verify.c revision 262566 
1/* $OpenBSD: verify.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */
2
3/*
4 * Public Domain, Author: Daniel J. Bernstein
5 * Copied from nacl-20110221/crypto_verify/32/ref/verify.c
6 */
7
8#include "includes.h"
9
10#include "crypto_api.h"
11
12int crypto_verify_32(const unsigned char *x,const unsigned char *y)
13{
14  unsigned int differentbits = 0;
15#define F(i) differentbits |= x[i] ^ y[i];
16  F(0)
17  F(1)
18  F(2)
19  F(3)
20  F(4)
21  F(5)
22  F(6)
23  F(7)
24  F(8)
25  F(9)
26  F(10)
27  F(11)
28  F(12)
29  F(13)
30  F(14)
31  F(15)
32  F(16)
33  F(17)
34  F(18)
35  F(19)
36  F(20)
37  F(21)
38  F(22)
39  F(23)
40  F(24)
41  F(25)
42  F(26)
43  F(27)
44  F(28)
45  F(29)
46  F(30)
47  F(31)
48  return (1 & ((differentbits - 1) >> 8)) - 1;
49}
50