@deftypefun {int} {gnutls_x509_crt_get_signature} (gnutls_x509_crt_t @var{cert}, char * @var{sig}, size_t * @var{sig_size})
@var{cert}: should contain a @code{gnutls_x509_crt_t}  type

@var{sig}: a pointer where the signature part will be copied (may be null).

@var{sig_size}: initially holds the size of  @code{sig} 

This function will extract the signature field of a certificate.

@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS}  (0) is returned, otherwise a
negative error value.
@end deftypefun