freebsd-dev/crypto/openssh/verify.c
2014-01-31 13:12:02 +00:00

50 lines
668 B
C

/* $OpenBSD: verify.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */
/*
* Public Domain, Author: Daniel J. Bernstein
* Copied from nacl-20110221/crypto_verify/32/ref/verify.c
*/
#include "includes.h"
#include "crypto_api.h"
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)
F(7)
F(8)
F(9)
F(10)
F(11)
F(12)
F(13)
F(14)
F(15)
F(16)
F(17)
F(18)
F(19)
F(20)
F(21)
F(22)
F(23)
F(24)
F(25)
F(26)
F(27)
F(28)
F(29)
F(30)
F(31)
return (1 & ((differentbits - 1) >> 8)) - 1;
}