@deftypefun {int} {gnutls_privkey_sign_data2} (gnutls_privkey_t @var{signer}, gnutls_sign_algorithm_t @var{algo}, unsigned int @var{flags}, const gnutls_datum_t * @var{data}, gnutls_datum_t * @var{signature})
@var{signer}: Holds the key

@var{algo}: The signature algorithm used

@var{flags}: Zero or one of @code{gnutls_privkey_flags_t} 

@var{data}: holds the data to be signed

@var{signature}: will contain the signature allocated with @code{gnutls_malloc()} 

This function will sign the given data using the specified signature
algorithm. This function is an enhancement of @code{gnutls_privkey_sign_data()} ,
as it allows utilizing a alternative signature algorithm where possible
(e.g, use an RSA key with RSA-PSS).

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

@strong{Since:} 3.6.0
@end deftypefun