@deftypefun {gnutls_hash_hd_t} {gnutls_hash_copy} (gnutls_hash_hd_t @var{handle})
@var{handle}: is a @code{gnutls_hash_hd_t}  type

This function will create a copy of Message Digest context, containing all
its current state. Copying contexts for Message Digests registered using
@code{gnutls_crypto_register_digest()}  is not supported and will always result in
an error. In addition to that, some of the Message Digest implementations do
not support this operation. Applications should check the return value and
provide a proper fallback.

@strong{Returns:} new Message Digest context or NULL in case of an error.

@strong{Since:} 3.6.9
@end deftypefun