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beto-core/beto-core/bd1f1272cd2a6605ec793b914ada2c4ebcc820f6^!/.
commit
bd1f1272cd2a6605ec793b914ada2c4ebcc820f6
[log] [tgz]
author
Better Together Rust Devs <no-reply@google.com>
Fri Feb 23 03:49:54 2024 +0000
committer
Anay Wadhera <awadhera@google.com>
Mon Feb 26 16:27:11 2024 +0000
tree
e4be78acde8f1ca995be8dc1fabceaab308b670f
parent
4d202dab960a0b6a6e4757ab4393945aca5a09db [diff]
Project import generated by Copybara.

GitOrigin-RevId: ff7f011e248298e524dcbf6e4177114052b284f7
Change-Id: I631bd0d1a9736e80966d2abe6511eed7a270a2a5

diff --git a/.gitmodules b/.gitmodules
index 937bff2..ed737f5 100644
--- a/.gitmodules
+++ b/.gitmodules

@@ -7,3 +7,6 @@
 [submodule "third_party/boringssl"]
 	path = third_party/boringssl
 	url = https://boringssl.googlesource.com/boringssl
+[submodule "third_party/fuzztest"]
+	path = third_party/fuzztest
+	url = https://github.com/google/fuzztest.git

diff --git a/nearby/.cargo/config-boringssl.toml b/nearby/.cargo/config-boringssl.toml
deleted file mode 100644
index 2bde6df..0000000
--- a/nearby/.cargo/config-boringssl.toml
+++ /dev/null

@@ -1,9 +0,0 @@
-# The packages to override
-paths = [
-    "../third_party/boringssl/rust/bssl-sys",
-    "../boringssl-build/rust-openssl/openssl",
-    "../boringssl-build/rust-openssl/openssl-sys",
-]
-
-[env]
-WORKSPACE_DIR = { value = "", relative = true }

diff --git a/nearby/Cargo.lock b/nearby/Cargo.lock
index 813de5f..46d9066 100644
--- a/nearby/Cargo.lock
+++ b/nearby/Cargo.lock

@@ -69,12 +69,6 @@
 ]
 
 [[package]]
-name = "aliasable"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "250f629c0161ad8107cf89319e990051fae62832fd343083bea452d93e2205fd"
-
-[[package]]
 name = "android-tzdata"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -97,16 +91,15 @@
 
 [[package]]
 name = "anstream"
-version = "0.3.2"
+version = "0.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ca84f3628370c59db74ee214b3263d58f9aadd9b4fe7e711fd87dc452b7f163"
+checksum = "96b09b5178381e0874812a9b157f7fe84982617e48f71f4e3235482775e5b540"
 dependencies = [
  "anstyle",
  "anstyle-parse",
  "anstyle-query",
  "anstyle-wincon",
  "colorchoice",
- "is-terminal",
  "utf8parse",
 ]
 
@@ -136,19 +129,19 @@
 
 [[package]]
 name = "anstyle-wincon"
-version = "1.0.1"
+version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "180abfa45703aebe0093f79badacc01b8fd4ea2e35118747e5811127f926e188"
+checksum = "1cd54b81ec8d6180e24654d0b371ad22fc3dd083b6ff8ba325b72e00c87660a7"
 dependencies = [
  "anstyle",
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
 name = "anyhow"
-version = "1.0.72"
+version = "1.0.80"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b13c32d80ecc7ab747b80c3784bce54ee8a7a0cc4fbda9bf4cda2cf6fe90854"
+checksum = "5ad32ce52e4161730f7098c077cd2ed6229b5804ccf99e5366be1ab72a98b4e1"
 
 [[package]]
 name = "array_ref"
@@ -183,15 +176,9 @@
 
 [[package]]
 name = "base64"
-version = "0.13.1"
+version = "0.21.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
-
-[[package]]
-name = "base64"
-version = "0.21.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "604178f6c5c21f02dc555784810edfb88d34ac2c73b2eae109655649ee73ce3d"
+checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
 
 [[package]]
 name = "base64ct"
@@ -207,9 +194,9 @@
 
 [[package]]
 name = "bitflags"
-version = "2.3.3"
+version = "2.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "630be753d4e58660abd17930c71b647fe46c27ea6b63cc59e1e3851406972e42"
+checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
 
 [[package]]
 name = "blake2"
@@ -240,9 +227,9 @@
 
 [[package]]
 name = "bssl-crypto"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
- "bssl-sys 0.1.0",
+ "bssl-sys",
 ]
 
 [[package]]
@@ -250,12 +237,6 @@
 version = "0.1.0"
 
 [[package]]
-name = "bssl-sys"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "312d12393c060384f2e6ed14c7b4be37b3dd90249857485613c1a91b9a1abb5c"
-
-[[package]]
 name = "bstr"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -271,11 +252,12 @@
 dependencies = [
  "anyhow",
  "chrono",
- "clap 4.3.19",
+ "clap 4.5.1",
  "cmd-runner",
  "crossbeam",
  "env_logger",
  "file-header",
+ "glob",
  "globset",
  "log",
  "owo-colors",
@@ -303,9 +285,9 @@
 
 [[package]]
 name = "bytes"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "cast"
@@ -323,6 +305,25 @@
 ]
 
 [[package]]
+name = "cbindgen"
+version = "0.26.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da6bc11b07529f16944307272d5bd9b22530bc7d05751717c9d416586cedab49"
+dependencies = [
+ "clap 3.2.25",
+ "heck",
+ "indexmap",
+ "log",
+ "proc-macro2",
+ "quote",
+ "serde",
+ "serde_json",
+ "syn 1.0.109",
+ "tempfile",
+ "toml",
+]
+
+[[package]]
 name = "cc"
 version = "1.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -342,14 +343,14 @@
 
 [[package]]
 name = "chrono"
-version = "0.4.26"
+version = "0.4.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec837a71355b28f6556dbd569b37b3f363091c0bd4b2e735674521b4c5fd9bc5"
+checksum = "5bc015644b92d5890fab7489e49d21f879d5c990186827d42ec511919404f38b"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
  "num-traits",
- "winapi",
+ "windows-targets 0.52.3",
 ]
 
 [[package]]
@@ -395,45 +396,47 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
 dependencies = [
+ "atty",
  "bitflags 1.3.2",
  "clap_lex 0.2.4",
  "indexmap",
+ "strsim 0.10.0",
+ "termcolor",
  "textwrap",
 ]
 
 [[package]]
 name = "clap"
-version = "4.3.19"
+version = "4.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fd304a20bff958a57f04c4e96a2e7594cc4490a0e809cbd48bb6437edaa452d"
+checksum = "c918d541ef2913577a0f9566e9ce27cb35b6df072075769e0b26cb5a554520da"
 dependencies = [
  "clap_builder",
  "clap_derive",
- "once_cell",
 ]
 
 [[package]]
 name = "clap_builder"
-version = "4.3.19"
+version = "4.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01c6a3f08f1fe5662a35cfe393aec09c4df95f60ee93b7556505260f75eee9e1"
+checksum = "9f3e7391dad68afb0c2ede1bf619f579a3dc9c2ec67f089baa397123a2f3d1eb"
 dependencies = [
  "anstream",
  "anstyle",
- "clap_lex 0.5.0",
- "strsim",
+ "clap_lex 0.7.0",
+ "strsim 0.11.0",
 ]
 
 [[package]]
 name = "clap_derive"
-version = "4.3.12"
+version = "4.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "54a9bb5758fc5dfe728d1019941681eccaf0cf8a4189b692a0ee2f2ecf90a050"
+checksum = "307bc0538d5f0f83b8248db3087aa92fe504e4691294d0c96c0eabc33f47ba47"
 dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.28",
+ "syn 2.0.50",
 ]
 
 [[package]]
@@ -447,9 +450,9 @@
 
 [[package]]
 name = "clap_lex"
-version = "0.5.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2da6da31387c7e4ef160ffab6d5e7f00c42626fe39aea70a7b0f1773f7dd6c1b"
+checksum = "98cc8fbded0c607b7ba9dd60cd98df59af97e84d24e49c8557331cfc26d301ce"
 
 [[package]]
 name = "cmd-runner"
@@ -477,10 +480,6 @@
 ]
 
 [[package]]
-name = "connections_adv"
-version = "0.1.0"
-
-[[package]]
 name = "const-oid"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -512,19 +511,19 @@
 
 [[package]]
 name = "criterion"
-version = "0.4.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7c76e09c1aae2bc52b3d2f29e13c6572553b30c4aa1b8a49fd70de6412654cb"
+checksum = "f2b12d017a929603d80db1831cd3a24082f8137ce19c69e6447f54f5fc8d692f"
 dependencies = [
  "anes",
- "atty",
  "cast",
  "ciborium",
- "clap 3.2.25",
+ "clap 4.5.1",
  "criterion-plot",
+ "is-terminal",
  "itertools",
- "lazy_static",
  "num-traits",
+ "once_cell",
  "oorandom",
  "plotters",
  "rayon",
@@ -641,8 +640,7 @@
 version = "0.1.0"
 dependencies = [
  "criterion",
- "crypto_provider_openssl",
- "crypto_provider_rustcrypto",
+ "crypto_provider_default",
  "hex-literal",
  "rand",
  "rand_ext",
@@ -664,25 +662,10 @@
  "cfg-if",
  "crypto_provider",
  "crypto_provider_boringssl",
- "crypto_provider_openssl",
  "crypto_provider_rustcrypto",
 ]
 
 [[package]]
-name = "crypto_provider_openssl"
-version = "0.1.0"
-dependencies = [
- "cfg-if",
- "crypto_provider",
- "crypto_provider_stubs",
- "crypto_provider_test",
- "hex-literal",
- "openssl",
- "ouroboros",
- "rstest",
-]
-
-[[package]]
 name = "crypto_provider_rustcrypto"
 version = "0.1.0"
 dependencies = [
@@ -766,7 +749,7 @@
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.28",
+ "syn 2.0.50",
 ]
 
 [[package]]
@@ -808,15 +791,16 @@
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+checksum = "4a3daa8e81a3963a60642bcc1f90a670680bd4a77535faa384e9d1c79d620871"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
  "rand_core 0.6.4",
  "serde",
  "sha2",
+ "subtle",
  "zeroize",
 ]
 
@@ -847,9 +831,9 @@
 
 [[package]]
 name = "env_logger"
-version = "0.10.0"
+version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85cdab6a89accf66733ad5a1693a4dcced6aeff64602b634530dd73c1f3ee9f0"
+checksum = "4cd405aab171cb85d6735e5c8d9db038c17d3ca007a4d2c25f337935c3d90580"
 dependencies = [
  "humantime",
  "is-terminal",
@@ -860,30 +844,19 @@
 
 [[package]]
 name = "errno"
-version = "0.3.2"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b30f669a7961ef1631673d2766cc92f52d64f7ef354d4fe0ddfd30ed52f0f4f"
+checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
 dependencies = [
- "errno-dragonfly",
  "libc",
- "windows-sys 0.48.0",
-]
-
-[[package]]
-name = "errno-dragonfly"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa68f1b12764fab894d2755d2518754e71b4fd80ecfb822714a1206c2aab39bf"
-dependencies = [
- "cc",
- "libc",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
 name = "fastrand"
-version = "2.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6999dc1837253364c2ebb0704ba97994bd874e8f195d665c50b7548f6ea92764"
+checksum = "25cbce373ec4653f1a01a31e8a5e5ec0c622dc27ff9c4e6606eefef5cbbed4a5"
 
 [[package]]
 name = "ff"
@@ -931,21 +904,6 @@
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
-name = "foreign-types"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
-dependencies = [
- "foreign-types-shared",
-]
-
-[[package]]
-name = "foreign-types-shared"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
-
-[[package]]
 name = "generic-array"
 version = "0.14.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -978,6 +936,12 @@
 ]
 
 [[package]]
+name = "glob"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"
+
+[[package]]
 name = "globset"
 version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1024,11 +988,11 @@
 
 [[package]]
 name = "hdrhistogram"
-version = "7.5.2"
+version = "7.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f19b9f54f7c7f55e31401bb647626ce0cf0f67b0004982ce815b3ee72a02aa8"
+checksum = "765c9198f173dd59ce26ff9f95ef0aafd0a0fe01fb9d72841bc5066a4c06511d"
 dependencies = [
- "base64 0.13.1",
+ "base64",
  "byteorder",
  "crossbeam-channel",
  "flate2",
@@ -1163,6 +1127,16 @@
 checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
+name = "java-locator"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90003f2fd9c52f212c21d8520f1128da0080bad6fff16b68fe6e7f2f0c3780c2"
+dependencies = [
+ "glob",
+ "lazy_static",
+]
+
+[[package]]
 name = "jni"
 version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1171,7 +1145,9 @@
  "cesu8",
  "cfg-if",
  "combine",
+ "java-locator",
  "jni-sys",
+ "libloading",
  "log",
  "thiserror",
  "walkdir",
@@ -1208,9 +1184,9 @@
 dependencies = [
  "aes",
  "anyhow",
- "base64 0.21.2",
+ "base64",
  "blake2",
- "clap 4.3.19",
+ "clap 4.5.1",
  "criterion",
  "crypto_provider",
  "crypto_provider_default",
@@ -1235,11 +1211,10 @@
 dependencies = [
  "anyhow",
  "array_view",
- "base64 0.21.2",
+ "base64",
  "criterion",
  "crypto_provider",
  "crypto_provider_default",
- "crypto_provider_openssl",
  "crypto_provider_rustcrypto",
  "hex",
  "ldt",
@@ -1254,6 +1229,21 @@
 ]
 
 [[package]]
+name = "ldt_np_adv_ffi"
+version = "0.1.0"
+dependencies = [
+ "cfg-if",
+ "crypto_provider",
+ "crypto_provider_default",
+ "lazy_static",
+ "ldt",
+ "ldt_np_adv",
+ "np_hkdf",
+ "rand",
+ "spin 0.9.8",
+]
+
+[[package]]
 name = "ldt_np_jni"
 version = "0.1.0"
 dependencies = [
@@ -1275,9 +1265,19 @@
 
 [[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
+
+[[package]]
+name = "libloading"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b67380fd3b2fbe7527a606e18729d21c6f3951633d0500574c4dc22d2d638b9f"
+dependencies = [
+ "cfg-if",
+ "winapi",
+]
 
 [[package]]
 name = "license"
@@ -1292,9 +1292,9 @@
 
 [[package]]
 name = "linux-raw-sys"
-version = "0.4.3"
+version = "0.4.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09fc20d2ca12cb9f044c93e3bd6d32d523e6e2ec3db4f7b2939cd99026ecd3f0"
+checksum = "01cda141df6706de531b6c46c3a33ecca755538219bd484262fa09410c13539c"
 
 [[package]]
 name = "lock_adapter"
@@ -1315,9 +1315,9 @@
 
 [[package]]
 name = "log"
-version = "0.4.19"
+version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b06a4cde4c0f271a446782e3eff8de789548ce57dbc8eca9292c27f4a42004b4"
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "memchr"
@@ -1399,6 +1399,15 @@
 ]
 
 [[package]]
+name = "np_c_ffi"
+version = "0.1.0"
+dependencies = [
+ "cbindgen",
+ "lock_adapter",
+ "np_ffi_core",
+]
+
+[[package]]
 name = "np_ed25519"
 version = "0.1.0"
 dependencies = [
@@ -1420,6 +1429,7 @@
  "ldt_np_adv",
  "lock_adapter",
  "np_adv",
+ "np_adv_dynamic",
  "np_hkdf",
 ]
 
@@ -1442,9 +1452,9 @@
 
 [[package]]
 name = "num-bigint"
-version = "0.4.3"
+version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
+checksum = "608e7659b5c3d7cba262d894801b9ec9d00de989e8a82bd4bef91d08da45cdc0"
 dependencies = [
  "autocfg",
  "num-integer",
@@ -1499,75 +1509,12 @@
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
 [[package]]
-name = "openssl"
-version = "0.10.55"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "bitflags 1.3.2",
- "cfg-if",
- "foreign-types",
- "libc",
- "once_cell",
- "openssl-macros",
- "openssl-sys",
-]
-
-[[package]]
-name = "openssl-macros"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.28",
-]
-
-[[package]]
-name = "openssl-sys"
-version = "0.9.90"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "374533b0e45f3a7ced10fcaeccca020e66656bc03dac384f852e4e5a7a8104a6"
-dependencies = [
- "bssl-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc",
- "libc",
- "pkg-config",
- "vcpkg",
-]
-
-[[package]]
 name = "os_str_bytes"
 version = "6.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d5d9eb14b174ee9aa2ef96dc2b94637a2d4b6e7cb873c7e171f0c20c6cf3eac"
 
 [[package]]
-name = "ouroboros"
-version = "0.17.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2ba07320d39dfea882faa70554b4bd342a5f273ed59ba7c1c6b4c840492c954"
-dependencies = [
- "aliasable",
- "ouroboros_macro",
- "static_assertions",
-]
-
-[[package]]
-name = "ouroboros_macro"
-version = "0.17.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec4c6225c69b4ca778c0aea097321a64c421cf4577b331c61b229267edabb6f8"
-dependencies = [
- "heck",
- "proc-macro-error",
- "proc-macro2",
- "quote",
- "syn 2.0.28",
-]
-
-[[package]]
 name = "owo-colors"
 version = "3.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1594,12 +1541,6 @@
 ]
 
 [[package]]
-name = "pkg-config"
-version = "0.3.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
-
-[[package]]
 name = "platforms"
 version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1646,6 +1587,30 @@
 ]
 
 [[package]]
+name = "pourover"
+version = "0.1.0"
+dependencies = [
+ "jni",
+ "pourover_macro",
+]
+
+[[package]]
+name = "pourover_macro"
+version = "0.1.0"
+dependencies = [
+ "pourover_macro_core",
+]
+
+[[package]]
+name = "pourover_macro_core"
+version = "0.1.0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.50",
+]
+
+[[package]]
 name = "ppv-lite86"
 version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1661,34 +1626,10 @@
 ]
 
 [[package]]
-name = "proc-macro-error"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
-dependencies = [
- "proc-macro-error-attr",
- "proc-macro2",
- "quote",
- "syn 1.0.109",
- "version_check",
-]
-
-[[package]]
-name = "proc-macro-error-attr"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
-dependencies = [
- "proc-macro2",
- "quote",
- "version_check",
-]
-
-[[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
@@ -1746,9 +1687,9 @@
 
 [[package]]
 name = "quote"
-version = "1.0.32"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50f3b39ccfb720540debaa0164757101c08ecb8d326b15358ce76a62c7e85965"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -1839,15 +1780,6 @@
 ]
 
 [[package]]
-name = "redox_syscall"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
-dependencies = [
- "bitflags 1.3.2",
-]
-
-[[package]]
 name = "regex"
 version = "1.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1877,6 +1809,12 @@
 checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
 
 [[package]]
+name = "relative-path"
+version = "1.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e898588f33fdd5b9420719948f9f2a32c922a246964576f71ba7f24f80610fbc"
+
+[[package]]
 name = "reword"
 version = "7.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1887,9 +1825,9 @@
 
 [[package]]
 name = "rstest"
-version = "0.17.0"
+version = "0.18.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de1bb486a691878cd320c2f0d319ba91eeaa2e894066d8b5f8f117c000e9d962"
+checksum = "97eeab2f3c0a199bc4be135c36c924b6590b88c377d416494288c14f2db30199"
 dependencies = [
  "rstest_macros",
  "rustc_version",
@@ -1897,15 +1835,18 @@
 
 [[package]]
 name = "rstest_macros"
-version = "0.17.0"
+version = "0.18.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "290ca1a1c8ca7edb7c3283bd44dc35dd54fdec6253a3912e201ba1072018fca8"
+checksum = "d428f8247852f894ee1be110b375111b586d4fa431f6c46e64ba5a0dcccbe605"
 dependencies = [
  "cfg-if",
+ "glob",
  "proc-macro2",
  "quote",
+ "regex",
+ "relative-path",
  "rustc_version",
- "syn 1.0.109",
+ "syn 2.0.50",
  "unicode-ident",
 ]
 
@@ -1918,7 +1859,7 @@
  "quote",
  "rand",
  "rustc_version",
- "syn 2.0.28",
+ "syn 2.0.50",
 ]
 
 [[package]]
@@ -1932,15 +1873,15 @@
 
 [[package]]
 name = "rustix"
-version = "0.38.4"
+version = "0.38.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a962918ea88d644592894bc6dc55acc6c0956488adcebbfb6e273506b7fd6e5"
+checksum = "6ea3e1a662af26cd7a3ba09c0297a31af215563ecf42817c98df621387f4e949"
 dependencies = [
- "bitflags 2.3.3",
+ "bitflags 2.4.2",
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1991,29 +1932,29 @@
 
 [[package]]
 name = "serde"
-version = "1.0.192"
+version = "1.0.197"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
+checksum = "3fb1c873e1b9b056a4dc4c0c198b24c3ffa059243875552b2bd0933b1aee4ce2"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.192"
+version = "1.0.197"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
+checksum = "7eb0b34b42edc17f6b7cac84a52a1c5f0e1bb2227e997ca9011ea3dd34e8610b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.28",
+ "syn 2.0.50",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.104"
+version = "1.0.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "076066c5f1078eac5b722a31827a8832fe108bed65dfa75e233c89f8206e976c"
+checksum = "c5f09b1bd632ef549eaa9f60a1f8de742bdbc698e6cee2095fc84dde5f549ae0"
 dependencies = [
  "itoa",
  "ryu",
@@ -2022,9 +1963,9 @@
 
 [[package]]
 name = "sha2"
-version = "0.10.7"
+version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -2076,18 +2017,18 @@
 ]
 
 [[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 = "strsim"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ee073c9e4cd00e28217186dbe12796d692868f432bf2e97ee73bed0c56dfa01"
+
+[[package]]
 name = "strum"
 version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2103,7 +2044,7 @@
  "proc-macro2",
  "quote",
  "rustversion",
- "syn 2.0.28",
+ "syn 2.0.50",
 ]
 
 [[package]]
@@ -2125,9 +2066,9 @@
 
 [[package]]
 name = "syn"
-version = "2.0.28"
+version = "2.0.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04361975b3f5e348b2189d8dc55bc942f278b2d482a6a0365de5bdd62d351567"
+checksum = "74f1bdc9872430ce9b75da68329d1c1746faf50ffac5f19e02b71e37ff881ffb"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2136,15 +2077,14 @@
 
 [[package]]
 name = "tempfile"
-version = "3.7.0"
+version = "3.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5486094ee78b2e5038a6382ed7645bc084dc2ec433426ca4c3cb61e2007b8998"
+checksum = "a365e8cd18e44762ef95d87f284f4b5cd04107fec2ff3052bd6a3e6069669e67"
 dependencies = [
  "cfg-if",
  "fastrand",
- "redox_syscall",
  "rustix",
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -2172,22 +2112,22 @@
 
 [[package]]
 name = "thiserror"
-version = "1.0.44"
+version = "1.0.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "611040a08a0439f8248d1990b111c95baa9c704c805fa1f62104b39655fd7f90"
+checksum = "1e45bcbe8ed29775f228095caf2cd67af7a4ccf756ebff23a306bf3e8b47b24b"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.44"
+version = "1.0.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "090198534930841fab3a5d1bb637cde49e339654e606195f8d9c76eeb081dc96"
+checksum = "a953cb265bef375dae3de6663da4d3804eee9682ea80d8e2542529b73c531c81"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.28",
+ "syn 2.0.50",
 ]
 
 [[package]]
@@ -2207,6 +2147,15 @@
 checksum = "87cc5ceb3875bb20c2890005a4e226a4651264a5c75edb2421b52861a0a0cb50"
 
 [[package]]
+name = "toml"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4f7f0dd8d50a853a531c426359045b1998f04219d88799810762cd4ad314234"
+dependencies = [
+ "serde",
+]
+
+[[package]]
 name = "typenum"
 version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2284,7 +2233,7 @@
 name = "ukey2_shell"
 version = "0.1.0"
 dependencies = [
- "clap 4.3.19",
+ "clap 4.5.1",
  "crypto_provider_rustcrypto",
  "ukey2_connections",
  "ukey2_rs",
@@ -2319,12 +2268,6 @@
 checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
 [[package]]
-name = "vcpkg"
-version = "0.2.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
-
-[[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2367,7 +2310,7 @@
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.28",
+ "syn 2.0.50",
  "wasm-bindgen-shared",
 ]
 
@@ -2389,7 +2332,7 @@
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.28",
+ "syn 2.0.50",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -2480,6 +2423,15 @@
 ]
 
 [[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets 0.52.3",
+]
+
+[[package]]
 name = "windows-targets"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2510,6 +2462,21 @@
 ]
 
 [[package]]
+name = "windows-targets"
+version = "0.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d380ba1dc7187569a8a9e91ed34b8ccfc33123bbacb8c0aed2d1ad7f3ef2dc5f"
+dependencies = [
+ "windows_aarch64_gnullvm 0.52.3",
+ "windows_aarch64_msvc 0.52.3",
+ "windows_i686_gnu 0.52.3",
+ "windows_i686_msvc 0.52.3",
+ "windows_x86_64_gnu 0.52.3",
+ "windows_x86_64_gnullvm 0.52.3",
+ "windows_x86_64_msvc 0.52.3",
+]
+
+[[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2522,6 +2489,12 @@
 checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
 
 [[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68e5dcfb9413f53afd9c8f86e56a7b4d86d9a2fa26090ea2dc9e40fba56c6ec6"
+
+[[package]]
 name = "windows_aarch64_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2534,6 +2507,12 @@
 checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
 
 [[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8dab469ebbc45798319e69eebf92308e541ce46760b49b18c6b3fe5e8965b30f"
+
+[[package]]
 name = "windows_i686_gnu"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2546,6 +2525,12 @@
 checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
 
 [[package]]
+name = "windows_i686_gnu"
+version = "0.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a4e9b6a7cac734a8b4138a4e1044eac3404d8326b6c0f939276560687a033fb"
+
+[[package]]
 name = "windows_i686_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2558,6 +2543,12 @@
 checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
 
 [[package]]
+name = "windows_i686_msvc"
+version = "0.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28b0ec9c422ca95ff34a78755cfa6ad4a51371da2a5ace67500cf7ca5f232c58"
+
+[[package]]
 name = "windows_x86_64_gnu"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2570,6 +2561,12 @@
 checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
 
 [[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "704131571ba93e89d7cd43482277d6632589b18ecf4468f591fbae0a8b101614"
+
+[[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2582,6 +2579,12 @@
 checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
 
 [[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42079295511643151e98d61c38c0acc444e52dd42ab456f7ccfd5152e8ecf21c"
+
+[[package]]
 name = "windows_x86_64_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2594,12 +2597,18 @@
 checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
 
 [[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0770833d60a970638e989b3fa9fd2bb1aaadcf88963d1659fd7d9990196ed2d6"
+
+[[package]]
 name = "wycheproof"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e639f57253b80c6584b378011aec0fed61c4c21d7a4b97c4d9d7eaf35ca77d12"
 dependencies = [
- "base64 0.21.2",
+ "base64",
  "hex",
  "serde",
  "serde_json",
@@ -2632,7 +2641,7 @@
  "aes",
  "anyhow",
  "array_ref",
- "base64 0.21.2",
+ "base64",
  "crypto_provider",
  "crypto_provider_default",
  "hex",

diff --git a/nearby/Cargo.toml b/nearby/Cargo.toml
index 774e1d8..301fe34 100644
--- a/nearby/Cargo.toml
+++ b/nearby/Cargo.toml

@@ -1,6 +1,5 @@
 [workspace]
 members = [
-    "connections/connections_adv/connections_adv",
     "connections/ukey2/ukey2",
     "connections/ukey2/ukey2_connections",
     "connections/ukey2/ukey2_c_ffi",
@@ -8,7 +7,6 @@
     "connections/ukey2/ukey2_proto",
     "connections/ukey2/ukey2_shell",
     "crypto/crypto_provider",
-    "crypto/crypto_provider_openssl",
     "crypto/crypto_provider_rustcrypto",
     "crypto/crypto_provider_stubs",
     "crypto/crypto_provider_test",
@@ -17,10 +15,12 @@
     "presence/array_view",
     "presence/ldt",
     "presence/ldt_np_adv",
+    "presence/ldt_np_adv_ffi",
     "presence/ldt_np_jni",
     "presence/ldt_tbc",
     "presence/np_adv",
     "presence/np_adv_dynamic",
+    "presence/np_c_ffi",
     "presence/np_ed25519",
     "presence/np_ffi_core",
     "presence/np_hkdf",
@@ -30,15 +30,14 @@
     "presence/xts_aes",
     "util/lock_adapter",
     "util/handle_map",
+    "util/pourover",
+    "util/pourover_macro",
+    "util/pourover_macro_core",
 ]
 
-# 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
-# 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.lints.rust]
@@ -56,14 +55,12 @@
 panic = "deny"
 expect_used = "deny"
 
-
 [workspace.dependencies]
 # local crates
 array_ref = { path = "presence/array_ref" }
 array_view = { path = "presence/array_view" }
 crypto_provider = { path = "crypto/crypto_provider", default-features = false }
-crypto_provider_default = { path = "crypto/crypto_provider_default", default-features = false }
-crypto_provider_openssl = { path = "crypto/crypto_provider_openssl" }
+crypto_provider_default = { path = "crypto/crypto_provider_default", default-features=false}
 crypto_provider_boringssl = { path = "crypto/crypto_provider_boringssl" }
 crypto_provider_rustcrypto = { path = "crypto/crypto_provider_rustcrypto" }
 crypto_provider_stubs = { path = "crypto/crypto_provider_stubs" }
@@ -83,64 +80,70 @@
 np_adv_dynamic = { path = "presence/np_adv_dynamic" }
 np_ed25519 = { path = "presence/np_ed25519" }
 np_ffi_core = { path = "presence/np_ffi_core" }
+pourover = { path = "util/pourover" }
+pourover_macro = { path = "util/pourover_macro" }
+pourover_macro_core = { path = "util/pourover_macro_core" }
 sink = { path = "presence/sink" }
 
 # from crates.io
 rand = { version = "0.8.5", default-features = false }
 rand_core = { version = "0.6.4", features = ["getrandom"] }
 rand_pcg = "0.3.1"
-sha2 = { version = "0.10.6", default-features = false }
-aes = "0.8.2"
+sha2 = { version = "0.10.8", default-features = false }
+aes = "0.8.3"
 cbc = { version = "0.1.2", features = ["block-padding"] }
-ctr = "0.9.1"
+ctr = "0.9.2"
 hkdf = "0.12.3"
 hmac = "0.12.1"
-ed25519-dalek = { version = "2.0.0", default-features = false }
-ed25519 = "2.2.0"
+ed25519-dalek = { version = "2.1.0", default-features = false }
+ed25519 = "2.2.3"
 aes-gcm = "0.10.3"
 hex = "0.4.3"
-serde = { version = "1.0.189" }
-serde_json = { version = "1.0.96", features = [
+serde = { version = "1.0.193" }
+serde_json = { version = "1.0.108", features = [
     "alloc",
 ], default-features = false }
-base64 = "0.21.0"
+base64 = "0.21.5"
 x25519-dalek = { version = "2.0.0", default-features = false }
 subtle = { version = "2.5.0", default-features = false }
 rand_chacha = { version = "0.3.1", default-features = false }
 p256 = { version = "0.13.2", default-features = false }
-sec1 = "0.7.2"
-protobuf = "3.2.0"
-protobuf-codegen = "3.2.0"
-reqwest = { version = "0.11.19", default-features = false, features = ["blocking", "rustls-tls"] }
+sec1 = "0.7.3"
+protobuf = "=3.2.0"
+protobuf-codegen = "=3.2.0"
+reqwest = { version = "0.11.22", default-features = false, features = ["blocking", "rustls-tls"] }
 jni = "0.21.1"
 lock_api = "0.4.11"
 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"] }
+anyhow = "1.0.75"
+log = "0.4.20"
+env_logger = "0.10.1"
+criterion = { version = "0.5.1", features = ["html_reports"] }
+clap = { version = "4.4.11", features = ["derive"] }
 lazy_static = { version = "1.4.0", features = ["spin_no_std"] }
 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 = "1.32.0", features = ["full"] }
+blake2 = "0.10.6"
+hdrhistogram = "7.5.4"
+regex = "1.10.2"
+tokio = { version = "1.35.0", features = ["full"] }
 xts-mode = "0.5.1"
-rstest = { version = "0.17.0", default-features = false }
+rstest = { version = "0.18.2", default-features = false }
 rstest_reuse = "0.6.0"
 wycheproof = "0.5.1"
-chrono = { version = "0.4.26", default-features = false, features = ["clock"] }
-tempfile = "3.5.0"
-thiserror = "1.0.40"
+chrono = { version = "0.4.31", default-features = false, features = ["clock"] }
+tempfile = "3.8.1"
+thiserror = "1.0.51"
 tinyvec = { version = "1.6.0", features = ["rustc_1_55"] }
-mlua = "0.8.8"
-strum = { version = "0.25.0", default-features=false }
-strum_macros = { version = "0.25.3", default-features=false }
+mlua = "0.9.2"
+strum = { version = "0.25.0", default-features = false }
+strum_macros = { version = "0.25.3", default-features = false }
 owo-colors = "3.5.0"
 rhai = { version = "1.16.3", features = ["sync"] }
+cbindgen = "0.26.0"
+syn = { version = "2.0", features = ["full"] }
+proc-macro2 = "1.0"
+quote = "1.0"
 
 [workspace.package]
 version = "0.1.0"
@@ -175,13 +178,14 @@
 
 [dependencies]
 clap.workspace = true
-cmd-runner = { path = "../cmd-runner"  }
+cmd-runner = { path = "../cmd-runner" }
 anyhow.workspace = true
 shell-escape = "0.1.5"
 owo-colors.workspace = true
 semver = "1.0.17"
 walkdir = "2.3.3"
 globset = "0.4.10"
+glob = "0.3.1"
 crossbeam = "0.8.2"
 chrono.workspace = true
 thiserror.workspace = true

diff --git a/nearby/connections/connections_adv/connections_adv/Cargo.toml b/nearby/connections/connections_adv/connections_adv/Cargo.toml
deleted file mode 100644
index 2b0710d..0000000
--- a/nearby/connections/connections_adv/connections_adv/Cargo.toml
+++ /dev/null

@@ -1,8 +0,0 @@
-[package]
-name = "connections_adv"
-version.workspace = true
-edition.workspace = true
-publish.workspace = true
-
-[lints]
-workspace = true
\ No newline at end of file

diff --git a/nearby/connections/ukey2/ukey2/Cargo.toml b/nearby/connections/ukey2/ukey2/Cargo.toml
index 161c5b4..35de144 100644
--- a/nearby/connections/ukey2/ukey2/Cargo.toml
+++ b/nearby/connections/ukey2/ukey2/Cargo.toml

@@ -10,7 +10,6 @@
 [features]
 default = []
 test_rustcrypto = ["crypto_provider_default/rustcrypto"]
-test_openssl = ["crypto_provider_default/openssl"]
 test_boringssl = ["crypto_provider_default/boringssl"]
 
 [dependencies]
@@ -19,7 +18,7 @@
 ukey2_proto.workspace = true
 log.workspace = true
 
-num-bigint = "0.4.3"
+num-bigint = "0.4.4"
 
 [dev-dependencies]
 rand = { workspace = true, features = ["std_rng", "getrandom"] }

diff --git a/nearby/connections/ukey2/ukey2_c_ffi/Cargo.toml b/nearby/connections/ukey2/ukey2_c_ffi/Cargo.toml
index 182ecf2..f302119 100644
--- a/nearby/connections/ukey2/ukey2_c_ffi/Cargo.toml
+++ b/nearby/connections/ukey2/ukey2_c_ffi/Cargo.toml

@@ -19,7 +19,6 @@
 [features]
 default = ["rustcrypto", "std"]
 std = ["lock_adapter/std"]
-openssl = ["crypto_provider_default/openssl", "std"]
 boringssl = ["crypto_provider_default/boringssl", "std"]
 rustcrypto = ["crypto_provider_default/rustcrypto"]
 

diff --git a/nearby/connections/ukey2/ukey2_connections/Cargo.toml b/nearby/connections/ukey2/ukey2_connections/Cargo.toml
index e7884c4..5c9622b 100644
--- a/nearby/connections/ukey2/ukey2_connections/Cargo.toml
+++ b/nearby/connections/ukey2/ukey2_connections/Cargo.toml

@@ -11,7 +11,6 @@
 default = []
 test_boringssl = ["crypto_provider_default/boringssl"]
 test_rustcrypto = ["crypto_provider_default/rustcrypto"]
-test_openssl = ["crypto_provider_default/openssl"]
 
 [dependencies]
 ukey2_rs = { path = "../ukey2" }
@@ -19,8 +18,8 @@
 crypto_provider.workspace = true
 rand = { workspace = true, features = ["std", "std_rng"] }
 ukey2_proto.workspace = true
-nom = { version = "7.1.1", features = ["alloc"] }
-bytes = "1.2.1"
+nom = { version = "7.1.3", features = ["alloc"] }
+bytes = "1.5.0"
 criterion.workspace = true
 
 [dev-dependencies]

diff --git a/nearby/connections/ukey2/ukey2_connections/fuzz/Cargo.lock b/nearby/connections/ukey2/ukey2_connections/fuzz/Cargo.lock
index b4e08bd..df37761 100644
--- a/nearby/connections/ukey2/ukey2_connections/fuzz/Cargo.lock
+++ b/nearby/connections/ukey2/ukey2_connections/fuzz/Cargo.lock

@@ -55,9 +55,9 @@
 
 [[package]]
 name = "aho-corasick"
-version = "1.0.2"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43f6cb1bf222025340178f382c426f13757b2960e89779dfcb319c32542a5a41"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
 dependencies = [
  "memchr",
 ]
@@ -69,32 +69,27 @@
 checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
 
 [[package]]
-name = "anyhow"
-version = "1.0.72"
+name = "anstyle"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b13c32d80ecc7ab747b80c3784bce54ee8a7a0cc4fbda9bf4cda2cf6fe90854"
+checksum = "8901269c6307e8d93993578286ac0edf7f195079ffff5ebdeea6a59ffb7e36bc"
+
+[[package]]
+name = "anyhow"
+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "080e9890a082662b09c1ad45f567faeeb47f22b5fb23895fbe1e651e718e25ca"
 
 [[package]]
 name = "arbitrary"
-version = "1.3.0"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
+checksum = "7d5a26814d8dcb93b0e5a0ff3c6d80a8843bafb21b39e8e18a6f05471870e110"
 dependencies = [
  "derive_arbitrary",
 ]
 
 [[package]]
-name = "atty"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
-dependencies = [
- "hermit-abi 0.1.19",
- "libc",
- "winapi",
-]
-
-[[package]]
 name = "autocfg"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -108,9 +103,9 @@
 
 [[package]]
 name = "bitflags"
-version = "1.3.2"
+version = "2.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
 
 [[package]]
 name = "block-buffer"
@@ -132,15 +127,15 @@
 
 [[package]]
 name = "bumpalo"
-version = "3.13.0"
+version = "3.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
+checksum = "7f30e7476521f6f8af1a1c4c0b8cc94f0bee37d91763d0ca2665f299b6cd8aec"
 
 [[package]]
 name = "bytes"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "cast"
@@ -159,11 +154,12 @@
 
 [[package]]
 name = "cc"
-version = "1.0.79"
+version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
 dependencies = [
  "jobserver",
+ "libc",
 ]
 
 [[package]]
@@ -174,9 +170,9 @@
 
 [[package]]
 name = "ciborium"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "effd91f6c78e5a4ace8a5d3c0b6bfaec9e2baaef55f3efc00e45fb2e477ee926"
+checksum = "42e69ffd6f0917f5c029256a24d0161db17cea3997d185db0d35926308770f0e"
 dependencies = [
  "ciborium-io",
  "ciborium-ll",
@@ -185,15 +181,15 @@
 
 [[package]]
 name = "ciborium-io"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cdf919175532b369853f5d5e20b26b43112613fd6fe7aee757e35f7a44642656"
+checksum = "05afea1e0a06c9be33d539b876f1ce3692f4afea2cb41f740e7743225ed1c757"
 
 [[package]]
 name = "ciborium-ll"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "defaa24ecc093c77630e6c15e17c51f5e187bf35ee514f4e2d67baaa96dae22b"
+checksum = "57663b653d948a338bfb3eeba9bb2fd5fcfaecb9e199e87e1eda4d9e8b240fd9"
 dependencies = [
  "ciborium-io",
  "half",
@@ -211,55 +207,59 @@
 
 [[package]]
 name = "clap"
-version = "3.2.25"
+version = "4.4.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
+checksum = "1e578d6ec4194633722ccf9544794b71b1385c3c027efe0c55db226fc880865c"
 dependencies = [
- "bitflags",
+ "clap_builder",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.4.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4df4df40ec50c46000231c914968278b1eb05098cf8f1b3a518a95030e71d1c7"
+dependencies = [
+ "anstyle",
  "clap_lex",
- "indexmap",
- "textwrap",
 ]
 
 [[package]]
 name = "clap_lex"
-version = "0.2.4"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
-dependencies = [
- "os_str_bytes",
-]
+checksum = "702fc72eb24e5a1e48ce58027a675bc24edd52096d5397d4aea7c6dd9eca0bd1"
 
 [[package]]
 name = "const-oid"
-version = "0.9.4"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.9"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "criterion"
-version = "0.4.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7c76e09c1aae2bc52b3d2f29e13c6572553b30c4aa1b8a49fd70de6412654cb"
+checksum = "f2b12d017a929603d80db1831cd3a24082f8137ce19c69e6447f54f5fc8d692f"
 dependencies = [
  "anes",
- "atty",
  "cast",
  "ciborium",
  "clap",
  "criterion-plot",
+ "is-terminal",
  "itertools",
- "lazy_static",
  "num-traits",
+ "once_cell",
  "oorandom",
  "plotters",
  "rayon",
@@ -282,53 +282,41 @@
 ]
 
 [[package]]
-name = "crossbeam-channel"
-version = "0.5.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a33c2bf77f2df06183c3aa30d1e96c0695a313d4f9c453cc3762a6db39f99200"
-dependencies = [
- "cfg-if",
- "crossbeam-utils",
-]
-
-[[package]]
 name = "crossbeam-deque"
-version = "0.8.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce6fd6f855243022dcecf8702fef0c297d4338e226845fe067f6341ad9fa0cef"
+checksum = "613f8cc01fe9cf1a3eb3d7f488fd2fa8388403e97039e2f73692932e291a770d"
 dependencies = [
- "cfg-if",
  "crossbeam-epoch",
  "crossbeam-utils",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.9.15"
+version = "0.9.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae211234986c545741a7dc064309f67ee1e5ad243d0e48335adc0484d960bcc7"
+checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
 dependencies = [
- "autocfg",
- "cfg-if",
  "crossbeam-utils",
- "memoffset",
- "scopeguard",
 ]
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.16"
+version = "0.8.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
-dependencies = [
- "cfg-if",
-]
+checksum = "248e3bacc7dc6baa3b21e405ee045c3047101a49145e7e9eca583ab4c2ca5345"
+
+[[package]]
+name = "crunchy"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.2"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -390,9 +378,9 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0"
+version = "4.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
+checksum = "0a677b8922c94e01bdbb12126b0bc852f00447528dee1782229af9c720c3f348"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -406,9 +394,9 @@
 
 [[package]]
 name = "curve25519-dalek-derive"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -417,9 +405,9 @@
 
 [[package]]
 name = "der"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
+checksum = "fffa369a668c8af7dbf8b5e56c9f744fbd399949ed171606040001947de40b1c"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -427,9 +415,9 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.1"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
+checksum = "67e77553c4162a157adbf834ebae5b415acbecbeafc7a74b0e886657506a7611"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -449,36 +437,37 @@
 
 [[package]]
 name = "ed25519"
-version = "2.2.1"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fb04eee5d9d907f29e80ee6b0e78f7e2c82342c63e3580d8c4f69d9d5aad963"
+checksum = "115531babc129696a58c64a4fef0a8bf9e9698629fb97e9e40767d235cfbcd53"
 dependencies = [
  "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+checksum = "4a3daa8e81a3963a60642bcc1f90a670680bd4a77535faa384e9d1c79d620871"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
  "rand_core",
  "sha2",
+ "subtle",
 ]
 
 [[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 = "0.13.5"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -495,33 +484,19 @@
 
 [[package]]
 name = "errno"
-version = "0.3.1"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a"
+checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
 dependencies = [
- "errno-dragonfly",
  "libc",
  "windows-sys",
 ]
 
 [[package]]
-name = "errno-dragonfly"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa68f1b12764fab894d2755d2518754e71b4fd80ecfb822714a1206c2aab39bf"
-dependencies = [
- "cc",
- "libc",
-]
-
-[[package]]
 name = "fastrand"
-version = "1.9.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e51093e27b0797c359783294ca4f0a911c270184cb10f85783b118614a1501be"
-dependencies = [
- "instant",
-]
+checksum = "25cbce373ec4653f1a01a31e8a5e5ec0c622dc27ff9c4e6606eefef5cbbed4a5"
 
 [[package]]
 name = "ff"
@@ -535,9 +510,9 @@
 
 [[package]]
 name = "fiat-crypto"
-version = "0.1.20"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+checksum = "1676f435fc1dadde4d03e43f5d62b259e1ce5f40bd4ffb21db2b42ebe59c1382"
 
 [[package]]
 name = "generic-array"
@@ -552,9 +527,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.10"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
 dependencies = [
  "cfg-if",
  "libc",
@@ -584,9 +559,13 @@
 
 [[package]]
 name = "half"
-version = "1.8.2"
+version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
+checksum = "bc52e53916c08643f1b56ec082790d1e86a32e58dc5268f897f313fbae7b4872"
+dependencies = [
+ "cfg-if",
+ "crunchy",
+]
 
 [[package]]
 name = "hashbrown"
@@ -596,24 +575,15 @@
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.19"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "hermit-abi"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
+checksum = "d0c62115964e08cb8039170eb33c1d0e2388a256930279edca206fff675f82c3"
 
 [[package]]
 name = "hkdf"
-version = "0.12.3"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791a029f6b9fc27657f6f188ec6e5e43f6911f6f878e0dc5501396e09809d437"
+checksum = "7b5f8eb2ad728638ea2c7d47a21db23b7b58a72ed6a38256b8a1849f15fbbdf7"
 dependencies = [
  "hmac",
 ]
@@ -628,6 +598,15 @@
 ]
 
 [[package]]
+name = "home"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d1354bf6b7235cb4a0576c2619fd4ed18183f689b12b006a0ee7329eeff9a5"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
 name = "indexmap"
 version = "1.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -648,22 +627,13 @@
 ]
 
 [[package]]
-name = "instant"
-version = "0.1.12"
+name = "is-terminal"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+checksum = "0bad00257d07be169d870ab665980b06cdb366d792ad690bf2e76876dc503455"
 dependencies = [
- "cfg-if",
-]
-
-[[package]]
-name = "io-lifetimes"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eae7b9aee968036d54dce06cebaefd919e4472e753296daccd6d344e3e2df0c2"
-dependencies = [
- "hermit-abi 0.3.2",
- "libc",
+ "hermit-abi",
+ "rustix",
  "windows-sys",
 ]
 
@@ -678,45 +648,39 @@
 
 [[package]]
 name = "itoa"
-version = "1.0.9"
+version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
+checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
 
 [[package]]
 name = "jobserver"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
+checksum = "8c37f63953c4c63420ed5fd3d6d398c719489b9f872b9fa683262f8edd363c7d"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "js-sys"
-version = "0.3.64"
+version = "0.3.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c5f195fe497f702db0f318b07fdd68edb16955aed830df8363d837542f8f935a"
+checksum = "406cda4b368d531c842222cf9d2600a9a4acce8d29423695379c6868a143a9ee"
 dependencies = [
  "wasm-bindgen",
 ]
 
 [[package]]
-name = "lazy_static"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
-
-[[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "libfuzzer-sys"
-version = "0.4.6"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "beb09950ae85a0a94b27676cccf37da5ff13f27076aa1adbc6545dd0d0e1bd4e"
+checksum = "a96cfd5557eb82f2b83fed4955246c988d331975a002961b07c81584d107e7f7"
 dependencies = [
  "arbitrary",
  "cc",
@@ -725,30 +689,21 @@
 
 [[package]]
 name = "linux-raw-sys"
-version = "0.3.8"
+version = "0.4.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef53942eb7bf7ff43a617b3e2c1c4a5ecf5944a7c1bc12d7ee39bbb15e5c1519"
+checksum = "01cda141df6706de531b6c46c3a33ecca755538219bd484262fa09410c13539c"
 
 [[package]]
 name = "log"
-version = "0.4.19"
+version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b06a4cde4c0f271a446782e3eff8de789548ce57dbc8eca9292c27f4a42004b4"
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "memchr"
-version = "2.5.0"
+version = "2.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
-
-[[package]]
-name = "memoffset"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
-dependencies = [
- "autocfg",
-]
+checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
 
 [[package]]
 name = "minimal-lexical"
@@ -768,9 +723,9 @@
 
 [[package]]
 name = "num-bigint"
-version = "0.4.3"
+version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
+checksum = "608e7659b5c3d7cba262d894801b9ec9d00de989e8a82bd4bef91d08da45cdc0"
 dependencies = [
  "autocfg",
  "num-integer",
@@ -789,28 +744,18 @@
 
 [[package]]
 name = "num-traits"
-version = "0.2.15"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
 dependencies = [
  "autocfg",
 ]
 
 [[package]]
-name = "num_cpus"
-version = "1.16.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
-dependencies = [
- "hermit-abi 0.3.2",
- "libc",
-]
-
-[[package]]
 name = "once_cell"
-version = "1.18.0"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "oorandom"
@@ -825,12 +770,6 @@
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
 [[package]]
-name = "os_str_bytes"
-version = "6.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d5d9eb14b174ee9aa2ef96dc2b94637a2d4b6e7cb873c7e171f0c20c6cf3eac"
-
-[[package]]
 name = "p256"
 version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -842,9 +781,9 @@
 
 [[package]]
 name = "platforms"
-version = "3.0.2"
+version = "3.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+checksum = "626dec3cac7cc0e1577a2ec3fc496277ec2baa084bebad95bb6fdbfae235f84c"
 
 [[package]]
 name = "plotters"
@@ -894,18 +833,18 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.2"
+version = "0.13.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
+checksum = "353e1ca18966c16d9deb1c69278edbc5f194139612772bd9537af60ac231e1e6"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
@@ -963,9 +902,9 @@
 
 [[package]]
 name = "quote"
-version = "1.0.31"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -1002,9 +941,9 @@
 
 [[package]]
 name = "rayon"
-version = "1.7.0"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d2df5196e37bcc87abebc0053e20787d73847bb33134a69841207dd0a47f03b"
+checksum = "fa7237101a77a10773db45d62004a272517633fbcc3df19d96455ede1122e051"
 dependencies = [
  "either",
  "rayon-core",
@@ -1012,30 +951,19 @@
 
 [[package]]
 name = "rayon-core"
-version = "1.11.0"
+version = "1.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b8f95bd6966f5c87776639160a66bd8ab9895d9d4ab01ddba9fc60661aebe8d"
+checksum = "1465873a3dfdaa8ae7cb14b4383657caab0b3e8a0aa9ae8e04b044854c8dfce2"
 dependencies = [
- "crossbeam-channel",
  "crossbeam-deque",
  "crossbeam-utils",
- "num_cpus",
-]
-
-[[package]]
-name = "redox_syscall"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
-dependencies = [
- "bitflags",
 ]
 
 [[package]]
 name = "regex"
-version = "1.9.1"
+version = "1.10.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2eae68fc220f7cf2532e4494aded17545fce192d59cd996e0fe7887f4ceb575"
+checksum = "b62dbe01f0b06f9d8dc7d49e05a0785f153b00b2c227856282f671e0318c9b15"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -1045,9 +973,9 @@
 
 [[package]]
 name = "regex-automata"
-version = "0.3.3"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39354c10dd07468c2e73926b23bb9c2caca74c5501e38a35da70406f1d923310"
+checksum = "5bb987efffd3c6d0d8f5f89510bb458559eab11e4f869acb20bf845e016259cd"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -1056,9 +984,9 @@
 
 [[package]]
 name = "regex-syntax"
-version = "0.7.4"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
 
 [[package]]
 name = "rustc_version"
@@ -1071,13 +999,12 @@
 
 [[package]]
 name = "rustix"
-version = "0.37.23"
+version = "0.38.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d69718bf81c6127a49dc64e44a742e8bb9213c0ff8869a22c308f84c1d4ab06"
+checksum = "6ea3e1a662af26cd7a3ba09c0297a31af215563ecf42817c98df621387f4e949"
 dependencies = [
  "bitflags",
  "errno",
- "io-lifetimes",
  "libc",
  "linux-raw-sys",
  "windows-sys",
@@ -1085,9 +1012,9 @@
 
 [[package]]
 name = "ryu"
-version = "1.0.15"
+version = "1.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
+checksum = "f98d2aa92eebf49b69786be48e4477826b256916e84a57ff2a4f21923b48eb4c"
 
 [[package]]
 name = "same-file"
@@ -1099,12 +1026,6 @@
 ]
 
 [[package]]
-name = "scopeguard"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
-
-[[package]]
 name = "sec1"
 version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1119,24 +1040,24 @@
 
 [[package]]
 name = "semver"
-version = "1.0.18"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+checksum = "b97ed7a9823b74f99c7742f5336af7be5ecd3eeafcb1507d1fa93347b1d589b0"
 
 [[package]]
 name = "serde"
-version = "1.0.171"
+version = "1.0.196"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30e27d1e4fd7659406c492fd6cfaf2066ba8773de45ca75e855590f856dc34a9"
+checksum = "870026e60fa08c69f064aa766c10f10b1d62db9ccd4d0abb206472bee0ce3b32"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.171"
+version = "1.0.196"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "389894603bd18c46fa56231694f8d827779c0951a667087194cf9de94ed24682"
+checksum = "33c85360c95e7d137454dc81d9a4ed2b8efd8fbe19cee57357b32b9771fccb67"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1145,9 +1066,9 @@
 
 [[package]]
 name = "serde_json"
-version = "1.0.103"
+version = "1.0.113"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d03b412469450d4404fe8499a268edd7f8b79fecb074b0d812ad64ca21f4031b"
+checksum = "69801b70b1c3dac963ecb03a364ba0ceda9cf60c71cfe475e99864759c8b8a79"
 dependencies = [
  "itoa",
  "ryu",
@@ -1156,9 +1077,9 @@
 
 [[package]]
 name = "sha2"
-version = "0.10.7"
+version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -1167,9 +1088,9 @@
 
 [[package]]
 name = "signature"
-version = "2.1.0"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
+checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
 
 [[package]]
 name = "subtle"
@@ -1179,9 +1100,9 @@
 
 [[package]]
 name = "syn"
-version = "2.0.26"
+version = "2.0.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
+checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1190,38 +1111,30 @@
 
 [[package]]
 name = "tempfile"
-version = "3.6.0"
+version = "3.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "31c0432476357e58790aaa47a8efb0c5138f137343f3b5f23bd36a27e3b0a6d6"
+checksum = "a365e8cd18e44762ef95d87f284f4b5cd04107fec2ff3052bd6a3e6069669e67"
 dependencies = [
- "autocfg",
  "cfg-if",
  "fastrand",
- "redox_syscall",
  "rustix",
  "windows-sys",
 ]
 
 [[package]]
-name = "textwrap"
-version = "0.16.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "222a222a5bfe1bba4a77b45ec488a741b3cb8872e5e499451fd7d0129c9c7c3d"
-
-[[package]]
 name = "thiserror"
-version = "1.0.43"
+version = "1.0.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a35fc5b8971143ca348fa6df4f024d4d55264f3468c71ad1c2f365b0a4d58c42"
+checksum = "d54378c645627613241d077a3a79db965db602882668f9136ac42af9ecb730ad"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.43"
+version = "1.0.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "463fe12d7993d3b327787537ce8dd4dfa058de32fc2b195ef3cde03dc4771e8f"
+checksum = "fa0faa943b50f3db30a20aa7e265dbc66076993efed8463e8de414e5d06d3471"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1246,9 +1159,9 @@
 
 [[package]]
 name = "typenum"
-version = "1.16.0"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
 
 [[package]]
 name = "ukey2_connections"
@@ -1296,9 +1209,9 @@
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.11"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "universal-hash"
@@ -1318,9 +1231,9 @@
 
 [[package]]
 name = "walkdir"
-version = "2.3.3"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36df944cda56c7d8d8b7496af378e6b16de9284591917d307c9b4d313c44e698"
+checksum = "d71d857dc86794ca4c280d616f7da00d2dbfd8cd788846559a6813e6aa4b54ee"
 dependencies = [
  "same-file",
  "winapi-util",
@@ -1334,9 +1247,9 @@
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.87"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7706a72ab36d8cb1f80ffbf0e071533974a60d0a308d01a5d0375bf60499a342"
+checksum = "c1e124130aee3fb58c5bdd6b639a0509486b0338acaaae0c84a5124b0f588b7f"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
@@ -1344,9 +1257,9 @@
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.87"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ef2b6d3c510e9625e5fe6f509ab07d66a760f0885d858736483c32ed7809abd"
+checksum = "c9e7e1900c352b609c8488ad12639a311045f40a35491fb69ba8c12f758af70b"
 dependencies = [
  "bumpalo",
  "log",
@@ -1359,9 +1272,9 @@
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.87"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dee495e55982a3bd48105a7b947fd2a9b4a8ae3010041b9e0faab3f9cd028f1d"
+checksum = "b30af9e2d358182b5c7449424f017eba305ed32a7010509ede96cdc4696c46ed"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -1369,9 +1282,9 @@
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.87"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
+checksum = "642f325be6301eb8107a83d12a8ac6c1e1c54345a7ef1a9261962dfefda09e66"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1382,15 +1295,15 @@
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.87"
+version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca6ad05a4870b2bf5fe995117d3728437bd27d7cd5f06f13c17443ef369775a1"
+checksum = "4f186bd2dcf04330886ce82d6f33dd75a7bfcf69ecf5763b89fcde53b6ac9838"
 
 [[package]]
 name = "web-sys"
-version = "0.3.64"
+version = "0.3.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b85cbef8c220a6abc02aefd892dfc0fc23afb1c6a426316ec33253a3877249b"
+checksum = "96565907687f7aceb35bc5fc03770a8a0471d82e479f25832f54a0e3f4b28446"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
@@ -1398,13 +1311,14 @@
 
 [[package]]
 name = "which"
-version = "4.4.0"
+version = "4.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2441c784c52b289a054b7201fc93253e288f094e2f4be9058343127c4226a269"
+checksum = "87ba24419a2078cd2b0f2ede2691b6c66d8e47836da3b6db8265ebad47afbfc7"
 dependencies = [
  "either",
- "libc",
+ "home",
  "once_cell",
+ "rustix",
 ]
 
 [[package]]
@@ -1425,9 +1339,9 @@
 
 [[package]]
 name = "winapi-util"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+checksum = "f29e6f9198ba0d26b4c9f07dbe6f9ed633e1f3d5b8b414090084349e46a52596"
 dependencies = [
  "winapi",
 ]
@@ -1440,18 +1354,18 @@
 
 [[package]]
 name = "windows-sys"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
 dependencies = [
  "windows-targets",
 ]
 
 [[package]]
 name = "windows-targets"
-version = "0.48.1"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "05d4b17490f70499f20b9e791dcf6a299785ce8af4d709018206dc5b4953e95f"
+checksum = "8a18201040b24831fbb9e4eb208f8892e1f50a37feb53cc7ff887feb8f50e7cd"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -1464,51 +1378,51 @@
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
+checksum = "cb7764e35d4db8a7921e09562a0304bf2f93e0a51bfccee0bd0bb0b666b015ea"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
+checksum = "bbaa0368d4f1d2aaefc55b6fcfee13f41544ddf36801e793edbbfd7d7df075ef"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
+checksum = "a28637cb1fa3560a16915793afb20081aba2c92ee8af57b4d5f28e4b3e7df313"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
+checksum = "ffe5e8e31046ce6230cc7215707b816e339ff4d4d67c65dffa206fd0f7aa7b9a"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
+checksum = "3d6fa32db2bc4a2f5abeacf2b69f7992cd09dca97498da74a151a3132c26befd"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+checksum = "1a657e1e9d3f514745a572a6846d3c7aa7dbe1658c056ed9c3344c4109a6949e"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.48.0"
+version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb66477291e7e8d2b0ff1bcb900bf29489a9692816d79874bea351e7a8b6de96"
+checksum = "c7e468321c81fb07fa7f4c636c3972b9100f0346e5b6a9f2bd0603a52f7ed277"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
@@ -1516,6 +1430,6 @@
 
 [[package]]
 name = "zeroize"
-version = "1.6.0"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
+checksum = "525b4ec142c6b68a2d10f01f7bbf6755599ca3f81ea53b8431b7dd348f5fdb2d"

diff --git a/nearby/connections/ukey2/ukey2_jni/Cargo.toml b/nearby/connections/ukey2/ukey2_jni/Cargo.toml
index 08566dd..8a5b0fe 100644
--- a/nearby/connections/ukey2/ukey2_jni/Cargo.toml
+++ b/nearby/connections/ukey2/ukey2_jni/Cargo.toml

@@ -24,7 +24,6 @@
 
 [features]
 default = ["rustcrypto"]
-openssl = ["crypto_provider_default/openssl", "std"]
 rustcrypto = ["crypto_provider_default/rustcrypto"]
 boringssl = ["crypto_provider_default/boringssl"]
 std = ["lock_adapter/std"]

diff --git a/nearby/connections/ukey2/ukey2_jni/java/build.gradle.kts b/nearby/connections/ukey2/ukey2_jni/java/build.gradle.kts
index 58c58fc..78b0ebc 100644
--- a/nearby/connections/ukey2/ukey2_jni/java/build.gradle.kts
+++ b/nearby/connections/ukey2/ukey2_jni/java/build.gradle.kts

@@ -44,6 +44,7 @@
     implementation("com.google.code.findbugs:jsr305:3.0.2")
     implementation(kotlin("stdlib"))
     testImplementation("org.junit.jupiter:junit-jupiter:5.9.2")
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.9.2")
 }
 
 kotlin {
@@ -51,10 +52,10 @@
 }
 
 tasks.jmh {
-    jvmArgs.value(mutableListOf("-Djava.library.path=../../../../target/release"))
+    jvmArgs.value(mutableListOf("-Djava.library.path=$projectDir/../../../../target/release"))
 }
 
 tasks.test {
     useJUnitPlatform()
-    jvmArgs = mutableListOf("-Djava.library.path=../../../../target/debug")
+    jvmArgs = mutableListOf("-Djava.library.path=$projectDir/../../../../target/debug")
 }

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/jmh/java/com/google/security/cryptauth/lib/securegcm/Ukey2Benchmark.java b/nearby/connections/ukey2/ukey2_jni/java/src/jmh/java/com/google/security/cryptauth/lib/securegcm/Ukey2Benchmark.java
deleted file mode 100644
index eb063cc..0000000
--- a/nearby/connections/ukey2/ukey2_jni/java/src/jmh/java/com/google/security/cryptauth/lib/securegcm/Ukey2Benchmark.java
+++ /dev/null

@@ -1,83 +0,0 @@
-/*
- * 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.
- */
-
-package com.google.security.cryptauth.lib.securegcm;
-
-import org.openjdk.jmh.annotations.*;
-import org.openjdk.jmh.infra.Blackhole;
-import org.openjdk.jmh.profile.GCProfiler;
-import org.openjdk.jmh.runner.Runner;
-import org.openjdk.jmh.runner.RunnerException;
-import org.openjdk.jmh.runner.options.Options;
-import org.openjdk.jmh.runner.options.OptionsBuilder;
-
-import java.nio.charset.StandardCharsets;
-import java.time.Duration;
-import java.util.concurrent.TimeUnit;
-import java.util.Random;
-
-/**
- * Benchmark for encoding and decoding UKEY2 messages over the JNI, analogous to
- * `ukey2_benches.rs`. The parameters and the operations also roughly matches the that of the Rust
- * Criterion benchmark. That said, since the benchmark infrastructure is different, there will
- * inevitably be differences the skews the number in certain ways – comparison of numbers from the
- * different benchmarks should compared on order-of-magnitudes only. To get the JNI overhead, for
- * example, it would be better use this JMH infra to measure a call into a no-op Rust function,
- * which is a more apples-to-apples comparison.
- *
- * To run this benchmark, run
- *   cargo build -p ukey2_jni --release && ./gradlew jmh
- */
-@State(Scope.Benchmark)
-@OutputTimeUnit(TimeUnit.SECONDS)
-@BenchmarkMode(Mode.Throughput)
-public class Ukey2Benchmark {
-
-    @State(Scope.Thread)
-    public static class ConnectionState {
-        D2DConnectionContextV1 connContext;
-        D2DConnectionContextV1 serverConnContext;
-        @Param({"10", "1024"})
-        int sizeKibs;
-        byte[] inputBytes;
-
-        @Setup
-        public void setup() throws Exception {
-            D2DHandshakeContext initiatorContext =
-                new D2DHandshakeContext(D2DHandshakeContext.Role.Initiator);
-            D2DHandshakeContext serverContext =
-                new D2DHandshakeContext(D2DHandshakeContext.Role.Responder);
-            serverContext.parseHandshakeMessage(initiatorContext.getNextHandshakeMessage());
-            initiatorContext.parseHandshakeMessage(serverContext.getNextHandshakeMessage());
-            serverContext.parseHandshakeMessage(initiatorContext.getNextHandshakeMessage());
-            connContext = initiatorContext.toConnectionContext();
-            serverConnContext = serverContext.toConnectionContext();
-            Random random = new Random();
-            inputBytes = new byte[sizeKibs * 1024];
-            random.nextBytes(inputBytes);
-        }
-    }
-
-    @Benchmark
-    @Fork(3)
-    @Warmup(iterations = 2, time = 500, timeUnit = TimeUnit.MILLISECONDS)
-    @Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
-    public void encodeAndDecode(ConnectionState state, Blackhole blackhole) throws Exception {
-        byte[] encoded = state.connContext.encodeMessageToPeer(state.inputBytes, null);
-        byte[] decoded = state.serverConnContext.decodeMessageFromPeer(encoded, null);
-        blackhole.consume(decoded);
-    }
-}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/jmh/java/com/google/security/cryptauth/lib/securegcm/ukey2/Ukey2Benchmark.java b/nearby/connections/ukey2/ukey2_jni/java/src/jmh/java/com/google/security/cryptauth/lib/securegcm/ukey2/Ukey2Benchmark.java
new file mode 100644
index 0000000..fcc07b8
--- /dev/null
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/jmh/java/com/google/security/cryptauth/lib/securegcm/ukey2/Ukey2Benchmark.java

@@ -0,0 +1,75 @@
+/*
+ * 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.
+ */
+
+package com.google.security.cryptauth.lib.securegcm.ukey2;
+
+import com.google.security.cryptauth.lib.securegcm.ukey2.D2DHandshakeContext.Role;
+import java.util.Random;
+import java.util.concurrent.TimeUnit;
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+
+/**
+ * Benchmark for encoding and decoding UKEY2 messages over the JNI, analogous to `ukey2_benches.rs`.
+ * The parameters and the operations also roughly matches the that of the Rust Criterion benchmark.
+ * That said, since the benchmark infrastructure is different, there will inevitably be differences
+ * the skews the number in certain ways – comparison of numbers from the different benchmarks should
+ * compared on order-of-magnitudes only. To get the JNI overhead, for example, it would be better
+ * use this JMH infra to measure a call into a no-op Rust function, which is a more apples-to-apples
+ * comparison.
+ *
+ * <p>To run this benchmark, run cargo build -p ukey2_jni --release && ./gradlew jmh
+ */
+@State(Scope.Benchmark)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@BenchmarkMode(Mode.Throughput)
+public class Ukey2Benchmark {
+
+  @State(Scope.Thread)
+  public static class ConnectionState {
+    D2DConnectionContextV1 connContext;
+    D2DConnectionContextV1 serverConnContext;
+
+    @Param({"10", "1024"})
+    int sizeKibs;
+
+    byte[] inputBytes;
+
+    @Setup
+    public void setup() throws Exception {
+      D2DHandshakeContext initiatorContext = new D2DHandshakeContext(Role.INITIATOR);
+      D2DHandshakeContext serverContext = new D2DHandshakeContext(Role.RESPONDER);
+      serverContext.parseHandshakeMessage(initiatorContext.getNextHandshakeMessage());
+      initiatorContext.parseHandshakeMessage(serverContext.getNextHandshakeMessage());
+      serverContext.parseHandshakeMessage(initiatorContext.getNextHandshakeMessage());
+      connContext = initiatorContext.toConnectionContext();
+      serverConnContext = serverContext.toConnectionContext();
+      Random random = new Random();
+      inputBytes = new byte[sizeKibs * 1024];
+      random.nextBytes(inputBytes);
+    }
+  }
+
+  @Benchmark
+  @Fork(3)
+  @Warmup(iterations = 2, time = 500, timeUnit = TimeUnit.MILLISECONDS)
+  @Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
+  public void encodeAndDecode(ConnectionState state, Blackhole blackhole) throws Exception {
+    byte[] encoded = state.connContext.encodeMessageToPeer(state.inputBytes, null);
+    byte[] decoded = state.serverConnContext.decodeMessageFromPeer(encoded, null);
+    blackhole.consume(decoded);
+  }
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DConnectionContextV1.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DConnectionContextV1.java
deleted file mode 100644
index 7874cd9..0000000
--- a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DConnectionContextV1.java
+++ /dev/null

@@ -1,123 +0,0 @@
-/*
- * 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.
- */
-
-package com.google.security.cryptauth.lib.securegcm;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-
-public class D2DConnectionContextV1 {
-
-    static {
-        System.loadLibrary("ukey2_jni");
-    }
-
-    private static native byte[] encode_message_to_peer(long contextPtr, byte[] payload, byte[] associatedData) throws BadHandleException;
-
-    private static native byte[] decode_message_from_peer(long contextPtr, byte[] message, byte[] associatedData) throws CryptoException;
-
-    private static native byte[] get_session_unique(long contextPtr) throws BadHandleException;
-
-    private static native int get_sequence_number_for_encoding(long contextPtr) throws BadHandleException;
-
-    private static native int get_sequence_number_for_decoding(long contextPtr) throws BadHandleException;
-
-    private static native byte[] save_session(long contextPtr) throws BadHandleException;
-
-    private static native long from_saved_session(byte[] savedSessionInfo);
-
-    private final long contextPtr;
-
-    /**
-     * Java wrapper for D2DConnectionContextV1 to interact with the underlying Rust implementation
-     *
-     * @param contextPtr the handle to the Rust implementation.
-     */
-    D2DConnectionContextV1(@Nonnull long contextPtr) {
-        this.contextPtr = contextPtr;
-    }
-
-    /**
-     * Encode a message to the connection peer using session keys derived from the handshake.
-     *
-     * @param payload The message to be encrypted.
-     * @return The encrypted/encoded message.
-     */
-     @Nonnull
-    public byte[] encodeMessageToPeer(@Nonnull byte[] payload, @Nullable byte[] associatedData) throws BadHandleException {
-        return encode_message_to_peer(contextPtr, payload, associatedData);
-    }
-
-    /**
-     * Decodes/decrypts a message from the connection peer.
-     *
-     * @param message The message received over the connection.
-     * @return The decoded message from the connection peer.
-     */
-     @Nonnull
-    public byte[] decodeMessageFromPeer(@Nonnull byte[] message, @Nullable byte[] associatedData) throws CryptoException {
-        return decode_message_from_peer(contextPtr, message, associatedData);
-    }
-
-    /**
-     * A unique session identifier derived from session-specific information
-     *
-     * @return The session unique identifier
-     */
-     @Nonnull
-    public  byte[] getSessionUnique() throws BadHandleException {
-        return get_session_unique(contextPtr);
-    }
-
-    /**
-     * Returns the encoding sequence number.
-     *
-     * @return the encoding sequence number.
-     */
-    public int getSequenceNumberForEncoding() throws BadHandleException {
-        return get_sequence_number_for_encoding(contextPtr);
-    }
-
-    /**
-     * Returns the decoding sequence number.
-     *
-     * @return the decoding sequence number.
-     */
-    public int getSequenceNumberForDecoding() throws BadHandleException {
-        return get_sequence_number_for_decoding(contextPtr);
-    }
-
-    /**
-     * Serializes the current session in a form usable by {@link D2DConnectionContextV1#fromSavedSession}
-     *
-     * @return a byte array representing the current session.
-     */
-     @Nonnull
-    public byte[] saveSession() throws BadHandleException {
-        return save_session(contextPtr);
-    }
-
-    /**
-     * Reconstructs and returns the session originally serialized by {@link D2DConnectionContextV1#saveSession}
-     *
-     * @param savedSessionInfo the byte array from saveSession()
-     * @return a D2DConnectionContextV1 session with the same properties as the context saved.
-     */
-    public static D2DConnectionContextV1 fromSavedSession(@Nonnull byte[] savedSessionInfo) {
-        return new D2DConnectionContextV1(from_saved_session(savedSessionInfo));
-    }
-
-}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DHandshakeContext.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DHandshakeContext.java
deleted file mode 100644
index 39f7aa9..0000000
--- a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/D2DHandshakeContext.java
+++ /dev/null

@@ -1,122 +0,0 @@
-/*
- * 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.
- */
-
-package com.google.security.cryptauth.lib.securegcm;
-
-import javax.annotation.Nonnull;
-
-public class D2DHandshakeContext {
-    static {
-        System.loadLibrary("ukey2_jni");
-    }
-
-    public enum Role {
-        INITIATOR,
-        RESPONDER,
-    }
-
-    private final long contextPtr;
-
-    private static native boolean is_handshake_complete(long contextPtr) throws BadHandleException;
-
-    private static native long create_context(boolean isClient);
-
-    private static native byte[] get_next_handshake_message(long contextPtr) throws BadHandleException;
-
-    private static native void parse_handshake_message(long contextPtr, byte[] message) throws BadHandleException, HandshakeException;
-
-    private static native byte[] get_verification_string(long contextPtr, int length) throws BadHandleException, HandshakeException;
-
-    private static native long to_connection_context(long contextPtr) throws HandshakeException;
-
-    public D2DHandshakeContext(@Nonnull Role role) {
-        this.contextPtr = create_context(role == Role.INITIATOR);
-    }
-
-    /**
-     * Convenience constructor that creates a UKEY2 D2DHandshakeContext for the initiator role.
-     *
-     * @return a D2DHandshakeContext for the role of initiator in the handshake.
-     */
-    public static D2DHandshakeContext forInitiator() {
-        return new D2DHandshakeContext(Role.INITIATOR);
-    }
-
-    /**
-     * Convenience constructor that creates a UKEY2 D2DHandshakeContext for the initiator role.
-     *
-     * @return a D2DHandshakeContext for the role of responder/server in the handshake.
-     */
-    public static D2DHandshakeContext forResponder() {
-        return new D2DHandshakeContext(Role.RESPONDER);
-    }
-
-    /**
-     * Function that checks if the handshake is completed.
-     *
-     * @return true/false depending on if the handshake is complete.
-     */
-    public boolean isHandshakeComplete() throws BadHandleException {
-        return is_handshake_complete(contextPtr);
-    }
-
-    /**
-     * Gets the next handshake message in the exchange.
-     *
-     * @return handshake message encoded in a SecureMessage.
-     */
-    @Nonnull
-    public byte[] getNextHandshakeMessage() throws BadHandleException {
-        return get_next_handshake_message(contextPtr);
-    }
-
-    /**
-     * Parses the handshake message.
-     *
-     * @param message - handshake message from the other side.
-     */
-    @Nonnull
-    public void parseHandshakeMessage(@Nonnull byte[] message) throws BadHandleException, HandshakeException {
-        parse_handshake_message(contextPtr, message);
-    }
-
-    /**
-     * Returns an authentication string suitable for authenticating the handshake out-of-band. Note
-     * that the authentication string can be short (e.g., a 6 digit visual confirmation code). Note:
-     * this should only be called when {#isHandshakeComplete} returns true.
-     * This code is analogous to the authentication string described in the spec.
-     *
-     * @param length - The length of the returned verification string.
-     * @return - The returned verification string as a byte array.
-     * @throws BadHandleException - Thrown if the handle is no longer valid, for example after calling {@link D2DHandshakeContext#toConnectionContext}
-     * @throws HandshakeException - Thrown if the handshake is not complete when this function is called.
-     */
-    @Nonnull
-    public byte[] getVerificationString(int length) throws BadHandleException, HandshakeException {
-        return get_verification_string(contextPtr, length);
-    }
-
-    /**
-     * Function to create a secure communication channel from the handshake after confirming the auth string generated by
-     * the handshake out-of-band (i.e. via a user-facing UI).
-     *
-     * @return a new {@link D2DConnectionContextV1} with the next protocol specified when creating the D2DHandshakeContext.
-     * @throws HandshakeException if the handsshake is not complete when this function is called.
-     */
-    public D2DConnectionContextV1 toConnectionContext() throws HandshakeException {
-        return new D2DConnectionContextV1(to_connection_context(contextPtr));
-    }
-}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/HandshakeException.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/HandshakeException.java
deleted file mode 100644
index 17928e9..0000000
--- a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/HandshakeException.java
+++ /dev/null

@@ -1,32 +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
-//
-//     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.
-
-package com.google.security.cryptauth.lib.securegcm;
-
-/**
- * Represents an unrecoverable error that has occurred during the handshake procedure.
- */
-public class HandshakeException extends Exception {
-    public HandshakeException(String message) {
-        super(message);
-    }
-
-    public HandshakeException(Exception e) {
-        super(e);
-    }
-
-    public HandshakeException(String message, Exception e) {
-        super(message, e);
-    }
-}
\ No newline at end of file

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/AlertException.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/AlertException.java
new file mode 100644
index 0000000..bab017d
--- /dev/null
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/AlertException.java

@@ -0,0 +1,36 @@
+// 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.
+
+package com.google.security.cryptauth.lib.securegcm.ukey2;
+
+/**
+ * An alert exception that contains the alert message to send to the connection peer in case
+ * anything went wrong.
+ */
+public class AlertException extends Exception {
+
+  private final byte[] alertMessageToSend;
+
+  public AlertException(String message, byte[] alertMessageToSend) {
+    super(message);
+    this.alertMessageToSend = alertMessageToSend;
+  }
+
+  /**
+   * @return a message suitable for sending to other member of handshake.
+   */
+  public byte[] getAlertMessageToSend() {
+    return alertMessageToSend;
+  }
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/BadHandleException.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException.java
similarity index 89%
rename from nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/BadHandleException.java
rename to nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException.java
index 2efd7c4..78f0e5e 100644
--- a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/BadHandleException.java
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException.java

@@ -12,10 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.security.cryptauth.lib.securegcm;
+package com.google.security.cryptauth.lib.securegcm.ukey2;
 
 /**
- * Represents an unrecoverable error (invalid handle) that has occurred during the handshake/connection.
+ * Represents an unrecoverable error (invalid handle) that has occurred during the
+ * handshake/connection.
  */
 public class BadHandleException extends Exception {
   public BadHandleException(String message) {
@@ -29,4 +30,4 @@
   public BadHandleException(String message, Exception e) {
     super(message, e);
   }
-}
\ No newline at end of file
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/CryptoException.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/CryptoException.java
similarity index 84%
rename from nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/CryptoException.java
rename to nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/CryptoException.java
index 6abeb53..11b5c9b 100644
--- a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/CryptoException.java
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/CryptoException.java

@@ -12,11 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.security.cryptauth.lib.securegcm;
+package com.google.security.cryptauth.lib.securegcm.ukey2;
 
-/**
- * Represents an unrecoverable error that has occurred during the handshake procedure.
- */
+/** Represents an unrecoverable error that has occurred during the handshake procedure. */
 public class CryptoException extends Exception {
   public CryptoException(String message) {
     super(message);
@@ -29,4 +27,4 @@
   public CryptoException(String message, Exception e) {
     super(message, e);
   }
-}
\ No newline at end of file
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/D2DConnectionContextV1.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/D2DConnectionContextV1.java
new file mode 100644
index 0000000..9ce2517
--- /dev/null
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/D2DConnectionContextV1.java

@@ -0,0 +1,139 @@
+/*
+ * 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.
+ */
+
+package com.google.security.cryptauth.lib.securegcm.ukey2;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+public class D2DConnectionContextV1 {
+
+  static {
+    var path = System.getProperty("java.library.path");
+
+    if (path == null) {
+      throw new RuntimeException("Path isn't set.");
+    }
+
+    var paths = java.util.List.of(path.split(";"));
+    paths.forEach(System.out::println);
+
+    System.loadLibrary("ukey2_jni");
+  }
+
+  private static native byte[] encode_message_to_peer(
+      long contextPtr, byte[] payload, byte[] associatedData) throws BadHandleException;
+
+  private static native byte[] decode_message_from_peer(
+      long contextPtr, byte[] message, byte[] associatedData) throws CryptoException;
+
+  private static native byte[] get_session_unique(long contextPtr) throws BadHandleException;
+
+  private static native int get_sequence_number_for_encoding(long contextPtr)
+      throws BadHandleException;
+
+  private static native int get_sequence_number_for_decoding(long contextPtr)
+      throws BadHandleException;
+
+  private static native byte[] save_session(long contextPtr) throws BadHandleException;
+
+  private static native long from_saved_session(byte[] savedSessionInfo);
+
+  private final long contextPtr;
+
+  /**
+   * Java wrapper for D2DConnectionContextV1 to interact with the underlying Rust implementation
+   *
+   * @param contextPtr the handle to the Rust implementation.
+   */
+  D2DConnectionContextV1(@Nonnull long contextPtr) {
+    this.contextPtr = contextPtr;
+  }
+
+  /**
+   * Encode a message to the connection peer using session keys derived from the handshake.
+   *
+   * @param payload The message to be encrypted.
+   * @return The encrypted/encoded message.
+   */
+  @Nonnull
+  public byte[] encodeMessageToPeer(@Nonnull byte[] payload, @Nullable byte[] associatedData)
+      throws BadHandleException {
+    return encode_message_to_peer(contextPtr, payload, associatedData);
+  }
+
+  /**
+   * Decodes/decrypts a message from the connection peer.
+   *
+   * @param message The message received over the connection.
+   * @return The decoded message from the connection peer.
+   */
+  @Nonnull
+  public byte[] decodeMessageFromPeer(@Nonnull byte[] message, @Nullable byte[] associatedData)
+      throws CryptoException {
+    return decode_message_from_peer(contextPtr, message, associatedData);
+  }
+
+  /**
+   * A unique session identifier derived from session-specific information
+   *
+   * @return The session unique identifier
+   */
+  @Nonnull
+  public byte[] getSessionUnique() throws BadHandleException {
+    return get_session_unique(contextPtr);
+  }
+
+  /**
+   * Returns the encoding sequence number.
+   *
+   * @return the encoding sequence number.
+   */
+  public int getSequenceNumberForEncoding() throws BadHandleException {
+    return get_sequence_number_for_encoding(contextPtr);
+  }
+
+  /**
+   * Returns the decoding sequence number.
+   *
+   * @return the decoding sequence number.
+   */
+  public int getSequenceNumberForDecoding() throws BadHandleException {
+    return get_sequence_number_for_decoding(contextPtr);
+  }
+
+  /**
+   * Serializes the current session in a form usable by {@link
+   * D2DConnectionContextV1#fromSavedSession}
+   *
+   * @return a byte array representing the current session.
+   */
+  @Nonnull
+  public byte[] saveSession() throws BadHandleException {
+    return save_session(contextPtr);
+  }
+
+  /**
+   * Reconstructs and returns the session originally serialized by {@link
+   * D2DConnectionContextV1#saveSession}
+   *
+   * @param savedSessionInfo the byte array from saveSession()
+   * @return a D2DConnectionContextV1 session with the same properties as the context saved.
+   */
+  public static D2DConnectionContextV1 fromSavedSession(@Nonnull byte[] savedSessionInfo) {
+    return new D2DConnectionContextV1(from_saved_session(savedSessionInfo));
+  }
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/D2DHandshakeContext.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/D2DHandshakeContext.java
new file mode 100644
index 0000000..0e1ad62
--- /dev/null
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/D2DHandshakeContext.java

@@ -0,0 +1,134 @@
+/*
+ * 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.
+ */
+
+package com.google.security.cryptauth.lib.securegcm.ukey2;
+
+import javax.annotation.Nonnull;
+
+public class D2DHandshakeContext {
+  static {
+    System.loadLibrary("ukey2_jni");
+  }
+
+  public enum Role {
+    INITIATOR,
+    RESPONDER,
+  }
+
+  private final long contextPtr;
+
+  private static native boolean is_handshake_complete(long contextPtr) throws BadHandleException;
+
+  private static native long create_context(boolean isClient);
+
+  private static native byte[] get_next_handshake_message(long contextPtr)
+      throws BadHandleException;
+
+  private static native void parse_handshake_message(long contextPtr, byte[] message)
+      throws AlertException, BadHandleException, HandshakeException;
+
+  private static native byte[] get_verification_string(long contextPtr, int length)
+      throws BadHandleException, HandshakeException;
+
+  private static native long to_connection_context(long contextPtr) throws HandshakeException;
+
+  public D2DHandshakeContext(@Nonnull Role role) {
+    this.contextPtr = create_context(role == Role.INITIATOR);
+  }
+
+  /**
+   * Convenience constructor that creates a UKEY2 D2DHandshakeContext for the initiator role.
+   *
+   * @return a D2DHandshakeContext for the role of initiator in the handshake.
+   */
+  public static D2DHandshakeContext forInitiator() {
+    return new D2DHandshakeContext(Role.INITIATOR);
+  }
+
+  /**
+   * Convenience constructor that creates a UKEY2 D2DHandshakeContext for the initiator role.
+   *
+   * @return a D2DHandshakeContext for the role of responder/server in the handshake.
+   */
+  public static D2DHandshakeContext forResponder() {
+    return new D2DHandshakeContext(Role.RESPONDER);
+  }
+
+  /**
+   * Function that checks if the handshake is completed.
+   *
+   * @return true/false depending on if the handshake is complete.
+   */
+  public boolean isHandshakeComplete() throws BadHandleException {
+    return is_handshake_complete(contextPtr);
+  }
+
+  /**
+   * Gets the next handshake message in the exchange.
+   *
+   * @return handshake message encoded in a SecureMessage.
+   */
+  @Nonnull
+  public byte[] getNextHandshakeMessage() throws BadHandleException {
+    return get_next_handshake_message(contextPtr);
+  }
+
+  /**
+   * Parses the handshake message.
+   *
+   * @param message - handshake message from the other side.
+   * @throws AlertException - Thrown if the message is unable to be parsed.
+   * @throws BadHandleException - Thrown if the handle is no longer valid, for example after calling
+   *     {@link D2DHandshakeContext#toConnectionContext()}
+   * @throws HandshakeException - Thrown if the handshake is not complete when this function is
+   *     called.
+   */
+  @Nonnull
+  public void parseHandshakeMessage(@Nonnull byte[] message)
+      throws AlertException, BadHandleException, HandshakeException {
+    parse_handshake_message(contextPtr, message);
+  }
+
+  /**
+   * Returns an authentication string suitable for authenticating the handshake out-of-band. Note
+   * that the authentication string can be short (e.g., a 6 digit visual confirmation code). Note:
+   * this should only be called when {#isHandshakeComplete} returns true. This code is analogous to
+   * the authentication string described in the spec.
+   *
+   * @param length - The length of the returned verification string.
+   * @return - The returned verification string as a byte array.
+   * @throws BadHandleException - Thrown if the handle is no longer valid, for example after calling
+   *     {@link D2DHandshakeContext#toConnectionContext()}
+   * @throws HandshakeException - Thrown if the handshake is not complete when this function is
+   *     called.
+   */
+  @Nonnull
+  public byte[] getVerificationString(int length) throws BadHandleException, HandshakeException {
+    return get_verification_string(contextPtr, length);
+  }
+
+  /**
+   * Function to create a secure communication channel from the handshake after confirming the auth
+   * string generated by the handshake out-of-band (i.e. via a user-facing UI).
+   *
+   * @return a new {@link D2DConnectionContextV1} with the next protocol specified when creating the
+   *     D2DHandshakeContext.
+   * @throws HandshakeException if the handsshake is not complete when this function is called.
+   */
+  public D2DConnectionContextV1 toConnectionContext() throws HandshakeException {
+    return new D2DConnectionContextV1(to_connection_context(contextPtr));
+  }
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/CryptoException.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/HandshakeException.java
similarity index 65%
copy from nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/CryptoException.java
copy to nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/HandshakeException.java
index 6abeb53..20d3112 100644
--- a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/CryptoException.java
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/HandshakeException.java

@@ -12,21 +12,19 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.security.cryptauth.lib.securegcm;
+package com.google.security.cryptauth.lib.securegcm.ukey2;
 
-/**
- * Represents an unrecoverable error that has occurred during the handshake procedure.
- */
-public class CryptoException extends Exception {
-  public CryptoException(String message) {
+/** Represents an unrecoverable error that has occurred during the handshake procedure. */
+public class HandshakeException extends Exception {
+  public HandshakeException(String message) {
     super(message);
   }
 
-  public CryptoException(Exception e) {
+  public HandshakeException(Exception e) {
     super(e);
   }
 
-  public CryptoException(String message, Exception e) {
+  public HandshakeException(String message, Exception e) {
     super(message, e);
   }
-}
\ No newline at end of file
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/SessionRestoreException.java b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/SessionRestoreException.java
similarity index 85%
rename from nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/SessionRestoreException.java
rename to nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/SessionRestoreException.java
index c780973..026f8c5 100644
--- a/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/SessionRestoreException.java
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/main/java/com/google/security/cryptauth/lib/securegcm/ukey2/SessionRestoreException.java

@@ -12,11 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.security.cryptauth.lib.securegcm;
+package com.google.security.cryptauth.lib.securegcm.ukey2;
 
-/**
- * Represents an unrecoverable error that has occurred during the handshake procedure.
- */
+/** Represents an unrecoverable error that has occurred during the handshake procedure. */
 public class SessionRestoreException extends Exception {
   public SessionRestoreException(String message) {
     super(message);
@@ -29,4 +27,4 @@
   public SessionRestoreException(String message, Exception e) {
     super(message, e);
   }
-}
\ No newline at end of file
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/test/java/com/google/security/cryptauth/lib/securegcm/TestUkey2Protocol.kt b/nearby/connections/ukey2/ukey2_jni/java/src/test/java/com/google/security/cryptauth/lib/securegcm/TestUkey2Protocol.kt
deleted file mode 100644
index 79cbd15..0000000
--- a/nearby/connections/ukey2/ukey2_jni/java/src/test/java/com/google/security/cryptauth/lib/securegcm/TestUkey2Protocol.kt
+++ /dev/null

@@ -1,182 +0,0 @@
-/*
- * 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.
- */
-
-/*
- * This Java source file was generated by the Gradle 'init' task.
- */
-package com.google.security.cryptauth.lib.securegcm
-
-import java.nio.charset.StandardCharsets
-import org.junit.jupiter.api.Assertions.assertArrayEquals
-import org.junit.jupiter.api.Assertions.assertEquals
-import org.junit.jupiter.api.Assertions.assertFalse
-import org.junit.jupiter.api.Assertions.assertNotEquals
-import org.junit.jupiter.api.Assertions.assertTrue
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.assertDoesNotThrow
-import org.junit.jupiter.api.assertThrows
-
-// Driver code
-// Tests exception handling and the handshake routine, as well as encrypting/decrypting short message between the server and initiator contexts.
-@Suppress("UNUSED_VARIABLE")
-class TestUkey2Protocol {
-    @Test
-    fun testHandshake() {
-        val initiatorContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
-        assertFalse(initiatorContext.isHandshakeComplete)
-        val serverContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
-        assertFalse(serverContext.isHandshakeComplete)
-        assertDoesNotThrow {
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            assertTrue(initiatorContext.isHandshakeComplete)
-            assertTrue(serverContext.isHandshakeComplete)
-        }
-    }
-
-    @Test
-    fun testSendReceiveMessage() {
-        val initiatorContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
-        val serverContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
-        assertDoesNotThrow {
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            val connContext = initiatorContext.toConnectionContext()
-            val serverConnContext = serverContext.toConnectionContext()
-            val initialShareString = "Nearby sharing to server"
-            val encoded = connContext.encodeMessageToPeer(
-                initialShareString.toByteArray(
-                    StandardCharsets.UTF_8
-                ), null
-            )
-            val response =
-                String(serverConnContext.decodeMessageFromPeer(encoded, null), StandardCharsets.UTF_8)
-            assertEquals(response, initialShareString)
-        }
-    }
-
-    @Test
-    fun testSaveRestoreSession() {
-        val initiatorContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
-        val serverContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
-        assertDoesNotThrow {
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            val connContext = initiatorContext.toConnectionContext()
-            val serverConnContext = serverContext.toConnectionContext()
-            val initiatorSavedSession = connContext.saveSession()
-            val restored = D2DConnectionContextV1.fromSavedSession(initiatorSavedSession)
-            assertArrayEquals(connContext.sessionUnique, restored.sessionUnique)
-            val initialShareString = "Nearby sharing to server"
-            val encoded = serverConnContext.encodeMessageToPeer(
-                initialShareString.toByteArray(
-                    StandardCharsets.UTF_8
-                ), null
-            )
-            val response = String(restored.decodeMessageFromPeer(encoded, null), StandardCharsets.UTF_8)
-            assertEquals(response, initialShareString)
-        }
-    }
-
-    @Test
-    fun testSaveRestoreBadSession() {
-        val initiatorContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
-        val serverContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
-        val deriveInitiatorSavedSession = {
-            assertDoesNotThrow {
-                serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-                initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
-                serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-                val connContext = initiatorContext.toConnectionContext()
-                val serverConnContext = serverContext.toConnectionContext()
-                connContext.saveSession()
-            }
-        }
-        assertThrows<SessionRestoreException> {
-            val unused = D2DConnectionContextV1.fromSavedSession(deriveInitiatorSavedSession().copyOfRange(0, 20))
-        }
-    }
-
-    @Test
-    fun tryReuseHandshakeContext() {
-        val initiatorContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
-        val serverContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
-        assertDoesNotThrow {
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            val connContext = initiatorContext.toConnectionContext()
-            val serverConnContext = serverContext.toConnectionContext()
-        }
-        assertThrows<BadHandleException> {
-            val unused = serverContext.nextHandshakeMessage
-        }
-    }
-
-    @Test
-    fun testSendReceiveMessageWithAssociatedData() {
-        val initiatorContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
-        val serverContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
-        val associatedData = "Associated data.".toByteArray()
-        assertDoesNotThrow {
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            val connContext = initiatorContext.toConnectionContext()
-            val serverConnContext = serverContext.toConnectionContext()
-            val initialShareString = "Nearby sharing to server"
-            val encoded = connContext.encodeMessageToPeer(
-                initialShareString.toByteArray(
-                    StandardCharsets.UTF_8
-                ), associatedData
-            )
-            val response =
-                String(serverConnContext.decodeMessageFromPeer(encoded, associatedData), StandardCharsets.UTF_8)
-            assertEquals(response, initialShareString)
-        }
-    }
-
-    @Test
-    fun testVerificationString() {
-        val initiatorContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
-        val serverContext =
-            D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
-        assertDoesNotThrow {
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-            initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
-            serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
-        }
-        assert(serverContext.isHandshakeComplete)
-        assert(initiatorContext.isHandshakeComplete)
-        assertArrayEquals(serverContext.getVerificationString(32), initiatorContext.getVerificationString(32))
-    }
-}
\ No newline at end of file

diff --git a/nearby/connections/ukey2/ukey2_jni/java/src/test/java/com/google/security/cryptauth/lib/securegcm/ukey2/TestUkey2Protocol.kt b/nearby/connections/ukey2/ukey2_jni/java/src/test/java/com/google/security/cryptauth/lib/securegcm/ukey2/TestUkey2Protocol.kt
new file mode 100644
index 0000000..2940652
--- /dev/null
+++ b/nearby/connections/ukey2/ukey2_jni/java/src/test/java/com/google/security/cryptauth/lib/securegcm/ukey2/TestUkey2Protocol.kt

@@ -0,0 +1,175 @@
+/*
+ * 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.
+ */
+
+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package com.google.security.cryptauth.lib.securegcm.ukey2
+
+import java.nio.charset.StandardCharsets
+import org.junit.jupiter.api.Assertions.assertArrayEquals
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertDoesNotThrow
+import org.junit.jupiter.api.assertThrows
+
+// Driver code
+// Tests exception handling and the handshake routine, as well as encrypting/decrypting short
+// message between the server and initiator contexts.
+@Suppress("UNUSED_VARIABLE")
+class TestUkey2Protocol {
+  @Test
+  fun testHandshake() {
+    val initiatorContext = D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
+    assertFalse(initiatorContext.isHandshakeComplete)
+    val serverContext = D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
+    assertFalse(serverContext.isHandshakeComplete)
+    assertDoesNotThrow {
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      assertTrue(initiatorContext.isHandshakeComplete)
+      assertTrue(serverContext.isHandshakeComplete)
+    }
+  }
+
+  @Test
+  fun testSendReceiveMessage() {
+    val initiatorContext = D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
+    val serverContext = D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
+    assertDoesNotThrow {
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      val connContext = initiatorContext.toConnectionContext()
+      val serverConnContext = serverContext.toConnectionContext()
+      val initialShareString = "Nearby sharing to server"
+      val encoded =
+          connContext.encodeMessageToPeer(
+              initialShareString.toByteArray(StandardCharsets.UTF_8), null)
+      val response =
+          String(serverConnContext.decodeMessageFromPeer(encoded, null), StandardCharsets.UTF_8)
+      assertEquals(response, initialShareString)
+    }
+  }
+
+  @Test
+  fun testSaveRestoreSession() {
+    val initiatorContext = D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
+    val serverContext = D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
+    assertDoesNotThrow {
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      val connContext = initiatorContext.toConnectionContext()
+      val serverConnContext = serverContext.toConnectionContext()
+      val initiatorSavedSession = connContext.saveSession()
+      val restored = D2DConnectionContextV1.fromSavedSession(initiatorSavedSession)
+      assertArrayEquals(connContext.sessionUnique, restored.sessionUnique)
+      val initialShareString = "Nearby sharing to server"
+      val encoded =
+          serverConnContext.encodeMessageToPeer(
+              initialShareString.toByteArray(StandardCharsets.UTF_8), null)
+      val response = String(restored.decodeMessageFromPeer(encoded, null), StandardCharsets.UTF_8)
+      assertEquals(response, initialShareString)
+    }
+  }
+
+  @Test
+  fun testSaveRestoreBadSession() {
+    val initiatorContext = D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
+    val serverContext = D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
+    val deriveInitiatorSavedSession = {
+      assertDoesNotThrow {
+        serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+        initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
+        serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+        val connContext = initiatorContext.toConnectionContext()
+        val serverConnContext = serverContext.toConnectionContext()
+        connContext.saveSession()
+      }
+    }
+    assertThrows<SessionRestoreException> {
+      val unused =
+          D2DConnectionContextV1.fromSavedSession(deriveInitiatorSavedSession().copyOfRange(0, 20))
+    }
+  }
+
+  @Test
+  fun tryReuseHandshakeContext() {
+    val initiatorContext = D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
+    val serverContext = D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
+    assertDoesNotThrow {
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      val connContext = initiatorContext.toConnectionContext()
+      val serverConnContext = serverContext.toConnectionContext()
+    }
+    assertThrows<BadHandleException> {
+      val unused = serverContext.nextHandshakeMessage
+    }
+  }
+
+  @Test
+  fun testSendReceiveMessageWithAssociatedData() {
+    val initiatorContext = D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
+    val serverContext = D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
+    val associatedData = "Associated data.".toByteArray()
+    assertDoesNotThrow {
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      val connContext = initiatorContext.toConnectionContext()
+      val serverConnContext = serverContext.toConnectionContext()
+      val initialShareString = "Nearby sharing to server"
+      val encoded =
+          connContext.encodeMessageToPeer(
+              initialShareString.toByteArray(StandardCharsets.UTF_8), associatedData)
+      val response =
+          String(
+              serverConnContext.decodeMessageFromPeer(encoded, associatedData),
+              StandardCharsets.UTF_8)
+      assertEquals(response, initialShareString)
+    }
+  }
+
+  @Test
+  fun testVerificationString() {
+    val initiatorContext = D2DHandshakeContext(D2DHandshakeContext.Role.INITIATOR)
+    val serverContext = D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
+    assertDoesNotThrow {
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+      initiatorContext.parseHandshakeMessage(serverContext.nextHandshakeMessage)
+      serverContext.parseHandshakeMessage(initiatorContext.nextHandshakeMessage)
+    }
+    assert(serverContext.isHandshakeComplete)
+    assert(initiatorContext.isHandshakeComplete)
+    assertArrayEquals(
+        serverContext.getVerificationString(32), initiatorContext.getVerificationString(32))
+  }
+
+  @Test
+  fun throwsAlertExceptionWhenBadMessage() {
+    val serverContext = D2DHandshakeContext(D2DHandshakeContext.Role.RESPONDER)
+    val exception = assertThrows<AlertException> {
+      serverContext.parseHandshakeMessage("Hello UKEY2".toByteArray())
+    }
+    assert(exception.alertMessageToSend.isNotEmpty())
+  }
+}

diff --git a/nearby/connections/ukey2/ukey2_jni/src/lib.rs b/nearby/connections/ukey2/ukey2_jni/src/lib.rs
index b7764fa..2b277aa 100644
--- a/nearby/connections/ukey2/ukey2_jni/src/lib.rs
+++ b/nearby/connections/ukey2/ukey2_jni/src/lib.rs

@@ -20,7 +20,7 @@
 
 use std::collections::HashMap;
 
-use jni::objects::{JByteArray, JClass};
+use jni::objects::{JByteArray, JClass, JThrowable};
 use jni::sys::{jboolean, jbyteArray, jint, jlong, JNI_TRUE};
 use jni::JNIEnv;
 use lazy_static::lazy_static;
@@ -59,12 +59,12 @@
 
 pub(crate) fn insert_handshake_handle(item: D2DBox) -> u64 {
     let mut handle = generate_handle();
-    let map = HANDLE_MAPPING.lock();
+    let mut map = HANDLE_MAPPING.lock();
     while map.contains_key(&handle) {
         handle = generate_handle();
     }
 
-    let result = HANDLE_MAPPING.lock().insert(handle, item);
+    let result = map.insert(handle, item);
     // result should always be None since we checked that handle map does not contain the key already
     assert!(result.is_none());
     handle
@@ -72,12 +72,12 @@
 
 pub(crate) fn insert_conn_handle(item: ConnectionBox) -> u64 {
     let mut handle = generate_handle();
-    let map = CONNECTION_HANDLE_MAPPING.lock();
+    let mut map = CONNECTION_HANDLE_MAPPING.lock();
     while map.contains_key(&handle) {
         handle = generate_handle();
     }
 
-    let result = CONNECTION_HANDLE_MAPPING.lock().insert(handle, item);
+    let result = map.insert(handle, item);
     // result should always be None since we checked that handle map does not contain the key already
     assert!(result.is_none());
     handle
@@ -94,7 +94,7 @@
 /// Tells the caller whether the handshake has completed or not. If the handshake is complete,
 /// the caller may call `to_connection_context`to obtain a connection context.
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DHandshakeContext_is_1handshake_1complete(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DHandshakeContext_is_1handshake_1complete(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -103,7 +103,7 @@
     if let Some(ctx) = HANDLE_MAPPING.lock().get(&(context_handle as u64)) {
         is_complete = ctx.is_handshake_complete();
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
     }
     is_complete as jboolean
@@ -111,7 +111,7 @@
 
 /// Creates a new handshake context
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DHandshakeContext_create_1context(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DHandshakeContext_create_1context(
     _: JNIEnv,
     _: JClass,
     is_client: jboolean,
@@ -131,7 +131,7 @@
 
 /// Constructs the next message that should be sent in the handshake.
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DHandshakeContext_get_1next_1handshake_1message(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DHandshakeContext_get_1next_1handshake_1message(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -140,7 +140,7 @@
     let next_message = if let Some(ctx) = HANDLE_MAPPING.lock().get(&(context_handle as u64)) {
         ctx.get_next_handshake_message()
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
         None
     };
@@ -157,7 +157,7 @@
 // Safety: We know the message pointer is safe as it is coming directly from the JVM.
 #[allow(clippy::not_unsafe_ptr_arg_deref)]
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DHandshakeContext_parse_1handshake_1message(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DHandshakeContext_parse_1handshake_1message(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -167,22 +167,48 @@
     let result = if let Some(ctx) = HANDLE_MAPPING.lock().get_mut(&(context_handle as u64)) {
         ctx.handle_handshake_message(rust_buffer.as_slice()).map_err(JniError::HandleMessageError)
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
         Err(JniError::BadHandle)
     };
     if let Err(e) = result {
         if !env.exception_check().unwrap() {
-            env.throw_new(
-                "com/google/security/cryptauth/lib/securegcm/HandshakeException",
+            let msg =
                 match e {
                     JniError::BadHandle => "Bad handle",
                     JniError::DecodeError(_) => "Unable to decode message",
-                    JniError::HandleMessageError(_) => "Unable to handle message",
+                    JniError::HandleMessageError(hme) => match hme {
+                        HandleMessageError::InvalidState | HandleMessageError::BadMessage => {
+                            "Unable to handle message"
+                        }
+                        HandleMessageError::ErrorMessage(error_msg) => {
+                            let exception: JThrowable = env.new_object(
+                            "com/google/security/cryptauth/lib/securegcm/ukey2/AlertException",
+                            "(Ljava/lang/String;[B)V",
+                            &[
+                                (&env
+                                    .new_string("Failed to handle message, sending alert")
+                                    .expect("valid str message for alert exception"))
+                                    .into(),
+                                (&env
+                                    .byte_array_from_slice(&error_msg)
+                                    .expect("valid byte array for alert exception"))
+                                    .into(),
+                            ],
+                        ).expect("Did not successfully create AlertException").into();
+                            env.throw(exception).expect("Throw alert exception");
+                            ""
+                        }
+                    },
                     JniError::HandshakeError(_) => "Handshake incomplete",
-                },
-            )
-            .expect("failed to find error class");
+                };
+            if !env.exception_check().unwrap() {
+                env.throw_new(
+                    "com/google/security/cryptauth/lib/securegcm/ukey2/HandshakeException",
+                    msg,
+                )
+                .expect("failed to find error class");
+            }
         }
     }
 }
@@ -190,7 +216,7 @@
 /// Returns the `CompletedHandshake` using the results from this handshake context. May only
 /// be called if `is_handshake_complete` returns true.
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DHandshakeContext_get_1verification_1string(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DHandshakeContext_get_1verification_1string(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -202,14 +228,14 @@
             .map_err(|_| JniError::HandshakeError(HandshakeError::HandshakeNotComplete))
             .map(|h| h.auth_string::<CryptoProvider>().derive_vec(length as usize).unwrap())
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
         Err(JniError::BadHandle)
     };
     if let Err(e) = result {
         if !env.exception_check().unwrap() {
             env.throw_new(
-                "com/google/security/cryptauth/lib/securegcm/HandshakeException",
+                "com/google/security/cryptauth/lib/securegcm/ukey2/HandshakeException",
                 match e {
                     JniError::BadHandle => "Bad handle",
                     JniError::DecodeError(_) => "Unable to decode message",
@@ -230,7 +256,7 @@
 /// Creates a [`D2DConnectionContextV1`] using the results of the handshake. May only be called
 /// if `is_handshake_complete` returns true.
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DHandshakeContext_to_1connection_1context(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DHandshakeContext_to_1connection_1context(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -242,7 +268,7 @@
     };
     if let Err(error) = conn_context {
         env.throw_new(
-            "com/google/security/cryptauth/lib/securegcm/HandshakeException",
+            "com/google/security/cryptauth/lib/securegcm/ukey2/HandshakeException",
             match error {
                 JniError::BadHandle => "Bad context handle",
                 JniError::HandshakeError(_) => "Handshake not complete",
@@ -263,7 +289,7 @@
 // from the JVM.
 #[allow(clippy::not_unsafe_ptr_arg_deref)]
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DConnectionContextV1_encode_1message_1to_1peer(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DConnectionContextV1_encode_1message_1to_1peer(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -293,7 +319,7 @@
     if let Ok(ret_vec) = result {
         env.byte_array_from_slice(ret_vec.as_slice()).expect("unable to create jByteArray")
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
         empty_array
     }
@@ -307,7 +333,7 @@
 // from the JVM.
 #[allow(clippy::not_unsafe_ptr_arg_deref)]
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DConnectionContextV1_decode_1message_1from_1peer(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DConnectionContextV1_decode_1message_1from_1peer(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -337,7 +363,7 @@
         env.byte_array_from_slice(message.as_slice()).expect("unable to create jByteArray")
     } else {
         env.throw_new(
-            "com/google/security/cryptauth/lib/securegcm/CryptoException",
+            "com/google/security/cryptauth/lib/securegcm/ukey2/CryptoException",
             match result.unwrap_err() {
                 JniError::BadHandle => "Bad context handle",
                 JniError::DecodeError(e) => match e {
@@ -356,7 +382,7 @@
 
 /// Returns the last sequence number used to encode a message.
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DConnectionContextV1_get_1sequence_1number_1for_1encoding(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DConnectionContextV1_get_1sequence_1number_1for_1encoding(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -364,7 +390,7 @@
     if let Some(ctx) = CONNECTION_HANDLE_MAPPING.lock().get(&(context_handle as u64)) {
         ctx.get_sequence_number_for_encoding()
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
         -1
     }
@@ -372,7 +398,7 @@
 
 /// Returns the last sequence number used to decode a message.
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DConnectionContextV1_get_1sequence_1number_1for_1decoding(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DConnectionContextV1_get_1sequence_1number_1for_1decoding(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -380,7 +406,7 @@
     if let Some(ctx) = CONNECTION_HANDLE_MAPPING.lock().get(&(context_handle as u64)) {
         ctx.get_sequence_number_for_decoding()
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
         -1
     }
@@ -389,7 +415,7 @@
 /// Creates a saved session that can later be used for resumption. The session data may be
 /// persisted, but it must be stored in a secure location.
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DConnectionContextV1_save_1session(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DConnectionContextV1_save_1session(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -398,7 +424,7 @@
     if let Some(ctx) = CONNECTION_HANDLE_MAPPING.lock().get(&(context_handle as u64)) {
         env.byte_array_from_slice(ctx.save_session().as_slice()).expect("unable to save session")
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
         empty_array
     }
@@ -409,7 +435,7 @@
 // Safety: We know the session_info pointer is safe because it is coming directly from the JVM.
 #[no_mangle]
 #[allow(clippy::not_unsafe_ptr_arg_deref)]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DConnectionContextV1_from_1saved_1session(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DConnectionContextV1_from_1saved_1session(
     mut env: JNIEnv,
     _: JClass,
     session_info: jbyteArray,
@@ -421,7 +447,7 @@
         D2DConnectionContextV1::from_saved_session::<CryptoProvider>(session_info_rust.as_slice());
     if ctx.is_err() {
         env.throw_new(
-            "com/google/security/cryptauth/lib/securegcm/SessionRestoreException",
+            "com/google/security/cryptauth/lib/securegcm/ukey2/SessionRestoreException",
             match ctx.err().unwrap() {
                 DeserializeError::BadDataLength => "DeserializeError: bad session_info length",
                 DeserializeError::BadProtocolVersion => "DeserializeError: bad protocol version",
@@ -440,7 +466,7 @@
 /// of the ASCII string "D2D". Since the server and client share the same session keys, the
 /// resulting session unique is also the same.
 #[no_mangle]
-pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_D2DConnectionContextV1_get_1session_1unique(
+pub extern "system" fn Java_com_google_security_cryptauth_lib_securegcm_ukey2_D2DConnectionContextV1_get_1session_1unique(
     mut env: JNIEnv,
     _: JClass,
     context_handle: jlong,
@@ -450,7 +476,7 @@
         env.byte_array_from_slice(ctx.get_session_unique::<CryptoProvider>().as_slice())
             .expect("unable to get unique session id")
     } else {
-        env.throw_new("com/google/security/cryptauth/lib/securegcm/BadHandleException", "")
+        env.throw_new("com/google/security/cryptauth/lib/securegcm/ukey2/BadHandleException", "")
             .expect("failed to find error class");
         empty_array
     }

diff --git a/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/device_to_device_messages.rs b/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/device_to_device_messages.rs
index 3c2da35..fb44c51 100644
--- a/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/device_to_device_messages.rs
+++ b/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/device_to_device_messages.rs

@@ -1,4 +1,4 @@
-// Copyright 2023 Google LLC
+// Copyright 2024 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -13,7 +13,7 @@
 // limitations under the License.
 
 // This file is generated by rust-protobuf 3.2.0. Do not edit
-// .proto file is parsed by protoc 3.19.1
+// .proto file is parsed by protoc 3.21.12
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702

diff --git a/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/securegcm.rs b/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/securegcm.rs
index 3231440..3ba20e0 100644
--- a/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/securegcm.rs
+++ b/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/securegcm.rs

@@ -1,4 +1,4 @@
-// Copyright 2023 Google LLC
+// Copyright 2024 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -13,7 +13,7 @@
 // limitations under the License.
 
 // This file is generated by rust-protobuf 3.2.0. Do not edit
-// .proto file is parsed by protoc 3.19.1
+// .proto file is parsed by protoc 3.21.12
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702

diff --git a/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/securemessage.rs b/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/securemessage.rs
index 161e0be..d11c330 100644
--- a/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/securemessage.rs
+++ b/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/securemessage.rs

@@ -1,4 +1,4 @@
-// Copyright 2023 Google LLC
+// Copyright 2024 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -13,7 +13,7 @@
 // limitations under the License.
 
 // This file is generated by rust-protobuf 3.2.0. Do not edit
-// .proto file is parsed by protoc 3.19.1
+// .proto file is parsed by protoc 3.21.12
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702

diff --git a/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/ukey.rs b/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/ukey.rs
index 5370207..4535937 100644
--- a/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/ukey.rs
+++ b/nearby/connections/ukey2/ukey2_proto/src/ukey2_all_proto/ukey.rs

@@ -1,4 +1,4 @@
-// Copyright 2023 Google LLC
+// Copyright 2024 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -13,7 +13,7 @@
 // limitations under the License.
 
 // This file is generated by rust-protobuf 3.2.0. Do not edit
-// .proto file is parsed by protoc 3.19.1
+// .proto file is parsed by protoc 3.21.12
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702

diff --git a/nearby/connections/ukey2/ukey2_shell/Cargo.toml b/nearby/connections/ukey2/ukey2_shell/Cargo.toml
index 9a2856d..2ac12fa 100644
--- a/nearby/connections/ukey2/ukey2_shell/Cargo.toml
+++ b/nearby/connections/ukey2/ukey2_shell/Cargo.toml

@@ -11,4 +11,4 @@
 crypto_provider_rustcrypto = { workspace = true, features = [ "alloc" ] }
 ukey2_rs = { version = "0.1.0", path = "../ukey2" }
 ukey2_connections = { version = "0.1.0", path = "../ukey2_connections" }
-clap = { version = "4.0.17", default-features = false, features = ["std", "derive"] }
+clap = { workspace = true, features = ["std", "derive"] }

diff --git a/nearby/crypto/README.md b/nearby/crypto/README.md
index 4cb65be..698a954 100644
--- a/nearby/crypto/README.md
+++ b/nearby/crypto/README.md

@@ -1,7 +1,7 @@
 # What is this?
 
 A crypto provider that abstracts over different crypto implementations, mainly the Rust
-implementations by [RustCrypto](https://github.com/RustCrypto), OpenSSL and BoringSSL.
+implementations by [RustCrypto](https://github.com/RustCrypto) and BoringSSL.
 
 ## Project structure
 
@@ -11,7 +11,7 @@
 like AES, SHA2, X25519 and P256 ECDH, HKDF, HMAC, etc.
 
 Two implementations are currently provided, `crypto_provider_rustcrypto` and
-`crypto_provider_openssl`.
+`crypto_provider_boringssl`.
 
 #### `crypto_provider::aes`
 Abstraction on top plain AES, including AES-CTR and AES-CBC.
@@ -26,25 +26,11 @@
 Implementations of `crypto_provider` types using the convenient pure-Rust primitives
 from [Rust Crypto](https://github.com/RustCrypto).
 
-### `crypto_provider_openssl`
+### `crypto_provider_boringssl`
 
 Implementations of `crypto_provider` types using the
-[openSSL Rust crate](https://github.com/sfackler/rust-openssl), which is a Rust
-wrapper for openSSL.
-
-#### Using BoringSSL
-
-`crypto_provider_openssl` can also be made to use BoringSSL via the `boringssl` feature. This
-translates to using the `openssl` and `openssl-sys` crates' `unstable_boringssl` feature. Since the
-depenedency `bssl-sys` is not on crates.io, to test the BoringSSL integration, you'll need to run
-`cargo run -- build-boringssl`, which clones BoringSSL. Then, to use the Android version of
-`rust-openssl`, run `cargo run -- prepare-rust-openssl`.
-
-* Run `cargo run -- build-boringssl` to setup the workspace
-* Run `cargo --config=.cargo/config-boringssl.toml test --features=boringssl` to test the crypto
-  provider implementations.
-* Run `cargo --config=.cargo/config-boringssl.toml run -p <package> --features=openssl,boringssl
-  --no-default-features` on FFI, JNI, or shell targets to make them use BoringSSL.
+[bssl-crypto](https://boringssl.googlesource.com/boringssl/+/master/rust/bssl-crypto), which is a
+Rust binding layer for BoringSSL.
 
 ## Setup
 

diff --git a/nearby/crypto/crypto_provider/Cargo.toml b/nearby/crypto/crypto_provider/Cargo.toml
index 1a588bb..a31f5fa 100644
--- a/nearby/crypto/crypto_provider/Cargo.toml
+++ b/nearby/crypto/crypto_provider/Cargo.toml

@@ -13,8 +13,7 @@
 [dev-dependencies]
 criterion.workspace = true
 hex-literal.workspace = true
-crypto_provider_openssl.workspace = true
-crypto_provider_rustcrypto = { workspace = true, features = ["std"] }
+crypto_provider_default = { workspace = true, features = ["std"]}
 rand_ext.workspace = true
 rand.workspace = true
 
@@ -23,6 +22,7 @@
 std = []
 alloc = []
 test_vectors = []
+test_boringssl = ["crypto_provider_default/boringssl"]
 raw_private_key_permit = []
 
 [[bench]]

diff --git a/nearby/crypto/crypto_provider/benches/constant_time_eq_bench.rs b/nearby/crypto/crypto_provider/benches/constant_time_eq_bench.rs
index 70c65cf..3859616 100644
--- a/nearby/crypto/crypto_provider/benches/constant_time_eq_bench.rs
+++ b/nearby/crypto/crypto_provider/benches/constant_time_eq_bench.rs

@@ -18,8 +18,7 @@
     criterion_group, criterion_main, measurement::WallTime, BatchSize, BenchmarkGroup, Criterion,
 };
 use crypto_provider::CryptoProvider;
-use crypto_provider_openssl::Openssl;
-use crypto_provider_rustcrypto::RustCrypto;
+use crypto_provider_default::CryptoProviderImpl;
 use rand::{distributions::Standard, rngs::ThreadRng, Rng};
 
 fn constant_time_eq_equals(c: &mut Criterion) {
@@ -57,8 +56,7 @@
         }
     }
 
-    add_benches::<RustCrypto>(&mut group, &mut rng);
-    add_benches::<Openssl>(&mut group, &mut rng);
+    add_benches::<CryptoProviderImpl>(&mut group, &mut rng);
 }
 
 criterion_group!(benches, constant_time_eq_equals);

diff --git a/nearby/crypto/crypto_provider/benches/hkdf_bench.rs b/nearby/crypto/crypto_provider/benches/hkdf_bench.rs
index e73f8cf..6464c7e 100644
--- a/nearby/crypto/crypto_provider/benches/hkdf_bench.rs
+++ b/nearby/crypto/crypto_provider/benches/hkdf_bench.rs

@@ -19,8 +19,7 @@
 
 use crypto_provider::hkdf::Hkdf;
 use crypto_provider::CryptoProvider;
-use crypto_provider_openssl::Openssl;
-use crypto_provider_rustcrypto::RustCrypto;
+use crypto_provider_default::CryptoProviderImpl;
 
 // simple benchmark, which creates a new hmac, updates once, then finalizes
 fn hkdf_sha256_operations<C: CryptoProvider>(c: &mut Criterion) {
@@ -46,6 +45,6 @@
     });
 }
 
-criterion_group!(benches, hkdf_sha256_operations::<RustCrypto>, hkdf_sha256_operations::<Openssl>,);
+criterion_group!(benches, hkdf_sha256_operations::<CryptoProviderImpl>);
 
 criterion_main!(benches);

diff --git a/nearby/crypto/crypto_provider/benches/hmac_bench.rs b/nearby/crypto/crypto_provider/benches/hmac_bench.rs
index 9bcfde0..0d856d4 100644
--- a/nearby/crypto/crypto_provider/benches/hmac_bench.rs
+++ b/nearby/crypto/crypto_provider/benches/hmac_bench.rs

@@ -18,8 +18,7 @@
 
 use crypto_provider::hmac::Hmac;
 use crypto_provider::{CryptoProvider, CryptoRng};
-use crypto_provider_openssl::Openssl;
-use crypto_provider_rustcrypto::RustCrypto;
+use crypto_provider_default::CryptoProviderImpl;
 use rand_ext::random_bytes;
 
 // simple benchmark, which creates a new hmac, updates once, then finalizes
@@ -53,10 +52,8 @@
 
 criterion_group!(
     benches,
-    hmac_sha256_operations::<RustCrypto>,
-    hmac_sha256_operations::<Openssl>,
-    hmac_sha512_operations::<RustCrypto>,
-    hmac_sha512_operations::<Openssl>
+    hmac_sha256_operations::<CryptoProviderImpl>,
+    hmac_sha512_operations::<CryptoProviderImpl>,
 );
 
 criterion_main!(benches);

diff --git a/nearby/crypto/crypto_provider/src/aes/mod.rs b/nearby/crypto/crypto_provider/src/aes/mod.rs
index e359bad..b3dbd6a 100644
--- a/nearby/crypto/crypto_provider/src/aes/mod.rs
+++ b/nearby/crypto/crypto_provider/src/aes/mod.rs

@@ -15,7 +15,7 @@
 //! An abstraction layer around AES implementations.
 //!
 //! The design is an attempt to make it easy to provide implementations that are both idiomatic
-//! Rust (e.g. RustCrypto) as well as FFI-backed (e.g. openssl and other C impls).
+//! Rust (e.g. RustCrypto) as well as FFI-backed (e.g. boringSSL and other C impls).
 use core::{array, fmt};
 
 pub mod ctr;

diff --git a/nearby/crypto/crypto_provider/src/ed25519.rs b/nearby/crypto/crypto_provider/src/ed25519.rs
index b435ca2..7002335 100644
--- a/nearby/crypto/crypto_provider/src/ed25519.rs
+++ b/nearby/crypto/crypto_provider/src/ed25519.rs

@@ -166,7 +166,7 @@
 
     /// Builds this public key from an array of bytes in
     /// the format yielded by `to_bytes`.
-    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidBytes>
+    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidPublicKeyBytes>
     where
         Self: Sized;
 
@@ -183,7 +183,7 @@
 
 /// error returned when bad bytes are provided to generate keypair
 #[derive(Debug)]
-pub struct InvalidBytes;
+pub struct InvalidPublicKeyBytes;
 
 /// Error returned if the verification on the signature + message fails
 #[derive(Debug)]

diff --git a/nearby/crypto/crypto_provider_boringssl/Cargo.lock b/nearby/crypto/crypto_provider_boringssl/Cargo.lock
index 7773e56..432c546 100644
--- a/nearby/crypto/crypto_provider_boringssl/Cargo.lock
+++ b/nearby/crypto/crypto_provider_boringssl/Cargo.lock

@@ -3,6 +3,15 @@
 version = 3
 
 [[package]]
+name = "aho-corasick"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
 name = "base64"
 version = "0.21.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -10,7 +19,7 @@
 
 [[package]]
 name = "bssl-crypto"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "bssl-sys",
 ]
@@ -68,6 +77,12 @@
 ]
 
 [[package]]
+name = "glob"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"
+
+[[package]]
 name = "hex"
 version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -98,6 +113,12 @@
 checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
+name = "memchr"
+version = "2.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "523dc4f511e55ab87b694dc30d0f820d60906ef06413f93d4d7a1385599cc149"
+
+[[package]]
 name = "ppv-lite86"
 version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -105,18 +126,18 @@
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "2de98502f212cfcea8d0bb305bd0f49d7ebdd75b64ba0a68f937d888f4e0d6db"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.33"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -171,10 +192,45 @@
 ]
 
 [[package]]
-name = "rstest"
-version = "0.17.0"
+name = "regex"
+version = "1.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de1bb486a691878cd320c2f0d319ba91eeaa2e894066d8b5f8f117c000e9d962"
+checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
+
+[[package]]
+name = "relative-path"
+version = "1.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e898588f33fdd5b9420719948f9f2a32c922a246964576f71ba7f24f80610fbc"
+
+[[package]]
+name = "rstest"
+version = "0.18.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97eeab2f3c0a199bc4be135c36c924b6590b88c377d416494288c14f2db30199"
 dependencies = [
  "rstest_macros",
  "rustc_version",
@@ -182,15 +238,18 @@
 
 [[package]]
 name = "rstest_macros"
-version = "0.17.0"
+version = "0.18.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "290ca1a1c8ca7edb7c3283bd44dc35dd54fdec6253a3912e201ba1072018fca8"
+checksum = "d428f8247852f894ee1be110b375111b586d4fa431f6c46e64ba5a0dcccbe605"
 dependencies = [
  "cfg-if",
+ "glob",
  "proc-macro2",
  "quote",
+ "regex",
+ "relative-path",
  "rustc_version",
- "syn 1.0.109",
+ "syn",
  "unicode-ident",
 ]
 
@@ -203,7 +262,7 @@
  "quote",
  "rand",
  "rustc_version",
- "syn 2.0.29",
+ "syn",
 ]
 
 [[package]]
@@ -229,29 +288,29 @@
 
 [[package]]
 name = "serde"
-version = "1.0.187"
+version = "1.0.194"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30a7fe14252655bd1e578af19f5fa00fe02fd0013b100ca6b49fde31c41bae4c"
+checksum = "0b114498256798c94a0689e1a15fec6005dee8ac1f41de56404b67afc2a4b773"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.187"
+version = "1.0.194"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e46b2a6ca578b3f1d4501b12f78ed4692006d79d82a1a7c561c12dbc3d625eb8"
+checksum = "a3385e45322e8f9931410f01b3031ec534c3947d0e94c18049af4d9f9907d4e0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.105"
+version = "1.0.110"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "693151e1ac27563d6dbcec9dee9fbd5da8539b20fa14ad3752b2e6d363ace360"
+checksum = "6fbd975230bada99c8bb618e0c365c2eefa219158d5c6c29610fd09ff1833257"
 dependencies = [
  "itoa",
  "ryu",
@@ -260,20 +319,9 @@
 
 [[package]]
 name = "syn"
-version = "1.0.109"
+version = "2.0.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
-[[package]]
-name = "syn"
-version = "2.0.29"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c324c494eba9d92503e6f1ef2e6df781e78f6a7705a0202d9801b198807d518a"
+checksum = "89456b690ff72fddcecf231caedbe615c59480c93358a93dfae7fc29e3ebbf0e"
 dependencies = [
  "proc-macro2",
  "quote",

diff --git a/nearby/crypto/crypto_provider_boringssl/src/aead/aes_gcm.rs b/nearby/crypto/crypto_provider_boringssl/src/aead/aes_gcm.rs
index 03bb087..75fb385 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/aead/aes_gcm.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/aead/aes_gcm.rs

@@ -19,52 +19,89 @@
 use crypto_provider::aead::{Aead, AeadError, AeadInit};
 use crypto_provider::aes::{Aes128Key, Aes256Key, AesKey};
 
-pub struct AesGcm(bssl_crypto::aead::AesGcm);
+pub struct AesGcm128(bssl_crypto::aead::Aes128Gcm);
 
-impl AeadInit<Aes128Key> for AesGcm {
+pub struct AesGcm256(bssl_crypto::aead::Aes256Gcm);
+
+impl AeadInit<Aes128Key> for AesGcm128 {
     fn new(key: &Aes128Key) -> Self {
-        Self(bssl_crypto::aead::new_aes_128_gcm(key.as_array()))
+        Self(bssl_crypto::aead::Aes128Gcm::new(key.as_array()))
     }
 }
 
-impl AeadInit<Aes256Key> for AesGcm {
-    fn new(key: &Aes256Key) -> Self {
-        Self(bssl_crypto::aead::new_aes_256_gcm(key.as_array()))
-    }
-}
+impl crypto_provider::aead::AesGcm for AesGcm128 {}
 
-impl crypto_provider::aead::AesGcm for AesGcm {}
-
-impl Aead for AesGcm {
+impl Aead for AesGcm128 {
     const TAG_SIZE: usize = 16;
     type Nonce = [u8; 12];
     type Tag = [u8; 16];
 
     fn encrypt(&self, msg: &[u8], aad: &[u8], nonce: &Self::Nonce) -> Result<Vec<u8>, AeadError> {
-        self.0.encrypt(msg, aad, nonce).map_err(|_| AeadError)
+        Ok(self.0.seal(nonce, msg, aad))
     }
 
     fn encrypt_detached(
         &self,
-        _msg: &mut [u8],
-        _aad: &[u8],
-        _nonce: &Self::Nonce,
+        msg: &mut [u8],
+        aad: &[u8],
+        nonce: &Self::Nonce,
     ) -> Result<Self::Tag, AeadError> {
-        unimplemented!("Not yet supported by boringssl")
+        Ok(self.0.seal_in_place(nonce, msg, aad))
     }
 
     fn decrypt(&self, msg: &[u8], aad: &[u8], nonce: &Self::Nonce) -> Result<Vec<u8>, AeadError> {
-        self.0.decrypt(msg, aad, nonce).map_err(|_| AeadError)
+        self.0.open(nonce, msg, aad).ok_or(AeadError)
     }
 
     fn decrypt_detached(
         &self,
-        _msg: &mut [u8],
-        _aad: &[u8],
-        _nonce: &Self::Nonce,
-        _tag: &Self::Tag,
+        msg: &mut [u8],
+        aad: &[u8],
+        nonce: &Self::Nonce,
+        tag: &Self::Tag,
     ) -> Result<(), AeadError> {
-        unimplemented!("Not yet supported by boringssl")
+        self.0.open_in_place(nonce, msg, tag, aad).map_err(|_| AeadError)
+    }
+}
+
+impl AeadInit<Aes256Key> for AesGcm256 {
+    fn new(key: &Aes256Key) -> Self {
+        Self(bssl_crypto::aead::Aes256Gcm::new(key.as_array()))
+    }
+}
+
+impl crypto_provider::aead::AesGcm for AesGcm256 {}
+
+impl Aead for AesGcm256 {
+    const TAG_SIZE: usize = 16;
+    type Nonce = [u8; 12];
+    type Tag = [u8; 16];
+
+    fn encrypt(&self, msg: &[u8], aad: &[u8], nonce: &Self::Nonce) -> Result<Vec<u8>, AeadError> {
+        Ok(self.0.seal(nonce, msg, aad))
+    }
+
+    fn encrypt_detached(
+        &self,
+        msg: &mut [u8],
+        aad: &[u8],
+        nonce: &Self::Nonce,
+    ) -> Result<Self::Tag, AeadError> {
+        Ok(self.0.seal_in_place(nonce, msg, aad))
+    }
+
+    fn decrypt(&self, msg: &[u8], aad: &[u8], nonce: &Self::Nonce) -> Result<Vec<u8>, AeadError> {
+        self.0.open(nonce, msg, aad).ok_or(AeadError)
+    }
+
+    fn decrypt_detached(
+        &self,
+        msg: &mut [u8],
+        aad: &[u8],
+        nonce: &Self::Nonce,
+        tag: &Self::Tag,
+    ) -> Result<(), AeadError> {
+        self.0.open_in_place(nonce, msg, tag, aad).map_err(|_| AeadError)
     }
 }
 
@@ -78,12 +115,12 @@
     use super::*;
 
     #[apply(aes_128_gcm_test_cases)]
-    fn aes_gcm_128_test(testcase: CryptoProviderTestCase<AesGcm>) {
+    fn aes_gcm_128_test(testcase: CryptoProviderTestCase<AesGcm128>) {
         testcase(PhantomData);
     }
 
     #[apply(aes_256_gcm_test_cases)]
-    fn aes_gcm_256_test(testcase: CryptoProviderTestCase<AesGcm>) {
+    fn aes_gcm_256_test(testcase: CryptoProviderTestCase<AesGcm256>) {
         testcase(PhantomData);
     }
 }

diff --git a/nearby/crypto/crypto_provider_boringssl/src/aead/aes_gcm_siv.rs b/nearby/crypto/crypto_provider_boringssl/src/aead/aes_gcm_siv.rs
index d1fb0e7..ac26c43 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/aead/aes_gcm_siv.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/aead/aes_gcm_siv.rs

@@ -18,52 +18,89 @@
 use crypto_provider::aead::{Aead, AeadError, AeadInit};
 use crypto_provider::aes::{Aes128Key, Aes256Key, AesKey};
 
-pub struct AesGcmSiv(bssl_crypto::aead::AesGcmSiv);
+pub struct AesGcmSiv128(bssl_crypto::aead::Aes128GcmSiv);
 
-impl AeadInit<Aes128Key> for AesGcmSiv {
+impl AeadInit<Aes128Key> for AesGcmSiv128 {
     fn new(key: &Aes128Key) -> Self {
-        Self(bssl_crypto::aead::new_aes_128_gcm_siv(key.as_array()))
+        Self(bssl_crypto::aead::Aes128GcmSiv::new(key.as_array()))
     }
 }
 
-impl AeadInit<Aes256Key> for AesGcmSiv {
-    fn new(key: &Aes256Key) -> Self {
-        Self(bssl_crypto::aead::new_aes_256_gcm_siv(key.as_array()))
-    }
-}
+impl crypto_provider::aead::AesGcmSiv for AesGcmSiv128 {}
 
-impl crypto_provider::aead::AesGcmSiv for AesGcmSiv {}
-
-impl Aead for AesGcmSiv {
+impl Aead for AesGcmSiv128 {
     const TAG_SIZE: usize = 16;
     type Nonce = [u8; 12];
     type Tag = [u8; 16];
 
     fn encrypt(&self, msg: &[u8], aad: &[u8], nonce: &Self::Nonce) -> Result<Vec<u8>, AeadError> {
-        self.0.encrypt(msg, aad, nonce).map_err(|_| AeadError)
+        Ok(self.0.seal(nonce, msg, aad))
     }
 
     fn encrypt_detached(
         &self,
-        _msg: &mut [u8],
-        _aad: &[u8],
-        _nonce: &Self::Nonce,
+        msg: &mut [u8],
+        aad: &[u8],
+        nonce: &Self::Nonce,
     ) -> Result<Self::Tag, AeadError> {
-        unimplemented!("Not yet supported by boringssl")
+        Ok(self.0.seal_in_place(nonce, msg, aad))
     }
 
     fn decrypt(&self, msg: &[u8], aad: &[u8], nonce: &Self::Nonce) -> Result<Vec<u8>, AeadError> {
-        self.0.decrypt(msg, aad, nonce).map_err(|_| AeadError)
+        self.0.open(nonce, msg, aad).ok_or(AeadError)
     }
 
     fn decrypt_detached(
         &self,
-        _msg: &mut [u8],
-        _aad: &[u8],
-        _nonce: &Self::Nonce,
-        _tag: &Self::Tag,
+        msg: &mut [u8],
+        aad: &[u8],
+        nonce: &Self::Nonce,
+        tag: &Self::Tag,
     ) -> Result<(), AeadError> {
-        unimplemented!("Not yet supported by boringssl")
+        self.0.open_in_place(nonce, msg, tag, aad).map_err(|_| AeadError)
+    }
+}
+
+pub struct AesGcmSiv256(bssl_crypto::aead::Aes256GcmSiv);
+
+impl AeadInit<Aes256Key> for AesGcmSiv256 {
+    fn new(key: &Aes256Key) -> Self {
+        Self(bssl_crypto::aead::Aes256GcmSiv::new(key.as_array()))
+    }
+}
+
+impl crypto_provider::aead::AesGcmSiv for AesGcmSiv256 {}
+
+impl Aead for AesGcmSiv256 {
+    const TAG_SIZE: usize = 16;
+    type Nonce = [u8; 12];
+    type Tag = [u8; 16];
+
+    fn encrypt(&self, msg: &[u8], aad: &[u8], nonce: &Self::Nonce) -> Result<Vec<u8>, AeadError> {
+        Ok(self.0.seal(nonce, msg, aad))
+    }
+
+    fn encrypt_detached(
+        &self,
+        msg: &mut [u8],
+        aad: &[u8],
+        nonce: &Self::Nonce,
+    ) -> Result<Self::Tag, AeadError> {
+        Ok(self.0.seal_in_place(nonce, msg, aad))
+    }
+
+    fn decrypt(&self, msg: &[u8], aad: &[u8], nonce: &Self::Nonce) -> Result<Vec<u8>, AeadError> {
+        self.0.open(nonce, msg, aad).ok_or(AeadError)
+    }
+
+    fn decrypt_detached(
+        &self,
+        msg: &mut [u8],
+        aad: &[u8],
+        nonce: &Self::Nonce,
+        tag: &Self::Tag,
+    ) -> Result<(), AeadError> {
+        self.0.open_in_place(nonce, msg, tag, aad).map_err(|_| AeadError)
     }
 }
 
@@ -77,12 +114,12 @@
     use super::*;
 
     #[apply(aes_128_gcm_siv_test_cases)]
-    fn aes_gcm_siv_128_test(testcase: CryptoProviderTestCase<AesGcmSiv>) {
+    fn aes_gcm_siv_128_test(testcase: CryptoProviderTestCase<AesGcmSiv128>) {
         testcase(PhantomData);
     }
 
     #[apply(aes_256_gcm_siv_test_cases)]
-    fn aes_gcm_siv_256_test(testcase: CryptoProviderTestCase<AesGcmSiv>) {
+    fn aes_gcm_siv_256_test(testcase: CryptoProviderTestCase<AesGcmSiv256>) {
         testcase(PhantomData);
     }
 }

diff --git a/nearby/crypto/crypto_provider_boringssl/src/aes/mod.rs b/nearby/crypto/crypto_provider_boringssl/src/aes/mod.rs
index d5cbe58..d9f3315 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/aes/mod.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/aes/mod.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use bssl_crypto::aes::{AesDecryptKey, AesEncryptKey};
+use bssl_crypto::aes::{DecryptKey, EncryptKey};
 use crypto_provider::aes::{
     Aes, Aes128Key, Aes256Key, AesBlock, AesCipher, AesDecryptCipher, AesEncryptCipher, AesKey,
 };
@@ -40,28 +40,28 @@
 }
 
 /// A BoringSSL backed AES-128 Encryption Cipher
-pub struct Aes128EncryptCipher(AesEncryptKey);
+pub struct Aes128EncryptCipher(EncryptKey);
 
 /// A BoringSSL backed AES-128 Decryption Cipher
-pub struct Aes128DecryptCipher(AesDecryptKey);
+pub struct Aes128DecryptCipher(DecryptKey);
 
 /// A BoringSSL backed AES-256 Encryption Cipher
-pub struct Aes256EncryptCipher(AesEncryptKey);
+pub struct Aes256EncryptCipher(EncryptKey);
 
 /// A BoringSSL backed AES-256 Decryption Cipher
-pub struct Aes256DecryptCipher(AesDecryptKey);
+pub struct Aes256DecryptCipher(DecryptKey);
 
 impl AesCipher for Aes128EncryptCipher {
     type Key = Aes128Key;
 
     fn new(key: &Self::Key) -> Self {
-        Self(bssl_crypto::aes::AesEncryptKey::new_aes_128(*key.as_array()))
+        Self(EncryptKey::new_128(key.as_array()))
     }
 }
 
 impl AesEncryptCipher for Aes128EncryptCipher {
     fn encrypt(&self, block: &mut AesBlock) {
-        bssl_crypto::aes::Aes::encrypt(&self.0, block)
+        self.0.encrypt_in_place(block)
     }
 }
 
@@ -69,13 +69,13 @@
     type Key = Aes128Key;
 
     fn new(key: &Self::Key) -> Self {
-        Self(bssl_crypto::aes::AesDecryptKey::new_aes_128(*key.as_array()))
+        Self(DecryptKey::new_128(key.as_array()))
     }
 }
 
 impl AesDecryptCipher for Aes128DecryptCipher {
     fn decrypt(&self, block: &mut AesBlock) {
-        bssl_crypto::aes::Aes::decrypt(&self.0, block)
+        self.0.decrypt_in_place(block)
     }
 }
 
@@ -83,13 +83,13 @@
     type Key = Aes256Key;
 
     fn new(key: &Self::Key) -> Self {
-        Self(bssl_crypto::aes::AesEncryptKey::new_aes_256(*key.as_array()))
+        Self(EncryptKey::new_256(key.as_array()))
     }
 }
 
 impl AesEncryptCipher for Aes256EncryptCipher {
     fn encrypt(&self, block: &mut AesBlock) {
-        bssl_crypto::aes::Aes::encrypt(&self.0, block)
+        self.0.encrypt_in_place(block)
     }
 }
 
@@ -97,13 +97,13 @@
     type Key = Aes256Key;
 
     fn new(key: &Self::Key) -> Self {
-        Self(bssl_crypto::aes::AesDecryptKey::new_aes_256(*key.as_array()))
+        Self(DecryptKey::new_256(key.as_array()))
     }
 }
 
 impl AesDecryptCipher for Aes256DecryptCipher {
     fn decrypt(&self, block: &mut AesBlock) {
-        bssl_crypto::aes::Aes::decrypt(&self.0, block)
+        self.0.decrypt_in_place(block)
     }
 }
 

diff --git a/nearby/crypto/crypto_provider_boringssl/src/ed25519.rs b/nearby/crypto/crypto_provider_boringssl/src/ed25519.rs
index b5c374a..e411df1 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/ed25519.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/ed25519.rs

@@ -13,8 +13,8 @@
 // limitations under the License.
 
 use crypto_provider::ed25519::{
-    InvalidBytes, RawPrivateKey, RawPrivateKeyPermit, RawPublicKey, RawSignature, Signature as _,
-    SignatureError,
+    InvalidPublicKeyBytes, RawPrivateKey, RawPrivateKeyPermit, RawPublicKey, RawSignature,
+    Signature as _, SignatureError,
 };
 
 pub struct Ed25519;
@@ -39,7 +39,7 @@
     where
         Self: Sized,
     {
-        let private_key = bssl_crypto::ed25519::PrivateKey::new_from_seed(bytes);
+        let private_key = bssl_crypto::ed25519::PrivateKey::from_seed(bytes);
         Self(private_key)
     }
 
@@ -52,7 +52,7 @@
     }
 
     fn public(&self) -> Self::PublicKey {
-        PublicKey(self.0.public())
+        PublicKey(self.0.to_public())
     }
 }
 
@@ -60,11 +60,11 @@
 
 impl crypto_provider::ed25519::Signature for Signature {
     fn from_bytes(bytes: &RawSignature) -> Self {
-        Self(bssl_crypto::ed25519::Signature::from_bytes(*bytes))
+        Self(bssl_crypto::ed25519::Signature::from(*bytes))
     }
 
     fn to_bytes(&self) -> RawSignature {
-        self.0.to_bytes()
+        self.0
     }
 }
 
@@ -73,15 +73,15 @@
 impl crypto_provider::ed25519::PublicKey for PublicKey {
     type Signature = Signature;
 
-    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidBytes>
+    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidPublicKeyBytes>
     where
         Self: Sized,
     {
-        Ok(Self(bssl_crypto::ed25519::PublicKey::from_bytes(*bytes)))
+        Ok(Self(bssl_crypto::ed25519::PublicKey::from_bytes(bytes)))
     }
 
     fn to_bytes(&self) -> RawPublicKey {
-        self.0.to_bytes()
+        *self.0.as_bytes()
     }
 
     fn verify_strict(
@@ -90,7 +90,7 @@
         signature: &Self::Signature,
     ) -> Result<(), SignatureError> {
         self.0
-            .verify(message, bssl_crypto::ed25519::Signature::from_bytes(signature.to_bytes()))
+            .verify(message, &bssl_crypto::ed25519::Signature::from(signature.to_bytes()))
             .map_err(|_| SignatureError)
     }
 }

diff --git a/nearby/crypto/crypto_provider_boringssl/src/hkdf.rs b/nearby/crypto/crypto_provider_boringssl/src/hkdf.rs
index c162d3d..7b01a2c 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/hkdf.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/hkdf.rs

@@ -18,15 +18,21 @@
 //! See the _Using BoringSSL_ section in `crypto/README.md` for instructions on
 //! how to test against BoringSSL, or see the subcommands in the top level crate.
 
-use bssl_crypto::digest::Md;
+use bssl_crypto::digest::Algorithm;
+use bssl_crypto::hkdf::Salt;
+use core::marker::PhantomData;
 use crypto_provider::hkdf::InvalidLength;
 
 /// Struct providing BoringSSL implemented Hkdf operations.
-pub struct Hkdf<M: Md>(bssl_crypto::hkdf::Hkdf<M>);
+pub struct Hkdf<M: Algorithm>(bssl_crypto::hkdf::Prk, PhantomData<M>);
 
-impl<M: Md> crypto_provider::hkdf::Hkdf for Hkdf<M> {
+impl<M: Algorithm> crypto_provider::hkdf::Hkdf for Hkdf<M> {
     fn new(salt: Option<&[u8]>, ikm: &[u8]) -> Self {
-        Self(bssl_crypto::hkdf::Hkdf::<M>::new(salt, ikm))
+        let bssl_salt = match salt {
+            None => Salt::None,
+            Some(raw_salt) => Salt::NonEmpty(raw_salt),
+        };
+        Self(bssl_crypto::hkdf::Hkdf::<M>::extract(ikm, bssl_salt), PhantomData)
     }
 
     fn expand_multi_info(
@@ -37,14 +43,14 @@
         if okm.is_empty() {
             return Ok(());
         }
-        self.0.expand_multi_info(info_components, okm).map_err(|_| InvalidLength)
+        self.0.expand_into(&info_components.concat(), okm).map_err(|_| InvalidLength)
     }
 
     fn expand(&self, info: &[u8], okm: &mut [u8]) -> Result<(), InvalidLength> {
         if okm.is_empty() {
             return Ok(());
         }
-        self.0.expand(info, okm).map_err(|_| InvalidLength)
+        self.0.expand_into(info, okm).map_err(|_| InvalidLength)
     }
 }
 

diff --git a/nearby/crypto/crypto_provider_boringssl/src/hmac.rs b/nearby/crypto/crypto_provider_boringssl/src/hmac.rs
index 7a5e867..53e829e 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/hmac.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/hmac.rs

@@ -19,7 +19,7 @@
 
 impl crypto_provider::hmac::Hmac<32> for HmacSha256 {
     fn new_from_key(key: [u8; 32]) -> Self {
-        Self(bssl_crypto::hmac::HmacSha256::new(key))
+        Self(bssl_crypto::hmac::HmacSha256::new(&key))
     }
 
     fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength> {
@@ -31,7 +31,7 @@
     }
 
     fn finalize(self) -> [u8; 32] {
-        self.0.finalize()
+        self.0.digest()
     }
 
     fn verify_slice(self, tag: &[u8]) -> Result<(), MacError> {
@@ -39,7 +39,7 @@
     }
 
     fn verify(self, tag: [u8; 32]) -> Result<(), MacError> {
-        self.0.verify(tag).map_err(|_| MacError)
+        self.0.verify(&tag).map_err(|_| MacError)
     }
 
     fn verify_truncated_left(self, tag: &[u8]) -> Result<(), MacError> {
@@ -52,7 +52,7 @@
 
 impl crypto_provider::hmac::Hmac<64> for HmacSha512 {
     fn new_from_key(key: [u8; 64]) -> Self {
-        Self(bssl_crypto::hmac::HmacSha512::new(key))
+        Self(bssl_crypto::hmac::HmacSha512::new(&key))
     }
 
     fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength> {
@@ -64,7 +64,7 @@
     }
 
     fn finalize(self) -> [u8; 64] {
-        self.0.finalize()
+        self.0.digest()
     }
 
     fn verify_slice(self, tag: &[u8]) -> Result<(), MacError> {
@@ -72,7 +72,7 @@
     }
 
     fn verify(self, tag: [u8; 64]) -> Result<(), MacError> {
-        self.0.verify(tag).map_err(|_| MacError)
+        self.0.verify(&tag).map_err(|_| MacError)
     }
 
     fn verify_truncated_left(self, tag: &[u8]) -> Result<(), MacError> {

diff --git a/nearby/crypto/crypto_provider_boringssl/src/lib.rs b/nearby/crypto/crypto_provider_boringssl/src/lib.rs
index 75758b6..560169a 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/lib.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/lib.rs

@@ -23,7 +23,7 @@
 
 //! Crate which provides impls for CryptoProvider backed by BoringSSL
 //!
-use bssl_crypto::rand::rand_bytes;
+use bssl_crypto::rand_bytes;
 use crypto_provider::{CryptoProvider, CryptoRng};
 
 /// Implementation of `crypto_provider::aes` types using BoringSSL
@@ -69,18 +69,18 @@
     type AesCtr128 = aes::ctr::AesCtr128;
     type AesCtr256 = aes::ctr::AesCtr256;
     type Ed25519 = ed25519::Ed25519;
-    type Aes128GcmSiv = aead::aes_gcm_siv::AesGcmSiv;
-    type Aes256GcmSiv = aead::aes_gcm_siv::AesGcmSiv;
-    type Aes128Gcm = aead::aes_gcm::AesGcm;
-    type Aes256Gcm = aead::aes_gcm::AesGcm;
+    type Aes128GcmSiv = aead::aes_gcm_siv::AesGcmSiv128;
+    type Aes256GcmSiv = aead::aes_gcm_siv::AesGcmSiv256;
+    type Aes128Gcm = aead::aes_gcm::AesGcm128;
+    type Aes256Gcm = aead::aes_gcm::AesGcm256;
     type CryptoRng = BoringSslRng;
 
     fn constant_time_eq(a: &[u8], b: &[u8]) -> bool {
-        bssl_crypto::mem::crypto_memcmp(a, b)
+        bssl_crypto::constant_time_compare(a, b)
     }
 }
 
-/// OpenSSL implemented random number generator
+/// BoringSSL implemented random number generator
 pub struct BoringSslRng;
 
 impl CryptoRng for BoringSslRng {

diff --git a/nearby/crypto/crypto_provider_boringssl/src/p256.rs b/nearby/crypto/crypto_provider_boringssl/src/p256.rs
index 7fefecd..564897b 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/p256.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/p256.rs

@@ -14,7 +14,9 @@
 
 extern crate alloc;
 
+use alloc::vec;
 use bssl_crypto::ecdh::{PrivateKey, PublicKey};
+use core::fmt::{Debug, Formatter};
 use crypto_provider::{
     elliptic_curve::{EcdhProvider, EphemeralSecret, PublicKey as _},
     p256::{PointCompression, P256},
@@ -31,13 +33,25 @@
 }
 
 /// A NIST-P256 public key.
-#[derive(Debug, PartialEq, Eq)]
-pub struct P256PublicKey(PublicKey<bssl_crypto::ecdh::P256>);
+pub struct P256PublicKey(PublicKey<bssl_crypto::ec::P256>);
+
+impl PartialEq for P256PublicKey {
+    fn eq(&self, other: &Self) -> bool {
+        self.0.to_x962_uncompressed().as_ref() == other.0.to_x962_uncompressed().as_ref()
+    }
+}
+
+impl Debug for P256PublicKey {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        write!(f, "X9.62 bytes: {:?}", self.0.to_x962_uncompressed().as_ref())
+    }
+}
+
 impl crypto_provider::p256::P256PublicKey for P256PublicKey {
-    type Error = bssl_crypto::ecdh::Error;
+    type Error = Error;
 
     fn from_sec1_bytes(bytes: &[u8]) -> Result<Self, Self::Error> {
-        PublicKey::try_from(bytes).map(Self)
+        PublicKey::from_x962_uncompressed(bytes).map(P256PublicKey).ok_or(Error::ConversionFailed)
     }
 
     fn to_sec1_bytes(&self, point_compression: PointCompression) -> ArrayVec<[u8; 65]> {
@@ -45,29 +59,37 @@
             PointCompression::Compressed => unimplemented!(),
             PointCompression::Uncompressed => {
                 let mut bytes = ArrayVec::<[u8; 65]>::new();
-                bytes.extend_from_slice(&self.0.to_vec());
+                bytes.extend_from_slice(self.0.to_x962_uncompressed().as_ref());
                 bytes
             }
         }
     }
 
-    #[allow(clippy::expect_used)]
+    #[allow(clippy::expect_used, clippy::indexing_slicing)]
     fn to_affine_coordinates(&self) -> Result<([u8; 32], [u8; 32]), Self::Error> {
-        Ok(self.0.to_affine_coordinates())
+        let raw_key = self.0.to_x962_uncompressed();
+        let x = raw_key.as_ref()[1..33].try_into().map_err(|_| Error::ConversionFailed)?;
+        let y = raw_key.as_ref()[33..65].try_into().map_err(|_| Error::ConversionFailed)?;
+        Ok((x, y))
     }
     fn from_affine_coordinates(x: &[u8; 32], y: &[u8; 32]) -> Result<Self, Self::Error> {
-        PublicKey::<bssl_crypto::ecdh::P256>::from_affine_coordinates(x, y).map(Self)
+        let mut point = vec![0x04];
+        point.extend_from_slice(x);
+        point.extend_from_slice(y);
+        PublicKey::<bssl_crypto::ec::P256>::from_x962_uncompressed(&point)
+            .map(Self)
+            .ok_or(Error::ConversionFailed)
     }
 }
 
-/// Ephemeral secrect for use in a P256 Diffie-Hellman
+/// Ephemeral secret for use in a P256 Diffie-Hellman exchange.
 pub struct P256EphemeralSecret {
-    secret: PrivateKey<bssl_crypto::ecdh::P256>,
+    secret: PrivateKey<bssl_crypto::ec::P256>,
 }
 
 impl EphemeralSecret<P256> for P256EphemeralSecret {
     type Impl = P256Ecdh;
-    type Error = bssl_crypto::ecdh::Error;
+    type Error = Error;
     type Rng = ();
     type EncodedPublicKey =
         <P256PublicKey as crypto_provider::elliptic_curve::PublicKey<P256>>::EncodedPublicKey;
@@ -77,19 +99,27 @@
     }
 
     fn public_key_bytes(&self) -> Self::EncodedPublicKey {
-        P256PublicKey((&self.secret).into()).to_bytes()
+        P256PublicKey(self.secret.to_public_key()).to_bytes()
     }
 
     fn diffie_hellman(
         self,
         other_pub: &P256PublicKey,
     ) -> Result<<Self::Impl as EcdhProvider<P256>>::SharedSecret, Self::Error> {
-        let shared_secret = self.secret.diffie_hellman(&other_pub.0)?;
-        let bytes: <Self::Impl as EcdhProvider<P256>>::SharedSecret = shared_secret.to_bytes();
-        Ok(bytes)
+        let shared_secret = self.secret.compute_shared_key(&other_pub.0);
+        shared_secret.try_into().map_err(|_| Error::DiffieHellmanFailed)
     }
 }
 
+/// Error type for ECDH operations.
+#[derive(Debug)]
+pub enum Error {
+    /// Failed when trying to convert between representations.
+    ConversionFailed,
+    /// The Diffie-Hellman key exchange failed.
+    DiffieHellmanFailed,
+}
+
 #[cfg(test)]
 impl crypto_provider_test::elliptic_curve::EphemeralSecretForTesting<P256> for P256EphemeralSecret {
     #[allow(clippy::unwrap_used)]
@@ -97,7 +127,7 @@
         private_bytes: &[u8; 32],
         _public_key: &P256PublicKey,
     ) -> Result<Self, Self::Error> {
-        Ok(Self { secret: PrivateKey::from_private_bytes(private_bytes).unwrap() })
+        Ok(Self { secret: PrivateKey::from_big_endian(private_bytes).unwrap() })
     }
 }
 
@@ -109,7 +139,7 @@
 
     #[apply(p256_test_cases)]
     fn p256_tests(testcase: CryptoProviderTestCase<P256Ecdh>, name: &str) {
-        if name == "to_bytes_compressed" {
+        if name.contains("compressed") {
             return; // EC point compression not supported by bssl-crypto yet
         }
         testcase(PhantomData::<P256Ecdh>)

diff --git a/nearby/crypto/crypto_provider_boringssl/src/sha2.rs b/nearby/crypto/crypto_provider_boringssl/src/sha2.rs
index d95294d..fbee81d 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/sha2.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/sha2.rs

@@ -17,9 +17,9 @@
 
 impl crypto_provider::sha2::Sha256 for Sha256 {
     fn sha256(input: &[u8]) -> [u8; 32] {
-        let mut digest = bssl_crypto::digest::Sha256::new_digest();
+        let mut digest = bssl_crypto::digest::Sha256::new();
         digest.update(input);
-        digest.finalize()
+        digest.digest()
     }
 }
 
@@ -28,8 +28,8 @@
 
 impl crypto_provider::sha2::Sha512 for Sha512 {
     fn sha512(input: &[u8]) -> [u8; 64] {
-        let mut digest = bssl_crypto::digest::Sha512::new_digest();
+        let mut digest = bssl_crypto::digest::Sha512::new();
         digest.update(input);
-        digest.finalize()
+        digest.digest()
     }
 }

diff --git a/nearby/crypto/crypto_provider_boringssl/src/x25519.rs b/nearby/crypto/crypto_provider_boringssl/src/x25519.rs
index 58d040b..f8444f6 100644
--- a/nearby/crypto/crypto_provider_boringssl/src/x25519.rs
+++ b/nearby/crypto/crypto_provider_boringssl/src/x25519.rs

@@ -26,29 +26,30 @@
 
 /// A X25519 ephemeral secret used for Diffie-Hellman.
 pub struct X25519EphemeralSecret {
+    public_key: bssl_crypto::x25519::PublicKey,
     secret: bssl_crypto::x25519::PrivateKey,
 }
 
 impl EphemeralSecret<X25519> for X25519EphemeralSecret {
     type Impl = X25519Ecdh;
-    type Error = bssl_crypto::x25519::DiffieHellmanError;
+    type Error = Error;
     type Rng = ();
     type EncodedPublicKey = [u8; 32];
 
     fn generate_random(_rng: &mut Self::Rng) -> Self {
-        Self { secret: bssl_crypto::x25519::PrivateKey::generate() }
+        let key_pair = bssl_crypto::x25519::PrivateKey::generate();
+        Self { public_key: key_pair.0, secret: key_pair.1 }
     }
 
     fn public_key_bytes(&self) -> Self::EncodedPublicKey {
-        let pubkey: bssl_crypto::x25519::PublicKey = (&self.secret).into();
-        pubkey.to_bytes()
+        self.public_key
     }
 
     fn diffie_hellman(
         self,
         other_pub: &<X25519Ecdh as EcdhProvider<X25519>>::PublicKey,
     ) -> Result<<X25519Ecdh as EcdhProvider<X25519>>::SharedSecret, Self::Error> {
-        self.secret.diffie_hellman(&other_pub.0).map(|secret| secret.to_bytes())
+        self.secret.compute_shared_key(&other_pub.0).ok_or(Error::WrongSize)
     }
 }
 
@@ -58,9 +59,12 @@
 {
     fn from_private_components(
         private_bytes: &[u8; 32],
-        _public_key: &X25519PublicKey,
+        public_key: &X25519PublicKey,
     ) -> Result<Self, Self::Error> {
-        Ok(Self { secret: bssl_crypto::x25519::PrivateKey::from_private_bytes(private_bytes) })
+        Ok(Self {
+            public_key: public_key.0,
+            secret: bssl_crypto::x25519::PrivateKey(*private_bytes),
+        })
     }
 }
 
@@ -69,16 +73,16 @@
 pub struct X25519PublicKey(bssl_crypto::x25519::PublicKey);
 
 impl PublicKey<X25519> for X25519PublicKey {
-    type Error = Error;
     type EncodedPublicKey = [u8; 32];
+    type Error = Error;
 
     fn from_bytes(bytes: &[u8]) -> Result<Self, Self::Error> {
         let byte_arr: [u8; 32] = bytes.try_into().map_err(|_| Error::WrongSize)?;
-        Ok(Self(bssl_crypto::x25519::PublicKey::from(&byte_arr)))
+        Ok(Self(bssl_crypto::x25519::PublicKey::from(byte_arr)))
     }
 
     fn to_bytes(&self) -> Self::EncodedPublicKey {
-        self.0.to_bytes()
+        self.0
     }
 }
 

diff --git a/nearby/crypto/crypto_provider_default/Cargo.toml b/nearby/crypto/crypto_provider_default/Cargo.toml
index 4c906e4..d79739b 100644
--- a/nearby/crypto/crypto_provider_default/Cargo.toml
+++ b/nearby/crypto/crypto_provider_default/Cargo.toml

@@ -10,8 +10,7 @@
 [dependencies]
 crypto_provider.workspace = true
 crypto_provider_rustcrypto = {workspace = true, optional = true}
-crypto_provider_boringssl = {path = "../crypto_provider_boringssl", optional = true}
-crypto_provider_openssl = {workspace = true, optional = true}
+crypto_provider_boringssl = {workspace = true, optional = true}
 cfg-if.workspace = true
 
 [features]
@@ -19,5 +18,3 @@
 std = ["crypto_provider_rustcrypto/std"]
 rustcrypto = ["crypto_provider_rustcrypto"]
 boringssl = ["crypto_provider_boringssl"]
-opensslbssl = ["crypto_provider_openssl/boringssl"]
-openssl = ["crypto_provider_openssl"]

diff --git a/nearby/crypto/crypto_provider_default/src/lib.rs b/nearby/crypto/crypto_provider_default/src/lib.rs
index 52da9d4..dcde771 100644
--- a/nearby/crypto/crypto_provider_default/src/lib.rs
+++ b/nearby/crypto/crypto_provider_default/src/lib.rs

@@ -22,8 +22,6 @@
         pub use crypto_provider_rustcrypto::RustCrypto as CryptoProviderImpl;
     } else if #[cfg(feature = "boringssl")] {
         pub use crypto_provider_boringssl::Boringssl as CryptoProviderImpl;
-    } else if #[cfg(any(feature = "openssl", feature = "opensslbssl"))] {
-        pub use crypto_provider_openssl::Openssl as CryptoProviderImpl;
     } else {
         compile_error!("No crypto_provider feature enabled!");
     }

diff --git a/nearby/crypto/crypto_provider_openssl/Cargo.toml b/nearby/crypto/crypto_provider_openssl/Cargo.toml
deleted file mode 100644
index 19ef3e4..0000000
--- a/nearby/crypto/crypto_provider_openssl/Cargo.toml
+++ /dev/null

@@ -1,25 +0,0 @@
-[package]
-name = "crypto_provider_openssl"
-version.workspace = true
-edition.workspace = true
-publish.workspace = true
-
-[lints]
-workspace = true
-
-[dependencies]
-crypto_provider = { workspace = true, features = ["alloc", "std"] }
-crypto_provider_stubs.workspace = true
-openssl.workspace = true
-cfg-if.workspace = true
-
-ouroboros = "0.17.0"
-
-[features]
-default = []
-boringssl = ["openssl/unstable_boringssl"]
-
-[dev-dependencies]
-crypto_provider_test.workspace = true
-rstest.workspace = true
-hex-literal.workspace = true

diff --git a/nearby/crypto/crypto_provider_openssl/src/aes.rs b/nearby/crypto/crypto_provider_openssl/src/aes.rs
deleted file mode 100644
index 857be74..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/aes.rs
+++ /dev/null

@@ -1,273 +0,0 @@
-// 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.
-
-// 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.
-
-//! Implementation of `crypto_provider::aes` types using openssl's `symm` module.
-
-use openssl::symm::{Cipher, Crypter, Mode};
-
-use crypto_provider::{
-    aes::{
-        cbc::{AesCbcIv, DecryptionError, EncryptionError},
-        ctr::NonceAndCounter,
-        Aes, Aes128Key, Aes256Key, AesBlock, AesCipher, AesDecryptCipher, AesEncryptCipher, AesKey,
-    },
-    tinyvec::SliceVec,
-};
-
-/// Uber struct which contains impls for AES-128 fns
-pub struct Aes128;
-
-impl Aes for Aes128 {
-    type Key = Aes128Key;
-    type EncryptCipher = Aes128Cipher;
-    type DecryptCipher = Aes128Cipher;
-}
-
-/// Uber struct which contains impls for AES-256 fns
-pub struct Aes256;
-
-impl Aes for Aes256 {
-    type Key = Aes256Key;
-    type EncryptCipher = Aes256Cipher;
-    type DecryptCipher = Aes256Cipher;
-}
-
-/// Wrapper around openssl's AES-128 impl
-pub struct Aes128Cipher(Aes128Key);
-
-impl AesCipher for Aes128Cipher {
-    type Key = Aes128Key;
-
-    fn new(key: &Self::Key) -> Self {
-        Self(key.clone())
-    }
-}
-
-impl AesEncryptCipher for Aes128Cipher {
-    fn encrypt(&self, block: &mut AesBlock) {
-        // openssl requires the output to be at least 32 bytes long
-        let mut output = [0_u8; 32];
-        let mut crypter =
-            Crypter::new(Cipher::aes_128_ecb(), Mode::Encrypt, self.0.as_slice(), None).unwrap();
-        crypter.pad(false);
-        let _ = crypter.update(block, &mut output).unwrap();
-        block.copy_from_slice(&output[..crypto_provider::aes::BLOCK_SIZE]);
-    }
-}
-
-impl AesDecryptCipher for Aes128Cipher {
-    fn decrypt(&self, block: &mut AesBlock) {
-        // openssl requires the output to be at least 32 bytes long
-        let mut output = [0_u8; 32];
-        let mut crypter =
-            Crypter::new(Cipher::aes_128_ecb(), Mode::Decrypt, self.0.as_slice(), None).unwrap();
-        crypter.pad(false);
-        let _ = crypter.update(block, &mut output).unwrap();
-        block.copy_from_slice(&output[..crypto_provider::aes::BLOCK_SIZE]);
-    }
-}
-
-/// Wrapper around openssl's AES-128 impl
-pub struct Aes256Cipher(Aes256Key);
-
-impl AesCipher for Aes256Cipher {
-    type Key = Aes256Key;
-
-    fn new(key: &Self::Key) -> Self {
-        Self(key.clone())
-    }
-}
-
-impl AesEncryptCipher for Aes256Cipher {
-    fn encrypt(&self, block: &mut AesBlock) {
-        // openssl requires the output to be at least 32 bytes long
-        let mut output = [0_u8; 32];
-        let mut crypter =
-            Crypter::new(Cipher::aes_256_ecb(), Mode::Encrypt, self.0.as_slice(), None).unwrap();
-        crypter.pad(false);
-        let _ = crypter.update(block, &mut output).unwrap();
-        block.copy_from_slice(&output[..crypto_provider::aes::BLOCK_SIZE]);
-    }
-}
-
-impl AesDecryptCipher for Aes256Cipher {
-    fn decrypt(&self, block: &mut AesBlock) {
-        // openssl requires the output to be at least 32 bytes long
-        let mut output = [0_u8; 32];
-        let mut crypter =
-            Crypter::new(Cipher::aes_256_ecb(), Mode::Decrypt, self.0.as_slice(), None).unwrap();
-        crypter.pad(false);
-        let _ = crypter.update(block, &mut output).unwrap();
-        block.copy_from_slice(&output[..crypto_provider::aes::BLOCK_SIZE]);
-    }
-}
-
-/// OpenSSL implementation of AES-CBC-PKCS7.
-pub struct OpenSslAesCbcPkcs7;
-
-impl crypto_provider::aes::cbc::AesCbcPkcs7Padded for OpenSslAesCbcPkcs7 {
-    fn encrypt(key: &crypto_provider::aes::Aes256Key, iv: &AesCbcIv, message: &[u8]) -> Vec<u8> {
-        openssl::symm::encrypt(Cipher::aes_256_cbc(), key.as_slice(), Some(iv.as_slice()), message)
-            // The output buffer is allocated by the openssl crate and guarantees to have enough
-            // space to hold the output value and does not overlap with the input slice.
-            .expect("encrypt should always succeed")
-    }
-
-    fn encrypt_in_place(
-        key: &Aes256Key,
-        iv: &AesCbcIv,
-        message: &mut SliceVec<u8>,
-    ) -> Result<(), EncryptionError> {
-        let encrypted = Self::encrypt(key, iv, message);
-        if encrypted.len() > message.capacity() {
-            return Err(EncryptionError::PaddingFailed);
-        }
-        message.clear();
-        message.extend_from_slice(&encrypted);
-        Ok(())
-    }
-
-    fn decrypt(
-        key: &crypto_provider::aes::Aes256Key,
-        iv: &AesCbcIv,
-        ciphertext: &[u8],
-    ) -> Result<Vec<u8>, DecryptionError> {
-        openssl::symm::decrypt(
-            Cipher::aes_256_cbc(),
-            key.as_slice(),
-            Some(iv.as_slice()),
-            ciphertext,
-        )
-        .map_err(|_| DecryptionError::BadPadding)
-    }
-
-    fn decrypt_in_place(
-        key: &Aes256Key,
-        iv: &AesCbcIv,
-        ciphertext: &mut SliceVec<u8>,
-    ) -> Result<(), DecryptionError> {
-        Self::decrypt(key, iv, ciphertext).map(|result| {
-            ciphertext.clear();
-            ciphertext.extend_from_slice(&result);
-        })
-    }
-}
-
-/// OpenSSL implementation of AES-CTR-128
-pub struct OpenSslAesCtr128 {
-    enc_cipher: Crypter,
-}
-
-impl crypto_provider::aes::ctr::AesCtr for OpenSslAesCtr128 {
-    type Key = crypto_provider::aes::Aes128Key;
-    fn new(key: &Self::Key, nonce_and_counter: NonceAndCounter) -> Self {
-        Self {
-            enc_cipher: Crypter::new(
-                Cipher::aes_128_ctr(),
-                Mode::Encrypt,
-                key.as_slice(),
-                Some(&nonce_and_counter.as_block_array()),
-            )
-            .unwrap(),
-        }
-    }
-
-    fn apply_keystream(&mut self, data: &mut [u8]) {
-        let mut in_slice = vec![0u8; data.len()];
-        in_slice.copy_from_slice(data);
-        let _ = self.enc_cipher.update(&in_slice, data);
-    }
-}
-
-/// OpenSSL implementation of AES-CTR-256
-pub struct OpenSslAesCtr256 {
-    enc_cipher: Crypter,
-}
-
-impl crypto_provider::aes::ctr::AesCtr for OpenSslAesCtr256 {
-    type Key = crypto_provider::aes::Aes256Key;
-    fn new(key: &Self::Key, nonce_and_counter: NonceAndCounter) -> Self {
-        Self {
-            enc_cipher: Crypter::new(
-                Cipher::aes_256_ctr(),
-                Mode::Encrypt,
-                key.as_slice(),
-                Some(&nonce_and_counter.as_block_array()),
-            )
-            .unwrap(),
-        }
-    }
-
-    fn apply_keystream(&mut self, data: &mut [u8]) {
-        let mut in_slice = vec![0u8; data.len()];
-        in_slice.copy_from_slice(data);
-        let _ = self.enc_cipher.update(&in_slice, data);
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use core::marker::PhantomData;
-
-    use crypto_provider_test::aes::cbc::*;
-    use crypto_provider_test::aes::ctr::*;
-    use crypto_provider_test::aes::*;
-
-    use super::*;
-
-    #[apply(aes_128_ctr_test_cases)]
-    fn aes_128_ctr_test(testcase: CryptoProviderTestCase<OpenSslAesCtr128>) {
-        testcase(PhantomData);
-    }
-
-    #[apply(aes_256_ctr_test_cases)]
-    fn aes_256_ctr_test(testcase: CryptoProviderTestCase<OpenSslAesCtr256>) {
-        testcase(PhantomData);
-    }
-
-    #[apply(aes_128_encrypt_test_cases)]
-    fn aes_128_enc_test(testcase: CryptoProviderTestCase<Aes128Cipher>) {
-        testcase(PhantomData);
-    }
-
-    #[apply(aes_128_decrypt_test_cases)]
-    fn aes_128_dec_test(testcase: CryptoProviderTestCase<Aes128Cipher>) {
-        testcase(PhantomData);
-    }
-
-    #[apply(aes_256_encrypt_test_cases)]
-    fn aes_256_enc_test(testcase: CryptoProviderTestCase<Aes256Cipher>) {
-        testcase(PhantomData);
-    }
-
-    #[apply(aes_256_decrypt_test_cases)]
-    fn aes_256_dec_test(testcase: CryptoProviderTestCase<Aes256Cipher>) {
-        testcase(PhantomData);
-    }
-
-    #[apply(aes_256_cbc_test_cases)]
-    fn aes_256_cbc_test(testcase: CryptoProviderTestCase<OpenSslAesCbcPkcs7>) {
-        testcase(PhantomData);
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/ed25519.rs b/nearby/crypto/crypto_provider_openssl/src/ed25519.rs
deleted file mode 100644
index 111348a..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/ed25519.rs
+++ /dev/null

@@ -1,136 +0,0 @@
-// 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::ed25519::{
-    InvalidBytes, RawPrivateKey, RawPrivateKeyPermit, RawPublicKey, RawSignature, Signature as _,
-    SignatureError,
-};
-use openssl::pkey::{Id, PKey, Private};
-use openssl::sign::{Signer, Verifier};
-
-pub struct Ed25519;
-
-impl crypto_provider::ed25519::Ed25519Provider for Ed25519 {
-    type KeyPair = KeyPair;
-    type PublicKey = PublicKey;
-    type Signature = Signature;
-}
-
-pub struct KeyPair(PKey<Private>);
-
-impl crypto_provider::ed25519::KeyPair for KeyPair {
-    type PublicKey = PublicKey;
-    type Signature = Signature;
-
-    fn raw_private_key(&self, _permit: &RawPrivateKeyPermit) -> RawPrivateKey {
-        let private_key = self.0.raw_private_key().unwrap();
-        let mut public_key = self.0.raw_public_key().unwrap();
-        let mut result = private_key;
-        result.append(&mut public_key);
-        result.try_into().unwrap()
-    }
-
-    fn from_raw_private_key(bytes: &RawPrivateKey, _permit: &RawPrivateKeyPermit) -> Self {
-        Self(PKey::private_key_from_raw_bytes(bytes, Id::ED25519).unwrap())
-    }
-
-    fn sign(&self, msg: &[u8]) -> Self::Signature {
-        let mut signer =
-            Signer::new_without_digest(&self.0).expect("should be able to create a signer");
-        let sig_bytes: RawSignature = signer
-            .sign_oneshot_to_vec(msg)
-            .expect("singing should succeed")
-            .try_into()
-            .expect("signature should be a valid size");
-
-        Self::Signature::from_bytes(&sig_bytes)
-    }
-
-    fn generate() -> Self {
-        let key = PKey::generate_ed25519().expect("key generation should not fail");
-        Self(key)
-    }
-
-    fn public(&self) -> Self::PublicKey {
-        PublicKey(
-            self.0.raw_public_key().expect("should be able to get a pubic key from a keypair"),
-        )
-    }
-}
-
-pub struct Signature(RawSignature);
-
-impl crypto_provider::ed25519::Signature for Signature {
-    fn from_bytes(bytes: &RawSignature) -> Self {
-        Self(*bytes)
-    }
-
-    fn to_bytes(&self) -> RawSignature {
-        self.0
-    }
-}
-
-pub struct PublicKey(Vec<u8>);
-
-impl crypto_provider::ed25519::PublicKey for PublicKey {
-    type Signature = Signature;
-
-    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidBytes>
-    where
-        Self: Sized,
-    {
-        Ok(PublicKey(bytes.to_vec()))
-    }
-
-    fn to_bytes(&self) -> RawPublicKey {
-        //Should be length 32
-        self.0.as_slice().try_into().unwrap()
-    }
-
-    fn verify_strict(
-        &self,
-        message: &[u8],
-        signature: &Self::Signature,
-    ) -> Result<(), SignatureError> {
-        let public_key = PKey::public_key_from_raw_bytes(self.0.as_slice(), Id::ED25519)
-            .expect("should be a valid public key");
-
-        let mut verifier = Verifier::new_without_digest(public_key.as_ref())
-            .expect("should be able to init verifier");
-        let result = verifier
-            .verify_oneshot(signature.0.as_slice(), message)
-            .expect("should be able to call verify");
-        if result {
-            Ok(())
-        } else {
-            Err(SignatureError)
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::ed25519::Ed25519;
-    use crypto_provider_test::ed25519::{run_rfc_test_vectors, run_wycheproof_test_vectors};
-
-    #[test]
-    fn wycheproof_test_ed25519_openssl() {
-        run_wycheproof_test_vectors::<Ed25519>()
-    }
-
-    #[test]
-    fn rfc_test_ed25519_openssl() {
-        run_rfc_test_vectors::<Ed25519>()
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/hkdf_boringssl.rs b/nearby/crypto/crypto_provider_openssl/src/hkdf_boringssl.rs
deleted file mode 100644
index 152cdfc..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/hkdf_boringssl.rs
+++ /dev/null

@@ -1,72 +0,0 @@
-// 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.
-
-//! BoringSSL based HKDF implementation. Unfortunately, because the OpenSSL and BoringSSL APIs
-//! diverged for HKDF, we have to have separate implementations.
-//!
-//! See the _Using BoringSSL_ section in `crypto/README.md` for instructions on
-//! how to test against BoringSSL, or see the subcommands in the top level crate.
-
-use crate::OpenSslHash;
-use crypto_provider::hkdf::InvalidLength;
-use std::marker::PhantomData;
-
-/// openssl based hkdf implementation
-pub struct Hkdf<H: OpenSslHash> {
-    _marker: PhantomData<H>,
-    salt: Option<Vec<u8>>,
-    ikm: Vec<u8>,
-}
-
-impl<H: OpenSslHash> crypto_provider::hkdf::Hkdf for Hkdf<H> {
-    fn new(salt: Option<&[u8]>, ikm: &[u8]) -> Self {
-        Self { _marker: Default::default(), salt: salt.map(Vec::from), ikm: Vec::from(ikm) }
-    }
-
-    fn expand_multi_info(
-        &self,
-        info_components: &[&[u8]],
-        okm: &mut [u8],
-    ) -> Result<(), InvalidLength> {
-        // open ssl will panic in the case of a 0 length okm, but expected behavior is no-op
-        if okm.is_empty() {
-            return Ok(());
-        }
-        openssl::hkdf::hkdf(
-            okm,
-            H::get_md(),
-            self.ikm.as_slice(),
-            self.salt.as_deref().unwrap_or_default(),
-            &info_components.concat(),
-        )
-        .map_err(|_| InvalidLength)
-        .map(|_| ())
-    }
-
-    fn expand(&self, info: &[u8], okm: &mut [u8]) -> Result<(), InvalidLength> {
-        self.expand_multi_info(&[info], okm)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::Openssl;
-    use core::marker::PhantomData;
-    use crypto_provider_test::hkdf::*;
-
-    #[apply(hkdf_test_cases)]
-    fn hkdf_tests(testcase: CryptoProviderTestCase<Openssl>) {
-        testcase(PhantomData);
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/hkdf_openssl.rs b/nearby/crypto/crypto_provider_openssl/src/hkdf_openssl.rs
deleted file mode 100644
index b726f5f..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/hkdf_openssl.rs
+++ /dev/null

@@ -1,68 +0,0 @@
-// 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::OpenSslHash;
-use crypto_provider::hkdf::InvalidLength;
-use std::marker::PhantomData;
-
-/// openssl based hkdf implementation
-pub struct Hkdf<H: OpenSslHash> {
-    _marker: PhantomData<H>,
-    salt: Option<Vec<u8>>,
-    ikm: Vec<u8>,
-}
-
-impl<H: OpenSslHash> crypto_provider::hkdf::Hkdf for Hkdf<H> {
-    fn new(salt: Option<&[u8]>, ikm: &[u8]) -> Self {
-        Self { _marker: Default::default(), salt: salt.map(Vec::from), ikm: Vec::from(ikm) }
-    }
-
-    fn expand_multi_info(
-        &self,
-        info_components: &[&[u8]],
-        okm: &mut [u8],
-    ) -> Result<(), InvalidLength> {
-        // open ssl will panic in the case of a 0 length okm, but expected behavior is no-op
-        if okm.is_empty() {
-            return Ok(());
-        }
-        let mut ctx = openssl::pkey_ctx::PkeyCtx::new_id(openssl::pkey::Id::HKDF)
-            .expect("hkdf context should not fail");
-        let md = H::get_md();
-        ctx.derive_init().expect("hkdf derive init should not fail");
-        ctx.set_hkdf_md(md).expect("hkdf set md should not fail");
-        let _ = self.salt.as_ref().map(|salt| {
-            ctx.set_hkdf_salt(salt.as_slice()).expect("setting the salt is infallible")
-        });
-        ctx.set_hkdf_key(self.ikm.as_slice()).expect("should be able to set key");
-        ctx.add_hkdf_info(&info_components.concat()).expect("should be able to add info");
-        ctx.derive(Some(okm)).map_err(|_| InvalidLength).map(|_| ())
-    }
-
-    fn expand(&self, info: &[u8], okm: &mut [u8]) -> Result<(), InvalidLength> {
-        self.expand_multi_info(&[info], okm)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::Openssl;
-    use core::marker::PhantomData;
-    use crypto_provider_test::hkdf::*;
-
-    #[apply(hkdf_test_cases)]
-    fn hkdf_tests(testcase: CryptoProviderTestCase<Openssl>) {
-        testcase(PhantomData);
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/hmac_boringssl.rs b/nearby/crypto/crypto_provider_openssl/src/hmac_boringssl.rs
deleted file mode 100644
index 5272995..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/hmac_boringssl.rs
+++ /dev/null

@@ -1,103 +0,0 @@
-// 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.
-
-//! BoringSSL based HMAC implementation. Unfortunately, because the OpenSSL and BoringSSL APIs
-//! diverged (https://boringssl.googlesource.com/boringssl/+/HEAD/PORTING.md#hmac-s), we have to
-//! have separate implementations.
-//!
-//! See the _Using BoringSSL_ section in `crypto/README.md` for instructions on
-//! how to test against BoringSSL, or see the subcommands in the top level crate.
-
-use crate::{sha2::OpenSslSha256, sha2::OpenSslSha512, OpenSslHash};
-use crypto_provider::hmac::{InvalidLength, MacError};
-use openssl::hmac::HmacCtx;
-use openssl::memcmp;
-use std::marker::PhantomData;
-
-/// BoringSSL based HMAC implementation
-pub struct Hmac<H: OpenSslHash> {
-    marker: PhantomData<H>,
-    ctx: HmacCtx,
-}
-
-trait Hash<const N: usize>: OpenSslHash {}
-impl Hash<32> for OpenSslSha256 {}
-impl Hash<64> for OpenSslSha512 {}
-
-impl<const N: usize, H: Hash<N>> crypto_provider::hmac::Hmac<N> for Hmac<H> {
-    fn new_from_key(key: [u8; N]) -> Self {
-        Self { marker: PhantomData, ctx: HmacCtx::new(&key, H::get_md()).unwrap() }
-    }
-
-    fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength> {
-        Ok(Self { marker: PhantomData, ctx: HmacCtx::new(key, H::get_md()).unwrap() })
-    }
-
-    fn update(&mut self, data: &[u8]) {
-        self.ctx.update(data).expect("should be able to update signer");
-    }
-
-    fn finalize(mut self) -> [u8; N] {
-        let mut buf = [0_u8; N];
-        let _ = self.ctx.finalize(&mut buf).expect("wrong length");
-        buf
-    }
-
-    fn verify_slice(self, tag: &[u8]) -> Result<(), MacError> {
-        let binding: [u8; N] = self.finalize();
-        let slice = binding.as_slice();
-        if memcmp::eq(slice, tag) {
-            Ok(())
-        } else {
-            Err(MacError)
-        }
-    }
-
-    fn verify(self, tag: [u8; N]) -> Result<(), MacError> {
-        let binding: [u8; N] = self.finalize();
-        let slice = binding.as_slice();
-        if memcmp::eq(slice, &tag) {
-            Ok(())
-        } else {
-            Err(MacError)
-        }
-    }
-
-    fn verify_truncated_left(self, tag: &[u8]) -> Result<(), MacError> {
-        let binding: [u8; N] = self.finalize();
-        let slice = binding.as_slice();
-        let len = tag.len();
-        if len == 0 || len > H::get_digest().block_size() {
-            return Err(MacError);
-        }
-        let left = slice.get(..len).ok_or(MacError)?;
-        if memcmp::eq(left, tag) {
-            Ok(())
-        } else {
-            Err(MacError)
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::Openssl;
-    use core::marker::PhantomData;
-    use crypto_provider_test::hmac::*;
-
-    #[apply(hmac_test_cases)]
-    fn hmac_tests(testcase: CryptoProviderTestCase<Openssl>) {
-        testcase(PhantomData);
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/hmac_openssl.rs b/nearby/crypto/crypto_provider_openssl/src/hmac_openssl.rs
deleted file mode 100644
index 42f857e..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/hmac_openssl.rs
+++ /dev/null

@@ -1,176 +0,0 @@
-// 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::{sha2::OpenSslSha256, sha2::OpenSslSha512, OpenSslHash};
-use core::convert::TryInto;
-use crypto_provider::hmac::{InvalidLength, MacError};
-use openssl::memcmp;
-use openssl::pkey::{PKey, Private};
-use openssl::sign::Signer;
-use ouroboros::self_referencing;
-use std::marker::PhantomData;
-
-/// openssl based hmac implementation
-#[self_referencing]
-pub struct Hmac<H: OpenSslHash> {
-    ctx: PKey<Private>,
-    #[borrows(ctx)]
-    #[covariant]
-    signer: Signer<'this>,
-    marker: PhantomData<H>,
-}
-
-impl crypto_provider::hmac::Hmac<32> for Hmac<OpenSslSha256> {
-    fn new_from_key(key: [u8; 32]) -> Self {
-        new_from_key(key)
-    }
-
-    fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength> {
-        new_from_slice(key)
-    }
-
-    fn update(&mut self, data: &[u8]) {
-        update(self, data)
-    }
-
-    fn finalize(self) -> [u8; 32] {
-        finalize(self)
-    }
-
-    fn verify_slice(self, tag: &[u8]) -> Result<(), MacError> {
-        verify_slice(self, tag)
-    }
-
-    fn verify(self, tag: [u8; 32]) -> Result<(), MacError> {
-        verify(self, tag)
-    }
-
-    fn verify_truncated_left(self, tag: &[u8]) -> Result<(), MacError> {
-        verify_truncated_left(self, tag)
-    }
-}
-
-impl crypto_provider::hmac::Hmac<64> for Hmac<OpenSslSha512> {
-    fn new_from_key(key: [u8; 64]) -> Self {
-        new_from_key(key)
-    }
-
-    fn new_from_slice(key: &[u8]) -> Result<Self, InvalidLength> {
-        new_from_slice(key)
-    }
-
-    fn update(&mut self, data: &[u8]) {
-        update(self, data)
-    }
-
-    fn finalize(self) -> [u8; 64] {
-        finalize(self)
-    }
-
-    fn verify_slice(self, tag: &[u8]) -> Result<(), MacError> {
-        verify_slice(self, tag)
-    }
-
-    fn verify(self, tag: [u8; 64]) -> Result<(), MacError> {
-        verify(self, tag)
-    }
-
-    fn verify_truncated_left(self, tag: &[u8]) -> Result<(), MacError> {
-        verify_truncated_left(self, tag)
-    }
-}
-
-fn hmac_from_builder<H: OpenSslHash>(ctx: PKey<Private>) -> Hmac<H> {
-    let digest = H::get_digest();
-    HmacBuilder {
-        ctx,
-        marker: PhantomData,
-        signer_builder: |ctx: &openssl::pkey::PKey<openssl::pkey::Private>| {
-            Signer::new(digest, ctx).expect("should be able to create signer")
-        },
-    }
-    .build()
-}
-
-fn new_from_key<const N: usize, H: OpenSslHash>(key: [u8; N]) -> Hmac<H> {
-    let ctx = openssl::pkey::PKey::hmac(&key)
-        .expect("hmac creation shouldn't fail since key is of valid size");
-    hmac_from_builder(ctx)
-}
-
-fn new_from_slice<H: OpenSslHash>(key: &[u8]) -> Result<Hmac<H>, InvalidLength> {
-    openssl::pkey::PKey::hmac(key).map(hmac_from_builder).map_err(|_| InvalidLength)
-}
-
-fn update<H: OpenSslHash>(hmac: &mut Hmac<H>, data: &[u8]) {
-    hmac.with_signer_mut(|signer| {
-        signer.update(data).expect("should be able to update signer");
-    })
-}
-
-fn finalize<const N: usize, H: OpenSslHash>(hmac: Hmac<H>) -> [u8; N] {
-    hmac.borrow_signer()
-        .sign_to_vec()
-        .expect("sign to vec should succeed")
-        .as_slice()
-        .try_into()
-        .expect("wrong length")
-}
-
-fn verify_slice<H: OpenSslHash>(hmac: Hmac<H>, tag: &[u8]) -> Result<(), MacError> {
-    let binding = hmac.borrow_signer().sign_to_vec().expect("sign to vec should succeed");
-    let slice = binding.as_slice();
-    if memcmp::eq(slice, tag) {
-        Ok(())
-    } else {
-        Err(MacError)
-    }
-}
-
-fn verify<const N: usize, H: OpenSslHash>(hmac: Hmac<H>, tag: [u8; N]) -> Result<(), MacError> {
-    let binding = hmac.borrow_signer().sign_to_vec().expect("sign to vec should succeed");
-    let slice = binding.as_slice();
-    if memcmp::eq(slice, &tag) {
-        Ok(())
-    } else {
-        Err(MacError)
-    }
-}
-
-fn verify_truncated_left<H: OpenSslHash>(hmac: Hmac<H>, tag: &[u8]) -> Result<(), MacError> {
-    let binding = hmac.borrow_signer().sign_to_vec().expect("sign to vec should succeed");
-    let slice = binding.as_slice();
-    let len = tag.len();
-    if len == 0 || len > H::get_digest().block_size() {
-        return Err(MacError);
-    }
-    let left = slice.get(..len).ok_or(MacError)?;
-    if memcmp::eq(left, tag) {
-        Ok(())
-    } else {
-        Err(MacError)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::Openssl;
-    use core::marker::PhantomData;
-    use crypto_provider_test::hmac::*;
-
-    #[apply(hmac_test_cases)]
-    fn hmac_tests(testcase: CryptoProviderTestCase<Openssl>) {
-        testcase(PhantomData);
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/lib.rs b/nearby/crypto/crypto_provider_openssl/src/lib.rs
deleted file mode 100644
index 04b4e4c..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/lib.rs
+++ /dev/null

@@ -1,134 +0,0 @@
-#![forbid(unsafe_code)]
-// 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.
-
-//! Crate which provides impls for CryptoProvider backed by openssl
-
-// This crate treats allocation errors as handleable, which leads to unwraps everywhere, so they
-// have to be allowed here. This will be fixed when we can migrate over to the new boringssl bindings
-#![allow(clippy::expect_used, clippy::unwrap_used)]
-
-use cfg_if::cfg_if;
-pub use openssl;
-use openssl::hash::MessageDigest;
-use openssl::md::MdRef;
-use openssl::rand::rand_bytes;
-
-use crypto_provider::CryptoRng;
-
-/// Contains the openssl backed AES implementations for CryptoProvider
-mod aes;
-/// Contains the openssl backed ed25519 impl for key generation, verification, and signing
-mod ed25519;
-
-cfg_if! {
-    if #[cfg(feature = "boringssl")] {
-        /// Contains the boringssl backed hkdf impl for CryptoProvider
-        mod hkdf_boringssl;
-        use hkdf_boringssl as hkdf;
-        /// Contains the boringssl backed hmac impl for CryptoProvider
-        mod hmac_boringssl;
-        use hmac_boringssl as hmac;
-    } else {
-        /// Contains the openssl backed hkdf impl for CryptoProvider
-        mod hkdf_openssl;
-        use hkdf_openssl as hkdf;
-        /// Contains the openssl backed hmac impl for CryptoProvider
-        mod hmac_openssl;
-        use hmac_openssl as hmac;
-    }
-}
-/// Contains the openssl backed NIST-P256 impl for CryptoProvider
-mod p256;
-/// Contains the openssl backed SHA2 impl for CryptoProvider
-mod sha2;
-/// Contains the openssl backed X25519 impl for CryptoProvider
-mod x25519;
-
-/// The the openssl backed struct which implements CryptoProvider
-#[derive(Default, Clone, Debug, PartialEq, Eq)]
-pub struct Openssl;
-
-/// The trait which defines a has used in openssl crypto operations
-pub trait OpenSslHash {
-    /// gets the message digest algorithm to be used by the hmac implementation
-    fn get_digest() -> MessageDigest;
-    /// gets a reference to a message digest algorithm to be used by the hkdf implementation
-    fn get_md() -> &'static MdRef;
-}
-
-impl crypto_provider::CryptoProvider for Openssl {
-    type HkdfSha256 = hkdf::Hkdf<sha2::OpenSslSha256>;
-    type HmacSha256 = hmac::Hmac<sha2::OpenSslSha256>;
-    type HkdfSha512 = hkdf::Hkdf<sha2::OpenSslSha512>;
-    type HmacSha512 = hmac::Hmac<sha2::OpenSslSha512>;
-    type AesCbcPkcs7Padded = aes::OpenSslAesCbcPkcs7;
-    type X25519 = x25519::X25519Ecdh;
-    type P256 = p256::P256Ecdh;
-    type Sha256 = sha2::OpenSslSha256;
-    type Sha512 = sha2::OpenSslSha512;
-    type Aes128 = aes::Aes128;
-    type Aes256 = aes::Aes256;
-    type AesCtr128 = aes::OpenSslAesCtr128;
-    type AesCtr256 = aes::OpenSslAesCtr256;
-    type Ed25519 = ed25519::Ed25519;
-    type Aes128GcmSiv = crypto_provider_stubs::Aes128Stubs;
-    type Aes256GcmSiv = crypto_provider_stubs::Aes256Stubs;
-    type Aes128Gcm = crypto_provider_stubs::Aes128Stubs;
-    type Aes256Gcm = crypto_provider_stubs::Aes256Stubs;
-    type CryptoRng = OpenSslRng;
-
-    fn constant_time_eq(a: &[u8], b: &[u8]) -> bool {
-        a.len() == b.len() && openssl::memcmp::eq(a, b)
-    }
-}
-
-/// OpenSSL implemented random number generator
-pub struct OpenSslRng;
-
-impl CryptoRng for OpenSslRng {
-    fn new() -> Self {
-        OpenSslRng {}
-    }
-
-    fn next_u64(&mut self) -> u64 {
-        let mut buf = [0; 8];
-        rand_bytes(&mut buf).unwrap();
-        u64::from_be_bytes(buf)
-    }
-
-    fn fill(&mut self, dest: &mut [u8]) {
-        rand_bytes(dest).expect("Error in generating random bytes")
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use core::marker::PhantomData;
-
-    use crypto_provider_test::sha2::*;
-    use crypto_provider_test::{prelude::*, *};
-
-    use crate::Openssl;
-
-    #[apply(sha2_test_cases)]
-    fn sha2_tests(testcase: CryptoProviderTestCase<Openssl>) {
-        testcase(PhantomData);
-    }
-
-    #[apply(constant_time_eq_test_cases)]
-    fn constant_time_eq_tests(testcase: CryptoProviderTestCase<Openssl>) {
-        testcase(PhantomData);
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/p256.rs b/nearby/crypto/crypto_provider_openssl/src/p256.rs
deleted file mode 100644
index 17dd6ce..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/p256.rs
+++ /dev/null

@@ -1,202 +0,0 @@
-// 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::{
-    elliptic_curve::{EcdhProvider, EphemeralSecret},
-    p256::{PointCompression, P256},
-    tinyvec::ArrayVec,
-};
-use openssl::bn::{BigNum, BigNumContext};
-use openssl::derive::Deriver;
-use openssl::ec::{EcGroup, EcKey, EcPoint, PointConversionForm};
-use openssl::error::ErrorStack;
-use openssl::nid::Nid;
-use openssl::pkey::{PKey, Private, Public};
-
-/// Public key type for P256 using OpenSSL's implementation.
-#[derive(Debug)]
-pub struct P256PublicKey(PKey<Public>);
-
-impl PartialEq for P256PublicKey {
-    fn eq(&self, other: &Self) -> bool {
-        self.0.public_eq(&other.0)
-    }
-}
-
-/// Custom error type for OpenSSL operations.
-#[derive(Debug)]
-#[allow(clippy::enum_variant_names)]
-pub enum Error {
-    /// Error from the openssl crate.
-    OpenSslError(ErrorStack),
-    /// Unexpected size for the given input.
-    WrongSize,
-    /// Invalid input given when creating keys from their byte representations.
-    InvalidInput,
-}
-
-impl From<ErrorStack> for Error {
-    fn from(value: ErrorStack) -> Self {
-        Self::OpenSslError(value)
-    }
-}
-
-/// The OpenSSL implementation of P256 public key.
-impl crypto_provider::p256::P256PublicKey for P256PublicKey {
-    type Error = Error;
-
-    fn from_sec1_bytes(bytes: &[u8]) -> Result<Self, Self::Error> {
-        if bytes == [0] {
-            // Single 0 byte means infinity point.
-            return Err(Error::InvalidInput);
-        }
-        let ecgroup = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1)?;
-        let mut bncontext = BigNumContext::new()?;
-        let ecpoint = EcPoint::from_bytes(&ecgroup, bytes, &mut bncontext)?;
-        let eckey = EcKey::from_public_key(&ecgroup, &ecpoint)?;
-        Ok(Self(eckey.try_into()?))
-    }
-
-    fn to_sec1_bytes(&self, point_compression: PointCompression) -> ArrayVec<[u8; 65]> {
-        let point_conversion_form = match point_compression {
-            PointCompression::Compressed => PointConversionForm::COMPRESSED,
-            PointCompression::Uncompressed => PointConversionForm::UNCOMPRESSED,
-        };
-        let ecgroup = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();
-        let mut bncontext = BigNumContext::new().unwrap();
-        let mut bytes = ArrayVec::<[u8; 65]>::new();
-        bytes.extend_from_slice(
-            &self
-                .0
-                .ec_key()
-                .unwrap()
-                .public_key()
-                .to_bytes(&ecgroup, point_conversion_form, &mut bncontext)
-                .unwrap(),
-        );
-        bytes
-    }
-
-    fn from_affine_coordinates(x: &[u8; 32], y: &[u8; 32]) -> Result<Self, Self::Error> {
-        let bn_x = BigNum::from_slice(x)?;
-        let bn_y = BigNum::from_slice(y)?;
-        let ecgroup = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1)?;
-        let eckey = EcKey::from_public_key_affine_coordinates(&ecgroup, &bn_x, &bn_y)?;
-        Ok(Self(eckey.try_into()?))
-    }
-
-    fn to_affine_coordinates(&self) -> Result<([u8; 32], [u8; 32]), Self::Error> {
-        let mut bnctx = openssl::bn::BigNumContext::new()?;
-        let ecgroup = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1)?;
-        let p256_key = self.0.ec_key()?;
-        let mut p256x = BigNum::new()?;
-        let mut p256y = BigNum::new()?;
-        p256_key
-            .public_key()
-            .affine_coordinates_gfp(&ecgroup, &mut p256x, &mut p256y, &mut bnctx)?;
-        Ok((
-            p256x
-                .to_vec_padded(32)
-                .map_err(|_| Error::WrongSize)?
-                .try_into()
-                .expect("to_vec_padded(32) should always return vec of length 32"),
-            p256y
-                .to_vec_padded(32)
-                .map_err(|_| Error::WrongSize)?
-                .try_into()
-                .expect("to_vec_padded(32) should always return vec of length 32"),
-        ))
-    }
-}
-
-/// Private key type for P256 using OpenSSL's implementation.
-pub struct P256EphemeralSecret(PKey<Private>);
-
-impl EphemeralSecret<P256> for P256EphemeralSecret {
-    type Impl = P256Ecdh;
-    type Error = Error;
-    type Rng = ();
-    type EncodedPublicKey = ArrayVec<[u8; 65]>;
-
-    fn generate_random(_rng: &mut Self::Rng) -> Self {
-        let ecgroup = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();
-        let eckey = EcKey::generate(&ecgroup).unwrap();
-        Self(eckey.try_into().unwrap())
-    }
-
-    fn public_key_bytes(&self) -> Self::EncodedPublicKey {
-        let ecgroup = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();
-        let mut bncontext = BigNumContext::new().unwrap();
-        let mut bytes = Self::EncodedPublicKey::new();
-        bytes.extend_from_slice(
-            &self
-                .0
-                .ec_key()
-                .unwrap()
-                .public_key()
-                .to_bytes(&ecgroup, PointConversionForm::COMPRESSED, &mut bncontext)
-                .unwrap(),
-        );
-        bytes
-    }
-
-    fn diffie_hellman(
-        self,
-        other_pub: &<Self::Impl as EcdhProvider<P256>>::PublicKey,
-    ) -> Result<<Self::Impl as EcdhProvider<P256>>::SharedSecret, Self::Error> {
-        let mut deriver = Deriver::new(&self.0)?;
-        deriver.set_peer(&other_pub.0)?;
-        let mut buf = [0_u8; 32];
-        let bytes_written = deriver.derive(&mut buf)?;
-        debug_assert_eq!(bytes_written, 32);
-        Ok(buf)
-    }
-}
-
-#[cfg(test)]
-impl crypto_provider_test::elliptic_curve::EphemeralSecretForTesting<P256> for P256EphemeralSecret {
-    fn from_private_components(
-        private_bytes: &[u8; 32],
-        public_key: &P256PublicKey,
-    ) -> Result<Self, Self::Error> {
-        let ecgroup = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();
-        let private_key_bn = BigNum::from_slice(private_bytes)?;
-        let eckey = EcKey::from_private_components(
-            &ecgroup,
-            &private_key_bn,
-            public_key.0.ec_key()?.public_key(),
-        )?;
-        Ok(Self(eckey.try_into()?))
-    }
-}
-
-/// The OpenSSL implementation of P256 ECDH.
-pub enum P256Ecdh {}
-impl EcdhProvider<P256> for P256Ecdh {
-    type PublicKey = P256PublicKey;
-    type EphemeralSecret = P256EphemeralSecret;
-    type SharedSecret = [u8; 32];
-}
-
-#[cfg(test)]
-mod tests {
-    use super::P256Ecdh;
-    use core::marker::PhantomData;
-    use crypto_provider_test::p256::*;
-
-    #[apply(p256_test_cases)]
-    fn p256_tests(testcase: CryptoProviderTestCase<P256Ecdh>, _name: &str) {
-        testcase(PhantomData)
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/sha2.rs b/nearby/crypto/crypto_provider_openssl/src/sha2.rs
deleted file mode 100644
index 68fee79..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/sha2.rs
+++ /dev/null

@@ -1,71 +0,0 @@
-// 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 openssl::hash::MessageDigest;
-use openssl::md::{Md, MdRef};
-use openssl::md_ctx::MdCtx;
-
-use crate::OpenSslHash;
-
-/// openssl sha256 digest algorithm
-#[derive(Clone)]
-pub struct OpenSslSha256 {}
-
-impl OpenSslHash for OpenSslSha256 {
-    fn get_digest() -> MessageDigest {
-        MessageDigest::sha256()
-    }
-
-    fn get_md() -> &'static MdRef {
-        Md::sha256()
-    }
-}
-
-impl crypto_provider::sha2::Sha256 for OpenSslSha256 {
-    fn sha256(input: &[u8]) -> [u8; 32] {
-        let mut mdctx = MdCtx::new().unwrap();
-        mdctx.digest_init(Self::get_md()).unwrap();
-        mdctx.digest_update(input).unwrap();
-        let mut buf = [0_u8; 32];
-        let size = mdctx.digest_final(&mut buf).unwrap();
-        debug_assert_eq!(size, 32);
-        buf
-    }
-}
-
-/// openssl sha512 digest algorithm
-#[derive(Clone)]
-pub struct OpenSslSha512 {}
-
-impl OpenSslHash for OpenSslSha512 {
-    fn get_digest() -> MessageDigest {
-        MessageDigest::sha512()
-    }
-
-    fn get_md() -> &'static MdRef {
-        Md::sha512()
-    }
-}
-
-impl crypto_provider::sha2::Sha512 for OpenSslSha512 {
-    fn sha512(input: &[u8]) -> [u8; 64] {
-        let mut mdctx = MdCtx::new().unwrap();
-        mdctx.digest_init(Self::get_md()).unwrap();
-        mdctx.digest_update(input).unwrap();
-        let mut buf = [0_u8; 64];
-        let size = mdctx.digest_final(&mut buf).unwrap();
-        debug_assert_eq!(size, 64);
-        buf
-    }
-}

diff --git a/nearby/crypto/crypto_provider_openssl/src/x25519.rs b/nearby/crypto/crypto_provider_openssl/src/x25519.rs
deleted file mode 100644
index 2cb4cab..0000000
--- a/nearby/crypto/crypto_provider_openssl/src/x25519.rs
+++ /dev/null

@@ -1,106 +0,0 @@
-// 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::elliptic_curve::{EcdhProvider, EphemeralSecret, PublicKey};
-use crypto_provider::x25519::X25519;
-use openssl::derive::Deriver;
-use openssl::error::ErrorStack;
-use openssl::pkey::{Id, PKey, Private, Public};
-
-/// Public key type for X25519 using OpenSSL's implementation.
-#[derive(Debug)]
-pub struct X25519PublicKey(PKey<Public>);
-
-impl PartialEq for X25519PublicKey {
-    fn eq(&self, other: &Self) -> bool {
-        self.0.public_eq(&other.0)
-    }
-}
-
-impl PublicKey<X25519> for X25519PublicKey {
-    type Error = ErrorStack;
-    type EncodedPublicKey = [u8; 32];
-
-    fn from_bytes(bytes: &[u8]) -> Result<Self, Self::Error> {
-        let key = PKey::public_key_from_raw_bytes(bytes, Id::X25519)?;
-        Ok(X25519PublicKey(key))
-    }
-
-    fn to_bytes(&self) -> Self::EncodedPublicKey {
-        self.0.raw_public_key().unwrap().try_into().unwrap()
-    }
-}
-
-/// Private key type for X25519 using OpenSSL's implementation.
-pub struct X25519PrivateKey(PKey<Private>);
-
-impl EphemeralSecret<X25519> for X25519PrivateKey {
-    type Impl = X25519Ecdh;
-    type Error = ErrorStack;
-    type Rng = ();
-    type EncodedPublicKey = [u8; 32];
-
-    fn generate_random(_rng: &mut Self::Rng) -> Self {
-        let private_key = openssl::pkey::PKey::generate_x25519().unwrap();
-        Self(private_key)
-    }
-
-    fn public_key_bytes(&self) -> Self::EncodedPublicKey {
-        self.0.raw_public_key().unwrap().try_into().unwrap()
-    }
-
-    fn diffie_hellman(
-        self,
-        other_pub: &X25519PublicKey,
-    ) -> Result<<Self::Impl as EcdhProvider<X25519>>::SharedSecret, Self::Error> {
-        let mut deriver = Deriver::new(&self.0)?;
-        deriver.set_peer(&other_pub.0)?;
-        let mut buf = [0_u8; 32];
-        let num_bytes_written = deriver.derive(&mut buf)?;
-        debug_assert_eq!(num_bytes_written, 32);
-        Ok(buf)
-    }
-}
-
-#[cfg(test)]
-impl crypto_provider_test::elliptic_curve::EphemeralSecretForTesting<X25519> for X25519PrivateKey {
-    fn from_private_components(
-        private_bytes: &[u8; 32],
-        _public_key: &<Self::Impl as EcdhProvider<X25519>>::PublicKey,
-    ) -> Result<Self, Self::Error> {
-        let pkey = PKey::private_key_from_raw_bytes(private_bytes, Id::X25519)?;
-        Ok(Self(pkey))
-    }
-}
-
-/// The OpenSSL implementation of X25519 ECDH.
-pub enum X25519Ecdh {}
-impl EcdhProvider<X25519> for X25519Ecdh {
-    type PublicKey = X25519PublicKey;
-    type EphemeralSecret = X25519PrivateKey;
-    type SharedSecret = [u8; 32];
-}
-
-#[cfg(test)]
-mod tests {
-    use core::marker::PhantomData;
-    use crypto_provider_test::x25519::*;
-
-    use super::X25519Ecdh;
-
-    #[apply(x25519_test_cases)]
-    fn x25519_tests(testcase: CryptoProviderTestCase<X25519Ecdh>) {
-        testcase(PhantomData::<X25519Ecdh>)
-    }
-}

diff --git a/nearby/crypto/crypto_provider_rustcrypto/src/ed25519.rs b/nearby/crypto/crypto_provider_rustcrypto/src/ed25519.rs
index ce8089e..46abfc3 100644
--- a/nearby/crypto/crypto_provider_rustcrypto/src/ed25519.rs
+++ b/nearby/crypto/crypto_provider_rustcrypto/src/ed25519.rs

@@ -15,8 +15,8 @@
 use ed25519_dalek::Signer;
 
 use crypto_provider::ed25519::{
-    InvalidBytes, RawPrivateKey, RawPrivateKeyPermit, RawPublicKey, RawSignature, Signature as _,
-    SignatureError, PRIVATE_KEY_LENGTH, PUBLIC_KEY_LENGTH, SIGNATURE_LENGTH,
+    InvalidPublicKeyBytes, RawPrivateKey, RawPrivateKeyPermit, RawPublicKey, RawSignature,
+    Signature as _, SignatureError, PRIVATE_KEY_LENGTH, PUBLIC_KEY_LENGTH, SIGNATURE_LENGTH,
 };
 
 pub struct Ed25519;
@@ -76,11 +76,13 @@
 impl crypto_provider::ed25519::PublicKey for PublicKey {
     type Signature = Signature;
 
-    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidBytes>
+    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidPublicKeyBytes>
     where
         Self: Sized,
     {
-        ed25519_dalek::VerifyingKey::from_bytes(bytes).map(PublicKey).map_err(|_| InvalidBytes)
+        ed25519_dalek::VerifyingKey::from_bytes(bytes)
+            .map(PublicKey)
+            .map_err(|_| InvalidPublicKeyBytes)
     }
 
     fn to_bytes(&self) -> [u8; PUBLIC_KEY_LENGTH] {

diff --git a/nearby/crypto/crypto_provider_stubs/src/lib.rs b/nearby/crypto/crypto_provider_stubs/src/lib.rs
index 32c9381..83d54ff 100644
--- a/nearby/crypto/crypto_provider_stubs/src/lib.rs
+++ b/nearby/crypto/crypto_provider_stubs/src/lib.rs

@@ -29,7 +29,7 @@
         Aes, Aes128Key, Aes256Key, AesBlock, AesCipher, AesDecryptCipher, AesEncryptCipher,
     },
     ed25519::{
-        self, Ed25519Provider, InvalidBytes, KeyPair, RawPrivateKey, RawPrivateKeyPermit,
+        self, Ed25519Provider, InvalidPublicKeyBytes, KeyPair, RawPrivateKey, RawPrivateKeyPermit,
         RawPublicKey, RawSignature, Signature, SignatureError,
     },
     elliptic_curve::{EcdhProvider, EphemeralSecret, PublicKey},
@@ -480,7 +480,7 @@
 impl ed25519::PublicKey for PublicKeyStubs {
     type Signature = SignatureStubs;
 
-    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidBytes>
+    fn from_bytes(bytes: &RawPublicKey) -> Result<Self, InvalidPublicKeyBytes>
     where
         Self: Sized,
     {

diff --git a/nearby/crypto/crypto_provider_test/fuzz/Cargo.lock b/nearby/crypto/crypto_provider_test/fuzz/Cargo.lock
index bd8f6f9..72c827b 100644
--- a/nearby/crypto/crypto_provider_test/fuzz/Cargo.lock
+++ b/nearby/crypto/crypto_provider_test/fuzz/Cargo.lock

@@ -54,16 +54,10 @@
 ]
 
 [[package]]
-name = "aliasable"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "250f629c0161ad8107cf89319e990051fae62832fd343083bea452d93e2205fd"
-
-[[package]]
 name = "arbitrary"
-version = "1.3.0"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
+checksum = "7d5a26814d8dcb93b0e5a0ff3c6d80a8843bafb21b39e8e18a6f05471870e110"
 dependencies = [
  "derive_arbitrary",
 ]
@@ -75,12 +69,6 @@
 checksum = "4c7f02d4ea65f2c1853089ffd8d2787bdbc63de2f0d29dedbcf8ccdfa0ccd4cf"
 
 [[package]]
-name = "bitflags"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
-[[package]]
 name = "block-buffer"
 version = "0.10.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -99,10 +87,21 @@
 ]
 
 [[package]]
+name = "bssl-crypto"
+version = "0.2.0"
+dependencies = [
+ "bssl-sys",
+]
+
+[[package]]
+name = "bssl-sys"
+version = "0.1.0"
+
+[[package]]
 name = "bytes"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "cbc"
@@ -115,11 +114,12 @@
 
 [[package]]
 name = "cc"
-version = "1.0.79"
+version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
 dependencies = [
  "jobserver",
+ "libc",
 ]
 
 [[package]]
@@ -140,24 +140,24 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.4"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.9"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.2"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -184,27 +184,24 @@
 ]
 
 [[package]]
+name = "crypto_provider_boringssl"
+version = "0.1.0"
+dependencies = [
+ "bssl-crypto",
+ "crypto_provider",
+]
+
+[[package]]
 name = "crypto_provider_default"
 version = "0.1.0"
 dependencies = [
  "cfg-if",
  "crypto_provider",
- "crypto_provider_openssl",
+ "crypto_provider_boringssl",
  "crypto_provider_rustcrypto",
 ]
 
 [[package]]
-name = "crypto_provider_openssl"
-version = "0.1.0"
-dependencies = [
- "cfg-if",
- "crypto_provider",
- "crypto_provider_stubs",
- "openssl",
- "ouroboros",
-]
-
-[[package]]
 name = "crypto_provider_rustcrypto"
 version = "0.1.0"
 dependencies = [
@@ -230,13 +227,6 @@
 ]
 
 [[package]]
-name = "crypto_provider_stubs"
-version = "0.1.0"
-dependencies = [
- "crypto_provider",
-]
-
-[[package]]
 name = "crypto_provider_test-fuzz"
 version = "0.0.0"
 dependencies = [
@@ -257,9 +247,9 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0"
+version = "4.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
+checksum = "0a677b8922c94e01bdbb12126b0bc852f00447528dee1782229af9c720c3f348"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -273,20 +263,20 @@
 
 [[package]]
 name = "curve25519-dalek-derive"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn",
 ]
 
 [[package]]
 name = "der"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
+checksum = "fffa369a668c8af7dbf8b5e56c9f744fbd399949ed171606040001947de40b1c"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -294,13 +284,13 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.1"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
+checksum = "67e77553c4162a157adbf834ebae5b415acbecbeafc7a74b0e886657506a7611"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.26",
+ "syn",
 ]
 
 [[package]]
@@ -316,30 +306,31 @@
 
 [[package]]
 name = "ed25519"
-version = "2.2.1"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fb04eee5d9d907f29e80ee6b0e78f7e2c82342c63e3580d8c4f69d9d5aad963"
+checksum = "115531babc129696a58c64a4fef0a8bf9e9698629fb97e9e40767d235cfbcd53"
 dependencies = [
  "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+checksum = "4a3daa8e81a3963a60642bcc1f90a670680bd4a77535faa384e9d1c79d620871"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
  "rand_core",
  "sha2",
+ "subtle",
 ]
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.5"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -366,24 +357,9 @@
 
 [[package]]
 name = "fiat-crypto"
-version = "0.1.20"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
-
-[[package]]
-name = "foreign-types"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
-dependencies = [
- "foreign-types-shared",
-]
-
-[[package]]
-name = "foreign-types-shared"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
+checksum = "1676f435fc1dadde4d03e43f5d62b259e1ce5f40bd4ffb21db2b42ebe59c1382"
 
 [[package]]
 name = "generic-array"
@@ -398,9 +374,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.10"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
 dependencies = [
  "cfg-if",
  "libc",
@@ -429,16 +405,10 @@
 ]
 
 [[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"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791a029f6b9fc27657f6f188ec6e5e43f6911f6f878e0dc5501396e09809d437"
+checksum = "7b5f8eb2ad728638ea2c7d47a21db23b7b58a72ed6a38256b8a1849f15fbbdf7"
 dependencies = [
  "hmac",
 ]
@@ -464,24 +434,24 @@
 
 [[package]]
 name = "jobserver"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
+checksum = "8c37f63953c4c63420ed5fd3d6d398c719489b9f872b9fa683262f8edd363c7d"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "libfuzzer-sys"
-version = "0.4.6"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "beb09950ae85a0a94b27676cccf37da5ff13f27076aa1adbc6545dd0d0e1bd4e"
+checksum = "a96cfd5557eb82f2b83fed4955246c988d331975a002961b07c81584d107e7f7"
 dependencies = [
  "arbitrary",
  "cc",
@@ -490,9 +460,9 @@
 
 [[package]]
 name = "once_cell"
-version = "1.18.0"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "opaque-debug"
@@ -501,68 +471,6 @@
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
 [[package]]
-name = "openssl"
-version = "0.10.55"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "345df152bc43501c5eb9e4654ff05f794effb78d4efe3d53abc158baddc0703d"
-dependencies = [
- "bitflags",
- "cfg-if",
- "foreign-types",
- "libc",
- "once_cell",
- "openssl-macros",
- "openssl-sys",
-]
-
-[[package]]
-name = "openssl-macros"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.26",
-]
-
-[[package]]
-name = "openssl-sys"
-version = "0.9.90"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "374533b0e45f3a7ced10fcaeccca020e66656bc03dac384f852e4e5a7a8104a6"
-dependencies = [
- "cc",
- "libc",
- "pkg-config",
- "vcpkg",
-]
-
-[[package]]
-name = "ouroboros"
-version = "0.17.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4361ddfdd108bddc19367ba805a3a43773d8bc3e407ac30e6c364cd264dd52e"
-dependencies = [
- "aliasable",
- "ouroboros_macro",
- "static_assertions",
-]
-
-[[package]]
-name = "ouroboros_macro"
-version = "0.17.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b81e113ed913910f05ef45c9344f67588fe6395f92d906eedf9ee5d54279922"
-dependencies = [
- "heck",
- "proc-macro-error",
- "proc-macro2",
- "quote",
- "syn 2.0.26",
-]
-
-[[package]]
 name = "p256"
 version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -573,16 +481,10 @@
 ]
 
 [[package]]
-name = "pkg-config"
-version = "0.3.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
-
-[[package]]
 name = "platforms"
-version = "3.0.2"
+version = "3.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+checksum = "626dec3cac7cc0e1577a2ec3fc496277ec2baa084bebad95bb6fdbfae235f84c"
 
 [[package]]
 name = "polyval"
@@ -604,51 +506,27 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.2"
+version = "0.13.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
+checksum = "353e1ca18966c16d9deb1c69278edbc5f194139612772bd9537af60ac231e1e6"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
-name = "proc-macro-error"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
-dependencies = [
- "proc-macro-error-attr",
- "proc-macro2",
- "quote",
- "syn 1.0.109",
- "version_check",
-]
-
-[[package]]
-name = "proc-macro-error-attr"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
-dependencies = [
- "proc-macro2",
- "quote",
- "version_check",
-]
-
-[[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.31"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -705,15 +583,15 @@
 
 [[package]]
 name = "semver"
-version = "1.0.18"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+checksum = "b97ed7a9823b74f99c7742f5336af7be5ecd3eeafcb1507d1fa93347b1d589b0"
 
 [[package]]
 name = "sha2"
-version = "0.10.7"
+version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -722,15 +600,9 @@
 
 [[package]]
 name = "signature"
-version = "2.1.0"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
-
-[[package]]
-name = "static_assertions"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
 
 [[package]]
 name = "subtle"
@@ -740,19 +612,9 @@
 
 [[package]]
 name = "syn"
-version = "1.0.109"
+version = "2.0.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "unicode-ident",
-]
-
-[[package]]
-name = "syn"
-version = "2.0.26"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
+checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -767,15 +629,15 @@
 
 [[package]]
 name = "typenum"
-version = "1.16.0"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.11"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "universal-hash"
@@ -788,12 +650,6 @@
 ]
 
 [[package]]
-name = "vcpkg"
-version = "0.2.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
-
-[[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -807,9 +663,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb66477291e7e8d2b0ff1bcb900bf29489a9692816d79874bea351e7a8b6de96"
+checksum = "c7e468321c81fb07fa7f4c636c3972b9100f0346e5b6a9f2bd0603a52f7ed277"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
@@ -817,6 +673,6 @@
 
 [[package]]
 name = "zeroize"
-version = "1.6.0"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
+checksum = "525b4ec142c6b68a2d10f01f7bbf6755599ca3f81ea53b8431b7dd348f5fdb2d"

diff --git a/nearby/crypto/crypto_provider_test/fuzz/Cargo.toml b/nearby/crypto/crypto_provider_test/fuzz/Cargo.toml
index 68fad3e..5bfc9ab 100644
--- a/nearby/crypto/crypto_provider_test/fuzz/Cargo.toml
+++ b/nearby/crypto/crypto_provider_test/fuzz/Cargo.toml

@@ -15,7 +15,7 @@
 
 [features]
 default = ["crypto_provider_default/default"]
-openssl = ["crypto_provider_default/openssl"]
+boringssl = ["crypto_provider_default/boringssl"]
 
 # Prevent this from interfering with workspaces
 [workspace]

diff --git a/nearby/presence/CMakeLists.txt b/nearby/presence/CMakeLists.txt
index 9670c34..ec93edd 100644
--- a/nearby/presence/CMakeLists.txt
+++ b/nearby/presence/CMakeLists.txt

@@ -14,15 +14,12 @@
 
 cmake_minimum_required(VERSION 3.14)
 
-project(NearbyProtocol)
+project(NearbyPresenceProtocol)
 
-# required for designated initializers on MSVC
 set(CMAKE_CXX_STANDARD 20)
 
-# root directory of repo
 set(BETO_CORE_ROOT ${CMAKE_SOURCE_DIR}/../..)
-
-# location of external third_party dependencies
+set(NEARBY_ROOT ${CMAKE_SOURCE_DIR}/..)
 set(THIRD_PARTY_DIR ${BETO_CORE_ROOT}/third_party)
 
 set(CMAKE_C_FLAGS_DEBUG "-DDEBUG")
@@ -32,13 +29,6 @@
     set(CMAKE_CXX_FLAGS_DEBUG "-g ${CMAKE_C_FLAGS_DEBUG}")
 endif ()
 
-find_package(OpenSSL REQUIRED)
-if (OPENSSL_FOUND)
-    message(STATUS "OpenSSL Found: ${OPENSSL_VERSION}")
-    message(STATUS "OpenSSL Include: ${OPENSSL_INCLUDE_DIR}")
-    message(STATUS "OpenSSL Libraries: ${OPENSSL_LIBRARIES}")
-endif ()
-
 if (MSVC)
     add_compile_options(-W4 -O1 -MD)
 endif ()
@@ -46,6 +36,10 @@
 if (ENABLE_TESTS)
     message(STATUS "Enabling workspace wide tests")
 
+    # We want to suppress warnings coming from external libraries as they just
+    # pollute the build output
+    add_compile_options(-w)
+
     # Setup GoogleTest
     include(FetchContent)
     FetchContent_Declare(
@@ -69,19 +63,42 @@
     )
 endif ()
 
-# Add these compile options for our own code, not needed for the above deps
-if (UNIX)
-    add_compile_options(-Wall -Wextra -Wimplicit-fallthrough -Wextra-semi
-            -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi
-            -Wshadow
-            -Wsign-compare)
-endif()
+set(ABSL_PROPAGATE_CXX_STD ON)
+if (ENABLE_FUZZ)
+    if (NOT "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+        MESSAGE(FATAL_ERROR "fuzzing is only enabed when building with Clang, please set CC and CXX to use clang instead of ${CMAKE_CXX_COMPILER_ID}")
+    endif()
 
+    add_subdirectory(${THIRD_PARTY_DIR}/boringssl boringssl-build)
+    add_subdirectory(${THIRD_PARTY_DIR}/fuzztest fuzztest-build)
+    enable_testing()
+    include(GoogleTest)
+else ()
+    # fuzztest handles pulling in absl, so we if we are not building fuzzers we need
+    # to include it ourselves via third_party.
+    add_subdirectory(${THIRD_PARTY_DIR}/abseil-cpp ${THIRD_PARTY_DIR}/abseil-cpp/build)
+endif ()
+
+if (UNIX)
+    set_directory_properties(
+            PROPERTIES
+            COMPILE_OPTIONS
+            -Wall -Wextra -Wimplicit-fallthrough -Wextra-semi
+            -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi
+            -Wshadow -Wsign-compare
+    )
+endif ()
+
+# rust std lib requires linking against these
+if (UNIX)
+    link_libraries(
+            dl pthread -fsanitize=address
+    )
+elseif (MSVC)
+    link_libraries(
+            bcrypt ntdll userenv ws2_32
+    )
+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 ()
+add_subdirectory(ldt_np_adv_ffi/c)

diff --git a/nearby/presence/README.md b/nearby/presence/README.md
index fe63af1..e7868b5 100644
--- a/nearby/presence/README.md
+++ b/nearby/presence/README.md

@@ -59,17 +59,6 @@
 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:
-
-```
-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
 

diff --git a/nearby/presence/ldt/fuzz/Cargo.lock b/nearby/presence/ldt/fuzz/Cargo.lock
index 419d9e9..3298a9e 100644
--- a/nearby/presence/ldt/fuzz/Cargo.lock
+++ b/nearby/presence/ldt/fuzz/Cargo.lock

@@ -55,9 +55,9 @@
 
 [[package]]
 name = "arbitrary"
-version = "1.3.0"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
+checksum = "7d5a26814d8dcb93b0e5a0ff3c6d80a8843bafb21b39e8e18a6f05471870e110"
 dependencies = [
  "derive_arbitrary",
 ]
@@ -92,9 +92,9 @@
 
 [[package]]
 name = "bytes"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "cbc"
@@ -107,11 +107,12 @@
 
 [[package]]
 name = "cc"
-version = "1.0.79"
+version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
 dependencies = [
  "jobserver",
+ "libc",
 ]
 
 [[package]]
@@ -132,24 +133,24 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.4"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.9"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.2"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -211,9 +212,9 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0"
+version = "4.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
+checksum = "0a677b8922c94e01bdbb12126b0bc852f00447528dee1782229af9c720c3f348"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -227,9 +228,9 @@
 
 [[package]]
 name = "curve25519-dalek-derive"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -238,9 +239,9 @@
 
 [[package]]
 name = "der"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
+checksum = "fffa369a668c8af7dbf8b5e56c9f744fbd399949ed171606040001947de40b1c"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -248,9 +249,9 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.1"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
+checksum = "67e77553c4162a157adbf834ebae5b415acbecbeafc7a74b0e886657506a7611"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -270,30 +271,31 @@
 
 [[package]]
 name = "ed25519"
-version = "2.2.1"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fb04eee5d9d907f29e80ee6b0e78f7e2c82342c63e3580d8c4f69d9d5aad963"
+checksum = "115531babc129696a58c64a4fef0a8bf9e9698629fb97e9e40767d235cfbcd53"
 dependencies = [
  "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+checksum = "4a3daa8e81a3963a60642bcc1f90a670680bd4a77535faa384e9d1c79d620871"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
  "rand_core",
  "sha2",
+ "subtle",
 ]
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.5"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -320,9 +322,9 @@
 
 [[package]]
 name = "fiat-crypto"
-version = "0.1.20"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+checksum = "1676f435fc1dadde4d03e43f5d62b259e1ce5f40bd4ffb21db2b42ebe59c1382"
 
 [[package]]
 name = "generic-array"
@@ -337,9 +339,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.10"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
 dependencies = [
  "cfg-if",
  "libc",
@@ -369,9 +371,9 @@
 
 [[package]]
 name = "hkdf"
-version = "0.12.3"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791a029f6b9fc27657f6f188ec6e5e43f6911f6f878e0dc5501396e09809d437"
+checksum = "7b5f8eb2ad728638ea2c7d47a21db23b7b58a72ed6a38256b8a1849f15fbbdf7"
 dependencies = [
  "hmac",
 ]
@@ -397,9 +399,9 @@
 
 [[package]]
 name = "jobserver"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
+checksum = "8c37f63953c4c63420ed5fd3d6d398c719489b9f872b9fa683262f8edd363c7d"
 dependencies = [
  "libc",
 ]
@@ -432,15 +434,15 @@
 
 [[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "libfuzzer-sys"
-version = "0.4.6"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "beb09950ae85a0a94b27676cccf37da5ff13f27076aa1adbc6545dd0d0e1bd4e"
+checksum = "a96cfd5557eb82f2b83fed4955246c988d331975a002961b07c81584d107e7f7"
 dependencies = [
  "arbitrary",
  "cc",
@@ -449,9 +451,9 @@
 
 [[package]]
 name = "once_cell"
-version = "1.18.0"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "opaque-debug"
@@ -471,9 +473,9 @@
 
 [[package]]
 name = "platforms"
-version = "3.0.2"
+version = "3.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+checksum = "626dec3cac7cc0e1577a2ec3fc496277ec2baa084bebad95bb6fdbfae235f84c"
 
 [[package]]
 name = "polyval"
@@ -495,27 +497,27 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.2"
+version = "0.13.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
+checksum = "353e1ca18966c16d9deb1c69278edbc5f194139612772bd9537af60ac231e1e6"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.31"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -572,15 +574,15 @@
 
 [[package]]
 name = "semver"
-version = "1.0.18"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+checksum = "b97ed7a9823b74f99c7742f5336af7be5ecd3eeafcb1507d1fa93347b1d589b0"
 
 [[package]]
 name = "sha2"
-version = "0.10.7"
+version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -589,9 +591,9 @@
 
 [[package]]
 name = "signature"
-version = "2.1.0"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
+checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
 
 [[package]]
 name = "subtle"
@@ -601,9 +603,9 @@
 
 [[package]]
 name = "syn"
-version = "2.0.26"
+version = "2.0.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
+checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -618,15 +620,15 @@
 
 [[package]]
 name = "typenum"
-version = "1.16.0"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.11"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "universal-hash"
@@ -652,9 +654,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb66477291e7e8d2b0ff1bcb900bf29489a9692816d79874bea351e7a8b6de96"
+checksum = "c7e468321c81fb07fa7f4c636c3972b9100f0346e5b6a9f2bd0603a52f7ed277"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
@@ -671,6 +673,6 @@
 
 [[package]]
 name = "zeroize"
-version = "1.6.0"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
+checksum = "525b4ec142c6b68a2d10f01f7bbf6755599ca3f81ea53b8431b7dd348f5fdb2d"

diff --git a/nearby/presence/ldt_np_adv/Cargo.toml b/nearby/presence/ldt_np_adv/Cargo.toml
index 3f19bdd..ce84505 100644
--- a/nearby/presence/ldt_np_adv/Cargo.toml
+++ b/nearby/presence/ldt_np_adv/Cargo.toml

@@ -21,7 +21,6 @@
 
 [dev-dependencies]
 crypto_provider_default = { workspace = true, features = ["rustcrypto", "std"] }
-crypto_provider_openssl.workspace = true
 rand_ext.workspace = true
 test_helper.workspace = true
 

diff --git a/nearby/presence/ldt_np_adv/benches/ldt_adv_scan.rs b/nearby/presence/ldt_np_adv/benches/ldt_adv_scan.rs
index 7c0b4aa..b8de6fd 100644
--- a/nearby/presence/ldt_np_adv/benches/ldt_adv_scan.rs
+++ b/nearby/presence/ldt_np_adv/benches/ldt_adv_scan.rs

@@ -21,8 +21,7 @@
 use rand::{Rng as _, SeedableRng as _};
 
 use crypto_provider::CryptoProvider;
-use crypto_provider_openssl::Openssl;
-use crypto_provider_rustcrypto::RustCrypto;
+use crypto_provider_default::CryptoProviderImpl;
 
 use np_hkdf::NpKeySeedHkdf;
 
@@ -57,7 +56,7 @@
     }
 }
 
-criterion_group!(benches, ldt_adv_scan::<RustCrypto>, ldt_adv_scan::<Openssl>);
+criterion_group!(benches, ldt_adv_scan::<CryptoProviderImpl>);
 criterion_main!(benches);
 
 fn find_matching_item<C: CryptoProvider>(

diff --git a/nearby/presence/ldt_np_adv/fuzz/Cargo.lock b/nearby/presence/ldt_np_adv/fuzz/Cargo.lock
index 6b6ef4b..0a85bd9 100644
--- a/nearby/presence/ldt_np_adv/fuzz/Cargo.lock
+++ b/nearby/presence/ldt_np_adv/fuzz/Cargo.lock

@@ -55,9 +55,9 @@
 
 [[package]]
 name = "arbitrary"
-version = "1.3.0"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
+checksum = "7d5a26814d8dcb93b0e5a0ff3c6d80a8843bafb21b39e8e18a6f05471870e110"
 dependencies = [
  "derive_arbitrary",
 ]
@@ -96,9 +96,9 @@
 
 [[package]]
 name = "bytes"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "cbc"
@@ -111,11 +111,12 @@
 
 [[package]]
 name = "cc"
-version = "1.0.79"
+version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
 dependencies = [
  "jobserver",
+ "libc",
 ]
 
 [[package]]
@@ -136,24 +137,24 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.4"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.9"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.2"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -215,9 +216,9 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0"
+version = "4.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
+checksum = "0a677b8922c94e01bdbb12126b0bc852f00447528dee1782229af9c720c3f348"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -231,9 +232,9 @@
 
 [[package]]
 name = "curve25519-dalek-derive"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -242,9 +243,9 @@
 
 [[package]]
 name = "der"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
+checksum = "fffa369a668c8af7dbf8b5e56c9f744fbd399949ed171606040001947de40b1c"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -252,9 +253,9 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.1"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
+checksum = "67e77553c4162a157adbf834ebae5b415acbecbeafc7a74b0e886657506a7611"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -274,30 +275,31 @@
 
 [[package]]
 name = "ed25519"
-version = "2.2.1"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fb04eee5d9d907f29e80ee6b0e78f7e2c82342c63e3580d8c4f69d9d5aad963"
+checksum = "115531babc129696a58c64a4fef0a8bf9e9698629fb97e9e40767d235cfbcd53"
 dependencies = [
  "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+checksum = "4a3daa8e81a3963a60642bcc1f90a670680bd4a77535faa384e9d1c79d620871"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
  "rand_core",
  "sha2",
+ "subtle",
 ]
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.5"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -324,9 +326,9 @@
 
 [[package]]
 name = "fiat-crypto"
-version = "0.1.20"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+checksum = "1676f435fc1dadde4d03e43f5d62b259e1ce5f40bd4ffb21db2b42ebe59c1382"
 
 [[package]]
 name = "generic-array"
@@ -341,9 +343,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.10"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
 dependencies = [
  "cfg-if",
  "libc",
@@ -373,9 +375,9 @@
 
 [[package]]
 name = "hkdf"
-version = "0.12.3"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791a029f6b9fc27657f6f188ec6e5e43f6911f6f878e0dc5501396e09809d437"
+checksum = "7b5f8eb2ad728638ea2c7d47a21db23b7b58a72ed6a38256b8a1849f15fbbdf7"
 dependencies = [
  "hmac",
 ]
@@ -401,9 +403,9 @@
 
 [[package]]
 name = "jobserver"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
+checksum = "8c37f63953c4c63420ed5fd3d6d398c719489b9f872b9fa683262f8edd363c7d"
 dependencies = [
  "libc",
 ]
@@ -450,15 +452,15 @@
 
 [[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "libfuzzer-sys"
-version = "0.4.6"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "beb09950ae85a0a94b27676cccf37da5ff13f27076aa1adbc6545dd0d0e1bd4e"
+checksum = "a96cfd5557eb82f2b83fed4955246c988d331975a002961b07c81584d107e7f7"
 dependencies = [
  "arbitrary",
  "cc",
@@ -476,9 +478,9 @@
 
 [[package]]
 name = "once_cell"
-version = "1.18.0"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "opaque-debug"
@@ -498,9 +500,9 @@
 
 [[package]]
 name = "platforms"
-version = "3.0.2"
+version = "3.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+checksum = "626dec3cac7cc0e1577a2ec3fc496277ec2baa084bebad95bb6fdbfae235f84c"
 
 [[package]]
 name = "polyval"
@@ -522,27 +524,27 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.2"
+version = "0.13.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
+checksum = "353e1ca18966c16d9deb1c69278edbc5f194139612772bd9537af60ac231e1e6"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.31"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -599,15 +601,15 @@
 
 [[package]]
 name = "semver"
-version = "1.0.18"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+checksum = "b97ed7a9823b74f99c7742f5336af7be5ecd3eeafcb1507d1fa93347b1d589b0"
 
 [[package]]
 name = "sha2"
-version = "0.10.7"
+version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -616,9 +618,9 @@
 
 [[package]]
 name = "signature"
-version = "2.1.0"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
+checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
 
 [[package]]
 name = "subtle"
@@ -628,9 +630,9 @@
 
 [[package]]
 name = "syn"
-version = "2.0.26"
+version = "2.0.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
+checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -645,15 +647,15 @@
 
 [[package]]
 name = "typenum"
-version = "1.16.0"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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-name = "rand_core"
-version = "0.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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- "subtle",
- "zeroize",
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- "curve25519-dalek",
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-name = "xts_aes"
-version = "0.1.0"
-dependencies = [
- "array_ref",
- "crypto_provider",
- "ldt_tbc",
-]
-
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-name = "zeroize"
-version = "1.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/nearby/presence/ldt_np_adv_ffi/Cargo.toml b/nearby/presence/ldt_np_adv_ffi/Cargo.toml
index 829f932..fdc5501 100644
--- a/nearby/presence/ldt_np_adv_ffi/Cargo.toml
+++ b/nearby/presence/ldt_np_adv_ffi/Cargo.toml

@@ -5,41 +5,24 @@
 publish = false
 
 [dependencies]
-crypto_provider = { path = "../../crypto/crypto_provider" }
-crypto_provider_openssl = { path = "../../crypto/crypto_provider_openssl", optional = true }
-crypto_provider_rustcrypto = { path = "../../crypto/crypto_provider_rustcrypto", optional = true }
-crypto_provider_boringssl = { path = "../../crypto/crypto_provider_boringssl", optional = true }
-ldt = { path = "../ldt" }
-ldt_np_adv = { path = "../ldt_np_adv" }
-np_hkdf = { path = "../np_hkdf" }
+crypto_provider_default.workspace = true
+crypto_provider.workspace = true
+ldt.workspace = true
+ldt_np_adv.workspace = true
+np_hkdf.workspace = true
 
-cfg-if = "1.0.0"
-lazy_static = { version = "1.4.0" }
-
-# no_std only deps
-libc_alloc = { version = "1.0.4", optional = true }
-panic-abort = { version = "0.3.2", optional = true }
-spin = { version = "0.9.8", optional = true }
+cfg-if.workspace = true
+lazy_static.workspace = true
+spin = { workspace = true, optional = true }
 
 [dev-dependencies]
-rand = "0.8.5"
+rand.workspace = true
 
 [lib]
 # boringssl and bssl-sys are built as a static lib, so we need to as well
 crate-type = ["staticlib"]
 
 [features]
-# by default we support no_std and use rustcrypto primitives
-default = ["lazy_static/spin_no_std", "spin", "libc_alloc", "panic-abort", "crypto_provider_rustcrypto"]
-std = ["crypto_provider_rustcrypto", "crypto_provider_rustcrypto/std"]
-openssl = ["crypto_provider_openssl"]
-boringssl = ["crypto_provider_boringssl"]
-
-[profile.release-min-size]
-inherits = "release"
-panic = "abort"
-codegen-units = 1
-lto = true
-# z optimizes for size
-opt-level = "z"
-strip = true
+default = ["lazy_static/spin_no_std", "spin", "crypto_provider_default/rustcrypto"]
+std = ["crypto_provider_default/std", "crypto_provider_default/rustcrypto"]
+boringssl = ["crypto_provider_default/boringssl"]
\ No newline at end of file

diff --git a/nearby/presence/ldt_np_adv_ffi/c/CMakeLists.txt b/nearby/presence/ldt_np_adv_ffi/c/CMakeLists.txt
new file mode 100644
index 0000000..476b228
--- /dev/null
+++ b/nearby/presence/ldt_np_adv_ffi/c/CMakeLists.txt

@@ -0,0 +1,49 @@
+# 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 ExternalProject to ensure that the rust artifacts are built
+include(ExternalProject)
+set_directory_properties(PROPERTIES EP_PREFIX ${CMAKE_BINARY_DIR}/target/tmp)
+if (CMAKE_BUILD_TYPE STREQUAL "Debug")
+    set(CARGO_ARTIFACT_DIR debug)
+    set(CARGO_PROFILE dev)
+else ()
+    set(CARGO_ARTIFACT_DIR release)
+    set(CARGO_PROFILE release)
+endif ()
+
+ExternalProject_Add(
+        ldt_np_adv_ffi
+        DOWNLOAD_COMMAND ""
+        CONFIGURE_COMMAND ""
+        BUILD_COMMAND cargo build -p ldt_np_adv_ffi --no-default-features --features std --profile=${CARGO_PROFILE}
+        BUILD_BYPRODUCTS ${NEARBY_ROOT}/target/${CARGO_ARTIFACT_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}
+        BINARY_DIR "${NEARBY_ROOT}/target/"
+        INSTALL_COMMAND "")
+
+include_directories(${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/c/include/)
+
+add_subdirectory(sample)
+
+if (ENABLE_TESTS)
+    message(STATUS "Enabling ldt tests")
+    add_subdirectory(tests)
+    add_subdirectory(benchmarks)
+endif ()
+
+# Fuzzers won't build on windows so we need a separate flag to pull them in
+if (ENABLE_FUZZ)
+    message(STATUS "Enabling ldt fuzzers")
+    add_subdirectory(fuzz)
+endif ()

diff --git a/nearby/presence/ldt_np_adv_ffi/c/benchmarks/CMakeLists.txt b/nearby/presence/ldt_np_adv_ffi/c/benchmarks/CMakeLists.txt
new file mode 100644
index 0000000..330c5ab
--- /dev/null
+++ b/nearby/presence/ldt_np_adv_ffi/c/benchmarks/CMakeLists.txt

@@ -0,0 +1,24 @@
+# Copyright 2024 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(
+  ldt_benchmarks
+  ldt_benchmarks.cc
+)
+
+target_link_libraries(
+  ldt_benchmarks
+  "${NEARBY_ROOT}/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+  benchmark::benchmark
+)

diff --git a/nearby/presence/ldt_np_c_sample/tests/ldt_benchmarks.cc b/nearby/presence/ldt_np_adv_ffi/c/benchmarks/ldt_benchmarks.cc
similarity index 100%
rename from nearby/presence/ldt_np_c_sample/tests/ldt_benchmarks.cc
rename to nearby/presence/ldt_np_adv_ffi/c/benchmarks/ldt_benchmarks.cc

diff --git a/nearby/presence/ldt_np_adv_ffi/c/fuzz/CMakeLists.txt b/nearby/presence/ldt_np_adv_ffi/c/fuzz/CMakeLists.txt
new file mode 100644
index 0000000..3c64c8e
--- /dev/null
+++ b/nearby/presence/ldt_np_adv_ffi/c/fuzz/CMakeLists.txt

@@ -0,0 +1,30 @@
+# 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.
+
+fuzztest_setup_fuzzing_flags()
+
+add_executable(
+        ldt_fuzzer
+        ldt_fuzzer.cc
+)
+
+target_link_libraries(
+        ldt_fuzzer
+        PRIVATE
+        optimized "${NEARBY_ROOT}/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        debug "${NEARBY_ROOT}/target/debug/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        ssl)
+
+link_fuzztest(ldt_fuzzer)
+gtest_discover_tests(ldt_fuzzer)
\ No newline at end of file

diff --git a/nearby/presence/ldt_np_adv_ffi/c/fuzz/ldt_fuzzer.cc b/nearby/presence/ldt_np_adv_ffi/c/fuzz/ldt_fuzzer.cc
new file mode 100644
index 0000000..dbe136d
--- /dev/null
+++ b/nearby/presence/ldt_np_adv_ffi/c/fuzz/ldt_fuzzer.cc

@@ -0,0 +1,125 @@
+/*
+ * 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 <array>
+#include <vector>
+
+#include "fuzztest/fuzztest.h"
+#include "gtest/gtest.h"
+#include "np_ldt.h"
+#include "openssl/digest.h"
+#include "openssl/hkdf.h"
+#include "openssl/hmac.h"
+#include "openssl/obj_mac.h"
+
+void LdtDecryptBadMac(std::array<uint8_t, 32> key_seed_bytes,
+                      std::array<uint8_t, 2> salt_bytes,
+                      std::vector<uint8_t> plaintext_bytes,
+                      std::array<uint8_t, 32> metadata_key_hmac_tag_bytes) {
+  NpLdtKeySeed key_seed;
+  memcpy(key_seed.bytes, key_seed_bytes.data(), key_seed_bytes.size());
+
+  NpLdtSalt salt;
+  memcpy(salt.bytes, salt_bytes.data(), salt_bytes.size());
+
+  NpMetadataKeyHmac metadata_key_hmac;
+  memcpy(metadata_key_hmac.bytes, metadata_key_hmac_tag_bytes.data(),
+         metadata_key_hmac_tag_bytes.size());
+
+  auto enc_handle = NpLdtEncryptCreate(key_seed);
+  EXPECT_NE(0, enc_handle.handle);
+
+  auto result = NpLdtEncrypt(enc_handle, plaintext_bytes.data(),
+                             plaintext_bytes.size(), salt);
+  EXPECT_EQ(NP_LDT_RESULT::NP_LDT_SUCCESS, result);
+
+  auto dec_handle = NpLdtDecryptCreate(key_seed, metadata_key_hmac);
+  EXPECT_NE(0, dec_handle.handle);
+  result = NpLdtDecryptAndVerify(dec_handle, plaintext_bytes.data(),
+                                 plaintext_bytes.size(), salt);
+  EXPECT_EQ(NP_LDT_RESULT::NP_LDT_ERROR_MAC_MISMATCH, result)
+      << "we expect mac mismatch since we're using a random mac";
+
+  result = NpLdtEncryptClose(enc_handle);
+  EXPECT_EQ(NP_LDT_RESULT::NP_LDT_SUCCESS, result);
+
+  result = NpLdtDecryptClose(dec_handle);
+  EXPECT_EQ(NP_LDT_RESULT::NP_LDT_SUCCESS, result);
+}
+
+FUZZ_TEST(LdtFuzzers, LdtDecryptBadMac)
+    .WithDomains(fuzztest::Arbitrary<std::array<uint8_t, 32>>(),
+                 fuzztest::Arbitrary<std::array<uint8_t, 2>>(),
+                 fuzztest::Arbitrary<std::vector<uint8_t>>()
+                     .WithMinSize(16)
+                     .WithMaxSize(31),
+                 fuzztest::Arbitrary<std::array<uint8_t, 32>>());
+
+void LdtDecryptCorrectMac(std::array<uint8_t, 32> key_seed_bytes,
+                          std::array<uint8_t, 2> salt_bytes,
+                          std::vector<uint8_t> plaintext_bytes) {
+  NpLdtKeySeed key_seed;
+  memcpy(key_seed.bytes, key_seed_bytes.data(), key_seed_bytes.size());
+
+  NpLdtSalt salt;
+  memcpy(salt.bytes, salt_bytes.data(), salt_bytes.size());
+
+  // calculate metadata key hmac key by HKDFing key seed
+  // Reference:
+  // https://commondatastorage.googleapis.com/chromium-boringssl-docs/hkdf.h.html
+  // 32 byte HMAC-SHA256 key
+  uint8_t metadata_key_hmac_key[32] = {0};
+  auto result = HKDF(
+      metadata_key_hmac_key, sizeof(metadata_key_hmac_key), EVP_sha256(),
+      (const uint8_t *)&key_seed.bytes, (size_t)32,
+      (const uint8_t *)"Google Nearby", (size_t)13,
+      (const uint8_t *)"Legacy metadata key verification HMAC key", (size_t)41);
+  EXPECT_EQ(1, result);
+  // calculate metadata key hmac using hkdf'd hmac key
+  NpMetadataKeyHmac metadata_key_hmac = {.bytes = {0}};
+  // will be written to by HMAC call, but it will always be
+  // 32 because that's what SHA256 outputs
+  unsigned int md_len = 32;
+  // first 14 bytes of payload are metadata key
+  HMAC(EVP_sha256(), metadata_key_hmac_key, 32, plaintext_bytes.data(), 14,
+       metadata_key_hmac.bytes, &md_len);
+
+  auto enc_handle = NpLdtEncryptCreate(key_seed);
+  EXPECT_NE(0, enc_handle.handle);
+
+  result = NpLdtEncrypt(enc_handle, plaintext_bytes.data(),
+                        plaintext_bytes.size(), salt);
+  EXPECT_EQ(NP_LDT_RESULT::NP_LDT_SUCCESS, result);
+
+  auto dec_handle = NpLdtDecryptCreate(key_seed, metadata_key_hmac);
+  EXPECT_NE(0, dec_handle.handle);
+  result = NpLdtDecryptAndVerify(dec_handle, plaintext_bytes.data(),
+                                 plaintext_bytes.size(), salt);
+  EXPECT_EQ(NP_LDT_RESULT::NP_LDT_SUCCESS, result);
+
+  result = NpLdtEncryptClose(enc_handle);
+  EXPECT_EQ(NP_LDT_RESULT::NP_LDT_SUCCESS, result);
+
+  result = NpLdtDecryptClose(dec_handle);
+  EXPECT_EQ(NP_LDT_RESULT::NP_LDT_SUCCESS, result);
+}
+
+FUZZ_TEST(LdtFuzzers, LdtDecryptCorrectMac)
+    .WithDomains(fuzztest::Arbitrary<std::array<uint8_t, 32>>(),
+                 fuzztest::Arbitrary<std::array<uint8_t, 2>>(),
+                 fuzztest::Arbitrary<std::vector<uint8_t>>()
+                     .WithMinSize(16)
+                     .WithMaxSize(31));

diff --git a/nearby/presence/ldt_np_adv_ffi/include/np_ldt.h b/nearby/presence/ldt_np_adv_ffi/c/include/np_ldt.h
similarity index 100%
rename from nearby/presence/ldt_np_adv_ffi/include/np_ldt.h
rename to nearby/presence/ldt_np_adv_ffi/c/include/np_ldt.h

diff --git a/nearby/presence/ldt_np_adv_ffi/c/sample/CMakeLists.txt b/nearby/presence/ldt_np_adv_ffi/c/sample/CMakeLists.txt
new file mode 100644
index 0000000..a18f15e
--- /dev/null
+++ b/nearby/presence/ldt_np_adv_ffi/c/sample/CMakeLists.txt

@@ -0,0 +1,19 @@
+# Copyright 2024 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(ldt_c_sample main.c)
+
+target_link_libraries(
+        ldt_c_sample
+        "${NEARBY_ROOT}/target/${CARGO_ARTIFACT_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+)
\ No newline at end of file

diff --git a/nearby/presence/ldt_np_c_sample/main.c b/nearby/presence/ldt_np_adv_ffi/c/sample/main.c
similarity index 100%
rename from nearby/presence/ldt_np_c_sample/main.c
rename to nearby/presence/ldt_np_adv_ffi/c/sample/main.c

diff --git a/nearby/presence/ldt_np_adv_ffi/c/tests/CMakeLists.txt b/nearby/presence/ldt_np_adv_ffi/c/tests/CMakeLists.txt
new file mode 100644
index 0000000..a4cbc24
--- /dev/null
+++ b/nearby/presence/ldt_np_adv_ffi/c/tests/CMakeLists.txt

@@ -0,0 +1,30 @@
+# 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.
+
+file(COPY ${CMAKE_SOURCE_DIR}/ldt_np_adv/resources/test/np_adv_test_vectors.json
+     DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+
+add_executable(
+  ldt_ffi_tests
+  ldt_ffi_tests.cc
+)
+
+target_link_libraries(
+  ldt_ffi_tests
+  "${NEARBY_ROOT}/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}ldt_np_adv_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
+  jsoncpp
+  GTest::gtest_main
+)
+
+gtest_discover_tests(ldt_ffi_tests)
\ No newline at end of file

diff --git a/nearby/presence/ldt_np_c_sample/tests/ldt_ffi_tests.cc b/nearby/presence/ldt_np_adv_ffi/c/tests/ldt_ffi_tests.cc
similarity index 100%
rename from nearby/presence/ldt_np_c_sample/tests/ldt_ffi_tests.cc
rename to nearby/presence/ldt_np_adv_ffi/c/tests/ldt_ffi_tests.cc

diff --git a/nearby/presence/ldt_np_adv_ffi/deny.toml b/nearby/presence/ldt_np_adv_ffi/deny.toml
deleted file mode 100644
index ca51e11..0000000
--- a/nearby/presence/ldt_np_adv_ffi/deny.toml
+++ /dev/null

@@ -1,213 +0,0 @@
-# This template contains all of the possible sections and their default values
-
-# Note that all fields that take a lint level have these possible values:
-# * deny - An error will be produced and the check will fail
-# * warn - A warning will be produced, but the check will not fail
-# * allow - No warning or error will be produced, though in some cases a note
-# will be
-
-# The values provided in this template are the default values that will be used
-# when any section or field is not specified in your own configuration
-
-# If 1 or more target triples (and optionally, target_features) are specified,
-# only the specified targets will be checked when running `cargo deny check`.
-# This means, if a particular package is only ever used as a target specific
-# dependency, such as, for example, the `nix` crate only being used via the
-# `target_family = "unix"` configuration, that only having windows targets in
-# this list would mean the nix crate, as well as any of its exclusive
-# dependencies not shared by any other crates, would be ignored, as the target
-# list here is effectively saying which targets you are building for.
-targets = [
-    # The triple can be any string, but only the target triples built in to
-    # rustc (as of 1.40) can be checked against actual config expressions
-    #{ triple = "x86_64-unknown-linux-musl" },
-    # You can also specify which target_features you promise are enabled for a
-    # particular target. target_features are currently not validated against
-    # the actual valid features supported by the target architecture.
-    #{ triple = "wasm32-unknown-unknown", features = ["atomics"] },
-]
-
-# This section is considered when running `cargo deny check advisories`
-# More documentation for the advisories section can be found here:
-# https://embarkstudios.github.io/cargo-deny/checks/advisories/cfg.html
-[advisories]
-# The path where the advisory database is cloned/fetched into
-db-path = "~/.cargo/advisory-db"
-# The url(s) of the advisory databases to use
-db-urls = ["https://github.com/rustsec/advisory-db"]
-# The lint level for security vulnerabilities
-vulnerability = "deny"
-# The lint level for unmaintained crates
-unmaintained = "warn"
-# The lint level for crates that have been yanked from their source registry
-yanked = "warn"
-# The lint level for crates with security notices. Note that as of
-# 2019-12-17 there are no security notice advisories in
-# https://github.com/rustsec/advisory-db
-notice = "warn"
-# A list of advisory IDs to ignore. Note that ignored advisories will still
-# output a note when they are encountered.
-ignore = [
-    #"RUSTSEC-0000-0000",
-]
-# Threshold for security vulnerabilities, any vulnerability with a CVSS score
-# lower than the range specified will be ignored. Note that ignored advisories
-# will still output a note when they are encountered.
-# * None - CVSS Score 0.0
-# * Low - CVSS Score 0.1 - 3.9
-# * Medium - CVSS Score 4.0 - 6.9
-# * High - CVSS Score 7.0 - 8.9
-# * Critical - CVSS Score 9.0 - 10.0
-#severity-threshold =
-
-# If this is true, then cargo deny will use the git executable to fetch advisory database.
-# If this is false, then it uses a built-in git library.
-# Setting this to true can be helpful if you have special authentication requirements that cargo-deny does not support.
-# See Git Authentication for more information about setting up git authentication.
-#git-fetch-with-cli = true
-
-# This section is considered when running `cargo deny check licenses`
-# More documentation for the licenses section can be found here:
-# https://embarkstudios.github.io/cargo-deny/checks/licenses/cfg.html
-[licenses]
-# The lint level for crates which do not have a detectable license
-unlicensed = "deny"
-# List of explicitly allowed licenses
-# See https://spdx.org/licenses/ for list of possible licenses
-# [possible values: any SPDX 3.11 short identifier (+ optional exception)].
-allow = [
-    "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
-# [possible values: any SPDX 3.11 short identifier (+ optional exception)].
-deny = [
-    #"Nokia",
-]
-# Lint level for licenses considered copyleft
-copyleft = "warn"
-# Blanket approval or denial for OSI-approved or FSF Free/Libre licenses
-# * both - The license will be approved if it is both OSI-approved *AND* FSF
-# * either - The license will be approved if it is either OSI-approved *OR* FSF
-# * osi-only - The license will be approved if is OSI-approved *AND NOT* FSF
-# * fsf-only - The license will be approved if is FSF *AND NOT* OSI-approved
-# * neither - This predicate is ignored and the default lint level is used
-allow-osi-fsf-free = "neither"
-# Lint level used when no other predicates are matched
-# 1. License isn't in the allow or deny lists
-# 2. License isn't copyleft
-# 3. License isn't OSI/FSF, or allow-osi-fsf-free = "neither"
-default = "deny"
-# The confidence threshold for detecting a license from license text.
-# The higher the value, the more closely the license text must be to the
-# canonical license text of a valid SPDX license file.
-# [possible values: any between 0.0 and 1.0].
-confidence-threshold = 0.8
-# Allow 1 or more licenses on a per-crate basis, so that particular licenses
-# aren't accepted for every possible crate as with the normal allow list
-exceptions = [
-    # Each entry is the crate and version constraint, and its specific allow
-    # list
-    #{ allow = ["Zlib"], name = "adler32", version = "*" },
-]
-
-# Some crates don't have (easily) machine readable licensing information,
-# adding a clarification entry for it allows you to manually specify the
-# licensing information
-#[[licenses.clarify]]
-# The name of the crate the clarification applies to
-#name = "ring"
-# The optional version constraint for the crate
-#version = "*"
-# The SPDX expression for the license requirements of the crate
-#expression = "MIT AND ISC AND OpenSSL"
-# One or more files in the crate's source used as the "source of truth" for
-# the license expression. If the contents match, the clarification will be used
-# when running the license check, otherwise the clarification will be ignored
-# and the crate will be checked normally, which may produce warnings or errors
-# depending on the rest of your configuration
-#license-files = [
-    # Each entry is a crate relative path, and the (opaque) hash of its contents
-    #{ path = "LICENSE", hash = 0xbd0eed23 }
-#]
-
-[[licenses.clarify]]
-name = "ring"
-version = "*"
-expression = "MIT AND ISC AND OpenSSL"
-license-files = [
-    # Each entry is a crate relative path, and the (opaque) hash of its contents
-    { path = "LICENSE", hash = 0xbd0eed23 }
-]
-
-[licenses.private]
-# If true, ignores workspace crates that aren't published, or are only
-# published to private registries.
-# To see how to mark a crate as unpublished (to the official registry),
-# visit https://doc.rust-lang.org/cargo/reference/manifest.html#the-publish-field.
-ignore = true
-# One or more private registries that you might publish crates to, if a crate
-# is only published to private registries, and ignore is true, the crate will
-# not have its license(s) checked
-registries = [
-    #"https://sekretz.com/registry
-]
-
-# This section is considered when running `cargo deny check bans`.
-# More documentation about the 'bans' section can be found here:
-# https://embarkstudios.github.io/cargo-deny/checks/bans/cfg.html
-[bans]
-# Lint level for when multiple versions of the same crate are detected
-multiple-versions = "allow"
-# Lint level for when a crate version requirement is `*`
-wildcards = "allow"
-# The graph highlighting used when creating dotgraphs for crates
-# with multiple versions
-# * lowest-version - The path to the lowest versioned duplicate is highlighted
-# * simplest-path - The path to the version with the fewest edges is highlighted
-# * all - Both lowest-version and simplest-path are used
-highlight = "all"
-# List of crates that are allowed. Use with care!
-allow = [
-    #{ name = "ansi_term", version = "=0.11.0" },
-]
-# List of crates to deny
-deny = [
-    # Each entry the name of a crate and a version range. If version is
-    # not specified, all versions will be matched.
-    #{ name = "ansi_term", version = "=0.11.0" },
-    #
-    # Wrapper crates can optionally be specified to allow the crate when it
-    # is a direct dependency of the otherwise banned crate
-    #{ name = "ansi_term", version = "=0.11.0", wrappers = [] },
-]
-# Certain crates/versions that will be skipped when doing duplicate detection.
-skip = [
-    #{ name = "ansi_term", version = "=0.11.0" },
-]
-# Similarly to `skip` allows you to skip certain crates during duplicate
-# detection. Unlike skip, it also includes the entire tree of transitive
-# dependencies starting at the specified crate, up to a certain depth, which is
-# by default infinite
-skip-tree = [
-    #{ name = "ansi_term", version = "=0.11.0", depth = 20 },
-]
-
-# This section is considered when running `cargo deny check sources`.
-# More documentation about the 'sources' section can be found here:
-# https://embarkstudios.github.io/cargo-deny/checks/sources/cfg.html
-[sources]
-# Lint level for what to happen when a crate from a crate registry that is not
-# in the allow list is encountered
-unknown-registry = "warn"
-# Lint level for what to happen when a crate from a git repository that is not
-# in the allow list is encountered
-unknown-git = "warn"
-# List of URLs for allowed crate registries. Defaults to the crates.io index
-# if not specified. If it is specified but empty, no registries are allowed.
-allow-registry = ["https://github.com/rust-lang/crates.io-index"]
-# List of URLs for allowed Git repositories
-allow-git = []
\ No newline at end of file

diff --git a/nearby/presence/ldt_np_adv_ffi/rust-toolchain.toml b/nearby/presence/ldt_np_adv_ffi/rust-toolchain.toml
deleted file mode 100644
index 271800c..0000000
--- a/nearby/presence/ldt_np_adv_ffi/rust-toolchain.toml
+++ /dev/null

@@ -1,2 +0,0 @@
-[toolchain]
-channel = "nightly"
\ No newline at end of file

diff --git a/nearby/presence/ldt_np_adv_ffi/src/handle_map.rs b/nearby/presence/ldt_np_adv_ffi/src/handle_map.rs
index 9d83c19..9a19562 100644
--- a/nearby/presence/ldt_np_adv_ffi/src/handle_map.rs
+++ b/nearby/presence/ldt_np_adv_ffi/src/handle_map.rs

@@ -22,7 +22,7 @@
 // Pull in the needed deps for std vs no_std
 cfg_if::cfg_if! {
     // Test pulls in std which causes duplicate errors
-    if #[cfg(any(feature = "std", test, feature = "boringssl", feature = "openssl"))] {
+    if #[cfg(any(feature = "std", test, feature = "boringssl"))] {
         use std::sync::{Mutex, MutexGuard};
         use std::collections::HashMap;
 

diff --git a/nearby/presence/ldt_np_adv_ffi/src/lib.rs b/nearby/presence/ldt_np_adv_ffi/src/lib.rs
index 1534857..839135e 100644
--- a/nearby/presence/ldt_np_adv_ffi/src/lib.rs
+++ b/nearby/presence/ldt_np_adv_ffi/src/lib.rs

@@ -12,7 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#![no_std]
 #![deny(
     missing_docs,
     clippy::indexing_slicing,
@@ -20,10 +19,6 @@
     clippy::panic,
     clippy::expect_used
 )]
-#![allow(internal_features)]
-// TODO: Remove usage of `lang_items` when ffi is no longer alloc
-// These features are needed to support no_std + alloc
-#![feature(lang_items)]
 
 //! Rust ffi wrapper of ldt_np_adv, can be called from C/C++ Clients
 
@@ -31,47 +26,15 @@
 
 use alloc::boxed::Box;
 use core::slice;
-use handle_map::get_enc_handle_map;
+use crypto_provider_default::CryptoProviderImpl;
 use ldt_np_adv::{
     build_np_adv_decrypter_from_key_seed, salt_padder, LdtAdvDecryptError, LdtEncrypterXtsAes128,
     LdtNpAdvDecrypterXtsAes128, LegacySalt,
 };
 use np_hkdf::NpKeySeedHkdf;
 
-use crate::handle_map::get_dec_handle_map;
-
 mod handle_map;
 
-// Pull in the needed deps for std vs no_std
-cfg_if::cfg_if! {
-    // Test pulls in std which causes duplicate errors
-    if #[cfg(any(feature = "std", test, feature = "boringssl", feature = "openssl"))] {
-        extern crate std;
-    } else {
-        // Allow using Box in no_std
-        mod no_std;
-    }
-}
-
-// Fail early for invalid combination of feature flags, we need at least one crypto library specified
-#[cfg(all(
-    not(feature = "openssl"),
-    not(feature = "crypto_provider_rustcrypto"),
-    not(feature = "boringssl")
-))]
-compile_error!("Either the \"openssl\", \"boringssl\"or \"default\" features flag needs to be set in order to specify cryptographic library");
-
-// Need to have one of the crypto provider impls
-cfg_if::cfg_if! {
-    if #[cfg(feature = "openssl")] {
-        use crypto_provider_openssl::Openssl as CryptoProviderImpl;
-    } else if #[cfg(feature = "boringssl")]{
-        use crypto_provider_boringssl::Boringssl as CryptoProviderImpl;
-    } else {
-        use crypto_provider_rustcrypto::RustCrypto as CryptoProviderImpl;
-    }
-}
-
 pub(crate) type LdtAdvDecrypter = LdtNpAdvDecrypterXtsAes128<CryptoProviderImpl>;
 pub(crate) type LdtAdvEncrypter = LdtEncrypterXtsAes128<CryptoProviderImpl>;
 
@@ -111,7 +74,7 @@
         &NpKeySeedHkdf::new(&key_seed.bytes),
         metadata_key_hmac.bytes,
     );
-    let handle = get_dec_handle_map().insert::<CryptoProviderImpl>(Box::new(cipher));
+    let handle = handle_map::get_dec_handle_map().insert::<CryptoProviderImpl>(Box::new(cipher));
     NpLdtDecryptHandle { handle }
 }
 
@@ -120,14 +83,14 @@
     let cipher = LdtAdvEncrypter::new(
         &NpKeySeedHkdf::<CryptoProviderImpl>::new(&key_seed.bytes).legacy_ldt_key(),
     );
-    let handle = get_enc_handle_map().insert::<CryptoProviderImpl>(Box::new(cipher));
+    let handle = handle_map::get_enc_handle_map().insert::<CryptoProviderImpl>(Box::new(cipher));
     NpLdtEncryptHandle { handle }
 }
 
 #[no_mangle]
 extern "C" fn NpLdtEncryptClose(handle: NpLdtEncryptHandle) -> i32 {
     map_to_error_code(|| {
-        get_enc_handle_map()
+        handle_map::get_enc_handle_map()
             .remove(&handle.handle)
             .ok_or(CloseCipherError::InvalidHandle)
             .map(|_| SUCCESS)
@@ -137,7 +100,7 @@
 #[no_mangle]
 extern "C" fn NpLdtDecryptClose(handle: NpLdtDecryptHandle) -> i32 {
     map_to_error_code(|| {
-        get_dec_handle_map()
+        handle_map::get_dec_handle_map()
             .remove(&handle.handle)
             .ok_or(CloseCipherError::InvalidHandle)
             .map(|_| SUCCESS)
@@ -154,7 +117,7 @@
     map_to_error_code(|| {
         let data = unsafe { slice::from_raw_parts_mut(buffer, buffer_len) };
         let padder = salt_padder::<16, CryptoProviderImpl>(LegacySalt::from(salt.bytes));
-        get_enc_handle_map()
+        handle_map::get_enc_handle_map()
             .get(&handle.handle)
             .map(|cipher| {
                 cipher.encrypt(data, &padder).map(|_| 0).map_err(|e| match e {
@@ -176,7 +139,7 @@
         let data = unsafe { slice::from_raw_parts_mut(buffer, buffer_len) };
         let padder = salt_padder::<16, CryptoProviderImpl>(LegacySalt::from(salt.bytes));
 
-        get_dec_handle_map()
+        handle_map::get_dec_handle_map()
             .get(&handle.handle)
             .map(|cipher| {
                 cipher

diff --git a/nearby/presence/ldt_np_adv_ffi_fuzz/CMakeLists.txt b/nearby/presence/ldt_np_adv_ffi_fuzz/CMakeLists.txt
deleted file mode 100644
index 2144811..0000000
--- a/nearby/presence/ldt_np_adv_ffi_fuzz/CMakeLists.txt
+++ /dev/null

@@ -1,47 +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.
-
-cmake_minimum_required(VERSION 3.0)
-
-# libfuzzer needs clang
-SET(CMAKE_C_COMPILER "clang")
-
-include_directories(
-        ${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?
-add_compile_options(-fsanitize=fuzzer,address)
-
-# 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)
-    message(STATUS "OpenSSL Found: ${OPENSSL_VERSION}")
-    message(STATUS "OpenSSL Include: ${OPENSSL_INCLUDE_DIR}")
-    message(STATUS "OpenSSL Libraries: ${OPENSSL_LIBRARIES}")
-endif ()
-
-add_executable(fuzzer_decrypt_bad_mac src/fuzzer_decrypt_bad_mac.c)
-target_link_libraries(fuzzer_decrypt_bad_mac
-        optimized "${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${CMAKE_STATIC_LIBRARY_SUFFIX}"
-        dl pthread -fsanitize=fuzzer,address)
-target_link_libraries(fuzzer_decrypt_bad_mac OpenSSL::SSL)
-
-add_executable(fuzzer_decrypt_correct_mac src/fuzzer_decrypt_correct_mac.c)
-target_link_libraries(fuzzer_decrypt_correct_mac
-        optimized "${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)
-target_link_libraries(fuzzer_decrypt_correct_mac OpenSSL::SSL)

diff --git a/nearby/presence/ldt_np_adv_ffi_fuzz/src/fuzzer_decrypt_bad_mac.c b/nearby/presence/ldt_np_adv_ffi_fuzz/src/fuzzer_decrypt_bad_mac.c
deleted file mode 100644
index 18abb0f..0000000
--- a/nearby/presence/ldt_np_adv_ffi_fuzz/src/fuzzer_decrypt_bad_mac.c
+++ /dev/null

@@ -1,102 +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 <openssl/aes.h>
-#include <stddef.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "np_ldt.h"
-
-// Fuzz decrypting data that doesn't match the hmac
-int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  // data:
-  // 32 byte key seed
-  // 2 byte salt
-  // 31 byte plaintext
-  // 1 byte length of plaintext to use
-  // 32 byte metadata key hmac
-  if (size < 98) {
-    return -1;
-  }
-
-  NpLdtKeySeed key_seed;
-  memcpy(&key_seed.bytes, data, 32);
-
-  NpLdtSalt salt;
-  memcpy(&salt.bytes, data + 32, 2);
-
-  uint8_t payload[31];
-  memcpy(&payload, data + 32 + 2, 31);
-
-  uint8_t payload_len;
-  memcpy(&payload_len, data + 32 + 2 + 31, 1);
-  // length in [16, 31]
-  payload_len = 16 + (payload_len % 16);
-
-  NpMetadataKeyHmac metadata_key_hmac;
-  memcpy(&metadata_key_hmac.bytes, data + 32 + 2 + 31 + 1, 32);
-
-  // create a cipher
-  NpLdtEncryptHandle enc_handle = NpLdtEncryptCreate(key_seed);
-  if (enc_handle.handle == 0) {
-    printf("Error: create LDT failed\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  // encrypt with it
-  NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, payload, payload_len, salt);
-  if (result != 0) {
-    printf("Error: encrypt\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  NpLdtDecryptHandle dec_handle = NpLdtDecryptCreate(key_seed, metadata_key_hmac);
-  if (dec_handle.handle == 0) {
-    printf("Error: create LDT failed\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  // decrypt & verify -- we expect mac mismatch since we're using a random mac
-  result = NpLdtDecryptAndVerify(dec_handle, payload, payload_len, salt);
-  if (result != -2) {
-    printf("Error: decryption didn't fail with the expected MAC mismatch\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  // deallocate the cipher
-  result = NpLdtEncryptClose(enc_handle);
-  if (result) {
-    printf("Error: close cipher\n");
-    __builtin_trap();
-    return result;
-  }
-
-  result = NpLdtDecryptClose(dec_handle);
-  if (result) {
-    printf("Error: close cipher failed\n");
-    __builtin_trap();
-    return result;
-  }
-
-  return 0;  // Values other than 0 and -1 are reserved for future use.
-}

diff --git a/nearby/presence/ldt_np_adv_ffi_fuzz/src/fuzzer_decrypt_correct_mac.c b/nearby/presence/ldt_np_adv_ffi_fuzz/src/fuzzer_decrypt_correct_mac.c
deleted file mode 100644
index e99a7e8..0000000
--- a/nearby/presence/ldt_np_adv_ffi_fuzz/src/fuzzer_decrypt_correct_mac.c
+++ /dev/null

@@ -1,145 +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 <openssl/core.h>
-#include <openssl/core_names.h>
-#include <openssl/hmac.h>
-#include <openssl/kdf.h>
-#include <openssl/obj_mac.h>
-#include <openssl/params.h>
-#include <stddef.h>
-#include <string.h>
-
-#include "np_ldt.h"
-
-// Fuzz decrypting data that doesn't match the hmac
-int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
-  // data:
-  // 32 byte key seed
-  // 2 byte salt
-  // 31 byte plaintext
-  // 1 byte length of plaintext to use
-  if (size < 66) {
-    return -1;
-  }
-
-  NpLdtKeySeed key_seed;
-  memcpy(&key_seed.bytes, data, 32);
-
-  NpLdtSalt salt;
-  memcpy(&salt.bytes, data + 32, 2);
-
-  uint8_t payload[31];
-  memcpy(&payload, data + 32 + 2, 31);
-
-  uint8_t payload_len;
-  memcpy(&payload_len, data + 32 + 2 + 31, 1);
-  // length in [16, 31]
-  payload_len = 16 + (payload_len % 16);
-
-  // calculate metadata key hmac key by HKDFing key seed
-  // HKDF code from https://www.openssl.org/docs/man3.0/man7/EVP_KDF-HKDF.html
-  EVP_KDF *kdf;
-  EVP_KDF_CTX *kctx;
-  // 32 byte HMAC-SHA256 key
-  uint8_t metadata_key_hmac_key[32] = {0};
-  OSSL_PARAM params[5], *p = params;
-
-  kdf = EVP_KDF_fetch(NULL, "HKDF", NULL);
-  if (kdf == NULL) {
-    printf("Couldn't allocate KDF\n");
-    __builtin_trap();
-    return 0;
-  }
-  kctx = EVP_KDF_CTX_new(kdf);
-  EVP_KDF_free(kdf);
-
-  *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, SN_sha256,
-                                          strlen(SN_sha256));
-  *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, &key_seed.bytes,
-                                           (size_t)32);
-  *p++ = OSSL_PARAM_construct_octet_string(
-      OSSL_KDF_PARAM_INFO, "Legacy metadata key verification HMAC key",
-      (size_t)41);
-  *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, "Google Nearby",
-                                           (size_t)13);
-  *p = OSSL_PARAM_construct_end();
-  if (EVP_KDF_derive(kctx, metadata_key_hmac_key, sizeof(metadata_key_hmac_key),
-                     params) <= 0) {
-    printf("HKDF error\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  EVP_KDF_CTX_free(kctx);
-
-  // calculate metadata key hmac using hkdf'd hmac key
-  NpMetadataKeyHmac metadata_key_hmac = {.bytes = {0}};
-  // will be written to by HMAC call, but it will always be
-  // 32 because that's what SHA256 outputs
-  unsigned int md_len = 32;
-  // first 14 bytes of payload are metadata key
-  HMAC(EVP_sha256(), metadata_key_hmac_key, 32, payload, 14,
-       metadata_key_hmac.bytes, &md_len);
-
-  // create a cipher
-  NpLdtEncryptHandle enc_handle = NpLdtEncryptCreate(key_seed);
-  if (enc_handle.handle == 0) {
-    printf("Error: create LDT failed\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  // encrypt with it
-  NP_LDT_RESULT result = NpLdtEncrypt(enc_handle, payload, payload_len, salt);
-  if (result != 0) {
-    printf("Error: encrypt\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  NpLdtDecryptHandle dec_handle = NpLdtDecryptCreate(key_seed, metadata_key_hmac);
-  if (dec_handle.handle == 0) {
-    printf("Error: create LDT failed\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  // decrypt & verify -- we expect mac mismatch since we're using a random mac
-  result = NpLdtDecryptAndVerify(dec_handle, payload, payload_len, salt);
-  if (result != 0) {
-    printf("Error: decryption failed\n");
-    __builtin_trap();
-    return 0;
-  }
-
-  // deallocate the ciphers
-  result = NpLdtEncryptClose(enc_handle);
-  if (result) {
-    printf("Error: close cipher failed\n");
-    __builtin_trap();
-    return result;
-  }
-
-  result = NpLdtDecryptClose(dec_handle);
-  if (result) {
-    printf("Error: close cipher failed\n");
-    __builtin_trap();
-    return result;
-  }
-
-  return 0;  // Values other than 0 and -1 are reserved for future use.
-}

diff --git a/nearby/presence/ldt_np_c_sample/CMakeLists.txt b/nearby/presence/ldt_np_c_sample/CMakeLists.txt
deleted file mode 100644
index aefc0ba..0000000
--- a/nearby/presence/ldt_np_c_sample/CMakeLists.txt
+++ /dev/null

@@ -1,52 +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_directories(
-    ${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi/include/
-    ${CMAKE_SOURCE_DIR}/ldt_np_c_sample/)
-
-include(ExternalProject)
-set_directory_properties(PROPERTIES EP_PREFIX ${CMAKE_BINARY_DIR}/target/tmp)
-ExternalProject_Add(
-    ldt_np_adv_ffi
-    DOWNLOAD_COMMAND ""
-    CONFIGURE_COMMAND ""
-    BUILD_COMMAND cargo build COMMAND cargo build --release --no-default-features --features std
-    BINARY_DIR "${CMAKE_SOURCE_DIR}/ldt_np_adv_ffi"
-    INSTALL_COMMAND "")
-
-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}"
-)
-
-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 "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
deleted file mode 100644
index 141563d..0000000
--- a/nearby/presence/ldt_np_c_sample/tests/CMakeLists.txt
+++ /dev/null

@@ -1,65 +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.
-
-file(COPY ${CMAKE_SOURCE_DIR}/ldt_np_adv/resources/test/np_adv_test_vectors.json
-     DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
-
-add_executable(
-  ldt_ffi_tests
-  ldt_ffi_tests.cc
-)
-
-target_link_libraries(
-  ldt_ffi_tests
-  "${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
-)
-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
-)
-
-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
-)
-
-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_jni/Cargo.toml b/nearby/presence/ldt_np_jni/Cargo.toml
index 2551c14..cf7c2db 100644
--- a/nearby/presence/ldt_np_jni/Cargo.toml
+++ b/nearby/presence/ldt_np_jni/Cargo.toml

@@ -20,7 +20,6 @@
 [features]
 default = ["rustcrypto"]
 rustcrypto = ["crypto_provider_default/rustcrypto", "crypto_provider_default/std"]
-opensslbssl = ["crypto_provider_default/opensslbssl"]
 boringssl = ["crypto_provider_default/boringssl"]
 
 [lib]

diff --git a/nearby/presence/ldt_np_jni/java/LdtNpJni/src/main/java/com/google/android/gms/nearby/presence/hazmat/LdtNpJni.java b/nearby/presence/ldt_np_jni/java/LdtNpJni/src/main/java/com/google/android/gms/nearby/presence/hazmat/LdtNpJni.java
index 6af362a..1c0db30 100644
--- a/nearby/presence/ldt_np_jni/java/LdtNpJni/src/main/java/com/google/android/gms/nearby/presence/hazmat/LdtNpJni.java
+++ b/nearby/presence/ldt_np_jni/java/LdtNpJni/src/main/java/com/google/android/gms/nearby/presence/hazmat/LdtNpJni.java

@@ -17,22 +17,25 @@
 
 import androidx.annotation.IntDef;
 
-
 /** JNI for a Nearby Presence LDT-XTS-AES128 cipher with the "swap" mix function. */
 class LdtNpJni {
 
   /** Error codes which map to return values on the native side. */
-  @IntDef({DecryptErrorCode.DATA_LEN_ERROR, DecryptErrorCode.JNI_OP_ERROR, DecryptErrorCode.MAC_MISMATCH} )
+  @IntDef({
+    DecryptErrorCode.DATA_LEN_ERROR,
+    DecryptErrorCode.JNI_OP_ERROR,
+    DecryptErrorCode.MAC_MISMATCH
+  })
   public @interface DecryptErrorCode {
-    int  DATA_LEN_ERROR = -1;
+    int DATA_LEN_ERROR = -1;
     int JNI_OP_ERROR = -2;
     int MAC_MISMATCH = -3;
   }
 
   /** Error codes which map to return values on the native side. */
-  @IntDef({EncryptErrorCode.DATA_LEN_ERROR, EncryptErrorCode.JNI_OP_ERROR} )
+  @IntDef({EncryptErrorCode.DATA_LEN_ERROR, EncryptErrorCode.JNI_OP_ERROR})
   public @interface EncryptErrorCode {
-    int  DATA_LEN_ERROR = -1;
+    int DATA_LEN_ERROR = -1;
     int JNI_OP_ERROR = -2;
   }
 
@@ -43,8 +46,8 @@
   /**
    * Create a new LDT-XTS-AES128 Encryption cipher using the "swap" mix function.
    *
-   * @param keySeed is the 32-byte key material from the Nearby Presence credential from which
-   *     the LDT key will be derived.
+   * @param keySeed is the 32-byte key material from the Nearby Presence credential from which the
+   *     LDT key will be derived.
    * @return 0 on error, or a non-zero handle on success.
    */
   static native long createEncryptionCipher(byte[] keySeed);
@@ -52,16 +55,17 @@
   /**
    * Create a new LDT-XTS-AES128 Decryption cipher using the "swap" mix function.
    *
-   * @param keySeed is the 32-byte key material from the Nearby Presence credential from which
-   *     the LDT key will be derived.
-   * @param hmacTag is the hmac auth tag calculated on the metadata key used to verify
-   *     decryption was successful.
+   * @param keySeed is the 32-byte key material from the Nearby Presence credential from which the
+   *     LDT key will be derived.
+   * @param hmacTag is the hmac auth tag calculated on the metadata key used to verify decryption
+   *     was successful.
    * @return 0 on error, or a non-zero handle on success.
    */
   static native long createDecryptionCipher(byte[] keySeed, byte[] hmacTag);
 
   /**
    * Close the native resources for an LdtEncryptCipher instance.
+   *
    * @param ldtEncryptHandle a ldt handle returned from {@link LdtNpJni#createEncryptionCipher}.
    */
   static native void closeEncryptCipher(long ldtEncryptHandle);
@@ -76,28 +80,28 @@
   /**
    * Encrypt a 16-31 byte buffer in-place.
    *
-   * @param ldtEncryptHandle a ldt encryption handle returned from {@link LdtNpJni#createEncryptionCipher}.
-   * @param salt is the big-endian 2 byte salt that will be used in the Nearby
-   *     Presence advertisement, which will be incorporated into the tweaks LDT uses
-   *     while encrypting.
+   * @param ldtEncryptHandle a ldt encryption handle returned from {@link
+   *     LdtNpJni#createEncryptionCipher}.
+   * @param salt is the big-endian 2 byte salt that will be used in the Nearby Presence
+   *     advertisement, which will be incorporated into the tweaks LDT uses while encrypting.
    * @param data 16-31 bytes of plaintext data to be encrypted
-   * @return 0 on success, in which case `buffer` will now contain ciphertext or a non-zero
-   *     an error code on failure
+   * @return 0 on success, in which case `buffer` will now contain ciphertext or a non-zero an error
+   *     code on failure
    */
   @EncryptErrorCode
   static native int encrypt(long ldtEncryptHandle, char salt, byte[] data);
 
   /**
-   *  Decrypt a 16-31 byte buffer in-place and verify the plaintext metadata key matches
-   *  this item's MAC, if not the buffer will not be decrypted.
+   * Decrypt a 16-31 byte buffer in-place and verify the plaintext metadata key matches this item's
+   * MAC, if not the buffer will not be decrypted.
    *
-   * @param ldtDecryptHandle  a ldt encryption handle returned from {@link LdtNpJni#createDecryptionCipher}.
-   * @param salt is the big-endian 2 byte salt that will be used in the Nearby
-   *     Presence advertisement, which will be incorporated into the tweaks LDT uses
-   *     while encrypting.
+   * @param ldtDecryptHandle a ldt encryption handle returned from {@link
+   *     LdtNpJni#createDecryptionCipher}.
+   * @param salt is the big-endian 2 byte salt that will be used in the Nearby Presence
+   *     advertisement, which will be incorporated into the tweaks LDT uses while encrypting.
    * @param data 16-31 bytes of ciphertext data to be decrypted
-   * @return 0 on success, in which case `buffer` will now contain ciphertext or a non-zero
-   *     an error code on failure, in which case data will remain unchanged.
+   * @return 0 on success, in which case `buffer` will now contain ciphertext or a non-zero an error
+   *     code on failure, in which case data will remain unchanged.
    */
   @DecryptErrorCode
   static native int decryptAndVerify(long ldtDecryptHandle, char salt, byte[] data);

diff --git a/nearby/presence/np_adv/benches/deser_adv.rs b/nearby/presence/np_adv/benches/deser_adv.rs
index 08fd5c4..b52f53a 100644
--- a/nearby/presence/np_adv/benches/deser_adv.rs
+++ b/nearby/presence/np_adv/benches/deser_adv.rs

@@ -333,7 +333,9 @@
         }
     }
 }
-fn add_des<I: SectionEncoder>(sb: &mut SectionBuilder<I>) {
+fn add_des<I: SectionEncoder>(
+    sb: &mut SectionBuilder<&mut np_adv::extended::serialize::AdvBuilder, 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();
 }

diff --git a/nearby/presence/np_adv/src/credential/v1.rs b/nearby/presence/np_adv/src/credential/v1.rs
index 386799f..c13487d 100644
--- a/nearby/presence/np_adv/src/credential/v1.rs
+++ b/nearby/presence/np_adv/src/credential/v1.rs

@@ -18,6 +18,7 @@
     protocol_version_seal, BroadcastCryptoMaterial, DiscoveryCryptoMaterial, ProtocolVersion,
 };
 use crate::MetadataKey;
+use crypto_provider::ed25519::InvalidPublicKeyBytes;
 use crypto_provider::{aes::Aes128Key, ed25519, ed25519::PublicKey, CryptoProvider, CryptoRng};
 use np_hkdf::UnsignedSectionKeys;
 
@@ -28,22 +29,52 @@
     key_seed: [u8; 32],
     expected_unsigned_metadata_key_hmac: [u8; 32],
     expected_signed_metadata_key_hmac: [u8; 32],
-    pub_key: ed25519::RawPublicKey,
+    validated_pub_key: sealed::ValidatedPublicKey,
 }
+
+mod sealed {
+    use crypto_provider::ed25519::InvalidPublicKeyBytes;
+    use crypto_provider::{ed25519, CryptoProvider};
+
+    // Wrapper of raw public ed25519 key bytes indicating the bytes stored
+    // actually represent a valid "edwards y" format and that said compressed
+    // point is actually a point on the curve.
+    #[derive(Clone, Copy)]
+    pub(crate) struct ValidatedPublicKey(ed25519::RawPublicKey);
+
+    impl ValidatedPublicKey {
+        pub(crate) fn from_raw_bytes<C: CryptoProvider>(
+            bytes: ed25519::RawPublicKey,
+        ) -> Result<Self, InvalidPublicKeyBytes> {
+            np_ed25519::PublicKey::<C>::from_bytes(&bytes)
+                .map(|_| Self(bytes))
+                .map_err(|_| InvalidPublicKeyBytes)
+        }
+
+        pub(crate) fn to_public_key<C: CryptoProvider>(self) -> np_ed25519::PublicKey<C> {
+            np_ed25519::PublicKey::<C>::from_bytes(&self.0)
+                .expect("The public key bytes were validated on construction")
+        }
+    }
+}
+pub(crate) use sealed::ValidatedPublicKey;
+
 impl V1DiscoveryCredential {
     /// Construct a V1 discovery credential from the provided identity data.
-    pub fn new(
+    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: ed25519::RawPublicKey,
-    ) -> Self {
-        Self {
-            key_seed,
-            expected_unsigned_metadata_key_hmac,
-            expected_signed_metadata_key_hmac,
-            pub_key,
-        }
+    ) -> Result<Self, InvalidPublicKeyBytes> {
+        ValidatedPublicKey::from_raw_bytes::<C>(pub_key)
+            .map(|validated_pub_key| Self {
+                key_seed,
+                expected_unsigned_metadata_key_hmac,
+                expected_signed_metadata_key_hmac,
+                validated_pub_key,
+            })
+            .map_err(|_| InvalidPublicKeyBytes)
     }
 
     /// Constructs pre-calculated crypto material from this discovery credential.
@@ -94,7 +125,7 @@
     }
 
     fn signed_verification_material<C: CryptoProvider>(&self) -> SignedSectionVerificationMaterial {
-        SignedSectionVerificationMaterial { pub_key: self.pub_key }
+        SignedSectionVerificationMaterial { validated_public_key: self.validated_pub_key }
     }
 
     fn unsigned_verification_material<C: CryptoProvider>(
@@ -229,7 +260,7 @@
 pub struct SignedSectionVerificationMaterial {
     /// The np_ed25519 public key to be
     /// used for signature verification of signed sections.
-    pub(crate) pub_key: ed25519::RawPublicKey,
+    pub(crate) validated_public_key: sealed::ValidatedPublicKey,
 }
 
 impl SignedSectionVerificationMaterial {
@@ -238,7 +269,7 @@
     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")
+        self.validated_public_key.to_public_key()
     }
 }
 
@@ -408,7 +439,7 @@
             .calculate_hmac(metadata_key.0.as_slice());
         let signed =
             hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(metadata_key.0.as_slice());
-        V1DiscoveryCredential::new(key_seed, unsigned, signed, pub_key)
+        V1DiscoveryCredential::new::<C>(key_seed, unsigned, signed, pub_key).expect("The public key bytes are guaranteed to be valid since they come from the key_pair construction above")
     }
 }
 

diff --git a/nearby/presence/np_adv/src/deser_v1_tests.rs b/nearby/presence/np_adv/src/deser_v1_tests.rs
index cea0063..cdd9030 100644
--- a/nearby/presence/np_adv/src/deser_v1_tests.rs
+++ b/nearby/presence/np_adv/src/deser_v1_tests.rs

@@ -429,7 +429,7 @@
 /// Populate a random number of sections with randomly chosen identities and random DEs
 fn fill_encrypted_adv<'a, R: rand::Rng, C: CryptoProvider>(
     mut rng: &mut R,
-    identities: &'a Vec<TestIdentity<C>>,
+    identities: &'a [TestIdentity<C>],
     adv_builder: &mut AdvBuilder,
 ) -> Vec<SectionConfig<'a, C>> {
     let mut expected = Vec::new();
@@ -519,7 +519,7 @@
 }
 /// Add several DEs with random types and contents
 fn add_des<I: SectionEncoder, R: rand::Rng>(
-    mut sb: SectionBuilder<I>,
+    mut sb: SectionBuilder<&mut AdvBuilder, I>,
     rng: &mut R,
 ) -> Vec<GenericDataElement> {
     let mut des = Vec::new();

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
index af70228..c5a468f 100644
--- 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

@@ -129,12 +129,13 @@
 
     // plaintext is correct
     {
-        let crypto_material = V1DiscoveryCredential::new(
+        let crypto_material = V1DiscoveryCredential::new::<CryptoProviderImpl>(
             key_seed,
             key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key.0),
             key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key.0),
             key_pair.public().to_bytes(),
-        );
+        )
+        .expect("public key bytes are valid since they are generated from a key pair");
         let signed_identity_resolution_material =
             crypto_material.signed_identity_resolution_material::<CryptoProviderImpl>();
         let identity_resolution_contents =
@@ -179,12 +180,13 @@
 
     // deserialization to Section works
     {
-        let crypto_material = V1DiscoveryCredential::new(
+        let crypto_material = V1DiscoveryCredential::new::<CryptoProviderImpl>(
             key_seed,
             key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key.0),
             key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key.0),
             key_pair.public().to_bytes(),
-        );
+        )
+        .expect("public key bytes are valid since they are generated from a key pair");
         let signed_identity_resolution_material =
             crypto_material.signed_identity_resolution_material::<CryptoProviderImpl>();
         let signed_verification_material =
@@ -422,7 +424,10 @@
         });
 
     let signed_verification_material = SignedSectionVerificationMaterial {
-        pub_key: pub_key.unwrap_or_else(|| key_pair.public()).to_bytes(),
+        validated_public_key: ValidatedPublicKey::from_raw_bytes::<CryptoProviderImpl>(
+            pub_key.unwrap_or_else(|| key_pair.public()).to_bytes(),
+        )
+        .expect("public key should be valid bytes"),
     };
 
     assert_eq!(
@@ -526,12 +531,13 @@
         contents
     );
 
-    let crypto_material = V1DiscoveryCredential::new(
+    let crypto_material = V1DiscoveryCredential::new::<CryptoProviderImpl>(
         key_seed,
         key_seed_hkdf.extended_unsigned_metadata_key_hmac_key().calculate_hmac(&metadata_key.0),
         key_seed_hkdf.extended_signed_metadata_key_hmac_key().calculate_hmac(&metadata_key.0),
         key_pair.public().to_bytes(),
-    );
+    )
+    .expect("public key bytes are valid since they are generated from a key pair");
     let identity_resolution_material =
         crypto_material.signed_identity_resolution_material::<CryptoProviderImpl>();
     let verification_material =

diff --git a/nearby/presence/np_adv/src/extended/deserialize/mod.rs b/nearby/presence/np_adv/src/extended/deserialize/mod.rs
index 6ec7881..8f12a94 100644
--- a/nearby/presence/np_adv/src/extended/deserialize/mod.rs
+++ b/nearby/presence/np_adv/src/extended/deserialize/mod.rs

@@ -48,7 +48,7 @@
             DeserializationError, EncryptedSectionContents, MicEncryptedSection,
             MicVerificationError, SignatureEncryptedSection, SignatureVerificationError,
         },
-        DeLength, ENCRYPTION_INFO_DE_TYPE, METADATA_KEY_LEN, NP_ADV_MAX_SECTION_LEN,
+        DeLength, ENCRYPTION_INFO_DE_TYPE, NP_ADV_MAX_SECTION_LEN,
     },
     HasIdentityMatch, MetadataKey, PlaintextIdentityMode, V1Header,
 };
@@ -170,7 +170,7 @@
                         // 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)
+                            (EncryptedIdentityMetadata::TOTAL_DE_LEN..=NP_ADV_MAX_SECTION_LEN)
                                 .contains(&identity_and_ciphertext.len())
                         },
                     ),
@@ -206,7 +206,8 @@
                         // 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)
+                            (EncryptedIdentityMetadata::TOTAL_DE_LEN + SectionMic::CONTENTS_LEN
+                                ..=NP_ADV_MAX_SECTION_LEN)
                                 .contains(&identity_ciphertext_and_mic.len())
                         },
                     ),
@@ -901,6 +902,8 @@
     }
 }
 
+pub(crate) const IDENTITY_HEADER_LEN: usize = 2;
+
 /// Parsed form of an encrypted identity DE before its contents are decrypted.
 /// Metadata key is stored in the enclosing section.
 #[derive(PartialEq, Eq, Debug)]
@@ -908,7 +911,7 @@
     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) header_bytes: [u8; IDENTITY_HEADER_LEN],
     pub(crate) identity_type: EncryptedIdentityDataElementType,
 }
 

diff --git a/nearby/presence/np_adv/src/extended/deserialize/section_tests.rs b/nearby/presence/np_adv/src/extended/deserialize/section_tests.rs
index f7e2025..5fa2dbe 100644
--- a/nearby/presence/np_adv/src/extended/deserialize/section_tests.rs
+++ b/nearby/presence/np_adv/src/extended/deserialize/section_tests.rs

@@ -523,7 +523,7 @@
 fn fill_section_random_des<'adv, R: rand::Rng, I: serialize::SectionEncoder>(
     mut rng: &mut R,
     sink: &'adv mut Vec<u8>,
-    section_builder: &mut SectionBuilder<I>,
+    section_builder: &mut SectionBuilder<&mut AdvBuilder, I>,
     de_offset: usize,
 ) -> (Vec<DataElement<'adv>>, Vec<GenericDataElement>) {
     let mut expected_des = vec![];

diff --git a/nearby/presence/np_adv/src/extended/serialize/mod.rs b/nearby/presence/np_adv/src/extended/serialize/mod.rs
index e753281..b70f49d 100644
--- a/nearby/presence/np_adv/src/extended/serialize/mod.rs
+++ b/nearby/presence/np_adv/src/extended/serialize/mod.rs

@@ -161,6 +161,12 @@
     advertisement_type: AdvertisementType,
 }
 
+impl AsMut<AdvBuilder> for AdvBuilder {
+    fn as_mut(&mut self) -> &mut AdvBuilder {
+        self
+    }
+}
+
 impl AdvBuilder {
     /// Build an [AdvBuilder].
     pub fn new(advertisement_type: AdvertisementType) -> Self {
@@ -170,17 +176,10 @@
         Self { adv, section_count: 0, advertisement_type }
     }
 
-    /// Create a section builder.
-    ///
-    /// 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<SE: SectionEncoder>(
-        &mut self,
-        section_encoder: SE,
-    ) -> Result<SectionBuilder<SE>, AddSectionError> {
+    fn prepare_section_builder_buffer_and_de_offset<SE: SectionEncoder>(
+        &self,
+    ) -> Result<(CapacityLimitedVec<u8, NP_ADV_MAX_SECTION_LEN>, DataElementOffset), AddSectionError>
+    {
         // section header and identity prefix
         let prefix_len = 1 + SE::PREFIX_LEN;
         let minimum_section_len = prefix_len + SE::SUFFIX_LEN;
@@ -203,16 +202,49 @@
         // 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 - SE::SUFFIX_LEN,
-            },
-            section_encoder,
-            adv_builder: self,
-            next_de_offset: SE::INITIAL_DE_OFFSET,
-        })
+        let section = CapacityLimitedVec {
+            vec: section,
+            // won't underflow: checked above
+            capacity: available_len - SE::SUFFIX_LEN,
+        };
+        let next_de_offset = SE::INITIAL_DE_OFFSET;
+        Ok((section, next_de_offset))
+    }
+
+    /// Create a section builder whose contents may be added to this advertisement.
+    ///
+    /// 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<SE: SectionEncoder>(
+        &mut self,
+        section_encoder: SE,
+    ) -> Result<SectionBuilder<&mut AdvBuilder, SE>, AddSectionError> {
+        let (section, next_de_offset) =
+            self.prepare_section_builder_buffer_and_de_offset::<SE>()?;
+
+        Ok(SectionBuilder { section, section_encoder, adv_builder: self, next_de_offset })
+    }
+
+    /// Create a section builder which actually takes ownership of this advertisement builder.
+    ///
+    /// This is unlike `AdvertisementBuilder#section_builder` in that the returned section
+    /// builder will take ownership of this advertisement builder, if the operation was
+    /// successful. Otherwise, this advertisement builder will be returned back to the
+    /// caller unaltered as part of the `Err` arm.
+    #[allow(clippy::result_large_err)]
+    pub fn into_section_builder<SE: SectionEncoder>(
+        self,
+        section_encoder: SE,
+    ) -> Result<SectionBuilder<AdvBuilder, SE>, (AdvBuilder, AddSectionError)> {
+        match self.prepare_section_builder_buffer_and_de_offset::<SE>() {
+            Ok((section, next_de_offset)) => {
+                Ok(SectionBuilder { section, section_encoder, adv_builder: self, next_de_offset })
+            }
+            Err(err) => Err((self, err)),
+        }
     }
 
     /// Convert the builder into an encoded advertisement.
@@ -220,6 +252,12 @@
         EncodedAdvertisement { adv: to_array_view(self.adv) }
     }
 
+    /// Gets the current number of sections added to this advertisement
+    /// builder, not counting any outstanding SectionBuilders.
+    pub fn section_count(&self) -> usize {
+        self.section_count
+    }
+
     /// Add the section, which must have come from a SectionBuilder generated from this, into this
     /// advertisement.
     fn add_section(&mut self, section: EncodedSection) {
@@ -272,6 +310,11 @@
     pub fn as_slice(&self) -> &[u8] {
         self.adv.as_slice()
     }
+    /// Converts this encoded advertisement into
+    /// a raw byte-array.
+    pub fn into_array_view(self) -> ArrayView<u8, BLE_ADV_SVC_CONTENT_LEN> {
+        self.adv
+    }
 }
 
 /// The encoded form of an advertisement section
@@ -279,24 +322,56 @@
 
 /// Accumulates data elements and encodes them into a section.
 #[derive(Debug)]
-pub struct SectionBuilder<'a, SE: SectionEncoder> {
+pub struct SectionBuilder<R: AsMut<AdvBuilder>, SE: SectionEncoder> {
     /// Contains the section header, the identity-specified overhead, and any DEs added
     pub(crate) section: CapacityLimitedVec<u8, NP_ADV_MAX_SECTION_LEN>,
     section_encoder: SE,
-    /// mut ref to enforce only one active section builder at a time
-    adv_builder: &'a mut AdvBuilder,
+    /// mut ref-able to enforce only one active section builder at a time
+    adv_builder: R,
     next_de_offset: DataElementOffset,
 }
 
-impl<'a, SE: SectionEncoder> SectionBuilder<'a, SE> {
+impl<'a, SE: SectionEncoder> SectionBuilder<&'a mut AdvBuilder, SE> {
     /// Add this builder to the advertisement that created it.
     pub fn add_to_advertisement(self) {
-        let adv_builder = self.adv_builder;
+        let _ = self.add_to_advertisement_internal();
+    }
+}
+
+impl<SE: SectionEncoder> SectionBuilder<AdvBuilder, SE> {
+    /// Gets the 0-based index of the section currently under construction
+    /// in the context of the containing advertisement.
+    pub fn section_index(&self) -> usize {
+        self.adv_builder.section_count()
+    }
+    /// Add this builder to the advertisement that created it,
+    /// and returns the containing advertisement back to the caller.
+    pub fn add_to_advertisement(self) -> AdvBuilder {
+        self.add_to_advertisement_internal()
+    }
+}
+
+impl<R: AsMut<AdvBuilder>, SE: SectionEncoder> SectionBuilder<R, SE> {
+    /// Add this builder to the advertisement that created it.
+    /// Returns the mut-refable to the advertisement builder
+    /// which the contents of this section builder were added to.
+    fn add_to_advertisement_internal(mut self) -> R {
+        let adv_builder = self.adv_builder.as_mut();
+        let adv_builder_header_byte = adv_builder.header_byte();
         adv_builder.add_section(Self::build_section(
+            adv_builder_header_byte,
             self.section.into_inner(),
             self.section_encoder,
-            adv_builder,
-        ))
+        ));
+        self.adv_builder
+    }
+
+    /// Gets the derived salt which will be employed for the next DE offset.
+    ///
+    /// Suitable for scenarios (like FFI) where a closure would be inappropriate
+    /// for DE construction, and interaction with the client is preferred.
+    pub fn next_de_salt(&self) -> SE::DerivedSalt {
+        self.section_encoder.de_salt(self.next_de_offset)
     }
 
     /// Add a data element to the section with a closure that returns a `Result`.
@@ -306,8 +381,7 @@
         &mut self,
         build_de: F,
     ) -> Result<(), AddDataElementError<E>> {
-        let writer = build_de(self.section_encoder.de_salt(self.next_de_offset))
-            .map_err(AddDataElementError::BuildDeError)?;
+        let writer = build_de(self.next_de_salt()).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
@@ -357,9 +431,9 @@
     ///
     /// Implemented without self to avoid partial-move issues.
     fn build_section(
+        adv_builder_header_byte: u8,
         mut section_contents: tinyvec::ArrayVec<[u8; NP_ADV_MAX_SECTION_LEN]>,
         mut section_encoder: SE,
-        adv_builder: &AdvBuilder,
     ) -> EncodedSection {
         // there is space because the capacity for DEs was restricted to allow it
         section_contents.resize(section_contents.len() + SE::SUFFIX_LEN, 0);
@@ -372,7 +446,7 @@
             .expect("section length is always <=255 and non-negative");
 
         section_encoder.postprocess(
-            adv_builder.header_byte(),
+            adv_builder_header_byte,
             section_contents[0],
             &mut section_contents[1..],
         );

diff --git a/nearby/presence/np_adv/src/extended/serialize/section_tests.rs b/nearby/presence/np_adv/src/extended/serialize/section_tests.rs
index 68e5b60..3a6a5f9 100644
--- a/nearby/presence/np_adv/src/extended/serialize/section_tests.rs
+++ b/nearby/presence/np_adv/src/extended/serialize/section_tests.rs

@@ -805,7 +805,7 @@
 /// Write `section_contents_len` bytes of DE and header into `section_builder`
 pub(crate) fn fill_section_builder<I: SectionEncoder>(
     section_contents_len: usize,
-    section_builder: &mut SectionBuilder<I>,
+    section_builder: &mut SectionBuilder<&mut AdvBuilder, I>,
 ) {
     // DEs can only go up to 127, so we'll need multiple for long sections
     for _ in 0..(section_contents_len / 100) {
@@ -863,9 +863,14 @@
     fn into_section(self) -> EncodedSection;
 }
 
-impl<'a, I: SectionEncoder> SectionBuilderExt for SectionBuilder<'a, I> {
+impl<R: AsMut<AdvBuilder>, I: SectionEncoder> SectionBuilderExt for SectionBuilder<R, I> {
     /// Convenience method for tests
-    fn into_section(self) -> EncodedSection {
-        Self::build_section(self.section.into_inner(), self.section_encoder, self.adv_builder)
+    fn into_section(mut self) -> EncodedSection {
+        let adv_builder_header_byte = self.adv_builder.as_mut().header_byte();
+        Self::build_section(
+            adv_builder_header_byte,
+            self.section.into_inner(),
+            self.section_encoder,
+        )
     }
 }

diff --git a/nearby/presence/np_adv/src/legacy/actions/macros.rs b/nearby/presence/np_adv/src/legacy/actions/macros.rs
index 8208a57..db241d6 100644
--- a/nearby/presence/np_adv/src/legacy/actions/macros.rs
+++ b/nearby/presence/np_adv/src/legacy/actions/macros.rs

@@ -48,25 +48,6 @@
 /// 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);

diff --git a/nearby/presence/np_adv/src/legacy/actions/mod.rs b/nearby/presence/np_adv/src/legacy/actions/mod.rs
index 90a0186..e0f4514 100644
--- a/nearby/presence/np_adv/src/legacy/actions/mod.rs
+++ b/nearby/presence/np_adv/src/legacy/actions/mod.rs

@@ -439,5 +439,5 @@
 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);
+macros::boolean_element!(Finder, 13, plaintext_and_ciphertext);
+macros::boolean_element!(FastPairSass, 14, plaintext_and_ciphertext);

diff --git a/nearby/presence/np_adv/src/legacy/actions/tests.rs b/nearby/presence/np_adv/src/legacy/actions/tests.rs
index d45d968..6e68211 100644
--- a/nearby/presence/np_adv/src/legacy/actions/tests.rs
+++ b/nearby/presence/np_adv/src/legacy/actions/tests.rs

@@ -250,18 +250,6 @@
 }
 
 #[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 {

diff --git a/nearby/presence/np_adv/src/legacy/random_data_elements.rs b/nearby/presence/np_adv/src/legacy/random_data_elements.rs
index 00a2e93..aca906b 100644
--- a/nearby/presence/np_adv/src/legacy/random_data_elements.rs
+++ b/nearby/presence/np_adv/src/legacy/random_data_elements.rs

@@ -89,9 +89,8 @@
                 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")
-                }
+                ActionType::Finder => bits.set_action(Finder::from(true)),
+                ActionType::FastPairSass => bits.set_action(FastPairSass::from(true)),
             }
         }
 

diff --git a/nearby/presence/np_adv/test.json b/nearby/presence/np_adv/test.json
deleted file mode 100644
index 953eebf..0000000
--- a/nearby/presence/np_adv/test.json
+++ /dev/null

@@ -1,24122 +0,0 @@
-[
-  {
-    "adv_header_byte": "30",
-    "adv_salt": "8CDE04CBC59C9134F37B1FFBCF5C1136",
-    "aes_key": "0C04AAE1338E928EA903CAF2FD806749",
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-        "de_type": 163
-      },
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-      },
-      {
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-        "de_type": 721
-      }
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-    "section_salt": "C807A0FFE7C79ABD61B1862AFBD097AF"
-  },
-  {
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-        "de_type": 859
-      }
-    ],
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-    "section_salt": "A6C0ECE0A9D25663F329C6C218D07CB5"
-  },
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-      },
-      {
-        "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_v1.rs b/nearby/presence/np_adv/tests/examples_v1.rs
index 6e93a3d..f4df30c 100644
--- a/nearby/presence/np_adv/tests/examples_v1.rs
+++ b/nearby/presence/np_adv/tests/examples_v1.rs

@@ -142,12 +142,13 @@
     section_builder.add_to_advertisement();
     let adv = adv_builder.into_advertisement();
 
-    let discovery_credential = V1DiscoveryCredential::new(
+    let discovery_credential = V1DiscoveryCredential::new::<CryptoProviderImpl>(
         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.0),
         key_pair.public().to_bytes(),
-    );
+    )
+    .expect("Public key bytes are valid points on the curve since theyc ame from the keypair");
 
     let credentials: [MatchableCredential<V1, MetadataMatchedCredential<_>>; 1] =
         [MatchableCredential { discovery_credential, match_data: encrypted_sender_metadata }];

diff --git a/nearby/presence/np_adv_dynamic/src/extended.rs b/nearby/presence/np_adv_dynamic/src/extended.rs
index f961bd6..5e1328c 100644
--- a/nearby/presence/np_adv_dynamic/src/extended.rs
+++ b/nearby/presence/np_adv_dynamic/src/extended.rs

@@ -20,11 +20,12 @@
 /// An advertisement builder for V1 advertisements where the
 /// presence/absence of salt is determined at run-time instead of compile-time.
 pub struct BoxedAdvBuilder {
-    adv_builder: AdvBuilder,
+    adv_builder: Box<AdvBuilder>,
 }
 
 impl From<AdvBuilder> for BoxedAdvBuilder {
     fn from(adv_builder: AdvBuilder) -> Self {
+        let adv_builder = Box::new(adv_builder);
         BoxedAdvBuilder { adv_builder }
     }
 }
@@ -48,14 +49,59 @@
     }
 }
 
-fn wrap_section_builder<'a, C: CryptoProvider, S: Into<BoxedSectionBuilder<'a, C>>>(
+fn wrap_owning_section_builder<C: CryptoProvider, S: Into<BoxedSectionBuilder<AdvBuilder, C>>>(
+    maybe_section_builder: Result<S, (AdvBuilder, AddSectionError)>,
+) -> Result<BoxedSectionBuilder<AdvBuilder, C>, (BoxedAdvBuilder, BoxedAddSectionError)> {
+    match maybe_section_builder {
+        Ok(section_builder) => Ok(section_builder.into()),
+        Err((adv_builder, err)) => Err((adv_builder.into(), err.into())),
+    }
+}
+
+fn wrap_mut_ref_section_builder<
+    'a,
+    C: CryptoProvider,
+    S: Into<BoxedSectionBuilder<&'a mut AdvBuilder, C>>,
+>(
     maybe_section_builder: Result<S, AddSectionError>,
-) -> Result<BoxedSectionBuilder<'a, C>, BoxedAddSectionError> {
+) -> Result<BoxedSectionBuilder<&'a mut AdvBuilder, C>, BoxedAddSectionError> {
     let section_builder = maybe_section_builder?;
     Ok(section_builder.into())
 }
 
 impl BoxedAdvBuilder {
+    /// Gets the current count of sections which have been added
+    /// to this advertisement builder. Does not count currently-
+    /// outstanding section builders.
+    pub fn section_count(&self) -> usize {
+        self.adv_builder.section_count()
+    }
+
+    /// Create a section builder using the given identity,
+    /// taking ownership of this advertisement builder.
+    ///
+    /// Unlike `BoxedAdvBuilder#section_builder`, the returned
+    /// section builder will take ownership of this advertisement
+    /// builder, if the operation was successful. Otherwise,
+    /// this advertisement builder will be returned back to the
+    /// caller unaltered as part of the `Err` arm.
+    pub fn into_section_builder<C: CryptoProvider>(
+        self,
+        identity: BoxedIdentity<C>,
+    ) -> Result<BoxedSectionBuilder<AdvBuilder, C>, (Self, BoxedAddSectionError)> {
+        match identity {
+            BoxedIdentity::PublicIdentity => wrap_owning_section_builder(
+                self.adv_builder.into_section_builder(PublicSectionEncoder::default()),
+            ),
+            BoxedIdentity::MicEncrypted(ident) => {
+                wrap_owning_section_builder(self.adv_builder.into_section_builder(ident))
+            }
+            BoxedIdentity::SignedEncrypted(ident) => {
+                wrap_owning_section_builder(self.adv_builder.into_section_builder(ident))
+            }
+        }
+    }
+
     /// Create a section builder using the given identity.
     ///
     /// Returns `Err` if the underlying advertisement builder
@@ -66,16 +112,16 @@
     pub fn section_builder<C: CryptoProvider>(
         &mut self,
         identity: BoxedIdentity<C>,
-    ) -> Result<BoxedSectionBuilder<C>, BoxedAddSectionError> {
+    ) -> Result<BoxedSectionBuilder<&mut AdvBuilder, C>, BoxedAddSectionError> {
         match identity {
-            BoxedIdentity::PublicIdentity => wrap_section_builder(
+            BoxedIdentity::PublicIdentity => wrap_mut_ref_section_builder(
                 self.adv_builder.section_builder(PublicSectionEncoder::default()),
             ),
             BoxedIdentity::MicEncrypted(ident) => {
-                wrap_section_builder(self.adv_builder.section_builder(ident))
+                wrap_mut_ref_section_builder(self.adv_builder.section_builder(ident))
             }
             BoxedIdentity::SignedEncrypted(ident) => {
-                wrap_section_builder(self.adv_builder.section_builder(ident))
+                wrap_mut_ref_section_builder(self.adv_builder.section_builder(ident))
             }
         }
     }
@@ -99,16 +145,49 @@
 /// A `SectionBuilder` whose corresponding Identity
 /// and salted-ness is given at run-time instead of
 /// at compile-time.
-pub enum BoxedSectionBuilder<'a, C: CryptoProvider> {
+pub enum BoxedSectionBuilder<R: AsMut<AdvBuilder>, C: CryptoProvider> {
     /// A builder for a public section.
-    Public(SectionBuilder<'a, PublicSectionEncoder>),
+    Public(Box<SectionBuilder<R, PublicSectionEncoder>>),
     /// A builder for a MIC-verified section.
-    MicEncrypted(SectionBuilder<'a, MicEncryptedSectionEncoder<C>>),
+    MicEncrypted(Box<SectionBuilder<R, MicEncryptedSectionEncoder<C>>>),
     /// A builder for a signature-verified section.
-    SignedEncrypted(SectionBuilder<'a, SignedEncryptedSectionEncoder<C>>),
+    SignedEncrypted(Box<SectionBuilder<R, SignedEncryptedSectionEncoder<C>>>),
 }
 
-impl<'a, C: CryptoProvider> BoxedSectionBuilder<'a, C> {
+impl<C: CryptoProvider> BoxedSectionBuilder<AdvBuilder, C> {
+    /// Gets the 0-based index of the section currently under construction
+    /// in the context of the containing advertisement.
+    pub fn section_index(&self) -> usize {
+        match self {
+            BoxedSectionBuilder::Public(x) => x.section_index(),
+            BoxedSectionBuilder::MicEncrypted(x) => x.section_index(),
+            BoxedSectionBuilder::SignedEncrypted(x) => x.section_index(),
+        }
+    }
+    /// Add this builder to the advertisement that created it,
+    /// returning the containing advertisement builder.
+    pub fn add_to_advertisement(self) -> BoxedAdvBuilder {
+        let adv_builder = match self {
+            BoxedSectionBuilder::Public(x) => x.add_to_advertisement(),
+            BoxedSectionBuilder::MicEncrypted(x) => x.add_to_advertisement(),
+            BoxedSectionBuilder::SignedEncrypted(x) => x.add_to_advertisement(),
+        };
+        BoxedAdvBuilder::from(adv_builder)
+    }
+}
+
+impl<'a, C: CryptoProvider> BoxedSectionBuilder<&'a mut AdvBuilder, C> {
+    /// Add this builder to the advertisement that created it.
+    pub fn add_to_advertisement(self) {
+        match self {
+            BoxedSectionBuilder::Public(x) => x.add_to_advertisement(),
+            BoxedSectionBuilder::MicEncrypted(x) => x.add_to_advertisement(),
+            BoxedSectionBuilder::SignedEncrypted(x) => x.add_to_advertisement(),
+        }
+    }
+}
+
+impl<R: AsMut<AdvBuilder>, C: CryptoProvider> BoxedSectionBuilder<R, C> {
     /// Returns true if this wraps a section builder which
     /// leverages some encrypted identity.
     pub fn is_encrypted(&self) -> bool {
@@ -118,14 +197,20 @@
             BoxedSectionBuilder::SignedEncrypted(_) => true,
         }
     }
-    /// Add this builder to the advertisement that created it.
-    pub fn add_to_advertisement(self) {
+    /// Gets the derived salt of the next DE to be added to the section,
+    /// if this section-builder corresponds to an encrypted section.
+    /// Otherwise, returns nothing.
+    ///
+    /// Suitable for scenarios (like FFI) where a closure would be inappropriate
+    /// for DE construction, and interaction with the client is preferred.
+    pub fn next_de_salt(&self) -> Option<DeSalt<C>> {
         match self {
-            BoxedSectionBuilder::Public(x) => x.add_to_advertisement(),
-            BoxedSectionBuilder::MicEncrypted(x) => x.add_to_advertisement(),
-            BoxedSectionBuilder::SignedEncrypted(x) => x.add_to_advertisement(),
+            BoxedSectionBuilder::Public(_) => None,
+            BoxedSectionBuilder::MicEncrypted(x) => Some(x.next_de_salt()),
+            BoxedSectionBuilder::SignedEncrypted(x) => Some(x.next_de_salt()),
         }
     }
+
     /// 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,
@@ -158,27 +243,27 @@
     }
 }
 
-impl<'a, C: CryptoProvider> From<SectionBuilder<'a, PublicSectionEncoder>>
-    for BoxedSectionBuilder<'a, C>
+impl<R: AsMut<AdvBuilder>, C: CryptoProvider> From<SectionBuilder<R, PublicSectionEncoder>>
+    for BoxedSectionBuilder<R, C>
 {
-    fn from(section_builder: SectionBuilder<'a, PublicSectionEncoder>) -> Self {
-        BoxedSectionBuilder::Public(section_builder)
+    fn from(section_builder: SectionBuilder<R, PublicSectionEncoder>) -> Self {
+        BoxedSectionBuilder::Public(Box::new(section_builder))
     }
 }
 
-impl<'a, C: CryptoProvider> From<SectionBuilder<'a, MicEncryptedSectionEncoder<C>>>
-    for BoxedSectionBuilder<'a, C>
+impl<R: AsMut<AdvBuilder>, C: CryptoProvider> From<SectionBuilder<R, MicEncryptedSectionEncoder<C>>>
+    for BoxedSectionBuilder<R, C>
 {
-    fn from(section_builder: SectionBuilder<'a, MicEncryptedSectionEncoder<C>>) -> Self {
-        BoxedSectionBuilder::MicEncrypted(section_builder)
+    fn from(section_builder: SectionBuilder<R, MicEncryptedSectionEncoder<C>>) -> Self {
+        BoxedSectionBuilder::MicEncrypted(Box::new(section_builder))
     }
 }
 
-impl<'a, C: CryptoProvider> From<SectionBuilder<'a, SignedEncryptedSectionEncoder<C>>>
-    for BoxedSectionBuilder<'a, C>
+impl<R: AsMut<AdvBuilder>, C: CryptoProvider>
+    From<SectionBuilder<R, SignedEncryptedSectionEncoder<C>>> for BoxedSectionBuilder<R, C>
 {
-    fn from(section_builder: SectionBuilder<'a, SignedEncryptedSectionEncoder<C>>) -> Self {
-        BoxedSectionBuilder::SignedEncrypted(section_builder)
+    fn from(section_builder: SectionBuilder<R, SignedEncryptedSectionEncoder<C>>) -> Self {
+        BoxedSectionBuilder::SignedEncrypted(Box::new(section_builder))
     }
 }
 

diff --git a/nearby/presence/np_adv_dynamic/src/legacy.rs b/nearby/presence/np_adv_dynamic/src/legacy.rs
index 191ef75..8ffea16 100644
--- a/nearby/presence/np_adv_dynamic/src/legacy.rs
+++ b/nearby/presence/np_adv_dynamic/src/legacy.rs

@@ -284,6 +284,18 @@
     Ciphertext(ActionBits<Ciphertext>),
 }
 
+impl From<ActionBits<Plaintext>> for BoxedActionBits {
+    fn from(bits: ActionBits<Plaintext>) -> Self {
+        Self::Plaintext(bits)
+    }
+}
+
+impl From<ActionBits<Ciphertext>> for BoxedActionBits {
+    fn from(bits: ActionBits<Ciphertext>) -> Self {
+        Self::Ciphertext(bits)
+    }
+}
+
 /// Error which is raised when the flavor of a [`BoxedActionBits`]
 /// does not match the supported flavors of a [`ToBoxedActionElement`]
 /// upon attempting to add the action to the bit-field.
@@ -300,6 +312,24 @@
         }
     }
 
+    /// Gets the context-sync sequence number from these boxed action bits.
+    pub fn get_context_sync_seq_num(&self) -> ContextSyncSeqNum {
+        match self {
+            BoxedActionBits::Plaintext(x) => x.context_sync_seq_num(),
+            BoxedActionBits::Ciphertext(x) => x.context_sync_seq_num(),
+        }
+    }
+
+    /// Returns whether a boolean action type is set in these action bits, or `None`
+    /// if the given action type does not represent a boolean (e.g: a context-sync
+    /// sequence number).
+    pub fn has_action(&self, action_type: &ActionType) -> Option<bool> {
+        match self {
+            BoxedActionBits::Plaintext(x) => x.has_action(action_type),
+            BoxedActionBits::Ciphertext(x) => x.has_action(action_type),
+        }
+    }
+
     fn set<F: PacketFlavor, E: ToActionElement<F>>(
         action_bits: &mut ActionBits<F>,
         to_element: E,

diff --git a/nearby/presence/np_c_ffi/Cargo.lock b/nearby/presence/np_c_ffi/Cargo.lock
deleted file mode 100644
index 836d35b..0000000
--- a/nearby/presence/np_c_ffi/Cargo.lock
+++ /dev/null

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diff --git a/nearby/presence/np_c_ffi/Cargo.toml b/nearby/presence/np_c_ffi/Cargo.toml
index 86bbd53..991a5e0 100644
--- a/nearby/presence/np_c_ffi/Cargo.toml
+++ b/nearby/presence/np_c_ffi/Cargo.toml

@@ -5,11 +5,11 @@
 publish = false
 
 [dependencies]
-np_ffi_core = { path = "../np_ffi_core" }
-lock_adapter = {path = "../../util/lock_adapter"}
+np_ffi_core.workspace = true
+lock_adapter.workspace = true
 
 [build-dependencies]
-cbindgen = "0.24.5"
+cbindgen.workspace = true
 
 [features]
 default = ["rustcrypto"]
@@ -18,14 +18,4 @@
 
 [lib]
 # boringssl and bssl-sys are built as a static lib, so we need to as well
-crate-type = ["staticlib"]
-
-# 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
\ No newline at end of file
+crate-type = ["staticlib"]
\ No newline at end of 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
index 88483b0..b2967cf 100644
--- a/nearby/presence/np_c_ffi/cbindgen_configs/c_config.toml
+++ b/nearby/presence/np_c_ffi/cbindgen_configs/c_config.toml

@@ -19,7 +19,13 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 */
+
+// clang-format off
 """
+trailer = """
+// clang-format on
+"""
+
 pragma_once = true
 autogen_warning = """
 /*
@@ -44,7 +50,3 @@
 [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
index 5a2ba2a..50de758 100644
--- a/nearby/presence/np_c_ffi/cbindgen_configs/cpp_config.toml
+++ b/nearby/presence/np_c_ffi/cbindgen_configs/cpp_config.toml

@@ -16,7 +16,13 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 */
+
+// clang-format off
 """
+trailer = """
+// clang-format on
+"""
+
 pragma_once = true
 autogen_warning = """
 /*
@@ -38,7 +44,3 @@
 [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/deny.toml b/nearby/presence/np_c_ffi/deny.toml
deleted file mode 100644
index ca51e11..0000000
--- a/nearby/presence/np_c_ffi/deny.toml
+++ /dev/null

@@ -1,213 +0,0 @@
-# This template contains all of the possible sections and their default values
-
-# Note that all fields that take a lint level have these possible values:
-# * deny - An error will be produced and the check will fail
-# * warn - A warning will be produced, but the check will not fail
-# * allow - No warning or error will be produced, though in some cases a note
-# will be
-
-# The values provided in this template are the default values that will be used
-# when any section or field is not specified in your own configuration
-
-# If 1 or more target triples (and optionally, target_features) are specified,
-# only the specified targets will be checked when running `cargo deny check`.
-# This means, if a particular package is only ever used as a target specific
-# dependency, such as, for example, the `nix` crate only being used via the
-# `target_family = "unix"` configuration, that only having windows targets in
-# this list would mean the nix crate, as well as any of its exclusive
-# dependencies not shared by any other crates, would be ignored, as the target
-# list here is effectively saying which targets you are building for.
-targets = [
-    # The triple can be any string, but only the target triples built in to
-    # rustc (as of 1.40) can be checked against actual config expressions
-    #{ triple = "x86_64-unknown-linux-musl" },
-    # You can also specify which target_features you promise are enabled for a
-    # particular target. target_features are currently not validated against
-    # the actual valid features supported by the target architecture.
-    #{ triple = "wasm32-unknown-unknown", features = ["atomics"] },
-]
-
-# This section is considered when running `cargo deny check advisories`
-# More documentation for the advisories section can be found here:
-# https://embarkstudios.github.io/cargo-deny/checks/advisories/cfg.html
-[advisories]
-# The path where the advisory database is cloned/fetched into
-db-path = "~/.cargo/advisory-db"
-# The url(s) of the advisory databases to use
-db-urls = ["https://github.com/rustsec/advisory-db"]
-# The lint level for security vulnerabilities
-vulnerability = "deny"
-# The lint level for unmaintained crates
-unmaintained = "warn"
-# The lint level for crates that have been yanked from their source registry
-yanked = "warn"
-# The lint level for crates with security notices. Note that as of
-# 2019-12-17 there are no security notice advisories in
-# https://github.com/rustsec/advisory-db
-notice = "warn"
-# A list of advisory IDs to ignore. Note that ignored advisories will still
-# output a note when they are encountered.
-ignore = [
-    #"RUSTSEC-0000-0000",
-]
-# Threshold for security vulnerabilities, any vulnerability with a CVSS score
-# lower than the range specified will be ignored. Note that ignored advisories
-# will still output a note when they are encountered.
-# * None - CVSS Score 0.0
-# * Low - CVSS Score 0.1 - 3.9
-# * Medium - CVSS Score 4.0 - 6.9
-# * High - CVSS Score 7.0 - 8.9
-# * Critical - CVSS Score 9.0 - 10.0
-#severity-threshold =
-
-# If this is true, then cargo deny will use the git executable to fetch advisory database.
-# If this is false, then it uses a built-in git library.
-# Setting this to true can be helpful if you have special authentication requirements that cargo-deny does not support.
-# See Git Authentication for more information about setting up git authentication.
-#git-fetch-with-cli = true
-
-# This section is considered when running `cargo deny check licenses`
-# More documentation for the licenses section can be found here:
-# https://embarkstudios.github.io/cargo-deny/checks/licenses/cfg.html
-[licenses]
-# The lint level for crates which do not have a detectable license
-unlicensed = "deny"
-# List of explicitly allowed licenses
-# See https://spdx.org/licenses/ for list of possible licenses
-# [possible values: any SPDX 3.11 short identifier (+ optional exception)].
-allow = [
-    "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
-# [possible values: any SPDX 3.11 short identifier (+ optional exception)].
-deny = [
-    #"Nokia",
-]
-# Lint level for licenses considered copyleft
-copyleft = "warn"
-# Blanket approval or denial for OSI-approved or FSF Free/Libre licenses
-# * both - The license will be approved if it is both OSI-approved *AND* FSF
-# * either - The license will be approved if it is either OSI-approved *OR* FSF
-# * osi-only - The license will be approved if is OSI-approved *AND NOT* FSF
-# * fsf-only - The license will be approved if is FSF *AND NOT* OSI-approved
-# * neither - This predicate is ignored and the default lint level is used
-allow-osi-fsf-free = "neither"
-# Lint level used when no other predicates are matched
-# 1. License isn't in the allow or deny lists
-# 2. License isn't copyleft
-# 3. License isn't OSI/FSF, or allow-osi-fsf-free = "neither"
-default = "deny"
-# The confidence threshold for detecting a license from license text.
-# The higher the value, the more closely the license text must be to the
-# canonical license text of a valid SPDX license file.
-# [possible values: any between 0.0 and 1.0].
-confidence-threshold = 0.8
-# Allow 1 or more licenses on a per-crate basis, so that particular licenses
-# aren't accepted for every possible crate as with the normal allow list
-exceptions = [
-    # Each entry is the crate and version constraint, and its specific allow
-    # list
-    #{ allow = ["Zlib"], name = "adler32", version = "*" },
-]
-
-# Some crates don't have (easily) machine readable licensing information,
-# adding a clarification entry for it allows you to manually specify the
-# licensing information
-#[[licenses.clarify]]
-# The name of the crate the clarification applies to
-#name = "ring"
-# The optional version constraint for the crate
-#version = "*"
-# The SPDX expression for the license requirements of the crate
-#expression = "MIT AND ISC AND OpenSSL"
-# One or more files in the crate's source used as the "source of truth" for
-# the license expression. If the contents match, the clarification will be used
-# when running the license check, otherwise the clarification will be ignored
-# and the crate will be checked normally, which may produce warnings or errors
-# depending on the rest of your configuration
-#license-files = [
-    # Each entry is a crate relative path, and the (opaque) hash of its contents
-    #{ path = "LICENSE", hash = 0xbd0eed23 }
-#]
-
-[[licenses.clarify]]
-name = "ring"
-version = "*"
-expression = "MIT AND ISC AND OpenSSL"
-license-files = [
-    # Each entry is a crate relative path, and the (opaque) hash of its contents
-    { path = "LICENSE", hash = 0xbd0eed23 }
-]
-
-[licenses.private]
-# If true, ignores workspace crates that aren't published, or are only
-# published to private registries.
-# To see how to mark a crate as unpublished (to the official registry),
-# visit https://doc.rust-lang.org/cargo/reference/manifest.html#the-publish-field.
-ignore = true
-# One or more private registries that you might publish crates to, if a crate
-# is only published to private registries, and ignore is true, the crate will
-# not have its license(s) checked
-registries = [
-    #"https://sekretz.com/registry
-]
-
-# This section is considered when running `cargo deny check bans`.
-# More documentation about the 'bans' section can be found here:
-# https://embarkstudios.github.io/cargo-deny/checks/bans/cfg.html
-[bans]
-# Lint level for when multiple versions of the same crate are detected
-multiple-versions = "allow"
-# Lint level for when a crate version requirement is `*`
-wildcards = "allow"
-# The graph highlighting used when creating dotgraphs for crates
-# with multiple versions
-# * lowest-version - The path to the lowest versioned duplicate is highlighted
-# * simplest-path - The path to the version with the fewest edges is highlighted
-# * all - Both lowest-version and simplest-path are used
-highlight = "all"
-# List of crates that are allowed. Use with care!
-allow = [
-    #{ name = "ansi_term", version = "=0.11.0" },
-]
-# List of crates to deny
-deny = [
-    # Each entry the name of a crate and a version range. If version is
-    # not specified, all versions will be matched.
-    #{ name = "ansi_term", version = "=0.11.0" },
-    #
-    # Wrapper crates can optionally be specified to allow the crate when it
-    # is a direct dependency of the otherwise banned crate
-    #{ name = "ansi_term", version = "=0.11.0", wrappers = [] },
-]
-# Certain crates/versions that will be skipped when doing duplicate detection.
-skip = [
-    #{ name = "ansi_term", version = "=0.11.0" },
-]
-# Similarly to `skip` allows you to skip certain crates during duplicate
-# detection. Unlike skip, it also includes the entire tree of transitive
-# dependencies starting at the specified crate, up to a certain depth, which is
-# by default infinite
-skip-tree = [
-    #{ name = "ansi_term", version = "=0.11.0", depth = 20 },
-]
-
-# This section is considered when running `cargo deny check sources`.
-# More documentation about the 'sources' section can be found here:
-# https://embarkstudios.github.io/cargo-deny/checks/sources/cfg.html
-[sources]
-# Lint level for what to happen when a crate from a crate registry that is not
-# in the allow list is encountered
-unknown-registry = "warn"
-# Lint level for what to happen when a crate from a git repository that is not
-# in the allow list is encountered
-unknown-git = "warn"
-# List of URLs for allowed crate registries. Defaults to the crates.io index
-# if not specified. If it is specified but empty, no registries are allowed.
-allow-registry = ["https://github.com/rust-lang/crates.io-index"]
-# List of URLs for allowed Git repositories
-allow-git = []
\ No newline at end of file

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
index 81914c9..0ff152f 100644
--- a/nearby/presence/np_c_ffi/include/c/np_c_ffi.h
+++ b/nearby/presence/np_c_ffi/include/c/np_c_ffi.h

@@ -13,10 +13,12 @@
  limitations under the License.
 */
 
+// clang-format off
+
 
 #pragma once
 
-/* Generated with cbindgen:0.24.5 */
+/* Generated with cbindgen:0.26.0 */
 
 /*
  WARNING: this file is autogenerated by cbindgen. Don't modify this manually.
@@ -33,19 +35,130 @@
 #include <stdlib.h>
 
 /**
- * Result type for trying to add a credential to a credential-slab.
+ * Result type for trying to add a V0 credential to a credential-slab.
  */
-enum np_ffi_AddCredentialToSlabResult {
+enum np_ffi_AddV0CredentialToSlabResult {
   /**
    * We succeeded in adding the credential to the slab.
    */
-  NP_FFI_ADD_CREDENTIAL_TO_SLAB_RESULT_SUCCESS = 0,
+  NP_FFI_ADD_V0_CREDENTIAL_TO_SLAB_RESULT_SUCCESS = 0,
   /**
    * The handle to the slab was actually invalid.
    */
-  NP_FFI_ADD_CREDENTIAL_TO_SLAB_RESULT_INVALID_HANDLE = 1,
+  NP_FFI_ADD_V0_CREDENTIAL_TO_SLAB_RESULT_INVALID_HANDLE = 1,
 };
-typedef uint8_t np_ffi_AddCredentialToSlabResult;
+typedef uint8_t np_ffi_AddV0CredentialToSlabResult;
+
+/**
+ * Result code for the operation of adding a DE to a V0
+ * advertisement builder.
+ */
+enum np_ffi_AddV0DEResult {
+  /**
+   * The DE was successfully added to the advertisement builder
+   * behind the given handle.
+   */
+  NP_FFI_ADD_V0DE_RESULT_SUCCESS = 0,
+  /**
+   * The handle for the advertisement builder was invalid.
+   */
+  NP_FFI_ADD_V0DE_RESULT_INVALID_ADVERTISEMENT_BUILDER_HANDLE = 1,
+  /**
+   * There was not enough available space left in the advertisement
+   * to append the given data element.
+   */
+  NP_FFI_ADD_V0DE_RESULT_INSUFFICIENT_ADVERTISEMENT_SPACE = 2,
+  /**
+   * The passed data element is not broadcastable under the
+   * identity type of the advertisement (public/private).
+   */
+  NP_FFI_ADD_V0DE_RESULT_INVALID_IDENTITY_TYPE_FOR_DATA_ELEMENT = 3,
+};
+typedef uint8_t np_ffi_AddV0DEResult;
+
+/**
+ * Result type for trying to add a V1 credential to a credential-slab.
+ */
+enum np_ffi_AddV1CredentialToSlabResult {
+  /**
+   * We succeeded in adding the credential to the slab.
+   */
+  NP_FFI_ADD_V1_CREDENTIAL_TO_SLAB_RESULT_SUCCESS = 0,
+  /**
+   * The handle to the slab was actually invalid.
+   */
+  NP_FFI_ADD_V1_CREDENTIAL_TO_SLAB_RESULT_INVALID_HANDLE = 1,
+  /**
+   * The provided public key bytes do not actually represent a valid "edwards y" format
+   * or that said compressed point is not actually a point on the curve.
+   */
+  NP_FFI_ADD_V1_CREDENTIAL_TO_SLAB_RESULT_INVALID_PUBLIC_KEY_BYTES = 2,
+};
+typedef uint8_t np_ffi_AddV1CredentialToSlabResult;
+
+/**
+ * Result code for operations adding DEs to a section builder.
+ */
+enum np_ffi_AddV1DEResult {
+  /**
+   * The DE was successfully added to the section builder
+   * behind the given handle.
+   */
+  NP_FFI_ADD_V1DE_RESULT_SUCCESS = 0,
+  /**
+   * The handle for the section builder was invalid.
+   */
+  NP_FFI_ADD_V1DE_RESULT_INVALID_SECTION_HANDLE = 1,
+  /**
+   * There was no more space left in the advertisement
+   * to fit the DE in the containing section.
+   */
+  NP_FFI_ADD_V1DE_RESULT_INSUFFICIENT_SECTION_SPACE = 2,
+  /**
+   * The data element itself had invalid characteristics,
+   * most likely a length above 127.
+   */
+  NP_FFI_ADD_V1DE_RESULT_INVALID_DATA_ELEMENT = 3,
+};
+typedef uint8_t np_ffi_AddV1DEResult;
+
+/**
+ * Result code for [`V1SectionBuilder#add_to_advertisement`].
+ */
+enum np_ffi_AddV1SectionToAdvertisementResult {
+  /**
+   * The section referenced by the given handle
+   * couldn't be added to the containing advertisement,
+   * possibly because the handle is invalid or the section
+   * has already been added to the containing section.
+   */
+  NP_FFI_ADD_V1_SECTION_TO_ADVERTISEMENT_RESULT_ERROR = 0,
+  /**
+   * The section referenced by the given handle
+   * was successfully added to the containing advertisement.
+   * After obtaining this result code, the section
+   * handle will no longer be valid.
+   */
+  NP_FFI_ADD_V1_SECTION_TO_ADVERTISEMENT_RESULT_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_AddV1SectionToAdvertisementResult;
+
+/**
+ * Enum common to V0 and V1 serialization expressing
+ * what kind of advertisement builder (public/encrypted)
+ * is in use.
+ */
+enum np_ffi_AdvertisementBuilderKind {
+  /**
+   * The builder is for a public advertisement.
+   */
+  NP_FFI_ADVERTISEMENT_BUILDER_KIND_PUBLIC = 0,
+  /**
+   * The builder is for an encrypted advertisement.
+   */
+  NP_FFI_ADVERTISEMENT_BUILDER_KIND_ENCRYPTED = 1,
+};
+typedef uint8_t np_ffi_AdvertisementBuilderKind;
 
 /**
  * The possible boolean action types which can be present in an Actions data element
@@ -62,6 +175,40 @@
 typedef uint8_t np_ffi_BooleanActionType;
 
 /**
+ * Discriminant for `BuildContextSyncSeqNumResult`.
+ */
+enum np_ffi_BuildContextSyncSeqNumResultKind {
+  /**
+   * The sequence number was outside the allowed
+   * 0-15 single-nibble range.
+   */
+  NP_FFI_BUILD_CONTEXT_SYNC_SEQ_NUM_RESULT_KIND_OUT_OF_RANGE = 0,
+  /**
+   * The sequence number was in range,
+   * and so a `ContextSyncSeqNum` was constructed.
+   */
+  NP_FFI_BUILD_CONTEXT_SYNC_SEQ_NUM_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_BuildContextSyncSeqNumResultKind;
+
+/**
+ * Discriminant for `BuildTxPowerResult`.
+ */
+enum np_ffi_BuildTxPowerResultKind {
+  /**
+   * The transmission power was outside the
+   * allowed -100dBm to 20dBm range.
+   */
+  NP_FFI_BUILD_TX_POWER_RESULT_KIND_OUT_OF_RANGE = 0,
+  /**
+   * The transmission power was in range,
+   * and so a `TxPower` struct was constructed.
+   */
+  NP_FFI_BUILD_TX_POWER_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_BuildTxPowerResultKind;
+
+/**
  * Discriminant for `CreateCredentialBookResult`
  */
 enum np_ffi_CreateCredentialBookResultKind {
@@ -101,6 +248,76 @@
 typedef uint8_t np_ffi_CreateCredentialSlabResultKind;
 
 /**
+ * Discriminant for `CreateV0AdvertisementBuilderResult`
+ */
+enum np_ffi_CreateV0AdvertisementBuilderResultKind {
+  /**
+   * The attempt to create a new advertisement builder
+   * failed since there are no more available
+   * slots for V0 advertisement builders in their handle-map.
+   */
+  NP_FFI_CREATE_V0_ADVERTISEMENT_BUILDER_RESULT_KIND_NO_SPACE_LEFT = 0,
+  /**
+   * The attempt succeeded. The wrapped advertisement builder
+   * may be obtained via
+   * `CreateV0AdvertisementBuilderResult#into_success`.
+   */
+  NP_FFI_CREATE_V0_ADVERTISEMENT_BUILDER_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_CreateV0AdvertisementBuilderResultKind;
+
+/**
+ * Discriminant for `CreateV1AdvertisementBuilderResult`
+ */
+enum np_ffi_CreateV1AdvertisementBuilderResultKind {
+  /**
+   * The attempt to create a new advertisement builder
+   * failed since there are no more available
+   * slots for V1 advertisement builders in their handle-map.
+   */
+  NP_FFI_CREATE_V1_ADVERTISEMENT_BUILDER_RESULT_KIND_NO_SPACE_LEFT = 0,
+  /**
+   * The attempt succeeded. The wrapped advertisement builder
+   * may be obtained via
+   * `CreateV1AdvertisementBuilderResult#into_success`.
+   */
+  NP_FFI_CREATE_V1_ADVERTISEMENT_BUILDER_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_CreateV1AdvertisementBuilderResultKind;
+
+/**
+ * Discriminant for `CreateV1SectionBuilderResult`
+ */
+enum np_ffi_CreateV1SectionBuilderResultKind {
+  /**
+   * The attempt to create a new section builder succeeded.
+   */
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_KIND_SUCCESS = 0,
+  /**
+   * We're currently in the middle of building a section.
+   */
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_KIND_UNCLOSED_ACTIVE_SECTION = 1,
+  /**
+   * The advertisement builder handle was invalid.
+   */
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_KIND_INVALID_ADVERTISEMENT_BUILDER_HANDLE = 2,
+  /**
+   * We're attempting to build a section with an identity
+   * kind (public/encrypted) which doesn't match the kind
+   * for the entire advertisement.
+   */
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_KIND_IDENTITY_KIND_MISMATCH = 3,
+  /**
+   * There isn't enough space for a new section, either
+   * because the maximum section count has been exceeded
+   * or because the advertisement is almost full, and
+   * the minimum size of a section wouldn't fit.
+   */
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_KIND_NO_SPACE_LEFT = 4,
+};
+typedef uint8_t np_ffi_CreateV1SectionBuilderResultKind;
+
+/**
  * A result-type enum which tells the caller whether/not a deallocation
  * succeeded or failed due to the requested handle not being present.
  */
@@ -116,6 +333,24 @@
 } np_ffi_DeallocateResult;
 
 /**
+ * Discriminant for `DecryptMetadataResult`.
+ */
+enum np_ffi_DecryptMetadataResultKind {
+  /**
+   * The attempt to decrypt the metadata of the associated credential succeeded
+   * The associated payload may be obtained via
+   * `DecryptMetadataResult#into_success`.
+   */
+  NP_FFI_DECRYPT_METADATA_RESULT_KIND_SUCCESS,
+  /**
+   * The attempt to decrypt the metadata failed, either the payload had no matching identity
+   * ie it was a public advertisement OR the decrypt attempt itself was unsuccessful
+   */
+  NP_FFI_DECRYPT_METADATA_RESULT_KIND_ERROR,
+};
+typedef uint8_t np_ffi_DecryptMetadataResultKind;
+
+/**
  * Discriminant for `DeserializeAdvertisementResult`.
  */
 enum np_ffi_DeserializeAdvertisementResultKind {
@@ -191,6 +426,34 @@
 typedef uint8_t np_ffi_DeserializedV1IdentityKind;
 
 /**
+ * The DE type for an encrypted identity
+ */
+enum np_ffi_EncryptedIdentityType {
+  /**
+   * Identity for broadcasts to nearby devices with the same
+   * logged-in-account (for some account).
+   */
+  NP_FFI_ENCRYPTED_IDENTITY_TYPE_PRIVATE = 1,
+  /**
+   * Identity for broadcasts to nearby devices which this
+   * device has declared to trust.
+   */
+  NP_FFI_ENCRYPTED_IDENTITY_TYPE_TRUSTED = 2,
+  /**
+   * Identity for broadcasts to devices which have been provisioned
+   * offline with this device.
+   */
+  NP_FFI_ENCRYPTED_IDENTITY_TYPE_PROVISIONED = 4,
+};
+typedef uint8_t np_ffi_EncryptedIdentityType;
+
+enum np_ffi_GetMetadataBufferPartsResultKind {
+  NP_FFI_GET_METADATA_BUFFER_PARTS_RESULT_KIND_SUCCESS = 0,
+  NP_FFI_GET_METADATA_BUFFER_PARTS_RESULT_KIND_ERROR = 1,
+};
+typedef uint8_t np_ffi_GetMetadataBufferPartsResultKind;
+
+/**
  * Discriminant of `GetV0DEResult`.
  */
 enum np_ffi_GetV0DEResultKind {
@@ -211,6 +474,47 @@
 typedef uint8_t np_ffi_GetV0DEResultKind;
 
 /**
+ * Discriminant for `GetV0IdentityDetailsResult`
+ */
+enum np_ffi_GetV0IdentityDetailsResultKind {
+  /**
+   * The attempt to get the identity details
+   * for the advertisement failed, possibly
+   * due to the advertisement being a public
+   * advertisement, or the underlying
+   * advertisement has already been deallocated.
+   */
+  NP_FFI_GET_V0_IDENTITY_DETAILS_RESULT_KIND_ERROR = 0,
+  /**
+   * The attempt to get the identity details succeeded.
+   * The wrapped identity details may be obtained via
+   * `GetV0IdentityDetailsResult#into_success`.
+   */
+  NP_FFI_GET_V0_IDENTITY_DETAILS_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_GetV0IdentityDetailsResultKind;
+
+/**
+ * Discriminant for `GetV1DE16ByteSaltResult`.
+ */
+enum np_ffi_GetV1DE16ByteSaltResultKind {
+  /**
+   * The attempt to get the derived salt failed, possibly
+   * because the passed DE offset was invalid (==255),
+   * or because there was no salt included for the
+   * referenced advertisement section (i.e: it was
+   * a public advertisement section, or it was deallocated.)
+   */
+  NP_FFI_GET_V1DE16_BYTE_SALT_RESULT_KIND_ERROR = 0,
+  /**
+   * A 16-byte salt for the given DE offset was successfully
+   * derived.
+   */
+  NP_FFI_GET_V1DE16_BYTE_SALT_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_GetV1DE16ByteSaltResultKind;
+
+/**
  * Discriminant for the `GetV1DEResult` enum.
  */
 enum np_ffi_GetV1DEResultKind {
@@ -229,6 +533,27 @@
 typedef uint8_t np_ffi_GetV1DEResultKind;
 
 /**
+ * Discriminant for `GetV1IdentityDetailsResult`
+ */
+enum np_ffi_GetV1IdentityDetailsResultKind {
+  /**
+   * The attempt to get the identity details
+   * for the section failed, possibly
+   * due to the section being a public
+   * section, or the underlying
+   * advertisement has already been deallocated.
+   */
+  NP_FFI_GET_V1_IDENTITY_DETAILS_RESULT_KIND_ERROR = 0,
+  /**
+   * The attempt to get the identity details succeeded.
+   * The wrapped identity details may be obtained via
+   * `GetV1IdentityDetailsResult#into_success`.
+   */
+  NP_FFI_GET_V1_IDENTITY_DETAILS_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_GetV1IdentityDetailsResultKind;
+
+/**
  * Discriminant for `GetV1SectionResult`
  */
 enum np_ffi_GetV1SectionResultKind {
@@ -249,6 +574,24 @@
 typedef uint8_t np_ffi_GetV1SectionResultKind;
 
 /**
+ * Discriminant for `NextV1DE16ByteSaltResult`.
+ */
+enum np_ffi_NextV1DE16ByteSaltResultKind {
+  /**
+   * We couldn't return a 16-byte DE salt, possibly
+   * because the handle to the section builder
+   * was invalid, or possibly because the section
+   * builder was for a public section.
+   */
+  NP_FFI_NEXT_V1DE16_BYTE_SALT_RESULT_KIND_ERROR = 0,
+  /**
+   * A 16-byte DE salt was returned successfully.
+   */
+  NP_FFI_NEXT_V1DE16_BYTE_SALT_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_NextV1DE16ByteSaltResultKind;
+
+/**
  * Structure for categorized reasons for why a NP C FFI call may
  * be panicking.
  */
@@ -268,15 +611,80 @@
    */
   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.
+   * Error returned if the bit representation of a supposedly-Rust-constructed
+   * -and-validated type actually doesn't correspond to the format of the
+   * data structure expected on the Rust side of the boundary, and performing
+   * further operations on the structure would yield unintended behavior.
+   * If this kind of error is being raised, the C code must
+   * be messing with stack-allocated data structures for this library
+   * in an entirely unexpected way.
    */
-  NP_FFI_PANIC_REASON_INVALID_ACTION_BITS = 2,
+  NP_FFI_PANIC_REASON_INVALID_STACK_DATA_STRUCTURE = 2,
 };
 typedef uint8_t np_ffi_PanicReason;
 
 /**
+ * Discriminant for `SerializeV0AdvertisementResult`.
+ */
+enum np_ffi_SerializeV0AdvertisementResultKind {
+  /**
+   * Serializing the advertisement to bytes was successful.
+   */
+  NP_FFI_SERIALIZE_V0_ADVERTISEMENT_RESULT_KIND_SUCCESS = 0,
+  /**
+   * Serializing the advertisement to bytes failed
+   * because the data in the advertisement wasn't
+   * of an appropriate size for LDT encryption
+   * to succeed.
+   */
+  NP_FFI_SERIALIZE_V0_ADVERTISEMENT_RESULT_KIND_LDT_ERROR = 1,
+  /**
+   * The advertisement builder handle was invalid.
+   */
+  NP_FFI_SERIALIZE_V0_ADVERTISEMENT_RESULT_KIND_INVALID_ADVERTISEMENT_BUILDER_HANDLE = 2,
+};
+typedef uint8_t np_ffi_SerializeV0AdvertisementResultKind;
+
+/**
+ * Discriminant for `SerializeV1AdvertisementResult`.
+ */
+enum np_ffi_SerializeV1AdvertisementResultKind {
+  /**
+   * Serializing the advertisement to bytes was successful.
+   */
+  NP_FFI_SERIALIZE_V1_ADVERTISEMENT_RESULT_KIND_SUCCESS = 0,
+  /**
+   * The state of the advertisement builder was invalid
+   * for the builder to be closed for serialization, likely
+   * because there was an unclosed section builder.
+   */
+  NP_FFI_SERIALIZE_V1_ADVERTISEMENT_RESULT_KIND_INVALID_BUILDER_STATE = 1,
+  /**
+   * The advertisement builder handle was invalid.
+   */
+  NP_FFI_SERIALIZE_V1_ADVERTISEMENT_RESULT_KIND_INVALID_ADVERTISEMENT_BUILDER_HANDLE = 2,
+};
+typedef uint8_t np_ffi_SerializeV1AdvertisementResultKind;
+
+/**
+ * Discriminant for `SetV0ActionResult`.
+ */
+enum np_ffi_SetV0ActionResultKind {
+  /**
+   * The attempt to set the action bit failed. The
+   * action bits were yielded back to the caller,
+   * unmodified.
+   */
+  NP_FFI_SET_V0_ACTION_RESULT_KIND_ERROR = 0,
+  /**
+   * The attempt to set the action bit succeeded.
+   * The updated action bits were yielded back to the caller.
+   */
+  NP_FFI_SET_V0_ACTION_RESULT_KIND_SUCCESS = 1,
+};
+typedef uint8_t np_ffi_SetV0ActionResultKind;
+
+/**
  * Discriminant for `V0DataElement`.
  */
 enum np_ffi_V0DataElementKind {
@@ -296,7 +704,24 @@
 typedef uint8_t np_ffi_V0DataElementKind;
 
 /**
- *A `#[repr(C)]` handle to a value of type `super::CredentialBookInternals`.
+ * Information about the verification scheme used
+ * for verifying the integrity of the contents
+ * of a decrypted section.
+ */
+enum np_ffi_V1VerificationMode {
+  /**
+   * Message integrity code verification.
+   */
+  NP_FFI_V1_VERIFICATION_MODE_MIC = 0,
+  /**
+   * Signature verification.
+   */
+  NP_FFI_V1_VERIFICATION_MODE_SIGNATURE = 1,
+};
+typedef uint8_t np_ffi_V1VerificationMode;
+
+/**
+ * A `#[repr(C)]` handle to a value of type `CredentialBookInternals`
  */
 typedef struct {
   uint64_t handle_id;
@@ -321,7 +746,7 @@
 } np_ffi_CreateCredentialBookResult;
 
 /**
- *A `#[repr(C)]` handle to a value of type `super::CredentialSlabInternals`.
+ * A `#[repr(C)]` handle to a value of type `CredentialSlabInternals`
  */
 typedef struct {
   uint64_t handle_id;
@@ -394,7 +819,53 @@
 } np_ffi_V1MatchableCredential;
 
 /**
- *A `#[repr(C)]` handle to a value of type `super::V0PayloadInternals`.
+ * A `#[repr(C)]` handle to a value of type `DecryptedMetadataInternals`
+ */
+typedef struct {
+  uint64_t handle_id;
+} np_ffi_DecryptedMetadata;
+
+/**
+ * The result of decrypting metadata from either a V0Payload or DeserializedV1Section
+ */
+typedef enum {
+  NP_FFI_DECRYPT_METADATA_RESULT_SUCCESS,
+  NP_FFI_DECRYPT_METADATA_RESULT_ERROR,
+} np_ffi_DecryptMetadataResult_Tag;
+
+typedef struct {
+  np_ffi_DecryptMetadataResult_Tag tag;
+  union {
+    struct {
+      np_ffi_DecryptedMetadata success;
+    };
+  };
+} np_ffi_DecryptMetadataResult;
+
+/**
+ * The pointer and length of the decrypted metadata byte buffer
+ */
+typedef struct {
+  const uint8_t *ptr;
+  uintptr_t len;
+} np_ffi_MetadataBufferParts;
+
+typedef enum {
+  NP_FFI_GET_METADATA_BUFFER_PARTS_RESULT_SUCCESS,
+  NP_FFI_GET_METADATA_BUFFER_PARTS_RESULT_ERROR,
+} np_ffi_GetMetadataBufferPartsResult_Tag;
+
+typedef struct {
+  np_ffi_GetMetadataBufferPartsResult_Tag tag;
+  union {
+    struct {
+      np_ffi_MetadataBufferParts success;
+    };
+  };
+} np_ffi_GetMetadataBufferPartsResult;
+
+/**
+ * A `#[repr(C)]` handle to a value of type `V0PayloadInternals`
  */
 typedef struct {
   uint64_t handle_id;
@@ -427,7 +898,7 @@
 } np_ffi_DeserializedV0Advertisement;
 
 /**
- *A `#[repr(C)]` handle to a value of type `super::LegibleV1SectionsInternals`.
+ * A `#[repr(C)]` handle to a value of type `LegibleV1SectionsInternals`
  */
 typedef struct {
   uint64_t handle_id;
@@ -576,6 +1047,49 @@
 } np_ffi_GetV0DEResult;
 
 /**
+ * Information about the identity which matched a
+ * decrypted V0 advertisement.
+ */
+typedef struct {
+  /**
+   * The identity type (private/provisioned/trusted)
+   */
+  np_ffi_EncryptedIdentityType identity_type;
+  /**
+   * The ID of the credential which
+   * matched the deserialized adv
+   */
+  uint32_t cred_id;
+  /**
+   * The 14-byte legacy metadata key
+   */
+  uint8_t metadata_key[14];
+  /**
+   * The 2-byte advertisement salt
+   */
+  uint8_t salt[2];
+} np_ffi_DeserializedV0IdentityDetails;
+
+/**
+ * The result of attempting to get the identity details
+ * for a V0 advertisement via
+ * `DeserializedV0Advertisement#get_identity_details`.
+ */
+typedef enum {
+  NP_FFI_GET_V0_IDENTITY_DETAILS_RESULT_ERROR,
+  NP_FFI_GET_V0_IDENTITY_DETAILS_RESULT_SUCCESS,
+} np_ffi_GetV0IdentityDetailsResult_Tag;
+
+typedef struct {
+  np_ffi_GetV0IdentityDetailsResult_Tag tag;
+  union {
+    struct {
+      np_ffi_DeserializedV0IdentityDetails success;
+    };
+  };
+} np_ffi_GetV0IdentityDetailsResult;
+
+/**
  * Handle to a deserialized V1 section
  */
 typedef struct {
@@ -683,6 +1197,356 @@
 } np_ffi_GetV1DEResult;
 
 /**
+ * Information about the identity which matched
+ * a decrypted V1 section.
+ */
+typedef struct {
+  /**
+   * The identity type (private/provisioned/trusted)
+   */
+  np_ffi_EncryptedIdentityType identity_type;
+  /**
+   * The verification mode (MIC/Signature) which
+   * was used to verify the decrypted adv contents.
+   */
+  np_ffi_V1VerificationMode verification_mode;
+  /**
+   * The ID of the credential which
+   * matched the deserialized section.
+   */
+  uint32_t cred_id;
+  /**
+   * The 16-byte metadata key.
+   */
+  uint8_t metadata_key[16];
+} np_ffi_DeserializedV1IdentityDetails;
+
+/**
+ * The result of attempting to get the identity details
+ * for a V1 advertisement section via
+ * `DeserializedV1Advertisement#get_identity_details`.
+ */
+typedef enum {
+  NP_FFI_GET_V1_IDENTITY_DETAILS_RESULT_ERROR,
+  NP_FFI_GET_V1_IDENTITY_DETAILS_RESULT_SUCCESS,
+} np_ffi_GetV1IdentityDetailsResult_Tag;
+
+typedef struct {
+  np_ffi_GetV1IdentityDetailsResult_Tag tag;
+  union {
+    struct {
+      np_ffi_DeserializedV1IdentityDetails success;
+    };
+  };
+} np_ffi_GetV1IdentityDetailsResult;
+
+/**
+ * A FFI safe wrapper of a fixed size array
+ */
+typedef struct {
+  uint8_t _0[16];
+} np_ffi_FixedSizeArray_16;
+
+/**
+ * The result of attempting to get a derived 16-byte salt
+ * for a given DE within a section.
+ */
+typedef enum {
+  NP_FFI_GET_V1DE16_BYTE_SALT_RESULT_ERROR,
+  NP_FFI_GET_V1DE16_BYTE_SALT_RESULT_SUCCESS,
+} np_ffi_GetV1DE16ByteSaltResult_Tag;
+
+typedef struct {
+  np_ffi_GetV1DE16ByteSaltResult_Tag tag;
+  union {
+    struct {
+      np_ffi_FixedSizeArray_16 success;
+    };
+  };
+} np_ffi_GetV1DE16ByteSaltResult;
+
+/**
+ * A `#[repr(C)]` handle to a value of type `V0AdvertisementBuilderInternals`
+ */
+typedef struct {
+  uint64_t handle_id;
+} np_ffi_V0AdvertisementBuilderHandle;
+
+/**
+ * A handle to a builder for V0 advertisements.
+ */
+typedef struct {
+  np_ffi_AdvertisementBuilderKind kind;
+  np_ffi_V0AdvertisementBuilderHandle handle;
+} np_ffi_V0AdvertisementBuilder;
+
+/**
+ * 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[24];
+} np_ffi_ByteBuffer_24;
+
+/**
+ * The result of attempting to serialize the contents
+ * of a V0 advertisement builder to raw bytes.
+ */
+typedef enum {
+  NP_FFI_SERIALIZE_V0_ADVERTISEMENT_RESULT_SUCCESS,
+  NP_FFI_SERIALIZE_V0_ADVERTISEMENT_RESULT_LDT_ERROR,
+  NP_FFI_SERIALIZE_V0_ADVERTISEMENT_RESULT_INVALID_ADVERTISEMENT_BUILDER_HANDLE,
+} np_ffi_SerializeV0AdvertisementResult_Tag;
+
+typedef struct {
+  np_ffi_SerializeV0AdvertisementResult_Tag tag;
+  union {
+    struct {
+      np_ffi_ByteBuffer_24 success;
+    };
+  };
+} np_ffi_SerializeV0AdvertisementResult;
+
+/**
+ * The result of attempting to create a new V0 advertisement builder.
+ */
+typedef enum {
+  NP_FFI_CREATE_V0_ADVERTISEMENT_BUILDER_RESULT_NO_SPACE_LEFT,
+  NP_FFI_CREATE_V0_ADVERTISEMENT_BUILDER_RESULT_SUCCESS,
+} np_ffi_CreateV0AdvertisementBuilderResult_Tag;
+
+typedef struct {
+  np_ffi_CreateV0AdvertisementBuilderResult_Tag tag;
+  union {
+    struct {
+      np_ffi_V0AdvertisementBuilder success;
+    };
+  };
+} np_ffi_CreateV0AdvertisementBuilderResult;
+
+/**
+ * Cryptographic information about a particular V0 broadcast credential
+ * necessary to LDT-encrypt V0 advertisements.
+ */
+typedef struct {
+  uint8_t key_seed[32];
+  uint8_t metadata_key[14];
+} np_ffi_V0BroadcastCredential;
+
+/**
+ * A FFI safe wrapper of a fixed size array
+ */
+typedef struct {
+  uint8_t _0[2];
+} np_ffi_FixedSizeArray_2;
+
+/**
+ * A `#[repr(C)]` handle to a value of type `V1AdvertisementBuilderInternals`
+ */
+typedef struct {
+  uint64_t handle_id;
+} np_ffi_V1AdvertisementBuilderHandle;
+
+/**
+ * A handle to a builder for V1 advertisements.
+ */
+typedef struct {
+  np_ffi_AdvertisementBuilderKind kind;
+  np_ffi_V1AdvertisementBuilderHandle handle;
+} np_ffi_V1AdvertisementBuilder;
+
+/**
+ * A handle to a builder for V1 sections.
+ */
+typedef struct {
+  np_ffi_V1AdvertisementBuilder adv_builder;
+  uint8_t section_index;
+} np_ffi_V1SectionBuilder;
+
+/**
+ * The result of attempting to create a new V1 section builder.
+ */
+typedef enum {
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_SUCCESS,
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_UNCLOSED_ACTIVE_SECTION,
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_INVALID_ADVERTISEMENT_BUILDER_HANDLE,
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_IDENTITY_KIND_MISMATCH,
+  NP_FFI_CREATE_V1_SECTION_BUILDER_RESULT_NO_SPACE_LEFT,
+} np_ffi_CreateV1SectionBuilderResult_Tag;
+
+typedef struct {
+  np_ffi_CreateV1SectionBuilderResult_Tag tag;
+  union {
+    struct {
+      np_ffi_V1SectionBuilder success;
+    };
+  };
+} np_ffi_CreateV1SectionBuilderResult;
+
+/**
+ * Cryptographic information about a particular V1 broadcast credential
+ * necessary to encrypt V1 MIC-verified and signature-verified sections.
+ */
+typedef struct {
+  uint8_t key_seed[32];
+  uint8_t metadata_key[16];
+  uint8_t private_key[32];
+} np_ffi_V1BroadcastCredential;
+
+/**
+ * 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[250];
+} np_ffi_ByteBuffer_250;
+
+/**
+ * The result of attempting to serialize the contents
+ * of a V1 advertisement builder to raw bytes.
+ */
+typedef enum {
+  NP_FFI_SERIALIZE_V1_ADVERTISEMENT_RESULT_SUCCESS,
+  NP_FFI_SERIALIZE_V1_ADVERTISEMENT_RESULT_INVALID_BUILDER_STATE,
+  NP_FFI_SERIALIZE_V1_ADVERTISEMENT_RESULT_INVALID_ADVERTISEMENT_BUILDER_HANDLE,
+} np_ffi_SerializeV1AdvertisementResult_Tag;
+
+typedef struct {
+  np_ffi_SerializeV1AdvertisementResult_Tag tag;
+  union {
+    struct {
+      np_ffi_ByteBuffer_250 success;
+    };
+  };
+} np_ffi_SerializeV1AdvertisementResult;
+
+/**
+ * The result of attempting to create a new V1 advertisement builder.
+ */
+typedef enum {
+  NP_FFI_CREATE_V1_ADVERTISEMENT_BUILDER_RESULT_NO_SPACE_LEFT,
+  NP_FFI_CREATE_V1_ADVERTISEMENT_BUILDER_RESULT_SUCCESS,
+} np_ffi_CreateV1AdvertisementBuilderResult_Tag;
+
+typedef struct {
+  np_ffi_CreateV1AdvertisementBuilderResult_Tag tag;
+  union {
+    struct {
+      np_ffi_V1AdvertisementBuilder success;
+    };
+  };
+} np_ffi_CreateV1AdvertisementBuilderResult;
+
+/**
+ * The result of attempting to get the derived V1 DE
+ * 16-byte salt for the next-added DE to the section
+ * builder behind the given handle.
+ */
+typedef enum {
+  NP_FFI_NEXT_V1DE16_BYTE_SALT_RESULT_ERROR,
+  NP_FFI_NEXT_V1DE16_BYTE_SALT_RESULT_SUCCESS,
+} np_ffi_NextV1DE16ByteSaltResult_Tag;
+
+typedef struct {
+  np_ffi_NextV1DE16ByteSaltResult_Tag tag;
+  union {
+    struct {
+      np_ffi_FixedSizeArray_16 success;
+    };
+  };
+} np_ffi_NextV1DE16ByteSaltResult;
+
+/**
+ * Represents the contents of a V1 DE whose payload
+ * is stored in a buffer which may contain up to 127 bytes,
+ * which is the maximum for any V1 DE.
+ *
+ * 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.
+   */
+  uint32_t de_type;
+  /**
+   * The raw data-element byte payload, up to
+   * 127 bytes in length.
+   */
+  np_ffi_ByteBuffer_127 payload;
+} np_ffi_V1DE127ByteBuffer;
+
+/**
+ * Result type for attempting to construct a
+ * Tx Power from a signed byte.
+ */
+typedef enum {
+  NP_FFI_BUILD_TX_POWER_RESULT_OUT_OF_RANGE,
+  NP_FFI_BUILD_TX_POWER_RESULT_SUCCESS,
+} np_ffi_BuildTxPowerResult_Tag;
+
+typedef struct {
+  np_ffi_BuildTxPowerResult_Tag tag;
+  union {
+    struct {
+      np_ffi_TxPower success;
+    };
+  };
+} np_ffi_BuildTxPowerResult;
+
+/**
+ * The result of attempting to set a particular action
+ * bit on some `V0Actions`.
+ */
+typedef enum {
+  NP_FFI_SET_V0_ACTION_RESULT_SUCCESS,
+  NP_FFI_SET_V0_ACTION_RESULT_ERROR,
+} np_ffi_SetV0ActionResult_Tag;
+
+typedef struct {
+  np_ffi_SetV0ActionResult_Tag tag;
+  union {
+    struct {
+      np_ffi_V0Actions success;
+    };
+    struct {
+      np_ffi_V0Actions error;
+    };
+  };
+} np_ffi_SetV0ActionResult;
+
+/**
+ * Representation of a context-sync sequence number.
+ */
+typedef struct {
+  uint8_t value;
+} np_ffi_ContextSyncSeqNum;
+
+/**
+ * Result type for attempting to construct a
+ * ContextSyncSeqNum from an unsigned byte.
+ */
+typedef enum {
+  NP_FFI_BUILD_CONTEXT_SYNC_SEQ_NUM_RESULT_OUT_OF_RANGE,
+  NP_FFI_BUILD_CONTEXT_SYNC_SEQ_NUM_RESULT_SUCCESS,
+} np_ffi_BuildContextSyncSeqNumResult_Tag;
+
+typedef struct {
+  np_ffi_BuildContextSyncSeqNumResult_Tag tag;
+  union {
+    struct {
+      np_ffi_ContextSyncSeqNum success;
+    };
+  };
+} np_ffi_BuildContextSyncSeqNumResult;
+
+/**
  * 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`
@@ -789,6 +1653,40 @@
 void np_ffi_global_config_set_max_num_deserialized_v1_advertisements(uint32_t max_num_deserialized_v1_advertisements);
 
 /**
+ * Sets the maximum number of active handles to v0 advertisement
+ * builders 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 V0 advertisement builder.
+ */
+void np_ffi_global_config_set_max_num_v0_advertisement_builders(uint32_t max_num_v0_advertisement_builders);
+
+/**
+ * Sets the maximum number of active handles to v1 advertisement
+ * builders 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 V1 advertisement builder.
+ */
+void np_ffi_global_config_set_max_num_v1_advertisement_builders(uint32_t max_num_v1_advertisement_builders);
+
+/**
  * Allocates a new credential-book from the given slab, returning a handle
  * to the created object. The slab will be deallocated by this call.
  */
@@ -839,8 +1737,8 @@
  * which contains the correct len amount of bytes. The copy from the memory address isn't atomic,
  * so concurrent modification of the array from another thread would cause undefined behavior.
  */
-np_ffi_AddCredentialToSlabResult np_ffi_CredentialSlab_add_v0_credential(np_ffi_CredentialSlab credential_slab,
-                                                                         np_ffi_V0MatchableCredential v0_cred);
+np_ffi_AddV0CredentialToSlabResult np_ffi_CredentialSlab_add_v0_credential(np_ffi_CredentialSlab credential_slab,
+                                                                           np_ffi_V0MatchableCredential v0_cred);
 
 /**
  * Adds the given V1 discovery credential with some associated
@@ -850,8 +1748,44 @@
  * which contains the correct len amount of bytes. The copy from the memory address isn't atomic,
  * so concurrent modification of the array from another thread would cause undefined behavior.
  */
-np_ffi_AddCredentialToSlabResult np_ffi_CredentialSlab_add_v1_credential(np_ffi_CredentialSlab credential_slab,
-                                                                         np_ffi_V1MatchableCredential v1_cred);
+np_ffi_AddV1CredentialToSlabResult np_ffi_CredentialSlab_add_v1_credential(np_ffi_CredentialSlab credential_slab,
+                                                                           np_ffi_V1MatchableCredential v1_cred);
+
+/**
+ * Frees the underlying resources of the decrypted metadata buffer
+ */
+np_ffi_DeallocateResult np_ffi_deallocate_DecryptedMetadata(np_ffi_DecryptedMetadata metadata);
+
+/**
+ * Gets the tag of a `DecryptMetadataResult` tagged-union. On success the wrapped identity
+ * details may be obtained via `DecryptMetadataResult#into_success`.
+ */
+np_ffi_DecryptMetadataResultKind np_ffi_DecryptMetadataResult_kind(np_ffi_DecryptMetadataResult result);
+
+/**
+ * Casts a `DecryptMetadataResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_DecryptedMetadata np_ffi_DecryptMetadataResult_into_SUCCESS(np_ffi_DecryptMetadataResult result);
+
+/**
+ * Gets the pointer and length of the heap allocated byte buffer of decrypted metadata
+ */
+np_ffi_GetMetadataBufferPartsResult np_ffi_DecryptedMetadata_get_metadata_buffer_parts(np_ffi_DecryptedMetadata metadata);
+
+/**
+ * Gets the tag of a `GetMetadataBufferPartsResult` tagged-union. On success the wrapped identity
+ * details may be obtained via `GetMetadataBufferPartsResult#into_success`.
+ */
+np_ffi_GetMetadataBufferPartsResultKind np_ffi_GetMetadataBufferPartsResult_kind(np_ffi_GetMetadataBufferPartsResult result);
+
+/**
+ * Casts a `GetMetadataBufferPartsResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant. This returns the pointer and length
+ * of the byte buffer containing the decrypted metadata.  There can be a data-race between attempts
+ * to access the contents of the buffer and attempts to free the handle from different threads.
+ */
+np_ffi_MetadataBufferParts np_ffi_GetMetadataBufferPartsResult_into_SUCCESS(np_ffi_GetMetadataBufferPartsResult result);
 
 /**
  * Attempts to deserialize an advertisement with the given service-data
@@ -933,6 +1867,29 @@
 np_ffi_GetV0DEResult np_ffi_V0Payload_get_de(np_ffi_V0Payload payload, uint8_t index);
 
 /**
+ * Attempts to decrypt the metadata for the matched credential for this V0 payload (if any)
+ */
+np_ffi_DecryptMetadataResult np_ffi_V0Payload_decrypt_metadata(np_ffi_V0Payload payload);
+
+/**
+ * Gets the identity details for this V0 payload, or returns an error if this payload does not have
+ * any associated identity (public advertisement)
+ */
+np_ffi_GetV0IdentityDetailsResult np_ffi_V0Payload_get_identity_details(np_ffi_V0Payload payload);
+
+/**
+ * Gets the tag of a `GetV0IdentityDetailsResult` tagged-union. On success the wrapped identity
+ * details may be obtained via `GetV0IdentityDetailsResult#into_success`.
+ */
+np_ffi_GetV0IdentityDetailsResultKind np_ffi_GetV0IdentityDetailsResult_kind(np_ffi_GetV0IdentityDetailsResult result);
+
+/**
+ * Casts a `GetV0IdentityDetailsResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_DeserializedV0IdentityDetails np_ffi_GetV0IdentityDetailsResult_into_SUCCESS(np_ffi_GetV0IdentityDetailsResult result);
+
+/**
  * Deallocates any internal data of a `V0Payload`
  */
 np_ffi_DeallocateResult np_ffi_deallocate_v0_payload(np_ffi_V0Payload payload);
@@ -949,38 +1906,6 @@
 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`.
@@ -1029,17 +1954,362 @@
                                                          uint8_t de_index);
 
 /**
+ * Gets the identity details used to decrypt this V1 section, or returns an error if this payload
+ * does not have any associated identity (public advertisement)
+ */
+np_ffi_GetV1IdentityDetailsResult np_ffi_DeserializedV1Section_get_identity_details(np_ffi_DeserializedV1Section section);
+
+/**
+ * Gets the tag of a `GetV1IdentityDetailsResult` tagged-union. On success the wrapped identity
+ * details may be obtained via `GetV0IdentityDetailsResult#into_success`.
+ */
+np_ffi_GetV1IdentityDetailsResultKind np_ffi_GetV1IdentityDetailsResult_kind(np_ffi_GetV1IdentityDetailsResult result);
+
+/**
+ * Casts a `GetV1IdentityDetailsResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_DeserializedV1IdentityDetails np_ffi_GetV1IdentityDetailsResult_into_SUCCESS(np_ffi_GetV1IdentityDetailsResult result);
+
+/**
+ * Attempts to decrypt the metadata for the matched credential for this V0 payload (if any)
+ */
+np_ffi_DecryptMetadataResult np_ffi_DeserializedV1Section_decrypt_metadata(np_ffi_DeserializedV1Section section);
+
+/**
+ * Attempts to derive a 16-byte DE salt for a DE in this section with the given DE offset. This
+ * operation may fail if the passed offset is 255 (causes overflow) or if the section
+ * is leveraging a public identity, and hence, doesn't have an associated salt.
+ */
+np_ffi_GetV1DE16ByteSaltResult np_ffi_DeserializedV1Section_derive_16_byte_salt_for_offset(np_ffi_DeserializedV1Section section,
+                                                                                           uint8_t offset);
+
+/**
+ * Gets the tag of a `GetV1DE16ByteSaltResult` tagged-union. On success the wrapped identity
+ * details may be obtained via `GetV1DE16ByteSaltResult#into_success`.
+ */
+np_ffi_GetV1DE16ByteSaltResultKind np_ffi_GetV1DE16ByteSaltResult_kind(np_ffi_GetV1DE16ByteSaltResult result);
+
+/**
+ * Casts a `GetV1DE16ByteSaltResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_FixedSizeArray_16 np_ffi_GetV1DE16ByteSaltResult_into_SUCCESS(np_ffi_GetV1DE16ByteSaltResult result);
+
+/**
  * 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
+ * Casts a `GetV1DEResult` to the `Success` variant, 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);
 
 /**
+ * Attempts to add the given data element to the V0
+ * advertisement builder behind the passed handle.
+ *
+ * This method may invoke the panic handler if the passed DE
+ * has an invalid layout, which may indicate that the backing
+ * data on the stack was somehow tampered with in an unintended way.
+ */
+np_ffi_AddV0DEResult np_ffi_V0AdvertisementBuilder_add_de(np_ffi_V0AdvertisementBuilder adv_builder,
+                                                          np_ffi_V0DataElement de);
+
+/**
+ * Attempts to serialize the contents of the advertisement builder
+ * behind this handle to bytes. Assuming that the handle is valid,
+ * this operation will always result in the contents behind the
+ * advertisement builder handle being deallocated.
+ */
+np_ffi_SerializeV0AdvertisementResult np_ffi_V0AdvertisementBuilder_into_advertisement(np_ffi_V0AdvertisementBuilder adv_builder);
+
+/**
+ * Attempts to deallocate the v0 advertisement builder behind
+ * the given handle.
+ */
+np_ffi_DeallocateResult np_ffi_deallocate_v0_advertisement_builder(np_ffi_V0AdvertisementBuilder adv_builder);
+
+/**
+ * Gets the tag of a `CreateV0AdvertisementBuilderResult` tagged-union.
+ */
+np_ffi_CreateV0AdvertisementBuilderResultKind np_ffi_CreateV0AdvertisementBuilderResult_kind(np_ffi_CreateV0AdvertisementBuilderResult result);
+
+/**
+ * Casts a `CreateV0AdvertisementBuilderResult` to the `Success` variant,
+ * panicking in the case where the passed value is of a different enum variant.
+ */
+np_ffi_V0AdvertisementBuilder np_ffi_CreateV0AdvertisementBuilderResult_into_SUCCESS(np_ffi_CreateV0AdvertisementBuilderResult result);
+
+/**
+ * Creates a new V0 advertisement builder for a public advertisement.
+ */
+np_ffi_CreateV0AdvertisementBuilderResult np_ffi_create_v0_public_advertisement_builder(void);
+
+/**
+ * Creates a new V0 advertisement builder for an encrypted advertisement.
+ */
+np_ffi_CreateV0AdvertisementBuilderResult np_ffi_create_v0_encrypted_advertisement_builder(np_ffi_V0BroadcastCredential broadcast_cred,
+                                                                                           np_ffi_EncryptedIdentityType identity_type,
+                                                                                           np_ffi_FixedSizeArray_2 salt);
+
+/**
+ * Gets the tag of a `SerializeV0AdvertisementResult` tagged-union.
+ */
+np_ffi_SerializeV0AdvertisementResultKind np_ffi_SerializeV0AdvertisementResult_kind(np_ffi_SerializeV0AdvertisementResult result);
+
+/**
+ * Casts a `SerializeV0AdvertisementResult` to the `Success` variant,
+ * panicking in the case where the passed value is of a different enum variant.
+ */
+np_ffi_ByteBuffer_24 np_ffi_SerializeV0AdvertisementResult_into_SUCCESS(np_ffi_SerializeV0AdvertisementResult result);
+
+/**
+ * Attempts to create a builder for a new public section within
+ * the advertisement builder behind this handle,
+ * returning a handle to the newly-created section builder if successful.
+ *
+ * This method may fail if there is another currently-active
+ * section builder for the same advertisement builder, if the
+ * kind of section being added does not match the advertisement
+ * type (public/encrypted), or if the section would not manage
+ * to fit within the enclosing advertisement.
+ */
+np_ffi_CreateV1SectionBuilderResult np_ffi_V1AdvertisementBuilder_public_section_builder(np_ffi_V1AdvertisementBuilder adv_builder);
+
+/**
+ * Attempts to create a builder for a new encrypted section within
+ * the advertisement builder behind the given handle,
+ * returning a handle to the newly-created section builder if successful.
+ *
+ * The identity details for the new section builder may be specified
+ * via providing the broadcast credential data, the kind of encrypted
+ * identity being broadcast (private/trusted/provisioned), and the
+ * verification mode (MIC/Signature) to be used for the encrypted section.
+ *
+ * This method may fail if there is another currently-active
+ * section builder for the same advertisement builder, if the
+ * kind of section being added does not match the advertisement
+ * type (public/encrypted), or if the section would not manage
+ * to fit within the enclosing advertisement.
+ */
+np_ffi_CreateV1SectionBuilderResult np_ffi_V1AdvertisementBuilder_encrypted_section_builder(np_ffi_V1AdvertisementBuilder adv_builder,
+                                                                                            np_ffi_V1BroadcastCredential broadcast_cred,
+                                                                                            np_ffi_EncryptedIdentityType identity_type,
+                                                                                            np_ffi_V1VerificationMode verification_mode);
+
+/**
+ * Attempts to serialize the contents of the advertisement builder
+ * behind this handle to bytes. Assuming that the handle is valid,
+ * this operation will always result in the contents behind the
+ * advertisement builder handle being deallocated.
+ */
+np_ffi_SerializeV1AdvertisementResult np_ffi_V1AdvertisementBuilder_into_advertisement(np_ffi_V1AdvertisementBuilder adv_builder);
+
+/**
+ * Gets the tag of a `CreateV1AdvertisementBuilderResult` tagged-union.
+ */
+np_ffi_CreateV1AdvertisementBuilderResultKind np_ffi_CreateV1AdvertisementBuilderResult_kind(np_ffi_CreateV1AdvertisementBuilderResult result);
+
+/**
+ * Casts a `CreateV1AdvertisementBuilderResult` to the `Success` variant,
+ * panicking in the case where the passed value is of a different enum variant.
+ */
+np_ffi_V1AdvertisementBuilder np_ffi_CreateV1AdvertisementBuilderResult_into_SUCCESS(np_ffi_CreateV1AdvertisementBuilderResult result);
+
+/**
+ * Creates a new V1 advertisement builder for the given advertisement
+ * kind (public/encrypted).
+ */
+np_ffi_CreateV1AdvertisementBuilderResult np_ffi_create_v1_advertisement_builder(np_ffi_AdvertisementBuilderKind kind);
+
+/**
+ * Gets the tag of a `SerializeV1AdvertisementResult` tagged-union.
+ */
+np_ffi_SerializeV1AdvertisementResultKind np_ffi_SerializeV1AdvertisementResult_kind(np_ffi_SerializeV1AdvertisementResult result);
+
+/**
+ * Casts a `SerializeV1AdvertisementResult` to the `Success` variant,
+ * panicking in the case where the passed value is of a different enum variant.
+ */
+np_ffi_ByteBuffer_250 np_ffi_SerializeV1AdvertisementResult_into_SUCCESS(np_ffi_SerializeV1AdvertisementResult result);
+
+/**
+ * Gets the tag of a `CreateV1SectionBuilderResult` tagged-union.
+ */
+np_ffi_CreateV1SectionBuilderResultKind np_ffi_CreateV1SectionBuilderResult_kind(np_ffi_CreateV1SectionBuilderResult result);
+
+/**
+ * Casts a `CreateV1SectionBuilderResult` to the `Success` variant,
+ * panicking in the case where the passed value is of a different enum variant.
+ */
+np_ffi_V1SectionBuilder np_ffi_CreateV1SectionBuilderResult_into_SUCCESS(np_ffi_CreateV1SectionBuilderResult result);
+
+/**
+ * Gets the tag of a `NextV1DE16ByteSaltResult` tagged-union.
+ */
+np_ffi_NextV1DE16ByteSaltResultKind np_ffi_NextV1DE16ByteSaltResult_kind(np_ffi_NextV1DE16ByteSaltResult result);
+
+/**
+ * Casts a `NextV1DE16ByteSaltResult` to the `Success` variant,
+ * panicking in the case where the passed value is of a different enum variant.
+ */
+np_ffi_FixedSizeArray_16 np_ffi_NextV1DE16ByteSaltResult_into_SUCCESS(np_ffi_NextV1DE16ByteSaltResult result);
+
+/**
+ * Adds the section constructed behind the given handle to
+ * a section builder to the containing advertisement it originated from.
+ * After this call, the section builder handle will become invalid.
+ */
+np_ffi_AddV1SectionToAdvertisementResult np_ffi_V1SectionBuilder_add_to_advertisement(np_ffi_V1SectionBuilder section_builder);
+
+/**
+ * Attempts to get the derived 16-byte V1 DE salt for the next
+ * DE to be added to the passed section builder. May fail if this
+ * section builder handle is invalid, or if the section
+ * is a public section.
+ */
+np_ffi_NextV1DE16ByteSaltResult np_ffi_V1SectionBuilder_next_de_salt(np_ffi_V1SectionBuilder section_builder);
+
+/**
+ * Attempts to add the given DE to the section builder behind
+ * this handle. The passed DE may have a payload of up to 127
+ * bytes, the maximum for a V1 DE.
+ */
+np_ffi_AddV1DEResult np_ffi_V1SectionBuilder_add_127_byte_buffer_de(np_ffi_V1SectionBuilder section_builder,
+                                                                    np_ffi_V1DE127ByteBuffer de);
+
+/**
+ * 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);
+
+/**
+ * Upcasts a Tx power DE to a generic V0 data-element.
+ */
+np_ffi_V0DataElement np_ffi_TxPower_into_V0DataElement(np_ffi_TxPower tx_power);
+
+/**
+ * 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);
+
+/**
+ * Upcasts a V0 actions DE to a generic V0 data-element.
+ */
+np_ffi_V0DataElement np_ffi_V0Actions_into_V0DataElement(np_ffi_V0Actions actions);
+
+/**
+ * Gets the tag of a `BuildTxPowerResult` tagged-union.
+ */
+np_ffi_BuildTxPowerResultKind np_ffi_BuildTxPowerResult_kind(np_ffi_BuildTxPowerResult result);
+
+/**
+ * Casts a `BuildTxPowerResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_TxPower np_ffi_BuildTxPowerResult_into_SUCCESS(np_ffi_BuildTxPowerResult result);
+
+/**
+ * Attempts to construct a new TxPower from
+ * the given signed-byte value.
+ */
+np_ffi_BuildTxPowerResult np_ffi_TxPower_build_from_signed_byte(int8_t tx_power);
+
+/**
+ * Gets the value of the given TxPower as a signed byte.
+ */
+int8_t np_ffi_TxPower_as_signed_byte(np_ffi_TxPower tx_power);
+
+/**
+ * Gets the discriminant of the `SetV0ActionResult` tagged-union.
+ */
+np_ffi_SetV0ActionResultKind np_ffi_SetV0ActionResult_kind(np_ffi_SetV0ActionResult result);
+
+/**
+ * Attempts to cast a `SetV0ActionResult` tagged-union into the `Success` variant.
+ */
+np_ffi_V0Actions np_ffi_SetV0ActionResult_into_SUCCESS(np_ffi_SetV0ActionResult result);
+
+/**
+ * Attempts to cast a `SetV0ActionResult` tagged-union into the `Error` variant.
+ */
+np_ffi_V0Actions np_ffi_SetV0ActionResult_into_ERROR(np_ffi_SetV0ActionResult result);
+
+/**
+ * Constructs a new V0 actions DE with no declared boolean
+ * actions and a zeroed context sync sequence number,
+ * where the DE is intended for the given advertisement
+ * kind (plaintext/encrypted).
+ */
+np_ffi_V0Actions np_ffi_build_new_zeroed_V0Actions(np_ffi_AdvertisementBuilderKind kind);
+
+/**
+ * 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
+ */
+np_ffi_ContextSyncSeqNum np_ffi_V0Actions_get_context_sync_sequence_number(np_ffi_V0Actions actions);
+
+/**
+ * Attempts to set the given action bit to the given boolean value.
+ * This operation may fail if the requested action bit may not be
+ * set for the kind of containing advertisement (public/encrypted)
+ * that this action DE is intended to belong to. In this case,
+ * the original action bits will be yielded back to the caller,
+ * unaltered.
+ */
+np_ffi_SetV0ActionResult np_ffi_V0Actions_set_action(np_ffi_V0Actions actions,
+                                                     np_ffi_BooleanActionType action_type,
+                                                     bool value);
+
+/**
+ * Sets the context sequence number for the given Actions DE.
+ */
+np_ffi_V0Actions np_ffi_V0Actions_set_context_sync_sequence_number(np_ffi_V0Actions actions,
+                                                                   np_ffi_ContextSyncSeqNum value);
+
+/**
+ * Returns the representation of the passed `V0Actions` as an unsigned
+ * integer, where the bit-positions correspond to individual actions.
+ */
+uint32_t np_ffi_V0Actions_as_u32(np_ffi_V0Actions actions);
+
+/**
+ * Gets the tag of a `BuildContextSyncSeqNumResult` tagged-union.
+ */
+np_ffi_BuildContextSyncSeqNumResultKind np_ffi_BuildContextSyncSeqNumResult_kind(np_ffi_BuildContextSyncSeqNumResult result);
+
+/**
+ * Casts a `BuildContextSyncSeqNumResult` to the `Success` variant, panicking in the
+ * case where the passed value is of a different enum variant.
+ */
+np_ffi_ContextSyncSeqNum np_ffi_BuildContextSyncSeqNumResult_into_SUCCESS(np_ffi_BuildContextSyncSeqNumResult result);
+
+/**
+ * Attempts to build a new context sync sequence number
+ * from the given unsigned byte.
+ */
+np_ffi_BuildContextSyncSeqNumResult np_ffi_ContextSyncSeqNum_build_from_unsigned_byte(uint8_t value);
+
+/**
+ * Gets the value of the given context-sync sequence number as an unsigned byte.
+ */
+uint8_t np_ffi_ContextSyncSeqNum_as_unsigned_byte(np_ffi_ContextSyncSeqNum seq_num);
+
+/**
  * Converts a `V1DataElement` to a `GenericV1DataElement` which
  * only maintains information about the DE's type-code and payload.
  */
@@ -1050,3 +2320,5 @@
  * an unsigned 32-bit integer.
  */
 uint32_t np_ffi_V1DEType_to_uint32_t(np_ffi_V1DEType de_type);
+
+// clang-format on

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
index ad3ec24..51322d3 100644
--- 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

@@ -13,10 +13,12 @@
  limitations under the License.
 */
 
+// clang-format off
+
 
 #pragma once
 
-/* Generated with cbindgen:0.24.5 */
+/* Generated with cbindgen:0.26.0 */
 
 /*
  WARNING: this file is autogenerated by cbindgen. Don't modify this manually.
@@ -133,6 +135,36 @@
 /// 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);
 
+/// Sets the maximum number of active handles to v0 advertisement
+/// builders 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 V0 advertisement builder.
+void np_ffi_global_config_set_max_num_v0_advertisement_builders(uint32_t max_num_v0_advertisement_builders);
+
+/// Sets the maximum number of active handles to v1 advertisement
+/// builders 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 V1 advertisement builder.
+void np_ffi_global_config_set_max_num_v1_advertisement_builders(uint32_t max_num_v1_advertisement_builders);
+
 /// Allocates a new credential-book from the given slab, returning a handle
 /// to the created object. The slab will be deallocated by this call.
 CreateCredentialBookResult np_ffi_create_credential_book_from_slab(CredentialSlab slab);
@@ -166,8 +198,8 @@
 /// Safety: this is safe if the provided pointer points to a valid memory address
 /// which contains the correct len amount of bytes. The copy from the memory address isn't atomic,
 /// so concurrent modification of the array from another thread would cause undefined behavior.
-AddCredentialToSlabResult np_ffi_CredentialSlab_add_v0_credential(CredentialSlab credential_slab,
-                                                                  V0MatchableCredential v0_cred);
+AddV0CredentialToSlabResult np_ffi_CredentialSlab_add_v0_credential(CredentialSlab credential_slab,
+                                                                    V0MatchableCredential v0_cred);
 
 /// Adds the given V1 discovery credential with some associated
 /// match-data to this credential slab.
@@ -175,8 +207,32 @@
 /// Safety: this is safe if the provided pointer points to a valid memory address
 /// which contains the correct len amount of bytes. The copy from the memory address isn't atomic,
 /// so concurrent modification of the array from another thread would cause undefined behavior.
-AddCredentialToSlabResult np_ffi_CredentialSlab_add_v1_credential(CredentialSlab credential_slab,
-                                                                  V1MatchableCredential v1_cred);
+AddV1CredentialToSlabResult np_ffi_CredentialSlab_add_v1_credential(CredentialSlab credential_slab,
+                                                                    V1MatchableCredential v1_cred);
+
+/// Frees the underlying resources of the decrypted metadata buffer
+DeallocateResult np_ffi_deallocate_DecryptedMetadata(DecryptedMetadata metadata);
+
+/// Gets the tag of a `DecryptMetadataResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `DecryptMetadataResult#into_success`.
+DecryptMetadataResultKind np_ffi_DecryptMetadataResult_kind(DecryptMetadataResult result);
+
+/// Casts a `DecryptMetadataResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+DecryptedMetadata np_ffi_DecryptMetadataResult_into_SUCCESS(DecryptMetadataResult result);
+
+/// Gets the pointer and length of the heap allocated byte buffer of decrypted metadata
+GetMetadataBufferPartsResult np_ffi_DecryptedMetadata_get_metadata_buffer_parts(DecryptedMetadata metadata);
+
+/// Gets the tag of a `GetMetadataBufferPartsResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `GetMetadataBufferPartsResult#into_success`.
+GetMetadataBufferPartsResultKind np_ffi_GetMetadataBufferPartsResult_kind(GetMetadataBufferPartsResult result);
+
+/// Casts a `GetMetadataBufferPartsResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant. This returns the pointer and length
+/// of the byte buffer containing the decrypted metadata.  There can be a data-race between attempts
+/// to access the contents of the buffer and attempts to free the handle from different threads.
+MetadataBufferParts np_ffi_GetMetadataBufferPartsResult_into_SUCCESS(GetMetadataBufferPartsResult result);
 
 /// Attempts to deserialize an advertisement with the given service-data
 /// payload (presumed to be under the NP service UUID) using credentials
@@ -229,6 +285,21 @@
 /// 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);
 
+/// Attempts to decrypt the metadata for the matched credential for this V0 payload (if any)
+DecryptMetadataResult np_ffi_V0Payload_decrypt_metadata(V0Payload payload);
+
+/// Gets the identity details for this V0 payload, or returns an error if this payload does not have
+/// any associated identity (public advertisement)
+GetV0IdentityDetailsResult np_ffi_V0Payload_get_identity_details(V0Payload payload);
+
+/// Gets the tag of a `GetV0IdentityDetailsResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `GetV0IdentityDetailsResult#into_success`.
+GetV0IdentityDetailsResultKind np_ffi_GetV0IdentityDetailsResult_kind(GetV0IdentityDetailsResult result);
+
+/// Casts a `GetV0IdentityDetailsResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+DeserializedV0IdentityDetails np_ffi_GetV0IdentityDetailsResult_into_SUCCESS(GetV0IdentityDetailsResult result);
+
 /// Deallocates any internal data of a `V0Payload`
 DeallocateResult np_ffi_deallocate_v0_payload(V0Payload payload);
 
@@ -239,26 +310,6 @@
 /// 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`.
@@ -290,13 +341,252 @@
 /// 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 identity details used to decrypt this V1 section, or returns an error if this payload
+/// does not have any associated identity (public advertisement)
+GetV1IdentityDetailsResult np_ffi_DeserializedV1Section_get_identity_details(DeserializedV1Section section);
+
+/// Gets the tag of a `GetV1IdentityDetailsResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `GetV0IdentityDetailsResult#into_success`.
+GetV1IdentityDetailsResultKind np_ffi_GetV1IdentityDetailsResult_kind(GetV1IdentityDetailsResult result);
+
+/// Casts a `GetV1IdentityDetailsResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+DeserializedV1IdentityDetails np_ffi_GetV1IdentityDetailsResult_into_SUCCESS(GetV1IdentityDetailsResult result);
+
+/// Attempts to decrypt the metadata for the matched credential for this V0 payload (if any)
+DecryptMetadataResult np_ffi_DeserializedV1Section_decrypt_metadata(DeserializedV1Section section);
+
+/// Attempts to derive a 16-byte DE salt for a DE in this section with the given DE offset. This
+/// operation may fail if the passed offset is 255 (causes overflow) or if the section
+/// is leveraging a public identity, and hence, doesn't have an associated salt.
+GetV1DE16ByteSaltResult np_ffi_DeserializedV1Section_derive_16_byte_salt_for_offset(DeserializedV1Section section,
+                                                                                    uint8_t offset);
+
+/// Gets the tag of a `GetV1DE16ByteSaltResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `GetV1DE16ByteSaltResult#into_success`.
+GetV1DE16ByteSaltResultKind np_ffi_GetV1DE16ByteSaltResult_kind(GetV1DE16ByteSaltResult result);
+
+/// Casts a `GetV1DE16ByteSaltResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+FixedSizeArray<16> np_ffi_GetV1DE16ByteSaltResult_into_SUCCESS(GetV1DE16ByteSaltResult result);
+
 /// 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
+/// Casts a `GetV1DEResult` to the `Success` variant, panicking in the
 /// case where the passed value is of a different enum variant.
 V1DataElement np_ffi_GetV1DEResult_into_SUCCESS(GetV1DEResult result);
 
+/// Attempts to add the given data element to the V0
+/// advertisement builder behind the passed handle.
+///
+/// This method may invoke the panic handler if the passed DE
+/// has an invalid layout, which may indicate that the backing
+/// data on the stack was somehow tampered with in an unintended way.
+AddV0DEResult np_ffi_V0AdvertisementBuilder_add_de(V0AdvertisementBuilder adv_builder,
+                                                   V0DataElement de);
+
+/// Attempts to serialize the contents of the advertisement builder
+/// behind this handle to bytes. Assuming that the handle is valid,
+/// this operation will always result in the contents behind the
+/// advertisement builder handle being deallocated.
+SerializeV0AdvertisementResult np_ffi_V0AdvertisementBuilder_into_advertisement(V0AdvertisementBuilder adv_builder);
+
+/// Attempts to deallocate the v0 advertisement builder behind
+/// the given handle.
+DeallocateResult np_ffi_deallocate_v0_advertisement_builder(V0AdvertisementBuilder adv_builder);
+
+/// Gets the tag of a `CreateV0AdvertisementBuilderResult` tagged-union.
+CreateV0AdvertisementBuilderResultKind np_ffi_CreateV0AdvertisementBuilderResult_kind(CreateV0AdvertisementBuilderResult result);
+
+/// Casts a `CreateV0AdvertisementBuilderResult` to the `Success` variant,
+/// panicking in the case where the passed value is of a different enum variant.
+V0AdvertisementBuilder np_ffi_CreateV0AdvertisementBuilderResult_into_SUCCESS(CreateV0AdvertisementBuilderResult result);
+
+/// Creates a new V0 advertisement builder for a public advertisement.
+CreateV0AdvertisementBuilderResult np_ffi_create_v0_public_advertisement_builder();
+
+/// Creates a new V0 advertisement builder for an encrypted advertisement.
+CreateV0AdvertisementBuilderResult np_ffi_create_v0_encrypted_advertisement_builder(V0BroadcastCredential broadcast_cred,
+                                                                                    EncryptedIdentityType identity_type,
+                                                                                    FixedSizeArray<2> salt);
+
+/// Gets the tag of a `SerializeV0AdvertisementResult` tagged-union.
+SerializeV0AdvertisementResultKind np_ffi_SerializeV0AdvertisementResult_kind(SerializeV0AdvertisementResult result);
+
+/// Casts a `SerializeV0AdvertisementResult` to the `Success` variant,
+/// panicking in the case where the passed value is of a different enum variant.
+ByteBuffer<24> np_ffi_SerializeV0AdvertisementResult_into_SUCCESS(SerializeV0AdvertisementResult result);
+
+/// Attempts to create a builder for a new public section within
+/// the advertisement builder behind this handle,
+/// returning a handle to the newly-created section builder if successful.
+///
+/// This method may fail if there is another currently-active
+/// section builder for the same advertisement builder, if the
+/// kind of section being added does not match the advertisement
+/// type (public/encrypted), or if the section would not manage
+/// to fit within the enclosing advertisement.
+CreateV1SectionBuilderResult np_ffi_V1AdvertisementBuilder_public_section_builder(V1AdvertisementBuilder adv_builder);
+
+/// Attempts to create a builder for a new encrypted section within
+/// the advertisement builder behind the given handle,
+/// returning a handle to the newly-created section builder if successful.
+///
+/// The identity details for the new section builder may be specified
+/// via providing the broadcast credential data, the kind of encrypted
+/// identity being broadcast (private/trusted/provisioned), and the
+/// verification mode (MIC/Signature) to be used for the encrypted section.
+///
+/// This method may fail if there is another currently-active
+/// section builder for the same advertisement builder, if the
+/// kind of section being added does not match the advertisement
+/// type (public/encrypted), or if the section would not manage
+/// to fit within the enclosing advertisement.
+CreateV1SectionBuilderResult np_ffi_V1AdvertisementBuilder_encrypted_section_builder(V1AdvertisementBuilder adv_builder,
+                                                                                     V1BroadcastCredential broadcast_cred,
+                                                                                     EncryptedIdentityType identity_type,
+                                                                                     V1VerificationMode verification_mode);
+
+/// Attempts to serialize the contents of the advertisement builder
+/// behind this handle to bytes. Assuming that the handle is valid,
+/// this operation will always result in the contents behind the
+/// advertisement builder handle being deallocated.
+SerializeV1AdvertisementResult np_ffi_V1AdvertisementBuilder_into_advertisement(V1AdvertisementBuilder adv_builder);
+
+/// Gets the tag of a `CreateV1AdvertisementBuilderResult` tagged-union.
+CreateV1AdvertisementBuilderResultKind np_ffi_CreateV1AdvertisementBuilderResult_kind(CreateV1AdvertisementBuilderResult result);
+
+/// Casts a `CreateV1AdvertisementBuilderResult` to the `Success` variant,
+/// panicking in the case where the passed value is of a different enum variant.
+V1AdvertisementBuilder np_ffi_CreateV1AdvertisementBuilderResult_into_SUCCESS(CreateV1AdvertisementBuilderResult result);
+
+/// Creates a new V1 advertisement builder for the given advertisement
+/// kind (public/encrypted).
+CreateV1AdvertisementBuilderResult np_ffi_create_v1_advertisement_builder(AdvertisementBuilderKind kind);
+
+/// Gets the tag of a `SerializeV1AdvertisementResult` tagged-union.
+SerializeV1AdvertisementResultKind np_ffi_SerializeV1AdvertisementResult_kind(SerializeV1AdvertisementResult result);
+
+/// Casts a `SerializeV1AdvertisementResult` to the `Success` variant,
+/// panicking in the case where the passed value is of a different enum variant.
+ByteBuffer<250> np_ffi_SerializeV1AdvertisementResult_into_SUCCESS(SerializeV1AdvertisementResult result);
+
+/// Gets the tag of a `CreateV1SectionBuilderResult` tagged-union.
+CreateV1SectionBuilderResultKind np_ffi_CreateV1SectionBuilderResult_kind(CreateV1SectionBuilderResult result);
+
+/// Casts a `CreateV1SectionBuilderResult` to the `Success` variant,
+/// panicking in the case where the passed value is of a different enum variant.
+V1SectionBuilder np_ffi_CreateV1SectionBuilderResult_into_SUCCESS(CreateV1SectionBuilderResult result);
+
+/// Gets the tag of a `NextV1DE16ByteSaltResult` tagged-union.
+NextV1DE16ByteSaltResultKind np_ffi_NextV1DE16ByteSaltResult_kind(NextV1DE16ByteSaltResult result);
+
+/// Casts a `NextV1DE16ByteSaltResult` to the `Success` variant,
+/// panicking in the case where the passed value is of a different enum variant.
+FixedSizeArray<16> np_ffi_NextV1DE16ByteSaltResult_into_SUCCESS(NextV1DE16ByteSaltResult result);
+
+/// Adds the section constructed behind the given handle to
+/// a section builder to the containing advertisement it originated from.
+/// After this call, the section builder handle will become invalid.
+AddV1SectionToAdvertisementResult np_ffi_V1SectionBuilder_add_to_advertisement(V1SectionBuilder section_builder);
+
+/// Attempts to get the derived 16-byte V1 DE salt for the next
+/// DE to be added to the passed section builder. May fail if this
+/// section builder handle is invalid, or if the section
+/// is a public section.
+NextV1DE16ByteSaltResult np_ffi_V1SectionBuilder_next_de_salt(V1SectionBuilder section_builder);
+
+/// Attempts to add the given DE to the section builder behind
+/// this handle. The passed DE may have a payload of up to 127
+/// bytes, the maximum for a V1 DE.
+AddV1DEResult np_ffi_V1SectionBuilder_add_127_byte_buffer_de(V1SectionBuilder section_builder,
+                                                             V1DE127ByteBuffer de);
+
+/// 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);
+
+/// Upcasts a Tx power DE to a generic V0 data-element.
+V0DataElement np_ffi_TxPower_into_V0DataElement(TxPower tx_power);
+
+/// 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);
+
+/// Upcasts a V0 actions DE to a generic V0 data-element.
+V0DataElement np_ffi_V0Actions_into_V0DataElement(V0Actions actions);
+
+/// Gets the tag of a `BuildTxPowerResult` tagged-union.
+BuildTxPowerResultKind np_ffi_BuildTxPowerResult_kind(BuildTxPowerResult result);
+
+/// Casts a `BuildTxPowerResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+TxPower np_ffi_BuildTxPowerResult_into_SUCCESS(BuildTxPowerResult result);
+
+/// Attempts to construct a new TxPower from
+/// the given signed-byte value.
+BuildTxPowerResult np_ffi_TxPower_build_from_signed_byte(int8_t tx_power);
+
+/// Gets the value of the given TxPower as a signed byte.
+int8_t np_ffi_TxPower_as_signed_byte(TxPower tx_power);
+
+/// Gets the discriminant of the `SetV0ActionResult` tagged-union.
+SetV0ActionResultKind np_ffi_SetV0ActionResult_kind(SetV0ActionResult result);
+
+/// Attempts to cast a `SetV0ActionResult` tagged-union into the `Success` variant.
+V0Actions np_ffi_SetV0ActionResult_into_SUCCESS(SetV0ActionResult result);
+
+/// Attempts to cast a `SetV0ActionResult` tagged-union into the `Error` variant.
+V0Actions np_ffi_SetV0ActionResult_into_ERROR(SetV0ActionResult result);
+
+/// Constructs a new V0 actions DE with no declared boolean
+/// actions and a zeroed context sync sequence number,
+/// where the DE is intended for the given advertisement
+/// kind (plaintext/encrypted).
+V0Actions np_ffi_build_new_zeroed_V0Actions(AdvertisementBuilderKind kind);
+
+/// 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
+ContextSyncSeqNum np_ffi_V0Actions_get_context_sync_sequence_number(V0Actions actions);
+
+/// Attempts to set the given action bit to the given boolean value.
+/// This operation may fail if the requested action bit may not be
+/// set for the kind of containing advertisement (public/encrypted)
+/// that this action DE is intended to belong to. In this case,
+/// the original action bits will be yielded back to the caller,
+/// unaltered.
+SetV0ActionResult np_ffi_V0Actions_set_action(V0Actions actions,
+                                              BooleanActionType action_type,
+                                              bool value);
+
+/// Sets the context sequence number for the given Actions DE.
+V0Actions np_ffi_V0Actions_set_context_sync_sequence_number(V0Actions actions,
+                                                            ContextSyncSeqNum value);
+
+/// Returns the representation of the passed `V0Actions` as an unsigned
+/// integer, where the bit-positions correspond to individual actions.
+uint32_t np_ffi_V0Actions_as_u32(V0Actions actions);
+
+/// Gets the tag of a `BuildContextSyncSeqNumResult` tagged-union.
+BuildContextSyncSeqNumResultKind np_ffi_BuildContextSyncSeqNumResult_kind(BuildContextSyncSeqNumResult result);
+
+/// Casts a `BuildContextSyncSeqNumResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant.
+ContextSyncSeqNum np_ffi_BuildContextSyncSeqNumResult_into_SUCCESS(BuildContextSyncSeqNumResult result);
+
+/// Attempts to build a new context sync sequence number
+/// from the given unsigned byte.
+BuildContextSyncSeqNumResult np_ffi_ContextSyncSeqNum_build_from_unsigned_byte(uint8_t value);
+
+/// Gets the value of the given context-sync sequence number as an unsigned byte.
+uint8_t np_ffi_ContextSyncSeqNum_as_unsigned_byte(ContextSyncSeqNum seq_num);
+
 /// 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);
@@ -309,3 +599,5 @@
 
 } // namespace internal
 } // namespace np_ffi
+
+// clang-format on

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
index d39bb70..5e4e5a2 100644
--- 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

@@ -13,10 +13,12 @@
  limitations under the License.
 */
 
+// clang-format off
+
 
 #pragma once
 
-/* Generated with cbindgen:0.24.5 */
+/* Generated with cbindgen:0.26.0 */
 
 /*
  WARNING: this file is autogenerated by cbindgen. Don't modify this manually.
@@ -36,14 +38,80 @@
 namespace np_ffi {
 namespace internal {
 
-/// Result type for trying to add a credential to a credential-slab.
-enum class AddCredentialToSlabResult : uint8_t {
+/// Result type for trying to add a V0 credential to a credential-slab.
+enum class AddV0CredentialToSlabResult : uint8_t {
   /// We succeeded in adding the credential to the slab.
   Success = 0,
   /// The handle to the slab was actually invalid.
   InvalidHandle = 1,
 };
 
+/// Result code for the operation of adding a DE to a V0
+/// advertisement builder.
+enum class AddV0DEResult : uint8_t {
+  /// The DE was successfully added to the advertisement builder
+  /// behind the given handle.
+  Success = 0,
+  /// The handle for the advertisement builder was invalid.
+  InvalidAdvertisementBuilderHandle = 1,
+  /// There was not enough available space left in the advertisement
+  /// to append the given data element.
+  InsufficientAdvertisementSpace = 2,
+  /// The passed data element is not broadcastable under the
+  /// identity type of the advertisement (public/private).
+  InvalidIdentityTypeForDataElement = 3,
+};
+
+/// Result type for trying to add a V1 credential to a credential-slab.
+enum class AddV1CredentialToSlabResult : uint8_t {
+  /// We succeeded in adding the credential to the slab.
+  Success = 0,
+  /// The handle to the slab was actually invalid.
+  InvalidHandle = 1,
+  /// The provided public key bytes do not actually represent a valid "edwards y" format
+  /// or that said compressed point is not actually a point on the curve.
+  InvalidPublicKeyBytes = 2,
+};
+
+/// Result code for operations adding DEs to a section builder.
+enum class AddV1DEResult : uint8_t {
+  /// The DE was successfully added to the section builder
+  /// behind the given handle.
+  Success = 0,
+  /// The handle for the section builder was invalid.
+  InvalidSectionHandle = 1,
+  /// There was no more space left in the advertisement
+  /// to fit the DE in the containing section.
+  InsufficientSectionSpace = 2,
+  /// The data element itself had invalid characteristics,
+  /// most likely a length above 127.
+  InvalidDataElement = 3,
+};
+
+/// Result code for [`V1SectionBuilder#add_to_advertisement`].
+enum class AddV1SectionToAdvertisementResult : uint8_t {
+  /// The section referenced by the given handle
+  /// couldn't be added to the containing advertisement,
+  /// possibly because the handle is invalid or the section
+  /// has already been added to the containing section.
+  Error = 0,
+  /// The section referenced by the given handle
+  /// was successfully added to the containing advertisement.
+  /// After obtaining this result code, the section
+  /// handle will no longer be valid.
+  Success = 1,
+};
+
+/// Enum common to V0 and V1 serialization expressing
+/// what kind of advertisement builder (public/encrypted)
+/// is in use.
+enum class AdvertisementBuilderKind : uint8_t {
+  /// The builder is for a public advertisement.
+  Public = 0,
+  /// The builder is for an encrypted advertisement.
+  Encrypted = 1,
+};
+
 /// The possible boolean action types which can be present in an Actions data element
 enum class BooleanActionType : uint8_t {
   ActiveUnlock = 8,
@@ -55,6 +123,26 @@
   FastPairSass = 14,
 };
 
+/// Discriminant for `BuildContextSyncSeqNumResult`.
+enum class BuildContextSyncSeqNumResultKind : uint8_t {
+  /// The sequence number was outside the allowed
+  /// 0-15 single-nibble range.
+  OutOfRange = 0,
+  /// The sequence number was in range,
+  /// and so a `ContextSyncSeqNum` was constructed.
+  Success = 1,
+};
+
+/// Discriminant for `BuildTxPowerResult`.
+enum class BuildTxPowerResultKind : uint8_t {
+  /// The transmission power was outside the
+  /// allowed -100dBm to 20dBm range.
+  OutOfRange = 0,
+  /// The transmission power was in range,
+  /// and so a `TxPower` struct was constructed.
+  Success = 1,
+};
+
 /// Discriminant for `CreateCredentialBookResult`
 enum class CreateCredentialBookResultKind : uint8_t {
   /// We created a new credential book behind the given handle.
@@ -78,6 +166,49 @@
   Success = 1,
 };
 
+/// Discriminant for `CreateV0AdvertisementBuilderResult`
+enum class CreateV0AdvertisementBuilderResultKind : uint8_t {
+  /// The attempt to create a new advertisement builder
+  /// failed since there are no more available
+  /// slots for V0 advertisement builders in their handle-map.
+  NoSpaceLeft = 0,
+  /// The attempt succeeded. The wrapped advertisement builder
+  /// may be obtained via
+  /// `CreateV0AdvertisementBuilderResult#into_success`.
+  Success = 1,
+};
+
+/// Discriminant for `CreateV1AdvertisementBuilderResult`
+enum class CreateV1AdvertisementBuilderResultKind : uint8_t {
+  /// The attempt to create a new advertisement builder
+  /// failed since there are no more available
+  /// slots for V1 advertisement builders in their handle-map.
+  NoSpaceLeft = 0,
+  /// The attempt succeeded. The wrapped advertisement builder
+  /// may be obtained via
+  /// `CreateV1AdvertisementBuilderResult#into_success`.
+  Success = 1,
+};
+
+/// Discriminant for `CreateV1SectionBuilderResult`
+enum class CreateV1SectionBuilderResultKind : uint8_t {
+  /// The attempt to create a new section builder succeeded.
+  Success = 0,
+  /// We're currently in the middle of building a section.
+  UnclosedActiveSection = 1,
+  /// The advertisement builder handle was invalid.
+  InvalidAdvertisementBuilderHandle = 2,
+  /// We're attempting to build a section with an identity
+  /// kind (public/encrypted) which doesn't match the kind
+  /// for the entire advertisement.
+  IdentityKindMismatch = 3,
+  /// There isn't enough space for a new section, either
+  /// because the maximum section count has been exceeded
+  /// or because the advertisement is almost full, and
+  /// the minimum size of a section wouldn't fit.
+  NoSpaceLeft = 4,
+};
+
 /// 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 {
@@ -87,6 +218,17 @@
   Success = 1,
 };
 
+/// Discriminant for `DecryptMetadataResult`.
+enum class DecryptMetadataResultKind : uint8_t {
+  /// The attempt to decrypt the metadata of the associated credential succeeded
+  /// The associated payload may be obtained via
+  /// `DecryptMetadataResult#into_success`.
+  Success,
+  /// The attempt to decrypt the metadata failed, either the payload had no matching identity
+  /// ie it was a public advertisement OR the decrypt attempt itself was unsuccessful
+  Error,
+};
+
 /// Discriminant for `DeserializeAdvertisementResult`.
 enum class DeserializeAdvertisementResultKind : uint8_t {
   /// Deserializing the advertisement failed, for some reason or another.
@@ -132,6 +274,24 @@
   Decrypted = 1,
 };
 
+/// The DE type for an encrypted identity
+enum class EncryptedIdentityType : uint8_t {
+  /// Identity for broadcasts to nearby devices with the same
+  /// logged-in-account (for some account).
+  Private = 1,
+  /// Identity for broadcasts to nearby devices which this
+  /// device has declared to trust.
+  Trusted = 2,
+  /// Identity for broadcasts to devices which have been provisioned
+  /// offline with this device.
+  Provisioned = 4,
+};
+
+enum class GetMetadataBufferPartsResultKind : uint8_t {
+  Success = 0,
+  Error = 1,
+};
+
 /// Discriminant of `GetV0DEResult`.
 enum class GetV0DEResultKind : uint8_t {
   /// The attempt to get the DE succeeded.
@@ -145,6 +305,33 @@
   Error = 1,
 };
 
+/// Discriminant for `GetV0IdentityDetailsResult`
+enum class GetV0IdentityDetailsResultKind : uint8_t {
+  /// The attempt to get the identity details
+  /// for the advertisement failed, possibly
+  /// due to the advertisement being a public
+  /// advertisement, or the underlying
+  /// advertisement has already been deallocated.
+  Error = 0,
+  /// The attempt to get the identity details succeeded.
+  /// The wrapped identity details may be obtained via
+  /// `GetV0IdentityDetailsResult#into_success`.
+  Success = 1,
+};
+
+/// Discriminant for `GetV1DE16ByteSaltResult`.
+enum class GetV1DE16ByteSaltResultKind : uint8_t {
+  /// The attempt to get the derived salt failed, possibly
+  /// because the passed DE offset was invalid (==255),
+  /// or because there was no salt included for the
+  /// referenced advertisement section (i.e: it was
+  /// a public advertisement section, or it was deallocated.)
+  Error = 0,
+  /// A 16-byte salt for the given DE offset was successfully
+  /// derived.
+  Success = 1,
+};
+
 /// Discriminant for the `GetV1DEResult` enum.
 enum class GetV1DEResultKind : uint8_t {
   /// Attempting to get the DE at the given position failed,
@@ -156,6 +343,20 @@
   Success = 1,
 };
 
+/// Discriminant for `GetV1IdentityDetailsResult`
+enum class GetV1IdentityDetailsResultKind : uint8_t {
+  /// The attempt to get the identity details
+  /// for the section failed, possibly
+  /// due to the section being a public
+  /// section, or the underlying
+  /// advertisement has already been deallocated.
+  Error = 0,
+  /// The attempt to get the identity details succeeded.
+  /// The wrapped identity details may be obtained via
+  /// `GetV1IdentityDetailsResult#into_success`.
+  Success = 1,
+};
+
 /// Discriminant for `GetV1SectionResult`
 enum class GetV1SectionResultKind : uint8_t {
   /// The attempt to get the section failed,
@@ -169,6 +370,17 @@
   Success = 1,
 };
 
+/// Discriminant for `NextV1DE16ByteSaltResult`.
+enum class NextV1DE16ByteSaltResultKind : uint8_t {
+  /// We couldn't return a 16-byte DE salt, possibly
+  /// because the handle to the section builder
+  /// was invalid, or possibly because the section
+  /// builder was for a public section.
+  Error = 0,
+  /// A 16-byte DE salt was returned successfully.
+  Success = 1,
+};
+
 /// Structure for categorized reasons for why a NP C FFI call may
 /// be panicking.
 enum class PanicReason : uint8_t {
@@ -182,10 +394,50 @@
   /// 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,
+  /// Error returned if the bit representation of a supposedly-Rust-constructed
+  /// -and-validated type actually doesn't correspond to the format of the
+  /// data structure expected on the Rust side of the boundary, and performing
+  /// further operations on the structure would yield unintended behavior.
+  /// If this kind of error is being raised, the C code must
+  /// be messing with stack-allocated data structures for this library
+  /// in an entirely unexpected way.
+  InvalidStackDataStructure = 2,
+};
+
+/// Discriminant for `SerializeV0AdvertisementResult`.
+enum class SerializeV0AdvertisementResultKind : uint8_t {
+  /// Serializing the advertisement to bytes was successful.
+  Success = 0,
+  /// Serializing the advertisement to bytes failed
+  /// because the data in the advertisement wasn't
+  /// of an appropriate size for LDT encryption
+  /// to succeed.
+  LdtError = 1,
+  /// The advertisement builder handle was invalid.
+  InvalidAdvertisementBuilderHandle = 2,
+};
+
+/// Discriminant for `SerializeV1AdvertisementResult`.
+enum class SerializeV1AdvertisementResultKind : uint8_t {
+  /// Serializing the advertisement to bytes was successful.
+  Success = 0,
+  /// The state of the advertisement builder was invalid
+  /// for the builder to be closed for serialization, likely
+  /// because there was an unclosed section builder.
+  InvalidBuilderState = 1,
+  /// The advertisement builder handle was invalid.
+  InvalidAdvertisementBuilderHandle = 2,
+};
+
+/// Discriminant for `SetV0ActionResult`.
+enum class SetV0ActionResultKind : uint8_t {
+  /// The attempt to set the action bit failed. The
+  /// action bits were yielded back to the caller,
+  /// unmodified.
+  Error = 0,
+  /// The attempt to set the action bit succeeded.
+  /// The updated action bits were yielded back to the caller.
+  Success = 1,
 };
 
 /// Discriminant for `V0DataElement`.
@@ -200,7 +452,17 @@
   Actions = 1,
 };
 
-///A `#[repr(C)]` handle to a value of type `super::CredentialBookInternals`.
+/// Information about the verification scheme used
+/// for verifying the integrity of the contents
+/// of a decrypted section.
+enum class V1VerificationMode : uint8_t {
+  /// Message integrity code verification.
+  Mic = 0,
+  /// Signature verification.
+  Signature = 1,
+};
+
+/// A `#[repr(C)]` handle to a value of type `CredentialBookInternals`
 struct CredentialBook {
   uint64_t handle_id;
 };
@@ -224,7 +486,7 @@
   Success_Body success;
 };
 
-///A `#[repr(C)]` handle to a value of type `super::CredentialSlabInternals`.
+/// A `#[repr(C)]` handle to a value of type `CredentialSlabInternals`
 struct CredentialSlab {
   uint64_t handle_id;
 };
@@ -285,7 +547,51 @@
   FfiMatchedCredential matched_cred;
 };
 
-///A `#[repr(C)]` handle to a value of type `super::V0PayloadInternals`.
+/// A `#[repr(C)]` handle to a value of type `DecryptedMetadataInternals`
+struct DecryptedMetadata {
+  uint64_t handle_id;
+};
+
+/// The result of decrypting metadata from either a V0Payload or DeserializedV1Section
+struct DecryptMetadataResult {
+  enum class Tag {
+    Success,
+    Error,
+  };
+
+  struct Success_Body {
+    DecryptedMetadata _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// The pointer and length of the decrypted metadata byte buffer
+struct MetadataBufferParts {
+  const uint8_t *ptr;
+  uintptr_t len;
+};
+
+struct GetMetadataBufferPartsResult {
+  enum class Tag {
+    Success,
+    Error,
+  };
+
+  struct Success_Body {
+    MetadataBufferParts _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// A `#[repr(C)]` handle to a value of type `V0PayloadInternals`
 struct V0Payload {
   uint64_t handle_id;
 };
@@ -314,7 +620,7 @@
   };
 };
 
-///A `#[repr(C)]` handle to a value of type `super::LegibleV1SectionsInternals`.
+/// A `#[repr(C)]` handle to a value of type `LegibleV1SectionsInternals`
 struct LegibleV1Sections {
   uint64_t handle_id;
 };
@@ -449,6 +755,39 @@
   };
 };
 
+/// Information about the identity which matched a
+/// decrypted V0 advertisement.
+struct DeserializedV0IdentityDetails {
+  /// The identity type (private/provisioned/trusted)
+  EncryptedIdentityType identity_type;
+  /// The ID of the credential which
+  /// matched the deserialized adv
+  uint32_t cred_id;
+  /// The 14-byte legacy metadata key
+  uint8_t metadata_key[14];
+  /// The 2-byte advertisement salt
+  uint8_t salt[2];
+};
+
+/// The result of attempting to get the identity details
+/// for a V0 advertisement via
+/// `DeserializedV0Advertisement#get_identity_details`.
+struct GetV0IdentityDetailsResult {
+  enum class Tag {
+    Error,
+    Success,
+  };
+
+  struct Success_Body {
+    DeserializedV0IdentityDetails _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
 /// Handle to a deserialized V1 section
 struct DeserializedV1Section {
   LegibleV1Sections legible_sections_handle;
@@ -531,5 +870,297 @@
   };
 };
 
+/// Information about the identity which matched
+/// a decrypted V1 section.
+struct DeserializedV1IdentityDetails {
+  /// The identity type (private/provisioned/trusted)
+  EncryptedIdentityType identity_type;
+  /// The verification mode (MIC/Signature) which
+  /// was used to verify the decrypted adv contents.
+  V1VerificationMode verification_mode;
+  /// The ID of the credential which
+  /// matched the deserialized section.
+  uint32_t cred_id;
+  /// The 16-byte metadata key.
+  uint8_t metadata_key[16];
+};
+
+/// The result of attempting to get the identity details
+/// for a V1 advertisement section via
+/// `DeserializedV1Advertisement#get_identity_details`.
+struct GetV1IdentityDetailsResult {
+  enum class Tag {
+    Error,
+    Success,
+  };
+
+  struct Success_Body {
+    DeserializedV1IdentityDetails _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// A FFI safe wrapper of a fixed size array
+template<uintptr_t N>
+struct FixedSizeArray {
+  uint8_t _0[N];
+};
+
+/// The result of attempting to get a derived 16-byte salt
+/// for a given DE within a section.
+struct GetV1DE16ByteSaltResult {
+  enum class Tag {
+    Error,
+    Success,
+  };
+
+  struct Success_Body {
+    FixedSizeArray<16> _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// A `#[repr(C)]` handle to a value of type `V0AdvertisementBuilderInternals`
+struct V0AdvertisementBuilderHandle {
+  uint64_t handle_id;
+};
+
+/// A handle to a builder for V0 advertisements.
+struct V0AdvertisementBuilder {
+  AdvertisementBuilderKind kind;
+  V0AdvertisementBuilderHandle handle;
+};
+
+/// The result of attempting to serialize the contents
+/// of a V0 advertisement builder to raw bytes.
+struct SerializeV0AdvertisementResult {
+  enum class Tag {
+    Success,
+    LdtError,
+    InvalidAdvertisementBuilderHandle,
+  };
+
+  struct Success_Body {
+    ByteBuffer<24> _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// The result of attempting to create a new V0 advertisement builder.
+struct CreateV0AdvertisementBuilderResult {
+  enum class Tag {
+    NoSpaceLeft,
+    Success,
+  };
+
+  struct Success_Body {
+    V0AdvertisementBuilder _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// Cryptographic information about a particular V0 broadcast credential
+/// necessary to LDT-encrypt V0 advertisements.
+struct V0BroadcastCredential {
+  uint8_t key_seed[32];
+  uint8_t metadata_key[14];
+};
+
+/// A `#[repr(C)]` handle to a value of type `V1AdvertisementBuilderInternals`
+struct V1AdvertisementBuilderHandle {
+  uint64_t handle_id;
+};
+
+/// A handle to a builder for V1 advertisements.
+struct V1AdvertisementBuilder {
+  AdvertisementBuilderKind kind;
+  V1AdvertisementBuilderHandle handle;
+};
+
+/// A handle to a builder for V1 sections.
+struct V1SectionBuilder {
+  V1AdvertisementBuilder adv_builder;
+  uint8_t section_index;
+};
+
+/// The result of attempting to create a new V1 section builder.
+struct CreateV1SectionBuilderResult {
+  enum class Tag {
+    Success,
+    UnclosedActiveSection,
+    InvalidAdvertisementBuilderHandle,
+    IdentityKindMismatch,
+    NoSpaceLeft,
+  };
+
+  struct Success_Body {
+    V1SectionBuilder _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// Cryptographic information about a particular V1 broadcast credential
+/// necessary to encrypt V1 MIC-verified and signature-verified sections.
+struct V1BroadcastCredential {
+  uint8_t key_seed[32];
+  uint8_t metadata_key[16];
+  uint8_t private_key[32];
+};
+
+/// The result of attempting to serialize the contents
+/// of a V1 advertisement builder to raw bytes.
+struct SerializeV1AdvertisementResult {
+  enum class Tag {
+    Success,
+    InvalidBuilderState,
+    InvalidAdvertisementBuilderHandle,
+  };
+
+  struct Success_Body {
+    ByteBuffer<250> _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// The result of attempting to create a new V1 advertisement builder.
+struct CreateV1AdvertisementBuilderResult {
+  enum class Tag {
+    NoSpaceLeft,
+    Success,
+  };
+
+  struct Success_Body {
+    V1AdvertisementBuilder _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// The result of attempting to get the derived V1 DE
+/// 16-byte salt for the next-added DE to the section
+/// builder behind the given handle.
+struct NextV1DE16ByteSaltResult {
+  enum class Tag {
+    Error,
+    Success,
+  };
+
+  struct Success_Body {
+    FixedSizeArray<16> _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// Represents the contents of a V1 DE whose payload
+/// is stored in a buffer which may contain up to 127 bytes,
+/// which is the maximum for any V1 DE.
+///
+/// This representation is stable, and so you may directly
+/// reference this struct's fields if you wish.
+struct V1DE127ByteBuffer {
+  /// The DE type code of this generic data-element.
+  uint32_t de_type;
+  /// The raw data-element byte payload, up to
+  /// 127 bytes in length.
+  ByteBuffer<127> payload;
+};
+
+/// Result type for attempting to construct a
+/// Tx Power from a signed byte.
+struct BuildTxPowerResult {
+  enum class Tag {
+    OutOfRange,
+    Success,
+  };
+
+  struct Success_Body {
+    TxPower _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
+/// The result of attempting to set a particular action
+/// bit on some `V0Actions`.
+struct SetV0ActionResult {
+  enum class Tag {
+    Success,
+    Error,
+  };
+
+  struct Success_Body {
+    V0Actions _0;
+  };
+
+  struct Error_Body {
+    V0Actions _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+    Error_Body error;
+  };
+};
+
+/// Representation of a context-sync sequence number.
+struct ContextSyncSeqNum {
+  uint8_t value;
+};
+
+/// Result type for attempting to construct a
+/// ContextSyncSeqNum from an unsigned byte.
+struct BuildContextSyncSeqNumResult {
+  enum class Tag {
+    OutOfRange,
+    Success,
+  };
+
+  struct Success_Body {
+    ContextSyncSeqNum _0;
+  };
+
+  Tag tag;
+  union {
+    Success_Body success;
+  };
+};
+
 } // namespace internal
 } // namespace np_ffi
+
+// clang-format on

diff --git a/nearby/presence/np_c_ffi/rust-toolchain.toml b/nearby/presence/np_c_ffi/rust-toolchain.toml
deleted file mode 100644
index 271800c..0000000
--- a/nearby/presence/np_c_ffi/rust-toolchain.toml
+++ /dev/null

@@ -1,2 +0,0 @@
-[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
index 70949a6..7dc8ac7 100644
--- a/nearby/presence/np_c_ffi/src/credentials.rs
+++ b/nearby/presence/np_c_ffi/src/credentials.rs

@@ -16,9 +16,14 @@
 use crate::{unwrap, PanicReason};
 use core::slice;
 use np_ffi_core::common::*;
-use np_ffi_core::credentials::credential_book::CredentialBook;
-use np_ffi_core::credentials::credential_slab::CredentialSlab;
+use np_ffi_core::credentials::CredentialBook;
+use np_ffi_core::credentials::CredentialSlab;
 use np_ffi_core::credentials::*;
+use np_ffi_core::deserialize::DecryptedMetadata;
+use np_ffi_core::deserialize::{
+    DecryptMetadataResult, DecryptMetadataResultKind, GetMetadataBufferPartsResult,
+    GetMetadataBufferPartsResultKind, MetadataBufferParts,
+};
 use np_ffi_core::utils::FfiEnum;
 
 /// Allocates a new credential-book from the given slab, returning a handle
@@ -122,7 +127,7 @@
 pub extern "C" fn np_ffi_CredentialSlab_add_v0_credential(
     credential_slab: CredentialSlab,
     v0_cred: V0MatchableCredential,
-) -> AddCredentialToSlabResult {
+) -> AddV0CredentialToSlabResult {
     #[allow(unsafe_code)]
     let metadata_slice = unsafe {
         slice::from_raw_parts(
@@ -145,7 +150,7 @@
 pub extern "C" fn np_ffi_CredentialSlab_add_v1_credential(
     credential_slab: CredentialSlab,
     v1_cred: V1MatchableCredential,
-) -> AddCredentialToSlabResult {
+) -> AddV1CredentialToSlabResult {
     #[allow(unsafe_code)]
     let metadata_slice = unsafe {
         slice::from_raw_parts(
@@ -157,3 +162,57 @@
     let matched_credential = MatchedCredential::new(v1_cred.matched_cred.cred_id, metadata_slice);
     credential_slab.add_v1(v1_cred.discovery_cred, matched_credential)
 }
+
+/// Frees the underlying resources of the decrypted metadata buffer
+#[no_mangle]
+pub extern "C" fn np_ffi_deallocate_DecryptedMetadata(
+    metadata: DecryptedMetadata,
+) -> DeallocateResult {
+    metadata.deallocate_metadata()
+}
+
+/// Gets the tag of a `DecryptMetadataResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `DecryptMetadataResult#into_success`.
+#[no_mangle]
+pub extern "C" fn np_ffi_DecryptMetadataResult_kind(
+    result: DecryptMetadataResult,
+) -> DecryptMetadataResultKind {
+    result.kind()
+}
+
+/// Casts a `DecryptMetadataResult` 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_DecryptMetadataResult_into_SUCCESS(
+    result: DecryptMetadataResult,
+) -> DecryptedMetadata {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Gets the pointer and length of the heap allocated byte buffer of decrypted metadata
+#[no_mangle]
+pub extern "C" fn np_ffi_DecryptedMetadata_get_metadata_buffer_parts(
+    metadata: DecryptedMetadata,
+) -> GetMetadataBufferPartsResult {
+    metadata.get_metadata_buffer_parts()
+}
+
+/// Gets the tag of a `GetMetadataBufferPartsResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `GetMetadataBufferPartsResult#into_success`.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetMetadataBufferPartsResult_kind(
+    result: GetMetadataBufferPartsResult,
+) -> GetMetadataBufferPartsResultKind {
+    result.kind()
+}
+
+/// Casts a `GetMetadataBufferPartsResult` to the `Success` variant, panicking in the
+/// case where the passed value is of a different enum variant. This returns the pointer and length
+/// of the byte buffer containing the decrypted metadata.  There can be a data-race between attempts
+/// to access the contents of the buffer and attempts to free the handle from different threads.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetMetadataBufferPartsResult_into_SUCCESS(
+    result: GetMetadataBufferPartsResult,
+) -> MetadataBufferParts {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}

diff --git a/nearby/presence/np_c_ffi/src/deserialize/mod.rs b/nearby/presence/np_c_ffi/src/deserialize/mod.rs
index 9f2cea8..3faf414 100644
--- a/nearby/presence/np_c_ffi/src/deserialize/mod.rs
+++ b/nearby/presence/np_c_ffi/src/deserialize/mod.rs

@@ -14,7 +14,7 @@
 
 use crate::{unwrap, PanicReason};
 use np_ffi_core::common::*;
-use np_ffi_core::credentials::credential_book::CredentialBook;
+use np_ffi_core::credentials::CredentialBook;
 use np_ffi_core::deserialize::v0::*;
 use np_ffi_core::deserialize::v1::*;
 use np_ffi_core::deserialize::*;

diff --git a/nearby/presence/np_c_ffi/src/deserialize/v0.rs b/nearby/presence/np_c_ffi/src/deserialize/v0.rs
index 28bec8a..be68720 100644
--- a/nearby/presence/np_c_ffi/src/deserialize/v0.rs
+++ b/nearby/presence/np_c_ffi/src/deserialize/v0.rs

@@ -12,11 +12,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use crate::{panic, unwrap, PanicReason};
+use crate::{unwrap, PanicReason};
 use np_ffi_core::common::DeallocateResult;
-use np_ffi_core::deserialize::v0::v0_payload::V0Payload;
+use np_ffi_core::deserialize::v0::V0Payload;
 use np_ffi_core::deserialize::v0::*;
+use np_ffi_core::deserialize::DecryptMetadataResult;
 use np_ffi_core::utils::FfiEnum;
+use np_ffi_core::v0::*;
 
 /// Gets the tag of a `DeserializedV0Advertisement` tagged-union.
 #[no_mangle]
@@ -74,6 +76,39 @@
     payload.get_de(index)
 }
 
+/// Attempts to decrypt the metadata for the matched credential for this V0 payload (if any)
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Payload_decrypt_metadata(payload: V0Payload) -> DecryptMetadataResult {
+    payload.decrypt_metadata()
+}
+
+/// Gets the identity details for this V0 payload, or returns an error if this payload does not have
+/// any associated identity (public advertisement)
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Payload_get_identity_details(
+    payload: V0Payload,
+) -> GetV0IdentityDetailsResult {
+    payload.get_identity_details()
+}
+
+/// Gets the tag of a `GetV0IdentityDetailsResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `GetV0IdentityDetailsResult#into_success`.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV0IdentityDetailsResult_kind(
+    result: GetV0IdentityDetailsResult,
+) -> GetV0IdentityDetailsResultKind {
+    result.kind()
+}
+
+/// Casts a `GetV0IdentityDetailsResult` 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_GetV0IdentityDetailsResult_into_SUCCESS(
+    result: GetV0IdentityDetailsResult,
+) -> DeserializedV0IdentityDetails {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
 /// Deallocates any internal data of a `V0Payload`
 #[no_mangle]
 pub extern "C" fn np_ffi_deallocate_v0_payload(payload: V0Payload) -> DeallocateResult {
@@ -92,50 +127,3 @@
 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
index dc682a3..68c0cc2 100644
--- a/nearby/presence/np_c_ffi/src/deserialize/v1.rs
+++ b/nearby/presence/np_c_ffi/src/deserialize/v1.rs

@@ -13,7 +13,9 @@
 // limitations under the License.
 
 use crate::{unwrap, PanicReason};
+use np_ffi_core::common::FixedSizeArray;
 use np_ffi_core::deserialize::v1::*;
+use np_ffi_core::deserialize::DecryptMetadataResult;
 use np_ffi_core::utils::FfiEnum;
 
 /// Gets the number of legible sections on a deserialized V1 advertisement.
@@ -86,29 +88,79 @@
     section.get_de(de_index)
 }
 
+/// Gets the identity details used to decrypt this V1 section, or returns an error if this payload
+/// does not have any associated identity (public advertisement)
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Section_get_identity_details(
+    section: DeserializedV1Section,
+) -> GetV1IdentityDetailsResult {
+    section.get_identity_details()
+}
+
+/// Gets the tag of a `GetV1IdentityDetailsResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `GetV0IdentityDetailsResult#into_success`.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV1IdentityDetailsResult_kind(
+    result: GetV1IdentityDetailsResult,
+) -> GetV1IdentityDetailsResultKind {
+    result.kind()
+}
+
+/// Casts a `GetV1IdentityDetailsResult` 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_GetV1IdentityDetailsResult_into_SUCCESS(
+    result: GetV1IdentityDetailsResult,
+) -> DeserializedV1IdentityDetails {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Attempts to decrypt the metadata for the matched credential for this V0 payload (if any)
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Section_decrypt_metadata(
+    section: DeserializedV1Section,
+) -> DecryptMetadataResult {
+    section.decrypt_metadata()
+}
+
+/// Attempts to derive a 16-byte DE salt for a DE in this section with the given DE offset. This
+/// operation may fail if the passed offset is 255 (causes overflow) or if the section
+/// is leveraging a public identity, and hence, doesn't have an associated salt.
+#[no_mangle]
+pub extern "C" fn np_ffi_DeserializedV1Section_derive_16_byte_salt_for_offset(
+    section: DeserializedV1Section,
+    offset: u8,
+) -> GetV1DE16ByteSaltResult {
+    section.derive_16_byte_salt_for_offset(offset)
+}
+
+/// Gets the tag of a `GetV1DE16ByteSaltResult` tagged-union. On success the wrapped identity
+/// details may be obtained via `GetV1DE16ByteSaltResult#into_success`.
+#[no_mangle]
+pub extern "C" fn np_ffi_GetV1DE16ByteSaltResult_kind(
+    result: GetV1DE16ByteSaltResult,
+) -> GetV1DE16ByteSaltResultKind {
+    result.kind()
+}
+
+/// Casts a `GetV1DE16ByteSaltResult` 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_GetV1DE16ByteSaltResult_into_SUCCESS(
+    result: GetV1DE16ByteSaltResult,
+) -> FixedSizeArray<16> {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
 /// 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
+/// Casts a `GetV1DEResult` 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_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
index 84e9859..2572887 100644
--- a/nearby/presence/np_c_ffi/src/lib.rs
+++ b/nearby/presence/np_c_ffi/src/lib.rs

@@ -16,9 +16,13 @@
 
 pub mod credentials;
 pub mod deserialize;
+pub mod serialize;
+pub mod v0;
+pub mod v1;
 
 use lock_adapter::std::RwLock;
 use lock_adapter::RwLock as _;
+use np_ffi_core::common::InvalidStackDataStructure;
 
 /// Structure for categorized reasons for why a NP C FFI call may
 /// be panicking.
@@ -35,10 +39,14 @@
     /// 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,
+    /// Error returned if the bit representation of a supposedly-Rust-constructed
+    /// -and-validated type actually doesn't correspond to the format of the
+    /// data structure expected on the Rust side of the boundary, and performing
+    /// further operations on the structure would yield unintended behavior.
+    /// If this kind of error is being raised, the C code must
+    /// be messing with stack-allocated data structures for this library
+    /// in an entirely unexpected way.
+    InvalidStackDataStructure = 2,
 }
 
 /// Structure which maintains information about the panic-handler
@@ -87,14 +95,19 @@
     }
 }
 
-//TODO: use a std library RwLock if we have that available, spin is only needed for no_std and
-// won't be as performant
 static PANIC_HANDLER: RwLock<PanicHandler> = RwLock::new(PanicHandler::new());
 
 pub(crate) fn panic(reason: PanicReason) -> ! {
     PANIC_HANDLER.read().panic(reason)
 }
 
+pub(crate) fn panic_if_invalid<T>(value: Result<T, InvalidStackDataStructure>) -> T {
+    match value {
+        Ok(x) => x,
+        Err(_) => panic(PanicReason::InvalidStackDataStructure),
+    }
+}
+
 pub(crate) fn unwrap<T>(value: Option<T>, panic_reason: PanicReason) -> T {
     match value {
         Some(x) => x,
@@ -224,3 +237,47 @@
         max_num_deserialized_v1_advertisements,
     )
 }
+
+/// Sets the maximum number of active handles to v0 advertisement
+/// builders 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 V0 advertisement builder.
+#[no_mangle]
+pub extern "C" fn np_ffi_global_config_set_max_num_v0_advertisement_builders(
+    max_num_v0_advertisement_builders: u32,
+) {
+    np_ffi_core::common::global_config_set_max_num_v0_advertisement_builders(
+        max_num_v0_advertisement_builders,
+    )
+}
+
+/// Sets the maximum number of active handles to v1 advertisement
+/// builders 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 V1 advertisement builder.
+#[no_mangle]
+pub extern "C" fn np_ffi_global_config_set_max_num_v1_advertisement_builders(
+    max_num_v1_advertisement_builders: u32,
+) {
+    np_ffi_core::common::global_config_set_max_num_v1_advertisement_builders(
+        max_num_v1_advertisement_builders,
+    )
+}

diff --git a/nearby/presence/ldt_np_adv_ffi/src/no_std.rs b/nearby/presence/np_c_ffi/src/serialize/mod.rs
similarity index 67%
rename from nearby/presence/ldt_np_adv_ffi/src/no_std.rs
rename to nearby/presence/np_c_ffi/src/serialize/mod.rs
index 524bc3d..da5690a 100644
--- a/nearby/presence/ldt_np_adv_ffi/src/no_std.rs
+++ b/nearby/presence/np_c_ffi/src/serialize/mod.rs

@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// 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.
@@ -11,15 +11,6 @@
 // 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.
-//
-// mod to handle all of the impls needed for no_std
 
-extern crate panic_abort;
-
-use libc_alloc::LibcAlloc;
-
-#[global_allocator]
-static ALLOCATOR: LibcAlloc = LibcAlloc;
-
-#[lang = "eh_personality"]
-extern "C" fn eh_personality() {}
+mod v0;
+mod v1;

diff --git a/nearby/presence/np_c_ffi/src/serialize/v0.rs b/nearby/presence/np_c_ffi/src/serialize/v0.rs
new file mode 100644
index 0000000..962522e
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/serialize/v0.rs

@@ -0,0 +1,107 @@
+// 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 functionality for V0 advertisement serialization.
+
+use crate::{panic_if_invalid, unwrap, PanicReason};
+use np_ffi_core::common::{ByteBuffer, DeallocateResult, EncryptedIdentityType, FixedSizeArray};
+use np_ffi_core::credentials::V0BroadcastCredential;
+use np_ffi_core::serialize::v0::*;
+use np_ffi_core::utils::FfiEnum;
+use np_ffi_core::v0::V0DataElement;
+
+/// Attempts to add the given data element to the V0
+/// advertisement builder behind the passed handle.
+///
+/// This method may invoke the panic handler if the passed DE
+/// has an invalid layout, which may indicate that the backing
+/// data on the stack was somehow tampered with in an unintended way.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0AdvertisementBuilder_add_de(
+    adv_builder: V0AdvertisementBuilder,
+    de: V0DataElement,
+) -> AddV0DEResult {
+    panic_if_invalid(adv_builder.add_de(de))
+}
+
+/// Attempts to serialize the contents of the advertisement builder
+/// behind this handle to bytes. Assuming that the handle is valid,
+/// this operation will always result in the contents behind the
+/// advertisement builder handle being deallocated.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0AdvertisementBuilder_into_advertisement(
+    adv_builder: V0AdvertisementBuilder,
+) -> SerializeV0AdvertisementResult {
+    adv_builder.into_advertisement()
+}
+
+/// Attempts to deallocate the v0 advertisement builder behind
+/// the given handle.
+#[no_mangle]
+pub extern "C" fn np_ffi_deallocate_v0_advertisement_builder(
+    adv_builder: V0AdvertisementBuilder,
+) -> DeallocateResult {
+    adv_builder.deallocate()
+}
+
+/// Gets the tag of a `CreateV0AdvertisementBuilderResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_CreateV0AdvertisementBuilderResult_kind(
+    result: CreateV0AdvertisementBuilderResult,
+) -> CreateV0AdvertisementBuilderResultKind {
+    result.kind()
+}
+
+/// Casts a `CreateV0AdvertisementBuilderResult` 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_CreateV0AdvertisementBuilderResult_into_SUCCESS(
+    result: CreateV0AdvertisementBuilderResult,
+) -> V0AdvertisementBuilder {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Creates a new V0 advertisement builder for a public advertisement.
+#[no_mangle]
+pub extern "C" fn np_ffi_create_v0_public_advertisement_builder(
+) -> CreateV0AdvertisementBuilderResult {
+    create_v0_public_advertisement_builder()
+}
+
+/// Creates a new V0 advertisement builder for an encrypted advertisement.
+#[no_mangle]
+pub extern "C" fn np_ffi_create_v0_encrypted_advertisement_builder(
+    broadcast_cred: V0BroadcastCredential,
+    identity_type: EncryptedIdentityType,
+    salt: FixedSizeArray<2>,
+) -> CreateV0AdvertisementBuilderResult {
+    create_v0_encrypted_advertisement_builder(broadcast_cred, identity_type, salt)
+}
+
+/// Gets the tag of a `SerializeV0AdvertisementResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_SerializeV0AdvertisementResult_kind(
+    result: SerializeV0AdvertisementResult,
+) -> SerializeV0AdvertisementResultKind {
+    result.kind()
+}
+
+/// Casts a `SerializeV0AdvertisementResult` 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_SerializeV0AdvertisementResult_into_SUCCESS(
+    result: SerializeV0AdvertisementResult,
+) -> ByteBuffer<24> {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}

diff --git a/nearby/presence/np_c_ffi/src/serialize/v1.rs b/nearby/presence/np_c_ffi/src/serialize/v1.rs
new file mode 100644
index 0000000..c8ba135
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/serialize/v1.rs

@@ -0,0 +1,183 @@
+// 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 functionality for V1 advertisement serialization.
+
+use crate::{unwrap, PanicReason};
+use np_ffi_core::common::{ByteBuffer, EncryptedIdentityType, FixedSizeArray};
+use np_ffi_core::credentials::V1BroadcastCredential;
+use np_ffi_core::serialize::v1::*;
+use np_ffi_core::serialize::AdvertisementBuilderKind;
+use np_ffi_core::utils::FfiEnum;
+use np_ffi_core::v1::V1VerificationMode;
+
+/// Attempts to create a builder for a new public section within
+/// the advertisement builder behind this handle,
+/// returning a handle to the newly-created section builder if successful.
+///
+/// This method may fail if there is another currently-active
+/// section builder for the same advertisement builder, if the
+/// kind of section being added does not match the advertisement
+/// type (public/encrypted), or if the section would not manage
+/// to fit within the enclosing advertisement.
+#[no_mangle]
+pub extern "C" fn np_ffi_V1AdvertisementBuilder_public_section_builder(
+    adv_builder: V1AdvertisementBuilder,
+) -> CreateV1SectionBuilderResult {
+    adv_builder.public_section_builder()
+}
+
+/// Attempts to create a builder for a new encrypted section within
+/// the advertisement builder behind the given handle,
+/// returning a handle to the newly-created section builder if successful.
+///
+/// The identity details for the new section builder may be specified
+/// via providing the broadcast credential data, the kind of encrypted
+/// identity being broadcast (private/trusted/provisioned), and the
+/// verification mode (MIC/Signature) to be used for the encrypted section.
+///
+/// This method may fail if there is another currently-active
+/// section builder for the same advertisement builder, if the
+/// kind of section being added does not match the advertisement
+/// type (public/encrypted), or if the section would not manage
+/// to fit within the enclosing advertisement.
+#[no_mangle]
+pub extern "C" fn np_ffi_V1AdvertisementBuilder_encrypted_section_builder(
+    adv_builder: V1AdvertisementBuilder,
+    broadcast_cred: V1BroadcastCredential,
+    identity_type: EncryptedIdentityType,
+    verification_mode: V1VerificationMode,
+) -> CreateV1SectionBuilderResult {
+    adv_builder.encrypted_section_builder(broadcast_cred, identity_type, verification_mode)
+}
+
+/// Attempts to serialize the contents of the advertisement builder
+/// behind this handle to bytes. Assuming that the handle is valid,
+/// this operation will always result in the contents behind the
+/// advertisement builder handle being deallocated.
+#[no_mangle]
+pub extern "C" fn np_ffi_V1AdvertisementBuilder_into_advertisement(
+    adv_builder: V1AdvertisementBuilder,
+) -> SerializeV1AdvertisementResult {
+    adv_builder.into_advertisement()
+}
+
+/// Gets the tag of a `CreateV1AdvertisementBuilderResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_CreateV1AdvertisementBuilderResult_kind(
+    result: CreateV1AdvertisementBuilderResult,
+) -> CreateV1AdvertisementBuilderResultKind {
+    result.kind()
+}
+
+/// Casts a `CreateV1AdvertisementBuilderResult` 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_CreateV1AdvertisementBuilderResult_into_SUCCESS(
+    result: CreateV1AdvertisementBuilderResult,
+) -> V1AdvertisementBuilder {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Creates a new V1 advertisement builder for the given advertisement
+/// kind (public/encrypted).
+#[no_mangle]
+pub extern "C" fn np_ffi_create_v1_advertisement_builder(
+    kind: AdvertisementBuilderKind,
+) -> CreateV1AdvertisementBuilderResult {
+    create_v1_advertisement_builder(kind)
+}
+
+/// Gets the tag of a `SerializeV1AdvertisementResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_SerializeV1AdvertisementResult_kind(
+    result: SerializeV1AdvertisementResult,
+) -> SerializeV1AdvertisementResultKind {
+    result.kind()
+}
+
+/// Casts a `SerializeV1AdvertisementResult` 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_SerializeV1AdvertisementResult_into_SUCCESS(
+    result: SerializeV1AdvertisementResult,
+) -> ByteBuffer<250> {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Gets the tag of a `CreateV1SectionBuilderResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_CreateV1SectionBuilderResult_kind(
+    result: CreateV1SectionBuilderResult,
+) -> CreateV1SectionBuilderResultKind {
+    result.kind()
+}
+
+/// Casts a `CreateV1SectionBuilderResult` 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_CreateV1SectionBuilderResult_into_SUCCESS(
+    result: CreateV1SectionBuilderResult,
+) -> V1SectionBuilder {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Gets the tag of a `NextV1DE16ByteSaltResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_NextV1DE16ByteSaltResult_kind(
+    result: NextV1DE16ByteSaltResult,
+) -> NextV1DE16ByteSaltResultKind {
+    result.kind()
+}
+
+/// Casts a `NextV1DE16ByteSaltResult` 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_NextV1DE16ByteSaltResult_into_SUCCESS(
+    result: NextV1DE16ByteSaltResult,
+) -> FixedSizeArray<16> {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Adds the section constructed behind the given handle to
+/// a section builder to the containing advertisement it originated from.
+/// After this call, the section builder handle will become invalid.
+#[no_mangle]
+pub extern "C" fn np_ffi_V1SectionBuilder_add_to_advertisement(
+    section_builder: V1SectionBuilder,
+) -> AddV1SectionToAdvertisementResult {
+    section_builder.add_to_advertisement()
+}
+
+/// Attempts to get the derived 16-byte V1 DE salt for the next
+/// DE to be added to the passed section builder. May fail if this
+/// section builder handle is invalid, or if the section
+/// is a public section.
+#[no_mangle]
+pub extern "C" fn np_ffi_V1SectionBuilder_next_de_salt(
+    section_builder: V1SectionBuilder,
+) -> NextV1DE16ByteSaltResult {
+    section_builder.next_de_salt()
+}
+
+/// Attempts to add the given DE to the section builder behind
+/// this handle. The passed DE may have a payload of up to 127
+/// bytes, the maximum for a V1 DE.
+#[no_mangle]
+pub extern "C" fn np_ffi_V1SectionBuilder_add_127_byte_buffer_de(
+    section_builder: V1SectionBuilder,
+    de: V1DE127ByteBuffer,
+) -> AddV1DEResult {
+    section_builder.add_127_byte_buffer_de(de)
+}

diff --git a/nearby/presence/np_c_ffi/src/v0.rs b/nearby/presence/np_c_ffi/src/v0.rs
new file mode 100644
index 0000000..17302aa
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/v0.rs

@@ -0,0 +1,195 @@
+// 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 functionality common to V0 ser/deser flows.
+
+use crate::{panic, panic_if_invalid, unwrap, PanicReason};
+use np_ffi_core::serialize::AdvertisementBuilderKind;
+use np_ffi_core::utils::FfiEnum;
+use np_ffi_core::v0::*;
+
+/// 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)
+}
+
+/// Upcasts a Tx power DE to a generic V0 data-element.
+#[no_mangle]
+pub extern "C" fn np_ffi_TxPower_into_V0DataElement(tx_power: TxPower) -> V0DataElement {
+    V0DataElement::TxPower(tx_power)
+}
+
+/// 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)
+}
+
+/// Upcasts a V0 actions DE to a generic V0 data-element.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Actions_into_V0DataElement(actions: V0Actions) -> V0DataElement {
+    V0DataElement::Actions(actions)
+}
+
+/// Gets the tag of a `BuildTxPowerResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_BuildTxPowerResult_kind(
+    result: BuildTxPowerResult,
+) -> BuildTxPowerResultKind {
+    result.kind()
+}
+
+/// Casts a `BuildTxPowerResult` 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_BuildTxPowerResult_into_SUCCESS(result: BuildTxPowerResult) -> TxPower {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Attempts to construct a new TxPower from
+/// the given signed-byte value.
+#[no_mangle]
+pub extern "C" fn np_ffi_TxPower_build_from_signed_byte(tx_power: i8) -> BuildTxPowerResult {
+    TxPower::build_from_signed_byte(tx_power)
+}
+
+/// Gets the value of the given TxPower as a signed byte.
+#[no_mangle]
+pub extern "C" fn np_ffi_TxPower_as_signed_byte(tx_power: TxPower) -> i8 {
+    tx_power.as_i8()
+}
+
+/// Gets the discriminant of the `SetV0ActionResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_SetV0ActionResult_kind(
+    result: SetV0ActionResult,
+) -> SetV0ActionResultKind {
+    result.kind()
+}
+
+/// Attempts to cast a `SetV0ActionResult` tagged-union into the `Success` variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_SetV0ActionResult_into_SUCCESS(result: SetV0ActionResult) -> V0Actions {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Attempts to cast a `SetV0ActionResult` tagged-union into the `Error` variant.
+#[no_mangle]
+pub extern "C" fn np_ffi_SetV0ActionResult_into_ERROR(result: SetV0ActionResult) -> V0Actions {
+    unwrap(result.into_error(), PanicReason::EnumCastFailed)
+}
+
+/// Constructs a new V0 actions DE with no declared boolean
+/// actions and a zeroed context sync sequence number,
+/// where the DE is intended for the given advertisement
+/// kind (plaintext/encrypted).
+#[no_mangle]
+pub extern "C" fn np_ffi_build_new_zeroed_V0Actions(kind: AdvertisementBuilderKind) -> V0Actions {
+    V0Actions::new_zeroed(kind)
+}
+
+/// 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::InvalidStackDataStructure),
+    }
+}
+
+/// 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,
+) -> ContextSyncSeqNum {
+    match actions.get_context_sync_seq_num() {
+        Ok(b) => b,
+        Err(_) => panic(PanicReason::InvalidStackDataStructure),
+    }
+}
+
+/// Attempts to set the given action bit to the given boolean value.
+/// This operation may fail if the requested action bit may not be
+/// set for the kind of containing advertisement (public/encrypted)
+/// that this action DE is intended to belong to. In this case,
+/// the original action bits will be yielded back to the caller,
+/// unaltered.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Actions_set_action(
+    actions: V0Actions,
+    action_type: BooleanActionType,
+    value: bool,
+) -> SetV0ActionResult {
+    panic_if_invalid(actions.set_action(action_type, value))
+}
+
+/// Sets the context sequence number for the given Actions DE.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Actions_set_context_sync_sequence_number(
+    actions: V0Actions,
+    value: ContextSyncSeqNum,
+) -> V0Actions {
+    panic_if_invalid(actions.set_context_sync_seq_num(value))
+}
+
+/// Returns the representation of the passed `V0Actions` as an unsigned
+/// integer, where the bit-positions correspond to individual actions.
+#[no_mangle]
+pub extern "C" fn np_ffi_V0Actions_as_u32(actions: V0Actions) -> u32 {
+    actions.as_u32()
+}
+
+/// Gets the tag of a `BuildContextSyncSeqNumResult` tagged-union.
+#[no_mangle]
+pub extern "C" fn np_ffi_BuildContextSyncSeqNumResult_kind(
+    result: BuildContextSyncSeqNumResult,
+) -> BuildContextSyncSeqNumResultKind {
+    result.kind()
+}
+
+/// Casts a `BuildContextSyncSeqNumResult` 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_BuildContextSyncSeqNumResult_into_SUCCESS(
+    result: BuildContextSyncSeqNumResult,
+) -> ContextSyncSeqNum {
+    unwrap(result.into_success(), PanicReason::EnumCastFailed)
+}
+
+/// Attempts to build a new context sync sequence number
+/// from the given unsigned byte.
+#[no_mangle]
+pub extern "C" fn np_ffi_ContextSyncSeqNum_build_from_unsigned_byte(
+    value: u8,
+) -> BuildContextSyncSeqNumResult {
+    ContextSyncSeqNum::build_from_unsigned_byte(value)
+}
+
+/// Gets the value of the given context-sync sequence number as an unsigned byte.
+#[no_mangle]
+pub extern "C" fn np_ffi_ContextSyncSeqNum_as_unsigned_byte(seq_num: ContextSyncSeqNum) -> u8 {
+    seq_num.as_u8()
+}

diff --git a/nearby/presence/np_c_ffi/src/v1.rs b/nearby/presence/np_c_ffi/src/v1.rs
new file mode 100644
index 0000000..87a168e
--- /dev/null
+++ b/nearby/presence/np_c_ffi/src/v1.rs

@@ -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.
+
+//! NP Rust C FFI functionality common to V1 ser/deser flows.
+
+use np_ffi_core::deserialize::v1::*;
+
+/// 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_cpp_ffi/CMakeLists.txt b/nearby/presence/np_cpp_ffi/CMakeLists.txt
index 27c9132..7071bbd 100644
--- a/nearby/presence/np_cpp_ffi/CMakeLists.txt
+++ b/nearby/presence/np_cpp_ffi/CMakeLists.txt

@@ -12,14 +12,10 @@
 # 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${CMAKE_STATIC_LIBRARY_SUFFIX}"
+        "${NEARBY_ROOT}/target/release/${CMAKE_STATIC_LIBRARY_PREFIX}np_c_ffi${CMAKE_STATIC_LIBRARY_SUFFIX}"
         absl::statusor)
 
 target_include_directories(nearby_protocol PUBLIC
@@ -38,11 +34,12 @@
 target_link_libraries(shared_test_util nearby_protocol absl::statusor)
 
 if (ENABLE_TESTS)
-    message(STATUS "Enabling np_cpp tests")
+    message(STATUS "Enabling np_ffi tests")
     add_subdirectory(tests)
     add_subdirectory(benchmarks)
 endif ()
 
 if (ENABLE_FUZZ)
+    message(STATUS "Enabling np_ffi fuzzers")
     add_subdirectory(fuzz)
 endif ()

diff --git a/nearby/presence/np_cpp_ffi/benchmarks/CMakeLists.txt b/nearby/presence/np_cpp_ffi/benchmarks/CMakeLists.txt
index c7d8343..c3c059a 100644
--- a/nearby/presence/np_cpp_ffi/benchmarks/CMakeLists.txt
+++ b/nearby/presence/np_cpp_ffi/benchmarks/CMakeLists.txt

@@ -12,11 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-add_executable(np_ffi_bench np_ffi_bench.cc)
+add_executable(
+        np_ffi_bench
+        np_cpp_benches.cc
+        np_c_ffi_benches.cc)
 
 target_link_libraries(
         np_ffi_bench
         nearby_protocol
+        shared_test_util
         benchmark::benchmark)
 
 if (UNIX)

diff --git a/nearby/presence/np_cpp_ffi/benchmarks/np_c_ffi_benches.cc b/nearby/presence/np_cpp_ffi/benchmarks/np_c_ffi_benches.cc
new file mode 100644
index 0000000..02bd4ca
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/benchmarks/np_c_ffi_benches.cc

@@ -0,0 +1,64 @@
+// 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.
+
+// Benchmarks measuring the performance of the pure autogenerated C API.
+// This is useful to compare with the C++ benchmarks to understand the overhead
+// incurred by going through the C++ wrapper types instead of directly calling
+// the C API.
+
+#include "benchmark/benchmark.h"
+#include "np_cpp_ffi_functions.h"
+#include "np_cpp_ffi_types.h"
+#include "shared_test_util.h"
+
+void V0PlaintextCApi(benchmark::State &state) {
+  auto num_ciphers = state.range(0);
+  auto slab_result = np_ffi::internal::np_ffi_create_credential_slab();
+  assert(
+      np_ffi::internal::np_ffi_CreateCredentialSlabResult_kind(slab_result) ==
+      np_ffi::internal::CreateCredentialSlabResultKind::Success);
+  auto slab = np_ffi::internal::np_ffi_CreateCredentialSlabResult_into_SUCCESS(
+      slab_result);
+
+  auto book_result =
+      np_ffi::internal::np_ffi_create_credential_book_from_slab(slab);
+  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(
+          {V0AdvMultiDeInternals}, book);
+      assert(np_ffi::internal::np_ffi_DeserializeAdvertisementResult_kind(
+                 result) ==
+             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+      [[maybe_unused]] auto deallocate_result =
+          np_ffi::internal::np_ffi_deallocate_deserialize_advertisement_result(
+              result);
+      assert(deallocate_result == np_ffi::internal::DeallocateResult::Success);
+    }
+  }
+
+  [[maybe_unused]] auto deallocate_result =
+      np_ffi::internal::np_ffi_deallocate_credential_book(book);
+  assert(deallocate_result == np_ffi::internal::DeallocateResult::Success);
+}
+
+BENCHMARK(V0PlaintextCApi)
+    ->RangeMultiplier(10)
+    ->Range(1, 1000)
+    ->Unit(benchmark::kMicrosecond);

diff --git a/nearby/presence/np_cpp_ffi/benchmarks/np_cpp_benches.cc b/nearby/presence/np_cpp_ffi/benchmarks/np_cpp_benches.cc
new file mode 100644
index 0000000..2a3b010
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/benchmarks/np_cpp_benches.cc

@@ -0,0 +1,229 @@
+// 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"
+
+// needed for running directly against the C API (ie: bypassing the C++ wrapper)
+#include "np_cpp_ffi_functions.h"
+#include "np_cpp_ffi_types.h"
+
+#include "benchmark/benchmark.h"
+
+nearby_protocol::CredentialBook CreateEmptyCredBook() {
+  auto cred_slab = nearby_protocol::CredentialSlab::TryCreate();
+  assert(cred_slab.ok());
+  auto cred_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(cred_slab.value());
+  assert(cred_book.ok());
+  return std::move(*cred_book);
+}
+
+void V0Plaintext(benchmark::State &state) {
+  auto cred_book = CreateEmptyCredBook();
+  auto num_advs = state.range(0);
+  for ([[maybe_unused]] auto _ : state) {
+    for (int i = 0; i < num_advs; i++) {
+      auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvPlaintextMultiDe, cred_book);
+      assert(result.GetKind() ==
+             nearby_protocol::DeserializeAdvertisementResultKind::V0);
+    }
+  }
+}
+BENCHMARK(V0Plaintext)
+    ->RangeMultiplier(10)
+    ->Range(1, 1000)
+    ->Unit(benchmark::kMicrosecond);
+
+void V1Plaintext(benchmark::State &state) {
+  auto cred_book = CreateEmptyCredBook();
+  auto num_advs = state.range(0);
+  for ([[maybe_unused]] auto _ : state) {
+    for (int i = 0; i < num_advs; i++) {
+      auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V1AdvPlaintext, cred_book);
+      assert(result.GetKind() ==
+             nearby_protocol::DeserializeAdvertisementResultKind::V1);
+    }
+  }
+}
+BENCHMARK(V1Plaintext)
+    ->RangeMultiplier(10)
+    ->Range(1, 1000)
+    ->Unit(benchmark::kMicrosecond);
+
+class V0Encrypted : public benchmark::Fixture {
+public:
+  std::optional<nearby_protocol::CredentialBook> cred_book_;
+  void SetUp(const ::benchmark::State &state) override {
+    // populate credential book
+    auto num_creds = state.range(0);
+
+    auto slab = nearby_protocol::CredentialSlab::TryCreate();
+    assert(slab.ok());
+
+    for (int i = 1; i < num_creds; i++) {
+      auto credential = GenerateRandomCredentialV0();
+      auto result = slab->AddV0Credential(credential);
+      assert(result.ok());
+    }
+
+    // now at the end of the list add the matching credential
+    nearby_protocol::MatchedCredentialData match_data(123,
+                                                      V0AdvEncryptedMetadata);
+    std::array<uint8_t, 32> key_seed = {};
+    std::fill_n(key_seed.begin(), 32, 0x11);
+    nearby_protocol::V0MatchableCredential v0_cred(
+        key_seed, V0AdvLegacyMetadataKeyHmac, match_data);
+    auto add_result = slab->AddV0Credential(v0_cred);
+    assert(add_result.ok());
+
+    auto cred_book = nearby_protocol::CredentialBook::TryCreateFromSlab(*slab);
+    assert(cred_book.ok());
+    cred_book_ = std::move(*cred_book);
+  }
+  void TearDown(const ::benchmark::State &state) override {}
+};
+
+BENCHMARK_DEFINE_F(V0Encrypted, SingleMatchingCredential)
+(benchmark::State &state) {
+  for ([[maybe_unused]] auto _ : state) {
+    // now that the credentials have been  loaded attempt to deserialize
+    auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+        V0AdvEncryptedPayload, cred_book_.value());
+    benchmark::DoNotOptimize(result);
+
+    // make sure this succeeded and that we could correctly decrypt the adv
+    assert(result.GetKind() ==
+           nearby_protocol::DeserializeAdvertisementResultKind::V0);
+    assert(result.IntoV0().IntoLegible().GetIdentityKind() ==
+           nearby_protocol::DeserializedV0IdentityKind::Decrypted);
+  }
+}
+
+BENCHMARK_REGISTER_F(V0Encrypted, SingleMatchingCredential)
+    ->RangeMultiplier(10)
+    ->Range(1, 1000)
+    ->Unit(benchmark::kMicrosecond);
+
+class V1SigEncryptedSingleSection : public benchmark::Fixture {
+public:
+  std::optional<nearby_protocol::CredentialBook> cred_book_;
+  void SetUp(const ::benchmark::State &state) override {
+    // populate credential book
+    auto num_creds = state.range(0);
+    auto slab = nearby_protocol::CredentialSlab::TryCreate();
+    assert(slab.ok());
+    for (int i = 1; i < num_creds; i++) {
+      auto credential = GenerateRandomCredentialV1();
+      auto result = slab->AddV1Credential(credential);
+      assert(result.ok());
+    }
+    // now at the end of the list add the matching credential
+    nearby_protocol::MatchedCredentialData match_data(123,
+                                                      V1AdvEncryptedMetadata);
+    nearby_protocol::V1MatchableCredential v1_cred(
+        V1AdvKeySeed, V1AdvExpectedUnsignedMetadataKeyHmac,
+        V1AdvExpectedSignedMetadataKeyHmac, V1AdvPublicKey, match_data);
+    auto add_result = slab->AddV1Credential(v1_cred);
+    assert(add_result.ok());
+    auto cred_book = nearby_protocol::CredentialBook::TryCreateFromSlab(*slab);
+    assert(cred_book.ok());
+    cred_book_ = std::move(*cred_book);
+  }
+  void TearDown(const ::benchmark::State &state) override {}
+};
+
+BENCHMARK_DEFINE_F(V1SigEncryptedSingleSection, SingleMatchingCredential)
+(benchmark::State &state) {
+  for ([[maybe_unused]] auto _ : state) {
+    // now that the credentials have been  loaded attempt to deserialize
+    auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
+        V1AdvEncrypted, cred_book_.value());
+    benchmark::DoNotOptimize(result);
+
+    // make sure this succeeded and that we could correctly decrypt the adv
+    assert(result.GetKind() ==
+           nearby_protocol::DeserializeAdvertisementResultKind::V1);
+    assert(result.IntoV1().GetNumLegibleSections() == 1);
+  }
+}
+
+BENCHMARK_REGISTER_F(V1SigEncryptedSingleSection, SingleMatchingCredential)
+    ->RangeMultiplier(10)
+    ->Range(1, 1000)
+    ->Unit(benchmark::kMicrosecond);
+
+struct V1CredentialData {
+  uint32_t cred_id;
+  std::array<uint8_t, 32> key_seed;
+  std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac;
+  std::array<uint8_t, 32> expected_signed_metadata_key_hmac;
+  std::array<uint8_t, 32> pub_key;
+  std::array<uint8_t, 500> encrypted_metadata_bytes;
+};
+
+V1CredentialData GenerateData() {
+  return {
+      .cred_id = static_cast<uint32_t>(rand()),
+      .key_seed = create_random_array<32>(),
+      .expected_unsigned_metadata_key_hmac = create_random_array<32>(),
+      .expected_signed_metadata_key_hmac = create_random_array<32>(),
+      .pub_key = create_random_array<32>(),
+      .encrypted_metadata_bytes = create_random_array<500>(),
+  };
+}
+
+class LoadCredentialBook : public benchmark::Fixture {
+public:
+  std::vector<V1CredentialData> creds_;
+  // generate all the data in setup so the time for generation is not included
+  // in the measurement
+  void SetUp(const ::benchmark::State &state) override {
+    // populate credential book
+    auto num_creds = state.range(0);
+    for (int i = 1; i < num_creds; i++) {
+      auto credential = GenerateData();
+      creds_.push_back(credential);
+    }
+  }
+};
+
+BENCHMARK_DEFINE_F(LoadCredentialBook, SingleMatchingCredential)
+(benchmark::State &state) {
+  for ([[maybe_unused]] auto _ : state) {
+    auto slab = nearby_protocol::CredentialSlab::TryCreate();
+    assert(slab.ok());
+    for (auto cred : creds_) {
+      nearby_protocol::MatchedCredentialData m(cred.cred_id,
+                                               cred.encrypted_metadata_bytes);
+      nearby_protocol::V1MatchableCredential v1_cred(
+          cred.key_seed, cred.expected_unsigned_metadata_key_hmac,
+          cred.expected_signed_metadata_key_hmac, cred.pub_key, m);
+      auto result = slab->AddV1Credential(v1_cred);
+      assert(result.ok());
+    }
+    auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(*slab);
+    assert(book.ok());
+    benchmark::DoNotOptimize(book);
+  }
+}
+
+BENCHMARK_REGISTER_F(LoadCredentialBook, SingleMatchingCredential)
+    ->RangeMultiplier(10)
+    ->Range(1, 1000)
+    ->Unit(benchmark::kMicrosecond);
+
+BENCHMARK_MAIN();

diff --git a/nearby/presence/np_cpp_ffi/benchmarks/np_ffi_bench.cc b/nearby/presence/np_cpp_ffi/benchmarks/np_ffi_bench.cc
deleted file mode 100644
index 164bab3..0000000
--- a/nearby/presence/np_cpp_ffi/benchmarks/np_ffi_bench.cc
+++ /dev/null

@@ -1,111 +0,0 @@
-// 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_slab = nearby_protocol::CredentialSlab::TryCreate();
-  assert(cred_slab.ok());
-  auto cred_book = nearby_protocol::CredentialBook::TryCreateFromSlab(cred_slab.value());
-  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 slab_result = np_ffi::internal::np_ffi_create_credential_slab();
-  assert(
-      np_ffi::internal::np_ffi_CreateCredentialSlabResult_kind(slab_result) ==
-      np_ffi::internal::CreateCredentialSlabResultKind::Success);
-  auto slab = np_ffi::internal::np_ffi_CreateCredentialSlabResult_into_SUCCESS(
-      slab_result);
-
-  auto book_result = np_ffi::internal::np_ffi_create_credential_book_from_slab(slab);
-  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();

diff --git a/nearby/presence/np_cpp_ffi/fuzz/CMakeLists.txt b/nearby/presence/np_cpp_ffi/fuzz/CMakeLists.txt
index 0a1c088..e9decf3 100644
--- a/nearby/presence/np_cpp_ffi/fuzz/CMakeLists.txt
+++ b/nearby/presence/np_cpp_ffi/fuzz/CMakeLists.txt

@@ -12,21 +12,19 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.0)
+fuzztest_setup_fuzzing_flags()
 
-# libfuzzer needs clang
-SET(CMAKE_C_COMPILER "clang")
-SET(CMAKE_CXX_COMPILER "clang++")
+add_executable(
+        deserialization_fuzzer
+        deserialization_fuzzer.cc
+)
 
-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)
+target_link_libraries(
+        deserialization_fuzzer
+        PRIVATE
+        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)
+link_fuzztest(deserialization_fuzzer)
+gtest_discover_tests(deserialization_fuzzer)

diff --git a/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvEmpty b/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvEmpty
deleted file mode 100644
index f76dd23..0000000
--- a/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvEmpty
+++ /dev/null
Binary files differ

diff --git a/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvSimple b/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvSimple
deleted file mode 100644
index fac97f6..0000000
--- a/nearby/presence/np_cpp_ffi/fuzz/corpus/V0AdvSimple
+++ /dev/null
Binary files differ

diff --git a/nearby/presence/np_cpp_ffi/fuzz/corpus/V1AdvSimple b/nearby/presence/np_cpp_ffi/fuzz/corpus/V1AdvSimple
deleted file mode 100644
index 4acdf33..0000000
--- a/nearby/presence/np_cpp_ffi/fuzz/corpus/V1AdvSimple
+++ /dev/null

@@ -1 +0,0 @@
- 
\ No newline at end of file

diff --git a/nearby/presence/np_cpp_ffi/fuzz/deserialization_fuzzer.cc b/nearby/presence/np_cpp_ffi/fuzz/deserialization_fuzzer.cc
new file mode 100644
index 0000000..d18b83e
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/fuzz/deserialization_fuzzer.cc

@@ -0,0 +1,307 @@
+// Copyright 2024 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 <array>
+#include <cstdint>
+#include <random>
+#include <span>
+#include <utility>
+#include <vector>
+
+#include "fuzztest/domain_core.h"
+#include "fuzztest/fuzztest.h"
+#include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "shared_test_util.h"
+
+// redefine test data as std::vector types since fuzztest does not support
+// template class use in its input domains (ie: std::array<T, N>), and we want
+// to use our test data to seed the fuzzer
+static std::vector<uint8_t> V0AdvEmptyVec(V0AdvEmptyBytes.begin(),
+                                          V0AdvEmptyBytes.end());
+static std::vector<uint8_t> V1AdvEmptyVec(V1AdvEmptyBytes.begin(),
+                                          V1AdvEmptyBytes.end());
+static std::vector<uint8_t> V0AdvPlaintextVec(V0AdvPlaintextBytes.begin(),
+                                              V0AdvPlaintextBytes.end());
+static std::vector<uint8_t> V0AdvPlaintextMultiDeVec(
+    V0AdvPlaintextMultiDeBytes.begin(), V0AdvPlaintextMultiDeBytes.end());
+static std::vector<uint8_t> V1AdvPlaintextVec(V1AdvPlaintextBytes.begin(),
+                                              V1AdvPlaintextBytes.end());
+static std::vector<uint8_t> V0AdvEncryptedVec(V0AdvEncryptedBytes.begin(),
+                                              V0AdvEncryptedBytes.end());
+static std::vector<uint8_t> V1AdvEncryptedVec(V1AdvEncryptedBytes.begin(),
+                                              V1AdvEncryptedBytes.end());
+
+void HandleAdvertisementResult(nearby_protocol::DeserializeAdvertisementResult);
+
+void PlaintextDeserializer(std::span<const uint8_t> adv_bytes) {
+  auto slab = nearby_protocol::CredentialSlab::TryCreate();
+  EXPECT_TRUE(slab.ok());
+  auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(*slab);
+  EXPECT_TRUE(book.ok());
+  auto buffer = nearby_protocol::ByteBuffer<255>::TryFromSpan(adv_bytes);
+  EXPECT_TRUE(buffer.ok());
+
+  nearby_protocol::RawAdvertisementPayload payload(
+      (nearby_protocol::ByteBuffer<255>(*buffer)));
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(payload, *book);
+
+  // Since we are seeding with valid data, we can add extra calls into the
+  // result processing APIs to ensure none of the internal asserts are
+  // triggered.
+  HandleAdvertisementResult(std::move(deserialize_result));
+}
+
+FUZZ_TEST(NpCppDeserializationFuzzers, PlaintextDeserializer)
+    .WithDomains(fuzztest::Arbitrary<std::vector<uint8_t>>()
+                     .WithMinSize(0)
+                     .WithMaxSize(255))
+    .WithSeeds({V0AdvEmptyVec, V1AdvEmptyVec, V0AdvPlaintextVec,
+                V0AdvPlaintextMultiDeVec, V1AdvPlaintextVec, V0AdvEncryptedVec,
+                V1AdvEncryptedVec});
+
+// The data which is automatically generated by the fuzzer
+struct IdentityData {
+  uint32_t credential_id;
+  std::array<uint8_t, 32> key_seed;
+  std::array<uint8_t, 32> legacy_metadata_key_hmac;
+  std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac;
+  std::array<uint8_t, 32> expected_signed_metadata_key_hmac;
+  std::array<uint8_t, 32> pub_key;
+  std::vector<uint8_t> encrypted_metadata_bytes;
+};
+
+static struct IdentityData V0TestCaseIdentityData {
+  .credential_id = static_cast<uint32_t>(rand()), .key_seed = V0AdvKeySeed,
+  .legacy_metadata_key_hmac = V0AdvLegacyMetadataKeyHmac,
+  .encrypted_metadata_bytes = V0AdvEncryptedMetadata
+};
+
+static struct IdentityData V1TestCaseIdentityData {
+  .credential_id = static_cast<uint32_t>(rand()), .key_seed = V1AdvKeySeed,
+  .expected_unsigned_metadata_key_hmac = V1AdvExpectedUnsignedMetadataKeyHmac,
+  .expected_signed_metadata_key_hmac = V1AdvExpectedSignedMetadataKeyHmac,
+  .pub_key = V1AdvPublicKey, .encrypted_metadata_bytes = V1AdvEncryptedMetadata,
+};
+
+// Now lets try feeding the fuzzer some credential data that can successfully
+// decrypt advertisements to improve its efficiency, and provide extra coverage
+// on on credential/iteration code paths.
+// TODO: Add more interesting credential seed data once we have C++
+// serialization APIs, ie multiple sections with multiple valid credentials
+// and combinations of matching and undecryptable sections etc.
+void DeserializeWithCredentials(std::span<const IdentityData> identities,
+                                std::span<const uint8_t> adv_bytes) {
+  auto slab = nearby_protocol::CredentialSlab::TryCreate();
+  EXPECT_TRUE(slab.ok());
+
+  // populate book with fuzzer generated credential data
+  for (auto data : identities) {
+    nearby_protocol::MatchedCredentialData match_data(
+        123, data.encrypted_metadata_bytes);
+    nearby_protocol::V0MatchableCredential v0_cred(
+        data.key_seed, data.legacy_metadata_key_hmac, match_data);
+    // adding v0 credentials is infallible
+    EXPECT_TRUE(slab->AddV0Credential(v0_cred).ok());
+
+    nearby_protocol::V1MatchableCredential v1_cred(
+        data.key_seed, data.expected_unsigned_metadata_key_hmac,
+        data.expected_signed_metadata_key_hmac, data.pub_key, match_data);
+    [[maybe_unused]] auto result = slab->AddV1Credential(v1_cred);
+  }
+
+  auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(*slab);
+  EXPECT_TRUE(book.ok());
+  auto buffer = nearby_protocol::ByteBuffer<255>::TryFromSpan(adv_bytes);
+  EXPECT_TRUE(buffer.ok());
+
+  nearby_protocol::RawAdvertisementPayload payload(
+      (nearby_protocol::ByteBuffer<255>(*buffer)));
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(payload, *book);
+
+  // Since we are seeding with valid data, we can add extra calls into the
+  // result processing APIs to ensure none of the internal asserts are
+  // triggered.
+  HandleAdvertisementResult(std::move(deserialize_result));
+}
+
+std::vector<std::tuple<std::vector<IdentityData>, std::vector<uint8_t>>>
+DeserializeWithCredentialSeedData() {
+  return {
+      {{{V0TestCaseIdentityData, V1TestCaseIdentityData}, V0AdvEncryptedVec},
+       {{V0TestCaseIdentityData, V1TestCaseIdentityData}, V1AdvEncryptedVec}},
+  };
+}
+
+TEST(NpCppDeserializationFuzzers, InvalidPublicKeyInCredential) {
+  std::vector<IdentityData> identities;
+  identities.push_back(
+      {1804289383,
+       {17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
+        17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17},
+       {136, 51,  222, 213, 77,  0,   146, 232, 128, 112, 213,
+        31,  24,  236, 34,  69,  117, 124, 36,  223, 227, 140,
+        178, 222, 119, 182, 120, 133, 252, 165, 103, 77},
+       {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+       {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+       {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+       fuzztest::ToByteArray("")});
+  identities.push_back({846930886,
+                        {49, 67, 99, 30,  202, 232, 151, 75,  150, 80,  204,
+                         28, 72, 37, 14,  129, 88,  6,   129, 81,  249, 235,
+                         37, 35, 3,  212, 151, 109, 149, 25,  145, 57},
+                        {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+                        {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+                        {28,  188, 235, 220, 23,  181, 145, 229, 7,   157, 112,
+                         193, 232, 75,  204, 219, 75,  15,  118, 131, 89,  98,
+                         10,  45,  85,  11,  59,  54,  164, 146, 139, 19},
+                        {109, 13,  182, 9,   16,  177, 83,  196, 126, 16,  22,
+                         20,  156, 159, 242, 20,  15,  236, 83,  118, 227, 7,
+                         217, 211, 158, 174, 231, 69,  44,  3,   236, 109},
+                        fuzztest::ToByteArray("")});
+
+  DeserializeWithCredentials(
+      identities,
+      fuzztest::ToByteArray(
+          " g\221\020\010\255iF\004]"
+          "\256m\267\367\\\323\270\254\360\277u\220\001\276s3\244v\204J\t"
+          "\017+"
+          "\231G\337\213F\312\026\316\023\265nS\256("
+          "VD\016\246\215\353\241\021\257N\033\340\216\365\272\220O."
+          "\224\374\336\246\177]"
+          "\3107\265\357\312\254\213\237\033\324\306\021\205\323g92\321\202"
+          "\312"
+          "N\271F\003\203hV\013\314\375z*\276\007"));
+}
+
+TEST(NpCppDeserializationFuzzers, PlaintextDeserializerRegression) {
+  PlaintextDeserializer(fuzztest::ToByteArray(
+      " 4\221\020\005\255iF\004]"
+      "\256\275m\267\367\\\270\254\360\277u\220\001G\337\213F\312\026\316\023"
+      "\265nS\256(VD\016\243\215\353\241\021\257N\020\340\216\365\272\220O."
+      "\224\374\336\246\177]"
+      "\3107\267\357\312\254\213\237\033\324\306\021\205\323g92\321\202\312N"
+      "\271D\003\203hV\013\314\375z*\276\007"));
+}
+
+FUZZ_TEST(NpCppDeserializationFuzzers, DeserializeWithCredentials)
+    .WithDomains(fuzztest::Arbitrary<std::vector<IdentityData>>()
+                     .WithMinSize(0)
+                     .WithMaxSize(1000),
+                 fuzztest::Arbitrary<std::vector<uint8_t>>()
+                     .WithMinSize(0)
+                     .WithMaxSize(255))
+    .WithSeeds(DeserializeWithCredentialSeedData);
+
+// Lets encourage the fuzzer to try with a lot of credentials and make sure
+// nothing falls apart. By default the vec ranges are somewhere between 1-20
+// even with setting a max of 1000, so setting a high minimum here to ensure the
+// higher end of credential iteration is hit.
+FUZZ_TEST(NpCppDeserializationFuzzersLotsOfCredentials,
+          DeserializeWithCredentials)
+    .WithDomains(
+        fuzztest::Arbitrary<std::vector<IdentityData>>().WithMinSize(10000),
+        fuzztest::Arbitrary<std::vector<uint8_t>>().WithMinSize(0).WithMaxSize(
+            255));
+
+// Helpers to trigger result processing code paths.
+void HandleV0Adv(nearby_protocol::DeserializedV0Advertisement);
+void HandleLegibleV0Adv(nearby_protocol::LegibleDeserializedV0Advertisement);
+void HandleV0IdentityKind(nearby_protocol::DeserializedV0IdentityKind);
+void HandleDataElement(nearby_protocol::V0DataElement);
+
+void HandleV1Adv(nearby_protocol::DeserializedV1Advertisement);
+void HandleV1Section(nearby_protocol::DeserializedV1Section);
+void HandleV1DataElement(nearby_protocol::V1DataElement);
+
+void HandleAdvertisementResult(
+    nearby_protocol::DeserializeAdvertisementResult result) {
+  switch (result.GetKind()) {
+    case nearby_protocol::DeserializeAdvertisementResultKind::Error:
+      break;
+    case nearby_protocol::DeserializeAdvertisementResultKind::V0:
+      HandleV0Adv(result.IntoV0());
+      break;
+    case nearby_protocol::DeserializeAdvertisementResultKind::V1:
+      HandleV1Adv(result.IntoV1());
+      break;
+  }
+}
+
+void HandleV0Adv(nearby_protocol::DeserializedV0Advertisement result) {
+  switch (result.GetKind()) {
+    case nearby_protocol::DeserializedV0AdvertisementKind::Legible:
+      HandleLegibleV0Adv(result.IntoLegible());
+      break;
+    case nearby_protocol::DeserializedV0AdvertisementKind::
+        NoMatchingCredentials:
+      break;
+  }
+}
+
+void HandleLegibleV0Adv(
+    nearby_protocol::LegibleDeserializedV0Advertisement legible_adv) {
+  auto num_des = legible_adv.GetNumberOfDataElements();
+  auto payload = legible_adv.IntoPayload();
+  for (int i = 0; i < num_des; i++) {
+    auto de_result = payload.TryGetDataElement(i);
+    if (!de_result.ok()) {
+      return;
+    }
+    HandleDataElement(de_result.value());
+  }
+}
+
+void HandleDataElement(nearby_protocol::V0DataElement de) {
+  switch (de.GetKind()) {
+    case nearby_protocol::V0DataElementKind::TxPower: {
+      [[maybe_unused]] auto tx_power = de.AsTxPower();
+      break;
+    }
+    case nearby_protocol::V0DataElementKind::Actions: {
+      [[maybe_unused]] auto actions = de.AsActions();
+      break;
+    }
+  }
+}
+
+void HandleV1Adv(nearby_protocol::DeserializedV1Advertisement adv) {
+  auto legible_sections = adv.GetNumLegibleSections();
+  [[maybe_unused]] auto encrypted_sections = adv.GetNumUndecryptableSections();
+  for (auto i = 0; i < legible_sections; i++) {
+    auto section_result = adv.TryGetSection(i);
+    if (!section_result.ok()) {
+      return;
+    }
+    HandleV1Section(section_result.value());
+  }
+}
+
+void HandleV1Section(nearby_protocol::DeserializedV1Section section) {
+  auto num_des = section.NumberOfDataElements();
+  for (auto i = 0; i < num_des; i++) {
+    auto de_result = section.TryGetDataElement(i);
+    if (!de_result.ok()) {
+      return;
+    }
+  }
+}

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
deleted file mode 100644
index 3c409e7..0000000
--- a/nearby/presence/np_cpp_ffi/fuzz/fuzzer_np_cpp_deserialize.cc
+++ /dev/null

@@ -1,54 +0,0 @@
-/*
- * 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_slab = nearby_protocol::CredentialSlab::TryCreate();
-  if (!credential_slab.ok()) {
-    printf("Error: create Credential slab failed\n");
-    __builtin_trap();
-  }
-
-  auto credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(credential_slab.value());
-  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;
-}

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
deleted file mode 100644
index 2475b5e..0000000
--- a/nearby/presence/np_cpp_ffi/fuzz/fuzzer_np_cpp_valid_header.cc
+++ /dev/null

@@ -1,60 +0,0 @@
-/*
- * 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_slab = nearby_protocol::CredentialSlab::TryCreate();
-  if (!credential_slab.ok()) {
-    printf("Error: create Credential slab failed\n");
-    __builtin_trap();
-  }
-
-  auto credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(credential_slab.value());
-  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;
-}

diff --git a/nearby/presence/np_cpp_ffi/fuzz/generate_fuzz_corpus.cc b/nearby/presence/np_cpp_ffi/fuzz/generate_fuzz_corpus.cc
deleted file mode 100644
index 9d28f7a..0000000
--- a/nearby/presence/np_cpp_ffi/fuzz/generate_fuzz_corpus.cc
+++ /dev/null

@@ -1,44 +0,0 @@
-// 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
index 2cb410d..1cc73d7 100644
--- a/nearby/presence/np_cpp_ffi/include/nearby_protocol.h
+++ b/nearby/presence/np_cpp_ffi/include/nearby_protocol.h

@@ -15,12 +15,21 @@
 #ifndef NEARBY_PRESENCE_NP_CPP_FFI_INCLUDE_NP_PROTOCOL_H_
 #define NEARBY_PRESENCE_NP_CPP_FFI_INCLUDE_NP_PROTOCOL_H_
 
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <span>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/status/status.h"
 #include "absl/status/statusor.h"
 #include "absl/strings/str_format.h"
+#include "absl/strings/string_view.h"
 #include "np_cpp_ffi_types.h"
 
-#include <span>
-
 // 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
@@ -52,20 +61,35 @@
 namespace nearby_protocol {
 
 // Re-exporting cbindgen generated types which are used in the public API
-using np_ffi::internal::AddCredentialToSlabResult;
+using np_ffi::internal::AddV0CredentialToSlabResult;
+using np_ffi::internal::AddV0DEResult;
+using np_ffi::internal::AddV1CredentialToSlabResult;
+using np_ffi::internal::AdvertisementBuilderKind;
 using np_ffi::internal::BooleanActionType;
 using np_ffi::internal::CreateCredentialBookResultKind;
 using np_ffi::internal::CreateCredentialSlabResultKind;
+using np_ffi::internal::CreateV0AdvertisementBuilderResultKind;
+using np_ffi::internal::CreateV1SectionBuilderResultKind;
 using np_ffi::internal::DeserializeAdvertisementResultKind;
 using np_ffi::internal::DeserializedV0AdvertisementKind;
+using np_ffi::internal::DeserializedV0IdentityDetails;
 using np_ffi::internal::DeserializedV0IdentityKind;
+using np_ffi::internal::DeserializedV1IdentityDetails;
 using np_ffi::internal::DeserializedV1IdentityKind;
+using np_ffi::internal::EncryptedIdentityType;
 using np_ffi::internal::GetV0DEResultKind;
 using np_ffi::internal::PanicReason;
-using np_ffi::internal::TxPower;
+using np_ffi::internal::SerializeV0AdvertisementResultKind;
+using np_ffi::internal::SerializeV1AdvertisementResultKind;
 using np_ffi::internal::V0DataElementKind;
+using np_ffi::internal::V1VerificationMode;
 
-template <uintptr_t N> using FfiByteBuffer = np_ffi::internal::ByteBuffer<N>;
+const uint8_t MAX_ADV_PAYLOAD_SIZE = 255;
+const uint8_t MAX_V1_DE_PAYLOAD_SIZE = 127;
+const uint8_t KEY_SEED_SIZE = 32;
+const uint8_t HMAC_TAG_SIZE = 32;
+const uint8_t PUBLIC_SIGNING_KEY_SIZE = 32;
+const uint8_t DERIVED_SALT_SIZE = 16;
 
 // All of the types defined in this header
 class RawAdvertisementPayload;
@@ -96,11 +120,11 @@
 // on memory consumption. See np_ffi_global_config_* functions in
 // np_cpp_ffi_functions.h for more info
 class GlobalConfig {
-public:
+ 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(const GlobalConfig &) = delete;
+  void operator=(const GlobalConfig &) = delete;
   GlobalConfig() = delete;
 
   // Provides a user specified panic handler. This method will only have an
@@ -139,14 +163,20 @@
   // which may be active at any one time
   static void SetMaxNumDeserializedV1Advertisements(
       uint32_t max_num_deserialized_v1_advertisements);
+
+  // Sets the maximum number of active handles to v0 advertisement builders
+  // which may be active at any one time
+  static void SetMaxNumV0AdvertisementBuilders(
+      uint32_t max_num_v0_advertisement_builders);
 };
 
 // Holds the credentials used in the construction of a credential book
 // using CredentialBook::TryCreateFromSlab()
 class CredentialSlab {
-public:
-  // Don't allow copy constructor or copy assignment, since that would result in
-  // the underlying handle being freed multiple times
+ public:
+  // Don't allow copy constructor, copy-assignment or default constructor, since
+  // this class wraps a handle to externally allocated resources.
+  CredentialSlab() = delete;
   CredentialSlab(const CredentialSlab &other) = delete;
   CredentialSlab &operator=(const CredentialSlab &other) = delete;
 
@@ -170,7 +200,7 @@
   // Adds a V1 credential to the slab
   [[nodiscard]] absl::Status AddV1Credential(V1MatchableCredential v1_cred);
 
-private:
+ private:
   friend class CredentialBook;
   explicit CredentialSlab(np_ffi::internal::CredentialSlab credential_slab)
       : credential_slab_(credential_slab), moved_(false) {}
@@ -183,9 +213,10 @@
 // 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
+ public:
+  // Don't allow copy constructor, copy-assignment or default constructor, since
+  // this class wraps a handle to externally allocated resources.
+  CredentialBook() = delete;
   CredentialBook(const CredentialBook &other) = delete;
   CredentialBook &operator=(const CredentialBook &other) = delete;
 
@@ -203,10 +234,10 @@
   // returning the CredentialBook on success or a Status code on failure.
   // The passed credential-slab will be deallocated if this operation
   // is successful.
-  [[nodiscard]] static absl::StatusOr<CredentialBook>
-  TryCreateFromSlab(CredentialSlab &slab);
+  [[nodiscard]] static absl::StatusOr<CredentialBook> TryCreateFromSlab(
+      CredentialSlab &slab);
 
-private:
+ private:
   friend class Deserializer;
   explicit CredentialBook(np_ffi::internal::CredentialBook credential_book)
       : credential_book_(credential_book), moved_(false) {}
@@ -218,21 +249,20 @@
 // Holds data associated with a specific credential which will be returned to
 // the caller when it is successfully matched with an advertisement.
 class MatchedCredentialData {
-public:
+ public:
   // Creates matched credential data from a provided credential_id used to
   // correlate the data back to its full credential data, and the metadata byte
-  // buffer as copied from the given span over bytes. After calling
-  // this the bytes are copied into the rust code, so the
-  // encrypted_metadata_bytes_buffer can be freed.
+  // buffer as copied from the given span over bytes. The span must be valid
+  // until the corresponding Add_*_Credential is called using this data.
   //
   // Safety: this is safe if the span is over a valid buffer of bytes. The copy
   // from the memory address isn't atomic, so concurrent modification of the
   // array from another thread would cause undefined behavior.
-  [[nodiscard]] MatchedCredentialData(uint32_t cred_id,
-                                      std::span<uint8_t> metadata_bytes);
+  [[nodiscard]] MatchedCredentialData(
+      uint32_t cred_id, std::span<const uint8_t> encrypted_metadata_bytes);
 
-private:
-  np_ffi::internal::FfiMatchedCredential data_;
+ private:
+  np_ffi::internal::FfiMatchedCredential data_{};
   friend class V0MatchableCredential;
   friend class V1MatchableCredential;
 };
@@ -241,15 +271,15 @@
 // advertisements, along with some provided matched data that will be returned
 // back to the caller upon a successful credential match.
 class V0MatchableCredential {
-public:
+ public:
   // Creates a new V0MatchableCredential from a key seed, its calculated hmac
   // value and some match data.
   [[nodiscard]] V0MatchableCredential(
-      std::array<uint8_t, 32> key_seed,
-      std::array<uint8_t, 32> legacy_metadata_key_hmac,
+      std::array<uint8_t, KEY_SEED_SIZE> key_seed,
+      std::array<uint8_t, HMAC_TAG_SIZE> legacy_metadata_key_hmac,
       MatchedCredentialData matched_credential_data);
 
-private:
+ private:
   friend class CredentialSlab;
   np_ffi::internal::V0MatchableCredential internal_{};
 };
@@ -258,34 +288,78 @@
 // advertisements, along with some provided matched data that will be returned
 // back to the caller upon a successful credential match.
 class V1MatchableCredential {
-public:
+ public:
+  V1MatchableCredential() = delete;
+
   // Creates a new V1MatchableCredential from key material, its calculated hmac
   // value and some match data.
   [[nodiscard]] V1MatchableCredential(
-      std::array<uint8_t, 32> key_seed,
-      std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac,
-      std::array<uint8_t, 32> expected_signed_metadata_key_hmac,
-      std::array<uint8_t, 32> pub_key,
+      std::array<uint8_t, KEY_SEED_SIZE> key_seed,
+      std::array<uint8_t, HMAC_TAG_SIZE> expected_unsigned_metadata_key_hmac,
+      std::array<uint8_t, HMAC_TAG_SIZE> expected_signed_metadata_key_hmac,
+      std::array<uint8_t, PUBLIC_SIGNING_KEY_SIZE> pub_key,
       MatchedCredentialData matched_credential_data);
 
-private:
+ private:
   friend class CredentialSlab;
-  np_ffi::internal::V1MatchableCredential internal_;
+  np_ffi::internal::V1MatchableCredential internal_{};
 };
 
-// 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) {}
+// Holds the V0 credential data needed to encrypt advertisements.
+class V0BroadcastCredential {
+ public:
+  V0BroadcastCredential() = delete;
+
+  // Creates a new V0Broadcast credential with the given
+  // key seed and metadata key.
+  [[nodiscard]] V0BroadcastCredential(std::array<uint8_t, 32> key_seed,
+                                      std::array<uint8_t, 14> metadata_key);
+
+ private:
+  friend class V0AdvertisementBuilder;
+  np_ffi::internal::V0BroadcastCredential internal_;
+};
+
+// Representation of a buffer of bytes returned from and passed to Rust library
+// deserialization APIs. `N` is the max size of the buffer but its actual
+// contents can be up to N in size.
+template <size_t N>
+class ByteBuffer {
+ public:
+  // Constructs a ByteBuffer from an std::array of bytes
+  template <size_t M>
+  [[nodiscard]] constexpr explicit ByteBuffer(std::array<uint8_t, M> data) {
+    static_assert(N >= M);
+    np_ffi::internal::ByteBuffer<N> internal =
+        np_ffi::internal::ByteBuffer<N>();
+    internal.len = M;
+    std::copy(data.begin(), data.end(), internal.bytes);
+    internal_ = internal;
+  }
+
+  // Creates a ByteBuffer from a std::vector<uint8_t> 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>> TryFromSpan(
+      std::span<const uint8_t> bytes) {
+    if (bytes.size() > N) {
+      return absl::OutOfRangeError(
+          absl::StrFormat("Provided bytes of length %d will not fit into a "
+                          "ByteBuffer<N> of size N=%d",
+                          bytes.size(), N));
+    }
+    np_ffi::internal::ByteBuffer<N> internal =
+        np_ffi::internal::ByteBuffer<N>();
+    internal.len = bytes.size();
+    std::copy(std::begin(bytes), std::end(bytes), internal.bytes);
+    return ByteBuffer(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) {
+  [[nodiscard]] static absl::StatusOr<ByteBuffer<N>> TryFromString(
+      absl::string_view bytes) {
     if (bytes.length() > N) {
       return absl::OutOfRangeError(
           absl::StrFormat("Provided bytes of length %d will not fit into a "
@@ -301,7 +375,7 @@
 
   // 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() {
+  [[nodiscard]] std::vector<uint8_t> ToVector() const {
     std::vector<uint8_t> result(internal_.bytes,
                                 internal_.bytes + internal_.len);
     return result;
@@ -310,64 +384,71 @@
   // 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() {
+  [[nodiscard]] std::string ToString() const {
     std::string result;
     result.assign(internal_.bytes, internal_.bytes + internal_.len);
     return result;
   }
+  // 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(np_ffi::internal::ByteBuffer<N> internal)
+      : internal_(internal) {}
 
-private:
+ private:
+  friend class V0AdvertisementBuilder;
   friend class V1DataElement;
   friend class Deserializer;
   np_ffi::internal::ByteBuffer<N> internal_;
 };
 
 class RawAdvertisementPayload {
-public:
+ public:
   // Creates a RawAdvertisementPayload from a ByteBuffer.
-  explicit RawAdvertisementPayload(ByteBuffer<255> bytes) : buffer_(bytes) {}
+  explicit constexpr RawAdvertisementPayload(
+      ByteBuffer<MAX_ADV_PAYLOAD_SIZE> bytes)
+      : buffer_(bytes) {}
 
-  ByteBuffer<255> buffer_;
-
-private:
+ private:
+  ByteBuffer<MAX_ADV_PAYLOAD_SIZE> buffer_;
   friend class Deserializer;
 };
 
 // A global static Deserializer, configured by GlobalConfig and used to
 // deserialize advertisement payloads
 class Deserializer {
-public:
+ 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);
+  [[nodiscard]] static DeserializeAdvertisementResult DeserializeAdvertisement(
+      const 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
+ public:
+  // Don't allow copy constructor, copy-assignment or default constructor, since
+  // this class wraps a handle to externally allocated resources.
+  DeserializeAdvertisementResult() = delete;
   DeserializeAdvertisementResult(const DeserializeAdvertisementResult &other) =
       delete;
-  DeserializeAdvertisementResult &
-  operator=(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;
+  DeserializeAdvertisementResult &operator=(
+      DeserializeAdvertisementResult &&other) noexcept;
 
   // Frees the underlying resources of the result.
   ~DeserializeAdvertisementResult();
 
   // Returns the DeserializeAdvertisementResultKind of the Result
-  [[nodiscard]] DeserializeAdvertisementResultKind GetKind();
+  [[nodiscard]] DeserializeAdvertisementResultKind GetKind() const;
 
   // Casts a `DeserializeAdvertisementResult` to the `V0` variant, panicking in
   // the case where the passed value is of a different enum variant. This can
@@ -381,7 +462,7 @@
   // is no longer valid.
   [[nodiscard]] DeserializedV1Advertisement IntoV1();
 
-private:
+ private:
   friend class Deserializer;
   explicit DeserializeAdvertisementResult(
       np_ffi::internal::DeserializeAdvertisementResult result)
@@ -393,25 +474,26 @@
 
 // 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
+ public:
+  // Don't allow copy constructor, copy-assignment or default constructor, since
+  // this class wraps a handle to externally allocated resources.
+  DeserializedV0Advertisement() = delete;
   DeserializedV0Advertisement(const DeserializedV0Advertisement &other) =
       delete;
-  DeserializedV0Advertisement &
-  operator=(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;
+  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();
+  [[nodiscard]] DeserializedV0AdvertisementKind GetKind() const;
 
   // Casts a `DeserializedV0Advertisement` to the `Legible` variant, panicking
   // in the case where the passed value is of a different enum variant.
@@ -419,7 +501,7 @@
   // `LegibleDeserializedV0Advertisement`, and this object is no longer valid.
   [[nodiscard]] LegibleDeserializedV0Advertisement IntoLegible();
 
-private:
+ private:
   friend class DeserializeAdvertisementResult;
   explicit DeserializedV0Advertisement(
       np_ffi::internal::DeserializedV0Advertisement v0_advertisement)
@@ -433,19 +515,20 @@
 // 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
+ public:
+  // Don't allow copy constructor, copy-assignment or default constructor, since
+  // this class wraps a handle to externally allocated resources.
+  LegibleDeserializedV0Advertisement() = delete;
   LegibleDeserializedV0Advertisement(
       const LegibleDeserializedV0Advertisement &other) = delete;
-  LegibleDeserializedV0Advertisement &
-  operator=(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;
+  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.
@@ -453,13 +536,13 @@
 
   // Returns just the kind of identity (public/encrypted)
   // associated with the advertisement
-  [[nodiscard]] DeserializedV0IdentityKind GetIdentityKind();
+  [[nodiscard]] DeserializedV0IdentityKind GetIdentityKind() const;
   // Returns the number of data elements in the advertisement
-  [[nodiscard]] uint8_t GetNumberOfDataElements();
+  [[nodiscard]] uint8_t GetNumberOfDataElements() const;
   // Returns just the data-element payload of the advertisement
   [[nodiscard]] V0Payload IntoPayload();
 
-private:
+ private:
   friend class DeserializedV0Advertisement;
   explicit LegibleDeserializedV0Advertisement(
       np_ffi::internal::LegibleDeserializedV0Advertisement
@@ -473,9 +556,10 @@
 
 // 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.
+ public:
+  // Don't allow copy constructor, copy-assignment or default constructor, since
+  // this class wraps a handle to externally allocated resources.
+  V0Payload() = delete;
   V0Payload(const V0Payload &other) = delete;
   V0Payload &operator=(const V0Payload &other) = delete;
 
@@ -488,9 +572,20 @@
 
   // 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);
+  [[nodiscard]] absl::StatusOr<V0DataElement> TryGetDataElement(
+      uint8_t index) const;
 
-private:
+  // Decrypts the metadata of the credential which matched with this
+  // advertisement, or returns an error if the metadata key is invalid and
+  // unable to successfully decrypt the metadata.
+  [[nodiscard]] absl::StatusOr<std::vector<uint8_t>> DecryptMetadata() const;
+
+  // Gets the details of the identity data element of this payload or returns an
+  // error if the payload does not have an identity (public advertisement)
+  [[nodiscard]] absl::StatusOr<DeserializedV0IdentityDetails>
+  GetIdentityDetails() const;
+
+ private:
   friend class LegibleDeserializedV0Advertisement;
   explicit V0Payload(np_ffi::internal::V0Payload v0_payload)
       : v0_payload_(v0_payload), moved_(false) {}
@@ -499,40 +594,102 @@
   bool moved_;
 };
 
-// A single deserialized V0 data element
+// A Tx Power [transmission power] between -100dBm and 20dBm
+class TxPower {
+ public:
+  TxPower() = delete;
+
+  // Gets the value of this tx power as a signed byte.
+  [[nodiscard]] int8_t GetAsI8() const;
+
+  // Attempts to construct a tx power with the given value contained
+  // in a signed byte. If the number is not within the representable
+  // range, this method will return an invalid argument error.
+  [[nodiscard]] static absl::StatusOr<TxPower> TryBuildFromI8(int8_t value);
+
+ private:
+  friend class V0DataElement;
+  explicit TxPower(np_ffi::internal::TxPower tx_power) : tx_power_(tx_power) {}
+  np_ffi::internal::TxPower tx_power_;
+};
+
+// A single V0 data element
 class V0DataElement {
-public:
+ public:
   // Yields the V0DataElementKind of the data element
-  [[nodiscard]] V0DataElementKind GetKind();
+  [[nodiscard]] V0DataElementKind GetKind() const;
   // Casts the V0DataElement into the TxPower variant, panicking in the case
   // where the data element is of a different enum variant
-  [[nodiscard]] TxPower AsTxPower();
+  [[nodiscard]] TxPower AsTxPower() const;
   // Casts the V0DataElement into the Actions variant, panicking in the case
   // where the data element is of a different enum variant
-  [[nodiscard]] V0Actions AsActions();
+  [[nodiscard]] V0Actions AsActions() const;
 
-private:
+  // Constructs a Tx Power V0 data element
+  explicit V0DataElement(TxPower tx_power);
+  // Constructs an Actions V0 data element
+  explicit V0DataElement(V0Actions actions);
+
+ private:
+  friend class V0AdvertisementBuilder;
   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 Context Sync Sequence Number [0-15]
+class ContextSyncSeqNum {
+ public:
+  ContextSyncSeqNum() = delete;
+
+  // Gets the value of this context-sync sequence number.
+  [[nodiscard]] uint8_t GetAsU8() const;
+
+  // Attempts to construct a context-sync sequence number with the given
+  // value contained in an unsigned byte. If the number may not be
+  // represented in a single nibble, this method will return an
+  // invalid argument error.
+  [[nodiscard]] static absl::StatusOr<ContextSyncSeqNum> TryBuildFromU8(
+      uint8_t value);
+
+ private:
+  friend class V0Actions;
+  explicit ContextSyncSeqNum(np_ffi::internal::ContextSyncSeqNum seq_num)
+      : seq_num_(seq_num) {}
+  np_ffi::internal::ContextSyncSeqNum seq_num_;
+};
+
 // A V0 Actions Data Element
 class V0Actions {
-public:
+ public:
+  V0Actions() = delete;
+
   // 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();
+  [[nodiscard]] uint32_t GetAsU32() const;
 
   /// Return whether a boolean action type is present in this data element
-  [[nodiscard]] bool HasAction(BooleanActionType action);
+  [[nodiscard]] bool HasAction(BooleanActionType action) const;
 
-  /// Gets the 4 bit context sync sequence number as a uint8_t from this data
-  /// element
-  [[nodiscard]] uint8_t GetContextSyncSequenceNumber();
+  /// Gets the 4 bit context sync sequence number from this data element
+  [[nodiscard]] ContextSyncSeqNum GetContextSyncSequenceNumber() const;
 
-private:
+  /// Attempts to set the given action bit to the given boolean value.
+  /// This operation may fail with an invalid argument error
+  /// if the requested action bit may not be set given the encoding
+  /// of the containing advertisement.
+  /// In this case, the action bits will be unaltered by this call.
+  absl::Status TrySetAction(BooleanActionType action, bool value);
+
+  /// Sets the context sync sequence number.
+  void SetContextSyncSequenceNumber(ContextSyncSeqNum seq_num);
+
+  // Constructs an all-zeroed V0 actions DE for the given advertisement builder
+  // kind.
+  [[nodiscard]] static V0Actions BuildNewZeroed(AdvertisementBuilderKind kind);
+
+ private:
   friend class V0DataElement;
   explicit V0Actions(np_ffi::internal::V0Actions actions) : actions_(actions) {}
   np_ffi::internal::V0Actions actions_;
@@ -540,32 +697,33 @@
 
 // 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
+ public:
+  // Don't allow copy constructor, copy-assignment or default constructor, since
+  // this class wraps a handle to externally allocated resources.
+  DeserializedV1Advertisement() = delete;
   DeserializedV1Advertisement(const DeserializedV1Advertisement &other) =
       delete;
-  DeserializedV1Advertisement &
-  operator=(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;
+  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();
+  [[nodiscard]] uint8_t GetNumLegibleSections() const;
   // 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();
+  [[nodiscard]] uint8_t GetNumUndecryptableSections() const;
   // 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);
+  [[nodiscard]] absl::StatusOr<DeserializedV1Section> TryGetSection(
+      uint8_t section_index) const;
 
-private:
+ private:
   friend class DeserializeAdvertisementResult;
   explicit DeserializedV1Advertisement(
       np_ffi::internal::DeserializedV1Advertisement v1_advertisement);
@@ -576,15 +734,34 @@
 
 // A Deserialized V1 Section of an advertisement
 class DeserializedV1Section {
-public:
+ 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);
+  [[nodiscard]] uint8_t NumberOfDataElements() const;
 
-private:
+  // Returns the DeserializedV1IdentityKind of the identity
+  [[nodiscard]] DeserializedV1IdentityKind GetIdentityKind() const;
+
+  // Tries to get the data element in the section at the given index
+  [[nodiscard]] absl::StatusOr<V1DataElement> TryGetDataElement(
+      uint8_t index) const;
+
+  // Decrypts the metadata of the credential which matched with this section
+  [[nodiscard]] absl::StatusOr<std::vector<uint8_t>> DecryptMetadata() const;
+
+  // Gets the details of the identity data element of this section or returns an
+  // error if the section does not contain an identity (public section)
+  [[nodiscard]] absl::StatusOr<DeserializedV1IdentityDetails>
+  GetIdentityDetails() const;
+
+  // Attempts to derive a 16-byte DE salt for a DE in this section with the
+  // given DE offset. This operation may fail if the passed offset is 255
+  // (causes overflow) or if the section is leveraging a public identity, and
+  // hence, doesn't have an associated salt. The offset should come from a
+  // particular deserialized v1 de via `V1DataElement::GetOffset()`
+  [[nodiscard]] absl::StatusOr<std::array<uint8_t, DERIVED_SALT_SIZE>>
+  DeriveSaltForOffset(uint8_t offset) const;
+
+ private:
   friend class DeserializedV1Advertisement;
   explicit DeserializedV1Section(
       np_ffi::internal::DeserializedV1Section section,
@@ -599,19 +776,81 @@
 
 // A V1 Data Element
 class V1DataElement {
-public:
+ 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;
+  [[nodiscard]] ByteBuffer<MAX_V1_DE_PAYLOAD_SIZE> GetPayload() const;
+  /// Gets the offset for this V1 data element.
+  [[nodiscard]] uint8_t GetOffset() const;
 
-private:
+ 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
+// A builder for V0 advertisements
+class V0AdvertisementBuilder {
+ public:
+  V0AdvertisementBuilder() = delete;
+  // Don't allow copy constructor or copy assignment, since that would result in
+  // the underlying handle being freed multiple times
+  V0AdvertisementBuilder(const V0AdvertisementBuilder &other) = delete;
+  V0AdvertisementBuilder &operator=(const V0AdvertisementBuilder &other) =
+      delete;
 
-#endif // NEARBY_PRESENCE_NP_CPP_FFI_INCLUDE_NP_PROTOCOL_H_
+  // Move constructor and move assignment operators
+  V0AdvertisementBuilder(V0AdvertisementBuilder &&other) noexcept;
+  V0AdvertisementBuilder &operator=(V0AdvertisementBuilder &&other) noexcept;
+
+  // Frees the underlying resources of the adv builder.
+  ~V0AdvertisementBuilder();
+
+  // Tries to add the given data element to the advertisement builder.
+  // May fail with:
+  //  - An invalid argument code if:
+  //    - The adv builder handle is invalid
+  //    OR
+  //    - The identity type of the adv builder is invalid
+  //    for the data element we're attempting to add.
+  //  - A resource exhausted error if there's no remaining adv space.
+  absl::Status TryAddDE(V0DataElement de);
+
+  // Attempts to serialize the contents of the advertisement
+  // builder to bytes. This operation will always result in the
+  // contents behind the handle for this instance being deallocated.
+  //
+  // This operation may return an out-of-range error in the case
+  // where the advertisement contents are of a size inappropriate
+  // for LDT encryption in an encrypted V0 advertisement.
+  [[nodiscard]] absl::StatusOr<ByteBuffer<24>> TrySerialize();
+
+  // Creates a new V0 advertisement builder for a public advertisement,
+  // or returns a Status code on failure.
+  [[nodiscard]] static absl::StatusOr<V0AdvertisementBuilder> TryCreatePublic();
+
+  // Creates a new V0 advertisement builder for an encrypted advertisement,
+  // or returns a Status code on failure.
+  [[nodiscard]] static absl::StatusOr<V0AdvertisementBuilder>
+  TryCreateEncrypted(V0BroadcastCredential broadcast_cred,
+                     EncryptedIdentityType identity_type,
+                     std::array<uint8_t, 2> salt);
+
+ private:
+  [[nodiscard]] static absl::StatusOr<V0AdvertisementBuilder>
+  CreateV0AdvertisementBuilderResultToInternal(
+      np_ffi::internal::CreateV0AdvertisementBuilderResult result);
+
+  explicit V0AdvertisementBuilder(
+      np_ffi::internal::V0AdvertisementBuilder adv_builder)
+      : adv_builder_(adv_builder), moved_(false) {}
+
+  np_ffi::internal::V0AdvertisementBuilder adv_builder_;
+  bool moved_;
+};
+
+}  //  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
index b6730ef..360f7ad 100644
--- a/nearby/presence/np_cpp_ffi/nearby_protocol.cc
+++ b/nearby/presence/np_cpp_ffi/nearby_protocol.cc

@@ -12,29 +12,36 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "include/nearby_protocol.h"
+#include "nearby_protocol.h"
 
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <iostream>
+#include <memory>
+#include <span>
+#include <utility>
+#include <vector>
+
+#include "absl/status/status.h"
+#include "absl/status/statusor.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__ */
+#include "np_cpp_ffi_types.h"
 
 namespace nearby_protocol {
 
-static void panic_handler(PanicReason reason);
+void panic_handler(PanicReason reason);
 
 struct PanicHandler {
   void (*handler)(PanicReason);
   bool set_by_client;
 };
 
-static PanicHandler gPanicHandler = PanicHandler{panic_handler, false};
+PanicHandler gPanicHandler = PanicHandler{panic_handler, false};
 
 // C++ layer internal panic handler
-static void panic_handler(PanicReason reason) {
+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) {
@@ -43,8 +50,8 @@
   std::abort();
 }
 
-static void _assert_panic(bool condition, const char *func, const char *file,
-                          int line) {
+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";
@@ -52,7 +59,7 @@
   }
 }
 
-#define assert_panic(e) _assert_panic(e, __func__, __ASSERT_FILE_NAME, __LINE__)
+#define assert_panic(e) _assert_panic(e, __func__, __FILE__, __LINE__)
 
 bool GlobalConfig::SetPanicHandler(void (*handler)(PanicReason)) {
   if (!gPanicHandler.set_by_client) {
@@ -63,49 +70,57 @@
   return false;
 }
 
-void GlobalConfig::SetNumShards(uint8_t num_shards) {
+void GlobalConfig::SetNumShards(const uint8_t num_shards) {
   np_ffi::internal::np_ffi_global_config_set_num_shards(num_shards);
 }
 
-void GlobalConfig::SetMaxNumCredentialSlabs(uint32_t max_num_credential_slabs) {
+void GlobalConfig::SetMaxNumCredentialSlabs(
+    const uint32_t max_num_credential_slabs) {
   np_ffi::internal::np_ffi_global_config_set_max_num_credential_slabs(
       max_num_credential_slabs);
 }
 
-void GlobalConfig::SetMaxNumCredentialBooks(uint32_t max_num_credential_books) {
+void GlobalConfig::SetMaxNumCredentialBooks(
+    const 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) {
+    const 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) {
+    const 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);
 }
 
+void GlobalConfig::SetMaxNumV0AdvertisementBuilders(
+    uint32_t max_num_v0_advertisement_builders) {
+  np_ffi::internal::np_ffi_global_config_set_max_num_v0_advertisement_builders(
+      max_num_v0_advertisement_builders);
+}
+
 absl::StatusOr<CredentialSlab> CredentialSlab::TryCreate() {
   auto result = np_ffi::internal::np_ffi_create_credential_slab();
   auto kind = np_ffi::internal::np_ffi_CreateCredentialSlabResult_kind(result);
 
   switch (kind) {
-  case CreateCredentialSlabResultKind::Success: {
-    auto slab = CredentialSlab(
-        np_ffi::internal::np_ffi_CreateCredentialSlabResult_into_SUCCESS(
-            result));
-    return slab;
-  }
-  case CreateCredentialSlabResultKind::NoSpaceLeft: {
-    return absl::ResourceExhaustedError(
-        "No space left to create credential slab");
-  }
+    case CreateCredentialSlabResultKind::Success: {
+      auto slab = CredentialSlab(
+          np_ffi::internal::np_ffi_CreateCredentialSlabResult_into_SUCCESS(
+              result));
+      return slab;
+    }
+    case CreateCredentialSlabResultKind::NoSpaceLeft: {
+      return absl::ResourceExhaustedError(
+          "No space left to create credential slab");
+    }
   }
 }
 
@@ -117,13 +132,13 @@
   }
 }
 
-CredentialSlab::CredentialSlab(CredentialSlab &&other) noexcept
+CredentialSlab::CredentialSlab(CredentialSlab&& other) noexcept
     : credential_slab_(other.credential_slab_), moved_(other.moved_) {
   other.credential_slab_ = {};
   other.moved_ = true;
 }
 
-CredentialSlab &CredentialSlab::operator=(CredentialSlab &&other) noexcept {
+CredentialSlab& CredentialSlab::operator=(CredentialSlab&& other) noexcept {
   if (this != &other) {
     if (!this->moved_) {
       auto result = np_ffi::internal::np_ffi_deallocate_credential_slab(
@@ -140,58 +155,64 @@
   return *this;
 }
 
-absl::Status CredentialSlab::AddV0Credential(V0MatchableCredential v0_cred) {
+absl::Status CredentialSlab::AddV0Credential(
+    const V0MatchableCredential v0_cred) {
   assert_panic(!this->moved_);
   auto result = np_ffi::internal::np_ffi_CredentialSlab_add_v0_credential(
       this->credential_slab_, v0_cred.internal_);
   switch (result) {
-  case AddCredentialToSlabResult::Success: {
-    return absl::OkStatus();
-  }
-  case AddCredentialToSlabResult::InvalidHandle: {
-    return absl::InvalidArgumentError(
-        "invalid credential slab handle provided");
-  }
+    case AddV0CredentialToSlabResult::Success: {
+      return absl::OkStatus();
+    }
+    case AddV0CredentialToSlabResult::InvalidHandle: {
+      return absl::InvalidArgumentError(
+          "invalid credential slab handle provided");
+    }
   }
 }
 
-absl::Status CredentialSlab::AddV1Credential(V1MatchableCredential v1_cred) {
+absl::Status CredentialSlab::AddV1Credential(
+    const V1MatchableCredential v1_cred) {
   assert_panic(!this->moved_);
   auto result = np_ffi::internal::np_ffi_CredentialSlab_add_v1_credential(
       this->credential_slab_, v1_cred.internal_);
   switch (result) {
-  case AddCredentialToSlabResult::Success: {
-    return absl::OkStatus();
-  }
-  case AddCredentialToSlabResult::InvalidHandle: {
-    return absl::InvalidArgumentError(
-        "invalid credential slab handle provided");
-  }
+    case AddV1CredentialToSlabResult::Success: {
+      return absl::OkStatus();
+    }
+    case AddV1CredentialToSlabResult::InvalidHandle: {
+      return absl::InvalidArgumentError(
+          "invalid credential slab handle provided");
+    }
+    case AddV1CredentialToSlabResult::InvalidPublicKeyBytes: {
+      return absl::InvalidArgumentError(
+          "Invalid public key bytes in credential");
+    }
   }
 }
 
-absl::StatusOr<CredentialBook>
-CredentialBook::TryCreateFromSlab(CredentialSlab &slab) {
+absl::StatusOr<CredentialBook> CredentialBook::TryCreateFromSlab(
+    CredentialSlab& slab) {
   assert_panic(!slab.moved_);
   auto result = np_ffi::internal::np_ffi_create_credential_book_from_slab(
       slab.credential_slab_);
   auto kind = np_ffi::internal::np_ffi_CreateCredentialBookResult_kind(result);
   switch (kind) {
-  case CreateCredentialBookResultKind::Success: {
-    auto book =
-        np_ffi::internal::np_ffi_CreateCredentialBookResult_into_SUCCESS(
-            result);
-    slab.moved_ = true;
-    return CredentialBook(book);
-  }
-  case CreateCredentialBookResultKind::NoSpaceLeft: {
-    return absl::ResourceExhaustedError(
-        "No space left to create credential book");
-  }
-  case CreateCredentialBookResultKind::InvalidSlabHandle: {
-    return absl::NotFoundError(
-        "The slab referenced by the given handle was not found.");
-  }
+    case CreateCredentialBookResultKind::Success: {
+      auto book =
+          np_ffi::internal::np_ffi_CreateCredentialBookResult_into_SUCCESS(
+              result);
+      slab.moved_ = true;
+      return CredentialBook(book);
+    }
+    case CreateCredentialBookResultKind::NoSpaceLeft: {
+      return absl::ResourceExhaustedError(
+          "No space left to create credential book");
+    }
+    case CreateCredentialBookResultKind::InvalidSlabHandle: {
+      return absl::NotFoundError(
+          "The slab referenced by the given handle was not found.");
+    }
   }
 }
 
@@ -203,13 +224,13 @@
   }
 }
 
-CredentialBook::CredentialBook(CredentialBook &&other) noexcept
+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 {
+CredentialBook& CredentialBook::operator=(CredentialBook&& other) noexcept {
   if (this != &other) {
     if (!this->moved_) {
       auto result = np_ffi::internal::np_ffi_deallocate_credential_book(
@@ -226,16 +247,17 @@
   return *this;
 }
 
-DeserializeAdvertisementResult
-Deserializer::DeserializeAdvertisement(RawAdvertisementPayload &payload,
-                                       const CredentialBook &credential_book) {
+DeserializeAdvertisementResult Deserializer::DeserializeAdvertisement(
+    const 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() {
+DeserializeAdvertisementResultKind DeserializeAdvertisementResult::GetKind()
+    const {
   assert_panic(!this->moved_);
   return np_ffi::internal::np_ffi_DeserializeAdvertisementResult_kind(result_);
 }
@@ -266,14 +288,14 @@
 }
 
 DeserializeAdvertisementResult::DeserializeAdvertisementResult(
-    DeserializeAdvertisementResult &&other) noexcept
+    DeserializeAdvertisementResult&& other) noexcept
     : result_(other.result_), moved_(other.moved_) {
   other.result_ = {};
   other.moved_ = true;
 }
 
-DeserializeAdvertisementResult &DeserializeAdvertisementResult::operator=(
-    DeserializeAdvertisementResult &&other) noexcept {
+DeserializeAdvertisementResult& DeserializeAdvertisementResult::operator=(
+    DeserializeAdvertisementResult&& other) noexcept {
   if (this != &other) {
     if (!this->moved_) {
       auto result =
@@ -292,14 +314,14 @@
 
 // V0 Stuff
 DeserializedV0Advertisement::DeserializedV0Advertisement(
-    DeserializedV0Advertisement &&other) noexcept
+    DeserializedV0Advertisement&& other) noexcept
     : v0_advertisement_(other.v0_advertisement_), moved_(other.moved_) {
   other.v0_advertisement_ = {};
   other.moved_ = true;
 }
 
-DeserializedV0Advertisement &DeserializedV0Advertisement::operator=(
-    DeserializedV0Advertisement &&other) noexcept {
+DeserializedV0Advertisement& DeserializedV0Advertisement::operator=(
+    DeserializedV0Advertisement&& other) noexcept {
   if (this != &other) {
     if (!this->moved_) {
       auto result =
@@ -326,7 +348,7 @@
 }
 
 np_ffi::internal::DeserializedV0AdvertisementKind
-DeserializedV0Advertisement::GetKind() {
+DeserializedV0Advertisement::GetKind() const {
   assert_panic(!this->moved_);
   return np_ffi::internal::np_ffi_DeserializedV0Advertisement_kind(
       v0_advertisement_);
@@ -343,16 +365,16 @@
 }
 
 LegibleDeserializedV0Advertisement::LegibleDeserializedV0Advertisement(
-    LegibleDeserializedV0Advertisement &&other) noexcept
+    LegibleDeserializedV0Advertisement&& other) noexcept
     : legible_v0_advertisement_(other.legible_v0_advertisement_),
       moved_(other.moved_) {
   other.moved_ = true;
   other.legible_v0_advertisement_ = {};
 }
 
-LegibleDeserializedV0Advertisement &
+LegibleDeserializedV0Advertisement&
 LegibleDeserializedV0Advertisement::operator=(
-    LegibleDeserializedV0Advertisement &&other) noexcept {
+    LegibleDeserializedV0Advertisement&& other) noexcept {
   if (this != &other) {
     if (!this->moved_) {
       auto result =
@@ -377,8 +399,8 @@
   }
 }
 
-DeserializedV0IdentityKind
-LegibleDeserializedV0Advertisement::GetIdentityKind() {
+DeserializedV0IdentityKind LegibleDeserializedV0Advertisement::GetIdentityKind()
+    const {
   assert_panic(!this->moved_);
   auto result = np_ffi::internal::
       np_ffi_LegibleDeserializedV0Advertisement_get_identity_kind(
@@ -386,7 +408,7 @@
   return result;
 }
 
-uint8_t LegibleDeserializedV0Advertisement::GetNumberOfDataElements() {
+uint8_t LegibleDeserializedV0Advertisement::GetNumberOfDataElements() const {
   assert_panic(!this->moved_);
   return np_ffi::internal::
       np_ffi_LegibleDeserializedV0Advertisement_get_num_des(
@@ -401,13 +423,13 @@
   return V0Payload(result);
 }
 
-V0Payload::V0Payload(V0Payload &&other) noexcept
+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 {
+V0Payload& V0Payload::operator=(V0Payload&& other) noexcept {
   if (this != &other) {
     if (!this->moved_) {
       auto result =
@@ -431,51 +453,199 @@
   }
 }
 
-absl::StatusOr<V0DataElement> V0Payload::TryGetDataElement(uint8_t index) {
+absl::StatusOr<V0DataElement> V0Payload::TryGetDataElement(
+    const uint8_t index) const {
   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");
-  }
+    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() {
+absl::StatusOr<std::vector<uint8_t>> MetadataResultToVec(
+    np_ffi::internal::DecryptMetadataResult decrypt_result) {
+  auto kind =
+      np_ffi::internal::np_ffi_DecryptMetadataResult_kind(decrypt_result);
+  switch (kind) {
+    case np_ffi::internal::DecryptMetadataResultKind::Success: {
+      auto metadata =
+          np_ffi::internal::np_ffi_DecryptMetadataResult_into_SUCCESS(
+              decrypt_result);
+      auto parts_result =
+          np_ffi::internal::np_ffi_DecryptedMetadata_get_metadata_buffer_parts(
+              metadata);
+      // The handle is guaranteed to be valid by the C++ wrapper so this should
+      // never fail
+      assert_panic(np_ffi::internal::np_ffi_GetMetadataBufferPartsResult_kind(
+                       parts_result) ==
+                   np_ffi::internal::GetMetadataBufferPartsResultKind::Success);
+      auto parts =
+          np_ffi::internal::np_ffi_GetMetadataBufferPartsResult_into_SUCCESS(
+              parts_result);
+      std::vector<uint8_t> result(parts.ptr, parts.ptr + parts.len);
+
+      // Now that the contents have been copied into the vec, the underlying
+      // handle can be de-allocated
+      auto deallocate_result =
+          np_ffi::internal::np_ffi_deallocate_DecryptedMetadata(metadata);
+      assert_panic(deallocate_result ==
+                   np_ffi::internal::DeallocateResult::Success);
+      return result;
+    }
+    case np_ffi::internal::DecryptMetadataResultKind::Error: {
+      return absl::InvalidArgumentError("Invalid V0 payload handle");
+    }
+  }
+}
+
+absl::StatusOr<DeserializedV0IdentityDetails> V0Payload::GetIdentityDetails()
+    const {
+  assert_panic(!this->moved_);
+  auto result = np_ffi::internal::np_ffi_V0Payload_get_identity_details(
+      this->v0_payload_);
+  auto kind = np_ffi::internal::np_ffi_GetV0IdentityDetailsResult_kind(result);
+  switch (kind) {
+    case np_ffi::internal::GetV0IdentityDetailsResultKind::Error: {
+      return absl::InvalidArgumentError("Invalid handle");
+    }
+    case np_ffi::internal::GetV0IdentityDetailsResultKind::Success: {
+      return np_ffi::internal::np_ffi_GetV0IdentityDetailsResult_into_SUCCESS(
+          result);
+    }
+  }
+}
+
+absl::StatusOr<std::vector<uint8_t>> V0Payload::DecryptMetadata() const {
+  assert_panic(!this->moved_);
+  auto decrypt_result =
+      np_ffi::internal::np_ffi_V0Payload_decrypt_metadata(this->v0_payload_);
+  return MetadataResultToVec(decrypt_result);
+}
+
+V0DataElementKind V0DataElement::GetKind() const {
   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_);
+TxPower V0DataElement::AsTxPower() const {
+  return TxPower(
+      np_ffi::internal::np_ffi_V0DataElement_into_TX_POWER(v0_data_element_));
 }
 
-V0Actions V0DataElement::AsActions() {
+V0Actions V0DataElement::AsActions() const {
   auto internal =
       np_ffi::internal::np_ffi_V0DataElement_into_ACTIONS(v0_data_element_);
   return V0Actions(internal);
 }
 
-uint32_t V0Actions::GetAsU32() {
+V0DataElement::V0DataElement(TxPower tx_power) {
+  v0_data_element_ =
+      np_ffi::internal::np_ffi_TxPower_into_V0DataElement(tx_power.tx_power_);
+}
+
+V0DataElement::V0DataElement(V0Actions actions) {
+  v0_data_element_ =
+      np_ffi::internal::np_ffi_V0Actions_into_V0DataElement(actions.actions_);
+}
+
+uint32_t V0Actions::GetAsU32() const {
   return np_ffi::internal::np_ffi_V0Actions_as_u32(actions_);
 }
 
-bool V0Actions::HasAction(BooleanActionType action) {
+bool V0Actions::HasAction(BooleanActionType action) const {
   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_);
+ContextSyncSeqNum V0Actions::GetContextSyncSequenceNumber() const {
+  return ContextSyncSeqNum(
+      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
+absl::Status V0Actions::TrySetAction(BooleanActionType action, bool value) {
+  auto result =
+      np_ffi::internal::np_ffi_V0Actions_set_action(actions_, action, value);
+  auto kind = np_ffi::internal::np_ffi_SetV0ActionResult_kind(result);
+  switch (kind) {
+    case np_ffi::internal::SetV0ActionResultKind::Success: {
+      actions_ =
+          np_ffi::internal::np_ffi_SetV0ActionResult_into_SUCCESS(result);
+      return absl::OkStatus();
+    }
+    case np_ffi::internal::SetV0ActionResultKind::Error: {
+      actions_ = np_ffi::internal::np_ffi_SetV0ActionResult_into_ERROR(result);
+      return absl::InvalidArgumentError(
+          "The requested action bit may not be set for the requested adv "
+          "encoding");
+    }
+  }
+}
+
+void V0Actions::SetContextSyncSequenceNumber(ContextSyncSeqNum seq_num) {
+  actions_ =
+      np_ffi::internal::np_ffi_V0Actions_set_context_sync_sequence_number(
+          actions_, seq_num.seq_num_);
+}
+
+V0Actions V0Actions::BuildNewZeroed(AdvertisementBuilderKind kind) {
+  auto actions = np_ffi::internal::np_ffi_build_new_zeroed_V0Actions(kind);
+  return V0Actions(actions);
+}
+
+uint8_t ContextSyncSeqNum::GetAsU8() const {
+  return np_ffi::internal::np_ffi_ContextSyncSeqNum_as_unsigned_byte(seq_num_);
+}
+
+absl::StatusOr<ContextSyncSeqNum> ContextSyncSeqNum::TryBuildFromU8(
+    uint8_t value) {
+  auto result =
+      np_ffi::internal::np_ffi_ContextSyncSeqNum_build_from_unsigned_byte(
+          value);
+  auto kind =
+      np_ffi::internal::np_ffi_BuildContextSyncSeqNumResult_kind(result);
+  switch (kind) {
+    case np_ffi::internal::BuildContextSyncSeqNumResultKind::Success: {
+      return ContextSyncSeqNum(
+          np_ffi::internal::np_ffi_BuildContextSyncSeqNumResult_into_SUCCESS(
+              result));
+    }
+    case np_ffi::internal::BuildContextSyncSeqNumResultKind::OutOfRange: {
+      return absl::InvalidArgumentError(
+          "Attempted to build a context sync sequence number from a non-nibble "
+          "value.");
+    }
+  }
+}
+
+int8_t TxPower::GetAsI8() const {
+  return np_ffi::internal::np_ffi_TxPower_as_signed_byte(tx_power_);
+}
+
+absl::StatusOr<TxPower> TxPower::TryBuildFromI8(int8_t value) {
+  auto result = np_ffi::internal::np_ffi_TxPower_build_from_signed_byte(value);
+  auto kind = np_ffi::internal::np_ffi_BuildTxPowerResult_kind(result);
+  switch (kind) {
+    case np_ffi::internal::BuildTxPowerResultKind::Success: {
+      return TxPower(
+          np_ffi::internal::np_ffi_BuildTxPowerResult_into_SUCCESS(result));
+    }
+    case np_ffi::internal::BuildTxPowerResultKind::OutOfRange: {
+      return absl::InvalidArgumentError(
+          "Could not build a tx power for the requested byte value.");
+    }
+  }
+}
+
+// This is called after all references to the shared_ptr have gone out of
+// scope
 auto DeallocateV1Adv(
-    np_ffi::internal::DeserializedV1Advertisement *v1_advertisement) {
+    np_ffi::internal::DeserializedV1Advertisement* v1_advertisement) {
   auto result =
       np_ffi::internal::np_ffi_deallocate_deserialized_V1_advertisement(
           *v1_advertisement);
@@ -492,11 +662,11 @@
 }
 
 DeserializedV1Advertisement::DeserializedV1Advertisement(
-    DeserializedV1Advertisement &&other) noexcept
+    DeserializedV1Advertisement&& other) noexcept
     : v1_advertisement_(std::move(other.v1_advertisement_)) {}
 
-DeserializedV1Advertisement &DeserializedV1Advertisement::operator=(
-    DeserializedV1Advertisement &&other) noexcept {
+DeserializedV1Advertisement& DeserializedV1Advertisement::operator=(
+    DeserializedV1Advertisement&& other) noexcept {
   if (this != &other) {
     this->v1_advertisement_ = std::move(other.v1_advertisement_);
   }
@@ -504,14 +674,14 @@
 }
 
 // V1 Stuff
-uint8_t DeserializedV1Advertisement::GetNumLegibleSections() {
+uint8_t DeserializedV1Advertisement::GetNumLegibleSections() const {
   assert_panic(this->v1_advertisement_ != nullptr);
   return np_ffi::internal::
       np_ffi_DeserializedV1Advertisement_get_num_legible_sections(
           *v1_advertisement_);
 }
 
-uint8_t DeserializedV1Advertisement::GetNumUndecryptableSections() {
+uint8_t DeserializedV1Advertisement::GetNumUndecryptableSections() const {
   assert_panic(this->v1_advertisement_ != nullptr);
   return np_ffi::internal::
       np_ffi_DeserializedV1Advertisement_get_num_undecryptable_sections(
@@ -519,72 +689,127 @@
 }
 
 absl::StatusOr<DeserializedV1Section>
-DeserializedV1Advertisement::TryGetSection(uint8_t section_index) {
+DeserializedV1Advertisement::TryGetSection(const uint8_t section_index) const {
   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_);
-  }
+    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() {
+uint8_t DeserializedV1Section::NumberOfDataElements() const {
   return np_ffi::internal::np_ffi_DeserializedV1Section_get_num_des(section_);
 }
 
-DeserializedV1IdentityKind DeserializedV1Section::GetIdentityKind() {
+DeserializedV1IdentityKind DeserializedV1Section::GetIdentityKind() const {
   return np_ffi::internal::np_ffi_DeserializedV1Section_get_identity_kind(
       section_);
 }
 
-absl::StatusOr<V1DataElement>
-DeserializedV1Section::TryGetDataElement(uint8_t index) {
+absl::StatusOr<V1DataElement> DeserializedV1Section::TryGetDataElement(
+    const uint8_t index) const {
   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::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));
+    }
   }
-  case np_ffi::internal::GetV1DEResultKind::Success: {
-    return V1DataElement(
-        np_ffi::internal::np_ffi_GetV1DEResult_into_SUCCESS(result));
+}
+
+absl::StatusOr<std::vector<uint8_t>> DeserializedV1Section::DecryptMetadata()
+    const {
+  assert_panic(this->owning_v1_advertisement_ != nullptr);
+  auto decrypt_result =
+      np_ffi::internal::np_ffi_DeserializedV1Section_decrypt_metadata(
+          this->section_);
+  return MetadataResultToVec(decrypt_result);
+}
+
+absl::StatusOr<DeserializedV1IdentityDetails>
+DeserializedV1Section::GetIdentityDetails() const {
+  assert_panic(this->owning_v1_advertisement_ != nullptr);
+  auto result =
+      np_ffi::internal::np_ffi_DeserializedV1Section_get_identity_details(
+          this->section_);
+  auto kind = np_ffi::internal::np_ffi_GetV1IdentityDetailsResult_kind(result);
+  switch (kind) {
+    case np_ffi::internal::GetV1IdentityDetailsResultKind::Error: {
+      return absl::InvalidArgumentError("Invalid handle");
+    }
+    case np_ffi::internal::GetV1IdentityDetailsResultKind::Success: {
+      return np_ffi::internal::np_ffi_GetV1IdentityDetailsResult_into_SUCCESS(
+          result);
+    }
   }
+}
+
+absl::StatusOr<std::array<uint8_t, DERIVED_SALT_SIZE>>
+DeserializedV1Section::DeriveSaltForOffset(const uint8_t offset) const {
+  auto result = np_ffi::internal::
+      np_ffi_DeserializedV1Section_derive_16_byte_salt_for_offset(
+          this->section_, offset);
+  auto kind = np_ffi::internal::np_ffi_GetV1DE16ByteSaltResult_kind(result);
+  switch (kind) {
+    case np_ffi::internal::GetV1DE16ByteSaltResultKind::Error: {
+      return absl::InvalidArgumentError("Failed to derive salt for offset");
+    }
+    case np_ffi::internal::GetV1DE16ByteSaltResultKind::Success: {
+      auto buffer =
+          np_ffi::internal::np_ffi_GetV1DE16ByteSaltResult_into_SUCCESS(result);
+      return std::to_array(buffer._0);
+    }
   }
 }
 
 uint32_t V1DataElement::GetDataElementTypeCode() const {
   return np_ffi::internal::np_ffi_V1DEType_to_uint32_t(
-      v1_data_element_.generic._0.de_type);
+      np_ffi::internal::np_ffi_V1DataElement_to_generic(this->v1_data_element_)
+          .de_type);
 }
 
-ByteBuffer<127> V1DataElement::GetPayload() const {
-  return ByteBuffer(v1_data_element_.generic._0.payload);
+ByteBuffer<MAX_V1_DE_PAYLOAD_SIZE> V1DataElement::GetPayload() const {
+  return ByteBuffer(
+      np_ffi::internal::np_ffi_V1DataElement_to_generic(this->v1_data_element_)
+          .payload);
+}
+
+uint8_t V1DataElement::GetOffset() const {
+  return np_ffi::internal::np_ffi_V1DataElement_to_generic(
+             this->v1_data_element_)
+      .offset;
 }
 
 MatchedCredentialData::MatchedCredentialData(
-    uint32_t cred_id, std::span<uint8_t> metadata_bytes) {
+    const uint32_t cred_id, std::span<const uint8_t> metadata_bytes) {
   this->data_ = {cred_id, metadata_bytes.data(), metadata_bytes.size()};
 }
 
 template <typename T, size_t N>
-static void CopyToRawArray(T (&dest)[N], const std::array<T, N> &src) {
+void CopyToRawArray(T (&dest)[N], const std::array<T, N>& src) {
   memcpy(dest, src.data(), sizeof(T) * N);
 }
 
 V0MatchableCredential::V0MatchableCredential(
-    std::array<uint8_t, 32> key_seed,
-    std::array<uint8_t, 32> legacy_metadata_key_hmac,
-    MatchedCredentialData matched_credential_data) {
+    const std::array<uint8_t, 32> key_seed,
+    const std::array<uint8_t, 32> legacy_metadata_key_hmac,
+    const MatchedCredentialData matched_credential_data) {
   np_ffi::internal::V0DiscoveryCredential discovery_cred{};
   CopyToRawArray(discovery_cred.key_seed, key_seed);
   CopyToRawArray(discovery_cred.legacy_metadata_key_hmac,
@@ -593,11 +818,11 @@
 }
 
 V1MatchableCredential::V1MatchableCredential(
-    std::array<uint8_t, 32> key_seed,
-    std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac,
-    std::array<uint8_t, 32> expected_signed_metadata_key_hmac,
-    std::array<uint8_t, 32> pub_key,
-    MatchedCredentialData matched_credential_data) {
+    const std::array<uint8_t, 32> key_seed,
+    const std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac,
+    const std::array<uint8_t, 32> expected_signed_metadata_key_hmac,
+    const std::array<uint8_t, 32> pub_key,
+    const MatchedCredentialData matched_credential_data) {
   np_ffi::internal::V1DiscoveryCredential discovery_cred{};
   CopyToRawArray(discovery_cred.key_seed, key_seed);
   CopyToRawArray(discovery_cred.expected_unsigned_metadata_key_hmac,
@@ -607,4 +832,145 @@
   CopyToRawArray(discovery_cred.pub_key, pub_key);
   this->internal_ = {discovery_cred, matched_credential_data.data_};
 }
-} // namespace nearby_protocol
+
+V0BroadcastCredential::V0BroadcastCredential(
+    std::array<uint8_t, 32> key_seed, std::array<uint8_t, 14> metadata_key) {
+  CopyToRawArray(internal_.key_seed, key_seed);
+  CopyToRawArray(internal_.metadata_key, metadata_key);
+}
+
+V0AdvertisementBuilder::~V0AdvertisementBuilder() {
+  if (!this->moved_) {
+    auto result = np_ffi::internal::np_ffi_deallocate_v0_advertisement_builder(
+        adv_builder_);
+    assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+  }
+}
+
+V0AdvertisementBuilder::V0AdvertisementBuilder(
+    V0AdvertisementBuilder&& other) noexcept
+    : adv_builder_(other.adv_builder_), moved_(other.moved_) {
+  other.adv_builder_ = {};
+  other.moved_ = true;
+}
+
+V0AdvertisementBuilder& V0AdvertisementBuilder::operator=(
+    V0AdvertisementBuilder&& other) noexcept {
+  if (this != &other) {
+    if (!this->moved_) {
+      auto result =
+          np_ffi::internal::np_ffi_deallocate_v0_advertisement_builder(
+              this->adv_builder_);
+      assert_panic(result == np_ffi::internal::DeallocateResult::Success);
+    }
+
+    this->adv_builder_ = other.adv_builder_;
+    this->moved_ = other.moved_;
+
+    other.adv_builder_ = {};
+    other.moved_ = true;
+  }
+  return *this;
+}
+
+absl::Status V0AdvertisementBuilder::TryAddDE(V0DataElement de) {
+  assert_panic(!this->moved_);
+  auto result = np_ffi::internal::np_ffi_V0AdvertisementBuilder_add_de(
+      this->adv_builder_, de.v0_data_element_);
+  switch (result) {
+    case AddV0DEResult::Success: {
+      return absl::OkStatus();
+    }
+    case AddV0DEResult::InvalidAdvertisementBuilderHandle: {
+      return absl::InvalidArgumentError(
+          "invalid v0 advertisement builder handle provided");
+    }
+    case AddV0DEResult::InsufficientAdvertisementSpace: {
+      return absl::ResourceExhaustedError(
+          "insufficient advertisement space to add DE");
+    }
+    case AddV0DEResult::InvalidIdentityTypeForDataElement: {
+      return absl::InvalidArgumentError(
+          "the DE may not be added to this advertisement builder due to an "
+          "identity type mismatch");
+    }
+  }
+}
+
+[[nodiscard]] absl::StatusOr<ByteBuffer<24>>
+V0AdvertisementBuilder::TrySerialize() {
+  assert_panic(!this->moved_);
+  auto result =
+      np_ffi::internal::np_ffi_V0AdvertisementBuilder_into_advertisement(
+          this->adv_builder_);
+  auto kind =
+      np_ffi::internal::np_ffi_SerializeV0AdvertisementResult_kind(result);
+  // Regardless of what happens, we've invalidated the original adv builder.
+  this->moved_ = true;
+
+  switch (kind) {
+    case SerializeV0AdvertisementResultKind::Success: {
+      auto bytes =
+          np_ffi::internal::np_ffi_SerializeV0AdvertisementResult_into_SUCCESS(
+              result);
+      return ByteBuffer(bytes);
+    }
+    case SerializeV0AdvertisementResultKind::LdtError: {
+      return absl::OutOfRangeError(
+          "The advertisement contents were not of a proper size for LDT "
+          "encryption");
+    }
+    case SerializeV0AdvertisementResultKind::
+        InvalidAdvertisementBuilderHandle: {
+      return absl::InvalidArgumentError(
+          "The advertisement builder handle was invalid");
+    }
+  }
+}
+
+[[nodiscard]] absl::StatusOr<V0AdvertisementBuilder>
+V0AdvertisementBuilder::CreateV0AdvertisementBuilderResultToInternal(
+    np_ffi::internal::CreateV0AdvertisementBuilderResult result) {
+  auto kind =
+      np_ffi::internal::np_ffi_CreateV0AdvertisementBuilderResult_kind(result);
+  switch (kind) {
+    case CreateV0AdvertisementBuilderResultKind::Success: {
+      auto adv_builder = np_ffi::internal::
+          np_ffi_CreateV0AdvertisementBuilderResult_into_SUCCESS(result);
+      return V0AdvertisementBuilder(adv_builder);
+    }
+    case CreateV0AdvertisementBuilderResultKind::NoSpaceLeft: {
+      return absl::ResourceExhaustedError(
+          "No space left to create v0 advertisement builder");
+    }
+  }
+}
+
+[[nodiscard]] absl::StatusOr<V0AdvertisementBuilder>
+V0AdvertisementBuilder::TryCreatePublic() {
+  auto result =
+      np_ffi::internal::np_ffi_create_v0_public_advertisement_builder();
+  return V0AdvertisementBuilder::CreateV0AdvertisementBuilderResultToInternal(
+      result);
+}
+
+template <uintptr_t N>
+[[nodiscard]] np_ffi::internal::FixedSizeArray<N> ToFFIArray(
+    std::array<uint8_t, N> value) {
+  np_ffi::internal::FixedSizeArray<N> result;
+  std::copy(std::begin(value), std::end(value), result._0);
+  return result;
+}
+
+[[nodiscard]] absl::StatusOr<V0AdvertisementBuilder>
+V0AdvertisementBuilder::TryCreateEncrypted(V0BroadcastCredential broadcast_cred,
+                                           EncryptedIdentityType identity_type,
+                                           std::array<uint8_t, 2> salt) {
+  auto result =
+      np_ffi::internal::np_ffi_create_v0_encrypted_advertisement_builder(
+          broadcast_cred.internal_, identity_type, ToFFIArray(salt));
+  return V0AdvertisementBuilder::CreateV0AdvertisementBuilderResultToInternal(
+      result);
+}
+
+}  // namespace nearby_protocol
\ No newline at end of file

diff --git a/nearby/presence/np_cpp_ffi/sample/main.cc b/nearby/presence/np_cpp_ffi/sample/main.cc
index 1d273da..eb0cae0 100644
--- a/nearby/presence/np_cpp_ffi/sample/main.cc
+++ b/nearby/presence/np_cpp_ffi/sample/main.cc

@@ -12,12 +12,11 @@
 // 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"
+#include "nearby_protocol.h"
 
 static void SamplePanicHandler(nearby_protocol::PanicReason reason);
 
@@ -54,19 +53,21 @@
   }
 
   // Create an empty credential book from the empty slab, and verify success.
-  auto cred_book_result = nearby_protocol::CredentialBook::TryCreateFromSlab(cred_slab_result.value());
+  auto cred_book_result = nearby_protocol::CredentialBook::TryCreateFromSlab(
+      cred_slab_result.value());
   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_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);
+  auto v0_buffer = nearby_protocol::ByteBuffer<255>::TryFromString(v0_bytes);
   nearby_protocol::RawAdvertisementPayload v0_payload(v0_buffer.value());
 
   // Try to deserialize a V0 payload
@@ -78,13 +79,14 @@
   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
+  auto v1_byte_string =
+      "20"       // V1 Advertisement header
+      "04"       // Section Header
+      "03"       // Public Identity DE header
+      "260046";  // Length 2 Actions DE
 
   auto v1_bytes = absl::HexStringToBytes(v1_byte_string);
-  auto v1_buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(v1_bytes);
+  auto v1_buffer = nearby_protocol::ByteBuffer<255>::TryFromString(v1_bytes);
   nearby_protocol::RawAdvertisementPayload v1_payload(v1_buffer.value());
 
   // Try to deserialize a V1 payload
@@ -100,7 +102,7 @@
                  "(see above examples): ";
     std::cin >> user_input;
     auto bytes = absl::HexStringToBytes(user_input);
-    auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+    auto buffer = nearby_protocol::ByteBuffer<255>::TryFromString(bytes);
     if (!buffer.ok()) {
       std::cout << "Too many bytes provided, must fit into a max length 255 "
                    "byte BLE advertisement\n";
@@ -129,18 +131,18 @@
 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 nearby_protocol::PanicReason::InvalidActionBits: {
-    std::cout << "InvalidActionBits \n";
-    break;
-  }
+    case nearby_protocol::PanicReason::EnumCastFailed: {
+      std::cout << "EnumCastFailed \n";
+      break;
+    }
+    case nearby_protocol::PanicReason::AssertFailed: {
+      std::cout << "AssertFailed \n";
+      break;
+    }
+    case nearby_protocol::PanicReason::InvalidStackDataStructure: {
+      std::cout << "InvalidStackDataStructure \n";
+      break;
+    }
   }
   std::abort();
 }
@@ -148,29 +150,30 @@
 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;
+    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;
+    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;
   }
 }
 
@@ -192,34 +195,35 @@
   }
 }
 
-void HandleV0IdentityKind(nearby_protocol::DeserializedV0IdentityKind identity) {
+void HandleV0IdentityKind(
+    nearby_protocol::DeserializedV0IdentityKind identity) {
   switch (identity) {
-  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;
-  }
+    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;
-  }
+    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.GetAsI8()) << "\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;
+    }
   }
 }
 
@@ -245,14 +249,14 @@
 
 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;
-  }
+    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();

diff --git a/nearby/presence/np_cpp_ffi/shared/shared_test_util.cc b/nearby/presence/np_cpp_ffi/shared/shared_test_util.cc
index 67ca828..8f172c1 100644
--- a/nearby/presence/np_cpp_ffi/shared/shared_test_util.cc
+++ b/nearby/presence/np_cpp_ffi/shared/shared_test_util.cc

@@ -12,22 +12,23 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "nearby_protocol.h"
+#include "shared_test_util.h"
 
 #include <cstdlib>
-#include <cstddef> // IWYU pragma: keep
+
+#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 nearby_protocol::PanicReason::InvalidActionBits: {
-    return "InvalidActionBits";
-  }
+    case nearby_protocol::PanicReason::EnumCastFailed: {
+      return "EnumCastFailed";
+    }
+    case nearby_protocol::PanicReason::AssertFailed: {
+      return "AssertFailed";
+    }
+    case nearby_protocol::PanicReason::InvalidStackDataStructure: {
+      return "InvalidStackDataStructure";
+    }
   }
 }
 
@@ -37,17 +38,37 @@
 }
 
 std::string generate_hex_string(const size_t length) {
-  char *str = new char[length];
+  std::string result;
+  result.reserve(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)
+
+  for (size_t i = 0; i < length; i++) {
+    result.push_back(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
+}
+
+nearby_protocol::V0MatchableCredential GenerateRandomCredentialV0() {
+  auto key_seed = create_random_array<32>();
+  auto legacy_metadata_key_hmac = create_random_array<32>();
+  auto encrypted_metadata_bytes = create_random_array<200>();
+  nearby_protocol::MatchedCredentialData matched_cred(rand(),
+                                                      encrypted_metadata_bytes);
+  return {key_seed, legacy_metadata_key_hmac, matched_cred};
+}
+
+nearby_protocol::V1MatchableCredential GenerateRandomCredentialV1() {
+  auto key_seed = create_random_array<32>();
+  auto expected_unsigned_metadata_key_hmac = create_random_array<32>();
+  auto expected_signed_metadata_key_hmac = create_random_array<32>();
+  auto pub_key = create_random_array<32>();
+  auto encrypted_metadata_bytes = create_random_array<200>();
+  nearby_protocol::MatchedCredentialData matched_cred(rand(),
+                                                      encrypted_metadata_bytes);
+  return {key_seed, expected_unsigned_metadata_key_hmac,
+          expected_signed_metadata_key_hmac, pub_key, matched_cred};
+}

diff --git a/nearby/presence/np_cpp_ffi/shared/shared_test_util.h b/nearby/presence/np_cpp_ffi/shared/shared_test_util.h
index 22d1bb3..da57b63 100644
--- a/nearby/presence/np_cpp_ffi/shared/shared_test_util.h
+++ b/nearby/presence/np_cpp_ffi/shared/shared_test_util.h

@@ -17,28 +17,131 @@
 
 #include "nearby_protocol.h"
 
-inline nearby_protocol::RawAdvertisementPayload
-    V0AdvEmpty(nearby_protocol::ByteBuffer<255>({2, {0x00, 0x03}}));
+// Plaintext advertisement bytes
+constexpr std::array<uint8_t, 2> V0AdvEmptyBytes{0x00, 0x03};
+constexpr std::array<uint8_t, 2> V1AdvEmptyBytes{0x00, 0x20};
+constexpr std::array<uint8_t, 4> V0AdvPlaintextBytes{0x00, 0x03, 0x15, 0x03};
+constexpr std::array<uint8_t, 7> V0AdvPlaintextMultiDeBytes{
+    0x00, 0x03, 0x15, 0x05, 0x26, 0x00, 0x46,
+};
+constexpr std::array<uint8_t, 5> V1AdvPlaintextBytes{0x20, 0x03, 0x03, 0x15,
+                                                     0x03};
 
-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
-    }));
+// V0 encrypted advertisement data - ripped out of np_adv/tests/examples_v0.rs
+constexpr std::array<uint8_t, 20> V0AdvEncryptedBytes{
+    0x00, 0x21, 0x22, 0x22, 0x85, 0xBF, 0xA8, 0x83, 0x58, 0x7C,
+    0x50, 0xCF, 0x98, 0x38, 0xA7, 0x8A, 0xC0, 0x1C, 0x96, 0xF9,
+};
+inline std::vector<uint8_t> V0AdvEncryptedMetadata = {
+    0x26, 0xC5, 0xEA, 0xD4, 0xED, 0x58, 0xF8, 0xFC, 0xE8, 0xF4, 0xAB, 0x0C,
+    0x93, 0x2B, 0x75, 0xAA, 0x74, 0x39, 0x67, 0xDB, 0x1E, 0xF2, 0x33, 0xB5,
+    0x43, 0xCC, 0x94, 0xAA, 0xA3, 0xBB, 0xB9, 0x4C, 0xBF, 0x57, 0x77, 0xD0,
+    0x43, 0x0C, 0x7F, 0xF7, 0x36, 0x03, 0x29, 0xE0, 0x57, 0xBA, 0x97, 0x7F,
+    0xF2, 0xD1, 0x51, 0xDB, 0xC9, 0x01, 0x47, 0xE7, 0x48, 0x36,
+};
+inline std::string ExpectedV0DecryptedMetadata(
+    R"({"name":"Alice","email":"alice@gmail.com"})");
+constexpr std::array<uint8_t, 32> V0AdvKeySeed = {
+    0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+    0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+    0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+};
+constexpr std::array<uint8_t, 32> V0AdvLegacyMetadataKeyHmac = {
+    0x88, 0x33, 0xDE, 0xD5, 0x4D, 0x00, 0x92, 0xE8, 0x80, 0x70, 0xD5,
+    0x1F, 0x18, 0xEC, 0x22, 0x45, 0x75, 0x7C, 0x24, 0xDF, 0xE3, 0x8C,
+    0xB2, 0xDE, 0x77, 0xB6, 0x78, 0x85, 0xFC, 0xA5, 0x67, 0x4D,
+};
 
-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
-         }}));
+// V1 encrypted advertisement data - ripped out of np_adv/tests/examples_v1.rs
+constexpr std::array<uint8_t, 105> V1AdvEncryptedBytes{
+    0x20, 0x67, 0x91, 0x10, 0x08, 0xAD, 0x69, 0x46, 0x04, 0x5D, 0xAE, 0x6D,
+    0xB7, 0xF7, 0x5C, 0xD3, 0xB8, 0xAC, 0xF0, 0xBF, 0x75, 0x90, 0x01, 0xBE,
+    0x73, 0x33, 0xA4, 0x76, 0x84, 0x4A, 0x09, 0x0F, 0x2B, 0x99, 0x47, 0xDF,
+    0x8B, 0x46, 0xCA, 0x16, 0xCE, 0x13, 0xB5, 0x6E, 0x53, 0xAE, 0x28, 0x56,
+    0x44, 0x0E, 0xA6, 0x8D, 0xEB, 0xA1, 0x11, 0xAF, 0x4E, 0x1B, 0xE0, 0x8E,
+    0xF5, 0xBA, 0x90, 0x4F, 0x2E, 0x94, 0xFC, 0xDE, 0xA6, 0x7F, 0x5D, 0xC8,
+    0x37, 0xB7, 0xEF, 0xCA, 0xAC, 0x8B, 0x9F, 0x1B, 0xD4, 0xC6, 0x11, 0x85,
+    0xD3, 0x67, 0x39, 0x32, 0xD1, 0x82, 0xCA, 0x4E, 0xB9, 0x46, 0x03, 0x83,
+    0x68, 0x56, 0x0B, 0xCC, 0xFD, 0x7A, 0x2A, 0xBE, 0x07,
+};
+constexpr std::array<uint8_t, 32> V1AdvKeySeed = {
+    0x31, 0x43, 0x63, 0x1E, 0xCA, 0xE8, 0x97, 0x4B, 0x96, 0x50, 0xCC,
+    0x1C, 0x48, 0x25, 0x0E, 0x81, 0x58, 0x06, 0x81, 0x51, 0xF9, 0xEB,
+    0x25, 0x23, 0x03, 0xD4, 0x97, 0x6D, 0x95, 0x19, 0x91, 0x39,
+};
+constexpr std::array<uint8_t, 32> V1AdvExpectedUnsignedMetadataKeyHmac = {0};
+constexpr std::array<uint8_t, 32> V1AdvExpectedSignedMetadataKeyHmac = {
+    0x1C, 0xBC, 0xEB, 0xDC, 0x17, 0xB5, 0x91, 0xE5, 0x07, 0x9D, 0x70,
+    0xC1, 0xE8, 0x4B, 0xCC, 0xDB, 0x4B, 0x0F, 0x76, 0x83, 0x59, 0x62,
+    0x0A, 0x2D, 0x55, 0x0B, 0x3B, 0x36, 0xA4, 0x92, 0x8B, 0x13,
+};
+constexpr std::array<uint8_t, 32> V1AdvPublicKey = {
+    0x6D, 0x0D, 0xB6, 0x09, 0x10, 0xB1, 0x4E, 0xC4, 0x7E, 0x10, 0x16,
+    0x14, 0x9C, 0x9F, 0xF2, 0x14, 0x0F, 0xEC, 0x53, 0x76, 0xE3, 0x07,
+    0xD9, 0xD3, 0x9E, 0xAE, 0xE7, 0x45, 0x2C, 0x03, 0xEC, 0x6D,
+};
+inline std::vector<uint8_t> V1AdvEncryptedMetadata = {
+    0x09, 0xB8, 0xC6, 0x6B, 0x71, 0x43, 0x55, 0x4C, 0xB9, 0x9D, 0xBF,
+    0xE4, 0xAF, 0x3E, 0xA2, 0x56, 0x0E, 0x6C, 0xBC, 0xDC, 0x3F, 0x3F,
+    0x0D, 0x28, 0xD4, 0x50, 0xA9, 0xEA, 0xC3, 0x60, 0xB0, 0x81, 0x31,
+    0xE2, 0x67, 0xB5, 0xC8, 0x15, 0x0C, 0xCA, 0x0B, 0x9B, 0x2C, 0x80,
+    0xC1, 0xB1, 0xF6, 0x5F, 0xE1, 0x51, 0xF9, 0xE2, 0x23, 0x56, 0xD4,
+    0x0B, 0x89, 0xA7, 0xF3, 0x4D, 0xE8, 0x79, 0x26, 0x44, 0x7E, 0x62,
+    0xDE, 0x53, 0x13, 0x15, 0x3D, 0xFC, 0x04, 0x2E, 0x2D, 0x08, 0x43,
+    0x2E, 0xE1, 0x96, 0xE8, 0x0F, 0xD0, 0xFC, 0xDE, 0x03, 0x86, 0x23,
+    0xB6, 0x98, 0x85, 0x27, 0x67, 0xD8, 0x1D, 0xC3, 0xE2, 0xE0, 0xA4,
+    0x32, 0x1A, 0x5F, 0x51, 0x0B, 0xA8, 0xD8, 0xA7, 0x23, 0xA4, 0x57,
+};
+inline std::string ExpectedV1DecryptedMetadata(
+    "{\"uuid\":\"378845e1-2616-420d-86f5-674177a7504d\","
+    "\"display_name\":\"Alice\",\"location\":\"Wonderland\"}");
+
+// Data suitable for use directly through the C API (bypassing the C++ wrapper)
+constexpr np_ffi::internal::RawAdvertisementPayload V0AdvMultiDeInternals{
+    {7, {0x00, 0x03, 0x15, 0x05, 0x26, 0x00, 0x46}}};
+
+// Wrapper types directly usable by C++ API
+constexpr nearby_protocol::ByteBuffer<255> V0AdvEmptyBuffer(V0AdvEmptyBytes);
+constexpr nearby_protocol::RawAdvertisementPayload V0AdvEmpty(V0AdvEmptyBuffer);
+
+constexpr nearby_protocol::ByteBuffer<255> V0AdvPlaintextBuffer(
+    V0AdvPlaintextBytes);
+constexpr nearby_protocol::RawAdvertisementPayload V0AdvPlaintext(
+    V0AdvPlaintextBuffer);
+
+constexpr nearby_protocol::ByteBuffer<255> V0AdvPlaintextMultiDeBuffer(
+    V0AdvPlaintextMultiDeBytes);
+constexpr nearby_protocol::RawAdvertisementPayload V0AdvPlaintextMultiDe(
+    V0AdvPlaintextMultiDeBuffer);
+
+constexpr nearby_protocol::ByteBuffer<255> V1AdvPlaintextBuffer(
+    V1AdvPlaintextBytes);
+constexpr nearby_protocol::RawAdvertisementPayload V1AdvPlaintext(
+    V1AdvPlaintextBuffer);
+
+constexpr nearby_protocol::ByteBuffer<255> V0AdvEncryptedBuffer(
+    V0AdvEncryptedBytes);
+constexpr nearby_protocol::RawAdvertisementPayload V0AdvEncryptedPayload(
+    V0AdvEncryptedBuffer);
+
+constexpr nearby_protocol::ByteBuffer<255> V1AdvEncryptedBuffer(
+    V1AdvEncryptedBytes);
+constexpr nearby_protocol::RawAdvertisementPayload V1AdvEncrypted(
+    V1AdvEncryptedBuffer);
+
 void test_panic_handler(nearby_protocol::PanicReason reason);
 
+nearby_protocol::V0MatchableCredential GenerateRandomCredentialV0();
+
+nearby_protocol::V1MatchableCredential GenerateRandomCredentialV1();
+
+template <uint32_t N>
+std::array<uint8_t, N> create_random_array() {
+  std::array<uint8_t, N> array{};
+  std::generate(array.begin(), array.end(), []() { return rand(); });
+  return array;
+}
+
 std::string generate_hex_string(size_t length);
 
-#endif // NEARBY_PRESENCE_NP_CPP_FFI_TESTS_SHARED_TEST_UTILS_H_
+#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
index 23d02a4..80fdee0 100644
--- a/nearby/presence/np_cpp_ffi/tests/CMakeLists.txt
+++ b/nearby/presence/np_cpp_ffi/tests/CMakeLists.txt

@@ -14,14 +14,18 @@
 
 add_executable(
         np_ffi_tests
-        deserialize_result_tests.cc
-        deserialize_v0_tests.cc
-        deserialize_v1_tests.cc
-        credential_slab_tests.cc
-        credential_book_tests.cc
         byte_buffer_tests.cc
+        credential_book_tests.cc
+        credential_slab_tests.cc
+        deserialize_result_tests.cc
         np_cpp_test.h
         np_cpp_test.cc
+	v0_encrypted_deserialization_tests.cc
+	v0_encrypted_serialization_tests.cc
+	v0_unencrypted_deserialization_tests.cc
+	v0_unencrypted_serialization_tests.cc
+	v1_encrypted_deserialization_tests.cc
+	v1_unencrypted_deserialization_tests.cc
 )
 
 target_link_libraries(

diff --git a/nearby/presence/np_cpp_ffi/tests/byte_buffer_tests.cc b/nearby/presence/np_cpp_ffi/tests/byte_buffer_tests.cc
index 7e1a048..f76f396 100644
--- a/nearby/presence/np_cpp_ffi/tests/byte_buffer_tests.cc
+++ b/nearby/presence/np_cpp_ffi/tests/byte_buffer_tests.cc

@@ -12,64 +12,116 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <array>
+#include <cassert>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+#include "absl/strings/escaping.h"
+#include "gtest/gtest.h"
 #include "nearby_protocol.h"
 #include "np_cpp_test.h"
 #include "shared_test_util.h"
 
-#include "absl/strings/escaping.h"
-#include "gtest/gtest.h"
-
+// NOLINTBEGIN(readability-magic-numbers)
 TEST_F(NpCppTest, 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);
+  auto buffer = nearby_protocol::ByteBuffer<
+      nearby_protocol::MAX_ADV_PAYLOAD_SIZE>::TryFromString(bytes);
   ASSERT_TRUE(buffer.ok());
   auto string = buffer.value().ToString();
   ASSERT_EQ(bytes, string);
 }
 
+TEST_F(NpCppTest, ByteBufferArrayConstructor) {
+  const std::array<uint8_t, 3> data{1, 2, 3};
+  const nearby_protocol::ByteBuffer<nearby_protocol::MAX_ADV_PAYLOAD_SIZE>
+      buffer(data);
+  const std::vector<uint8_t> expected{1, 2, 3};
+  ASSERT_EQ(expected, buffer.ToVector());
+}
+
+TEST_F(NpCppTest, ByteBufferTryFromSpan) {
+  std::vector<uint8_t> data{1, 2, 3};
+  auto buffer = nearby_protocol::ByteBuffer<3>::TryFromSpan(data);
+  assert(buffer.ok());
+  ASSERT_EQ(data, buffer->ToVector());
+}
+
+TEST_F(NpCppTest, ByteBufferTryFromSpanBufferNotFull) {
+  std::vector<uint8_t> data{1, 2, 3};
+  auto buffer = nearby_protocol::ByteBuffer<100>::TryFromSpan(data);
+  assert(buffer.ok());
+  ASSERT_EQ(data, buffer->ToVector());
+}
+
+TEST_F(NpCppTest, ByteBufferTryFromSpanInvalidLength) {
+  std::vector<uint8_t> data{1, 2, 3};
+  auto buffer = nearby_protocol::ByteBuffer<2>::TryFromSpan(data);
+  ASSERT_FALSE(buffer.ok());
+}
+
+TEST_F(NpCppTest, ByteBufferTryFromSpanArray) {
+  const std::array<uint8_t, 3> data{1, 2, 3};
+  auto buffer = nearby_protocol::ByteBuffer<
+      nearby_protocol::MAX_ADV_PAYLOAD_SIZE>::TryFromSpan(data);
+  const std::vector<uint8_t> expected{1, 2, 3};
+  ASSERT_EQ(expected, buffer->ToVector());
+}
+
+TEST_F(NpCppTest, ByteBufferTryFromSpanArrayInvalid) {
+  std::array<uint8_t, 3> data{1, 2, 3};
+  auto buffer = nearby_protocol::ByteBuffer<2>::TryFromSpan(data);
+  ASSERT_FALSE(buffer.ok());
+}
+
 TEST_F(NpCppTest, 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);
+  auto buffer = nearby_protocol::ByteBuffer<
+      nearby_protocol::MAX_ADV_PAYLOAD_SIZE>::TryFromString(bytes);
   ASSERT_FALSE(buffer.ok());
 }
 
 TEST_F(NpCppTest, ByteBufferRoundTrip) {
   auto bytes = absl::HexStringToBytes("2003031503");
-  auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+  auto buffer = nearby_protocol::ByteBuffer<
+      nearby_protocol::MAX_ADV_PAYLOAD_SIZE>::TryFromString(bytes);
   auto string = buffer.value().ToString();
   ASSERT_EQ(bytes, string);
 }
 
 TEST_F(NpCppTest, ByteBufferPayloadWrongSize) {
   auto bytes = absl::HexStringToBytes("1111111111111111111111");
-  auto buffer = nearby_protocol::ByteBuffer<10>::CopyFrom(bytes);
+  auto buffer = nearby_protocol::ByteBuffer<10>::TryFromString(bytes);
   ASSERT_FALSE(buffer.ok());
 }
 
 TEST_F(NpCppTest, ByteBufferEmptyString) {
   auto bytes = absl::HexStringToBytes("");
-  auto buffer = nearby_protocol::ByteBuffer<10>::CopyFrom(bytes);
+  auto buffer = nearby_protocol::ByteBuffer<10>::TryFromString(bytes);
   ASSERT_TRUE(buffer.ok());
 }
 
 TEST_F(NpCppTest, ByteBufferToVector) {
   auto bytes = absl::HexStringToBytes("1234567890");
-  auto buffer = nearby_protocol::ByteBuffer<100>::CopyFrom(bytes);
+  auto buffer = nearby_protocol::ByteBuffer<100>::TryFromString(bytes);
   auto vec = buffer.value().ToVector();
-  std::vector<uint8_t> expected{0x12, 0x34, 0x56, 0x78, 0x90};
+  const std::vector<uint8_t> expected{0x12, 0x34, 0x56, 0x78, 0x90};
   ASSERT_EQ(vec, expected);
 }
 
 TEST_F(NpCppTest, ByteBufferEndToEndPayloadAsString) {
-  std::string bytes = absl::HexStringToBytes("2003031503");
-  auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+  const std::string bytes = absl::HexStringToBytes("2003031503");
+  auto buffer = nearby_protocol::ByteBuffer<
+      nearby_protocol::MAX_ADV_PAYLOAD_SIZE>::TryFromString(bytes);
   ASSERT_TRUE(buffer.ok());
 
-  nearby_protocol::RawAdvertisementPayload adv(buffer.value());
+  const nearby_protocol::RawAdvertisementPayload adv(buffer.value());
 
   auto credential_slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto credential_book =
@@ -86,3 +138,4 @@
                  .ToString();
   ASSERT_EQ(str, absl::HexStringToBytes("03"));
 }
+// NOLINTEND(readability-magic-numbers)
\ No newline at end of file

diff --git a/nearby/presence/np_cpp_ffi/tests/credential_book_tests.cc b/nearby/presence/np_cpp_ffi/tests/credential_book_tests.cc
index af8fc0d..32aa173 100644
--- a/nearby/presence/np_cpp_ffi/tests/credential_book_tests.cc
+++ b/nearby/presence/np_cpp_ffi/tests/credential_book_tests.cc

@@ -12,26 +12,32 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "nearby_protocol.h"
-#include "shared_test_util.h"
-#include "np_cpp_test.h"
+#include <utility>
 
+#include "absl/status/status.h"
 #include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "np_cpp_test.h"
+#include "shared_test_util.h"
 
 TEST_F(NpCppTest, TestSetMaxCredBooks) {
   auto slab1_result = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(slab1_result.ok());
-  auto book1_result = nearby_protocol::CredentialBook::TryCreateFromSlab(slab1_result.value());
+  auto book1_result =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(slab1_result.value());
   ASSERT_TRUE(book1_result.ok());
 
   auto slab2_result = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(slab2_result.ok());
-  auto book2_result = nearby_protocol::CredentialBook::TryCreateFromSlab(slab2_result.value());
+  auto book2_result =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(slab2_result.value());
   ASSERT_TRUE(book2_result.ok());
 
   auto slab3_result = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(slab3_result.ok());
-  auto book3_result = nearby_protocol::CredentialBook::TryCreateFromSlab(slab3_result.value());
+  auto book3_result =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(slab3_result.value());
 
   ASSERT_FALSE(book3_result.ok());
   ASSERT_TRUE(absl::IsResourceExhausted(book3_result.status()));
@@ -41,31 +47,32 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto deserialize_result =
-      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvSimple,
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvPlaintext,
                                                               book);
   ASSERT_EQ(deserialize_result.GetKind(),
-            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+            nearby_protocol::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));
+  const nearby_protocol::CredentialBook next_book(std::move(book));
   auto deserialize_result_moved =
-      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvSimple,
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvPlaintext,
                                                               next_book);
   ASSERT_EQ(deserialize_result_moved.GetKind(),
-            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
 
   // The old object should now lead to use after moved assert failure
-  ASSERT_DEATH([[maybe_unused]] auto failure =
-                   nearby_protocol::Deserializer::DeserializeAdvertisement(
-                       V0AdvSimple, book), // NOLINT(bugprone-use-after-move)
-               "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          nearby_protocol::Deserializer::DeserializeAdvertisement(
+              V0AdvPlaintext, 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));
+  const nearby_protocol::CredentialBook another_moved_book(std::move(book));
   ASSERT_DEATH([[maybe_unused]] auto failure =
                    nearby_protocol::Deserializer::DeserializeAdvertisement(
-                       V0AdvSimple, another_moved_book),
+                       V0AdvPlaintext, another_moved_book),
                "");
 }
 
@@ -73,33 +80,35 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto deserialize_result =
-      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvSimple,
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvPlaintext,
                                                               book);
   ASSERT_EQ(deserialize_result.GetKind(),
-            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
 
   // create a second empty credential book
   auto other_slab = nearby_protocol::CredentialSlab::TryCreate().value();
-  auto other_book = nearby_protocol::CredentialBook::TryCreateFromSlab(other_slab).value();
+  auto other_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(other_slab).value();
   other_book = std::move(book);
 
   // new credential book should still be successful
   auto deserialize_result_other =
-      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvSimple,
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvPlaintext,
                                                               other_book);
   ASSERT_EQ(deserialize_result_other.GetKind(),
-            np_ffi::internal::DeserializeAdvertisementResultKind::V0);
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
 
   // The old object should now lead to use after moved assert failure
-  ASSERT_DEATH([[maybe_unused]] auto failure =
-                   nearby_protocol::Deserializer::DeserializeAdvertisement(
-                       V0AdvSimple, book), // NOLINT(bugprone-use-after-move)
-               "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          nearby_protocol::Deserializer::DeserializeAdvertisement(
+              V0AdvPlaintext, 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(
-                       V0AdvSimple, another_moved_book),
+                       V0AdvPlaintext, another_moved_book),
                "");
 }

diff --git a/nearby/presence/np_cpp_ffi/tests/credential_slab_tests.cc b/nearby/presence/np_cpp_ffi/tests/credential_slab_tests.cc
index b99ab5e..719323f 100644
--- a/nearby/presence/np_cpp_ffi/tests/credential_slab_tests.cc
+++ b/nearby/presence/np_cpp_ffi/tests/credential_slab_tests.cc

@@ -12,12 +12,17 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <array>
+#include <cstdint>
+#include <span>
+#include <utility>
+
+#include "absl/status/status.h"
+#include "gtest/gtest.h"
 #include "nearby_protocol.h"
 #include "np_cpp_test.h"
-#include "shared_test_util.h"
 
-#include "gtest/gtest.h"
-
+// NOLINTBEGIN(readability-magic-numbers)
 TEST_F(NpCppTest, TestSetMaxCredSlabs) {
   auto slab1_result = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(slab1_result.ok());
@@ -50,7 +55,7 @@
   // result in an assert failure.
   ASSERT_DEATH([[maybe_unused]] auto failure =
                    nearby_protocol::CredentialBook::TryCreateFromSlab(
-                       slab), // NOLINT(bugprone-use-after-move)
+                       slab),  // NOLINT(bugprone-use-after-move)
                "");
   ASSERT_DEATH(
       [[maybe_unused]] auto failure =
@@ -99,14 +104,14 @@
   // The old object should now lead to use after moved assert failure
   ASSERT_DEATH([[maybe_unused]] auto failure =
                    nearby_protocol::CredentialBook::TryCreateFromSlab(
-                       slab_result.value()), // NOLINT(bugprone-use-after-move)
+                       slab_result.value()),  // NOLINT(bugprone-use-after-move)
                "");
 
   // moving again should still lead to a use after moved assert failure
   auto another_moved_book = std::move(slab_result.value());
   ASSERT_DEATH([[maybe_unused]] auto failure =
                    nearby_protocol::CredentialBook::TryCreateFromSlab(
-                       another_moved_book), // NOLINT(bugprone-use-after-move)
+                       another_moved_book),  // NOLINT(bugprone-use-after-move)
                "");
 }
 
@@ -115,13 +120,13 @@
   ASSERT_TRUE(slab_result.ok());
 
   uint8_t metadata[] = {1, 2, 3};
-  std::span<uint8_t> metadata_span(metadata);
+  const std::span<uint8_t> metadata_span(metadata);
 
-  nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
-  std::array<uint8_t, 32> key_seed {1, 2, 3};
-  std::array<uint8_t, 32> legacy_metadata_key_hmac {1, 2, 3};
+  const nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
+  const std::array<uint8_t, 32> key_seed{1, 2, 3};
+  const std::array<uint8_t, 32> legacy_metadata_key_hmac{1, 2, 3};
 
-  nearby_protocol::V0MatchableCredential v0_cred(
+  const nearby_protocol::V0MatchableCredential v0_cred(
       key_seed, legacy_metadata_key_hmac, match_data);
   auto add_result = slab_result.value().AddV0Credential(v0_cred);
   ASSERT_EQ(add_result, absl::OkStatus());
@@ -137,11 +142,11 @@
   ASSERT_TRUE(maybe_book.ok());
 
   uint8_t metadata[] = {1, 2, 3};
-  std::span<uint8_t> metadata_span(metadata);
-  nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
-  std::array<uint8_t, 32> key_seed {1, 2, 3};
-  std::array<uint8_t, 32> legacy_metadata_key_hmac {1, 2, 3};
-  nearby_protocol::V0MatchableCredential v0_cred(
+  const std::span<uint8_t> metadata_span(metadata);
+  const nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
+  const std::array<uint8_t, 32> key_seed{1, 2, 3};
+  const std::array<uint8_t, 32> legacy_metadata_key_hmac{1, 2, 3};
+  const nearby_protocol::V0MatchableCredential v0_cred(
       key_seed, legacy_metadata_key_hmac, match_data);
 
   ASSERT_DEATH([[maybe_unused]] auto add_result =
@@ -154,13 +159,13 @@
   ASSERT_TRUE(slab_result.ok());
 
   uint8_t metadata[] = {1, 2, 3};
-  std::span<uint8_t> metadata_span(metadata);
-  nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
-  std::array<uint8_t, 32> key_seed {1, 2, 3};
-  std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac {1, 2, 3};
-  std::array<uint8_t, 32> expected_signed_metadata_key_hmac {1, 2, 3};
-  std::array<uint8_t, 32> pub_key {1, 2, 3};
-  nearby_protocol::V1MatchableCredential v1_cred(
+  const std::span<uint8_t> metadata_span(metadata);
+  const nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
+  const std::array<uint8_t, 32> key_seed{1, 2, 3};
+  const std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac{1, 2, 3};
+  const std::array<uint8_t, 32> expected_signed_metadata_key_hmac{1, 2, 3};
+  const std::array<uint8_t, 32> pub_key{1, 2, 3};
+  const nearby_protocol::V1MatchableCredential v1_cred(
       key_seed, expected_unsigned_metadata_key_hmac,
       expected_signed_metadata_key_hmac, pub_key, match_data);
 
@@ -178,13 +183,13 @@
   ASSERT_TRUE(maybe_book.ok());
 
   uint8_t metadata[] = {1, 2, 3};
-  std::span<uint8_t> metadata_span(metadata);
-  nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
-  std::array<uint8_t, 32> key_seed {1, 2, 3};
-  std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac {1, 2, 3};
-  std::array<uint8_t, 32> expected_signed_metadata_key_hmac {1, 2, 3};
-  std::array<uint8_t, 32> pub_key {1, 2, 3};
-  nearby_protocol::V1MatchableCredential v1_cred(
+  const std::span<uint8_t> metadata_span(metadata);
+  const nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
+  const std::array<uint8_t, 32> key_seed{1, 2, 3};
+  const std::array<uint8_t, 32> expected_unsigned_metadata_key_hmac{1, 2, 3};
+  const std::array<uint8_t, 32> expected_signed_metadata_key_hmac{1, 2, 3};
+  const std::array<uint8_t, 32> pub_key{1, 2, 3};
+  const nearby_protocol::V1MatchableCredential v1_cred(
       key_seed, expected_unsigned_metadata_key_hmac,
       expected_signed_metadata_key_hmac, pub_key, match_data);
 
@@ -192,3 +197,37 @@
                    slab_result.value().AddV1Credential(v1_cred);
                , "");
 }
+
+// make sure the book can be populated with many credentials
+TEST_F(NpCppTest, TestAddManyCredentials) {
+  auto slab_result = nearby_protocol::CredentialSlab::TryCreate();
+  ASSERT_TRUE(slab_result.ok());
+
+  // Should be able to load the slab up with many credentials
+  for (int i = 0; i < 500; i++) {
+    uint8_t metadata[] = {1, 2, 3};
+    const std::span<uint8_t> metadata_span(metadata);
+    const nearby_protocol::MatchedCredentialData match_data(111, metadata_span);
+    const std::array<uint8_t, 32> key_seed{1, 2, 3};
+    const std::array<uint8_t, 32> legacy_metadata_key_hmac{1, 2, 3};
+    const nearby_protocol::V0MatchableCredential v0_cred(
+        key_seed, legacy_metadata_key_hmac, match_data);
+    auto add_result = slab_result->AddV0Credential(v0_cred);
+    ASSERT_EQ(add_result, absl::OkStatus());
+
+    const std::array<uint8_t, 32> v1_key_seed{1, 2, 3};
+    const std::array<uint8_t, 32> v1_expected_unsigned_metadata_key_hmac{1, 2,
+                                                                         3};
+    const std::array<uint8_t, 32> v1_expected_signed_metadata_key_hmac{1, 2, 3};
+    const std::array<uint8_t, 32> v1_pub_key{1, 2, 3};
+    const nearby_protocol::V1MatchableCredential v1_cred(
+        v1_key_seed, v1_expected_unsigned_metadata_key_hmac,
+        v1_expected_signed_metadata_key_hmac, v1_pub_key, match_data);
+
+    auto add_v1_result = slab_result->AddV1Credential(v1_cred);
+    ASSERT_EQ(add_v1_result, absl::OkStatus());
+  }
+  ASSERT_TRUE(
+      nearby_protocol::CredentialBook::TryCreateFromSlab(*slab_result).ok());
+}
+// NOLINTEND(readability-magic-numbers)
\ 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
index 0469933..37ef27a 100644
--- a/nearby/presence/np_cpp_ffi/tests/deserialize_result_tests.cc
+++ b/nearby/presence/np_cpp_ffi/tests/deserialize_result_tests.cc

@@ -12,18 +12,22 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "nearby_protocol.h"
-#include "shared_test_util.h"
-#include "np_cpp_test.h"
+#include <array>
+#include <cstdint>
+#include <utility>
 
 #include "absl/strings/escaping.h"
 #include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "np_cpp_test.h"
+#include "shared_test_util.h"
 
 TEST_F(NpCppTest, TestResultMoveConstructor) {
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, book);
   ASSERT_EQ(result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
 
@@ -39,7 +43,7 @@
   // 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
+                   result.IntoV0(),  // NOLINT(bugprone-use-after-move)
                "");
   ASSERT_DEATH([[maybe_unused]] auto failure = result.GetKind(), "");
 
@@ -53,15 +57,18 @@
 
 TEST_F(NpCppTest, DeserializeFromStringView) {
   auto bytes = absl::HexStringToBytes("00031503");
-  auto buffer = nearby_protocol::ByteBuffer<255>::CopyFrom(bytes);
+  auto buffer = nearby_protocol::ByteBuffer<
+      nearby_protocol::MAX_ADV_PAYLOAD_SIZE>::TryFromString(bytes);
   ASSERT_TRUE(buffer.ok());
 
-  nearby_protocol::RawAdvertisementPayload adv(buffer.value());
+  const nearby_protocol::RawAdvertisementPayload adv(buffer.value());
 
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
@@ -76,8 +83,7 @@
             nearby_protocol::DeserializedV0AdvertisementKind::Legible);
   auto legible_adv = v0_adv.IntoLegible();
   auto identity = legible_adv.GetIdentityKind();
-  ASSERT_EQ(identity,
-            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+  ASSERT_EQ(identity, nearby_protocol::DeserializedV0IdentityKind::Plaintext);
 
   auto num_des = legible_adv.GetNumberOfDataElements();
   ASSERT_EQ(num_des, 1);
@@ -89,20 +95,20 @@
 
   ASSERT_EQ(de.GetKind(), nearby_protocol::V0DataElementKind::TxPower);
   auto tx_power = de.AsTxPower();
-  ASSERT_EQ(tx_power.tx_power, 3);
+  ASSERT_EQ(tx_power.GetAsI8(), 3);
 }
 
 TEST_F(NpCppTest, TestResultMoveAssignment) {
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, book);
   ASSERT_EQ(result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
 
   // create a second result
   auto another_result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, book);
   ASSERT_EQ(another_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
 
@@ -116,7 +122,7 @@
   // 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)
+                   result.IntoV0(),  // NOLINT(bugprone-use-after-move)
                "");
   ASSERT_DEATH([[maybe_unused]] auto failure = result.GetKind(), "");
 
@@ -128,13 +134,16 @@
 
 TEST_F(NpCppTest, TestInvalidPayloadHeader) {
   // An invalid header result should result in error
-  nearby_protocol::RawAdvertisementPayload InvalidHeaderPayload(
-      nearby_protocol::ByteBuffer<255>({1, {0xFF}}));
+  const std::array<uint8_t, 1> InvalidHeaderPayloadBytes{0xFF};
+  const nearby_protocol::RawAdvertisementPayload InvalidHeaderPayload(
+      (nearby_protocol::ByteBuffer<255>(InvalidHeaderPayloadBytes)));
 
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
@@ -144,27 +153,29 @@
   // 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(); },
-               "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV0(); }, "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV1(); }, "");
 }
 
 TEST_F(NpCppTest, TestInvalidV0Cast) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V1AdvSimple, maybe_credential_book.value());
+          V1AdvPlaintext, maybe_credential_book.value());
 
   ASSERT_EQ(deserialize_result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V1);
-  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV0(); },
-               "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV0(); }, "");
 }
 
 TEST_F(NpCppTest, TestInvalidV1Cast) {
@@ -172,30 +183,33 @@
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
-
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V0AdvSimple, maybe_credential_book.value());
+          V0AdvPlaintext, maybe_credential_book.value());
 
   ASSERT_EQ(deserialize_result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V0);
-  ASSERT_DEATH({ [[maybe_unused]] auto failure = deserialize_result.IntoV1(); },
-               "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV1(); }, "");
 }
 
 TEST_F(NpCppTest, V0UseResultTwice) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V0AdvSimple, maybe_credential_book.value());
+          V0AdvPlaintext, maybe_credential_book.value());
   ASSERT_EQ(deserialize_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
 
@@ -203,20 +217,22 @@
   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(); },
-               "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV0(); }, "");
 }
 
 TEST_F(NpCppTest, V1UseResultTwice) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V1AdvSimple, maybe_credential_book.value());
+          V1AdvPlaintext, maybe_credential_book.value());
   ASSERT_EQ(deserialize_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V1);
 
@@ -224,20 +240,22 @@
   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(); },
-               "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV1(); }, "");
 }
 
 TEST_F(NpCppTest, IntoV0AfterOutOfScope) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V0AdvSimple, maybe_credential_book.value());
+          V0AdvPlaintext, maybe_credential_book.value());
   ASSERT_EQ(deserialize_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
 
@@ -246,20 +264,22 @@
 
   // 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(); },
-               "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV0(); }, "");
 }
 
 TEST_F(NpCppTest, IntoV1AfterOutOfScope) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V1AdvSimple, maybe_credential_book.value());
+          V1AdvPlaintext, maybe_credential_book.value());
   ASSERT_EQ(deserialize_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V1);
 
@@ -268,20 +288,22 @@
 
   // 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(); },
-               "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV1(); }, "");
 }
 
 TEST_F(NpCppTest, V0ResultKindAfterOutOfScope) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V0AdvSimple, maybe_credential_book.value());
+          V0AdvPlaintext, maybe_credential_book.value());
   ASSERT_EQ(deserialize_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
 
@@ -298,12 +320,14 @@
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
 
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V1AdvSimple, maybe_credential_book.value());
+          V1AdvPlaintext, maybe_credential_book.value());
   ASSERT_EQ(deserialize_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V1);
 

diff --git a/nearby/presence/np_cpp_ffi/tests/np_cpp_test.h b/nearby/presence/np_cpp_ffi/tests/np_cpp_test.h
index 03eb03a..6cbf8c9 100644
--- a/nearby/presence/np_cpp_ffi/tests/np_cpp_test.h
+++ b/nearby/presence/np_cpp_ffi/tests/np_cpp_test.h

@@ -15,13 +15,12 @@
 #ifndef NEARBY_PRESENCE_NP_CPP_FFI_TESTS_NP_CPP_TEST_H_
 #define NEARBY_PRESENCE_NP_CPP_FFI_TESTS_NP_CPP_TEST_H_
 
+#include "gtest/gtest.h"
 #include "nearby_protocol.h"
 #include "shared_test_util.h"
 
-#include <gtest/gtest.h>
-
 class NpCppTest : public testing::Test {
-protected:
+ protected:
   static void SetUpTestSuite() {
     if (!panic_handler_set) {
       ASSERT_TRUE(
@@ -31,6 +30,7 @@
       nearby_protocol::GlobalConfig::SetMaxNumDeserializedV1Advertisements(2);
       nearby_protocol::GlobalConfig::SetMaxNumCredentialSlabs(3);
       nearby_protocol::GlobalConfig::SetMaxNumCredentialBooks(2);
+      nearby_protocol::GlobalConfig::SetMaxNumV0AdvertisementBuilders(2);
     } else {
       ASSERT_FALSE(
           nearby_protocol::GlobalConfig::SetPanicHandler(test_panic_handler));
@@ -39,4 +39,4 @@
   static bool panic_handler_set;
 };
 
-#endif // NEARBY_PRESENCE_NP_CPP_FFI_TESTS_NP_CPP_TEST_H_
+#endif  // NEARBY_PRESENCE_NP_CPP_FFI_TESTS_NP_CPP_TEST_H_

diff --git a/nearby/presence/np_cpp_ffi/tests/v0_encrypted_deserialization_tests.cc b/nearby/presence/np_cpp_ffi/tests/v0_encrypted_deserialization_tests.cc
new file mode 100644
index 0000000..3d74295
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/v0_encrypted_deserialization_tests.cc

@@ -0,0 +1,192 @@
+// 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 <algorithm>
+#include <array>
+#include <cstdint>
+#include <span>
+#include <string>
+
+#include "absl/status/status.h"
+#include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "np_cpp_test.h"
+#include "shared_test_util.h"
+
+// NOLINTBEGIN(readability-magic-numbers)
+TEST_F(NpCppTest, V0PrivateIdentityDeserializationSimpleCase) {
+  auto slab_result = nearby_protocol::CredentialSlab::TryCreate();
+  ASSERT_TRUE(slab_result.ok());
+
+  const std::span<uint8_t> metadata_span(V0AdvEncryptedMetadata);
+  const nearby_protocol::MatchedCredentialData match_data(123, metadata_span);
+
+  std::array<uint8_t, 32> key_seed = {};
+  std::fill_n(key_seed.begin(), 32, 0x11);
+
+  const nearby_protocol::V0MatchableCredential v0_cred(
+      key_seed, V0AdvLegacyMetadataKeyHmac, match_data);
+
+  auto add_result = slab_result->AddV0Credential(v0_cred);
+  ASSERT_EQ(add_result, absl::OkStatus());
+
+  auto book_result =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(*slab_result);
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEncryptedPayload, *book_result);
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+
+  auto v0_adv = deserialize_result.IntoV0();
+  auto kind = v0_adv.GetKind();
+  ASSERT_EQ(kind, nearby_protocol::DeserializedV0AdvertisementKind::Legible);
+
+  auto legible_adv = v0_adv.IntoLegible();
+  auto identity_kind = legible_adv.GetIdentityKind();
+  ASSERT_EQ(identity_kind,
+            nearby_protocol::DeserializedV0IdentityKind::Decrypted);
+  ASSERT_EQ(legible_adv.GetNumberOfDataElements(), 1);
+
+  auto payload = legible_adv.IntoPayload();
+  auto de = payload.TryGetDataElement(0);
+  ASSERT_TRUE(de.ok());
+
+  auto metadata = payload.DecryptMetadata();
+  ASSERT_TRUE(metadata.ok());
+  ASSERT_EQ(ExpectedV0DecryptedMetadata,
+            std::string(metadata->begin(), metadata->end()));
+
+  auto identity_details = payload.GetIdentityDetails();
+  ASSERT_TRUE(identity_details.ok());
+  ASSERT_EQ(identity_details->cred_id, 123);
+  ASSERT_EQ(identity_details->identity_type,
+            nearby_protocol::EncryptedIdentityType::Private);
+
+  auto de_type = de->GetKind();
+  ASSERT_EQ(de_type, nearby_protocol::V0DataElementKind::TxPower);
+
+  auto tx_power_de = de->AsTxPower();
+  ASSERT_EQ(tx_power_de.GetAsI8(), 3);
+}
+
+nearby_protocol::CredentialBook CreateEmptyCredBook() {
+  auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
+  auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
+  return book;
+}
+
+TEST_F(NpCppTest, V0PrivateIdentityEmptyBook) {
+  auto book = CreateEmptyCredBook();
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEncryptedPayload, book);
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+
+  auto v0_adv = deserialize_result.IntoV0();
+  ASSERT_EQ(
+      v0_adv.GetKind(),
+      nearby_protocol::DeserializedV0AdvertisementKind::NoMatchingCredentials);
+
+  // Should not be able to actually access contents
+  ASSERT_DEATH([[maybe_unused]] auto failure = v0_adv.IntoLegible(), "");
+}
+
+TEST_F(NpCppTest, V0PrivateIdentityNoMatchingCreds) {
+  auto slab_result = nearby_protocol::CredentialSlab::TryCreate();
+  ASSERT_TRUE(slab_result.ok());
+
+  uint8_t metadata[] = {0};
+  const std::span<uint8_t> metadata_span(metadata);
+  const nearby_protocol::MatchedCredentialData match_data(123, metadata_span);
+
+  // A randomly picked key seed, does NOT match what was used for the canned adv
+  std::array<uint8_t, 32> key_seed = {};
+  std::fill_n(key_seed.begin(), 31, 0x11);
+
+  const nearby_protocol::V0MatchableCredential v0_cred(
+      key_seed, V0AdvLegacyMetadataKeyHmac, match_data);
+
+  auto add_result = slab_result->AddV0Credential(v0_cred);
+  ASSERT_EQ(add_result, absl::OkStatus());
+
+  auto book_result =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(*slab_result);
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(
+          V0AdvEncryptedPayload, *book_result);
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V0);
+
+  auto v0_adv = deserialize_result.IntoV0();
+  ASSERT_EQ(
+      v0_adv.GetKind(),
+      nearby_protocol::DeserializedV0AdvertisementKind::NoMatchingCredentials);
+
+  // Should not be able to actually access contents
+  ASSERT_DEATH([[maybe_unused]] auto failure = v0_adv.IntoLegible(), "");
+}
+
+// Make sure the correct credential is matched out of multiple provided
+TEST_F(NpCppTest, V0PrivateIdentityMultipleCredentials) {
+  auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
+  const std::span<uint8_t> metadata_span(V0AdvEncryptedMetadata);
+  std::array<uint8_t, 32> key_seed = {};
+  // Non matching credential
+  const nearby_protocol::MatchedCredentialData match_data(123, metadata_span);
+  std::fill_n(key_seed.begin(), 32, 0x12);
+  const nearby_protocol::V0MatchableCredential v0_cred(
+      key_seed, V0AdvLegacyMetadataKeyHmac, match_data);
+  ASSERT_TRUE(slab.AddV0Credential(v0_cred).ok());
+
+  // Matching credential
+  const nearby_protocol::MatchedCredentialData match_data2(456, metadata_span);
+  std::fill_n(key_seed.begin(), 32, 0x11);
+  const nearby_protocol::V0MatchableCredential v0_cred2(
+      key_seed, V0AdvLegacyMetadataKeyHmac, match_data2);
+  ASSERT_TRUE(slab.AddV0Credential(v0_cred2).ok());
+
+  // Non matching credential
+  const nearby_protocol::MatchedCredentialData match_data3(789, metadata_span);
+  std::fill_n(key_seed.begin(), 32, 0x13);
+  const nearby_protocol::V0MatchableCredential v0_cred3(
+      key_seed, V0AdvLegacyMetadataKeyHmac, match_data3);
+  ASSERT_TRUE(slab.AddV0Credential(v0_cred3).ok());
+
+  auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
+  auto legible_adv = nearby_protocol::Deserializer::DeserializeAdvertisement(
+                         V0AdvEncryptedPayload, book)
+                         .IntoV0()
+                         .IntoLegible();
+  ASSERT_EQ(legible_adv.GetIdentityKind(),
+            nearby_protocol::DeserializedV0IdentityKind::Decrypted);
+  ASSERT_EQ(legible_adv.GetNumberOfDataElements(), 1);
+
+  auto payload = legible_adv.IntoPayload();
+  ASSERT_TRUE(payload.TryGetDataElement(0).ok());
+
+  // Make sure the correct credential matches
+  auto identity_details = payload.GetIdentityDetails();
+  ASSERT_TRUE(identity_details.ok());
+  ASSERT_EQ(identity_details->cred_id, 456);
+  ASSERT_EQ(identity_details->identity_type,
+            nearby_protocol::EncryptedIdentityType::Private);
+}
+// NOLINTEND(readability-magic-numbers)

diff --git a/nearby/presence/np_cpp_ffi/tests/v0_encrypted_serialization_tests.cc b/nearby/presence/np_cpp_ffi/tests/v0_encrypted_serialization_tests.cc
new file mode 100644
index 0000000..ebc82a4
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/v0_encrypted_serialization_tests.cc

@@ -0,0 +1,62 @@
+// 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 <algorithm>
+#include <array>
+#include <cstdint>
+
+#include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "np_cpp_test.h"
+#include "shared_test_util.h"
+
+// NOLINTBEGIN(readability-magic-numbers)
+
+// Corresponds to V0PrivateIdentityDeserializationSimpleCase,
+// which in turn corresponds to np_adv's examples_v0
+TEST_F(NpCppTest, V0PrivateIdentitySerializationSimpleCase) {
+  std::array<uint8_t, 32> key_seed = {};
+  std::fill_n(key_seed.begin(), 32, 0x11);
+
+  std::array<uint8_t, 14> metadata_key = {};
+  std::fill_n(metadata_key.begin(), 14, 0x33);
+
+  auto broadcast_cred =
+      nearby_protocol::V0BroadcastCredential(key_seed, metadata_key);
+
+  std::array<uint8_t, 2> salt = {};
+  std::fill_n(salt.begin(), 2, 0x22);
+
+  auto identity_type = nearby_protocol::EncryptedIdentityType::Private;
+
+  auto adv_builder =
+      nearby_protocol::V0AdvertisementBuilder::TryCreateEncrypted(
+          broadcast_cred, identity_type, salt)
+          .value();
+
+  auto tx_power = nearby_protocol::TxPower::TryBuildFromI8(3).value();
+  auto de = nearby_protocol::V0DataElement(tx_power);
+
+  ASSERT_TRUE(adv_builder.TryAddDE(de).ok());
+
+  auto serialized_bytes = adv_builder.TrySerialize().value();
+  auto actual = serialized_bytes.ToVector();
+
+  auto expected = V0AdvEncryptedBuffer.ToVector();
+
+  ASSERT_EQ(actual, expected);
+}
+
+// NOLINTEND(readability-magic-numbers)
\ 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/v0_unencrypted_deserialization_tests.cc
similarity index 79%
rename from nearby/presence/np_cpp_ffi/tests/deserialize_v0_tests.cc
rename to nearby/presence/np_cpp_ffi/tests/v0_unencrypted_deserialization_tests.cc
index 3ed2d79..4760009 100644
--- a/nearby/presence/np_cpp_ffi/tests/deserialize_v0_tests.cc
+++ b/nearby/presence/np_cpp_ffi/tests/v0_unencrypted_deserialization_tests.cc

@@ -12,40 +12,40 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "nearby_protocol.h"
-#include "shared_test_util.h"
-#include "np_cpp_test.h"
+#include <array>
+#include <cstdint>
+#include <utility>
+
+#include "absl/status/status.h"
 #include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "np_cpp_test.h"
+#include "shared_test_util.h"
 
 TEST_F(NpCppTest, InvalidCast) {
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto deserialize_result =
-      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvSimple, book);
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V0AdvPlaintext,
+                                                              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(); },
-               "");
+  ASSERT_DEATH(
+      { [[maybe_unused]] auto failure = deserialize_result.IntoV1(); }, "");
 }
 
-TEST_F(NpCppTest, 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
-      }));
-
+TEST_F(NpCppTest, V0DeserializeSingleDataElementTxPower) {
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab);
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(slab);
   ASSERT_TRUE(maybe_credential_book.ok());
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          adv, maybe_credential_book.value());
+          V0AdvPlaintext, maybe_credential_book.value());
 
   ASSERT_EQ(deserialize_result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V0);
@@ -55,8 +55,7 @@
             nearby_protocol::DeserializedV0AdvertisementKind::Legible);
   auto legible_adv = v0_adv.IntoLegible();
   auto identity = legible_adv.GetIdentityKind();
-  ASSERT_EQ(identity,
-            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+  ASSERT_EQ(identity, nearby_protocol::DeserializedV0IdentityKind::Plaintext);
 
   auto num_des = legible_adv.GetNumberOfDataElements();
   ASSERT_EQ(num_des, 1);
@@ -68,21 +67,20 @@
 
   ASSERT_EQ(de.GetKind(), nearby_protocol::V0DataElementKind::TxPower);
   auto tx_power = de.AsTxPower();
-  ASSERT_EQ(tx_power.tx_power, 3);
+  ASSERT_EQ(tx_power.GetAsI8(), 3);
 }
 
 TEST_F(NpCppTest, V0LengthOneActionsDataElement) {
-  nearby_protocol::RawAdvertisementPayload adv(
-      nearby_protocol::ByteBuffer<255>({
-          4,
-          {0x00,       // Adv Header
-           0x03,       // Public DE header
-           0x16, 0x00} // Length 1 Actions DE
-      }));
+  const std::array<uint8_t, 4> V0AdvPlaintextLengthOneActions{0x00, 0x03, 0x16,
+                                                              0x00};
+  const nearby_protocol::RawAdvertisementPayload adv(
+      (nearby_protocol::ByteBuffer<255>(V0AdvPlaintextLengthOneActions)));
 
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
@@ -96,8 +94,7 @@
             nearby_protocol::DeserializedV0AdvertisementKind::Legible);
   auto legible_adv = v0_adv.IntoLegible();
   auto identity = legible_adv.GetIdentityKind();
-  ASSERT_EQ(identity,
-            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+  ASSERT_EQ(identity, nearby_protocol::DeserializedV0IdentityKind::Plaintext);
 
   auto num_des = legible_adv.GetNumberOfDataElements();
   ASSERT_EQ(num_des, 1);
@@ -113,17 +110,16 @@
 }
 
 TEST_F(NpCppTest, V0LengthTwoActionsDataElement) {
-  nearby_protocol::RawAdvertisementPayload adv(
-      nearby_protocol::ByteBuffer<255>({
-          5,
-          {0x00,             // Adv Header
-           0x03,             // Public DE header
-           0x26, 0xD0, 0x46} // Length 2 Actions DE
-      }));
+  const std::array<uint8_t, 5> V0AdvPlaintextLengthTwoActions{0x00, 0x03, 0x26,
+                                                              0xD0, 0x46};
+  const nearby_protocol::RawAdvertisementPayload adv(
+      (nearby_protocol::ByteBuffer<255>(V0AdvPlaintextLengthTwoActions)));
 
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
@@ -137,8 +133,7 @@
             nearby_protocol::DeserializedV0AdvertisementKind::Legible);
   auto legible_adv = v0_adv.IntoLegible();
   auto identity = legible_adv.GetIdentityKind();
-  ASSERT_EQ(identity,
-            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+  ASSERT_EQ(identity, nearby_protocol::DeserializedV0IdentityKind::Plaintext);
 
   auto num_des = legible_adv.GetNumberOfDataElements();
   ASSERT_EQ(num_des, 1);
@@ -166,26 +161,19 @@
   ASSERT_FALSE(
       actions.HasAction(nearby_protocol::BooleanActionType::PresenceManager));
 
-  ASSERT_EQ(actions.GetContextSyncSequenceNumber(), 0xD);
+  ASSERT_EQ(actions.GetContextSyncSequenceNumber().GetAsU8(), 0xD);
 }
 
 TEST_F(NpCppTest, 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_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          adv, maybe_credential_book.value());
+          V0AdvPlaintextMultiDe, maybe_credential_book.value());
 
   ASSERT_EQ(deserialize_result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V0);
@@ -195,8 +183,7 @@
             nearby_protocol::DeserializedV0AdvertisementKind::Legible);
   auto legible_adv = v0_adv.IntoLegible();
   auto identity = legible_adv.GetIdentityKind();
-  ASSERT_EQ(identity,
-            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+  ASSERT_EQ(identity, nearby_protocol::DeserializedV0IdentityKind::Plaintext);
 
   auto num_des = legible_adv.GetNumberOfDataElements();
   ASSERT_EQ(num_des, 2);
@@ -208,7 +195,7 @@
 
   ASSERT_EQ(first_de.GetKind(), nearby_protocol::V0DataElementKind::TxPower);
   auto power = first_de.AsTxPower();
-  ASSERT_EQ(power.tx_power, 5);
+  ASSERT_EQ(power.GetAsI8(), 5);
 
   auto second_de_result = payload.TryGetDataElement(1);
   ASSERT_TRUE(second_de_result.ok());
@@ -217,13 +204,15 @@
   ASSERT_EQ(second_de.GetKind(), nearby_protocol::V0DataElementKind::Actions);
   auto actions = second_de.AsActions();
   ASSERT_EQ(actions.GetAsU32(), (uint32_t)0x00460000);
-  ASSERT_EQ(actions.GetContextSyncSequenceNumber(), (uint8_t)0);
+  ASSERT_EQ(actions.GetContextSyncSequenceNumber().GetAsU8(), (uint8_t)0);
 }
 
 TEST_F(NpCppTest, V0EmptyPayload) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
@@ -237,20 +226,20 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, 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));
+  const 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
+                   adv.IntoLegible(),  // NOLINT(bugprone-use-after-move)
                "");
   ASSERT_DEATH([[maybe_unused]] auto failure = adv.GetKind(), "");
 
@@ -265,14 +254,14 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, 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(
-      V0AdvSimple, book);
+      V0AdvPlaintext, book);
   ASSERT_EQ(another_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
   auto adv2 = another_result.IntoV0();
@@ -285,7 +274,7 @@
   // 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)
+                   adv.IntoLegible(),  // NOLINT(bugprone-use-after-move)
                "");
   ASSERT_DEATH([[maybe_unused]] auto failure = adv.GetKind(), "");
 
@@ -295,17 +284,18 @@
   ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetKind(), "");
 }
 
-static nearby_protocol::DeserializeAdvertisementResult
-CreateAdv(nearby_protocol::CredentialBook &book) {
+nearby_protocol::DeserializeAdvertisementResult CreateAdv(
+    nearby_protocol::CredentialBook &book) {
   auto adv = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, book);
   return adv;
 }
 
 TEST_F(NpCppTest, V0AdvDestructor) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto book_result = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto book_result = nearby_protocol::CredentialBook::TryCreateFromSlab(
+      maybe_credential_slab.value());
   ASSERT_TRUE(book_result.ok());
   {
     auto deserialize_result = CreateAdv(book_result.value());
@@ -320,7 +310,7 @@
     // Going over max amount should result in error
     auto deserialize_result3 =
         nearby_protocol::Deserializer::DeserializeAdvertisement(
-            V0AdvSimple, book_result.value());
+            V0AdvPlaintext, book_result.value());
     ASSERT_EQ(deserialize_result3.GetKind(),
               np_ffi::internal::DeserializeAdvertisementResultKind::Error);
 
@@ -333,7 +323,7 @@
   // will create room for one more to be created.
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V0AdvSimple, book_result.value());
+          V0AdvPlaintext, book_result.value());
   ASSERT_EQ(deserialize_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
 }
@@ -341,11 +331,13 @@
 TEST_F(NpCppTest, V0AdvUseAfterMove) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V0AdvSimple, maybe_credential_book.value());
+          V0AdvPlaintext, maybe_credential_book.value());
 
   ASSERT_EQ(deserialize_result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V0);
@@ -364,22 +356,24 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, 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));
+  const nearby_protocol::LegibleDeserializedV0Advertisement moved(
+      std::move(legible));
   ASSERT_EQ(moved.GetNumberOfDataElements(), 1);
   ASSERT_EQ(moved.GetIdentityKind(),
             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.GetIdentityKind(), // NOLINT(bugprone-use-after-move
-               "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          legible.GetIdentityKind(),  // NOLINT(bugprone-use-after-move)
+      "");
   ASSERT_DEATH(
       [[maybe_unused]] auto failure = legible.GetNumberOfDataElements(), "");
   ASSERT_DEATH([[maybe_unused]] auto failure = legible.IntoPayload(), "");
@@ -388,10 +382,11 @@
   // abort
   nearby_protocol::LegibleDeserializedV0Advertisement moved_again(
       std::move(legible));
-  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetIdentityKind(), "");
-  ASSERT_DEATH([[maybe_unused]] auto failure =
-                   moved_again.GetNumberOfDataElements(),
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetIdentityKind(),
                "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = moved_again.GetNumberOfDataElements(),
+      "");
   ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.IntoPayload(), "");
 }
 
@@ -399,14 +394,14 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, 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(
-      V0AdvSimple, book);
+      V0AdvPlaintext, book);
   ASSERT_EQ(another_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
   auto legible2 = another_result.IntoV0().IntoLegible();
@@ -418,9 +413,10 @@
 
   // original result should now be invalid, using it will trigger a use after
   // free abort.
-  ASSERT_DEATH([[maybe_unused]] auto failure =
-                   legible.GetIdentityKind(), // NOLINT(bugprone-use-after-move)
-               "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          legible.GetIdentityKind(),  // NOLINT(bugprone-use-after-move)
+      "");
   ASSERT_DEATH(
       [[maybe_unused]] auto failure = legible.GetNumberOfDataElements(), "");
   ASSERT_DEATH([[maybe_unused]] auto failure = legible.IntoPayload(), "");
@@ -428,16 +424,17 @@
   // 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.GetIdentityKind(), "");
-  ASSERT_DEATH([[maybe_unused]] auto failure =
-                   moved_again.GetNumberOfDataElements(),
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.GetIdentityKind(),
                "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = moved_again.GetNumberOfDataElements(),
+      "");
 }
 
-nearby_protocol::LegibleDeserializedV0Advertisement
-CreateLegibleAdv(nearby_protocol::CredentialBook &book) {
+nearby_protocol::LegibleDeserializedV0Advertisement CreateLegibleAdv(
+    nearby_protocol::CredentialBook &book) {
   auto adv = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, book);
   auto v0_adv = adv.IntoV0();
   return v0_adv.IntoLegible();
 }
@@ -456,10 +453,11 @@
 
   // now that the legible adv has moved into the payload it should no longer be
   // valid
-  ASSERT_DEATH([[maybe_unused]] auto failure = legible_adv.GetIdentityKind(), "");
-  ASSERT_DEATH([[maybe_unused]] auto failure =
-                   legible_adv.GetNumberOfDataElements(),
+  ASSERT_DEATH([[maybe_unused]] auto failure = legible_adv.GetIdentityKind(),
                "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = legible_adv.GetNumberOfDataElements(),
+      "");
   ASSERT_DEATH([[maybe_unused]] auto failure = legible_adv.IntoPayload(), "");
 }
 
@@ -480,20 +478,20 @@
 
     // allocation slots should be full
     ASSERT_EQ(nearby_protocol::Deserializer::DeserializeAdvertisement(
-                  V0AdvSimple, book)
+                  V0AdvPlaintext, 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);
+      V0AdvPlaintext, book);
   ASSERT_EQ(result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V0);
 }
 
-nearby_protocol::V0Payload
-CreatePayload(nearby_protocol::CredentialBook &book) {
+nearby_protocol::V0Payload CreatePayload(
+    nearby_protocol::CredentialBook &book) {
   auto legible_adv = CreateLegibleAdv(book);
   return legible_adv.IntoPayload();
 }
@@ -511,7 +509,7 @@
 
     // allocation slots should be full
     ASSERT_EQ(nearby_protocol::Deserializer::DeserializeAdvertisement(
-                  V0AdvSimple, book)
+                  V0AdvPlaintext, book)
                   .GetKind(),
               nearby_protocol::DeserializeAdvertisementResultKind::Error);
   }
@@ -519,7 +517,7 @@
   // 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);
+      V0AdvPlaintext, book);
   ASSERT_EQ(result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V0);
 }
@@ -528,25 +526,27 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, 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));
+  const 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
-               "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          payload.TryGetDataElement(  // NOLINT(bugprone-use-after-move)
+              0),
+      "");
 
   // moving again should still preserve the moved state and also lead to an
   // abort
-  nearby_protocol::V0Payload moved_again(std::move(payload));
+  const nearby_protocol::V0Payload moved_again(std::move(payload));
   ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.TryGetDataElement(0),
                "");
 }
@@ -555,14 +555,14 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V0AdvSimple, book);
+      V0AdvPlaintext, 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);
+      V0AdvPlaintext, book);
   ASSERT_EQ(another_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V0);
   auto payload2 = another_result.IntoV0().IntoLegible().IntoPayload();
@@ -573,9 +573,11 @@
 
   // 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)
-               "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure =
+          payload.TryGetDataElement(  // NOLINT(bugprone-use-after-move)
+              0),
+      "");
 
   // moving again should still lead to an error
   auto moved_again = std::move(payload);
@@ -586,11 +588,13 @@
 TEST_F(NpCppTest, InvalidDataElementCast) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V0AdvSimple, maybe_credential_book.value());
+          V0AdvPlaintext, maybe_credential_book.value());
 
   ASSERT_EQ(deserialize_result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V0);
@@ -599,8 +603,7 @@
             nearby_protocol::DeserializedV0AdvertisementKind::Legible);
   auto legible_adv = v0_adv.IntoLegible();
   auto identity = legible_adv.GetIdentityKind();
-  ASSERT_EQ(identity,
-            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+  ASSERT_EQ(identity, nearby_protocol::DeserializedV0IdentityKind::Plaintext);
 
   auto num_des = legible_adv.GetNumberOfDataElements();
   ASSERT_EQ(num_des, 1);
@@ -617,11 +620,13 @@
 TEST_F(NpCppTest, InvalidDataElementIndex) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V0AdvSimple, maybe_credential_book.value());
+          V0AdvPlaintext, maybe_credential_book.value());
 
   ASSERT_EQ(deserialize_result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V0);
@@ -631,8 +636,7 @@
             nearby_protocol::DeserializedV0AdvertisementKind::Legible);
   auto legible_adv = v0_adv.IntoLegible();
   auto identity = legible_adv.GetIdentityKind();
-  ASSERT_EQ(identity,
-            nearby_protocol::DeserializedV0IdentityKind::Plaintext);
+  ASSERT_EQ(identity, nearby_protocol::DeserializedV0IdentityKind::Plaintext);
 
   auto num_des = legible_adv.GetNumberOfDataElements();
   ASSERT_EQ(num_des, 1);

diff --git a/nearby/presence/np_cpp_ffi/tests/v0_unencrypted_serialization_tests.cc b/nearby/presence/np_cpp_ffi/tests/v0_unencrypted_serialization_tests.cc
new file mode 100644
index 0000000..0ce4d24
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/v0_unencrypted_serialization_tests.cc

@@ -0,0 +1,242 @@
+// 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 <cstdint>
+#include <utility>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "np_cpp_test.h"
+
+// NOLINTBEGIN(readability-magic-numbers)
+
+TEST_F(NpCppTest, TxPowerMustBeInRange) {
+  auto out_of_range_result = nearby_protocol::TxPower::TryBuildFromI8(100);
+  ASSERT_FALSE(out_of_range_result.ok());
+}
+
+TEST_F(NpCppTest, ContextSyncSeqNumMustBeInRange) {
+  // Check that out-of-range fails
+  auto out_of_range_result =
+      nearby_protocol::ContextSyncSeqNum::TryBuildFromU8(17);
+  ASSERT_FALSE(out_of_range_result.ok());
+
+  // Check that if it's in range, we can get a context sync seq num and set it
+  // appropriately within an actions field.
+  auto actions = nearby_protocol::V0Actions::BuildNewZeroed(
+      nearby_protocol::AdvertisementBuilderKind::Public);
+  auto seq_num = nearby_protocol::ContextSyncSeqNum::TryBuildFromU8(15).value();
+  actions.SetContextSyncSequenceNumber(seq_num);
+  ASSERT_EQ(actions.GetContextSyncSequenceNumber().GetAsU8(),
+            seq_num.GetAsU8());
+}
+
+TEST_F(NpCppTest, V0UnencryptedActionFlavorMustMatch) {
+  auto actions = nearby_protocol::V0Actions::BuildNewZeroed(
+      nearby_protocol::AdvertisementBuilderKind::Public);
+
+  // Try to set an encrypted-only action.
+  auto mismatch_result = actions.TrySetAction(
+      nearby_protocol::BooleanActionType::InstantTethering, true);
+  ASSERT_FALSE(mismatch_result.ok());
+  // Verify that nothing changed about the actions.
+  ASSERT_EQ(actions.GetAsU32(), 0);
+
+  // Try again, but with a plaintext-compatible action.
+  auto success_result = actions.TrySetAction(
+      nearby_protocol::BooleanActionType::NearbyShare, true);
+  ASSERT_TRUE(success_result.ok());
+  ASSERT_TRUE(
+      actions.HasAction(nearby_protocol::BooleanActionType::NearbyShare));
+}
+
+// Corresponds to V0DeserializeSingleDataElementTxPower
+TEST_F(NpCppTest, V0SerializeSingleDataElementTxPower) {
+  auto adv_builder =
+      nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().value();
+
+  auto tx_power = nearby_protocol::TxPower::TryBuildFromI8(3).value();
+  auto de = nearby_protocol::V0DataElement(tx_power);
+
+  auto add_de_result = adv_builder.TryAddDE(de);
+  ASSERT_TRUE(add_de_result.ok());
+
+  auto serialized_bytes = adv_builder.TrySerialize().value();
+  auto actual = serialized_bytes.ToVector();
+
+  const std::vector<uint8_t> expected{
+      0x00,       // Adv Header
+      0x03,       // Public DE header
+      0x15, 0x03  // Length 1 Tx Power DE with value 3
+  };
+  ASSERT_EQ(actual, expected);
+}
+
+// Corresponds to V0DeserializeLengthOneActionsDataElement
+TEST_F(NpCppTest, V0SerializeLengthOneActionsDataElement) {
+  auto adv_builder =
+      nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().value();
+  auto actions = nearby_protocol::V0Actions::BuildNewZeroed(
+      nearby_protocol::AdvertisementBuilderKind::Public);
+  auto de = nearby_protocol::V0DataElement(actions);
+
+  auto add_de_result = adv_builder.TryAddDE(de);
+  ASSERT_TRUE(add_de_result.ok());
+
+  auto serialized_bytes = adv_builder.TrySerialize().value();
+  auto actual = serialized_bytes.ToVector();
+
+  const std::vector<uint8_t> expected{
+      0x00,       // Adv Header
+      0x03,       // Public DE header
+      0x16, 0x00  // Length 1 Actions DE
+  };
+
+  ASSERT_EQ(actual, expected);
+}
+
+// Corresponds to V0DeserializeLengthTwoActionsDataElement
+TEST_F(NpCppTest, V0SerializeLengthTwoActionsDataElement) {
+  auto adv_builder =
+      nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().value();
+  auto actions = nearby_protocol::V0Actions::BuildNewZeroed(
+      nearby_protocol::AdvertisementBuilderKind::Public);
+
+  ASSERT_TRUE(
+      actions
+          .TrySetAction(nearby_protocol::BooleanActionType::NearbyShare, true)
+          .ok());
+  ASSERT_TRUE(
+      actions.TrySetAction(nearby_protocol::BooleanActionType::Finder, true)
+          .ok());
+  ASSERT_TRUE(
+      actions
+          .TrySetAction(nearby_protocol::BooleanActionType::FastPairSass, true)
+          .ok());
+  auto seq_num =
+      nearby_protocol::ContextSyncSeqNum::TryBuildFromU8(0xD).value();
+  actions.SetContextSyncSequenceNumber(seq_num);
+
+  auto de = nearby_protocol::V0DataElement(actions);
+
+  auto add_de_result = adv_builder.TryAddDE(de);
+  ASSERT_TRUE(add_de_result.ok());
+
+  auto serialized_bytes = adv_builder.TrySerialize().value();
+  auto actual = serialized_bytes.ToVector();
+
+  const std::vector<uint8_t> expected{
+      0x00,             // Adv Header
+      0x03,             // Public DE header
+      0x26, 0xD0, 0x46  // Length 2 Actions DE
+  };
+
+  ASSERT_EQ(actual, expected);
+}
+// Corresponds to V0DeserializeMultipleDataElements
+TEST_F(NpCppTest, V0SerializeMultipleDataElements) {
+  auto adv_builder =
+      nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().value();
+
+  auto tx_power = nearby_protocol::TxPower::TryBuildFromI8(5).value();
+  auto tx_power_de = nearby_protocol::V0DataElement(tx_power);
+  auto add_tx_power_de_result = adv_builder.TryAddDE(tx_power_de);
+  ASSERT_TRUE(add_tx_power_de_result.ok());
+
+  auto actions = nearby_protocol::V0Actions::BuildNewZeroed(
+      nearby_protocol::AdvertisementBuilderKind::Public);
+
+  ASSERT_TRUE(
+      actions
+          .TrySetAction(nearby_protocol::BooleanActionType::NearbyShare, true)
+          .ok());
+  ASSERT_TRUE(
+      actions.TrySetAction(nearby_protocol::BooleanActionType::Finder, true)
+          .ok());
+  ASSERT_TRUE(
+      actions
+          .TrySetAction(nearby_protocol::BooleanActionType::FastPairSass, true)
+          .ok());
+
+  auto actions_de = nearby_protocol::V0DataElement(actions);
+
+  auto add_actions_de_result = adv_builder.TryAddDE(actions_de);
+  ASSERT_TRUE(add_actions_de_result.ok());
+
+  auto serialized_bytes = adv_builder.TrySerialize().value();
+  auto actual = serialized_bytes.ToVector();
+
+  const std::vector<uint8_t> expected{
+      0x00,              // Adv Header
+      0x03,              // Public DE header
+      0x15, 0x05,        // Tx Power value 5
+      0x26, 0x00, 0x46,  // Length 2 Actions
+  };
+
+  ASSERT_EQ(actual, expected);
+}
+
+// TODO: Reinstate this test.
+// TEST_F(NpCppTest, V0SerializeEmptyPayload) {
+//  auto adv_builder =
+//  nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().value(); auto
+//  serialize_result = adv_builder.TrySerialize();
+//  ASSERT_FALSE(serialize_result.ok());
+//}
+
+TEST_F(NpCppTest, TestV0AdvBuilderMoveConstructor) {
+  auto adv_builder =
+      nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().value();
+  // Move it, and ensure it's still valid.
+  nearby_protocol::V0AdvertisementBuilder moved_adv_builder(
+      std::move(adv_builder));
+
+  auto actions = nearby_protocol::V0Actions::BuildNewZeroed(
+      nearby_protocol::AdvertisementBuilderKind::Public);
+  auto actions_de = nearby_protocol::V0DataElement(actions);
+  ASSERT_TRUE(moved_adv_builder.TryAddDE(actions_de).ok());
+
+  // Trying to use the moved-out-of-object should trigger an abort
+  ASSERT_DEATH([[maybe_unused]] auto failure =
+                   adv_builder.TryAddDE(  // NOLINT(bugprone-use-after-move)
+                       actions_de),
+               "");
+
+  // Moving again should still preserve the moved state and lead to an abort
+  nearby_protocol::V0AdvertisementBuilder moved_again(std::move(adv_builder));
+  ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.TryAddDE(
+                   actions_de)  // NOLINT(bugprone-use-after-move)
+               ,
+               "");
+}
+
+TEST_F(NpCppTest, TestV0AdvBuilderDestructor) {
+  {
+    // Get us up to the limit on the number of adv builders
+    auto adv_builder_one =
+        nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().value();
+    auto adv_builder_two =
+        nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().value();
+    // Assert that we're at the limit
+    ASSERT_FALSE(
+        nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().ok());
+    // Destructors should run.
+  }
+  // The space from the adv builders should've been reclaimed now.
+  ASSERT_TRUE(nearby_protocol::V0AdvertisementBuilder::TryCreatePublic().ok());
+}
+
+// NOLINTEND(readability-magic-numbers)

diff --git a/nearby/presence/np_cpp_ffi/tests/v1_encrypted_deserialization_tests.cc b/nearby/presence/np_cpp_ffi/tests/v1_encrypted_deserialization_tests.cc
new file mode 100644
index 0000000..825b36c
--- /dev/null
+++ b/nearby/presence/np_cpp_ffi/tests/v1_encrypted_deserialization_tests.cc

@@ -0,0 +1,86 @@
+// 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 <array>
+#include <cstdint>
+#include <span>
+#include <string>
+#include <vector>
+
+#include "absl/status/status.h"
+#include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "np_cpp_test.h"
+#include "shared_test_util.h"
+
+TEST_F(NpCppTest, V1PrivateIdentitySimpleCase) {
+  auto slab_result = nearby_protocol::CredentialSlab::TryCreate();
+  ASSERT_TRUE(slab_result.ok());
+
+  const std::span<uint8_t> metadata_span(V1AdvEncryptedMetadata);
+  const nearby_protocol::MatchedCredentialData match_data(123, metadata_span);
+
+  const nearby_protocol::V1MatchableCredential v1_cred(
+      V1AdvKeySeed, V1AdvExpectedUnsignedMetadataKeyHmac,
+      V1AdvExpectedSignedMetadataKeyHmac, V1AdvPublicKey, match_data);
+
+  auto add_result = slab_result->AddV1Credential(v1_cred);
+  ASSERT_EQ(add_result, absl::OkStatus());
+
+  auto book_result =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(*slab_result);
+  ASSERT_TRUE(book_result.ok());
+
+  auto deserialize_result =
+      nearby_protocol::Deserializer::DeserializeAdvertisement(V1AdvEncrypted,
+                                                              *book_result);
+  ASSERT_EQ(deserialize_result.GetKind(),
+            nearby_protocol::DeserializeAdvertisementResultKind::V1);
+
+  auto v1_adv = deserialize_result.IntoV1();
+  ASSERT_EQ(v1_adv.GetNumUndecryptableSections(), 0);
+  ASSERT_EQ(v1_adv.GetNumLegibleSections(), 1);
+
+  auto section = v1_adv.TryGetSection(0);
+  ASSERT_TRUE(section.ok());
+  ASSERT_EQ(section->GetIdentityKind(),
+            nearby_protocol::DeserializedV1IdentityKind::Decrypted);
+  ASSERT_EQ(section->NumberOfDataElements(), 1);
+
+  auto metadata = section->DecryptMetadata();
+  ASSERT_TRUE(metadata.ok());
+  ASSERT_EQ(ExpectedV1DecryptedMetadata,
+            std::string(metadata->begin(), metadata->end()));
+
+  auto identity_details = section->GetIdentityDetails();
+  ASSERT_TRUE(identity_details.ok());
+  ASSERT_EQ(identity_details->cred_id, 123);
+  ASSERT_EQ(identity_details->verification_mode,
+            nearby_protocol::V1VerificationMode::Signature);
+  ASSERT_EQ(identity_details->identity_type,
+            nearby_protocol::EncryptedIdentityType::Private);
+
+  auto de = section->TryGetDataElement(0);
+  ASSERT_TRUE(de.ok());
+  ASSERT_EQ(de->GetDataElementTypeCode(), 5);
+  ASSERT_EQ(de->GetPayload().ToVector(), std::vector<uint8_t>{7});
+
+  auto offset = de->GetOffset();
+  auto derived_salt = section->DeriveSaltForOffset(offset);
+  ASSERT_TRUE(derived_salt.ok());
+  const std::array<uint8_t, 16> expected = {
+      94, 154, 245, 152, 164, 22, 131, 157, 8, 79, 28, 77, 236, 57, 17, 97};
+  ASSERT_EQ(*derived_salt, expected);
+}
\ No newline at end of file

diff --git a/nearby/presence/np_cpp_ffi/tests/deserialize_v1_tests.cc b/nearby/presence/np_cpp_ffi/tests/v1_unencrypted_deserialization_tests.cc
similarity index 83%
rename from nearby/presence/np_cpp_ffi/tests/deserialize_v1_tests.cc
rename to nearby/presence/np_cpp_ffi/tests/v1_unencrypted_deserialization_tests.cc
index aa32f7b..f7e233b 100644
--- a/nearby/presence/np_cpp_ffi/tests/deserialize_v1_tests.cc
+++ b/nearby/presence/np_cpp_ffi/tests/v1_unencrypted_deserialization_tests.cc

@@ -12,21 +12,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "nearby_protocol.h"
-#include "shared_test_util.h"
-#include "np_cpp_test.h"
+#include <cstdint>
+#include <utility>
+#include <vector>
 
+#include "absl/status/status.h"
 #include "gtest/gtest.h"
+#include "nearby_protocol.h"
+#include "np_cpp_ffi_types.h"
+#include "np_cpp_test.h"
+#include "shared_test_util.h"
 
 TEST_F(NpCppTest, V1SimpleTestCase) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   auto deserialize_result =
       nearby_protocol::Deserializer::DeserializeAdvertisement(
-          V1AdvSimple, maybe_credential_book.value());
+          V1AdvPlaintext, maybe_credential_book.value());
   ASSERT_EQ(deserialize_result.GetKind(),
             nearby_protocol::DeserializeAdvertisementResultKind::V1);
 
@@ -54,7 +61,7 @@
 
   auto payload = de.value().GetPayload();
   auto vec = payload.ToVector();
-  std::vector<uint8_t> expected{3};
+  const std::vector<uint8_t> expected{3};
   ASSERT_EQ(vec, expected);
 }
 
@@ -62,20 +69,20 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V1AdvSimple, book);
+      V1AdvPlaintext, 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));
+  const 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
+          adv.GetNumLegibleSections(),  // NOLINT(bugprone-use-after-move)
       "");
   ASSERT_DEATH(
       [[maybe_unused]] auto failure = adv.GetNumUndecryptableSections(), "");
@@ -83,14 +90,13 @@
 
   // moving again should still preserve the moved state and also lead to an
   // abort
-  nearby_protocol::DeserializedV1Advertisement moved_again(std::move(adv));
+  const nearby_protocol::DeserializedV1Advertisement moved_again(
+      std::move(adv));
   ASSERT_DEATH(
-      [[maybe_unused]] auto failure =
-          moved_again.GetNumLegibleSections(), // NOLINT(bugprone-use-after-move
+      [[maybe_unused]] auto failure = moved_again.GetNumLegibleSections(), "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = moved_again.GetNumUndecryptableSections(),
       "");
-  ASSERT_DEATH([[maybe_unused]] auto failure =
-                   moved_again.GetNumUndecryptableSections(),
-               "");
   ASSERT_DEATH([[maybe_unused]] auto failure = moved_again.TryGetSection(0),
                "");
 }
@@ -99,14 +105,14 @@
   auto slab = nearby_protocol::CredentialSlab::TryCreate().value();
   auto book = nearby_protocol::CredentialBook::TryCreateFromSlab(slab).value();
   auto result = nearby_protocol::Deserializer::DeserializeAdvertisement(
-      V1AdvSimple, book);
+      V1AdvPlaintext, 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);
+      V1AdvPlaintext, book);
   ASSERT_EQ(another_result.GetKind(),
             np_ffi::internal::DeserializeAdvertisementResultKind::V1);
   auto adv2 = another_result.IntoV1();
@@ -119,7 +125,7 @@
   // free abort.
   ASSERT_DEATH(
       [[maybe_unused]] auto failure =
-          adv.GetNumLegibleSections(), // NOLINT(bugprone-use-after-move
+          adv.GetNumLegibleSections(),  // NOLINT(bugprone-use-after-move)
       "");
   ASSERT_DEATH(
       [[maybe_unused]] auto failure = adv.GetNumUndecryptableSections(), "");
@@ -128,30 +134,28 @@
   // 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
+      [[maybe_unused]] auto failure = moved_again.GetNumLegibleSections(), "");
+  ASSERT_DEATH(
+      [[maybe_unused]] auto failure = moved_again.GetNumUndecryptableSections(),
       "");
-  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) {
+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 v1_adv = nearby_protocol::Deserializer::DeserializeAdvertisement(
+                    V1AdvPlaintext, 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);
+      V1AdvPlaintext, book);
   return adv.GetKind() ==
          np_ffi::internal::DeserializeAdvertisementResultKind::V1;
 }
@@ -159,7 +163,9 @@
 TEST_F(NpCppTest, TestSectionOwnership) {
   auto maybe_credential_slab = nearby_protocol::CredentialSlab::TryCreate();
   ASSERT_TRUE(maybe_credential_slab.ok());
-  auto maybe_credential_book = nearby_protocol::CredentialBook::TryCreateFromSlab(maybe_credential_slab.value());
+  auto maybe_credential_book =
+      nearby_protocol::CredentialBook::TryCreateFromSlab(
+          maybe_credential_slab.value());
   ASSERT_TRUE(maybe_credential_book.ok());
 
   {

diff --git a/nearby/presence/np_ffi_core/Cargo.toml b/nearby/presence/np_ffi_core/Cargo.toml
index 0c14d1c..a6b21b0 100644
--- a/nearby/presence/np_ffi_core/Cargo.toml
+++ b/nearby/presence/np_ffi_core/Cargo.toml

@@ -11,6 +11,7 @@
 array_view.workspace = true
 ldt_np_adv.workspace = true
 np_adv = { workspace = true, features = ["alloc"] }
+np_adv_dynamic.workspace = true
 np_hkdf.workspace = true
 handle_map.workspace = true
 crypto_provider.workspace = true
@@ -21,5 +22,4 @@
 [features]
 default = ["rustcrypto"]
 rustcrypto = ["crypto_provider_default/rustcrypto", "crypto_provider_default/std"]
-opensslbssl = ["crypto_provider_default/opensslbssl"]
 boringssl = ["crypto_provider_default/boringssl"]

diff --git a/nearby/presence/np_ffi_core/src/common.rs b/nearby/presence/np_ffi_core/src/common.rs
index 6333db5..e90a072 100644
--- a/nearby/presence/np_ffi_core/src/common.rs
+++ b/nearby/presence/np_ffi_core/src/common.rs

@@ -15,12 +15,14 @@
 //! in order to define the interfaces in this crate's various modules.
 
 use array_view::ArrayView;
+use crypto_provider::{CryptoProvider, CryptoRng};
+use crypto_provider_default::CryptoProviderImpl;
 use handle_map::HandleNotPresentError;
-use lock_adapter::std::RwLock;
+use lock_adapter::std::{RwLock, RwLockWriteGuard};
 use lock_adapter::RwLock as _;
 use std::string::String;
 
-const DEFAULT_MAX_HANDLES: u32 = u32::MAX - 1;
+pub(crate) 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
@@ -61,6 +63,18 @@
     /// value will be set to `u32::MAX - 1`, which is the upper-bound
     /// on this value.
     max_num_deserialized_v1_advertisements: u32,
+
+    /// The maximum number of v0 advertisement builders
+    /// 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_v0_advertisement_builders: u32,
+
+    /// The maximum number of v1 advertisement builders
+    /// 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_v1_advertisement_builders: u32,
 }
 
 impl Default for CommonConfig {
@@ -77,6 +91,8 @@
             max_num_credential_books: DEFAULT_MAX_HANDLES,
             max_num_deserialized_v0_advertisements: DEFAULT_MAX_HANDLES,
             max_num_deserialized_v1_advertisements: DEFAULT_MAX_HANDLES,
+            max_num_v0_advertisement_builders: DEFAULT_MAX_HANDLES,
+            max_num_v1_advertisement_builders: DEFAULT_MAX_HANDLES,
         }
     }
     #[cfg(feature = "std")]
@@ -110,6 +126,12 @@
     pub(crate) fn max_num_deserialized_v1_advertisements(&self) -> u32 {
         self.max_num_deserialized_v1_advertisements
     }
+    pub(crate) fn max_num_v0_advertisement_builders(&self) -> u32 {
+        self.max_num_v0_advertisement_builders
+    }
+    pub(crate) fn max_num_v1_advertisement_builders(&self) -> u32 {
+        self.max_num_v1_advertisement_builders
+    }
     pub(crate) fn set_num_shards(&mut self, num_shards: u8) {
         self.num_shards = num_shards
     }
@@ -139,7 +161,7 @@
             DEFAULT_MAX_HANDLES.min(max_num_deserialized_v0_advertisements)
     }
 
-    /// Sets the maximum number of active handles to deserialized v0
+    /// Sets the maximum number of active handles to deserialized v1
     /// advertisements which may be active at any one time.
     /// Max value: `u32::MAX - 1`.
     pub fn set_max_num_deserialized_v1_advertisements(
@@ -149,6 +171,26 @@
         self.max_num_deserialized_v1_advertisements =
             DEFAULT_MAX_HANDLES.min(max_num_deserialized_v1_advertisements)
     }
+    /// Sets the maximum number of active handles to v0 advertisement
+    /// builders which may be active at any one time.
+    /// Max value: `u32::MAX - 1`.
+    pub fn set_max_num_v0_advertisement_builders(
+        &mut self,
+        max_num_v0_advertisement_builders: u32,
+    ) {
+        self.max_num_v0_advertisement_builders =
+            DEFAULT_MAX_HANDLES.min(max_num_v0_advertisement_builders)
+    }
+    /// Sets the maximum number of active handles to v1 advertisement
+    /// builders which may be active at any one time.
+    /// Max value: `u32::MAX - 1`.
+    pub fn set_max_num_v1_advertisement_builders(
+        &mut self,
+        max_num_v1_advertisement_builders: u32,
+    ) {
+        self.max_num_v1_advertisement_builders =
+            DEFAULT_MAX_HANDLES.min(max_num_v1_advertisement_builders)
+    }
 }
 
 static COMMON_CONFIG: RwLock<CommonConfig> = RwLock::new(CommonConfig::new());
@@ -168,6 +210,12 @@
 pub(crate) fn global_max_num_deserialized_v1_advertisements() -> u32 {
     COMMON_CONFIG.read().max_num_deserialized_v1_advertisements()
 }
+pub(crate) fn global_max_num_v0_advertisement_builders() -> u32 {
+    COMMON_CONFIG.read().max_num_v0_advertisement_builders()
+}
+pub(crate) fn global_max_num_v1_advertisement_builders() -> u32 {
+    COMMON_CONFIG.read().max_num_v1_advertisement_builders()
+}
 
 /// 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
@@ -241,6 +289,31 @@
     config.set_max_num_deserialized_v1_advertisements(max_num_deserialized_v1_advertisements);
 }
 
+/// Sets the maximum number of active handles to v0 advertisement
+/// builders 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 v0 advertisement builder.
+pub fn global_config_set_max_num_v0_advertisement_builders(max_num_v0_advertisement_builders: u32) {
+    let mut config = COMMON_CONFIG.write();
+    config.set_max_num_v0_advertisement_builders(max_num_v0_advertisement_builders);
+}
+
+/// Sets the maximum number of active handles to v1 advertisement
+/// builders 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 v1 advertisement builder.
+pub fn global_config_set_max_num_v1_advertisement_builders(max_num_v1_advertisement_builders: u32) {
+    let mut config = COMMON_CONFIG.write();
+    config.set_max_num_v1_advertisement_builders(max_num_v1_advertisement_builders);
+}
 // API surfaces:
 
 /// A result-type enum which tells the caller whether/not a deallocation
@@ -271,8 +344,12 @@
 
 impl RawAdvertisementPayload {
     /// Yields a slice of the bytes in this raw advertisement payload.
+    #[allow(clippy::unwrap_used)]
     pub fn as_slice(&self) -> &[u8] {
-        self.bytes.as_slice()
+        // The unwrapping here will never trigger a panic,
+        // because the byte-buffer is 255 bytes, the byte-length
+        // of which is the maximum value storable in a u8.
+        self.bytes.as_slice().unwrap()
     }
 }
 
@@ -289,6 +366,27 @@
     bytes: [u8; N],
 }
 
+/// A FFI safe wrapper of a fixed size array
+#[derive(Clone)]
+#[repr(C)]
+pub struct FixedSizeArray<const N: usize>([u8; N]);
+
+impl<const N: usize> FixedSizeArray<N> {
+    /// Constructs a byte-buffer from a Rust-side-derived owned array
+    pub(crate) fn from_array(bytes: [u8; N]) -> Self {
+        Self(bytes)
+    }
+    /// Yields a slice of the bytes
+    pub fn as_slice(&self) -> &[u8] {
+        self.0.as_slice()
+    }
+    /// De-structures this FFI-compatible fixed-size array
+    /// into a bare Rust fixed size array.
+    pub fn into_array(self) -> [u8; N] {
+        self.0
+    }
+}
+
 impl<const N: usize> ByteBuffer<N> {
     /// Constructs a byte-buffer from a Rust-side-derived
     /// ArrayView, which is assumed to be trusted to be
@@ -300,11 +398,39 @@
         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)]
+    pub fn as_slice(&self) -> Option<&[u8]> {
+        if self.len as usize <= N {
+            Some(&self.bytes[..(self.len as usize)])
+        } else {
+            None
+        }
     }
 }
 
+pub(crate) type CryptoRngImpl = <CryptoProviderImpl as CryptoProvider>::CryptoRng;
+
+pub(crate) struct LazyInitCryptoRng {
+    maybe_rng: Option<CryptoRngImpl>,
+}
+
+impl LazyInitCryptoRng {
+    const fn new() -> Self {
+        Self { maybe_rng: None }
+    }
+    pub(crate) fn get_rng(&mut self) -> &mut CryptoRngImpl {
+        self.maybe_rng.get_or_insert_with(CryptoRngImpl::new)
+    }
+}
+
+/// Shared, lazily-initialized cryptographically-secure
+/// RNG for all operations in the FFI core.
+static CRYPTO_RNG: RwLock<LazyInitCryptoRng> = RwLock::new(LazyInitCryptoRng::new());
+
+/// Gets a write guard to the (lazily-init) library-global crypto rng.
+pub(crate) fn get_global_crypto_rng() -> RwLockWriteGuard<'static, LazyInitCryptoRng> {
+    CRYPTO_RNG.write()
+}
+
 /// The DE type for an encrypted identity
 #[derive(Clone, Copy)]
 #[repr(u8)]
@@ -320,6 +446,17 @@
     Provisioned = 4,
 }
 
+impl From<EncryptedIdentityType> for np_adv::de_type::EncryptedIdentityDataElementType {
+    fn from(val: EncryptedIdentityType) -> np_adv::de_type::EncryptedIdentityDataElementType {
+        use np_adv::de_type::EncryptedIdentityDataElementType;
+        match val {
+            EncryptedIdentityType::Private => EncryptedIdentityDataElementType::Private,
+            EncryptedIdentityType::Trusted => EncryptedIdentityDataElementType::Trusted,
+            EncryptedIdentityType::Provisioned => EncryptedIdentityDataElementType::Provisioned,
+        }
+    }
+}
+
 impl From<np_adv::de_type::EncryptedIdentityDataElementType> for EncryptedIdentityType {
     fn from(value: np_adv::de_type::EncryptedIdentityDataElementType) -> Self {
         use np_adv::de_type::EncryptedIdentityDataElementType;
@@ -331,6 +468,16 @@
     }
 }
 
+/// Error returned if the bit representation of a supposedly-Rust-constructed
+/// -and-validated type actually doesn't correspond to the format of the
+/// data structure expected on the Rust side of the boundary, and performing
+/// further operations on the structure would yield unintended behavior.
+/// If this kind of error is being raised, the foreign lang code must
+/// be messing with stack-allocated data structures for this library
+/// in an entirely unexpected way.
+#[derive(Debug)]
+pub struct InvalidStackDataStructure;
+
 /// 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.

diff --git a/nearby/presence/np_ffi_core/src/credentials.rs b/nearby/presence/np_ffi_core/src/credentials.rs
index 0972d45..dad61ee 100644
--- a/nearby/presence/np_ffi_core/src/credentials.rs
+++ b/nearby/presence/np_ffi_core/src/credentials.rs

@@ -15,6 +15,7 @@
 
 use crate::common::*;
 use crate::utils::{FfiEnum, LocksLongerThan};
+use crypto_provider::ed25519::InvalidPublicKeyBytes;
 use crypto_provider_default::CryptoProviderImpl;
 use handle_map::{
     declare_handle_map, HandleLike, HandleMapDimensions, HandleMapFullError,
@@ -71,8 +72,10 @@
             pub_key,
         }
     }
-    fn into_internal(self) -> np_adv::credential::v1::V1DiscoveryCredential {
-        np_adv::credential::v1::V1DiscoveryCredential::new(
+    fn into_internal(
+        self,
+    ) -> Result<np_adv::credential::v1::V1DiscoveryCredential, InvalidPublicKeyBytes> {
+        np_adv::credential::v1::V1DiscoveryCredential::new::<CryptoProviderImpl>(
             self.key_seed,
             self.expected_unsigned_metadata_key_hmac,
             self.expected_signed_metadata_key_hmac,
@@ -164,11 +167,12 @@
         &mut self,
         discovery_credential: V1DiscoveryCredential,
         match_data: MatchedCredential,
-    ) {
-        let discovery_credential = discovery_credential.into_internal();
-        let matchable_credential =
-            np_adv::credential::MatchableCredential { discovery_credential, match_data };
-        self.v1_creds.push(matchable_credential);
+    ) -> Result<(), InvalidPublicKeyBytes> {
+        discovery_credential.into_internal().map(|discovery_credential| {
+            let matchable_credential =
+                np_adv::credential::MatchableCredential { discovery_credential, match_data };
+            self.v1_creds.push(matchable_credential);
+        })
     }
 }
 
@@ -200,22 +204,33 @@
     }
 }
 
-/// Result type for trying to add a credential to a credential-slab.
+/// Result type for trying to add a V1 credential to a credential-slab.
 #[repr(u8)]
-pub enum AddCredentialToSlabResult {
+pub enum AddV1CredentialToSlabResult {
+    /// We succeeded in adding the credential to the slab.
+    Success = 0,
+    /// The handle to the slab was actually invalid.
+    InvalidHandle = 1,
+    /// The provided public key bytes do not actually represent a valid "edwards y" format
+    /// or that said compressed point is not actually a point on the curve.
+    InvalidPublicKeyBytes = 2,
+}
+
+/// Result type for trying to add a V0 credential to a credential-slab.
+#[repr(u8)]
+pub enum AddV0CredentialToSlabResult {
     /// We succeeded in adding the credential to the slab.
     Success = 0,
     /// The handle to the slab was actually invalid.
     InvalidHandle = 1,
 }
 
-declare_handle_map! {
-    mod credential_slab {
-        #[dimensions = super::get_credential_slab_handle_map_dimensions()]
-        type CredentialSlab: HandleLike<Object = super::CredentialSlabInternals>;
-    }
+/// A `#[repr(C)]` handle to a value of type `CredentialSlabInternals`
+#[repr(C)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub struct CredentialSlab {
+    handle_id: u64,
 }
-use credential_slab::CredentialSlab;
 
 fn get_credential_slab_handle_map_dimensions() -> HandleMapDimensions {
     HandleMapDimensions {
@@ -224,6 +239,13 @@
     }
 }
 
+declare_handle_map!(
+    credential_slab,
+    super::get_credential_slab_handle_map_dimensions(),
+    super::CredentialSlab,
+    super::CredentialSlabInternals
+);
+
 impl CredentialSlab {
     /// Adds the given V0 discovery credential with some associated
     /// match-data to this credential slab.
@@ -231,13 +253,13 @@
         &self,
         discovery_credential: V0DiscoveryCredential,
         match_data: MatchedCredential,
-    ) -> AddCredentialToSlabResult {
+    ) -> AddV0CredentialToSlabResult {
         match self.get_mut() {
             Ok(mut write_guard) => {
                 write_guard.add_v0(discovery_credential, match_data);
-                AddCredentialToSlabResult::Success
+                AddV0CredentialToSlabResult::Success
             }
-            Err(_) => AddCredentialToSlabResult::InvalidHandle,
+            Err(_) => AddV0CredentialToSlabResult::InvalidHandle,
         }
     }
     /// Adds the given V1 discovery credential with some associated
@@ -246,13 +268,13 @@
         &self,
         discovery_credential: V1DiscoveryCredential,
         match_data: MatchedCredential,
-    ) -> AddCredentialToSlabResult {
+    ) -> AddV1CredentialToSlabResult {
         match self.get_mut() {
-            Ok(mut write_guard) => {
-                write_guard.add_v1(discovery_credential, match_data);
-                AddCredentialToSlabResult::Success
-            }
-            Err(_) => AddCredentialToSlabResult::InvalidHandle,
+            Ok(mut write_guard) => match write_guard.add_v1(discovery_credential, match_data) {
+                Ok(_) => AddV1CredentialToSlabResult::Success,
+                Err(_) => AddV1CredentialToSlabResult::InvalidPublicKeyBytes,
+            },
+            Err(_) => AddV1CredentialToSlabResult::InvalidHandle,
         }
     }
 }
@@ -298,13 +320,19 @@
     }
 }
 
-declare_handle_map! {
-    mod credential_book {
-        #[dimensions = super::get_credential_book_handle_map_dimensions()]
-        type CredentialBook: HandleLike<Object = super::CredentialBookInternals>;
-    }
+/// A `#[repr(C)]` handle to a value of type `CredentialBookInternals`
+#[repr(C)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub struct CredentialBook {
+    handle_id: u64,
 }
-pub use credential_book::CredentialBook;
+
+declare_handle_map!(
+    credential_book,
+    super::get_credential_book_handle_map_dimensions(),
+    super::CredentialBook,
+    super::CredentialBookInternals
+);
 
 /// Discriminant for `CreateCredentialBookResult`
 #[repr(u8)]
@@ -380,3 +408,66 @@
 pub fn deallocate_credential_slab(credential_slab: CredentialSlab) -> DeallocateResult {
     credential_slab.deallocate().map(|_| ()).into()
 }
+
+/// Cryptographic information about a particular V0 broadcast credential
+/// necessary to LDT-encrypt V0 advertisements.
+#[repr(C)]
+pub struct V0BroadcastCredential {
+    key_seed: [u8; 32],
+    metadata_key: [u8; 14],
+}
+
+impl V0BroadcastCredential {
+    /// Constructs a new `V0BroadcastCredential` from the given
+    /// key-seed and 14-byte metadata key.
+    ///
+    /// Safety: Since this representation requires transmission
+    /// of the raw bytes of sensitive cryptographic info over FFI,
+    /// foreign-lang code around how this information is maintained
+    /// deserves close scrutiny.
+    pub fn new(key_seed: [u8; 32], metadata_key: [u8; 14]) -> Self {
+        Self { key_seed, metadata_key }
+    }
+    pub(crate) fn into_internal(
+        self,
+    ) -> np_adv::credential::SimpleBroadcastCryptoMaterial<np_adv::credential::v0::V0> {
+        np_adv::credential::SimpleBroadcastCryptoMaterial::new(
+            self.key_seed,
+            np_adv::legacy::ShortMetadataKey(self.metadata_key),
+        )
+    }
+}
+
+/// Cryptographic information about a particular V1 broadcast credential
+/// necessary to encrypt V1 MIC-verified and signature-verified sections.
+#[repr(C)]
+pub struct V1BroadcastCredential {
+    key_seed: [u8; 32],
+    metadata_key: [u8; 16],
+    private_key: [u8; 32],
+}
+
+impl V1BroadcastCredential {
+    /// Constructs a new `V1BroadcastCredential` from the given
+    /// key-seed, 16-byte metadata key, and the raw bytes
+    /// of the ed25519 private key.
+    ///
+    /// Safety: Since this representation requires transmission
+    /// of the raw bytes of an ed25519 private key (and other
+    /// sensitive cryptographic info) over FFI, foreign-lang
+    /// code around how this information is maintained
+    /// deserves close scrutiny.
+    pub const fn new(key_seed: [u8; 32], metadata_key: [u8; 16], private_key: [u8; 32]) -> Self {
+        Self { key_seed, metadata_key, private_key }
+    }
+    pub(crate) fn into_internal(
+        self,
+    ) -> np_adv::credential::v1::SimpleSignedBroadcastCryptoMaterial {
+        let permit = crypto_provider::ed25519::RawPrivateKeyPermit::default();
+        np_adv::credential::v1::SimpleSignedBroadcastCryptoMaterial::new(
+            self.key_seed,
+            np_adv::MetadataKey(self.metadata_key),
+            crypto_provider::ed25519::PrivateKey::from_raw_private_key(self.private_key, &permit),
+        )
+    }
+}

diff --git a/nearby/presence/np_ffi_core/src/deserialize/mod.rs b/nearby/presence/np_ffi_core/src/deserialize.rs
similarity index 61%
rename from nearby/presence/np_ffi_core/src/deserialize/mod.rs
rename to nearby/presence/np_ffi_core/src/deserialize.rs
index 44510f6..09df8a4 100644
--- a/nearby/presence/np_ffi_core/src/deserialize/mod.rs
+++ b/nearby/presence/np_ffi_core/src/deserialize.rs

@@ -14,12 +14,14 @@
 //! Core NP Rust FFI structures and methods for advertisement deserialization.
 
 use crate::common::*;
-use crate::credentials::credential_book::CredentialBook;
+use crate::credentials::CredentialBook;
 use crate::deserialize::v0::*;
 use crate::deserialize::v1::*;
 use crate::utils::FfiEnum;
 use crypto_provider_default::CryptoProviderImpl;
-use handle_map::{HandleLike, HandleMapFullError, HandleNotPresentError};
+use handle_map::{
+    declare_handle_map, HandleLike, HandleMapDimensions, HandleMapFullError, HandleNotPresentError,
+};
 use np_adv::deserialization_arena;
 
 pub mod v0;
@@ -154,8 +156,8 @@
     deserialize_advertisement_from_slice(adv_payload.as_slice(), credential_book)
 }
 
-/// Errors returned from [`crate::deserialize::v0::v0_payload::V0Payload#decrypt_metadata`].
-pub enum DecryptMetadataError {
+/// Errors returned from attempting to decrypt metadata
+pub(crate) enum DecryptMetadataError {
     /// The advertisement payload handle was either deallocated
     /// or corresponds to a public advertisement, and so we
     /// don't have any metadata to decrypt.
@@ -163,3 +165,128 @@
     /// Decryption of the raw metadata bytes failed.
     DecryptionFailed,
 }
+
+/// The result of decrypting metadata from either a V0Payload or DeserializedV1Section
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum DecryptMetadataResult {
+    Success(DecryptedMetadata),
+    Error,
+}
+
+/// Discriminant for `DecryptMetadataResult`.
+#[repr(u8)]
+pub enum DecryptMetadataResultKind {
+    /// The attempt to decrypt the metadata of the associated credential succeeded
+    /// The associated payload may be obtained via
+    /// `DecryptMetadataResult#into_success`.
+    Success,
+    /// The attempt to decrypt the metadata failed, either the payload had no matching identity
+    /// ie it was a public advertisement OR the decrypt attempt itself was unsuccessful
+    Error,
+}
+
+impl FfiEnum for DecryptMetadataResult {
+    type Kind = DecryptMetadataResultKind;
+
+    fn kind(&self) -> Self::Kind {
+        match self {
+            DecryptMetadataResult::Success(_) => DecryptMetadataResultKind::Success,
+            DecryptMetadataResult::Error => DecryptMetadataResultKind::Error,
+        }
+    }
+}
+
+impl DecryptMetadataResult {
+    declare_enum_cast! {into_success, Success, DecryptedMetadata}
+}
+
+/// Internals of decrypted metadata
+pub struct DecryptedMetadataInternals {
+    decrypted_bytes: Box<[u8]>,
+}
+
+/// A `#[repr(C)]` handle to a value of type `DecryptedMetadataInternals`
+#[repr(C)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub struct DecryptedMetadata {
+    handle_id: u64,
+}
+
+declare_handle_map!(
+    decrypted_metadata,
+    super::get_decrypted_metadata_handle_map_dimensions(),
+    super::DecryptedMetadata,
+    super::DecryptedMetadataInternals
+);
+
+fn get_decrypted_metadata_handle_map_dimensions() -> HandleMapDimensions {
+    HandleMapDimensions { num_shards: global_num_shards(), max_active_handles: DEFAULT_MAX_HANDLES }
+}
+
+/// The pointer and length of the decrypted metadata byte buffer
+#[repr(C)]
+pub struct MetadataBufferParts {
+    ptr: *const u8,
+    len: usize,
+}
+
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum GetMetadataBufferPartsResult {
+    Success(MetadataBufferParts),
+    Error,
+}
+
+impl GetMetadataBufferPartsResult {
+    declare_enum_cast! {into_success, Success, MetadataBufferParts}
+}
+
+#[repr(u8)]
+#[allow(missing_docs)]
+pub enum GetMetadataBufferPartsResultKind {
+    Success = 0,
+    Error = 1,
+}
+
+impl FfiEnum for GetMetadataBufferPartsResult {
+    type Kind = GetMetadataBufferPartsResultKind;
+
+    fn kind(&self) -> Self::Kind {
+        match self {
+            GetMetadataBufferPartsResult::Success(_) => GetMetadataBufferPartsResultKind::Success,
+            GetMetadataBufferPartsResult::Error => GetMetadataBufferPartsResultKind::Error,
+        }
+    }
+}
+
+fn allocate_decrypted_metadata_handle(metadata: Vec<u8>) -> DecryptMetadataResult {
+    let allocate_result = DecryptedMetadata::allocate(move || DecryptedMetadataInternals {
+        decrypted_bytes: metadata.into_boxed_slice(),
+    });
+    match allocate_result {
+        Ok(decrypted) => DecryptMetadataResult::Success(decrypted),
+        Err(_) => DecryptMetadataResult::Error,
+    }
+}
+
+impl DecryptedMetadata {
+    /// Gets the raw parts, pointer + length representation of the metadata byte buffer
+    pub fn get_metadata_buffer_parts(&self) -> GetMetadataBufferPartsResult {
+        match self.get() {
+            Ok(metadata_internals) => {
+                let result = MetadataBufferParts {
+                    ptr: metadata_internals.decrypted_bytes.as_ptr(),
+                    len: metadata_internals.decrypted_bytes.len(),
+                };
+                GetMetadataBufferPartsResult::Success(result)
+            }
+            Err(_) => GetMetadataBufferPartsResult::Error,
+        }
+    }
+
+    /// Frees the underlying decrypted metadata buffer
+    pub fn deallocate_metadata(&self) -> DeallocateResult {
+        self.deallocate().map(|_| ()).into()
+    }
+}

diff --git a/nearby/presence/np_ffi_core/src/deserialize/v0.rs b/nearby/presence/np_ffi_core/src/deserialize/v0.rs
index a07b9d8..c4f117f 100644
--- a/nearby/presence/np_ffi_core/src/deserialize/v0.rs
+++ b/nearby/presence/np_ffi_core/src/deserialize/v0.rs

@@ -14,14 +14,15 @@
 //! Core NP Rust FFI structures and methods for v0 advertisement deserialization.
 
 use crate::common::*;
-use crate::credentials::credential_book::CredentialBook;
+use crate::credentials::CredentialBook;
 use crate::credentials::MatchedCredential;
-use crate::deserialize::DecryptMetadataError;
+use crate::deserialize::{
+    allocate_decrypted_metadata_handle, DecryptMetadataError, DecryptMetadataResult,
+};
 use crate::utils::{FfiEnum, LocksLongerThan};
+use crate::v0::V0DataElement;
 use crypto_provider_default::CryptoProviderImpl;
 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};
 use np_adv::HasIdentityMatch;
 use std::vec::Vec;
 
@@ -348,13 +349,19 @@
     }
 }
 
-declare_handle_map! {
-    mod v0_payload {
-        #[dimensions = super::get_v0_payload_handle_map_dimensions()]
-        type V0Payload: HandleLike<Object = super::V0PayloadInternals>;
-    }
+/// A `#[repr(C)]` handle to a value of type `V0PayloadInternals`
+#[repr(C)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub struct V0Payload {
+    handle_id: u64,
 }
-use v0_payload::V0Payload;
+
+declare_handle_map!(
+    v0_payload,
+    super::get_v0_payload_handle_map_dimensions(),
+    super::V0Payload,
+    super::V0PayloadInternals
+);
 
 use super::DeserializeAdvertisementError;
 
@@ -399,7 +406,7 @@
     }
 
     /// Gets the identity details for this V0 payload,
-    /// if this payload was associted with an identity
+    /// if this payload was associated with an identity
     /// (i.e: non-public advertisements).
     pub fn get_identity_details(&self) -> GetV0IdentityDetailsResult {
         match self.get() {
@@ -410,17 +417,13 @@
 
     /// Attempts to decrypt the metadata for the matched
     /// credential for this V0 payload (if any)
-    ///
-    /// Note that while this method is publicly exposed
-    /// from `np_ffi_core`, since it involves the (FFI-layer-unexpressed)
-    /// type `Vec<u8>`, a direct wrapper will not suffice,
-    /// and instead a language-specific binding will need to
-    /// be generated for this method which respects the
-    /// expected memory-management semantics of the target language.
-    pub fn decrypt_metadata(&self) -> Result<Vec<u8>, DecryptMetadataError> {
+    pub fn decrypt_metadata(&self) -> DecryptMetadataResult {
         match self.get() {
-            Ok(read_guard) => read_guard.decrypt_metadata(),
-            Err(_) => Err(DecryptMetadataError::EncryptedMetadataNotAvailable),
+            Ok(read_guard) => match read_guard.decrypt_metadata() {
+                Ok(decrypted_metadata) => allocate_decrypted_metadata_handle(decrypted_metadata),
+                Err(_) => DecryptMetadataResult::Error,
+            },
+            Err(_) => DecryptMetadataResult::Error,
         }
     }
 
@@ -466,208 +469,3 @@
 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.action.as_u32() })
-            }
-            PacketFlavorEnum::Ciphertext => {
-                Self::Encrypted(V0ActionBits { bitfield: value.action.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
-                    .action
-                    .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
-                    .action
-                    .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.action.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.action.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
index 4684f55..3bc056d 100644
--- a/nearby/presence/np_ffi_core/src/deserialize/v1.rs
+++ b/nearby/presence/np_ffi_core/src/deserialize/v1.rs

@@ -15,14 +15,14 @@
 
 use super::DeserializeAdvertisementError;
 use crate::common::*;
-use crate::credentials::credential_book::CredentialBook;
+use crate::credentials::CredentialBook;
 use crate::credentials::MatchedCredential;
-use crate::deserialize::DecryptMetadataError;
+use crate::deserialize::{allocate_decrypted_metadata_handle, DecryptMetadataResult};
 use crate::utils::*;
+use crate::v1::V1VerificationMode;
 use array_view::ArrayView;
 use crypto_provider_default::CryptoProviderImpl;
 use handle_map::{declare_handle_map, HandleLike, HandleMapDimensions};
-use legible_v1_sections::LegibleV1Sections;
 use np_adv::extended::deserialize::DataElementParseError;
 use np_adv::HasIdentityMatch;
 use std::vec::Vec;
@@ -150,13 +150,20 @@
     }
 }
 
-declare_handle_map! {
-    mod legible_v1_sections {
-        #[dimensions = super::get_legible_v1_sections_handle_map_dimensions()]
-        type LegibleV1Sections: HandleLike<Object = super::LegibleV1SectionsInternals>;
-    }
+/// A `#[repr(C)]` handle to a value of type `LegibleV1SectionsInternals`
+#[repr(C)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+struct LegibleV1Sections {
+    handle_id: u64,
 }
 
+declare_handle_map!(
+    legible_v1_sections,
+    super::get_legible_v1_sections_handle_map_dimensions(),
+    super::LegibleV1Sections,
+    super::LegibleV1SectionsInternals
+);
+
 impl LocksLongerThan<LegibleV1Sections> for CredentialBook {}
 
 impl LegibleV1Sections {
@@ -229,12 +236,15 @@
 
 /// The result of attempting to get a derived 16-byte salt
 /// for a given DE within a section.
-#[derive(Copy, Clone)]
 #[repr(C)]
 #[allow(missing_docs)]
 pub enum GetV1DE16ByteSaltResult {
     Error,
-    Success([u8; 16]),
+    Success(FixedSizeArray<16>),
+}
+
+impl GetV1DE16ByteSaltResult {
+    declare_enum_cast! {into_success, Success, FixedSizeArray<16>}
 }
 
 impl FfiEnum for GetV1DE16ByteSaltResult {
@@ -258,6 +268,7 @@
     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 {
         if self.identity.is_some() {
@@ -266,6 +277,7 @@
             DeserializedV1IdentityKind::Plaintext
         }
     }
+
     /// 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) {
@@ -273,6 +285,7 @@
             None => GetV1DEResult::Error,
         }
     }
+
     /// Attempts to get the directly-transmissible details about
     /// the deserialized V1 identity for this section. Does
     /// not include decrypted metadata bytes nor the section salt.
@@ -282,16 +295,19 @@
             None => GetV1IdentityDetailsResult::Error,
         }
     }
+
     /// Attempts to decrypt the metadata for the matched
     /// credential for this V1 section (if any).
-    pub(crate) fn decrypt_metadata(&self) -> Result<Vec<u8>, DecryptMetadataError> {
+    pub(crate) fn decrypt_metadata(&self) -> DecryptMetadataResult {
         match &self.identity {
-            None => Err(DecryptMetadataError::EncryptedMetadataNotAvailable),
-            Some(identity) => {
-                identity.decrypt_metadata().ok_or(DecryptMetadataError::DecryptionFailed)
-            }
+            None => DecryptMetadataResult::Error,
+            Some(identity) => match identity.decrypt_metadata() {
+                None => DecryptMetadataResult::Error,
+                Some(metadata) => allocate_decrypted_metadata_handle(metadata),
+            },
         }
     }
+
     /// Attempts to derive a 16-byte DE salt for a DE in this section
     /// with the given DE offset. This operation may fail if the
     /// passed offset is 255 (causes overflow) or if the section
@@ -411,32 +427,13 @@
     }
     /// For a given data-element offset, derives a 16-byte DE salt
     /// for a DE in that position within this section.
-    pub(crate) fn derive_16_byte_salt_for_offset(&self, de_offset: u8) -> Option<[u8; 16]> {
+    pub(crate) fn derive_16_byte_salt_for_offset(
+        &self,
+        de_offset: u8,
+    ) -> Option<FixedSizeArray<16>> {
         let section_salt = np_hkdf::v1_salt::V1Salt::<CryptoProviderImpl>::from(self.salt);
         let de_offset = np_hkdf::v1_salt::DataElementOffset::from(de_offset);
-        section_salt.derive::<16>(Some(de_offset))
-    }
-}
-
-/// Information about the verification scheme used
-/// for verifying the integrity of the contents
-/// of a decrypted section.
-#[derive(Clone, Copy)]
-#[repr(u8)]
-pub enum V1VerificationMode {
-    /// Message integrity code verification.
-    Mic = 0,
-    /// Signature verification.
-    Signature = 1,
-}
-
-impl From<np_adv::extended::deserialize::VerificationMode> for V1VerificationMode {
-    fn from(verification_mode: np_adv::extended::deserialize::VerificationMode) -> Self {
-        use np_adv::extended::deserialize::VerificationMode;
-        match verification_mode {
-            VerificationMode::Mic => Self::Mic,
-            VerificationMode::Signature => Self::Signature,
-        }
+        section_salt.derive::<16>(Some(de_offset)).map(FixedSizeArray::from_array)
     }
 }
 
@@ -550,23 +547,6 @@
         self.identity_tag
     }
 
-    fn apply_to_section_internals<R>(
-        &self,
-        func: impl FnOnce(&DeserializedV1SectionInternals) -> R,
-        lookup_failure_result: R,
-    ) -> R {
-        // 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) => func(section_ref),
-                    None => lookup_failure_result,
-                }
-            }
-            Err(_) => lookup_failure_result,
-        }
-    }
     /// Gets the DE with the given index in this section.
     pub fn get_de(&self, de_index: u8) -> GetV1DEResult {
         self.apply_to_section_internals(
@@ -587,10 +567,10 @@
     /// Attempts to decrypt the metadata for the matched
     /// credential for the V1 section referenced by
     /// this handle (if any).
-    pub fn decrypt_metadata(&self) -> Result<Vec<u8>, DecryptMetadataError> {
+    pub fn decrypt_metadata(&self) -> DecryptMetadataResult {
         self.apply_to_section_internals(
             DeserializedV1SectionInternals::decrypt_metadata,
-            Err(DecryptMetadataError::EncryptedMetadataNotAvailable),
+            DecryptMetadataResult::Error,
         )
     }
     /// Attempts to derive a 16-byte DE salt for a DE in this section
@@ -604,6 +584,24 @@
             GetV1DE16ByteSaltResult::Error,
         )
     }
+
+    fn apply_to_section_internals<R>(
+        &self,
+        func: impl FnOnce(&DeserializedV1SectionInternals) -> R,
+        lookup_failure_result: R,
+    ) -> R {
+        // 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) => func(section_ref),
+                    None => lookup_failure_result,
+                }
+            }
+            Err(_) => lookup_failure_result,
+        }
+    }
 }
 
 /// Discriminant for the `GetV1DEResult` enum.

diff --git a/nearby/presence/np_ffi_core/src/lib.rs b/nearby/presence/np_ffi_core/src/lib.rs
index 0c25168..2c03ea5 100644
--- a/nearby/presence/np_ffi_core/src/lib.rs
+++ b/nearby/presence/np_ffi_core/src/lib.rs

@@ -22,3 +22,6 @@
 pub mod common;
 pub mod credentials;
 pub mod deserialize;
+pub mod serialize;
+pub mod v0;
+pub mod v1;

diff --git a/nearby/presence/np_ffi_core/src/serialize.rs b/nearby/presence/np_ffi_core/src/serialize.rs
new file mode 100644
index 0000000..0aade0a
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/serialize.rs

@@ -0,0 +1,39 @@
+// 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 serialization.
+
+pub mod v0;
+pub mod v1;
+
+/// Enum common to V0 and V1 serialization expressing
+/// what kind of advertisement builder (public/encrypted)
+/// is in use.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum AdvertisementBuilderKind {
+    /// The builder is for a public advertisement.
+    Public = 0,
+    /// The builder is for an encrypted advertisement.
+    Encrypted = 1,
+}
+
+impl AdvertisementBuilderKind {
+    pub(crate) fn as_internal_v1(&self) -> np_adv::extended::serialize::AdvertisementType {
+        use np_adv::extended::serialize::AdvertisementType;
+        match self {
+            Self::Public => AdvertisementType::Plaintext,
+            Self::Encrypted => AdvertisementType::Encrypted,
+        }
+    }
+}

diff --git a/nearby/presence/np_ffi_core/src/serialize/v0.rs b/nearby/presence/np_ffi_core/src/serialize/v0.rs
new file mode 100644
index 0000000..2d6b413
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/serialize/v0.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.
+
+//! NP Rust FFI structures and methods for V0 advertisement serialization.
+
+use crate::common::*;
+use crate::credentials::V0BroadcastCredential;
+use crate::serialize::AdvertisementBuilderKind;
+use crate::utils::FfiEnum;
+use crate::v0::V0DataElement;
+use crypto_provider_default::CryptoProviderImpl;
+use handle_map::{declare_handle_map, HandleLike, HandleMapDimensions, HandleMapFullError};
+use np_adv;
+use np_adv_dynamic;
+
+/// A handle to a builder for V0 advertisements.
+#[derive(Clone, Copy)]
+#[repr(C)]
+pub struct V0AdvertisementBuilder {
+    kind: AdvertisementBuilderKind,
+    handle: V0AdvertisementBuilderHandle,
+}
+
+impl V0AdvertisementBuilder {
+    /// Attempts to add the given data element to the V0
+    /// advertisement builder behind this handle.
+    pub fn add_de(&self, de: V0DataElement) -> Result<AddV0DEResult, InvalidStackDataStructure> {
+        match self.handle.get_mut() {
+            Ok(mut adv_builder_write_guard) => adv_builder_write_guard.add_de(de),
+            Err(_) => Ok(AddV0DEResult::InvalidAdvertisementBuilderHandle),
+        }
+    }
+    /// Attempts to serialize the contents of the advertisement builder
+    /// behind this handle to bytes. Assuming that the handle is valid,
+    /// this operation will always result in the contents behind the
+    /// advertisement builder handle being deallocated.
+    pub fn into_advertisement(self) -> SerializeV0AdvertisementResult {
+        match self.handle.deallocate() {
+            Ok(adv_builder) => adv_builder.into_advertisement(),
+            Err(_) => SerializeV0AdvertisementResult::InvalidAdvertisementBuilderHandle,
+        }
+    }
+    /// Attempts to deallocate the V0 advertisement builder
+    /// behind this handle.
+    pub fn deallocate(self) -> DeallocateResult {
+        self.handle.deallocate().map(|_| ()).into()
+    }
+}
+
+/// Discriminant for `CreateV0AdvertisementBuilderResult`
+#[derive(Copy, Clone)]
+#[repr(u8)]
+pub enum CreateV0AdvertisementBuilderResultKind {
+    /// The attempt to create a new advertisement builder
+    /// failed since there are no more available
+    /// slots for V0 advertisement builders in their handle-map.
+    NoSpaceLeft = 0,
+    /// The attempt succeeded. The wrapped advertisement builder
+    /// may be obtained via
+    /// `CreateV0AdvertisementBuilderResult#into_success`.
+    Success = 1,
+}
+
+/// The result of attempting to create a new V0 advertisement builder.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum CreateV0AdvertisementBuilderResult {
+    NoSpaceLeft,
+    Success(V0AdvertisementBuilder),
+}
+
+impl From<Result<V0AdvertisementBuilder, HandleMapFullError>>
+    for CreateV0AdvertisementBuilderResult
+{
+    fn from(result: Result<V0AdvertisementBuilder, HandleMapFullError>) -> Self {
+        match result {
+            Ok(builder) => CreateV0AdvertisementBuilderResult::Success(builder),
+            Err(_) => CreateV0AdvertisementBuilderResult::NoSpaceLeft,
+        }
+    }
+}
+
+impl FfiEnum for CreateV0AdvertisementBuilderResult {
+    type Kind = CreateV0AdvertisementBuilderResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            CreateV0AdvertisementBuilderResult::NoSpaceLeft => {
+                CreateV0AdvertisementBuilderResultKind::NoSpaceLeft
+            }
+            CreateV0AdvertisementBuilderResult::Success(_) => {
+                CreateV0AdvertisementBuilderResultKind::Success
+            }
+        }
+    }
+}
+
+impl CreateV0AdvertisementBuilderResult {
+    declare_enum_cast! {into_success, Success, V0AdvertisementBuilder }
+}
+
+/// Creates a new V0 advertisement builder for a public advertisement.
+pub fn create_v0_public_advertisement_builder() -> CreateV0AdvertisementBuilderResult {
+    V0AdvertisementBuilderHandle::allocate(V0AdvertisementBuilderInternals::new_public)
+        .map(|handle| V0AdvertisementBuilder { kind: AdvertisementBuilderKind::Public, handle })
+        .into()
+}
+
+/// Creates a new V0 advertisement builder for an encrypted advertisement.
+pub fn create_v0_encrypted_advertisement_builder(
+    broadcast_cred: V0BroadcastCredential,
+    identity_type: EncryptedIdentityType,
+    salt: FixedSizeArray<2>,
+) -> CreateV0AdvertisementBuilderResult {
+    V0AdvertisementBuilderHandle::allocate(move || {
+        V0AdvertisementBuilderInternals::new_ldt(broadcast_cred, identity_type, salt.into_array())
+    })
+    .map(|handle| V0AdvertisementBuilder { kind: AdvertisementBuilderKind::Encrypted, handle })
+    .into()
+}
+
+impl V0AdvertisementBuilder {
+    /// Gets the kind of advertisement builder (public/encrypted)
+    pub fn kind(&self) -> AdvertisementBuilderKind {
+        self.kind
+    }
+}
+
+/// Discriminant for `SerializeV0AdvertisementResult`.
+#[repr(u8)]
+pub enum SerializeV0AdvertisementResultKind {
+    /// Serializing the advertisement to bytes was successful.
+    Success = 0,
+    /// Serializing the advertisement to bytes failed
+    /// because the data in the advertisement wasn't
+    /// of an appropriate size for LDT encryption
+    /// to succeed.
+    LdtError = 1,
+    /// The advertisement builder handle was invalid.
+    InvalidAdvertisementBuilderHandle = 2,
+}
+
+/// The result of attempting to serialize the contents
+/// of a V0 advertisement builder to raw bytes.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum SerializeV0AdvertisementResult {
+    Success(ByteBuffer<24>),
+    LdtError,
+    InvalidAdvertisementBuilderHandle,
+}
+
+impl SerializeV0AdvertisementResult {
+    declare_enum_cast! { into_success, Success, ByteBuffer<24> }
+}
+
+impl FfiEnum for SerializeV0AdvertisementResult {
+    type Kind = SerializeV0AdvertisementResultKind;
+    fn kind(&self) -> SerializeV0AdvertisementResultKind {
+        match self {
+            Self::Success(_) => SerializeV0AdvertisementResultKind::Success,
+            Self::LdtError => SerializeV0AdvertisementResultKind::LdtError,
+            Self::InvalidAdvertisementBuilderHandle => {
+                SerializeV0AdvertisementResultKind::InvalidAdvertisementBuilderHandle
+            }
+        }
+    }
+}
+
+/// Internal Rust-side implementation of a V0 advertisement builder.
+pub struct V0AdvertisementBuilderInternals {
+    adv_builder: np_adv_dynamic::legacy::BoxedAdvBuilder<CryptoProviderImpl>,
+}
+
+impl V0AdvertisementBuilderInternals {
+    pub(crate) fn new_public() -> Self {
+        Self::new(np_adv::PublicIdentity.into())
+    }
+    pub(crate) fn new_ldt(
+        broadcast_cred: V0BroadcastCredential,
+        identity_type: EncryptedIdentityType,
+        salt: [u8; 2],
+    ) -> Self {
+        // TODO: What do about salts? Need to prevent re-use fo the same salt,
+        // but have no current rich representation of used salts...
+        let salt = ldt_np_adv::LegacySalt::from(salt);
+        let identity_type = identity_type.into();
+        let internal_broadcast_cred = broadcast_cred.into_internal();
+        let identity = np_adv::legacy::serialize::LdtIdentity::new(
+            identity_type,
+            salt,
+            &internal_broadcast_cred,
+        );
+        Self::new(identity.into())
+    }
+    fn new(identity: np_adv_dynamic::legacy::BoxedIdentity<CryptoProviderImpl>) -> Self {
+        let adv_builder =
+            np_adv_dynamic::legacy::BoxedAdvBuilder::<CryptoProviderImpl>::new(identity);
+        Self { adv_builder }
+    }
+    fn add_de(&mut self, de: V0DataElement) -> Result<AddV0DEResult, InvalidStackDataStructure> {
+        let to_boxed = np_adv_dynamic::legacy::ToBoxedDataElementBundle::try_from(de)?;
+        use np_adv::legacy::serialize::AddDataElementError;
+        use np_adv_dynamic::legacy::BoxedAddDataElementError;
+        match self.adv_builder.add_data_element(to_boxed) {
+            Ok(_) => Ok(AddV0DEResult::Success),
+            Err(BoxedAddDataElementError::FlavorMismatchError) => {
+                Ok(AddV0DEResult::InvalidIdentityTypeForDataElement)
+            }
+            Err(BoxedAddDataElementError::UnderlyingError(
+                AddDataElementError::InsufficientAdvSpace,
+            )) => Ok(AddV0DEResult::InsufficientAdvertisementSpace),
+        }
+    }
+    fn into_advertisement(self) -> SerializeV0AdvertisementResult {
+        match self.adv_builder.into_advertisement() {
+            Ok(serialized_bytes) => {
+                let byte_buffer = ByteBuffer::from_array_view(serialized_bytes);
+                SerializeV0AdvertisementResult::Success(byte_buffer)
+            }
+            Err(np_adv_dynamic::legacy::BoxedAdvConstructionError::Ldt(_)) => {
+                SerializeV0AdvertisementResult::LdtError
+            }
+        }
+    }
+}
+
+fn get_v0_advertisement_builder_handle_map_dimensions() -> HandleMapDimensions {
+    HandleMapDimensions {
+        num_shards: global_num_shards(),
+        max_active_handles: global_max_num_v0_advertisement_builders(),
+    }
+}
+
+/// A `#[repr(C)]` handle to a value of type `V0AdvertisementBuilderInternals`
+#[repr(C)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+struct V0AdvertisementBuilderHandle {
+    handle_id: u64,
+}
+
+declare_handle_map!(
+    advertisement_builder,
+    super::get_v0_advertisement_builder_handle_map_dimensions(),
+    super::V0AdvertisementBuilderHandle,
+    super::V0AdvertisementBuilderInternals
+);
+
+/// Result code for the operation of adding a DE to a V0
+/// advertisement builder.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum AddV0DEResult {
+    /// The DE was successfully added to the advertisement builder
+    /// behind the given handle.
+    Success = 0,
+    /// The handle for the advertisement builder was invalid.
+    InvalidAdvertisementBuilderHandle = 1,
+    /// There was not enough available space left in the advertisement
+    /// to append the given data element.
+    InsufficientAdvertisementSpace = 2,
+    /// The passed data element is not broadcastable under the
+    /// identity type of the advertisement (public/private).
+    InvalidIdentityTypeForDataElement = 3,
+}
+
+impl From<np_adv_dynamic::legacy::BoxedAddDataElementError> for AddV0DEResult {
+    fn from(err: np_adv_dynamic::legacy::BoxedAddDataElementError) -> Self {
+        use np_adv_dynamic::legacy::BoxedAddDataElementError;
+        match err {
+            BoxedAddDataElementError::UnderlyingError(_) => Self::InsufficientAdvertisementSpace,
+            BoxedAddDataElementError::FlavorMismatchError => {
+                Self::InvalidIdentityTypeForDataElement
+            }
+        }
+    }
+}

diff --git a/nearby/presence/np_ffi_core/src/serialize/v1.rs b/nearby/presence/np_ffi_core/src/serialize/v1.rs
new file mode 100644
index 0000000..d48a725
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/serialize/v1.rs

@@ -0,0 +1,700 @@
+// 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 FFI structures and methods for V1 advertisement serialization.
+
+use crate::common::*;
+use crate::credentials::V1BroadcastCredential;
+use crate::serialize::AdvertisementBuilderKind;
+use crate::utils::FfiEnum;
+use crate::v1::V1VerificationMode;
+use crypto_provider_default::CryptoProviderImpl;
+use handle_map::{declare_handle_map, HandleLike, HandleMapDimensions, HandleMapFullError};
+use np_adv;
+use np_adv_dynamic;
+
+/// A handle to a builder for V1 advertisements.
+#[derive(Clone, Copy)]
+#[repr(C)]
+pub struct V1AdvertisementBuilder {
+    kind: AdvertisementBuilderKind,
+    handle: V1AdvertisementBuilderHandle,
+}
+
+impl V1AdvertisementBuilder {
+    /// Attempts to create a builder for a new public section within
+    /// this advertisement, returning a handle to the newly-created
+    /// section builder if successful.
+    ///
+    /// This method may fail if there is another currently-active
+    /// section builder for the same advertisement builder, if the
+    /// kind of section being added does not match the advertisement
+    /// type (public/encrypted), or if the section would not manage
+    /// to fit within the enclosing advertisement.
+    pub fn public_section_builder(&self) -> CreateV1SectionBuilderResult {
+        self.section_builder_internals(|internals| internals.public_section_builder())
+    }
+    /// Attempts to create a builder for a new encrypted section within
+    /// this advertisement, returning a handle to the newly-created
+    /// section builder if successful.
+    ///
+    /// The identity details for the new section builder may be specified
+    /// via providing the broadcast credential data, the kind of encrypted
+    /// identity being broadcast (private/trusted/provisioned), and the
+    /// verification mode (MIC/Signature) to be used for the encrypted section.
+    ///
+    /// This method may fail if there is another currently-active
+    /// section builder for the same advertisement builder, if the
+    /// kind of section being added does not match the advertisement
+    /// type (public/encrypted), or if the section would not manage
+    /// to fit within the enclosing advertisement.
+    pub fn encrypted_section_builder(
+        &self,
+        broadcast_cred: V1BroadcastCredential,
+        identity_type: EncryptedIdentityType,
+        verification_mode: V1VerificationMode,
+    ) -> CreateV1SectionBuilderResult {
+        self.section_builder_internals(move |internals| {
+            internals.encrypted_section_builder(broadcast_cred, identity_type, verification_mode)
+        })
+    }
+
+    /// Attempts to serialize the contents of the advertisement builder
+    /// behind this handle to bytes. Assuming that the handle is valid,
+    /// this operation will always result in the contents behind the
+    /// advertisement builder handle being deallocated.
+    pub fn into_advertisement(self) -> SerializeV1AdvertisementResult {
+        match self.handle.deallocate() {
+            Ok(adv_builder) => adv_builder.into_advertisement(),
+            Err(_) => SerializeV1AdvertisementResult::InvalidAdvertisementBuilderHandle,
+        }
+    }
+
+    fn section_builder_internals(
+        &self,
+        builder_supplier: impl FnOnce(
+            &mut V1AdvertisementBuilderInternals,
+        ) -> Result<usize, SectionBuilderError>,
+    ) -> CreateV1SectionBuilderResult {
+        match self.handle.get_mut() {
+            Ok(mut adv_builder_write_guard) => {
+                match builder_supplier(&mut adv_builder_write_guard) {
+                    Ok(section_index) => CreateV1SectionBuilderResult::Success(V1SectionBuilder {
+                        adv_builder: *self,
+                        section_index: section_index as u8,
+                    }),
+                    Err(e) => e.into(),
+                }
+            }
+            Err(_) => CreateV1SectionBuilderResult::InvalidAdvertisementBuilderHandle,
+        }
+    }
+}
+
+/// Discriminant for `CreateV1AdvertisementBuilderResult`
+#[derive(Copy, Clone)]
+#[repr(u8)]
+pub enum CreateV1AdvertisementBuilderResultKind {
+    /// The attempt to create a new advertisement builder
+    /// failed since there are no more available
+    /// slots for V1 advertisement builders in their handle-map.
+    NoSpaceLeft = 0,
+    /// The attempt succeeded. The wrapped advertisement builder
+    /// may be obtained via
+    /// `CreateV1AdvertisementBuilderResult#into_success`.
+    Success = 1,
+}
+
+/// The result of attempting to create a new V1 advertisement builder.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum CreateV1AdvertisementBuilderResult {
+    NoSpaceLeft,
+    Success(V1AdvertisementBuilder),
+}
+
+impl From<Result<V1AdvertisementBuilder, HandleMapFullError>>
+    for CreateV1AdvertisementBuilderResult
+{
+    fn from(result: Result<V1AdvertisementBuilder, HandleMapFullError>) -> Self {
+        match result {
+            Ok(builder) => CreateV1AdvertisementBuilderResult::Success(builder),
+            Err(_) => CreateV1AdvertisementBuilderResult::NoSpaceLeft,
+        }
+    }
+}
+
+impl FfiEnum for CreateV1AdvertisementBuilderResult {
+    type Kind = CreateV1AdvertisementBuilderResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            CreateV1AdvertisementBuilderResult::NoSpaceLeft => {
+                CreateV1AdvertisementBuilderResultKind::NoSpaceLeft
+            }
+            CreateV1AdvertisementBuilderResult::Success(_) => {
+                CreateV1AdvertisementBuilderResultKind::Success
+            }
+        }
+    }
+}
+
+impl CreateV1AdvertisementBuilderResult {
+    declare_enum_cast! {into_success, Success, V1AdvertisementBuilder }
+}
+
+/// Creates a new V1 advertisement builder for the given advertisement
+/// kind (public/encrypted).
+pub fn create_v1_advertisement_builder(
+    kind: AdvertisementBuilderKind,
+) -> CreateV1AdvertisementBuilderResult {
+    V1AdvertisementBuilderHandle::allocate(move || V1AdvertisementBuilderInternals::new(kind))
+        .map(|handle| V1AdvertisementBuilder { kind, handle })
+        .into()
+}
+
+impl V1AdvertisementBuilder {
+    /// Gets the kind of advertisement builder (public/encrypted)
+    pub fn kind(&self) -> AdvertisementBuilderKind {
+        self.kind
+    }
+}
+
+pub(crate) enum V1AdvertisementBuilderState {
+    /// Internal state for when we have an active advertisement
+    /// builder, but no currently-active section builder.
+    Advertisement(np_adv_dynamic::extended::BoxedAdvBuilder),
+    /// Internal state for when we have both an active advertisement
+    /// builder and an active section builder.
+    Section(
+        np_adv_dynamic::extended::BoxedSectionBuilder<
+            np_adv::extended::serialize::AdvBuilder,
+            CryptoProviderImpl,
+        >,
+    ),
+}
+
+/// Internal version of errors which may be raised when
+/// attempting to derive a new section builder from an
+/// advertisement builder.
+#[derive(Debug, Eq, PartialEq)]
+pub(crate) enum SectionBuilderError {
+    /// We're currently in the middle of building a section.
+    UnclosedActiveSection,
+    /// We're attempting to build a section with an identity
+    /// kind (public/encrypted) which doesn't match the kind
+    /// for the entire advertisement.
+    IdentityKindMismatch,
+    /// There isn't enough space for a new section, either
+    /// because the maximum section count has been exceeded
+    /// or because the advertisement is almost full, and
+    /// the minimum size of a section wouldn't fit.
+    NoSpaceLeft,
+}
+
+impl From<np_adv_dynamic::extended::BoxedAddSectionError> for SectionBuilderError {
+    fn from(err: np_adv_dynamic::extended::BoxedAddSectionError) -> Self {
+        use np_adv::extended::serialize::AddSectionError;
+        use np_adv_dynamic::extended::BoxedAddSectionError;
+        match err {
+            BoxedAddSectionError::IdentityRequiresSaltError
+            | BoxedAddSectionError::Underlying(AddSectionError::IncompatibleSectionType) => {
+                SectionBuilderError::IdentityKindMismatch
+            }
+            BoxedAddSectionError::Underlying(AddSectionError::InsufficientAdvSpace)
+            | BoxedAddSectionError::Underlying(AddSectionError::MaxSectionCountExceeded) => {
+                SectionBuilderError::NoSpaceLeft
+            }
+        }
+    }
+}
+
+/// Discriminant for `SerializeV1AdvertisementResult`.
+#[repr(u8)]
+pub enum SerializeV1AdvertisementResultKind {
+    /// Serializing the advertisement to bytes was successful.
+    Success = 0,
+    /// The state of the advertisement builder was invalid
+    /// for the builder to be closed for serialization, likely
+    /// because there was an unclosed section builder.
+    InvalidBuilderState = 1,
+    /// The advertisement builder handle was invalid.
+    InvalidAdvertisementBuilderHandle = 2,
+}
+
+/// The result of attempting to serialize the contents
+/// of a V1 advertisement builder to raw bytes.
+#[repr(C)]
+#[allow(missing_docs, clippy::large_enum_variant)]
+pub enum SerializeV1AdvertisementResult {
+    Success(ByteBuffer<250>),
+    InvalidBuilderState,
+    InvalidAdvertisementBuilderHandle,
+}
+
+impl SerializeV1AdvertisementResult {
+    declare_enum_cast! { into_success, Success, ByteBuffer<250> }
+}
+
+impl FfiEnum for SerializeV1AdvertisementResult {
+    type Kind = SerializeV1AdvertisementResultKind;
+    fn kind(&self) -> SerializeV1AdvertisementResultKind {
+        match self {
+            Self::Success(_) => SerializeV1AdvertisementResultKind::Success,
+            Self::InvalidBuilderState => SerializeV1AdvertisementResultKind::InvalidBuilderState,
+            Self::InvalidAdvertisementBuilderHandle => {
+                SerializeV1AdvertisementResultKind::InvalidAdvertisementBuilderHandle
+            }
+        }
+    }
+}
+
+/// Internal, Rust-side implementation of a V1 advertisement builder.
+pub struct V1AdvertisementBuilderInternals {
+    // Note: This is actually always populated from an external
+    // perspective in the absence of panics. We only need
+    // the `Option` in order to be able to take ownership
+    // and perform a state transition when needed.
+    state: Option<V1AdvertisementBuilderState>,
+}
+
+impl V1AdvertisementBuilderInternals {
+    pub(crate) fn new(kind: AdvertisementBuilderKind) -> Self {
+        let adv_type = kind.as_internal_v1();
+        let builder = np_adv::extended::serialize::AdvBuilder::new(adv_type);
+        let builder = builder.into();
+        let state = Some(V1AdvertisementBuilderState::Advertisement(builder));
+        Self { state }
+    }
+    /// Internals of section_builder-type routines. Upon success, yields the index
+    /// of the newly-added section builder.
+    pub(crate) fn section_builder_internal(
+        &mut self,
+        identity: np_adv_dynamic::extended::BoxedIdentity<CryptoProviderImpl>,
+    ) -> Result<usize, SectionBuilderError> {
+        let state = self.state.take();
+        match state {
+            Some(V1AdvertisementBuilderState::Advertisement(adv_builder)) => {
+                match adv_builder.into_section_builder::<CryptoProviderImpl>(identity) {
+                    Ok(section_builder) => {
+                        let section_index = section_builder.section_index();
+                        self.state = Some(V1AdvertisementBuilderState::Section(section_builder));
+                        Ok(section_index)
+                    }
+                    Err((adv_builder, err)) => {
+                        self.state = Some(V1AdvertisementBuilderState::Advertisement(adv_builder));
+                        Err(err.into())
+                    }
+                }
+            }
+            x => {
+                // Note: Technically, this case also would leave the `None` state
+                // if we ever entered into it, but we never transition to that
+                // state during normal operation.
+                self.state = x;
+                Err(SectionBuilderError::UnclosedActiveSection)
+            }
+        }
+    }
+
+    pub(crate) fn public_section_builder(&mut self) -> Result<usize, SectionBuilderError> {
+        let identity = np_adv_dynamic::extended::BoxedIdentity::PublicIdentity;
+        self.section_builder_internal(identity)
+    }
+    pub(crate) fn encrypted_section_builder(
+        &mut self,
+        broadcast_cred: V1BroadcastCredential,
+        identity_type: EncryptedIdentityType,
+        verification_mode: V1VerificationMode,
+    ) -> Result<usize, SectionBuilderError> {
+        let mut rng = get_global_crypto_rng();
+        let rng = rng.get_rng();
+        let identity_type = identity_type.into();
+        let internal_broadcast_cred = broadcast_cred.into_internal();
+        let identity = match verification_mode {
+            V1VerificationMode::Mic => {
+                let encoder = np_adv::extended::serialize::MicEncryptedSectionEncoder::<
+                    CryptoProviderImpl,
+                >::new_random_salt(
+                    rng, identity_type, &internal_broadcast_cred
+                );
+                np_adv_dynamic::extended::BoxedIdentity::MicEncrypted(encoder)
+            }
+            V1VerificationMode::Signature => {
+                let encoder = np_adv::extended::serialize::SignedEncryptedSectionEncoder::<
+                    CryptoProviderImpl,
+                >::new_random_salt(
+                    rng, identity_type, &internal_broadcast_cred
+                );
+                np_adv_dynamic::extended::BoxedIdentity::SignedEncrypted(encoder)
+            }
+        };
+        self.section_builder_internal(identity)
+    }
+    fn into_advertisement(self) -> SerializeV1AdvertisementResult {
+        match self.state {
+            Some(V1AdvertisementBuilderState::Advertisement(adv_builder)) => {
+                let array_view = adv_builder.into_advertisement().into_array_view();
+                SerializeV1AdvertisementResult::Success(ByteBuffer::from_array_view(array_view))
+            }
+            _ => SerializeV1AdvertisementResult::InvalidBuilderState,
+        }
+    }
+}
+
+fn get_v1_advertisement_builder_handle_map_dimensions() -> HandleMapDimensions {
+    HandleMapDimensions {
+        num_shards: global_num_shards(),
+        max_active_handles: global_max_num_v1_advertisement_builders(),
+    }
+}
+
+/// A `#[repr(C)]` handle to a value of type `V1AdvertisementBuilderInternals`
+#[repr(C)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+struct V1AdvertisementBuilderHandle {
+    handle_id: u64,
+}
+
+declare_handle_map!(
+    advertisement_builder,
+    super::get_v1_advertisement_builder_handle_map_dimensions(),
+    super::V1AdvertisementBuilderHandle,
+    super::V1AdvertisementBuilderInternals
+);
+
+/// Discriminant for `CreateV1SectionBuilderResult`
+#[derive(Copy, Clone)]
+#[repr(u8)]
+pub enum CreateV1SectionBuilderResultKind {
+    /// The attempt to create a new section builder succeeded.
+    Success = 0,
+    /// We're currently in the middle of building a section.
+    UnclosedActiveSection = 1,
+    /// The advertisement builder handle was invalid.
+    InvalidAdvertisementBuilderHandle = 2,
+    /// We're attempting to build a section with an identity
+    /// kind (public/encrypted) which doesn't match the kind
+    /// for the entire advertisement.
+    IdentityKindMismatch = 3,
+    /// There isn't enough space for a new section, either
+    /// because the maximum section count has been exceeded
+    /// or because the advertisement is almost full, and
+    /// the minimum size of a section wouldn't fit.
+    NoSpaceLeft = 4,
+}
+
+/// The result of attempting to create a new V1 section builder.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum CreateV1SectionBuilderResult {
+    Success(V1SectionBuilder),
+    UnclosedActiveSection,
+    InvalidAdvertisementBuilderHandle,
+    IdentityKindMismatch,
+    NoSpaceLeft,
+}
+
+impl FfiEnum for CreateV1SectionBuilderResult {
+    type Kind = CreateV1SectionBuilderResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            Self::Success(_) => CreateV1SectionBuilderResultKind::Success,
+            Self::UnclosedActiveSection => CreateV1SectionBuilderResultKind::UnclosedActiveSection,
+            Self::InvalidAdvertisementBuilderHandle => {
+                CreateV1SectionBuilderResultKind::InvalidAdvertisementBuilderHandle
+            }
+            Self::IdentityKindMismatch => CreateV1SectionBuilderResultKind::IdentityKindMismatch,
+            Self::NoSpaceLeft => CreateV1SectionBuilderResultKind::NoSpaceLeft,
+        }
+    }
+}
+
+impl CreateV1SectionBuilderResult {
+    declare_enum_cast! {into_success, Success, V1SectionBuilder}
+}
+
+impl From<SectionBuilderError> for CreateV1SectionBuilderResult {
+    fn from(err: SectionBuilderError) -> Self {
+        match err {
+            SectionBuilderError::UnclosedActiveSection => Self::UnclosedActiveSection,
+            SectionBuilderError::IdentityKindMismatch => Self::IdentityKindMismatch,
+            SectionBuilderError::NoSpaceLeft => Self::NoSpaceLeft,
+        }
+    }
+}
+
+/// Result code for [`V1SectionBuilder#add_to_advertisement`].
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum AddV1SectionToAdvertisementResult {
+    /// The section referenced by the given handle
+    /// couldn't be added to the containing advertisement,
+    /// possibly because the handle is invalid or the section
+    /// has already been added to the containing section.
+    Error = 0,
+    /// The section referenced by the given handle
+    /// was successfully added to the containing advertisement.
+    /// After obtaining this result code, the section
+    /// handle will no longer be valid.
+    Success = 1,
+}
+
+/// Result code for operations adding DEs to a section builder.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum AddV1DEResult {
+    /// The DE was successfully added to the section builder
+    /// behind the given handle.
+    Success = 0,
+    /// The handle for the section builder was invalid.
+    InvalidSectionHandle = 1,
+    /// There was no more space left in the advertisement
+    /// to fit the DE in the containing section.
+    InsufficientSectionSpace = 2,
+    /// The data element itself had invalid characteristics,
+    /// most likely a length above 127.
+    InvalidDataElement = 3,
+}
+
+/// Discriminant for `NextV1DE16ByteSaltResult`.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum NextV1DE16ByteSaltResultKind {
+    /// We couldn't return a 16-byte DE salt, possibly
+    /// because the handle to the section builder
+    /// was invalid, or possibly because the section
+    /// builder was for a public section.
+    Error = 0,
+    /// A 16-byte DE salt was returned successfully.
+    Success = 1,
+}
+
+/// The result of attempting to get the derived V1 DE
+/// 16-byte salt for the next-added DE to the section
+/// builder behind the given handle.
+#[derive(Clone)]
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum NextV1DE16ByteSaltResult {
+    Error,
+    Success(FixedSizeArray<16>),
+}
+
+impl FfiEnum for NextV1DE16ByteSaltResult {
+    type Kind = NextV1DE16ByteSaltResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            Self::Error => NextV1DE16ByteSaltResultKind::Error,
+            Self::Success(_) => NextV1DE16ByteSaltResultKind::Success,
+        }
+    }
+}
+
+impl NextV1DE16ByteSaltResult {
+    declare_enum_cast! {into_success, Success, FixedSizeArray<16> }
+}
+
+impl From<Option<np_adv::extended::serialize::DeSalt<CryptoProviderImpl>>>
+    for NextV1DE16ByteSaltResult
+{
+    fn from(maybe_salt: Option<np_adv::extended::serialize::DeSalt<CryptoProviderImpl>>) -> Self {
+        match maybe_salt.and_then(|salt| salt.derive::<16>()) {
+            Some(salt) => NextV1DE16ByteSaltResult::Success(FixedSizeArray::from_array(salt)),
+            None => NextV1DE16ByteSaltResult::Error,
+        }
+    }
+}
+
+/// A handle to a builder for V1 sections.
+#[derive(Clone, Copy)]
+#[repr(C)]
+pub struct V1SectionBuilder {
+    adv_builder: V1AdvertisementBuilder,
+    section_index: u8,
+}
+
+impl V1SectionBuilder {
+    /// Attempts to add the section constructed behind this handle
+    /// to a section builder to the containing advertisement it
+    /// originated from.
+    pub fn add_to_advertisement(self) -> AddV1SectionToAdvertisementResult {
+        match self.adv_builder.handle.get_mut() {
+            Ok(mut adv_builder) => {
+                let state = adv_builder.state.take();
+                match state {
+                    Some(V1AdvertisementBuilderState::Section(section_builder)) => {
+                        // Make sure the index of the section we're trying to close
+                        // matches the index of the section currently under construction.
+                        let actual_section_index = section_builder.section_index() as u8;
+                        if self.section_index == actual_section_index {
+                            let updated_adv_builder = section_builder.add_to_advertisement();
+                            adv_builder.state = Some(V1AdvertisementBuilderState::Advertisement(
+                                updated_adv_builder,
+                            ));
+                            AddV1SectionToAdvertisementResult::Success
+                        } else {
+                            adv_builder.state =
+                                Some(V1AdvertisementBuilderState::Section(section_builder));
+                            AddV1SectionToAdvertisementResult::Error
+                        }
+                    }
+                    x => {
+                        adv_builder.state = x;
+                        AddV1SectionToAdvertisementResult::Error
+                    }
+                }
+            }
+            Err(_) => AddV1SectionToAdvertisementResult::Error,
+        }
+    }
+
+    /// Attempts to get the derived 16-byte V1 DE salt for the next
+    /// DE to be added to this section builder. May fail if this
+    /// section builder handle is invalid, or if the section
+    /// is a public section.
+    pub fn next_de_salt(&self) -> NextV1DE16ByteSaltResult {
+        self.try_apply_to_internals(
+            |section_builder| section_builder.next_de_salt().into(),
+            NextV1DE16ByteSaltResult::Error,
+        )
+    }
+
+    /// Attempts to add the given DE to the section builder behind
+    /// this handle. The passed DE may have a payload of up to 127
+    /// bytes, the maximum for a V1 DE.
+    pub fn add_127_byte_buffer_de(&self, de: V1DE127ByteBuffer) -> AddV1DEResult {
+        match de.into_internal() {
+            Some(generic_de) => self
+                .add_de_internals(np_adv_dynamic::extended::BoxedWriteDataElement::new(generic_de)),
+            None => AddV1DEResult::InvalidDataElement,
+        }
+    }
+
+    fn add_de_internals(
+        &self,
+        de: np_adv_dynamic::extended::BoxedWriteDataElement,
+    ) -> AddV1DEResult {
+        self.try_apply_to_internals(
+            move |section_builder| match section_builder.add_de(move |_| de) {
+                Ok(_) => AddV1DEResult::Success,
+                Err(_) => AddV1DEResult::InsufficientSectionSpace,
+            },
+            AddV1DEResult::InvalidSectionHandle,
+        )
+    }
+
+    fn try_apply_to_internals<R>(
+        &self,
+        func: impl FnOnce(
+            &mut np_adv_dynamic::extended::BoxedSectionBuilder<
+                np_adv::extended::serialize::AdvBuilder,
+                CryptoProviderImpl,
+            >,
+        ) -> R,
+        invalid_handle_error: R,
+    ) -> R {
+        match self.adv_builder.handle.get_mut() {
+            Ok(mut adv_builder) => {
+                match adv_builder.state.as_mut() {
+                    Some(V1AdvertisementBuilderState::Section(ref mut section_builder)) => {
+                        // Check to make sure that the section index matches, otherwise
+                        // we have an invalid handle.
+                        let current_section_index = section_builder.section_index() as u8;
+                        if current_section_index == self.section_index {
+                            func(section_builder)
+                        } else {
+                            invalid_handle_error
+                        }
+                    }
+                    Some(V1AdvertisementBuilderState::Advertisement(_)) => invalid_handle_error,
+                    None => invalid_handle_error,
+                }
+            }
+            Err(_) => invalid_handle_error,
+        }
+    }
+}
+
+/// Represents the contents of a V1 DE whose payload
+/// is stored in a buffer which may contain up to 127 bytes,
+/// which is the maximum for any V1 DE.
+///
+/// This representation is stable, and so you may directly
+/// reference this struct's fields if you wish.
+#[repr(C)]
+//TODO: Partial unification with `deserialize::v1::GenericV1DataElement`?
+pub struct V1DE127ByteBuffer {
+    /// The DE type code of this generic data-element.
+    pub de_type: u32,
+    /// The raw data-element byte payload, up to
+    /// 127 bytes in length.
+    pub payload: ByteBuffer<127>,
+}
+
+impl V1DE127ByteBuffer {
+    /// Attempts to convert this FFI-friendly DE with a byte-buffer size of 127
+    /// to the internal representation of a generic DE. May fail in the case
+    /// where the underlying payload byte-buffer has an invalid length above 127.
+    fn into_internal(self) -> Option<np_adv::extended::data_elements::GenericDataElement> {
+        let de_type = np_adv::extended::de_type::DeType::from(self.de_type);
+        self.payload.as_slice().and_then(move |payload_slice| {
+            np_adv::extended::data_elements::GenericDataElement::try_from(de_type, payload_slice)
+                .ok()
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const EMPTY_BROADCAST_CRED: V1BroadcastCredential =
+        V1BroadcastCredential::new([0; 32], [0; 16], [0; 32]);
+
+    fn state_is_advertisement_building(adv_builder_state: &V1AdvertisementBuilderState) -> bool {
+        matches!(adv_builder_state, V1AdvertisementBuilderState::Advertisement(_))
+    }
+
+    #[allow(clippy::expect_used)]
+    #[test]
+    fn test_build_section_fails_with_outstanding_section() {
+        let mut adv_builder =
+            V1AdvertisementBuilderInternals::new(AdvertisementBuilderKind::Encrypted);
+
+        let adv_builder_state =
+            adv_builder.state.as_ref().expect("Adv builder state should be present.");
+        assert!(state_is_advertisement_building(adv_builder_state));
+        let section_index = adv_builder
+            .encrypted_section_builder(
+                EMPTY_BROADCAST_CRED,
+                EncryptedIdentityType::Private,
+                V1VerificationMode::Mic,
+            )
+            .expect("Should be able to build the first section.");
+        assert_eq!(section_index, 0);
+
+        assert!(adv_builder.state.is_some());
+        let adv_builder_state =
+            adv_builder.state.as_ref().expect("Adv builder state should be present.");
+        assert!(!state_is_advertisement_building(adv_builder_state));
+
+        let double_build_error = adv_builder
+            .encrypted_section_builder(
+                EMPTY_BROADCAST_CRED,
+                EncryptedIdentityType::Private,
+                V1VerificationMode::Mic,
+            )
+            .expect_err("Shouldn't be able to start a new section builder with an unclosed one.");
+        assert_eq!(double_build_error, SectionBuilderError::UnclosedActiveSection);
+    }
+}

diff --git a/nearby/presence/np_ffi_core/src/utils.rs b/nearby/presence/np_ffi_core/src/utils.rs
index e547a89..b1495b9 100644
--- a/nearby/presence/np_ffi_core/src/utils.rs
+++ b/nearby/presence/np_ffi_core/src/utils.rs

@@ -37,6 +37,7 @@
 ///
 /// If the enclosing enum turns out to not be the requested
 /// variant, the generated method will return `None`.
+#[macro_export]
 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),

diff --git a/nearby/presence/np_ffi_core/src/v0.rs b/nearby/presence/np_ffi_core/src/v0.rs
new file mode 100644
index 0000000..89a427c
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/v0.rs

@@ -0,0 +1,461 @@
+// 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-acessible V0 constructs for both of the
+//! serialization+deserialization flows.
+
+use crate::common::InvalidStackDataStructure;
+use crate::serialize::AdvertisementBuilderKind;
+use crate::utils::FfiEnum;
+use np_adv::legacy::actions::ActionsDataElement;
+use np_adv::legacy::{data_elements as np_adv_de, Ciphertext, PacketFlavorEnum, Plaintext};
+
+/// 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 TryFrom<V0DataElement> for np_adv_dynamic::legacy::ToBoxedDataElementBundle {
+    type Error = InvalidStackDataStructure;
+    fn try_from(de: V0DataElement) -> Result<Self, InvalidStackDataStructure> {
+        match de {
+            V0DataElement::TxPower(x) => x.try_into(),
+            V0DataElement::Actions(x) => x.try_into(),
+        }
+    }
+}
+
+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}
+}
+
+/// Discriminant for `BuildTxPowerResult`.
+#[repr(u8)]
+#[derive(Clone, Copy)]
+pub enum BuildTxPowerResultKind {
+    /// The transmission power was outside the
+    /// allowed -100dBm to 20dBm range.
+    OutOfRange = 0,
+    /// The transmission power was in range,
+    /// and so a `TxPower` struct was constructed.
+    Success = 1,
+}
+
+/// Result type for attempting to construct a
+/// Tx Power from a signed byte.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum BuildTxPowerResult {
+    OutOfRange,
+    Success(TxPower),
+}
+
+impl FfiEnum for BuildTxPowerResult {
+    type Kind = BuildTxPowerResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            Self::OutOfRange => BuildTxPowerResultKind::OutOfRange,
+            Self::Success(_) => BuildTxPowerResultKind::Success,
+        }
+    }
+}
+
+impl BuildTxPowerResult {
+    declare_enum_cast! {into_success, Success, TxPower}
+}
+
+/// 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 {
+    /// Attempts to construct a new TxPower from
+    /// the given signed-byte value.
+    pub fn build_from_signed_byte(tx_power: i8) -> BuildTxPowerResult {
+        match np_adv::shared_data::TxPower::try_from(tx_power) {
+            Ok(_) => BuildTxPowerResult::Success(Self { tx_power }),
+            Err(_) => BuildTxPowerResult::OutOfRange,
+        }
+    }
+    /// 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() }
+    }
+}
+
+impl TryFrom<TxPower> for np_adv_dynamic::legacy::ToBoxedDataElementBundle {
+    type Error = InvalidStackDataStructure;
+    fn try_from(value: TxPower) -> Result<Self, InvalidStackDataStructure> {
+        np_adv::shared_data::TxPower::try_from(value.as_i8())
+            .map_err(|_| InvalidStackDataStructure)
+            .map(|x| x.into())
+    }
+}
+
+/// Discriminant for `BuildContextSyncSeqNumResult`.
+#[repr(u8)]
+#[derive(Clone, Copy)]
+pub enum BuildContextSyncSeqNumResultKind {
+    /// The sequence number was outside the allowed
+    /// 0-15 single-nibble range.
+    OutOfRange = 0,
+    /// The sequence number was in range,
+    /// and so a `ContextSyncSeqNum` was constructed.
+    Success = 1,
+}
+
+/// Result type for attempting to construct a
+/// ContextSyncSeqNum from an unsigned byte.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum BuildContextSyncSeqNumResult {
+    OutOfRange,
+    Success(ContextSyncSeqNum),
+}
+
+impl FfiEnum for BuildContextSyncSeqNumResult {
+    type Kind = BuildContextSyncSeqNumResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            Self::OutOfRange => BuildContextSyncSeqNumResultKind::OutOfRange,
+            Self::Success(_) => BuildContextSyncSeqNumResultKind::Success,
+        }
+    }
+}
+
+impl BuildContextSyncSeqNumResult {
+    declare_enum_cast! {into_success, Success, ContextSyncSeqNum}
+}
+/// Representation of a context-sync sequence number.
+#[derive(Clone, Copy)]
+#[repr(C)]
+pub struct ContextSyncSeqNum {
+    value: u8,
+}
+
+impl ContextSyncSeqNum {
+    /// Attempts to build a new context sync sequence number
+    /// from the given unsigned byte.
+    pub fn build_from_unsigned_byte(value: u8) -> BuildContextSyncSeqNumResult {
+        match np_adv::shared_data::ContextSyncSeqNum::try_from(value) {
+            Ok(_) => BuildContextSyncSeqNumResult::Success(Self { value }),
+            Err(_) => BuildContextSyncSeqNumResult::OutOfRange,
+        }
+    }
+    /// Yields this context sync sequence number
+    /// as a u8.
+    pub fn as_u8(&self) -> u8 {
+        self.value
+    }
+}
+
+impl From<np_adv::shared_data::ContextSyncSeqNum> for ContextSyncSeqNum {
+    fn from(value: np_adv::shared_data::ContextSyncSeqNum) -> Self {
+        let value = value.as_u8();
+        Self { value }
+    }
+}
+
+impl TryFrom<ContextSyncSeqNum> for np_adv_dynamic::legacy::ToBoxedActionElement {
+    type Error = InvalidStackDataStructure;
+    fn try_from(value: ContextSyncSeqNum) -> Result<Self, Self::Error> {
+        let value = value.as_u8();
+        np_adv::shared_data::ContextSyncSeqNum::try_from(value)
+            .map(np_adv_dynamic::legacy::ToBoxedActionElement::ContextSyncSeqNum)
+            .map_err(|_| InvalidStackDataStructure)
+    }
+}
+
+/// Representation of the Actions DE in V0.
+#[derive(Clone, Copy)]
+#[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 TryFrom<V0Actions> for np_adv_dynamic::legacy::ToBoxedDataElementBundle {
+    type Error = InvalidStackDataStructure;
+    fn try_from(value: V0Actions) -> Result<Self, InvalidStackDataStructure> {
+        let boxed_action_bits = np_adv_dynamic::legacy::BoxedActionBits::try_from(value)?;
+        Ok(boxed_action_bits.into())
+    }
+}
+
+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.action.as_u32() })
+            }
+            PacketFlavorEnum::Ciphertext => {
+                Self::Encrypted(V0ActionBits { bitfield: value.action.as_u32() })
+            }
+        }
+    }
+}
+
+#[repr(C)]
+#[derive(Clone, Copy)]
+/// The bitfield data of a VOActions data element
+pub struct V0ActionBits {
+    bitfield: u32,
+}
+
+#[derive(Clone, Copy)]
+#[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 BooleanActionType {
+    pub(crate) fn as_boxed_action_element(
+        &self,
+        value: bool,
+    ) -> np_adv_dynamic::legacy::ToBoxedActionElement {
+        use np_adv_dynamic::legacy::ToBoxedActionElement;
+        match self {
+            Self::ActiveUnlock => ToBoxedActionElement::ActiveUnlock(value),
+            Self::NearbyShare => ToBoxedActionElement::NearbyShare(value),
+            Self::InstantTethering => ToBoxedActionElement::InstantTethering(value),
+            Self::PhoneHub => ToBoxedActionElement::PhoneHub(value),
+            Self::PresenceManager => ToBoxedActionElement::PresenceManager(value),
+            Self::Finder => ToBoxedActionElement::Finder(value),
+            Self::FastPairSass => ToBoxedActionElement::FastPairSass(value),
+        }
+    }
+}
+
+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
+            }
+        }
+    }
+}
+
+impl From<np_adv_dynamic::legacy::BoxedActionBits> for V0Actions {
+    fn from(bits: np_adv_dynamic::legacy::BoxedActionBits) -> Self {
+        use np_adv_dynamic::legacy::BoxedActionBits;
+        match bits {
+            BoxedActionBits::Plaintext(x) => Self::Plaintext(V0ActionBits { bitfield: x.as_u32() }),
+            BoxedActionBits::Ciphertext(x) => {
+                Self::Encrypted(V0ActionBits { bitfield: x.as_u32() })
+            }
+        }
+    }
+}
+
+impl TryFrom<V0Actions> for np_adv_dynamic::legacy::BoxedActionBits {
+    type Error = InvalidStackDataStructure;
+    fn try_from(actions: V0Actions) -> Result<Self, InvalidStackDataStructure> {
+        match actions {
+            V0Actions::Plaintext(action_bits) => {
+                let bits = np_adv::legacy::actions::ActionBits::<Plaintext>::try_from(
+                    action_bits.bitfield,
+                )
+                .map_err(|_| InvalidStackDataStructure)?;
+                Ok(bits.into())
+            }
+            V0Actions::Encrypted(action_bits) => {
+                let bits = np_adv::legacy::actions::ActionBits::<Ciphertext>::try_from(
+                    action_bits.bitfield,
+                )
+                .map_err(|_| InvalidStackDataStructure)?;
+                Ok(bits.into())
+            }
+        }
+    }
+}
+
+/// Discriminant for `SetV0ActionResult`.
+#[repr(u8)]
+pub enum SetV0ActionResultKind {
+    /// The attempt to set the action bit failed. The
+    /// action bits were yielded back to the caller,
+    /// unmodified.
+    Error = 0,
+    /// The attempt to set the action bit succeeded.
+    /// The updated action bits were yielded back to the caller.
+    Success = 1,
+}
+
+/// The result of attempting to set a particular action
+/// bit on some `V0Actions`.
+#[repr(C)]
+#[allow(missing_docs)]
+pub enum SetV0ActionResult {
+    Success(V0Actions),
+    Error(V0Actions),
+}
+
+impl FfiEnum for SetV0ActionResult {
+    type Kind = SetV0ActionResultKind;
+    fn kind(&self) -> Self::Kind {
+        match self {
+            Self::Success(_) => SetV0ActionResultKind::Success,
+            Self::Error(_) => SetV0ActionResultKind::Error,
+        }
+    }
+}
+
+impl SetV0ActionResult {
+    declare_enum_cast! { into_success, Success, V0Actions }
+    declare_enum_cast! { into_error, Error, V0Actions }
+}
+
+impl V0Actions {
+    /// Constructs a new V0 actions DE with no declared boolean
+    /// actions and a zeroed context sync sequence number,
+    /// where the DE is intended for the given advertisement
+    /// kind (plaintext/encrypted).
+    pub fn new_zeroed(kind: AdvertisementBuilderKind) -> Self {
+        match kind {
+            AdvertisementBuilderKind::Public => Self::Plaintext(V0ActionBits { bitfield: 0 }),
+            AdvertisementBuilderKind::Encrypted => Self::Encrypted(V0ActionBits { bitfield: 0 }),
+        }
+    }
+
+    /// 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, InvalidStackDataStructure> {
+        let boxed_action_bits = np_adv_dynamic::legacy::BoxedActionBits::try_from(*self)?;
+        let action_type = action_type.into();
+        Ok(boxed_action_bits.has_action(&action_type).expect("BooleanActionType only has one bit"))
+    }
+
+    /// Attempts to set the given action bit to the given boolean value.
+    /// This operation may fail if the requested action bit may not be
+    /// set for the kind of containing advertisement (public/encrypted)
+    /// that this action DE is intended to belong to. In this case,
+    /// the original action bits will be yielded back to the caller,
+    /// unaltered.
+    pub fn set_action(
+        self,
+        action_type: BooleanActionType,
+        value: bool,
+    ) -> Result<SetV0ActionResult, InvalidStackDataStructure> {
+        let mut boxed_action_bits = np_adv_dynamic::legacy::BoxedActionBits::try_from(self)?;
+        let boxed_action_element = action_type.as_boxed_action_element(value);
+        match boxed_action_bits.set_action(boxed_action_element) {
+            Ok(()) => Ok(SetV0ActionResult::Success(boxed_action_bits.into())),
+            Err(_) => Ok(SetV0ActionResult::Error(self)),
+        }
+    }
+
+    /// Sets the context sequence number for this data element.
+    #[allow(clippy::expect_used)]
+    pub fn set_context_sync_seq_num(
+        self,
+        value: ContextSyncSeqNum,
+    ) -> Result<Self, InvalidStackDataStructure> {
+        let mut boxed_action_bits = np_adv_dynamic::legacy::BoxedActionBits::try_from(self)?;
+        let boxed_action_element = np_adv_dynamic::legacy::ToBoxedActionElement::try_from(value)?;
+        boxed_action_bits
+            .set_action(boxed_action_element)
+            .expect("Context sync sequence number always may be present");
+        Ok(boxed_action_bits.into())
+    }
+
+    /// Return the context sequence number from this data element
+    #[allow(clippy::expect_used)]
+    pub fn get_context_sync_seq_num(&self) -> Result<ContextSyncSeqNum, InvalidStackDataStructure> {
+        let boxed_action_bits = np_adv_dynamic::legacy::BoxedActionBits::try_from(*self)?;
+        Ok(boxed_action_bits.get_context_sync_seq_num().into())
+    }
+}

diff --git a/nearby/presence/np_ffi_core/src/v1.rs b/nearby/presence/np_ffi_core/src/v1.rs
new file mode 100644
index 0000000..c7b564d
--- /dev/null
+++ b/nearby/presence/np_ffi_core/src/v1.rs

@@ -0,0 +1,38 @@
+// 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-acessible V1 constructs for both of the
+//! serialization+deserialization flows.
+
+/// Information about the verification scheme used
+/// for verifying the integrity of the contents
+/// of a decrypted section.
+#[derive(Clone, Copy)]
+#[repr(u8)]
+pub enum V1VerificationMode {
+    /// Message integrity code verification.
+    Mic = 0,
+    /// Signature verification.
+    Signature = 1,
+}
+
+impl From<np_adv::extended::deserialize::VerificationMode> for V1VerificationMode {
+    fn from(verification_mode: np_adv::extended::deserialize::VerificationMode) -> Self {
+        use np_adv::extended::deserialize::VerificationMode;
+        match verification_mode {
+            VerificationMode::Mic => Self::Mic,
+            VerificationMode::Signature => Self::Signature,
+        }
+    }
+}

diff --git a/nearby/presence/xts_aes/fuzz/Cargo.lock b/nearby/presence/xts_aes/fuzz/Cargo.lock
index 1844bd3..52831cd 100644
--- a/nearby/presence/xts_aes/fuzz/Cargo.lock
+++ b/nearby/presence/xts_aes/fuzz/Cargo.lock

@@ -55,9 +55,9 @@
 
 [[package]]
 name = "arbitrary"
-version = "1.3.0"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
+checksum = "7d5a26814d8dcb93b0e5a0ff3c6d80a8843bafb21b39e8e18a6f05471870e110"
 dependencies = [
  "derive_arbitrary",
 ]
@@ -92,9 +92,9 @@
 
 [[package]]
 name = "bytes"
-version = "1.4.0"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "cbc"
@@ -107,11 +107,12 @@
 
 [[package]]
 name = "cc"
-version = "1.0.79"
+version = "1.0.83"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
 dependencies = [
  "jobserver",
+ "libc",
 ]
 
 [[package]]
@@ -132,24 +133,24 @@
 
 [[package]]
 name = "const-oid"
-version = "0.9.4"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "795bc6e66a8e340f075fcf6227e417a2dc976b92b91f3cdc778bb858778b6747"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.9"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "crypto-bigint"
-version = "0.5.2"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
 dependencies = [
  "generic-array",
  "rand_core",
@@ -211,9 +212,9 @@
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0"
+version = "4.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
+checksum = "0a677b8922c94e01bdbb12126b0bc852f00447528dee1782229af9c720c3f348"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -227,9 +228,9 @@
 
 [[package]]
 name = "curve25519-dalek-derive"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -238,9 +239,9 @@
 
 [[package]]
 name = "der"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c7ed52955ce76b1554f509074bb357d3fb8ac9b51288a65a3fd480d1dfba946"
+checksum = "fffa369a668c8af7dbf8b5e56c9f744fbd399949ed171606040001947de40b1c"
 dependencies = [
  "const-oid",
  "zeroize",
@@ -248,9 +249,9 @@
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.1"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
+checksum = "67e77553c4162a157adbf834ebae5b415acbecbeafc7a74b0e886657506a7611"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -270,30 +271,31 @@
 
 [[package]]
 name = "ed25519"
-version = "2.2.1"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fb04eee5d9d907f29e80ee6b0e78f7e2c82342c63e3580d8c4f69d9d5aad963"
+checksum = "115531babc129696a58c64a4fef0a8bf9e9698629fb97e9e40767d235cfbcd53"
 dependencies = [
  "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "2.0.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+checksum = "4a3daa8e81a3963a60642bcc1f90a670680bd4a77535faa384e9d1c79d620871"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
  "rand_core",
  "sha2",
+ "subtle",
 ]
 
 [[package]]
 name = "elliptic-curve"
-version = "0.13.5"
+version = "0.13.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
 dependencies = [
  "base16ct",
  "crypto-bigint",
@@ -320,9 +322,9 @@
 
 [[package]]
 name = "fiat-crypto"
-version = "0.1.20"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+checksum = "1676f435fc1dadde4d03e43f5d62b259e1ce5f40bd4ffb21db2b42ebe59c1382"
 
 [[package]]
 name = "generic-array"
@@ -337,9 +339,9 @@
 
 [[package]]
 name = "getrandom"
-version = "0.2.10"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+checksum = "190092ea657667030ac6a35e305e62fc4dd69fd98ac98631e5d3a2b1575a12b5"
 dependencies = [
  "cfg-if",
  "libc",
@@ -369,9 +371,9 @@
 
 [[package]]
 name = "hkdf"
-version = "0.12.3"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791a029f6b9fc27657f6f188ec6e5e43f6911f6f878e0dc5501396e09809d437"
+checksum = "7b5f8eb2ad728638ea2c7d47a21db23b7b58a72ed6a38256b8a1849f15fbbdf7"
 dependencies = [
  "hmac",
 ]
@@ -397,9 +399,9 @@
 
 [[package]]
 name = "jobserver"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
+checksum = "8c37f63953c4c63420ed5fd3d6d398c719489b9f872b9fa683262f8edd363c7d"
 dependencies = [
  "libc",
 ]
@@ -413,15 +415,15 @@
 
 [[package]]
 name = "libc"
-version = "0.2.147"
+version = "0.2.153"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
 
 [[package]]
 name = "libfuzzer-sys"
-version = "0.4.6"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "beb09950ae85a0a94b27676cccf37da5ff13f27076aa1adbc6545dd0d0e1bd4e"
+checksum = "a96cfd5557eb82f2b83fed4955246c988d331975a002961b07c81584d107e7f7"
 dependencies = [
  "arbitrary",
  "cc",
@@ -430,9 +432,9 @@
 
 [[package]]
 name = "once_cell"
-version = "1.18.0"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "opaque-debug"
@@ -452,9 +454,9 @@
 
 [[package]]
 name = "platforms"
-version = "3.0.2"
+version = "3.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+checksum = "626dec3cac7cc0e1577a2ec3fc496277ec2baa084bebad95bb6fdbfae235f84c"
 
 [[package]]
 name = "polyval"
@@ -476,27 +478,27 @@
 
 [[package]]
 name = "primeorder"
-version = "0.13.2"
+version = "0.13.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
+checksum = "353e1ca18966c16d9deb1c69278edbc5f194139612772bd9537af60ac231e1e6"
 dependencies = [
  "elliptic-curve",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.31"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fe8a65d69dd0808184ebb5f836ab526bb259db23c657efa38711b1072ee47f0"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -553,15 +555,15 @@
 
 [[package]]
 name = "semver"
-version = "1.0.18"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+checksum = "b97ed7a9823b74f99c7742f5336af7be5ecd3eeafcb1507d1fa93347b1d589b0"
 
 [[package]]
 name = "sha2"
-version = "0.10.7"
+version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -570,9 +572,9 @@
 
 [[package]]
 name = "signature"
-version = "2.1.0"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
+checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
 
 [[package]]
 name = "subtle"
@@ -582,9 +584,9 @@
 
 [[package]]
 name = "syn"
-version = "2.0.26"
+version = "2.0.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "45c3457aacde3c65315de5031ec191ce46604304d2446e803d71ade03308d970"
+checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -599,15 +601,15 @@
 
 [[package]]
 name = "typenum"
-version = "1.16.0"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.11"
+version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "universal-hash"
@@ -633,9 +635,9 @@
 
 [[package]]
 name = "x25519-dalek"
-version = "2.0.0"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb66477291e7e8d2b0ff1bcb900bf29489a9692816d79874bea351e7a8b6de96"
+checksum = "c7e468321c81fb07fa7f4c636c3972b9100f0346e5b6a9f2bd0603a52f7ed277"
 dependencies = [
  "curve25519-dalek",
  "rand_core",
@@ -664,6 +666,6 @@
 
 [[package]]
 name = "zeroize"
-version = "1.6.0"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
+checksum = "525b4ec142c6b68a2d10f01f7bbf6755599ca3f81ea53b8431b7dd348f5fdb2d"

diff --git a/nearby/rustfmt.toml b/nearby/rustfmt.toml
index 10c1698..d45a5bf 100644
--- a/nearby/rustfmt.toml
+++ b/nearby/rustfmt.toml

@@ -1,3 +1,3 @@
 edition = "2021"
 newline_style = "Unix"
-use_small_heuristics = "Max"
+use_small_heuristics = "Max"
\ No newline at end of file

diff --git a/nearby/scripts/openssl-patches/0001-Apply-android-patches.patch b/nearby/scripts/openssl-patches/0001-Apply-android-patches.patch
deleted file mode 100644
index 0ee52b1..0000000
--- a/nearby/scripts/openssl-patches/0001-Apply-android-patches.patch
+++ /dev/null

@@ -1,1017 +0,0 @@
-From 5c9103f02cb56f0f04444b16dd67eeaa05429d47 Mon Sep 17 00:00:00 2001
-From: Nabil Wadih <nwadih@google.com>
-Date: Thu, 24 Aug 2023 15:51:26 -0700
-Subject: [PATCH] Apply android patches
-
----
- openssl/.cargo/config.toml |   2 +
- openssl/src/asn1.rs        |   2 +-
- openssl/src/bio.rs         |   6 +-
- openssl/src/bn.rs          |   2 +-
- openssl/src/cipher.rs      |   4 +
- openssl/src/dh.rs          |   2 +-
- openssl/src/dsa.rs         |   5 +-
- openssl/src/ec.rs          |  20 ++++
- openssl/src/ecdsa.rs       |   2 +-
- openssl/src/encrypt.rs     |   4 +-
- openssl/src/hash.rs        |   2 +-
- openssl/src/hkdf.rs        |  89 +++++++++++++++
- openssl/src/hmac.rs        | 217 +++++++++++++++++++++++++++++++++++++
- openssl/src/lib.rs         |  12 ++
- openssl/src/md_ctx.rs      |   2 +-
- openssl/src/pkey.rs        |  22 ++--
- openssl/src/pkey_ctx.rs    |  21 +++-
- openssl/src/rsa.rs         |   2 +-
- openssl/src/sign.rs        |  10 +-
- openssl/src/symm.rs        |   7 +-
- openssl/src/x509/mod.rs    |  52 +++++++--
- 21 files changed, 439 insertions(+), 46 deletions(-)
- create mode 100644 openssl/.cargo/config.toml
- create mode 100644 openssl/src/hkdf.rs
- create mode 100644 openssl/src/hmac.rs
-
-diff --git a/openssl/.cargo/config.toml b/openssl/.cargo/config.toml
-new file mode 100644
-index 00000000..e2b197d8
---- /dev/null
-+++ b/openssl/.cargo/config.toml
-@@ -0,0 +1,2 @@
-+[patch.crates-io]
-+bssl-ffi = { package = "bssl-sys", version = "0.1.0", path = "../../../boringssl/build/rust", optional=true }
-diff --git a/openssl/src/asn1.rs b/openssl/src/asn1.rs
-index b02f9ac4..939a1732 100644
---- a/openssl/src/asn1.rs
-+++ b/openssl/src/asn1.rs
-@@ -651,7 +651,7 @@ impl fmt::Debug for Asn1ObjectRef {
- }
- 
- cfg_if! {
--    if #[cfg(any(ossl110, libressl273))] {
-+    if #[cfg(any(ossl110, libressl273, boringssl))] {
-         use ffi::ASN1_STRING_get0_data;
-     } else {
-         #[allow(bad_style)]
-diff --git a/openssl/src/bio.rs b/openssl/src/bio.rs
-index 6a72552a..03242188 100644
---- a/openssl/src/bio.rs
-+++ b/openssl/src/bio.rs
-@@ -4,7 +4,7 @@ use std::marker::PhantomData;
- use std::ptr;
- use std::slice;
- 
--use crate::cvt_p;
-+use crate::{cvt_p, SignedLenType};
- use crate::error::ErrorStack;
- 
- pub struct MemBioSlice<'a>(*mut ffi::BIO, PhantomData<&'a [u8]>);
-@@ -25,7 +25,7 @@ impl<'a> MemBioSlice<'a> {
-         let bio = unsafe {
-             cvt_p(BIO_new_mem_buf(
-                 buf.as_ptr() as *const _,
--                buf.len() as c_int,
-+                buf.len() as SignedLenType,
-             ))?
-         };
- 
-@@ -78,7 +78,7 @@ cfg_if! {
-         use ffi::BIO_new_mem_buf;
-     } else {
-         #[allow(bad_style)]
--        unsafe fn BIO_new_mem_buf(buf: *const ::libc::c_void, len: ::libc::c_int) -> *mut ffi::BIO {
-+        unsafe fn BIO_new_mem_buf(buf: *const ::libc::c_void, len: SignedLenType) -> *mut ffi::BIO {
-             ffi::BIO_new_mem_buf(buf as *mut _, len)
-         }
-     }
-diff --git a/openssl/src/bn.rs b/openssl/src/bn.rs
-index 1cd00dd4..dbd7ae94 100644
---- a/openssl/src/bn.rs
-+++ b/openssl/src/bn.rs
-@@ -814,7 +814,7 @@ impl BigNumRef {
-     /// assert_eq!(&bn_vec, &[0, 0, 0x45, 0x43]);
-     /// ```
-     #[corresponds(BN_bn2binpad)]
--    #[cfg(ossl110)]
-+    #[cfg(any(boringssl, ossl110))]
-     pub fn to_vec_padded(&self, pad_to: i32) -> Result<Vec<u8>, ErrorStack> {
-         let mut v = Vec::with_capacity(pad_to as usize);
-         unsafe {
-diff --git a/openssl/src/cipher.rs b/openssl/src/cipher.rs
-index ab5f49d2..84a82654 100644
---- a/openssl/src/cipher.rs
-+++ b/openssl/src/cipher.rs
-@@ -208,6 +208,7 @@ impl Cipher {
-         unsafe { CipherRef::from_ptr(ffi::EVP_aes_192_cfb1() as *mut _) }
-     }
- 
-+    #[cfg(not(boringssl))]
-     pub fn aes_192_cfb128() -> &'static CipherRef {
-         unsafe { CipherRef::from_ptr(ffi::EVP_aes_192_cfb128() as *mut _) }
-     }
-@@ -253,6 +254,7 @@ impl Cipher {
-         unsafe { CipherRef::from_ptr(ffi::EVP_aes_256_cfb1() as *mut _) }
-     }
- 
-+    #[cfg(not(boringssl))]
-     pub fn aes_256_cfb128() -> &'static CipherRef {
-         unsafe { CipherRef::from_ptr(ffi::EVP_aes_256_cfb128() as *mut _) }
-     }
-@@ -282,11 +284,13 @@ impl Cipher {
-     }
- 
-     #[cfg(not(osslconf = "OPENSSL_NO_BF"))]
-+    #[cfg(not(boringssl))]
-     pub fn bf_cbc() -> &'static CipherRef {
-         unsafe { CipherRef::from_ptr(ffi::EVP_bf_cbc() as *mut _) }
-     }
- 
-     #[cfg(not(osslconf = "OPENSSL_NO_BF"))]
-+    #[cfg(not(boringssl))]
-     pub fn bf_ecb() -> &'static CipherRef {
-         unsafe { CipherRef::from_ptr(ffi::EVP_bf_ecb() as *mut _) }
-     }
-diff --git a/openssl/src/dh.rs b/openssl/src/dh.rs
-index 12170b99..e781543e 100644
---- a/openssl/src/dh.rs
-+++ b/openssl/src/dh.rs
-@@ -239,7 +239,7 @@ where
- }
- 
- cfg_if! {
--    if #[cfg(any(ossl110, libressl270))] {
-+    if #[cfg(any(ossl110, libressl270, boringssl))] {
-         use ffi::{DH_set0_pqg, DH_get0_pqg, DH_get0_key, DH_set0_key};
-     } else {
-         #[allow(bad_style)]
-diff --git a/openssl/src/dsa.rs b/openssl/src/dsa.rs
-index 5f59ba8a..0aceeb55 100644
---- a/openssl/src/dsa.rs
-+++ b/openssl/src/dsa.rs
-@@ -7,6 +7,7 @@
- 
- use cfg_if::cfg_if;
- use foreign_types::{ForeignType, ForeignTypeRef};
-+#[cfg(not(boringssl))]
- use libc::c_int;
- use std::fmt;
- use std::mem;
-@@ -283,7 +284,7 @@ impl<T> fmt::Debug for Dsa<T> {
- }
- 
- cfg_if! {
--    if #[cfg(any(ossl110, libressl273))] {
-+    if #[cfg(any(ossl110, libressl273, boringssl))] {
-         use ffi::{DSA_get0_key, DSA_get0_pqg, DSA_set0_key, DSA_set0_pqg};
-     } else {
-         #[allow(bad_style)]
-@@ -462,7 +463,7 @@ impl DsaSigRef {
- }
- 
- cfg_if! {
--    if #[cfg(any(ossl110, libressl273))] {
-+    if #[cfg(any(ossl110, libressl273, boringssl))] {
-         use ffi::{DSA_SIG_set0, DSA_SIG_get0};
-     } else {
-         #[allow(bad_style)]
-diff --git a/openssl/src/ec.rs b/openssl/src/ec.rs
-index 24b38322..20785428 100644
---- a/openssl/src/ec.rs
-+++ b/openssl/src/ec.rs
-@@ -954,6 +954,26 @@ impl EcKey<Private> {
-         EcKey<Private>,
-         ffi::d2i_ECPrivateKey
-     }
-+
-+    /// Decodes a DER-encoded elliptic curve private key structure for the specified curve.
-+    #[corresponds(EC_KEY_parse_private_key)]
-+    #[cfg(boringssl)]
-+    pub fn private_key_from_der_for_group(
-+        der: &[u8],
-+        group: &EcGroupRef,
-+    ) -> Result<EcKey<Private>, ErrorStack> {
-+        unsafe {
-+            let mut cbs = ffi::CBS {
-+                data: der.as_ptr(),
-+                len: der.len(),
-+            };
-+            cvt_p(ffi::EC_KEY_parse_private_key(
-+                &mut cbs as *mut ffi::CBS,
-+                group.as_ptr(),
-+            ))
-+            .map(|p| EcKey::from_ptr(p))
-+        }
-+    }
- }
- 
- impl<T> Clone for EcKey<T> {
-diff --git a/openssl/src/ecdsa.rs b/openssl/src/ecdsa.rs
-index 0a960e7b..f3b27b39 100644
---- a/openssl/src/ecdsa.rs
-+++ b/openssl/src/ecdsa.rs
-@@ -110,7 +110,7 @@ impl EcdsaSigRef {
- }
- 
- cfg_if! {
--    if #[cfg(any(ossl110, libressl273))] {
-+    if #[cfg(any(ossl110, libressl273, boringssl))] {
-         use ffi::{ECDSA_SIG_set0, ECDSA_SIG_get0};
-     } else {
-         #[allow(bad_style)]
-diff --git a/openssl/src/encrypt.rs b/openssl/src/encrypt.rs
-index 3cb10fcc..34a9eb8b 100644
---- a/openssl/src/encrypt.rs
-+++ b/openssl/src/encrypt.rs
-@@ -148,7 +148,7 @@ impl<'a> Encrypter<'a> {
-     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_oaep_md`].
-     ///
-     /// [`EVP_PKEY_CTX_set_rsa_oaep_md`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set_rsa_oaep_md.html
--    #[cfg(any(ossl102, libressl310))]
-+    #[cfg(any(ossl102, libressl310, boringssl))]
-     pub fn set_rsa_oaep_md(&mut self, md: MessageDigest) -> Result<(), ErrorStack> {
-         unsafe {
-             cvt(ffi::EVP_PKEY_CTX_set_rsa_oaep_md(
-@@ -352,7 +352,7 @@ impl<'a> Decrypter<'a> {
-     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_oaep_md`].
-     ///
-     /// [`EVP_PKEY_CTX_set_rsa_oaep_md`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set_rsa_oaep_md.html
--    #[cfg(any(ossl102, libressl310))]
-+    #[cfg(any(ossl102, libressl310, boringssl))]
-     pub fn set_rsa_oaep_md(&mut self, md: MessageDigest) -> Result<(), ErrorStack> {
-         unsafe {
-             cvt(ffi::EVP_PKEY_CTX_set_rsa_oaep_md(
-diff --git a/openssl/src/hash.rs b/openssl/src/hash.rs
-index 8e27505a..7f6fa89e 100644
---- a/openssl/src/hash.rs
-+++ b/openssl/src/hash.rs
-@@ -43,7 +43,7 @@ use crate::nid::Nid;
- use crate::{cvt, cvt_p};
- 
- cfg_if! {
--    if #[cfg(ossl110)] {
-+    if #[cfg(any(ossl110, boringssl))] {
-         use ffi::{EVP_MD_CTX_free, EVP_MD_CTX_new};
-     } else {
-         use ffi::{EVP_MD_CTX_create as EVP_MD_CTX_new, EVP_MD_CTX_destroy as EVP_MD_CTX_free};
-diff --git a/openssl/src/hkdf.rs b/openssl/src/hkdf.rs
-new file mode 100644
-index 00000000..cc7e5b3a
---- /dev/null
-+++ b/openssl/src/hkdf.rs
-@@ -0,0 +1,89 @@
-+use crate::cvt;
-+use crate::error::ErrorStack;
-+use crate::md::MdRef;
-+use foreign_types::ForeignTypeRef;
-+use openssl_macros::corresponds;
-+
-+/// Computes HKDF (as specified by RFC 5869).
-+///
-+/// HKDF is an Extract-and-Expand algorithm. It does not do any key stretching,
-+/// and as such, is not suited to be used alone to generate a key from a
-+/// password.
-+#[corresponds(HKDF)]
-+#[inline]
-+pub fn hkdf(
-+    out_key: &mut [u8],
-+    md: &MdRef,
-+    secret: &[u8],
-+    salt: &[u8],
-+    info: &[u8],
-+) -> Result<(), ErrorStack> {
-+    unsafe {
-+        cvt(ffi::HKDF(
-+            out_key.as_mut_ptr(),
-+            out_key.len(),
-+            md.as_ptr(),
-+            secret.as_ptr(),
-+            secret.len(),
-+            salt.as_ptr(),
-+            salt.len(),
-+            info.as_ptr(),
-+            info.len(),
-+        ))?;
-+    }
-+
-+    Ok(())
-+}
-+
-+/// Computes a HKDF PRK (as specified by RFC 5869).
-+///
-+/// WARNING: This function orders the inputs differently from RFC 5869
-+/// specification. Double-check which parameter is the secret/IKM and which is
-+/// the salt when using.
-+#[corresponds(HKDF_extract)]
-+#[inline]
-+pub fn hkdf_extract<'a>(
-+    out_key: &'a mut [u8],
-+    md: &MdRef,
-+    secret: &[u8],
-+    salt: &[u8],
-+) -> Result<&'a [u8], ErrorStack> {
-+    let mut out_len = out_key.len();
-+    unsafe {
-+        cvt(ffi::HKDF_extract(
-+            out_key.as_mut_ptr(),
-+            &mut out_len,
-+            md.as_ptr(),
-+            secret.as_ptr(),
-+            secret.len(),
-+            salt.as_ptr(),
-+            salt.len(),
-+        ))?;
-+    }
-+
-+    Ok(&out_key[..out_len])
-+}
-+
-+/// Computes a HKDF OKM (as specified by RFC 5869).
-+#[corresponds(HKDF_expand)]
-+#[inline]
-+pub fn hkdf_expand(
-+    out_key: &mut [u8],
-+    md: &MdRef,
-+    prk: &[u8],
-+    info: &[u8],
-+) -> Result<(), ErrorStack> {
-+    unsafe {
-+        cvt(ffi::HKDF_expand(
-+            out_key.as_mut_ptr(),
-+            out_key.len(),
-+            md.as_ptr(),
-+            prk.as_ptr(),
-+            prk.len(),
-+            info.as_ptr(),
-+            info.len(),
-+        ))?;
-+    }
-+
-+    Ok(())
-+}
-diff --git a/openssl/src/hmac.rs b/openssl/src/hmac.rs
-new file mode 100644
-index 00000000..465781e2
---- /dev/null
-+++ b/openssl/src/hmac.rs
-@@ -0,0 +1,217 @@
-+use crate::error::ErrorStack;
-+use crate::md::MdRef;
-+use crate::{cvt, cvt_p};
-+use ffi::HMAC_CTX;
-+use foreign_types::ForeignTypeRef;
-+use libc::{c_uint, c_void};
-+use openssl_macros::corresponds;
-+use std::convert::TryFrom;
-+use std::ptr;
-+
-+/// Computes the HMAC as a one-shot operation.
-+///
-+/// Calculates the HMAC of data, using the given |key|
-+/// and hash function |md|, and returns the result re-using the space from
-+/// buffer |out|. On entry, |out| must contain at least |EVP_MD_size| bytes
-+/// of space. The actual length of the result is used to resize the returned
-+/// slice. An output size of |EVP_MAX_MD_SIZE| will always be large enough.
-+/// It returns a resized |out| or ErrorStack on error.
-+#[corresponds(HMAC)]
-+#[inline]
-+pub fn hmac<'a>(
-+    md: &MdRef,
-+    key: &[u8],
-+    data: &[u8],
-+    out: &'a mut [u8],
-+) -> Result<&'a [u8], ErrorStack> {
-+    assert!(out.len() >= md.size());
-+    let mut out_len = c_uint::try_from(out.len()).unwrap();
-+    unsafe {
-+        cvt_p(ffi::HMAC(
-+            md.as_ptr(),
-+            key.as_ptr() as *const c_void,
-+            key.len(),
-+            data.as_ptr(),
-+            data.len(),
-+            out.as_mut_ptr(),
-+            &mut out_len,
-+        ))?;
-+    }
-+    Ok(&out[..out_len as usize])
-+}
-+
-+/// A context object used to perform HMAC operations.
-+///
-+/// HMAC is a MAC (message authentication code), i.e. a keyed hash function used for message
-+/// authentication, which is based on a hash function.
-+///
-+/// Note: Only available in boringssl. For openssl, use `PKey::hmac` instead.
-+#[cfg(boringssl)]
-+pub struct HmacCtx {
-+    ctx: *mut HMAC_CTX,
-+    output_size: usize,
-+}
-+
-+#[cfg(boringssl)]
-+impl HmacCtx {
-+    /// Creates a new [HmacCtx] to use the hash function `md` and key `key`.
-+    #[corresponds(HMAC_Init_ex)]
-+    pub fn new(key: &[u8], md: &MdRef) -> Result<Self, ErrorStack> {
-+        unsafe {
-+            // Safety: If an error occurred, the resulting null from HMAC_CTX_new is converted into
-+            // ErrorStack in the returned result by `cvt_p`.
-+            let ctx = cvt_p(ffi::HMAC_CTX_new())?;
-+            // Safety:
-+            // - HMAC_Init_ex must be called with a context previously created with HMAC_CTX_new,
-+            //   which is the line above.
-+            // - HMAC_Init_ex may return an error if key is null but the md is different from
-+            //   before. This is avoided here since key is guaranteed to be non-null.
-+            cvt(ffi::HMAC_Init_ex(
-+                ctx,
-+                key.as_ptr() as *const c_void,
-+                key.len(),
-+                md.as_ptr(),
-+                ptr::null_mut(),
-+            ))?;
-+            Ok(Self {
-+                ctx,
-+                output_size: md.size(),
-+            })
-+        }
-+    }
-+
-+    /// `update` can be called repeatedly with chunks of the message `data` to be authenticated.
-+    #[corresponds(HMAC_Update)]
-+    pub fn update(&mut self, data: &[u8]) -> Result<(), ErrorStack> {
-+        unsafe {
-+            // Safety: HMAC_Update returns 0 on error, and that is converted into ErrorStack in the
-+            // returned result by `cvt`.
-+            cvt(ffi::HMAC_Update(self.ctx, data.as_ptr(), data.len())).map(|_| ())
-+        }
-+    }
-+
-+    /// Finishes the HMAC process, and places the message authentication code in `output`.
-+    /// The number of bytes written to `output` is returned.
-+    ///
-+    /// # Panics
-+    ///
-+    /// Panics if the `output` is smaller than the required size. The output size is indicated by
-+    /// `md.size()` for the `Md` instance passed in [new]. An output size of |EVP_MAX_MD_SIZE| will
-+    /// always be large enough.
-+    #[corresponds(HMAC_Final)]
-+    pub fn finalize(&mut self, output: &mut [u8]) -> Result<usize, ErrorStack> {
-+        assert!(output.len() >= self.output_size);
-+        unsafe {
-+            // Safety: The length assertion above makes sure that `HMAC_Final` will not write longer
-+            // than the length of `output`.
-+            let mut size: c_uint = 0;
-+            cvt(ffi::HMAC_Final(
-+                self.ctx,
-+                output.as_mut_ptr(),
-+                &mut size as *mut c_uint,
-+            ))
-+            .map(|_| size as usize)
-+        }
-+    }
-+}
-+
-+impl Drop for HmacCtx {
-+    #[corresponds(HMAC_CTX_free)]
-+    fn drop(&mut self) {
-+        unsafe {
-+            ffi::HMAC_CTX_free(self.ctx);
-+        }
-+    }
-+}
-+
-+#[cfg(test)]
-+mod tests {
-+    use super::*;
-+    use crate::md::Md;
-+
-+    const SHA_256_DIGEST_SIZE: usize = 32;
-+
-+    #[test]
-+    fn hmac_sha256_test() {
-+        let expected_hmac = [
-+            0xb0, 0x34, 0x4c, 0x61, 0xd8, 0xdb, 0x38, 0x53, 0x5c, 0xa8, 0xaf, 0xce, 0xaf, 0xb,
-+            0xf1, 0x2b, 0x88, 0x1d, 0xc2, 0x0, 0xc9, 0x83, 0x3d, 0xa7, 0x26, 0xe9, 0x37, 0x6c,
-+            0x2e, 0x32, 0xcf, 0xf7,
-+        ];
-+        let mut out: [u8; SHA_256_DIGEST_SIZE] = [0; SHA_256_DIGEST_SIZE];
-+        let key: [u8; 20] = [0x0b; 20];
-+        let data = b"Hi There";
-+        let hmac_result =
-+            hmac(Md::sha256(), &key, data, &mut out).expect("Couldn't calculate sha256 hmac");
-+        assert_eq!(&hmac_result, &expected_hmac);
-+    }
-+
-+    #[test]
-+    #[should_panic]
-+    fn hmac_sha256_output_too_short() {
-+        let mut out = vec![0_u8; 1];
-+        let key: [u8; 20] = [0x0b; 20];
-+        let data = b"Hi There";
-+        hmac(Md::sha256(), &key, data, &mut out).expect("Couldn't calculate sha256 hmac");
-+    }
-+
-+    #[test]
-+    fn hmac_sha256_test_big_buffer() {
-+        let expected_hmac = [
-+            0xb0, 0x34, 0x4c, 0x61, 0xd8, 0xdb, 0x38, 0x53, 0x5c, 0xa8, 0xaf, 0xce, 0xaf, 0xb,
-+            0xf1, 0x2b, 0x88, 0x1d, 0xc2, 0x0, 0xc9, 0x83, 0x3d, 0xa7, 0x26, 0xe9, 0x37, 0x6c,
-+            0x2e, 0x32, 0xcf, 0xf7,
-+        ];
-+        let mut out: [u8; 100] = [0; 100];
-+        let key: [u8; 20] = [0x0b; 20];
-+        let data = b"Hi There";
-+        let hmac_result =
-+            hmac(Md::sha256(), &key, data, &mut out).expect("Couldn't calculate sha256 hmac");
-+        assert_eq!(hmac_result.len(), SHA_256_DIGEST_SIZE);
-+        assert_eq!(&hmac_result, &expected_hmac);
-+    }
-+
-+    #[test]
-+    fn hmac_sha256_update_test() {
-+        let expected_hmac = [
-+            0xb0, 0x34, 0x4c, 0x61, 0xd8, 0xdb, 0x38, 0x53, 0x5c, 0xa8, 0xaf, 0xce, 0xaf, 0xb,
-+            0xf1, 0x2b, 0x88, 0x1d, 0xc2, 0x0, 0xc9, 0x83, 0x3d, 0xa7, 0x26, 0xe9, 0x37, 0x6c,
-+            0x2e, 0x32, 0xcf, 0xf7,
-+        ];
-+        let mut out: [u8; SHA_256_DIGEST_SIZE] = [0; SHA_256_DIGEST_SIZE];
-+        let key: [u8; 20] = [0x0b; 20];
-+        let data = b"Hi There";
-+        let mut hmac_ctx = HmacCtx::new(&key, Md::sha256()).unwrap();
-+        hmac_ctx.update(data).unwrap();
-+        let size = hmac_ctx.finalize(&mut out).unwrap();
-+        assert_eq!(&out, &expected_hmac);
-+        assert_eq!(size, SHA_256_DIGEST_SIZE);
-+    }
-+
-+    #[test]
-+    fn hmac_sha256_update_chunks_test() {
-+        let expected_hmac = [
-+            0xb0, 0x34, 0x4c, 0x61, 0xd8, 0xdb, 0x38, 0x53, 0x5c, 0xa8, 0xaf, 0xce, 0xaf, 0xb,
-+            0xf1, 0x2b, 0x88, 0x1d, 0xc2, 0x0, 0xc9, 0x83, 0x3d, 0xa7, 0x26, 0xe9, 0x37, 0x6c,
-+            0x2e, 0x32, 0xcf, 0xf7,
-+        ];
-+        let mut out: [u8; SHA_256_DIGEST_SIZE] = [0; SHA_256_DIGEST_SIZE];
-+        let key: [u8; 20] = [0x0b; 20];
-+        let mut hmac_ctx = HmacCtx::new(&key, Md::sha256()).unwrap();
-+        hmac_ctx.update(b"Hi").unwrap();
-+        hmac_ctx.update(b" There").unwrap();
-+        let size = hmac_ctx.finalize(&mut out).unwrap();
-+        assert_eq!(&out, &expected_hmac);
-+        assert_eq!(size, SHA_256_DIGEST_SIZE);
-+    }
-+
-+    #[test]
-+    #[should_panic]
-+    fn hmac_sha256_update_output_too_short() {
-+        let mut out = vec![0_u8; 1];
-+        let key: [u8; 20] = [0x0b; 20];
-+        let mut hmac_ctx = HmacCtx::new(&key, Md::sha256()).unwrap();
-+        hmac_ctx.update(b"Hi There").unwrap();
-+        hmac_ctx.finalize(&mut out).unwrap();
-+    }
-+}
-diff --git a/openssl/src/lib.rs b/openssl/src/lib.rs
-index 891651ec..e8d07d8a 100644
---- a/openssl/src/lib.rs
-+++ b/openssl/src/lib.rs
-@@ -120,6 +120,9 @@
- #![doc(html_root_url = "https://docs.rs/openssl/0.10")]
- #![warn(rust_2018_idioms)]
- 
-+#[cfg(all(soong, boringssl))]
-+extern crate bssl_ffi as ffi;
-+
- #[doc(inline)]
- pub use ffi::init;
- 
-@@ -155,6 +158,10 @@ pub mod ex_data;
- #[cfg(not(any(libressl, ossl300)))]
- pub mod fips;
- pub mod hash;
-+#[cfg(boringssl)]
-+pub mod hkdf;
-+#[cfg(boringssl)]
-+pub mod hmac;
- #[cfg(ossl300)]
- pub mod lib_ctx;
- pub mod md;
-@@ -189,6 +196,11 @@ type LenType = libc::size_t;
- #[cfg(not(boringssl))]
- type LenType = libc::c_int;
- 
-+#[cfg(boringssl)]
-+type SignedLenType = libc::ssize_t;
-+#[cfg(not(boringssl))]
-+type SignedLenType = libc::c_int;
-+
- #[inline]
- fn cvt_p<T>(r: *mut T) -> Result<*mut T, ErrorStack> {
-     if r.is_null() {
-diff --git a/openssl/src/md_ctx.rs b/openssl/src/md_ctx.rs
-index c4d3f06b..156f3c2f 100644
---- a/openssl/src/md_ctx.rs
-+++ b/openssl/src/md_ctx.rs
-@@ -93,7 +93,7 @@ use std::convert::TryFrom;
- use std::ptr;
- 
- cfg_if! {
--    if #[cfg(ossl110)] {
-+    if #[cfg(any(ossl110, boringssl))] {
-         use ffi::{EVP_MD_CTX_free, EVP_MD_CTX_new};
-     } else {
-         use ffi::{EVP_MD_CTX_create as EVP_MD_CTX_new, EVP_MD_CTX_destroy as EVP_MD_CTX_free};
-diff --git a/openssl/src/pkey.rs b/openssl/src/pkey.rs
-index 2039e7e9..21ba7118 100644
---- a/openssl/src/pkey.rs
-+++ b/openssl/src/pkey.rs
-@@ -47,7 +47,7 @@ use crate::dh::Dh;
- use crate::dsa::Dsa;
- use crate::ec::EcKey;
- use crate::error::ErrorStack;
--#[cfg(ossl110)]
-+#[cfg(any(boringssl, ossl110))]
- use crate::pkey_ctx::PkeyCtx;
- use crate::rsa::Rsa;
- use crate::symm::Cipher;
-@@ -86,14 +86,14 @@ impl Id {
-     pub const DH: Id = Id(ffi::EVP_PKEY_DH);
-     pub const EC: Id = Id(ffi::EVP_PKEY_EC);
- 
--    #[cfg(ossl110)]
-+    #[cfg(any(boringssl, ossl110))]
-     pub const HKDF: Id = Id(ffi::EVP_PKEY_HKDF);
- 
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub const ED25519: Id = Id(ffi::EVP_PKEY_ED25519);
-     #[cfg(ossl111)]
-     pub const ED448: Id = Id(ffi::EVP_PKEY_ED448);
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub const X25519: Id = Id(ffi::EVP_PKEY_X25519);
-     #[cfg(ossl111)]
-     pub const X448: Id = Id(ffi::EVP_PKEY_X448);
-@@ -252,7 +252,7 @@ where
-     /// This function only works for algorithms that support raw public keys.
-     /// Currently this is: [`Id::X25519`], [`Id::ED25519`], [`Id::X448`] or [`Id::ED448`].
-     #[corresponds(EVP_PKEY_get_raw_public_key)]
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn raw_public_key(&self) -> Result<Vec<u8>, ErrorStack> {
-         unsafe {
-             let mut len = 0;
-@@ -303,7 +303,7 @@ where
-     /// This function only works for algorithms that support raw private keys.
-     /// Currently this is: [`Id::HMAC`], [`Id::X25519`], [`Id::ED25519`], [`Id::X448`] or [`Id::ED448`].
-     #[corresponds(EVP_PKEY_get_raw_private_key)]
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn raw_private_key(&self) -> Result<Vec<u8>, ErrorStack> {
-         unsafe {
-             let mut len = 0;
-@@ -484,7 +484,7 @@ impl PKey<Private> {
-         ctx.keygen()
-     }
- 
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     fn generate_eddsa(id: Id) -> Result<PKey<Private>, ErrorStack> {
-         let mut ctx = PkeyCtx::new_id(id)?;
-         ctx.keygen_init()?;
-@@ -514,7 +514,7 @@ impl PKey<Private> {
-     /// assert_eq!(secret.len(), 32);
-     /// # Ok(()) }
-     /// ```
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn generate_x25519() -> Result<PKey<Private>, ErrorStack> {
-         PKey::generate_eddsa(Id::X25519)
-     }
-@@ -568,7 +568,7 @@ impl PKey<Private> {
-     /// assert_eq!(signature.len(), 64);
-     /// # Ok(()) }
-     /// ```
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn generate_ed25519() -> Result<PKey<Private>, ErrorStack> {
-         PKey::generate_eddsa(Id::ED25519)
-     }
-@@ -718,7 +718,7 @@ impl PKey<Private> {
-     ///
-     /// Algorithm types that support raw private keys are HMAC, X25519, ED25519, X448 or ED448
-     #[corresponds(EVP_PKEY_new_raw_private_key)]
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn private_key_from_raw_bytes(
-         bytes: &[u8],
-         key_type: Id,
-@@ -759,7 +759,7 @@ impl PKey<Public> {
-     ///
-     /// Algorithm types that support raw public keys are X25519, ED25519, X448 or ED448
-     #[corresponds(EVP_PKEY_new_raw_public_key)]
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn public_key_from_raw_bytes(
-         bytes: &[u8],
-         key_type: Id,
-diff --git a/openssl/src/pkey_ctx.rs b/openssl/src/pkey_ctx.rs
-index f79372fb..3d4203fa 100644
---- a/openssl/src/pkey_ctx.rs
-+++ b/openssl/src/pkey_ctx.rs
-@@ -470,7 +470,7 @@ impl<T> PkeyCtxRef<T> {
-     ///
-     /// Requires OpenSSL 1.1.0 or newer.
-     #[corresponds(EVP_PKEY_CTX_set_hkdf_md)]
--    #[cfg(ossl110)]
-+    #[cfg(any(ossl110, boringssl))]
-     #[inline]
-     pub fn set_hkdf_md(&mut self, digest: &MdRef) -> Result<(), ErrorStack> {
-         unsafe {
-@@ -503,10 +503,13 @@ impl<T> PkeyCtxRef<T> {
-     ///
-     /// Requires OpenSSL 1.1.0 or newer.
-     #[corresponds(EVP_PKEY_CTX_set1_hkdf_key)]
--    #[cfg(ossl110)]
-+    #[cfg(any(ossl110, boringssl))]
-     #[inline]
-     pub fn set_hkdf_key(&mut self, key: &[u8]) -> Result<(), ErrorStack> {
-+        #[cfg(not(boringssl))]
-         let len = c_int::try_from(key.len()).unwrap();
-+        #[cfg(boringssl)]
-+        let len = key.len();
- 
-         unsafe {
-             cvt(ffi::EVP_PKEY_CTX_set1_hkdf_key(
-@@ -523,10 +526,13 @@ impl<T> PkeyCtxRef<T> {
-     ///
-     /// Requires OpenSSL 1.1.0 or newer.
-     #[corresponds(EVP_PKEY_CTX_set1_hkdf_salt)]
--    #[cfg(ossl110)]
-+    #[cfg(any(ossl110, boringssl))]
-     #[inline]
-     pub fn set_hkdf_salt(&mut self, salt: &[u8]) -> Result<(), ErrorStack> {
-+        #[cfg(not(boringssl))]
-         let len = c_int::try_from(salt.len()).unwrap();
-+        #[cfg(boringssl)]
-+        let len = salt.len();
- 
-         unsafe {
-             cvt(ffi::EVP_PKEY_CTX_set1_hkdf_salt(
-@@ -543,10 +549,13 @@ impl<T> PkeyCtxRef<T> {
-     ///
-     /// Requires OpenSSL 1.1.0 or newer.
-     #[corresponds(EVP_PKEY_CTX_add1_hkdf_info)]
--    #[cfg(ossl110)]
-+    #[cfg(any(ossl110, boringssl))]
-     #[inline]
-     pub fn add_hkdf_info(&mut self, info: &[u8]) -> Result<(), ErrorStack> {
-+        #[cfg(not(boringssl))]
-         let len = c_int::try_from(info.len()).unwrap();
-+        #[cfg(boringssl)]
-+        let len = info.len();
- 
-         unsafe {
-             cvt(ffi::EVP_PKEY_CTX_add1_hkdf_info(
-@@ -604,7 +613,7 @@ mod test {
-     #[cfg(not(boringssl))]
-     use crate::cipher::Cipher;
-     use crate::ec::{EcGroup, EcKey};
--    #[cfg(any(ossl102, libressl310))]
-+    #[cfg(any(ossl102, libressl310, boringssl))]
-     use crate::md::Md;
-     use crate::nid::Nid;
-     use crate::pkey::PKey;
-@@ -689,7 +698,7 @@ mod test {
-     }
- 
-     #[test]
--    #[cfg(ossl110)]
-+    #[cfg(any(ossl110, boringssl))]
-     fn hkdf() {
-         let mut ctx = PkeyCtx::new_id(Id::HKDF).unwrap();
-         ctx.derive_init().unwrap();
-diff --git a/openssl/src/rsa.rs b/openssl/src/rsa.rs
-index 68cf64b0..f155b12d 100644
---- a/openssl/src/rsa.rs
-+++ b/openssl/src/rsa.rs
-@@ -581,7 +581,7 @@ impl<T> fmt::Debug for Rsa<T> {
- }
- 
- cfg_if! {
--    if #[cfg(any(ossl110, libressl273))] {
-+    if #[cfg(any(ossl110, libressl273, boringssl))] {
-         use ffi::{
-             RSA_get0_key, RSA_get0_factors, RSA_get0_crt_params, RSA_set0_key, RSA_set0_factors,
-             RSA_set0_crt_params,
-diff --git a/openssl/src/sign.rs b/openssl/src/sign.rs
-index b675825e..e5e80608 100644
---- a/openssl/src/sign.rs
-+++ b/openssl/src/sign.rs
-@@ -290,7 +290,7 @@ impl<'a> Signer<'a> {
-         self.len_intern()
-     }
- 
--    #[cfg(not(ossl111))]
-+    #[cfg(not(any(boringssl, ossl111)))]
-     fn len_intern(&self) -> Result<usize, ErrorStack> {
-         unsafe {
-             let mut len = 0;
-@@ -303,7 +303,7 @@ impl<'a> Signer<'a> {
-         }
-     }
- 
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     fn len_intern(&self) -> Result<usize, ErrorStack> {
-         unsafe {
-             let mut len = 0;
-@@ -360,7 +360,7 @@ impl<'a> Signer<'a> {
-     /// OpenSSL documentation at [`EVP_DigestSign`].
-     ///
-     /// [`EVP_DigestSign`]: https://www.openssl.org/docs/man1.1.1/man3/EVP_DigestSign.html
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn sign_oneshot(
-         &mut self,
-         sig_buf: &mut [u8],
-@@ -382,7 +382,7 @@ impl<'a> Signer<'a> {
-     /// Returns the signature.
-     ///
-     /// This is a simple convenience wrapper over `len` and `sign_oneshot`.
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn sign_oneshot_to_vec(&mut self, data_buf: &[u8]) -> Result<Vec<u8>, ErrorStack> {
-         let mut sig_buf = vec![0; self.len()?];
-         let len = self.sign_oneshot(&mut sig_buf, data_buf)?;
-@@ -596,7 +596,7 @@ impl<'a> Verifier<'a> {
-     /// OpenSSL documentation at [`EVP_DigestVerify`].
-     ///
-     /// [`EVP_DigestVerify`]: https://www.openssl.org/docs/man1.1.1/man3/EVP_DigestVerify.html
--    #[cfg(ossl111)]
-+    #[cfg(any(boringssl, ossl111))]
-     pub fn verify_oneshot(&mut self, signature: &[u8], buf: &[u8]) -> Result<bool, ErrorStack> {
-         unsafe {
-             let r = ffi::EVP_DigestVerify(
-diff --git a/openssl/src/symm.rs b/openssl/src/symm.rs
-index c75bbc0c..beff5fc2 100644
---- a/openssl/src/symm.rs
-+++ b/openssl/src/symm.rs
-@@ -119,6 +119,7 @@ impl Cipher {
-         unsafe { Cipher(ffi::EVP_aes_128_cfb1()) }
-     }
- 
-+    #[cfg(not(boringssl))]
-     pub fn aes_128_cfb128() -> Cipher {
-         unsafe { Cipher(ffi::EVP_aes_128_cfb128()) }
-     }
-@@ -164,6 +165,7 @@ impl Cipher {
-         unsafe { Cipher(ffi::EVP_aes_192_cfb1()) }
-     }
- 
-+    #[cfg(not(boringssl))]
-     pub fn aes_192_cfb128() -> Cipher {
-         unsafe { Cipher(ffi::EVP_aes_192_cfb128()) }
-     }
-@@ -214,6 +216,7 @@ impl Cipher {
-         unsafe { Cipher(ffi::EVP_aes_256_cfb1()) }
-     }
- 
-+    #[cfg(not(boringssl))]
-     pub fn aes_256_cfb128() -> Cipher {
-         unsafe { Cipher(ffi::EVP_aes_256_cfb128()) }
-     }
-@@ -242,12 +245,12 @@ impl Cipher {
-         unsafe { Cipher(ffi::EVP_aes_256_ocb()) }
-     }
- 
--    #[cfg(not(osslconf = "OPENSSL_NO_BF"))]
-+    #[cfg(not(any(boringssl, osslconf = "OPENSSL_NO_BF")))]
-     pub fn bf_cbc() -> Cipher {
-         unsafe { Cipher(ffi::EVP_bf_cbc()) }
-     }
- 
--    #[cfg(not(osslconf = "OPENSSL_NO_BF"))]
-+    #[cfg(not(any(boringssl, osslconf = "OPENSSL_NO_BF")))]
-     pub fn bf_ecb() -> Cipher {
-         unsafe { Cipher(ffi::EVP_bf_ecb()) }
-     }
-diff --git a/openssl/src/x509/mod.rs b/openssl/src/x509/mod.rs
-index edd54aa8..a03a8aa6 100644
---- a/openssl/src/x509/mod.rs
-+++ b/openssl/src/x509/mod.rs
-@@ -353,6 +353,19 @@ impl X509Builder {
-         unsafe { cvt(ffi::X509_sign(self.0.as_ptr(), key.as_ptr(), hash.as_ptr())).map(|_| ()) }
-     }
- 
-+    /// Signs the certificate with a private key but without a digest.
-+    ///
-+    /// This is the only way to sign with Ed25519 keys as BoringSSL doesn't support the null
-+    /// message digest.
-+    #[cfg(boringssl)]
-+    #[corresponds(X509_sign)]
-+    pub fn sign_without_digest<T>(&mut self, key: &PKeyRef<T>) -> Result<(), ErrorStack>
-+    where
-+        T: HasPrivate,
-+    {
-+        unsafe { cvt(ffi::X509_sign(self.0.as_ptr(), key.as_ptr(), ptr::null())).map(|_| ()) }
-+    }
-+
-     /// Consumes the builder, returning the certificate.
-     pub fn build(self) -> X509 {
-         self.0
-@@ -880,13 +893,13 @@ impl X509NameBuilder {
-     pub fn append_entry_by_text(&mut self, field: &str, value: &str) -> Result<(), ErrorStack> {
-         unsafe {
-             let field = CString::new(field).unwrap();
--            assert!(value.len() <= c_int::max_value() as usize);
-+            assert!(value.len() <= isize::max_value() as usize);
-             cvt(ffi::X509_NAME_add_entry_by_txt(
-                 self.0.as_ptr(),
-                 field.as_ptr() as *mut _,
-                 ffi::MBSTRING_UTF8,
-                 value.as_ptr(),
--                value.len() as c_int,
-+                value.len() as isize,
-                 -1,
-                 0,
-             ))
-@@ -907,13 +920,13 @@ impl X509NameBuilder {
-     ) -> Result<(), ErrorStack> {
-         unsafe {
-             let field = CString::new(field).unwrap();
--            assert!(value.len() <= c_int::max_value() as usize);
-+            assert!(value.len() <= isize::max_value() as usize);
-             cvt(ffi::X509_NAME_add_entry_by_txt(
-                 self.0.as_ptr(),
-                 field.as_ptr() as *mut _,
-                 ty.as_raw(),
-                 value.as_ptr(),
--                value.len() as c_int,
-+                value.len() as isize,
-                 -1,
-                 0,
-             ))
-@@ -928,13 +941,13 @@ impl X509NameBuilder {
-     /// [`X509_NAME_add_entry_by_NID`]: https://www.openssl.org/docs/man1.1.0/crypto/X509_NAME_add_entry_by_NID.html
-     pub fn append_entry_by_nid(&mut self, field: Nid, value: &str) -> Result<(), ErrorStack> {
-         unsafe {
--            assert!(value.len() <= c_int::max_value() as usize);
-+            assert!(value.len() <= isize::max_value() as usize);
-             cvt(ffi::X509_NAME_add_entry_by_NID(
-                 self.0.as_ptr(),
-                 field.as_raw(),
-                 ffi::MBSTRING_UTF8,
-                 value.as_ptr() as *mut _,
--                value.len() as c_int,
-+                value.len() as isize,
-                 -1,
-                 0,
-             ))
-@@ -954,13 +967,13 @@ impl X509NameBuilder {
-         ty: Asn1Type,
-     ) -> Result<(), ErrorStack> {
-         unsafe {
--            assert!(value.len() <= c_int::max_value() as usize);
-+            assert!(value.len() <= isize::max_value() as usize);
-             cvt(ffi::X509_NAME_add_entry_by_NID(
-                 self.0.as_ptr(),
-                 field.as_raw(),
-                 ty.as_raw(),
-                 value.as_ptr() as *mut _,
--                value.len() as c_int,
-+                value.len() as isize,
-                 -1,
-                 0,
-             ))
-@@ -1260,6 +1273,29 @@ impl X509ReqBuilder {
-         }
-     }
- 
-+    /// Sign the request using a private key without a digest.
-+    ///
-+    /// This is the only way to sign with Ed25519 keys as BoringSSL doesn't support the null
-+    /// message digest.
-+    ///
-+    /// This corresponds to [`X509_REQ_sign`].
-+    ///
-+    /// [`X509_REQ_sign`]: https://www.openssl.org/docs/man1.1.0/crypto/X509_REQ_sign.html
-+    #[cfg(boringssl)]
-+    pub fn sign_without_digest<T>(&mut self, key: &PKeyRef<T>) -> Result<(), ErrorStack>
-+    where
-+        T: HasPrivate,
-+    {
-+        unsafe {
-+            cvt(ffi::X509_REQ_sign(
-+                self.0.as_ptr(),
-+                key.as_ptr(),
-+                ptr::null(),
-+            ))
-+            .map(|_| ())
-+        }
-+    }
-+
-     /// Returns the `X509Req`.
-     pub fn build(self) -> X509Req {
-         self.0
--- 
-2.42.0.rc2.253.gd59a3bf2b4-goog
-

diff --git a/nearby/scripts/openssl-patches/README.md b/nearby/scripts/openssl-patches/README.md
deleted file mode 100644
index ab1fcea..0000000
--- a/nearby/scripts/openssl-patches/README.md
+++ /dev/null

@@ -1,38 +0,0 @@
-This directory contains patch files for `rust-openssl` for it to build successfully with
-`--features=unstable_boringssl`.
-
-After running `prepare-rust-openssl`, the `rust-openssl` git repo is cloned to
-`beto-rust/boringssl-build/rust-openssl/openssl`, and the patches in this directory will be applied.
-
-If you make further changes, or update the "base commit" in `prepare-rust-openssl`, you can
-regenerate the patch files by following these steps:
-
-1. Run `cargo run -- prepare-rust-openssl`
-2. `cd boringssl-build/rust-openssl/` and make the necessary changes
-3. Commit the changes
-4. `git format-patch BASE_COMMIT`. (Note: `BASE_COMMIT` is set by `prepare-rust-openssl`)
-5. The patch files will be generated in the current working directory. Move them here in
-   `nearby/scripts/openssl-patches`.
-
-### Regenerate patches based on AOSP changes
-
-In the "make the necessary changes" part in Step 2 above, follow these steps:
-
-1. Download the patch files in https://googleplex-android.googlesource.com/platform/external/rust/crates/openssl/+/master/patches
-2. `cd` into the openssl directory since the AOSP project starts at that root:
-   ```sh
-   $ cd openssl
-   ```
-3. Reset your branch to `BASE_COMMIT` to ensure the AOSP patches apply cleanly.
-   ```sh
-   $ git co BASE_COMMIT
-   $ git co -b create-patch
-   ```
-4. Apply the patches from AOSP
-   ```sh
-   for i in /path/to/android/external/rust/crates/openssl/patches/*; do patch -p1 < $i; done
-   ```
-5. Remove unneeded files (like `.orig`). Commit the changes.
-6. Patches locally in `scripts/openssl-patches` but not in AOSP are lost in this process. Reapply
-   the appropriate ones at this point, using `git apply` or `git am`.
-7. Continue with `git format-patch` described in step 4 in the previous section.

diff --git a/nearby/src/crypto_ffi.rs b/nearby/src/crypto_ffi.rs
index 20d1d5d..42ac5ab 100644
--- a/nearby/src/crypto_ffi.rs
+++ b/nearby/src/crypto_ffi.rs

@@ -14,18 +14,13 @@
 
 use anyhow::anyhow;
 use cmd_runner::{run_cmd_shell, run_cmd_shell_with_color, YellowStderr};
-use owo_colors::OwoColorize as _;
 use semver::{Version, VersionReq};
-use std::{
-    env, fs,
-    path::{Path, PathBuf},
-};
+use std::{env, fs, path::Path};
 
 use crate::CargoOptions;
 
 pub fn boringssl_check_everything(root: &Path, cargo_options: &CargoOptions) -> anyhow::Result<()> {
     check_boringssl(root, cargo_options)?;
-    check_openssl(root, cargo_options)?;
     Ok(())
 }
 
@@ -90,83 +85,6 @@
     Ok(())
 }
 
-pub fn prepare_patched_rust_openssl(root: &Path) -> anyhow::Result<()> {
-    let mut vendor_dir =
-        root.parent().ok_or_else(|| anyhow!("project root dir no parent dir"))?.to_path_buf();
-    vendor_dir.push("boringssl-build");
-    fs::create_dir_all(&vendor_dir)?;
-
-    let repo_dir = clone_repo_if_needed(
-        &vendor_dir,
-        "rust-openssl",
-        "https://github.com/sfackler/rust-openssl.git",
-    )?;
-
-    run_cmd_shell_with_color::<YellowStderr>(
-        &repo_dir,
-        "git checkout 7df56869c5e1e32369091ab106750d644d3aa0c4",
-    )?;
-    run_cmd_shell_with_color::<YellowStderr>(&repo_dir, "git branch -f BASE_COMMIT")?;
-    run_cmd_shell_with_color::<YellowStderr>(
-        &repo_dir,
-        format!(
-            "git am {}/scripts/openssl-patches/*.patch",
-            root.to_str().ok_or_else(|| anyhow!("root dir is not UTF-8"))?
-        ),
-    )?;
-
-    println!("{}", "Preparation complete. The required repositories are downloaded to `beto-rust/boringssl-build`. If
-you need to go back to a clean state, you can remove that directory and rerun this script.
-
-You can now build and test with boringssl using the following command
-  `cargo --config .cargo/config-boringssl.toml test -p crypto_provider* --features=boringssl,std`
-".cyan());
-
-    Ok(())
-}
-
-pub fn check_openssl(root: &Path, cargo_options: &CargoOptions) -> anyhow::Result<()> {
-    log::info!("Checking rust openssl");
-    prepare_patched_rust_openssl(root)?;
-    let locked_arg = if cargo_options.locked { "--locked" } else { "" };
-
-    // test the openssl crate with the boringssl feature
-    run_cmd_shell(
-        root,
-        format!(
-            concat!(
-                "cargo --config .cargo/config-boringssl.toml test {locked_arg} -p crypto_provider_openssl ",
-                "--features=boringssl -- --color=always"
-            ),
-            locked_arg=locked_arg
-        ),
-    )?;
-
-    Ok(())
-}
-
-/// If the repo dir doesn't exist, or errors when running `git fetch -a`, re-clone it.
-///
-/// Returns the repo dir
-fn clone_repo_if_needed(
-    dir: &Path,
-    repo_subdir_name: &str,
-    repo_url: &str,
-) -> anyhow::Result<PathBuf> {
-    let mut repo_dir = dir.to_path_buf();
-    repo_dir.push(repo_subdir_name);
-
-    if run_cmd_shell_with_color::<YellowStderr>(&repo_dir, "git fetch -a").is_err() {
-        // delete it and start over
-        if repo_dir.exists() {
-            fs::remove_dir_all(&repo_dir)?;
-        }
-        run_cmd_shell_with_color::<YellowStderr>(dir, format!("git clone {}", repo_url))?;
-    }
-
-    Ok(repo_dir)
-}
-
 fn get_bindgen_version() -> anyhow::Result<Version> {
     let bindgen_version_output = run_cmd_shell(&env::current_dir().unwrap(), "bindgen --version")?;
 

diff --git a/nearby/src/ffi.rs b/nearby/src/ffi.rs
index 01fe58a..68e6e8c 100644
--- a/nearby/src/ffi.rs
+++ b/nearby/src/ffi.rs

@@ -18,63 +18,15 @@
 
 // wrapper for checking all ffi related things
 pub fn check_everything(root: &path::Path, cargo_options: &CargoOptions) -> anyhow::Result<()> {
-    check_np_ffi_rust(root, cargo_options)?;
-    check_ldt_ffi_rust(root)?;
-    check_ldt_cmake(root, cargo_options)?;
     check_np_ffi_cmake(root, cargo_options)?;
-
-    Ok(())
-}
-
-pub fn check_np_ffi_rust(root: &path::Path, cargo_options: &CargoOptions) -> anyhow::Result<()> {
-    log::info!("Checking np_c_ffi cargo build");
-    let ffi_dir = root.join("presence/np_c_ffi");
-    let locked_arg = if cargo_options.locked { "--locked" } else { "" };
-    for cargo_cmd in [
-        "fmt --check",
-        // Default build, RustCrypto
-        format!("check {locked_arg} --quiet").as_str(),
-        // Build with BoringSSL for crypto
-        format!("check {locked_arg} --no-default-features --features=boringssl").as_str(),
-        "clippy",
-        "deny check",
-        "doc --quiet --no-deps",
-    ] {
-        run_cmd_shell(&ffi_dir, format!("cargo {}", cargo_cmd))?;
-    }
-    Ok(())
-}
-
-pub fn check_ldt_ffi_rust(root: &path::Path) -> anyhow::Result<()> {
-    log::info!("Checking LFT ffi cargo build");
-    let ffi_dir = root.to_path_buf().join("presence/ldt_np_adv_ffi");
-
-    for cargo_cmd in [
-        "fmt --check",
-        // Default build, RustCrypto + no_std
-        "check --quiet",
-        // Turn on std, still using RustCrypto
-        "check --quiet --features=std",
-        // Turn off default features and try to build with std",
-        "check --quiet --no-default-features --features=std",
-        // Turn off RustCrypto and use boringssl
-        "check --quiet --no-default-features --features=boringssl",
-        "doc --quiet --no-deps",
-        "clippy --release",
-        "clippy --features=std",
-        "clippy --no-default-features --features=openssl",
-        "clippy --no-default-features --features=std",
-        "deny check",
-    ] {
-        run_cmd_shell(&ffi_dir, format!("cargo {}", cargo_cmd))?;
-    }
+    check_ldt_cmake(root, cargo_options)?;
 
     Ok(())
 }
 
 pub fn check_np_ffi_cmake(root: &path::Path, cargo_options: &CargoOptions) -> anyhow::Result<()> {
     log::info!("Checking CMake build and tests for np ffi c/c++ code");
-    let build_dir = root.to_path_buf().join("presence/cmake-build");
+    let build_dir = root.join("presence/cmake-build");
     fs::create_dir_all(&build_dir)?;
 
     let locked_arg = if cargo_options.locked { "--locked" } else { "" };
@@ -91,7 +43,7 @@
     run_cmd_shell_with_color::<YellowStderr>(&build_dir, "cmake --build . --target np_ffi_bench")?;
 
     // Run tests with different crypto backends
-    let tests_dir = build_dir.to_path_buf().join("np_cpp_ffi/tests");
+    let tests_dir = build_dir.join("np_cpp_ffi/tests");
     for build_config in [
         // test with default build settings (rustcrypto)
         format!("build {locked_arg} --quiet --release"),
@@ -115,7 +67,7 @@
 
 pub fn check_ldt_cmake(root: &path::Path, cargo_options: &CargoOptions) -> anyhow::Result<()> {
     log::info!("Checking CMake build and tests for ldt c/c++ code");
-    let build_dir = root.to_path_buf().join("presence/cmake-build");
+    let build_dir = root.join("presence/cmake-build");
     fs::create_dir_all(&build_dir)?;
 
     let locked_arg = if cargo_options.locked { "--locked" } else { "" };
@@ -126,8 +78,6 @@
     )?;
 
     // verify sample and benchmarks build
-    let ldt_ffi_crate_dir = root.to_path_buf().join("presence/ldt_np_adv_ffi");
-    run_cmd_shell(&ldt_ffi_crate_dir, format!("cargo build {locked_arg} --release"))?;
     run_cmd_shell_with_color::<YellowStderr>(&build_dir, "cmake --build . --target ldt_c_sample")?;
     run_cmd_shell_with_color::<YellowStderr>(
         &build_dir,
@@ -136,23 +86,18 @@
 
     // 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 ldt_tests_dir = build_dir.to_path_buf().join("ldt_np_c_sample/tests");
+    let ldt_tests_dir = build_dir.join("ldt_np_adv_ffi/c/tests");
     for build_config in [
         // test with default build settings (rustcrypto, no_std)
         format!("build {locked_arg} --quiet --release"),
-        // test with std and default features
-        format!("build {locked_arg} --quiet --features std --release"),
         // test with boringssl crypto feature flag
         format!("build {locked_arg} --quiet --no-default-features --features boringssl --release"),
         // test without defaults and std feature flag
         format!("build {locked_arg} --quiet --no-default-features --features std --release"),
     ] {
-        run_cmd_shell(&ldt_ffi_crate_dir, format!("cargo {}", build_config))?;
+        run_cmd_shell(root, format!("cargo {} -p ldt_np_adv_ffi", build_config))?;
         // Force detection of updated `ldt_np_adv_ffi` static lib
-        let _ = run_cmd_shell_with_color::<YellowStderr>(
-            &build_dir,
-            "rm ldt_np_c_sample/tests/ldt_ffi_tests",
-        );
+        let _ = run_cmd_shell_with_color::<YellowStderr>(&ldt_tests_dir, "rm ldt_ffi_tests");
         run_cmd_shell_with_color::<YellowStderr>(
             &build_dir,
             "cmake --build . --target ldt_ffi_tests",

diff --git a/nearby/src/fuzzers.rs b/nearby/src/fuzzers.rs
index 192d59c..aba01b3 100644
--- a/nearby/src/fuzzers.rs
+++ b/nearby/src/fuzzers.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use cmd_runner::{run_cmd_shell_with_color, YellowStderr};
+use cmd_runner::{run_cmd_shell, run_cmd_shell_with_color, YellowStderr};
 use std::{fs, path};
 
 pub(crate) fn run_rust_fuzzers(root: &path::Path) -> anyhow::Result<()> {
@@ -52,7 +52,7 @@
     run_cmd_shell_with_color::<YellowStderr>(
         &root.join("crypto/crypto_provider_test"),
         concat!(
-            "cargo +nightly fuzz run fuzz_p256 --features=openssl --no-default-features ",
+            "cargo +nightly fuzz run fuzz_p256 --features=boringssl --no-default-features ",
             "-- -runs=10000 -max_total_time=60"
         ),
     )?;
@@ -60,22 +60,25 @@
     Ok(())
 }
 
-pub(crate) fn build_ffi_fuzzers(root: &path::Path) -> anyhow::Result<()> {
-    log::info!("Building ffi fuzzers");
-    // TODO currently broken because the FFI stuff hasn't necessarily been built yet
-    let mut build_dir = root.to_path_buf();
-    build_dir.push("presence/ldt_np_adv_ffi_fuzz/cmake-build");
+// Runs the fuzztest fuzzers as short lived unit tests, compatible with gtest
+pub(crate) fn build_fuzztest_uts(root: &path::Path) -> anyhow::Result<()> {
+    log::info!("Checking fuzztest targets in unit test mode");
 
-    if build_dir.exists() {
-        fs::remove_dir_all(&build_dir)?;
-    }
+    // first build the rust static libs to link against
+    let np_ffi_crate_dir = root.join("presence/np_c_ffi");
+    run_cmd_shell(&np_ffi_crate_dir, "cargo build --release")?;
+    let build_dir = root.join("presence/cmake-build");
     fs::create_dir_all(&build_dir)?;
-    run_cmd_shell_with_color::<YellowStderr>(
-        &build_dir,
-        "cmake -G Ninja ../.. -DENABLE_FUZZ=true",
-    )?;
-    run_cmd_shell_with_color::<YellowStderr>(&build_dir, "cmake --build .")?;
-    fs::remove_dir_all(&build_dir)?;
+    run_cmd_shell_with_color::<YellowStderr>(&build_dir, "cmake -G Ninja -DENABLE_FUZZ=true ..")?;
 
+    for target in ["deserialization_fuzzer", "ldt_fuzzer"] {
+        run_cmd_shell_with_color::<YellowStderr>(
+            &build_dir,
+            format!("cmake --build . --target {}", target),
+        )?;
+    }
+
+    run_cmd_shell_with_color::<YellowStderr>(&build_dir.join("np_cpp_ffi/fuzz/"), "ctest")?;
+    run_cmd_shell_with_color::<YellowStderr>(&build_dir.join("ldt_np_adv_ffi/c/fuzz/"), "ctest")?;
     Ok(())
 }

diff --git a/nearby/src/jni.rs b/nearby/src/jni.rs
index 22a1da2..0b000fb 100644
--- a/nearby/src/jni.rs
+++ b/nearby/src/jni.rs

@@ -17,9 +17,7 @@
 
 // This has to happen after both boringssl has been built and prepare rust openssl patches has been run.
 pub fn check_ldt_jni(root: &path::Path) -> anyhow::Result<()> {
-    for feature in ["opensslbssl", "boringssl"] {
-        run_cmd_shell(root, format!("cargo --config .cargo/config-boringssl.toml build -p ldt_np_jni --no-default-features --features={}", feature))?;
-    }
+    run_cmd_shell(root, "cargo build -p ldt_np_jni --no-default-features --features=boringssl")?;
     Ok(())
 }
 
@@ -28,3 +26,10 @@
     run_cmd_shell(&kotlin_lib_path, "./gradlew :test")?;
     Ok(())
 }
+
+pub fn run_ukey2_jni_tests(root: &path::Path) -> anyhow::Result<()> {
+    run_cmd_shell(root, "cargo build -p ukey2_jni")?;
+    let ukey2_jni_path = root.to_path_buf().join("connections/ukey2/ukey2_jni/java");
+    run_cmd_shell(&ukey2_jni_path, "./gradlew :test")?;
+    Ok(())
+}

diff --git a/nearby/src/main.rs b/nearby/src/main.rs
index 3d698e2..f4843be 100644
--- a/nearby/src/main.rs
+++ b/nearby/src/main.rs

@@ -15,9 +15,9 @@
 extern crate core;
 
 use clap::Parser as _;
-use cmd_runner::run_cmd_shell;
+use cmd_runner::{run_cmd, run_cmd_shell, YellowStderr};
 use env_logger::Env;
-use std::{env, path};
+use std::{env, ffi::OsString, path};
 
 mod crypto_ffi;
 mod ffi;
@@ -46,16 +46,13 @@
         }
         Subcommand::BuildBoringssl => crypto_ffi::build_boringssl(&root_dir)?,
         Subcommand::CheckBoringssl(ref options) => crypto_ffi::check_boringssl(&root_dir, options)?,
-        Subcommand::PrepareRustOpenssl => crypto_ffi::prepare_patched_rust_openssl(&root_dir)?,
-        Subcommand::CheckOpenssl(ref options) => crypto_ffi::check_openssl(&root_dir, options)?,
         Subcommand::RunRustFuzzers => fuzzers::run_rust_fuzzers(&root_dir)?,
-        Subcommand::BuildFfiFuzzers => fuzzers::build_ffi_fuzzers(&root_dir)?,
+        Subcommand::CheckFuzztest => fuzzers::build_fuzztest_uts(&root_dir)?,
         Subcommand::CheckLicenseHeaders => license::check_license_headers(&root_dir)?,
         Subcommand::AddLicenseHeaders => license::add_license_headers(&root_dir)?,
-        Subcommand::CheckLdtFfi => ffi::check_ldt_ffi_rust(&root_dir)?,
         Subcommand::CheckUkey2Ffi(ref options) => ukey2::check_ukey2_ffi(&root_dir, options)?,
+        Subcommand::RunUkey2JniTests => jni::run_ukey2_jni_tests(&root_dir)?,
         Subcommand::CheckLdtJni => jni::check_ldt_jni(&root_dir)?,
-        Subcommand::CheckNpFfi(ref options) => ffi::check_np_ffi_rust(&root_dir, options)?,
         Subcommand::CheckLdtCmake(ref options) => ffi::check_ldt_cmake(&root_dir, options)?,
         Subcommand::CheckNpFfiCmake(ref options) => ffi::check_np_ffi_cmake(&root_dir, options)?,
         Subcommand::RunKotlinTests => jni::run_kotlin_tests(&root_dir)?,
@@ -64,28 +61,68 @@
     Ok(())
 }
 
+fn check_format(root: &path::Path, options: &CheckOptions) -> anyhow::Result<()> {
+    // Rust format
+    {
+        let fmt_command = if options.reformat { "cargo fmt" } else { "cargo fmt --check" };
+        run_cmd_shell(root, fmt_command)?;
+    }
+
+    // Java format. This uses the jar downloaded as part of the CI script or the local
+    // `google-java-format` executable. The jar file path can be overridden with the
+    // `GOOGLE_JAVA_FORMAT_ALL_DEPS_JAR` environment variable. See
+    // <go/google-java-format#installation> for setup instructions for your dev environment if
+    // needed.
+    {
+        let jar_path = std::env::var("GOOGLE_JAVA_FORMAT_ALL_DEPS_JAR").unwrap_or_else(|_| {
+            "/opt/google-java-format/google-java-format-all-deps.jar".to_owned()
+        });
+
+        let mut fmt_command: Vec<OsString> = Vec::new();
+
+        if path::PathBuf::from(&jar_path).exists() {
+            fmt_command.extend(["java".into(), "-jar".into(), jar_path.into()]);
+        } else {
+            fmt_command.push("google-java-format".into());
+        }
+
+        if options.reformat {
+            fmt_command.push("-i".into());
+        } else {
+            fmt_command.extend(["--set-exit-if-changed".into(), "--dry-run".into()]);
+        }
+
+        let java_files: Vec<_> =
+            glob::glob("./**/*.java").unwrap().filter_map(Result::ok).collect();
+
+        for file_set in java_files.chunks(100) {
+            let mut args = fmt_command[1..].to_vec();
+            args.extend(file_set.iter().map(OsString::from));
+
+            run_cmd::<YellowStderr, _, _, _>(root, &fmt_command[0], args)?;
+        }
+    }
+
+    Ok(())
+}
+
 pub fn check_workspace(root: &path::Path, options: &CheckOptions) -> anyhow::Result<()> {
     log::info!("Running cargo checks on workspace");
 
-    let fmt_command = if options.reformat { "cargo fmt" } else { "cargo fmt --check" };
+    // ensure formatting is correct (Check for it first because it is fast compared to running tests)
+    check_format(root, options)?;
 
     for cargo_cmd in [
-        // ensure formatting is correct (Check for it first because it is fast compared to running tests)
-        fmt_command,
         // make sure everything compiles
         "cargo check --workspace --all-targets --quiet",
         // run all the tests
-        //TODO: re-enable the openssl tests, this was potentially failing due to UB code in the
-        // upstream rust-openssl crate's handling of empty slices. This repros consistently when
-        // using the rust-openssl crate backed by openssl-sys on Ubuntu 20.04.
-        "cargo test --workspace --quiet --exclude crypto_provider_openssl -- --color=always",
+        "cargo test --workspace --quiet -- --color=always",
         // Test ukey2 builds with different crypto providers
         "cargo test -p ukey2_connections -p ukey2_rs --no-default-features --features test_rustcrypto",
-        "cargo test -p ukey2_connections -p ukey2_rs --no-default-features --features test_openssl",
         // ensure the docs are valid (cross-references to other code, etc)
         concat!(
-            "RUSTDOCFLAGS='--deny warnings -Z unstable-options --enable-index-page --generate-link-to-definition' ",
-            "cargo +nightly doc --quiet --workspace --no-deps --document-private-items ",
+            "RUSTDOCFLAGS='--deny warnings' ",
+            "cargo doc --quiet --workspace --no-deps --document-private-items ",
             "--target-dir target/dist_docs",
         ),
         "cargo clippy --all-targets --workspace -- --deny warnings",
@@ -102,20 +139,19 @@
     license::check_license_headers(root)?;
     check_workspace(root, check_options)?;
     crypto_ffi::check_boringssl(root, &check_options.cargo_options)?;
-    crypto_ffi::check_openssl(root, &check_options.cargo_options)?;
     ffi::check_everything(root, &check_options.cargo_options)?;
     jni::check_ldt_jni(root)?;
     jni::run_kotlin_tests(root)?;
+    jni::run_ukey2_jni_tests(root)?;
     ukey2::check_ukey2_ffi(root, &check_options.cargo_options)?;
     fuzzers::run_rust_fuzzers(root)?;
-    fuzzers::build_ffi_fuzzers(root)?;
+    fuzzers::build_fuzztest_uts(root)?;
 
     Ok(())
 }
 
 pub fn clean_everything(root: &path::Path) -> anyhow::Result<()> {
     run_cmd_shell(root, "cargo clean")?;
-    run_cmd_shell(&root.join("presence/ldt_np_adv_ffi"), "cargo clean")?;
     run_cmd_shell(&root.join("presence/np_c_ffi"), "cargo clean")?;
     run_cmd_shell(&root.join("crypto/crypto_provider_boringssl"), "cargo clean")?;
     run_cmd_shell(&root.join("connections/ukey2/ukey2_c_ffi"), "cargo clean")?;
@@ -140,29 +176,19 @@
     CleanEverything,
     /// Checks everything included in the top level workspace
     CheckWorkspace(CheckOptions),
-    /// Checks everything related to the boringssl version (equivalent of running check-boringssl
-    /// + check-openssl)
+    /// Checks everything related to the boringssl version
     BoringsslCheckEverything(CargoOptions),
     /// Clones boringssl and uses bindgen to generate the rust crate
     BuildBoringssl,
     /// Run crypto provider tests using boringssl backend
     CheckBoringssl(CargoOptions),
-    /// Applies AOSP specific patches to the 3p `openssl` crate so that it can use a boringssl
-    /// backend
-    PrepareRustOpenssl,
-    /// Run crypto provider tests using openssl crate with boringssl backend
-    CheckOpenssl(CargoOptions),
     /// Build and run pure Rust fuzzers for 10000 runs
     RunRustFuzzers,
-    /// Build FFI fuzzers
-    BuildFfiFuzzers,
+    /// Builds and runs fuzztest property based unit tests
+    CheckFuzztest,
     /// Builds and runs tests for all C/C++ projects. This is a combination of CheckNpFfi,
     /// CheckLdtFfi, and CheckCmakeBuildAndTests
     FfiCheckEverything(CargoOptions),
-    /// Builds the crate checks the cbindgen generation of C/C++ bindings
-    CheckNpFfi(CargoOptions),
-    /// 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
     CheckLdtCmake(CargoOptions),
     /// Checks the CMake build and runs all of the C/C++ tests
@@ -173,10 +199,12 @@
     AddLicenseHeaders,
     /// Builds and runs tests for the UKEY2 FFI
     CheckUkey2Ffi(CargoOptions),
-    /// Checks the build of ldt_jni wrapper with non default features, ie rust-openssl, and boringssl
+    /// Checks the build of ldt_jni wrapper with non default features, ie boringssl
     CheckLdtJni,
     /// Runs the kotlin tests of the LDT Jni API
     RunKotlinTests,
+    /// Checks the build of the ukey2_jni wrapper and runs tests
+    RunUkey2JniTests,
 }
 
 #[derive(clap::Args, Debug, Clone, Default)]

diff --git a/nearby/src/ukey2.rs b/nearby/src/ukey2.rs
index e548ab0..5e711a1 100644
--- a/nearby/src/ukey2.rs
+++ b/nearby/src/ukey2.rs

@@ -28,22 +28,18 @@
 
     // Default build, RustCrypto
     run_cmd_shell(&ffi_dir, format!("cargo build {locked_arg} --quiet --release --lib"))?;
-    // OpenSSL
+    // BoringSSL
     run_cmd_shell(
         &ffi_dir,
-        format!("cargo build {locked_arg} --quiet --no-default-features --features=openssl"),
+        format!("cargo build {locked_arg} --quiet --no-default-features --features=boringssl"),
     )?;
+    run_cmd_shell(&ffi_dir, "cargo clippy --no-default-features --features=boringssl")?;
 
-    run_cmd_shell(&ffi_dir, "cargo doc --quiet --no-deps")?;
-    run_cmd_shell(&ffi_dir, "cargo clippy --no-default-features --features=openssl")?;
-
-    run_cmd_shell(&ffi_dir, "cargo deny check")?;
-
+    // now run cmake build
     let ffi_build_dir = ffi_dir.join("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, "cmake --build .")?;
     run_cmd_shell_with_color::<YellowStderr>(&ffi_build_dir, "ctest")?;
-
     Ok(())
 }

diff --git a/nearby/util/handle_map/src/declare_handle_map.rs b/nearby/util/handle_map/src/declare_handle_map.rs
index c19a012..688ec18 100644
--- a/nearby/util/handle_map/src/declare_handle_map.rs
+++ b/nearby/util/handle_map/src/declare_handle_map.rs

@@ -16,17 +16,18 @@
 
 #[macro_export]
 /// ```ignore
-/// declare_handle_map! {
-///     mod $handle_module_name {
-///         #[dimensions = $map_dimension_provider]
-///         type $handle_type_name: HandleLike<Object = $wrapped_type>;
-///     }
-/// }
+/// declare_handle_map! (
+///     $handle_module_name,
+///     $map_dimension_provider,
+///     $handle_type_name,
+///     $wrapped_type,
+/// )
 /// ```
 ///
-/// 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`.
+/// Declares a new public module with name `handle_module_name` which implements handle functionality
+/// for the given struct `handle_type_name` which is `#[repr(C)]` and represents FFI-accessible
+/// handles to values of type `wrapped_type`. `handle_type_name` expects a struct with a single u64
+/// field `handle_id`.
 ///
 /// 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
@@ -54,14 +55,16 @@
 ///     }
 ///  }
 ///
-///  declare_handle_map! {
-///     mod string_handle {
-///         #[dimensions = super::get_string_handle_map_dimensions()]
-///         type StringHandle: HandleLike<Object = String>;
-///     }
+///  struct StringHandle {
+///     handle_id: u64
 ///  }
 ///
-///  use string_handle::StringHandle;
+///  declare_handle_map!(
+///     string_handle,
+///     super::get_string_handle_map_dimensions(),
+///     super::StringHandle,
+///     String
+///  );
 ///
 ///  fn main() {
 ///         // Note: this method could panic if there are
@@ -90,10 +93,10 @@
 /// ```
 macro_rules! declare_handle_map {
     (
-        mod $handle_module_name:ident {
-            #[dimensions = $map_dimension_provider:expr]
-            type $handle_type_name:ident: HandleLike<Object = $wrapped_type:ty>;
-        }
+        $handle_module_name:ident,
+        $map_dimension_provider:expr,
+        $handle_type_name:ty,
+        $wrapped_type:ty
      ) => {
         #[doc = ::core::concat!(
                     "Macro-generated (via `handle_map::declare_handle_map!`) module which",
@@ -102,7 +105,6 @@
                     " which references values of type `", ::core::stringify!($wrapped_type), "`."
                 )]
         pub mod $handle_module_name {
-
             lazy_static! {
                 static ref GLOBAL_HANDLE_MAP: $crate::HandleMap<$wrapped_type> =
                 $crate::HandleMap::with_dimensions($map_dimension_provider);
@@ -112,11 +114,6 @@
                         "A `#[repr(C)]` handle to a value of type `",
                         ::core::stringify!($wrapped_type), "`."
                     )]
-            #[repr(C)]
-            #[derive(Clone, Copy, PartialEq, Eq)]
-            pub struct $handle_type_name {
-                handle_id: u64,
-            }
 
             impl $handle_type_name {
                 /// Cast the given raw Handle to this HandleLike

diff --git a/nearby/util/pourover/Cargo.toml b/nearby/util/pourover/Cargo.toml
new file mode 100644
index 0000000..ce6fefa
--- /dev/null
+++ b/nearby/util/pourover/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "pourover"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+jni.workspace = true
+pourover_macro.workspace = true
+
+[dev-dependencies]
+# Enable JVM creation for `tests/desc_integration.rs`
+jni = { workspace = true, features = ["invocation"] }

diff --git a/nearby/util/pourover/src/conversions.rs b/nearby/util/pourover/src/conversions.rs
new file mode 100644
index 0000000..69a00a2
--- /dev/null
+++ b/nearby/util/pourover/src/conversions.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.
+
+//! Helper traits to convert byte signedness for Java interop
+
+/// A helper trait to bitcast data to its signed representation
+pub trait ToSigned {
+    /// The signed version of this type.
+    type Signed;
+
+    /// Bitcast to signed
+    fn to_signed(self) -> Self::Signed;
+}
+
+impl<'a> ToSigned for &'a [u8] {
+    type Signed = &'a [i8];
+
+    fn to_signed(self) -> Self::Signed {
+        let len = self.len();
+        // Safety:
+        // u8 and i8 have the same layout and the lifetime is maintained
+        unsafe { core::slice::from_raw_parts(self.as_ptr() as *const i8, len) }
+    }
+}
+
+/// A helper trait to bitcast data to its unsigned representation
+pub trait ToUnsigned {
+    /// The unsigned version of this type.
+    type Unsigned;
+
+    /// Bitcast to unsigned
+    fn to_unsigned(self) -> Self::Unsigned;
+}
+
+impl<'a> ToUnsigned for &'a [i8] {
+    type Unsigned = &'a [u8];
+
+    fn to_unsigned(self) -> Self::Unsigned {
+        let len = self.len();
+        // Safety:
+        // u8 and i8 have the same layout and the lifetime is maintained
+        unsafe { core::slice::from_raw_parts(self.as_ptr() as *const u8, len) }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_to_signed() {
+        let input: &[u8] = &[1, 2, 3, 0, 0xff, 0xfe];
+        let expected: &[i8] = &[1, 2, 3, 0, -1, -2];
+
+        assert_eq!(expected, input.to_signed());
+    }
+
+    #[test]
+    fn test_to_unsigned() {
+        let input: &[i8] = &[1, 2, 3, 0, -1, -2];
+        let expected: &[u8] = &[1, 2, 3, 0, 0xff, 0xfe];
+
+        assert_eq!(expected, input.to_unsigned());
+    }
+
+    #[test]
+    fn test_roundtrip_unsigned() {
+        let case: &[u8] = &[1, 2, 3, 0, 0xff, 0xfe];
+        assert_eq!(case, case.to_signed().to_unsigned());
+    }
+
+    #[test]
+    fn test_roundtrip_signed() {
+        let case: &[i8] = &[1, 2, 3, 0, -1, -2];
+        assert_eq!(case, case.to_unsigned().to_signed());
+    }
+}

diff --git a/nearby/util/pourover/src/desc.rs b/nearby/util/pourover/src/desc.rs
new file mode 100644
index 0000000..507d3de
--- /dev/null
+++ b/nearby/util/pourover/src/desc.rs

@@ -0,0 +1,381 @@
+// 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.
+
+//! Cacheable descriptors. These `jni` crate compatible descriptors will cache their value on first
+//! lookup. They are meant to be combined with static variables in order to globally cache their
+//! associated id values.
+//!
+//! ### Example
+//!
+//! ```java
+//! package com.example;
+//!
+//! public class MyClass {
+//!     public int foo;
+//!     public int getBar() { /* ... */ }
+//! }
+//! ```
+//!
+//! ```rust
+//! use pourover::desc::*;
+//!
+//! static MY_CLASS_DESC: ClassDesc = ClassDesc::new("com/example/MyClass");
+//! static MY_CLASS_FOO_FIELD: FieldDesc = MY_CLASS_DESC.field("foo", "I");
+//! static MY_CLASS_GET_BAR_METHOD: MethodDesc = MY_CLASS_DESC.method("getBar", "I()");
+//! ```
+
+use core::convert::AsRef;
+use jni::{
+    descriptors::Desc,
+    objects::{GlobalRef, JClass, JFieldID, JMethodID, JObject, JStaticFieldID, JStaticMethodID},
+    JNIEnv,
+};
+use std::sync::{LockResult, RwLock, RwLockReadGuard};
+
+/// JNI descriptor that caches a Java class.
+pub struct ClassDesc {
+    /// The JNI descriptor for this class.
+    descriptor: &'static str,
+    /// The cached class
+    ///
+    /// The implementation assumes that `None` is only written to the lock when `&mut self` is
+    /// held. Only `Some` is valid to write to this lock while `&self` is held.
+    cls: RwLock<Option<GlobalRef>>,
+}
+
+impl ClassDesc {
+    /// Create a new descriptor with the given JNI descriptor string.
+    pub const fn new(descriptor: &'static str) -> Self {
+        Self { descriptor, cls: RwLock::new(None) }
+    }
+
+    /// Create a new descriptor for a field member of this class.
+    pub const fn field<'cls>(&'cls self, name: &'static str, sig: &'static str) -> FieldDesc<'cls> {
+        FieldDesc::new(self, name, sig)
+    }
+
+    /// Create a new descriptor for a static field member of this class.
+    pub const fn static_field<'cls>(
+        &'cls self,
+        name: &'static str,
+        sig: &'static str,
+    ) -> StaticFieldDesc<'cls> {
+        StaticFieldDesc::new(self, name, sig)
+    }
+
+    /// Create a new descriptor for a method member of this class.
+    pub const fn method<'cls>(
+        &'cls self,
+        name: &'static str,
+        sig: &'static str,
+    ) -> MethodDesc<'cls> {
+        MethodDesc::new(self, name, sig)
+    }
+
+    /// Create a new descriptor for a constructor for this class.
+    pub const fn constructor<'cls>(&'cls self, sig: &'static str) -> MethodDesc<'cls> {
+        MethodDesc::new(self, "<init>", sig)
+    }
+
+    /// Create a new descriptor for a static method member of this class.
+    pub const fn static_method<'cls>(
+        &'cls self,
+        name: &'static str,
+        sig: &'static str,
+    ) -> StaticMethodDesc<'cls> {
+        StaticMethodDesc::new(self, name, sig)
+    }
+
+    /// Free the cached GlobalRef to the class object. This will happen automatically on drop, but
+    /// this method is provided to allow the value to be dropped early. This can be used to perform
+    /// cleanup on a thread that is already attached to the JVM.
+    pub fn free(&mut self) {
+        // Get a mutable reference ignoring poison state
+        let mut guard = self.cls.write().ignore_poison();
+        let global = guard.take();
+        // Drop the guard before global in case it panics. We don't want to poison the lock.
+        core::mem::drop(guard);
+        // Drop the GlobalRef value to cleanup
+        core::mem::drop(global);
+    }
+
+    fn get_cached(&self) -> Option<CachedClass<'_>> {
+        CachedClass::from_lock(&self.cls)
+    }
+}
+
+/// Wrapper to allow RwLock references to be returned from Desc. Use the `AsRef` impl to get the
+/// associated `JClass` reference. The inner `Option` must always be `Some`. This is enfocred by
+/// the `from_lock` constructor.
+pub struct CachedClass<'lock>(RwLockReadGuard<'lock, Option<GlobalRef>>);
+
+impl<'lock> CachedClass<'lock> {
+    /// Read from the given lock and create a `CachedClass` instance if the lock contains a cached
+    /// class value. The given lock must have valid data even if it is poisoned.
+    fn from_lock(lock: &'lock RwLock<Option<GlobalRef>>) -> Option<CachedClass<'lock>> {
+        let guard = lock.read().ignore_poison();
+
+        // Validate that there is a GlobalRef value already, otherwise avoid constructing `Self`.
+        if guard.is_some() {
+            Some(Self(guard))
+        } else {
+            None
+        }
+    }
+}
+
+// Implement AsRef so that we can use this type as `Desc::Output` in [`ClassDesc`].
+impl<'lock> AsRef<JClass<'static>> for CachedClass<'lock> {
+    fn as_ref(&self) -> &JClass<'static> {
+        // `unwrap` is valid since we checked for `Some` in the constructor.
+        let global = self.0.as_ref().unwrap();
+        // No direct conversion to JClass, so let's go through JObject first.
+        let obj: &JObject<'static> = global.as_ref();
+        // This assumes our object is a class object.
+        let cls: &JClass<'static> = From::from(obj);
+        cls
+    }
+}
+
+/// # Safety
+///
+/// This returns the correct class instance via `JNIEnv::find_class`. The cached class is held in a
+/// [`GlobalRef`] so that it cannot be unloaded.
+unsafe impl<'a, 'local> Desc<'local, JClass<'static>> for &'a ClassDesc {
+    type Output = CachedClass<'a>;
+
+    fn lookup(self, env: &mut JNIEnv<'local>) -> jni::errors::Result<Self::Output> {
+        // Check the cache
+        if let Some(cls) = self.get_cached() {
+            return Ok(cls);
+        }
+
+        {
+            // Ignoring poison is fine because we only write fully-constructed values.
+            let mut guard = self.cls.write().ignore_poison();
+
+            // Multiple threads could have hit this block at the same time. Only allocate the
+            // `GlobalRef` if it was not already allocated.
+            if guard.is_none() {
+                let cls = env.find_class(self.descriptor)?;
+                let global = env.new_global_ref(cls)?;
+
+                // Only directly assign valid values. That way poison state can't have broken
+                // invariants. If the above panicked then it will poison without changing the
+                // lock's data, and everything will still be fine albeit with a sprinkle of
+                // possibly-leaked memory.
+                *guard = Some(global);
+            }
+        }
+
+        // Safe to unwrap since we just set `self.cls` to `Some`. `ClassDesc::free` can't be called
+        // before this point because it takes a mutable reference to `*self`.
+        Ok(self.get_cached().unwrap())
+    }
+}
+
+/// A descriptor for a class member. `Id` is expected to implement the [`MemberId`] trait.
+///
+/// See [`FieldDesc`], [`StaticFieldDesc`], [`MethodDesc`], and [`StaticMethodDesc`] aliases.
+pub struct MemberDesc<'cls, Id> {
+    cls: &'cls ClassDesc,
+    name: &'static str,
+    sig: &'static str,
+    id: RwLock<Option<Id>>,
+}
+
+/// Descriptor for a field.
+pub type FieldDesc<'cls> = MemberDesc<'cls, JFieldID>;
+/// Descriptor for a static field.
+pub type StaticFieldDesc<'cls> = MemberDesc<'cls, JStaticFieldID>;
+/// Descriptor for a method.
+pub type MethodDesc<'cls> = MemberDesc<'cls, JMethodID>;
+/// Descriptor for a static method.
+pub type StaticMethodDesc<'cls> = MemberDesc<'cls, JStaticMethodID>;
+
+impl<'cls, Id: MemberId> MemberDesc<'cls, Id> {
+    /// Create a new descriptor for a member of the given class with the given name and signature.
+    ///
+    /// Please use the helpers on [`ClassDesc`] instead of directly calling this method.
+    pub const fn new(cls: &'cls ClassDesc, name: &'static str, sig: &'static str) -> Self {
+        Self { cls, name, sig, id: RwLock::new(None) }
+    }
+
+    /// Get the class descriptor that this member is associated to.
+    pub const fn cls(&self) -> &'cls ClassDesc {
+        self.cls
+    }
+}
+
+/// # Safety
+///
+/// This returns the correct id. It is the same id obtained from the JNI. This id can be a pointer
+/// in some JVM implementations. See trait [`MemberId`].
+unsafe impl<'cls, 'local, Id: MemberId> Desc<'local, Id> for &MemberDesc<'cls, Id> {
+    type Output = Id;
+
+    fn lookup(self, env: &mut JNIEnv<'local>) -> jni::errors::Result<Self::Output> {
+        // Check the cache.
+        if let Some(id) = *self.id.read().ignore_poison() {
+            return Ok(id);
+        }
+
+        {
+            // Ignoring poison is fine because we only write valid values.
+            let mut guard = self.id.write().ignore_poison();
+
+            // Multiple threads could have hit this block at the same time. Only lookup the id if
+            // the lookup was not already performed.
+            if guard.is_none() {
+                let id = Id::lookup(env, self)?;
+
+                // Only directly assign valid values. That way poison state can't have broken
+                // invariants. If the above panicked then it will poison without changing the
+                // lock's data and everything will still be fine.
+                *guard = Some(id);
+
+                Ok(id)
+            } else {
+                // Can unwrap since we just checked for `None`.
+                Ok(*guard.as_ref().unwrap())
+            }
+        }
+    }
+}
+
+/// Helper trait that calls into `jni` to lookup the id values. This is specialized on the id's
+/// type to call the correct lookup function.
+///
+/// # Safety
+///
+/// Implementers must be an ID returned from the JNI. `lookup` must be implemented such that the
+/// returned ID matches the JNI descriptor given. All values must be sourced from the JNI APIs.
+/// See [`::jni::descriptors::Desc`].
+pub unsafe trait MemberId: Sized + Copy + AsRef<Self> {
+    /// Lookup the id of the given descriptor via the given environment.
+    fn lookup(env: &mut JNIEnv, desc: &MemberDesc<Self>) -> jni::errors::Result<Self>;
+}
+
+/// # Safety
+///
+/// This fetches the matching ID from the JNI APIs.
+unsafe impl MemberId for JFieldID {
+    fn lookup(env: &mut JNIEnv, desc: &MemberDesc<Self>) -> jni::errors::Result<Self> {
+        env.get_field_id(desc.cls(), desc.name, desc.sig)
+    }
+}
+
+/// # Safety
+///
+/// This fetches the matching ID from the JNI APIs.
+unsafe impl MemberId for JStaticFieldID {
+    fn lookup(env: &mut JNIEnv, desc: &MemberDesc<Self>) -> jni::errors::Result<Self> {
+        env.get_static_field_id(desc.cls(), desc.name, desc.sig)
+    }
+}
+
+/// # Safety
+///
+/// This fetches the matching ID from the JNI APIs.
+unsafe impl MemberId for JMethodID {
+    fn lookup(env: &mut JNIEnv, desc: &MemberDesc<Self>) -> jni::errors::Result<Self> {
+        env.get_method_id(desc.cls(), desc.name, desc.sig)
+    }
+}
+
+/// # Safety
+///
+/// This fetches the matching ID from the JNI APIs.
+unsafe impl MemberId for JStaticMethodID {
+    fn lookup(env: &mut JNIEnv, desc: &MemberDesc<Self>) -> jni::errors::Result<Self> {
+        env.get_static_method_id(desc.cls(), desc.name, desc.sig)
+    }
+}
+
+/// Internal helper to ignore the poison state of `LockResult`.
+///
+/// The poison state occurs when a panic occurs during the lock's critical section. This means that
+/// the invariants of the locked data that were protected by the lock may be broken. When this
+/// trait is used below, it is used in scenarios where the locked data does not have invariants
+/// that can be broken in this way. In these cases, the possibly-poisoned lock is being used purely
+/// for synchronization, so the poison state may be ignored.
+trait IgnoreLockPoison {
+    type Guard;
+
+    /// Extract the inner `Guard` of this `LockResult`. This ignores whether the lock state is
+    /// poisoned or not.
+    fn ignore_poison(self) -> Self::Guard;
+}
+
+impl<G> IgnoreLockPoison for LockResult<G> {
+    type Guard = G;
+    fn ignore_poison(self) -> Self::Guard {
+        self.unwrap_or_else(|poison| poison.into_inner())
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const DESC: &str = "com/example/Foo";
+    static FOO: ClassDesc = ClassDesc::new(DESC);
+
+    static FIELD: FieldDesc = FOO.field("foo", "I");
+    static STATIC_FIELD: StaticFieldDesc = FOO.static_field("sfoo", "J");
+    static CONSTRUCTOR: MethodDesc = FOO.constructor("(I)V");
+    static METHOD: MethodDesc = FOO.method("mfoo", "()Z");
+    static STATIC_METHOD: StaticMethodDesc = FOO.static_method("smfoo", "()I");
+
+    #[test]
+    fn class_desc_created_properly() {
+        assert_eq!(DESC, FOO.descriptor);
+        assert!(FOO.cls.read().ignore_poison().is_none());
+    }
+
+    #[test]
+    fn field_desc_created_properly() {
+        assert!(std::ptr::eq(&FOO, FIELD.cls()));
+        assert_eq!("foo", FIELD.name);
+        assert_eq!("I", FIELD.sig);
+    }
+
+    #[test]
+    fn static_field_desc_created_properly() {
+        assert!(std::ptr::eq(&FOO, STATIC_FIELD.cls()));
+        assert_eq!("sfoo", STATIC_FIELD.name);
+        assert_eq!("J", STATIC_FIELD.sig);
+    }
+
+    #[test]
+    fn constructor_desc_created_properly() {
+        assert!(std::ptr::eq(&FOO, CONSTRUCTOR.cls()));
+        assert_eq!("<init>", CONSTRUCTOR.name);
+        assert_eq!("(I)V", CONSTRUCTOR.sig);
+    }
+
+    #[test]
+    fn method_desc_created_properly() {
+        assert!(std::ptr::eq(&FOO, METHOD.cls()));
+        assert_eq!("mfoo", METHOD.name);
+        assert_eq!("()Z", METHOD.sig);
+    }
+
+    #[test]
+    fn static_method_desc_created_properly() {
+        assert!(std::ptr::eq(&FOO, STATIC_METHOD.cls()));
+        assert_eq!("smfoo", STATIC_METHOD.name);
+        assert_eq!("()I", STATIC_METHOD.sig);
+    }
+}

diff --git a/nearby/connections/connections_adv/connections_adv/src/lib.rs b/nearby/util/pourover/src/lib.rs
similarity index 67%
rename from nearby/connections/connections_adv/connections_adv/src/lib.rs
rename to nearby/util/pourover/src/lib.rs
index 4cfcdfa..51495de 100644
--- a/nearby/connections/connections_adv/connections_adv/src/lib.rs
+++ b/nearby/util/pourover/src/lib.rs

@@ -12,20 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! Placeholder crate for connections advertisements
+//! Utilties for JNI interactions.
 
-/// placeholder
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
+// Enforce documentation
+#![deny(missing_docs)]
+#![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(test)]
-mod tests {
-    use super::*;
+pub use pourover_macro::jni_method;
 
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+pub mod desc;
+
+mod conversions;
+pub use conversions::{ToSigned, ToUnsigned};

diff --git a/nearby/util/pourover/tests/Foo.java b/nearby/util/pourover/tests/Foo.java
new file mode 100644
index 0000000..0907964
--- /dev/null
+++ b/nearby/util/pourover/tests/Foo.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2024 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.
+ */
+
+package com.example;
+
+/** Test class for integration tests. See {@code common/foo_class.rs} for how to compile and use. */
+public final class Foo {
+
+  public static long sfoo = 321;
+
+  public int foo;
+
+  public static int smfoo() {
+    return 3;
+  }
+
+  public Foo(int f) {
+    this.foo = f;
+  }
+
+  public boolean mfoo() {
+    return true;
+  }
+
+  public native int nativeReturnsInt(int n);
+
+  public native String nativeReturnsObject(int n);
+}

diff --git a/nearby/util/pourover/tests/common/foo_class.rs b/nearby/util/pourover/tests/common/foo_class.rs
new file mode 100644
index 0000000..65971d7
--- /dev/null
+++ b/nearby/util/pourover/tests/common/foo_class.rs

@@ -0,0 +1,89 @@
+// Copyright 2024 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.
+
+//! Java integration for the `Foo.java` test class.
+//!
+//! There are pourover descriptors for each member of `Foo`. Keep these in sync with changes to
+//! `Foo.java`.
+//!
+//! Compilation is done at runtime. There isn't a way to create a build.rs for an integration test.
+//! use [`compile_foo`] to get the class bytes and load the class using
+//! [`jni::JNIEnv::define_class`].
+
+use pourover::desc::*;
+use std::error::Error;
+use std::process::Command;
+
+pub const CLASS_DESC: &str = "com/example/Foo";
+pub static FOO: ClassDesc = ClassDesc::new(CLASS_DESC);
+
+pub static FIELD: FieldDesc = FOO.field("foo", "I");
+pub static STATIC_FIELD: StaticFieldDesc = FOO.static_field("sfoo", "J");
+pub static CONSTRUCTOR: MethodDesc = FOO.constructor("(I)V");
+pub static METHOD: MethodDesc = FOO.method("mfoo", "()Z");
+pub static STATIC_METHOD: StaticMethodDesc = FOO.static_method("smfoo", "()I");
+pub static NATIVE_METHOD: MethodDesc = FOO.method("nativeReturnsInt", "(I)I");
+pub static NATIVE_OBJECT_METHOD: MethodDesc =
+    FOO.method("nativeReturnsObject", "(I)Ljava/lang/String;");
+
+/// Quick test to ensure that Java is available on the system. The version will be logged to
+/// stdout.
+#[test]
+fn has_java() -> Result<(), Box<dyn Error>> {
+    Command::new("java").arg("--version").status()?;
+    Ok(())
+}
+
+/// Compile `Foo.java` and return the class file's bytes.
+#[track_caller]
+pub fn compile_foo() -> Result<Vec<u8>, Box<dyn Error>> {
+    // Avoid concurrent tests colliding on the file system by adding a hash of the call-site to the
+    // temp file path
+    let caller_hash = {
+        use core::hash::{Hash, Hasher};
+        let caller = core::panic::Location::caller();
+        let mut hasher = std::collections::hash_map::DefaultHasher::new();
+        caller.hash(&mut hasher);
+        hasher.finish()
+    };
+
+    // Create a temporary dir to generate class files
+    let mut tmp = std::env::temp_dir();
+    tmp.push(format!("test-java-build-{caller_hash:016x}"));
+
+    if let Err(err) = std::fs::create_dir(&tmp) {
+        println!("error creating {}: {}", tmp.display(), &err);
+    }
+
+    // Compile Foo.java into the temp dir
+    Command::new("javac")
+        .args(["--release", "8"])
+        .arg("-d")
+        .arg(&tmp)
+        .arg("tests/Foo.java")
+        .status()?;
+
+    // Read the class file bytes
+    let class = {
+        let mut class_file = tmp.clone();
+        class_file.push("com/example/Foo.class");
+        std::fs::read(&class_file)?
+    };
+
+    // Clean up the temp dir. If an error occurs before this we will leave the temp dir on the
+    // filesystem. That should work better for debugging than cleaning up in all cases.
+    std::fs::remove_dir_all(&tmp)?;
+
+    Ok(class)
+}

diff --git a/nearby/connections/connections_adv/connections_adv/src/lib.rs b/nearby/util/pourover/tests/common/mod.rs
similarity index 63%
copy from nearby/connections/connections_adv/connections_adv/src/lib.rs
copy to nearby/util/pourover/tests/common/mod.rs
index 4cfcdfa..1dad720 100644
--- a/nearby/connections/connections_adv/connections_adv/src/lib.rs
+++ b/nearby/util/pourover/tests/common/mod.rs

@@ -1,4 +1,4 @@
-// Copyright 2023 Google LLC
+// Copyright 2024 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,20 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! Placeholder crate for connections advertisements
+//! Common module for pourover integration tests. This file must use the `mod.rs` name to avoid
+//! being compiled as an integration test.
 
-/// placeholder
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
+// Not every item is used in every test
+#![allow(dead_code)]
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+pub mod foo_class;

diff --git a/nearby/util/pourover/tests/desc_integration.rs b/nearby/util/pourover/tests/desc_integration.rs
new file mode 100644
index 0000000..7eec528
--- /dev/null
+++ b/nearby/util/pourover/tests/desc_integration.rs

@@ -0,0 +1,100 @@
+// Copyright 2024 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 jni::{
+    descriptors::Desc,
+    objects::JObject,
+    signature::{JavaType, Primitive, ReturnType},
+    JavaVM,
+};
+use std::error::Error;
+
+mod common;
+use common::foo_class::*;
+
+#[test]
+fn jni_access() -> Result<(), Box<dyn Error>> {
+    // Create the environment
+    let vm = JavaVM::new(
+        jni::InitArgsBuilder::new().version(jni::JNIVersion::V8).option("-Xcheck:jni").build()?,
+    )?;
+    let mut env = vm.attach_current_thread()?;
+
+    // Load `Foo.class`
+    {
+        let foo_class = compile_foo()?;
+        let loaded_foo = env.define_class(CLASS_DESC, &JObject::null(), &foo_class)?;
+        let loaded_foo = env.auto_local(loaded_foo);
+
+        let found_foo = FOO.lookup(&mut env)?;
+        assert!(env.is_same_object(&loaded_foo, found_foo.as_ref())?);
+    }
+
+    // Verify we can call the constructor
+    let obj_foo = {
+        let method_id = CONSTRUCTOR.lookup(&mut env)?;
+        let args = &[jni::sys::jvalue { i: 123 }];
+        // Safety: `args` must match the constructor arg count and types.
+        unsafe { env.new_object_unchecked(CONSTRUCTOR.cls(), method_id, args) }?
+    };
+    assert!(env.is_instance_of(&obj_foo, &FOO)?);
+
+    // Verify we can access all of the members
+
+    let field_value =
+        { env.get_field_unchecked(&obj_foo, &FIELD, ReturnType::Primitive(Primitive::Int))?.i()? };
+    assert_eq!(123, field_value);
+
+    let method_value = {
+        let method_id = METHOD.lookup(&mut env)?;
+        let args = &[];
+        // Safety: `args` must match the method arg count and types.
+        unsafe {
+            env.call_method_unchecked(
+                &obj_foo,
+                method_id,
+                ReturnType::Primitive(Primitive::Boolean),
+                args,
+            )
+        }?
+        .z()?
+    };
+    assert!(method_value);
+
+    env.delete_local_ref(obj_foo)?;
+
+    let static_field_value = {
+        env.get_static_field_unchecked(&FOO, &STATIC_FIELD, JavaType::Primitive(Primitive::Long))?
+            .j()?
+    };
+    assert_eq!(321, static_field_value);
+
+    let static_method_value = {
+        let method_id = STATIC_METHOD.lookup(&mut env)?;
+        let args = &[];
+        // Safety: `args` must match the method arg count and types.
+        unsafe {
+            env.call_static_method_unchecked(
+                &FOO,
+                method_id,
+                ReturnType::Primitive(Primitive::Int),
+                args,
+            )
+        }?
+        .i()?
+    };
+    assert_eq!(3, static_method_value);
+
+    Ok(())
+}

diff --git a/nearby/util/pourover/tests/jni_method_integration.rs b/nearby/util/pourover/tests/jni_method_integration.rs
new file mode 100644
index 0000000..73d89d1
--- /dev/null
+++ b/nearby/util/pourover/tests/jni_method_integration.rs

@@ -0,0 +1,156 @@
+// Copyright 2024 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 jni::{
+    descriptors::Desc,
+    objects::{JObject, JString},
+    signature::{Primitive, ReturnType},
+    sys::jint,
+    JNIEnv, JavaVM,
+};
+use std::error::Error;
+use std::sync::atomic::{AtomicBool, Ordering};
+
+mod common;
+use common::foo_class::*;
+
+static NATIVE_METHOD_CALLED: AtomicBool = AtomicBool::new(false);
+static TEST_PANIC: AtomicBool = AtomicBool::new(false);
+
+#[pourover::jni_method(
+    package = "com.example",
+    class = "Foo",
+    panic_returns = -1
+)]
+extern "system" fn nativeReturnsInt<'local>(
+    mut env: JNIEnv<'local>,
+    this: JObject<'local>,
+    n: jint,
+) -> jint {
+    NATIVE_METHOD_CALLED.store(true, Ordering::SeqCst);
+
+    let foo_value = env
+        .get_field_unchecked(&this, &FIELD, ReturnType::Primitive(Primitive::Int))
+        .unwrap()
+        .i()
+        .unwrap();
+
+    n * foo_value
+}
+
+#[pourover::jni_method(
+    package = "com.example",
+    class = "Foo",
+    panic_returns = JObject::null().into(),
+)]
+extern "system" fn nativeReturnsObject<'local>(
+    env: JNIEnv<'local>,
+    _this: JObject<'local>,
+    n: jint,
+) -> JString<'local> {
+    if TEST_PANIC.load(Ordering::SeqCst) {
+        panic!("testing panic case");
+    }
+    env.new_string(n.to_string()).unwrap()
+}
+
+#[test]
+fn can_call_native_method() -> Result<(), Box<dyn Error>> {
+    // Create the environment
+    let vm = JavaVM::new(
+        jni::InitArgsBuilder::new().version(jni::JNIVersion::V8).option("-Xcheck:jni").build()?,
+    )?;
+    let mut env = vm.attach_current_thread()?;
+
+    {
+        let foo_class = compile_foo()?;
+        let loaded_foo = env.define_class(CLASS_DESC, &JObject::null(), &foo_class)?;
+        env.delete_local_ref(loaded_foo)?;
+    }
+
+    let obj_foo = {
+        let method_id = CONSTRUCTOR.lookup(&mut env)?;
+        let args = &[jni::sys::jvalue { i: 123 }];
+        // Safety: `args` must match the constructor arg count and types.
+        unsafe { env.new_object_unchecked(CONSTRUCTOR.cls(), method_id, args) }?
+    };
+    let obj_foo = env.auto_local(obj_foo);
+
+    NATIVE_METHOD_CALLED.store(false, Ordering::SeqCst);
+
+    // TODO: It would be better if the JVM was able to find the method on its own,
+    // but, since we are using the invocation API to create the JVM, I haven't found a way to make
+    // it visible to the JVM. Normally the methods are loaded dynamically with
+    // `System.loadLibrary`, but in this case the symbols already exist in the executable, and I'm
+    // unsure why the JVM cannot find them. I have tried compiling with
+    // `-Zexport-executable-symbols` but that wasn't working for me.
+    env.register_native_methods(
+        &FOO,
+        &[
+            jni::NativeMethod {
+                name: "nativeReturnsInt".into(),
+                sig: "(I)I".into(),
+                fn_ptr: crate::nativeReturnsInt as *mut std::ffi::c_void,
+            },
+            jni::NativeMethod {
+                name: "nativeReturnsObject".into(),
+                sig: "(I)Ljava/lang/String;".into(),
+                fn_ptr: crate::nativeReturnsObject as *mut std::ffi::c_void,
+            },
+        ],
+    )?;
+
+    let method_value = {
+        let method_id = NATIVE_METHOD.lookup(&mut env)?;
+        let args = &[jni::sys::jvalue { i: 3 }];
+        // Safety: `args` must match the method arg count and types.
+        unsafe {
+            env.call_method_unchecked(
+                &obj_foo,
+                method_id,
+                ReturnType::Primitive(Primitive::Int),
+                args,
+            )
+        }?
+        .i()?
+    };
+
+    assert_eq!(369, method_value);
+    assert!(NATIVE_METHOD_CALLED.load(Ordering::SeqCst));
+
+    TEST_PANIC.store(false, Ordering::SeqCst);
+    let string_value: JString = {
+        let method_id = NATIVE_OBJECT_METHOD.lookup(&mut env)?;
+        let args = &[jni::sys::jvalue { i: 1234 }];
+        // Safety: `args` must match the method arg count and types.
+        unsafe { env.call_method_unchecked(&obj_foo, method_id, ReturnType::Object, args) }?
+            .l()?
+            .into()
+    };
+    assert_eq!("1234", env.get_string(&string_value)?.to_str()?);
+    env.delete_local_ref(string_value)?;
+
+    TEST_PANIC.store(true, Ordering::SeqCst);
+    let string_value: JString = {
+        let method_id = NATIVE_OBJECT_METHOD.lookup(&mut env)?;
+        let args = &[jni::sys::jvalue { i: 1234 }];
+        // Safety: `args` must match the method arg count and types.
+        unsafe { env.call_method_unchecked(&obj_foo, method_id, ReturnType::Object, args) }?
+            .l()?
+            .into()
+    };
+    assert!(string_value.is_null());
+
+    Ok(())
+}

diff --git a/nearby/util/pourover_macro/Cargo.toml b/nearby/util/pourover_macro/Cargo.toml
new file mode 100644
index 0000000..ac230b1
--- /dev/null
+++ b/nearby/util/pourover_macro/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "pourover_macro"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[lib]
+proc-macro = true
+
+[dependencies]
+pourover_macro_core.workspace = true

diff --git a/nearby/util/pourover_macro/src/lib.rs b/nearby/util/pourover_macro/src/lib.rs
new file mode 100644
index 0000000..9f62354
--- /dev/null
+++ b/nearby/util/pourover_macro/src/lib.rs

@@ -0,0 +1,56 @@
+// 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 proc_macro;
+
+use pourover_macro_core as core;
+use proc_macro::TokenStream;
+
+/// Export a function as a JNI native method. This will attach a `#[export_name = "..."]` attribute that
+/// is formatted with the given parameters.
+///
+/// # Parameters
+/// - `package` (lit str): the Java package for the class being implemented
+/// - `class` (lit str): the Java class being implemented. Use `Foo.Inner` syntax for inner
+/// classes.
+/// - `panic_returns` (expr): the value to return when a panic is encountered. This can not access
+/// local variables. This may only be used with `panic=unwind` and will produce a compile error
+/// otherwise.
+///
+/// When using `panic_returns` function arguments must be [`std::panic::UnwindSafe`]. See
+/// [`std::panic::catch_unwind`] for details. In practice this will not cause issues as JNI
+/// arguments and return values are passed by pointer or value and not by Rust reference.
+///
+/// # Example
+/// ```
+/// # use pourover_macro::jni_method;
+/// # #[allow(non_camel_case_types)] type jint = i32; // avoid jni dep for test
+/// # type JNIEnv<'local> = *mut ();
+/// # type JObject<'local> = *mut ();
+///
+/// #[jni_method(package = "my.package", class = "Foo", panic_returns = -1)]
+/// extern "system" fn getFoo<'local>(
+///     mut env: JNIEnv<'local>,
+///     this: JObject<'local>,
+/// ) -> jint {
+///     // ...
+///     0
+/// }
+/// ```
+///
+/// This function will be exported with `#[export_name = "Java_my_package_Foo_getFoo"]`.
+#[proc_macro_attribute]
+pub fn jni_method(meta: TokenStream, item: TokenStream) -> TokenStream {
+    core::jni_method(meta.into(), item.into()).into()
+}

diff --git a/nearby/util/pourover_macro_core/Cargo.toml b/nearby/util/pourover_macro_core/Cargo.toml
new file mode 100644
index 0000000..04882d1
--- /dev/null
+++ b/nearby/util/pourover_macro_core/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "pourover_macro_core"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[dependencies]
+proc-macro2.workspace = true
+syn.workspace = true
+quote.workspace = true

diff --git a/nearby/util/pourover_macro_core/src/jni_method.rs b/nearby/util/pourover_macro_core/src/jni_method.rs
new file mode 100644
index 0000000..73ca155
--- /dev/null
+++ b/nearby/util/pourover_macro_core/src/jni_method.rs

@@ -0,0 +1,346 @@
+// Copyright 2024 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 proc_macro2::TokenStream;
+use quote::ToTokens;
+use syn::{punctuated::Punctuated, spanned::Spanned, ItemFn, LitStr, Token};
+
+mod meta;
+mod meta_arg;
+mod substitutions;
+
+use meta::JniMethodMeta;
+use substitutions::substitute_method_chars;
+
+/// See `pourover_macro::jni_method` for usage.
+pub fn jni_method(meta: TokenStream, item: TokenStream) -> TokenStream {
+    match jni_method_inner(meta, item) {
+        Ok(out) => out.to_token_stream(),
+        Err(err) => err.to_compile_error(),
+    }
+}
+
+fn jni_method_inner(meta: TokenStream, item: TokenStream) -> syn::Result<impl ToTokens> {
+    let meta = syn::parse2::<JniMethodMeta>(meta)?;
+    let mut func = syn::parse2::<ItemFn>(item)?;
+
+    // Check that ABI is set to `extern "system"`
+    if let Some(ref abi @ syn::Abi { name: Some(ref abi_name), .. }) = func.sig.abi {
+        if abi_name.value() != "system" {
+            return Err(syn::Error::new(
+                abi.span(),
+                "JNI methods are required to have the `extern \"system\"` ABI",
+            ));
+        }
+    } else {
+        return Err(syn::Error::new(
+            func.sig.span(),
+            "JNI methods are required to have the `extern \"system\"` ABI",
+        ));
+    }
+
+    let export_attr = {
+        // Format the name of the function as expected by the JNI layer
+        let method_name = func.sig.ident.to_string();
+        if method_name.starts_with("Java_") {
+            return Err(syn::Error::new(
+                func.sig.ident.span(),
+                "The `jni_method` attribute will perform the JNI name formatting",
+            ));
+        }
+        let method_name = substitute_method_chars(&method_name);
+
+        // NOTE: doesn't handle overload suffix
+        let link_name = LitStr::new(
+            &format!("Java_{class}_{method_name}", class = &meta.class_desc),
+            func.sig.ident.span(),
+        );
+
+        syn::parse_quote! { #[export_name = #link_name] }
+    };
+    let allow_attr = syn::parse_quote! { #[allow(non_snake_case)] };
+    func.attrs.extend([export_attr, allow_attr]);
+
+    // Add a panic handler if requested
+    if let Some(panic_returns) = meta.panic_returns {
+        let block = &func.block;
+        let return_type = &func.sig.output;
+        let mut lifetimes = Punctuated::new();
+        for param in func.sig.generics.lifetimes() {
+            lifetimes.push_value(param.clone());
+            lifetimes.push_punct(<Token![,]>::default());
+        }
+
+        let panic_check = quote::quote_spanned! { panic_returns.span() =>
+            #[cfg(not(panic = "unwind"))]
+            ::core::compile_error!("Cannot use `panic_returns` with non-unwinding panic handler");
+        };
+
+        func.block = syn::parse_quote! {
+            {
+                #panic_check
+                match ::std::panic::catch_unwind(move || {
+                    #block
+                }) {
+                    Ok(ret) => ret,
+                    Err(_err) => {
+                        fn __on_panic<#lifetimes>() #return_type { #panic_returns }
+                        __on_panic()
+                    },
+                }
+            }
+        };
+    }
+
+    // Return the modified function
+    Ok(func)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use proc_macro2::{TokenStream, TokenTree};
+    use quote::quote;
+
+    fn contains_ident(stream: TokenStream, ident: &str) -> bool {
+        /// Iterator that traverses TokenTree:Group structures in preorder.
+        struct FlatStream {
+            streams: Vec<<TokenStream as IntoIterator>::IntoIter>,
+        }
+
+        impl FlatStream {
+            fn new(stream: TokenStream) -> Self {
+                Self { streams: vec![stream.into_iter()] }
+            }
+        }
+
+        impl Iterator for FlatStream {
+            type Item = TokenTree;
+
+            fn next(&mut self) -> Option<TokenTree> {
+                let next = loop {
+                    let stream = self.streams.last_mut()?;
+                    if let Some(next) = stream.next() {
+                        break next;
+                    }
+                    self.streams.pop();
+                };
+
+                if let TokenTree::Group(group) = &next {
+                    self.streams.push(group.stream().into_iter());
+                }
+
+                Some(next)
+            }
+        }
+
+        FlatStream::new(stream)
+            .filter_map(|tree| {
+                let TokenTree::Ident(ident) = tree else { return None };
+                Some(ident.to_string())
+            })
+            .any(|ident_str| ident_str == ident)
+    }
+
+    #[test]
+    fn can_parse() {
+        let meta = quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+
+        let func = quote! {
+            extern "system" fn nativeFoo<'local>(
+                mut env: JNIEnv<'local>,
+                this: JObject<'local>
+            ) -> jint {
+                123
+            }
+        };
+
+        let out = jni_method(meta, func);
+
+        assert!(contains_ident(out, "catch_unwind"));
+    }
+
+    fn parse_example_output() -> syn::ItemFn {
+        let meta = quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+
+        let func = quote! {
+            extern "system" fn nativeFoo<'local>(
+                mut env: JNIEnv<'local>,
+                this: JObject<'local>
+            ) -> jint {
+                123
+            }
+        };
+
+        syn::parse2(jni_method(meta, func)).expect("Proc macro output should be a function item")
+    }
+
+    #[test]
+    fn check_output_is_itemfn() {
+        let _item_fn = parse_example_output();
+    }
+
+    #[test]
+    fn check_output_export_name() {
+        let out = parse_example_output();
+
+        let export_name = out
+            .attrs
+            .iter()
+            .find_map(|attr| {
+                let syn::Meta::NameValue(nv) = &attr.meta else {
+                    return None;
+                };
+                if !nv.path.is_ident("export_name") {
+                    return None;
+                }
+                let syn::Expr::Lit(syn::ExprLit { lit: syn::Lit::Str(lit_str), .. }) = &nv.value
+                else {
+                    return None;
+                };
+                Some(lit_str.value())
+            })
+            .expect("Failed to find `export_name` attribute");
+        assert_eq!("Java_com_example_Foo_00024Inner_nativeFoo", export_name);
+    }
+
+    #[test]
+    fn check_output_allow_non_snake_case() {
+        let out = parse_example_output();
+
+        let _allow_attr = out
+            .attrs
+            .iter()
+            .find(|attr| {
+                let syn::Meta::List(ml) = &attr.meta else {
+                    return false;
+                };
+                if !ml.path.is_ident("allow") {
+                    return false;
+                }
+                let Ok(value) = syn::parse2::<syn::Path>(ml.tokens.clone()) else {
+                    return false;
+                };
+                value.is_ident("non_snake_case")
+            })
+            .expect("Failed to find `allow(non_snake_case)` attribute");
+    }
+
+    #[test]
+    fn no_panic_returns() {
+        let meta = quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+        };
+
+        let func = quote! {
+            extern "system" fn nativeFoo<'local>(
+                mut env: JNIEnv<'local>,
+                this: JObject<'local>
+            ) -> jint {
+                123
+            }
+        };
+
+        let out = jni_method(meta, func);
+        assert!(!contains_ident(out.clone(), "compile_error"));
+        assert!(!contains_ident(out, "catch_unwind"));
+    }
+
+    #[test]
+    fn missing_extern() {
+        let meta = quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+
+        let func = quote! {
+            fn nativeFoo<'local>(
+                mut env: JNIEnv<'local>,
+                this: JObject<'local>
+            ) -> jint {
+                123
+            }
+        };
+
+        let Err(err) = jni_method_inner(meta, func) else {
+            panic!("Should fail to generate code");
+        };
+
+        assert!(err
+            .to_string()
+            .contains("JNI methods are required to have the `extern \"system\"` ABI"));
+    }
+
+    #[test]
+    fn wrong_extern() {
+        let meta = quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+
+        let func = quote! {
+            extern "C" fn nativeFoo<'local>(
+                mut env: JNIEnv<'local>,
+                this: JObject<'local>
+            ) -> jint {
+                123
+            }
+        };
+
+        let Err(err) = jni_method_inner(meta, func) else {
+            panic!("Should fail to generate code");
+        };
+
+        assert!(err
+            .to_string()
+            .contains("JNI methods are required to have the `extern \"system\"` ABI"));
+    }
+
+    #[test]
+    fn already_mangled() {
+        let meta = quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+
+        let func = quote! {
+            extern "system" fn Java_com_example_Foo_00024Inner_nativeFoo<'local>(
+                mut env: JNIEnv<'local>,
+                this: JObject<'local>
+            ) -> jint {
+                123
+            }
+        };
+
+        let Err(err) = jni_method_inner(meta, func) else {
+            panic!("Should fail to generate code");
+        };
+
+        assert!(err
+            .to_string()
+            .contains("The `jni_method` attribute will perform the JNI name formatting"));
+    }
+}

diff --git a/nearby/util/pourover_macro_core/src/jni_method/meta.rs b/nearby/util/pourover_macro_core/src/jni_method/meta.rs
new file mode 100644
index 0000000..1e07edd
--- /dev/null
+++ b/nearby/util/pourover_macro_core/src/jni_method/meta.rs

@@ -0,0 +1,179 @@
+// Copyright 2024 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 syn::{
+    parse::{Parse, ParseStream},
+    Expr, Token,
+};
+
+use super::meta_arg::MetaArg;
+use super::substitutions::{substitute_class_chars, substitute_package_chars};
+
+pub struct JniMethodMeta {
+    /// The class descriptor in [export_name format](https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/design.html#resolving_native_method_names)
+    pub class_desc: String,
+    /// The expression to run when a panic is encountered. The value of this expression will be
+    /// returned by the annotated function.
+    pub panic_returns: Option<Expr>,
+}
+
+impl Parse for JniMethodMeta {
+    fn parse(stream: ParseStream<'_>) -> syn::Result<Self> {
+        let mut package = None;
+        let mut class = None;
+        let mut panic_returns = None;
+
+        type Structure = syn::punctuated::Punctuated<MetaArg, Token![,]>;
+
+        for arg in Structure::parse_terminated(stream)? {
+            match arg {
+                MetaArg::Package { package_token, value, .. } => {
+                    if let Some(_old) = package.replace(value) {
+                        return Err(syn::Error::new(
+                            package_token.span,
+                            "`package` should not be specified twice",
+                        ));
+                    }
+                }
+                MetaArg::Class { class_token, value, .. } => {
+                    if let Some(_old) = class.replace(value) {
+                        return Err(syn::Error::new(
+                            class_token.span,
+                            "`class` should not be specified twice",
+                        ));
+                    }
+                }
+                MetaArg::PanicReturns { panic_returns_token, value, .. } => {
+                    if let Some(_old) = panic_returns.replace(value) {
+                        return Err(syn::Error::new(
+                            panic_returns_token.span,
+                            "`panic_returns` should not be specified twice",
+                        ));
+                    }
+                }
+            }
+        }
+
+        let Some(package) = package else {
+            return Err(syn::Error::new(stream.span(), "`package` is required"));
+        };
+
+        let Some(class) = class else {
+            return Err(syn::Error::new(stream.span(), "`class` is required"));
+        };
+
+        let package = {
+            let package_str = package.value();
+            if package_str.contains('/') {
+                return Err(syn::Error::new(
+                    stream.span(),
+                    "`package` should use '.' as a separator",
+                ));
+            }
+            substitute_package_chars(&package_str)
+        };
+        let class = substitute_class_chars(&class.value());
+        let class_desc = format!("{package}_{class}");
+
+        Ok(Self { class_desc, panic_returns })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use syn::parse_quote;
+
+    #[test]
+    fn can_parse() {
+        let meta: JniMethodMeta = parse_quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+        assert_eq!("com_example_Foo_00024Inner", &meta.class_desc);
+        assert!(meta.panic_returns.is_some());
+    }
+
+    #[test]
+    fn can_parse_missing_panic_returns() {
+        let meta: JniMethodMeta = parse_quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+        };
+        assert_eq!("com_example_Foo_00024Inner", &meta.class_desc);
+        assert!(meta.panic_returns.is_none());
+    }
+
+    #[test]
+    #[should_panic]
+    fn double_package() {
+        let _: JniMethodMeta = parse_quote! {
+            package = "com.example",
+            package = "com.example",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+    }
+
+    #[test]
+    #[should_panic]
+    fn package_uses_slashes() {
+        let _: JniMethodMeta = parse_quote! {
+            package = "com/example",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+    }
+
+    #[test]
+    #[should_panic]
+    fn missing_package() {
+        let _: JniMethodMeta = parse_quote! {
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+    }
+
+    #[test]
+    #[should_panic]
+    fn double_class() {
+        let _: JniMethodMeta = parse_quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+            class = "Foo.Inner",
+            panic_returns = false,
+        };
+    }
+
+    #[test]
+    #[should_panic]
+    fn missing_class() {
+        let _: JniMethodMeta = parse_quote! {
+            package = "com.example",
+            panic_returns = false,
+        };
+    }
+
+    #[test]
+    #[should_panic]
+    fn double_panic_returns() {
+        let _: JniMethodMeta = parse_quote! {
+            package = "com.example",
+            class = "Foo.Inner",
+            panic_returns = false,
+            panic_returns = false,
+        };
+    }
+}

diff --git a/nearby/util/pourover_macro_core/src/jni_method/meta_arg.rs b/nearby/util/pourover_macro_core/src/jni_method/meta_arg.rs
new file mode 100644
index 0000000..aa28aa1
--- /dev/null
+++ b/nearby/util/pourover_macro_core/src/jni_method/meta_arg.rs

@@ -0,0 +1,92 @@
+// Copyright 2024 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 syn::{
+    parse::{Parse, ParseStream},
+    Expr, LitStr, Token,
+};
+
+/// Custom keywords
+pub mod kw {
+    syn::custom_keyword!(package);
+    syn::custom_keyword!(class);
+    syn::custom_keyword!(panic_returns);
+}
+
+/// Arguments to the attribute
+pub enum MetaArg {
+    Package { package_token: kw::package, _eq_token: Token![=], value: LitStr },
+    Class { class_token: kw::class, _eq_token: Token![=], value: LitStr },
+    PanicReturns { panic_returns_token: kw::panic_returns, _eq_token: Token![=], value: Expr },
+}
+
+impl Parse for MetaArg {
+    fn parse(stream: ParseStream<'_>) -> syn::Result<Self> {
+        let lookahead = stream.lookahead1();
+        if lookahead.peek(kw::package) {
+            Ok(MetaArg::Package {
+                package_token: stream.parse::<kw::package>()?,
+                _eq_token: stream.parse()?,
+                value: stream.parse()?,
+            })
+        } else if lookahead.peek(kw::class) {
+            Ok(MetaArg::Class {
+                class_token: stream.parse::<kw::class>()?,
+                _eq_token: stream.parse()?,
+                value: stream.parse()?,
+            })
+        } else if lookahead.peek(kw::panic_returns) {
+            Ok(MetaArg::PanicReturns {
+                panic_returns_token: stream.parse::<kw::panic_returns>()?,
+                _eq_token: stream.parse()?,
+                value: stream.parse()?,
+            })
+        } else {
+            Err(lookahead.error())
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use syn::parse_quote;
+
+    #[test]
+    fn parse_meta_arg_package() {
+        let MetaArg::Package { value, .. } = parse_quote!(package = "com.example") else {
+            panic!("failed to parse")
+        };
+
+        assert_eq!("com.example", value.value());
+    }
+
+    #[test]
+    fn parse_meta_arg_class() {
+        let MetaArg::Class { value, .. } = parse_quote!(class = "Foo") else {
+            panic!("failed to parse")
+        };
+
+        assert_eq!("Foo", value.value());
+    }
+
+    #[test]
+    fn parse_meta_arg_panic_returns() {
+        let MetaArg::PanicReturns { value, .. } = parse_quote!(panic_returns = { foo() }) else {
+            panic!("failed to parse")
+        };
+
+        let syn::Expr::Block(_) = value else { panic!("not a block expression") };
+    }
+}

diff --git a/nearby/util/pourover_macro_core/src/jni_method/substitutions.rs b/nearby/util/pourover_macro_core/src/jni_method/substitutions.rs
new file mode 100644
index 0000000..229bb5d
--- /dev/null
+++ b/nearby/util/pourover_macro_core/src/jni_method/substitutions.rs

@@ -0,0 +1,123 @@
+// Copyright 2024 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.
+
+//! Name substitutions for JNI name mangling. See
+//! <https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/design.html#resolving_native_method_names>
+//! for spec details.
+
+pub fn substitute_method_chars(s: &str) -> String {
+    s.chars()
+        .flat_map(|c| -> CharIter {
+            match c {
+                '$' => "_00024".into(),
+                '_' => "_1".into(),
+                _ => c.into(),
+            }
+        })
+        .collect()
+}
+
+pub fn substitute_package_chars(s: &str) -> String {
+    s.chars()
+        .flat_map(|c| -> CharIter {
+            match c {
+                '.' => "_".into(),
+                '$' => "_00024".into(),
+                '_' => "_1".into(),
+                _ => c.into(),
+            }
+        })
+        .collect()
+}
+
+pub fn substitute_class_chars(s: &str) -> String {
+    s.chars()
+        .flat_map(|c| -> CharIter {
+            match c {
+                // Use dot or dollar for inner classes: `'.' -> '$' -> "_00024"`
+                '.' | '$' => "_00024".into(),
+                '_' => "_1".into(),
+                _ => c.into(),
+            }
+        })
+        .collect()
+}
+
+/// A `char` iterator that can be created from either a `char` or a `&'static str`.
+enum CharIter {
+    One(core::option::IntoIter<char>),
+    Many(core::str::Chars<'static>),
+}
+
+impl Iterator for CharIter {
+    type Item = char;
+    fn next(&mut self) -> Option<char> {
+        match *self {
+            Self::One(ref mut iter) => iter.next(),
+            Self::Many(ref mut iter) => iter.next(),
+        }
+    }
+}
+
+impl From<char> for CharIter {
+    fn from(c: char) -> Self {
+        Self::One(Some(c).into_iter())
+    }
+}
+
+impl From<&'static str> for CharIter {
+    fn from(s: &'static str) -> Self {
+        Self::Many(s.chars())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_char_iter_one() {
+        let seq = CharIter::from('a').collect::<String>();
+        assert_eq!("a", &seq);
+    }
+
+    #[test]
+    fn test_char_iter_many() {
+        let seq = CharIter::from("asdf").collect::<String>();
+        assert_eq!("asdf", &seq);
+    }
+
+    #[test]
+    fn test_substitute_method_chars() {
+        let mangled = substitute_method_chars("method_with_under$cores");
+        assert_eq!("method_1with_1under_00024cores", &mangled);
+    }
+
+    #[test]
+    fn test_substitute_package_chars() {
+        let mangled = substitute_package_chars("com.weird_name.java");
+        assert_eq!("com_weird_1name_java", &mangled);
+    }
+
+    #[test]
+    fn test_substitute_class_chars() {
+        // Both dot and dollar should work here
+
+        let mangled = substitute_class_chars("Foo.Inner");
+        assert_eq!("Foo_00024Inner", &mangled);
+
+        let mangled = substitute_class_chars("Foo$Inner");
+        assert_eq!("Foo_00024Inner", &mangled);
+    }
+}

diff --git a/nearby/connections/connections_adv/connections_adv/src/lib.rs b/nearby/util/pourover_macro_core/src/lib.rs
similarity index 63%
copy from nearby/connections/connections_adv/connections_adv/src/lib.rs
copy to nearby/util/pourover_macro_core/src/lib.rs
index 4cfcdfa..ae06345 100644
--- a/nearby/connections/connections_adv/connections_adv/src/lib.rs
+++ b/nearby/util/pourover_macro_core/src/lib.rs

@@ -1,4 +1,4 @@
-// Copyright 2023 Google LLC
+// Copyright 2024 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,20 +12,5 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! Placeholder crate for connections advertisements
-
-/// placeholder
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+mod jni_method;
+pub use jni_method::jni_method;

diff --git a/third_party/abseil-cpp b/third_party/abseil-cpp
new file mode 160000
index 0000000..d87dc03
--- /dev/null
+++ b/third_party/abseil-cpp

@@ -0,0 +1 @@
+Subproject commit d87dc03cee90a0cac2dbf254217b346ca693bb83

diff --git a/third_party/benchmark b/third_party/benchmark
new file mode 160000
index 0000000..3d85343
--- /dev/null
+++ b/third_party/benchmark

@@ -0,0 +1 @@
+Subproject commit 3d85343d65832d05b4dcd6666640e0e38b981c33

diff --git a/third_party/boringssl b/third_party/boringssl
new file mode 160000
index 0000000..ab4037e
--- /dev/null
+++ b/third_party/boringssl

@@ -0,0 +1 @@
+Subproject commit ab4037e3d14b2b1e02c93f76d80a8dd0ce3193fc

diff --git a/third_party/fuzztest b/third_party/fuzztest
new file mode 160000
index 0000000..e6aca36
--- /dev/null
+++ b/third_party/fuzztest

@@ -0,0 +1 @@
+Subproject commit e6aca366a1c71b4a2d0c4d71b2040cc9b87a9ca4