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/*
* Copyright (C) 2011 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 3 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 intel's AES instruction set.
*/
#include <gnutls_errors.h>
#include <gnutls_int.h>
#include <gnutls/crypto.h>
#include <gnutls_errors.h>
#include <aes-x86.h>
#include <x86.h>
struct aes_ctx
{
AES_KEY expanded_key;
uint8_t iv[16];
int enc;
};
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 aes_ctx));
if (*_ctx == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
((struct aes_ctx*)(*_ctx))->enc = enc;
return 0;
}
static int
aes_cipher_setkey (void *_ctx, const void *userkey, size_t keysize)
{
struct aes_ctx *ctx = _ctx;
int ret;
if (ctx->enc)
ret = aesni_set_encrypt_key (userkey, keysize * 8, ALIGN16(&ctx->expanded_key));
else
ret = aesni_set_decrypt_key (userkey, keysize * 8, ALIGN16(&ctx->expanded_key));
if (ret != 0)
return gnutls_assert_val (GNUTLS_E_ENCRYPTION_FAILED);
return 0;
}
static int
aes_setiv (void *_ctx, const void *iv, size_t iv_size)
{
struct aes_ctx *ctx = _ctx;
memcpy (ctx->iv, iv, 16);
return 0;
}
static int
aes_encrypt (void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct aes_ctx *ctx = _ctx;
aesni_cbc_encrypt (src, dst, src_size, ALIGN16(&ctx->expanded_key), ctx->iv, 1);
return 0;
}
static int
aes_decrypt (void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct aes_ctx *ctx = _ctx;
aesni_cbc_encrypt (src, dst, src_size, ALIGN16(&ctx->expanded_key), ctx->iv, 0);
return 0;
}
static void
aes_deinit (void *_ctx)
{
gnutls_free (_ctx);
}
static const gnutls_crypto_cipher_st cipher_struct = {
.init = aes_cipher_init,
.setkey = aes_cipher_setkey,
.setiv = aes_setiv,
.encrypt = aes_encrypt,
.decrypt = aes_decrypt,
.deinit = aes_deinit,
};
static unsigned
check_optimized_aes (void)
{
unsigned int a, b, c, d;
_gnutls_cpuid (1, &a, &b, &c, &d);
return (c & 0x2000000);
}
#ifdef ASM_X86_64
static unsigned
check_pclmul (void)
{
unsigned int a, b, c, d;
_gnutls_cpuid (1, &a, &b, &c, &d);
return (c & 0x2);
}
#endif
static unsigned
check_intel_or_amd (void)
{
unsigned int a, b, c, d;
_gnutls_cpuid (0, &a, &b, &c, &d);
if ((memcmp (&b, "Genu", 4) == 0 &&
memcmp (&d, "ineI", 4) == 0 &&
memcmp (&c, "ntel", 4) == 0) ||
(memcmp (&b, "Auth", 4) == 0 &&
memcmp (&d, "enti", 4) == 0 && memcmp (&c, "cAMD", 4) == 0))
{
return 1;
}
return 0;
}
void
register_x86_crypto (void)
{
int ret;
if (check_intel_or_amd () == 0)
return;
if (check_optimized_aes ())
{
_gnutls_debug_log ("Intel AES accelerator was detected\n");
ret =
gnutls_crypto_single_cipher_register (GNUTLS_CIPHER_AES_128_CBC, 80,
&cipher_struct);
if (ret < 0)
{
gnutls_assert ();
}
ret =
gnutls_crypto_single_cipher_register (GNUTLS_CIPHER_AES_192_CBC, 80,
&cipher_struct);
if (ret < 0)
{
gnutls_assert ();
}
ret =
gnutls_crypto_single_cipher_register (GNUTLS_CIPHER_AES_256_CBC, 80,
&cipher_struct);
if (ret < 0)
{
gnutls_assert ();
}
#ifdef ASM_X86_64
if (check_pclmul ())
{
/* register GCM ciphers */
_gnutls_debug_log ("Intel GCM accelerator was detected\n");
ret =
gnutls_crypto_single_cipher_register (GNUTLS_CIPHER_AES_128_GCM,
80, &aes_gcm_struct);
if (ret < 0)
{
gnutls_assert ();
}
ret =
gnutls_crypto_single_cipher_register (GNUTLS_CIPHER_AES_256_GCM,
80, &aes_gcm_struct);
if (ret < 0)
{
gnutls_assert ();
}
if (ret >= 0)
_gnutls_priority_prefer_aes_gcm();
}
#endif
}
return;
}
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