crypto/external/bsd/openssl/lib/libdes/orand_key.c

   1 /*      $NetBSD: orand_key.c,v 1.1 2009/07/19 23:30:58 christos Exp $   */
   2
   3 /*
   4  * Copyright (C) 2003 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include "des_locl.h"
  33
  34 void des_random_seed(des_cblock *key)
  35 {
  36 }
  37
  38 int des_random_key(des_cblock *ret)
  39 {
  40         u_int32_t v;
  41         u_int8_t *p, *ep;
  42
  43         do {
  44                 p = (u_int8_t *)ret;
  45                 ep = (u_int8_t *)(ret + sizeof(*ret));
  46                 while (p + sizeof(v) <= ep) {
  47                         v = arc4random();
  48                         *(u_int32_t *)p = v;
  49                         p += sizeof(v);
  50                 }
  51                 if (ep - p) {
  52                         v = arc4random();
  53                         memcpy(p, &v, ep - p);
  54                 }
  55         } while (des_is_weak_key(ret));
  56         des_set_odd_parity(ret);
  57         return (1);
  58 }