crypto/mem_clr.c

   1 /*
   2  * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11 #include <openssl/crypto.h>
  12
  13 /*
  14  * Pointer to memset is volatile so that compiler must de-reference
  15  * the pointer and can't assume that it points to any function in
  16  * particular (such as memset, which it then might further "optimize")
  17  */
  18 typedef void *(*memset_t)(void *, int, size_t);
  19
  20 static volatile memset_t memset_func = memset;
  21
  22 void OPENSSL_cleanse(void *ptr, size_t len)
  23 {
  24     memset_func(ptr, 0, len);
  25 }