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comparison src/misc/crypt/crypt_register_prng.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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143:5d99163f7e32 191:1c15b283127b
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 for (x = 0; x < TAB_SIZE; x++) {
31 if (memcmp(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor)) == 0) {
32 return x;
33 }
34 }
35
36 /* find a blank spot */
37 for (x = 0; x < TAB_SIZE; x++) {
38 if (prng_descriptor[x].name == NULL) {
39 XMEMCPY(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor));
40 return x;
41 }
42 }
43
44 /* no spot */
45 return -1;
46 }