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comparison libtomcrypt/src/misc/crypt/crypt_find_cipher_any.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_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 */
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(&ltc_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(&ltc_cipher_mutex);
41 return x;
42 }
43 }
44 LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
45 return -1;
46 }
47
48 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_find_cipher_any.c,v $ */
49 /* $Revision: 1.4 $ */
50 /* $Date: 2005/06/19 18:00:28 $ */