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/*
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* Copyright (C) 2011-2012 Free Software Foundation, Inc.
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* Copyright (C) 2020 Red Hat, Inc.
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*
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* Authors: Nikos Mavrogiannopoulos, Anderson Toshiyuki Sasaki
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*
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* This file is part of GnuTLS.
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*
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* The GnuTLS is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>
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*
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*/
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/*
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* The following code wraps the CRYPTOGAMS implementation of the AES-XTS cipher
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* using Intel's AES instruction set.
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*/
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#include "errors.h"
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#include "gnutls_int.h"
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#include "fips.h"
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#include <gnutls/crypto.h>
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#include <aes-x86.h>
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#include <x86-common.h>
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struct x86_aes_xts_ctx {
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AES_KEY block_key;
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AES_KEY tweak_key;
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uint8_t iv[16];
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int enc;
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};
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static int
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x86_aes_xts_cipher_init(gnutls_cipher_algorithm_t algorithm, void **_ctx,
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int enc)
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{
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if (algorithm != GNUTLS_CIPHER_AES_128_XTS &&
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algorithm != GNUTLS_CIPHER_AES_256_XTS)
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return GNUTLS_E_INVALID_REQUEST;
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*_ctx = gnutls_calloc(1, sizeof(struct x86_aes_xts_ctx));
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if (*_ctx == NULL) {
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gnutls_assert();
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return GNUTLS_E_MEMORY_ERROR;
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}
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((struct x86_aes_xts_ctx *) (*_ctx))->enc = enc;
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return 0;
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}
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static int
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x86_aes_xts_cipher_setkey(void *_ctx, const void *userkey, size_t keysize)
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{
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struct x86_aes_xts_ctx *ctx = _ctx;
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int ret;
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size_t keybits;
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const uint8_t *key = userkey;
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if ((keysize != 32) && (keysize != 64))
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return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
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/* Check key block according to FIPS-140-2 IG A.9 */
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if (_gnutls_fips_mode_enabled()){
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if (gnutls_memcmp(key, key + (keysize / 2), keysize / 2) == 0) {
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_gnutls_switch_lib_state(LIB_STATE_ERROR);
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return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
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}
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}
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/* Size in bits of each half for block and tweak (=keysize * 8 / 2) */
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keybits = keysize * 4;
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if (ctx->enc)
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ret =
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aesni_set_encrypt_key(key, keybits,
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ALIGN16(&ctx->block_key));
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else
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ret =
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aesni_set_decrypt_key(key, keybits,
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ALIGN16(&ctx->block_key));
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if (ret != 0)
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return gnutls_assert_val(GNUTLS_E_ENCRYPTION_FAILED);
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ret =
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aesni_set_encrypt_key(key + (keysize / 2), keybits,
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ALIGN16(&ctx->tweak_key));
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if (ret != 0)
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return gnutls_assert_val(GNUTLS_E_ENCRYPTION_FAILED);
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return 0;
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}
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static int x86_aes_xts_setiv(void *_ctx, const void *iv, size_t iv_size)
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{
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struct x86_aes_xts_ctx *ctx = _ctx;
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if (iv_size != 16)
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return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
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memcpy(ctx->iv, iv, 16);
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return 0;
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}
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static int
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x86_aes_xts_encrypt(void *_ctx, const void *src, size_t src_size,
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void *dst, size_t dst_size)
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{
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struct x86_aes_xts_ctx *ctx = _ctx;
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if (src_size < 16)
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return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
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aesni_xts_encrypt(src, dst, src_size, ALIGN16(&ctx->block_key),
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ALIGN16(&ctx->tweak_key), ctx->iv);
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return 0;
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}
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static int
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x86_aes_xts_decrypt(void *_ctx, const void *src, size_t src_size,
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void *dst, size_t dst_size)
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{
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struct x86_aes_xts_ctx *ctx = _ctx;
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if (src_size < 16)
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return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
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aesni_xts_decrypt(src, dst, src_size, ALIGN16(&ctx->block_key),
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ALIGN16(&ctx->tweak_key), ctx->iv);
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return 0;
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}
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static void x86_aes_xts_deinit(void *_ctx)
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{
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struct x86_aes_xts_ctx *ctx = _ctx;
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zeroize_temp_key(ctx, sizeof(*ctx));
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gnutls_free(ctx);
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}
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const gnutls_crypto_cipher_st _gnutls_aes_xts_x86_aesni = {
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.init = x86_aes_xts_cipher_init,
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.setkey = x86_aes_xts_cipher_setkey,
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.setiv = x86_aes_xts_setiv,
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.encrypt = x86_aes_xts_encrypt,
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.decrypt = x86_aes_xts_decrypt,
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.deinit = x86_aes_xts_deinit,
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};
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