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/* $OpenBSD: timingsafe_bcmp.c,v 1.1 2010/09/24 13:33:00 matthew 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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#if !defined(_KERNEL) && !defined(_STANDALONE) |
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#include <string.h> |
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#else |
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#include <lib/libkern/libkern.h> |
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#endif |
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int |
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timingsafe_bcmp(const void *b1, const void *b2, size_t n) |
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{ |
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const unsigned char *p1 = b1, *p2 = b2; |
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int ret = 0; |
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for (; n > 0; n--) |
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ret |= *p1++ ^ *p2++; |
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return (ret != 0); |
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} |