feat: add transport cryptography primitives for v0.5.2 - #43
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🟡 Changes recommended
There are a few correctness/security/documentation issues in newly added APIs/tests that should be addressed before release (e.g., silent HMAC key fallback, flaky randomness test assertion, and overstated public-key “canonical” wording).
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Pull request overview
This PR releases tectonic-bedrock v0.5.2 by introducing new transport-neutral cryptographic building blocks (symmetric primitives, OS randomness, ephemeral ECDH, and conventional signatures) behind opt-in Cargo features, intended for use by protocol adapters like bedrock-tls.
Changes:
- Added a new
symmetricmodule (AEAD, SHA-2, HMAC/HKDF, AES block, ChaCha20 keystream) plus tests and error types. - Added
randomandkey-agreementmodules for OS CSPRNG access and ephemeral X25519/P-256/P-384 agreement. - Added
classical_signaturesupport for RSA/ECDSA/Ed25519 key loading, signing, verification, and public-key encoding, plus feature/documentation/release metadata updates.
File summaries
| File | Description |
|---|---|
| src/symmetric.rs | New transport-neutral symmetric primitives (AEAD, hashes, MAC/KDF, block/stream helpers) with tests. |
| src/random.rs | New OS randomness wrapper (getrandom) with a basic test. |
| src/key_agreement.rs | New ephemeral X25519/P-256/P-384 ECDH API with tests and secret zeroization for outputs. |
| src/classical_signature.rs | New RSA/ECDSA/Ed25519 key loading/sign/verify/public-key encoding APIs with tests. |
| src/lib.rs | Wires new modules behind classical-signatures, key-agreement, random, and symmetric features. |
| Cargo.toml | Bumps crate version to 0.5.2; adds new features and optional crypto dependencies (incl. RSA rc). |
| Cargo.lock | Locks new dependency set required by the added features. |
| README.md | Documents new features and usage examples; updates error-handling description. |
| CHANGELOG.md | Adds v0.5.2 release notes describing the newly introduced transport APIs/features. |
Review details
Suppressed comments (1)
src/symmetric.rs:339
HmacSha384Key::newsilently falls back to an all-zero default key ifnew_from_sliceever errors, which could turn a caller error into a catastrophic security issue. Prefer treating initialization failure as impossible (unwrap/expect) or making construction fallible.
pub fn new(key: &[u8]) -> Self {
Self(
RustCryptoHmac::<Sha384>::new_from_slice(key).unwrap_or_else(|_| {
<RustCryptoHmac<Sha384> as hmac::KeyInit>::new(&Default::default())
}),
- Files reviewed: 8/9 changed files
- Comments generated: 3
- Review effort level: Lite
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| pub struct $name([u8; $length]); | ||
|
|
||
| impl $name { | ||
| /// Returns the canonical fixed-width byte representation. |
| fn fills_the_requested_buffer() { | ||
| let mut bytes = [0u8; 32]; | ||
| assert!(fill(&mut bytes).is_ok()); | ||
| assert_ne!(bytes, [0u8; 32]); | ||
| } |
|
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📝 WalkthroughWalkthroughThe crate version advances to 0.5.2 and adds feature-gated APIs for symmetric cryptography, OS randomness, ephemeral key agreement, and classical signatures. ChangesCryptographic feature expansion
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: ⚪ Minimal · up to The PR adds the described transport cryptography APIs and passes the listed formatting, lint, test, documentation, and packaging checks; no actionable merge-blocking risk remains based on the available evidence. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 84.34% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 83 functions across 5 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In `@README.md`:
- Line 586: Update the three release examples in README.md to use the published
tectonic-bedrock v0.5.2 registry dependency instead of path = "../bedrock",
while preserving the existing default-features and symmetric feature settings.
In `@src/classical_signature.rs`:
- Around line 561-605: Add a test alongside
rsa_pkcs1_and_pkcs8_support_all_schemes that generates a 1024-bit RSA key,
verifies from_pkcs1_der rejects it with InvalidPrivateKey, and verifies rejects
its PKCS#1 public key with InvalidPublicKey using the existing RSA verification
path.
- Around line 364-381: Update the RsaPssSha256, RsaPssSha384, and RsaPssSha512
branches in the classical verification dispatch to use the RSA crate’s
auto-salt-length PSS verification constructor, allowing valid signatures with
variable salt lengths while preserving each branch’s digest algorithm.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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⛔ Files ignored due to path filters (1)
Cargo.lockis excluded by!**/*.lock
📒 Files selected for processing (8)
CHANGELOG.mdCargo.tomlREADME.mdsrc/classical_signature.rssrc/key_agreement.rssrc/lib.rssrc/random.rssrc/symmetric.rs
Included review availability: 9 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 10 reviews per hour.
📜 Review details
🔇 Additional comments (11)
Cargo.toml (1)
15-19: LGTM!Also applies to: 28-69
src/lib.rs (1)
24-25: LGTM!Also applies to: 43-44, 51-52, 55-56
README.md (2)
531-542: LGTM!
601-606: LGTM!CHANGELOG.md (1)
8-29: LGTM!src/classical_signature.rs (4)
1-125: LGTM!
134-168: LGTM!
194-249: LGTM!
251-328: LGTM!src/random.rs (1)
11-13: LGTM!Also applies to: 20-24
src/key_agreement.rs (1)
137-137: 🔒 Security & PrivacyNo change needed: X25519 secret erasure is enabled.
The
key-agreementfeature includesx25519-dalek/zeroize, and the dependency does not disable default features.
Summary
Validation
Review note
The RSA backend is rsa 0.10.0-rc.18, the latest available release, but it remains a release candidate.
Summary by CodeRabbit