freebsd-dev/crypto/openssh/verify.c

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2014-01-30 10:56:49 +00:00
/* $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)
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F(15)
F(16)
F(17)
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F(19)
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F(21)
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F(30)
F(31)
return (1 & ((differentbits - 1) >> 8)) - 1;
}