tomcrypt/src/encauth/eax/eax_decrypt.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.
 *
 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
 */

/** 
    @file eax_decrypt.c
    EAX implementation, decrypt block, by Tom St Denis
*/
#include "tomcrypt.h"

#ifdef EAX_MODE

/**  
   Decrypt data with the EAX protocol
   @param eax     The EAX state
   @param ct      The ciphertext
   @param pt      [out] The plaintext
   @param length  The length (octets) of the ciphertext
   @return CRYPT_OK if successful
*/
int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt, 
                unsigned long length)
{
   int err;
   
   LTC_ARGCHK(eax != NULL);
   LTC_ARGCHK(pt  != NULL);
   LTC_ARGCHK(ct  != NULL);

   /* omac ciphertext */
   if ((err = omac_process(&eax->ctomac, ct, length)) != CRYPT_OK) {
      return err;
   }

   /* decrypt  */
   return ctr_decrypt(ct, pt, length, &eax->ctr);
}

#endif