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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_register_cipher.c
     15   Register a cipher, Tom St Denis
     16 */
     17 
     18 /**
     19    Register a cipher with the descriptor table
     20    @param cipher   The cipher you wish to register
     21    @return value >= 0 if successfully added (or already present), -1 if unsuccessful
     22 */
     23 int register_cipher(const struct ltc_cipher_descriptor *cipher)
     24 {
     25    int x;
     26 
     27    LTC_ARGCHK(cipher != NULL);
     28 
     29    /* is it already registered? */
     30    LTC_MUTEX_LOCK(&ltc_cipher_mutex);
     31    for (x = 0; x < TAB_SIZE; x++) {
     32        if (cipher_descriptor[x].name != NULL && cipher_descriptor[x].ID == cipher->ID) {
     33           LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
     34           return x;
     35        }
     36    }
     37 
     38    /* find a blank spot */
     39    for (x = 0; x < TAB_SIZE; x++) {
     40        if (cipher_descriptor[x].name == NULL) {
     41           XMEMCPY(&cipher_descriptor[x], cipher, sizeof(struct ltc_cipher_descriptor));
     42           LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
     43           return x;
     44        }
     45    }
     46 
     47    /* no spot */
     48    LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
     49    return -1;
     50 }
     51 
     52 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_register_cipher.c,v $ */
     53 /* $Revision: 1.5 $ */
     54 /* $Date: 2006/03/31 14:15:35 $ */
     55