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chacha8-avx2.h
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chacha8-avx2.h
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#ifndef CHACHA8_AVX2_H
#define CHACHA8_AVX2_H
#include <immintrin.h>
#include <stdio.h>
#include <stdint.h>
// ChaCha8 using SIMD AVX2.
// u8.h: using 8 blocks at a time.
// Inspired by https://github.com/floodyberry/supercop/tree/master/crypto_stream/chacha20/dolbeau/amd64-avx2
// DO NOT USE THIS CODE FOR CRYPTOGRAPHIC PURPOSES.
typedef struct prng_state {
uint32_t state[16];
} prng_state;
#define ROUNDS 8
#define U8TO32_LITTLE(p) (((uint32_t*)(p))[0])
// SIMD primitives
#define VEC8_ROT(a,imm) _mm256_or_si256(_mm256_slli_epi32(a,imm),_mm256_srli_epi32(a,(32-imm)))
#define VEC8_LINE1(a,b,c,d) \
x_##a = _mm256_add_epi32(x_##a, x_##b); x_##d = _mm256_shuffle_epi8(_mm256_xor_si256(x_##d, x_##a), rot16)
#define VEC8_LINE2(a,b,c,d) \
x_##c = _mm256_add_epi32(x_##c, x_##d); x_##b = VEC8_ROT(_mm256_xor_si256(x_##b, x_##c), 12)
#define VEC8_LINE3(a,b,c,d) \
x_##a = _mm256_add_epi32(x_##a, x_##b); x_##d = _mm256_shuffle_epi8(_mm256_xor_si256(x_##d, x_##a), rot8)
#define VEC8_LINE4(a,b,c,d) \
x_##c = _mm256_add_epi32(x_##c, x_##d); x_##b = VEC8_ROT(_mm256_xor_si256(x_##b, x_##c), 7)
#define VEC8_ROUND_SEQ(a1,b1,c1,d1,a2,b2,c2,d2,a3,b3,c3,d3,a4,b4,c4,d4) \
VEC8_LINE1(a1,b1,c1,d1); \
VEC8_LINE1(a2,b2,c2,d2); \
VEC8_LINE1(a3,b3,c3,d3); \
VEC8_LINE1(a4,b4,c4,d4); \
VEC8_LINE2(a1,b1,c1,d1); \
VEC8_LINE2(a2,b2,c2,d2); \
VEC8_LINE2(a3,b3,c3,d3); \
VEC8_LINE2(a4,b4,c4,d4); \
VEC8_LINE3(a1,b1,c1,d1); \
VEC8_LINE3(a2,b2,c2,d2); \
VEC8_LINE3(a3,b3,c3,d3); \
VEC8_LINE3(a4,b4,c4,d4); \
VEC8_LINE4(a1,b1,c1,d1); \
VEC8_LINE4(a2,b2,c2,d2); \
VEC8_LINE4(a3,b3,c3,d3); \
VEC8_LINE4(a4,b4,c4,d4)
#define VEC8_ROUND(a1,b1,c1,d1,a2,b2,c2,d2,a3,b3,c3,d3,a4,b4,c4,d4) VEC8_ROUND_SEQ(a1,b1,c1,d1,a2,b2,c2,d2,a3,b3,c3,d3,a4,b4,c4,d4)
#define ONEQUAD_UNPCK(a,b,c,d) \
{ \
x_##a = _mm256_add_epi32(x_##a, orig##a); \
x_##b = _mm256_add_epi32(x_##b, orig##b); \
x_##c = _mm256_add_epi32(x_##c, orig##c); \
x_##d = _mm256_add_epi32(x_##d, orig##d); \
t_##a = _mm256_unpacklo_epi32(x_##a, x_##b); \
t_##b = _mm256_unpacklo_epi32(x_##c, x_##d); \
t_##c = _mm256_unpackhi_epi32(x_##a, x_##b); \
t_##d = _mm256_unpackhi_epi32(x_##c, x_##d); \
x_##a = _mm256_unpacklo_epi64(t_##a, t_##b); \
x_##b = _mm256_unpackhi_epi64(t_##a, t_##b); \
x_##c = _mm256_unpacklo_epi64(t_##c, t_##d); \
x_##d = _mm256_unpackhi_epi64(t_##c, t_##d); \
}
#define ONEOCTO(a,b,c,d,a2,b2,c2,d2) \
{ \
ONEQUAD_UNPCK(a,b,c,d); \
ONEQUAD_UNPCK(a2,b2,c2,d2); \
t_##a = _mm256_permute2x128_si256(x_##a, x_##a2, 0x20); \
t_##a2 = _mm256_permute2x128_si256(x_##a, x_##a2, 0x31); \
t_##b = _mm256_permute2x128_si256(x_##b, x_##b2, 0x20); \
t_##b2 = _mm256_permute2x128_si256(x_##b, x_##b2, 0x31); \
t_##c = _mm256_permute2x128_si256(x_##c, x_##c2, 0x20); \
t_##c2 = _mm256_permute2x128_si256(x_##c, x_##c2, 0x31); \
t_##d = _mm256_permute2x128_si256(x_##d, x_##d2, 0x20); \
t_##d2 = _mm256_permute2x128_si256(x_##d, x_##d2, 0x31); \
_mm256_storeu_si256((__m256i*)(out+ 0), t_##a ); \
_mm256_storeu_si256((__m256i*)(out+ 64), t_##b ); \
_mm256_storeu_si256((__m256i*)(out+128), t_##c ); \
_mm256_storeu_si256((__m256i*)(out+192), t_##d ); \
_mm256_storeu_si256((__m256i*)(out+256), t_##a2); \
_mm256_storeu_si256((__m256i*)(out+320), t_##b2); \
_mm256_storeu_si256((__m256i*)(out+384), t_##c2); \
_mm256_storeu_si256((__m256i*)(out+448), t_##d2); \
}
// buf's size must be a multiple of 512 bytes.
static inline void prng_gen(prng_state *s, uint8_t out[], size_t bytes) {
int i;
if (!bytes || bytes < 512) { return; }
/* constant for shuffling bytes (replacing multiple-of-8 rotates) */
__m256i rot16 = _mm256_set_epi8(13,12,15,14,9,8,11,10,5,4,7,6,1,0,3,2,13,12,15,14,9,8,11,10,5,4,7,6,1,0,3,2);
__m256i rot8 = _mm256_set_epi8(14,13,12,15,10,9,8,11,6,5,4,7,2,1,0,3,14,13,12,15,10,9,8,11,6,5,4,7,2,1,0,3);
uint32_t in12, in13;
__m256i x_0 = _mm256_set1_epi32(s->state[0]);
__m256i x_1 = _mm256_set1_epi32(s->state[1]);
__m256i x_2 = _mm256_set1_epi32(s->state[2]);
__m256i x_3 = _mm256_set1_epi32(s->state[3]);
__m256i x_4 = _mm256_set1_epi32(s->state[4]);
__m256i x_5 = _mm256_set1_epi32(s->state[5]);
__m256i x_6 = _mm256_set1_epi32(s->state[6]);
__m256i x_7 = _mm256_set1_epi32(s->state[7]);
__m256i x_8 = _mm256_set1_epi32(s->state[8]);
__m256i x_9 = _mm256_set1_epi32(s->state[9]);
__m256i x_10 = _mm256_set1_epi32(s->state[10]);
__m256i x_11 = _mm256_set1_epi32(s->state[11]);
__m256i x_12;// = _mm256_set1_epi32(s->state[12]); /* useless */
__m256i x_13;// = _mm256_set1_epi32(s->state[13]); /* useless */
__m256i x_14 = _mm256_set1_epi32(s->state[14]);
__m256i x_15 = _mm256_set1_epi32(s->state[15]);
__m256i orig0 = x_0;
__m256i orig1 = x_1;
__m256i orig2 = x_2;
__m256i orig3 = x_3;
__m256i orig4 = x_4;
__m256i orig5 = x_5;
__m256i orig6 = x_6;
__m256i orig7 = x_7;
__m256i orig8 = x_8;
__m256i orig9 = x_9;
__m256i orig10 = x_10;
__m256i orig11 = x_11;
__m256i orig12;// = x_12; /* useless */
__m256i orig13;// = x_13; /* useless */
__m256i orig14 = x_14;
__m256i orig15 = x_15;
__m256i t_0;
__m256i t_1;
__m256i t_2;
__m256i t_3;
__m256i t_4;
__m256i t_5;
__m256i t_6;
__m256i t_7;
__m256i t_8;
__m256i t_9;
__m256i t_10;
__m256i t_11;
__m256i t_12;
__m256i t_13;
__m256i t_14;
__m256i t_15;
while (bytes >= 512) {
x_0 = orig0;
x_1 = orig1;
x_2 = orig2;
x_3 = orig3;
x_4 = orig4;
x_5 = orig5;
x_6 = orig6;
x_7 = orig7;
x_8 = orig8;
x_9 = orig9;
x_10 = orig10;
x_11 = orig11;
//x_12 = orig12; /* useless */
//x_13 = orig13; /* useless */
x_14 = orig14;
x_15 = orig15;
// Increment the counter.
const __m256i addv12 = _mm256_set_epi64x(3,2,1,0);
const __m256i addv13 = _mm256_set_epi64x(7,6,5,4);
const __m256i permute = _mm256_set_epi32(7,6,3,2,5,4,1,0);
__m256i t12, t13;
in12 = s->state[12];
in13 = s->state[13];
uint64_t in1213 = ((uint64_t)in12) | (((uint64_t)in13) << 32);
x_12 = _mm256_broadcastq_epi64(_mm_cvtsi64_si128(in1213));
x_13 = _mm256_broadcastq_epi64(_mm_cvtsi64_si128(in1213));
t12 = _mm256_add_epi64(addv12, x_12);
t13 = _mm256_add_epi64(addv13, x_13);
x_12 = _mm256_unpacklo_epi32(t12, t13);
x_13 = _mm256_unpackhi_epi32(t12, t13);
t12 = _mm256_unpacklo_epi32(x_12, x_13);
t13 = _mm256_unpackhi_epi32(x_12, x_13);
/* required because unpack* are intra-lane */
x_12 = _mm256_permutevar8x32_epi32(t12, permute);
x_13 = _mm256_permutevar8x32_epi32(t13, permute);
orig12 = x_12;
orig13 = x_13;
in1213 += 8;
s->state[12] = in1213 & 0xFFFFFFFF;
s->state[13] = (in1213>>32)&0xFFFFFFFF;
// Hash the counter.
for (i = 0 ; i < ROUNDS ; i+=2) {
VEC8_ROUND( 0, 4, 8,12, 1, 5, 9,13, 2, 6,10,14, 3, 7,11,15);
VEC8_ROUND( 0, 5,10,15, 1, 6,11,12, 2, 7, 8,13, 3, 4, 9,14);
}
ONEOCTO(0,1,2,3,4,5,6,7);
out+=32;
ONEOCTO(8,9,10,11,12,13,14,15);
out-=32;
bytes -= 512;
out += 512;
// We do whatever remains the normal way.
if (!bytes) return;
}
}
static const char sigma[16] = "expand 32-byte k";
void prng_init(prng_state *s, uint64_t seed[4]) {
// Constant.
s->state[ 0] = U8TO32_LITTLE(sigma + 0);
s->state[ 1] = U8TO32_LITTLE(sigma + 4);
s->state[ 2] = U8TO32_LITTLE(sigma + 8);
s->state[ 3] = U8TO32_LITTLE(sigma + 12);
// Key. I ignore the little-endian details here as they don't affect speed.
s->state[ 4] = seed[0] & 0xffffffff;
s->state[ 5] = seed[0] >> 32;
s->state[ 6] = seed[1] & 0xffffffff;
s->state[ 7] = seed[1] >> 32;
s->state[ 8] = seed[2] & 0xffffffff;
s->state[ 9] = seed[2] >> 32;
s->state[10] = seed[3] & 0xffffffff;
s->state[11] = seed[3] >> 32;
// IV. We don't put an IV. We are not doing crypto here.
s->state[12] = 0;
s->state[13] = 0;
s->state[14] = 0;
s->state[15] = 0;
}
#endif