/*

 * Copyright (C) 2000-2012 Free Software Foundation, Inc.

 * Copyright (C) 2017 Red Hat, Inc.

 *

 * Author: Nikos Mavrogiannopoulos

 *

 * This file is part of GnuTLS.

 *

 * The GnuTLS is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public License

 * as published by the Free Software Foundation; either version 2.1 of

 * the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>

 *

 */

/* This file contains the Anonymous Diffie-Hellman key exchange part of

 * the anonymous authentication. The functions here are used in the

 * handshake.

 */

#include "gnutls_int.h"

#if defined(ENABLE_ANON) && defined(ENABLE_DHE)

#include "auth.h"

#include "errors.h"

#include "dh.h"

#include "auth/anon.h"

#include "num.h"

#include "mpi.h"

#include <state.h>

#include <auth/dh_common.h>

static int gen_anon_server_kx(gnutls_session_t, gnutls_buffer_st *);

static int proc_anon_client_kx(gnutls_session_t, uint8_t *, size_t);

static int proc_anon_server_kx(gnutls_session_t, uint8_t *, size_t);

const mod_auth_st anon_auth_struct = {

	"ANON",

	NULL,

	NULL,

	gen_anon_server_kx,

	_gnutls_gen_dh_common_client_kx,	/* this can be shared */

	NULL,

	NULL,

	NULL,

	NULL,			/* certificate */

	proc_anon_server_kx,

	proc_anon_client_kx,

	NULL,

	NULL

};

static int

gen_anon_server_kx(gnutls_session_t session, gnutls_buffer_st * data)

{

	int ret;

	gnutls_anon_server_credentials_t cred;

	cred = (gnutls_anon_server_credentials_t)

	    _gnutls_get_cred(session, GNUTLS_CRD_ANON);

	if (cred == NULL) {

		gnutls_assert();

		return GNUTLS_E_INSUFFICIENT_CREDENTIALS;

	}

	if ((ret =

	     _gnutls_auth_info_init(session, GNUTLS_CRD_ANON,

				   sizeof(anon_auth_info_st), 1)) < 0) {

		gnutls_assert();

		return ret;

	}

	ret = _gnutls_figure_dh_params(session, cred->dh_params, cred->params_func, cred->dh_sec_param);

	if (ret < 0) {

		return gnutls_assert_val(ret);

	}

	ret =

	    _gnutls_dh_common_print_server_kx(session, data);

	if (ret < 0) {

		gnutls_assert();

	}

	return ret;

}

static int

proc_anon_client_kx(gnutls_session_t session, uint8_t * data,

		    size_t _data_size)

{

	return

	    _gnutls_proc_dh_common_client_kx(session, data, _data_size, NULL);

}

int

proc_anon_server_kx(gnutls_session_t session, uint8_t * data,

		    size_t _data_size)

{

	int ret;

	/* set auth_info */

	if ((ret =

	     _gnutls_auth_info_init(session, GNUTLS_CRD_ANON,

				   sizeof(anon_auth_info_st), 1)) < 0) {

		gnutls_assert();

		return ret;

	}

	ret = _gnutls_proc_dh_common_server_kx(session, data, _data_size);

	if (ret < 0) {

		gnutls_assert();

		return ret;

	}

	return 0;

}

#endif				/* ENABLE_ANON */