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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_unregister_cipher.c
     15   Unregister a cipher, Tom St Denis
     16 */
     17 
     18 /**
     19   Unregister a cipher from the descriptor table
     20   @param cipher   The cipher descriptor to remove
     21   @return CRYPT_OK on success
     22 */
     23 int unregister_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 (XMEMCMP(&cipher_descriptor[x], cipher, sizeof(struct ltc_cipher_descriptor)) == 0) {
     33           cipher_descriptor[x].name = NULL;
     34           cipher_descriptor[x].ID   = 255;
     35           LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
     36           return CRYPT_OK;
     37        }
     38    }
     39    LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
     40    return CRYPT_ERROR;
     41 }
     42 
     43 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_unregister_cipher.c,v $ */
     44 /* $Revision: 1.6 $ */
     45 /* $Date: 2006/11/01 09:28:17 $ */
     46