1bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* $OpenBSD: timingsafe_bcmp.c,v 1.1 2010/09/24 13:33:00 matthew Exp $ */ 2bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* 3bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Copyright (c) 2010 Damien Miller. All rights reserved. 4bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * 5bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Permission to use, copy, modify, and distribute this software for any 6bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * purpose with or without fee is hereby granted, provided that the above 7bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * copyright notice and this permission notice appear in all copies. 8bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * 9bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 17bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 18bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* OPENBSD ORIGINAL: lib/libc/string/timingsafe_bcmp.c */ 19bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 20bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "includes.h" 21bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#ifndef HAVE_TIMINGSAFE_BCMP 22bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 23bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanint 24bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmantimingsafe_bcmp(const void *b1, const void *b2, size_t n) 25bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 26bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman const unsigned char *p1 = b1, *p2 = b2; 27bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman int ret = 0; 28bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 29bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman for (; n > 0; n--) 30bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman ret |= *p1++ ^ *p2++; 31bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return (ret != 0); 32bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 33bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 34bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#endif /* TIMINGSAFE_BCMP */ 35