1 // SPDX-License-Identifier: BSD-2-Clause
2 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3  *
4  * LibTomCrypt is a library that provides various cryptographic
5  * algorithms in a highly modular and flexible manner.
6  *
7  * The library is free for all purposes without any express
8  * guarantee it works.
9  */
10 #include "tomcrypt_private.h"
11 
12 /**
13   @file crypt_find_cipher_any.c
14   Find a cipher in the descriptor tables, Tom St Denis
15 */
16 
17 /**
18    Find a cipher flexibly.  First by name then if not present by block and key size
19    @param name        The name of the cipher desired
20    @param blocklen    The minimum length of the block cipher desired (octets)
21    @param keylen      The minimum length of the key size desired (octets)
22    @return >= 0 if found, -1 if not present
23 */
find_cipher_any(const char * name,int blocklen,int keylen)24 int find_cipher_any(const char *name, int blocklen, int keylen)
25 {
26    int x;
27 
28    if(name != NULL) {
29       x = find_cipher(name);
30       if (x != -1) return x;
31    }
32 
33    LTC_MUTEX_LOCK(&ltc_cipher_mutex);
34    for (x = 0; x < TAB_SIZE; x++) {
35        if (cipher_descriptor[x] == NULL) {
36           continue;
37        }
38        if (blocklen <= (int)cipher_descriptor[x]->block_length && keylen <= (int)cipher_descriptor[x]->max_key_length) {
39           LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
40           return x;
41        }
42    }
43    LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
44    return -1;
45 }
46 
47 /* ref:         $Format:%D$ */
48 /* git commit:  $Format:%H$ */
49 /* commit time: $Format:%ai$ */
50