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/*
* Copyright (c) 2017, Vsevolod Stakhov
* Copyright (c) 2017, Frank Denis
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR ''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 AUTHOR 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 "config.h"
#include "ottery-internal.h"
#include "cryptobox.h"
#if defined(__x86_64__) && defined(RSPAMD_HAS_TARGET_ATTR)
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC push_options
#pragma GCC target("aes")
#endif
#ifndef __SSE2__
#define __SSE2__
#endif
#ifndef __SSE__
#define __SSE__
#endif
#ifndef __AES__
#define __AES__
#endif
#include <immintrin.h>
#define ROUNDS 10
typedef struct RSPAMD_ALIGNED(16) aes_rng_state {
__m128i round_keys[ROUNDS + 1];
__m128i counter;
} aes_stream_state;
#define STATE_LEN sizeof(aes_stream_state)
#define STATE_BYTES 16
#define OUTPUT_LEN 1024
static void
aes_key_expand (__m128i round_keys[ROUNDS + 1], __m128i t) __attribute__((target("aes")));
static void
aes_key_expand (__m128i round_keys[ROUNDS + 1], __m128i t)
{
__m128i t1;
#define DO_ROUND_KEY(ROUND, RC) \
do { \
t1 = _mm_aeskeygenassist_si128(t, (RC)); \
round_keys[ROUND] = t; \
t = _mm_xor_si128(t, _mm_slli_si128(t, 4)); \
t = _mm_xor_si128(t, _mm_slli_si128(t, 8)); \
t = _mm_xor_si128(t, _mm_shuffle_epi32(t1, 0xff)); \
} while (0)
DO_ROUND_KEY(0, 1);
DO_ROUND_KEY(1, 2);
DO_ROUND_KEY(2, 4);
DO_ROUND_KEY(3, 8);
DO_ROUND_KEY(4, 16);
DO_ROUND_KEY(5, 32);
DO_ROUND_KEY(6, 64);
DO_ROUND_KEY(7, 128);
DO_ROUND_KEY(8, 27);
DO_ROUND_KEY(9, 54);
round_keys[10] = t;
}
/*
* Computes one 128 bytes block and refresh keys
*/
static void
aes_round(unsigned char *buf, struct aes_rng_state *st) __attribute__((target("aes")));
static void
aes_round(unsigned char *buf, struct aes_rng_state *st)
{
const __m128i one = _mm_set_epi64x(0, 1);
__m128i *round_keys = st->round_keys;
__m128i c0, c1, c2, c3, c4, c5, c6, c7;
__m128i r0, r1, r2, r3, r4, r5, r6, r7;
__m128i s0, s1, s2, s3, s4, s5, s6, s7;
size_t i;
#define COMPUTE_ROUNDS(N) \
do { \
r##N = _mm_aesenc_si128( _mm_xor_si128(c##N, round_keys[0]), round_keys[1]); \
r##N = _mm_aesenc_si128(_mm_aesenc_si128(r##N, round_keys[2]), round_keys[3]); \
r##N = _mm_aesenc_si128(_mm_aesenc_si128(r##N, round_keys[4]), round_keys[5]); \
s##N = r##N; \
r##N = _mm_aesenc_si128(_mm_aesenc_si128(r##N, round_keys[6]), round_keys[7]); \
r##N = _mm_aesenc_si128(_mm_aesenc_si128(r##N, round_keys[8]), round_keys[9]); \
r##N = _mm_xor_si128(s##N, _mm_aesenclast_si128(r##N, round_keys[10])); \
} while (0)
c0 = st->counter;
for (i = 0; i < OUTPUT_LEN / 128; i ++) {
c1 = _mm_add_epi64 (c0, one);
c2 = _mm_add_epi64 (c1, one);
c3 = _mm_add_epi64 (c2, one);
c4 = _mm_add_epi64 (c3, one);
c5 = _mm_add_epi64 (c4, one);
c6 = _mm_add_epi64 (c5, one);
c7 = _mm_add_epi64 (c6, one);
COMPUTE_ROUNDS(0);
COMPUTE_ROUNDS(1);
COMPUTE_ROUNDS(2);
COMPUTE_ROUNDS(3);
COMPUTE_ROUNDS(4);
COMPUTE_ROUNDS(5);
COMPUTE_ROUNDS(6);
COMPUTE_ROUNDS(7);
c0 = _mm_add_epi64 (c7, one);
_mm_storeu_si128 ((__m128i *) (void *) (buf + 0), r0);
_mm_storeu_si128 ((__m128i *) (void *) (buf + 16), r1);
_mm_storeu_si128 ((__m128i *) (void *) (buf + 32), r2);
_mm_storeu_si128 ((__m128i *) (void *) (buf + 48), r3);
_mm_storeu_si128 ((__m128i *) (void *) (buf + 64), r4);
_mm_storeu_si128 ((__m128i *) (void *) (buf + 80), r5);
_mm_storeu_si128 ((__m128i *) (void *) (buf + 96), r6);
_mm_storeu_si128 ((__m128i *) (void *) (buf + 112), r7);
buf += 128;
}
st->counter = c0;
c0 = _mm_setzero_si128();
COMPUTE_ROUNDS(0);
aes_key_expand(round_keys, r0);
}
static void
aes_cryptobox_state_setup (void *state_, const uint8_t *bytes)
{
struct aes_rng_state *x = state_;
aes_key_expand (x->round_keys,
_mm_loadu_si128((const __m128i *) (const void *)bytes));
}
static void
aes_cryptobox_generate (void *state_, uint8_t *output, uint32_t idx)
{
struct aes_rng_state *x = state_;
aes_round(output, x);
}
#define PRF_AES(r) { \
"AES-" #r, \
"AES-" #r "-NOSIMD", \
"AES-" #r "-NOSIMD-DEFAULT", \
STATE_LEN, \
STATE_BYTES, \
OUTPUT_LEN, \
OTTERY_CPUCAP_AES, \
aes_cryptobox_state_setup, \
aes_cryptobox_generate \
}
const struct ottery_prf ottery_prf_aes_cryptobox_ = PRF_AES(128);
#endif /* x86_64 */
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