crypto.c 1.44 KB
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/*
crypto.c : functions common to all the crypto backends
Copyright (C) 2017  Belledonne Communications SARL

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <bctoolbox/crypto.h>

/*****************************************************************************/
/***** Cleaning                                                          *****/
/*****************************************************************************/

/**
 * @brief force a buffer value to zero in a way that shall prevent the compiler from optimizing it out
 *
 * @param[in/out]	buffer	the buffer to be cleared
 * @param[in]		size	buffer size
 */
void bctbx_clean(void *buffer, size_t size) {
	//TODO: use memset_s or SecureZeroMemory when available
	volatile uint8_t *p = buffer;
	while(size--) *p++ = 0;
}