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/*
* Copyright (C) 2011-2012 Free Software Foundation, 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-GCM 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/gcm.h>
/* GCM mode
* It is used when the CPU doesn't include the PCLMUL instructions.
*/
struct gcm_x86_aes_ctx {
struct GCM_CTX(AES_KEY) inner;
size_t rekey_counter;
};
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 void x86_aes128_set_encrypt_key(void *_ctx, const uint8_t *key)
{
AES_KEY *ctx = _ctx;
aesni_set_encrypt_key(key, 16 * 8, ctx);
}
static void x86_aes192_set_encrypt_key(void *_ctx, const uint8_t *key)
{
AES_KEY *ctx = _ctx;
aesni_set_encrypt_key(key, 24 * 8, ctx);
}
static void x86_aes256_set_encrypt_key(void *_ctx, const uint8_t *key)
{
AES_KEY *ctx = _ctx;
aesni_set_encrypt_key(key, 32 * 8, ctx);
}
static int aes_gcm_cipher_init(gnutls_cipher_algorithm_t algorithm, void **_ctx,
int enc)
{
/* we use key size to distinguish */
if (algorithm != GNUTLS_CIPHER_AES_128_GCM &&
algorithm != GNUTLS_CIPHER_AES_192_GCM &&
algorithm != GNUTLS_CIPHER_AES_256_GCM)
return GNUTLS_E_INVALID_REQUEST;
*_ctx = gnutls_calloc(1, sizeof(struct gcm_x86_aes_ctx));
if (*_ctx == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
return 0;
}
static int aes_gcm_cipher_setkey(void *_ctx, const void *key, size_t length)
{
struct gcm_x86_aes_ctx *ctx = _ctx;
if (length == 16) {
GCM_SET_KEY(&ctx->inner, x86_aes128_set_encrypt_key,
x86_aes_encrypt, key);
} else if (length == 24) {
GCM_SET_KEY(&ctx->inner, x86_aes192_set_encrypt_key,
x86_aes_encrypt, key);
} else if (length == 32) {
GCM_SET_KEY(&ctx->inner, x86_aes256_set_encrypt_key,
x86_aes_encrypt, key);
} else
return GNUTLS_E_INVALID_REQUEST;
ctx->rekey_counter = 0;
return 0;
}
static int aes_gcm_setiv(void *_ctx, const void *iv, size_t iv_size)
{
struct gcm_x86_aes_ctx *ctx = _ctx;
if (iv_size != GCM_BLOCK_SIZE - 4)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
GCM_SET_IV(&ctx->inner, iv_size, iv);
ctx->rekey_counter = 0;
return 0;
}
static int aes_gcm_encrypt(void *_ctx, const void *src, size_t src_size,
void *dst, size_t length)
{
struct gcm_x86_aes_ctx *ctx = _ctx;
int ret;
if (unlikely(length < src_size))
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
ret = record_aes_gcm_encrypt_size(&ctx->rekey_counter, src_size);
if (ret < 0) {
return gnutls_assert_val(ret);
}
GCM_ENCRYPT(&ctx->inner, x86_aes_encrypt, src_size, dst, src);
return 0;
}
static int aes_gcm_decrypt(void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct gcm_x86_aes_ctx *ctx = _ctx;
if (unlikely(dst_size < src_size))
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
GCM_DECRYPT(&ctx->inner, x86_aes_encrypt, src_size, dst, src);
return 0;
}
static int aes_gcm_auth(void *_ctx, const void *src, size_t src_size)
{
struct gcm_x86_aes_ctx *ctx = _ctx;
GCM_UPDATE(&ctx->inner, src_size, src);
return 0;
}
static void aes_gcm_tag(void *_ctx, void *tag, size_t tagsize)
{
struct gcm_x86_aes_ctx *ctx = _ctx;
GCM_DIGEST(&ctx->inner, x86_aes_encrypt, tagsize, tag);
}
static void aes_gcm_deinit(void *_ctx)
{
struct gcm_x86_aes_ctx *ctx = _ctx;
zeroize_temp_key(ctx, sizeof(*ctx));
gnutls_free(ctx);
}
#include "aes-gcm-aead.h"
const gnutls_crypto_cipher_st _gnutls_aes_gcm_x86_aesni = {
.init = aes_gcm_cipher_init,
.setkey = aes_gcm_cipher_setkey,
.setiv = aes_gcm_setiv,
.aead_encrypt = aes_gcm_aead_encrypt,
.aead_decrypt = aes_gcm_aead_decrypt,
.encrypt = aes_gcm_encrypt,
.decrypt = aes_gcm_decrypt,
.deinit = aes_gcm_deinit,
.tag = aes_gcm_tag,
.auth = aes_gcm_auth,
};
#endif
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