From 559fd77ddac907da598202c23f103fc940f15ff8 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Fri, 18 Mar 2016 11:49:26 +0100 Subject: Add timingsafe_bcmp() This function is used by LibreSSL and OpenSSH and is provided by the OpenBSD libc. * libc/include/string.h (timingsafe_bcmp): Declare. * libc/string/timingsafe_bcmp.c: New file. * libc/string/Makefile.am: Add new file. * libc/string/Makefile.in: Regenerate. --- newlib/libc/string/timingsafe_bcmp.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 newlib/libc/string/timingsafe_bcmp.c (limited to 'newlib/libc/string/timingsafe_bcmp.c') diff --git a/newlib/libc/string/timingsafe_bcmp.c b/newlib/libc/string/timingsafe_bcmp.c new file mode 100644 index 000000000..0b736154c --- /dev/null +++ b/newlib/libc/string/timingsafe_bcmp.c @@ -0,0 +1,29 @@ +/* $OpenBSD: timingsafe_bcmp.c,v 1.2 2014/06/10 04:17:37 deraadt Exp $ */ +/* + * Copyright (c) 2010 Damien Miller. All rights reserved. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include + +int +timingsafe_bcmp(const void *b1, const void *b2, size_t n) +{ + const unsigned char *p1 = b1, *p2 = b2; + int ret = 0; + + for (; n > 0; n--) + ret |= *p1++ ^ *p2++; + return (ret != 0); +} -- cgit v1.2.3