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416ed5a7 | 1 | /* |
2 | * Copyright (c) 1999-2000 Damien Miller. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * 3. All advertising materials mentioning features or use of this software | |
13 | * must display the following acknowledgement: | |
14 | * This product includes software developed by Markus Friedl. | |
15 | * 4. The name of the author may not be used to endorse or promote products | |
16 | * derived from this software without specific prior written permission. | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #include "includes.h" | |
31 | #include <openssl/rand.h> | |
32 | #include <openssl/rc4.h> | |
33 | ||
34 | #ifndef HAVE_ARC4RANDOM | |
35 | ||
36 | static int rc4_ready = 0; | |
37 | static RC4_KEY rc4; | |
38 | ||
39 | unsigned int arc4random(void) | |
40 | { | |
41 | unsigned int r = 0; | |
42 | ||
43 | if (!rc4_ready) | |
44 | arc4random_stir(); | |
45 | ||
46 | RC4(&rc4, sizeof(r), (unsigned char *)&r, (unsigned char *)&r); | |
47 | ||
48 | return(r); | |
49 | } | |
50 | ||
51 | void arc4random_stir(void) | |
52 | { | |
53 | unsigned char rand_buf[32]; | |
54 | ||
55 | memset(&rc4, 0, sizeof(rc4)); | |
56 | ||
57 | seed_rng(); | |
58 | RAND_bytes(rand_buf, sizeof(rand_buf)); | |
59 | ||
60 | RC4_set_key(&rc4, sizeof(rand_buf), rand_buf); | |
61 | ||
62 | memset(rand_buf, 0, sizeof(rand_buf)); | |
63 | } | |
64 | #endif /* !HAVE_ARC4RANDOM */ |