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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 <http://www.gnu.org/licenses/>
*
*/
/*
* The following code is an implementation of the AES-128-CBC cipher
* using VIA Padlock instruction set.
*/
#include "errors.h"
#include "gnutls_int.h"
#include <gnutls/crypto.h>
#include "errors.h"
#include <aes-x86.h>
#include <x86-common.h>
#ifdef HAVE_LIBNETTLE
# include <nettle/aes.h> /* for key generation in 192 and 256 bits */
# include <sha-padlock.h>
#endif
#include <aes-padlock.h>
static int
aes_cipher_init(gnutls_cipher_algorithm_t algorithm, void **_ctx, int enc)
{
/* we use key size to distinguish */
if (algorithm != GNUTLS_CIPHER_AES_128_CBC
&& algorithm != GNUTLS_CIPHER_AES_192_CBC
&& algorithm != GNUTLS_CIPHER_AES_256_CBC)
return GNUTLS_E_INVALID_REQUEST;
*_ctx = gnutls_calloc(1, sizeof(struct padlock_ctx));
if (*_ctx == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
((struct padlock_ctx *) (*_ctx))->enc = enc;
return 0;
}
int
padlock_aes_cipher_setkey(void *_ctx, const void *userkey, size_t keysize)
{
struct padlock_ctx *ctx = _ctx;
struct padlock_cipher_data *pce;
#ifdef HAVE_LIBNETTLE
struct aes_ctx nc;
#endif
memset(_ctx, 0, sizeof(struct padlock_cipher_data));
pce = ALIGN16(&ctx->expanded_key);
pce->cword.b.encdec = (ctx->enc == 0);
switch (keysize) {
case 16:
pce->cword.b.ksize = 0;
pce->cword.b.rounds = 10;
memcpy(pce->ks.rd_key, userkey, 16);
pce->cword.b.keygen = 0;
break;
#ifdef HAVE_LIBNETTLE
case 24:
pce->cword.b.ksize = 1;
pce->cword.b.rounds = 12;
goto common_24_32;
case 32:
pce->cword.b.ksize = 2;
pce->cword.b.rounds = 14;
common_24_32:
/* expand key using nettle */
if (ctx->enc)
aes_set_encrypt_key(&nc, keysize, userkey);
else
aes_set_decrypt_key(&nc, keysize, userkey);
memcpy(pce->ks.rd_key, nc.keys, sizeof(nc.keys));
pce->ks.rounds = nc.rounds;
pce->cword.b.keygen = 1;
break;
#endif
default:
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
padlock_reload_key();
return 0;
}
static int aes_setiv(void *_ctx, const void *iv, size_t iv_size)
{
struct padlock_ctx *ctx = _ctx;
struct padlock_cipher_data *pce;
pce = ALIGN16(&ctx->expanded_key);
if (iv_size < 16)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
memcpy(pce->iv, iv, 16);
return 0;
}
static int
padlock_aes_cbc_encrypt(void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct padlock_ctx *ctx = _ctx;
struct padlock_cipher_data *pce;
pce = ALIGN16(&ctx->expanded_key);
if (src_size > 0)
padlock_cbc_encrypt(dst, src, pce, src_size);
return 0;
}
static int
padlock_aes_cbc_decrypt(void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct padlock_ctx *ctx = _ctx;
struct padlock_cipher_data *pcd;
pcd = ALIGN16(&ctx->expanded_key);
if (src_size > 0)
padlock_cbc_encrypt(dst, src, pcd, src_size);
return 0;
}
static void aes_deinit(void *_ctx)
{
struct padlock_ctx *ctx = _ctx;
zeroize_temp_key(ctx, sizeof(*ctx));
gnutls_free(ctx);
}
const gnutls_crypto_cipher_st _gnutls_aes_padlock = {
.init = aes_cipher_init,
.setkey = padlock_aes_cipher_setkey,
.setiv = aes_setiv,
.encrypt = padlock_aes_cbc_encrypt,
.decrypt = padlock_aes_cbc_decrypt,
.deinit = aes_deinit,
};
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