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comparison libtomcrypt/src/misc/crypt/crypt_register_prng.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
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children 0cbe8f6dbf9e
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281:997e6f7dc01e 285:1b9e69c058d2
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 $ */