www.aarongifford.com
Open Source (BSD Licensed) Secure Hash Algorithm (SHA) Implementations in C by Aaron Gifford, including SHA-1, SHA-224, SHA-256, SHA-384, and SHA-512
Open Source (BSD Licensed) Secure Hash Algorithm (SHA) Implementations in C by Aaron Gifford, including SHA-1, SHA-224, SHA-256, SHA-384, and SHA-512