sha256

A modern binding to SHA256, HMAC, HKDF, and PBKDF2

A modern binding to SHA256, HMAC, HKDF, and PBKDF2 supporting precomputed HMAC keys, streaming, backtracking, bitstring inputs, and (de)serialization of intermediate states. Both HKDF and PBKDF2 reuse HMAC key computations for efficiency.