44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/****************************************************************************
|
|
* libs/libc/string/lib_timingsafe_bcmp.c
|
|
* $OpenBSD: timingsafe_bcmp.c,v 1.3 2015/08/31 02:53:57 guenther 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <string.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
int timingsafe_bcmp(FAR const void *b1, FAR const void *b2, size_t n)
|
|
{
|
|
FAR const unsigned char *p1 = b1;
|
|
FAR const unsigned char *p2 = b2;
|
|
int ret = 0;
|
|
|
|
for (; n > 0; n--)
|
|
{
|
|
ret |= *p1++ ^ *p2++;
|
|
}
|
|
|
|
return (ret != 0);
|
|
}
|