/*

 * Copyright (C) 2019 Red Hat, Inc.

 *

 * Author: Daiki Ueno

 *

 * This file is part of GnuTLS.

 *

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

 * under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3 of the License, or

 * (at your option) any later version.

 *

 * GnuTLS 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

 * 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/>

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <gnutls/crypto.h>

#include <assert.h>

#include <stdint.h>

#include <string.h>

#include "utils.h"

static void tls_log_func(int level, const char *str)

{

	fprintf(stderr, "<%d>| %s", level, str);

}

/* Test whether gnutls_aead_cipher_{en,de}crypt_vec works */

static void start(const char *name, int algo)

{

	int ret;

	gnutls_aead_cipher_hd_t ch;

	uint8_t key16[64];

	uint8_t iv16[32];

	uint8_t auth[128];

	uint8_t data[128+64];

	gnutls_datum_t key, iv;

	giovec_t iov[2];

	giovec_t auth_iov[2];

	uint8_t tag[64];

	size_t tag_size = 0;

	key.data = key16;

	key.size = gnutls_cipher_get_key_size(algo);

	assert(key.size <= sizeof(key16));

	iv.data = iv16;

	iv.size = gnutls_cipher_get_iv_size(algo);

	assert(iv.size <= sizeof(iv16));

	memset(iv.data, 0xff, iv.size);

	memset(key.data, 0xfe, key.size);

	memset(data, 0xfa, 128);

	memset(auth, 0xaa, sizeof(auth));

	iov[0].iov_base = data;

	iov[0].iov_len = 64;

	iov[1].iov_base = data + 64;

	iov[1].iov_len = 64;

	auth_iov[0].iov_base = auth;

	auth_iov[0].iov_len = 64;

	auth_iov[1].iov_base = auth + 64;

	auth_iov[1].iov_len = 64;

	success("trying %s\n", name);

	ret =

	    gnutls_aead_cipher_init(&ch, algo, &key);

	if (ret < 0)

		fail("gnutls_cipher_init: %s\n", gnutls_strerror(ret));

	ret = gnutls_aead_cipher_encryptv2(ch,

					   iv.data, iv.size,

					   auth_iov, 2,

					   iov, 2,

					   tag, &tag_size);

	if (ret < 0)

		fail("could not encrypt data: %s\n", gnutls_strerror(ret));

	ret = gnutls_aead_cipher_decryptv2(ch,

					   iv.data, iv.size,

					   auth_iov, 2,

					   iov, 2,

					   tag, tag_size);

	if (ret < 0)

		fail("could not decrypt data: %s\n", gnutls_strerror(ret));

	gnutls_aead_cipher_deinit(ch);

}

void

doit(void)

{

	int ret;

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(4711);

	ret = global_init();

	if (ret < 0) {

		fail("Cannot initialize library\n"); /*errcode 1 */

	}

	start("aes-128-gcm", GNUTLS_CIPHER_AES_128_GCM);

	start("aes-256-gcm", GNUTLS_CIPHER_AES_256_GCM);

	start("aes-128-ccm", GNUTLS_CIPHER_AES_128_CCM);

	if (!gnutls_fips140_mode_enabled())

		start("chacha20-poly1305", GNUTLS_CIPHER_CHACHA20_POLY1305);

	gnutls_global_deinit();

}