@deftypefun {void} {gnutls_tdb_set_verify_func} (gnutls_tdb_t @var{tdb}, gnutls_tdb_verify_func @var{verify})
@var{tdb}: The trust storage

@var{verify}: The verification function

This function will associate a retrieval function with the
trust storage structure. The function is of the following form.

int gnutls_tdb_verify_func(const char* db_name, const char* host,
const char* service, const gnutls_datum_t* pubkey);

The verify function should return zero on a match, @code{GNUTLS_E_CERTIFICATE_KEY_MISMATCH} 
if there is a mismatch and any other negative error code otherwise.

The  @code{db_name} should be used to pass any private data to this function.
@end deftypefun