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