mirror of
https://github.com/henrydcase/pqc.git
synced 2024-11-27 01:41:40 +00:00
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
#include "crypto_verify_1039.h"
|
|
#include <immintrin.h>
|
|
|
|
int PQCLEAN_SNTRUP761_AVX2_crypto_verify_1039(const unsigned char *x, const unsigned char *y) {
|
|
__m256i diff = _mm256_set1_epi8(0);
|
|
unsigned int differentbits = 0;
|
|
int i = PQCLEAN_SNTRUP761_AVX2_crypto_verify_1039_BYTES;
|
|
|
|
i -= 32;
|
|
for (;;) {
|
|
do {
|
|
__m256i x0 = _mm256_loadu_si256((__m256i *) x);
|
|
__m256i y0 = _mm256_loadu_si256((__m256i *) y);
|
|
diff |= x0 ^ y0;
|
|
i -= 32;
|
|
x += 32;
|
|
y += 32;
|
|
} while (i >= 0);
|
|
if (i <= -32) {
|
|
break;
|
|
}
|
|
x += i;
|
|
y += i;
|
|
}
|
|
|
|
diff |= _mm256_srli_epi16(diff, 8);
|
|
diff |= _mm256_srli_epi32(diff, 16);
|
|
diff |= _mm256_srli_epi64(diff, 32);
|
|
|
|
differentbits = (unsigned int) _mm256_extract_epi8(diff, 0);
|
|
differentbits |= (unsigned int) _mm256_extract_epi8(diff, 8);
|
|
differentbits |= (unsigned int) _mm256_extract_epi8(diff, 16);
|
|
differentbits |= (unsigned int) _mm256_extract_epi8(diff, 24);
|
|
|
|
return (int) (1 & ((differentbits - 1) >> 8)) - 1;
|
|
}
|