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57 lines
2.4 KiB
C
57 lines
2.4 KiB
C
/**
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******************************************************************************
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* @file SecurityUtils.C
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* @author William Xu
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* @version V1.0.0
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* @date 05-May-2014
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* @brief This header contains function that aid in security on the platform.
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******************************************************************************
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*
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* The MIT License
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* Copyright (c) 2014 MXCHIP Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is furnished
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* to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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* IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************************
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*/
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#include "SecurityUtils.h"
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//===========================================================================================================================
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// memcmp_constant_time
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//
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// Compares memory so that the time it takes does not depend on the data being compared.
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// This is needed to avoid certain timing attacks in cryptographic software.
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//===========================================================================================================================
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int memcmp_constant_time( const void *inA, const void *inB, size_t inLen )
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{
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const uint8_t * const a = (const uint8_t *) inA;
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const uint8_t * const b = (const uint8_t *) inB;
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int result = 0;
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size_t i;
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for( i = 0; i < inLen; ++i )
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{
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result |= ( a[ i ] ^ b[ i ] );
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}
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return( result );
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}
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