8.3 Hash and MAC functions

The available operations to access hash functions and hash-MAC (HMAC) algorithms are shown below. HMAC algorithms provided keyed hash functionality. The supported MAC and HMAC algorithms are listed in Figure 8.3.

int gnutls_hmac_init (gnutls_hmac_hd_t * dig, gnutls_mac_algorithm_t algorithm, const void * key, size_t keylen)

int gnutls_hmac (gnutls_hmac_hd_t handle, const void * ptext, size_t ptext_len)

void gnutls_hmac_output (gnutls_hmac_hd_t handle, void * digest)

void gnutls_hmac_deinit (gnutls_hmac_hd_t handle, void * digest)

int gnutls_hmac_get_len (gnutls_mac_algorithm_t algorithm)

int gnutls_hmac_fast (gnutls_mac_algorithm_t algorithm, const void * key, size_t keylen, const void * ptext, size_t ptext_len, void * digest)

The available functions to access hash functions are shown below. The supported hash functions are shown in Figure 8.4.

int gnutls_hash_init (gnutls_hash_hd_t * dig, gnutls_digest_algorithm_t algorithm)

int gnutls_hash (gnutls_hash_hd_t handle, const void * ptext, size_t ptext_len)

void gnutls_hash_output (gnutls_hash_hd_t handle, void * digest)

void gnutls_hash_deinit (gnutls_hash_hd_t handle, void * digest)

int gnutls_hash_get_len (gnutls_digest_algorithm_t algorithm)

int gnutls_hash_fast (gnutls_digest_algorithm_t algorithm, const void * ptext, size_t ptext_len, void * digest)

int gnutls_fingerprint (gnutls_digest_algorithm_t algo, const gnutls_datum_t * data, void * result, size_t * result_size)