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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 (at) gmail.com, http://libtomcrypt.com
     10  */
     11 #include "tomcrypt.h"
     12 
     13 /**
     14   @file crypt_find_hash_any.c
     15   Find a hash, Tom St Denis
     16 */
     17 
     18 /**
     19    Find a hash flexibly.  First by name then if not present by digest size
     20    @param name        The name of the hash desired
     21    @param digestlen   The minimum length of the digest size (octets)
     22    @return >= 0 if found, -1 if not present
     23 */int find_hash_any(const char *name, int digestlen)
     24 {
     25    int x, y, z;
     26    LTC_ARGCHK(name != NULL);
     27 
     28    x = find_hash(name);
     29    if (x != -1) return x;
     30 
     31    LTC_MUTEX_LOCK(&ltc_hash_mutex);
     32    y = MAXBLOCKSIZE+1;
     33    z = -1;
     34    for (x = 0; x < TAB_SIZE; x++) {
     35        if (hash_descriptor[x].name == NULL) {
     36           continue;
     37        }
     38        if ((int)hash_descriptor[x].hashsize >= digestlen && (int)hash_descriptor[x].hashsize < y) {
     39           z = x;
     40           y = hash_descriptor[x].hashsize;
     41        }
     42    }
     43    LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
     44    return z;
     45 }
     46 
     47 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_find_hash_any.c,v $ */
     48 /* $Revision: 1.5 $ */
     49 /* $Date: 2006/03/31 14:15:35 $ */
     50