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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_cipher.c
15   Register a cipher, Tom St Denis
16 */
17 
18 /**
19    Register a cipher with the descriptor table
20    @param cipher   The cipher you wish to register
21    @return value >= 0 if successfully added (or already present), -1 if unsuccessful
22 */
register_cipher(const struct ltc_cipher_descriptor * cipher)23 int register_cipher(const struct ltc_cipher_descriptor *cipher)
24 {
25    int x;
26 
27    LTC_ARGCHK(cipher != NULL);
28 
29    /* is it already registered? */
30    LTC_MUTEX_LOCK(&ltc_cipher_mutex);
31    for (x = 0; x < TAB_SIZE; x++) {
32        if (cipher_descriptor[x].name != NULL && cipher_descriptor[x].ID == cipher->ID) {
33           LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
34           return x;
35        }
36    }
37 
38    /* find a blank spot */
39    for (x = 0; x < TAB_SIZE; x++) {
40        if (cipher_descriptor[x].name == NULL) {
41           XMEMCPY(&cipher_descriptor[x], cipher, sizeof(struct ltc_cipher_descriptor));
42           LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
43           return x;
44        }
45    }
46 
47    /* no spot */
48    LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
49    return -1;
50 }
51 
52 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_register_cipher.c,v $ */
53 /* $Revision: 1.5 $ */
54 /* $Date: 2006/03/31 14:15:35 $ */
55