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   1 /**
   2  * \file platform_util.h
   3  *
   4  * \brief Common and shared functions used by multiple modules in the Mbed TLS
   5  *        library.
   6  */
   7 /*
   8  *  Copyright (C) 2018, Arm Limited, All Rights Reserved
   9  *  SPDX-License-Identifier: GPL-2.0
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  *
  25  *  This file is part of Mbed TLS (https://tls.mbed.org)
  26  */
  27 #ifndef MBEDTLS_PLATFORM_UTIL_H
  28 #define MBEDTLS_PLATFORM_UTIL_H
  29
  30 #include <stddef.h>
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 /**
  37  * \brief       Securely zeroize a buffer
  38  *
  39  *              The function is meant to wipe the data contained in a buffer so
  40  *              that it can no longer be recovered even if the program memory
  41  *              is later compromised. Call this function on sensitive data
  42  *              stored on the stack before returning from a function, and on
  43  *              sensitive data stored on the heap before freeing the heap
  44  *              object.
  45  *
  46  *              It is extremely difficult to guarantee that calls to
  47  *              mbedtls_platform_zeroize() are not removed by aggressive
  48  *              compiler optimizations in a portable way. For this reason, Mbed
  49  *              TLS provides the configuration option
  50  *              MBEDTLS_PLATFORM_ZEROIZE_ALT, which allows users to configure
  51  *              mbedtls_platform_zeroize() to use a suitable implementation for
  52  *              their platform and needs
  53  *
  54  * \param buf   Buffer to be zeroized
  55  * \param len   Length of the buffer in bytes
  56  *
  57  */
  58 void mbedtls_platform_zeroize( void *buf, size_t len );
  59
  60 #ifdef __cplusplus
  61 }
  62 #endif
  63
  64 #endif /* MBEDTLS_PLATFORM_UTIL_H */