File: gnutls_psk_set_client_credentials_function

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@deftypefun {void} {gnutls_psk_set_client_credentials_function} (gnutls_psk_client_credentials_t         @var{cred}, gnutls_psk_client_credentials_function         * @var{func})
@var{cred}: is a @code{gnutls_psk_server_credentials_t}  structure.

@var{func}: is the callback function

This function can be used to set a callback to retrieve the username and
password for client PSK authentication.
The callback's function form is:
int (*callback)(gnutls_session_t, char** username,
gnutls_datum_t* key);

The  @code{username} and  @code{key} ->data must be allocated using @code{gnutls_malloc()} .
 @code{username} should be ASCII strings or UTF-8 strings prepared using
the "SASLprep" profile of "stringprep".

The callback function will be called once per handshake.

The callback function should return 0 on success.
-1 indicates an error.
@end deftypefun