/*

 * src/port/timingsafe_bcmp.c

 *

 *  $OpenBSD: timingsafe_bcmp.c,v 1.3 2015/08/31 02:53:57 guenther Exp $

 */

/*

 * Copyright (c) 2010 Damien Miller.  All rights reserved.

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

#include "c.h"

#ifdef USE_SSL

#include <openssl/crypto.h>

#endif

int

timingsafe_bcmp(const void *b1, const void *b2, size_t n)

{

#ifdef USE_SSL

  return CRYPTO_memcmp(b1, b2, n);

#else

  const unsigned char *p1 = b1,

         *p2 = b2;

  int     ret = 0;

  for (; n > 0; n--)

    ret |= *p1++ ^ *p2++;

  return (ret != 0);

#endif

}