@deftypefun {int} {gnutls_privkey_decrypt_data2} (gnutls_privkey_t @var{key}, unsigned int @var{flags}, const gnutls_datum_t * @var{ciphertext}, unsigned char * @var{plaintext}, size_t @var{plaintext_size})
@var{key}: Holds the key

@var{flags}: zero for now

@var{ciphertext}: holds the data to be decrypted

@var{plaintext}: a preallocated buffer that will be filled with the plaintext

@var{plaintext_size}: in/out size of the plaintext

This function will decrypt the given data using the algorithm
supported by the private key. Unlike with @code{gnutls_privkey_decrypt_data()} 
this function operates in constant time and constant memory access.

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

@strong{Since:} 3.6.5
@end deftypefun