Line data    Source code

       1             : /*      $OpenBSD: timingsafe_bcmp.c,v 1.2 2014/06/10 04:16:57 deraadt Exp $     */
       2             : /*
       3             :  * Copyright (c) 2010 Damien Miller.  All rights reserved.
       4             :  *
       5             :  * Permission to use, copy, modify, and distribute this software for any
       6             :  * purpose with or without fee is hereby granted, provided that the above
       7             :  * copyright notice and this permission notice appear in all copies.
       8             :  *
       9             :  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      10             :  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      11             :  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      12             :  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      13             :  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      14             :  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      15             :  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      16             :  */
      17             : 
      18             : #include <lib/libkern/libkern.h>
      19             : 
      20             : int
      21           0 : timingsafe_bcmp(const void *b1, const void *b2, size_t n)
      22             : {
      23             :         const unsigned char *p1 = b1, *p2 = b2;
      24             :         int ret = 0;
      25             : 
      26           0 :         for (; n > 0; n--)
      27           0 :                 ret |= *p1++ ^ *p2++;
      28           0 :         return (ret != 0);
      29             : }