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@deftypefun {void} {gnutls_psk_set_server_credentials_function} (gnutls_psk_server_credentials_t @var{cred}, gnutls_psk_server_credentials_function * @var{func})
@var{cred}: is a @code{gnutls_psk_server_credentials_t} type.
@var{func}: is the callback function
This function can be used to set a callback to retrieve the user's PSK credentials.
The callback's function form is:
int (*callback)(gnutls_session_t, const char* username,
gnutls_datum_t* key);
@code{username} contains the actual username.
The @code{key} must be filled in using the @code{gnutls_malloc()} .
In case the callback returned a negative number then gnutls will
assume that the username does not exist.
The callback function will only be called once per handshake. The
callback function should return 0 on success, while -1 indicates
an error.
@end deftypefun
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