1 /* $NetBSD: rand.c,v 1.3 2019/12/15 22:50:51 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
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
rk_random_init(void)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
rk_random(void)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