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, tomstdenis@gmail.com, http://libtomcrypt.com
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*/
23int 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 (XMEMCMP(&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: 1.7 $ */
54/* $Date: 2006/11/01 09:28:17 $ */
55