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2026-03-07 20:07:02 +08:00

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

0.1.0 - 2025-03-07

SM2 elliptic curve cryptography (GB/T 32918.1-5-2016)
- Key generation, digital signature (with Z-value), public key encryption/decryption
- Complete addition formulas for constant-time point operations
- Fixed-window (w=4) base point scalar multiplication with precomputed table
- Mixed Jacobian-Affine addition for optimized verification (Shamir's trick)
- Point compression/decompression (GB/T 32918.1 section 4.2.10)
SM3 cryptographic hash (GB/T 32905-2016)
- Streaming and one-shot hashing API
- HMAC-SM3 with automatic key material zeroization
SM4 block cipher (GB/T 32907-2016)
- Boolean circuit bitslice S-box (cache-timing resistant)
- 8 modes of operation: ECB, CBC, OFB, CFB, CTR, GCM, CCM, XTS
- GCM/CCM authenticated encryption with constant-time tag verification
SM9 identity-based cryptography (GB/T 38635.1-2-2020)
- BN256 pairing (optimal Ate with Miller loop + final exponentiation)
- Fp12 tower extension: Fp -> Fp2(u^2+2) -> Fp6(v^3-u) -> Fp12(w^2-v)
- Identity-based signing and verification
- Identity-based encryption and decryption
Unified Error enum with Display and conditional std::error::Error impl
no_std support with optional alloc and std features
#![forbid(unsafe_code)] enforced at crate level
Automatic private key zeroization via zeroize::ZeroizeOnDrop
GB/T standard test vectors for all algorithms

GCM gf128_mul: replaced secret-dependent if branches with mask arithmetic
SM2 is_infinity: replaced short-circuit Iterator::all with ConstantTimeEq
SM2 add: replaced 3 conditional branches with complete addition formulas + conditional_select
SM2 double: replaced if is_infinity() with conditional_select
HMAC-SM3: added zeroize for k_pad/ipad/opad key material on stack
CCM: reject AAD > 510 bytes instead of silently skipping
XTS: reject non-16-byte-aligned input instead of silently truncating
SM9 hash_to_range: replaced variable-iteration while loop with constant-time conditional select