44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
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/****************************************************************************
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* libs/libc/string/lib_timingsafe_bcmp.c
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* $OpenBSD: timingsafe_bcmp.c,v 1.3 2015/08/31 02:53:57 guenther Exp $
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*
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* Copyright (c) 2010 Damien Miller. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <string.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int timingsafe_bcmp(FAR const void *b1, FAR const void *b2, size_t n)
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{
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FAR const unsigned char *p1 = b1;
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FAR const unsigned char *p2 = b2;
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int ret = 0;
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for (; n > 0; n--)
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{
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ret |= *p1++ ^ *p2++;
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}
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return (ret != 0);
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}
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