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mem_clr.c 773 B

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  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. #include <string.h>
  10. #include <openssl/crypto.h>
  11. /*
  12. * Pointer to memset is volatile so that compiler must de-reference
  13. * the pointer and can't assume that it points to any function in
  14. * particular (such as memset, which it then might further "optimize")
  15. */
  16. typedef void *(*memset_t)(void *, int, size_t);
  17. static volatile memset_t memset_func = memset;
  18. void OPENSSL_cleanse(void *ptr, size_t len)
  19. {
  20. memset_func(ptr, 0, len);
  21. }