view libtomcrypt/src/encauth/eax/eax_decrypt.c @ 561:541ebf5bf0f6

propagate from branch 'au.asn.ucc.matt.dropbear.cli-agent' (head eb0dae4b62e243ba37a897beb7ba81a4f637d8b3) to branch 'au.asn.ucc.matt.dropbear' (head ff0abce7b29e61630e3b09e5fc5820ae6e192808)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 30 Jul 2009 15:15:12 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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/* 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, [email protected], http://libtomcrypt.com
 */

/** 
    @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

/* $Source: /cvs/libtom/libtomcrypt/src/encauth/eax/eax_decrypt.c,v $ */
/* $Revision: 1.4 $ */
/* $Date: 2006/03/31 14:15:35 $ */