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99 lines
2.2 KiB
99 lines
2.2 KiB
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#include <stddef.h>
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#include <stdint.h>
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#include "crypto_verify_16.h"
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#include "crypto_verify_32.h"
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#include "crypto_verify_64.h"
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size_t
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crypto_verify_16_bytes(void)
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{
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return crypto_verify_16_BYTES;
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}
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size_t
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crypto_verify_32_bytes(void)
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{
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return crypto_verify_32_BYTES;
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}
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size_t
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crypto_verify_64_bytes(void)
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{
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return crypto_verify_64_BYTES;
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}
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#if defined(HAVE_EMMINTRIN_H) && defined(__SSE2__)
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# ifdef __GNUC__
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# pragma GCC target("sse2")
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# endif
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# include <emmintrin.h>
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static inline int
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crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
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const int n)
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{
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const __m128i zero = _mm_setzero_si128();
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volatile __m128i v1, v2, z;
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volatile int m;
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int i;
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const volatile __m128i *volatile x =
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(const volatile __m128i *volatile) (const void *) x_;
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const volatile __m128i *volatile y =
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(const volatile __m128i *volatile) (const void *) y_;
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v1 = _mm_loadu_si128((const __m128i *) &x[0]);
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v2 = _mm_loadu_si128((const __m128i *) &y[0]);
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z = _mm_xor_si128(v1, v2);
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for (i = 1; i < n / 16; i++) {
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v1 = _mm_loadu_si128((const __m128i *) &x[i]);
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v2 = _mm_loadu_si128((const __m128i *) &y[i]);
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z = _mm_or_si128(z, _mm_xor_si128(v1, v2));
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}
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m = _mm_movemask_epi8(_mm_cmpeq_epi32(z, zero));
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v1 = zero; v2 = zero; z = zero;
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return (int) (((uint32_t) m + 1U) >> 16) - 1;
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}
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#else
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static inline int
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crypto_verify_n(const unsigned char *x_, const unsigned char *y_,
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const int n)
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{
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const volatile unsigned char *volatile x =
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(const volatile unsigned char *volatile) x_;
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const volatile unsigned char *volatile y =
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(const volatile unsigned char *volatile) y_;
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volatile uint_fast16_t d = 0U;
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int i;
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for (i = 0; i < n; i++) {
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d |= x[i] ^ y[i];
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}
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return (1 & ((d - 1) >> 8)) - 1;
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}
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#endif
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int
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crypto_verify_16(const unsigned char *x, const unsigned char *y)
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{
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return crypto_verify_n(x, y, crypto_verify_16_BYTES);
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}
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int
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crypto_verify_32(const unsigned char *x, const unsigned char *y)
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{
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return crypto_verify_n(x, y, crypto_verify_32_BYTES);
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}
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int
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crypto_verify_64(const unsigned char *x, const unsigned char *y)
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{
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return crypto_verify_n(x, y, crypto_verify_64_BYTES);
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}
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