Line data    Source code

       1              : /*
       2              :  * src/port/timingsafe_bcmp.c
       3              :  *
       4              :  *  $OpenBSD: timingsafe_bcmp.c,v 1.3 2015/08/31 02:53:57 guenther Exp $
       5              :  */
       6              : 
       7              : /*
       8              :  * Copyright (c) 2010 Damien Miller.  All rights reserved.
       9              :  *
      10              :  * Permission to use, copy, modify, and distribute this software for any
      11              :  * purpose with or without fee is hereby granted, provided that the above
      12              :  * copyright notice and this permission notice appear in all copies.
      13              :  *
      14              :  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      15              :  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      16              :  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      17              :  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      18              :  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      19              :  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      20              :  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      21              :  */
      22              : 
      23              : #include "c.h"
      24              : 
      25              : #ifdef USE_SSL
      26              : #include <openssl/crypto.h>
      27              : #endif
      28              : 
      29              : int
      30           15 : timingsafe_bcmp(const void *b1, const void *b2, size_t n)
      31              : {
      32              : #ifdef USE_SSL
      33           15 :     return CRYPTO_memcmp(b1, b2, n);
      34              : #else
      35              :     const unsigned char *p1 = b1,
      36              :                *p2 = b2;
      37              :     int         ret = 0;
      38              : 
      39              :     for (; n > 0; n--)
      40              :         ret |= *p1++ ^ *p2++;
      41              :     return (ret != 0);
      42              : #endif
      43              : }