; 16],
+    aes_key: Aes128Key,
+    mic_hmac_key: np_hkdf::NpHmacSha256Key<C>,
+}
+
+impl<'a, C: CryptoProvider> MicEncrypted<'a, C> {
+    /// Build a [MicEncrypted] from the provided identity info with a random salt.
+    pub fn new_random_salt(
+        rng: &mut C::CryptoRng,
+        identity_type: EncryptedIdentityDataElementType,
+        identity_payload: &'a [u8; 16],
+        keys: &impl np_hkdf::UnsignedSectionKeys<C>,
+    ) -> Self {
+        let salt: V1Salt<C> = rng.gen::<[u8; 16]>().into();
+        Self::new(identity_type, salt, identity_payload, keys)
+    }
+
+    /// Build a [MicEncrypted] from the provided identity info.
+    fn new(
+        identity_type: EncryptedIdentityDataElementType,
+        salt: V1Salt<C>,
+        identity_payload: &'a [u8; 16],
+        keys: &impl np_hkdf::UnsignedSectionKeys<C>,
+    ) -> Self {
+        MicEncrypted {
+            identity_type,
+            salt,
+            identity_payload,
+            aes_key: keys.aes_key(),
+            mic_hmac_key: keys.hmac_key(),
+        }
+    }
+
+    /// Build a [MicEncrypted] from the provided identity info. Exposed outside of this crate for
+    /// testing purposes only.
+    #[cfg(any(test, feature = "testing"))]
+    pub fn new_for_testing(
+        identity_type: EncryptedIdentityDataElementType,
+        salt: V1Salt<C>,
+        identity_payload: &'a [u8; 16],
+        keys: &impl np_hkdf::UnsignedSectionKeys<C>,
+    ) -> Self {
+        Self::new(identity_type, salt, identity_payload, keys)
+    }
+}
+
+impl<'a, C: CryptoProvider> SectionIdentity for MicEncrypted<'a, C> {
+    const PREFIX_LEN: usize =
+        EncryptionInfo::TOTAL_DE_LEN + EncryptedIdentityMetadata::TOTAL_DE_LEN;
+    /// Length of mic
+    const SUFFIX_LEN: usize = SectionMic::CONTENTS_LEN;
+    /// Room for the mic, encryption info, and identity DEs
+    const INITIAL_DE_OFFSET: DataElementOffset =
+        DataElementOffset::ZERO.incremented().incremented();
+
+    fn postprocess(
+        &mut self,
+        adv_header_byte: u8,
+        section_header: u8,
+        section_contents: &mut [u8],
+    ) {
+        // prefix byte layout:
+        // 0-18: Encryption Info DE (header + scheme + salt)
+        // 19-20: Identity DE header
+        // 21-36: Identity DE contents (metadata key)
+
+        // Encryption Info DE
+        let encryption_info_bytes = EncryptionInfoDataElement::mic(
+            self.salt.as_slice().try_into().expect("Salt should be 16 bytes"),
+        )
+        .serialize();
+        section_contents[0..19].copy_from_slice(&encryption_info_bytes);
+
+        // Identity DE
+        let identity_header = identity_de_header(self.identity_type, self.identity_payload);
+        section_contents[19..21].copy_from_slice(identity_header.serialize().as_slice());
+        section_contents[21..37].copy_from_slice(self.identity_payload);
+
+        // DE offset for identity is 1: Encryption Info DE, Identity DE, then other DEs
+        let nonce: AesCtrNonce = self
+            .de_salt(v1_salt::DataElementOffset::from(1))
+            .derive()
+            .expect("AES-CTR nonce is a valid HKDF length");
+
+        let mut cipher = C::AesCtr128::new(&self.aes_key, NonceAndCounter::from_nonce(nonce));
+
+        let ciphertext_end = section_contents.len() - SectionMic::CONTENTS_LEN;
+
+        // encrypt just the part that should be ciphertext: identity DE contents and subsequent DEs
+        cipher.encrypt(&mut section_contents[21..ciphertext_end]);
+
+        // calculate MAC per the spec
+        let mut section_hmac = self.mic_hmac_key.build_hmac();
+        // svc uuid
+        section_hmac.update(NP_SVC_UUID.as_slice());
+        // adv header
+        section_hmac.update(&[adv_header_byte]);
+        // section header
+        section_hmac.update(&[section_header]);
+        // encryption info
+        section_hmac.update(&encryption_info_bytes);
+        // derived salt
+        section_hmac.update(&nonce);
+        // identity header + ciphertext
+        section_hmac.update(&section_contents[19..ciphertext_end]);
+
+        let mic: [u8; 32] = section_hmac.finalize();
+
+        // write truncated MIC
+        section_contents[ciphertext_end..].copy_from_slice(&mic[..SectionMic::CONTENTS_LEN]);
+    }
+
+    type DerivedSalt = DeSalt<C>;
+
+    fn de_salt(&self, de_offset: DataElementOffset) -> Self::DerivedSalt {
+        DeSalt { salt: V1Salt::from(*self.salt.as_array_ref()), de_offset }
+    }
+}
+
+/// Encrypts the data elements and protects integrity with an np_ed25519 signature
+/// using key material derived from an NP identity.
+pub struct SignedEncrypted<'a, C: CryptoProvider> {
+    identity_type: EncryptedIdentityDataElementType,
+    salt: V1Salt<C>,
+    metadata_key: &'a [u8; 16],
+    key_pair: &'a np_ed25519::KeyPair<C>,
+    aes_key: Aes128Key,
+    _marker: PhantomData<C>,
+}
+
+impl<'a, C: CryptoProvider> SignedEncrypted<'a, C> {
+    /// Build a [SignedEncrypted] from the provided identity material with a random salt.
+    pub fn new_random_salt(
+        rng: &mut C::CryptoRng,
+        identity_type: EncryptedIdentityDataElementType,
+        metadata_key: &'a [u8; 16],
+        key_pair: &'a np_ed25519::KeyPair<C>,
+        key_seed_hkdf: &np_hkdf::NpKeySeedHkdf<C>,
+    ) -> Self {
+        let salt: V1Salt<C> = rng.gen::<[u8; 16]>().into();
+        Self::new(identity_type, salt, metadata_key, key_pair, key_seed_hkdf)
+    }
+
+    /// Build a [SignedEncrypted] from the provided identity material.
+    pub(crate) fn new(
+        identity_type: EncryptedIdentityDataElementType,
+        salt: V1Salt<C>,
+        metadata_key: &'a [u8; 16],
+        key_pair: &'a np_ed25519::KeyPair<C>,
+        key_seed_hkdf: &np_hkdf::NpKeySeedHkdf<C>,
+    ) -> Self {
+        Self {
+            identity_type,
+            salt,
+            metadata_key,
+            key_pair,
+            aes_key: key_seed_hkdf.extended_signed_section_aes_key(),
+            _marker: Default::default(),
+        }
+    }
+}
+
+impl<'a, C: CryptoProvider> SectionIdentity for SignedEncrypted<'a, C> {
+    const PREFIX_LEN: usize =
+        EncryptionInfo::TOTAL_DE_LEN + EncryptedIdentityMetadata::TOTAL_DE_LEN;
+    /// Ed25519 signature
+    const SUFFIX_LEN: usize = crypto_provider::ed25519::SIGNATURE_LENGTH;
+    /// Room for the encryption info and identity DEs
+    const INITIAL_DE_OFFSET: DataElementOffset =
+        DataElementOffset::ZERO.incremented().incremented();
+
+    fn postprocess(
+        &mut self,
+        adv_header_byte: u8,
+        section_header: u8,
+        section_contents: &mut [u8],
+    ) {
+        let encryption_info_bytes = EncryptionInfoDataElement::signature(
+            self.salt.as_slice().try_into().expect("Salt should be 16 bytes"),
+        )
+        .serialize();
+        section_contents[0..19].copy_from_slice(&encryption_info_bytes);
+
+        let identity_header = identity_de_header(self.identity_type, self.metadata_key);
+        section_contents[19..21].copy_from_slice(identity_header.serialize().as_slice());
+        section_contents[21..37].copy_from_slice(self.metadata_key);
+
+        let nonce: AesCtrNonce = self
+            .de_salt(v1_salt::DataElementOffset::from(1))
+            .derive()
+            .expect("AES-CTR nonce is a valid HKDF length");
+
+        let (before_sig, sig) =
+            section_contents.split_at_mut(section_contents.len() - Self::SUFFIX_LEN);
+        let (encryption_info, after_encryption_info) =
+            before_sig.split_at(EncryptionInfo::TOTAL_DE_LEN);
+
+        let encryption_info: &[u8; EncryptionInfo::TOTAL_DE_LEN] =
+            encryption_info.try_into().unwrap();
+
+        // we need to sign the 16-byte IV, which doesn't have to actually fit in the adv, but we
+        // don't need a bigger buffer here since we won't be including the 66 bytes for the sig +
+        // header.
+        // If the stack usage ever becomes a problem, we can investigate pre hashing for the
+        // signature.
+        let nonce_ref = &nonce;
+        let section_signature_payload = SectionSignaturePayload::from_serialized_parts(
+            adv_header_byte,
+            section_header,
+            encryption_info,
+            nonce_ref,
+            after_encryption_info,
+        );
+
+        let signature = section_signature_payload.sign(self.key_pair);
+
+        sig[0..64].copy_from_slice(&signature.to_bytes());
+
+        let mut cipher = C::AesCtr128::new(&self.aes_key, NonceAndCounter::from_nonce(nonce));
+
+        // encrypt just the part that should be ciphertext: identity DE contents and subsequent DEs
+        cipher.encrypt(&mut section_contents[21..]);
+    }
+
+    type DerivedSalt = DeSalt<C>;
+
+    fn de_salt(&self, de_offset: DataElementOffset) -> Self::DerivedSalt {
+        DeSalt { salt: V1Salt::from(*self.salt.as_array_ref()), de_offset }
+    }
+}
+
+/// For DE structs that only implement one DE type, rather than multi-type impls.
+pub trait SingleTypeDataElement {
+    /// The DE type for the DE.
+    const DE_TYPE: DeType;
+}
+
+/// Writes data for a V1 DE into a provided buffer.
+///
+/// V1 data elements can be hundreds of bytes, so we ideally wouldn't even stack allocate a buffer
+/// big enough for that, hence an abstraction that writes into an existing buffer.
+pub trait WriteDataElement {
+    /// Returns the DE header that will be serialized into the section.
+    fn de_header(&self) -> DeHeader;
+    /// Write just the contents of the DE, returning `Some` if all contents could be written and
+    /// `None` otherwise.
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()>;
+}
+
+// convenience impl for &W
+impl<W: WriteDataElement> WriteDataElement for &W {
+    fn de_header(&self) -> DeHeader {
+        (*self).de_header()
+    }
+
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        (*self).write_de_contents(sink)
+    }
+}
+
+/// Serialization-specific representation of a DE header
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub struct DeHeader {
+    /// The length of the content of the DE
+    len: DeLength,
+    pub(crate) de_type: DeType,
+}
+
+impl DeHeader {
+    /// Build a DeHeader from the provided type and length
+    pub fn new(de_type: DeType, len: DeLength) -> Self {
+        DeHeader { de_type, len }
+    }
+
+    /// Serialize the DE header as per the V1 DE header format:
+    /// - 1 byte form for length <= 3 bits, type <= 4 bits: `0LLLTTTT`
+    /// - multi byte form: `0b1LLLLLLL [0b1TTTTTTT ...] 0b0TTTTTTT`
+    ///   - the shortest possible encoding must be used (no empty prefix type bytes)
+    ///
+    /// We assume that a 32-bit de type is sufficient, which would take at most 5 7-bit chunks to
+    /// encode, resulting in a total length of 6 bytes with the initial length byte.
+    pub(crate) fn serialize(&self) -> ArrayView<u8, 6> {
+        let mut buffer = [0; 6];
+        let de_type = self.de_type.as_u32();
+        let hi_bit = 0x80_u8;
+        let len = self.len.len;
+        if len < 8 && de_type < 16 {
+            buffer[0] = len << 4 | de_type as u8;
+            ArrayView::try_from_array(buffer, 1).expect("1 is a valid length")
+        } else {
+            // length w/ extended bit
+            buffer[0] = hi_bit | len;
+
+            // expand to a u64 so we can represent all 5 7-bit chunks of a u32, shifted so that
+            // it fills the top 5 * 7 = 35 bits after the high bit, which is left unset so that
+            // the MSB can be interpreted as a 7-bit chunk with an unset high bit.
+            let mut type64 = (de_type as u64) << (64 - 35 - 1);
+            let mut remaining_chunks = 5;
+            let mut chunks_written = 0;
+            // write 7 bit chunks, skipping leading 0 chunks
+            while remaining_chunks > 0 {
+                let chunk = type64.to_be_bytes()[0];
+                remaining_chunks -= 1;
+
+                // shift 7 more bits up, leaving the high bit unset
+                type64 = (type64 << 7) & (u64::MAX >> 1);
+
+                if chunks_written == 0 && chunk == 0 {
+                    // skip leading all-zero chunks
+                    continue;
+                }
+
+                buffer[1 + chunks_written] = chunk;
+                chunks_written += 1;
+            }
+            if chunks_written > 0 {
+                // fill in high bits for all but the last
+                for byte in buffer[1..chunks_written].iter_mut() {
+                    *byte |= hi_bit;
+                }
+
+                ArrayView::try_from_array(buffer, 1 + chunks_written).expect("length is at most 6")
+            } else {
+                // type byte is a leading 0 bit w/ 0 type, so use the existing 0 byte
+                ArrayView::try_from_array(buffer, 2).expect("2 is a valid length")
+            }
+        }
+    }
+}
+
+fn identity_de_header(
+    id_type: EncryptedIdentityDataElementType,
+    metadata_key: &[u8; 16],
+) -> DeHeader {
+    DeHeader {
+        de_type: id_type.type_code(),
+        len: metadata_key
+            .len()
+            .try_into()
+            .map_err(|_e| DeLengthOutOfRange)
+            .and_then(|len: u8| len.try_into())
+            .expect("metadata key is a valid DE length"),
+    }
+}
+
+/// A wrapper around a fixed-size tinyvec that can have its capacity further constrained to handle
+/// dynamic size limits.
+#[derive(Debug)]
+pub(crate) struct CapacityLimitedVec<T, const N: usize>
+where
+    T: fmt::Debug + Clone,
+    [T; N]: tinyvec::Array + fmt::Debug,
+    <[T; N] as tinyvec::Array>::Item: fmt::Debug + Clone,
+{
+    /// constraint on the occupied space in `vec`.
+    /// Invariant: `vec.len() <= constraint` and `vec.capacity() >= capacity`.
+    capacity: usize,
+    vec: tinyvec::ArrayVec<[T; N]>,
+}
+
+impl<T, const N: usize> CapacityLimitedVec<T, N>
+where
+    T: fmt::Debug + Clone,
+    [T; N]: tinyvec::Array + fmt::Debug,
+    <[T; N] as tinyvec::Array>::Item: fmt::Debug + Clone,
+{
+    pub(crate) fn len(&self) -> usize {
+        self.vec.len()
+    }
+
+    fn capacity(&self) -> usize {
+        self.capacity
+    }
+
+    fn truncate(&mut self, len: usize) {
+        self.vec.truncate(len);
+    }
+
+    fn into_inner(self) -> tinyvec::ArrayVec<[T; N]> {
+        self.vec
+    }
+}
+
+impl<T, const N: usize> Sink<<[T; N] as tinyvec::Array>::Item> for CapacityLimitedVec<T, N>
+where
+    T: fmt::Debug + Clone,
+    [T; N]: tinyvec::Array + fmt::Debug,
+    <[T; N] as tinyvec::Array>::Item: fmt::Debug + Clone,
+{
+    fn try_extend_from_slice(&mut self, items: &[<[T; N] as tinyvec::Array>::Item]) -> Option<()> {
+        if items.len() > (self.capacity() - self.len()) {
+            return None;
+        }
+        // won't panic: just checked the length
+        self.vec.extend_from_slice(items);
+        Some(())
+    }
+
+    fn try_push(&mut self, item: <[T; N] as tinyvec::Array>::Item) -> Option<()> {
+        if self.len() == self.capacity() {
+            // already full
+            None
+        } else {
+            self.vec.push(item);
+            Some(())
+        }
+    }
+}
+
+impl<T, const N: usize> AsRef<[<[T; N] as tinyvec::Array>::Item]> for CapacityLimitedVec<T, N>
+where
+    T: fmt::Debug + Clone,
+    [T; N]: tinyvec::Array + fmt::Debug,
+    <[T; N] as tinyvec::Array>::Item: fmt::Debug + Clone,
+{
+    fn as_ref(&self) -> &[<[T; N] as tinyvec::Array>::Item] {
+        self.vec.as_slice()
+    }
+}
+impl<T, const N: usize> AsMut<[<[T; N] as tinyvec::Array>::Item]> for CapacityLimitedVec<T, N>
+where
+    T: fmt::Debug + Clone,
+    [T; N]: tinyvec::Array + fmt::Debug,
+    <[T; N] as tinyvec::Array>::Item: fmt::Debug + Clone,
+{
+    fn as_mut(&mut self) -> &mut [<[T; N] as tinyvec::Array>::Item] {
+        self.vec.as_mut_slice()
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/serialize/section_tests.rs b/nearby/presence/np_adv/src/extended/serialize/section_tests.rs
new file mode 100644
index 0000000..af11076
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/serialize/section_tests.rs
@@ -0,0 +1,860 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use super::*;
+use crate::extended::serialize::AddSectionError::MaxSectionCountExceeded;
+use crate::{
+    extended::data_elements::{ContextSyncSeqNumDataElement, GenericDataElement},
+    shared_data::ContextSyncSeqNum,
+};
+use crypto_provider::aes::ctr::AES_CTR_NONCE_LEN;
+use crypto_provider_default::CryptoProviderImpl;
+use np_hkdf::v1_salt::V1Salt;
+use rand::rngs::StdRng;
+use rand::{prelude::SliceRandom as _, Rng as _, SeedableRng as _};
+use std::{prelude::rust_2021::*, vec};
+use strum::IntoEnumIterator as _;
+
+type KeyPair = np_ed25519::KeyPair<CryptoProviderImpl>;
+
+#[test]
+fn public_identity_section_empty() {
+    let mut adv_builder = AdvBuilder::new();
+    let section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+    assert_eq!(&[1_u8, 0x03], section_builder.into_section().as_slice());
+}
+
+#[test]
+fn mic_encrypted_identity_section_empty() {
+    do_mic_encrypted_identity_fixed_key_material_test::<DummyDataElement>(&[]);
+}
+
+#[test]
+fn mic_encrypted_identity_section_random_des() {
+    let mut rng = StdRng::from_entropy();
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+
+    for _ in 0..1_000 {
+        let num_des = rng.gen_range(1..=5);
+
+        let extra_des = (0..num_des)
+            .map(|_| {
+                let de_len = rng.gen_range(0..=30);
+                DummyDataElement {
+                    de_type: rng.gen_range(0_u32..=u32::MAX).into(),
+                    data: rand_ext::random_vec_rc(&mut rng, de_len),
+                }
+            })
+            .collect::<Vec<_>>();
+
+        let metadata_key = rng.gen();
+        let key_seed = rng.gen();
+        let identity_type =
+            *EncryptedIdentityDataElementType::iter().collect::<Vec<_>>().choose(&mut rng).unwrap();
+        let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+
+        let mut adv_builder = AdvBuilder::new();
+
+        let mut section_builder = adv_builder
+            .section_builder(MicEncrypted::new_random_salt(
+                &mut crypto_rng,
+                identity_type,
+                &metadata_key,
+                &key_seed_hkdf,
+            ))
+            .unwrap();
+        let section_salt =
+            V1Salt::<CryptoProviderImpl>::from(*section_builder.identity.salt.as_array_ref());
+
+        for de in extra_des.iter() {
+            section_builder.add_de(|_| de).unwrap();
+        }
+
+        // length 53: 19 for encryption info, 18 for identity, 16 for MIC
+        let section_length = 53
+            + extra_des
+                .iter()
+                .map(|de| {
+                    de.de_header().serialize().len() as u8 + de.de_header().len.as_usize() as u8
+                })
+                .sum::<u8>();
+
+        let encryption_info = [
+            &[
+                0x91, 0x10, // header
+                0x00, // scheme (mic)
+            ],
+            section_salt.as_slice(),
+        ]
+        .concat();
+
+        let identity_de_header =
+            DeHeader { len: 16_u8.try_into().unwrap(), de_type: identity_type.type_code() };
+
+        let mut hmac = np_hkdf::UnsignedSectionKeys::hmac_key(&key_seed_hkdf).build_hmac();
+        // just to be sure, we'll construct our test hmac all in one update() call
+        let mut hmac_input = vec![];
+        hmac_input.extend_from_slice(NP_SVC_UUID.as_slice());
+        hmac_input.push(0b00100000); // v1
+
+        // section header
+        hmac_input.push(section_length);
+        hmac_input.extend_from_slice(&encryption_info);
+        let nonce = section_salt.derive::<{ AES_CTR_NONCE_LEN }>(Some(1.into())).unwrap();
+        hmac_input.extend_from_slice(nonce.as_slice());
+
+        hmac_input.extend_from_slice(identity_de_header.serialize().as_slice());
+
+        let mut cipher = <CryptoProviderImpl as CryptoProvider>::AesCtr128::new(
+            &np_hkdf::UnsignedSectionKeys::aes_key(&key_seed_hkdf),
+            NonceAndCounter::from_nonce(nonce),
+        );
+        let mut plaintext = metadata_key.as_slice().to_vec();
+
+        for de in extra_des {
+            plaintext.extend_from_slice(de.de_header().serialize().as_slice());
+            de.write_de_contents(&mut plaintext);
+        }
+
+        cipher.encrypt(&mut plaintext);
+        let ciphertext = plaintext;
+
+        hmac_input.extend_from_slice(&ciphertext);
+
+        hmac.update(&hmac_input);
+        let mic = hmac.finalize();
+
+        let mut expected = vec![];
+        expected.push(section_length);
+        expected.extend_from_slice(&encryption_info);
+        expected.extend_from_slice(identity_de_header.serialize().as_slice());
+        expected.extend_from_slice(&ciphertext);
+        expected.extend_from_slice(&mic[..16]);
+
+        assert_eq!(&expected, section_builder.into_section().as_slice());
+    }
+}
+
+#[test]
+fn signature_encrypted_identity_section_empty() {
+    do_signature_encrypted_identity_fixed_key_material_test::<DummyDataElement>(&[]);
+}
+
+#[test]
+fn signature_encrypted_identity_section_random_des() {
+    let mut rng = StdRng::from_entropy();
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+
+    for _ in 0..1_000 {
+        let num_des = rng.gen_range(1..=5);
+
+        let metadata_key = rng.gen();
+        let key_seed = rng.gen();
+        let identity_type =
+            *EncryptedIdentityDataElementType::iter().collect::<Vec<_>>().choose(&mut rng).unwrap();
+        let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+
+        let mut adv_builder = AdvBuilder::new();
+        let key_pair = KeyPair::generate();
+
+        let mut section_builder = adv_builder
+            .section_builder(SignedEncrypted::new_random_salt(
+                &mut crypto_rng,
+                identity_type,
+                &metadata_key,
+                &key_pair,
+                &key_seed_hkdf,
+            ))
+            .unwrap();
+        let section_salt =
+            V1Salt::<CryptoProviderImpl>::from(*section_builder.identity.salt.as_array_ref());
+
+        let extra_des = (0..num_des)
+            .map(|_| {
+                let de_len = rng.gen_range(0..=30);
+                DummyDataElement {
+                    de_type: rng.gen_range(0_u32..=u32::MAX).into(),
+                    data: rand_ext::random_vec_rc(&mut rng, de_len),
+                }
+            })
+            // the DEs might not all fit; keep those that do
+            .filter_map(|de| section_builder.add_de(|_| de.clone()).ok().map(|_| de))
+            .collect::<Vec<_>>();
+
+        // 19 for encryption info, 18 for identity, 64 for signature
+        let section_length = 19
+            + 18
+            + 64
+            + extra_des
+                .iter()
+                .map(|de| {
+                    de.de_header().serialize().len() as u8 + de.de_header().len.as_usize() as u8
+                })
+                .sum::<u8>();
+
+        let encryption_info = [
+            &[
+                0x91, 0x10, // header
+                0x08, // scheme (signature)
+            ],
+            section_salt.as_slice(),
+        ]
+        .concat();
+        let encryption_info: [u8; EncryptionInfo::TOTAL_DE_LEN] =
+            encryption_info.try_into().unwrap();
+
+        let identity_de_header =
+            DeHeader { len: 16_u8.try_into().unwrap(), de_type: identity_type.type_code() };
+        let identity_de_header: [u8; 2] =
+            identity_de_header.serialize().as_slice().try_into().unwrap();
+
+        let nonce = section_salt.derive::<{ AES_CTR_NONCE_LEN }>(Some(1.into())).unwrap();
+
+        let mut plaintext = metadata_key.as_slice().to_vec();
+
+        for de in extra_des {
+            plaintext.extend_from_slice(de.de_header().serialize().as_slice());
+            de.write_de_contents(&mut plaintext);
+        }
+
+        let sig_payload = SectionSignaturePayload::from_deserialized_parts(
+            0x20,
+            section_length,
+            &encryption_info,
+            &nonce,
+            identity_de_header,
+            &plaintext,
+        );
+
+        plaintext.extend_from_slice(&sig_payload.sign(&key_pair).to_bytes());
+
+        <CryptoProviderImpl as CryptoProvider>::AesCtr128::new(
+            &key_seed_hkdf.extended_signed_section_aes_key(),
+            NonceAndCounter::from_nonce(nonce),
+        )
+        .encrypt(&mut plaintext);
+        let ciphertext = plaintext;
+
+        let mut expected = vec![section_length];
+        expected.extend_from_slice(&encryption_info);
+        expected.extend_from_slice(&identity_de_header);
+        expected.extend_from_slice(&ciphertext);
+
+        assert_eq!(&expected, section_builder.into_section().as_slice());
+    }
+}
+
+#[test]
+fn section_builder_too_full_doesnt_advance_de_index() {
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let key_seed = [22; 32];
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let metadata_key = [33; 16];
+    let mut section_builder = adv_builder
+        .section_builder(MicEncrypted::new_random_salt(
+            &mut crypto_rng,
+            EncryptedIdentityDataElementType::Trusted,
+            &metadata_key,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+    let salt = V1Salt::<CryptoProviderImpl>::from(*section_builder.identity.salt.as_array_ref());
+
+    section_builder
+        .add_de(|de_salt| DummyDataElement {
+            de_type: 100_u32.into(),
+            data: de_salt.derive::<100>().unwrap().to_vec(),
+        })
+        .unwrap();
+
+    // this write won't advance the de offset or the internal section buffer length
+    assert_eq!(
+        AddDataElementError::InsufficientSectionSpace,
+        section_builder
+            .add_de(|de_salt| DummyDataElement {
+                de_type: 101_u32.into(),
+                data: de_salt.derive::<100>().unwrap().to_vec(),
+            })
+            .unwrap_err()
+    );
+
+    section_builder
+        .add_de(|de_salt| DummyDataElement {
+            de_type: 102_u32.into(),
+            data: de_salt.derive::<10>().unwrap().to_vec(),
+        })
+        .unwrap();
+
+    section_builder.add_to_advertisement();
+
+    let mut expected = vec![];
+    // metadata key
+    expected.extend_from_slice(&metadata_key);
+    // de header
+    expected.extend_from_slice(&[0x80 + 100, 100]);
+    // section 0 de 2
+    expected.extend_from_slice(&salt.derive::<100>(Some(2.into())).unwrap());
+    // de header
+    expected.extend_from_slice(&[0x80 + 10, 102]);
+    // section 0 de 3
+    expected.extend_from_slice(&salt.derive::<10>(Some(3.into())).unwrap());
+
+    let mut cipher = <CryptoProviderImpl as CryptoProvider>::AesCtr128::new(
+        &np_hkdf::UnsignedSectionKeys::aes_key(&key_seed_hkdf),
+        NonceAndCounter::from_nonce(salt.derive(Some(1.into())).unwrap()),
+    );
+
+    cipher.encrypt(&mut expected);
+
+    let adv_bytes = adv_builder.into_advertisement();
+    // ignoring the MIC, etc, since that's tested elsewhere
+    let ciphertext_end = adv_bytes.as_slice().len() - 16;
+    assert_eq!(&expected, &adv_bytes.as_slice()[1 + 1 + 19 + 2..ciphertext_end])
+}
+
+#[test]
+fn section_de_fits_exactly() {
+    // leave room for initial filler section's header and the identities
+    for section_contents_capacity in 1..NP_ADV_MAX_SECTION_LEN - 3 {
+        let mut adv_builder = AdvBuilder::new();
+
+        // fill up space to produce desired capacity
+        let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+        // leave space for adv header, 2 section headers, the section identities, and desired second section capacity
+        fill_section_builder(
+            BLE_ADV_SVC_CONTENT_LEN - 1 - 2 - 2 - section_contents_capacity,
+            &mut section_builder,
+        );
+        section_builder.add_to_advertisement();
+
+        let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+
+        // fill it almost full
+        fill_section_builder(section_contents_capacity - 1, &mut section_builder);
+
+        assert_eq!(
+            1,
+            section_builder.section.capacity() - section_builder.section.len(),
+            "capacity: {section_contents_capacity}"
+        );
+
+        // can't add a 2 byte DE
+        assert_eq!(
+            Err(AddDataElementError::InsufficientSectionSpace),
+            section_builder.add_de_res(|_| GenericDataElement::try_from(1_u32.into(), &[0xFF])),
+            "capacity: {section_contents_capacity}"
+        );
+
+        // can add a 1 byte DE
+        section_builder.add_de_res(|_| GenericDataElement::try_from(1_u32.into(), &[])).unwrap();
+    }
+}
+
+#[test]
+fn section_builder_build_de_error_doesnt_advance_de_index() {
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let key_seed = [22; 32];
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let metadata_key = [33; 16];
+    let mut section_builder = adv_builder
+        .section_builder(MicEncrypted::new_random_salt(
+            &mut crypto_rng,
+            EncryptedIdentityDataElementType::Trusted,
+            &metadata_key,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+    let salt = V1Salt::<CryptoProviderImpl>::from(*section_builder.identity.salt.as_array_ref());
+
+    section_builder
+        .add_de(|de_salt| DummyDataElement {
+            de_type: 100_u32.into(),
+            data: de_salt.derive::<100>().unwrap().to_vec(),
+        })
+        .unwrap();
+
+    assert_eq!(
+        AddDataElementError::BuildDeError(()),
+        section_builder.add_de_res(|_| Err::<DummyDataElement, _>(())).unwrap_err()
+    );
+
+    section_builder
+        .add_de(|de_salt| DummyDataElement {
+            de_type: 103_u32.into(),
+            data: de_salt.derive::<10>().unwrap().to_vec(),
+        })
+        .unwrap();
+
+    section_builder.add_to_advertisement();
+
+    let mut expected = vec![];
+    // metadata key
+    expected.extend_from_slice(&metadata_key);
+    // de header
+    expected.extend_from_slice(&[0x80 + 100, 100]);
+    // section 0 de 2
+    expected.extend_from_slice(&salt.derive::<100>(Some(2.into())).unwrap());
+    // de header
+    expected.extend_from_slice(&[0x80 + 10, 103]);
+    // section 0 de 3
+    expected.extend_from_slice(&salt.derive::<10>(Some(3.into())).unwrap());
+
+    let mut cipher = <CryptoProviderImpl as CryptoProvider>::AesCtr128::new(
+        &np_hkdf::UnsignedSectionKeys::aes_key(&key_seed_hkdf),
+        NonceAndCounter::from_nonce(salt.derive(Some(1.into())).unwrap()),
+    );
+
+    cipher.encrypt(&mut expected);
+
+    let adv_bytes = adv_builder.into_advertisement();
+    // ignoring the MIC, etc, since that's tested elsewhere
+    let ciphertext_end = adv_bytes.as_slice().len() - 16;
+    assert_eq!(&expected, &adv_bytes.as_slice()[1 + 1 + 19 + 2..ciphertext_end])
+}
+
+#[test]
+fn add_multiple_de_correct_de_offsets_mic_encrypted_identity() {
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let key_seed = [22; 32];
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let metadata_key = [33; 16];
+    let mut section_builder = adv_builder
+        .section_builder(MicEncrypted::new_random_salt(
+            &mut crypto_rng,
+            EncryptedIdentityDataElementType::Trusted,
+            &metadata_key,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+    let salt = V1Salt::<CryptoProviderImpl>::from(*section_builder.identity.salt.as_array_ref());
+
+    section_builder
+        .add_de(|de_salt| DummyDataElement {
+            de_type: 64_u32.into(),
+            data: de_salt.derive::<16>().unwrap().to_vec(),
+        })
+        .unwrap();
+    section_builder
+        .add_de(|de_salt| DummyDataElement {
+            de_type: 65_u32.into(),
+            data: de_salt.derive::<16>().unwrap().to_vec(),
+        })
+        .unwrap();
+
+    section_builder.add_to_advertisement();
+
+    let mut expected = vec![];
+    // metadata key
+    expected.extend_from_slice(&metadata_key);
+    // de header
+    expected.extend_from_slice(&[0x90, 0x40]);
+    // section 0 de 2
+    expected.extend_from_slice(&salt.derive::<16>(Some(2.into())).unwrap());
+    // de header
+    expected.extend_from_slice(&[0x90, 0x41]);
+    // section 0 de 3
+    expected.extend_from_slice(&salt.derive::<16>(Some(3.into())).unwrap());
+
+    let mut cipher = <CryptoProviderImpl as CryptoProvider>::AesCtr128::new(
+        &np_hkdf::UnsignedSectionKeys::aes_key(&key_seed_hkdf),
+        NonceAndCounter::from_nonce(salt.derive(Some(1.into())).unwrap()),
+    );
+
+    cipher.encrypt(&mut expected);
+
+    let adv_bytes = adv_builder.into_advertisement();
+    // ignoring the MIC, etc, since that's tested elsewhere
+    let ciphertext_end = adv_bytes.as_slice().len() - 16;
+    assert_eq!(&expected, &adv_bytes.as_slice()[1 + 1 + 19 + 2..ciphertext_end])
+}
+
+#[test]
+fn add_multiple_de_correct_de_offsets_signature_encrypted_identity() {
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let key_seed = [22; 32];
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let metadata_key = [33; 16];
+    let key_pair = KeyPair::generate();
+    let mut section_builder = adv_builder
+        .section_builder(SignedEncrypted::new_random_salt(
+            &mut crypto_rng,
+            EncryptedIdentityDataElementType::Trusted,
+            &metadata_key,
+            &key_pair,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+    let salt = V1Salt::<CryptoProviderImpl>::from(*section_builder.identity.salt.as_array_ref());
+
+    section_builder
+        .add_de(|de_salt| DummyDataElement {
+            de_type: 64_u32.into(),
+            data: de_salt.derive::<16>().unwrap().to_vec(),
+        })
+        .unwrap();
+    section_builder
+        .add_de(|de_salt| DummyDataElement {
+            de_type: 65_u32.into(),
+            data: de_salt.derive::<16>().unwrap().to_vec(),
+        })
+        .unwrap();
+
+    section_builder.add_to_advertisement();
+
+    let mut expected = vec![];
+    // metadata key
+    expected.extend_from_slice(&metadata_key);
+    // de header
+    expected.extend_from_slice(&[0x90, 0x40]);
+    // section 0 de 2
+    expected.extend_from_slice(&salt.derive::<16>(Some(2.into())).unwrap());
+    // de header
+    expected.extend_from_slice(&[0x90, 0x41]);
+    // section 0 de 3
+    expected.extend_from_slice(&salt.derive::<16>(Some(3.into())).unwrap());
+
+    <CryptoProviderImpl as CryptoProvider>::AesCtr128::new(
+        &key_seed_hkdf.extended_signed_section_aes_key(),
+        NonceAndCounter::from_nonce(salt.derive(Some(1.into())).unwrap()),
+    )
+    .encrypt(&mut expected);
+
+    let adv_bytes = adv_builder.into_advertisement();
+    // ignoring the signature since that's tested elsewhere
+    assert_eq!(
+        &expected,
+        // adv header + salt + section header + encryption info + identity header
+        &adv_bytes.as_slice()[1 + 1 + 19 + 2..adv_bytes.as_slice().len() - 64]
+    )
+}
+
+#[test]
+fn signature_encrypted_section_de_lengths_allow_room_for_suffix() {
+    let mut crypto_rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let key_seed = [22; 32];
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let metadata_key = [33; 16];
+    let key_pair = KeyPair::generate();
+    let mut section_builder = adv_builder
+        .section_builder(SignedEncrypted::new_random_salt(
+            &mut crypto_rng,
+            EncryptedIdentityDataElementType::Trusted,
+            &metadata_key,
+            &key_pair,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    // section header + identity + signature
+    let max_total_de_len = NP_ADV_MAX_SECTION_LEN - 1 - 2 - 16 - 2 - 64;
+
+    // take up 100 bytes to put us within 1 DE of the limit
+    section_builder
+        .add_de(|_| DummyDataElement { de_type: 100_u32.into(), data: vec![0; 98] })
+        .unwrap();
+
+    // one byte too many won't fit
+    assert_eq!(
+        AddDataElementError::InsufficientSectionSpace,
+        section_builder
+            .add_de(|_| DummyDataElement {
+                de_type: 100_u32.into(),
+                data: vec![0; max_total_de_len - 100 - 1]
+            })
+            .unwrap_err()
+    );
+
+    // but this will, as it allows 2 bytes for this DE's header
+    assert_eq!(
+        AddDataElementError::InsufficientSectionSpace,
+        section_builder
+            .add_de(|_| DummyDataElement {
+                de_type: 100_u32.into(),
+                data: vec![0; max_total_de_len - 100 - 2]
+            })
+            .unwrap_err()
+    );
+}
+
+#[test]
+fn serialize_max_number_of_sections() {
+    let mut adv_builder = AdvBuilder::new();
+    for _ in 0..NP_V1_ADV_MAX_SECTION_COUNT {
+        let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+        section_builder.add_de(|_| context_sync_de(1)).unwrap();
+        section_builder.add_to_advertisement();
+    }
+    assert_eq!(
+        adv_builder.section_builder(PublicIdentity::default()).unwrap_err(),
+        MaxSectionCountExceeded
+    );
+}
+
+fn do_mic_encrypted_identity_fixed_key_material_test<W: WriteDataElement>(extra_des: &[W]) {
+    let metadata_key = [1; 16];
+    let key_seed = [2; 32];
+    let adv_header_byte = 0b00100000;
+    let section_salt: V1Salt<CryptoProviderImpl> = [3; 16].into();
+    let identity_type = EncryptedIdentityDataElementType::Private;
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder
+        .section_builder(MicEncrypted::new(
+            identity_type,
+            V1Salt::from(*section_salt.as_array_ref()),
+            &metadata_key,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    for de in extra_des {
+        section_builder.add_de(|_| de).unwrap();
+    }
+
+    // length 53: 19 for encryption info, 18 for identity, 16 for MIC
+    let section_length = 53
+        + extra_des
+            .iter()
+            .map(|de| de.de_header().serialize().len() as u8 + de.de_header().len.as_usize() as u8)
+            .sum::<u8>();
+
+    let encryption_info = [
+        &[
+            0x91, 0x10, // header
+            0x00, // scheme (mic)
+        ],
+        section_salt.as_slice(),
+    ]
+    .concat();
+
+    let identity_de_header =
+        DeHeader { len: 16_u8.try_into().unwrap(), de_type: identity_type.type_code() };
+
+    let mut hmac = np_hkdf::UnsignedSectionKeys::hmac_key(&key_seed_hkdf).build_hmac();
+    // just to be sure, we'll construct our test hmac all in one update() call
+    let mut hmac_input = vec![];
+    hmac_input.extend_from_slice(NP_SVC_UUID.as_slice());
+    hmac_input.push(adv_header_byte);
+    // section header
+    hmac_input.push(section_length);
+    hmac_input.extend_from_slice(&encryption_info);
+    let nonce = section_salt.derive::<{ AES_CTR_NONCE_LEN }>(Some(1.into())).unwrap();
+    hmac_input.extend_from_slice(nonce.as_slice());
+
+    hmac_input.extend_from_slice(identity_de_header.serialize().as_slice());
+
+    let mut cipher = <CryptoProviderImpl as CryptoProvider>::AesCtr128::new(
+        &np_hkdf::UnsignedSectionKeys::aes_key(&key_seed_hkdf),
+        NonceAndCounter::from_nonce(nonce),
+    );
+    let mut plaintext = metadata_key.as_slice().to_vec();
+
+    for de in extra_des {
+        plaintext.extend_from_slice(de.de_header().serialize().as_slice());
+        de.write_de_contents(&mut plaintext);
+    }
+
+    cipher.encrypt(&mut plaintext);
+    let ciphertext = plaintext;
+
+    hmac_input.extend_from_slice(&ciphertext);
+
+    hmac.update(&hmac_input);
+    let mic = hmac.finalize();
+
+    let mut expected = vec![];
+    expected.push(section_length);
+    expected.extend_from_slice(&encryption_info);
+    expected.extend_from_slice(identity_de_header.serialize().as_slice());
+    expected.extend_from_slice(&ciphertext);
+    expected.extend_from_slice(&mic[..16]);
+
+    assert_eq!(&expected, section_builder.into_section().as_slice());
+}
+
+fn do_signature_encrypted_identity_fixed_key_material_test<W: WriteDataElement>(extra_des: &[W]) {
+    let metadata_key = [1; 16];
+    let key_seed = [2; 32];
+    let adv_header_byte = 0b00100000;
+    let section_salt: V1Salt<CryptoProviderImpl> = [3; 16].into();
+    let identity_type = EncryptedIdentityDataElementType::Private;
+    let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let key_pair = KeyPair::generate();
+
+    let mut adv_builder = AdvBuilder::new();
+
+    let mut section_builder = adv_builder
+        .section_builder(SignedEncrypted::new(
+            identity_type,
+            V1Salt::from(*section_salt.as_array_ref()),
+            &metadata_key,
+            &key_pair,
+            &key_seed_hkdf,
+        ))
+        .unwrap();
+
+    for de in extra_des {
+        section_builder.add_de(|_| de).unwrap();
+    }
+
+    // 19 for encryption info, 18 for identity, 64 for sig
+    let section_length = 19
+        + 18
+        + 64
+        + extra_des
+            .iter()
+            .map(|de| de.de_header().serialize().len() as u8 + de.de_header().len.as_usize() as u8)
+            .sum::<u8>();
+
+    let encryption_info = [
+        &[
+            0x91, 0x10, // header
+            0x08, // scheme (signature)
+        ],
+        section_salt.as_slice(),
+    ]
+    .concat();
+    let encryption_info: [u8; EncryptionInfo::TOTAL_DE_LEN] = encryption_info.try_into().unwrap();
+
+    let identity_de_header =
+        DeHeader { len: 16_u8.try_into().unwrap(), de_type: identity_type.type_code() };
+    let identity_de_header: [u8; 2] = identity_de_header.serialize().as_slice().try_into().unwrap();
+
+    let mut plaintext = metadata_key.as_slice().to_vec();
+
+    for de in extra_des {
+        plaintext.extend_from_slice(de.de_header().serialize().as_slice());
+        de.write_de_contents(&mut plaintext);
+    }
+
+    let nonce = section_salt.derive(Some(1.into())).unwrap();
+
+    let sig_payload = SectionSignaturePayload::from_deserialized_parts(
+        adv_header_byte,
+        section_length,
+        &encryption_info,
+        &nonce,
+        identity_de_header,
+        &plaintext,
+    );
+
+    plaintext.extend_from_slice(&sig_payload.sign(&key_pair).to_bytes());
+
+    <CryptoProviderImpl as CryptoProvider>::AesCtr128::new(
+        &key_seed_hkdf.extended_signed_section_aes_key(),
+        NonceAndCounter::from_nonce(nonce),
+    )
+    .encrypt(&mut plaintext);
+    let ciphertext = plaintext;
+
+    let mut expected = vec![section_length];
+
+    expected.extend_from_slice(&encryption_info);
+    expected.extend_from_slice(&identity_de_header);
+    expected.extend_from_slice(&ciphertext);
+
+    assert_eq!(&expected, section_builder.into_section().as_slice());
+}
+
+/// Write `section_contents_len` bytes of DE and header into `section_builder`
+pub(crate) fn fill_section_builder<I: SectionIdentity>(
+    section_contents_len: usize,
+    section_builder: &mut SectionBuilder<I>,
+) {
+    // DEs can only go up to 127, so we'll need multiple for long sections
+    for _ in 0..(section_contents_len / 100) {
+        let de_contents = vec![0x33; 98];
+        section_builder
+            .add_de_res(|_| GenericDataElement::try_from(100_u32.into(), &de_contents))
+            .unwrap();
+    }
+
+    let remainder_len = section_contents_len % 100;
+    match remainder_len {
+        0 => {
+            // leave remainder empty
+        }
+        1 => {
+            // 1 byte header
+            section_builder
+                .add_de_res(|_| GenericDataElement::try_from(3_u32.into(), &[]))
+                .unwrap();
+        }
+        2 => {
+            // 2 byte header
+            section_builder
+                .add_de_res(|_| GenericDataElement::try_from(100_u32.into(), &[]))
+                .unwrap();
+        }
+        _ => {
+            // 2 byte header + contents as needed
+            // leave room for section and DE headers
+            let de_contents = vec![0x44; remainder_len - 2];
+            section_builder
+                .add_de_res(|_| GenericDataElement::try_from(100_u32.into(), &de_contents))
+                .unwrap();
+        }
+    }
+}
+
+#[derive(Clone)]
+pub(crate) struct DummyDataElement {
+    pub(crate) de_type: DeType,
+    pub(crate) data: Vec<u8>,
+}
+
+impl WriteDataElement for DummyDataElement {
+    fn de_header(&self) -> DeHeader {
+        DeHeader { de_type: self.de_type, len: self.data.len().try_into().unwrap() }
+    }
+
+    fn write_de_contents<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        sink.try_extend_from_slice(&self.data)
+    }
+}
+
+fn context_sync_de(num: u8) -> ContextSyncSeqNumDataElement {
+    ContextSyncSeqNumDataElement::from(ContextSyncSeqNum::try_from(num).unwrap())
+}
+
+pub(crate) trait SectionBuilderExt {
+    fn into_section(self) -> EncodedSection;
+}
+
+impl<'a, I: SectionIdentity> SectionBuilderExt for SectionBuilder<'a, I> {
+    /// Convenience method for tests
+    fn into_section(self) -> EncodedSection {
+        Self::build_section(self.section.into_inner(), self.identity, self.adv_builder)
+    }
+}
diff --git a/nearby/presence/np_adv/src/extended/serialize/test_vectors.rs b/nearby/presence/np_adv/src/extended/serialize/test_vectors.rs
new file mode 100644
index 0000000..9f7aa5c
--- /dev/null
+++ b/nearby/presence/np_adv/src/extended/serialize/test_vectors.rs
@@ -0,0 +1,192 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use crate::{
+    de_type::EncryptedIdentityDataElementType,
+    extended::serialize::{
+        section_tests::{DummyDataElement, SectionBuilderExt},
+        AdvBuilder, MicEncrypted,
+    },
+};
+use anyhow::anyhow;
+use crypto_provider::{aes::ctr::AES_CTR_NONCE_LEN, aes::AesKey};
+use crypto_provider_default::CryptoProviderImpl;
+use np_hkdf::v1_salt;
+use np_hkdf::v1_salt::V1Salt;
+use rand_ext::rand::{prelude::SliceRandom as _, Rng as _, SeedableRng as _};
+use serde_json::json;
+use std::{fs, io::Read as _, prelude::rust_2021::*, println};
+use strum::IntoEnumIterator as _;
+use test_helper::extract_key_array;
+
+#[test]
+fn mic_encrypted_test_vectors() -> Result<(), anyhow::Error> {
+    let full_path = test_helper::get_data_file(
+        "presence/np_adv/resources/test/mic-encrypted-test-vectors.json",
+    );
+    let mut file = fs::File::open(full_path)?;
+    let mut data = String::new();
+    file.read_to_string(&mut data)?;
+
+    let test_cases = match serde_json::de::from_str(&data)? {
+        serde_json::Value::Array(a) => a,
+        _ => return Err(anyhow!("bad json")),
+    };
+
+    for tc in test_cases {
+        {
+            let key_seed = extract_key_array::<32>(&tc, "key_seed");
+            let metadata_key = extract_key_array::<16>(&tc, "metadata_key");
+            let adv_header_byte = extract_key_array::<1>(&tc, "adv_header_byte")[0];
+            let section_salt = v1_salt::V1Salt::<CryptoProviderImpl>::from(
+                extract_key_array::<16>(&tc, "section_salt"),
+            );
+            let identity_type = tc["identity_type"].as_str().map(identity_type_from_label).unwrap();
+            let data_elements = tc["data_elements"]
+                .as_array()
+                .unwrap()
+                .iter()
+                .map(|json_de| DummyDataElement {
+                    data: hex::decode(json_de["contents"].as_str().unwrap()).unwrap(),
+                    de_type: (json_de["de_type"].as_u64().unwrap() as u32).into(),
+                })
+                .collect::<Vec<_>>();
+
+            let hkdf = np_hkdf::NpKeySeedHkdf::new(&key_seed);
+
+            assert_eq!(
+                extract_key_array::<16>(&tc, "aes_key").as_slice(),
+                np_hkdf::UnsignedSectionKeys::aes_key(&hkdf).as_slice()
+            );
+            assert_eq!(
+                extract_key_array::<32>(&tc, "section_mic_hmac_key").as_slice(),
+                np_hkdf::UnsignedSectionKeys::hmac_key(&hkdf).as_bytes()
+            );
+            assert_eq!(
+                extract_key_array::<{ AES_CTR_NONCE_LEN }>(&tc, "nonce").as_slice(),
+                section_salt.derive::<{ AES_CTR_NONCE_LEN }>(Some(1.into())).unwrap()
+            );
+
+            // make an adv builder in the configuration we need
+            let mut adv_builder = AdvBuilder::new();
+            assert_eq!(adv_header_byte, adv_builder.header_byte());
+
+            let mut section_builder = adv_builder
+                .section_builder(MicEncrypted::new(
+                    identity_type,
+                    section_salt,
+                    &metadata_key,
+                    &hkdf,
+                ))
+                .unwrap();
+
+            for de in data_elements {
+                section_builder.add_de(|_| de).unwrap();
+            }
+
+            assert_eq!(
+                hex::decode(tc["encoded_section"].as_str().unwrap()).unwrap(),
+                section_builder.into_section().as_slice()
+            );
+        }
+    }
+
+    Ok(())
+}
+
+#[ignore]
+#[test]
+fn gen_mic_encrypted_test_vectors() {
+    let mut rng = rand::rngs::StdRng::from_entropy();
+
+    let mut array = Vec::<serde_json::Value>::new();
+
+    for _ in 0..100 {
+        let num_des = rng.gen_range(0..=5);
+
+        let extra_des = (0..num_des)
+            .map(|_| {
+                let de_len = rng.gen_range(0..=30);
+                DummyDataElement {
+                    de_type: rng.gen_range(0_u32..=1_000).into(),
+                    data: rand_ext::random_vec_rc(&mut rng, de_len),
+                }
+            })
+            .collect::<Vec<_>>();
+
+        let metadata_key = rng.gen();
+        let key_seed = rng.gen();
+        let adv_header_byte = 0b00100000;
+        let identity_type =
+            *EncryptedIdentityDataElementType::iter().collect::<Vec<_>>().choose(&mut rng).unwrap();
+
+        let key_seed_hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+
+        let mut adv_builder = AdvBuilder::new();
+
+        let section_salt = v1_salt::V1Salt::<CryptoProviderImpl>::from(rng.gen::<[u8; 16]>());
+        let mut section_builder = adv_builder
+            .section_builder(MicEncrypted::new(
+                identity_type,
+                V1Salt::from(*section_salt.as_array_ref()),
+                &metadata_key,
+                &key_seed_hkdf,
+            ))
+            .unwrap();
+
+        for de in extra_des.iter() {
+            section_builder.add_de(|_| de).unwrap();
+        }
+
+        let nonce = section_salt.derive::<{ AES_CTR_NONCE_LEN }>(Some(1.into())).unwrap();
+
+        array
+            .push(json!({
+                "key_seed": hex::encode_upper(key_seed),
+                "metadata_key": hex::encode_upper(metadata_key),
+                "adv_header_byte": hex::encode_upper([adv_header_byte]),
+                "section_salt": hex::encode_upper(section_salt.as_slice()),
+                "identity_type": identity_type_label(identity_type),
+                "data_elements": extra_des.iter().map(|de| json!({
+                    "de_type": de.de_type.as_u32(),
+                    "contents": hex::encode_upper(&de.data)
+                })).collect::<Vec<_>>(),
+                "aes_key": hex::encode_upper(np_hkdf::UnsignedSectionKeys::aes_key(&key_seed_hkdf).as_slice()),
+                "nonce": hex::encode_upper(nonce),
+                "section_mic_hmac_key": hex::encode_upper(np_hkdf::UnsignedSectionKeys::hmac_key(&key_seed_hkdf).as_bytes()),
+                "encoded_section": hex::encode_upper(section_builder.into_section().as_slice())
+            }));
+    }
+
+    println!("{}", serde_json::ser::to_string_pretty(&array).unwrap());
+}
+
+fn identity_type_label(t: EncryptedIdentityDataElementType) -> &'static str {
+    match t {
+        EncryptedIdentityDataElementType::Private => "private",
+        EncryptedIdentityDataElementType::Trusted => "trusted",
+        EncryptedIdentityDataElementType::Provisioned => "provisioned",
+    }
+}
+
+fn identity_type_from_label(label: &str) -> EncryptedIdentityDataElementType {
+    match label {
+        "private" => EncryptedIdentityDataElementType::Private,
+        "trusted" => EncryptedIdentityDataElementType::Trusted,
+        "provisioned" => EncryptedIdentityDataElementType::Provisioned,
+        _ => panic!("unknown label: {}", label),
+    }
+}
diff --git a/nearby/presence/np_adv/src/header_parse_tests.rs b/nearby/presence/np_adv/src/header_parse_tests.rs
new file mode 100644
index 0000000..2da1b4a
--- /dev/null
+++ b/nearby/presence/np_adv/src/header_parse_tests.rs
@@ -0,0 +1,58 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use super::*;
+
+extern crate std;
+
+use nom::error;
+
+#[test]
+fn parse_header_v0() {
+    let (_, header) = parse_adv_header(&[0x00]).unwrap();
+    assert_eq!(AdvHeader::V0, header);
+}
+
+#[test]
+fn parse_header_v0_nonzero_reserved() {
+    let input = &[0x01];
+    assert_eq!(
+        nom::Err::Error(error::Error { input: input.as_slice(), code: error::ErrorKind::Verify }),
+        parse_adv_header(input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_header_v1_nonzero_reserved() {
+    let input = &[0x30];
+    assert_eq!(
+        nom::Err::Error(error::Error { input: input.as_slice(), code: error::ErrorKind::Verify }),
+        parse_adv_header(input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_header_bad_version() {
+    let input = &[0x80];
+    assert_eq!(
+        nom::Err::Error(error::Error { input: input.as_slice(), code: error::ErrorKind::Verify }),
+        parse_adv_header(input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_header_v1() {
+    let (_, header) = parse_adv_header(&[0x20]).unwrap();
+    assert_eq!(AdvHeader::V1(V1Header { header_byte: 0x20 }), header);
+}
diff --git a/nearby/presence/np_adv/src/legacy/actions/macros.rs b/nearby/presence/np_adv/src/legacy/actions/macros.rs
new file mode 100644
index 0000000..ecafeb3
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/actions/macros.rs
@@ -0,0 +1,138 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// Create a struct holding a `bool`.
+macro_rules! boolean_element_struct {
+    ($type_name:ident) => {
+        #[derive(Debug)]
+        #[allow(missing_docs)]
+        pub struct $type_name {
+            enabled: bool,
+        }
+    };
+}
+
+/// Create a `From<bool>` impl for a struct made with [boolean_element_struct].
+macro_rules! boolean_element_struct_from_bool {
+    ($type_name:ident) => {
+        impl From<bool> for $type_name {
+            fn from(value: bool) -> Self {
+                $type_name { enabled: value }
+            }
+        }
+    };
+}
+
+/// The guts of an ActionElement impl
+macro_rules! boolean_element_action_element_impl_shared {
+    ($type_name:ident, $index:expr) => {
+        const HIGH_BIT_INDEX: u32 = $index;
+        const BITS_LEN: u32 = 1;
+        const ACTION_TYPE: $crate::legacy::actions::ActionType =
+            $crate::legacy::actions::ActionType::$type_name;
+    };
+}
+
+/// Create a struct w/ From<bool> and ActionElement impls.
+/// Use `plaintext_only`, `ciphertext_only`, or `plaintext_and_ciphertext` to create appropriate
+/// impls.
+macro_rules! boolean_element {
+    ($type_name:ident, $index:expr, plaintext_only) => {
+        $crate::legacy::actions::macros::boolean_element_struct!($type_name);
+        $crate::legacy::actions::macros::boolean_element_struct_from_bool!($type_name);
+
+        impl $crate::legacy::actions::ActionElement for $type_name {
+            $crate::legacy::actions::macros::boolean_element_action_element_impl_shared!(
+                $type_name, $index
+            );
+
+            fn supports_flavor(flavor: $crate::legacy::PacketFlavorEnum) -> bool {
+                match flavor {
+                    $crate::legacy::PacketFlavorEnum::Plaintext => true,
+                    $crate::legacy::PacketFlavorEnum::Ciphertext => false,
+                }
+            }
+        }
+
+        $crate::legacy::actions::macros::boolean_element_to_plaintext_element!($type_name);
+    };
+    ($type_name:ident, $index:expr, ciphertext_only) => {
+        $crate::legacy::actions::macros::boolean_element_struct!($type_name);
+        $crate::legacy::actions::macros::boolean_element_struct_from_bool!($type_name);
+
+        impl $crate::legacy::actions::ActionElement for $type_name {
+            $crate::legacy::actions::macros::boolean_element_action_element_impl_shared!(
+                $type_name, $index
+            );
+
+            fn supports_flavor(flavor: $crate::legacy::PacketFlavorEnum) -> bool {
+                match flavor {
+                    $crate::legacy::PacketFlavorEnum::Plaintext => false,
+                    $crate::legacy::PacketFlavorEnum::Ciphertext => true,
+                }
+            }
+        }
+
+        $crate::legacy::actions::macros::boolean_element_to_encrypted_element!($type_name);
+    };
+    ($type_name:ident, $index:expr, plaintext_and_ciphertext) => {
+        $crate::legacy::actions::macros::boolean_element_struct!($type_name);
+        $crate::legacy::actions::macros::boolean_element_struct_from_bool!($type_name);
+
+        impl $crate::legacy::actions::ActionElement for $type_name {
+            $crate::legacy::actions::macros::boolean_element_action_element_impl_shared!(
+                $type_name, $index
+            );
+
+            fn supports_flavor(flavor: $crate::legacy::PacketFlavorEnum) -> bool {
+                match flavor {
+                    $crate::legacy::PacketFlavorEnum::Plaintext => true,
+                    $crate::legacy::PacketFlavorEnum::Ciphertext => true,
+                }
+            }
+        }
+
+        $crate::legacy::actions::macros::boolean_element_to_plaintext_element!($type_name);
+        $crate::legacy::actions::macros::boolean_element_to_encrypted_element!($type_name);
+    };
+}
+
+/// Create a [ToActionElement<Encrypted>] impl with the given index and length 1.
+macro_rules! boolean_element_to_encrypted_element {
+    ( $type_name:ident) => {
+        impl $crate::legacy::actions::ToActionElement<$crate::legacy::Ciphertext> for $type_name {
+            fn bits(&self) -> u8 {
+                self.enabled as u8
+            }
+        }
+    };
+}
+
+/// Create a [ToActionElement<Plaintext>] impl with the given index and length 1.
+macro_rules! boolean_element_to_plaintext_element {
+    ( $type_name:ident) => {
+        impl $crate::legacy::actions::ToActionElement<$crate::legacy::Plaintext> for $type_name {
+            fn bits(&self) -> u8 {
+                self.enabled as u8
+            }
+        }
+    };
+}
+
+// expose macros to the rest of the crate without macro_export's behavior of exporting at crate root
+pub(crate) use {
+    boolean_element, boolean_element_action_element_impl_shared, boolean_element_struct,
+    boolean_element_struct_from_bool, boolean_element_to_encrypted_element,
+    boolean_element_to_plaintext_element,
+};
diff --git a/nearby/presence/np_adv/src/legacy/actions/mod.rs b/nearby/presence/np_adv/src/legacy/actions/mod.rs
new file mode 100644
index 0000000..353848e
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/actions/mod.rs
@@ -0,0 +1,442 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! The "Actions" data element and associated types.
+//!
+//! This DE is somewhat more complex than other DEs. Whether or not it supports a particular flavor
+//! depends on the actions set, so it has to be treated as two separate types based on which
+//! flavor type parameter is used.
+use crate::{
+    legacy::{
+        data_elements::{DataElement, DataElementDeserializeError},
+        de_type::{DataElementType, PlainDataElementType},
+        serialize::{DataElementBundle, ToDataElementBundle},
+        Ciphertext, PacketFlavor, PacketFlavorEnum, Plaintext,
+    },
+    shared_data::ContextSyncSeqNum,
+};
+#[cfg(feature = "devtools")]
+use core::ops::Range;
+use core::{marker, num, ops};
+use nom::{bytes, combinator, error};
+use strum::IntoEnumIterator as _;
+
+mod macros;
+#[cfg(test)]
+pub(crate) mod tests;
+
+/// Actions DE.
+/// Only as many DE payload bytes will be present as needed to represent all set bits that are encoded,
+/// with a lower bound of 1 byte in the special case of no set action bits, and an upper bound
+/// of 3 bytes occupied by the DE payload.
+#[derive(Debug, PartialEq, Eq)]
+pub struct ActionsDataElement<F: PacketFlavor> {
+    action: ActionBits<F>,
+}
+
+impl<F: PacketFlavor> ActionsDataElement<F> {
+    /// Returns the actions bits as a u32. The upper limit of an actions field is 3 bytes,
+    /// so the last bytes of this u32 will always be 0
+    pub fn as_u32(self) -> u32 {
+        self.action.bits
+    }
+
+    /// Return whether a boolean action type is set in this data element, or `None` if the given
+    /// action type does not represent a boolean.
+    pub fn has_action(&self, action_type: &ActionType) -> Option<bool> {
+        (action_type.bits_len() == 1).then_some(self.action.bits_for_type(action_type) != 0)
+    }
+
+    /// Return the context sync sequence number.
+    pub fn context_sync_seq_num(&self) -> ContextSyncSeqNum {
+        ContextSyncSeqNum::try_from(self.action.bits_for_type(&ActionType::ContextSyncSeqNum) as u8)
+            .expect("Masking with ActionType::ContextSyncSeqNum should always be in range")
+    }
+}
+
+pub(crate) const ACTIONS_MAX_LEN: usize = 3;
+
+impl<F> ActionsDataElement<F>
+where
+    F: PacketFlavor,
+    ActionsDataElement<F>: DataElement,
+{
+    pub(crate) const ACTIONS_LEN: ops::RangeInclusive<usize> = (1..=ACTIONS_MAX_LEN);
+
+    /// Generic deserialize, not meant to be called directly -- use [DataElement] impls instead.
+    fn deserialize(de_contents: &[u8]) -> Result<Self, DataElementDeserializeError> {
+        combinator::all_consuming::<&[u8], _, error::Error<&[u8]>, _>(combinator::map(
+            bytes::complete::take_while_m_n(0, ACTIONS_MAX_LEN, |_| true),
+            |bytes: &[u8]| {
+                let mut action_bytes = [0_u8; 4];
+                action_bytes[..bytes.len()].copy_from_slice(bytes);
+                u32::from_be_bytes(action_bytes)
+            },
+        ))(de_contents)
+        .map_err(|_| DataElementDeserializeError::DeserializeError {
+            de_type: Self::DE_TYPE_VARIANT,
+        })
+        .map(|(_remaining, actions)| actions)
+        .and_then(|action_bits_num| {
+            let action = ActionBits::try_from(action_bits_num).map_err(|e| {
+                DataElementDeserializeError::FlavorNotSupported {
+                    de_type: Self::DE_TYPE_VARIANT,
+                    flavor: e.flavor,
+                }
+            })?;
+            Ok(Self { action })
+        })
+    }
+}
+
+impl<F: PacketFlavor> From<ActionBits<F>> for ActionsDataElement<F> {
+    fn from(action: ActionBits<F>) -> Self {
+        Self { action }
+    }
+}
+
+impl<F: PacketFlavor> ToDataElementBundle<F> for ActionsDataElement<F> {
+    fn to_de_bundle(&self) -> DataElementBundle<F> {
+        let action_byte_len = self.action.bytes_used();
+        let slice = &self.action.bits.to_be_bytes()[..action_byte_len];
+
+        DataElementBundle::try_from(PlainDataElementType::Actions, slice)
+            .expect("Length < max DE size")
+    }
+}
+
+impl DataElement for ActionsDataElement<Plaintext> {
+    const DE_TYPE_VARIANT: DataElementType = DataElementType::Actions;
+
+    fn supports_flavor(flavor: PacketFlavorEnum) -> bool {
+        match flavor {
+            PacketFlavorEnum::Plaintext => true,
+            PacketFlavorEnum::Ciphertext => false,
+        }
+    }
+
+    fn deserialize<F: PacketFlavor>(
+        de_contents: &[u8],
+    ) -> Result<Self, DataElementDeserializeError> {
+        match F::ENUM_VARIANT {
+            PacketFlavorEnum::Plaintext => ActionsDataElement::deserialize(de_contents),
+            PacketFlavorEnum::Ciphertext => Err(DataElementDeserializeError::FlavorNotSupported {
+                de_type: DataElementType::Actions,
+                flavor: F::ENUM_VARIANT,
+            }),
+        }
+    }
+}
+
+impl DataElement for ActionsDataElement<Ciphertext> {
+    const DE_TYPE_VARIANT: DataElementType = DataElementType::Actions;
+
+    fn supports_flavor(flavor: PacketFlavorEnum) -> bool {
+        match flavor {
+            PacketFlavorEnum::Plaintext => false,
+            PacketFlavorEnum::Ciphertext => true,
+        }
+    }
+
+    fn deserialize<F: PacketFlavor>(
+        de_contents: &[u8],
+    ) -> Result<Self, DataElementDeserializeError> {
+        match F::ENUM_VARIANT {
+            PacketFlavorEnum::Plaintext => Err(DataElementDeserializeError::FlavorNotSupported {
+                de_type: DataElementType::Actions,
+                flavor: F::ENUM_VARIANT,
+            }),
+            PacketFlavorEnum::Ciphertext => ActionsDataElement::deserialize(de_contents),
+        }
+    }
+}
+
+/// Container for the 24 bits defined for "actions" (feature flags and the like).
+/// This internally stores a u32, but only the 24 highest bits of this
+/// field will actually ever be populated.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub struct ActionBits<F: PacketFlavor> {
+    bits: u32,
+    // marker for element type
+    flavor: marker::PhantomData<F>,
+}
+
+impl<F: PacketFlavor> Default for ActionBits<F> {
+    fn default() -> Self {
+        ActionBits {
+            bits: 0, // no bits set
+            flavor: marker::PhantomData,
+        }
+    }
+}
+
+/// At least one action doesn't support the required flavor
+#[derive(PartialEq, Eq, Debug)]
+pub struct FlavorNotSupported {
+    flavor: PacketFlavorEnum,
+}
+
+lazy_static::lazy_static! {
+    /// All bits for plaintext action types: 1 where a plaintext action could have a bit, 0 elsewhere.
+    static ref ALL_PLAINTEXT_ELEMENT_BITS: u32 = ActionType::iter()
+        .filter(|t| t.supports_flavor(PacketFlavorEnum::Plaintext))
+        .map(|t| t.all_bits())
+        .fold(0_u32, |accum, bits| accum | bits);
+}
+
+lazy_static::lazy_static! {
+    /// All bits for ciphertext action types: 1 where a ciphertext action could have a bit, 0 elsewhere.
+    static ref ALL_CIPHERTEXT_ELEMENT_BITS: u32 = ActionType::iter()
+        .filter(|t| t.supports_flavor(PacketFlavorEnum::Ciphertext))
+        .map(|t| t.all_bits())
+        .fold(0_u32, |accum, bits| accum | bits);
+}
+
+impl<F: PacketFlavor> ActionBits<F> {
+    /// Tries to create ActionBits from a u32, returning error in the event a specific bit is set for
+    /// an unsupported flavor
+    pub fn try_from(value: u32) -> Result<Self, FlavorNotSupported> {
+        let ok_bits: u32 = match F::ENUM_VARIANT {
+            PacketFlavorEnum::Plaintext => *ALL_PLAINTEXT_ELEMENT_BITS,
+            PacketFlavorEnum::Ciphertext => *ALL_CIPHERTEXT_ELEMENT_BITS,
+        };
+
+        // no bits set beyond what's allowed for this flavor
+        if value | ok_bits == ok_bits {
+            Ok(Self { bits: value, flavor: marker::PhantomData })
+        } else {
+            Err(FlavorNotSupported { flavor: F::ENUM_VARIANT })
+        }
+    }
+
+    /// Set the bits for the provided element.
+    /// Bits outside the range set by the action will be unaffected.
+    pub fn set_action<E: ToActionElement<F>>(&mut self, to_element: E) {
+        let element = to_element.to_action_element();
+        let len = element.len.get();
+
+        // validate that the element is not horribly broken
+        debug_assert!(len + element.index <= 32);
+        // must not have bits set past the high `len` bits
+        debug_assert_eq!(0, element.bits >> (8 - len));
+
+        // 0-extend to u32
+        let byte_extended = element.bits as u32;
+        // Shift so that the high bit is at the desired index.
+        // Won't overflow since length > 0.
+        let bits_in_position = byte_extended << (32 - len - element.index);
+
+        // We want to effectively clear out the bits already in place, so we don't want to just |=.
+        // Instead, we construct a u32 with all 1s above and below the relevant bits and &=, so that
+        // if the new bits are 0, the stored bits will be cleared.
+
+        // avoid overflow when index = 0 -- need zero 1 bits to the left in that case
+        let left_1s = u32::MAX.checked_shl(32 - element.index).unwrap_or(0);
+        // avoid underflow when index + len = 32 -- zero 1 bits to the right
+        let right_1s = u32::MAX.checked_shr(element.index + len).unwrap_or(0);
+        let mask = left_1s | right_1s;
+        let bits_for_other_actions = self.bits & mask;
+        self.bits = bits_for_other_actions | bits_in_position;
+    }
+
+    /// How many bytes (1-3) are needed to represent the set bits, starting from the most
+    /// significant bit. The lower bound of 1 is because the unique special case of
+    /// an actions field of all zeroes is required by the spec to occupy exactly one byte.
+    pub(crate) fn bytes_used(&self) -> usize {
+        let bits_used = 32 - self.bits.trailing_zeros();
+        let raw_count = (bits_used as usize + 7) / 8;
+        if raw_count == 0 {
+            1 // Uncommon case - should only be hit for all-zero action bits
+        } else {
+            raw_count
+        }
+    }
+
+    /// Return the bits for a given action type as the low bits in the returned u32.
+    ///
+    /// For example, when extracting the bits `B` from `0bXXXXXXXXXXBBBBBBXXXXXXXXXXXXXXXX`, the
+    /// return value will be `0b00000000000000000000000000BBBBBB`.
+    pub fn bits_for_type(&self, action_type: &ActionType) -> u32 {
+        self.bits << action_type.high_bit_index() >> (32 - action_type.bits_len())
+    }
+}
+
+/// The encoded form of an individual action element.
+#[derive(Debug, Clone, Copy)]
+pub struct ActionElementBits<F: PacketFlavor> {
+    /// Offset from the high bit in `ActionBits.bits`, which would be bit 0 of byte 0 of the big-endian
+    /// representation.
+    /// Must leave enough room for `len` bits in a u32; that is, `index + len <= 32`.
+    index: u32,
+    /// Number of bits used.
+    /// `len + index <= 32` must be true.
+    len: num::NonZeroU32,
+    /// Returns the bits to set as the lower `len` bits of the byte.
+    bits: u8,
+    /// Marker for whether it can be used in plaintext or encrypted data elements.
+    flavor: marker::PhantomData<F>,
+}
+
+/// Core trait for an individual action
+pub trait ActionElement {
+    /// The offset from the high bit in the eventual bit sequence of all actions.
+    /// See [ActionElementBits.index].
+    ///
+    /// Each implementation must have a non-overlapping sequence of bits defined by
+    /// `HIGH_BIT_INDEX` and `BITS_LEN` w.r.t every other implementation.
+    const HIGH_BIT_INDEX: u32;
+    /// The number of high bits in a `u8` that should be used when assembling the complete
+    /// action bit vector.
+    ///
+    /// Must be >0.
+    const BITS_LEN: u32;
+    /// Forces implementations to have a matching enum variant so the enum can be kept up to date.
+    const ACTION_TYPE: ActionType;
+
+    /// Returns whether or not this action supports the provided `flavor`.
+    ///
+    /// Must match the implementations of [ToActionElement].
+    fn supports_flavor(flavor: PacketFlavorEnum) -> bool;
+
+    /// Returns true if the bits for this element are all zero, or if the flavor is supported.
+    fn action_is_supported_or_not_set(bits: u32, flavor: PacketFlavorEnum) -> bool {
+        let shifted = bits << Self::HIGH_BIT_INDEX;
+        let masked = shifted & (!(u32::MAX >> Self::BITS_LEN));
+
+        (masked == 0) || Self::supports_flavor(flavor)
+    }
+}
+
+/// An analog of `Into` tailored to converting structs modeling specific action elements into the
+/// representation needed by [ActionBits].
+pub trait ToActionElement<F: PacketFlavor>: ActionElement {
+    /// Convert the high-level representation of an element into the literal bits needed.
+    fn to_action_element(&self) -> ActionElementBits<F> {
+        ActionElementBits {
+            index: Self::HIGH_BIT_INDEX,
+            len: Self::BITS_LEN.try_into().expect("all elements must have nonzero len"),
+            bits: self.bits(),
+            flavor: marker::PhantomData,
+        }
+    }
+
+    /// Returns the bits that should be set starting at `Self::INDEX`.
+    ///
+    /// Must not have more than the low `len()` bits set.
+    fn bits(&self) -> u8;
+}
+
+/// Provides a way to iterate over all action types.
+#[derive(Clone, Copy, strum_macros::EnumIter, PartialEq, Eq, Hash, Debug)]
+#[allow(missing_docs)]
+pub enum ActionType {
+    ContextSyncSeqNum,
+    ActiveUnlock,
+    NearbyShare,
+    InstantTethering,
+    PhoneHub,
+    Finder,
+    FastPairSass,
+    PresenceManager,
+}
+
+impl ActionType {
+    /// A u32 with all possible bits for this action type set
+    const fn all_bits(&self) -> u32 {
+        (u32::MAX << (32_u32 - self.bits_len())) >> self.high_bit_index()
+    }
+
+    /// Get the range of the bits occupied used by this bit index. For example, if the action type
+    /// uses the 5th and 6th bits, the returned range will be (5..7).
+    /// (0 is the index of the most significant bit).
+    #[cfg(feature = "devtools")]
+    pub const fn bits_range_for_devtools(&self) -> Range<u32> {
+        let high_bit_index = self.high_bit_index();
+        high_bit_index..high_bit_index + self.bits_len()
+    }
+
+    const fn high_bit_index(&self) -> u32 {
+        match self {
+            ActionType::ContextSyncSeqNum => ContextSyncSeqNum::HIGH_BIT_INDEX,
+            ActionType::ActiveUnlock => ActiveUnlock::HIGH_BIT_INDEX,
+            ActionType::NearbyShare => NearbyShare::HIGH_BIT_INDEX,
+            ActionType::InstantTethering => InstantTethering::HIGH_BIT_INDEX,
+            ActionType::PhoneHub => PhoneHub::HIGH_BIT_INDEX,
+            ActionType::Finder => Finder::HIGH_BIT_INDEX,
+            ActionType::FastPairSass => FastPairSass::HIGH_BIT_INDEX,
+            ActionType::PresenceManager => PresenceManager::HIGH_BIT_INDEX,
+        }
+    }
+
+    const fn bits_len(&self) -> u32 {
+        match self {
+            ActionType::ContextSyncSeqNum => ContextSyncSeqNum::BITS_LEN,
+            ActionType::ActiveUnlock => ActiveUnlock::BITS_LEN,
+            ActionType::NearbyShare => NearbyShare::BITS_LEN,
+            ActionType::InstantTethering => InstantTethering::BITS_LEN,
+            ActionType::PhoneHub => PhoneHub::BITS_LEN,
+            ActionType::Finder => Finder::BITS_LEN,
+            ActionType::FastPairSass => FastPairSass::BITS_LEN,
+            ActionType::PresenceManager => PresenceManager::BITS_LEN,
+        }
+    }
+
+    pub(crate) fn supports_flavor(&self, flavor: PacketFlavorEnum) -> bool {
+        match self {
+            ActionType::ContextSyncSeqNum => ContextSyncSeqNum::supports_flavor(flavor),
+            ActionType::ActiveUnlock => ActiveUnlock::supports_flavor(flavor),
+            ActionType::NearbyShare => NearbyShare::supports_flavor(flavor),
+            ActionType::InstantTethering => InstantTethering::supports_flavor(flavor),
+            ActionType::PhoneHub => PhoneHub::supports_flavor(flavor),
+            ActionType::Finder => Finder::supports_flavor(flavor),
+            ActionType::FastPairSass => FastPairSass::supports_flavor(flavor),
+            ActionType::PresenceManager => PresenceManager::supports_flavor(flavor),
+        }
+    }
+}
+
+impl ActionElement for ContextSyncSeqNum {
+    const HIGH_BIT_INDEX: u32 = 0;
+    const BITS_LEN: u32 = 4;
+    const ACTION_TYPE: ActionType = ActionType::ContextSyncSeqNum;
+
+    fn supports_flavor(flavor: PacketFlavorEnum) -> bool {
+        match flavor {
+            PacketFlavorEnum::Plaintext => true,
+            PacketFlavorEnum::Ciphertext => true,
+        }
+    }
+}
+
+impl ToActionElement<Plaintext> for ContextSyncSeqNum {
+    fn bits(&self) -> u8 {
+        self.as_u8()
+    }
+}
+
+impl ToActionElement<Ciphertext> for ContextSyncSeqNum {
+    fn bits(&self) -> u8 {
+        self.as_u8()
+    }
+}
+
+// enabling an element for public adv requires privacy approval due to fingerprinting risk
+
+macros::boolean_element!(ActiveUnlock, 8, ciphertext_only);
+macros::boolean_element!(NearbyShare, 9, plaintext_and_ciphertext);
+macros::boolean_element!(InstantTethering, 10, ciphertext_only);
+macros::boolean_element!(PhoneHub, 11, ciphertext_only);
+macros::boolean_element!(PresenceManager, 12, ciphertext_only);
+macros::boolean_element!(Finder, 13, plaintext_only);
+macros::boolean_element!(FastPairSass, 14, plaintext_only);
diff --git a/nearby/presence/np_adv/src/legacy/actions/tests.rs b/nearby/presence/np_adv/src/legacy/actions/tests.rs
new file mode 100644
index 0000000..2e3fda0
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/actions/tests.rs
@@ -0,0 +1,378 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use crate::legacy::{
+    actions::*, serialize::ToDataElementBundle, Ciphertext, PacketFlavorEnum, Plaintext,
+};
+use std::collections;
+
+#[test]
+fn set_context_sync_works() {
+    let mut actions = ActionBits::<Plaintext>::default();
+
+    actions.set_action(ContextSyncSeqNum::try_from(15).unwrap());
+    assert_eq_hex(0xF0000000, actions.bits);
+
+    assert_eq!(actions.bits_for_type(&ActionType::ContextSyncSeqNum), 15);
+}
+
+#[test]
+fn set_context_sync_doesnt_clobber_neighboring_bit() {
+    let mut actions = ActionBits::<Plaintext>::default();
+
+    // set bit just below
+    actions.bits |= 0x8000000;
+
+    actions.set_action(ContextSyncSeqNum::try_from(15).unwrap());
+    assert_eq_hex(0xF8000000, actions.bits);
+
+    assert_eq!(actions.bits_for_type(&ActionType::ContextSyncSeqNum), 15);
+}
+
+#[test]
+fn unset_context_sync_works() {
+    let mut actions = ActionBits::<Plaintext> {
+        // all 1s
+        bits: u32::MAX,
+        ..Default::default()
+    };
+
+    actions.set_action(ContextSyncSeqNum::try_from(0).unwrap());
+    assert_eq_hex(0x0FFFFFFF, actions.bits);
+
+    assert_eq!(actions.bits_for_type(&ActionType::ContextSyncSeqNum), 0);
+}
+
+#[test]
+fn set_ns_works() {
+    let mut actions = ActionBits::<Plaintext>::default();
+
+    actions.set_action(NearbyShare::from(true));
+    assert_eq_hex(0x00400000, actions.bits);
+
+    assert_eq!(actions.bits_for_type(&ActionType::NearbyShare), 1);
+    assert_eq!(actions.bits_for_type(&ActionType::ActiveUnlock), 0);
+    assert_eq!(actions.bits_for_type(&ActionType::InstantTethering), 0);
+}
+
+#[test]
+fn set_ns_doesnt_clobber_others() {
+    let mut actions = ActionBits::<Plaintext>::default();
+
+    // set neighboring bits
+    actions.bits |= 0x00120000;
+
+    actions.set_action(NearbyShare::from(true));
+    assert_eq_hex(0x00520000, actions.bits);
+
+    assert_eq!(actions.bits_for_type(&ActionType::NearbyShare), 1);
+    assert_eq!(actions.bits_for_type(&ActionType::PhoneHub), 1);
+    assert_eq!(actions.bits_for_type(&ActionType::FastPairSass), 1);
+}
+
+#[test]
+fn unset_ns_works() {
+    let mut actions = ActionBits::<Plaintext> {
+        // all 1s
+        bits: u32::MAX,
+        ..Default::default()
+    };
+
+    actions.set_action(NearbyShare::from(false));
+    assert_eq_hex(0xFFBFFFFF, actions.bits);
+}
+
+#[test]
+fn set_last_bit_works() {
+    let mut actions = ActionBits::<Plaintext>::default();
+
+    actions.set_action(LastBit::from(true));
+    assert_eq_hex(0x0100, actions.bits);
+}
+
+#[test]
+fn set_last_bit_doesnt_clobber_others() {
+    let mut actions = ActionBits::<Plaintext>::default();
+
+    // set neighboring bits
+    actions.bits |= 0x200;
+
+    actions.set_action(LastBit::from(true));
+    assert_eq_hex(0x300, actions.bits);
+}
+
+#[test]
+fn unset_last_bit_works() {
+    let mut actions = ActionBits::<Plaintext> {
+        // all 1s
+        bits: u32::MAX,
+        ..Default::default()
+    };
+
+    actions.set_action(LastBit::from(false));
+    assert_eq_hex(0xFFFFFEFF, actions.bits);
+}
+
+#[test]
+fn bytes_used_works() {
+    let mut actions = ActionBits::<Plaintext>::default();
+
+    // Special-case: All-zeroes should lead to a single byte being used.
+    assert_eq!(1, actions.bytes_used());
+
+    actions.set_action(ContextSyncSeqNum::try_from(3).unwrap());
+    assert_eq!(1, actions.bytes_used());
+
+    actions.set_action(NearbyShare::from(true));
+    assert_eq!(2, actions.bytes_used());
+
+    actions.set_action(LastBit::from(true));
+    assert_eq!(3, actions.bytes_used());
+
+    actions.set_action(LastBit::from(false));
+    assert_eq!(2, actions.bytes_used());
+}
+
+#[test]
+fn write_de_empty_actions() {
+    // The special case of no action bits set should still occupy one byte [of all zeroes].
+    let de = ActionsDataElement::<Plaintext>::from(ActionBits::default()).to_de_bundle();
+
+    assert_eq!(&[0x00], de.contents_as_slice());
+}
+
+#[test]
+fn write_de_one_action_byte() {
+    let mut action = ActionBits::default();
+    action.set_action(ContextSyncSeqNum::try_from(7).unwrap());
+    let de = ActionsDataElement::<Plaintext>::from(action).to_de_bundle();
+
+    assert_eq!(&[0x70], de.contents_as_slice());
+}
+
+#[test]
+fn write_de_three_action_bytes() {
+    let mut action = ActionBits::default();
+    action.set_action(LastBit::from(true));
+    let de = ActionsDataElement::<Plaintext>::from(action).to_de_bundle();
+
+    assert_eq!(&[0, 0, 1], de.contents_as_slice());
+}
+
+#[test]
+fn write_de_all_plaintext_actions() {
+    let mut action = all_plaintext_actions();
+    action.set_action(LastBit::from(true));
+    let de = ActionsDataElement::<Plaintext>::from(action).to_de_bundle();
+
+    // byte 0: context sync
+    // byte 1: nearby share, finder, fp sass
+    // byte 2: last bit
+    assert_eq!(&[0x90, 0x46, 0x01], de.contents_as_slice());
+}
+
+#[test]
+fn write_de_all_encrypted_actions() {
+    let mut action = all_ciphertext_actions();
+    action.set_action(LastBit::from(true));
+    let de = ActionsDataElement::<Ciphertext>::from(action).to_de_bundle();
+
+    // byte 1: context sync num = 9, 4 unused bits
+    // byte 2: active unlock, nearby share, instant tethering, phone hub,
+    // presence manager, last 3 bits unused
+    // byte 3: last bit
+    assert_eq!(&[0x90, 0xF8, 0x01], de.contents_as_slice());
+}
+
+#[test]
+fn action_element_nonzero_len() {
+    for t in ActionType::iter() {
+        assert!(t.bits_len() > 0);
+    }
+}
+
+#[test]
+fn action_element_bits_dont_overlap() {
+    let type_to_bits =
+        ActionType::iter().map(|t| (t, t.all_bits())).collect::<collections::HashMap<_, _>>();
+
+    for t in ActionType::iter() {
+        let bits = type_to_bits.get(&t).unwrap();
+
+        for (_, other_bits) in type_to_bits.iter().filter(|(other_type, _)| t != **other_type) {
+            assert_eq!(0, bits & other_bits, "type {t:?}");
+        }
+    }
+}
+
+#[test]
+fn action_type_all_bits() {
+    assert_eq!(0xF0000000, ActionType::ContextSyncSeqNum.all_bits());
+    assert_eq!(0x00800000, ActionType::ActiveUnlock.all_bits());
+    assert_eq!(0x00020000, ActionType::FastPairSass.all_bits());
+}
+
+#[test]
+fn action_type_all_bits_in_per_type_masks() {
+    for t in ActionType::iter().filter(|t| t.supports_flavor(PacketFlavorEnum::Plaintext)) {
+        assert_eq!(t.all_bits(), t.all_bits() & *ALL_PLAINTEXT_ELEMENT_BITS);
+    }
+    for t in ActionType::iter().filter(|t| t.supports_flavor(PacketFlavorEnum::Ciphertext)) {
+        assert_eq!(t.all_bits(), t.all_bits() & *ALL_CIPHERTEXT_ELEMENT_BITS);
+    }
+}
+
+#[test]
+fn action_bits_try_from_flavor_mismatch_plaintext() {
+    assert_eq!(
+        FlavorNotSupported { flavor: PacketFlavorEnum::Plaintext },
+        ActionBits::<Plaintext>::try_from(ActionType::PresenceManager.all_bits()).unwrap_err()
+    );
+    assert_eq!(
+        0xF0000000,
+        ActionBits::<Plaintext>::try_from(ActionType::ContextSyncSeqNum.all_bits()).unwrap().bits
+    );
+}
+
+#[test]
+fn action_bits_try_from_flavor_mismatch_ciphertext() {
+    assert_eq!(
+        FlavorNotSupported { flavor: PacketFlavorEnum::Ciphertext },
+        ActionBits::<Ciphertext>::try_from(ActionType::Finder.all_bits()).unwrap_err()
+    );
+    assert_eq!(
+        0xF0000000,
+        ActionBits::<Ciphertext>::try_from(ActionType::ContextSyncSeqNum.all_bits()).unwrap().bits
+    );
+}
+
+#[test]
+fn actions_de_deser_plaintext_with_ciphertext_action() {
+    assert_eq!(
+        DataElementDeserializeError::FlavorNotSupported {
+            de_type: DataElementType::Actions,
+            flavor: PacketFlavorEnum::Plaintext
+        },
+        <ActionsDataElement<Plaintext> as DataElement>::deserialize::<Plaintext>(&[
+            // active unlock bit set
+            0x00, 0x80, 0x00,
+        ])
+        .unwrap_err()
+    );
+}
+
+#[test]
+fn actions_de_deser_ciphertext_with_plaintext_action() {
+    assert_eq!(
+        DataElementDeserializeError::FlavorNotSupported {
+            de_type: DataElementType::Actions,
+            flavor: PacketFlavorEnum::Ciphertext
+        },
+        <ActionsDataElement<Ciphertext> as DataElement>::deserialize::<Ciphertext>(&[
+            // Finder bit set
+            0x00, 0x00, 0x80,
+        ])
+        .unwrap_err()
+    );
+}
+
+#[test]
+fn context_sync_seq_num_works() {
+    let mut action_bits = ActionBits::<Plaintext>::default();
+    action_bits.set_action(ContextSyncSeqNum::try_from(15).unwrap());
+    let action_de = ActionsDataElement::from(action_bits);
+    assert_eq!(15, action_de.context_sync_seq_num().as_u8());
+}
+
+#[test]
+fn context_sync_seq_num_default_zero() {
+    let action_bits = ActionBits::<Plaintext>::default();
+    let action_de = ActionsDataElement::from(action_bits);
+    assert_eq!(0, action_de.context_sync_seq_num().as_u8());
+}
+
+#[test]
+fn has_action_plaintext_works() {
+    let mut action_bits = ActionBits::<Plaintext>::default();
+    action_bits.set_action(ContextSyncSeqNum::try_from(15).unwrap());
+    action_bits.set_action(NearbyShare::from(true));
+    let action_de = ActionsDataElement::from(action_bits);
+    assert_eq!(action_de.has_action(&ActionType::NearbyShare), Some(true));
+    assert_eq!(action_de.has_action(&ActionType::ActiveUnlock), Some(false));
+    assert_eq!(action_de.has_action(&ActionType::PhoneHub), Some(false));
+}
+
+#[test]
+fn has_action_encrypted_works() {
+    let mut action_bits = ActionBits::<Ciphertext>::default();
+    action_bits.set_action(ContextSyncSeqNum::try_from(15).unwrap());
+    action_bits.set_action(NearbyShare::from(true));
+    action_bits.set_action(ActiveUnlock::from(true));
+    let action_de = ActionsDataElement::from(action_bits);
+    assert_eq!(action_de.has_action(&ActionType::NearbyShare), Some(true));
+    assert_eq!(action_de.has_action(&ActionType::ActiveUnlock), Some(true));
+    assert_eq!(action_de.has_action(&ActionType::PhoneHub), Some(false));
+    assert_eq!(action_de.has_action(&ActionType::ContextSyncSeqNum), None);
+}
+
+// hypothetical action using the last bit
+#[derive(Debug)]
+struct LastBit {
+    enabled: bool,
+}
+impl From<bool> for LastBit {
+    fn from(value: bool) -> Self {
+        LastBit { enabled: value }
+    }
+}
+impl ActionElement for LastBit {
+    const HIGH_BIT_INDEX: u32 = 23;
+    const BITS_LEN: u32 = 1;
+
+    // don't want to add a variant for this test only type
+    const ACTION_TYPE: ActionType = ActionType::ActiveUnlock;
+
+    fn supports_flavor(_flavor: PacketFlavorEnum) -> bool {
+        true
+    }
+}
+
+macros::boolean_element_to_plaintext_element!(LastBit);
+macros::boolean_element_to_encrypted_element!(LastBit);
+
+fn assert_eq_hex(expected: u32, actual: u32) {
+    assert_eq!(expected, actual, "{expected:#010X} != {actual:#010X}");
+}
+
+pub(crate) fn all_plaintext_actions() -> ActionBits<Plaintext> {
+    let mut action = ActionBits::default();
+    action.set_action(ContextSyncSeqNum::try_from(9).unwrap());
+    action.set_action(NearbyShare::from(true));
+    action.set_action(Finder::from(true));
+    action.set_action(FastPairSass::from(true));
+    action
+}
+
+pub(crate) fn all_ciphertext_actions() -> ActionBits<Ciphertext> {
+    let mut action = ActionBits::default();
+    action.set_action(ContextSyncSeqNum::try_from(9).unwrap());
+    action.set_action(ActiveUnlock::from(true));
+    action.set_action(NearbyShare::from(true));
+    action.set_action(InstantTethering::from(true));
+    action.set_action(PhoneHub::from(true));
+    action.set_action(PresenceManager::from(true));
+    action
+}
diff --git a/nearby/presence/np_adv/src/legacy/data_elements.rs b/nearby/presence/np_adv/src/legacy/data_elements.rs
new file mode 100644
index 0000000..e9c2308
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/data_elements.rs
@@ -0,0 +1,109 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! V0 data elements and core trait impls.
+use crate::legacy::{
+    de_type::{DataElementType, PlainDataElementType},
+    serialize::{DataElementBundle, ToDataElementBundle},
+    PacketFlavor, PacketFlavorEnum,
+};
+use crate::shared_data::*;
+
+/// Core behavior for data elements.
+///
+/// See also [ToDataElementBundle] for flavor-specific, infallible serialization.
+pub trait DataElement: Sized {
+    /// The corresponding DataElementType variant.
+    const DE_TYPE_VARIANT: DataElementType;
+
+    /// Return true if the DE supports serialization and deserialization for the provided flavor.
+    fn supports_flavor(flavor: PacketFlavorEnum) -> bool;
+
+    /// Returns `Err` if the flavor is not supported or if parsing fails.
+    ///
+    /// `<F>` is the flavor of the packet being deserialized.
+    fn deserialize<F: PacketFlavor>(
+        de_contents: &[u8],
+    ) -> Result<Self, DataElementDeserializeError>;
+}
+
+/// Errors possible when deserializing a DE
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum DataElementDeserializeError {
+    /// The data element doesn't support the [PacketFlavor] of the advertisement packet.
+    FlavorNotSupported {
+        /// The DE type attempting to be deserialized
+        de_type: DataElementType,
+        /// The flavor that was not supported
+        flavor: PacketFlavorEnum,
+    },
+    /// The data element couldn't be deserialized from the supplied data.
+    DeserializeError {
+        /// The DE type attempting to be deserialized
+        de_type: DataElementType,
+    },
+}
+
+/// Data element holding a [TxPower].
+#[derive(Debug, PartialEq, Eq)]
+pub struct TxPowerDataElement {
+    tx_power: TxPower,
+}
+
+impl TxPowerDataElement {
+    /// Gets the underlying Tx Power value
+    pub fn tx_power_value(&self) -> i8 {
+        self.tx_power.as_i8()
+    }
+}
+
+impl From<TxPower> for TxPowerDataElement {
+    fn from(tx_power: TxPower) -> Self {
+        Self { tx_power }
+    }
+}
+
+impl<F: PacketFlavor> ToDataElementBundle<F> for TxPowerDataElement {
+    fn to_de_bundle(&self) -> DataElementBundle<F> {
+        let tx_power = self.tx_power.as_i8();
+        DataElementBundle::try_from(
+            PlainDataElementType::TxPower,
+            tx_power.to_be_bytes().as_slice(),
+        )
+        .expect("Length < max DE size")
+    }
+}
+
+impl DataElement for TxPowerDataElement {
+    const DE_TYPE_VARIANT: DataElementType = DataElementType::TxPower;
+
+    fn supports_flavor(flavor: PacketFlavorEnum) -> bool {
+        match flavor {
+            PacketFlavorEnum::Plaintext => true,
+            PacketFlavorEnum::Ciphertext => true,
+        }
+    }
+    fn deserialize<F: PacketFlavor>(
+        de_contents: &[u8],
+    ) -> Result<Self, DataElementDeserializeError> {
+        de_contents
+            .try_into()
+            .ok()
+            .and_then(|arr: [u8; 1]| TxPower::try_from(i8::from_be_bytes(arr)).ok())
+            .map(|tx_power| Self { tx_power })
+            .ok_or(DataElementDeserializeError::DeserializeError {
+                de_type: DataElementType::TxPower,
+            })
+    }
+}
diff --git a/nearby/presence/np_adv/src/legacy/de_type/mod.rs b/nearby/presence/np_adv/src/legacy/de_type/mod.rs
new file mode 100644
index 0000000..5c7ebfa
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/de_type/mod.rs
@@ -0,0 +1,355 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! V0 data element types.
+//!
+//! In V0, there are only 16 DE types total, and parsing unknown types is not possible, so we can
+//! represent all known DE types in enums without needing to handle the "unknown type" case.
+
+use crate::{
+    de_type::IdentityDataElementType,
+    legacy::{
+        actions::ActionsDataElement,
+        data_elements::{DataElement as _, TxPowerDataElement},
+        Ciphertext, PacketFlavorEnum, Plaintext, NP_MAX_DE_CONTENT_LEN,
+    },
+    DeLengthOutOfRange,
+};
+use core::ops;
+use ldt_np_adv::NP_LEGACY_METADATA_KEY_LEN;
+use strum_macros::EnumIter;
+
+#[cfg(test)]
+mod tests;
+
+/// A V0 DE type in `[0, 15]`.
+#[derive(Debug, PartialEq, Eq, Hash)]
+pub(crate) struct DeTypeCode {
+    /// The code used in a V0 adv header
+    code: u8,
+}
+
+impl DeTypeCode {
+    /// Returns a u8 in `[0, 15`].
+    pub(crate) fn as_u8(&self) -> u8 {
+        self.code
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub(crate) struct DeTypeCodeOutOfRange;
+
+impl TryFrom<u8> for DeTypeCode {
+    type Error = DeTypeCodeOutOfRange;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        if value < 16 {
+            Ok(Self { code: value })
+        } else {
+            Err(DeTypeCodeOutOfRange)
+        }
+    }
+}
+
+/// The actual length of a DE, not the encoded representation.
+///
+/// See [DeEncodedLength] for the encoded length.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub(crate) struct DeActualLength {
+    /// Invariant: <= `NP_MAX_DE_CONTENT_LEN`.
+    len: u8,
+}
+
+impl DeActualLength {
+    pub(crate) const ZERO: DeActualLength = DeActualLength { len: 0 };
+
+    pub(crate) fn as_usize(&self) -> usize {
+        self.len as usize
+    }
+}
+
+impl TryFrom<u8> for DeActualLength {
+    type Error = DeLengthOutOfRange;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        if (value as usize) <= NP_MAX_DE_CONTENT_LEN {
+            Ok(Self { len: value })
+        } else {
+            Err(DeLengthOutOfRange)
+        }
+    }
+}
+
+impl TryFrom<usize> for DeActualLength {
+    type Error = DeLengthOutOfRange;
+
+    fn try_from(value: usize) -> Result<Self, Self::Error> {
+        if value <= NP_MAX_DE_CONTENT_LEN {
+            Ok(Self { len: value as u8 })
+        } else {
+            Err(DeLengthOutOfRange)
+        }
+    }
+}
+
+/// The encoded length of a DE, not the actual length of the DE contents.
+///
+/// See [DeActualLength] for the length of the contents.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub(crate) struct DeEncodedLength {
+    /// Invariant: `len <= 0x0F` (15, aka 4 bits)
+    len: u8,
+}
+
+impl DeEncodedLength {
+    /// Returns a u8 in `[0, 15]`
+    pub(crate) fn as_u8(&self) -> u8 {
+        self.len
+    }
+
+    /// Returns a usize in `[0, 15]`
+    pub(crate) fn as_usize(&self) -> usize {
+        self.len as usize
+    }
+}
+
+impl TryFrom<u8> for DeEncodedLength {
+    type Error = DeLengthOutOfRange;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        if value < 16 {
+            Ok(Self { len: value })
+        } else {
+            Err(DeLengthOutOfRange)
+        }
+    }
+}
+
+/// DE types for normal DEs (not an identity).
+///
+/// May be contained in identity DEs (see [IdentityDataElementType]). Must not overlap with
+/// [IdentityDataElementType].
+#[derive(EnumIter, Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) enum PlainDataElementType {
+    TxPower,
+    Actions,
+}
+
+impl PlainDataElementType {
+    pub(crate) fn as_generic_de_type(&self) -> DataElementType {
+        match self {
+            PlainDataElementType::TxPower => DataElementType::TxPower,
+            PlainDataElementType::Actions => DataElementType::Actions,
+        }
+    }
+
+    pub(crate) fn supports_flavor(&self, flavor: PacketFlavorEnum) -> bool {
+        match self {
+            PlainDataElementType::Actions => {
+                // Actions is effectively two different DEs based on which actions it can
+                // contain, so we have to check them separately. The Plaintext one obviously
+                // supports plaintext, and vice versa, so we could just say `true` here, but we
+                // spell it out to be consistent with the other DE types.
+                match flavor {
+                    PacketFlavorEnum::Plaintext => {
+                        ActionsDataElement::<Plaintext>::supports_flavor(flavor)
+                    }
+                    PacketFlavorEnum::Ciphertext => {
+                        ActionsDataElement::<Ciphertext>::supports_flavor(flavor)
+                    }
+                }
+            }
+            PlainDataElementType::TxPower => TxPowerDataElement::supports_flavor(flavor),
+        }
+    }
+}
+
+/// Corresponds to the different implementations of [DataElement].
+///
+/// It's intended for use cases that don't care if a DE is a plain or identity DE. Every variant
+/// corresponds to either a [PlainDataElementType] or a [IdentityDataElementType].
+#[derive(EnumIter, Debug, Clone, Copy, PartialEq, Eq)]
+#[allow(missing_docs)]
+#[doc(hidden)]
+pub enum DataElementType {
+    PrivateIdentity,
+    TrustedIdentity,
+    PublicIdentity,
+    ProvisionedIdentity,
+    TxPower,
+    Actions,
+}
+
+const DE_TYPES_BY_CODE: [Option<DataElementType>; 16] = [
+    None,                                       // 0b0000
+    Some(DataElementType::PrivateIdentity),     // 0b0001
+    Some(DataElementType::TrustedIdentity),     // 0b0010
+    Some(DataElementType::PublicIdentity),      // 0b0011
+    Some(DataElementType::ProvisionedIdentity), // 0b0100
+    Some(DataElementType::TxPower),             // 0b0101
+    Some(DataElementType::Actions),             // 0b0110
+    None,                                       // 0b0111
+    None,                                       // 0b1000
+    None,                                       // 0b1001
+    None,                                       // 0b1010
+    None,                                       // 0b1011
+    None,                                       // 0b1100
+    None,                                       // 0b1101
+    None,                                       // 0b1110
+    None,                                       // 0b1111
+];
+
+impl DataElementType {
+    /// Salt + key + at least 2 bytes of DE to make LDT ciphertext min length
+    const VALID_ENCRYPTED_IDENTITY_DE_ACTUAL_LEN: ops::RangeInclusive<usize> =
+        (2 + NP_LEGACY_METADATA_KEY_LEN + 2..=NP_MAX_DE_CONTENT_LEN);
+    const VALID_ENCRYPTED_IDENTITY_DE_HEADER_LEN: ops::RangeInclusive<usize> = (2..=6);
+
+    /// If there is a corresponding [ContainerDataElementType], returns it, otherwise None.
+    pub(crate) fn try_as_identity_de_type(&self) -> Option<IdentityDataElementType> {
+        match self {
+            DataElementType::PrivateIdentity => Some(IdentityDataElementType::Private),
+            DataElementType::TrustedIdentity => Some(IdentityDataElementType::Trusted),
+            DataElementType::PublicIdentity => Some(IdentityDataElementType::Public),
+            DataElementType::ProvisionedIdentity => Some(IdentityDataElementType::Provisioned),
+            DataElementType::TxPower | DataElementType::Actions => None,
+        }
+    }
+
+    /// If there is a corresponding [PlainDataElementType], returns it, otherwise None.
+    pub(crate) fn try_as_plain_de_type(&self) -> Option<PlainDataElementType> {
+        match self {
+            DataElementType::TxPower => Some(PlainDataElementType::TxPower),
+            DataElementType::Actions => Some(PlainDataElementType::Actions),
+            DataElementType::PrivateIdentity
+            | DataElementType::TrustedIdentity
+            | DataElementType::PublicIdentity
+            | DataElementType::ProvisionedIdentity => None,
+        }
+    }
+
+    /// Returns the matching type for the code, else `None`
+    pub(crate) fn from_type_code(de_type: DeTypeCode) -> Option<Self> {
+        DE_TYPES_BY_CODE.get(de_type.as_u8() as usize).and_then(|o| *o)
+    }
+
+    /// A type code in `[0,15]` for use in the high bits of the DE header byte.
+    pub(crate) fn type_code(&self) -> DeTypeCode {
+        match self {
+            DataElementType::PrivateIdentity => IdentityDataElementType::Private.shared_type_code(),
+            DataElementType::TrustedIdentity => IdentityDataElementType::Trusted.shared_type_code(),
+            DataElementType::PublicIdentity => IdentityDataElementType::Public.shared_type_code(),
+            DataElementType::ProvisionedIdentity => {
+                IdentityDataElementType::Provisioned.shared_type_code()
+            }
+            DataElementType::TxPower => 0b0101,
+            DataElementType::Actions => 0b0110,
+        }
+        .try_into()
+        .expect("hardcoded type codes are valid")
+    }
+
+    /// Convert the actual DE length to the encoded length included in the header.
+    ///
+    /// Returns `Err` if the actual length is invalid for the type, or the corresponding encoded length is out of range.
+    pub(crate) fn encoded_len_for_actual_len(
+        &self,
+        actual_len: DeActualLength,
+    ) -> Result<DeEncodedLength, DeLengthOutOfRange> {
+        match self {
+            // TODO 0-length provisioned
+            DataElementType::PrivateIdentity
+            | DataElementType::TrustedIdentity
+            | DataElementType::ProvisionedIdentity => {
+                if !Self::VALID_ENCRYPTED_IDENTITY_DE_ACTUAL_LEN.contains(&actual_len.as_usize()) {
+                    Err(DeLengthOutOfRange)
+                } else {
+                    actual_len
+                        .len
+                        .checked_sub(16)
+                        .ok_or(DeLengthOutOfRange)
+                        .and_then(|n| n.try_into())
+                }
+            }
+            DataElementType::PublicIdentity => {
+                if actual_len.len != 0 {
+                    Err(DeLengthOutOfRange)
+                } else {
+                    actual_len.len.try_into()
+                }
+            }
+            DataElementType::TxPower => {
+                if actual_len.len != 1 {
+                    Err(DeLengthOutOfRange)
+                } else {
+                    actual_len.len.try_into()
+                }
+            }
+            DataElementType::Actions => {
+                // doesn't matter which variant is used
+                if !ActionsDataElement::<Plaintext>::ACTIONS_LEN.contains(&actual_len.as_usize()) {
+                    Err(DeLengthOutOfRange)
+                } else {
+                    actual_len.len.try_into()
+                }
+            }
+        }
+    }
+
+    /// Convert the length in the header to the actual DE length.
+    ///
+    /// Returns `Err` if the encoded length is invalid for the type, or the corresponding actual length is out of range.
+    pub(crate) fn actual_len_for_encoded_len(
+        &self,
+        header_len: DeEncodedLength,
+    ) -> Result<DeActualLength, DeLengthOutOfRange> {
+        match self {
+            DataElementType::PrivateIdentity
+            | DataElementType::TrustedIdentity
+            // TODO provisioned 0 length
+            | DataElementType::ProvisionedIdentity => {
+                if !Self::VALID_ENCRYPTED_IDENTITY_DE_HEADER_LEN.contains(&header_len.as_usize()) {
+                    Err(DeLengthOutOfRange)
+                } else {
+                    header_len
+                        .len
+                        .checked_add(16)
+                        .ok_or(DeLengthOutOfRange)
+                        .and_then(|n| n.try_into())
+                }
+            }
+            DataElementType::PublicIdentity => {
+                if header_len.len != 0 {
+                    Err(DeLengthOutOfRange)
+                } else {
+                    header_len.len.try_into()
+                }
+            }
+            DataElementType::TxPower => {
+                if header_len.len != 1 {
+                    Err(DeLengthOutOfRange)
+                } else {
+                    header_len.len.try_into()
+                }
+            }
+            DataElementType::Actions => {
+                if !ActionsDataElement::<Plaintext>::ACTIONS_LEN.contains(&header_len.as_usize()) {
+                    Err(DeLengthOutOfRange)
+                } else {
+                    header_len.len.try_into()
+                }
+            }
+        }
+    }
+}
diff --git a/nearby/presence/np_adv/src/legacy/de_type/tests.rs b/nearby/presence/np_adv/src/legacy/de_type/tests.rs
new file mode 100644
index 0000000..59075aa
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/de_type/tests.rs
@@ -0,0 +1,112 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use super::*;
+use crate::legacy::serialize::id_de_type_as_generic_de_type;
+use std::{collections, vec::Vec};
+use strum::IntoEnumIterator as _;
+
+#[test]
+fn no_plain_vs_identity_type_overlap() {
+    let plain_types =
+        PlainDataElementType::iter().map(|t| t.as_generic_de_type()).collect::<Vec<_>>();
+    let identity_types =
+        IdentityDataElementType::iter().map(id_de_type_as_generic_de_type).collect::<Vec<_>>();
+
+    for plain_de_type in plain_types.iter() {
+        assert!(!identity_types.iter().any(|i| i == plain_de_type));
+        assert_eq!(None, plain_de_type.try_as_identity_de_type());
+    }
+
+    for id_de_type in identity_types.iter() {
+        assert!(!plain_types.iter().any(|p| p == id_de_type));
+        assert_eq!(None, id_de_type.try_as_plain_de_type());
+    }
+}
+
+#[test]
+fn generic_type_is_either_plain_or_identity() {
+    let generic_types = DataElementType::iter().collect::<Vec<_>>();
+
+    for g in generic_types.iter() {
+        let total = g.try_as_identity_de_type().map(|_| 1).unwrap_or(0)
+            + g.try_as_plain_de_type().map(|_| 1).unwrap_or(0);
+
+        assert_eq!(1, total);
+    }
+}
+
+#[test]
+fn generic_de_type_codes_are_consistent() {
+    for det in DataElementType::iter() {
+        let actual = DataElementType::from_type_code(det.type_code());
+        assert_eq!(Some(det), actual)
+    }
+}
+
+#[test]
+fn generic_de_distinct_type_codes() {
+    let codes =
+        DataElementType::iter().map(|det| det.type_code()).collect::<collections::HashSet<_>>();
+    assert_eq!(codes.len(), DataElementType::iter().count());
+}
+
+#[test]
+fn generic_de_no_accidentally_mapped_type_codes() {
+    let codes =
+        DataElementType::iter().map(|det| det.type_code()).collect::<collections::HashSet<_>>();
+    for possible_code in 0..=15 {
+        if codes.contains(&possible_code.try_into().unwrap()) {
+            continue;
+        }
+
+        assert_eq!(None, DataElementType::from_type_code(possible_code.try_into().unwrap()));
+    }
+}
+
+#[test]
+fn actions_de_length_zero_rejected() {
+    let encoded = DeEncodedLength::try_from(0).unwrap();
+    let maybe_actual_len = DataElementType::Actions.actual_len_for_encoded_len(encoded);
+    assert_eq!(Err(DeLengthOutOfRange), maybe_actual_len);
+}
+
+#[test]
+fn de_length_actual_encoded_round_trip() {
+    for de_type in DataElementType::iter() {
+        // for all possible lengths, calculate actual -> encoded and the inverse
+        let actual_to_encoded = (0_u8..=255)
+            .filter_map(|num| num.try_into().ok())
+            .filter_map(|actual: DeActualLength| {
+                de_type.encoded_len_for_actual_len(actual).ok().map(|encoded| (actual, encoded))
+            })
+            .collect::<collections::HashMap<_, _>>();
+
+        let encoded_to_actual = (0_u8..=255)
+            .filter_map(|num| num.try_into().ok())
+            .filter_map(|encoded: DeEncodedLength| {
+                de_type.actual_len_for_encoded_len(encoded).ok().map(|actual| (encoded, actual))
+            })
+            .collect::<collections::HashMap<_, _>>();
+
+        // ensure the two maps are inverses of each other
+        assert_eq!(
+            actual_to_encoded,
+            encoded_to_actual.into_iter().map(|(encoded, actual)| (actual, encoded)).collect(),
+            "de type: {de_type:?}"
+        );
+    }
+}
diff --git a/nearby/presence/np_adv/src/legacy/deserialize/mod.rs b/nearby/presence/np_adv/src/legacy/deserialize/mod.rs
new file mode 100644
index 0000000..3119f48
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/deserialize/mod.rs
@@ -0,0 +1,416 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! V0 data element deserialization.
+//!
+//! This module only deals with the _contents_ of an advertisement, not the advertisement header.
+
+extern crate alloc;
+
+use crate::{
+    de_type::EncryptedIdentityDataElementType,
+    legacy::{
+        actions,
+        data_elements::{DataElement, *},
+        de_type::{DataElementType, DeEncodedLength, DeTypeCode, PlainDataElementType},
+        Ciphertext, PacketFlavor, Plaintext, NP_MAX_DE_CONTENT_LEN,
+    },
+    PlaintextIdentityMode,
+};
+use alloc::vec::Vec;
+use crypto_provider::CryptoProvider;
+use ldt_np_adv::{LegacySalt, NP_LEGACY_METADATA_KEY_LEN};
+use nom::{bytes, combinator, multi, number, sequence};
+
+#[cfg(test)]
+mod tests;
+
+/// Deserialize an advertisement into data elements (if plaintext) or an identity type and
+/// ciphertext.
+pub(crate) fn deserialize_adv_contents<C: CryptoProvider>(
+    input: &[u8],
+) -> Result<IntermediateAdvContents, AdvDeserializeError> {
+    parse_raw_adv_contents::<C>(input).and_then(|raw_adv| match raw_adv {
+        RawAdvertisement::Plaintext(parc) => parc
+            .try_deserialize()
+            .map(IntermediateAdvContents::Plaintext)
+            .map_err(AdvDeserializeError::DataElementDeserializeError),
+        RawAdvertisement::Ciphertext(eac) => Ok(IntermediateAdvContents::Ciphertext(eac)),
+    })
+}
+
+/// Parse an advertisement's contents to the level of raw data elements (i.e no decryption,
+/// no per-type deserialization, etc).
+///
+/// Consumes the entire input.
+fn parse_raw_adv_contents<C: CryptoProvider>(
+    input: &[u8],
+) -> Result<RawAdvertisement, AdvDeserializeError> {
+    let (_, data_elements) = parse_data_elements(input)
+        .map_err(|_e| AdvDeserializeError::AdvertisementDeserializeError)?;
+
+    if let Some(identity_de_type) =
+        data_elements.first().and_then(|de| de.de_type.try_as_identity_de_type())
+    {
+        match identity_de_type.as_encrypted_identity_de_type() {
+            Some(encrypted_de_type) => {
+                if data_elements.len() == 1 {
+                    match encrypted_de_type {
+                        // TODO handle length=0 provisioned identity DEs
+                        EncryptedIdentityDataElementType::Private
+                        | EncryptedIdentityDataElementType::Trusted
+                        | EncryptedIdentityDataElementType::Provisioned => {
+                            combinator::map(
+                                parse_encrypted_identity_de_contents,
+                                |(salt, payload)| {
+                                    RawAdvertisement::Ciphertext(EncryptedAdvContents {
+                                        identity_type: encrypted_de_type,
+                                        salt_padder: ldt_np_adv::salt_padder::<16, C>(salt),
+                                        salt,
+                                        ciphertext: payload,
+                                    })
+                                },
+                            )(data_elements[0].contents)
+                            .map(|(_rem, contents)| contents)
+                            .map_err(|_e| AdvDeserializeError::AdvertisementDeserializeError)
+                        }
+                    }
+                } else {
+                    Err(AdvDeserializeError::TooManyTopLevelDataElements)
+                }
+            }
+            // It's an identity de, but not encrypted, so it must be public, and the rest must be
+            // plain
+            None => plain_data_elements(&data_elements[1..]).map(|pdes| {
+                RawAdvertisement::Plaintext(PlaintextAdvRawContents {
+                    identity_type: PlaintextIdentityMode::Public,
+                    data_elements: pdes,
+                })
+            }),
+        }
+    } else {
+        plain_data_elements(&data_elements).map(|pde| {
+            RawAdvertisement::Plaintext(PlaintextAdvRawContents {
+                identity_type: PlaintextIdentityMode::None,
+                data_elements: pde,
+            })
+        })
+    }
+}
+
+/// Legacy advertisement parsing errors
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) enum AdvDeserializeError {
+    /// Parsing the overall advertisement or DE structure failed
+    AdvertisementDeserializeError,
+    /// Deserializing an individual DE from its DE contents failed
+    DataElementDeserializeError(DataElementDeserializeError),
+    /// Must not have any other top level data elements if there is an encrypted identity DE
+    TooManyTopLevelDataElements,
+    /// Must not have an identity DE inside an identity DE
+    InvalidDataElementHierarchy,
+}
+
+/// Parse an advertisement's contents into raw DEs.
+///
+/// Consumes the entire input.
+fn parse_data_elements(adv_contents: &[u8]) -> nom::IResult<&[u8], Vec<RawDataElement>> {
+    combinator::all_consuming(multi::many0(parse_de))(adv_contents)
+}
+
+/// Parse an individual DE into its header and contents.
+fn parse_de(input: &[u8]) -> nom::IResult<&[u8], RawDataElement> {
+    let (remaining, (de_type, actual_len)) =
+        combinator::map_opt(number::complete::u8, |de_header| {
+            // header: LLLLTTTT
+            let len = de_header >> 4;
+            let de_type = de_header & 0x0F;
+            DeTypeCode::try_from(de_type).ok().and_then(DataElementType::from_type_code).and_then(
+                |de_type| {
+                    len.try_into()
+                        .ok()
+                        .and_then(|len: DeEncodedLength| {
+                            de_type.actual_len_for_encoded_len(len).ok()
+                        })
+                        .map(|len| (de_type, len))
+                },
+            )
+        })(input)?;
+
+    combinator::map(bytes::complete::take(actual_len.as_usize()), move |contents| RawDataElement {
+        de_type,
+        contents,
+    })(remaining)
+}
+
+/// Returns `Err`` if any DEs are not of a plain DE type.
+fn plain_data_elements<'d, D: AsRef<[RawDataElement<'d>]>>(
+    data_elements: D,
+) -> Result<Vec<RawPlainDataElement<'d>>, AdvDeserializeError> {
+    data_elements
+        .as_ref()
+        .iter()
+        .map(|de| {
+            de.de_type
+                .try_as_plain_de_type()
+                .map(|de_type| RawPlainDataElement { de_type, contents: de.contents })
+        })
+        .collect::<Option<Vec<_>>>()
+        .ok_or(AdvDeserializeError::InvalidDataElementHierarchy)
+}
+
+/// Parse legacy encrypted identity DEs (private, trusted, provisioned) into salt and ciphertext
+/// (encrypted metadata key and at least 2 bytes of DEs).
+///
+/// Consumes the entire input.
+fn parse_encrypted_identity_de_contents(
+    de_contents: &[u8],
+) -> nom::IResult<&[u8], (ldt_np_adv::LegacySalt, &[u8])> {
+    combinator::all_consuming(sequence::tuple((
+        // 2-byte salt
+        combinator::map(
+            combinator::map_res(bytes::complete::take(2_usize), |slice: &[u8]| slice.try_into()),
+            |arr: [u8; 2]| arr.into(),
+        ),
+        // 14-byte encrypted metadata key plus encrypted DEs, which must together be at least 16
+        // bytes (AES block size), and at most a full DE minus the size of the salt.
+        bytes::complete::take_while_m_n(16_usize, NP_MAX_DE_CONTENT_LEN - 2, |_| true),
+    )))(de_contents)
+}
+
+/// A data element with content length determined and validated per its type's length rules, but
+/// no further decoding performed.
+#[derive(Debug, PartialEq, Eq)]
+struct RawDataElement<'d> {
+    de_type: DataElementType,
+    contents: &'d [u8],
+}
+
+/// An advertisement broken down into data elements, but before decryption or mapping to higher
+/// level DE representations.
+#[derive(Debug, PartialEq, Eq)]
+enum RawAdvertisement<'d> {
+    Plaintext(PlaintextAdvRawContents<'d>),
+    Ciphertext(EncryptedAdvContents<'d>),
+}
+
+/// A plaintext advertisement's content in raw DEs but without further deserialization.
+#[derive(Debug, PartialEq, Eq)]
+struct PlaintextAdvRawContents<'d> {
+    identity_type: PlaintextIdentityMode,
+    data_elements: Vec<RawPlainDataElement<'d>>,
+}
+
+impl<'d> PlaintextAdvRawContents<'d> {
+    /// Deserialize the DE contents into per-DE-type structures.
+    ///
+    /// Returns `Some` if each DE's contents can be successfully deserialized, otherwise `None`.
+    fn try_deserialize(&self) -> Result<PlaintextAdvContents, DataElementDeserializeError> {
+        self.data_elements
+            .iter()
+            .map(|de| de.try_deserialize::<Plaintext>())
+            .collect::<Result<Vec<_>, _>>()
+            .map(|des| PlaintextAdvContents {
+                identity_type: self.identity_type,
+                data_elements: des,
+            })
+    }
+}
+
+/// A "plain" data element (not a container) without parsing the content.
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) struct RawPlainDataElement<'d> {
+    de_type: PlainDataElementType,
+    contents: &'d [u8],
+}
+
+impl<'d> RawPlainDataElement<'d> {
+    /// Deserialize into a [PlainDataElement] to expose DE-type-specific data representations.
+    ///
+    /// Returns `None` if the contents of the raw DE can't be deserialized into the corresponding
+    /// DE's representation.
+    fn try_deserialize<F>(&self) -> Result<PlainDataElement<F>, DataElementDeserializeError>
+    where
+        F: PacketFlavor,
+        actions::ActionsDataElement<F>: DataElement,
+    {
+        match self.de_type {
+            PlainDataElementType::Actions => {
+                actions::ActionsDataElement::deserialize::<F>(self.contents)
+                    .map(PlainDataElement::Actions)
+            }
+            PlainDataElementType::TxPower => {
+                TxPowerDataElement::deserialize::<F>(self.contents).map(PlainDataElement::TxPower)
+            }
+        }
+    }
+}
+
+/// Contents of an encrypted advertisement before decryption.
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) struct EncryptedAdvContents<'d> {
+    identity_type: EncryptedIdentityDataElementType,
+    /// Salt from the advertisement, converted into a padder.
+    /// Pre-calculated so it's only derived once across multiple decrypt attempts.
+    salt_padder: ldt::XorPadder<{ crypto_provider::aes::BLOCK_SIZE }>,
+    /// The salt instance used for encryption of this advertisement.
+    salt: LegacySalt,
+    /// Ciphertext containing the metadata key and any data elements
+    ciphertext: &'d [u8],
+}
+
+impl<'d> EncryptedAdvContents<'d> {
+    /// Try decrypting with an identity's LDT cipher and deserializing the resulting data elements.
+    ///
+    /// Returns the decrypted data if decryption and verification succeeded and the resulting DEs could be parsed
+    /// successfully, otherwise `Err`.
+    pub(crate) fn try_decrypt<C: CryptoProvider>(
+        &self,
+        cipher: &ldt_np_adv::LdtNpAdvDecrypterXtsAes128<C>,
+    ) -> Result<DecryptedAdvContents, DecryptError> {
+        let plaintext = cipher
+            .decrypt_and_verify(self.ciphertext, &self.salt_padder)
+            .map_err(|_e| DecryptError::DecryptOrVerifyError)?;
+
+        // plaintext starts with 14 bytes of metadata key, then DEs.
+
+        let (remaining, metadata_key) = combinator::map_res(
+            bytes::complete::take(NP_LEGACY_METADATA_KEY_LEN),
+            |slice: &[u8]| slice.try_into(),
+        )(plaintext.as_slice())
+        .map_err(|_e: nom::Err<nom::error::Error<&[u8]>>| {
+            DecryptError::DeserializeError(AdvDeserializeError::AdvertisementDeserializeError)
+        })?;
+
+        let (_remaining, raw_des) = combinator::all_consuming(parse_data_elements)(remaining)
+            .map_err(|_e| {
+                DecryptError::DeserializeError(AdvDeserializeError::AdvertisementDeserializeError)
+            })?;
+
+        plain_data_elements(&raw_des)?
+            .into_iter()
+            .map(|de| de.try_deserialize())
+            .collect::<Result<Vec<_>, _>>()
+            .map_err(|e| {
+                DecryptError::DeserializeError(AdvDeserializeError::DataElementDeserializeError(e))
+            })
+            .map(|data_elements| {
+                DecryptedAdvContents::new(
+                    self.identity_type,
+                    metadata_key,
+                    self.salt,
+                    data_elements,
+                )
+            })
+    }
+}
+
+/// Errors that can occur decrypting encrypted advertisements.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub(crate) enum DecryptError {
+    /// Decrypting or verifying the advertisement ciphertext failed
+    DecryptOrVerifyError,
+    /// Decrypting succeeded, but deserializing from the plaintext failed
+    DeserializeError(AdvDeserializeError),
+}
+
+impl From<AdvDeserializeError> for DecryptError {
+    fn from(e: AdvDeserializeError) -> Self {
+        DecryptError::DeserializeError(e)
+    }
+}
+
+/// All v0 normal DE types with deserialized contents.
+#[derive(Debug, PartialEq, Eq)]
+#[allow(missing_docs)]
+pub enum PlainDataElement<F: PacketFlavor> {
+    Actions(actions::ActionsDataElement<F>),
+    TxPower(TxPowerDataElement),
+}
+
+/// The contents of a plaintext advertisement after deserializing DE contents
+#[derive(Debug, PartialEq, Eq)]
+pub struct PlaintextAdvContents {
+    identity_type: PlaintextIdentityMode,
+    data_elements: Vec<PlainDataElement<Plaintext>>,
+}
+
+impl PlaintextAdvContents {
+    /// Returns the identity type used for the advertisement
+    pub fn identity(&self) -> PlaintextIdentityMode {
+        self.identity_type
+    }
+    /// Returns the deserialized data elements
+    pub fn data_elements(&self) -> impl Iterator<Item = &PlainDataElement<Plaintext>> {
+        self.data_elements.iter()
+    }
+    /// Destructures this V0 plaintext advertisement
+    /// into just the contained data elements
+    pub fn to_data_elements(self) -> Vec<PlainDataElement<Plaintext>> {
+        self.data_elements
+    }
+}
+
+/// Contents of an encrypted advertisement after decryption and deserializing DEs.
+#[derive(Debug, PartialEq, Eq)]
+pub struct DecryptedAdvContents {
+    identity_type: EncryptedIdentityDataElementType,
+    metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN],
+    salt: LegacySalt,
+    data_elements: Vec<PlainDataElement<Ciphertext>>,
+}
+
+impl DecryptedAdvContents {
+    /// Returns a new DecryptedAdvContents with the provided contents.
+    fn new(
+        identity_type: EncryptedIdentityDataElementType,
+        metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN],
+        salt: LegacySalt,
+        data_elements: Vec<PlainDataElement<Ciphertext>>,
+    ) -> Self {
+        Self { identity_type, metadata_key, salt, data_elements }
+    }
+
+    /// The type of identity DE used in the advertisement.
+    pub fn identity_type(&self) -> EncryptedIdentityDataElementType {
+        self.identity_type
+    }
+
+    /// The decrypted metadata key from the identity DE.
+    pub fn metadata_key(&self) -> &[u8; 14] {
+        &self.metadata_key
+    }
+
+    /// Iterator over the data elements in an advertisement, except for any DEs related to resolving
+    /// the identity or otherwise validating the payload (e.g. any identity DEs like Private
+    /// Identity).
+    pub fn data_elements(&self) -> impl Iterator<Item = &PlainDataElement<Ciphertext>> {
+        self.data_elements.iter()
+    }
+
+    /// The salt used for decryption of this advertisement.
+    pub fn salt(&self) -> LegacySalt {
+        self.salt
+    }
+}
+
+/// The contents of an advertisement after plaintext DEs, if any, have been deserialized, but
+/// before any decryption is done.
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) enum IntermediateAdvContents<'d> {
+    /// Plaintext advertisements
+    Plaintext(PlaintextAdvContents),
+    /// Ciphertext advertisements
+    Ciphertext(EncryptedAdvContents<'d>),
+}
diff --git a/nearby/presence/np_adv/src/legacy/deserialize/tests.rs b/nearby/presence/np_adv/src/legacy/deserialize/tests.rs
new file mode 100644
index 0000000..b577cd9
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/deserialize/tests.rs
@@ -0,0 +1,815 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use super::*;
+use crate::legacy::actions::{ActionBits, ActionsDataElement};
+use crate::shared_data::TxPower;
+use crate::{
+    de_type::IdentityDataElementType,
+    legacy::{
+        actions,
+        de_type::DeActualLength,
+        random_data_elements::{random_de_ciphertext, random_de_plaintext},
+        serialize::{
+            encode_de_header_actual_len, id_de_type_as_generic_de_type, AdvBuilder,
+            DataElementBundle, Identity, LdtIdentity, ToDataElementBundle as _,
+        },
+        PacketFlavorEnum, BLE_ADV_SVC_CONTENT_LEN,
+    },
+    parse_adv_header, shared_data, AdvHeader, NoIdentity, PublicIdentity,
+};
+use array_view::ArrayView;
+use crypto_provider_default::CryptoProviderImpl;
+use init_with::InitWith as _;
+use ldt_np_adv::LdtEncrypterXtsAes128;
+use nom::error;
+use rand_ext::rand::{prelude::SliceRandom, Rng as _};
+use std::vec;
+use strum::IntoEnumIterator as _;
+
+#[test]
+fn parse_empty_raw_adv() {
+    let data_elements = parse_raw_adv_contents::<CryptoProviderImpl>(&[]).unwrap();
+    assert_eq!(
+        RawAdvertisement::Plaintext(PlaintextAdvRawContents {
+            identity_type: PlaintextIdentityMode::None,
+            data_elements: Vec::new()
+        }),
+        data_elements
+    );
+}
+
+#[test]
+fn parse_raw_adv_1_de_short_no_identity() {
+    // battery uses the header length as is
+    let adv = parse_raw_adv_contents::<CryptoProviderImpl>(&[0x36, 0x01, 0x02, 0x03]).unwrap();
+    assert_eq!(
+        RawAdvertisement::Plaintext(PlaintextAdvRawContents {
+            identity_type: PlaintextIdentityMode::None,
+            data_elements: vec![RawPlainDataElement {
+                de_type: PlainDataElementType::Actions,
+                contents: &[0x01, 0x02, 0x03]
+            }],
+        }),
+        adv
+    );
+}
+
+#[test]
+fn parse_raw_adv_1_de_long_private_identity() {
+    // 3 bytes of payload after metadata key
+    let adv = parse_raw_adv_contents::<CryptoProviderImpl>(&[
+        0x31, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
+        0x0F, 0x10, 0x11, 0x12, 0x13,
+    ])
+    .unwrap();
+    assert_eq!(
+        RawAdvertisement::Ciphertext(EncryptedAdvContents {
+            identity_type: EncryptedIdentityDataElementType::Private,
+            salt_padder: ldt_np_adv::salt_padder::<16, CryptoProviderImpl>(
+                ldt_np_adv::LegacySalt::from([0x01, 0x02])
+            ),
+            salt: ldt_np_adv::LegacySalt::from([0x01, 0x02]),
+            ciphertext: &[
+                0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10,
+                0x11, 0x12, 0x13
+            ]
+        }),
+        adv
+    );
+}
+
+#[test]
+fn parse_raw_adv_3_de_public_identity() {
+    let adv = parse_raw_adv_contents::<CryptoProviderImpl>(&[
+        0x03, // public identity
+        0x15, 0x05, // tx power 5
+        0x36, 0x11, 0x12, 0x13, // actions
+    ])
+    .unwrap();
+    assert_eq!(
+        RawAdvertisement::Plaintext(PlaintextAdvRawContents {
+            identity_type: PlaintextIdentityMode::Public,
+            data_elements: vec![
+                RawPlainDataElement { de_type: PlainDataElementType::TxPower, contents: &[0x05] },
+                RawPlainDataElement {
+                    de_type: PlainDataElementType::Actions,
+                    contents: &[0x11, 0x12, 0x13]
+                }
+            ],
+        }),
+        adv
+    );
+}
+
+#[test]
+fn parse_raw_adv_0_de_public_identity() {
+    let adv = parse_raw_adv_contents::<CryptoProviderImpl>(&[
+        0x03, // public identity
+    ])
+    .unwrap();
+    assert_eq!(
+        RawAdvertisement::Plaintext(PlaintextAdvRawContents {
+            identity_type: PlaintextIdentityMode::Public,
+            data_elements: vec![],
+        }),
+        adv
+    );
+}
+
+#[test]
+fn parse_raw_adv_1_de_length_overrun() {
+    // battery uses the header length as is
+    let input = &[0xFB, 0x01, 0x02, 0x03];
+    assert_eq!(
+        nom::Err::Error(error::Error { input: input.as_slice(), code: error::ErrorKind::Eof }),
+        parse_data_elements(input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_raw_adv_public_identity_containing_public_identity() {
+    let input = &[
+        0x03, // public identity
+        0x03, // another public identity
+        0x15, 0x03, // tx power de
+    ];
+    assert_eq!(
+        AdvDeserializeError::InvalidDataElementHierarchy,
+        parse_raw_adv_contents::<CryptoProviderImpl>(input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_raw_adv_no_identity_containing_public_identity() {
+    let input = &[
+        0x15, 0x03, // tx power de
+        0x03, // public identity -- since it's not the first, this is a no identity adv
+        0x15, 0x03, // tx power de
+    ];
+    assert_eq!(
+        AdvDeserializeError::InvalidDataElementHierarchy,
+        parse_raw_adv_contents::<CryptoProviderImpl>(input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_raw_adv_1_de_long_private_identity_with_another_top_level_de() {
+    let input = &[
+        0x31, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
+        0x0F, 0x10, 0x11, 0x12, 0x13, // private identity
+        0x15, 0x03, // tx power de
+    ];
+    assert_eq!(
+        AdvDeserializeError::TooManyTopLevelDataElements,
+        parse_raw_adv_contents::<CryptoProviderImpl>(input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_raw_adv_private_identity_ciphertext_min_length() {
+    let short_input = &[
+        // private identity w/ salt, len = 1
+        0x11, 0x10, 0x11, // 15 ciphertext bytes, + 2 salt = 17 total
+        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E,
+    ];
+    assert_eq!(
+        AdvDeserializeError::AdvertisementDeserializeError,
+        parse_raw_adv_contents::<CryptoProviderImpl>(short_input).unwrap_err()
+    );
+
+    let ok_input = &[
+        // private identity w/ salt
+        0x21, 0x10, 0x11, // 16 ciphertext bytes, 18 bytes total de len, encoded len 2
+        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E,
+        0x2F,
+    ];
+    assert_eq!(
+        RawAdvertisement::Ciphertext(EncryptedAdvContents {
+            identity_type: EncryptedIdentityDataElementType::Private,
+            salt: [0x10, 0x11].into(),
+            salt_padder: ldt_np_adv::salt_padder::<16, CryptoProviderImpl>([0x10, 0x11].into()),
+            ciphertext: &ok_input[3..]
+        }),
+        parse_raw_adv_contents::<CryptoProviderImpl>(ok_input).unwrap()
+    );
+}
+
+#[test]
+fn parse_raw_adv_private_identity_ciphertext_too_long() {
+    let long_input = &[
+        // private identity w/ salt, len = 7
+        0x71, 0x10, 0x11, // 21 ciphertext bytes, + 2 salt
+        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E,
+        0x2F, 0x30, 0x31, 0x32, 0x33, 0x34,
+    ];
+    assert_eq!(
+        AdvDeserializeError::AdvertisementDeserializeError,
+        parse_raw_adv_contents::<CryptoProviderImpl>(long_input).unwrap_err()
+    );
+
+    // removing 1 byte makes it work
+    let ok_input = &[
+        // private identity w/ salt, len = 6
+        0x61, 0x10, 0x11, // 20 ciphertext bytes, + 2 salt
+        0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E,
+        0x2F, 0x30, 0x31, 0x32, 0x33,
+    ];
+    assert_eq!(
+        RawAdvertisement::Ciphertext(EncryptedAdvContents {
+            identity_type: EncryptedIdentityDataElementType::Private,
+            salt_padder: ldt_np_adv::salt_padder::<16, CryptoProviderImpl>([0x10, 0x11].into()),
+            salt: [0x10, 0x11].into(),
+            ciphertext: &ok_input[3..]
+        }),
+        parse_raw_adv_contents::<CryptoProviderImpl>(ok_input).unwrap()
+    );
+}
+
+/// Test method body that creates an array, deserializes it into a DE, serializes it,
+/// and asserts that the same bytes are produced.
+///
+/// Evaluates to the deserialized DE.
+macro_rules! de_roundtrip_test {
+    ($de_type:ty, $type_variant:ident, $de_variant:ident, $flavor:ty,  $bytes:expr) => {{
+        let parsed_de_enum = parse_plain_de::<$flavor>(PlainDataElementType::$type_variant, $bytes);
+        if let PlainDataElement::$de_variant(de) = parsed_de_enum {
+            let expected = <$de_type>::deserialize::<$flavor>($bytes).unwrap();
+            assert_eq!(expected, de);
+
+            let de_bundle: DataElementBundle<$flavor> = de.to_de_bundle();
+            assert_eq!($bytes, de_bundle.contents_as_slice());
+
+            de
+        } else {
+            panic!("Unexpected variant: {:?}", parsed_de_enum);
+        }
+    }};
+}
+
+#[test]
+fn actions_de_contents_roundtrip_plaintext() {
+    let actions = actions::tests::all_plaintext_actions();
+    let bundle = actions::ActionsDataElement::from(actions).to_de_bundle();
+
+    de_roundtrip_test!(
+        actions::ActionsDataElement::<Plaintext>,
+        Actions,
+        Actions,
+        Plaintext,
+        bundle.contents_as_slice()
+    );
+}
+
+#[test]
+fn actions_de_contents_roundtrip_ciphertext() {
+    let actions = actions::tests::all_ciphertext_actions();
+    let bundle = actions::ActionsDataElement::from(actions).to_de_bundle();
+
+    de_roundtrip_test!(
+        actions::ActionsDataElement::<Ciphertext>,
+        Actions,
+        Actions,
+        Ciphertext,
+        bundle.contents_as_slice()
+    );
+}
+
+#[test]
+fn tx_power_de_contents_roundtrip_plaintext() {
+    let tx = shared_data::TxPower::try_from(-10).unwrap();
+    let bundle: DataElementBundle<Plaintext> = TxPowerDataElement::from(tx).to_de_bundle();
+
+    de_roundtrip_test!(TxPowerDataElement, TxPower, TxPower, Plaintext, bundle.contents_as_slice());
+}
+
+#[test]
+fn tx_power_de_contents_roundtrip_ciphertext() {
+    let tx = shared_data::TxPower::try_from(-10).unwrap();
+    let bundle: DataElementBundle<Ciphertext> = TxPowerDataElement::from(tx).to_de_bundle();
+
+    de_roundtrip_test!(
+        TxPowerDataElement,
+        TxPower,
+        TxPower,
+        Ciphertext,
+        bundle.contents_as_slice()
+    );
+}
+
+#[test]
+fn parse_de_invalid_de_len_error() {
+    let input = &[
+        // bogus 6-byte battery de -- only allows length = 3
+        0x6B, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+    ];
+
+    assert_eq!(
+        nom::Err::Error(error::Error { input: input.as_slice(), code: error::ErrorKind::MapOpt }),
+        parse_de(&input[..]).unwrap_err()
+    );
+}
+
+#[test]
+fn plain_data_elements_matches_plain_des() {
+    assert_eq!(
+        vec![
+            RawPlainDataElement { de_type: PlainDataElementType::TxPower, contents: &[0x01] },
+            RawPlainDataElement { de_type: PlainDataElementType::Actions, contents: &[0x02] }
+        ],
+        plain_data_elements(&[
+            RawDataElement { de_type: DataElementType::TxPower, contents: &[0x01] },
+            RawDataElement { de_type: DataElementType::Actions, contents: &[0x02] }
+        ])
+        .unwrap()
+    );
+}
+
+#[test]
+fn plain_data_elements_rejects_identity_de_error() {
+    for idet in IdentityDataElementType::iter() {
+        assert_eq!(
+            AdvDeserializeError::InvalidDataElementHierarchy,
+            plain_data_elements(&[
+                RawDataElement { de_type: DataElementType::TxPower, contents: &[0x01] },
+                RawDataElement { de_type: id_de_type_as_generic_de_type(idet), contents: &[0x02] }
+            ])
+            .unwrap_err()
+        );
+    }
+}
+
+#[test]
+fn parse_encrypted_identity_contents_too_short_error() {
+    // 2 byte salt + 15 byte ciphertext: 1 too short
+    let input = <[u8; 17]>::init_with_indices(|i| i as u8);
+    assert_eq!(
+        nom::Err::Error(error::Error { input: &input[2..], code: error::ErrorKind::TakeWhileMN }),
+        parse_encrypted_identity_de_contents(&input).unwrap_err()
+    );
+}
+
+#[test]
+fn parse_encrypted_identity_contents_ok() {
+    // 2 byte salt + minimum 16 byte ciphertext
+    let input = <[u8; 18]>::init_with_indices(|i| i as u8);
+    assert_eq!(
+        ([].as_slice(), (ldt_np_adv::LegacySalt::from([0, 1]), &input[2..])),
+        parse_encrypted_identity_de_contents(&input).unwrap()
+    );
+}
+
+#[test]
+fn plaintext_random_adv_contents_round_trip_public() {
+    plaintext_random_adv_contents_round_trip(PublicIdentity::default, PlaintextIdentityMode::Public)
+}
+
+#[test]
+fn plaintext_random_adv_contents_round_trip_no_identity() {
+    plaintext_random_adv_contents_round_trip(NoIdentity::default, PlaintextIdentityMode::None)
+}
+
+#[test]
+fn ciphertext_random_adv_contents_round_trip() {
+    let mut rng = rand_ext::seeded_rng();
+    let de_types: Vec<PlainDataElementType> = PlainDataElementType::iter()
+        .filter(|t| t.supports_flavor(PacketFlavorEnum::Ciphertext))
+        .collect();
+    let identity_de_types: Vec<EncryptedIdentityDataElementType> =
+        EncryptedIdentityDataElementType::iter().collect();
+
+    for _ in 0..10_000 {
+        let mut des = Vec::new();
+
+        let identity_type = *identity_de_types.choose(&mut rng).unwrap();
+        let key_seed: [u8; 32] = rng.gen();
+        let salt: ldt_np_adv::LegacySalt = rng.gen::<[u8; 2]>().into();
+        let metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN] = rng.gen();
+        let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+        let ldt_key = hkdf.legacy_ldt_key();
+        let metadata_key_hmac: [u8; 32] =
+            hkdf.legacy_metadata_key_hmac_key().calculate_hmac(&metadata_key);
+        let cipher = ldt_np_adv::build_np_adv_decrypter_from_key_seed(&hkdf, metadata_key_hmac);
+        let mut builder = AdvBuilder::new(LdtIdentity::<CryptoProviderImpl>::new(
+            identity_type,
+            salt,
+            metadata_key,
+            LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(&ldt_key),
+        ));
+
+        loop {
+            let de_type = *de_types.choose(&mut rng).unwrap();
+            let (de, bundle) = random_de_ciphertext(de_type, &mut rng).unwrap();
+
+            if builder.add_data_element(bundle.clone()).ok().is_none() {
+                // out of room
+                if des.is_empty() {
+                    // need at least one, so try again
+                    continue;
+                } else {
+                    // there's at least one so proceed to serialization
+                    break;
+                }
+            }
+
+            des.push(de);
+        }
+
+        let serialized = builder.into_advertisement().unwrap();
+        let (remaining, header) = parse_adv_header(serialized.as_slice()).unwrap();
+        let parsed_adv = deserialize_adv_contents::<CryptoProviderImpl>(remaining).unwrap();
+
+        assert_eq!(AdvHeader::V0, header);
+        if let IntermediateAdvContents::Ciphertext(eac) = parsed_adv {
+            assert_eq!(
+                EncryptedAdvContents {
+                    identity_type,
+                    salt_padder: ldt_np_adv::salt_padder::<16, CryptoProviderImpl>(salt),
+                    salt,
+                    // skip adv header, de header, salt
+                    ciphertext: &serialized.as_slice()[4..]
+                },
+                eac
+            );
+
+            assert_eq!(
+                DecryptedAdvContents { identity_type, metadata_key, salt, data_elements: des },
+                eac.try_decrypt(&cipher).unwrap()
+            )
+        } else {
+            panic!("Unexpected variant: {:?}", parsed_adv);
+        }
+    }
+}
+
+#[test]
+fn decrypt_and_deserialize_ciphertext_adv_canned() {
+    let key_seed = [0x11_u8; 32];
+    let salt: ldt_np_adv::LegacySalt = [0x22; 2].into();
+    let metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN] = [0x33; NP_LEGACY_METADATA_KEY_LEN];
+
+    let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let ldt_key = hkdf.legacy_ldt_key();
+    let metadata_key_hmac: [u8; 32] =
+        hkdf.legacy_metadata_key_hmac_key().calculate_hmac(&metadata_key);
+    let cipher = ldt_np_adv::build_np_adv_decrypter_from_key_seed(&hkdf, metadata_key_hmac);
+    let mut builder = AdvBuilder::new(LdtIdentity::<CryptoProviderImpl>::new(
+        EncryptedIdentityDataElementType::Private,
+        salt,
+        metadata_key,
+        LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(&ldt_key),
+    ));
+
+    let tx = shared_data::TxPower::try_from(3).unwrap();
+    builder.add_data_element(TxPowerDataElement::from(tx)).unwrap();
+
+    let serialized = builder.into_advertisement().unwrap();
+
+    assert_eq!(
+        &[
+            0x0,  // adv header
+            0x21, // private DE
+            0x22, 0x22, // salt
+            // ciphertext
+            0x85, 0xBF, 0xA8, 0x83, 0x58, 0x7C, 0x50, 0xCF, 0x98, 0x38, 0xA7, 0x8A, 0xC0, 0x1C,
+            0x96, 0xF9
+        ],
+        serialized.as_slice()
+    );
+
+    let (remaining, header) = parse_adv_header(serialized.as_slice()).unwrap();
+    assert_eq!(AdvHeader::V0, header);
+
+    let parsed_adv = deserialize_adv_contents::<CryptoProviderImpl>(remaining).unwrap();
+    if let IntermediateAdvContents::Ciphertext(eac) = parsed_adv {
+        assert_eq!(
+            EncryptedAdvContents {
+                identity_type: EncryptedIdentityDataElementType::Private,
+                salt_padder: ldt_np_adv::salt_padder::<16, CryptoProviderImpl>(salt),
+                salt,
+                // skip adv header, de header, salt
+                ciphertext: &serialized.as_slice()[4..]
+            },
+            eac
+        );
+
+        assert_eq!(
+            DecryptedAdvContents {
+                identity_type: EncryptedIdentityDataElementType::Private,
+                metadata_key,
+                salt,
+                data_elements: vec![PlainDataElement::TxPower(TxPowerDataElement::from(
+                    TxPower::try_from(3).unwrap()
+                ))],
+            },
+            eac.try_decrypt(&cipher).unwrap()
+        )
+    } else {
+        panic!("Unexpected variant: {:?}", parsed_adv);
+    }
+}
+
+#[test]
+fn decrypt_and_deserialize_plaintext_adv_canned() {
+    let mut builder = AdvBuilder::new(PublicIdentity::default());
+
+    let actions = ActionBits::default();
+    builder.add_data_element(ActionsDataElement::from(actions)).unwrap();
+
+    let serialized = builder.into_advertisement().unwrap();
+
+    assert_eq!(
+        &[
+            0x0,  // adv header
+            0x03, // public DE
+            0x16, 0x00 // actions
+        ],
+        serialized.as_slice()
+    );
+
+    let (remaining, header) = parse_adv_header(serialized.as_slice()).unwrap();
+    assert_eq!(AdvHeader::V0, header);
+
+    let parsed_adv = deserialize_adv_contents::<CryptoProviderImpl>(remaining).unwrap();
+    if let IntermediateAdvContents::Plaintext(parc) = parsed_adv {
+        assert_eq!(
+            PlaintextAdvContents {
+                identity_type: PlaintextIdentityMode::Public,
+                data_elements: vec![PlainDataElement::Actions(ActionsDataElement::from(
+                    ActionBits::default()
+                ))],
+            },
+            parc
+        )
+    } else {
+        panic!("Unexpected variant: {:?}", parsed_adv);
+    }
+}
+
+#[test]
+fn decrypt_with_wrong_key_seed_error() {
+    let salt = ldt_np_adv::LegacySalt::from([0x22; 2]);
+    let metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN] = [0x33; NP_LEGACY_METADATA_KEY_LEN];
+    let correct_key_seed = [0x11_u8; 32];
+
+    let (adv_content, correct_cipher) =
+        build_ciphertext_adv_contents(salt, &metadata_key, correct_key_seed);
+    let eac = parse_ciphertext_adv_contents(&correct_cipher, &adv_content.as_slice()[1..]);
+
+    // wrong key seed doesn't work (derives wrong ldt key, wrong hmac key)
+    let wrong_key_seed_cipher = {
+        let key_seed = [0x22_u8; 32];
+
+        let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+        let metadata_key_hmac: [u8; 32] =
+            hkdf.legacy_metadata_key_hmac_key().calculate_hmac(&metadata_key);
+        ldt_np_adv::build_np_adv_decrypter_from_key_seed(&hkdf, metadata_key_hmac)
+    };
+
+    assert_eq!(
+        DecryptError::DecryptOrVerifyError,
+        eac.try_decrypt(&wrong_key_seed_cipher,).unwrap_err()
+    );
+}
+
+#[test]
+fn decrypt_with_wrong_hmac_key_error() {
+    let salt = ldt_np_adv::LegacySalt::from([0x22; 2]);
+    let metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN] = [0x33; NP_LEGACY_METADATA_KEY_LEN];
+    let correct_key_seed = [0x11_u8; 32];
+
+    let (adv_content, correct_cipher_config) =
+        build_ciphertext_adv_contents(salt, &metadata_key, correct_key_seed);
+    let eac = parse_ciphertext_adv_contents(&correct_cipher_config, &adv_content.as_slice()[1..]);
+
+    let wrong_hmac_key_cipher = {
+        let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&[0x10_u8; 32]);
+        let metadata_key_hmac: [u8; 32] =
+            hkdf.legacy_metadata_key_hmac_key().calculate_hmac(&metadata_key);
+
+        ldt_np_adv::build_np_adv_decrypter_from_key_seed(&hkdf, metadata_key_hmac)
+    };
+
+    assert_eq!(
+        DecryptError::DecryptOrVerifyError,
+        eac.try_decrypt::<CryptoProviderImpl>(&wrong_hmac_key_cipher,).unwrap_err()
+    );
+}
+
+#[test]
+fn decrypt_with_wrong_hmac_error() {
+    let salt = ldt_np_adv::LegacySalt::from([0x22; 2]);
+    let metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN] = [0x33; NP_LEGACY_METADATA_KEY_LEN];
+    let correct_key_seed = [0x11_u8; 32];
+
+    let (adv_content, correct_cipher_config) =
+        build_ciphertext_adv_contents(salt, &metadata_key, correct_key_seed);
+    let eac = parse_ciphertext_adv_contents(&correct_cipher_config, &adv_content.as_slice()[1..]);
+
+    let wrong_hmac_key_cipher = {
+        let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&correct_key_seed);
+
+        ldt_np_adv::build_np_adv_decrypter_from_key_seed(&hkdf, [0x77; 32])
+    };
+
+    assert_eq!(
+        DecryptError::DecryptOrVerifyError,
+        eac.try_decrypt(&wrong_hmac_key_cipher,).unwrap_err()
+    );
+}
+
+#[test]
+fn decrypt_and_deserialize_ciphertext_with_public_adv_inside_error() {
+    let key_seed = [0x11_u8; 32];
+    let salt: ldt_np_adv::LegacySalt = [0x22; 2].into();
+    let metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN] = [0x33; NP_LEGACY_METADATA_KEY_LEN];
+
+    let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let ldt_key = hkdf.legacy_ldt_key();
+    let metadata_key_hmac: [u8; 32] =
+        hkdf.legacy_metadata_key_hmac_key().calculate_hmac(&metadata_key);
+    let cipher = ldt_np_adv::build_np_adv_decrypter_from_key_seed(&hkdf, metadata_key_hmac);
+
+    let mut plaintext = vec![];
+    plaintext.extend_from_slice(&metadata_key);
+
+    let txpower_de = TxPowerDataElement::from(TxPower::try_from(5).unwrap());
+
+    plaintext.push(
+        encode_de_header_actual_len(DataElementType::TxPower, 1u8.try_into().unwrap()).unwrap(),
+    );
+
+    let plaintext_de_bundle: DataElementBundle<Plaintext> = txpower_de.to_de_bundle();
+    plaintext.extend_from_slice(plaintext_de_bundle.contents_as_slice());
+    // forge an otherwise impossible to express public identity
+    plaintext.push(
+        encode_de_header_actual_len(DataElementType::PublicIdentity, DeActualLength::ZERO).unwrap(),
+    );
+
+    assert_eq!(17, plaintext.len());
+
+    let ldt = LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(&ldt_key);
+    ldt.encrypt(&mut plaintext, &ldt_np_adv::salt_padder::<16, CryptoProviderImpl>(salt)).unwrap();
+    let ciphertext = plaintext;
+
+    let mut adv = vec![];
+    adv.push(0x00); // adv header
+    adv.push(
+        encode_de_header_actual_len(
+            DataElementType::PrivateIdentity,
+            (2 + ciphertext.len()).try_into().unwrap(),
+        )
+        .unwrap(),
+    ); // private DE
+    adv.extend_from_slice(&[0x22; 2]); // salt
+    adv.extend_from_slice(&ciphertext);
+
+    let parsed_adv = deserialize_adv_contents::<CryptoProviderImpl>(&adv[1..]).unwrap();
+    if let IntermediateAdvContents::Ciphertext(eac) = parsed_adv {
+        assert_eq!(
+            DecryptError::DeserializeError(AdvDeserializeError::InvalidDataElementHierarchy),
+            eac.try_decrypt(&cipher).unwrap_err()
+        )
+    } else {
+        panic!("Unexpected variant: {:?}", parsed_adv);
+    }
+}
+
+fn build_ciphertext_adv_contents<C: CryptoProvider>(
+    salt: ldt_np_adv::LegacySalt,
+    metadata_key: &[u8; 14],
+    correct_key_seed: [u8; 32],
+) -> (ArrayView<u8, { BLE_ADV_SVC_CONTENT_LEN }>, ldt_np_adv::LdtNpAdvDecrypterXtsAes128<C>) {
+    let hkdf = np_hkdf::NpKeySeedHkdf::<C>::new(&correct_key_seed);
+    let ldt_key = hkdf.legacy_ldt_key();
+
+    let metadata_key_hmac: [u8; 32] =
+        hkdf.legacy_metadata_key_hmac_key().calculate_hmac(metadata_key.as_slice());
+
+    let correct_cipher = ldt_np_adv::build_np_adv_decrypter_from_key_seed(&hkdf, metadata_key_hmac);
+
+    let mut builder = AdvBuilder::new(LdtIdentity::<CryptoProviderImpl>::new(
+        EncryptedIdentityDataElementType::Private,
+        salt,
+        *metadata_key,
+        LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(&ldt_key),
+    ));
+    builder.add_data_element(TxPowerDataElement::from(TxPower::try_from(3).unwrap())).unwrap();
+    (builder.into_advertisement().unwrap(), correct_cipher)
+}
+
+fn parse_ciphertext_adv_contents<'b>(
+    cipher: &ldt_np_adv::LdtNpAdvDecrypterXtsAes128<CryptoProviderImpl>,
+    adv_content: &'b [u8],
+) -> EncryptedAdvContents<'b> {
+    let eac = match deserialize_adv_contents::<CryptoProviderImpl>(adv_content).unwrap() {
+        IntermediateAdvContents::Plaintext(_) => panic!(),
+        // quick confirmation that we did get something
+        IntermediateAdvContents::Ciphertext(eac) => eac,
+    };
+
+    // correct cipher works
+    assert!(eac.try_decrypt(cipher).is_ok());
+
+    eac
+}
+
+/// Construct the serialized DE and parse it
+fn parse_plain_de<F>(de_type: PlainDataElementType, contents: &[u8]) -> PlainDataElement<F>
+where
+    F: PacketFlavor,
+    actions::ActionsDataElement<F>: DataElement,
+{
+    let mut buf = vec![];
+    buf.push(
+        encode_de_header_actual_len(
+            de_type.as_generic_de_type(),
+            contents.len().try_into().unwrap(),
+        )
+        .unwrap(),
+    );
+    buf.extend_from_slice(contents);
+
+    let raw_de = combinator::all_consuming(parse_de)(&buf).map(|(_remaining, de)| de).unwrap();
+
+    let plain_des = plain_data_elements(&[raw_de]).unwrap();
+    assert_eq!(1, plain_des.len());
+    plain_des.first().unwrap().try_deserialize().unwrap()
+}
+
+fn plaintext_random_adv_contents_round_trip<I: Identity<Flavor = Plaintext>, F: Fn() -> I>(
+    mk_identity: F,
+    identity_type: PlaintextIdentityMode,
+) {
+    let mut rng = rand_ext::seeded_rng();
+    let de_types: Vec<PlainDataElementType> = PlainDataElementType::iter()
+        .filter(|t| t.supports_flavor(PacketFlavorEnum::Plaintext))
+        .collect();
+
+    for _ in 0..10_000 {
+        let mut de_tuples = Vec::new();
+        let mut builder = AdvBuilder::new(mk_identity());
+
+        loop {
+            let de_type = *de_types.choose(&mut rng).unwrap();
+            let (de, bundle) = random_de_plaintext(de_type, &mut rng).unwrap();
+
+            if builder.add_data_element(bundle.clone()).ok().is_none() {
+                // out of room
+                break;
+            }
+
+            de_tuples.push((de, de_type, bundle));
+        }
+
+        let serialized = builder.into_advertisement().unwrap();
+
+        let (_rem, header) =
+            combinator::all_consuming(parse_adv_header)(&serialized.as_slice()[..1]).unwrap();
+        let parsed_adv =
+            parse_raw_adv_contents::<CryptoProviderImpl>(&serialized.as_slice()[1..]).unwrap();
+
+        assert_eq!(AdvHeader::V0, header);
+        if let RawAdvertisement::Plaintext(parc) = parsed_adv {
+            assert_eq!(
+                PlaintextAdvRawContents {
+                    identity_type,
+                    data_elements: de_tuples
+                        .iter()
+                        .map(|(_de, de_type, bundle)| RawPlainDataElement {
+                            de_type: *de_type,
+                            contents: bundle.contents_as_slice(),
+                        })
+                        .collect()
+                },
+                parc
+            );
+
+            assert_eq!(
+                PlaintextAdvContents {
+                    identity_type,
+                    data_elements: de_tuples
+                        .into_iter()
+                        .map(|(de, _de_type, _bundle)| de)
+                        .collect(),
+                },
+                parc.try_deserialize().unwrap()
+            )
+        } else {
+            panic!("Unexpected variant: {:?}", parsed_adv);
+        }
+    }
+}
diff --git a/nearby/presence/np_adv/src/legacy/mod.rs b/nearby/presence/np_adv/src/legacy/mod.rs
new file mode 100644
index 0000000..0eb035d
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/mod.rs
@@ -0,0 +1,66 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! V0 advertisement support.
+
+use core::fmt;
+
+pub mod actions;
+pub mod data_elements;
+pub mod de_type;
+pub mod deserialize;
+pub mod serialize;
+
+#[cfg(test)]
+mod random_data_elements;
+
+/// Advertisement capacity after 5 bytes of BLE header and 2 bytes of svc UUID are reserved from a
+/// 31-byte advertisement
+pub const BLE_ADV_SVC_CONTENT_LEN: usize = 24;
+/// Maximum possible DE content: packet size minus 2 for adv header & DE header
+const NP_MAX_DE_CONTENT_LEN: usize = BLE_ADV_SVC_CONTENT_LEN - 2;
+
+/// Marker type to allow disambiguating between plaintext and encrypted packets at compile time.
+///
+/// See also [PacketFlavorEnum] for when runtime flavor checks are more suitable.
+pub trait PacketFlavor: fmt::Debug + Clone + Copy {
+    /// The corresponding [PacketFlavorEnum] variant.
+    const ENUM_VARIANT: PacketFlavorEnum;
+}
+
+/// Marker type for plaintext packets (public identity and no identity).
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub struct Plaintext;
+
+impl PacketFlavor for Plaintext {
+    const ENUM_VARIANT: PacketFlavorEnum = PacketFlavorEnum::Plaintext;
+}
+
+/// Marker type for ciphertext packets (private, trusted, and provisioned identity).
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub struct Ciphertext;
+
+impl PacketFlavor for Ciphertext {
+    const ENUM_VARIANT: PacketFlavorEnum = PacketFlavorEnum::Ciphertext;
+}
+
+/// An enum version of the implementors of [PacketFlavor] for use cases where runtime checking is
+/// a better fit than compile time checking.
+#[derive(Debug, Clone, Copy, strum_macros::EnumIter, PartialEq, Eq)]
+pub enum PacketFlavorEnum {
+    /// Corresponds to [Plaintext].
+    Plaintext,
+    /// Corresponds to [Ciphertext].
+    Ciphertext,
+}
diff --git a/nearby/presence/np_adv/src/legacy/random_data_elements.rs b/nearby/presence/np_adv/src/legacy/random_data_elements.rs
new file mode 100644
index 0000000..f416ffe
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/random_data_elements.rs
@@ -0,0 +1,170 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use crate::{
+    legacy::{
+        actions::*,
+        data_elements::*,
+        de_type::PlainDataElementType,
+        deserialize::PlainDataElement,
+        serialize::{DataElementBundle, ToDataElementBundle},
+        Ciphertext, PacketFlavor, PacketFlavorEnum, Plaintext,
+    },
+    shared_data::{ContextSyncSeqNum, TxPower},
+};
+use rand_ext::rand::{self, distributions, prelude::SliceRandom as _};
+use std::prelude::rust_2021::*;
+use strum::IntoEnumIterator;
+
+impl distributions::Distribution<ActionsDataElement<Plaintext>> for distributions::Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> ActionsDataElement<Plaintext> {
+        let mut available_actions = ActionType::iter()
+            .filter(|at| at.supports_flavor(PacketFlavorEnum::Plaintext))
+            .collect::<Vec<_>>();
+        available_actions.shuffle(rng);
+
+        // choose some of the available actions.
+        let selected_actions: &[ActionType] =
+            &available_actions[0..rng.gen_range(0..available_actions.len())];
+
+        let mut bits = ActionBits::default();
+
+        for a in selected_actions {
+            match a {
+                ActionType::ContextSyncSeqNum => {
+                    bits.set_action(ContextSyncSeqNum::try_from(rng.gen_range(0..=15)).unwrap())
+                }
+                // generating boolean actions with `true` since we already did our random selection
+                // of which actions to use above
+                ActionType::NearbyShare => bits.set_action(NearbyShare::from(true)),
+                ActionType::Finder => bits.set_action(Finder::from(true)),
+                ActionType::FastPairSass => bits.set_action(FastPairSass::from(true)),
+                ActionType::ActiveUnlock
+                | ActionType::PresenceManager
+                | ActionType::InstantTethering
+                | ActionType::PhoneHub => unreachable!("not plaintext actions"),
+            }
+        }
+
+        ActionsDataElement::from(bits)
+    }
+}
+impl distributions::Distribution<ActionsDataElement<Ciphertext>> for distributions::Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> ActionsDataElement<Ciphertext> {
+        let mut available_actions = ActionType::iter()
+            .filter(|at| at.supports_flavor(PacketFlavorEnum::Ciphertext))
+            .collect::<Vec<_>>();
+        available_actions.shuffle(rng);
+
+        // choose some of the available actions
+        let selected_actions: &[ActionType] =
+            &available_actions[0..rng.gen_range(0..available_actions.len())];
+
+        let mut bits = ActionBits::default();
+
+        for a in selected_actions {
+            match a {
+                ActionType::ContextSyncSeqNum => {
+                    bits.set_action(ContextSyncSeqNum::try_from(rng.gen_range(0..=15)).unwrap())
+                }
+                ActionType::ActiveUnlock => bits.set_action(ActiveUnlock::from(true)),
+                // generating boolean actions with `true` since we already did our random selection
+                // of which actions to use above
+                ActionType::NearbyShare => bits.set_action(NearbyShare::from(true)),
+                ActionType::PresenceManager => bits.set_action(PresenceManager::from(true)),
+                ActionType::InstantTethering => bits.set_action(InstantTethering::from(true)),
+                ActionType::PhoneHub => bits.set_action(PhoneHub::from(true)),
+                ActionType::Finder | ActionType::FastPairSass => {
+                    unreachable!("not ciphertext actions")
+                }
+            }
+        }
+
+        ActionsDataElement::from(bits)
+    }
+}
+
+impl distributions::Distribution<TxPower> for distributions::Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> TxPower {
+        let tx_power: i8 = rng.gen_range(-100..=20);
+        TxPower::try_from(tx_power).unwrap()
+    }
+}
+
+impl distributions::Distribution<TxPowerDataElement> for distributions::Standard {
+    fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> TxPowerDataElement {
+        let tx_power: TxPower = self.sample(rng);
+        TxPowerDataElement::from(tx_power)
+    }
+}
+
+/// Generate a random instance of the requested DE and return it wrapped in [PlainDataElement] along
+/// with its bundle representation.
+pub(crate) fn rand_de_and_bundle<F, D, E, R>(
+    to_enum: E,
+    rng: &mut R,
+) -> (PlainDataElement<F>, DataElementBundle<F>)
+where
+    F: PacketFlavor,
+    D: ToDataElementBundle<F>,
+    E: Fn(D) -> PlainDataElement<F>,
+    R: rand::Rng,
+    distributions::Standard: distributions::Distribution<D>,
+{
+    let de = rng.gen::<D>();
+    let bundle = de.to_de_bundle();
+    (to_enum(de), bundle)
+}
+
+/// Generate a random instance of the requested de type, or `None` if that type does not support
+/// plaintext.
+pub(crate) fn random_de_plaintext<R>(
+    de_type: PlainDataElementType,
+    rng: &mut R,
+) -> Option<(PlainDataElement<Plaintext>, DataElementBundle<Plaintext>)>
+where
+    R: rand::Rng,
+{
+    let opt = match de_type {
+        PlainDataElementType::TxPower => Some(rand_de_and_bundle(PlainDataElement::TxPower, rng)),
+        PlainDataElementType::Actions => Some(rand_de_and_bundle(PlainDataElement::Actions, rng)),
+    };
+
+    // make sure flavor support is consistent
+    assert_eq!(opt.is_some(), de_type.supports_flavor(PacketFlavorEnum::Plaintext));
+
+    opt
+}
+
+/// Generate a random instance of the requested de type, or `None` if that type does not support
+/// ciphertext.
+pub(crate) fn random_de_ciphertext<R>(
+    de_type: PlainDataElementType,
+    rng: &mut R,
+) -> Option<(PlainDataElement<Ciphertext>, DataElementBundle<Ciphertext>)>
+where
+    R: rand::Rng,
+{
+    let opt = match de_type {
+        PlainDataElementType::TxPower => Some(rand_de_and_bundle(PlainDataElement::TxPower, rng)),
+        PlainDataElementType::Actions => Some(rand_de_and_bundle(PlainDataElement::Actions, rng)),
+    };
+
+    // make sure flavor support is consistent
+    assert_eq!(opt.is_some(), de_type.supports_flavor(PacketFlavorEnum::Ciphertext));
+
+    opt
+}
diff --git a/nearby/presence/np_adv/src/legacy/serialize/mod.rs b/nearby/presence/np_adv/src/legacy/serialize/mod.rs
new file mode 100644
index 0000000..38e46e1
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/serialize/mod.rs
@@ -0,0 +1,402 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Serialization for V0 advertisements.
+//!
+//! # Examples
+//!
+//! Serializing a plaintext advertisement:
+//!
+//! ```
+//! use np_adv::{legacy::{data_elements::*, serialize::*}, shared_data::*, PublicIdentity};
+//! use np_adv::shared_data::TxPower;
+//!
+//! let mut builder = AdvBuilder::new(PublicIdentity::default());
+//! builder
+//!     .add_data_element(TxPowerDataElement::from(TxPower::try_from(3).expect("3 is a valid TxPower value")))
+//!     .unwrap();
+//! let packet = builder.into_advertisement().unwrap();
+//! assert_eq!(
+//!     &[
+//!         0x00, // Adv Header
+//!         0x03, // Public DE header
+//!         0x15, 0x03, // tx power de
+//!     ],
+//!     packet.as_slice()
+//! );
+//! ```
+//!
+//! Serializing an encrypted advertisement:
+//!
+//! ```
+//! use np_adv::{shared_data::*, de_type::*, legacy::{de_type::*, data_elements::*, serialize::*}};
+//! use crypto_provider::CryptoProvider;
+//! use crypto_provider_default::CryptoProviderImpl;
+//! use ldt_np_adv::{salt_padder, LegacySalt, LdtEncrypterXtsAes128};
+//!
+//! // Generate these from proper CSPRNGs -- using fixed data here
+//! let metadata_key = [0x33; 14];
+//! let salt = LegacySalt::from([0x01, 0x02]);
+//! let key_seed = [0x44; 32];
+//! let ldt_enc = LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(
+//!     &np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed).legacy_ldt_key()
+//! );
+//!
+//! let mut builder = AdvBuilder::new(LdtIdentity::<CryptoProviderImpl>::new(
+//!     EncryptedIdentityDataElementType::Private,
+//!     salt,
+//!     metadata_key,
+//!     ldt_enc,
+//! ));
+//!
+//! builder
+//!     .add_data_element(TxPowerDataElement::from(TxPower::try_from(3).expect("3 is a valid TxPower value")))
+//!     .unwrap();
+//!
+//! let packet = builder.into_advertisement().unwrap();
+//! ```
+use crate::{
+    de_type::{EncryptedIdentityDataElementType, IdentityDataElementType},
+    legacy::{
+        de_type::{DataElementType, DeActualLength, DeEncodedLength, PlainDataElementType},
+        Ciphertext, PacketFlavor, Plaintext, BLE_ADV_SVC_CONTENT_LEN, NP_MAX_DE_CONTENT_LEN,
+    },
+    DeLengthOutOfRange, NoIdentity, PublicIdentity,
+};
+use array_view::ArrayView;
+use core::{convert, fmt, marker};
+use crypto_provider::CryptoProvider;
+use ldt_np_adv::NP_LEGACY_METADATA_KEY_LEN;
+
+#[cfg(test)]
+mod tests;
+
+/// An identity used in serializing an advertisement.
+pub trait Identity: fmt::Debug {
+    /// The flavor of packet this identity produces
+    type Flavor: PacketFlavor;
+    /// The error returned if postprocessing fails
+    type Error: fmt::Debug;
+    /// How much space needs to be reserved for this identity's prefix bytes
+    const OVERHEAD_LEN: usize;
+
+    /// Perform identity-specific manipulation to the serialized DEs to produce the final
+    /// advertisement format.
+    ///
+    /// `buf` is `OVERHEAD_LEN` bytes set aside for the identity's use, followed by all of the DEs
+    /// added to a packet. It does not include the NP top level header.
+    ///
+    /// Returns `Ok` if postprocessing was successful and the packet is finished, or `Err` if
+    /// postprocessing failed and the packet should be discarded.
+    fn postprocess(&self, buf: &mut [u8]) -> Result<(), Self::Error>;
+}
+
+lazy_static::lazy_static! {
+    // Avoid either a panic-able code path or an error case that never happens by precalculating.
+    static ref PUBLIC_IDENTITY_DE_HEADER: u8 =
+        encode_de_header_actual_len(DataElementType::PublicIdentity, DeActualLength::ZERO).unwrap();
+}
+
+impl Identity for PublicIdentity {
+    type Flavor = Plaintext;
+    type Error = convert::Infallible;
+    // 1 byte for public DE header (0 content)
+    const OVERHEAD_LEN: usize = 1;
+
+    fn postprocess(&self, buf: &mut [u8]) -> Result<(), Self::Error> {
+        buf[0] = *PUBLIC_IDENTITY_DE_HEADER;
+
+        Ok(())
+    }
+}
+
+impl Identity for NoIdentity {
+    type Flavor = Plaintext;
+    type Error = convert::Infallible;
+    // No DE header
+    const OVERHEAD_LEN: usize = 0;
+
+    fn postprocess(&self, _buf: &mut [u8]) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+/// Identity used for encrypted packets (private, trusted, provisioned) that encrypts other DEs
+/// (as well as the metadata key).
+pub struct LdtIdentity<C: CryptoProvider> {
+    de_type: EncryptedIdentityDataElementType,
+    salt: ldt_np_adv::LegacySalt,
+    metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN],
+    ldt_enc: ldt_np_adv::LdtEncrypterXtsAes128<C>,
+    // keep C parameter alive for when A disappears into it
+    _crypto_provider: marker::PhantomData<C>,
+}
+
+// Exclude sensitive members
+impl<C: CryptoProvider> fmt::Debug for LdtIdentity<C> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "LdtIdentity {{ de_type: {:?}, salt: {:X?} }}", self.de_type, self.salt)
+    }
+}
+
+impl<C: CryptoProvider> LdtIdentity<C> {
+    /// Build an `LdtIdentity` for the provided identity, salt, metadata key, and ldt.
+    pub fn new(
+        de_type: EncryptedIdentityDataElementType,
+        salt: ldt_np_adv::LegacySalt,
+        metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN],
+        ldt_enc: ldt_np_adv::LdtEncrypterXtsAes128<C>,
+    ) -> LdtIdentity<C> {
+        LdtIdentity { de_type, salt, metadata_key, ldt_enc, _crypto_provider: marker::PhantomData }
+    }
+}
+
+impl<C: CryptoProvider> Identity for LdtIdentity<C> {
+    type Flavor = Ciphertext;
+    type Error = LdtPostprocessError;
+    // Identity DE header + salt + metadata key
+    const OVERHEAD_LEN: usize = 17;
+
+    fn postprocess(&self, buf: &mut [u8]) -> Result<(), LdtPostprocessError> {
+        let de_type = self.de_type.as_identity_data_element_type();
+        // there's space for the identity DE header byte, but we don't count that in the DE length
+        let actual_len: DeActualLength = buf
+            .len()
+            .checked_sub(1)
+            .ok_or(LdtPostprocessError::InvalidLength)
+            .and_then(|len| len.try_into().map_err(|_e| LdtPostprocessError::InvalidLength))?;
+        // header
+        buf[0] = encode_de_header_actual_len(id_de_type_as_generic_de_type(de_type), actual_len)
+            .map_err(|_e| LdtPostprocessError::InvalidLength)?;
+        buf[1..3].copy_from_slice(self.salt.bytes().as_slice());
+        buf[3..17].copy_from_slice(&self.metadata_key);
+
+        // encrypt everything after DE header and salt
+        self.ldt_enc.encrypt(&mut buf[3..], &ldt_np_adv::salt_padder::<16, C>(self.salt)).map_err(
+            |e| match e {
+                // too short, not enough DEs -- should be caught by length validation above, though
+                ldt::LdtError::InvalidLength(_) => LdtPostprocessError::InvalidLength,
+            },
+        )
+    }
+}
+
+/// Something went wrong, or preconditions were not met, during identity postprocessing.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum LdtPostprocessError {
+    /// The minimum size (2 bytes) or maximum size (6 bytes) of DE payload was not met
+    InvalidLength,
+}
+
+/// Accumulates DEs, then massages the serialized DEs with the configured identity to produce
+/// the final advertisement.
+#[derive(Debug)]
+pub struct AdvBuilder<I: Identity> {
+    /// The first byte is for the adv header, then the next I::OVERHEAD_LEN bytes are set aside for
+    /// use by [Identity::postprocess].
+    buffer: [u8; BLE_ADV_SVC_CONTENT_LEN],
+    /// How much of the buffer is consumed.
+    /// Always <= buffer length
+    len: usize,
+    identity: I,
+}
+
+impl<I: Identity> AdvBuilder<I> {
+    /// Create an empty AdvBuilder with the provided identity.
+    pub fn new(identity: I) -> AdvBuilder<I> {
+        // adv header + identity overhead
+        let len = 1 + I::OVERHEAD_LEN;
+        // check for broken identities
+        assert!(len < BLE_ADV_SVC_CONTENT_LEN);
+        AdvBuilder {
+            // conveniently the first byte is already 0, which is the correct header for v0.
+            // 3 bit version (000 since this is version 0), 5 bit reserved (also all 0)
+            buffer: [0; BLE_ADV_SVC_CONTENT_LEN],
+            len,
+            identity,
+        }
+    }
+
+    /// Add the data element to the packet buffer, if there is space.
+    pub fn add_data_element<B: ToDataElementBundle<I::Flavor>>(
+        &mut self,
+        data_element: B,
+    ) -> Result<(), AddDataElementError> {
+        let remaining = self.buffer.len() - self.len;
+        let bundle = data_element.to_de_bundle();
+        // length including header byte
+        let de_slice = bundle.contents_as_slice();
+        let de_total_len = 1 + de_slice.len();
+        if remaining < de_total_len {
+            return Err(AddDataElementError::InsufficientAdvSpace);
+        }
+
+        // header
+        self.buffer[self.len] =
+            encode_de_header(bundle.de_type.as_generic_de_type(), bundle.encoded_len);
+        self.len += 1;
+        // de contents
+        self.buffer[self.len..self.len + de_slice.len()].copy_from_slice(de_slice);
+        self.len += de_slice.len();
+        Ok(())
+    }
+
+    /// Return the finished advertisement (adv header + DEs), or `None` if the adv could not be
+    /// built.
+    pub fn into_advertisement(
+        mut self,
+    ) -> Result<ArrayView<u8, BLE_ADV_SVC_CONTENT_LEN>, I::Error> {
+        // encrypt, if applicable
+        self.identity
+            // skip adv header for postprocessing
+            .postprocess(&mut self.buffer[1..self.len])
+            .map(|_| ArrayView::try_from_array(self.buffer, self.len).expect("len is always valid"))
+    }
+}
+
+/// Errors that can occur for [AdvBuilder.add_data_element].
+#[derive(Debug, PartialEq, Eq)]
+pub enum AddDataElementError {
+    /// The provided DE can't fit in the remaining space
+    InsufficientAdvSpace,
+}
+
+/// The serialized form of a data element.
+#[derive(Clone, Debug)]
+pub struct DataElementBundle<F: PacketFlavor> {
+    de_type: PlainDataElementType,
+    /// Data element payload
+    data: DePayload,
+    /// The header-encoded form of `data`'s length
+    encoded_len: DeEncodedLength,
+    /// Type marker for whether this DE can be used in encrypted or plaintext packets.
+    flavor: marker::PhantomData<F>,
+}
+
+impl<F: PacketFlavor> DataElementBundle<F> {
+    /// Returns `Err` if the provided `data` or requested [PacketFlavor] are not valid for
+    /// `de_type`.
+    pub(crate) fn try_from(
+        de_type: PlainDataElementType,
+        data: &[u8],
+    ) -> Result<DataElementBundle<F>, DeBundleError> {
+        if !de_type.supports_flavor(F::ENUM_VARIANT) {
+            return Err(DeBundleError::InvalidFlavor);
+        }
+
+        let mut buffer = [0; NP_MAX_DE_CONTENT_LEN];
+        buffer
+            .get_mut(0..data.len())
+            .map(|dest| dest.copy_from_slice(data))
+            .ok_or(DeBundleError::InvalidLength)?;
+
+        let payload: DePayload = ArrayView::try_from_array(buffer, data.len())
+            .expect("data already copied into buffer")
+            .into();
+
+        // get the encoded length now so we know the length is valid for the DE type
+        let encoded_len = de_type
+            .as_generic_de_type()
+            .encoded_len_for_actual_len(payload.len())
+            .map_err(|_| DeBundleError::InvalidLength)?;
+
+        Ok(DataElementBundle { de_type, data: payload, encoded_len, flavor: marker::PhantomData })
+    }
+
+    /// The data contained in the DE, excluding the header byte
+    pub(crate) fn contents_as_slice(&self) -> &[u8] {
+        self.data.as_slice()
+    }
+}
+
+/// Errors that can occur when building a [DataElementBundle]
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) enum DeBundleError {
+    /// The DE type does not support the requested flavor
+    InvalidFlavor,
+    /// The data is too long to fit in a DE, or is invalid for the DE type
+    InvalidLength,
+}
+
+/// Implemented by higher-level types that represent data elements.
+pub trait ToDataElementBundle<F: PacketFlavor> {
+    /// Serialize `self` into the impl-specific byte encoding used for that DE type.
+    fn to_de_bundle(&self) -> DataElementBundle<F>;
+}
+
+// for cases where it's more convenient to already have a DataElementBundle than a DE
+impl<F: PacketFlavor> ToDataElementBundle<F> for DataElementBundle<F> {
+    fn to_de_bundle(&self) -> DataElementBundle<F> {
+        Self {
+            de_type: self.de_type,
+            data: self.data.clone(),
+            encoded_len: self.encoded_len,
+            flavor: marker::PhantomData,
+        }
+    }
+}
+
+// Biggest size a DE could possibly be is the entire payload
+#[derive(Clone, PartialEq, Eq, Debug)]
+struct DePayload {
+    payload: ArrayView<u8, { NP_MAX_DE_CONTENT_LEN }>,
+}
+
+impl DePayload {
+    /// The actual length of the payload
+    fn len(&self) -> DeActualLength {
+        self.payload
+            .len()
+            .try_into()
+            .expect("Payload is an array of the max size which always has a valid length")
+    }
+
+    fn as_slice(&self) -> &[u8] {
+        self.payload.as_slice()
+    }
+}
+
+impl From<ArrayView<u8, { NP_MAX_DE_CONTENT_LEN }>> for DePayload {
+    fn from(array: ArrayView<u8, { NP_MAX_DE_CONTENT_LEN }>) -> Self {
+        Self { payload: array }
+    }
+}
+
+/// Encode a DE type and length into a DE header byte.
+pub(crate) fn encode_de_header(de_type: DataElementType, header_len: DeEncodedLength) -> u8 {
+    // 4 high bits are length, 4 low bits are type
+    (header_len.as_u8() << 4) | de_type.type_code().as_u8()
+}
+
+/// Encode a DE type and length into a DE header byte.
+pub(crate) fn encode_de_header_actual_len(
+    de_type: DataElementType,
+    header_len: DeActualLength,
+) -> Result<u8, DeLengthOutOfRange> {
+    de_type
+        .encoded_len_for_actual_len(header_len)
+        // 4 high bits are length, 4 low bits are type
+        .map(|len| encode_de_header(de_type, len))
+}
+
+pub(crate) fn id_de_type_as_generic_de_type(
+    id_de_type: IdentityDataElementType,
+) -> DataElementType {
+    match id_de_type {
+        IdentityDataElementType::Private => DataElementType::PrivateIdentity,
+        IdentityDataElementType::Trusted => DataElementType::TrustedIdentity,
+        IdentityDataElementType::Public => DataElementType::PublicIdentity,
+        IdentityDataElementType::Provisioned => DataElementType::ProvisionedIdentity,
+    }
+}
diff --git a/nearby/presence/np_adv/src/legacy/serialize/tests.rs b/nearby/presence/np_adv/src/legacy/serialize/tests.rs
new file mode 100644
index 0000000..192b8f4
--- /dev/null
+++ b/nearby/presence/np_adv/src/legacy/serialize/tests.rs
@@ -0,0 +1,169 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate std;
+
+use crate::legacy::actions::FastPairSass;
+use crate::legacy::actions::NearbyShare;
+use crate::{
+    de_type::EncryptedIdentityDataElementType,
+    legacy::{actions::*, data_elements::*, serialize::*},
+    shared_data::TxPower,
+};
+use crypto_provider_default::CryptoProviderImpl;
+use ldt_np_adv::{salt_padder, LdtEncrypterXtsAes128, LegacySalt};
+use std::vec;
+
+#[test]
+fn public_identity_packet_serialization() {
+    let mut builder = AdvBuilder::new(PublicIdentity::default());
+
+    let tx_power = TxPower::try_from(3).unwrap();
+    let mut action = ActionBits::default();
+    action.set_action(NearbyShare::from(true));
+    builder.add_data_element(TxPowerDataElement::from(tx_power)).unwrap();
+    builder.add_data_element(ActionsDataElement::from(action)).unwrap();
+
+    let packet = builder.into_advertisement().unwrap();
+    assert_eq!(
+        &[
+            0x00, // Adv Header
+            0x03, // Public DE header
+            0x15, 0x03, // Tx Power DE with value 3
+            0x26, 0x00, 0x40, // Actions DE w/ bit 9
+        ],
+        packet.as_slice()
+    );
+}
+
+#[test]
+fn no_identity_packet_serialization() {
+    let mut builder = AdvBuilder::new(NoIdentity::default());
+
+    let tx_power = TxPower::try_from(3).unwrap();
+    let mut action = ActionBits::default();
+    action.set_action(NearbyShare::from(true));
+    builder.add_data_element(TxPowerDataElement::from(tx_power)).unwrap();
+    builder.add_data_element(ActionsDataElement::from(action)).unwrap();
+
+    let packet = builder.into_advertisement().unwrap();
+    assert_eq!(
+        &[
+            0x00, // Adv Header
+            0x15, 0x03, // Tx Power DE with value 3
+            0x26, 0x00, 0x40, // Actions DE w/ bit 9
+        ],
+        packet.as_slice()
+    );
+}
+
+#[test]
+fn packet_limits_capacity() {
+    let mut builder = AdvBuilder::new(PublicIdentity::default());
+    // 2 + 1 left out of 24 payload bytes
+    builder.len = 21;
+    let mut bits = ActionBits::default();
+    bits.set_action(NearbyShare::from(true));
+    bits.set_action(FastPairSass::from(true));
+
+    assert_eq!(Ok(()), builder.add_data_element(ActionsDataElement::from(bits)));
+
+    // too small for 2+ 1 DE
+    builder.len = 22;
+    assert_eq!(
+        Err(AddDataElementError::InsufficientAdvSpace),
+        builder.add_data_element(ActionsDataElement::from(bits))
+    );
+}
+
+#[test]
+fn ldt_packet_serialization() {
+    // don't care about the HMAC since we're not decrypting
+    let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&[0; 32]);
+    let ldt = LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(&hkdf.legacy_ldt_key());
+    let metadata_key = [0x33; 14];
+    let salt = LegacySalt::from([0x01, 0x02]);
+
+    let mut ciphertext = vec![];
+    ciphertext.extend_from_slice(&metadata_key);
+    // tx power & action DEs
+    ciphertext.extend_from_slice(&[0x15, 0x03, 0x26, 0x00, 0x10]);
+    ldt.encrypt(&mut ciphertext, &salt_padder::<16, CryptoProviderImpl>(salt)).unwrap();
+
+    let mut builder = AdvBuilder::new(LdtIdentity::<CryptoProviderImpl>::new(
+        EncryptedIdentityDataElementType::Private,
+        salt,
+        metadata_key,
+        ldt,
+    ));
+
+    let tx_power = TxPower::try_from(3).unwrap();
+    let mut action = ActionBits::default();
+    action.set_action(PhoneHub::from(true));
+    builder.add_data_element(TxPowerDataElement::from(tx_power)).unwrap();
+    builder.add_data_element(ActionsDataElement::from(action)).unwrap();
+
+    let packet = builder.into_advertisement().unwrap();
+    // header
+    let mut expected = vec![0x00];
+    // private header with five bytes after it
+    expected.push(0x51);
+    expected.extend_from_slice(salt.bytes());
+    expected.extend_from_slice(&ciphertext);
+    assert_eq!(&expected, packet.as_slice());
+}
+
+#[test]
+fn ldt_packet_cant_encrypt_without_des() {
+    let metadata_key = [0x33; 14];
+    let salt = LegacySalt::from([0x01, 0x02]);
+
+    let builder = AdvBuilder::new(LdtIdentity::<CryptoProviderImpl>::new(
+        EncryptedIdentityDataElementType::Private,
+        salt,
+        metadata_key,
+        LdtEncrypterXtsAes128::<CryptoProviderImpl>::new(
+            &np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&[0xFE; 32]).legacy_ldt_key(),
+        ),
+    ));
+
+    // not enough ciphertext
+    assert_eq!(Err(LdtPostprocessError::InvalidLength), builder.into_advertisement());
+}
+
+#[test]
+fn nearby_share_action() {
+    let mut builder = AdvBuilder::new(PublicIdentity::default());
+
+    let mut action = ActionBits::default();
+    action.set_action(NearbyShare::from(true));
+
+    let actions_de = ActionsDataElement::from(action);
+    builder.add_data_element(actions_de).unwrap();
+
+    let tx_power_de = TxPowerDataElement::from(TxPower::try_from(-100).unwrap());
+    builder.add_data_element(tx_power_de).unwrap();
+
+    assert_eq!(
+        &[
+            0x00, // version 0
+            0x03, // public identity
+            0x26, // length 2, DE type 6 for actions
+            0x00, 0x40, // bit 9 is active
+            0x15, // length 1, DE type 5 for tx power
+            0x9C, // tx power of -100
+        ],
+        builder.into_advertisement().unwrap().as_slice()
+    );
+}
diff --git a/nearby/presence/np_adv/src/lib.rs b/nearby/presence/np_adv/src/lib.rs
new file mode 100644
index 0000000..a6a155e
--- /dev/null
+++ b/nearby/presence/np_adv/src/lib.rs
@@ -0,0 +1,534 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Serialization and deserialization for v0 (legacy) and v1 (extended) Nearby Presence
+//! advertisements.
+//!
+//! See `tests/examples_v0.rs` and `tests/examples_v1.rs` for some tests that show common
+//! deserialization scenarios.
+
+#![no_std]
+#![forbid(unsafe_code)]
+#![deny(missing_docs)]
+
+extern crate alloc;
+extern crate core;
+use crate::{
+    credential::{
+        source::{BothCredentialSource, CredentialSource},
+        v0::V0CryptoMaterial,
+        MatchedCredFromCred, MatchedCredential, V0Credential, V1Credential,
+    },
+    extended::deserialize::{
+        parse_sections, CiphertextSection, DataElements, DecryptedSection, IntermediateSection,
+        PlaintextSection, Section, SectionDeserializeError,
+    },
+    legacy::deserialize::{
+        DecryptError, DecryptedAdvContents, IntermediateAdvContents, PlaintextAdvContents,
+    },
+};
+use alloc::vec::Vec;
+#[cfg(feature = "devtools")]
+use array_view::ArrayView;
+use core::{fmt::Debug, marker};
+use crypto_provider::CryptoProvider;
+#[cfg(feature = "devtools")]
+use extended::NP_ADV_MAX_SECTION_LEN;
+use legacy::{data_elements::DataElementDeserializeError, deserialize::AdvDeserializeError};
+use nom::{combinator, number};
+pub mod credential;
+pub mod de_type;
+#[cfg(test)]
+mod deser_v0_tests;
+#[cfg(test)]
+mod deser_v1_tests;
+pub mod extended;
+#[cfg(test)]
+mod header_parse_tests;
+pub mod legacy;
+pub mod shared_data;
+/// Canonical form of NP's service UUID.
+///
+/// Note that UUIDs are encoded in BT frames in little-endian order, so these bytes may need to be
+/// reversed depending on the host BT API.
+pub const NP_SVC_UUID: [u8; 2] = [0xFC, 0xF1];
+
+/// Parse, deserialize, decrypt, and validate a complete NP advertisement (the entire contents of
+/// the service data for the NP UUID).
+pub fn deserialize_advertisement<'s, C0, C1, M, S, P>(
+    adv: &[u8],
+    cred_source: &'s S,
+) -> Result<DeserializedAdvertisement<'s, M>, AdvDeserializationError>
+where
+    C0: V0Credential<Matched<'s> = M> + 's,
+    C1: V1Credential<Matched<'s> = M> + 's,
+    M: MatchedCredential<'s>,
+    S: BothCredentialSource<C0, C1>,
+    P: CryptoProvider,
+{
+    let (remaining, header) =
+        parse_adv_header(adv).map_err(|_e| AdvDeserializationError::HeaderParseError)?;
+    match header {
+        AdvHeader::V1(header) => {
+            deser_decrypt_v1::<C1, S::V1Source, P>(cred_source.v1(), remaining, header)
+                .map(DeserializedAdvertisement::V1)
+        }
+        AdvHeader::V0 => deser_decrypt_v0::<C0, S::V0Source, P>(cred_source.v0(), remaining)
+            .map(DeserializedAdvertisement::V0),
+    }
+}
+
+/// Parse, deserialize, decrypt, and validate a complete V0 NP advertisement (the entire contents
+/// of the service data for the NP UUID). If the advertisement version header does not match V0,
+/// this method will return an [`AdvDeserializationError::HeaderParseError`]
+pub fn deserialize_v0_advertisement<'s, C, S, P>(
+    adv: &[u8],
+    cred_source: &'s S,
+) -> Result<V0AdvertisementContents<'s, C>, AdvDeserializationError>
+where
+    C: V0Credential,
+    S: CredentialSource<C>,
+    P: CryptoProvider,
+{
+    let (remaining, header) =
+        parse_adv_header(adv).map_err(|_e| AdvDeserializationError::HeaderParseError)?;
+
+    match header {
+        AdvHeader::V0 => deser_decrypt_v0::<C, S, P>(cred_source, remaining),
+        AdvHeader::V1(_) => Err(AdvDeserializationError::HeaderParseError),
+    }
+}
+
+/// Parse, deserialize, decrypt, and validate a complete V1 NP advertisement (the entire contents
+/// of the service data for the NP UUID). If the advertisement version header does not match V1,
+/// this method will return an [`AdvDeserializationError::HeaderParseError`]
+pub fn deserialize_v1_advertisement<'s, C, S, P>(
+    adv: &[u8],
+    cred_source: &'s S,
+) -> Result<V1AdvertisementContents<'s, C>, AdvDeserializationError>
+where
+    C: V1Credential,
+    S: CredentialSource<C>,
+    P: CryptoProvider,
+{
+    let (remaining, header) =
+        parse_adv_header(adv).map_err(|_e| AdvDeserializationError::HeaderParseError)?;
+
+    match header {
+        AdvHeader::V0 => Err(AdvDeserializationError::HeaderParseError),
+        AdvHeader::V1(header) => deser_decrypt_v1::<C, S, P>(cred_source, remaining, header),
+    }
+}
+
+type V1AdvertisementContents<'s, C> = V1AdvContents<'s, MatchedCredFromCred<'s, C>>;
+
+/// The encryption scheme used for a V1 advertisement.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum V1EncryptionScheme {
+    /// Indicates MIC-based encryption and verification.
+    Mic,
+    /// Indicates signature-based encryption and verification.
+    Signature,
+}
+
+/// Error in decryption operations for `deser_decrypt_v1_section_bytes_for_dev_tools`.
+#[cfg(feature = "devtools")]
+#[derive(Debug, Clone)]
+pub enum AdvDecryptionError {
+    /// Cannot decrypt because the input section is not encrypted.
+    InputNotEncrypted,
+    /// Error parsing the given section.
+    ParseError,
+    /// No suitable credential found to decrypt the given section.
+    NoMatchingCredentials,
+}
+
+/// Decrypt, but do not further deserialize the v1 bytes, intended for developer tooling uses only.
+/// Production uses should use [deserialize_v1_advertisement] instead, which deserializes to a
+/// structured format and provides extra type safety.
+#[cfg(feature = "devtools")]
+pub fn deser_decrypt_v1_section_bytes_for_dev_tools<S, V1, P>(
+    cred_source: &S,
+    header_byte: u8,
+    section_bytes: &[u8],
+) -> Result<(ArrayView<u8, NP_ADV_MAX_SECTION_LEN>, V1EncryptionScheme), AdvDecryptionError>
+where
+    S: CredentialSource<V1>,
+    V1: V1Credential,
+    P: CryptoProvider,
+{
+    let header = V1Header { header_byte };
+    let int_sections =
+        parse_sections(&header, section_bytes).map_err(|_| AdvDecryptionError::ParseError)?;
+    let cipher_section = match &int_sections[0] {
+        IntermediateSection::Plaintext(_) => Err(AdvDecryptionError::InputNotEncrypted)?,
+        IntermediateSection::Ciphertext(section) => section,
+    };
+
+    use crate::credential::v1::V1CryptoMaterial;
+    use core::borrow::Borrow;
+
+    for cred in cred_source.iter() {
+        let crypto_material = cred.crypto_material();
+
+        match cipher_section {
+            CiphertextSection::SignatureEncryptedIdentity(encrypted_section) => {
+                let identity_resolution_material =
+                    crypto_material.signed_identity_resolution_material::<P>();
+                match encrypted_section.try_decrypt::<P>(identity_resolution_material.borrow()) {
+                    Ok(plaintext) => return Ok((plaintext, V1EncryptionScheme::Signature)),
+                    Err(_) => continue,
+                }
+            }
+            CiphertextSection::MicEncryptedIdentity(encrypted_section) => {
+                let identity_resolution_material =
+                    crypto_material.unsigned_identity_resolution_material::<P>();
+                let verification_material = crypto_material.unsigned_verification_material::<P>();
+                match encrypted_section
+                    .try_decrypt::<P>(identity_resolution_material.borrow(), &verification_material)
+                {
+                    Ok(plaintext) => return Ok((plaintext, V1EncryptionScheme::Mic)),
+                    Err(_) => continue,
+                }
+            }
+        }
+    }
+    Err(AdvDecryptionError::NoMatchingCredentials)
+}
+
+/// Deserialize and decrypt the contents of a v1 adv after the version header
+fn deser_decrypt_v1<'s, C, S, P>(
+    cred_source: &'s S,
+    remaining: &[u8],
+    header: V1Header,
+) -> Result<V1AdvertisementContents<'s, C>, AdvDeserializationError>
+where
+    C: V1Credential,
+    S: CredentialSource<C>,
+    P: CryptoProvider,
+{
+    let int_sections =
+        parse_sections(&header, remaining).map_err(|_| AdvDeserializationError::ParseError {
+            details_hazmat: AdvDeserializationErrorDetailsHazmat::AdvertisementDeserializeError,
+        })?;
+    let mut sections = Vec::new();
+    let mut to_decrypt = Vec::new();
+    // keep track of ordering for later sorting
+    for (idx, s) in int_sections.into_iter().enumerate() {
+        match s {
+            IntermediateSection::Plaintext(p) => {
+                sections.push((idx, V1DeserializedSection::Plaintext(p)))
+            }
+            IntermediateSection::Ciphertext(c) => to_decrypt.push((idx, c)),
+        }
+    }
+    let mut invalid_sections = 0;
+    // Hot loop
+    // We assume that iterating credentials is more expensive than iterating sections
+    for cred in cred_source.iter() {
+        let mut i = 0;
+        while i < to_decrypt.len() {
+            let (section_idx, c): &(usize, CiphertextSection) = &to_decrypt[i];
+            match c.try_deserialize::<C, P>(cred) {
+                Ok(s) => {
+                    sections.push((
+                        *section_idx,
+                        V1DeserializedSection::Decrypted(WithMatchedCredential::new(
+                            cred.matched(),
+                            s,
+                        )),
+                    ));
+                    // we don't care about maintaining order, so use O(1) remove
+                    to_decrypt.swap_remove(i);
+                    // don't advance i -- it now points to a new element
+                }
+                Err(e) => match e {
+                    SectionDeserializeError::IncorrectCredential => {
+                        // keep it around to try with another credential
+                        i += 1;
+                    }
+                    SectionDeserializeError::ParseError => {
+                        // the credential worked, but the section itself was bogus, so drop
+                        // it
+                        invalid_sections += 1;
+                        to_decrypt.swap_remove(i);
+                    }
+                },
+            }
+        }
+        if to_decrypt.is_empty() {
+            // no need to consider the remaining credentials
+            break;
+        }
+    }
+    invalid_sections += to_decrypt.len();
+    // decryption may produce sections out of order
+    sections.sort_by_key(|(idx, _section)| *idx);
+    Ok(V1AdvContents::new(sections.into_iter().map(|(_idx, s)| s).collect(), invalid_sections))
+}
+
+type V0AdvertisementContents<'s, C> = V0AdvContents<'s, MatchedCredFromCred<'s, C>>;
+
+/// Deserialize and decrypt the contents of a v0 adv after the version header
+fn deser_decrypt_v0<'s, C, S, P>(
+    cred_source: &'s S,
+    remaining: &[u8],
+) -> Result<V0AdvertisementContents<'s, C>, AdvDeserializationError>
+where
+    C: V0Credential,
+    S: CredentialSource<C>,
+    P: CryptoProvider,
+{
+    let contents = legacy::deserialize::deserialize_adv_contents::<P>(remaining)?;
+    return match contents {
+        IntermediateAdvContents::Plaintext(p) => Ok(V0AdvContents::Plaintext(p)),
+        IntermediateAdvContents::Ciphertext(c) => {
+            for cred in cred_source.iter() {
+                let cm = cred.crypto_material();
+                let ldt = cm.ldt_adv_cipher::<P>();
+                match c.try_decrypt(&ldt) {
+                    Ok(c) => {
+                        return Ok(V0AdvContents::Decrypted(WithMatchedCredential::new(
+                            cred.matched(),
+                            c,
+                        )))
+                    }
+                    Err(e) => match e {
+                        DecryptError::DecryptOrVerifyError => continue,
+                        DecryptError::DeserializeError(e) => {
+                            return Err(e.into());
+                        }
+                    },
+                }
+            }
+            Ok(V0AdvContents::NoMatchingCredentials)
+        }
+    };
+}
+/// Parse a NP advertisement header.
+///
+/// This can be used on all versions of advertisements since it's the header that determines the
+/// version.
+///
+/// Returns a `nom::IResult` with the parsed header and the remaining bytes of the advertisement.
+fn parse_adv_header(adv: &[u8]) -> nom::IResult<&[u8], AdvHeader> {
+    // header bits: VVVxxxxx
+    let (remaining, (header_byte, version, _low_bits)) = combinator::verify(
+        // splitting a byte at a bit boundary to take lower 5 bits
+        combinator::map(number::complete::u8, |byte| (byte, byte >> 5, byte & 0x1F)),
+        |&(_header_byte, version, low_bits)| match version {
+            // reserved bits, for any version, must be zero
+            PROTOCOL_VERSION_LEGACY | PROTOCOL_VERSION_EXTENDED => low_bits == 0,
+            _ => false,
+        },
+    )(adv)?;
+    match version {
+        PROTOCOL_VERSION_LEGACY => Ok((remaining, AdvHeader::V0)),
+        PROTOCOL_VERSION_EXTENDED => Ok((remaining, AdvHeader::V1(V1Header { header_byte }))),
+        _ => unreachable!(),
+    }
+}
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub(crate) enum AdvHeader {
+    V0,
+    V1(V1Header),
+}
+/// An NP advertisement with its header parsed.
+#[derive(Debug, PartialEq, Eq)]
+pub enum DeserializedAdvertisement<'m, M: MatchedCredential<'m>> {
+    /// V0 header has all reserved bits, so there is no data to represent other than the version
+    /// itself.
+    V0(V0AdvContents<'m, M>),
+    /// V1 advertisement
+    V1(V1AdvContents<'m, M>),
+}
+/// The contents of a deserialized and decrypted V1 advertisement.
+#[derive(Debug, PartialEq, Eq)]
+pub struct V1AdvContents<'m, M: MatchedCredential<'m>> {
+    sections: Vec<V1DeserializedSection<'m, M>>,
+    invalid_sections: usize,
+}
+impl<'m, M: MatchedCredential<'m>> V1AdvContents<'m, M> {
+    fn new(sections: Vec<V1DeserializedSection<'m, M>>, invalid_sections: usize) -> Self {
+        Self { sections, invalid_sections }
+    }
+    /// Destructures this V1 advertisement into just the sections
+    /// which could be successfully deserialized and decrypted
+    pub fn into_valid_sections(self) -> Vec<V1DeserializedSection<'m, M>> {
+        self.sections
+    }
+    /// The sections that could be successfully deserialized and decrypted
+    pub fn sections(&self) -> impl Iterator<Item = &V1DeserializedSection<M>> {
+        self.sections.iter()
+    }
+    /// The number of sections that could not be parsed or decrypted.
+    pub fn invalid_sections_count(&self) -> usize {
+        self.invalid_sections
+    }
+}
+/// Advertisement content that was either already plaintext or has been decrypted.
+#[derive(Debug, PartialEq, Eq)]
+pub enum V0AdvContents<'m, M: MatchedCredential<'m>> {
+    /// Contents of an originally plaintext advertisement
+    Plaintext(PlaintextAdvContents),
+    /// Contents that was ciphertext in the original advertisement, and has been decrypted
+    /// with the credential in the [MatchedCredential]
+    Decrypted(WithMatchedCredential<'m, M, DecryptedAdvContents>),
+    /// The advertisement was encrypted, but no credentials matched
+    NoMatchingCredentials,
+}
+/// Advertisement content that was either already plaintext or has been decrypted.
+#[derive(Debug, PartialEq, Eq)]
+pub enum V1DeserializedSection<'m, M: MatchedCredential<'m>> {
+    /// Section that was plaintext in the original advertisement
+    Plaintext(PlaintextSection),
+    /// Section that was ciphertext in the original advertisement, and has been decrypted
+    /// with the credential in the [MatchedCredential]
+    Decrypted(WithMatchedCredential<'m, M, DecryptedSection>),
+}
+impl<'m, M> Section for V1DeserializedSection<'m, M>
+where
+    M: MatchedCredential<'m>,
+{
+    type Iterator<'d>  = DataElements<'d> where Self: 'd;
+    fn data_elements(&'_ self) -> Self::Iterator<'_> {
+        match self {
+            V1DeserializedSection::Plaintext(p) => p.data_elements(),
+            V1DeserializedSection::Decrypted(d) => d.contents.data_elements(),
+        }
+    }
+}
+/// Decrypted advertisement content with the [MatchedCredential] from the credential that decrypted
+/// it.
+#[derive(Debug, PartialEq, Eq)]
+pub struct WithMatchedCredential<'m, M: MatchedCredential<'m>, T> {
+    matched: M,
+    contents: T,
+    // the compiler sees 'm as unused
+    marker: marker::PhantomData<&'m ()>,
+}
+impl<'m, M: MatchedCredential<'m>, T> WithMatchedCredential<'m, M, T> {
+    fn new(matched: M, contents: T) -> Self {
+        Self { matched, contents, marker: marker::PhantomData }
+    }
+    /// Credential data for the credential that decrypted the content.
+    pub fn matched_credential(&self) -> &M {
+        &self.matched
+    }
+    /// The decrypted advertisement content.
+    pub fn contents(&self) -> &T {
+        &self.contents
+    }
+}
+/// Data in a V1 advertisement header.
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub(crate) struct V1Header {
+    header_byte: u8,
+}
+const PROTOCOL_VERSION_LEGACY: u8 = 0;
+const PROTOCOL_VERSION_EXTENDED: u8 = 1;
+
+/// Errors that can occur during advertisement deserialization.
+#[derive(PartialEq)]
+pub enum AdvDeserializationError {
+    /// The advertisement header could not be parsed
+    HeaderParseError,
+    /// The advertisement content could not be parsed
+    ParseError {
+        /// Potentially hazardous details about deserialization errors. Read the documentation for
+        /// [AdvDeserializationErrorDetailsHazmat] before using this field.
+        details_hazmat: AdvDeserializationErrorDetailsHazmat,
+    },
+}
+
+impl Debug for AdvDeserializationError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match self {
+            AdvDeserializationError::HeaderParseError => write!(f, "HeaderParseError"),
+            AdvDeserializationError::ParseError { .. } => write!(f, "ParseError"),
+        }
+    }
+}
+
+/// Potentially hazardous details about deserialization errors. These error information can
+/// potentially expose side-channel information about the plaintext of the advertisements and/or
+/// the keys used to decrypt them. For any place that you avoid exposing the keys directly
+/// (e.g. across FFIs, print to log, etc), avoid exposing these error details as well.
+#[derive(PartialEq)]
+pub enum AdvDeserializationErrorDetailsHazmat {
+    /// Parsing the overall advertisement or DE structure failed
+    AdvertisementDeserializeError,
+    /// Deserializing an individual DE from its DE contents failed
+    V0DataElementDeserializeError(DataElementDeserializeError),
+    /// Must not have any other top level data elements if there is an encrypted identity DE
+    TooManyTopLevelDataElements,
+    /// Must not have an identity DE inside an identity DE
+    InvalidDataElementHierarchy,
+}
+
+impl From<AdvDeserializeError> for AdvDeserializationError {
+    fn from(err: AdvDeserializeError) -> Self {
+        match err {
+            AdvDeserializeError::AdvertisementDeserializeError => {
+                AdvDeserializationError::ParseError {
+                    details_hazmat:
+                        AdvDeserializationErrorDetailsHazmat::AdvertisementDeserializeError,
+                }
+            }
+            AdvDeserializeError::DataElementDeserializeError(e) => {
+                AdvDeserializationError::ParseError {
+                    details_hazmat:
+                        AdvDeserializationErrorDetailsHazmat::V0DataElementDeserializeError(e),
+                }
+            }
+            AdvDeserializeError::TooManyTopLevelDataElements => {
+                AdvDeserializationError::ParseError {
+                    details_hazmat:
+                        AdvDeserializationErrorDetailsHazmat::TooManyTopLevelDataElements,
+                }
+            }
+            AdvDeserializeError::InvalidDataElementHierarchy => {
+                AdvDeserializationError::ParseError {
+                    details_hazmat:
+                        AdvDeserializationErrorDetailsHazmat::InvalidDataElementHierarchy,
+                }
+            }
+        }
+    }
+}
+
+/// DE length is out of range (e.g. > 4 bits for encoded V0, > max DE size for actual V0, >127 for
+/// V1) or invalid for the relevant DE type.
+#[derive(Debug, PartialEq, Eq)]
+pub struct DeLengthOutOfRange;
+
+/// The identity mode for a deserialized plaintext section or advertisement.
+#[derive(PartialEq, Eq, Debug, Clone, Copy)]
+pub enum PlaintextIdentityMode {
+    /// No identity DE was present in the section
+    None,
+    /// A "Public Identity" DE was present in the section
+    Public,
+}
+
+/// A "public identity" -- a nonspecific "empty identity".
+///
+/// Used when serializing V0 advertisements or V1 sections.
+#[derive(Default, Debug)]
+pub struct PublicIdentity {}
+
+/// The lack of any identity information whatsoever, which is distinct from [PublicIdentity].
+///
+/// Used when serializing V0 advertisements or V1 sections.
+#[derive(Default, Debug)]
+pub struct NoIdentity {}
diff --git a/nearby/presence/np_adv/src/shared_data.rs b/nearby/presence/np_adv/src/shared_data.rs
new file mode 100644
index 0000000..b511ed2
--- /dev/null
+++ b/nearby/presence/np_adv/src/shared_data.rs
@@ -0,0 +1,77 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Data types shared between V0 and V1 advertisements
+
+/// Power in dBm, calibrated as per
+/// [Eddystone](https://github.com/google/eddystone/tree/master/eddystone-uid#tx-power)
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub struct TxPower {
+    /// Power in `[-100, 20]`
+    power: i8,
+}
+
+impl TxPower {
+    /// Power in `[-100, 20]`
+    pub fn as_i8(&self) -> i8 {
+        self.power
+    }
+}
+
+impl TryFrom<i8> for TxPower {
+    type Error = TxPowerOutOfRange;
+
+    fn try_from(value: i8) -> Result<Self, Self::Error> {
+        if !(-100..=20).contains(&value) {
+            Err(TxPowerOutOfRange)
+        } else {
+            Ok(TxPower { power: value })
+        }
+    }
+}
+
+/// Tx power was out of the valid range `[-100, 20]`.
+#[derive(Debug)]
+pub struct TxPowerOutOfRange;
+
+/// MDP's context sync number, used to inform other devices that they have stale context.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub struct ContextSyncSeqNum {
+    /// 4-bit sequence
+    num: u8,
+}
+
+impl ContextSyncSeqNum {
+    /// Returns the context seq num as a u8
+    pub fn as_u8(&self) -> u8 {
+        self.num
+    }
+}
+
+impl TryFrom<u8> for ContextSyncSeqNum {
+    type Error = ContextSyncSeqNumOutOfRange;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        // must only have low nibble
+        if value > 0x0F {
+            Err(ContextSyncSeqNumOutOfRange)
+        } else {
+            Ok(ContextSyncSeqNum { num: value })
+        }
+    }
+}
+
+/// Seq num must be in `[0-15]`.
+#[derive(Debug)]
+pub struct ContextSyncSeqNumOutOfRange;
diff --git a/nearby/presence/np_adv/test.json b/nearby/presence/np_adv/test.json
new file mode 100644
index 0000000..953eebf
--- /dev/null
+++ b/nearby/presence/np_adv/test.json
@@ -0,0 +1,24122 @@
+[
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "8CDE04CBC59C9134F37B1FFBCF5C1136",
+    "aes_key": "0C04AAE1338E928EA903CAF2FD806749",
+    "data_elements": [
+      {
+        "contents": "3DF2D0883246D50B5C981ADB",
+        "de_type": 163
+      },
+      {
+        "contents": "5628511D93E01312D69F5484",
+        "de_type": 317
+      },
+      {
+        "contents": "C255FFF1D4F8501E3467B084BDD124DF26",
+        "de_type": 721
+      }
+    ],
+    "encoded_section": "69901356E7F8215A0B45D559EFD0EE88A6398B911000C807A0FFE7C79ABD61B1862AFBD097AF9001D042A9F585F02B4DE34C7412A717A08034ECDC1862BB599B6CD7CD3F95D191135555C01A0D1A71EBF2593213E9439552D625736E024EADFA950BA7B78D6AD844AD0A",
+    "identity_type": "private",
+    "iv": "2170459EF8C3E6DB3BFB808B62A5D03E",
+    "key_seed": "43A340DE5AFC350888FB696FC77D8CB0467668F18E7EDCB8CC3AC2F59F075ACB",
+    "metadata_key": "593580A4B65DEF1E6B117C8055CB6257",
+    "section_mic_hmac_key": "CDB8526FA8BEC42B51495EEA23F347B2F8E07A757DF63FE9C5C9100E8EB39435",
+    "section_salt": "C807A0FFE7C79ABD61B1862AFBD097AF"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "8630E9D33F2AB78558BB4AF5C09F4C9E",
+    "aes_key": "E9FE3EF4069698F338256E23AAC08029",
+    "data_elements": [
+      {
+        "contents": "C70548D64F0D131D8551D3C2B3",
+        "de_type": 448
+      },
+      {
+        "contents": "E4EAA94038A8B4A0D46C83695DABC05262C7DA5ED2395B673527C5C337",
+        "de_type": 859
+      }
+    ],
+    "encoded_section": "6790134C7B6E97BE50C21ADAEE4D5EC611313B911000A6C0ECE0A9D25663F329C6C218D07CB59004603C46143E88C0F872F341BE2C06FB4DF9ECF1A970CAFBCD5315C9D8389770E627D3C913690256AA8BD753910DBB4FEA57E8AC5125E5B906CA0E0DF17081F34D",
+    "identity_type": "provisioned",
+    "iv": "39201C314CBC2D3F88EE094E627E7ADC",
+    "key_seed": "83FEF3C4A9E58DAA566F19AECC7C9CEE6EA4BA37F360EE8A40A26FBB99938F4B",
+    "metadata_key": "90A529D185FE0105D76179ED5AC841C8",
+    "section_mic_hmac_key": "8466111DFC334299442A84F91E3F6616C1023F2A29C72670C483F2445C18B75A",
+    "section_salt": "A6C0ECE0A9D25663F329C6C218D07CB5"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "6FB3720F743A68E6474B1459990DFAC6",
+    "aes_key": "A2E0437B429330BF82B8BA3B2B762770",
+    "data_elements": [
+      {
+        "contents": "13851601256B24E7",
+        "de_type": 404
+      },
+      {
+        "contents": "82FAAF4977AE0B80EAAC",
+        "de_type": 81
+      },
+      {
+        "contents": "C9B19F78DDF6FD66AA623267E9656C2E1EEB9F0F8253B1041626",
+        "de_type": 152
+      },
+      {
+        "contents": "EFD96E20D81B0ACD",
+        "de_type": 474
+      },
+      {
+        "contents": "2120F35E2B9EB9D5027BDC",
+        "de_type": 264
+      }
+    ],
+    "encoded_section": "8490137D769DEFAA2E8B1BCD01332139B1F4F99110008F7DCA2DC4146183C14177A6F847468B90043E07B7A107CC2C88A183F2D8D5A6C4A6119DFCB0603F251F3994F0468C56F2014A98BEF0881B342F28E7E83B89EBB28E2E54D88B0AAFEB4FDE73F8C8D918E818ED997A0CFB3ED6344189D0A06F4FDD3F780FC6E87421578FF68B06E6E0",
+    "identity_type": "provisioned",
+    "iv": "52A7C3FC58494668CB193C7C583AB583",
+    "key_seed": "D0B97B7B4CB8CF85A9E707ADD592E017BD7B3964F59801EA9A08DEB3E8A3EA47",
+    "metadata_key": "6AF91918569B21EC14C90B099284EEED",
+    "section_mic_hmac_key": "EA04A0F8FF46882A8B759E7E9D53CAAF2D847C393B5A47F6AA4284DA1BF8CF11",
+    "section_salt": "8F7DCA2DC4146183C14177A6F847468B"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "6F144BE070388B857B001873992CA0EF",
+    "aes_key": "0165985CBCA678350F250112E1354FCE",
+    "data_elements": [
+      {
+        "contents": "B6D2CE67C704514BB9F370812B470A56BA4BDD",
+        "de_type": 164
+      },
+      {
+        "contents": "49DCA454994B399B9914768E457F",
+        "de_type": 701
+      },
+      {
+        "contents": "FBD41AC2FCBB9B47F6B04863B8139AE83A9AF049A137F2A766",
+        "de_type": 466
+      },
+      {
+        "contents": "73A400CB6E36EB45BD1AE7",
+        "de_type": 172
+      },
+      {
+        "contents": "1113B990D3D4B31D4CEEFB849F8CAFD01A82968A61",
+        "de_type": 725
+      }
+    ],
+    "encoded_section": "A09013988012579D82091B81D39640A1F4B47891100077789262A428CFE712797C28D85A644A90021BBE826D956C08B86149427A8EFA6D801523C348FA78AF09433AF1A947269D58CDCA26055838209A01615CB0FFD9C55234D2EF9805FCB1FF8ED66137B2DE6A8C34F57F6FAC98645D1C482E851C77BFB1ACBB5A22E2CA297BAD14CAD0C08E4C8424C7A6E683C7EE8392A091DD9217DD6E5396D3644F01EF3CAE",
+    "identity_type": "trusted",
+    "iv": "7BAE887BD9B8BE99864343D585848A63",
+    "key_seed": "70CC58965C36307BE580E2793ACDC8D792FCFE8B17392B4F0B7A6ABC31D3CF02",
+    "metadata_key": "E503087FCE974FEDCC3290C2ABC2AF15",
+    "section_mic_hmac_key": "173560AC7513A51677C06801D39CE68B2E32F6BA7C02364800EF73AE27916ACC",
+    "section_salt": "77789262A428CFE712797C28D85A644A"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "BD864BCB86CC4FAFA1DF15D05C693F70",
+    "aes_key": "B7A853164A7D88165F7044725DE648FC",
+    "data_elements": [
+      {
+        "contents": "B6A9A4926FEDFDE5D8D870BA06144690",
+        "de_type": 175
+      },
+      {
+        "contents": "B8C403AC879A7EBB6D69458D",
+        "de_type": 720
+      }
+    ],
+    "encoded_section": "5990139BE32BB50428F39C6510AB0BCAE0A4519110002542EBE3983FF77643536AF98A47BDFE9001D2EFF80C4D9A6391063A16F2E989F5C02424E527596A15A5E2424EEA7317214FEEC57E1C28E1F47C8BE40C43839BD6CC2EE1",
+    "identity_type": "private",
+    "iv": "F1411FAE6BBB7AF0F798EF7898C1A026",
+    "key_seed": "15C3A38E12E82DE3D05867A72C09259B2F163E0F7E2B900013FD9589E4FCB08B",
+    "metadata_key": "BEF599A91BB40E6A3A12D69AA8AA40D5",
+    "section_mic_hmac_key": "B268F77855AAFA3A0AEC62CEF115FAF98C4616536512F7AD13EBAA17CC36237E",
+    "section_salt": "2542EBE3983FF77643536AF98A47BDFE"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "C4112B2B6BC0C275800AF30E221E029A",
+    "aes_key": "CB3E8DA92E33B125E206698CCDDB4E17",
+    "data_elements": [
+      {
+        "contents": "99A2BBD12EA3D487BA35A47215",
+        "de_type": 374
+      },
+      {
+        "contents": "3B4AD8B0AC9370A0DBECE41039A7C136D66AE40E251A274483E1E04B",
+        "de_type": 322
+      },
+      {
+        "contents": "3B5465ABD3AB9E51E37FE1825D19EBCB6D75",
+        "de_type": 882
+      },
+      {
+        "contents": "C3303DEB37C1CBF6F2D83CF60B5AAE7343",
+        "de_type": 508
+      },
+      {
+        "contents": "5AC15AF945563810514171B4D3CF13EB7CD056ED84CC4AD84E5C8C",
+        "de_type": 734
+      }
+    ],
+    "encoded_section": "AD9013C80618AEF0E93826CCBB9F1FC3CA1D2E911000BA4390D760820DE7D19BDD18E12105A99001E4F5385E499355B62DC8EB87A3B4B44BF0A799A099FF59F83CF7042DC080D469575ECB02FD8DC04FB60539411A4142E3386DDB945F456D90F6104B6D5893E7697CCB294A98597A07EDA2FA2A1B5C92DC85F720DCCC7B4F25639F1A8E912041148020E7EF5DBFDB6455C1DEF20F9B7A14218826843B218FA12FEC92D0AC0C0664304BF11B3962",
+    "identity_type": "private",
+    "iv": "E39A28DAC41BAE56D9C38A90DE18970E",
+    "key_seed": "F8956985D12A7454C239C35BD7F5B98FED6987FE6097F27888DC942E9B4F5BAE",
+    "metadata_key": "0DFAB0A1A5C1F1FB82F4E19C387EF630",
+    "section_mic_hmac_key": "D52D92CED4F96F98A96CDE0CBCBA70D22D695FE28A792490C9EC8AD3D7C512E4",
+    "section_salt": "BA4390D760820DE7D19BDD18E12105A9"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "C8281FAD7EBE43124AD3E52A64BDFC08",
+    "aes_key": "37FEED11494EC97655A7CDFAAFA0B332",
+    "data_elements": [
+      {
+        "contents": "2FEB5C0E9CB50EA61479D2",
+        "de_type": 182
+      },
+      {
+        "contents": "",
+        "de_type": 76
+      },
+      {
+        "contents": "EDFE252EC0AF1BCF3203E68626BD87DC210591FB4087E5",
+        "de_type": 186
+      },
+      {
+        "contents": "F3B28EE0AA3540",
+        "de_type": 53
+      }
+    ],
+    "encoded_section": "6A901326C139F9297299F3291C4C5449667C1E9110001C4A655CE96B261144D0DC30EEB06E819001ED20997FF72B0145678564A0823492B38F82A2908345E56312025794BFAB4154F007A7B8B672F38D5D78E5E201BB839A44D8E5819E8EE1563FF02619DBB4F3179D5719",
+    "identity_type": "private",
+    "iv": "6DD5002B0EC75F051EC1C94C9C5BD7DC",
+    "key_seed": "4E462ABDDDE34121284FE9958F24C16DBA38929E38A34F2019783CDAD5E08706",
+    "metadata_key": "AFEB6946137C5F406D7849DBC57AEA66",
+    "section_mic_hmac_key": "8C3FF0042FD0E1C4145EFCD9A7A84D636B6A58BE736B10AF391C72DB7B4CE6B7",
+    "section_salt": "1C4A655CE96B261144D0DC30EEB06E81"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "E64361FB1C8C7325B408FAEE1E49547A",
+    "aes_key": "7BBC46B2F18B3D283060D0A697FD11CD",
+    "data_elements": [
+      {
+        "contents": "9E4B0F0E1E5F8B4A48E6E85204B7B761BB77C2B8E9D87A",
+        "de_type": 398
+      },
+      {
+        "contents": "4DA86FD08563540F21F4D25BC7B6C8FFE5D0C256F695231A9758CB",
+        "de_type": 536
+      },
+      {
+        "contents": "0EF79DA8BA03209867C317EE62ED67FE793C10338A07C7509E5B394A",
+        "de_type": 892
+      },
+      {
+        "contents": "E5282DD8F645D9C437993F0B64E1C0126B51",
+        "de_type": 44
+      }
+    ],
+    "encoded_section": "A2901389A25CC355CD62CBE4A5003ACDF8EE059110002E283829FBEBE221CF9A1F91C1B0BD1D900171AB8293D624A4D2BE56FDE47583BBD8845F3855B25932CD6A1DCA7098797D301AFBFCF9A4A8A806E391C54F110D1B9D80A21CB9769249E819530E57270E20135F0406FC4C0BB0BBFB5EF126993AEE724E98B9E92A5B6992F8298B8C4FDC7D631588EAB84DD79BD92555DCD93E5FACC5EC36EB8B9F8DF0AB62F718",
+    "identity_type": "private",
+    "iv": "A926171CE5153CBD347A51C9978CE93F",
+    "key_seed": "F36B60BF6F555557AA212FC62B5C02A13C9C2BA4DF41EDD5A72F16AE66D236AD",
+    "metadata_key": "BB668D0081DBF606A285AD033DE92814",
+    "section_mic_hmac_key": "91908BF2F777B922CC1CC476A770C7FCAECCE0DE0B2A8F95FE44D507024B93A2",
+    "section_salt": "2E283829FBEBE221CF9A1F91C1B0BD1D"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "9DB5D8E94ABD7216DABD6C8F66C5F52F",
+    "aes_key": "75EB4826F32F9F8B7328CB265FDE141A",
+    "data_elements": [],
+    "encoded_section": "379013542EB74608EA671B4B9C539D5DAC9E0B911000371E5AA6A854D8B34632AF62FB16F9E39002958BD9049E4B9D49DB40BFB15A1DEB0C",
+    "identity_type": "trusted",
+    "iv": "FE2F66ADC508DBE090043C56A1D4CC2F",
+    "key_seed": "5694BC71EA736D6F1C9F9CB3F7359AF337754178D62E0CB2C8305813F7334036",
+    "metadata_key": "D7DF4817E2E00574C1CF3B5BA51411C3",
+    "section_mic_hmac_key": "B6CF96993547CD0B865BA29ACD9E7989CCA2A2CCFD940E81C97A613423F34D2B",
+    "section_salt": "371E5AA6A854D8B34632AF62FB16F9E3"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "815CAF890EB0DEA3D861BE22C7BE8485",
+    "aes_key": "34D85A4581FF6A69DBBD8CD74D881E2A",
+    "data_elements": [
+      {
+        "contents": "8E976835BD38B761F8F5C5E3",
+        "de_type": 175
+      }
+    ],
+    "encoded_section": "469013F70BA8EF34F0B010A6EDFF3E02486FFB91100057434E8D7DA6137D885EE4B43DA850B09001367A8D04108F605A363DDE7A55DBC6D28C92FE23A27E7D70FF072A469793CD",
+    "identity_type": "private",
+    "iv": "0F43CBDBB69194C72762C45B8A959AE2",
+    "key_seed": "9DCDB616C7824FE6E29EDEE371A1F019AB9035DEA6A2FAEED01086EB7C7BA56E",
+    "metadata_key": "386504600FDC6BB6D29B931F997569C3",
+    "section_mic_hmac_key": "40CCE5D2E8BD439CE407FADC7D03C1E5E3EE7BDB2AE09C3DAEEDBCD383994AAC",
+    "section_salt": "57434E8D7DA6137D885EE4B43DA850B0"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "20AA489B07F54A47398F0D452085BA80",
+    "aes_key": "70E8FE98FC7B2F2BAF0F571C5A6CA285",
+    "data_elements": [
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+    "data_elements": [
+      {
+        "contents": "FE93A34B0B728ECB4A1A23B7",
+        "de_type": 938
+      }
+    ],
+    "encoded_section": "469013713B65A9B2834CC302E660F1516FDC529110004BAED26B52E7D85BAD585AACA26600A990012172B89B62912AE533F371A8CE4F587B90B48A534F119A5F6CB20BDD6FCD32",
+    "identity_type": "private",
+    "iv": "A6AD44BD75DDB36D3E11CA72047ED68C",
+    "key_seed": "47690302DC37FEBF9C4D5CC6453DCEFC40DBB204E5A7A81D0B30E74247BCDA80",
+    "metadata_key": "C114855EDA0E56FA324577137E531FEC",
+    "section_mic_hmac_key": "B4904367A2141DBFE77167BAC1FE7D508DC07B7496B26448682FD7FF3215B8AB",
+    "section_salt": "4BAED26B52E7D85BAD585AACA26600A9"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "397B5F51522DFEA7E1B243BC5D947FDA",
+    "aes_key": "7BF127F44E510A7B407A4C35B82172B8",
+    "data_elements": [
+      {
+        "contents": "9E3AD15489CC97EFA791DBD20D6D59F1D9A1D055F080076C9E0849",
+        "de_type": 313
+      },
+      {
+        "contents": "0F8046",
+        "de_type": 262
+      },
+      {
+        "contents": "3A76F640ADDA98B2009266BAEC469C8F33D2991D9AE4F48D13E5",
+        "de_type": 693
+      },
+      {
+        "contents": "B98E5D7725F819C7860151C7C6E0B6",
+        "de_type": 970
+      },
+      {
+        "contents": "8E497812B532C1731A1E42BB0D",
+        "de_type": 131
+      }
+    ],
+    "encoded_section": "9A9013623FFEC846FA4EC80AEEE5874F724150911000E4DCFCC4EE61C6352DF5285906A7ACA19002CE3757CF407DBA7A4AC984C7CE89DC1E5E88F6B6DE50085A04894DD3DDB94DBACD840C7744A81D9273C6D6B389314C7DE82B39FA0EEA7F9EF932B412F2B43EF444E59722BA59A51E54162417D4D510FFF996861298FC0346008F9A960744495B72F646ACA5B3607F8EA4C345AFD418DFE65A5F",
+    "identity_type": "trusted",
+    "iv": "DC4BBB79EC29CCC02C79BEBD45C7BB70",
+    "key_seed": "874471CC674DCC5A5BD7E8207CB62F4862C69B6FB28F86BE947A8249F8AD45CA",
+    "metadata_key": "B8420F0DC2CAD8BE94C2878461F62CA7",
+    "section_mic_hmac_key": "A60A350281B1B0C59E0F9E44DE3F139D4D5278D21E9325B60A0C1099981C4D47",
+    "section_salt": "E4DCFCC4EE61C6352DF5285906A7ACA1"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "14A4E23F310594A923AC2B00CD26FDDF",
+    "aes_key": "033A7FAED90FD1A0FF7080EDC2D150AD",
+    "data_elements": [],
+    "encoded_section": "379013EE55550B8DB3B2D0626ABA7D899DCB1B911000F83C0914EC025DD986BF39B9AA4633D090018687E96989F94FF3D2365FB2CDB89BEF",
+    "identity_type": "private",
+    "iv": "E4838E64DC9F04328312FC0952FE1955",
+    "key_seed": "32AC43A2C4F720EA7255D9B5025B7219801F4A728DAD5DE4C841480BFC6CAF0B",
+    "metadata_key": "DCD150DA1D4622EA1FB364C64CC56352",
+    "section_mic_hmac_key": "5713D6A91073B3FC250693CF7608174F7B5C8BB0B89717849AF78745F4BB74FA",
+    "section_salt": "F83C0914EC025DD986BF39B9AA4633D0"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "9A5A6E11C1791C48E6BC440FD2B275BC",
+    "aes_key": "54D9612F2A7BE396A390954DFD2F2DB0",
+    "data_elements": [],
+    "encoded_section": "37901371B7C653BFB0E41F1BDA3228F707E39E91100058E26761B259F743F644564A6B23A0CC900155CA0E1E76DF190C54E9142FDBE55CFE",
+    "identity_type": "private",
+    "iv": "6B14BB04BBC14392A524A69EB6316F51",
+    "key_seed": "965BB1781732640C7237DDD1679D07C089927C6A869442EBB23960B536262A9F",
+    "metadata_key": "7FA623CCF685E489F680D2898580DD72",
+    "section_mic_hmac_key": "D3FC8D9843906152A789A16A150C0BAACA74BB5AF33A886552CBFA7C6D529029",
+    "section_salt": "58E26761B259F743F644564A6B23A0CC"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "64006DB572776637FD097DE973732A7B",
+    "aes_key": "669E44E9F98F153D8179E44A19F25623",
+    "data_elements": [
+      {
+        "contents": "7B",
+        "de_type": 638
+      },
+      {
+        "contents": "F00D4AB2C34F139458F1AF9265FA9EA175ED4EE85167",
+        "de_type": 958
+      },
+      {
+        "contents": "87417FB6114F",
+        "de_type": 499
+      },
+      {
+        "contents": "683ED3E93B91EB3FAED44E29457BE80D878415985D41B5F460",
+        "de_type": 129
+      }
+    ],
+    "encoded_section": "7990133E374729219551A1BB61EFF4D5AD6B6791100034159DC9EEC690F4ECD6A20A569E8CD29002A28031BC640DEB07E8AC9C7F941289B1327A5247718B0AD60B2A8769AF9749567EAF8A236425CDDF878FE17A735BF4AAB4ECCC4FC34AF217238857F87A06AE9EFAEC7C85452D2439BC5E9E08CF568AB5C7FD",
+    "identity_type": "trusted",
+    "iv": "26F5D4D8B5EB6069AEF2B6E435D30DB8",
+    "key_seed": "15A1B8E687F0DF912101CE373495959EE40D2D1FECB951B41C87DB9A0B4C3EF2",
+    "metadata_key": "4ED47FC3167C69F90160E2A9BDDC6A8B",
+    "section_mic_hmac_key": "7DE079745790A823A62470384F692A5CE4AD1C757AFE96917811EF13AD2CC8BC",
+    "section_salt": "34159DC9EEC690F4ECD6A20A569E8CD2"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "5DDB5AA2FA3F0A61D18C52E9DE22CDE6",
+    "aes_key": "E60C3ACE2E521468137DAE60C115B3F5",
+    "data_elements": [
+      {
+        "contents": "8DD936",
+        "de_type": 244
+      }
+    ],
+    "encoded_section": "3D90138C161B53E44488EDAE5C545A49CB632F9110007272DFA635A1B1F42A62BE9147CCC4429004CE40129E8D256DA63B8B6AFA1FD16791EB33FD546813",
+    "identity_type": "provisioned",
+    "iv": "C03127C86766B5299AA2A30C42931072",
+    "key_seed": "A0F876D63DFEBBBC68F52B9A52582992D53E8DBC84DCA86598DDD6B41F1994D8",
+    "metadata_key": "189A12F2813D0C3D6E6A852F1298AE8A",
+    "section_mic_hmac_key": "853A31A3BBD636810AE5DEA65BC5739408F9D7DC1661B56D0E54A60A9C59DFE8",
+    "section_salt": "7272DFA635A1B1F42A62BE9147CCC442"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "9D031FAD682DAA4BBCA6912CCBB83C09",
+    "aes_key": "E1B5FA0F1A67F72E01B807F6495C6393",
+    "data_elements": [
+      {
+        "contents": "BA0688D5",
+        "de_type": 327
+      },
+      {
+        "contents": "CB0502569855FDA6DDA289FB7CA7F8447CB118E542",
+        "de_type": 880
+      },
+      {
+        "contents": "99FF",
+        "de_type": 940
+      },
+      {
+        "contents": "",
+        "de_type": 195
+      }
+    ],
+    "encoded_section": "5E9013101E7BB804EC51155AFE647EF89D6FAB91100042441ECF37BAF5319477A42541165CE49001AB8ACECCD8F482909FBC48F308CE76945B74681CE578A664996962BF4F4960586B4D100A83BCEFC21C073BE5407B32F6FE37E4181A8416",
+    "identity_type": "private",
+    "iv": "006B7FFEC2A4BC7AF80376E12B9CF206",
+    "key_seed": "3FDC2376B9AA5ABAA54091F4C3D17E62453E5C4BCA3F7E97D02C087E3D3E56EC",
+    "metadata_key": "2A9A5CD0C8BBE65B4DA2AC93A3646ADB",
+    "section_mic_hmac_key": "409C1FA5A935DF46FD0B0BA1F4B6676DC8E53F92992C41B1E167DCAAF92C6B75",
+    "section_salt": "42441ECF37BAF5319477A42541165CE4"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "402E548FE3E9094AE8327C5D67323EF3",
+    "aes_key": "74A450709337C059E4B06AA7339A847A",
+    "data_elements": [
+      {
+        "contents": "DDEE0C575B876057217E9EBD9A54DC6DDEC5E09A7C8B5AF9B2699B2F4D",
+        "de_type": 370
+      },
+      {
+        "contents": "CD8ECC401DC9D100AB80772990FD586CD51C0F63BCC51C1BC1",
+        "de_type": 762
+      },
+      {
+        "contents": "D4219120DC8A3A5A31C38174E515",
+        "de_type": 447
+      },
+      {
+        "contents": "A7B56D78AA8970937A2B0E39A94148EFE9BE381F0B",
+        "de_type": 890
+      },
+      {
+        "contents": "4C4E4BB8BC53C76E9BDEDAAF9D853E00A0556A6A",
+        "de_type": 561
+      }
+    ],
+    "encoded_section": "B39013556E8D35D3BFBCC66BA7FE806642527C9110005AFB2CBC5F6FF709C77C5E5B44FEC2639001302F90C4EE1CC3A669EBC8C94F549755BCBC764D07AC7B44259C7E72BAD6B0603D2618A56A1D5D9D0F8F3361A4F4BA89B14F98D3E27F95F1CA5DB58B7C9710E5785C12C126D0199B28A6955E728FE9E0D56AEA4522B7289D149FFA9AC110B751ACC06CD17F40F3E0EE67191DAF9E12EF7897E526F0037E46E22CD772FFB6A8FA8A6075E7BD51BE635A620EE8",
+    "identity_type": "private",
+    "iv": "91B130A57119A917BE672E882CD24F0A",
+    "key_seed": "349BAC58EA19F4DFC1E615A8F712C39D4A8F9D9371C92914FF7FEB3273EAFA96",
+    "metadata_key": "ECB79F56C63D39774DA1093D67A2E2BE",
+    "section_mic_hmac_key": "EC055CD96AA83E58972330916292606A56E320F4078D3E37125FD521366D2C13",
+    "section_salt": "5AFB2CBC5F6FF709C77C5E5B44FEC263"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "5FC40591E60B01771FD86CA3E3EFBAA9",
+    "aes_key": "527134D81C8BB7C6BECF31F34C4FB7EF",
+    "data_elements": [
+      {
+        "contents": "342CFE0C131BCA582A2B7F241FDDC5ECF120E98493391304BAFA",
+        "de_type": 217
+      }
+    ],
+    "encoded_section": "5490131A3E437EC13FDD67C82E5A3E273E9CD391100014444BDF8E6863B041C4F0C1CDEC855D900484ADD7102010AF6513B7367DD4D398FC2D1670B31EB05EB75F6451ABC3AF64D23D067AD0B26AEDEC08DD6BF5F5",
+    "identity_type": "provisioned",
+    "iv": "B58720B7A9092A88B216BDC537A2C0C6",
+    "key_seed": "7795E9287DF02DB694AA5A17909EF3ABAF2B3A67D317F0BA403077B148680D3A",
+    "metadata_key": "719D474AF4AC20EA51773F7D689FCBC8",
+    "section_mic_hmac_key": "CA2941EF019C602CD34C2D7A728687EBB9D640E5DFA764616AB435EF32B4955E",
+    "section_salt": "14444BDF8E6863B041C4F0C1CDEC855D"
+  },
+  {
+    "adv_header_byte": "30",
+    "adv_salt": "64E4BB1721EA0A79B18FA4CF2DFCF10C",
+    "aes_key": "4FC66B746D81042C4012C9CA05EB0F52",
+    "data_elements": [
+      {
+        "contents": "F3F4EFB14E81119C7C2E98F2",
+        "de_type": 608
+      },
+      {
+        "contents": "C41DD9601061BB775DBC3608789A30523E95B3B05B",
+        "de_type": 966
+      },
+      {
+        "contents": "B33460D6D8E3DF0ADF19BDD666E4",
+        "de_type": 973
+      },
+      {
+        "contents": "CDE289B7ECC9B6CDE5EA6BB595AC3019FE7F",
+        "de_type": 480
+      }
+    ],
+    "encoded_section": "849013AACDF54AA823590AF5804916E75A4517911000EF56099BC3FE4347649E0E59527C7A6190015C377B56675F536A451BF7CCFB4F79940DFE2ACB47AFB42B017C572E08DF98CFA55C5EC810CBEC57BC340A59E1F3414E7FCA6E17CD675EC950EFCCA7F589D4187557EA6AEA5F0E752B32C9540691FA07A9904598AE2FF4703638729108",
+    "identity_type": "private",
+    "iv": "9862F303568F4CEEEE16790805706ADC",
+    "key_seed": "790EEE3F64023DF0E967BECC5F9C1881A0E23AABE20BF85D35F0CA9E212D4C9B",
+    "metadata_key": "5C624608CAB1BE8DE5DF6A058AC025AE",
+    "section_mic_hmac_key": "F6216E6FCE355E0BD447D8B39A621A566767EEC8EE2F3AF3E86777DCC894B63B",
+    "section_salt": "EF56099BC3FE4347649E0E59527C7A61"
+  }
+]
+
diff --git a/nearby/presence/np_adv/tests/examples_v0.rs b/nearby/presence/np_adv/tests/examples_v0.rs
new file mode 100644
index 0000000..e30e12f
--- /dev/null
+++ b/nearby/presence/np_adv/tests/examples_v0.rs
@@ -0,0 +1,101 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use crypto_provider_default::CryptoProviderImpl;
+use ldt_np_adv::*;
+use np_adv::legacy::data_elements::TxPowerDataElement;
+use np_adv::{
+    credential::{
+        simple::SimpleV0Credential, source::SliceCredentialSource,
+        v0::MinimumFootprintV0CryptoMaterial,
+    },
+    de_type::*,
+    deserialize_v0_advertisement,
+    legacy::deserialize::*,
+    shared_data::*,
+    *,
+};
+
+#[test]
+fn v0_deser_plaintext() {
+    let creds =
+        SliceCredentialSource::<SimpleV0Credential<MinimumFootprintV0CryptoMaterial, ()>>::new(&[]);
+    let adv = deserialize_v0_advertisement::<_, _, CryptoProviderImpl>(
+        &[
+            0x00, // adv header
+            0x03, // public identity
+            0x15, 0x03, // Length 1 Tx Power DE with value 3
+        ],
+        &creds,
+    )
+    .unwrap();
+
+    match adv {
+        V0AdvContents::Plaintext(p) => {
+            assert_eq!(PlaintextIdentityMode::Public, p.identity());
+            assert_eq!(
+                vec![&PlainDataElement::TxPower(TxPowerDataElement::from(
+                    TxPower::try_from(3).unwrap()
+                )),],
+                p.data_elements().collect::<Vec<_>>()
+            );
+        }
+        _ => panic!("this example is plaintext"),
+    }
+}
+
+#[test]
+fn v0_deser_ciphertext() {
+    let key_seed = [0x11_u8; 32];
+    let metadata_key: [u8; NP_LEGACY_METADATA_KEY_LEN] = [0x33; NP_LEGACY_METADATA_KEY_LEN];
+
+    let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+    let metadata_key_hmac: [u8; 32] =
+        hkdf.legacy_metadata_key_hmac_key().calculate_hmac(&metadata_key);
+
+    // output of building a packet using AdvBuilder
+    let adv = &[
+        0x00, // adv header
+        0x21, // private DE w/ a 2 byte payload
+        0x22, 0x22, // salt
+        // ciphertext for metadata key & txpower DE
+        0x85, 0xBF, 0xA8, 0x83, 0x58, 0x7C, 0x50, 0xCF, 0x98, 0x38, 0xA7, 0x8A, 0xC0, 0x1C, 0x96,
+        0xF9,
+    ];
+
+    let credentials: [SimpleV0Credential<_, [u8; 32]>; 1] = [SimpleV0Credential::new(
+        MinimumFootprintV0CryptoMaterial::new(key_seed, metadata_key_hmac),
+        key_seed,
+    )];
+    let cred_source = SliceCredentialSource::new(credentials.as_slice());
+
+    let matched = match deserialize_v0_advertisement::<_, _, CryptoProviderImpl>(adv, &cred_source)
+        .unwrap()
+    {
+        V0AdvContents::Decrypted(c) => c,
+        _ => panic!("this examples is ciphertext"),
+    };
+
+    assert_eq!(&key_seed, matched.matched_credential().matched_data());
+    let decrypted = matched.contents();
+
+    assert_eq!(EncryptedIdentityDataElementType::Private, decrypted.identity_type());
+
+    assert_eq!(&metadata_key, decrypted.metadata_key());
+
+    assert_eq!(
+        vec![&PlainDataElement::TxPower(TxPowerDataElement::from(TxPower::try_from(3).unwrap())),],
+        decrypted.data_elements().collect::<Vec<_>>()
+    );
+}
diff --git a/nearby/presence/np_adv/tests/examples_v1.rs b/nearby/presence/np_adv/tests/examples_v1.rs
new file mode 100644
index 0000000..fbda763
--- /dev/null
+++ b/nearby/presence/np_adv/tests/examples_v1.rs
@@ -0,0 +1,181 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use crypto_provider::{CryptoProvider, CryptoRng};
+use crypto_provider_default::CryptoProviderImpl;
+use np_adv::extended::data_elements::TxPowerDataElement;
+use np_adv::extended::serialize::SingleTypeDataElement;
+use np_adv::shared_data::TxPower;
+use np_adv::{
+    credential::{
+        simple::SimpleV1Credential, source::SliceCredentialSource,
+        v1::MinimumFootprintV1CryptoMaterial,
+    },
+    de_type::*,
+    deserialize_v1_advertisement,
+    extended::{
+        deserialize::{Section, VerificationMode},
+        serialize::{AdvBuilder, SignedEncrypted},
+        NP_V1_ADV_MAX_SECTION_COUNT,
+    },
+    PlaintextIdentityMode, *,
+};
+use np_hkdf::v1_salt;
+
+#[test]
+fn v1_deser_plaintext() {
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+    section_builder
+        .add_de(|_salt| TxPowerDataElement::from(TxPower::try_from(6).unwrap()))
+        .unwrap();
+    section_builder.add_to_advertisement();
+    let adv = adv_builder.into_advertisement();
+
+    let creds =
+        SliceCredentialSource::<SimpleV1Credential<MinimumFootprintV1CryptoMaterial, ()>>::new(&[]);
+    let contents =
+        deserialize_v1_advertisement::<_, _, CryptoProviderImpl>(adv.as_slice(), &creds).unwrap();
+
+    assert_eq!(0, contents.invalid_sections_count());
+
+    let sections = contents.sections().collect::<Vec<_>>();
+
+    assert_eq!(1, sections.len());
+
+    let section = match &sections[0] {
+        V1DeserializedSection::Plaintext(s) => s,
+        _ => panic!("this is a plaintext adv"),
+    };
+    assert_eq!(PlaintextIdentityMode::Public, section.identity());
+    let data_elements = section.data_elements().collect::<Vec<_>>();
+    assert_eq!(1, data_elements.len());
+
+    let de = &data_elements[0];
+    assert_eq!(v1_salt::DataElementOffset::from(1), de.offset());
+    assert_eq!(TxPowerDataElement::DE_TYPE, de.de_type());
+    assert_eq!(&[6], de.contents());
+}
+
+#[test]
+fn v1_deser_ciphertext() {
+    // identity material
+    let mut rng = <CryptoProviderImpl as CryptoProvider>::CryptoRng::new();
+    let metadata_key: [u8; 16] = rng.gen();
+    let key_pair = np_ed25519::KeyPair::<CryptoProviderImpl>::generate();
+    let key_seed = rng.gen();
+    let hkdf = np_hkdf::NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed);
+
+    // prepare advertisement
+    let mut adv_builder = AdvBuilder::new();
+    let mut section_builder = adv_builder
+        .section_builder(SignedEncrypted::new_random_salt(
+            &mut rng,
+            EncryptedIdentityDataElementType::Private,
+            &metadata_key,
+            &key_pair,
+            &hkdf,
+        ))
+        .unwrap();
+    section_builder
+        .add_de(|_salt| TxPowerDataElement::from(TxPower::try_from(7).unwrap()))
+        .unwrap();
+    section_builder.add_to_advertisement();
+    let adv = adv_builder.into_advertisement();
+
+    let cred_array: [SimpleV1Credential<_, [u8; 32]>; 1] = [SimpleV1Credential::new(
+        MinimumFootprintV1CryptoMaterial::new(
+            key_seed,
+            [0; 32], // Zeroing out MIC HMAC, since it's unused in examples here.
+            hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key),
+            key_pair.public(),
+        ),
+        key_seed,
+    )];
+    let creds = SliceCredentialSource::new(&cred_array);
+    let contents =
+        deserialize_v1_advertisement::<_, _, CryptoProviderImpl>(adv.as_slice(), &creds).unwrap();
+
+    assert_eq!(0, contents.invalid_sections_count());
+
+    let sections = contents.sections().collect::<Vec<_>>();
+    assert_eq!(1, sections.len());
+
+    let matched_credential = match &sections[0] {
+        V1DeserializedSection::Decrypted(d) => d,
+        _ => panic!("this is a ciphertext adv"),
+    };
+
+    assert_eq!(&key_seed, matched_credential.matched_credential().matched_data());
+    let section = matched_credential.contents();
+
+    assert_eq!(EncryptedIdentityDataElementType::Private, section.identity_type());
+    assert_eq!(VerificationMode::Signature, section.verification_mode());
+    assert_eq!(&metadata_key, section.metadata_key());
+
+    let data_elements = section.data_elements().collect::<Vec<_>>();
+    assert_eq!(1, data_elements.len());
+
+    let de = &data_elements[0];
+    assert_eq!(v1_salt::DataElementOffset::from(2), de.offset());
+    assert_eq!(TxPowerDataElement::DE_TYPE, de.de_type());
+    assert_eq!(&[7], de.contents());
+}
+
+#[test]
+fn v1_deser_no_section() {
+    let adv_builder = AdvBuilder::new();
+    let adv = adv_builder.into_advertisement();
+    let creds =
+        SliceCredentialSource::<SimpleV1Credential<MinimumFootprintV1CryptoMaterial, ()>>::new(&[]);
+    let v1_deserialize_error =
+        deserialize_v1_advertisement::<_, _, CryptoProviderImpl>(adv.as_slice(), &creds)
+            .expect_err(" Expected an error");
+    assert_eq!(
+        v1_deserialize_error,
+        AdvDeserializationError::ParseError {
+            details_hazmat: AdvDeserializationErrorDetailsHazmat::AdvertisementDeserializeError
+        }
+    );
+}
+
+#[test]
+fn v1_deser_plaintext_over_max_sections() {
+    let mut adv_builder = AdvBuilder::new();
+    for _ in 0..NP_V1_ADV_MAX_SECTION_COUNT {
+        let mut section_builder = adv_builder.section_builder(PublicIdentity::default()).unwrap();
+        section_builder
+            .add_de(|_salt| TxPowerDataElement::from(TxPower::try_from(7).unwrap()))
+            .unwrap();
+        section_builder.add_to_advertisement();
+    }
+    let mut adv = adv_builder.into_advertisement().as_slice().to_vec();
+    // Push an extra section
+    adv.extend_from_slice(
+        [
+            0x01, // Section header
+            0x03, // Public identity
+        ]
+        .as_slice(),
+    );
+    let creds =
+        SliceCredentialSource::<SimpleV1Credential<MinimumFootprintV1CryptoMaterial, ()>>::new(&[]);
+    assert_eq!(
+        deserialize_v1_advertisement::<_, _, CryptoProviderImpl>(adv.as_slice(), &creds)
+            .unwrap_err(),
+        AdvDeserializationError::ParseError {
+            details_hazmat: AdvDeserializationErrorDetailsHazmat::AdvertisementDeserializeError
+        }
+    );
+}
diff --git a/nearby/presence/np_c_ffi/Cargo.lock b/nearby/presence/np_c_ffi/Cargo.lock
new file mode 100644
index 0000000..ca23800
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+name = "windows_i686_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
+[[package]]
+name = "x25519-dalek"
+version = "2.0.0-rc.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec7fae07da688e17059d5886712c933bb0520f15eff2e09cfa18e30968f4e63a"
+dependencies = [
+ "curve25519-dalek",
+ "rand_core",
+]
+
+[[package]]
+name = "xts_aes"
+version = "0.1.0"
+dependencies = [
+ "array_ref",
+ "crypto_provider",
+ "ldt_tbc",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
diff --git a/nearby/presence/np_c_ffi/Cargo.toml b/nearby/presence/np_c_ffi/Cargo.toml
new file mode 100644
index 0000000..1dd9f32
--- /dev/null
+++ b/nearby/presence/np_c_ffi/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "np_c_ffi"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+# TODO: We need to make this configurable for this crate and for np_ffi below it.
+crypto_provider_default = {path = "../../crypto/crypto_provider_default", features = ["rustcrypto"]}
+np_ffi_core = {path = "../np_ffi_core"}
+spin = "0.9.8"
+
+[build-dependencies]
+cbindgen = "0.24.5"
+
+[lib]
+# boringssl and bssl-sys are built as a static lib, so we need to as well
+crate-type = ["staticlib"]
\ No newline at end of file
diff --git a/nearby/presence/np_c_ffi/build.rs b/nearby/presence/np_c_ffi/build.rs
new file mode 100644
index 0000000..b282709
--- /dev/null
+++ b/nearby/presence/np_c_ffi/build.rs
@@ -0,0 +1,63 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use cbindgen::ItemType::*;
+use std::vec;
+
+const C_CONFIG: &str = "cbindgen_configs/c_config.toml";
+const C_OUTPUT_HEADER_FILE: &str = "include/c/np_c_ffi.h";
+
+const CPP_CONFIG: &str = "cbindgen_configs/cpp_config.toml";
+const CPP_INCLUDE_DIR_BASE: &str = "include/cpp/";
+const CPP_PUBLIC_HEADER_FILE: &str = "np_cpp_ffi_types.h";
+const CPP_INTERNAL_HEADER_FILE: &str = "np_cpp_ffi_functions.h";
+
+fn main() {
+    let crate_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    let config_file = format!("{crate_dir}/{C_CONFIG}");
+    let config = cbindgen::Config::from_file(config_file).expect("Config file should exist");
+    generate_c_header(&crate_dir, config);
+
+    let config_file = format!("{crate_dir}/{CPP_CONFIG}");
+    let config = cbindgen::Config::from_file(config_file).expect("Config file should exist");
+    generate_private_cpp_header(&crate_dir, config.clone());
+    generate_public_cpp_header(&crate_dir, config);
+}
+
+fn generate_c_header(crate_dir: &String, config: cbindgen::Config) {
+    let output_header_file = format!("{crate_dir}/{C_OUTPUT_HEADER_FILE}");
+    generate_header(&output_header_file, crate_dir, config);
+}
+
+fn generate_private_cpp_header(crate_dir: &String, mut config: cbindgen::Config) {
+    config.export.item_types.append(&mut vec![Functions]);
+    config.includes.push(CPP_PUBLIC_HEADER_FILE.to_string());
+    let output_header_file =
+        format!("{crate_dir}/{CPP_INCLUDE_DIR_BASE}/{CPP_INTERNAL_HEADER_FILE}");
+    generate_header(&output_header_file, crate_dir, config);
+}
+
+fn generate_public_cpp_header(crate_dir: &String, mut config: cbindgen::Config) {
+    config.export.item_types.append(&mut vec![Enums, Structs]);
+    let output_header_file = format!("{crate_dir}/{CPP_INCLUDE_DIR_BASE}/{CPP_PUBLIC_HEADER_FILE}");
+    generate_header(&output_header_file, crate_dir, config);
+}
+
+fn generate_header(output_file: &String, crate_dir: &String, config: cbindgen::Config) {
+    let _ = cbindgen::generate_with_config(crate_dir, config)
+        .map_err(|e| println!("cargo:warning=ERROR: {e}"))
+        .expect("c header file generation failed")
+        .write_to_file(output_file);
+}
diff --git a/nearby/presence/np_c_ffi/cbindgen_configs/c_config.toml b/nearby/presence/np_c_ffi/cbindgen_configs/c_config.toml
new file mode 100644
index 0000000..88483b0
--- /dev/null
+++ b/nearby/presence/np_c_ffi/cbindgen_configs/c_config.toml
@@ -0,0 +1,50 @@
+language = "C"
+
+# Instead go through CPP generated header
+cpp_compat = false
+
+style = "type"
+header = """
+/*
+ Copyright 2023 Google LLC
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+"""
+pragma_once = true
+autogen_warning = """
+/*
+ WARNING: this file is autogenerated by cbindgen. Don't modify this manually.
+ Additionally, you should _not_ rely upon the layouts of the generated
+ structs and unions if you want your code to be forward-compatible,
+ unless a given type explicitly states in its documentation that it has
+ a guaranteed forward-compatible layout.
+ Instead, you should use _only_ the provided exported function symbols.
+*/"""
+include_version = true
+
+sort_by = "None" # Use order specified in Rust
+
+[export]
+# Prefix to add before the name of every item
+prefix = "np_ffi_"
+
+[enum]
+rename_variants = "QualifiedScreamingSnakeCase"
+
+[parse]
+parse_deps = true
+include = ["np_c_ffi", "np_ffi_core"]
+
+[parse.expand]
+crates = ["np_ffi_core"]
+default_features = true
diff --git a/nearby/presence/np_c_ffi/cbindgen_configs/cpp_config.toml b/nearby/presence/np_c_ffi/cbindgen_configs/cpp_config.toml
new file mode 100644
index 0000000..5a2ba2a
--- /dev/null
+++ b/nearby/presence/np_c_ffi/cbindgen_configs/cpp_config.toml
@@ -0,0 +1,44 @@
+language = "C++"
+
+style = "type"
+header = """
+/*
+ Copyright 2023 Google LLC
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+"""
+pragma_once = true
+autogen_warning = """
+/*
+ WARNING: this file is autogenerated by cbindgen. Don't modify this manually.
+ Additionally, you should _not_ rely upon the layouts of the generated
+ structs and unions if you want your code to be forward-compatible,
+ unless a given type explicitly states in its documentation that it has
+ a guaranteed forward-compatible layout.
+ Instead, you should use _only_ the provided exported function symbols.
+*/"""
+include_version = true
+namespaces = ["np_ffi", "internal"]
+
+sort_by = "None" # Use order specified in Rust
+
+[enum]
+rename_variants = "None"
+
+[parse]
+parse_deps = true
+include = ["np_c_ffi", "np_ffi_core"]
+
+[parse.expand]
+crates = ["np_ffi_core"]
+default_features = true
diff --git a/nearby/presence/np_c_ffi/include/c/np_c_ffi.h b/nearby/presence/np_c_ffi/include/c/np_c_ffi.h
new file mode 100644
index 0000000..03e5821
--- /dev/null
+++ b/nearby/presence/np_c_ffi/include/c/np_c_ffi.h
@@ -0,0 +1,890 @@
+/*
+ Copyright 2023 Google LLC
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+
+#pragma once
+
+/* Generated with cbindgen:0.24.5 */
+
+/*
+ WARNING: this file is autogenerated by cbindgen. Don't modify this manually.
+ Additionally, you should _not_ rely upon the layouts of the generated
+ structs and unions if you want your code to be forward-compatible,
+ unless a given type explicitly states in its documentation that it has
+ a guaranteed forward-compatible layout.
+ Instead, you should use _only_ the provided exported function symbols.
+*/
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+/**
+ * The possible boolean action types which can be present in an Actions data element
+ */
+enum np_ffi_BooleanActionType {
+  NP_FFI_BOOLEAN_ACTION_TYPE_ACTIVE_UNLOCK = 8,
+  NP_FFI_BOOLEAN_ACTION_TYPE_NEARBY_SHARE = 9,
+  NP_FFI_BOOLEAN_ACTION_TYPE_INSTANT_TETHERING = 10,
+  NP_FFI_BOOLEAN_ACTION_TYPE_PHONE_HUB = 11,
+  NP_FFI_BOOLEAN_ACTION_TYPE_PRESENCE_MANAGER = 12,
+  NP_FFI_BOOLEAN_ACTION_TYPE_FINDER = 13,
+  NP_FFI_BOOLEAN_ACTION_TYPE_FAST_PAIR_SASS = 14,
+};
+typedef uint8_t np_ffi_BooleanActionType;
+
+/**
+ * Discriminant for `CreateCredentialBookResult`
+ */
+enum np_ffi_CreateCredentialBookResultKind {
+  /**
+   * There was no space left to create a new credential book
+   */
+  NP_FFI_CREATE_CREDENTIAL_BOOK_RESULT_KIND_NO_SPACE_LEFT = 0,
+  /**
+   * We created a new credential book behind the given handle.
+   * The associated payload may be obtained via
+   * `CreateCredentialBookResult#into_success()`.
+   */
+  NP_FFI_CREATE_CREDENTIAL_BOOK_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_CreateCredentialBookResultKind;
+
+/**
+ * A result-type enum which tells the caller whether/not a deallocation
+ * succeeded or failed due to the requested handle not being present.
+ */
+typedef enum {
+  /**
+   * The requested handle to deallocate was not present in the map
+   */
+  NP_FFI_DEALLOCATE_RESULT_NOT_PRESENT = 0,
+  /**
+   * The object behind the handle was successfully deallocated
+   */
+  NP_FFI_DEALLOCATE_RESULT_SUCCESS = 1,
+} np_ffi_DeallocateResult;
+
+/**
+ * Discriminant for `DeserializeAdvertisementResult`.
+ */
+enum np_ffi_DeserializeAdvertisementResultKind {
+  /**
+   * Deserializing the advertisement failed, for some reason or another.
+   */
+  NP_FFI_DESERIALIZE_ADVERTISEMENT_RESULT_KIND_ERROR = 0,
+  /**
+   * The advertisement was correctly deserialized, and it's a V0 advertisement.
+   * `DeserializeAdvertisementResult#into_v0()` is the corresponding cast
+   * to the associated enum variant.
+   */
+  NP_FFI_DESERIALIZE_ADVERTISEMENT_RESULT_KIND_V0 = 1,
+  /**
+   * The advertisement was correctly deserialized, and it's a V1 advertisement.
+   * `DeserializeAdvertisementResult#into_v1()` is the corresponding cast
+   * to the associated enum variant.
+   */
+  NP_FFI_DESERIALIZE_ADVERTISEMENT_RESULT_KIND_V1 = 2,
+};
+typedef uint8_t np_ffi_DeserializeAdvertisementResultKind;
+
+/**
+ * Discriminant for possible results of V0 advertisement deserialization
+ */
+enum np_ffi_DeserializedV0AdvertisementKind {
+  /**
+   * The deserialized V0 advertisement was legible.
+   * The associated payload may be obtained via
+   * `DeserializedV0Advertisement#into_legible`.
+   */
+  NP_FFI_DESERIALIZED_V0_ADVERTISEMENT_KIND_LEGIBLE = 0,
+  /**
+   * The deserialized V0 advertisement is illegible,
+   * likely meaning that the receiver does not hold
+   * the proper credentials to be able to read
+   * the received advertisement.
+   */
+  NP_FFI_DESERIALIZED_V0_ADVERTISEMENT_KIND_NO_MATCHING_CREDENTIALS = 1,
+};
+typedef uint8_t np_ffi_DeserializedV0AdvertisementKind;
+
+/**
+ * Represents deserialized information about the V0 identity utilized
+ * by a deserialized V0 advertisement
+ */
+typedef enum {
+  NP_FFI_DESERIALIZED_V0_IDENTITY_PLAINTEXT,
+  NP_FFI_DESERIALIZED_V0_IDENTITY_DECRYPTED,
+} np_ffi_DeserializedV0Identity;
+
+/**
+ * Discriminant for `DeserializedV0Identity`.
+ */
+enum np_ffi_DeserializedV0IdentityKind {
+  /**
+   * The deserialized identity was a plaintext identity.
+   */
+  NP_FFI_DESERIALIZED_V0_IDENTITY_KIND_PLAINTEXT = 0,
+  /**
+   * The deserialized identity was some decrypted identity.
+   */
+  NP_FFI_DESERIALIZED_V0_IDENTITY_KIND_DECRYPTED = 1,
+};
+typedef uint8_t np_ffi_DeserializedV0IdentityKind;
+
+/**
+ * Discriminant for `DeserializedV1Identity`.
+ */
+enum np_ffi_DeserializedV1IdentityKind {
+  /**
+   * The deserialized v1 identity was plaintext
+   */
+  NP_FFI_DESERIALIZED_V1_IDENTITY_KIND_PLAINTEXT = 0,
+  /**
+   * The deserialized v1 identity corresponded
+   * to some kind of decrypted identity.
+   */
+  NP_FFI_DESERIALIZED_V1_IDENTITY_KIND_DECRYPTED = 1,
+};
+typedef uint8_t np_ffi_DeserializedV1IdentityKind;
+
+/**
+ * Discriminant of `GetV0DEResult`.
+ */
+enum np_ffi_GetV0DEResultKind {
+  /**
+   * The attempt to get the DE succeeded.
+   * The associated payload may be obtained via
+   * `GetV0DEResult#into_success`.
+   */
+  NP_FFI_GET_V0DE_RESULT_KIND_SUCCESS = 0,
+  /**
+   * The attempt to get the DE failed,
+   * possibly due to the requested index being
+   * out-of-bounds or due to the advertisement
+   * having been previously deallocated.
+   */
+  NP_FFI_GET_V0DE_RESULT_KIND_ERROR = 1,
+};
+typedef uint8_t np_ffi_GetV0DEResultKind;
+
+/**
+ * Discriminant for the `GetV1DEResult` enum.
+ */
+enum np_ffi_GetV1DEResultKind {
+  /**
+   * Attempting to get the DE at the given position failed,
+   * possibly due to the index being out-of-bounds or due
+   * to the whole advertisement having been previously deallocated.
+   */
+  NP_FFI_GET_V1DE_RESULT_KIND_ERROR = 0,
+  /**
+   * Attempting to get the DE at the given position succeeded.
+   * The underlying DE may be extracted with `GetV1DEResult#into_success`.
+   */
+  NP_FFI_GET_V1DE_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_GetV1DEResultKind;
+
+/**
+ * Discriminant for `GetV1SectionResult`
+ */
+enum np_ffi_GetV1SectionResultKind {
+  /**
+   * The attempt to get the section failed,
+   * possibly due to the section index being
+   * out-of-bounds or due to the underlying
+   * advertisement having already been deallocated.
+   */
+  NP_FFI_GET_V1_SECTION_RESULT_KIND_ERROR = 0,
+  /**
+   * The attempt to get the section succeeded.
+   * The wrapped section may be obtained via
+   * `GetV1SectionResult#into_success`.
+   */
+  NP_FFI_GET_V1_SECTION_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_GetV1SectionResultKind;
+
+/**
+ * Structure for categorized reasons for why a NP C FFI call may
+ * be panicking.
+ */
+enum np_ffi_PanicReason {
+  /**
+   * Some enum cast to a variant failed. Utilized
+   * for failed enum casts of all enums.
+   *
+   * (That is, this is the catch-all panic reason for enum
+   * casts where there is not a more specific reason
+   * in some other variant of this enum.)
+   */
+  NP_FFI_PANIC_REASON_ENUM_CAST_FAILED = 0,
+  /**
+   * The panic handler is used to assert conditions are true to avoid programmer errors.
+   * If a failed assert condition is hit, this panic handler is invoked with this reason.
+   */
+  NP_FFI_PANIC_REASON_ASSERT_FAILED = 1,
+  /**
+   * Error returned if action bits inside of a V0Actions struct are invalid. If the struct was
+   * created by this deserializer, the bits will always be valid, they are only invalid if
+   * a user reaches in and changes them to something invalid.
+   */
+  NP_FFI_PANIC_REASON_INVALID_ACTION_BITS = 2,
+};
+typedef uint8_t np_ffi_PanicReason;
+
+/**
+ * Discriminant for `V0DataElement`.
+ */
+enum np_ffi_V0DataElementKind {
+  /**
+   * A transmission Power (Tx Power) data-element.
+   * The associated payload may be obtained via
+   * `V0DataElement#into_tx_power`.
+   */
+  NP_FFI_V0_DATA_ELEMENT_KIND_TX_POWER = 0,
+  /**
+   * The Actions data-element.
+   * The associated payload may be obtained via
+   * `V0DataElement#into_actions`.
+   */
+  NP_FFI_V0_DATA_ELEMENT_KIND_ACTIONS = 1,
+};
+typedef uint8_t np_ffi_V0DataElementKind;
+
+/**
+ *A `#[repr(C)]` handle to a value of type `super::CredentialBookInternals`.
+ */
+typedef struct {
+  uint64_t handle_id;
+} np_ffi_CredentialBook;
+
+/**
+ * Result type for `create_credential_book`
+ */
+enum np_ffi_CreateCredentialBookResult_Tag {
+  NP_FFI_CREATE_CREDENTIAL_BOOK_RESULT_NO_SPACE_LEFT = 0,
+  NP_FFI_CREATE_CREDENTIAL_BOOK_RESULT_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_CreateCredentialBookResult_Tag;
+
+typedef union {
+  np_ffi_CreateCredentialBookResult_Tag tag;
+  struct {
+    np_ffi_CreateCredentialBookResult_Tag success_tag;
+    np_ffi_CredentialBook success;
+  };
+} np_ffi_CreateCredentialBookResult;
+
+/**
+ *A `#[repr(C)]` handle to a value of type `super::V0PayloadInternals`.
+ */
+typedef struct {
+  uint64_t handle_id;
+} np_ffi_V0Payload;
+
+/**
+ * Represents a deserialized V0 advertisement whose DE contents may be read
+ */
+typedef struct {
+  uint8_t num_des;
+  np_ffi_V0Payload payload;
+  np_ffi_DeserializedV0Identity identity;
+} np_ffi_LegibleDeserializedV0Advertisement;
+
+/**
+ * Represents a deserialized V0 advertisement
+ */
+typedef enum {
+  NP_FFI_DESERIALIZED_V0_ADVERTISEMENT_LEGIBLE,
+  NP_FFI_DESERIALIZED_V0_ADVERTISEMENT_NO_MATCHING_CREDENTIALS,
+} np_ffi_DeserializedV0Advertisement_Tag;
+
+typedef struct {
+  np_ffi_DeserializedV0Advertisement_Tag tag;
+  union {
+    struct {
+      np_ffi_LegibleDeserializedV0Advertisement legible;
+    };
+  };
+} np_ffi_DeserializedV0Advertisement;
+
+/**
+ *A `#[repr(C)]` handle to a value of type `super::LegibleV1SectionsInternals`.
+ */
+typedef struct {
+  uint64_t handle_id;
+} np_ffi_LegibleV1Sections;
+
+/**
+ * Representation of a deserialized V1 advertisement
+ */
+typedef struct {
+  uint8_t num_legible_sections;
+  uint8_t num_undecryptable_sections;
+  np_ffi_LegibleV1Sections legible_sections;
+} np_ffi_DeserializedV1Advertisement;
+
+/**
+ * The result of calling `np_ffi_deserialize_advertisement`.
+ * Must be explicitly deallocated after use with
+ * a corresponding `np_ffi_deallocate_deserialize_advertisement_result`
+ */
+enum np_ffi_DeserializeAdvertisementResult_Tag {
+  /**
+   * Deserializing the advertisement failed, for some reason or another.
+   * `DeserializeAdvertisementResultKind::Error` is the associated enum tag.
+   */
+  NP_FFI_DESERIALIZE_ADVERTISEMENT_RESULT_ERROR,
+  /**
+   * The advertisement was correctly deserialized, and it's a V0 advertisement.
+   * `DeserializeAdvertisementResultKind::V0` is the associated enum tag.
+   */
+  NP_FFI_DESERIALIZE_ADVERTISEMENT_RESULT_V0,
+  /**
+   * The advertisement was correctly deserialized, and it's a V1 advertisement.
+   * `DeserializeAdvertisementResultKind::V1` is the associated enum tag.
+   */
+  NP_FFI_DESERIALIZE_ADVERTISEMENT_RESULT_V1,
+};
+typedef uint8_t np_ffi_DeserializeAdvertisementResult_Tag;
+
+typedef union {
+  np_ffi_DeserializeAdvertisementResult_Tag tag;
+  struct {
+    np_ffi_DeserializeAdvertisementResult_Tag v0_tag;
+    np_ffi_DeserializedV0Advertisement v0;
+  };
+  struct {
+    np_ffi_DeserializeAdvertisementResult_Tag v1_tag;
+    np_ffi_DeserializedV1Advertisement v1;
+  };
+} np_ffi_DeserializeAdvertisementResult;
+
+/**
+ * A byte-string with a maximum size of N,
+ * where only the first `len` bytes are considered
+ * to contain the actual payload. N is only
+ * permitted to be between 0 and 255.
+ */
+typedef struct {
+  uint8_t len;
+  uint8_t bytes[255];
+} np_ffi_ByteBuffer_255;
+
+/**
+ * Represents the raw contents of the service payload data
+ * under the Nearby Presence service UUID
+ */
+typedef struct {
+  np_ffi_ByteBuffer_255 bytes;
+} np_ffi_RawAdvertisementPayload;
+
+/**
+ * Representation of a transmission power,
+ * as used for the Tx Power DE in V0 and V1.
+ */
+typedef struct {
+  int8_t tx_power;
+} np_ffi_TxPower;
+
+/**
+ * The bitfield data of a VOActions data element
+ */
+typedef struct {
+  uint32_t bitfield;
+} np_ffi_V0ActionBits;
+
+/**
+ * Representation of the Actions DE in V0.
+ */
+typedef enum {
+  /**
+   * A set of action bits which were present in a plaintext identity advertisement
+   */
+  NP_FFI_V0_ACTIONS_PLAINTEXT,
+  /**
+   * A set of action bits which were present in a encrypted identity advertisement
+   */
+  NP_FFI_V0_ACTIONS_ENCRYPTED,
+} np_ffi_V0Actions_Tag;
+
+typedef struct {
+  np_ffi_V0Actions_Tag tag;
+  union {
+    struct {
+      np_ffi_V0ActionBits plaintext;
+    };
+    struct {
+      np_ffi_V0ActionBits encrypted;
+    };
+  };
+} np_ffi_V0Actions;
+
+/**
+ * Representation of a V0 data element.
+ */
+typedef enum {
+  NP_FFI_V0_DATA_ELEMENT_TX_POWER,
+  NP_FFI_V0_DATA_ELEMENT_ACTIONS,
+} np_ffi_V0DataElement_Tag;
+
+typedef struct {
+  np_ffi_V0DataElement_Tag tag;
+  union {
+    struct {
+      np_ffi_TxPower tx_power;
+    };
+    struct {
+      np_ffi_V0Actions actions;
+    };
+  };
+} np_ffi_V0DataElement;
+
+/**
+ * The result of `V0Payload#get_de`.
+ */
+typedef enum {
+  NP_FFI_GET_V0DE_RESULT_SUCCESS,
+  NP_FFI_GET_V0DE_RESULT_ERROR,
+} np_ffi_GetV0DEResult_Tag;
+
+typedef struct {
+  np_ffi_GetV0DEResult_Tag tag;
+  union {
+    struct {
+      np_ffi_V0DataElement success;
+    };
+  };
+} np_ffi_GetV0DEResult;
+
+/**
+ * Handle to a deserialized V1 section
+ */
+typedef struct {
+  np_ffi_LegibleV1Sections legible_sections_handle;
+  uint8_t legible_section_index;
+  uint8_t num_des;
+  np_ffi_DeserializedV1IdentityKind identity_tag;
+} np_ffi_DeserializedV1Section;
+
+/**
+ * The result of attempting to get a particular V1 section
+ * from its' index within the list of legible sections
+ * via `DeserializedV1Advertisement::get_section`.
+ */
+typedef enum {
+  NP_FFI_GET_V1_SECTION_RESULT_ERROR,
+  NP_FFI_GET_V1_SECTION_RESULT_SUCCESS,
+} np_ffi_GetV1SectionResult_Tag;
+
+typedef struct {
+  np_ffi_GetV1SectionResult_Tag tag;
+  union {
+    struct {
+      np_ffi_DeserializedV1Section success;
+    };
+  };
+} np_ffi_GetV1SectionResult;
+
+/**
+ * Representation of the data-element type tag
+ * of a V1 data element.
+ */
+typedef struct {
+  uint32_t code;
+} np_ffi_V1DEType;
+
+/**
+ * A byte-string with a maximum size of N,
+ * where only the first `len` bytes are considered
+ * to contain the actual payload. N is only
+ * permitted to be between 0 and 255.
+ */
+typedef struct {
+  uint8_t len;
+  uint8_t bytes[127];
+} np_ffi_ByteBuffer_127;
+
+/**
+ * FFI-transmissible representation of a generic V1 data-element.
+ * This representation is stable, and so you may directly
+ * reference this struct's fields if you wish.
+ */
+typedef struct {
+  /**
+   * The DE type code of this generic data-element.
+   */
+  np_ffi_V1DEType de_type;
+  /**
+   * The raw data-element byte payload, up to
+   * 127 bytes in length.
+   */
+  np_ffi_ByteBuffer_127 payload;
+} np_ffi_GenericV1DataElement;
+
+/**
+ * FFI-transmissible representation of a V1 data-element
+ */
+typedef enum {
+  /**
+   * A "generic" V1 data-element, for which we have no
+   * particular information about its schema (just
+   * a DE type code and a byte payload.)
+   */
+  NP_FFI_V1_DATA_ELEMENT_GENERIC,
+} np_ffi_V1DataElement_Tag;
+
+typedef struct {
+  np_ffi_V1DataElement_Tag tag;
+  union {
+    struct {
+      np_ffi_GenericV1DataElement generic;
+    };
+  };
+} np_ffi_V1DataElement;
+
+/**
+ * Represents the result of the `DeserializedV1Section#get_de` operation.
+ */
+typedef enum {
+  NP_FFI_GET_V1DE_RESULT_ERROR,
+  NP_FFI_GET_V1DE_RESULT_SUCCESS,
+} np_ffi_GetV1DEResult_Tag;
+
+typedef struct {
+  np_ffi_GetV1DEResult_Tag tag;
+  union {
+    struct {
+      np_ffi_V1DataElement success;
+    };
+  };
+} np_ffi_GetV1DEResult;
+
+/**
+ * Overrides the global panic handler to be used when NP C FFI calls panic.
+ * This method will only have an effect on the global panic-handler
+ * the first time it's called, and this method will return `true`
+ * to indicate that the panic handler was successfully set.
+ * All subsequent calls to this method
+ * will simply ignore the argument and return `false`.
+ *
+ * If the passed function pointer is non-null,
+ * then we will call it upon every panic,
+ * followed by the default panicking behavior for
+ * the platform (in the case where the user-specified
+ * function does not terminate or hang the running process.)
+ *
+ * Otherwise, we will resort to the
+ * default panicking behavior for the system, which
+ * is a printed stack trace followed by an abort
+ * when this crate is compiled with `std`,
+ * but a bare `loop { }` when this crate is compiled without.
+ */
+bool np_ffi_global_config_panic_handler(void (*handler)(np_ffi_PanicReason));
+
+/**
+ * Sets an override to the number of shards to employ in the NP FFI's
+ * internal handle-maps, which places an upper bound on the number
+ * of writing threads which may make progress at any one time
+ * when concurrently accessing handles of the same type.
+ *
+ * By default, this value will be set to 16, or in `std` environments,
+ * the minimum of 16 and the number of available hardware threads.
+ * A shard value override of zero will be interpreted the same
+ * as this default.
+ *
+ * Setting this value will have no effect if the handle-maps for the
+ * API have already begun being used by the client code, and any
+ * values set will take effect upon the first usage of _any_ non-`np_ffi_global_config_set`
+ * API call.
+ */
+void np_ffi_global_config_set_num_shards(uint8_t num_shards);
+
+/**
+ * Sets the maximum number of active handles to credential books
+ * which may be active at any one time.
+ * Default value: Max value.
+ * Max value: `u32::MAX - 1`.
+ *
+ * Useful for bounding the maximum memory used by the client application
+ * on credential books in constrained-memory environments.
+ *
+ * Setting this value will have no effect if the handle-maps for the
+ * API have already begun being used by the client code, and any
+ * values set will take effect upon the first usage of any API
+ * call utilizing credential books.
+ */
+void np_ffi_global_config_set_max_num_credential_books(uint32_t max_num_credential_books);
+
+/**
+ * Sets the maximum number of active handles to deserialized v0
+ * advertisements which may be active at any one time.
+ *
+ * Useful for bounding the maximum memory used by the client application
+ * on v0 advertisements in constrained-memory environments.
+ *
+ * Default value: Max value.
+ * Max value: `u32::MAX - 1`.
+ *
+ * Setting this value will have no effect if the handle-maps for the
+ * API have already begun being used by the client code, and any
+ * values set will take effect upon the first usage of any API
+ * call which references or returns a deserialized V0 advertisement.
+ */
+void np_ffi_global_config_set_max_num_deserialized_v0_advertisements(uint32_t max_num_deserialized_v0_advertisements);
+
+/**
+ * Sets the maximum number of active handles to deserialized v1
+ * advertisements which may be active at any one time.
+ *
+ * Useful for bounding the maximum memory used by the client application
+ * on v1 advertisements in constrained-memory environments.
+ *
+ * Default value: Max value.
+ * Max value: `u32::MAX - 1`.
+ *
+ * Setting this value will have no effect if the handle-maps for the
+ * API have already begun being used by the client code, and any
+ * values set will take effect upon the first usage of any API
+ * call which references or returns a deserialized V1 advertisement.
+ */
+void np_ffi_global_config_set_max_num_deserialized_v1_advertisements(uint32_t max_num_deserialized_v1_advertisements);
+
+/**
+ * Allocates a new credential-book, returning a handle to the created object
+ */
+np_ffi_CreateCredentialBookResult np_ffi_create_credential_book(void);
+
+/**
+ * Gets the tag of a `CreateCredentialBookResult` tagged enum.
+ */
+np_ffi_CreateCredentialBookResultKind np_ffi_CreateCredentialBookResult_kind(np_ffi_CreateCredentialBookResult result);
+
+/**
+ * Casts a `CreateCredentialBookResult` to the `SUCCESS` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_CredentialBook np_ffi_CreateCredentialBookResult_into_SUCCESS(np_ffi_CreateCredentialBookResult result);
+
+/**
+ * Deallocates a credential-book by its handle
+ */
+np_ffi_DeallocateResult np_ffi_deallocate_credential_book(np_ffi_CredentialBook credential_book);
+
+/**
+ * Attempts to deserialize an advertisement with the given service-data
+ * payload (presumed to be under the NP service UUID) using credentials
+ * pulled from the given credential-book.
+ */
+np_ffi_DeserializeAdvertisementResult np_ffi_deserialize_advertisement(np_ffi_RawAdvertisementPayload adv_payload,
+                                                                       np_ffi_CredentialBook credential_book);
+
+/**
+ * Gets the tag of a `DeserializeAdvertisementResult` tagged-union.
+ */
+np_ffi_DeserializeAdvertisementResultKind np_ffi_DeserializeAdvertisementResult_kind(np_ffi_DeserializeAdvertisementResult result);
+
+/**
+ * Casts a `DeserializeAdvertisementResult` to the `V0` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_DeserializedV0Advertisement np_ffi_DeserializeAdvertisementResult_into_V0(np_ffi_DeserializeAdvertisementResult result);
+
+/**
+ * Casts a `DeserializeAdvertisementResult` to the `V1` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_DeserializedV1Advertisement np_ffi_DeserializeAdvertisementResult_into_V1(np_ffi_DeserializeAdvertisementResult result);
+
+/**
+ * Deallocates any internal data referenced by a `DeserializeAdvertisementResult`. This should only
+ * be used if into_V0 or into_V1, have not been called yet as it shares the same underlying
+ * resource.
+ */
+np_ffi_DeallocateResult np_ffi_deallocate_deserialize_advertisement_result(np_ffi_DeserializeAdvertisementResult result);
+
+/**
+ * Deallocates any internal data referenced by a `DeserializedV0Advertisement`
+ */
+np_ffi_DeallocateResult np_ffi_deallocate_deserialized_V0_advertisement(np_ffi_DeserializedV0Advertisement adv);
+
+/**
+ * Deallocates any internal data referenced by a `DeserializedV1Advertisement`
+ */
+np_ffi_DeallocateResult np_ffi_deallocate_deserialized_V1_advertisement(np_ffi_DeserializedV1Advertisement adv);
+
+/**
+ * Gets the tag of a `DeserializedV0Advertisement` tagged-union.
+ */
+np_ffi_DeserializedV0AdvertisementKind np_ffi_DeserializedV0Advertisement_kind(np_ffi_DeserializedV0Advertisement result);
+
+/**
+ * Casts a `DeserializedV0Advertisement` to the `Legible` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_LegibleDeserializedV0Advertisement np_ffi_DeserializedV0Advertisement_into_LEGIBLE(np_ffi_DeserializedV0Advertisement adv);
+
+/**
+ * Gets the number of DEs in a legible deserialized advertisement.
+ * Suitable as an iteration bound for `V0Payload#get_de`.
+ */
+uint8_t np_ffi_LegibleDeserializedV0Advertisement_get_num_des(np_ffi_LegibleDeserializedV0Advertisement adv);
+
+/**
+ * Gets just the data-element payload of a `LegibleDeserializedV0Advertisement`.
+ */
+np_ffi_V0Payload np_ffi_LegibleDeserializedV0Advertisement_into_payload(np_ffi_LegibleDeserializedV0Advertisement adv);
+
+/**
+ * Gets just the identity information associated with a `LegibleDeserializedV0Advertisement`.
+ */
+np_ffi_DeserializedV0Identity np_ffi_LegibleDeserializedV0Advertisement_into_identity(np_ffi_LegibleDeserializedV0Advertisement adv);
+
+/**
+ * Deallocates any internal data of a `LegibleDeserializedV0Advertisement`
+ */
+np_ffi_DeallocateResult np_ffi_deallocate_legible_v0_advertisement(np_ffi_LegibleDeserializedV0Advertisement adv);
+
+/**
+ * Gets the tag of the `DeserializedV0Identity` tagged-union.
+ */
+np_ffi_DeserializedV0IdentityKind np_ffi_DeserializedV0Identity_kind(np_ffi_DeserializedV0Identity identity);
+
+/**
+ * Attempts to get the data-element with the given index in the passed v0 adv payload
+ */
+np_ffi_GetV0DEResult np_ffi_V0Payload_get_de(np_ffi_V0Payload payload, uint8_t index);
+
+/**
+ * Deallocates any internal data of a `V0Payload`
+ */
+np_ffi_DeallocateResult np_ffi_deallocate_v0_payload(np_ffi_V0Payload payload);
+
+/**
+ * Gets the tag of a `GetV0DEResult` tagged-union.
+ */
+np_ffi_GetV0DEResultKind np_ffi_GetV0DEResult_kind(np_ffi_GetV0DEResult result);
+
+/**
+ * Casts a `GetV0DEResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_V0DataElement np_ffi_GetV0DEResult_into_SUCCESS(np_ffi_GetV0DEResult result);
+
+/**
+ * Gets the tag of a `V0DataElement` tagged-union.
+ */
+np_ffi_V0DataElementKind np_ffi_V0DataElement_kind(np_ffi_V0DataElement de);
+
+/**
+ * Casts a `V0DataElement` to the `TxPower` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_TxPower np_ffi_V0DataElement_into_TX_POWER(np_ffi_V0DataElement de);
+
+/**
+ * Casts a `V0DataElement` to the `Actions` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_V0Actions np_ffi_V0DataElement_into_ACTIONS(np_ffi_V0DataElement de);
+
+/**
+ * Return whether a boolean action type is set in this data element
+ */
+bool np_ffi_V0Actions_has_action(np_ffi_V0Actions actions, np_ffi_BooleanActionType action_type);
+
+/**
+ * Gets the 4 bit context sync sequence number as a u8 from this data element
+ */
+uint8_t np_ffi_V0Actions_get_context_sync_sequence_number(np_ffi_V0Actions actions);
+
+/**
+ * Return whether a boolean action type is set in this data element
+ */
+uint32_t np_ffi_V0Actions_as_u32(np_ffi_V0Actions actions);
+
+/**
+ * Gets the number of legible sections on a deserialized V1 advertisement.
+ * Suitable as an index bound for the second argument of
+ * `np_ffi_DeserializedV1Advertisement#get_section`.
+ */
+uint8_t np_ffi_DeserializedV1Advertisement_get_num_legible_sections(np_ffi_DeserializedV1Advertisement adv);
+
+/**
+ * Gets the number of sections on a deserialized V1 advertisement which
+ * were unable to be decrypted with the credentials that the receiver possesses.
+ */
+uint8_t np_ffi_DeserializedV1Advertisement_get_num_undecryptable_sections(np_ffi_DeserializedV1Advertisement adv);
+
+/**
+ * Gets the legible section with the given index in a deserialized V1 advertisement.
+ */
+np_ffi_GetV1SectionResult np_ffi_DeserializedV1Advertisement_get_section(np_ffi_DeserializedV1Advertisement adv,
+                                                                         uint8_t legible_section_index);
+
+/**
+ * Gets the tag of the `GetV1SectionResult` tagged-union.
+ */
+np_ffi_GetV1SectionResultKind np_ffi_GetV1SectionResult_kind(np_ffi_GetV1SectionResult result);
+
+/**
+ * Casts a `GetV1SectionResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_DeserializedV1Section np_ffi_GetV1SectionResult_into_SUCCESS(np_ffi_GetV1SectionResult result);
+
+/**
+ * Gets the number of data elements in a deserialized v1 section.
+ * Suitable as an iteration bound for the second argument of
+ * `np_ffi_DeserializedV1Section_get_de`.
+ */
+uint8_t np_ffi_DeserializedV1Section_get_num_des(np_ffi_DeserializedV1Section section);
+
+/**
+ * Gets the tag of the identity tagged-union used for the passed section.
+ */
+np_ffi_DeserializedV1IdentityKind np_ffi_DeserializedV1Section_get_identity_kind(np_ffi_DeserializedV1Section section);
+
+/**
+ * Gets the data-element with the given index in the passed section.
+ */
+np_ffi_GetV1DEResult np_ffi_DeserializedV1Section_get_de(np_ffi_DeserializedV1Section section,
+                                                         uint8_t de_index);
+
+/**
+ * Gets the tag of the `GetV1DEResult` tagged-union.
+ */
+np_ffi_GetV1DEResultKind np_ffi_GetV1DEResult_kind(np_ffi_GetV1DEResult result);
+
+/**
+ * Casts a `GetV1DEResult` to the `Success` vartiant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_V1DataElement np_ffi_GetV1DEResult_into_SUCCESS(np_ffi_GetV1DEResult result);
+
+/**
+ * Converts a `V1DataElement` to a `GenericV1DataElement` which
+ * only maintains information about the DE's type-code and payload.
+ */
+np_ffi_GenericV1DataElement np_ffi_V1DataElement_to_generic(np_ffi_V1DataElement de);
+
+/**
+ * Extracts the numerical value of the given V1 DE type code as
+ * an unsigned 32-bit integer.
+ */
+uint32_t np_ffi_V1DEType_to_uint32_t(np_ffi_V1DEType de_type);
diff --git a/nearby/presence/np_c_ffi/include/cpp/np_cpp_ffi_functions.h b/nearby/presence/np_c_ffi/include/cpp/np_cpp_ffi_functions.h
new file mode 100644
index 0000000..3361c5d
--- /dev/null
+++ b/nearby/presence/np_c_ffi/include/cpp/np_cpp_ffi_functions.h
@@ -0,0 +1,268 @@
+/*
+ Copyright 2023 Google LLC
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+
+#pragma once
+
+/* Generated with cbindgen:0.24.5 */
+
+/*
+ WARNING: this file is autogenerated by cbindgen. Don't modify this manually.
+ Additionally, you should _not_ rely upon the layouts of the generated
+ structs and unions if you want your code to be forward-compatible,
+ unless a given type explicitly states in its documentation that it has
+ a guaranteed forward-compatible layout.
+ Instead, you should use _only_ the provided exported function symbols.
+*/
+
+#include <cstdarg>
+#include <cstdint>
+#include <cstdlib>
+#include <ostream>
+#include <new>
+#include "np_cpp_ffi_types.h"
+
+namespace np_ffi {
+namespace internal {
+
+extern "C" {
+
+/// Overrides the global panic handler to be used when NP C FFI calls panic.
+/// This method will only have an effect on the global panic-handler
+/// the first time it's called, and this method will return `true`
+/// to indicate that the panic handler was successfully set.
+/// All subsequent calls to this method
+/// will simply ignore the argument and return `false`.
+///
+/// If the passed function pointer is non-null,
+/// then we will call it upon every panic,
+/// followed by the default panicking behavior for
+/// the platform (in the case where the user-specified
+/// function does not terminate or hang the running process.)
+///
+/// Otherwise, we will resort to the
+/// default panicking behavior for the system, which
+/// is a printed stack trace followed by an abort
+/// when this crate is compiled with `std`,
+/// but a bare `loop { }` when this crate is compiled without.
+bool np_ffi_global_config_panic_handler(void (*handler)(PanicReason));
+
+/// Sets an override to the number of shards to employ in the NP FFI's
+/// internal handle-maps, which places an upper bound on the number
+/// of writing threads which may make progress at any one time
+/// when concurrently accessing handles of the same type.
+///
+/// By default, this value will be set to 16, or in `std` environments,
+/// the minimum of 16 and the number of available hardware threads.
+/// A shard value override of zero will be interpreted the same
+/// as this default.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of _any_ non-`np_ffi_global_config_set`
+/// API call.
+void np_ffi_global_config_set_num_shards(uint8_t num_shards);
+
+/// Sets the maximum number of active handles to credential books
+/// which may be active at any one time.
+/// Default value: Max value.
+/// Max value: `u32::MAX - 1`.
+///
+/// Useful for bounding the maximum memory used by the client application
+/// on credential books in constrained-memory environments.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call utilizing credential books.
+void np_ffi_global_config_set_max_num_credential_books(uint32_t max_num_credential_books);
+
+/// Sets the maximum number of active handles to deserialized v0
+/// advertisements which may be active at any one time.
+///
+/// Useful for bounding the maximum memory used by the client application
+/// on v0 advertisements in constrained-memory environments.
+///
+/// Default value: Max value.
+/// Max value: `u32::MAX - 1`.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call which references or returns a deserialized V0 advertisement.
+void np_ffi_global_config_set_max_num_deserialized_v0_advertisements(uint32_t max_num_deserialized_v0_advertisements);
+
+/// Sets the maximum number of active handles to deserialized v1
+/// advertisements which may be active at any one time.
+///
+/// Useful for bounding the maximum memory used by the client application
+/// on v1 advertisements in constrained-memory environments.
+///
+/// Default value: Max value.
+/// Max value: `u32::MAX - 1`.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call which references or returns a deserialized V1 advertisement.
+void np_ffi_global_config_set_max_num_deserialized_v1_advertisements(uint32_t max_num_deserialized_v1_advertisements);
+
+/// Allocates a new credential-book, returning a handle to the created object
+CreateCredentialBookResult np_ffi_create_credential_book();
+
+/// Gets the tag of a `CreateCredentialBookResult` tagged enum.
+CreateCredentialBookResultKind np_ffi_CreateCredentialBookResult_kind(CreateCredentialBookResult result);
+
+/// Casts a `CreateCredentialBookResult` to the `SUCCESS` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+CredentialBook np_ffi_CreateCredentialBookResult_into_SUCCESS(CreateCredentialBookResult result);
+
+/// Deallocates a credential-book by its handle
+DeallocateResult np_ffi_deallocate_credential_book(CredentialBook credential_book);
+
+/// Attempts to deserialize an advertisement with the given service-data
+/// payload (presumed to be under the NP service UUID) using credentials
+/// pulled from the given credential-book.
+DeserializeAdvertisementResult np_ffi_deserialize_advertisement(RawAdvertisementPayload adv_payload,
+                                                                CredentialBook credential_book);
+
+/// Gets the tag of a `DeserializeAdvertisementResult` tagged-union.
+DeserializeAdvertisementResultKind np_ffi_DeserializeAdvertisementResult_kind(DeserializeAdvertisementResult result);
+
+/// Casts a `DeserializeAdvertisementResult` to the `V0` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+DeserializedV0Advertisement np_ffi_DeserializeAdvertisementResult_into_V0(DeserializeAdvertisementResult result);
+
+/// Casts a `DeserializeAdvertisementResult` to the `V1` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+DeserializedV1Advertisement np_ffi_DeserializeAdvertisementResult_into_V1(DeserializeAdvertisementResult result);
+
+/// Deallocates any internal data referenced by a `DeserializeAdvertisementResult`. This should only
+/// be used if into_V0 or into_V1, have not been called yet as it shares the same underlying
+/// resource.
+DeallocateResult np_ffi_deallocate_deserialize_advertisement_result(DeserializeAdvertisementResult result);
+
+/// Deallocates any internal data referenced by a `DeserializedV0Advertisement`
+DeallocateResult np_ffi_deallocate_deserialized_V0_advertisement(DeserializedV0Advertisement adv);
+
+/// Deallocates any internal data referenced by a `DeserializedV1Advertisement`
+DeallocateResult np_ffi_deallocate_deserialized_V1_advertisement(DeserializedV1Advertisement adv);
+
+/// Gets the tag of a `DeserializedV0Advertisement` tagged-union.
+DeserializedV0AdvertisementKind np_ffi_DeserializedV0Advertisement_kind(DeserializedV0Advertisement result);
+
+/// Casts a `DeserializedV0Advertisement` to the `Legible` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+LegibleDeserializedV0Advertisement np_ffi_DeserializedV0Advertisement_into_LEGIBLE(DeserializedV0Advertisement adv);
+
+/// Gets the number of DEs in a legible deserialized advertisement.
+/// Suitable as an iteration bound for `V0Payload#get_de`.
+uint8_t np_ffi_LegibleDeserializedV0Advertisement_get_num_des(LegibleDeserializedV0Advertisement adv);
+
+/// Gets just the data-element payload of a `LegibleDeserializedV0Advertisement`.
+V0Payload np_ffi_LegibleDeserializedV0Advertisement_into_payload(LegibleDeserializedV0Advertisement adv);
+
+/// Gets just the identity information associated with a `LegibleDeserializedV0Advertisement`.
+DeserializedV0Identity np_ffi_LegibleDeserializedV0Advertisement_into_identity(LegibleDeserializedV0Advertisement adv);
+
+/// Deallocates any internal data of a `LegibleDeserializedV0Advertisement`
+DeallocateResult np_ffi_deallocate_legible_v0_advertisement(LegibleDeserializedV0Advertisement adv);
+
+/// Gets the tag of the `DeserializedV0Identity` tagged-union.
+DeserializedV0IdentityKind np_ffi_DeserializedV0Identity_kind(DeserializedV0Identity identity);
+
+/// Attempts to get the data-element with the given index in the passed v0 adv payload
+GetV0DEResult np_ffi_V0Payload_get_de(V0Payload payload, uint8_t index);
+
+/// Deallocates any internal data of a `V0Payload`
+DeallocateResult np_ffi_deallocate_v0_payload(V0Payload payload);
+
+/// Gets the tag of a `GetV0DEResult` tagged-union.
+GetV0DEResultKind np_ffi_GetV0DEResult_kind(GetV0DEResult result);
+
+/// Casts a `GetV0DEResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+V0DataElement np_ffi_GetV0DEResult_into_SUCCESS(GetV0DEResult result);
+
+/// Gets the tag of a `V0DataElement` tagged-union.
+V0DataElementKind np_ffi_V0DataElement_kind(V0DataElement de);
+
+/// Casts a `V0DataElement` to the `TxPower` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+TxPower np_ffi_V0DataElement_into_TX_POWER(V0DataElement de);
+
+/// Casts a `V0DataElement` to the `Actions` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+V0Actions np_ffi_V0DataElement_into_ACTIONS(V0DataElement de);
+
+/// Return whether a boolean action type is set in this data element
+bool np_ffi_V0Actions_has_action(V0Actions actions, BooleanActionType action_type);
+
+/// Gets the 4 bit context sync sequence number as a u8 from this data element
+uint8_t np_ffi_V0Actions_get_context_sync_sequence_number(V0Actions actions);
+
+/// Return whether a boolean action type is set in this data element
+uint32_t np_ffi_V0Actions_as_u32(V0Actions actions);
+
+/// Gets the number of legible sections on a deserialized V1 advertisement.
+/// Suitable as an index bound for the second argument of
+/// `np_ffi_DeserializedV1Advertisement#get_section`.
+uint8_t np_ffi_DeserializedV1Advertisement_get_num_legible_sections(DeserializedV1Advertisement adv);
+
+/// Gets the number of sections on a deserialized V1 advertisement which
+/// were unable to be decrypted with the credentials that the receiver possesses.
+uint8_t np_ffi_DeserializedV1Advertisement_get_num_undecryptable_sections(DeserializedV1Advertisement adv);
+
+/// Gets the legible section with the given index in a deserialized V1 advertisement.
+GetV1SectionResult np_ffi_DeserializedV1Advertisement_get_section(DeserializedV1Advertisement adv,
+                                                                  uint8_t legible_section_index);
+
+/// Gets the tag of the `GetV1SectionResult` tagged-union.
+GetV1SectionResultKind np_ffi_GetV1SectionResult_kind(GetV1SectionResult result);
+
+/// Casts a `GetV1SectionResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+DeserializedV1Section np_ffi_GetV1SectionResult_into_SUCCESS(GetV1SectionResult result);
+
+/// Gets the number of data elements in a deserialized v1 section.
+/// Suitable as an iteration bound for the second argument of
+/// `np_ffi_DeserializedV1Section_get_de`.
+uint8_t np_ffi_DeserializedV1Section_get_num_des(DeserializedV1Section section);
+
+/// Gets the tag of the identity tagged-union used for the passed section.
+DeserializedV1IdentityKind np_ffi_DeserializedV1Section_get_identity_kind(DeserializedV1Section section);
+
+/// Gets the data-element with the given index in the passed section.
+GetV1DEResult np_ffi_DeserializedV1Section_get_de(DeserializedV1Section section, uint8_t de_index);
+
+/// Gets the tag of the `GetV1DEResult` tagged-union.
+GetV1DEResultKind np_ffi_GetV1DEResult_kind(GetV1DEResult result);
+
+/// Casts a `GetV1DEResult` to the `Success` vartiant, panicking in the
+/// case where the passed value is of a different enum variant.
+V1DataElement np_ffi_GetV1DEResult_into_SUCCESS(GetV1DEResult result);
+
+/// Converts a `V1DataElement` to a `GenericV1DataElement` which
+/// only maintains information about the DE's type-code and payload.
+GenericV1DataElement np_ffi_V1DataElement_to_generic(V1DataElement de);
+
+/// Extracts the numerical value of the given V1 DE type code as
+/// an unsigned 32-bit integer.
+uint32_t np_ffi_V1DEType_to_uint32_t(V1DEType de_type);
+
+} // extern "C"
+
+} // namespace internal
+} // namespace np_ffi
diff --git a/nearby/presence/np_c_ffi/include/cpp/np_cpp_ffi_types.h b/nearby/presence/np_c_ffi/include/cpp/np_cpp_ffi_types.h
new file mode 100644
index 0000000..4d66308
--- /dev/null
+++ b/nearby/presence/np_c_ffi/include/cpp/np_cpp_ffi_types.h
@@ -0,0 +1,456 @@
+/*
+ Copyright 2023 Google LLC
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+
+#pragma once
+
+/* Generated with cbindgen:0.24.5 */
+
+/*
+ WARNING: this file is autogenerated by cbindgen. Don't modify this manually.
+ Additionally, you should _not_ rely upon the layouts of the generated
+ structs and unions if you want your code to be forward-compatible,
+ unless a given type explicitly states in its documentation that it has
+ a guaranteed forward-compatible layout.
+ Instead, you should use _only_ the provided exported function symbols.
+*/
+
+#include <cstdarg>
+#include <cstdint>
+#include <cstdlib>
+#include <ostream>
+#include <new>
+
+namespace np_ffi {
+namespace internal {
+
+/// The possible boolean action types which can be present in an Actions data element
+enum class BooleanActionType : uint8_t {
+  ActiveUnlock = 8,
+  NearbyShare = 9,
+  InstantTethering = 10,
+  PhoneHub = 11,
+  PresenceManager = 12,
+  Finder = 13,
+  FastPairSass = 14,
+};
+
+/// Discriminant for `CreateCredentialBookResult`
+enum class CreateCredentialBookResultKind : uint8_t {
+  /// There was no space left to create a new credential book
+  NoSpaceLeft = 0,
+  /// We created a new credential book behind the given handle.
+  /// The associated payload may be obtained via
+  /// `CreateCredentialBookResult#into_success()`.
+  Success = 1,
+};
+
+/// A result-type enum which tells the caller whether/not a deallocation
+/// succeeded or failed due to the requested handle not being present.
+enum class DeallocateResult {
+  /// The requested handle to deallocate was not present in the map
+  NotPresent = 0,
+  /// The object behind the handle was successfully deallocated
+  Success = 1,
+};
+
+/// Discriminant for `DeserializeAdvertisementResult`.
+enum class DeserializeAdvertisementResultKind : uint8_t {
+  /// Deserializing the advertisement failed, for some reason or another.
+  Error = 0,
+  /// The advertisement was correctly deserialized, and it's a V0 advertisement.
+  /// `DeserializeAdvertisementResult#into_v0()` is the corresponding cast
+  /// to the associated enum variant.
+  V0 = 1,
+  /// The advertisement was correctly deserialized, and it's a V1 advertisement.
+  /// `DeserializeAdvertisementResult#into_v1()` is the corresponding cast
+  /// to the associated enum variant.
+  V1 = 2,
+};
+
+/// Discriminant for possible results of V0 advertisement deserialization
+enum class DeserializedV0AdvertisementKind : uint8_t {
+  /// The deserialized V0 advertisement was legible.
+  /// The associated payload may be obtained via
+  /// `DeserializedV0Advertisement#into_legible`.
+  Legible = 0,
+  /// The deserialized V0 advertisement is illegible,
+  /// likely meaning that the receiver does not hold
+  /// the proper credentials to be able to read
+  /// the received advertisement.
+  NoMatchingCredentials = 1,
+};
+
+/// Represents deserialized information about the V0 identity utilized
+/// by a deserialized V0 advertisement
+enum class DeserializedV0Identity {
+  Plaintext,
+  Decrypted,
+};
+
+/// Discriminant for `DeserializedV0Identity`.
+enum class DeserializedV0IdentityKind : uint8_t {
+  /// The deserialized identity was a plaintext identity.
+  Plaintext = 0,
+  /// The deserialized identity was some decrypted identity.
+  Decrypted = 1,
+};
+
+/// Discriminant for `DeserializedV1Identity`.
+enum class DeserializedV1IdentityKind : uint8_t {
+  /// The deserialized v1 identity was plaintext
+  Plaintext = 0,
+  /// The deserialized v1 identity corresponded
+  /// to some kind of decrypted identity.
+  Decrypted = 1,
+};
+
+/// Discriminant of `GetV0DEResult`.
+enum class GetV0DEResultKind : uint8_t {
+  /// The attempt to get the DE succeeded.
+  /// The associated payload may be obtained via
+  /// `GetV0DEResult#into_success`.
+  Success = 0,
+  /// The attempt to get the DE failed,
+  /// possibly due to the requested index being
+  /// out-of-bounds or due to the advertisement
+  /// having been previously deallocated.
+  Error = 1,
+};
+
+/// Discriminant for the `GetV1DEResult` enum.
+enum class GetV1DEResultKind : uint8_t {
+  /// Attempting to get the DE at the given position failed,
+  /// possibly due to the index being out-of-bounds or due
+  /// to the whole advertisement having been previously deallocated.
+  Error = 0,
+  /// Attempting to get the DE at the given position succeeded.
+  /// The underlying DE may be extracted with `GetV1DEResult#into_success`.
+  Success = 1,
+};
+
+/// Discriminant for `GetV1SectionResult`
+enum class GetV1SectionResultKind : uint8_t {
+  /// The attempt to get the section failed,
+  /// possibly due to the section index being
+  /// out-of-bounds or due to the underlying
+  /// advertisement having already been deallocated.
+  Error = 0,
+  /// The attempt to get the section succeeded.
+  /// The wrapped section may be obtained via
+  /// `GetV1SectionResult#into_success`.
+  Success = 1,
+};
+
+/// Structure for categorized reasons for why a NP C FFI call may
+/// be panicking.
+enum class PanicReason : uint8_t {
+  /// Some enum cast to a variant failed. Utilized
+  /// for failed enum casts of all enums.
+  ///
+  /// (That is, this is the catch-all panic reason for enum
+  /// casts where there is not a more specific reason
+  /// in some other variant of this enum.)
+  EnumCastFailed = 0,
+  /// The panic handler is used to assert conditions are true to avoid programmer errors.
+  /// If a failed assert condition is hit, this panic handler is invoked with this reason.
+  AssertFailed = 1,
+  /// Error returned if action bits inside of a V0Actions struct are invalid. If the struct was
+  /// created by this deserializer, the bits will always be valid, they are only invalid if
+  /// a user reaches in and changes them to something invalid.
+  InvalidActionBits = 2,
+};
+
+/// Discriminant for `V0DataElement`.
+enum class V0DataElementKind : uint8_t {
+  /// A transmission Power (Tx Power) data-element.
+  /// The associated payload may be obtained via
+  /// `V0DataElement#into_tx_power`.
+  TxPower = 0,
+  /// The Actions data-element.
+  /// The associated payload may be obtained via
+  /// `V0DataElement#into_actions`.
+  Actions = 1,
+};
+
+///A `#[repr(C)]` handle to a value of type `super::CredentialBookInternals`.
+struct CredentialBook {
+  uint64_t handle_id;
+};
+
+/// Result type for `create_credential_book`
+union CreateCredentialBookResult {
+  enum class Tag : uint8_t {
+    NoSpaceLeft = 0,
+    Success = 1,
+  };
+
+  struct Success_Body {
+    Tag tag;
+    CredentialBook _0;
+  };
+
+  struct {
+    Tag tag;
+  };
+  Success_Body success;
+};
+
+///A `#[repr(C)]` handle to a value of type `super::V0PayloadInternals`.
+struct V0Payload {
+  uint64_t handle_id;
+};
+
+/// Represents a deserialized V0 advertisement whose DE contents may be read
+struct LegibleDeserializedV0Advertisement {
+  uint8_t num_des;
+  V0Payload payload;
+  DeserializedV0Identity identity;
+};
+
+/// Represents a deserialized V0 advertisement
+struct DeserializedV0Advertisement {
+  enum class Tag {
+    Legible,
+    NoMatchingCredentials,
+  };
+
+  struct Legible_Body {
+    LegibleDeserializedV0Advertisement _0;
+  };
+
+  Tag tag;
+  union {
+    Legible_Body legible;
+  };
+};
+
+///A `#[repr(C)]` handle to a value of type `super::LegibleV1SectionsInternals`.
+struct LegibleV1Sections {
+  uint64_t handle_id;
+};
+
+/// Representation of a deserialized V1 advertisement
+struct DeserializedV1Advertisement {
+  uint8_t num_legible_sections;
+  uint8_t num_undecryptable_sections;
+  LegibleV1Sections legible_sections;
+};
+
+/// The result of calling `np_ffi_deserialize_advertisement`.
+/// Must be explicitly deallocated after use with
+/// a corresponding `np_ffi_deallocate_deserialize_advertisement_result`
+union DeserializeAdvertisementResult {
+  enum class Tag : uint8_t {
+    /// Deserializing the advertisement failed, for some reason or another.
+    /// `DeserializeAdvertisementResultKind::Error` is the associated enum tag.
+    Error,
+    /// The advertisement was correctly deserialized, and it's a V0 advertisement.
+    /// `DeserializeAdvertisementResultKind::V0` is the associated enum tag.
+    V0,
+    /// The advertisement was correctly deserialized, and it's a V1 advertisement.
+    /// `DeserializeAdvertisementResultKind::V1` is the associated enum tag.
+    V1,
+  };
+
+  struct V0_Body {
+    Tag tag;
+    DeserializedV0Advertisement _0;
+  };
+
+  struct V1_Body {
+    Tag tag;
+    DeserializedV1Advertisement _0;
+  };
+
+  struct {
+    Tag tag;
+  };
+  V0_Body v0;
+  V1_Body v1;
+};
+
+/// A byte-string with a maximum size of N,
+/// where only the first `len` bytes are considered
+/// to contain the actual payload. N is only
+/// permitted to be between 0 and 255.
+template<uintptr_t N>
+struct ByteBuffer {
+  uint8_t len;
+  uint8_t bytes[N];
+};
+
+/// Represents the raw contents of the service payload data
+/// under the Nearby Presence service UUID
+struct RawAdvertisementPayload {
+  ByteBuffer<255> bytes;
+};
+
+/// Representation of a transmission power,
+/// as used for the Tx Power DE in V0 and V1.
+struct TxPower {
+  int8_t tx_power;
+};
+
+/// The bitfield data of a VOActions data element
+struct V0ActionBits {
+  uint32_t bitfield;
+};
+
+/// Representation of the Actions DE in V0.
+struct V0Actions {
+  enum class Tag {
+    /// A set of action bits which were present in a plaintext identity advertisement
+    Plaintext,
+    /// A set of action bits which were present in a encrypted identity advertisement
+    Encrypted,
+  };
+
+  struct Plaintext_Body {
+    V0ActionBits _0;
+  };
+
+  struct Encrypted_Body {
+    V0ActionBits _0;
+  };
+
+  Tag tag;
+  union {
+    Plaintext_Body plaintext;
+    Encrypted_Body encrypted;
+  };
+};
+
+/// Representation of a V0 data element.
+struct V0DataElement {
+  enum class Tag {
+    TxPower,
+    Actions,
+  };
+
+  struct TxPower_Body {
+    TxPower _0;
+  };
+
+  struct Actions_Body {
+    V0Actions _0;
+  };
+
+  Tag tag;
+  union {
+    TxPower_Body tx_power;
+    Actions_Body actions;
+  };
+};
+
+/// The result of `V0Payload#get_de`.
+struct GetV0DEResult {
+  enum class Tag {
+    Success,
+    Error,
+  };
+
+  struct Success_Body {
+    V0DataElement _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// Handle to a deserialized V1 section
+struct DeserializedV1Section {
+  LegibleV1Sections legible_sections_handle;
+  uint8_t legible_section_index;
+  uint8_t num_des;
+  DeserializedV1IdentityKind identity_tag;
+};
+
+/// The result of attempting to get a particular V1 section
+/// from its' index within the list of legible sections
+/// via `DeserializedV1Advertisement::get_section`.
+struct GetV1SectionResult {
+  enum class Tag {
+    Error,
+    Success,
+  };
+
+  struct Success_Body {
+    DeserializedV1Section _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// Representation of the data-element type tag
+/// of a V1 data element.
+struct V1DEType {
+  uint32_t code;
+};
+
+/// FFI-transmissible representation of a generic V1 data-element.
+/// This representation is stable, and so you may directly
+/// reference this struct's fields if you wish.
+struct GenericV1DataElement {
+  /// The DE type code of this generic data-element.
+  V1DEType de_type;
+  /// The raw data-element byte payload, up to
+  /// 127 bytes in length.
+  ByteBuffer<127> payload;
+};
+
+/// FFI-transmissible representation of a V1 data-element
+struct V1DataElement {
+  enum class Tag {
+    /// A "generic" V1 data-element, for which we have no
+    /// particular information about its schema (just
+    /// a DE type code and a byte payload.)
+    Generic,
+  };
+
+  struct Generic_Body {
+    GenericV1DataElement _0;
+  };
+
+  Tag tag;
+  union {
+    Generic_Body generic;
+  };
+};
+
+/// Represents the result of the `DeserializedV1Section#get_de` operation.
+struct GetV1DEResult {
+  enum class Tag {
+    Error,
+    Success,
+  };
+
+  struct Success_Body {
+    V1DataElement _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+} // namespace internal
+} // namespace np_ffi
diff --git a/nearby/presence/np_c_ffi/rust-toolchain.toml b/nearby/presence/np_c_ffi/rust-toolchain.toml
new file mode 100644
index 0000000..271800c
--- /dev/null
+++ b/nearby/presence/np_c_ffi/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"
\ No newline at end of file
diff --git a/nearby/presence/np_c_ffi/src/credentials.rs b/nearby/presence/np_c_ffi/src/credentials.rs
new file mode 100644
index 0000000..6b60545
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/credentials.rs
@@ -0,0 +1,51 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Credential-related data-types and functions
+
+use crate::{unwrap, PanicReason};
+use np_ffi_core::common::*;
+use np_ffi_core::credentials::credential_book::CredentialBook;
+use np_ffi_core::credentials::*;
+use np_ffi_core::utils::FfiEnum;
+
+/// Allocates a new credential-book, returning a handle to the created object
+#[no_mangle]
+pub extern "C" fn np_ffi_create_credential_book() -> CreateCredentialBookResult {
+    create_credential_book()
+}
+
+/// Gets the tag of a `CreateCredentialBookResult` tagged enum.
+#[no_mangle]
+pub extern "C" fn np_ffi_CreateCredentialBookResult_kind(
+    result: CreateCredentialBookResult,
+) -> CreateCredentialBookResultKind {
+    result.kind()
+}
+
+/// Casts a `CreateCredentialBookResult` to the `SUCCESS` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_CreateCredentialBookResult_into_SUCCESS(
+    result: CreateCredentialBookResult,
+) -> CredentialBook {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Deallocates a credential-book by its handle
+#[no_mangle]
+pub extern "C" fn np_ffi_deallocate_credential_book(
+    credential_book: CredentialBook,
+) -> DeallocateResult {
+    deallocate_credential_book(credential_book)
+}
diff --git a/nearby/presence/np_c_ffi/src/deserialize/mod.rs b/nearby/presence/np_c_ffi/src/deserialize/mod.rs
new file mode 100644
index 0000000..9f2cea8
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/deserialize/mod.rs
@@ -0,0 +1,87 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use crate::{unwrap, PanicReason};
+use np_ffi_core::common::*;
+use np_ffi_core::credentials::credential_book::CredentialBook;
+use np_ffi_core::deserialize::v0::*;
+use np_ffi_core::deserialize::v1::*;
+use np_ffi_core::deserialize::*;
+use np_ffi_core::utils::FfiEnum;
+
+mod v0;
+mod v1;
+
+/// Attempts to deserialize an advertisement with the given service-data
+/// payload (presumed to be under the NP service UUID) using credentials
+/// pulled from the given credential-book.
+#[no_mangle]
+pub extern "C" fn np_ffi_deserialize_advertisement(
+    adv_payload: RawAdvertisementPayload,
+    credential_book: CredentialBook,
+) -> DeserializeAdvertisementResult {
+    deserialize_advertisement(&adv_payload, credential_book)
+}
+
+/// Gets the tag of a `DeserializeAdvertisementResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializeAdvertisementResult_kind(
+    result: DeserializeAdvertisementResult,
+) -> DeserializeAdvertisementResultKind {
+    result.kind()
+}
+
+/// Casts a `DeserializeAdvertisementResult` to the `V0` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializeAdvertisementResult_into_V0(
+    result: DeserializeAdvertisementResult,
+) -> DeserializedV0Advertisement {
+    unwrap(result.into_v0(), PanicReason::EnumCastFailed)
+}
+
+/// Casts a `DeserializeAdvertisementResult` to the `V1` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializeAdvertisementResult_into_V1(
+    result: DeserializeAdvertisementResult,
+) -> DeserializedV1Advertisement {
+    unwrap(result.into_v1(), PanicReason::EnumCastFailed)
+}
+
+/// Deallocates any internal data referenced by a `DeserializeAdvertisementResult`. This should only
+/// be used if into_V0 or into_V1, have not been called yet as it shares the same underlying
+/// resource.
+#[no_mangle]
+pub extern "C" fn np_ffi_deallocate_deserialize_advertisement_result(
+    result: DeserializeAdvertisementResult,
+) -> DeallocateResult {
+    result.deallocate()
+}
+
+/// Deallocates any internal data referenced by a `DeserializedV0Advertisement`
+#[no_mangle]
+pub extern "C" fn np_ffi_deallocate_deserialized_V0_advertisement(
+    adv: DeserializedV0Advertisement,
+) -> DeallocateResult {
+    adv.deallocate()
+}
+
+/// Deallocates any internal data referenced by a `DeserializedV1Advertisement`
+#[no_mangle]
+pub extern "C" fn np_ffi_deallocate_deserialized_V1_advertisement(
+    adv: DeserializedV1Advertisement,
+) -> DeallocateResult {
+    adv.deallocate()
+}
diff --git a/nearby/presence/np_c_ffi/src/deserialize/v0.rs b/nearby/presence/np_c_ffi/src/deserialize/v0.rs
new file mode 100644
index 0000000..877cee5
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/deserialize/v0.rs
@@ -0,0 +1,149 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use crate::{panic, unwrap, PanicReason};
+use np_ffi_core::common::DeallocateResult;
+use np_ffi_core::deserialize::v0::v0_payload::V0Payload;
+use np_ffi_core::deserialize::v0::*;
+use np_ffi_core::utils::FfiEnum;
+
+/// Gets the tag of a `DeserializedV0Advertisement` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV0Advertisement_kind(
+    result: DeserializedV0Advertisement,
+) -> DeserializedV0AdvertisementKind {
+    result.kind()
+}
+
+/// Casts a `DeserializedV0Advertisement` to the `Legible` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV0Advertisement_into_LEGIBLE(
+    adv: DeserializedV0Advertisement,
+) -> LegibleDeserializedV0Advertisement {
+    unwrap(adv.into_legible(), PanicReason::EnumCastFailed)
+}
+
+/// Gets the number of DEs in a legible deserialized advertisement.
+/// Suitable as an iteration bound for `V0Payload#get_de`.
+#[no_mangle]
+pub extern "C" fn np_ffi_LegibleDeserializedV0Advertisement_get_num_des(
+    adv: LegibleDeserializedV0Advertisement,
+) -> u8 {
+    adv.num_des()
+}
+
+/// Gets just the data-element payload of a `LegibleDeserializedV0Advertisement`.
+#[no_mangle]
+pub extern "C" fn np_ffi_LegibleDeserializedV0Advertisement_into_payload(
+    adv: LegibleDeserializedV0Advertisement,
+) -> V0Payload {
+    adv.into_payload()
+}
+
+/// Gets just the identity information associated with a `LegibleDeserializedV0Advertisement`.
+#[no_mangle]
+pub extern "C" fn np_ffi_LegibleDeserializedV0Advertisement_into_identity(
+    adv: LegibleDeserializedV0Advertisement,
+) -> DeserializedV0Identity {
+    adv.into_identity()
+}
+
+/// Deallocates any internal data of a `LegibleDeserializedV0Advertisement`
+#[no_mangle]
+pub extern "C" fn np_ffi_deallocate_legible_v0_advertisement(
+    adv: LegibleDeserializedV0Advertisement,
+) -> DeallocateResult {
+    adv.deallocate()
+}
+
+/// Gets the tag of the `DeserializedV0Identity` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV0Identity_kind(
+    identity: DeserializedV0Identity,
+) -> DeserializedV0IdentityKind {
+    identity.kind()
+}
+
+/// Attempts to get the data-element with the given index in the passed v0 adv payload
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Payload_get_de(payload: V0Payload, index: u8) -> GetV0DEResult {
+    payload.get_de(index)
+}
+
+/// Deallocates any internal data of a `V0Payload`
+#[no_mangle]
+pub extern "C" fn np_ffi_deallocate_v0_payload(payload: V0Payload) -> DeallocateResult {
+    payload.deallocate_payload()
+}
+
+/// Gets the tag of a `GetV0DEResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV0DEResult_kind(result: GetV0DEResult) -> GetV0DEResultKind {
+    result.kind()
+}
+
+/// Casts a `GetV0DEResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV0DEResult_into_SUCCESS(result: GetV0DEResult) -> V0DataElement {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Gets the tag of a `V0DataElement` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0DataElement_kind(de: V0DataElement) -> V0DataElementKind {
+    de.kind()
+}
+
+/// Casts a `V0DataElement` to the `TxPower` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0DataElement_into_TX_POWER(de: V0DataElement) -> TxPower {
+    unwrap(de.into_tx_power(), PanicReason::EnumCastFailed)
+}
+
+/// Casts a `V0DataElement` to the `Actions` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0DataElement_into_ACTIONS(de: V0DataElement) -> V0Actions {
+    unwrap(de.into_actions(), PanicReason::EnumCastFailed)
+}
+
+/// Return whether a boolean action type is set in this data element
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Actions_has_action(
+    actions: V0Actions,
+    action_type: BooleanActionType,
+) -> bool {
+    match actions.has_action(&action_type) {
+        Ok(b) => b,
+        Err(_) => panic(PanicReason::InvalidActionBits),
+    }
+}
+
+/// Gets the 4 bit context sync sequence number as a u8 from this data element
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Actions_get_context_sync_sequence_number(actions: V0Actions) -> u8 {
+    match actions.get_context_sync_seq_num() {
+        Ok(b) => b,
+        Err(_) => panic(PanicReason::InvalidActionBits),
+    }
+}
+
+/// Return whether a boolean action type is set in this data element
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Actions_as_u32(actions: V0Actions) -> u32 {
+    actions.as_u32()
+}
diff --git a/nearby/presence/np_c_ffi/src/deserialize/v1.rs b/nearby/presence/np_c_ffi/src/deserialize/v1.rs
new file mode 100644
index 0000000..dc682a3
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/deserialize/v1.rs
@@ -0,0 +1,114 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use crate::{unwrap, PanicReason};
+use np_ffi_core::deserialize::v1::*;
+use np_ffi_core::utils::FfiEnum;
+
+/// Gets the number of legible sections on a deserialized V1 advertisement.
+/// Suitable as an index bound for the second argument of
+/// `np_ffi_DeserializedV1Advertisement#get_section`.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Advertisement_get_num_legible_sections(
+    adv: DeserializedV1Advertisement,
+) -> u8 {
+    adv.num_legible_sections()
+}
+
+/// Gets the number of sections on a deserialized V1 advertisement which
+/// were unable to be decrypted with the credentials that the receiver possesses.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Advertisement_get_num_undecryptable_sections(
+    adv: DeserializedV1Advertisement,
+) -> u8 {
+    adv.num_undecryptable_sections()
+}
+
+/// Gets the legible section with the given index in a deserialized V1 advertisement.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Advertisement_get_section(
+    adv: DeserializedV1Advertisement,
+    legible_section_index: u8,
+) -> GetV1SectionResult {
+    adv.get_section(legible_section_index)
+}
+
+/// Gets the tag of the `GetV1SectionResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV1SectionResult_kind(
+    result: GetV1SectionResult,
+) -> GetV1SectionResultKind {
+    result.kind()
+}
+
+/// Casts a `GetV1SectionResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV1SectionResult_into_SUCCESS(
+    result: GetV1SectionResult,
+) -> DeserializedV1Section {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Gets the number of data elements in a deserialized v1 section.
+/// Suitable as an iteration bound for the second argument of
+/// `np_ffi_DeserializedV1Section_get_de`.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Section_get_num_des(section: DeserializedV1Section) -> u8 {
+    section.num_des()
+}
+
+/// Gets the tag of the identity tagged-union used for the passed section.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Section_get_identity_kind(
+    section: DeserializedV1Section,
+) -> DeserializedV1IdentityKind {
+    section.identity_kind()
+}
+
+/// Gets the data-element with the given index in the passed section.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Section_get_de(
+    section: DeserializedV1Section,
+    de_index: u8,
+) -> GetV1DEResult {
+    section.get_de(de_index)
+}
+
+/// Gets the tag of the `GetV1DEResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV1DEResult_kind(result: GetV1DEResult) -> GetV1DEResultKind {
+    result.kind()
+}
+
+/// Casts a `GetV1DEResult` to the `Success` vartiant, panicking in the
+/// case where the passed value is of a different enum variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV1DEResult_into_SUCCESS(result: GetV1DEResult) -> V1DataElement {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Converts a `V1DataElement` to a `GenericV1DataElement` which
+/// only maintains information about the DE's type-code and payload.
+#[no_mangle]
+pub extern "C" fn np_ffi_V1DataElement_to_generic(de: V1DataElement) -> GenericV1DataElement {
+    de.to_generic()
+}
+
+/// Extracts the numerical value of the given V1 DE type code as
+/// an unsigned 32-bit integer.
+#[no_mangle]
+pub extern "C" fn np_ffi_V1DEType_to_uint32_t(de_type: V1DEType) -> u32 {
+    de_type.to_u32()
+}
diff --git a/nearby/presence/np_c_ffi/src/lib.rs b/nearby/presence/np_c_ffi/src/lib.rs
new file mode 100644
index 0000000..bd475ab
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/lib.rs
@@ -0,0 +1,221 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! NP Rust C FFI
+
+#![cfg_attr(not(test), no_std)]
+#![allow(dead_code)]
+extern crate alloc;
+extern crate core;
+
+pub mod credentials;
+pub mod deserialize;
+
+/// Structure for categorized reasons for why a NP C FFI call may
+/// be panicking.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum PanicReason {
+    /// Some enum cast to a variant failed. Utilized
+    /// for failed enum casts of all enums.
+    ///
+    /// (That is, this is the catch-all panic reason for enum
+    /// casts where there is not a more specific reason
+    /// in some other variant of this enum.)
+    EnumCastFailed = 0,
+    /// The panic handler is used to assert conditions are true to avoid programmer errors.
+    /// If a failed assert condition is hit, this panic handler is invoked with this reason.
+    AssertFailed = 1,
+    /// Error returned if action bits inside of a V0Actions struct are invalid. If the struct was
+    /// created by this deserializer, the bits will always be valid, they are only invalid if
+    /// a user reaches in and changes them to something invalid.
+    InvalidActionBits = 2,
+}
+
+/// Structure which maintains information about the panic-handler
+/// for panicking calls in the NP C FFI.
+#[derive(Debug)]
+struct PanicHandler {
+    /// Optional function-pointer to client-specified panic behavior.
+    handler: Option<unsafe extern "C" fn(PanicReason) -> ()>,
+
+    /// Fuse to prevent setting the panic-handler more than once.
+    /// We do not use the presence/absence of `self.handler` for this,
+    /// since it's possible for the client to explicitly pass "NULL"
+    /// to set the panic-handler to the platform-default (and ensure
+    /// that the panic-handler never changes from the platform-default.)
+    handler_set_by_client: bool,
+}
+
+impl PanicHandler {
+    pub(crate) const fn new() -> Self {
+        Self { handler: None, handler_set_by_client: false }
+    }
+    pub(crate) fn set_handler(
+        &mut self,
+        handler: Option<unsafe extern "C" fn(PanicReason) -> ()>,
+    ) -> bool {
+        // Only allow setting the panic handler once
+        if !self.handler_set_by_client {
+            self.handler = handler;
+            self.handler_set_by_client = true;
+            true
+        } else {
+            false
+        }
+    }
+    pub(crate) fn panic(&self, panic_reason: PanicReason) -> ! {
+        if let Some(handler) = self.handler {
+            unsafe { handler(panic_reason) }
+        }
+        Self::system_handler(panic_reason)
+    }
+    #[cfg(feature = "std")]
+    fn system_handler(panic_reason: PanicReason) -> ! {
+        eprintln!("NP FFI Panicked: {:?}", panic_reason);
+        let backtrace = std::backtrace::Backtrace::capture();
+        eprintln!("Stack trace: {}", backtrace);
+        std::process::abort!();
+    }
+    #[cfg(not(feature = "std"))]
+    #[allow(clippy::empty_loop)]
+    fn system_handler(_: PanicReason) -> ! {
+        // Looping is the only platform-independent thing
+        // that we can really do in this scenario.
+        // (Even clippy's explanation for the empty-loop
+        // lint mentions platform-specific intrinsics
+        // as being the only true way to avoid this
+        // in a no_std environment.)
+        loop {}
+    }
+}
+
+static PANIC_HANDLER: spin::RwLock<PanicHandler> = spin::RwLock::new(PanicHandler::new());
+
+pub(crate) fn panic(reason: PanicReason) -> ! {
+    PANIC_HANDLER.read().panic(reason)
+}
+
+pub(crate) fn unwrap<T>(value: Option<T>, panic_reason: PanicReason) -> T {
+    match value {
+        Some(x) => x,
+        None => panic(panic_reason),
+    }
+}
+
+/// Overrides the global panic handler to be used when NP C FFI calls panic.
+/// This method will only have an effect on the global panic-handler
+/// the first time it's called, and this method will return `true`
+/// to indicate that the panic handler was successfully set.
+/// All subsequent calls to this method
+/// will simply ignore the argument and return `false`.
+///
+/// If the passed function pointer is non-null,
+/// then we will call it upon every panic,
+/// followed by the default panicking behavior for
+/// the platform (in the case where the user-specified
+/// function does not terminate or hang the running process.)
+///
+/// Otherwise, we will resort to the
+/// default panicking behavior for the system, which
+/// is a printed stack trace followed by an abort
+/// when this crate is compiled with `std`,
+/// but a bare `loop { }` when this crate is compiled without.
+#[no_mangle]
+pub extern "C" fn np_ffi_global_config_panic_handler(
+    handler: Option<unsafe extern "C" fn(PanicReason) -> ()>,
+) -> bool {
+    let mut panic_handler = PANIC_HANDLER.write();
+    panic_handler.set_handler(handler)
+}
+
+/// Sets an override to the number of shards to employ in the NP FFI's
+/// internal handle-maps, which places an upper bound on the number
+/// of writing threads which may make progress at any one time
+/// when concurrently accessing handles of the same type.
+///
+/// By default, this value will be set to 16, or in `std` environments,
+/// the minimum of 16 and the number of available hardware threads.
+/// A shard value override of zero will be interpreted the same
+/// as this default.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of _any_ non-`np_ffi_global_config_set`
+/// API call.
+#[no_mangle]
+pub extern "C" fn np_ffi_global_config_set_num_shards(num_shards: u8) {
+    np_ffi_core::common::global_config_set_num_shards(num_shards)
+}
+
+/// Sets the maximum number of active handles to credential books
+/// which may be active at any one time.
+/// Default value: Max value.
+/// Max value: `u32::MAX - 1`.
+///
+/// Useful for bounding the maximum memory used by the client application
+/// on credential books in constrained-memory environments.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call utilizing credential books.
+#[no_mangle]
+pub extern "C" fn np_ffi_global_config_set_max_num_credential_books(max_num_credential_books: u32) {
+    np_ffi_core::common::global_config_set_max_num_credential_books(max_num_credential_books)
+}
+
+/// Sets the maximum number of active handles to deserialized v0
+/// advertisements which may be active at any one time.
+///
+/// Useful for bounding the maximum memory used by the client application
+/// on v0 advertisements in constrained-memory environments.
+///
+/// Default value: Max value.
+/// Max value: `u32::MAX - 1`.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call which references or returns a deserialized V0 advertisement.
+#[no_mangle]
+pub extern "C" fn np_ffi_global_config_set_max_num_deserialized_v0_advertisements(
+    max_num_deserialized_v0_advertisements: u32,
+) {
+    np_ffi_core::common::global_config_set_max_num_deserialized_v0_advertisements(
+        max_num_deserialized_v0_advertisements,
+    )
+}
+
+/// Sets the maximum number of active handles to deserialized v1
+/// advertisements which may be active at any one time.
+///
+/// Useful for bounding the maximum memory used by the client application
+/// on v1 advertisements in constrained-memory environments.
+///
+/// Default value: Max value.
+/// Max value: `u32::MAX - 1`.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call which references or returns a deserialized V1 advertisement.
+#[no_mangle]
+pub extern "C" fn np_ffi_global_config_set_max_num_deserialized_v1_advertisements(
+    max_num_deserialized_v1_advertisements: u32,
+) {
+    np_ffi_core::common::global_config_set_max_num_deserialized_v1_advertisements(
+        max_num_deserialized_v1_advertisements,
+    )
+}
diff --git a/nearby/presence/np_cpp_ffi/CMakeLists.txt b/nearby/presence/np_cpp_ffi/CMakeLists.txt
new file mode 100644
index 0000000..27c9132
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/CMakeLists.txt
@@ -0,0 +1,48 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# include ABSL third_party dir which will add it to the cmake build tree
+set(ABSL_PROPAGATE_CXX_STD ON)
+add_subdirectory(${THIRD_PARTY_DIR}/abseil-cpp ${THIRD_PARTY_DIR}/abseil-cpp/build)
+
+add_library(nearby_protocol nearby_protocol.cc)
+
+target_link_libraries(nearby_protocol
+        "${CMAKE_SOURCE_DIR}/np_c_ffi/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}np_c_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        absl::statusor)
+
+target_include_directories(nearby_protocol PUBLIC
+        include/
+        ${CMAKE_SOURCE_DIR}/np_c_ffi/include/cpp/)
+
+target_include_directories(nearby_protocol PRIVATE
+        ${CMAKE_SOURCE_DIR}/np_c_ffi/include/cpp/internal/)
+
+add_subdirectory(sample)
+
+# shared testing utilities between sample, tests, and fuzzers
+add_library(shared_test_util shared/shared_test_util.cc)
+target_include_directories(shared_test_util PUBLIC shared/)
+target_include_directories(shared_test_util PRIVATE include/)
+target_link_libraries(shared_test_util nearby_protocol absl::statusor)
+
+if (ENABLE_TESTS)
+    message(STATUS "Enabling np_cpp tests")
+    add_subdirectory(tests)
+    add_subdirectory(benchmarks)
+endif ()
+
+if (ENABLE_FUZZ)
+    add_subdirectory(fuzz)
+endif ()
diff --git a/nearby/presence/np_cpp_ffi/benchmarks/CMakeLists.txt b/nearby/presence/np_cpp_ffi/benchmarks/CMakeLists.txt
new file mode 100644
index 0000000..c7d8343
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/benchmarks/CMakeLists.txt
@@ -0,0 +1,32 @@
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+add_executable(np_ffi_bench np_ffi_bench.cc)
+
+target_link_libraries(
+        np_ffi_bench
+        nearby_protocol
+        benchmark::benchmark)
+
+if (UNIX)
+    target_link_libraries(
+            np_ffi_bench
+            dl -fsanitize=address
+    )
+elseif (MSVC)
+    target_link_libraries(
+            np_ffi_bench
+            bcrypt ntdll userenv ws2_32
+    )
+endif ()
diff --git a/nearby/presence/np_cpp_ffi/benchmarks/np_ffi_bench.cc b/nearby/presence/np_cpp_ffi/benchmarks/np_ffi_bench.cc
new file mode 100644
index 0000000..72a3f91
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/benchmarks/np_ffi_bench.cc
@@ -0,0 +1,102 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+
+#include "np_cpp_ffi_functions.h"
+#include "np_cpp_ffi_types.h"
+
+#include "benchmark/benchmark.h"
+
+// Internal C struct representation of a v0 payload
+static np_ffi::internal::RawAdvertisementPayload payload{
+    {7,
+     {
+         0x00,             // Adv Header
+         0x03,             // Public DE header
+         0x15, 0x05,       // Tx Power value 5
+         0x26, 0x00, 0x46, // Length 2 Actions
+     }}};
+
+static nearby_protocol::RawAdvertisementPayload
+    v0_adv(nearby_protocol::ByteBuffer(payload.bytes));
+
+class NpCppBenchmark : public benchmark::Fixture {
+  void SetUp(const ::benchmark::State &state) override {}
+
+  void TearDown(const ::benchmark::State &state) override {}
+};
+
+BENCHMARK_DEFINE_F(NpCppBenchmark, V0PlaintextAdvertisement)
+(benchmark::State &state) {
+  auto cred_book = nearby_protocol::CredentialBook::TryCreate();
+  assert(cred_book.ok());
+  auto num_ciphers = state.range(0);
+
+  for ([[maybe_unused]] auto _ : state) {
+    for (int i = 0; i < num_ciphers; i++) {
+      auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+          v0_adv, cred_book.value());
+      assert(result.GetKind() ==
+             nearby_protocol::DeserializeAdvertisementResultKind::V0);
+    }
+  }
+}
+
+BENCHMARK_REGISTER_F(NpCppBenchmark, V0PlaintextAdvertisement)
+    ->RangeMultiplier(10)
+    ->Range(1, 1000)
+    ->Unit(benchmark::kMicrosecond);
+
+class NpCBenchmark : public benchmark::Fixture {
+  void SetUp(const ::benchmark::State &state) override {}
+
+  void TearDown(const ::benchmark::State &state) override {}
+};
+
+BENCHMARK_DEFINE_F(NpCBenchmark, V0PlaintextAdvertisement)
+(benchmark::State &state) {
+  auto num_ciphers = state.range(0);
+  auto book_result = np_ffi::internal::np_ffi_create_credential_book();
+  assert(
+      np_ffi::internal::np_ffi_CreateCredentialBookResult_kind(book_result) ==
+      np_ffi::internal::CreateCredentialBookResultKind::Success);
+  auto book = np_ffi::internal::np_ffi_CreateCredentialBookResult_into_SUCCESS(
+      book_result);
+
+  for ([[maybe_unused]] auto _ : state) {
+    for (int i = 0; i < num_ciphers; i++) {
+      auto result =
+          np_ffi::internal::np_ffi_deserialize_advertisement({payload}, book);
+      assert(np_ffi::internal::np_ffi_DeserializeAdvertisementResult_kind(
+                 result) ==
+             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+      auto deallocate_result =
+          np_ffi::internal::np_ffi_deallocate_deserialize_advertisement_result(
+              result);
+      assert(deallocate_result == np_ffi::internal::DeallocateResult::Success);
+    }
+  }
+
+  auto deallocate_result =
+      np_ffi::internal::np_ffi_deallocate_credential_book(book);
+  assert(deallocate_result == np_ffi::internal::DeallocateResult::Success);
+}
+
+BENCHMARK_REGISTER_F(NpCBenchmark, V0PlaintextAdvertisement)
+    ->RangeMultiplier(10)
+    ->Range(1, 1000)
+    ->Unit(benchmark::kMicrosecond);
+
+BENCHMARK_MAIN();
\ No newline at end of file
diff --git a/nearby/presence/np_cpp_ffi/fuzz/CMakeLists.txt b/nearby/presence/np_cpp_ffi/fuzz/CMakeLists.txt
new file mode 100644
index 0000000..17f2f1f
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/fuzz/CMakeLists.txt
@@ -0,0 +1,31 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 3.0)
+
+# libfuzzer needs clang
+SET(CMAKE_C_COMPILER "clang")
+
+add_compile_definitions("CORPUS_DIR=${CMAKE_CURRENT_SOURCE_DIR}/corpus")
+file(COPY corpus DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")
+add_executable(generate_fuzz_corpus generate_fuzz_corpus.cc)
+target_link_libraries(generate_fuzz_corpus nearby_protocol shared_test_util)
+
+add_executable(fuzzer_np_cpp_deserialize fuzzer_np_cpp_deserialize.cc)
+target_compile_options(fuzzer_np_cpp_deserialize PRIVATE -fsanitize=fuzzer,address)
+target_link_libraries(fuzzer_np_cpp_deserialize nearby_protocol -fsanitize=fuzzer,address)
+
+add_executable(fuzzer_np_cpp_valid_header fuzzer_np_cpp_valid_header.cc)
+target_compile_options(fuzzer_np_cpp_valid_header PRIVATE -fsanitize=fuzzer,address)
+target_link_libraries(fuzzer_np_cpp_valid_header nearby_protocol -fsanitize=fuzzer,address)
diff --git a/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvEmpty b/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvEmpty
new file mode 100644
index 0000000..f76dd23
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvEmpty
Binary files differ
diff --git a/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvSimple b/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvSimple
new file mode 100644
index 0000000..fac97f6
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvSimple
Binary files differ
diff --git a/nearby/presence/np_cpp_ffi/fuzz/corpus/V1AdvSimple b/nearby/presence/np_cpp_ffi/fuzz/corpus/V1AdvSimple
new file mode 100644
index 0000000..4acdf33
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/fuzz/corpus/V1AdvSimple
@@ -0,0 +1 @@
+ 
\ No newline at end of file
diff --git a/nearby/presence/np_cpp_ffi/fuzz/fuzzer_np_cpp_deserialize.cc b/nearby/presence/np_cpp_ffi/fuzz/fuzzer_np_cpp_deserialize.cc
new file mode 100644
index 0000000..84d7247
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/fuzz/fuzzer_np_cpp_deserialize.cc
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "nearby_protocol.h"
+
+#include <cstdint>
+#include <string>
+
+#include "absl/strings/escaping.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  // won't fit into a FfiByteBuffer<255>
+  if (size > 255) {
+    return -1;
+  }
+
+  nearby_protocol::FfiByteBuffer<255> raw_bytes;
+  memcpy(&raw_bytes.bytes, data, size);
+  raw_bytes.len = size;
+
+  nearby_protocol::RawAdvertisementPayload payload(
+      (nearby_protocol::ByteBuffer<255>(raw_bytes)));
+
+  auto credential_book = nearby_protocol::CredentialBook::TryCreate();
+  if (!credential_book.ok()) {
+    printf("Error: create Credential book failed\n");
+    __builtin_trap();
+  }
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          payload, credential_book.value());
+
+  return 0;
+}
\ No newline at end of file
diff --git a/nearby/presence/np_cpp_ffi/fuzz/fuzzer_np_cpp_valid_header.cc b/nearby/presence/np_cpp_ffi/fuzz/fuzzer_np_cpp_valid_header.cc
new file mode 100644
index 0000000..c08b6cd
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/fuzz/fuzzer_np_cpp_valid_header.cc
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "nearby_protocol.h"
+
+#include <cstdint>
+
+// Fuzz input data beginning with a valid header
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  // Won't fit into a FfiByteBuffer<255>
+  if (size > 255) {
+    return -1;
+  }
+
+  nearby_protocol::FfiByteBuffer<255> raw_bytes;
+  memcpy(&raw_bytes.bytes, data, size);
+  raw_bytes.len = size;
+
+  nearby_protocol::RawAdvertisementPayload payload(
+      (nearby_protocol::ByteBuffer<255>(raw_bytes)));
+
+  auto credential_book = nearby_protocol::CredentialBook::TryCreate();
+  if (!credential_book.ok()) {
+    printf("Error: create Credential book failed\n");
+    __builtin_trap();
+  }
+
+  // Force it to go down the v0 deserialization path
+  raw_bytes.bytes[0] = 0x00;
+
+  auto v0_result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      payload, credential_book.value());
+
+  // Force it down the v1 deserialization path
+  raw_bytes.bytes[0] = 0x20;
+
+  auto v1_result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      payload, credential_book.value());
+
+  return 0;
+}
\ No newline at end of file
diff --git a/nearby/presence/np_cpp_ffi/fuzz/generate_fuzz_corpus.cc b/nearby/presence/np_cpp_ffi/fuzz/generate_fuzz_corpus.cc
new file mode 100644
index 0000000..9d28f7a
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/fuzz/generate_fuzz_corpus.cc
@@ -0,0 +1,44 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+#include "shared_test_util.h"
+
+#include <fstream>
+#include <iostream>
+
+#define STRING(x) #x
+#define XSTRING(x) STRING(x)
+
+void write_corpus_data_file(std::string file_name,
+                            nearby_protocol::RawAdvertisementPayload payload) {
+  // Get the current source directory.
+  std::string current_source_dir = XSTRING(CORPUS_DIR);
+
+  // Print the current source directory to the console.
+  std::cout << "Writing to file: " << current_source_dir << "/" << file_name
+            << std::endl;
+
+  std::ofstream out(current_source_dir + "/" + file_name,
+                    std::ios::out | std::ios::binary);
+  auto vec_data = payload.buffer_.ToVector();
+  out.write(reinterpret_cast<const char *>(vec_data.data()), vec_data.size());
+  out.close();
+}
+
+int main() {
+  write_corpus_data_file("V0AdvSimple", V0AdvSimple);
+  write_corpus_data_file("V1AdvSimple", V1AdvSimple);
+  write_corpus_data_file("V0AdvEmpty", V0AdvEmpty);
+}
diff --git a/nearby/presence/np_cpp_ffi/include/nearby_protocol.h b/nearby/presence/np_cpp_ffi/include/nearby_protocol.h
new file mode 100644
index 0000000..e7e46e7
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/include/nearby_protocol.h
@@ -0,0 +1,518 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef NEARBY_PRESENCE_NP_CPP_FFI_INCLUDE_NP_PROTOCOL_H_
+#define NEARBY_PRESENCE_NP_CPP_FFI_INCLUDE_NP_PROTOCOL_H_
+
+#include "absl/status/statusor.h"
+#include "absl/strings/str_format.h"
+#include "np_cpp_ffi_types.h"
+
+// This namespace provides a C++ API surface to the Rust nearby protocol
+// implementation. This is a wrapper over the np_ffi::internal namespace defined
+// in the headers np_cpp_ffi_functions.h and np_cpp_ffi_types.h which are
+// autogenerated by cbindgen based on the rust crate np_c_ffi.
+//
+// Classes in this namespace which have explicitly deleted copy-assignment and
+// copy-constructor functions are backed by a C handle allocated in the
+// underlying rust library. These handles are managed by the C++ classes which
+// hold them and will be freed automatically when the corresponding  type which
+// currently owns the handle goes out of scope.
+//
+// A note on conventions in this API surface:
+//
+// Function prefixed with `Into` will transfer ownership of the current instance
+// into a the newly returned object type, meaning that the previous instance is
+// no longer valid. Attempting to use a type which has already been moved out of
+// will result in the panic handler being invoked, which by default triggers
+// std::abort();
+//
+// Functions prefixed with `As` will not transfer ownership and instead return a
+// casted version of the previous object.
+//
+// Functions prefixed with `Try` are fallible and will return an
+// absl::StatusOr<T> result that needs to be checked before its used
+//
+// DO NOT DIRECTLY access the types defined in np_ffi::internal::*, these are
+// auto-generated and are easy to mis-use. Instead use the public types exposed
+// via the `nearby_protocol` namespace.
+namespace nearby_protocol {
+
+// Re-exporting cbindgen generated types which are used in the public API
+using np_ffi::internal::BooleanActionType;
+using np_ffi::internal::CreateCredentialBookResultKind;
+using np_ffi::internal::DeserializeAdvertisementResultKind;
+using np_ffi::internal::DeserializedV0AdvertisementKind;
+using np_ffi::internal::DeserializedV0IdentityKind;
+using np_ffi::internal::DeserializedV1IdentityKind;
+using np_ffi::internal::GetV0DEResultKind;
+using np_ffi::internal::PanicReason;
+using np_ffi::internal::TxPower;
+using np_ffi::internal::V0DataElementKind;
+
+template <uintptr_t N> using FfiByteBuffer = np_ffi::internal::ByteBuffer<N>;
+
+// All of the types defined in this header
+class RawAdvertisementPayload;
+class CredentialBook;
+class Deserializer;
+class DeserializeAdvertisementResult;
+
+// V0 Classes
+class DeserializedV0Advertisement;
+class DeserializedV0Identity;
+class LegibleDeserializedV0Advertisement;
+class V0DataElement;
+class V0Payload;
+class V0Actions;
+
+// V1 Classes
+class DeserializedV1Advertisement;
+class DeserializedV1Section;
+class V1DataElement;
+
+// Global static singleton class used to customize the deserialization library.
+// If no values are set, then the default values will be used. In most cases the
+// default max instance values won't need to be changed unless you are running
+// in a constrained resources environment, and need to specify an upper limit
+// on memory consumption. See np_ffi_global_config_* functions in
+// np_cpp_ffi_functions.h for more info
+class GlobalConfig {
+public:
+  // This class provides the static methods needed for global configuration,
+  // so it does not need to be constructable, cloneable, or assignable.
+  GlobalConfig(GlobalConfig const &) = delete;
+  void operator=(GlobalConfig const &) = delete;
+  GlobalConfig() = delete;
+
+  // Provides a user specified panic handler. This method will only have an
+  // effect on the global panic-handler the first time it's called, and this
+  // method will return `true` to indicate that the panic handler was
+  // successfully set. All subsequent calls to this method will simply ignore
+  // the argument and return `false`. see np_ffi_global_config_panic_handler in
+  // np_cpp_ffi_functions.h for more info
+  [[nodiscard]] static bool SetPanicHandler(void (*handler)(PanicReason));
+
+  // Sets an override to the number of shards employed in the libraries internal
+  // handle maps, used to set an upper limit on memory consumption, see
+  // np_ffi_global_config_set_num_shards in np_cpp_ffi_functions.h for more info
+  static void SetNumShards(uint8_t num_shards);
+
+  // Sets the maximum number of active handles to credential books which may be
+  // active at any one time. See
+  // np_ffi_global_config_set_max_num_credential_books in np_cpp_ffi_functions.h
+  // for more info
+  static void SetMaxNumCredentialBooks(uint32_t max_num_credential_books);
+
+  // Sets the maximum number of active handles to deserialized v0 advertisements
+  // which may be active at any one time. See
+  // np_ffi_global_config_set_max_num_deserialized_v0_advertisements for more
+  // info.
+  static void SetMaxNumDeserializedV0Advertisements(
+      uint32_t max_num_deserialized_v0_advertisements);
+
+  // Sets the maximum number of active handles to deserialized v1 advertisements
+  // which may be active at any one time
+  static void SetMaxNumDeserializedV1Advertisements(
+      uint32_t max_num_deserialized_v1_advertisements);
+};
+
+// Holds the credentials used when decrypting data of an advertisement.
+// This needs to be passed to Deserializer::DeserializeAdvertisement() when
+// attempting to deserialize a payload
+class CredentialBook {
+public:
+  // Don't allow copy constructor or copy assignment, since that would result in
+  // the underlying handle being freed multiple times
+  CredentialBook(const CredentialBook &other) = delete;
+  CredentialBook &operator=(const CredentialBook &other) = delete;
+
+  // Move constructor and move assignment are needed in order to wrap this class
+  // in absl::StatusOr
+  CredentialBook(CredentialBook &&other) noexcept;
+  CredentialBook &operator=(CredentialBook &&other) noexcept;
+
+  // The destructor for a CredentialBook, this will be called when a
+  // CredentialBook instance goes out of scope and will free the underlying
+  // resources
+  ~CredentialBook();
+
+  // Creates a new instance of a CredentialBook, returns the CredentialBook on
+  // success or a Status code on failure
+  [[nodiscard]] static absl::StatusOr<CredentialBook> TryCreate();
+
+private:
+  friend class Deserializer;
+  explicit CredentialBook(np_ffi::internal::CredentialBook credential_book)
+      : credential_book_(credential_book), moved_(false) {}
+
+  np_ffi::internal::CredentialBook credential_book_;
+  bool moved_;
+};
+
+// Representation of a buffer of bytes returned from deserialization APIs
+template <size_t N> class ByteBuffer {
+public:
+  // Constructor for a fixed length buffer of bytes from its internal struct
+  // data representation consisting of a length and array of unint8_t bytes.
+  [[nodiscard]] explicit ByteBuffer(FfiByteBuffer<N> internal)
+      : internal_(internal) {}
+
+  // Creates a ByteBuffer from a absl::string_view of bytes, returning an
+  // absl::OutOfRangeError in the case where bytes is too large to fit into the
+  // buffer. On success the returned type contains a copy of the provided bytes.
+  [[nodiscard]] static absl::StatusOr<ByteBuffer<N>>
+  CopyFrom(absl::string_view bytes) {
+    if (bytes.length() > N) {
+      return absl::OutOfRangeError(
+          absl::StrFormat("Provided bytes of length %d will not fit into a "
+                          "ByteBuffer<N> of size N=%d",
+                          bytes.length(), N));
+    }
+    np_ffi::internal::ByteBuffer<N> internal =
+        np_ffi::internal::ByteBuffer<N>();
+    internal.len = bytes.length();
+    std::copy(std::begin(bytes), std::end(bytes), internal.bytes);
+    return ByteBuffer(internal);
+  }
+
+  // Helper method to convert the ByteBuffer into a vector. The vector will
+  // contain a copy of the bytes and won't share the underlying buffer.
+  [[nodiscard]] std::vector<uint8_t> ToVector() {
+    std::vector<uint8_t> result(internal_.bytes,
+                                internal_.bytes + internal_.len);
+    return result;
+  }
+
+  // Helper method to convert the ByteBuffer into a std::string. The returned
+  // string will contain a copy of the bytes and won't share the underlying
+  // buffer.
+  [[nodiscard]] std::string ToString() {
+    std::string result;
+    result.assign(internal_.bytes, internal_.bytes + internal_.len);
+    return result;
+  }
+
+private:
+  friend class V1DataElement;
+  friend class Deserializer;
+  np_ffi::internal::ByteBuffer<N> internal_;
+};
+
+class RawAdvertisementPayload {
+public:
+  // Creates a RawAdvertisementPayload from a ByteBuffer.
+  explicit RawAdvertisementPayload(ByteBuffer<255> bytes) : buffer_(bytes) {}
+
+  ByteBuffer<255> buffer_;
+
+private:
+  friend class Deserializer;
+};
+
+// A global static Deserializer, configured by GlobalConfig and used to
+// deserialize advertisement payloads
+class Deserializer {
+public:
+  // Attempts to deserialize an advertisement with the given service-data
+  // payload (presumed to be under the NP service UUID) using credentials pulled
+  // from the given credential-book. See np_ffi_deserialize_advertisement in
+  // np_cpp_ffi_functions.h for more info
+  [[nodiscard]] static DeserializeAdvertisementResult
+  DeserializeAdvertisement(RawAdvertisementPayload &payload,
+                           const CredentialBook &credential_book);
+};
+
+// The result type returned from Deserializer::DeserializeAdvertisement(). Can
+// be used to further process the advertisement and inspect its contents
+class DeserializeAdvertisementResult {
+public:
+  // Don't allow copy constructor or copy assignment, since that would result in
+  // the underlying handle being freed multiple times
+  DeserializeAdvertisementResult(const DeserializeAdvertisementResult &other) =
+      delete;
+  DeserializeAdvertisementResult &
+  operator=(const DeserializeAdvertisementResult &other) = delete;
+
+  // Move constructor and move assignment operators
+  DeserializeAdvertisementResult(
+      DeserializeAdvertisementResult &&other) noexcept;
+  DeserializeAdvertisementResult &
+  operator=(DeserializeAdvertisementResult &&other) noexcept;
+
+  // Frees the underlying resources of the result.
+  ~DeserializeAdvertisementResult();
+
+  // Returns the DeserializeAdvertisementResultKind of the Result
+  [[nodiscard]] DeserializeAdvertisementResultKind GetKind();
+
+  // Casts a `DeserializeAdvertisementResult` to the `V0` variant, panicking in
+  // the case where the passed value is of a different enum variant. This can
+  // only be called once. When called, this object is moved into the
+  // returned 'DeserializedV0Advertisement' and this object is no longer valid.
+  [[nodiscard]] DeserializedV0Advertisement IntoV0();
+
+  // Casts a `DeserializeAdvertisementResult` to the `V1` variant, panicking in
+  // the case where the passed value is of a different enum variant. This can
+  // only be called once. After this is cast into a `V1` variant this result
+  // is no longer valid.
+  [[nodiscard]] DeserializedV1Advertisement IntoV1();
+
+private:
+  friend class Deserializer;
+  explicit DeserializeAdvertisementResult(
+      np_ffi::internal::DeserializeAdvertisementResult result)
+      : result_(result), moved_(false) {}
+
+  np_ffi::internal::DeserializeAdvertisementResult result_;
+  bool moved_;
+};
+
+// A deserialized V0 advertisement payload
+class DeserializedV0Advertisement {
+public:
+  // Don't allow copy constructor or copy assignment, since that would result in
+  // the underlying handle being freed multiple times
+  DeserializedV0Advertisement(const DeserializedV0Advertisement &other) =
+      delete;
+  DeserializedV0Advertisement &
+  operator=(const DeserializedV0Advertisement &other) = delete;
+
+  // Move constructor and move assignment operators
+  DeserializedV0Advertisement(DeserializedV0Advertisement &&other) noexcept;
+  DeserializedV0Advertisement &
+  operator=(DeserializedV0Advertisement &&other) noexcept;
+
+  // The destructor which will be called when a DeserializedV0Advertisement
+  // instance goes out of scope, and will free the underlying resources
+  ~DeserializedV0Advertisement();
+
+  // Returns the DeserializedV0AdvertisementKind of the advertisement
+  [[nodiscard]] DeserializedV0AdvertisementKind GetKind();
+
+  // Casts a `DeserializedV0Advertisement` to the `Legible` variant, panicking
+  // in the case where the passed value is of a different enum variant.
+  // After calling this the object is moved into the returned
+  // `LegibleDeserializedV0Advertisement`, and this object is no longer valid.
+  [[nodiscard]] LegibleDeserializedV0Advertisement IntoLegible();
+
+private:
+  friend class DeserializeAdvertisementResult;
+  explicit DeserializedV0Advertisement(
+      np_ffi::internal::DeserializedV0Advertisement v0_advertisement)
+      : v0_advertisement_(v0_advertisement), moved_(false) {}
+
+  np_ffi::internal::DeserializedV0Advertisement v0_advertisement_;
+  bool moved_;
+};
+
+// A Legible deserialized V0 advertisement, which means the contents of it are
+// either plaintext OR have already been decrypted successfully by a matching
+// credential in the provided CredentialBook
+class LegibleDeserializedV0Advertisement {
+public:
+  // Don't allow copy constructor or copy assignment, since that would result in
+  // the underlying handle being freed multiple times
+  LegibleDeserializedV0Advertisement(
+      const LegibleDeserializedV0Advertisement &other) = delete;
+  LegibleDeserializedV0Advertisement &
+  operator=(const LegibleDeserializedV0Advertisement &other) = delete;
+
+  // Move constructor and move assignment operators
+  LegibleDeserializedV0Advertisement(
+      LegibleDeserializedV0Advertisement &&other) noexcept;
+  LegibleDeserializedV0Advertisement &
+  operator=(LegibleDeserializedV0Advertisement &&other) noexcept;
+
+  // The destructor which will be called when a this instance goes out of scope,
+  // and will free the underlying parent handle.
+  ~LegibleDeserializedV0Advertisement();
+
+  // Returns just the identity information associated with the advertisement
+  [[nodiscard]] DeserializedV0Identity GetIdentity();
+  // Returns the number of data elements in the advertisement
+  [[nodiscard]] uint8_t GetNumberOfDataElements();
+  // Returns just the data-element payload of the advertisement
+  [[nodiscard]] V0Payload IntoPayload();
+
+private:
+  friend class DeserializedV0Advertisement;
+  explicit LegibleDeserializedV0Advertisement(
+      np_ffi::internal::LegibleDeserializedV0Advertisement
+          legible_v0_advertisement)
+      : legible_v0_advertisement_(legible_v0_advertisement), moved_(false) {}
+
+  np_ffi::internal::LegibleDeserializedV0Advertisement
+      legible_v0_advertisement_;
+  bool moved_;
+};
+
+// A V0 identity of an advertisement
+class DeserializedV0Identity {
+public:
+  // Returns the DeserializedV0IdentityKind of the advertisement
+  [[nodiscard]] DeserializedV0IdentityKind GetKind();
+
+private:
+  friend class LegibleDeserializedV0Advertisement;
+  explicit DeserializedV0Identity(
+      np_ffi::internal::DeserializedV0Identity v0_identity)
+      : v0_identity_(v0_identity) {}
+  np_ffi::internal::DeserializedV0Identity v0_identity_;
+};
+
+// A data element payload of a Deserialized V0 Advertisement.
+class V0Payload {
+public:
+  // Don't allow copy constructor or copy assignment, since that would result in
+  // the underlying parent handle being freed multiple times.
+  V0Payload(const V0Payload &other) = delete;
+  V0Payload &operator=(const V0Payload &other) = delete;
+
+  // Move constructor and move assignment operators
+  V0Payload(V0Payload &&other) noexcept;
+  V0Payload &operator=(V0Payload &&other) noexcept;
+
+  // Frees the underlying handle when this goes out of scope
+  ~V0Payload();
+
+  // Tries to retrieve the data element at the given index, returns the data
+  // element if it exists otherwise returns an Error status code
+  [[nodiscard]] absl::StatusOr<V0DataElement> TryGetDataElement(uint8_t index);
+
+private:
+  friend class LegibleDeserializedV0Advertisement;
+  explicit V0Payload(np_ffi::internal::V0Payload v0_payload)
+      : v0_payload_(v0_payload), moved_(false) {}
+
+  np_ffi::internal::V0Payload v0_payload_;
+  bool moved_;
+};
+
+// A single deserialized V0 data element
+class V0DataElement {
+public:
+  // Yields the V0DataElementKind of the data element
+  [[nodiscard]] V0DataElementKind GetKind();
+  // Casts the V0DataElement into the TxPower variant, panicking in the case
+  // where the data element is of a different enum variant
+  [[nodiscard]] TxPower AsTxPower();
+  // Casts the V0DataElement into the Actions variant, panicking in the case
+  // where the data element is of a different enum variant
+  [[nodiscard]] V0Actions AsActions();
+
+private:
+  friend class V0Payload;
+  explicit V0DataElement(np_ffi::internal::V0DataElement v0_data_element)
+      : v0_data_element_(v0_data_element) {}
+  np_ffi::internal::V0DataElement v0_data_element_;
+};
+
+// A V0 Actions Data Element
+class V0Actions {
+public:
+  // Gets the V0 Action bits as represented by a u32 where the last 8 bits are
+  // always 0 since V0 actions can only hold up to 24 bits.
+  [[nodiscard]] uint32_t GetAsU32();
+
+  /// Return whether a boolean action type is present in this data element
+  [[nodiscard]] bool HasAction(BooleanActionType action);
+
+  /// Gets the 4 bit context sync sequence number as a uint8_t from this data
+  /// element
+  [[nodiscard]] uint8_t GetContextSyncSequenceNumber();
+
+private:
+  friend class V0DataElement;
+  explicit V0Actions(np_ffi::internal::V0Actions actions) : actions_(actions) {}
+  np_ffi::internal::V0Actions actions_;
+};
+
+// A deserialized V1 Advertisement payload
+class DeserializedV1Advertisement {
+public:
+  // Don't allow copy constructor or copy assignment, since that would result in
+  // the underlying handle being freed multiple times
+  DeserializedV1Advertisement(const DeserializedV1Advertisement &other) =
+      delete;
+  DeserializedV1Advertisement &
+  operator=(const DeserializedV1Advertisement &other) = delete;
+
+  // Move constructor and move assignment operators
+  DeserializedV1Advertisement(DeserializedV1Advertisement &&other) noexcept;
+  DeserializedV1Advertisement &
+  operator=(DeserializedV1Advertisement &&other) noexcept;
+
+  // Gets the number of legible sections on a deserialized V1 advertisement.
+  // This is usable as an iteration bound for the section_index of TryGetSection
+  [[nodiscard]] uint8_t GetNumLegibleSections();
+  // Gets the number of sections on a deserialized V1 advertisement which
+  // were unable to be decrypted with the credentials that the receiver
+  // possesses
+  [[nodiscard]] uint8_t GetNumUndecryptableSections();
+  // Tries to get the section with the given index in a deserialized V1
+  // advertisement. Returns a error code in the result of an invalid index
+  [[nodiscard]] absl::StatusOr<DeserializedV1Section>
+  TryGetSection(uint8_t section_index);
+
+private:
+  friend class DeserializeAdvertisementResult;
+  explicit DeserializedV1Advertisement(
+      np_ffi::internal::DeserializedV1Advertisement v1_advertisement);
+
+  std::shared_ptr<np_ffi::internal::DeserializedV1Advertisement>
+      v1_advertisement_;
+};
+
+// A Deserialized V1 Section of an advertisement
+class DeserializedV1Section {
+public:
+  // Returns the number of data elements present in the section
+  [[nodiscard]] uint8_t NumberOfDataElements();
+  // Returns the DeserializedV1IdentityKind of the identity
+  [[nodiscard]] DeserializedV1IdentityKind GetIdentityKind();
+  // Tries to get the data element in the section at the given index
+  [[nodiscard]] absl::StatusOr<V1DataElement> TryGetDataElement(uint8_t index);
+
+private:
+  friend class DeserializedV1Advertisement;
+  explicit DeserializedV1Section(
+      np_ffi::internal::DeserializedV1Section section,
+      std::shared_ptr<np_ffi::internal::DeserializedV1Advertisement>
+          owning_v1_advertisement)
+      : section_(section),
+        owning_v1_advertisement_(std::move(owning_v1_advertisement)) {}
+  np_ffi::internal::DeserializedV1Section section_;
+  std::shared_ptr<np_ffi::internal::DeserializedV1Advertisement>
+      owning_v1_advertisement_;
+};
+
+// A V1 Data Element
+class V1DataElement {
+public:
+  // Yields the unsigned 32-bit integer V1 DE type code
+  [[nodiscard]] uint32_t GetDataElementTypeCode() const;
+  // Yields the payload bytes of the data element
+  [[nodiscard]] ByteBuffer<127> GetPayload() const;
+
+private:
+  friend class DeserializedV1Section;
+  explicit V1DataElement(np_ffi::internal::V1DataElement v1_data_element)
+      : v1_data_element_(v1_data_element) {}
+  np_ffi::internal::V1DataElement v1_data_element_;
+};
+
+} //  namespace nearby_protocol
+
+#endif // NEARBY_PRESENCE_NP_CPP_FFI_INCLUDE_NP_PROTOCOL_H_
diff --git a/nearby/presence/np_cpp_ffi/nearby_protocol.cc b/nearby/presence/np_cpp_ffi/nearby_protocol.cc
new file mode 100644
index 0000000..3ee5c63
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/nearby_protocol.cc
@@ -0,0 +1,486 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "include/nearby_protocol.h"
+
+#include "np_cpp_ffi_functions.h"
+
+#ifdef __FILE_NAME__
+#define __ASSERT_FILE_NAME __FILE_NAME__
+#else /* __FILE_NAME__ */
+#define __ASSERT_FILE_NAME __FILE__
+#endif /* __FILE_NAME__ */
+
+namespace nearby_protocol {
+
+static void panic_handler(PanicReason reason);
+
+struct PanicHandler {
+  void (*handler)(PanicReason);
+  bool set_by_client;
+};
+
+static PanicHandler gPanicHandler = PanicHandler{panic_handler, false};
+
+// C++ layer internal panic handler
+static void panic_handler(PanicReason reason) {
+  // Give clients a chance to use their own panic handler, but if they don't
+  // terminate the process we will make sure it happens.
+  if (gPanicHandler.set_by_client) {
+    gPanicHandler.handler(reason);
+  }
+  std::abort();
+}
+
+static void _assert_panic(bool condition, const char *func, const char *file,
+                          int line) {
+  if (!condition) {
+    std::cout << "Assert failed: \n function: " << func << "\n file: " << file
+              << "\n line: " << line << "\n";
+    panic_handler(PanicReason::AssertFailed);
+  }
+}
+
+#define assert_panic(e) _assert_panic(e, __func__, __ASSERT_FILE_NAME, __LINE__)
+
+bool GlobalConfig::SetPanicHandler(void (*handler)(PanicReason)) {
+  if (!gPanicHandler.set_by_client) {
+    gPanicHandler.handler = handler;
+    gPanicHandler.set_by_client = true;
+    return np_ffi::internal::np_ffi_global_config_panic_handler(panic_handler);
+  }
+  return false;
+}
+
+void GlobalConfig::SetNumShards(uint8_t num_shards) {
+  np_ffi::internal::np_ffi_global_config_set_num_shards(num_shards);
+}
+
+void GlobalConfig::SetMaxNumCredentialBooks(uint32_t max_num_credential_books) {
+  np_ffi::internal::np_ffi_global_config_set_max_num_credential_books(
+      max_num_credential_books);
+}
+
+void GlobalConfig::SetMaxNumDeserializedV0Advertisements(
+    uint32_t max_num_deserialized_v0_advertisements) {
+  np_ffi::internal::
+      np_ffi_global_config_set_max_num_deserialized_v0_advertisements(
+          max_num_deserialized_v0_advertisements);
+}
+
+void GlobalConfig::SetMaxNumDeserializedV1Advertisements(
+    uint32_t max_num_deserialized_v1_advertisements) {
+  np_ffi::internal::
+      np_ffi_global_config_set_max_num_deserialized_v1_advertisements(
+          max_num_deserialized_v1_advertisements);
+}
+
+absl::StatusOr<CredentialBook> CredentialBook::TryCreate() {
+  auto result = np_ffi::internal::np_ffi_create_credential_book();
+  auto kind = np_ffi::internal::np_ffi_CreateCredentialBookResult_kind(result);
+
+  switch (kind) {
+  case CreateCredentialBookResultKind::Success: {
+    auto book = CredentialBook(
+        np_ffi::internal::np_ffi_CreateCredentialBookResult_into_SUCCESS(
+            result));
+    return book;
+  }
+  case CreateCredentialBookResultKind::NoSpaceLeft: {
+    return absl::ResourceExhaustedError(
+        "No space left to create credential book");
+  }
+  }
+}
+
+CredentialBook::~CredentialBook() {
+  if (!this->moved_) {
+    auto result =
+        np_ffi::internal::np_ffi_deallocate_credential_book(credential_book_);
+    assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+  }
+}
+
+CredentialBook::CredentialBook(CredentialBook &&other) noexcept
+    : credential_book_(other.credential_book_), moved_(other.moved_) {
+  other.credential_book_ = {};
+  other.moved_ = true;
+}
+
+CredentialBook &CredentialBook::operator=(CredentialBook &&other) noexcept {
+  if (this != &other) {
+    if (!this->moved_) {
+      auto result = np_ffi::internal::np_ffi_deallocate_credential_book(
+          this->credential_book_);
+      assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+    }
+
+    this->credential_book_ = other.credential_book_;
+    this->moved_ = other.moved_;
+
+    other.credential_book_ = {};
+    other.moved_ = true;
+  }
+  return *this;
+}
+
+DeserializeAdvertisementResult
+Deserializer::DeserializeAdvertisement(RawAdvertisementPayload &payload,
+                                       const CredentialBook &credential_book) {
+  assert_panic(!credential_book.moved_);
+  auto result = np_ffi::internal::np_ffi_deserialize_advertisement(
+      {payload.buffer_.internal_}, credential_book.credential_book_);
+  return DeserializeAdvertisementResult(result);
+}
+
+DeserializeAdvertisementResultKind DeserializeAdvertisementResult::GetKind() {
+  assert_panic(!this->moved_);
+  return np_ffi::internal::np_ffi_DeserializeAdvertisementResult_kind(result_);
+}
+
+DeserializedV0Advertisement DeserializeAdvertisementResult::IntoV0() {
+  assert_panic(!this->moved_);
+  auto result =
+      np_ffi::internal::np_ffi_DeserializeAdvertisementResult_into_V0(result_);
+  this->moved_ = true;
+  return DeserializedV0Advertisement(result);
+}
+
+DeserializedV1Advertisement DeserializeAdvertisementResult::IntoV1() {
+  assert_panic(!this->moved_);
+  auto v1_adv =
+      np_ffi::internal::np_ffi_DeserializeAdvertisementResult_into_V1(result_);
+  this->moved_ = true;
+  return DeserializedV1Advertisement(v1_adv);
+}
+
+DeserializeAdvertisementResult::~DeserializeAdvertisementResult() {
+  if (!this->moved_) {
+    auto result =
+        np_ffi::internal::np_ffi_deallocate_deserialize_advertisement_result(
+            result_);
+    assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+  }
+}
+
+DeserializeAdvertisementResult::DeserializeAdvertisementResult(
+    DeserializeAdvertisementResult &&other) noexcept
+    : result_(other.result_), moved_(other.moved_) {
+  other.result_ = {};
+  other.moved_ = true;
+}
+
+DeserializeAdvertisementResult &DeserializeAdvertisementResult::operator=(
+    DeserializeAdvertisementResult &&other) noexcept {
+  if (this != &other) {
+    if (!this->moved_) {
+      auto result =
+          np_ffi::internal::np_ffi_deallocate_deserialize_advertisement_result(
+              result_);
+      assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+    }
+    this->result_ = other.result_;
+    this->moved_ = other.moved_;
+
+    other.result_ = {};
+    other.moved_ = true;
+  }
+  return *this;
+}
+
+// V0 Stuff
+DeserializedV0Advertisement::DeserializedV0Advertisement(
+    DeserializedV0Advertisement &&other) noexcept
+    : v0_advertisement_(other.v0_advertisement_), moved_(other.moved_) {
+  other.v0_advertisement_ = {};
+  other.moved_ = true;
+}
+
+DeserializedV0Advertisement &DeserializedV0Advertisement::operator=(
+    DeserializedV0Advertisement &&other) noexcept {
+  if (this != &other) {
+    if (!this->moved_) {
+      auto result =
+          np_ffi::internal::np_ffi_deallocate_deserialized_V0_advertisement(
+              v0_advertisement_);
+      assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+    }
+    this->v0_advertisement_ = other.v0_advertisement_;
+    this->moved_ = other.moved_;
+
+    other.v0_advertisement_ = {};
+    other.moved_ = true;
+  }
+  return *this;
+}
+
+DeserializedV0Advertisement::~DeserializedV0Advertisement() {
+  if (!this->moved_) {
+    auto result =
+        np_ffi::internal::np_ffi_deallocate_deserialized_V0_advertisement(
+            v0_advertisement_);
+    assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+  }
+}
+
+np_ffi::internal::DeserializedV0AdvertisementKind
+DeserializedV0Advertisement::GetKind() {
+  assert_panic(!this->moved_);
+  return np_ffi::internal::np_ffi_DeserializedV0Advertisement_kind(
+      v0_advertisement_);
+}
+
+LegibleDeserializedV0Advertisement DeserializedV0Advertisement::IntoLegible() {
+  assert_panic(!this->moved_);
+  auto result =
+      np_ffi::internal::np_ffi_DeserializedV0Advertisement_into_LEGIBLE(
+          v0_advertisement_);
+  this->moved_ = true;
+  this->v0_advertisement_ = {};
+  return LegibleDeserializedV0Advertisement(result);
+}
+
+LegibleDeserializedV0Advertisement::LegibleDeserializedV0Advertisement(
+    LegibleDeserializedV0Advertisement &&other) noexcept
+    : legible_v0_advertisement_(other.legible_v0_advertisement_),
+      moved_(other.moved_) {
+  other.moved_ = true;
+  other.legible_v0_advertisement_ = {};
+}
+
+LegibleDeserializedV0Advertisement &
+LegibleDeserializedV0Advertisement::operator=(
+    LegibleDeserializedV0Advertisement &&other) noexcept {
+  if (this != &other) {
+    if (!this->moved_) {
+      auto result =
+          np_ffi::internal::np_ffi_deallocate_legible_v0_advertisement(
+              this->legible_v0_advertisement_);
+      assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+    }
+    this->legible_v0_advertisement_ = other.legible_v0_advertisement_;
+    this->moved_ = other.moved_;
+
+    other.moved_ = true;
+    other.legible_v0_advertisement_ = {};
+  }
+  return *this;
+}
+
+LegibleDeserializedV0Advertisement::~LegibleDeserializedV0Advertisement() {
+  if (!this->moved_) {
+    auto result = np_ffi::internal::np_ffi_deallocate_legible_v0_advertisement(
+        this->legible_v0_advertisement_);
+    assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+  }
+}
+
+DeserializedV0Identity LegibleDeserializedV0Advertisement::GetIdentity() {
+  assert_panic(!this->moved_);
+  auto result =
+      np_ffi::internal::np_ffi_LegibleDeserializedV0Advertisement_into_identity(
+          legible_v0_advertisement_);
+  return DeserializedV0Identity(result);
+}
+
+uint8_t LegibleDeserializedV0Advertisement::GetNumberOfDataElements() {
+  assert_panic(!this->moved_);
+  return np_ffi::internal::
+      np_ffi_LegibleDeserializedV0Advertisement_get_num_des(
+          legible_v0_advertisement_);
+}
+
+V0Payload LegibleDeserializedV0Advertisement::IntoPayload() {
+  assert_panic(!this->moved_);
+  auto result = np_ffi_LegibleDeserializedV0Advertisement_into_payload(
+      legible_v0_advertisement_);
+  this->moved_ = true;
+  return V0Payload(result);
+}
+
+np_ffi::internal::DeserializedV0IdentityKind DeserializedV0Identity::GetKind() {
+  return np_ffi::internal::np_ffi_DeserializedV0Identity_kind(v0_identity_);
+}
+
+V0Payload::V0Payload(V0Payload &&other) noexcept
+    : v0_payload_(other.v0_payload_), moved_(other.moved_) {
+  other.v0_payload_ = {};
+  other.moved_ = true;
+}
+
+V0Payload &V0Payload::operator=(V0Payload &&other) noexcept {
+  if (this != &other) {
+    if (!this->moved_) {
+      auto result =
+          np_ffi::internal::np_ffi_deallocate_v0_payload(this->v0_payload_);
+      assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+    }
+    this->v0_payload_ = other.v0_payload_;
+    this->moved_ = other.moved_;
+
+    other.moved_ = true;
+    other.v0_payload_ = {};
+  }
+  return *this;
+}
+
+V0Payload::~V0Payload() {
+  if (!this->moved_) {
+    auto result =
+        np_ffi::internal::np_ffi_deallocate_v0_payload(this->v0_payload_);
+    assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+  }
+}
+
+absl::StatusOr<V0DataElement> V0Payload::TryGetDataElement(uint8_t index) {
+  assert_panic(!this->moved_);
+  auto result = np_ffi::internal::np_ffi_V0Payload_get_de(v0_payload_, index);
+  auto kind = np_ffi::internal::np_ffi_GetV0DEResult_kind(result);
+  switch (kind) {
+  case GetV0DEResultKind::Success: {
+    auto de = np_ffi_GetV0DEResult_into_SUCCESS(result);
+    return V0DataElement(de);
+  }
+  case GetV0DEResultKind::Error: {
+    return absl::OutOfRangeError("Invalid Data Element index");
+  }
+  }
+}
+
+V0DataElementKind V0DataElement::GetKind() {
+  return np_ffi::internal::np_ffi_V0DataElement_kind(v0_data_element_);
+}
+
+TxPower V0DataElement::AsTxPower() {
+  return np_ffi::internal::np_ffi_V0DataElement_into_TX_POWER(v0_data_element_);
+}
+
+V0Actions V0DataElement::AsActions() {
+  auto internal =
+      np_ffi::internal::np_ffi_V0DataElement_into_ACTIONS(v0_data_element_);
+  return V0Actions(internal);
+}
+
+uint32_t V0Actions::GetAsU32() {
+  return np_ffi::internal::np_ffi_V0Actions_as_u32(actions_);
+}
+
+bool V0Actions::HasAction(BooleanActionType action) {
+  return np_ffi::internal::np_ffi_V0Actions_has_action(actions_, action);
+}
+
+uint8_t V0Actions::GetContextSyncSequenceNumber() {
+  return np_ffi::internal::np_ffi_V0Actions_get_context_sync_sequence_number(
+      actions_);
+}
+
+// This is called after all references to the shared_ptr have gone out of scope
+auto DeallocateV1Adv(
+    np_ffi::internal::DeserializedV1Advertisement *v1_advertisement) {
+  auto result =
+      np_ffi::internal::np_ffi_deallocate_deserialized_V1_advertisement(
+          *v1_advertisement);
+  assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+  delete v1_advertisement;
+}
+
+DeserializedV1Advertisement::DeserializedV1Advertisement(
+    np_ffi::internal::DeserializedV1Advertisement v1_advertisement) {
+  v1_advertisement_ =
+      std::shared_ptr<np_ffi::internal::DeserializedV1Advertisement>(
+          new np_ffi::internal::DeserializedV1Advertisement(v1_advertisement),
+          DeallocateV1Adv);
+}
+
+DeserializedV1Advertisement::DeserializedV1Advertisement(
+    DeserializedV1Advertisement &&other) noexcept
+    : v1_advertisement_(std::move(other.v1_advertisement_)) {}
+
+DeserializedV1Advertisement &DeserializedV1Advertisement::operator=(
+    DeserializedV1Advertisement &&other) noexcept {
+  if (this != &other) {
+    this->v1_advertisement_ = std::move(other.v1_advertisement_);
+  }
+  return *this;
+}
+
+// V1 Stuff
+uint8_t DeserializedV1Advertisement::GetNumLegibleSections() {
+  assert_panic(this->v1_advertisement_ != nullptr);
+  return np_ffi::internal::
+      np_ffi_DeserializedV1Advertisement_get_num_legible_sections(
+          *v1_advertisement_);
+}
+
+uint8_t DeserializedV1Advertisement::GetNumUndecryptableSections() {
+  assert_panic(this->v1_advertisement_ != nullptr);
+  return np_ffi::internal::
+      np_ffi_DeserializedV1Advertisement_get_num_undecryptable_sections(
+          *v1_advertisement_);
+}
+
+absl::StatusOr<DeserializedV1Section>
+DeserializedV1Advertisement::TryGetSection(uint8_t section_index) {
+  assert_panic(this->v1_advertisement_ != nullptr);
+  auto result =
+      np_ffi::internal::np_ffi_DeserializedV1Advertisement_get_section(
+          *v1_advertisement_, section_index);
+  auto kind = np_ffi::internal::np_ffi_GetV1SectionResult_kind(result);
+  switch (kind) {
+  case np_ffi::internal::GetV1SectionResultKind::Error: {
+    return absl::OutOfRangeError("Invalid section index");
+  }
+  case np_ffi::internal::GetV1SectionResultKind::Success: {
+    auto section =
+        np_ffi::internal::np_ffi_GetV1SectionResult_into_SUCCESS(result);
+    return DeserializedV1Section(section, v1_advertisement_);
+  }
+  }
+}
+
+uint8_t DeserializedV1Section::NumberOfDataElements() {
+  return np_ffi::internal::np_ffi_DeserializedV1Section_get_num_des(section_);
+}
+
+DeserializedV1IdentityKind DeserializedV1Section::GetIdentityKind() {
+  return np_ffi::internal::np_ffi_DeserializedV1Section_get_identity_kind(
+      section_);
+}
+
+absl::StatusOr<V1DataElement>
+DeserializedV1Section::TryGetDataElement(uint8_t index) {
+  auto result =
+      np_ffi::internal::np_ffi_DeserializedV1Section_get_de(section_, index);
+  auto kind = np_ffi::internal::np_ffi_GetV1DEResult_kind(result);
+  switch (kind) {
+  case np_ffi::internal::GetV1DEResultKind::Error: {
+    return absl::OutOfRangeError("Invalid data element index for this section");
+  }
+  case np_ffi::internal::GetV1DEResultKind::Success: {
+    return V1DataElement(
+        np_ffi::internal::np_ffi_GetV1DEResult_into_SUCCESS(result));
+  }
+  }
+}
+
+uint32_t V1DataElement::GetDataElementTypeCode() const {
+  return np_ffi::internal::np_ffi_V1DEType_to_uint32_t(
+      v1_data_element_.generic._0.de_type);
+}
+
+ByteBuffer<127> V1DataElement::GetPayload() const {
+  return ByteBuffer(v1_data_element_.generic._0.payload);
+}
+
+} // namespace nearby_protocol
diff --git a/nearby/presence/np_cpp_ffi/sample/CMakeLists.txt b/nearby/presence/np_cpp_ffi/sample/CMakeLists.txt
new file mode 100644
index 0000000..da33258
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/sample/CMakeLists.txt
@@ -0,0 +1,29 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+add_executable(np_cpp_sample main.cpp)
+
+target_link_libraries(np_cpp_sample nearby_protocol)
+
+if (UNIX)
+    target_link_libraries(
+            np_cpp_sample
+            dl -fsanitize=address
+    )
+elseif (MSVC)
+    target_link_libraries(
+            np_cpp_sample
+            bcrypt ntdll userenv ws2_32
+    )
+endif ()
diff --git a/nearby/presence/np_cpp_ffi/sample/main.cpp b/nearby/presence/np_cpp_ffi/sample/main.cpp
new file mode 100644
index 0000000..114ed64
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/sample/main.cpp
@@ -0,0 +1,272 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+
+#include <bitset>
+#include <iostream>
+
+#include "absl/strings/escaping.h"
+
+static void SamplePanicHandler(nearby_protocol::PanicReason reason);
+
+void HandleAdvertisementResult(nearby_protocol::DeserializeAdvertisementResult);
+
+void HandleV0Adv(nearby_protocol::DeserializedV0Advertisement);
+void HandleLegibleV0Adv(nearby_protocol::LegibleDeserializedV0Advertisement);
+void HandleV0Identity(nearby_protocol::DeserializedV0Identity);
+void HandleDataElement(nearby_protocol::V0DataElement);
+
+void HandleV1Adv(nearby_protocol::DeserializedV1Advertisement);
+void HandleV1Section(nearby_protocol::DeserializedV1Section);
+void HandleV1DataElement(nearby_protocol::V1DataElement);
+
+int main() {
+  auto result =
+      nearby_protocol::GlobalConfig::SetPanicHandler(SamplePanicHandler);
+  if (result) {
+    std::cout << "Successfully registered panic handler\n";
+  } else {
+    std::cout << "Failed register panic handler\n";
+    return -1;
+  }
+  nearby_protocol::GlobalConfig::SetNumShards(4);
+
+  std::cout << "\n========= Example V0 Adv ==========\n";
+  std::cout << "Hex bytes: 00031503260046\n\n";
+
+  // Create an empty credential book and verify that is is successful
+  auto cred_book_result = nearby_protocol::CredentialBook::TryCreate();
+  if (!cred_book_result.ok()) {
+    std::cout << cred_book_result.status().ToString();
+    return -1;
+  }
+
+  auto v0_byte_string = "00"      // Adv Header
+                        "03"      // Public DE header
+                        "1503"    // Length 1 Tx Power DE with value 3
+                        "260046"; // Length 2 Actions
+
+  auto v0_bytes = absl::HexStringToBytes(v0_byte_string);
+  auto v0_buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(v0_bytes);
+  nearby_protocol::RawAdvertisementPayload v0_payload(v0_buffer.value());
+
+  // Try to deserialize a V0 payload
+  auto deserialize_v0_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          v0_payload, cred_book_result.value());
+  HandleAdvertisementResult(std::move(deserialize_v0_result));
+
+  std::cout << "\n========= Example V1 Adv ==========\n";
+  std::cout << "Hex bytes: 20040326004603031505\n\n";
+
+  auto v1_byte_string = "20"     // V1 Advertisement header
+                        "04"     // Section Header
+                        "03"     // Public Identity DE header
+                        "260046" // Length 2 Actions DE
+                        "03"     // Section Header
+                        "03"     // Public Identity DE header
+                        "1505";  // Length 1 Tx Power DE with value 5
+  auto v1_bytes = absl::HexStringToBytes(v1_byte_string);
+  auto v1_buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(v1_bytes);
+  nearby_protocol::RawAdvertisementPayload v1_payload(v1_buffer.value());
+
+  // Try to deserialize a V1 payload
+  auto deserialize_v1_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          v1_payload, cred_book_result.value());
+  HandleAdvertisementResult(std::move(deserialize_v1_result));
+
+  std::cout << "\n========= User input sample ==========\n\n";
+  while (true) {
+    std::string user_input;
+    std::cout << "Enter the hex of the advertisement you would like to parse "
+                 "(see above examples): ";
+    std::cin >> user_input;
+    auto bytes = absl::HexStringToBytes(user_input);
+    auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+    if (!buffer.ok()) {
+      std::cout << "Too many bytes provided, must fit into a max length 255 "
+                   "byte BLE advertisement\n";
+      continue;
+    }
+    nearby_protocol::RawAdvertisementPayload user_input_payload(buffer.value());
+
+    // Try to deserialize user input
+    auto user_input_result =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            user_input_payload, cred_book_result.value());
+    HandleAdvertisementResult(std::move(user_input_result));
+
+    char choice;
+    do {
+      std::cout << "Do you want to continue? (Y/N) ";
+      std::cin >> choice;
+    } while (choice != 'Y' && choice != 'N' && choice != 'n' && choice != 'y');
+
+    if (choice == 'N' || choice == 'n') {
+      return 0;
+    }
+  }
+}
+
+static void SamplePanicHandler(nearby_protocol::PanicReason reason) {
+  std::cout << "Panicking! Reason: ";
+  switch (reason) {
+  case nearby_protocol::PanicReason::EnumCastFailed: {
+    std::cout << "EnumCastFailed \n";
+    break;
+  }
+  case nearby_protocol::PanicReason::AssertFailed: {
+    std::cout << "AssertFailed \n";
+    break;
+  }
+  case np_ffi::internal::PanicReason::InvalidActionBits: {
+    std::cout << "InvalidActionBits \n";
+    break;
+  }
+  }
+  std::abort();
+}
+
+void HandleAdvertisementResult(
+    nearby_protocol::DeserializeAdvertisementResult result) {
+  switch (result.GetKind()) {
+  case nearby_protocol::DeserializeAdvertisementResultKind::Error:
+    std::cout << "Error in deserializing advertisement!\n";
+    break;
+  case nearby_protocol::DeserializeAdvertisementResultKind::V0:
+    std::cout << "Successfully deserialized a V0 advertisement!\n";
+    HandleV0Adv(result.IntoV0());
+    break;
+  case nearby_protocol::DeserializeAdvertisementResultKind::V1:
+    std::cout << "Successfully deserialized a V1 advertisement\n";
+    HandleV1Adv(result.IntoV1());
+    break;
+  }
+}
+
+void HandleV0Adv(nearby_protocol::DeserializedV0Advertisement result) {
+  switch (result.GetKind()) {
+  case nearby_protocol::DeserializedV0AdvertisementKind::Legible:
+    std::cout << "\tThe Advertisement is plaintext \n";
+    HandleLegibleV0Adv(result.IntoLegible());
+    break;
+  case nearby_protocol::DeserializedV0AdvertisementKind::NoMatchingCredentials:
+    std::cout << "\tNo matching credentials found for this adv\n";
+    return;
+  }
+}
+
+void HandleLegibleV0Adv(
+    nearby_protocol::LegibleDeserializedV0Advertisement legible_adv) {
+  HandleV0Identity(legible_adv.GetIdentity());
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  std::cout << "\t\tAdv contains " << unsigned(num_des) << " data elements \n";
+  auto payload = legible_adv.IntoPayload();
+  for (int i = 0; i < num_des; i++) {
+    auto de_result = payload.TryGetDataElement(i);
+    if (!de_result.ok()) {
+      std::cout << "\t\tError getting DE at index: " << i << "\n";
+      return;
+    }
+    std::cout << "\t\tSuccessfully retrieved De at index " << i << "\n";
+    HandleDataElement(de_result.value());
+  }
+}
+
+void HandleV0Identity(nearby_protocol::DeserializedV0Identity identity) {
+  switch (identity.GetKind()) {
+  case np_ffi::internal::DeserializedV0IdentityKind::Plaintext: {
+    std::cout << "\t\tIdentity is Plaintext\n";
+    break;
+  }
+  case np_ffi::internal::DeserializedV0IdentityKind::Decrypted: {
+    std::cout << "\t\tIdentity is Encrypted\n";
+    break;
+  }
+  }
+}
+
+void HandleDataElement(nearby_protocol::V0DataElement de) {
+  switch (de.GetKind()) {
+  case nearby_protocol::V0DataElementKind::TxPower: {
+    std::cout << "\t\t\tDE Type is TxPower\n";
+    auto tx_power = de.AsTxPower();
+    std::cout << "\t\t\tpower: " << int(tx_power.tx_power) << "\n";
+    return;
+  }
+  case nearby_protocol::V0DataElementKind::Actions: {
+    std::cout << "\t\t\tDE Type is Actions\n";
+    auto actions = de.AsActions();
+    std::cout << "\t\t\tactions: " << std::bitset<32>(actions.GetAsU32())
+              << "\n";
+    return;
+  }
+  }
+}
+
+void HandleV1Adv(nearby_protocol::DeserializedV1Advertisement adv) {
+  auto legible_sections = adv.GetNumLegibleSections();
+  std::cout << "\tAdv has " << unsigned(legible_sections)
+            << " legible sections \n";
+
+  auto encrypted_sections = adv.GetNumUndecryptableSections();
+  std::cout << "\tAdv has " << unsigned(encrypted_sections)
+            << " undecryptable sections\n";
+
+  for (auto i = 0; i < legible_sections; i++) {
+    auto section_result = adv.TryGetSection(i);
+    if (!section_result.ok()) {
+      std::cout << "\tError getting Section at index: " << i << "\n";
+      return;
+    }
+    std::cout << "\tSuccessfully retrieved section at index " << i << "\n";
+    HandleV1Section(section_result.value());
+  }
+}
+
+void HandleV1Section(nearby_protocol::DeserializedV1Section section) {
+  switch (section.GetIdentityKind()) {
+  case np_ffi::internal::DeserializedV1IdentityKind::Plaintext: {
+    std::cout << "\t\tIdentity is Plaintext\n";
+    break;
+  }
+  case np_ffi::internal::DeserializedV1IdentityKind::Decrypted: {
+    std::cout << "\t\tIdentity is Encrypted\n";
+    break;
+  }
+  }
+
+  auto num_des = section.NumberOfDataElements();
+  std::cout << "\t\tSection has " << unsigned(num_des) << " data elements \n";
+  for (auto i = 0; i < num_des; i++) {
+    auto de_result = section.TryGetDataElement(i);
+    if (!de_result.ok()) {
+      std::cout << "\t\tError getting de at index: " << i << "\n";
+      return;
+    }
+    std::cout << "\t\tSuccessfully retrieved data element at index " << i
+              << "\n";
+    HandleV1DataElement(de_result.value());
+  }
+}
+
+void HandleV1DataElement(nearby_protocol::V1DataElement de) {
+  std::cout << "\t\t\tData Element type code: "
+            << unsigned(de.GetDataElementTypeCode()) << "\n";
+  std::cout << "\t\t\tPayload bytes as hex: "
+            << absl::BytesToHexString(de.GetPayload().ToString()) << "\n";
+}
diff --git a/nearby/presence/np_cpp_ffi/shared/shared_test_util.cc b/nearby/presence/np_cpp_ffi/shared/shared_test_util.cc
new file mode 100644
index 0000000..27e98a6
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/shared/shared_test_util.cc
@@ -0,0 +1,50 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+
+std::string PanicReasonToString(nearby_protocol::PanicReason reason) {
+  switch (reason) {
+  case nearby_protocol::PanicReason::EnumCastFailed: {
+    return "EnumCastFailed";
+  }
+  case nearby_protocol::PanicReason::AssertFailed: {
+    return "AssertFailed";
+  }
+  case np_ffi::internal::PanicReason::InvalidActionBits: {
+    return "InvalidActionBits";
+  }
+  }
+}
+
+void test_panic_handler(nearby_protocol::PanicReason reason) {
+  std::cout << "Panicking! Reason: " << PanicReasonToString(reason);
+  std::abort();
+}
+
+std::string generate_hex_string(const size_t length) {
+  char *str = new char[length];
+
+  // hexadecimal characters
+  char hex_characters[] = {'0', '1', '2', '3', '4', '5', '6', '7',
+                           '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
+  size_t i;
+  for (i = 0; i < length; i++) {
+    str[i] = hex_characters[rand() % 16]; // NOLINT(cert-msc50-cpp)
+  }
+  str[length] = 0;
+  std::string result(str, length);
+  delete[] str;
+  return result;
+}
\ No newline at end of file
diff --git a/nearby/presence/np_cpp_ffi/shared/shared_test_util.h b/nearby/presence/np_cpp_ffi/shared/shared_test_util.h
new file mode 100644
index 0000000..52c5363
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/shared/shared_test_util.h
@@ -0,0 +1,58 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef NEARBY_PRESENCE_NP_CPP_FFI_TESTS_SHARED_TEST_UTILS_H_
+#define NEARBY_PRESENCE_NP_CPP_FFI_TESTS_SHARED_TEST_UTILS_H_
+
+#include "nearby_protocol.h"
+
+inline nearby_protocol::RawAdvertisementPayload
+    V0AdvEmpty(nearby_protocol::ByteBuffer<255>({1, {0x00}}));
+
+inline nearby_protocol::RawAdvertisementPayload
+    V0AdvSimple(nearby_protocol::ByteBuffer<255>({
+        4,
+        {0x00,       // Adv Header
+         0x03,       // Public DE header
+         0x15, 0x03} // Length 1 Tx Power DE with value 3
+    }));
+
+inline nearby_protocol::RawAdvertisementPayload
+    V1AdvSimple(nearby_protocol::ByteBuffer<255>(
+        {5,
+         {
+             0x20,      // V1 Advertisement header
+             0x03,      // Section Header
+             0x03,      // Public Identity DE header
+             0x15, 0x03 // Length 1 Tx Power DE with value 3
+         }}));
+
+inline nearby_protocol::RawAdvertisementPayload
+    V1AdvMultipleSections(nearby_protocol::ByteBuffer<255>(
+        {10,
+         {
+             0x20,             // V1 Advertisement header
+             0x04,             // Section Header
+             0x03,             // Public Identity DE header
+             0x26, 0x00, 0x46, // Length 2 Actions DE
+             0x03,             // Section Header
+             0x03,             // Public Identity DE header
+             0x15, 0x03        // Length 1 Tx Power DE with value 3
+         }}));
+
+void test_panic_handler(nearby_protocol::PanicReason reason);
+
+std::string generate_hex_string(size_t length);
+
+#endif // NEARBY_PRESENCE_NP_CPP_FFI_TESTS_SHARED_TEST_UTILS_H_
diff --git a/nearby/presence/np_cpp_ffi/tests/CMakeLists.txt b/nearby/presence/np_cpp_ffi/tests/CMakeLists.txt
new file mode 100644
index 0000000..bddda64
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/CMakeLists.txt
@@ -0,0 +1,44 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+add_executable(
+        np_ffi_tests
+        deserialize_result_tests.cc
+        deserialize_v0_tests.cc
+        deserialize_v1_tests.cc
+        global_config_tests.cc
+        credential_book_tests.cc
+        byte_buffer_tests.cc
+)
+
+target_link_libraries(
+        np_ffi_tests
+        nearby_protocol
+        shared_test_util
+        GTest::gtest_main
+)
+
+if (UNIX)
+    target_link_libraries(
+            np_ffi_tests
+            dl -fsanitize=address
+    )
+elseif (MSVC)
+    target_link_libraries(
+            np_ffi_tests
+            bcrypt ntdll userenv ws2_32
+    )
+endif ()
+
+gtest_discover_tests(np_ffi_tests)
diff --git a/nearby/presence/np_cpp_ffi/tests/byte_buffer_tests.cc b/nearby/presence/np_cpp_ffi/tests/byte_buffer_tests.cc
new file mode 100644
index 0000000..4bca8ec
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/byte_buffer_tests.cc
@@ -0,0 +1,84 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on a "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+#include "shared_test_util.h"
+
+#include "absl/strings/escaping.h"
+#include "gtest/gtest.h"
+
+TEST(ByteBufferTests, ByteBufferMaxLength) {
+  // Each hex byte takes up 2 characters so length 510 string = 255 bytes of hex
+  auto str_bytes = generate_hex_string(510);
+  auto bytes = absl::HexStringToBytes(str_bytes);
+  auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+  ASSERT_TRUE(buffer.ok());
+  auto string = buffer.value().ToString();
+  ASSERT_EQ(bytes, string);
+}
+
+TEST(ByteBufferTooLarge, ByteBufferInvalidLength) {
+  // 256 bytes should fail
+  auto str_bytes = generate_hex_string(512);
+  auto bytes = absl::HexStringToBytes(str_bytes);
+  auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+  ASSERT_FALSE(buffer.ok());
+}
+
+TEST(ByteBufferTests, ByteBufferRoundTrip) {
+  auto bytes = absl::HexStringToBytes("2003031503");
+  auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+  auto string = buffer.value().ToString();
+  ASSERT_EQ(bytes, string);
+}
+
+TEST(ByteBufferTests, ByteBufferPayloadWrongSize) {
+  auto bytes = absl::HexStringToBytes("1111111111111111111111");
+  auto buffer = nearby_protocol::ByteBuffer<10>::CopyFrom(bytes);
+  ASSERT_FALSE(buffer.ok());
+}
+
+TEST(ByteBufferTests, ByteBufferEmptyString) {
+  auto bytes = absl::HexStringToBytes("");
+  auto buffer = nearby_protocol::ByteBuffer<10>::CopyFrom(bytes);
+  ASSERT_TRUE(buffer.ok());
+}
+
+TEST(ByteBufferTests, ByteBufferToVector) {
+  auto bytes = absl::HexStringToBytes("1234567890");
+  auto buffer = nearby_protocol::ByteBuffer<100>::CopyFrom(bytes);
+  auto vec = buffer.value().ToVector();
+  std::vector<uint8_t> expected{0x12, 0x34, 0x56, 0x78, 0x90};
+  ASSERT_EQ(vec, expected);
+}
+
+TEST(ByteBufferTests, ByteBufferEndToEndPayloadAsString) {
+  std::string bytes = absl::HexStringToBytes("2003031503");
+  auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+  ASSERT_TRUE(buffer.ok());
+
+  nearby_protocol::RawAdvertisementPayload adv(buffer.value());
+
+  auto credential_book = nearby_protocol::CredentialBook::TryCreate();
+  auto str = nearby_protocol::Deserializer::DeserializeAdvertisement(
+                 adv, credential_book.value())
+                 .IntoV1()
+                 .TryGetSection(0)
+                 .value()
+                 .TryGetDataElement(0)
+                 .value()
+                 .GetPayload()
+                 .ToString();
+  ASSERT_EQ(str, absl::HexStringToBytes("03"));
+}
diff --git a/nearby/presence/np_cpp_ffi/tests/credential_book_tests.cc b/nearby/presence/np_cpp_ffi/tests/credential_book_tests.cc
new file mode 100644
index 0000000..5eb9ce2
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/credential_book_tests.cc
@@ -0,0 +1,80 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+#include "shared_test_util.h"
+
+#include "gtest/gtest.h"
+
+TEST(NpFfiCredentialBookTests, TestMoveConstructor) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // Move the credential book into a new object. Using the new object should
+  // still result in success
+  nearby_protocol::CredentialBook next_book(std::move(book));
+  auto deserialize_result_moved =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty,
+                                                              next_book);
+  ASSERT_EQ(deserialize_result_moved.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // The old object should now lead to use after moved assert failure
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   nearby_protocol::Deserializer::DeserializeAdvertisement(
+                       V0AdvEmpty, book), // NOLINT(bugprone-use-after-move)
+               "");
+
+  // moving again should still lead to a use after moved assert failure
+  nearby_protocol::CredentialBook another_moved_book(std::move(book));
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   nearby_protocol::Deserializer::DeserializeAdvertisement(
+                       V0AdvEmpty, another_moved_book),
+               "");
+}
+
+TEST(NpFfiCredentialBookTests, TestMoveAssignment) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // create a second empty credential book
+  auto other_book = nearby_protocol::CredentialBook::TryCreate().value();
+  other_book = std::move(book);
+
+  // new credential book should still be successful
+  auto deserialize_result_other =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty,
+                                                              other_book);
+  ASSERT_EQ(deserialize_result_other.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // The old object should now lead to use after moved assert failure
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   nearby_protocol::Deserializer::DeserializeAdvertisement(
+                       V0AdvEmpty, book), // NOLINT(bugprone-use-after-move)
+               "");
+
+  // moving again should still lead to a use after moved assert failure
+  auto another_moved_book = std::move(book);
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   nearby_protocol::Deserializer::DeserializeAdvertisement(
+                       V0AdvEmpty, another_moved_book),
+               "");
+}
\ No newline at end of file
diff --git a/nearby/presence/np_cpp_ffi/tests/deserialize_result_tests.cc b/nearby/presence/np_cpp_ffi/tests/deserialize_result_tests.cc
new file mode 100644
index 0000000..e3a44d5
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/deserialize_result_tests.cc
@@ -0,0 +1,286 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+#include "shared_test_util.h"
+
+#include "absl/strings/escaping.h"
+#include "gtest/gtest.h"
+
+TEST(NpFfiDeserializeResultTests, TestResultMoveConstructor) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // Now move the result into a new value, and make sure its still valid
+  nearby_protocol::DeserializeAdvertisementResult moved_result(
+      std::move(result));
+  ASSERT_EQ(moved_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto v0 = moved_result.IntoV0();
+  ASSERT_EQ(v0.GetKind(),
+            np_ffi::internal::DeserializedV0AdvertisementKind::Legible);
+
+  // trying to use the moved object should result in a use after free which
+  // triggers an abort
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   result.IntoV0(), // NOLINT(bugprone-use-after-move
+               "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = result.GetKind(), "");
+
+  // moving again should still preserve the moved state and also lead to an
+  // abort
+  nearby_protocol::DeserializeAdvertisementResult moved_again(
+      std::move(moved_result));
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.IntoV0(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetKind(), "");
+}
+
+TEST(NpFfiDeserializeResultTests, DeserializeFromStringView) {
+  auto bytes = absl::HexStringToBytes("00031503");
+  auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+  ASSERT_TRUE(buffer.ok());
+
+  nearby_protocol::RawAdvertisementPayload adv(buffer.value());
+
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          adv, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity = legible_adv.GetIdentity();
+  ASSERT_EQ(identity.GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  ASSERT_EQ(num_des, 1);
+  auto payload = legible_adv.IntoPayload();
+
+  auto de_result = payload.TryGetDataElement(0);
+  ASSERT_TRUE(de_result.ok());
+  auto de = de_result.value();
+
+  ASSERT_EQ(de.GetKind(), nearby_protocol::V0DataElementKind::TxPower);
+  auto tx_power = de.AsTxPower();
+  ASSERT_EQ(tx_power.tx_power, 3);
+}
+
+TEST(NpFfiDeserializeResultTests, TestResultMoveAssignment) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // create a second result
+  auto another_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(another_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // move result into another_result. The original another_result should be
+  // de-allocated.
+  another_result = std::move(result);
+  auto v0 = another_result.IntoV0();
+  ASSERT_EQ(v0.GetKind(),
+            np_ffi::internal::DeserializedV0AdvertisementKind::Legible);
+
+  // original result should now be invalid, using it will trigger a use after
+  // free abort.
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   result.IntoV0(), // NOLINT(bugprone-use-after-move)
+               "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = result.GetKind(), "");
+
+  // moving again should still lead to an error
+  auto moved_again = std::move(result);
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.IntoV0(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetKind(), "");
+}
+
+TEST(NpFfiDeserializeResultTests, TestInvalidPayloadHeader) {
+  ASSERT_TRUE(
+      nearby_protocol::GlobalConfig::SetPanicHandler(test_panic_handler));
+
+  // An invalid header result should result in error
+  nearby_protocol::RawAdvertisementPayload InvalidHeaderPayload(
+      nearby_protocol::ByteBuffer<255>({1, {0xFF}}));
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          InvalidHeaderPayload, maybe_credential_book.value());
+
+  // Errors cannot be casted into further types
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::Error);
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV0(); },
+               "");
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV1(); },
+               "");
+}
+
+TEST(NpFfiDeserializeResultTests, TestInvalidV0Cast) {
+  ASSERT_TRUE(
+      nearby_protocol::GlobalConfig::SetPanicHandler(test_panic_handler));
+
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvSimple, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V1);
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV0(); },
+               "");
+}
+
+TEST(NpFfiDeserializeResultTests, TestInvalidV1Cast) {
+  ASSERT_TRUE(
+      nearby_protocol::GlobalConfig::SetPanicHandler(test_panic_handler));
+
+  // Create an empty credential book and verify that is is successful
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEmpty, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV1(); },
+               "");
+}
+
+TEST(NpFfiDeserializeResultTests, V0UseResultTwice) {
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEmpty, book_result.value());
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // Once this goes out of scope, the entire result will be invalid
+  auto v0_adv = deserialize_result.IntoV0();
+  // Calling intoV0 for a second time is a programmer error and will result
+  // in a crash.
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV0(); },
+               "");
+}
+
+TEST(NpFfiDeserializeResultTests, V1UseResultTwice) {
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvSimple, book_result.value());
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+
+  // Once this goes out of scope, the entire result will be invalid
+  auto v1_adv = deserialize_result.IntoV1();
+  // Calling intoV0 for a second time is a programmer error and will result
+  // in a crash.
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV1(); },
+               "");
+}
+
+TEST(NpFfiDeserializeResultTests, IntoV0AfterOutOfScope) {
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEmpty, book_result.value());
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // Once this goes out of scope, the entire result will be invalid
+  { auto v0_adv = deserialize_result.IntoV0(); }
+
+  // Calling intoV0 for a second time is a programmer error and will result
+  // in a crash.
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV0(); },
+               "");
+}
+
+TEST(NpFfiDeserializeResultTests, IntoV1AfterOutOfScope) {
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvSimple, book_result.value());
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+
+  // Once this goes out of scope, the entire result will be invalid
+  { auto v0_adv = deserialize_result.IntoV1(); }
+
+  // Calling intoV0 for a second time is a programmer error and will result
+  // in a crash.
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV1(); },
+               "");
+}
+
+TEST(NpFfiDeserializeV0Tests, V0ResultKindAfterOutOfScope) {
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEmpty, book_result.value());
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // Once this goes out of scope, the entire result will be invalid
+  { auto v0_adv = deserialize_result.IntoV0(); }
+
+  // Calling intoV0 for a second time is a programmer error and will result
+  // in a crash.
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.GetKind(); }, "");
+}
+
+TEST(NpFfiDeserializeResultTests, V1ResultKindAfterOutOfScope) {
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvSimple, book_result.value());
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+
+  // Once this goes out of scope, the entire result will be invalid
+  { auto v0_adv = deserialize_result.IntoV1(); }
+
+  // Calling intoV0 for a second time is a programmer error and will result
+  // in a crash.
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.GetKind(); }, "");
+}
\ No newline at end of file
diff --git a/nearby/presence/np_cpp_ffi/tests/deserialize_v0_tests.cc b/nearby/presence/np_cpp_ffi/tests/deserialize_v0_tests.cc
new file mode 100644
index 0000000..9781720
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/deserialize_v0_tests.cc
@@ -0,0 +1,610 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+#include "shared_test_util.h"
+
+#include "gtest/gtest.h"
+
+TEST(NpFfiDeserializeV0Tests, V0SingleDataElementTxPower) {
+  nearby_protocol::RawAdvertisementPayload adv(
+      nearby_protocol::ByteBuffer<255>({
+          4,
+          {0x00,       // Adv Header
+           0x03,       // Public DE header
+           0x15, 0x03} // Length 1 Tx Power DE with value 3
+      }));
+
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          adv, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity = legible_adv.GetIdentity();
+  ASSERT_EQ(identity.GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  ASSERT_EQ(num_des, 1);
+  auto payload = legible_adv.IntoPayload();
+
+  auto de_result = payload.TryGetDataElement(0);
+  ASSERT_TRUE(de_result.ok());
+  auto de = de_result.value();
+
+  ASSERT_EQ(de.GetKind(), nearby_protocol::V0DataElementKind::TxPower);
+  auto tx_power = de.AsTxPower();
+  ASSERT_EQ(tx_power.tx_power, 3);
+}
+
+TEST(NpFfiDeserializeV0Tests, V0LengthOneActionsDataElement) {
+  nearby_protocol::RawAdvertisementPayload adv(
+      nearby_protocol::ByteBuffer<255>({
+          4,
+          {0x00,       // Adv Header
+           0x03,       // Public DE header
+           0x16, 0x00} // Length 1 Actions DE
+      }));
+
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          adv, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity = legible_adv.GetIdentity();
+  ASSERT_EQ(identity.GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  ASSERT_EQ(num_des, 1);
+  auto payload = legible_adv.IntoPayload();
+
+  auto de_result = payload.TryGetDataElement(0);
+  ASSERT_TRUE(de_result.ok());
+  auto de = de_result.value();
+
+  ASSERT_EQ(de.GetKind(), nearby_protocol::V0DataElementKind::Actions);
+  auto actions = de.AsActions();
+  ASSERT_EQ(actions.GetAsU32(), 0);
+}
+
+TEST(NpFfiDeserializeV0Tests, V0LengthTwoActionsDataElement) {
+  nearby_protocol::RawAdvertisementPayload adv(
+      nearby_protocol::ByteBuffer<255>({
+          5,
+          {0x00,             // Adv Header
+           0x03,             // Public DE header
+           0x26, 0xD0, 0x46} // Length 2 Actions DE
+      }));
+
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          adv, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity = legible_adv.GetIdentity();
+  ASSERT_EQ(identity.GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  ASSERT_EQ(num_des, 1);
+
+  auto payload = legible_adv.IntoPayload();
+  auto de_result = payload.TryGetDataElement(0);
+  ASSERT_TRUE(de_result.ok());
+  auto de = de_result.value();
+
+  ASSERT_EQ(de.GetKind(), nearby_protocol::V0DataElementKind::Actions);
+  auto actions = de.AsActions();
+  ASSERT_EQ(actions.GetAsU32(), 0xD0460000);
+
+  ASSERT_TRUE(
+      actions.HasAction(nearby_protocol::BooleanActionType::NearbyShare));
+  ASSERT_TRUE(actions.HasAction(nearby_protocol::BooleanActionType::Finder));
+  ASSERT_TRUE(
+      actions.HasAction(nearby_protocol::BooleanActionType::FastPairSass));
+
+  ASSERT_FALSE(
+      actions.HasAction(nearby_protocol::BooleanActionType::ActiveUnlock));
+  ASSERT_FALSE(
+      actions.HasAction(nearby_protocol::BooleanActionType::InstantTethering));
+  ASSERT_FALSE(actions.HasAction(nearby_protocol::BooleanActionType::PhoneHub));
+  ASSERT_FALSE(
+      actions.HasAction(nearby_protocol::BooleanActionType::PresenceManager));
+
+  ASSERT_EQ(actions.GetContextSyncSequenceNumber(), 0xD);
+}
+
+TEST(NpFfiDeserializeV0Tests, V0MultipleDataElements) {
+  nearby_protocol::RawAdvertisementPayload adv(nearby_protocol::ByteBuffer<255>(
+      {7,
+       {
+           0x00,             // Adv Header
+           0x03,             // Public DE header
+           0x15, 0x05,       // Tx Power value 5
+           0x26, 0x00, 0x46, // Length 2 Actions
+       }}));
+
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          adv, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity = legible_adv.GetIdentity();
+  ASSERT_EQ(identity.GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  ASSERT_EQ(num_des, 2);
+  auto payload = legible_adv.IntoPayload();
+
+  auto first_de_result = payload.TryGetDataElement(0);
+  ASSERT_TRUE(first_de_result.ok());
+  auto first_de = first_de_result.value();
+
+  ASSERT_EQ(first_de.GetKind(), nearby_protocol::V0DataElementKind::TxPower);
+  auto power = first_de.AsTxPower();
+  ASSERT_EQ(power.tx_power, 5);
+
+  auto second_de_result = payload.TryGetDataElement(1);
+  ASSERT_TRUE(second_de_result.ok());
+  auto second_de = second_de_result.value();
+
+  ASSERT_EQ(second_de.GetKind(), nearby_protocol::V0DataElementKind::Actions);
+  auto actions = second_de.AsActions();
+  ASSERT_EQ(actions.GetAsU32(), 0x00460000);
+  ASSERT_EQ(actions.GetContextSyncSequenceNumber(), 0);
+}
+
+TEST(NpFfiDeserializeV0Tests, V0EmptyPayload) {
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEmpty, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity = legible_adv.GetIdentity();
+  ASSERT_EQ(identity.GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  ASSERT_EQ(num_des, 0);
+  auto payload = legible_adv.IntoPayload();
+
+  auto result = payload.TryGetDataElement(0);
+  ASSERT_FALSE(result.ok());
+  ASSERT_TRUE(absl::IsOutOfRange(result.status()));
+}
+
+TEST(NpFfiDeserializeV0Tests, TestV0AdvMoveConstructor) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto adv = result.IntoV0();
+
+  // Now move the adv into a new value, and make sure its still valid
+  nearby_protocol::DeserializedV0Advertisement moved_adv(std::move(adv));
+  ASSERT_EQ(moved_adv.GetKind(),
+            np_ffi::internal::DeserializedV0AdvertisementKind::Legible);
+
+  // trying to use the moved object should result in a use after free which
+  // triggers an abort
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   adv.IntoLegible(), // NOLINT(bugprone-use-after-move
+               "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = adv.GetKind(), "");
+
+  // moving again should still preserve the moved state and also lead to an
+  // abort
+  nearby_protocol::DeserializedV0Advertisement moved_again(std::move(adv));
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.IntoLegible(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetKind(), "");
+}
+
+TEST(NpFfiDeserializeResultTests, TestV0AdvMoveAssignment) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto adv = result.IntoV0();
+
+  // create a second result
+  auto another_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(another_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto adv2 = another_result.IntoV0();
+
+  // move adv2 into adv, the original should be deallocated by assignment
+  adv2 = std::move(adv);
+  ASSERT_EQ(adv2.GetKind(),
+            np_ffi::internal::DeserializedV0AdvertisementKind::Legible);
+
+  // original result should now be invalid, using it will trigger a use after
+  // free abort.
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   adv.IntoLegible(), // NOLINT(bugprone-use-after-move)
+               "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = adv.GetKind(), "");
+
+  // moving again should still lead to an error
+  auto moved_again = std::move(adv);
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.IntoLegible(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetKind(), "");
+}
+
+TEST(NpFfiDeserializeV0Tests, V0AdvDestructor) {
+  nearby_protocol::GlobalConfig::SetMaxNumDeserializedV0Advertisements(1);
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+  {
+    auto deserialize_result =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            V0AdvEmpty, book_result.value());
+    ASSERT_EQ(deserialize_result.GetKind(),
+              np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+    // Going over max amount should result in error
+    auto deserialize_result2 =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            V0AdvEmpty, book_result.value());
+    ASSERT_EQ(deserialize_result2.GetKind(),
+              np_ffi::internal::DeserializeAdvertisementResultKind::Error);
+
+    // Calling IntoV0() should move the underlying resources into the v0 object
+    // when both go out of scope only one should be freed
+    auto v0_adv = deserialize_result.IntoV0();
+  }
+
+  // Now that the first v0 adv is out of scope, it should be de-allocated which
+  // will create room for one more to be created.
+  auto deserialize_result3 =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEmpty, book_result.value());
+  ASSERT_EQ(deserialize_result3.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+}
+
+TEST(NpFfiDeserializeV0Tests, V0AdvUseAfterMove) {
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvSimple, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+
+  // Moves the adv into a legible adv, so the original v0_adv is no longer valid
+  [[maybe_unused]] auto legible_adv = v0_adv.IntoLegible();
+  ASSERT_DEATH([[maybe_unused]] auto failure = v0_adv.GetKind(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = v0_adv.IntoLegible(), "");
+}
+
+TEST(NpFfiDeserializeV0Tests, TestLegibleAdvMoveConstructor) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto legible = result.IntoV0().IntoLegible();
+
+  // Now move the adv into a new value, and make sure its still valid
+  nearby_protocol::LegibleDeserializedV0Advertisement moved(std::move(legible));
+  ASSERT_EQ(moved.GetNumberOfDataElements(), 0);
+  ASSERT_EQ(moved.GetIdentity().GetKind(),
+            np_ffi::internal::DeserializedV0IdentityKind::Plaintext);
+
+  // trying to use the moved object should result in a use after free which
+  // triggers an abort
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   legible.GetIdentity(), // NOLINT(bugprone-use-after-move
+               "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = legible.GetNumberOfDataElements(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = legible.IntoPayload(), "");
+
+  // moving again should still preserve the moved state and also lead to an
+  // abort
+  nearby_protocol::LegibleDeserializedV0Advertisement moved_again(
+      std::move(legible));
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetIdentity(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   moved_again.GetNumberOfDataElements(),
+               "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.IntoPayload(), "");
+}
+
+TEST(NpFfiDeserializeResultTests, TestLegibleAdvMoveAssignment) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto legible = result.IntoV0().IntoLegible();
+
+  // create a second result
+  auto another_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(another_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto legible2 = another_result.IntoV0().IntoLegible();
+
+  // move adv2 into adv, the original should be deallocated by assignment
+  legible2 = std::move(legible);
+  ASSERT_EQ(legible2.GetIdentity().GetKind(),
+            np_ffi::internal::DeserializedV0IdentityKind::Plaintext);
+
+  // original result should now be invalid, using it will trigger a use after
+  // free abort.
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   legible.GetIdentity(), // NOLINT(bugprone-use-after-move)
+               "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = legible.GetNumberOfDataElements(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = legible.IntoPayload(), "");
+
+  // moving again should still lead to an error
+  auto moved_again = std::move(legible);
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.IntoPayload(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetIdentity(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   moved_again.GetNumberOfDataElements(),
+               "");
+}
+
+nearby_protocol::LegibleDeserializedV0Advertisement
+CreateLegibleAdv(nearby_protocol::CredentialBook &book) {
+  auto adv = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V0AdvSimple, book);
+  auto v0_adv = adv.IntoV0();
+  return v0_adv.IntoLegible();
+}
+
+TEST(NpFfiDeserializeV0Tests, V0LegibleAdvUseAfterMove) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto legible_adv = CreateLegibleAdv(book);
+
+  // Should be able to use the valid legible adv even though its original parent
+  // is now out of scope.
+  ASSERT_EQ(legible_adv.GetIdentity().GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+  ASSERT_EQ(legible_adv.GetNumberOfDataElements(), 1);
+  [[maybe_unused]] auto payload = legible_adv.IntoPayload();
+
+  // now that the legible adv has moved into the payload it should no longer be
+  // valid
+  ASSERT_DEATH([[maybe_unused]] auto failure = legible_adv.GetIdentity(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   legible_adv.GetNumberOfDataElements(),
+               "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = legible_adv.IntoPayload(), "");
+}
+
+TEST(NpFfiDeserializeV0Tests, LegibleAdvDestructor) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  nearby_protocol::GlobalConfig::SetMaxNumDeserializedV0Advertisements(1);
+  {
+    auto legible_adv = CreateLegibleAdv(book);
+
+    // check that legible adv is valid.
+    ASSERT_EQ(legible_adv.GetIdentity().GetKind(),
+              nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+    ASSERT_EQ(legible_adv.GetNumberOfDataElements(), 1);
+
+    // allocation slots should be full
+    ASSERT_EQ(nearby_protocol::Deserializer::DeserializeAdvertisement(
+                  V0AdvSimple, book)
+                  .GetKind(),
+              nearby_protocol::DeserializeAdvertisementResultKind::Error);
+  }
+
+  // Verify the handle was de-allocated when legible adv went out of scope
+  auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V0AdvSimple, book);
+  ASSERT_EQ(result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+}
+
+nearby_protocol::V0Payload
+CreatePayload(nearby_protocol::CredentialBook &book) {
+  auto legible_adv = CreateLegibleAdv(book);
+  return legible_adv.IntoPayload();
+}
+
+TEST(NpFfiDeserializeV0Tests, V0PayloadDestructor) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  nearby_protocol::GlobalConfig::SetMaxNumDeserializedV0Advertisements(1);
+  {
+    auto payload = CreatePayload(book);
+
+    // check that payload adv is valid even though its parent is out of scope
+    ASSERT_TRUE(payload.TryGetDataElement(0).ok());
+
+    // allocation slots should be full
+    ASSERT_EQ(nearby_protocol::Deserializer::DeserializeAdvertisement(
+                  V0AdvSimple, book)
+                  .GetKind(),
+              nearby_protocol::DeserializeAdvertisementResultKind::Error);
+  }
+
+  // Now that the payload is out of scope its destructor should have been called
+  // freeing the parent handle
+  auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V0AdvSimple, book);
+  ASSERT_EQ(result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+}
+
+TEST(NpFfiDeserializeV0Tests, TestV0PayloadMoveConstructor) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V0AdvSimple, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto payload = result.IntoV0().IntoLegible().IntoPayload();
+
+  // Now move the adv into a new value, and make sure its still valid
+  nearby_protocol::V0Payload moved(std::move(payload));
+  ASSERT_TRUE(moved.TryGetDataElement(0).ok());
+  ASSERT_TRUE(absl::IsOutOfRange(moved.TryGetDataElement(1).status()));
+
+  // trying to use the moved object should result in a use after free which
+  // triggers an abort
+  ASSERT_DEATH([[maybe_unused]] auto failure = payload.TryGetDataElement(
+                   0), // NOLINT(bugprone-use-after-move
+               "");
+
+  // moving again should still preserve the moved state and also lead to an
+  // abort
+  nearby_protocol::V0Payload moved_again(std::move(payload));
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.TryGetDataElement(0),
+               "");
+}
+
+TEST(NpFfiDeserializeResultTests, TestV0PayloadMoveAssignment) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V0AdvSimple, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto payload = result.IntoV0().IntoLegible().IntoPayload();
+
+  // create a second result
+  auto another_result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V0AdvSimple, book);
+  ASSERT_EQ(another_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto payload2 = another_result.IntoV0().IntoLegible().IntoPayload();
+
+  // original should be deallocated by assignment
+  payload2 = std::move(payload);
+  ASSERT_TRUE(payload2.TryGetDataElement(0).ok());
+
+  // original result should now be invalid, using it will trigger a use after
+  // free abort.
+  ASSERT_DEATH([[maybe_unused]] auto failure = payload.TryGetDataElement(
+                   0), // NOLINT(bugprone-use-after-move)
+               "");
+
+  // moving again should still lead to an error
+  auto moved_again = std::move(payload);
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.TryGetDataElement(0),
+               "");
+}
+
+TEST(NpFfiDeserializeV0Tests, InvalidDataElementCast) {
+  ASSERT_TRUE(
+      nearby_protocol::GlobalConfig::SetPanicHandler(test_panic_handler));
+
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvSimple, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity = legible_adv.GetIdentity();
+  ASSERT_EQ(identity.GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  ASSERT_EQ(num_des, 1);
+  auto payload = legible_adv.IntoPayload();
+
+  auto de_result = payload.TryGetDataElement(0);
+  ASSERT_TRUE(de_result.ok());
+  auto de = de_result.value();
+
+  ASSERT_EQ(de.GetKind(), nearby_protocol::V0DataElementKind::TxPower);
+  ASSERT_DEATH([[maybe_unused]] auto failure = de.AsActions();, "");
+}
+
+TEST(NpFfiDeserializeV0Tests, InvalidDataElementIndex) {
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvSimple, maybe_credential_book.value());
+
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+  auto v0_adv = deserialize_result.IntoV0();
+
+  ASSERT_EQ(v0_adv.GetKind(),
+            nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity = legible_adv.GetIdentity();
+  ASSERT_EQ(identity.GetKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  ASSERT_EQ(num_des, 1);
+  auto payload = legible_adv.IntoPayload();
+
+  auto de_result = payload.TryGetDataElement(1);
+  ASSERT_FALSE(de_result.ok());
+  ASSERT_TRUE(absl::IsOutOfRange(de_result.status()));
+}
diff --git a/nearby/presence/np_cpp_ffi/tests/deserialize_v1_tests.cc b/nearby/presence/np_cpp_ffi/tests/deserialize_v1_tests.cc
new file mode 100644
index 0000000..48b881b
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/deserialize_v1_tests.cc
@@ -0,0 +1,254 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+#include "shared_test_util.h"
+
+#include "gtest/gtest.h"
+
+TEST(NpFfiDeserializeV1Tests, V1SimpleTestCase) {
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvSimple, maybe_credential_book.value());
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V1);
+
+  auto v1_adv = deserialize_result.IntoV1();
+  ASSERT_EQ(v1_adv.GetNumLegibleSections(), 1);
+  ASSERT_EQ(v1_adv.GetNumUndecryptableSections(), 0);
+
+  auto invalid = v1_adv.TryGetSection(1);
+  ASSERT_FALSE(invalid.ok());
+  ASSERT_TRUE(absl::IsOutOfRange(invalid.status()));
+
+  auto section = v1_adv.TryGetSection(0);
+  ASSERT_TRUE(section.ok());
+  ASSERT_EQ(section.value().GetIdentityKind(),
+            nearby_protocol::DeserializedV1IdentityKind::Plaintext);
+  ASSERT_EQ(section.value().NumberOfDataElements(), 1);
+
+  auto invalid_de = section.value().TryGetDataElement(1);
+  ASSERT_FALSE(invalid_de.ok());
+  ASSERT_TRUE(absl::IsOutOfRange(invalid_de.status()));
+
+  auto de = section.value().TryGetDataElement(0);
+  ASSERT_TRUE(de.ok());
+  ASSERT_EQ(de.value().GetDataElementTypeCode(), 5);
+
+  auto payload = de.value().GetPayload();
+  auto vec = payload.ToVector();
+  std::vector<uint8_t> expected{3};
+  ASSERT_EQ(vec, expected);
+}
+
+TEST(NpFfiDeserializeV1Tests, V1MultipleSections) {
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvMultipleSections, maybe_credential_book.value());
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V1);
+
+  auto v1_adv = deserialize_result.IntoV1();
+  ASSERT_EQ(v1_adv.GetNumLegibleSections(), 2);
+  ASSERT_EQ(v1_adv.GetNumUndecryptableSections(), 0);
+
+  auto invalid = v1_adv.TryGetSection(2);
+  ASSERT_FALSE(invalid.ok());
+  ASSERT_TRUE(absl::IsOutOfRange(invalid.status()));
+
+  auto section = v1_adv.TryGetSection(0);
+  ASSERT_TRUE(section.ok());
+  ASSERT_EQ(section.value().GetIdentityKind(),
+            nearby_protocol::DeserializedV1IdentityKind::Plaintext);
+  ASSERT_EQ(section.value().NumberOfDataElements(), 1);
+
+  auto invalid_de = section.value().TryGetDataElement(1);
+  ASSERT_FALSE(invalid_de.ok());
+  ASSERT_TRUE(absl::IsOutOfRange(invalid_de.status()));
+
+  auto de = section.value().TryGetDataElement(0);
+  ASSERT_TRUE(de.ok());
+  ASSERT_EQ(de.value().GetDataElementTypeCode(), 6);
+
+  auto payload = de.value().GetPayload();
+  auto vec = payload.ToVector();
+  std::vector<uint8_t> expected{0x00, 0x46};
+  ASSERT_EQ(vec, expected);
+
+  auto section2 = v1_adv.TryGetSection(1);
+  ASSERT_TRUE(section2.ok());
+  ASSERT_EQ(section2.value().GetIdentityKind(),
+            nearby_protocol::DeserializedV1IdentityKind::Plaintext);
+  ASSERT_EQ(section2.value().NumberOfDataElements(), 1);
+}
+
+TEST(NpFfiDeserializeV1Tests, TestV1AdvMoveConstructor) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V1AdvSimple, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+  auto adv = result.IntoV1();
+
+  // Now move the adv into a new value, and make sure its still valid
+  nearby_protocol::DeserializedV1Advertisement moved_adv(std::move(adv));
+  ASSERT_EQ(moved_adv.GetNumLegibleSections(), 1);
+
+  // trying to use the moved object should result in a use after free which
+  // triggers an abort
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          adv.GetNumLegibleSections(), // NOLINT(bugprone-use-after-move
+      "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = adv.GetNumUndecryptableSections(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = adv.TryGetSection(0), "");
+
+  // moving again should still preserve the moved state and also lead to an
+  // abort
+  nearby_protocol::DeserializedV1Advertisement moved_again(std::move(adv));
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          moved_again.GetNumLegibleSections(), // NOLINT(bugprone-use-after-move
+      "");
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   moved_again.GetNumUndecryptableSections(),
+               "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.TryGetSection(0),
+               "");
+}
+
+TEST(NpFfiDeserializeV1Tests, TestV1AdvMoveAssignment) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V1AdvSimple, book);
+  ASSERT_EQ(result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+  auto adv = result.IntoV1();
+
+  // create a second result
+  auto another_result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V1AdvSimple, book);
+  ASSERT_EQ(another_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+  auto adv2 = another_result.IntoV1();
+
+  // move adv2 into adv, the original should be deallocated by assignment
+  adv2 = std::move(adv);
+  ASSERT_EQ(adv2.GetNumLegibleSections(), 1);
+
+  // original result should now be invalid, using it will trigger a use after
+  // free abort.
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          adv.GetNumLegibleSections(), // NOLINT(bugprone-use-after-move
+      "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = adv.GetNumUndecryptableSections(), "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = adv.TryGetSection(0), "");
+
+  // moving again should still lead to an error
+  auto moved_again = std::move(adv);
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          moved_again.GetNumLegibleSections(), // NOLINT(bugprone-use-after-move
+      "");
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   moved_again.GetNumUndecryptableSections(),
+               "");
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.TryGetSection(0),
+               "");
+}
+
+nearby_protocol::DeserializedV1Section
+GetSection(nearby_protocol::CredentialBook &book) {
+  // Create the adv in this scope, so its de-allocated at the end of this call.
+  // The section should still be valid
+  auto v1_adv =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V1AdvSimple, book)
+          .IntoV1();
+  auto section = v1_adv.TryGetSection(0);
+  return section.value();
+}
+
+bool TryDeserializeNewV1Adv(nearby_protocol::CredentialBook &book) {
+  auto adv = nearby_protocol::Deserializer::DeserializeAdvertisement(
+      V1AdvSimple, book);
+  return adv.GetKind() ==
+         np_ffi::internal::DeserializeAdvertisementResultKind::V1;
+}
+
+TEST(NpFfiDeserializeV1Tests, TestSectionOwnership) {
+  // Capping the max number so we can verify that de-allocations are happening
+  nearby_protocol::GlobalConfig::SetMaxNumDeserializedV1Advertisements(1);
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+
+  {
+    auto section = GetSection(maybe_credential_book.value());
+    ASSERT_EQ(section.GetIdentityKind(),
+              nearby_protocol::DeserializedV1IdentityKind::Plaintext);
+    ASSERT_EQ(section.NumberOfDataElements(), 1);
+    ASSERT_TRUE(section.TryGetDataElement(0).ok());
+
+    ASSERT_FALSE(TryDeserializeNewV1Adv(maybe_credential_book.value()));
+  }
+
+  // now that the section has gone out of scope, deserializing a new adv should
+  // succeed
+  ASSERT_TRUE(TryDeserializeNewV1Adv(maybe_credential_book.value()));
+}
+
+void NestedGetSectionsPart2(nearby_protocol::DeserializedV1Advertisement &adv,
+                            nearby_protocol::CredentialBook &book) {
+  { auto section = adv.TryGetSection(1); }
+  assert(!TryDeserializeNewV1Adv(book));
+}
+
+nearby_protocol::DeserializedV1Section
+NestedGetSections(nearby_protocol::CredentialBook &book) {
+  auto v1_adv = nearby_protocol::Deserializer::DeserializeAdvertisement(
+                    V1AdvMultipleSections, book)
+                    .IntoV1();
+  auto section = v1_adv.TryGetSection(0);
+  NestedGetSectionsPart2(v1_adv, book);
+  return section.value();
+}
+
+// Make sure handle stays in scope until all of the sections and adv have gone
+// out of scope
+TEST(NpFfiDeserializeV1Tests, TestSectionOwnershipMultipleSections) {
+  // Capping the max number so we can verify that de-allocations are happening
+  nearby_protocol::GlobalConfig::SetMaxNumDeserializedV1Advertisements(1);
+  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(maybe_credential_book.ok());
+  {
+    auto section = NestedGetSections(maybe_credential_book.value());
+    ASSERT_EQ(section.GetIdentityKind(),
+              nearby_protocol::DeserializedV1IdentityKind::Plaintext);
+    ASSERT_EQ(section.NumberOfDataElements(), 1);
+
+    ASSERT_FALSE(TryDeserializeNewV1Adv(maybe_credential_book.value()));
+  }
+
+  // now that the section has gone out of scope, deserializing a new adv should
+  // succeed
+  ASSERT_TRUE(TryDeserializeNewV1Adv(maybe_credential_book.value()));
+}
\ No newline at end of file
diff --git a/nearby/presence/np_cpp_ffi/tests/global_config_tests.cc b/nearby/presence/np_cpp_ffi/tests/global_config_tests.cc
new file mode 100644
index 0000000..e120aee
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/global_config_tests.cc
@@ -0,0 +1,205 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "nearby_protocol.h"
+#include "shared_test_util.h"
+
+#include <iostream>
+
+#include "gtest/gtest.h"
+
+TEST(NpFfiGlobalConfigTests, TestPanicHandler) {
+  ASSERT_TRUE(
+      nearby_protocol::GlobalConfig::SetPanicHandler(test_panic_handler));
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // Now try to cast the result into the wrong type and verify the process
+  // aborts
+  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV1(); },
+               "");
+}
+
+TEST(NpFfiGlobalConfigTests, TestPanicHandlerTwice) {
+  ASSERT_TRUE(
+      nearby_protocol::GlobalConfig::SetPanicHandler(test_panic_handler));
+
+  // Second time trying to set should fail
+  ASSERT_FALSE(
+      nearby_protocol::GlobalConfig::SetPanicHandler(test_panic_handler));
+}
+
+// There is not much we can actually test here since this will affect memory
+// consumption. This is more of just a simple check that things still work after
+// configuring this
+TEST(NpFfiGlobalConfigTests, TestSetMaxShardsDefault) {
+  // 0 should still work as default behavior
+  nearby_protocol::GlobalConfig::SetNumShards(0);
+
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto book2 = nearby_protocol::CredentialBook::TryCreate().value();
+  auto book3 = nearby_protocol::CredentialBook::TryCreate().value();
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+
+  // Should still work
+  ASSERT_EQ(deserialize_result.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+  // Call again with a lower number, should have no effect. books 2 and 3 should
+  // still work.
+  nearby_protocol::GlobalConfig::SetNumShards(1);
+  auto deserialize_result_2 =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty,
+                                                              book2);
+  ASSERT_EQ(deserialize_result_2.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto deserialize_result_3 =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty,
+                                                              book3);
+  ASSERT_EQ(deserialize_result_3.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+}
+
+TEST(NpFfiGlobalConfigTests, TestSetMaxShardsSmall) {
+  nearby_protocol::GlobalConfig::SetNumShards(1);
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+
+  // should still be able to parse 2 payloads with only one shard
+  auto deserialize_result1 =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(deserialize_result1.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+  auto deserialize_result2 =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvEmpty, book);
+  ASSERT_EQ(deserialize_result2.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+}
+
+TEST(NpFfiGlobalConfigTests, TestSetMaxCredBooks) {
+  nearby_protocol::GlobalConfig::SetMaxNumCredentialBooks(1);
+  auto book1_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book1_result.ok());
+
+  auto book2_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_FALSE(book2_result.ok());
+  ASSERT_TRUE(absl::IsResourceExhausted(book2_result.status()));
+}
+
+TEST(NpFfiGlobalConfigTests, TestSetMaxCredBooksAfterFirstCall) {
+  auto book = nearby_protocol::CredentialBook::TryCreate().value();
+  auto book2 = nearby_protocol::CredentialBook::TryCreate().value();
+  auto book3 = nearby_protocol::CredentialBook::TryCreate().value();
+
+  // setting this after books have already been created should have no affect
+  nearby_protocol::GlobalConfig::SetMaxNumCredentialBooks(1);
+  auto book4_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book4_result.ok());
+}
+
+TEST(NpFfiGlobalConfigTests, TestSetMaxV0Advs) {
+  nearby_protocol::GlobalConfig::SetMaxNumDeserializedV0Advertisements(1);
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  {
+    auto deserialize_result =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            V0AdvEmpty, book_result.value());
+    ASSERT_EQ(deserialize_result.GetKind(),
+              np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+
+    // Going over max amount should result in error
+    auto deserialize_result2 =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            V0AdvEmpty, book_result.value());
+    ASSERT_EQ(deserialize_result2.GetKind(),
+              np_ffi::internal::DeserializeAdvertisementResultKind::Error);
+  }
+
+  // Now that the first v0 adv is out of scope, it will be de-allocated which
+  // will create room for one more to be created.
+  auto deserialize_result3 =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEmpty, book_result.value());
+  ASSERT_EQ(deserialize_result3.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+}
+
+TEST(NpFfiGlobalConfigTests, TestSetMaxV1Advs) {
+  nearby_protocol::GlobalConfig::SetMaxNumDeserializedV1Advertisements(1);
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  {
+    auto deserialize_result =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            V1AdvSimple, book_result.value());
+    ASSERT_EQ(deserialize_result.GetKind(),
+              np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+
+    // Going over max amount should result in error
+    auto deserialize_result2 =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            V1AdvSimple, book_result.value());
+    ASSERT_EQ(deserialize_result2.GetKind(),
+              np_ffi::internal::DeserializeAdvertisementResultKind::Error);
+  }
+
+  // Now that the first v1 adv is out of scope, it will be de-allocated which
+  // will create room for one more to be created.
+  auto deserialize_result3 =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvSimple, book_result.value());
+  ASSERT_EQ(deserialize_result3.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+}
+
+// Same test case as above, but verifies that the de-allocation still succeeds
+// after calling IntoV1() and that no double frees occur.
+TEST(NpFfiGlobalConfigTests, TestSetMaxV1AdvsFreeAfterInto) {
+  nearby_protocol::GlobalConfig::SetMaxNumDeserializedV1Advertisements(1);
+  auto book_result = nearby_protocol::CredentialBook::TryCreate();
+  ASSERT_TRUE(book_result.ok());
+
+  {
+    auto deserialize_result =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            V1AdvSimple, book_result.value());
+    ASSERT_EQ(deserialize_result.GetKind(),
+              np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+
+    // Going over max amount should result in error
+    auto deserialize_result2 =
+        nearby_protocol::Deserializer::DeserializeAdvertisement(
+            V1AdvSimple, book_result.value());
+    ASSERT_EQ(deserialize_result2.GetKind(),
+              np_ffi::internal::DeserializeAdvertisementResultKind::Error);
+
+    // Calling IntoV1() should move the underlying resources into the v0 object
+    // when both go out of scope only one should be freed
+    auto v0_adv = deserialize_result.IntoV1();
+  }
+
+  // Now that the first v1 adv is out of scope, it will be de-allocated which
+  // will create room for one more to be created.
+  auto deserialize_result3 =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvSimple, book_result.value());
+  ASSERT_EQ(deserialize_result3.GetKind(),
+            np_ffi::internal::DeserializeAdvertisementResultKind::V1);
+}
\ No newline at end of file
diff --git a/nearby/presence/np_ed25519/Cargo.toml b/nearby/presence/np_ed25519/Cargo.toml
new file mode 100644
index 0000000..b4bca66
--- /dev/null
+++ b/nearby/presence/np_ed25519/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "np_ed25519"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+array_view.workspace = true
+crypto_provider.workspace = true
+sink.workspace = true
+tinyvec.workspace = true
+
+[features]
+std = ["crypto_provider/std"]
diff --git a/nearby/presence/np_ed25519/src/lib.rs b/nearby/presence/np_ed25519/src/lib.rs
new file mode 100644
index 0000000..60c8302
--- /dev/null
+++ b/nearby/presence/np_ed25519/src/lib.rs
@@ -0,0 +1,286 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Wrappers around NP's usage of ed25519 signatures.
+//!
+//! All of NP's usages of ed25519 signatures are performed
+//! with "context" bytes prepended to the payload to be signed
+//! or verified. These "context" bytes allow for usage of the
+//! same base key-pair for different purposes in the protocol.
+#![no_std]
+#![forbid(unsafe_code)]
+#![deny(missing_docs, clippy::indexing_slicing)]
+
+extern crate core;
+
+use array_view::ArrayView;
+use crypto_provider::ed25519::{
+    Ed25519Provider, KeyPair as _, PublicKey as _, RawPrivateKey, RawPublicKey, RawSignature,
+    Signature as _, SignatureError,
+};
+use crypto_provider::CryptoProvider;
+use sink::{Sink, SinkWriter};
+use tinyvec::ArrayVec;
+
+/// Convenient type-alias for a crypto-provider's Ed25519 key-pair
+type CpKeyPair<C> = <<C as CryptoProvider>::Ed25519 as Ed25519Provider>::KeyPair;
+
+/// Type-alias for the Ed25519 public key type
+type CpPublicKey<C> = <<C as CryptoProvider>::Ed25519 as Ed25519Provider>::PublicKey;
+
+/// Type-alias for the Ed25519 signature type
+type CpSignature<C> = <<C as CryptoProvider>::Ed25519 as Ed25519Provider>::Signature;
+
+/// Maximum length of the combined (context len byte) + (context bytes) + (signing payload)
+/// byte-array which an ed25519 signature will be computed over. This is deliberately
+/// chosen to be large enough to incorporate an entire v1 adv as the signing payload.
+pub const MAX_SIGNATURE_BUFFER_LEN: usize = 512;
+
+/// Representation of an Ed25519 key-pair using the given
+/// [`CryptoProvider`] to back its implementation.
+/// Contains both the public and secret halves of an
+/// asymmetric key, and so it may be used to
+/// both sign and verify message signatures.
+pub struct KeyPair<C: CryptoProvider>(CpKeyPair<C>);
+
+impl<C: CryptoProvider> KeyPair<C> {
+    /// Returns the `KeyPair`'s private key bytes. This method should only ever be called by code
+    /// which securely stores private credentials.
+    pub fn private_key(&self) -> RawPrivateKey {
+        self.0.private_key()
+    }
+
+    /// Builds this key-pair from an array of its private key bytes in the yielded by `private_key`.
+    /// This method should only ever be called by code which securely stores private credentials.
+    pub fn from_private_key(private_key: &RawPrivateKey) -> Self {
+        Self(CpKeyPair::<C>::from_private_key(private_key))
+    }
+
+    /// Sign the given message with the given context and
+    /// return a digital signature. The message is represented
+    /// using a [`SinkWriter`] to allow the caller to construct
+    /// the payload to sign without requiring a fully-assembled
+    /// payload available as a slice.
+    ///
+    /// If the message writer writes too much data (greater than 256 bytes),
+    /// this will return `None` instead of a valid signature,
+    /// and so uses in `np_adv` will use `.expect` on the returned value
+    /// to indicate that this length constraint has been considered.
+    pub fn sign_with_context<W: SinkWriter<DataType = u8>>(
+        &self,
+        context: &SignatureContext,
+        msg_writer: W,
+    ) -> Option<Signature<C>> {
+        let mut buffer = context.create_signature_buffer();
+        buffer.try_extend_from_writer(msg_writer).map(|_| Signature(self.0.sign(buffer.as_ref())))
+    }
+
+    /// Gets the public key of this key-pair
+    pub fn public(&self) -> PublicKey<C> {
+        PublicKey { public_key: self.0.public() }
+    }
+
+    /// Generates an ed25519 keypair from a CSPRNG
+    /// generate is not available in `no-std`
+    #[cfg(feature = "std")]
+    pub fn generate() -> Self {
+        Self(CpKeyPair::<C>::generate())
+    }
+}
+
+/// Error raised when attempting to deserialize a key-pair
+/// from a byte-array, but the bytes do not represent a valid
+/// ed25519 key-pair
+#[derive(Debug)]
+pub struct InvalidKeyPairBytes;
+
+/// Errors yielded when attempting to verify an ed25519 signature.
+#[derive(Debug, PartialEq, Eq)]
+pub enum SignatureVerificationError {
+    /// The payload that we attempted to verify the signature of was too big
+    PayloadTooBig,
+    /// The signature we were checking was invalid for the given payload
+    SignatureInvalid,
+}
+
+impl From<SignatureError> for SignatureVerificationError {
+    fn from(_: SignatureError) -> Self {
+        Self::SignatureInvalid
+    }
+}
+
+/// Representation of an Ed25519 public key used for
+/// signature verification.
+pub struct PublicKey<C: CryptoProvider> {
+    public_key: CpPublicKey<C>,
+}
+
+impl<C: CryptoProvider> PublicKey<C> {
+    /// Succeeds if the signature was a valid signature created via the corresponding
+    /// keypair to this public key using the given [`SignatureContext`] on the given
+    /// message payload. The message payload is represented
+    /// using a [`SinkWriter`] to allow the caller to construct
+    /// the payload to sign without requiring a fully-assembled
+    /// payload available as a slice.
+    ///
+    /// If the message writer writes too much data (greater than 256 bytes),
+    /// this will return `None` instead of a valid signature,
+    /// and so uses in `np_adv` will use `.expect` on the returned value
+    /// to indicate that this length constraint has been considered.
+    pub fn verify_signature_with_context<W: SinkWriter<DataType = u8>>(
+        &self,
+        context: &SignatureContext,
+        msg_writer: W,
+        signature: &Signature<C>,
+    ) -> Result<(), SignatureVerificationError> {
+        let mut buffer = context.create_signature_buffer();
+        let maybe_write_success = buffer.try_extend_from_writer(msg_writer);
+        match maybe_write_success {
+            Some(_) => {
+                self.public_key.verify_strict(buffer.as_ref(), &signature.0)?;
+                Ok(())
+            }
+            None => Err(SignatureVerificationError::PayloadTooBig),
+        }
+    }
+
+    /// Builds an ed25519 public key from an array of bytes in
+    /// the format yielded by `to_bytes`.
+    pub fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidPublicKeyBytes> {
+        CpPublicKey::<C>::from_bytes(bytes)
+            .map(|public_key| Self { public_key })
+            .map_err(|_| InvalidPublicKeyBytes)
+    }
+
+    /// Yields the bytes of this ed25519 public key
+    pub fn to_bytes(&self) -> RawPublicKey {
+        self.public_key.to_bytes()
+    }
+}
+
+impl<C: CryptoProvider> Clone for PublicKey<C> {
+    fn clone(&self) -> Self {
+        Self::from_bytes(&self.to_bytes()).unwrap()
+    }
+}
+
+/// Error raised when attempting to deserialize a public key
+/// from a byte-array, but the bytes do not represent a valid
+/// ed25519 public key
+#[derive(Debug)]
+pub struct InvalidPublicKeyBytes;
+
+/// Representation of an Ed25519 message signature,
+/// which can be checked against a [`PublicKey`]
+/// for validity.
+pub struct Signature<C: CryptoProvider>(CpSignature<C>);
+
+impl<C: CryptoProvider> Signature<C> {
+    /// Returns a slice of the signature bytes
+    pub fn to_bytes(&self) -> RawSignature {
+        self.0.to_bytes()
+    }
+}
+
+/// Error raised when attempting to construct a [`Signature`]
+/// from a byte-array which is not of the proper length or format.
+#[derive(Debug)]
+pub struct InvalidSignatureBytes;
+
+impl<C: CryptoProvider> TryFrom<&[u8]> for Signature<C> {
+    type Error = InvalidSignatureBytes;
+    fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> {
+        bytes
+            .try_into()
+            .map(|sig| Self(CpSignature::<C>::from_bytes(sig)))
+            .map_err(|_| InvalidSignatureBytes)
+    }
+}
+
+/// Minimum length (in bytes) for a [`SignatureContext`] (which cannot be empty).
+pub const MIN_SIGNATURE_CONTEXT_LEN: usize = 1;
+
+/// Maximum length (in bytes) for a [`SignatureContext`] (which uses a 8-bit length field).
+pub const MAX_SIGNATURE_CONTEXT_LEN: usize = 255;
+
+/// (Non-empty) context bytes to use in the construction of NP's
+/// Ed25519 signatures. The context bytes should uniquely
+/// identify the component of the protocol performing the
+/// signature/verification (e.g: advertisement signing,
+/// connection signing), and should be between 1 and
+/// 255 bytes in length.
+pub struct SignatureContext {
+    data: ArrayView<u8, MAX_SIGNATURE_CONTEXT_LEN>,
+}
+
+impl SignatureContext {
+    /// Creates a signature buffer with size bounded by MAX_SIGNATURE_BUFFER_LEN
+    /// which is pre-populated with the contents yielded by
+    /// [`SignatureContext#write_length_prefixed`].
+    fn create_signature_buffer(&self) -> impl Sink<u8> + AsRef<[u8]> {
+        let mut buffer = ArrayVec::<[u8; MAX_SIGNATURE_BUFFER_LEN]>::new();
+        self.write_length_prefixed(&mut buffer).expect("Context should always fit into sig buffer");
+        buffer
+    }
+
+    /// Writes the contents of this signature context, prefixed
+    /// by the length of the context payload to the given byte-sink.
+    /// If writing to the sink failed at some point during this operation,
+    /// `None` will be returned, and the data written to the sink should
+    /// be considered to be invalid.
+    fn write_length_prefixed<S: Sink<u8>>(&self, sink: &mut S) -> Option<()> {
+        let length_byte = self.data.len() as u8;
+        sink.try_push(length_byte)?;
+        sink.try_extend_from_slice(self.data.as_slice())
+    }
+
+    /// Attempts to construct a signature context from the utf-8 bytes
+    /// of the given string. Returns `None` if the passed string
+    /// is invalid to use for signature context bytes.
+    pub const fn from_string_bytes(data_str: &str) -> Result<Self, SignatureContextInvalidLength> {
+        let data_bytes = data_str.as_bytes();
+        Self::from_bytes(data_bytes)
+    }
+
+    #[allow(clippy::indexing_slicing)]
+    const fn from_bytes(bytes: &[u8]) -> Result<Self, SignatureContextInvalidLength> {
+        let num_bytes = bytes.len();
+        if num_bytes < MIN_SIGNATURE_CONTEXT_LEN || num_bytes > MAX_SIGNATURE_CONTEXT_LEN {
+            Err(SignatureContextInvalidLength)
+        } else {
+            let mut array = [0u8; MAX_SIGNATURE_CONTEXT_LEN];
+            let mut i = 0;
+            while i < num_bytes {
+                array[i] = bytes[i];
+                i += 1;
+            }
+            let data = ArrayView::const_from_array(array, bytes.len());
+            Ok(Self { data })
+        }
+    }
+}
+
+/// Error raised when attempting to construct a
+/// [`SignatureContext`] out of data with an
+/// invalid length in bytes.
+#[derive(Debug)]
+pub struct SignatureContextInvalidLength;
+
+impl TryFrom<&[u8]> for SignatureContext {
+    type Error = SignatureContextInvalidLength;
+
+    fn try_from(value: &[u8]) -> Result<Self, Self::Error> {
+        Self::from_bytes(value)
+    }
+}
diff --git a/nearby/presence/np_ffi_core/Cargo.toml b/nearby/presence/np_ffi_core/Cargo.toml
new file mode 100644
index 0000000..5be03a6
--- /dev/null
+++ b/nearby/presence/np_ffi_core/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "np_ffi_core"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+array_view.workspace = true
+np_adv.workspace = true
+handle_map.workspace = true
+crypto_provider.workspace = true
+#TODO: Allow this to be configurable!
+crypto_provider_default = {workspace = true, features = ["rustcrypto"]}
+spin.workspace = true
+
+[features]
+std = []
diff --git a/nearby/presence/np_ffi_core/src/common.rs b/nearby/presence/np_ffi_core/src/common.rs
new file mode 100644
index 0000000..f00c358
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/common.rs
@@ -0,0 +1,293 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Common externally-accessible FFI constructs which are needed
+//! in order to define the interfaces in this crate's various modules.
+
+use alloc::string::String;
+use array_view::ArrayView;
+use handle_map::HandleNotPresentError;
+
+const DEFAULT_MAX_HANDLES: u32 = u32::MAX - 1;
+
+/// Configuration for top-level constants to be used
+/// by the rest of the FFI which are independent of
+/// the programming language which we ultimately
+/// interface with at a higher level.
+#[repr(C)]
+pub struct CommonConfig {
+    /// The number of shards to employ in all handle-maps,
+    /// or zero if we want to use the default.
+    ///
+    /// The default number of shards will depend on whether
+    /// this crate was compiled with the `std` feature or not:
+    /// - If compiled with the `std` feature, the default number
+    ///   of shards will be set to
+    ///   `min(16, std::thread::available_parallelism().unwrap())`,
+    ///   assuming that that call completes successfully.
+    /// - In all other cases, 16 shards will be used by default.
+    num_shards: u8,
+
+    /// The maximum number of credential books which may be active
+    /// at any one time. By default, this value will be set to
+    /// `u32::MAX - 1`, which is the upper-bound on this value.
+    max_num_credential_books: u32,
+
+    /// The maximum number of deserialized v0 advertisements
+    /// which may be active at any one time. By default, this
+    /// value will be set to `u32::MAX - 1`, which is the upper-bound
+    /// on this value.
+    max_num_deserialized_v0_advertisements: u32,
+
+    /// The maximum number of deserialized v1 advertisements
+    /// which may be active at any one time. By default, this
+    /// value will be set to `u32::MAX - 1`, which is the upper-bound
+    /// on this value.
+    max_num_deserialized_v1_advertisements: u32,
+}
+
+impl Default for CommonConfig {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl CommonConfig {
+    pub(crate) const fn new() -> Self {
+        Self {
+            num_shards: 0,
+            max_num_credential_books: DEFAULT_MAX_HANDLES,
+            max_num_deserialized_v0_advertisements: DEFAULT_MAX_HANDLES,
+            max_num_deserialized_v1_advertisements: DEFAULT_MAX_HANDLES,
+        }
+    }
+    #[cfg(feature = "std")]
+    pub(crate) fn num_shards(&self) -> u8 {
+        if self.num_shards == 0 {
+            match std::thread::available_parallelism() {
+                Ok(parallelism) => 16u8.min(parallelism),
+                Err(_) => 16u8,
+            }
+        } else {
+            self.num_shards
+        }
+    }
+    #[cfg(not(feature = "std"))]
+    pub(crate) fn num_shards(&self) -> u8 {
+        if self.num_shards == 0 {
+            16u8
+        } else {
+            self.num_shards
+        }
+    }
+    pub(crate) fn max_num_credential_books(&self) -> u32 {
+        self.max_num_credential_books
+    }
+    pub(crate) fn max_num_deserialized_v0_advertisements(&self) -> u32 {
+        self.max_num_deserialized_v0_advertisements
+    }
+    pub(crate) fn max_num_deserialized_v1_advertisements(&self) -> u32 {
+        self.max_num_deserialized_v1_advertisements
+    }
+    pub(crate) fn set_num_shards(&mut self, num_shards: u8) {
+        self.num_shards = num_shards
+    }
+
+    /// Sets the maximum number of active handles to credential-books
+    /// which may be active at any one time.
+    /// Max value: `u32::MAX - 1`.
+    pub fn set_max_num_credential_books(&mut self, max_num_credential_books: u32) {
+        self.max_num_credential_books = DEFAULT_MAX_HANDLES.min(max_num_credential_books)
+    }
+
+    /// Sets the maximum number of active handles to deserialized v0
+    /// advertisements which may be active at any one time.
+    /// Max value: `u32::MAX - 1`.
+    pub fn set_max_num_deserialized_v0_advertisements(
+        &mut self,
+        max_num_deserialized_v0_advertisements: u32,
+    ) {
+        self.max_num_deserialized_v0_advertisements =
+            DEFAULT_MAX_HANDLES.min(max_num_deserialized_v0_advertisements)
+    }
+
+    /// Sets the maximum number of active handles to deserialized v0
+    /// advertisements which may be active at any one time.
+    /// Max value: `u32::MAX - 1`.
+    pub fn set_max_num_deserialized_v1_advertisements(
+        &mut self,
+        max_num_deserialized_v1_advertisements: u32,
+    ) {
+        self.max_num_deserialized_v1_advertisements =
+            DEFAULT_MAX_HANDLES.min(max_num_deserialized_v1_advertisements)
+    }
+}
+
+static COMMON_CONFIG: spin::RwLock<CommonConfig> = spin::RwLock::new(CommonConfig::new());
+
+pub(crate) fn global_num_shards() -> u8 {
+    COMMON_CONFIG.read().num_shards()
+}
+pub(crate) fn global_max_num_credential_books() -> u32 {
+    COMMON_CONFIG.read().max_num_credential_books()
+}
+pub(crate) fn global_max_num_deserialized_v0_advertisements() -> u32 {
+    COMMON_CONFIG.read().max_num_deserialized_v0_advertisements()
+}
+pub(crate) fn global_max_num_deserialized_v1_advertisements() -> u32 {
+    COMMON_CONFIG.read().max_num_deserialized_v1_advertisements()
+}
+
+/// Sets an override to the number of shards to employ in the NP FFI's
+/// internal handle-maps, which places an upper bound on the number
+/// of writing threads which may make progress at any one time
+/// when concurrently accessing handles of the same type.
+///
+/// By default, this value will be set to 16, or in `std` environments,
+/// the minimum of 16 and the number of available hardware threads.
+/// A shard value override of zero will be interpreted the same
+/// as this default.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of _any_ non-`global_config_set`
+/// API call.
+pub fn global_config_set_num_shards(num_shards: u8) {
+    let mut config = COMMON_CONFIG.write();
+    config.set_num_shards(num_shards);
+}
+
+/// Sets the maximum number of active handles to credential books
+/// which may be active at any one time. Max value: `u32::MAX - 1`.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call utilizing credential books.
+pub fn global_config_set_max_num_credential_books(max_num_credential_books: u32) {
+    let mut config = COMMON_CONFIG.write();
+    config.set_max_num_credential_books(max_num_credential_books);
+}
+
+/// Sets the maximum number of active handles to deserialized v0
+/// advertisements which may be active at any one time.
+/// Max value: `u32::MAX - 1`.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call which references or returns a deserialized V0 advertisement.
+pub fn global_config_set_max_num_deserialized_v0_advertisements(
+    max_num_deserialized_v0_advertisements: u32,
+) {
+    let mut config = COMMON_CONFIG.write();
+    config.set_max_num_deserialized_v0_advertisements(max_num_deserialized_v0_advertisements);
+}
+
+/// Sets the maximum number of active handles to deserialized v1
+/// advertisements which may be active at any one time.
+/// Max value: `u32::MAX - 1`.
+///
+/// Setting this value will have no effect if the handle-maps for the
+/// API have already begun being used by the client code, and any
+/// values set will take effect upon the first usage of any API
+/// call which references or returns a deserialized V1 advertisement.
+pub fn global_config_set_max_num_deserialized_v1_advertisements(
+    max_num_deserialized_v1_advertisements: u32,
+) {
+    let mut config = COMMON_CONFIG.write();
+    config.set_max_num_deserialized_v1_advertisements(max_num_deserialized_v1_advertisements);
+}
+
+// API surfaces:
+
+/// A result-type enum which tells the caller whether/not a deallocation
+/// succeeded or failed due to the requested handle not being present.
+#[repr(C)]
+pub enum DeallocateResult {
+    /// The requested handle to deallocate was not present in the map
+    NotPresent = 0,
+    /// The object behind the handle was successfully deallocated
+    Success = 1,
+}
+
+impl From<Result<(), HandleNotPresentError>> for DeallocateResult {
+    fn from(result: Result<(), HandleNotPresentError>) -> Self {
+        match result {
+            Ok(_) => DeallocateResult::Success,
+            Err(_) => DeallocateResult::NotPresent,
+        }
+    }
+}
+
+/// Represents the raw contents of the service payload data
+/// under the Nearby Presence service UUID
+#[repr(C)]
+pub struct RawAdvertisementPayload {
+    bytes: ByteBuffer<255>,
+}
+
+impl RawAdvertisementPayload {
+    /// Yields a slice of the bytes in this raw advertisement payload.
+    pub fn as_slice(&self) -> &[u8] {
+        self.bytes.as_slice()
+    }
+}
+
+/// A byte-string with a maximum size of N,
+/// where only the first `len` bytes are considered
+/// to contain the actual payload. N is only
+/// permitted to be between 0 and 255.
+#[derive(Clone)]
+#[repr(C)]
+// TODO: Once generic const exprs are stabilized,
+// we could instead make N into a compile-time u8.
+pub struct ByteBuffer<const N: usize> {
+    len: u8,
+    bytes: [u8; N],
+}
+
+impl<const N: usize> ByteBuffer<N> {
+    /// Constructs a byte-buffer from a Rust-side-derived
+    /// ArrayView, which is assumed to be trusted to be
+    /// properly initialized, and with a size-bound
+    /// under 255 bytes.
+    pub(crate) fn from_array_view(array_view: ArrayView<u8, N>) -> Self {
+        let (len, bytes) = array_view.into_raw_parts();
+        let len = len as u8;
+        Self { len, bytes }
+    }
+    /// Yields a slice of the first `self.len` bytes of `self.bytes`.
+    pub fn as_slice(&self) -> &[u8] {
+        &self.bytes[..(self.len as usize)]
+    }
+}
+
+/// Error raised when attempting to cast an enum to
+/// one of its variants, but the value is actually
+/// of a different variant than the requested one.
+pub struct EnumCastError {
+    pub(crate) projection_method_name: String,
+    pub(crate) variant_enum_name: String,
+    pub(crate) variant_type_name: String,
+}
+
+impl core::fmt::Debug for EnumCastError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        write!(
+            f,
+            "Attempted to cast a non-{} to a {} via {}",
+            &self.variant_enum_name, &self.variant_type_name, &self.projection_method_name
+        )
+    }
+}
diff --git a/nearby/presence/np_ffi_core/src/credentials.rs b/nearby/presence/np_ffi_core/src/credentials.rs
new file mode 100644
index 0000000..412ebc1
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/credentials.rs
@@ -0,0 +1,88 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Credential-related data-types and functions
+
+use crate::common::*;
+use crate::utils::FfiEnum;
+use handle_map::{declare_handle_map, HandleLike, HandleMapDimensions, HandleMapFullError};
+
+/// Internal, Rust-side implementation of a credential-book.
+/// See [`CredentialBook`] for the FFI-side handles.
+// TODO(b/283249542): Give this a real definition!
+pub struct CredentialBookInternals;
+
+fn get_credential_book_handle_map_dimensions() -> HandleMapDimensions {
+    HandleMapDimensions {
+        num_shards: global_num_shards(),
+        max_active_handles: global_max_num_credential_books(),
+    }
+}
+
+declare_handle_map! {credential_book, CredentialBook, super::CredentialBookInternals, super::get_credential_book_handle_map_dimensions()}
+use credential_book::CredentialBook;
+
+/// Discriminant for `CreateCredentialBookResult`
+#[repr(u8)]
+pub enum CreateCredentialBookResultKind {
+    /// There was no space left to create a new credential book
+    NoSpaceLeft = 0,
+    /// We created a new credential book behind the given handle.
+    /// The associated payload may be obtained via
+    /// `CreateCredentialBookResult#into_success()`.
+    Success = 1,
+}
+
+/// Result type for `create_credential_book`
+#[repr(u8)]
+#[allow(missing_docs)]
+pub enum CreateCredentialBookResult {
+    NoSpaceLeft = 0,
+    Success(CredentialBook) = 1,
+}
+
+impl From<Result<CredentialBook, HandleMapFullError>> for CreateCredentialBookResult {
+    fn from(result: Result<CredentialBook, HandleMapFullError>) -> Self {
+        match result {
+            Ok(book) => CreateCredentialBookResult::Success(book),
+            Err(_) => CreateCredentialBookResult::NoSpaceLeft,
+        }
+    }
+}
+
+/// Allocates a new credential-book, returning a handle to the created object
+pub fn create_credential_book() -> CreateCredentialBookResult {
+    CredentialBook::allocate(|| CredentialBookInternals).into()
+}
+
+impl FfiEnum for CreateCredentialBookResult {
+    type Kind = CreateCredentialBookResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            CreateCredentialBookResult::NoSpaceLeft => CreateCredentialBookResultKind::NoSpaceLeft,
+            CreateCredentialBookResult::Success(_) => CreateCredentialBookResultKind::Success,
+        }
+    }
+}
+
+impl CreateCredentialBookResult {
+    declare_enum_cast! {into_success, Success, CredentialBook}
+}
+
+/// Deallocates a credential-book by its handle
+pub fn deallocate_credential_book(credential_book: CredentialBook) -> DeallocateResult {
+    credential_book.deallocate().map(|_| ()).into()
+}
+
+/// A handle on a particular v0 shared credential stored within a credential book
+pub struct V0SharedCredential;
diff --git a/nearby/presence/np_ffi_core/src/deserialize/mod.rs b/nearby/presence/np_ffi_core/src/deserialize/mod.rs
new file mode 100644
index 0000000..a651bcf
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/deserialize/mod.rs
@@ -0,0 +1,168 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Core NP Rust FFI structures and methods for advertisement deserialization.
+
+use crate::common::*;
+use crate::credentials::credential_book::CredentialBook;
+use crate::deserialize::v0::*;
+use crate::deserialize::v1::*;
+use crate::utils::FfiEnum;
+use crypto_provider_default::CryptoProviderImpl;
+use handle_map::{HandleLike, HandleMapFullError, HandleNotPresentError};
+
+pub mod v0;
+pub mod v1;
+
+/// Discriminant for `DeserializeAdvertisementResult`.
+#[repr(u8)]
+pub enum DeserializeAdvertisementResultKind {
+    /// Deserializing the advertisement failed, for some reason or another.
+    Error = 0,
+    /// The advertisement was correctly deserialized, and it's a V0 advertisement.
+    /// `DeserializeAdvertisementResult#into_v0()` is the corresponding cast
+    /// to the associated enum variant.
+    V0 = 1,
+    /// The advertisement was correctly deserialized, and it's a V1 advertisement.
+    /// `DeserializeAdvertisementResult#into_v1()` is the corresponding cast
+    /// to the associated enum variant.
+    V1 = 2,
+}
+
+/// The result of calling `np_ffi_deserialize_advertisement`.
+/// Must be explicitly deallocated after use with
+/// a corresponding `np_ffi_deallocate_deserialize_advertisement_result`
+#[repr(u8)]
+pub enum DeserializeAdvertisementResult {
+    /// Deserializing the advertisement failed, for some reason or another.
+    /// `DeserializeAdvertisementResultKind::Error` is the associated enum tag.
+    Error,
+    /// The advertisement was correctly deserialized, and it's a V0 advertisement.
+    /// `DeserializeAdvertisementResultKind::V0` is the associated enum tag.
+    V0(DeserializedV0Advertisement),
+    /// The advertisement was correctly deserialized, and it's a V1 advertisement.
+    /// `DeserializeAdvertisementResultKind::V1` is the associated enum tag.
+    V1(DeserializedV1Advertisement),
+}
+
+impl FfiEnum for DeserializeAdvertisementResult {
+    type Kind = DeserializeAdvertisementResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            DeserializeAdvertisementResult::Error => DeserializeAdvertisementResultKind::Error,
+            DeserializeAdvertisementResult::V0(_) => DeserializeAdvertisementResultKind::V0,
+            DeserializeAdvertisementResult::V1(_) => DeserializeAdvertisementResultKind::V1,
+        }
+    }
+}
+
+impl DeserializeAdvertisementResult {
+    declare_enum_cast! {into_v0, V0, DeserializedV0Advertisement}
+    declare_enum_cast! {into_v1, V1, DeserializedV1Advertisement}
+
+    /// Deallocates any internal data referenced by a `DeserializeAdvertisementResult`
+    pub fn deallocate(self) -> DeallocateResult {
+        match self {
+            DeserializeAdvertisementResult::Error => DeallocateResult::Success,
+            DeserializeAdvertisementResult::V0(adv) => adv.deallocate(),
+            DeserializeAdvertisementResult::V1(adv) => adv.deallocate(),
+        }
+    }
+}
+
+//TODO: Once the `FromResidual` trait is stabilized, we won't need to do this
+enum DeserializeAdvertisementSuccess {
+    V0(DeserializedV0Advertisement),
+    V1(DeserializedV1Advertisement),
+}
+
+struct DeserializeAdvertisementError;
+
+impl From<HandleMapFullError> for DeserializeAdvertisementError {
+    fn from(_: HandleMapFullError) -> Self {
+        DeserializeAdvertisementError
+    }
+}
+
+impl From<HandleNotPresentError> for DeserializeAdvertisementError {
+    fn from(_: HandleNotPresentError) -> Self {
+        DeserializeAdvertisementError
+    }
+}
+
+impl From<np_adv::AdvDeserializationError> for DeserializeAdvertisementError {
+    fn from(_: np_adv::AdvDeserializationError) -> Self {
+        DeserializeAdvertisementError
+    }
+}
+
+type DefaultV0Credential = np_adv::credential::simple::SimpleV0Credential<
+    np_adv::credential::v0::MinimumFootprintV0CryptoMaterial,
+    (),
+>;
+type DefaultV1Credential = np_adv::credential::simple::SimpleV1Credential<
+    np_adv::credential::v1::MinimumFootprintV1CryptoMaterial,
+    (),
+>;
+type DefaultBothCredentialSource =
+    np_adv::credential::source::OwnedBothCredentialSource<DefaultV0Credential, DefaultV1Credential>;
+
+fn deserialize_advertisement_from_slice_internal(
+    adv_payload: &[u8],
+    credential_book: CredentialBook,
+) -> Result<DeserializeAdvertisementSuccess, DeserializeAdvertisementError> {
+    // Deadlock Safety: Credential-book locks always live longer than deserialized advs.
+    let _credential_book_read_guard = credential_book.get()?;
+
+    //TODO(b/283249542): Use an actual credential source
+    let cred_source: DefaultBothCredentialSource = DefaultBothCredentialSource::new_empty();
+
+    let deserialized_advertisement =
+        np_adv::deserialize_advertisement::<_, _, _, _, CryptoProviderImpl>(
+            adv_payload,
+            &cred_source,
+        )?;
+    match deserialized_advertisement {
+        np_adv::DeserializedAdvertisement::V0(adv_contents) => {
+            let adv_handle = DeserializedV0Advertisement::allocate_with_contents(adv_contents)?;
+            Ok(DeserializeAdvertisementSuccess::V0(adv_handle))
+        }
+        np_adv::DeserializedAdvertisement::V1(adv_contents) => {
+            let adv_handle = DeserializedV1Advertisement::allocate_with_contents(adv_contents)?;
+            Ok(DeserializeAdvertisementSuccess::V1(adv_handle))
+        }
+    }
+}
+
+/// Attempts to deserialize an advertisement with the given payload.
+/// Suitable for langs which have a suitably expressive slice-type.
+pub fn deserialize_advertisement_from_slice(
+    adv_payload: &[u8],
+    credential_book: CredentialBook,
+) -> DeserializeAdvertisementResult {
+    let result = deserialize_advertisement_from_slice_internal(adv_payload, credential_book);
+    match result {
+        Ok(DeserializeAdvertisementSuccess::V0(x)) => DeserializeAdvertisementResult::V0(x),
+        Ok(DeserializeAdvertisementSuccess::V1(x)) => DeserializeAdvertisementResult::V1(x),
+        Err(_) => DeserializeAdvertisementResult::Error,
+    }
+}
+
+/// Attempts to deserialize an advertisement with the given payload.
+/// Suitable for langs which don't have an expressive-enough slice type.
+pub fn deserialize_advertisement(
+    adv_payload: &RawAdvertisementPayload,
+    credential_book: CredentialBook,
+) -> DeserializeAdvertisementResult {
+    deserialize_advertisement_from_slice(adv_payload.as_slice(), credential_book)
+}
diff --git a/nearby/presence/np_ffi_core/src/deserialize/v0.rs b/nearby/presence/np_ffi_core/src/deserialize/v0.rs
new file mode 100644
index 0000000..0f4b24b
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/deserialize/v0.rs
@@ -0,0 +1,445 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Core NP Rust FFI structures and methods for v0 advertisement deserialization.
+
+use crate::common::*;
+use crate::credentials::credential_book::CredentialBook;
+use crate::utils::{FfiEnum, LocksLongerThan};
+use alloc::vec::Vec;
+use handle_map::{declare_handle_map, HandleLike, HandleMapDimensions, HandleMapFullError};
+use np_adv::legacy::actions::ActionsDataElement;
+use np_adv::legacy::{data_elements as np_adv_de, Ciphertext, PacketFlavorEnum, Plaintext};
+
+/// Discriminant for possible results of V0 advertisement deserialization
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum DeserializedV0AdvertisementKind {
+    /// The deserialized V0 advertisement was legible.
+    /// The associated payload may be obtained via
+    /// `DeserializedV0Advertisement#into_legible`.
+    Legible = 0,
+    /// The deserialized V0 advertisement is illegible,
+    /// likely meaning that the receiver does not hold
+    /// the proper credentials to be able to read
+    /// the received advertisement.
+    NoMatchingCredentials = 1,
+}
+
+/// Represents a deserialized V0 advertisement
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum DeserializedV0Advertisement {
+    Legible(LegibleDeserializedV0Advertisement),
+    NoMatchingCredentials,
+}
+
+impl FfiEnum for DeserializedV0Advertisement {
+    type Kind = DeserializedV0AdvertisementKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            DeserializedV0Advertisement::Legible(_) => DeserializedV0AdvertisementKind::Legible,
+            DeserializedV0Advertisement::NoMatchingCredentials => {
+                DeserializedV0AdvertisementKind::NoMatchingCredentials
+            }
+        }
+    }
+}
+
+impl DeserializedV0Advertisement {
+    /// Attempts to deallocate memory utilized internally by this V0 advertisement
+    /// (which contains a handle to actual advertisement contents behind-the-scenes).
+    pub fn deallocate(self) -> DeallocateResult {
+        match self {
+            DeserializedV0Advertisement::Legible(adv) => adv.deallocate(),
+            DeserializedV0Advertisement::NoMatchingCredentials => DeallocateResult::Success,
+        }
+    }
+
+    pub(crate) fn allocate_with_contents<'m, M: np_adv::credential::MatchedCredential<'m>>(
+        contents: np_adv::V0AdvContents<'m, M>,
+    ) -> Result<Self, HandleMapFullError> {
+        match contents {
+            np_adv::V0AdvContents::Plaintext(plaintext_contents) => {
+                let adv = LegibleDeserializedV0Advertisement::allocate_with_plaintext_contents(
+                    plaintext_contents,
+                )?;
+                Ok(Self::Legible(adv))
+            }
+            np_adv::V0AdvContents::Decrypted(_) => {
+                unimplemented!();
+            }
+            np_adv::V0AdvContents::NoMatchingCredentials => Ok(Self::NoMatchingCredentials),
+        }
+    }
+
+    declare_enum_cast! {into_legible, Legible, LegibleDeserializedV0Advertisement}
+}
+
+/// Represents a deserialized V0 advertisement whose DE contents may be read
+#[repr(C)]
+pub struct LegibleDeserializedV0Advertisement {
+    num_des: u8,
+    payload: V0Payload,
+    identity: DeserializedV0Identity,
+}
+
+impl LegibleDeserializedV0Advertisement {
+    pub(crate) fn allocate_with_plaintext_contents(
+        contents: np_adv::legacy::deserialize::PlaintextAdvContents,
+    ) -> Result<Self, HandleMapFullError> {
+        let data_elements = contents.to_data_elements();
+        let num_des = data_elements.len() as u8;
+        let payload = V0Payload::allocate_with_data_elements(data_elements)?;
+        Ok(Self { num_des, payload, identity: DeserializedV0Identity::Plaintext })
+    }
+    /// Gets the number of data-elements in this adv's payload
+    /// Suitable as an iteration bound for `Self.into_payload().get_de(...)`.
+    pub fn num_des(&self) -> u8 {
+        self.num_des
+    }
+    /// Destructures this legible advertisement into just the payload
+    pub fn into_payload(self) -> V0Payload {
+        self.payload
+    }
+    /// Destructures this legible advertisement into just the identity information
+    pub fn into_identity(self) -> DeserializedV0Identity {
+        self.identity
+    }
+    /// Deallocates the underlying handle of the payload
+    pub fn deallocate(self) -> DeallocateResult {
+        self.payload.deallocate().map(|_| ()).into()
+    }
+}
+
+/// Discriminant for `DeserializedV0Identity`.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum DeserializedV0IdentityKind {
+    /// The deserialized identity was a plaintext identity.
+    Plaintext = 0,
+    /// The deserialized identity was some decrypted identity.
+    Decrypted = 1,
+}
+
+/// Represents deserialized information about the V0 identity utilized
+/// by a deserialized V0 advertisement
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum DeserializedV0Identity {
+    Plaintext,
+    // TODO: This gets a payload once we support creds
+    Decrypted,
+}
+
+impl FfiEnum for DeserializedV0Identity {
+    type Kind = DeserializedV0IdentityKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            DeserializedV0Identity::Plaintext => DeserializedV0IdentityKind::Plaintext,
+            DeserializedV0Identity::Decrypted => DeserializedV0IdentityKind::Decrypted,
+        }
+    }
+}
+
+/// The internal data-structure used for storing
+/// the payload of a deserialized V0 advertisement.
+pub struct V0PayloadInternals {
+    des: Vec<V0DataElement>,
+}
+
+impl V0PayloadInternals {
+    /// Attempts to get the DE with the given index
+    /// in this v0 payload.
+    fn get_de(&self, index: u8) -> GetV0DEResult {
+        match self.des.get(index as usize) {
+            Some(de) => GetV0DEResult::Success(de.clone()),
+            None => GetV0DEResult::Error,
+        }
+    }
+}
+
+fn get_v0_payload_handle_map_dimensions() -> HandleMapDimensions {
+    HandleMapDimensions {
+        num_shards: global_num_shards(),
+        max_active_handles: global_max_num_deserialized_v0_advertisements(),
+    }
+}
+
+declare_handle_map! {v0_payload, V0Payload, super::V0PayloadInternals, super::get_v0_payload_handle_map_dimensions() }
+use v0_payload::V0Payload;
+
+impl LocksLongerThan<V0Payload> for CredentialBook {}
+
+impl V0Payload {
+    pub(crate) fn allocate_with_data_elements<F: np_adv::legacy::PacketFlavor>(
+        data_elements: Vec<np_adv::legacy::deserialize::PlainDataElement<F>>,
+    ) -> Result<Self, HandleMapFullError> {
+        Self::allocate(move || {
+            let des = data_elements.into_iter().map(V0DataElement::from).collect();
+            V0PayloadInternals { des }
+        })
+    }
+    /// Gets the data-element with the given index in this v0 adv payload
+    pub fn get_de(&self, index: u8) -> GetV0DEResult {
+        match self.get() {
+            Ok(read_guard) => read_guard.get_de(index),
+            Err(_) => GetV0DEResult::Error,
+        }
+    }
+
+    /// Deallocates any underlying data held by a V0Payload
+    pub fn deallocate_payload(&self) -> DeallocateResult {
+        self.deallocate().map(|_| ()).into()
+    }
+}
+
+/// Discriminant of `GetV0DEResult`.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum GetV0DEResultKind {
+    /// The attempt to get the DE succeeded.
+    /// The associated payload may be obtained via
+    /// `GetV0DEResult#into_success`.
+    Success = 0,
+    /// The attempt to get the DE failed,
+    /// possibly due to the requested index being
+    /// out-of-bounds or due to the advertisement
+    /// having been previously deallocated.
+    Error = 1,
+}
+
+/// The result of `V0Payload#get_de`.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum GetV0DEResult {
+    Success(V0DataElement),
+    Error,
+}
+
+impl FfiEnum for GetV0DEResult {
+    type Kind = GetV0DEResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            GetV0DEResult::Success(_) => GetV0DEResultKind::Success,
+            GetV0DEResult::Error => GetV0DEResultKind::Error,
+        }
+    }
+}
+
+impl GetV0DEResult {
+    declare_enum_cast! {into_success, Success, V0DataElement}
+}
+
+/// Discriminant for `V0DataElement`.
+#[repr(u8)]
+pub enum V0DataElementKind {
+    /// A transmission Power (Tx Power) data-element.
+    /// The associated payload may be obtained via
+    /// `V0DataElement#into_tx_power`.
+    TxPower = 0,
+    /// The Actions data-element.
+    /// The associated payload may be obtained via
+    /// `V0DataElement#into_actions`.
+    Actions = 1,
+}
+
+/// Representation of a V0 data element.
+#[repr(C)]
+#[allow(missing_docs)]
+#[derive(Clone)]
+pub enum V0DataElement {
+    TxPower(TxPower),
+    Actions(V0Actions),
+}
+
+impl<F: np_adv::legacy::PacketFlavor> From<np_adv::legacy::deserialize::PlainDataElement<F>>
+    for V0DataElement
+{
+    fn from(de: np_adv::legacy::deserialize::PlainDataElement<F>) -> Self {
+        use np_adv::legacy::deserialize::PlainDataElement;
+        match de {
+            PlainDataElement::Actions(x) => V0DataElement::Actions(x.into()),
+            PlainDataElement::TxPower(x) => V0DataElement::TxPower(x.into()),
+        }
+    }
+}
+
+impl FfiEnum for V0DataElement {
+    type Kind = V0DataElementKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            V0DataElement::Actions(_) => V0DataElementKind::Actions,
+            V0DataElement::TxPower(_) => V0DataElementKind::TxPower,
+        }
+    }
+}
+
+impl V0DataElement {
+    declare_enum_cast! {into_tx_power, TxPower, TxPower}
+    declare_enum_cast! {into_actions, Actions, V0Actions}
+}
+
+/// Representation of a transmission power,
+/// as used for the Tx Power DE in V0 and V1.
+#[derive(Clone)]
+#[repr(C)]
+pub struct TxPower {
+    tx_power: i8,
+}
+
+impl TxPower {
+    /// Yields this Tx Power value as an i8.
+    pub fn as_i8(&self) -> i8 {
+        self.tx_power
+    }
+}
+
+impl From<np_adv_de::TxPowerDataElement> for TxPower {
+    fn from(de: np_adv_de::TxPowerDataElement) -> Self {
+        Self { tx_power: de.tx_power_value() }
+    }
+}
+
+/// Representation of the Actions DE in V0.
+#[derive(Clone)]
+#[repr(C)]
+pub enum V0Actions {
+    /// A set of action bits which were present in a plaintext identity advertisement
+    Plaintext(V0ActionBits),
+    /// A set of action bits which were present in a encrypted identity advertisement
+    Encrypted(V0ActionBits),
+}
+
+impl<F: np_adv::legacy::PacketFlavor> From<np_adv::legacy::actions::ActionsDataElement<F>>
+    for V0Actions
+{
+    fn from(value: ActionsDataElement<F>) -> Self {
+        match F::ENUM_VARIANT {
+            PacketFlavorEnum::Plaintext => {
+                Self::Plaintext(V0ActionBits { bitfield: value.as_u32() })
+            }
+            PacketFlavorEnum::Ciphertext => {
+                Self::Encrypted(V0ActionBits { bitfield: value.as_u32() })
+            }
+        }
+    }
+}
+
+#[repr(C)]
+#[derive(Clone)]
+/// The bitfield data of a VOActions data element
+pub struct V0ActionBits {
+    bitfield: u32,
+}
+
+#[allow(missing_docs)]
+#[repr(u8)]
+/// The possible boolean action types which can be present in an Actions data element
+pub enum BooleanActionType {
+    ActiveUnlock = 8,
+    NearbyShare = 9,
+    InstantTethering = 10,
+    PhoneHub = 11,
+    PresenceManager = 12,
+    Finder = 13,
+    FastPairSass = 14,
+}
+
+impl From<&BooleanActionType> for np_adv::legacy::actions::ActionType {
+    fn from(value: &BooleanActionType) -> Self {
+        match value {
+            BooleanActionType::ActiveUnlock => np_adv::legacy::actions::ActionType::ActiveUnlock,
+            BooleanActionType::NearbyShare => np_adv::legacy::actions::ActionType::NearbyShare,
+            BooleanActionType::InstantTethering => {
+                np_adv::legacy::actions::ActionType::InstantTethering
+            }
+            BooleanActionType::PhoneHub => np_adv::legacy::actions::ActionType::PhoneHub,
+            BooleanActionType::Finder => np_adv::legacy::actions::ActionType::Finder,
+            BooleanActionType::FastPairSass => np_adv::legacy::actions::ActionType::FastPairSass,
+            BooleanActionType::PresenceManager => {
+                np_adv::legacy::actions::ActionType::PresenceManager
+            }
+        }
+    }
+}
+
+/// Error returned if action bits inside of a V0Actions struct are invalid. If the struct was
+/// created by the np_adv deserializer, the bits will always be valid, they are only invalid if a
+/// user reaches in and changes them to something invalid.
+#[derive(Debug)]
+pub struct InvalidActionBits;
+
+impl V0Actions {
+    /// Gets the V0 Action bits as represented by a u32 where the last 8 bits are
+    /// always 0 since V0 actions can only hold up to 24 bits.
+    pub fn as_u32(&self) -> u32 {
+        match self {
+            V0Actions::Plaintext(bits) => bits.bitfield,
+            V0Actions::Encrypted(bits) => bits.bitfield,
+        }
+    }
+
+    /// Return whether a boolean action type is set in this data element
+    #[allow(clippy::expect_used)]
+    pub fn has_action(&self, action_type: &BooleanActionType) -> Result<bool, InvalidActionBits> {
+        match self {
+            V0Actions::Plaintext(action_bits) => {
+                let bits = np_adv::legacy::actions::ActionBits::<Plaintext>::try_from(
+                    action_bits.bitfield,
+                )
+                .map_err(|_| InvalidActionBits)?;
+
+                let actions_de = np_adv::legacy::actions::ActionsDataElement::from(bits);
+                Ok(actions_de
+                    .has_action(&action_type.into())
+                    .expect("BooleanActionType only has one bit"))
+            }
+            V0Actions::Encrypted(action_bits) => {
+                let bits = np_adv::legacy::actions::ActionBits::<Ciphertext>::try_from(
+                    action_bits.bitfield,
+                )
+                .map_err(|_| InvalidActionBits)?;
+
+                let actions_de = np_adv::legacy::actions::ActionsDataElement::from(bits);
+                Ok(actions_de
+                    .has_action(&action_type.into())
+                    .expect("BooleanActionType only has one bit"))
+            }
+        }
+    }
+
+    /// Return the context sequence number from this data element
+    #[allow(clippy::expect_used)]
+    pub fn get_context_sync_seq_num(&self) -> Result<u8, InvalidActionBits> {
+        match self {
+            V0Actions::Plaintext(action_bits) => {
+                let bits = np_adv::legacy::actions::ActionBits::<Plaintext>::try_from(
+                    action_bits.bitfield,
+                )
+                .map_err(|_| InvalidActionBits)?;
+
+                let actions_de = np_adv::legacy::actions::ActionsDataElement::from(bits);
+                Ok(actions_de.context_sync_seq_num().as_u8())
+            }
+            V0Actions::Encrypted(action_bits) => {
+                let bits = np_adv::legacy::actions::ActionBits::<Ciphertext>::try_from(
+                    action_bits.bitfield,
+                )
+                .map_err(|_| InvalidActionBits)?;
+                let actions_de = np_adv::legacy::actions::ActionsDataElement::from(bits);
+                Ok(actions_de.context_sync_seq_num().as_u8())
+            }
+        }
+    }
+}
diff --git a/nearby/presence/np_ffi_core/src/deserialize/v1.rs b/nearby/presence/np_ffi_core/src/deserialize/v1.rs
new file mode 100644
index 0000000..9b4a3f4
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/deserialize/v1.rs
@@ -0,0 +1,401 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Core NP Rust FFI structures and methods for v1 advertisement deserialization.
+
+use crate::common::*;
+use crate::credentials::credential_book::CredentialBook;
+use crate::utils::*;
+use alloc::vec::Vec;
+use array_view::ArrayView;
+use handle_map::{declare_handle_map, HandleLike, HandleMapDimensions, HandleMapFullError};
+
+/// Representation of a deserialized V1 advertisement
+#[repr(C)]
+pub struct DeserializedV1Advertisement {
+    num_legible_sections: u8,
+    num_undecryptable_sections: u8,
+    legible_sections: LegibleV1Sections,
+}
+
+impl DeserializedV1Advertisement {
+    /// Gets the number of legible sections in this deserialized V1 advertisement.
+    pub fn num_legible_sections(&self) -> u8 {
+        self.num_legible_sections
+    }
+
+    /// Gets the number of undecryptable sections in this deserialized V1 advertisement.
+    pub fn num_undecryptable_sections(&self) -> u8 {
+        self.num_undecryptable_sections
+    }
+
+    /// Gets the legible section with the given index
+    /// (which is bounded in `0..self.num_legible_sections()`)
+    pub fn get_section(&self, legible_section_index: u8) -> GetV1SectionResult {
+        match self.legible_sections.get() {
+            Ok(sections_read_guard) => {
+                sections_read_guard.get_section(self.legible_sections, legible_section_index)
+            }
+            Err(_) => GetV1SectionResult::Error,
+        }
+    }
+
+    /// Attempts to deallocate memory utilized internally by this V1 advertisement
+    /// (which contains a handle to actual advertisement contents behind-the-scenes).
+    pub fn deallocate(self) -> DeallocateResult {
+        self.legible_sections.deallocate().map(|_| ()).into()
+    }
+
+    pub(crate) fn allocate_with_contents<'m, M: np_adv::credential::MatchedCredential<'m>>(
+        contents: np_adv::V1AdvContents<'m, M>,
+    ) -> Result<Self, HandleMapFullError> {
+        // 16-section limit enforced by np_adv
+        let num_undecryptable_sections = contents.invalid_sections_count() as u8;
+        let legible_sections = contents.into_valid_sections();
+        let num_legible_sections = legible_sections.len() as u8;
+        let legible_sections = LegibleV1Sections::allocate_with_contents(legible_sections)?;
+        Ok(Self { num_undecryptable_sections, num_legible_sections, legible_sections })
+    }
+}
+
+/// Internal, Rust-side implementation of a listing of legible sections
+/// in a deserialized V1 advertisement
+pub struct LegibleV1SectionsInternals {
+    sections: Vec<DeserializedV1SectionInternals>,
+}
+
+impl LegibleV1SectionsInternals {
+    fn get_section_internals(
+        &self,
+        legible_section_index: u8,
+    ) -> Option<&DeserializedV1SectionInternals> {
+        self.sections.get(legible_section_index as usize)
+    }
+    fn get_section(
+        &self,
+        legible_sections_handle: LegibleV1Sections,
+        legible_section_index: u8,
+    ) -> GetV1SectionResult {
+        match self.get_section_internals(legible_section_index) {
+            Some(section_ref) => {
+                // Determine whether the section is plaintext
+                // or decrypted to report back to the caller,
+                // and also determine the number of contained DEs.
+                let num_des = section_ref.num_des();
+                let identity_tag = section_ref.identity_kind();
+                GetV1SectionResult::Success(DeserializedV1Section {
+                    legible_sections_handle,
+                    legible_section_index,
+                    num_des,
+                    identity_tag,
+                })
+            }
+            None => GetV1SectionResult::Error,
+        }
+    }
+}
+
+impl<'m, M: np_adv::credential::MatchedCredential<'m>>
+    From<Vec<np_adv::V1DeserializedSection<'m, M>>> for LegibleV1SectionsInternals
+{
+    fn from(contents: Vec<np_adv::V1DeserializedSection<'m, M>>) -> Self {
+        let sections = contents.into_iter().map(DeserializedV1SectionInternals::from).collect();
+        Self { sections }
+    }
+}
+
+fn get_legible_v1_sections_handle_map_dimensions() -> HandleMapDimensions {
+    HandleMapDimensions {
+        num_shards: global_num_shards(),
+        max_active_handles: global_max_num_deserialized_v1_advertisements(),
+    }
+}
+
+declare_handle_map! {legible_v1_sections, LegibleV1Sections, super::LegibleV1SectionsInternals, super::get_legible_v1_sections_handle_map_dimensions() }
+use legible_v1_sections::LegibleV1Sections;
+
+impl LocksLongerThan<LegibleV1Sections> for CredentialBook {}
+
+impl LegibleV1Sections {
+    pub(crate) fn allocate_with_contents<'m, M: np_adv::credential::MatchedCredential<'m>>(
+        contents: Vec<np_adv::V1DeserializedSection<'m, M>>,
+    ) -> Result<Self, HandleMapFullError> {
+        Self::allocate(move || LegibleV1SectionsInternals::from(contents))
+    }
+}
+
+/// Discriminant for `GetV1SectionResult`
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum GetV1SectionResultKind {
+    /// The attempt to get the section failed,
+    /// possibly due to the section index being
+    /// out-of-bounds or due to the underlying
+    /// advertisement having already been deallocated.
+    Error = 0,
+    /// The attempt to get the section succeeded.
+    /// The wrapped section may be obtained via
+    /// `GetV1SectionResult#into_success`.
+    Success = 1,
+}
+
+/// The result of attempting to get a particular V1 section
+/// from its' index within the list of legible sections
+/// via `DeserializedV1Advertisement::get_section`.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum GetV1SectionResult {
+    Error,
+    Success(DeserializedV1Section),
+}
+
+impl FfiEnum for GetV1SectionResult {
+    type Kind = GetV1SectionResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            GetV1SectionResult::Error => GetV1SectionResultKind::Error,
+            GetV1SectionResult::Success(_) => GetV1SectionResultKind::Success,
+        }
+    }
+}
+
+impl GetV1SectionResult {
+    declare_enum_cast! {into_success, Success, DeserializedV1Section}
+}
+
+/// The internal FFI-friendly representation of a deserialized v1 section
+pub struct DeserializedV1SectionInternals {
+    des: Vec<V1DataElement>,
+    identity: DeserializedV1Identity,
+}
+
+impl DeserializedV1SectionInternals {
+    /// Gets the number of data-elements in this section.
+    fn num_des(&self) -> u8 {
+        self.des.len() as u8
+    }
+    /// Gets the enum tag of the identity used for this section.
+    fn identity_kind(&self) -> DeserializedV1IdentityKind {
+        self.identity.kind()
+    }
+    /// Attempts to get the DE with the given index in this section.
+    fn get_de(&self, index: u8) -> GetV1DEResult {
+        match self.des.get(index as usize) {
+            Some(de) => GetV1DEResult::Success(de.clone()),
+            None => GetV1DEResult::Error,
+        }
+    }
+}
+
+impl<'m, M: np_adv::credential::MatchedCredential<'m>> From<np_adv::V1DeserializedSection<'m, M>>
+    for DeserializedV1SectionInternals
+{
+    fn from(section: np_adv::V1DeserializedSection<'m, M>) -> Self {
+        use np_adv::extended::deserialize::Section;
+        use np_adv::V1DeserializedSection;
+        match section {
+            V1DeserializedSection::Plaintext(section) => {
+                let des = section.data_elements().map(V1DataElement::from).collect();
+                let identity = DeserializedV1Identity::Plaintext;
+                Self { des, identity }
+            }
+            V1DeserializedSection::Decrypted(_) => {
+                unimplemented!();
+            }
+        }
+    }
+}
+/// Discriminant for `DeserializedV1Identity`.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum DeserializedV1IdentityKind {
+    /// The deserialized v1 identity was plaintext
+    Plaintext = 0,
+    /// The deserialized v1 identity corresponded
+    /// to some kind of decrypted identity.
+    Decrypted = 1,
+}
+
+/// Deserialized information about the identity
+/// employed in a V1 adveritsement section.
+#[derive(Clone, Copy)]
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum DeserializedV1Identity {
+    Plaintext,
+    // TODO: This gets a payload once we support creds
+    Decrypted,
+}
+
+impl FfiEnum for DeserializedV1Identity {
+    type Kind = DeserializedV1IdentityKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            DeserializedV1Identity::Plaintext => DeserializedV1IdentityKind::Plaintext,
+            DeserializedV1Identity::Decrypted => DeserializedV1IdentityKind::Decrypted,
+        }
+    }
+}
+
+/// Handle to a deserialized V1 section
+#[repr(C)]
+pub struct DeserializedV1Section {
+    legible_sections_handle: LegibleV1Sections,
+    legible_section_index: u8,
+    num_des: u8,
+    identity_tag: DeserializedV1IdentityKind,
+}
+
+impl DeserializedV1Section {
+    /// Gets the number of data elements contained in this section.
+    /// Suitable as an iteration bound on `Self::get_de`.
+    pub fn num_des(&self) -> u8 {
+        self.num_des
+    }
+
+    /// Gets the enum tag of the identity employed by this deserialized section.
+    pub fn identity_kind(&self) -> DeserializedV1IdentityKind {
+        self.identity_tag
+    }
+
+    /// Gets the DE with the given index in this section.
+    pub fn get_de(&self, de_index: u8) -> GetV1DEResult {
+        // TODO: Once the `FromResidual` trait is stabilized, this can be simplified.
+        match self.legible_sections_handle.get() {
+            Ok(legible_sections_read_guard) => {
+                match legible_sections_read_guard.get_section_internals(self.legible_section_index)
+                {
+                    Some(section_ref) => section_ref.get_de(de_index),
+                    None => GetV1DEResult::Error,
+                }
+            }
+            Err(_) => GetV1DEResult::Error,
+        }
+    }
+}
+
+/// Discriminant for the `GetV1DEResult` enum.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum GetV1DEResultKind {
+    /// Attempting to get the DE at the given position failed,
+    /// possibly due to the index being out-of-bounds or due
+    /// to the whole advertisement having been previously deallocated.
+    Error = 0,
+    /// Attempting to get the DE at the given position succeeded.
+    /// The underlying DE may be extracted with `GetV1DEResult#into_success`.
+    Success = 1,
+}
+
+/// Represents the result of the `DeserializedV1Section#get_de` operation.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum GetV1DEResult {
+    Error,
+    Success(V1DataElement),
+}
+
+impl FfiEnum for GetV1DEResult {
+    type Kind = GetV1DEResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            GetV1DEResult::Error => GetV1DEResultKind::Error,
+            GetV1DEResult::Success(_) => GetV1DEResultKind::Success,
+        }
+    }
+}
+
+impl GetV1DEResult {
+    declare_enum_cast! {into_success, Success, V1DataElement}
+}
+
+/// FFI-transmissible representation of a V1 data-element
+#[derive(Clone)]
+#[repr(C)]
+pub enum V1DataElement {
+    /// A "generic" V1 data-element, for which we have no
+    /// particular information about its schema (just
+    /// a DE type code and a byte payload.)
+    Generic(GenericV1DataElement),
+}
+
+impl V1DataElement {
+    // Note: not using declare_enum_cast! for this one, because if V1DataElement
+    // gets more variants, this will have a different internal implementation
+    /// Converts a `V1DataElement` to a `GenericV1DataElement` which
+    /// only maintains information about the DE's type-code and payload.
+    pub fn to_generic(self) -> GenericV1DataElement {
+        match self {
+            V1DataElement::Generic(x) => x,
+        }
+    }
+}
+
+impl<'a> From<np_adv::extended::deserialize::DataElement<'a>> for V1DataElement {
+    fn from(de: np_adv::extended::deserialize::DataElement<'a>) -> Self {
+        let de_type = V1DEType::from(de.de_type());
+        let contents_as_slice = de.contents();
+        //Guaranteed not to panic due DE size limit.
+        #[allow(clippy::unwrap_used)]
+        let array_view: ArrayView<u8, 127> = ArrayView::try_from_slice(contents_as_slice).unwrap();
+        let payload = ByteBuffer::from_array_view(array_view);
+        Self::Generic(GenericV1DataElement { de_type, payload })
+    }
+}
+
+/// FFI-transmissible representation of a generic V1 data-element.
+/// This representation is stable, and so you may directly
+/// reference this struct's fields if you wish.
+#[derive(Clone)]
+#[repr(C)]
+pub struct GenericV1DataElement {
+    /// The DE type code of this generic data-element.
+    pub de_type: V1DEType,
+    /// The raw data-element byte payload, up to
+    /// 127 bytes in length.
+    pub payload: ByteBuffer<127>,
+}
+
+impl GenericV1DataElement {
+    /// Gets the DE-type of this generic V1 data element.
+    pub fn de_type(&self) -> V1DEType {
+        self.de_type
+    }
+    /// Destructures this `GenericV1DataElement` into just the
+    /// DE payload byte-buffer.
+    pub fn into_payload(self) -> ByteBuffer<127> {
+        self.payload
+    }
+}
+
+/// Representation of the data-element type tag
+/// of a V1 data element.
+#[derive(Clone, Copy)]
+#[repr(C)]
+pub struct V1DEType {
+    code: u32,
+}
+
+impl From<np_adv::extended::de_type::DeType> for V1DEType {
+    fn from(de_type: np_adv::extended::de_type::DeType) -> Self {
+        let code = de_type.as_u32();
+        Self { code }
+    }
+}
+
+impl V1DEType {
+    /// Yields this V1 DE type code as a u32.
+    pub fn to_u32(&self) -> u32 {
+        self.code
+    }
+}
diff --git a/nearby/presence/np_ffi_core/src/lib.rs b/nearby/presence/np_ffi_core/src/lib.rs
new file mode 100644
index 0000000..dd9e49e
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/lib.rs
@@ -0,0 +1,32 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Core functionality common to all NP Rust FFI layers
+#![cfg_attr(not(feature = "std"), no_std)]
+#![forbid(unsafe_code)]
+#![deny(
+    missing_docs,
+    clippy::indexing_slicing,
+    clippy::unwrap_used,
+    clippy::panic,
+    clippy::expect_used
+)]
+
+extern crate alloc;
+extern crate core;
+
+#[macro_use]
+pub mod utils;
+pub mod common;
+pub mod credentials;
+pub mod deserialize;
diff --git a/nearby/presence/np_ffi_core/src/utils.rs b/nearby/presence/np_ffi_core/src/utils.rs
new file mode 100644
index 0000000..e547a89
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/utils.rs
@@ -0,0 +1,51 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//! Common utilities used by other modules within this crate.
+
+use handle_map::HandleLike;
+
+/// Type-level predicate for handle types which uniformly hold a lock
+/// for longer than some other handle type in API calls.
+pub(crate) trait LocksLongerThan<H: HandleLike>: HandleLike {}
+
+/// Trait which canonicalizes the relationship between FFI
+/// tagged-unions and their tags
+pub trait FfiEnum {
+    /// The [FFI-safe] type of tags used to identify
+    /// variants of this tagged union.
+    type Kind;
+
+    /// Returns the tag for this FFI-safe tagged union.
+    fn kind(&self) -> Self::Kind;
+}
+
+/// Declares a method of the given name which attempts to cast
+/// the enclosing enum to the payload held under the given
+/// variant name, yielding a result of the given type wrapped
+/// in an `Option::Some`.
+///
+/// If the enclosing enum turns out to not be the requested
+/// variant, the generated method will return `None`.
+macro_rules! declare_enum_cast {
+    ($projection_method_name:ident, $variant_enum_name:ident, $variant_type_name:ty) => {
+        #[doc = concat!("Attempts to cast `self` to the `", stringify!($variant_enum_name),
+          "` variant, returning `None` in the \ncase where the passed value is of a different enum variant.")]
+        pub fn $projection_method_name(self) -> Option<$variant_type_name> {
+            match self {
+                Self::$variant_enum_name(x) => Some(x),
+                _ => None,
+            }
+        }
+    }
+}
diff --git a/nearby/presence/sink/Cargo.toml b/nearby/presence/sink/Cargo.toml
new file mode 100644
index 0000000..a0322b6
--- /dev/null
+++ b/nearby/presence/sink/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "sink"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+tinyvec.workspace = true
+
+[features]
+std = []
+
diff --git a/nearby/presence/sink/src/lib.rs b/nearby/presence/sink/src/lib.rs
new file mode 100644
index 0000000..75c7c1d
--- /dev/null
+++ b/nearby/presence/sink/src/lib.rs
@@ -0,0 +1,91 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! A no_std-friendly data-writing "sink" trait which allows for convenient expression
+//! of "write me into a limited-size buffer"-type methods on traits.
+#![cfg_attr(not(feature = "std"), no_std)]
+#![forbid(unsafe_code)]
+#![deny(
+    missing_docs,
+    clippy::indexing_slicing,
+    clippy::unwrap_used,
+    clippy::panic,
+    clippy::expect_used
+)]
+
+/// An append-only, limited-size collection.
+pub trait Sink<T> {
+    /// Returns `Some` if the slice was appended, `None` otherwise, in which case nothing was written
+    fn try_extend_from_slice(&mut self, items: &[T]) -> Option<()>;
+
+    /// Returns `Some` if the item could be pushed, `None` otherwise
+    fn try_push(&mut self, item: T) -> Option<()>;
+
+    /// Uses the given [`SinkWriter`] to write to this sink.
+    fn try_extend_from_writer<W: SinkWriter<DataType = T>>(&mut self, writer: W) -> Option<()>
+    where
+        Self: Sized,
+    {
+        writer.write_payload(self)
+    }
+}
+
+/// A use-once trait (like `FnOnce`) which represents some
+/// code which writes data to a [`Sink`].
+pub trait SinkWriter {
+    /// The type of data being written to the [`Sink`].
+    type DataType;
+
+    /// Returns `Some` if all data was successfully written to the [`Sink`],
+    /// but if doing so failed at any point, returns `None`. If this method
+    /// fails, the contents of the [`Sink`] should be considered to be invalid.
+    fn write_payload<S: Sink<Self::DataType> + ?Sized>(self, sink: &mut S) -> Option<()>;
+}
+
+impl<T, A> Sink<T> for tinyvec::ArrayVec<A>
+where
+    A: tinyvec::Array<Item = T>,
+    T: Clone,
+{
+    fn try_extend_from_slice(&mut self, items: &[T]) -> Option<()> {
+        if items.len() > (self.capacity() - self.len()) {
+            return None;
+        }
+        // won't panic: just checked the length
+        self.extend_from_slice(items);
+        Some(())
+    }
+
+    fn try_push(&mut self, item: T) -> Option<()> {
+        // tinyvec uses None to indicate success, whereas for our limited purposes we want the
+        // opposite
+        match tinyvec::ArrayVec::try_push(self, item) {
+            None => Some(()),
+            Some(_) => None,
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl<T: Clone> Sink<T> for std::vec::Vec<T> {
+    fn try_extend_from_slice(&mut self, items: &[T]) -> Option<()> {
+        self.extend_from_slice(items);
+        Some(())
+    }
+
+    fn try_push(&mut self, item: T) -> Option<()> {
+        self.push(item);
+        Some(())
+    }
+}
diff --git a/nearby/presence/xts_aes/fuzz/Cargo.lock b/nearby/presence/xts_aes/fuzz/Cargo.lock
index 2bdaef3..f0b7f56 100644
--- a/nearby/presence/xts_aes/fuzz/Cargo.lock
+++ b/nearby/presence/xts_aes/fuzz/Cargo.lock
@@ -4,9 +4,9 @@
 
 [[package]]
 name = "aead"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c192eb8f11fc081b0fe4259ba5af04217d4e0faddd02417310a927911abd7c8"
+checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
 dependencies = [
  "bytes",
  "crypto-common",
@@ -15,9 +15,9 @@
 
 [[package]]
 name = "aes"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433cfd6710c9986c576a25ca913c39d66a6474107b406f34f91d4a8923395241"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
 dependencies = [
  "cfg-if",
  "cipher",
@@ -69,9 +69,9 @@
 
 [[package]]
 name = "block-padding"
-version = "0.3.2"
+version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a90ec2df9600c28a01c56c4784c9207a96d2451833aeceb8cc97e4c9548bb78"
+checksum = "a8894febbff9f758034a5b8e12d87918f56dfc64a8e1fe757d65e29041538d93"
 dependencies = [
  "generic-array",
 ]
@@ -118,24 +118,24 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.5"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28d997bd5e24a5928dd43e46dc529867e207907fe0b239c3477d924f7f2ca320"
+checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c2538c4e68e52548bacb3e83ac549f903d44f011ac9d5abb5e132e67d0808f7"
+checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -193,23 +193,36 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-rc.2"
+version = "4.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
+checksum = "436ace70fc06e06f7f689d2624dc4e2f0ea666efb5aa704215f7249ae6e047a7"
 dependencies = [
  "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
  "digest",
  "fiat-crypto",
- "packed_simd_2",
  "platforms",
+ "rustc_version",
  "subtle",
 ]
 
 [[package]]
-name = "der"
-version = "0.7.1"
+name = "curve25519-dalek-derive"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc906908ea6458456e5eaa160a9c08543ec3d1e6f71e2235cedd660cb65f9df0"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "der"
+version = "0.7.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -217,9 +230,9 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3cdeb9ec472d588e539a818b2dee436825730da08ad0017c4b1a17676bdc8b7"
+checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -228,9 +241,9 @@
 
 [[package]]
 name = "digest"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8168378f4e5023e7218c89c891c0fd8ecdb5e5e4f18cb78f38cf245dd021e76f"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
@@ -248,9 +261,9 @@
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "798f704d128510932661a3489b08e3f4c934a01d61c5def59ae7b8e48f19665a"
+checksum = "faa8e9049d5d72bfc12acbc05914731b5322f79b5e2f195e9f2d705fca22ab4c"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
@@ -260,9 +273,9 @@
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.2"
+version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ea5a92946e8614bb585254898bb7dd1ddad241ace60c52149e3765e34cc039d"
+checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -295,9 +308,9 @@
 
 [[package]]
 name = "generic-array"
-version = "0.14.6"
+version = "0.14.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bff49e947297f3312447abdca79f45f4738097cc82b06e72054d2223f601f1b9"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
 dependencies = [
  "typenum",
  "version_check",
@@ -306,9 +319,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.8"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "libc",
@@ -372,9 +385,9 @@
 
 [[package]]
 name = "libc"
-version = "0.2.140"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99227334921fae1a979cf0bfdfcc6b3e5ce376ef57e16fb6fb3ea2ed6095f80c"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "libfuzzer-sys"
@@ -388,16 +401,10 @@
 ]
 
 [[package]]
-name = "libm"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
-
-[[package]]
 name = "once_cell"
-version = "1.17.1"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "opaque-debug"
@@ -407,25 +414,15 @@
 
 [[package]]
 name = "p256"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7270da3e5caa82afd3deb054cc237905853813aea3859544bc082c3fe55b8d47"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
 dependencies = [
  "elliptic-curve",
  "primeorder",
 ]
 
 [[package]]
-name = "packed_simd_2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
-dependencies = [
- "cfg-if",
- "libm",
-]
-
-[[package]]
 name = "platforms"
 version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -433,9 +430,9 @@
 
 [[package]]
 name = "polyval"
-version = "0.6.0"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef234e08c11dfcb2e56f79fd70f6f2eb7f025c0ce2333e82f4f0518ecad30c6"
+checksum = "d52cff9d1d4dee5fe6d03729099f4a310a41179e0a10dbf542039873f2e826fb"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -451,27 +448,27 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.0"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7613fdcc0831c10060fa69833ea8fa2caa94b6456f51e25356a885b530a2e3d0"
+checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.53"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba466839c78239c09faf015484e5cc04860f88242cff4d03eb038f04b4699b73"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.26"
+version = "1.0.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
+checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
 dependencies = [
  "proc-macro2",
 ]
@@ -505,10 +502,19 @@
 ]
 
 [[package]]
-name = "sec1"
-version = "0.7.1"
+name = "rustc_version"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48518a2b5775ba8ca5b46596aae011caa431e6ce7e4a67ead66d92f08884220e"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "sec1"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
 dependencies = [
  "base16ct",
  "der",
@@ -518,10 +524,16 @@
 ]
 
 [[package]]
-name = "sha2"
-version = "0.10.6"
+name = "semver"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+
+[[package]]
+name = "sha2"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -536,15 +548,15 @@
 
 [[package]]
 name = "subtle"
-version = "2.4.1"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
 [[package]]
 name = "syn"
-version = "1.0.109"
+version = "2.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -559,15 +571,15 @@
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.8"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "universal-hash"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d3160b73c9a19f7e2939a2fdad446c57c1bbbbf4d919d3213ff1267a580d8b5"
+checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
 dependencies = [
  "crypto-common",
  "subtle",
@@ -587,9 +599,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0-rc.2"
+version = "2.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabd6e16dd08033932fc3265ad4510cc2eab24656058a6dcb107ffe274abcc95"
+checksum = "ec7fae07da688e17059d5886712c933bb0520f15eff2e09cfa18e30968f4e63a"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
@@ -618,6 +630,6 @@
 
 [[package]]
 name = "zeroize"
-version = "1.5.7"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c394b5bd0c6f669e7275d9c20aa90ae064cb22e75a1cad54e1b34088034b149f"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
diff --git a/nearby/src/ffi.rs b/nearby/src/ffi.rs
index e0efce5..44479be 100644
--- a/nearby/src/ffi.rs
+++ b/nearby/src/ffi.rs
@@ -15,8 +15,32 @@
 use crate::{run_cmd_shell, run_cmd_shell_with_color, YellowStderr};
 use std::{fs, path};
 
+// wrapper for checking all ffi related things
+pub fn check_everything(root: &path::Path) -> anyhow::Result<()> {
+    check_np_ffi(root)?;
+    check_ldt_ffi(root)?;
+    check_cmake_projects(root)?;
+
+    Ok(())
+}
+
+pub fn check_np_ffi(root: &path::Path) -> anyhow::Result<()> {
+    log::info!("Checking np_c_ffi cargo build");
+    let mut ffi_dir = root.to_path_buf();
+    ffi_dir.push("presence/np_c_ffi");
+    for cargo_cmd in [
+        "fmt --check",
+        // Default build, RustCrypto + no_std
+        "build --release",
+        "clippy --release",
+    ] {
+        run_cmd_shell(&ffi_dir, format!("cargo {}", cargo_cmd))?;
+    }
+    Ok(())
+}
+
 pub fn check_ldt_ffi(root: &path::Path) -> anyhow::Result<()> {
-    log::info!("Checking LDT ffi");
+    log::info!("Checking LFT ffi cargo build");
     let mut ffi_dir = root.to_path_buf();
     ffi_dir.push("presence/ldt_np_adv_ffi");
 
@@ -43,6 +67,11 @@
         run_cmd_shell(&ffi_dir, format!("cargo {}", cargo_cmd))?;
     }
 
+    Ok(())
+}
+
+pub fn check_cmake_projects(root: &path::Path) -> anyhow::Result<()> {
+    log::info!("Checking CMake build and tests (for ffi c/c++ code)");
     let mut build_dir = root.to_path_buf();
     build_dir.push("presence/cmake-build");
     fs::create_dir_all(&build_dir)?;
@@ -50,8 +79,18 @@
     run_cmd_shell_with_color::<YellowStderr>(&build_dir, "cmake .. -DENABLE_TESTS=true")?;
     run_cmd_shell_with_color::<YellowStderr>(&build_dir, "cmake --build .")?;
 
-    let mut tests_dir = build_dir;
-    tests_dir.push("ldt_np_c_sample/tests");
+    // run the np_cpp_ffi unit tests
+    let mut np_cpp_tests_dir = build_dir.clone();
+    np_cpp_tests_dir.push("np_cpp_ffi/tests");
+    run_cmd_shell_with_color::<YellowStderr>(&np_cpp_tests_dir, "ctest")?;
+
+    // Run the LDT ffi unit tests. These are rebuilt and tested against all of the different
+    // Cargo build configurations based on the feature flags.
+    let mut ldt_tests_dir = build_dir.clone();
+    ldt_tests_dir.push("ldt_np_c_sample/tests");
+
+    let mut ldt_ffi_crate_dir = root.to_path_buf();
+    ldt_ffi_crate_dir.push("presence/ldt_np_adv_ffi");
 
     for build_config in [
         // test with default build settings (rustcrypto, no_std)
@@ -65,9 +104,11 @@
         // test without defaults and std feature flag
         "build --no-default-features --features std --release",
     ] {
-        run_cmd_shell(&ffi_dir, format!("cargo {}", build_config))?;
-        run_cmd_shell_with_color::<YellowStderr>(&tests_dir, "cmake --build .")?;
-        run_cmd_shell_with_color::<YellowStderr>(&tests_dir, "ctest")?;
+        run_cmd_shell(&ldt_ffi_crate_dir, format!("cargo {}", build_config))?;
+        // Force detection of updated `ldt_np_adv_ffi` static lib
+        run_cmd_shell_with_color::<YellowStderr>(&build_dir, "rm -rf ldt_np_c_sample/tests/*")?;
+        run_cmd_shell_with_color::<YellowStderr>(&build_dir, "cmake --build .")?;
+        run_cmd_shell_with_color::<YellowStderr>(&ldt_tests_dir, "ctest")?;
     }
 
     Ok(())
diff --git a/nearby/src/license.rs b/nearby/src/license.rs
index fd9af83..657a62e 100644
--- a/nearby/src/license.rs
+++ b/nearby/src/license.rs
@@ -94,5 +94,10 @@
         "**/Session.vim",
         "**/*.properties",
         "**/third_party/**",
+        "**/*.png",
+        "**/*.ico",
+        "**/node_modules/**",
+        "**/.angular/**",
+        "**/.editorconfig",
     ]
 }
diff --git a/nearby/src/main.rs b/nearby/src/main.rs
index b7d002b..4c1104f 100644
--- a/nearby/src/main.rs
+++ b/nearby/src/main.rs
@@ -37,6 +37,11 @@
     );
 
     match cli.subcommand {
+        Subcommand::CheckEverything { ref check_options, ref bssl_options } => {
+            check_everything(&root_dir, check_options, bssl_options)?
+        }
+        Subcommand::CheckWorkspace(ref options) => check_workspace(&root_dir, options)?,
+        Subcommand::FfiCheckEverything => ffi::check_everything(&root_dir)?,
         Subcommand::BuildBoringssl(ref bssl_options) => {
             crypto_ffi::build_boringssl(&root_dir, bssl_options)?
         }
@@ -49,13 +54,11 @@
         Subcommand::BuildFfiFuzzers => fuzzers::build_ffi_fuzzers(&root_dir)?,
         Subcommand::CheckLicenseHeaders => license::check_license_headers(&root_dir)?,
         Subcommand::AddLicenseHeaders => license::add_license_headers(&root_dir)?,
-        Subcommand::CheckWorkspace(ref options) => check_workspace(&root_dir, options)?,
         Subcommand::CheckLdtFfi => ffi::check_ldt_ffi(&root_dir)?,
-        Subcommand::CheckEverything { ref check_options, ref bssl_options } => {
-            check_everything(&root_dir, check_options, bssl_options)?
-        }
         Subcommand::CheckUkey2Ffi => ukey2::check_ukey2_ffi(&root_dir)?,
         Subcommand::CheckLdtJni => jni::check_ldt_jni(&root_dir)?,
+        Subcommand::CheckNpFfi => ffi::check_np_ffi(&root_dir)?,
+        Subcommand::CheckCmakeProjects => ffi::check_cmake_projects(&root_dir)?,
     }
 
     Ok(())
@@ -95,7 +98,7 @@
     check_workspace(root, check_options)?;
     crypto_ffi::check_boringssl(root, bssl_options)?;
     crypto_ffi::check_openssl(root)?;
-    ffi::check_ldt_ffi(root)?;
+    ffi::check_everything(root)?;
     jni::check_ldt_jni(root)?;
     ukey2::check_ukey2_ffi(root)?;
     fuzzers::run_rust_fuzzers(root)?;
@@ -112,6 +115,15 @@
 
 #[derive(clap::Subcommand, Debug, Clone)]
 enum Subcommand {
+    /// Checks everything in beto-rust
+    CheckEverything {
+        #[command(flatten)]
+        check_options: CheckOptions,
+        #[command(flatten)]
+        bssl_options: BuildBoringSslOptions,
+    },
+    /// Checks everything included in the top level workspace
+    CheckWorkspace(CheckOptions),
     /// Clones boringssl and uses bindgen to generate the rust crate
     BuildBoringssl(BuildBoringSslOptions),
     /// Run crypto provider tests using boringssl backend
@@ -125,21 +137,19 @@
     RunRustFuzzers,
     /// Build FFI fuzzers
     BuildFfiFuzzers,
-    /// Builds and runs all tests for all combinations of features for the LDT FFI
+    /// Builds and runs tests for all C/C++ projects. This is a combination of CheckNpFfi,
+    /// CheckLdtFfi, and CheckCmakeBuildAndTests
+    FfiCheckEverything,
+    /// Builds the crate checks the cbindgen generation of C/C++ bindings
+    CheckNpFfi,
+    /// Builds ldt_np_adv_ffi crate with all possible different sets of feature flags
     CheckLdtFfi,
+    /// Checks the CMake build and runs all of the C/C++ tests
+    CheckCmakeProjects,
     /// Checks the workspace 3rd party crates and makes sure they have a valid license
     CheckLicenseHeaders,
     /// Generate new headers for any files that are missing them
     AddLicenseHeaders,
-    /// Checks everything included in the top level workspace
-    CheckWorkspace(CheckOptions),
-    /// Checks everything in beto-rust
-    CheckEverything {
-        #[command(flatten)]
-        check_options: CheckOptions,
-        #[command(flatten)]
-        bssl_options: BuildBoringSslOptions,
-    },
     /// Builds and runs tests for the UKEY2 FFI
     CheckUkey2Ffi,
     /// Checks the build of ldt_jni wrapper with non default features, ie rust-openssl, and boringssl
diff --git a/nearby/src/ukey2.rs b/nearby/src/ukey2.rs
index c54fbb3..f0e1081 100644
--- a/nearby/src/ukey2.rs
+++ b/nearby/src/ukey2.rs
@@ -34,7 +34,7 @@
     ffi_build_dir.push("cpp/build");
     fs::create_dir_all(&ffi_build_dir)?;
     run_cmd_shell_with_color::<YellowStderr>(&ffi_build_dir, "cmake ..")?;
-    run_cmd_shell_with_color::<YellowStderr>(&ffi_build_dir, "make all")?;
+    run_cmd_shell_with_color::<YellowStderr>(&ffi_build_dir, "cmake --build .")?;
     run_cmd_shell_with_color::<YellowStderr>(&ffi_build_dir, "ctest")?;
 
     Ok(())