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_find_cipher_any.c
15 Find a cipher in the descriptor tables, Tom St Denis
16 */
17
18 /**
19 Find a cipher flexibly. First by name then if not present by block and key size
20 @param name The name of the cipher desired
21 @param blocklen The minimum length of the block cipher desired (octets)
22 @param keylen The minimum length of the key size desired (octets)
23 @return >= 0 if found, -1 if not present
24 */
find_cipher_any(const char * name,int blocklen,int keylen)25 int find_cipher_any(const char *name, int blocklen, int keylen)
26 {
27 int x;
28
29 LTC_ARGCHK(name != NULL);
30
31 x = find_cipher(name);
32 if (x != -1) return x;
33
34 LTC_MUTEX_LOCK(<c_cipher_mutex);
35 for (x = 0; x < TAB_SIZE; x++) {
36 if (cipher_descriptor[x].name == NULL) {
37 continue;
38 }
39 if (blocklen <= (int)cipher_descriptor[x].block_length && keylen <= (int)cipher_descriptor[x].max_key_length) {
40 LTC_MUTEX_UNLOCK(<c_cipher_mutex);
41 return x;
42 }
43 }
44 LTC_MUTEX_UNLOCK(<c_cipher_mutex);
45 return -1;
46 }
47
48 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_find_cipher_any.c,v $ */
49 /* $Revision: 1.5 $ */
50 /* $Date: 2006/03/31 14:15:35 $ */
51