37 lines
1.0 KiB
C
37 lines
1.0 KiB
C
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#include "crypto_verify_897.h"
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#include <immintrin.h>
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int PQCLEAN_SNTRUP653_AVX2_crypto_verify_897(const unsigned char *x, const unsigned char *y) {
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__m256i diff = _mm256_set1_epi8(0);
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unsigned int differentbits = 0;
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int i = PQCLEAN_SNTRUP653_AVX2_crypto_verify_897_BYTES;
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i -= 32;
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for (;;) {
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do {
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__m256i x0 = _mm256_loadu_si256((__m256i *) x);
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__m256i y0 = _mm256_loadu_si256((__m256i *) y);
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diff |= x0 ^ y0;
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i -= 32;
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x += 32;
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y += 32;
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} while (i >= 0);
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if (i <= -32) {
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break;
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}
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x += i;
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y += i;
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}
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diff |= _mm256_srli_epi16(diff, 8);
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diff |= _mm256_srli_epi32(diff, 16);
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diff |= _mm256_srli_epi64(diff, 32);
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differentbits = _mm256_extract_epi8(diff, 0);
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differentbits |= _mm256_extract_epi8(diff, 8);
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differentbits |= _mm256_extract_epi8(diff, 16);
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differentbits |= _mm256_extract_epi8(diff, 24);
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return (int) (1 & ((differentbits - 1) >> 8)) - 1;
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}
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