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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_prng_is_valid.c
     15   Determine if PRNG is valid, Tom St Denis
     16 */
     17 
     18 /*
     19    Test if a PRNG index is valid
     20    @param idx   The index of the PRNG to search for
     21    @return CRYPT_OK if valid
     22 */
     23 int prng_is_valid(int idx)
     24 {
     25    LTC_MUTEX_LOCK(&ltc_prng_mutex);
     26    if (idx < 0 || idx >= TAB_SIZE || prng_descriptor[idx].name == NULL) {
     27       LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
     28       return CRYPT_INVALID_PRNG;
     29    }
     30    LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
     31    return CRYPT_OK;
     32 }
     33 
     34 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_prng_is_valid.c,v $ */
     35 /* $Revision: 1.5 $ */
     36 /* $Date: 2006/03/31 14:15:35 $ */
     37