v0.6.0

What's New

• Implemented ECDSA public key recovery from signature
• Added new elliptic curves: brainpoolP256r1, brainpoolP320r1, brainpoolP384r1,brainpoolP512r1, sepc384r1, sepc521r1
• Implemented modular square root
• Added new flexbuffer

What's Changed

• Refactored ec_curve_fp : Added functions for decompressing & encoding/decoding EC point
• Refactored & Fixed class bigint
• Updated example contract, added actions for new elliptic curves
• Updated test gen. scripts

Full Changelog: v0.5.0...v0.6.0

v0.5.0

What's New

• Implemented RSA PKCS#1v1.5 & RSASSA-PSS signature verification functions for SHA-384
• [Example] Added actions rsasha34 & rsapsssha34

What's Changed

• Eliminated potential RSA signature malleability when s >= n
• Fixed initializing ec_curve_fp constants
• Fixed ec_fixed_bigint for unaligned bit sizes
• Optimized passing of std::span and std::string_view objects to functions, potentially eliminating pointer indirection and aliasing
• Rename assert_rsa_sha1_assert to assert_rsa_sha1
• Rename buffer_base::alloc to buffer_base::resize
• Renamed word size function to bitsize_to_wordsize
• Updated test gen. scripts

Full Changelog: v0.4.0...v0.5.0

v0.4.0

What's New

• Implemented SHA-384 hash function
• Added ec_point_fp_jacobi which represents EC point in Jacobi coordinates.
  Utilizing Jacobi coordinates yields up to 25% greater efficiency in EC point addition, and up to 32% greater efficiency when elliptic curve coefficients are a = 0 or a = -3 (secp256k1 and secp256r1, respectively).

What's Changed

• Optimized point multiplication in Homogeneous coordinates and function ec_mul_add_fast to use NAF method (non-adjacent form representation of signed integer) for EC point-scalar multiplication.
  This optimization resulted in an additional up to 10% increase in efficiency for EC point multiplication.
• Optimized EC point doubling for the cases where elliptic curve coefficient a = 0 or a = -3 (secp256k1 and secp256r1, respectively).
• Optimized signature verification times of ecdsa_verify function by using ec_point_fp_jacobi as point types for scalar-point multiplication & addition
• Fixed bugs

Full Changelog: v0.3.0...v0.4.0

v0.3.0

What's New

• Added EC primitives, EC arithmetic operation and implemented ECDSA signature verification algorithm #5

Changes

• Improved verifying of RSA PCKS# v1.5 padding string #7

Full Changelog: v0.2.0...v0.3.0

v0.2.0

What's Changed

• Added SHA3-384 hash function
• Fixed broken implementation of SHA3-512
• Added fixed_bytes alias for std::array<byte_t, N>
• Added compile time from_hex which returns ack::fixed_bytes
• Refactored from_hex function to allow odd length hex string
• Updated copyright year
• Other bug fixes

Full Changelog: v0.1.0...v0.2.0

v0.1.0

Implemented algorithms:

• RSA PKCS#1 v1.5 signature verification
• RSASSA-PSS signature verification
• SHA3-256 and SHA3-512
• SHAKE128 and SHAKE256