diff options
Diffstat (limited to 'bsd-arc4random.c')
-rw-r--r-- | bsd-arc4random.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/bsd-arc4random.c b/bsd-arc4random.c new file mode 100644 index 000000000..d01a515b4 --- /dev/null +++ b/bsd-arc4random.c | |||
@@ -0,0 +1,64 @@ | |||
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 */ | ||