crypt_find_cipher_id.c

/* 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.
 */
#include "tomcrypt_private.h"

/**
  @file crypt_find_cipher_id.c
  Find cipher by ID, Tom St Denis
*/

/**
   Find a cipher by ID number
   @param ID    The ID (not same as index) of the cipher to find
   @return >= 0 if found, -1 if not present
*/
int find_cipher_id(unsigned char ID)
{
   int x;
   LTC_MUTEX_LOCK(&ltc_cipher_mutex);
   for (x = 0; x < TAB_SIZE; x++) {
       if (cipher_descriptor[x].ID == ID) {
          x = (cipher_descriptor[x].name == NULL) ? -1 : x;
          LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
          return x;
       }
   }
   LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
   return -1;
}

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