Home | History | Annotate | Download | only in crypt 
      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 (at) 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 */
     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: 1.5 $ */
     50 /* $Date: 2006/03/31 14:15:35 $ */
     51