text: /* -*- mode:C; c-file-style: "bsd" -*- */
  /*
   * Copyright (c) 2008-2019 Yubico AB
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *
   *     * Redistributions in binary form must reproduce the above
   *       copyright notice, this list of conditions and the following
   *       disclaimer in the documentation and/or other materials provided
   *       with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef	__YKBZERO_H_INCLUDED__
  #define	__YKBZERO_H_INCLUDED__
  
  #ifdef _WIN32
  #include <windows.h>
  #else
  #include <string.h>
  #endif
  
  #ifdef _WIN32
  #define insecure_memzero(buf, len) SecureZeroMemory(buf, len)
  #elif HAVE_MEMSET_S
  #define insecure_memzero(buf, len) memset_s(buf, len, 0, len)
  #elif HAVE_EXPLICIT_BZERO
  #define insecure_memzero(buf, len) explicit_bzero(buf, len)
  #elif HAVE_EXPLICIT_MEMSET
  #define insecure_memzero(buf, len) explicit_memset(buf, 0, len)
  #elif HAVE_INLINE_ASM
  #define insecure_memzero(buf, len) do {                                 \
                  memset(buf, 0, len);                                    \
                  __asm__ __volatile__ ("" : : "r"(buf) : "memory");      \
          } while (0)
  #else
  #define insecure_memzero(buf, len) do {                                 \
                  volatile unsigned char *volatile __buf_ =               \
                          (volatile unsigned char *volatile)buf;          \
                  size_t __i_ = 0;                                        \
                  while (__i_ < len) __buf_[__i_++] = 0;                  \
          } while (0)
  #endif
  
  #endif	/* __YKBZERO_H_INCLUDED__ */
  