/* 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@iahu.ca, http://libtomcrypt.org *//* EAX Implementation by Tom St Denis */#include "mycrypt.h"#ifdef EAX_MODEint eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt, unsigned long length){   int err;      _ARGCHK(eax != NULL);   _ARGCHK(pt  != NULL);   _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