quantum_crypto 0.0.2

An advanced, Post-Quantum Cryptography suite for Flutter, powered by Rust.

0.0.2

• SLH-DSA (FIPS 205) stateless hash-based signatures — SLH-DSA-SHA2-128f (Level 1), -192f (Level 3), -256f (Level 5) via a new slh_dsa API (QuantumCrypto.slhDsa). Detached signatures whose security rests solely on hash-function strength — no lattice assumptions. Only the fast-signing f parameter sets are exposed; see the Rust docs for the size/speed trade-off vs ML-DSA.

• XChaCha20-Poly1305 AEAD cipher — 24-byte random nonces, safe without a counter. Available in aead, streaming, and secure-messaging APIs as AeadAlgorithm.xChaCha20Poly1305 (wire format: 24-byte nonce || ciphertext+tag).

• HKDF hash agility — hkdfDeriveWithHash / hkdfDeriveMultiWithHash with explicit HkdfHash.sha256 / sha384 / sha512 selection (QuantumCrypto.kdf, optional hash parameter, defaults to SHA-256).

• One-shot hash API — SHA-256/384/512 and SHA3-256/512 via a new hash service (QuantumCrypto.hash).

• benchmarkSlhDsaByName — per-variant SLH-DSA benchmarks; sign iterations are clamped to at most 5 (SLH-DSA signing is ~100× slower than ML-DSA by design). The Rust suite also covers XChaCha20-Poly1305 and the new hash algorithms.

• Refactored the Rust api/ layer to clean-code patterns: each module documents its FFI contract, DTO conversions use From impls, shared validation/payload/nonce helpers are extracted (kdf, secure_messaging, streaming), and the benchmark suite uses typed algorithm tables instead of stringly-typed dispatch.

• Unknown algorithm names in the benchmark API now return descriptive errors instead of silently falling back to a default variant.

• hex_to_bytes accepts an optional 0x prefix and reports the offending byte position; Base64 decoders tolerate surrounding whitespace.

• bytes_to_hex no longer allocates per byte (lookup-table encoder).

• Eliminated needless secret-key cloning at the KEM/DSA/hybrid FFI boundary: key bytes are now moved out of their zeroizing containers via into_bytes() / into_parts(), so no duplicate copies of secret material linger in memory.

0.0.1

• Initial release.