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      1 /*	$NetBSD: rand.c,v 1.3 2019/12/15 22:50:51 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 - 2002 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 #include <config.h>
     36 
     37 #include <krb5/roken.h>
     38 
     39 #ifdef HAVE_WIN32_RAND_S
     40 static int hasRand_s = 1;
     41 #endif
     42 
     43 void ROKEN_LIB_FUNCTION
     44 rk_random_init(void)
     45 {
     46 #if defined(HAVE_ARC4RANDOM)
     47     /* nothing to do */;
     48 #elif defined(HAVE_SRANDOMDEV)
     49     srandomdev();
     50 #elif defined(HAVE_RANDOM)
     51     srandom(time(NULL));
     52 #else
     53 # ifdef HAVE_WIN32_RAND_S
     54     OSVERSIONINFO osInfo;
     55 
     56     osInfo.dwOSVersionInfoSize = sizeof(osInfo);
     57     hasRand_s =
     58 	(GetVersionEx(&osInfo)
     59 	  && ((osInfo.dwMajorVersion > 5) ||
     60 	       (osInfo.dwMajorVersion == 5) && (osInfo.dwMinorVersion >= 1)));
     61 # endif
     62     srand (time(NULL));
     63 #endif
     64 }
     65 
     66 #ifdef HAVE_WIN32_RAND_S
     67 unsigned int ROKEN_LIB_FUNCTION
     68 rk_random(void)
     69 {
     70     if (hasRand_s) {
     71 	unsigned int n;
     72 	int code;
     73 
     74 	code = rand_s(&n);
     75 	if (code == 0)
     76 	    return n;
     77     }
     78 
     79     return rand();
     80 }
     81 #endif
     82