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/*
* Copyright (C) 2011-2012 Free Software Foundation, Inc.
* Copyright (C) 2020 Red Hat, Inc.
*
* Authors: Nikos Mavrogiannopoulos, Anderson Toshiyuki Sasaki
*
* 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 wraps the CRYPTOGAMS implementation of the AES-XTS cipher
* using Intel's AES instruction set.
*/
#include "errors.h"
#include "gnutls_int.h"
#include "fips.h"
#include <gnutls/crypto.h>
#include <aes-x86.h>
#include <x86-common.h>
struct x86_aes_xts_ctx {
AES_KEY block_key;
AES_KEY tweak_key;
uint8_t iv[16];
int enc;
};
static int
x86_aes_xts_cipher_init(gnutls_cipher_algorithm_t algorithm, void **_ctx,
int enc)
{
if (algorithm != GNUTLS_CIPHER_AES_128_XTS &&
algorithm != GNUTLS_CIPHER_AES_256_XTS)
return GNUTLS_E_INVALID_REQUEST;
*_ctx = gnutls_calloc(1, sizeof(struct x86_aes_xts_ctx));
if (*_ctx == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
((struct x86_aes_xts_ctx *) (*_ctx))->enc = enc;
return 0;
}
static int
x86_aes_xts_cipher_setkey(void *_ctx, const void *userkey, size_t keysize)
{
struct x86_aes_xts_ctx *ctx = _ctx;
int ret;
size_t keybits;
const uint8_t *key = userkey;
if ((keysize != 32) && (keysize != 64))
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
/* Check key block according to FIPS-140-2 IG A.9 */
if (_gnutls_fips_mode_enabled()){
if (gnutls_memcmp(key, key + (keysize / 2), keysize / 2) == 0) {
_gnutls_switch_lib_state(LIB_STATE_ERROR);
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
}
/* Size in bits of each half for block and tweak (=keysize * 8 / 2) */
keybits = keysize * 4;
if (ctx->enc)
ret =
aesni_set_encrypt_key(key, keybits,
ALIGN16(&ctx->block_key));
else
ret =
aesni_set_decrypt_key(key, keybits,
ALIGN16(&ctx->block_key));
if (ret != 0)
return gnutls_assert_val(GNUTLS_E_ENCRYPTION_FAILED);
ret =
aesni_set_encrypt_key(key + (keysize / 2), keybits,
ALIGN16(&ctx->tweak_key));
if (ret != 0)
return gnutls_assert_val(GNUTLS_E_ENCRYPTION_FAILED);
return 0;
}
static int x86_aes_xts_setiv(void *_ctx, const void *iv, size_t iv_size)
{
struct x86_aes_xts_ctx *ctx = _ctx;
if (iv_size != 16)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
memcpy(ctx->iv, iv, 16);
return 0;
}
static int
x86_aes_xts_encrypt(void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct x86_aes_xts_ctx *ctx = _ctx;
if (unlikely(dst_size < src_size))
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
if (src_size < 16)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
aesni_xts_encrypt(src, dst, src_size, ALIGN16(&ctx->block_key),
ALIGN16(&ctx->tweak_key), ctx->iv);
return 0;
}
static int
x86_aes_xts_decrypt(void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct x86_aes_xts_ctx *ctx = _ctx;
if (unlikely(dst_size < src_size))
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
if (src_size < 16)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
aesni_xts_decrypt(src, dst, src_size, ALIGN16(&ctx->block_key),
ALIGN16(&ctx->tweak_key), ctx->iv);
return 0;
}
static void x86_aes_xts_deinit(void *_ctx)
{
struct x86_aes_xts_ctx *ctx = _ctx;
zeroize_temp_key(ctx, sizeof(*ctx));
gnutls_free(ctx);
}
const gnutls_crypto_cipher_st _gnutls_aes_xts_x86_aesni = {
.init = x86_aes_xts_cipher_init,
.setkey = x86_aes_xts_cipher_setkey,
.setiv = x86_aes_xts_setiv,
.encrypt = x86_aes_xts_encrypt,
.decrypt = x86_aes_xts_decrypt,
.deinit = x86_aes_xts_deinit,
};
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