@deftypefun {void} {gnutls_psk_set_server_params_function} (gnutls_psk_server_credentials_t @var{res}, gnutls_params_function * @var{func})
@var{res}: is a @code{gnutls_certificate_credentials_t}  type

@var{func}: is the function to be called

This function will set a callback in order for the server to get
the Diffie-Hellman parameters for PSK authentication.  The callback
should return @code{GNUTLS_E_SUCCESS}  (0) on success.

@strong{Deprecated:} This function is unnecessary and discouraged on GnuTLS 3.6.0
or later. Since 3.6.0, DH parameters are negotiated
following RFC7919.
@end deftypefun