43 lines
978 B
C
43 lines
978 B
C
/*
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* Copyright (C) 2007-2008 Apple Inc. All rights reserved.
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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#include <string.h>
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#include <sys/types.h>
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int
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memcmp(const void *cs, const void *ct, size_t count)
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{
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const unsigned char *su1, *su2;
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signed char res = 0;
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for(su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
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if((res = *su1 - *su2) != 0)
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break;
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return res;
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}
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/*
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* memcmp_secure
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*
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* memcmp with constant execution time for a given compare length.
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*/
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int
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memcmp_secure(const void *cs, const void *ct, size_t count)
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{
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const unsigned char *su1, *su2;
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unsigned char res = 0;
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for(su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
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res |= *su1 ^ *su2;
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return res ? 1 : 0;
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}
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