7.1 Available hash algorithms

GCRY_MD_NONE

This is not a real algorithm but used by some functions as an error return value. This constant is guaranteed to have the value 0.

GCRY_MD_SHA1

This is the SHA-1 algorithm which yields a message digest of 20 bytes.

GCRY_MD_RMD160

This is the 160 bit version of the RIPE message digest (RIPE-MD-160). Like SHA-1 it also yields a digest of 20 bytes.

GCRY_MD_MD5

This is the well known MD5 algorithm, which yields a message digest of 16 bytes.

GCRY_MD_MD4

This is the MD4 algorithm, which yields a message digest of 16 bytes.

GCRY_MD_MD2

This is an reserved identifier for MD-2; there is no implementation yet.

GCRY_MD_TIGER

This is the TIGER/192 algorithm which yields a message digest of 24 bytes.

GCRY_MD_HAVAL

This is an reserved for the HAVAL algorithm with 5 passes and 160 bit. It yields a message digest of 20 bytes. Note that there is no implementation yet available.

GCRY_MD_SHA224

This is the SHA-224 algorithm which yields a message digest of 28 bytes. See Change Notice 1 for FIPS 180-2 for the specification.

GCRY_MD_SHA256

This is the SHA-256 algorithm which yields a message digest of 32 bytes. See FIPS 180-2 for the specification.

GCRY_MD_SHA384

This is the SHA-384 algorithm which yields a message digest of 48 bytes. See FIPS 180-2 for the specification.

GCRY_MD_SHA512

This is the SHA-384 algorithm which yields a message digest of 64 bytes. See FIPS 180-2 for the specification.

GCRY_MD_CRC32

This is the ISO 3309 and ITU-T V.42 cyclic redundancy check. It yields an output of 4 bytes.

GCRY_MD_CRC32_RFC1510

This is the above cyclic redundancy check function, as modified by RFC 1510. It yields an output of 4 bytes.

GCRY_MD_CRC24_RFC2440

This is the OpenPGP cyclic redundancy check function. It yields an output of 3 bytes.

GCRY_MD_WHIRLPOOL

This is the Whirlpool algorithm which yields a message digest of 64 bytes.