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/*
* Copyright (C) 2014-2015 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/>
*
*/
/*
* The following code is an implementation of the AES-128-CCM cipher
* using AESNI (without PCLMUL)
*/
#include "errors.h"
#include "gnutls_int.h"
#ifdef HAVE_LIBNETTLE
#include <gnutls/crypto.h>
#include "errors.h"
#include <aes-x86.h>
#include <x86-common.h>
#include <byteswap.h>
#include <nettle/ccm.h>
#include <aes-x86.h>
typedef struct ccm_x86_aes_ctx {
AES_KEY key;
} ccm_x86_aes_ctx;
/* CCM mode
*/
static void x86_aes_encrypt(const void *_ctx,
size_t length, uint8_t * dst,
const uint8_t * src)
{
AES_KEY *ctx = (void*)_ctx;
aesni_ecb_encrypt(src, dst, length, ctx, 1);
}
static int
aes_ccm_cipher_init(gnutls_cipher_algorithm_t algorithm, void **ctx,
int enc)
{
/* we use key size to distinguish */
if (algorithm != GNUTLS_CIPHER_AES_128_CCM &&
algorithm != GNUTLS_CIPHER_AES_256_CCM &&
algorithm != GNUTLS_CIPHER_AES_128_CCM_8 &&
algorithm != GNUTLS_CIPHER_AES_256_CCM_8)
return GNUTLS_E_INVALID_REQUEST;
*ctx = gnutls_calloc(1, sizeof(ccm_x86_aes_ctx));
if (*ctx == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
return 0;
}
static int
aes_ccm_cipher_setkey(void *_ctx, const void *key, size_t length)
{
struct ccm_x86_aes_ctx *ctx = _ctx;
aesni_set_encrypt_key(key, length*8, &ctx->key);
return 0;
}
static int
aes_ccm_aead_encrypt(void *_ctx,
const void *nonce, size_t nonce_size,
const void *auth, size_t auth_size,
size_t tag_size,
const void *plain, size_t plain_size,
void *encr, size_t encr_size)
{
struct ccm_x86_aes_ctx *ctx = _ctx;
/* proper AEAD cipher */
if (unlikely(encr_size < plain_size + tag_size))
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
ccm_encrypt_message(&ctx->key, x86_aes_encrypt,
nonce_size, nonce,
auth_size, auth,
tag_size,
plain_size+tag_size, encr,
plain);
return 0;
}
static int
aes_ccm_aead_decrypt(void *_ctx,
const void *nonce, size_t nonce_size,
const void *auth, size_t auth_size,
size_t tag_size,
const void *encr, size_t encr_size,
void *plain, size_t plain_size)
{
struct ccm_x86_aes_ctx *ctx = _ctx;
int ret;
if (unlikely(encr_size < tag_size))
return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
if (unlikely(plain_size < encr_size - tag_size))
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
ret = ccm_decrypt_message(&ctx->key, x86_aes_encrypt,
nonce_size, nonce,
auth_size, auth,
tag_size,
encr_size-tag_size, plain,
encr);
if (unlikely(ret == 0))
return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
return 0;
}
static void aes_ccm_deinit(void *_ctx)
{
struct ccm_x86_aes_ctx *ctx = _ctx;
zeroize_temp_key(ctx, sizeof(*ctx));
gnutls_free(ctx);
}
const gnutls_crypto_cipher_st _gnutls_aes_ccm_x86_aesni = {
.init = aes_ccm_cipher_init,
.setkey = aes_ccm_cipher_setkey,
.aead_encrypt = aes_ccm_aead_encrypt,
.aead_decrypt = aes_ccm_aead_decrypt,
.deinit = aes_ccm_deinit,
};
#endif
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