70543bba37
Exported from SUPERCOP-20200826 using the scripts at: https://github.com/jschanck/pqclean-package-ntruprime
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
#include "crypto_encode_653x3.h"
|
|
#include <immintrin.h>
|
|
#define uint8 uint8_t
|
|
|
|
#define p 653
|
|
#define loops 6
|
|
#define overshoot 29
|
|
|
|
static const union {
|
|
uint8 init[32];
|
|
__m256i val;
|
|
} lobytes_buf = { .init = {
|
|
255, 0, 255, 0, 255, 0, 255, 0,
|
|
255, 0, 255, 0, 255, 0, 255, 0,
|
|
255, 0, 255, 0, 255, 0, 255, 0,
|
|
255, 0, 255, 0, 255, 0, 255, 0,
|
|
}
|
|
};
|
|
#define lobytes (lobytes_buf.val)
|
|
|
|
void PQCLEAN_NTRULPR653_AVX2_crypto_encode_653x3(unsigned char *s, const void *v) {
|
|
const uint8 *f = v;
|
|
int loop;
|
|
const uint8 *nextf = f + 128 - 4 * overshoot;
|
|
unsigned char *nexts = s + 32 - overshoot;
|
|
|
|
for (loop = loops; loop > 0; --loop) {
|
|
__m256i f0 = _mm256_loadu_si256((const __m256i *) (f + 0));
|
|
__m256i f1 = _mm256_loadu_si256((const __m256i *) (f + 32));
|
|
__m256i f2 = _mm256_loadu_si256((const __m256i *) (f + 64));
|
|
__m256i f3 = _mm256_loadu_si256((const __m256i *) (f + 96));
|
|
f = nextf;
|
|
nextf += 128;
|
|
|
|
__m256i a0 = _mm256_packus_epi16(f0 & lobytes, f1 & lobytes);
|
|
/* 0 2 4 6 8 10 12 14 32 34 36 38 40 42 44 46 */
|
|
/* 16 18 20 22 24 26 28 30 48 50 52 54 56 58 60 62 */
|
|
__m256i a1 = _mm256_packus_epi16(_mm256_srli_epi16(f0, 8), _mm256_srli_epi16(f1, 8));
|
|
/* 1 3 ... */
|
|
__m256i a2 = _mm256_packus_epi16(f2 & lobytes, f3 & lobytes);
|
|
__m256i a3 = _mm256_packus_epi16(_mm256_srli_epi16(f2, 8), _mm256_srli_epi16(f3, 8));
|
|
|
|
a0 = _mm256_add_epi8(a0, _mm256_slli_epi16(a1 & _mm256_set1_epi8(63), 2));
|
|
a2 = _mm256_add_epi8(a2, _mm256_slli_epi16(a3 & _mm256_set1_epi8(63), 2));
|
|
|
|
__m256i b0 = _mm256_packus_epi16(a0 & lobytes, a2 & lobytes);
|
|
/* 0 4 8 12 32 36 40 44 64 68 72 76 96 100 104 108 */
|
|
/* 16 20 24 28 48 52 56 60 80 84 88 92 112 116 120 124 */
|
|
__m256i b2 = _mm256_packus_epi16(_mm256_srli_epi16(a0, 8), _mm256_srli_epi16(a2, 8));
|
|
/* 2 6 ... */
|
|
|
|
b0 = _mm256_add_epi8(b0, _mm256_slli_epi16(b2 & _mm256_set1_epi8(15), 4));
|
|
|
|
b0 = _mm256_permutevar8x32_epi32(b0, _mm256_set_epi32(7, 3, 6, 2, 5, 1, 4, 0));
|
|
|
|
b0 = _mm256_add_epi8(b0, _mm256_set1_epi8(85));
|
|
|
|
_mm256_storeu_si256((__m256i *) s, b0);
|
|
s = nexts;
|
|
nexts += 32;
|
|
}
|
|
|
|
*s++ = *f++ + 1;
|
|
}
|