Crypto++ Library

Crypto++ Library is a free C++ class library of cryptographic schemes. This library supports following algorithms: Panama, Salsa20, Sosemanuk,ES (Rijndael), RC6, MARS, Twofish, Serpent, CAST-256, IDEA, Triple-DES (DES-EDE2 and DES-EDE3), Camellia, RC5, Blowfish, TEA, XTEA, Skipjack, SHACAL-2, VMAC, HMAC, CBC-MAC, DMAC, Two-Track-MAC, SHA-1, SHA-2 (SHA-224, SHA-256, SHA-384, and SHA-512), Tiger, WHIRLPOOL, RIPEMD-128, RIPEMD-256, RIPEMD-160, RIPEMD-320, RSA, DSA, ElGamal, Nyberg-Rueppel (NR), Rabin, Rabin-Williams (RW), LUC, LUCELG, DLIES (variants of DHAES), ESIGN, Diffie-Hellman (DH), Unified Diffie-Hellman (DH2), Menezes-Qu-Vanstone (MQV), LUCDIF, XTR-DH, ECDSA, ECNR, ECIES, ECDH, ECMQV.

Website: http://www.cryptopp.com