mbedtls/library/utils.c
Andres Amaya Garcia b1262a3bdb Allow compile-time alternate to mbedtls_zeroize()
Add a new macro MBEDTLS_UTILS_ZEROIZE that allows users to configure
mbedtls_zeroize() to an alternative definition when defined. If the
macro is not defined, then mbed TLS will use the default definition of
the function.
2018-04-17 09:19:05 -05:00

41 lines
1.2 KiB
C

/*
* mbedtls utility functions
*
* Copyright (C) 2017, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include "mbedtls/utils.h"
#include <stddef.h>
#if !defined(MBEDTLS_UTILS_ZEROIZE_ALT)
/* This implementation should never be optimized out by the compiler */
void mbedtls_zeroize( void *buf, size_t len )
{
volatile unsigned char *p = (unsigned char *)buf;
while( len-- )
*p++ = 0;
}
#endif /* MBEDTLS_UTILS_ZEROIZE_ALT */