/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org */#include "tomcrypt.h"/**  @file crypt_cipher_is_valid.c  Determine if cipher is valid, Tom St Denis*//*   Test if a cipher index is valid   @param idx   The index of the cipher to search for   @return CRYPT_OK if valid*/int cipher_is_valid(int idx){   LTC_MUTEX_LOCK(&ltc_cipher_mutex);   if (idx < 0 || idx >= TAB_SIZE || cipher_descriptor[idx].name == NULL) {      LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);      return CRYPT_INVALID_CIPHER;   }   LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);   return CRYPT_OK;}/* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_cipher_is_valid.c,v $ *//* $Revision: 1.4 $ *//* $Date: 2005/06/19 18:00:28 $ */