Rscrypto

rscrypto v0.3.0 is the RSA and validation-hardening release.

Highlights:

• RSA is now a full first-class primitive: strict DER import/export, RSA-PSS, RSASSA-PKCS1-v1_5, OAEP, RSAES-PKCS1-v1_5, key generation, X.509/JWT/COSE/TLS profile mapping, blinded private operations, and
  reusable scratch APIs.
• RSA verification coverage landed with vectors, fuzzing, oracle checks, and benchmark fixtures.
• RSA private operations and assembly-backed paths were completed.
• Ed25519 assembly backends were added.
• RSA public verification was tightened: 8192-bit verifier backend coverage widened, public Montgomery precompute deferred, and brittle scratch allocation assertions removed.
• CI validation was hardened: Miri now focuses on UB-risk coverage, weekly validation timeouts were widened, SHA3 fuzz builds were fixed, workflow cancellation was scoped, and action pins / lockfiles were
  refreshed.
• Benchmark docs were refreshed with the 2026-05-27 Linux CI scorecard, including RSA rows.

Performance snapshot from the latest public benchmark pass:

• 1.61x Linux CI fastest-external geomean.
• 3,545 wins / 5,832 fastest-external comparisons.
• 5,210 wins-or-ties / 5,832 comparisons.
• Checksums: 5.03x geomean.
• SHA-3 / SHAKE: 2.15x / 1.86x geomean.
• BLAKE3 >=64 KiB: 2.31x geomean.
• AEAD: 1.57x geomean.
• RSA import + verify: 1.32x geomean, with RSA verify-only still at 0.98x.

Known pressure points remain visible and intentional: PBKDF2-SHA256 low-iteration setup, X25519 DH, RSA verification on some Arm/RISC-V rows, and small-message AEAD overhead. If you're really interested in them check the benchmark_results/OVERVIEW.md file.

Get it:

[dependencies]
rscrypto = { version = "0.3.0", default-features = false, features = ["sha2"] }

Full toolbox with OS randomness:

[dependencies]
rscrypto = { version = "0.3.0", features = ["full", "getrandom"] }

References:

• Crates.io: https://crates.io/crates/rscrypto/0.3.0
• Docs.rs: https://docs.rs/rscrypto/0.3.0/rscrypto/
• Changelog: https://github.com/loadingalias/rscrypto/blob/main/CHANGELOG.md
• Benchmarks: https://github.com/loadingalias/rscrypto/blob/main/benchmark_results/OVERVIEW.md
• CI: https://github.com/loadingalias/rscrypto/actions/runs/26613890550
• Compare: https://github.com/loadingalias/rscrypto/compare/v0.2.0...v0.3.0