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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_prng.c
     15   Unregister a PRNG, Tom St Denis
     16 */
     17 
     18 /**
     19   Unregister a PRNG from the descriptor table
     20   @param prng   The PRNG descriptor to remove
     21   @return CRYPT_OK on success
     22 */
     23 int unregister_prng(const struct ltc_prng_descriptor *prng)
     24 {
     25    int x;
     26 
     27    LTC_ARGCHK(prng != NULL);
     28 
     29    /* is it already registered? */
     30    LTC_MUTEX_LOCK(&ltc_prng_mutex);
     31    for (x = 0; x < TAB_SIZE; x++) {
     32        if (XMEMCMP(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor)) != 0) {
     33           prng_descriptor[x].name = NULL;
     34           LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
     35           return CRYPT_OK;
     36        }
     37    }
     38    LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
     39    return CRYPT_ERROR;
     40 }
     41 
     42 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_unregister_prng.c,v $ */
     43 /* $Revision: 1.6 $ */
     44 /* $Date: 2006/11/01 09:28:17 $ */
     45