65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/**
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* \file platform_util.h
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*
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* \brief Common and shared functions used by multiple modules in the Mbed TLS
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* library.
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*/
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/*
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* Copyright (C) 2018, Arm Limited, All Rights Reserved
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* SPDX-License-Identifier: GPL-2.0
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* This file is part of Mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_PLATFORM_UTIL_H
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#define MBEDTLS_PLATFORM_UTIL_H
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Securely zeroize a buffer
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*
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* The function is meant to wipe the data contained in a buffer so
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* that it can no longer be recovered even if the program memory
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* is later compromised. Call this function on sensitive data
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* stored on the stack before returning from a function, and on
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* sensitive data stored on the heap before freeing the heap
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* object.
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*
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* It is extremely difficult to guarantee that calls to
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* mbedtls_platform_zeroize() are not removed by aggressive
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* compiler optimizations in a portable way. For this reason, Mbed
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* TLS provides the configuration option
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* MBEDTLS_PLATFORM_ZEROIZE_ALT, which allows users to configure
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* mbedtls_platform_zeroize() to use a suitable implementation for
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* their platform and needs
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*
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* \param buf Buffer to be zeroized
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* \param len Length of the buffer in bytes
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*
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*/
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void mbedtls_platform_zeroize( void *buf, size_t len );
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_PLATFORM_UTIL_H */
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