Initial commit of OpenSPARC T2 design and verification files.

[OpenSPARC-T2-DV] / verif / env / common / vera / niu_ippktgen / C / libnet / src / libnet_prand.c

/*
*  $Id: libnet_prand.c,v 1.21 2005/11/29 21:54:46 carlosc Exp $
*
*  libnet
*  libnet_prand.c - pseudo-random number generation
*
*  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
*  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/

#if (HAVE_CONFIG_H)
#include "../include/config.h"
#endif
#if (!(_WIN32) || (__CYGWIN__)) 
#include "../include/libnet.h"
#else
#include "../include/win32/libnet.h"
#endif
int
libnet_seed_prand(libnet_t *l)
{
       #if !(__WIN32__)
   struct timeval seed;
       #endif

   if (l == NULL)
   { 
       return (-1);
   } 

       #if __WIN32__
   srand((unsigned)time(NULL));
       #else
   if (gettimeofday(&seed, NULL) == -1)
   {
       snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
               "%s(): cannot gettimeofday\n", __func__);
       return (-1);
   }

   /*
    *  More entropy then just seeding with time(2).
    */
   srandom((unsigned)(seed.tv_sec ^ seed.tv_usec));
       #endif
   return (1);
}


u_int32_t
libnet_get_prand(int mod)
{
   u_int32_t n;  /* 0 to 4,294,967,295 */
#ifndef _WIN32
   n = random();
#else
       HCRYPTPROV hProv = 0;
       CryptAcquireContext(&hProv, 
               0, 0, PROV_RSA_FULL, 
               CRYPT_VERIFYCONTEXT);
       
       CryptGenRandom(hProv, 
               sizeof(n), (BYTE*)&n);
       CryptReleaseContext(hProv, 0); 
#endif
   switch (mod)
   {
       case LIBNET_PR2:
           return (n % 0x2);           /* 0 - 1 */
       case LIBNET_PR8:
           return (n % 0xff);          /* 0 - 255 */
       case LIBNET_PR16:
           return (n % 0x7fff);        /* 0 - 32767 */
       case LIBNET_PRu16:
           return (n % 0xffff);        /* 0 - 65535 */
       case LIBNET_PR32:
           return (n % 0x7fffffff);    /* 0 - 2147483647 */
       case LIBNET_PRu32:
           return (n);                 /* 0 - 4294967295 */
   }
   return (0);                         /* NOTTREACHED */
}

/* EOF */