mirror of
https://github.com/taigrr/arduinolibs
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56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015 Southern Storm Software, Pty Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished 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
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* in 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
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* OR 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
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "Crypto.h"
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/**
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* \brief Cleans a block of bytes.
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*
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* \param dest The destination block to be cleaned.
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* \param size The size of the destination to be cleaned in bytes.
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*
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* Unlike memset(), this function attempts to prevent the compiler
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* from optimizing away the clear on a memory buffer.
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*/
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void clean(void *dest, size_t size)
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{
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// Force the use of volatile so that we actually clear the memory.
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// Otherwise the compiler might optimise the entire contents of this
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// function away, which will not be secure.
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volatile uint8_t *d = (volatile uint8_t *)dest;
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while (size > 0) {
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*d++ = 0;
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--size;
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}
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}
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/**
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* \fn void clean(T &var)
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* \brief Template function that cleans a variable.
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*
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* \param var A reference to the variable to clean.
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*
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* The variable will be cleared to all-zeroes in a secure manner.
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* Unlike memset(), this function attempts to prevent the compiler
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* from optimizing away the variable clear.
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*/
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