Automated integer hash function discovery

Very small, readable implementation of the SHA3 hash function.

Fast software implementation in C of the FIPS 180-2 hash algorithms SHA-224, SHA-256, SHA-384 and SHA-512

Pure PHP implementation of Hashcash 1.

SHA-256 implementation

Geohash C implementation

Read-only release history for Crypt-RIPEMD160

crc16/crc32/crc64

A tiny implementation of the RIPEMD-160 hash function

sha1 hash alogrithm

Simple implementation of SHA1 in C

Aws Crypto Abstraction Layer: Cross-Platform, C99 wrapper for cryptography primitives.