prng.c

来自「支持SSL v2/v3, TLS, PKCS #5, PKCS #7, PKCS」· C语言 代码 · 共 83 行

/*
 *  prng.c
 *
 *  Command-line pseudo-random number generator
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is the MPI Arbitrary Precision Integer Arithmetic
 * library.
 *
 * The Initial Developer of the Original Code is Michael J. Fromberger.
 * Portions created by Michael J. Fromberger are 
 * Copyright (C) 1998, 1999, 2000 Michael J. Fromberger. 
 * All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable
 * instead of those above.  If you wish to allow use of your
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the GPL.
 *
 *  $Id: prng.c,v 1.1 2000/07/14 00:45:01 nelsonb%netscape.com Exp $
 */

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <time.h>

#include <unistd.h>

#include "bbs_rand.h"

int main(int argc, char *argv[])
{
  unsigned char *seed;
  unsigned int   ix, num = 1;
  pid_t          pid;
  
  if(argc > 1) {
    num = atoi(argv[1]);
    if(num <= 0) 
      num = 1;
  }

  pid = getpid();
  srand(time(NULL) * (unsigned int)pid);

  /* Not a perfect seed, but not bad */
  seed = malloc(bbs_seed_size);
  for(ix = 0; ix < bbs_seed_size; ix++) {
    seed[ix] = rand() % UCHAR_MAX;
  }

  bbs_srand(seed, bbs_seed_size);
  memset(seed, 0, bbs_seed_size);
  free(seed);

  while(num-- > 0) {
    ix = bbs_rand();

    printf("%u\n", ix);
  }

  return 0;

}