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comparison src/misc/crypt/crypt_register_prng.c @ 280:59400faa4b44 libtomcrypt-orig libtomcrypt-1.05

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Re-import libtomcrypt 1.05 for cleaner propagating. From crypt-1.05.tar.bz2, SHA1 of 88250202bb51570dc64f7e8f1c943cda9479258f
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 12:58:00 +0000
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children d5faf4814ddb
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-1:000000000000 280:59400faa4b44
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file crypt_register_prng.c
15 Register a PRNG, Tom St Denis
16 */
17
18 /**
19 Register a PRNG with the descriptor table
20 @param prng The PRNG you wish to register
21 @return value >= 0 if successfully added (or already present), -1 if unsuccessful
22 */
23 int register_prng(const struct ltc_prng_descriptor *prng)
24 {
25 int x;
26
27 LTC_ARGCHK(prng != NULL);
28
29 /* is it already registered? */
30 LTC_MUTEX_LOCK(&ltc_prng_mutex);
31 for (x = 0; x < TAB_SIZE; x++) {
32 if (memcmp(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor)) == 0) {
33 LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
34 return x;
35 }
36 }
37
38 /* find a blank spot */
39 for (x = 0; x < TAB_SIZE; x++) {
40 if (prng_descriptor[x].name == NULL) {
41 XMEMCPY(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor));
42 LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
43 return x;
44 }
45 }
46
47 /* no spot */
48 LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
49 return -1;
50 }
51
52 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_register_prng.c,v $ */
53 /* $Revision: 1.5 $ */
54 /* $Date: 2005/06/19 18:00:28 $ */