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Slightly faster verify_{16,32,64}

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This commit is contained in:
Frank Denis
2015-11-25 12:19:17 +01:00
parent d5fd75dcc7
commit 65fbe15fa3
3 changed files with 72 additions and 124 deletions
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src/libsodium/crypto_verify/16/ref/verify_16.c
+24 -20
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@@ -1,24 +1,28 @@
#include <stddef.h>
#include <stdint.h>
#include "crypto_verify_16.h"
int crypto_verify_16(const unsigned char *x,const unsigned char *y)
int
crypto_verify_16(const unsigned char *x, const unsigned char *y)
{
unsigned int differentbits = 0;
#define F(i) differentbits |= x[i] ^ y[i];
F(0)
F(1)
F(2)
F(3)
F(4)
F(5)
F(6)
F(7)
F(8)
F(9)
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F(12)
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return (1 & ((differentbits - 1) >> 8)) - 1;
#ifdef CPU_UNALIGNED_ACCESS
uint_fast64_t d = 0U;
int i;
for (i = 0; i < 16; i += 4) {
d |= *((const uint32_t *) (const void *) &x[i]) ^
*((const uint32_t *) (const void *) &y[i]);
}
return (1 & ((d - 1) >> 32)) - 1;
#else
uint_fast16_t d = 0U;
int i;
for (i = 0; i < 16; i++) {
d |= x[i] ^ y[i];
}
return (1 & ((d - 1) >> 8)) - 1;
#endif
}
src/libsodium/crypto_verify/32/ref/verify_32.c
+24 -36
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@@ -1,40 +1,28 @@
#include <stddef.h>
#include <stdint.h>
#include "crypto_verify_32.h"
int crypto_verify_32(const unsigned char *x,const unsigned char *y)
int
crypto_verify_32(const unsigned char *x, const unsigned char *y)
{
unsigned int differentbits = 0;
#define F(i) differentbits |= x[i] ^ y[i];
F(0)
F(1)
F(2)
F(3)
F(4)
F(5)
F(6)
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F(8)
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return (1 & ((differentbits - 1) >> 8)) - 1;
#ifdef CPU_UNALIGNED_ACCESS
uint_fast64_t d = 0U;
int i;
for (i = 0; i < 32; i += 4) {
d |= *((const uint32_t *) (const void *) &x[i]) ^
*((const uint32_t *) (const void *) &y[i]);
}
return (1 & ((d - 1) >> 32)) - 1;
#else
uint_fast16_t d = 0U;
int i;
for (i = 0; i < 32; i++) {
d |= x[i] ^ y[i];
}
return (1 & ((d - 1) >> 8)) - 1;
#endif
}
src/libsodium/crypto_verify/64/ref/verify_64.c
+24 -68
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@@ -1,72 +1,28 @@
#include <stddef.h>
#include <stdint.h>
#include "crypto_verify_64.h"
int crypto_verify_64(const unsigned char *x,const unsigned char *y)
int
crypto_verify_64(const unsigned char *x, const unsigned char *y)
{
unsigned int differentbits = 0;
#define F(i) differentbits |= x[i] ^ y[i];
F(0)
F(1)
F(2)
F(3)
F(4)
F(5)
F(6)
F(7)
F(8)
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return (1 & ((differentbits - 1) >> 8)) - 1;
#ifdef CPU_UNALIGNED_ACCESS
uint_fast64_t d = 0U;
int i;
for (i = 0; i < 64; i += 4) {
d |= *((const uint32_t *) (const void *) &x[i]) ^
*((const uint32_t *) (const void *) &y[i]);
}
return (1 & ((d - 1) >> 32)) - 1;
#else
uint_fast16_t d = 0U;
int i;
for (i = 0; i < 64; i++) {
d |= x[i] ^ y[i];
}
return (1 & ((d - 1) >> 8)) - 1;
#endif
}