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/*
* Copyright (c) 2012 Vincent Hanquez <vincent@snarc.org>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of his contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <wmmintrin.h>
#include <tmmintrin.h>
#include "aes.h"
static __m128i aes_128_key_expansion(__m128i key, __m128i keygened)
{
keygened = _mm_shuffle_epi32(keygened, _MM_SHUFFLE(3,3,3,3));
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
key = _mm_xor_si128(key, _mm_slli_si128(key, 4));
return _mm_xor_si128(key, keygened);
}
void aes_generate_key128(aes_key128 *key, uint8_t *ikey)
{
__m128i *k = (__m128i *) key->_data;
k[0] = _mm_loadu_si128((const __m128i*) ikey);
#define AES_128_key_exp(K, RCON) aes_128_key_expansion(K, _mm_aeskeygenassist_si128(K, RCON))
k[1] = AES_128_key_exp(k[0], 0x01);
k[2] = AES_128_key_exp(k[1], 0x02);
k[3] = AES_128_key_exp(k[2], 0x04);
k[4] = AES_128_key_exp(k[3], 0x08);
k[5] = AES_128_key_exp(k[4], 0x10);
k[6] = AES_128_key_exp(k[5], 0x20);
k[7] = AES_128_key_exp(k[6], 0x40);
k[8] = AES_128_key_exp(k[7], 0x80);
k[9] = AES_128_key_exp(k[8], 0x1B);
k[10] = AES_128_key_exp(k[9], 0x36);
/* generate decryption keys in reverse order.
* k[10] is shared by last encryption and first decryption rounds
* k[20] is shared by first encryption round (and is the original user key) */
k[11] = _mm_aesimc_si128(k[9]);
k[12] = _mm_aesimc_si128(k[8]);
k[13] = _mm_aesimc_si128(k[7]);
k[14] = _mm_aesimc_si128(k[6]);
k[15] = _mm_aesimc_si128(k[5]);
k[16] = _mm_aesimc_si128(k[4]);
k[17] = _mm_aesimc_si128(k[3]);
k[18] = _mm_aesimc_si128(k[2]);
k[19] = _mm_aesimc_si128(k[1]);
}
#define PRELOAD_ENC_KEYS(k) \
__m128i K0 = k[0]; __m128i K1 = k[1]; __m128i K2 = k[2]; __m128i K3 = k[3]; \
__m128i K4 = k[4]; __m128i K5 = k[5]; __m128i K6 = k[6]; __m128i K7 = k[7]; \
__m128i K8 = k[8]; __m128i K9 = k[9]; __m128i K10 = k[10];
#define DO_ENC_BLOCK(m) \
m = _mm_xor_si128(m, K0); \
m = _mm_aesenc_si128(m, K1); \
m = _mm_aesenc_si128(m, K2); \
m = _mm_aesenc_si128(m, K3); \
m = _mm_aesenc_si128(m, K4); \
m = _mm_aesenc_si128(m, K5); \
m = _mm_aesenc_si128(m, K6); \
m = _mm_aesenc_si128(m, K7); \
m = _mm_aesenc_si128(m, K8); \
m = _mm_aesenc_si128(m, K9); \
m = _mm_aesenclast_si128(m, K10);
#define PRELOAD_DEC_KEYS(k) \
__m128i K0 = k[10+0]; __m128i K1 = k[10+1]; __m128i K2 = k[10+2]; __m128i K3 = k[10+3]; \
__m128i K4 = k[10+4]; __m128i K5 = k[10+5]; __m128i K6 = k[10+6]; __m128i K7 = k[10+7]; \
__m128i K8 = k[10+8]; __m128i K9 = k[10+9]; __m128i K10 = k[0];
#define DO_DEC_BLOCK(m) \
m = _mm_xor_si128(m, K0); \
m = _mm_aesdec_si128(m, K1); \
m = _mm_aesdec_si128(m, K2); \
m = _mm_aesdec_si128(m, K3); \
m = _mm_aesdec_si128(m, K4); \
m = _mm_aesdec_si128(m, K5); \
m = _mm_aesdec_si128(m, K6); \
m = _mm_aesdec_si128(m, K7); \
m = _mm_aesdec_si128(m, K8); \
m = _mm_aesdec_si128(m, K9); \
m = _mm_aesdeclast_si128(m, K10);
void aes_encrypt(uint8_t *out, aes_key128 *key, uint8_t *in, uint32_t blocks)
{
uint32_t i;
uint64_t _out[2] __attribute__((aligned(16)));
__m128i *k = (__m128i *) key->_data;
PRELOAD_ENC_KEYS(k);
for (i = 0; i < blocks; i++, in += 16, out += 16) {
__m128i m = _mm_loadu_si128((__m128i *) in);
DO_ENC_BLOCK(m);
_mm_store_si128((__m128i *) _out, m);
((uint64_t *) out)[0] = (_out[0]);
((uint64_t *) out)[1] = (_out[1]);
}
}
void aes_decrypt(uint8_t *out, aes_key128 *key, uint8_t *in, uint32_t blocks)
{
uint32_t i;
uint64_t _out[2] __attribute__((aligned(16)));
__m128i *k = (__m128i *) key->_data;
PRELOAD_DEC_KEYS(k);
for (i = 0; i < blocks; i++, in += 16, out += 16) {
__m128i m = _mm_loadu_si128((__m128i *) in);
DO_DEC_BLOCK(m);
_mm_store_si128((__m128i *) _out, m);
((uint64_t *) out)[0] = (_out[0]);
((uint64_t *) out)[1] = (_out[1]);
}
}
void aes_encrypt_cbc(uint8_t *out, aes_key128 *key, uint8_t *_iv, uint8_t *in, uint32_t blocks)
{
uint32_t i;
uint64_t _out[2] __attribute__((aligned(16)));
__m128i *k = (__m128i *) key->_data;
__m128i iv = _mm_loadu_si128((__m128i *) _iv);
PRELOAD_ENC_KEYS(k);
for (i = 0; i < blocks; i++, in += 16, out += 16) {
__m128i m = _mm_loadu_si128((__m128i *) in);
m = _mm_xor_si128(m, iv);
DO_ENC_BLOCK(m);
_mm_store_si128((__m128i *) _out, m);
iv = m;
((uint64_t *) out)[0] = (_out[0]);
((uint64_t *) out)[1] = (_out[1]);
}
}
void aes_decrypt_cbc(uint8_t *out, aes_key128 *key, uint8_t *_iv, uint8_t *in, uint32_t blocks)
{
uint32_t i;
uint64_t _out[2] __attribute__((aligned(16)));
__m128i *k = (__m128i *) key->_data;
__m128i iv = _mm_loadu_si128((__m128i *) _iv);
PRELOAD_DEC_KEYS(k);
for (i = 0; i < blocks; i++, in += 16, out += 16) {
__m128i m = _mm_loadu_si128((__m128i *) in);
__m128i ivnext = m;
DO_DEC_BLOCK(m);
m = _mm_xor_si128(m, iv);
_mm_store_si128((__m128i *) _out, m);
iv = ivnext;
((uint64_t *) out)[0] = (_out[0]);
((uint64_t *) out)[1] = (_out[1]);
}
}
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