A local copy of OpenSSL from GitHub
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/*
* Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include <openssl/crypto.h>
/*
* Pointer to memset is volatile so that compiler must de-reference
* the pointer and can't assume that it points to any function in
* particular (such as memset, which it then might further "optimize")
*/
typedef void *(*memset_t)(void *,int,size_t);
static volatile memset_t memset_func = memset;
void OPENSSL_cleanse(void *ptr, size_t len)
{
memset_func(ptr, 0, len);
}