library/utils.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)
 */

#include "mbedtls/utils.h"

#include <stddef.h>

/* 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;
}