/* 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.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 $ */