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File: [cvs.NetBSD.org] / src / common / lib / libc / string / consttime_memequal.c (download)

Revision 1.3, Wed Aug 28 17:47:07 2013 UTC (3 years, 10 months ago) by riastradh
Branch: MAIN
Changes since 1.2: +5 -2 lines

Publish explicit_memset and consttime_memequal in userland libc.

Remove the double-underscore from the userland versions, and do the
weak alias dance instead, now that these are public parts of libc.

As discussed on tech-userlevel:

https://mail-index.netbsd.org/tech-userlevel/2013/06/24/msg007843.html
(option 3)

/* $NetBSD: consttime_memequal.c,v 1.3 2013/08/28 17:47:07 riastradh Exp $ */

#if !defined(_KERNEL) && !defined(_STANDALONE)
#include "namespace.h"
#include <string.h>
#ifdef __weak_alias
__weak_alias(consttime_memequal,_consttime_memequal)
#endif
#else
#include <lib/libkern/libkern.h>
#endif

int
consttime_memequal(const void *b1, const void *b2, size_t len)
{
	const char *c1 = b1, *c2 = b2;
	int res = 0;

	while (len --)
		res |= *c1++ ^ *c2++;
	return !res;
}