@deftypefun {unsigned} {gnutls_hmac_get_len} (gnutls_mac_algorithm_t @var{algorithm})
@var{algorithm}: the hmac algorithm to use

This function will return the length of the output data
of the given hmac algorithm.

@strong{Returns:} The length or zero on error.

@strong{Since:} 2.10.0
@end deftypefun