@deftypefun {int} {gnutls_psk_set_server_known_dh_params} (gnutls_psk_server_credentials_t @var{res}, gnutls_sec_param_t @var{sec_param})
@var{res}: is a gnutls_psk_server_credentials_t type

@var{sec_param}: is an option of the @code{gnutls_sec_param_t}  enumeration

This function will set the Diffie-Hellman parameters for a
PSK server to use. These parameters will be used in
Ephemeral Diffie-Hellman cipher suites and will be selected from
the FFDHE set of RFC7919 according to the security level provided.

@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.

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

@strong{Since:} 3.5.6
@end deftypefun