, gnutls_mac_deinit_func DEINIT, gnutls_mac_fast_func
          HASH_FAST)
     ALGORITHM: is the gnutls MAC identifier

     PRIORITY: is the priority of the algorithm

     INIT: A function which initializes the MAC

     SETKEY: A function which sets the key of the MAC

     SETNONCE: A function which sets the nonce for the mac (may be
     ‘NULL’ for common MAC algorithms)

     HASH: Perform the hash operation

     OUTPUT: Provide the output of the MAC

     DEINIT: A function which deinitializes the MAC

     HASH_FAST: Perform the MAC operation in one go

     This function will register a MAC algorithm to be used by gnutls.
     Any algorithm registered will override the included algorithms and
     by convention kernel implemented algorithms have priority of 90 and
     CPU-assisted of 80.  The algorithm with the lowest priority will be
     used by gnutls.

     *Deprecated:* since 3.7.0 it is no longer possible to override
     cipher implementation

     *Returns:* ‘GNUTLS_E_SUCCESS’ on success, otherwise a negative
     error code.

     *Since:* 3.4.0

 -- Function: int gnutls_crypto_register_digest
          (gnutls_digest_algorithm_t ALGORITHM, int PRIORITY,
          gnutls_digest_init_func INIT, gnutls_digest_hash_func HASH,
          gnutls_digest_output_func OUTPUT, gnutls_digest_deinit_func
          DEINIT, gnutls_digest_fast_func HASH_FAST)
     ALGORITHM: is the gnutls digest identifier

     PRIORITY: is the priority of the algorithm

     INIT: A function which initializes the digest

     HASH: Perform the hash operation

     OUTPUT: Provide the output of the digest

     DEINIT: A function which deinitializes the digest

     HASH_FAST: Perform the digest operation in one go

     This function will register a digest algorithm to be used by
     gnutls.  Any algorithm registered will override the included
     algorithms and by convention kernel implemented algorithms have
     priority of 90 and CPU-assisted of 80.  The algorithm with the
     lowest priority will be used by gnutls.

     *Deprecated:* since 3.7.0 it is no longer possible to override
     cipher implementation

     *Returns:* ‘GNUTLS_E_SUCCESS’ on success, otherwise a negative
     error code.

     *Since:* 3.4.0