Ripemd160

Pure Scala implementation of RIPEMD-160 hash function.

Implementation follows the RIPEMD-160 specification by Dobbertin, Bosselaers, and Preneel. Cross-checked with BouncyCastle and official test vectors.

RIPEMD-160 processes 512-bit (64-byte) blocks and produces a 160-bit (20-byte) digest. It uses two parallel processing lines (left and right) that are combined after 80 rounds.