hc128.hpp

/*
   Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING. If not, write to the
   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
   MA  02110-1301  USA.
*/

/* hc128.hpp defines HC128
*/


#ifndef TAO_CRYPT_HC128_HPP
#define TAO_CRYPT_HC128_HPP

#include "misc.hpp"

namespace TaoCrypt {


// HC128 encryption and decryption
class HC128 {
public:

    typedef HC128 Encryption;
    typedef HC128 Decryption;


    HC128() {}

    void Process(byte*, const byte*, word32);
    void SetKey(const byte*, const byte*);
private:
    word32 T_[1024];             /* P[i] = T[i];  Q[i] = T[1024 + i ]; */
    word32 X_[16];
    word32 Y_[16];
    word32 counter1024_;         /* counter1024 = i mod 1024 at the ith step */
    word32 key_[8];
    word32 iv_[8];

    void SetIV(const byte*);
    void GenerateKeystream(word32*);
    void SetupUpdate();

    HC128(const HC128&);                  // hide copy
    const HC128 operator=(const HC128&);  // and assign
};

} // namespace


#endif // TAO_CRYPT_HC128_HPP