ice_key.h

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#ifndef ICE_KEY_CLASS
#define ICE_KEY_CLASS

/*****************************************************************************\
*                                                                             *
*  Name   : ice_key                                                           *
*  Author : Matthew Kwan  (http://www.cs.mu.oz.au/~mkwan/ice)                 *
*  Mods   : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 1996-$now By Author.  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; either version 2 of   *
* the License or (at your option) any later version.  This is online at:      *
*     http://www.fsf.org/copyleft/gpl.html                                    *
* Please send any updates to: fred@gruntose.com                               *
\*****************************************************************************/

#include "crypto_dll.h"

#include <basis/object_base.h>

// forward.
class ice_subkey;


class CRYPTO_CLASS_STYLE ice_key : public virtual object_base
{
public:
  ice_key(int blocks, bool randomize = true);

  virtual ~ice_key();

  IMPLEMENT_CLASS_NAME("ice_key");

  bool set(const byte_array &key);

  bool encrypt(const byte_array &plain_text, byte_array &cipher_text) const;

  bool decrypt(const byte_array &cipher_text, byte_array &plain_text) const;

  int key_size() const { return _size * 8; }
  int blocks() const { return _size; }
  int block_size() const { return 8; }

private:
  int _size;  
  int _rounds;  
  ice_subkey *_keysched;  
  bool _key_set;  
  chaos *_randomizer;  
  bool _randomize;  

  typedef byte code_granule[8];

  byte_array int_to_bytes(u_int to_encode) const;

  u_int bytes_to_int(const byte_array &to_decode) const;

  void encrypt_eight(const code_granule &plain_text,
          code_granule &cipher_text) const;

  void decrypt_eight(const code_granule &cipher_text,
          code_granule &plain_text) const;

  void schedule_build(unsigned short *k, int n, const int *keyrot);

  static void initialize_ice_sboxes();

  // not permitted.
  ice_key(const ice_key &);
  ice_key &operator =(const ice_key &);
};

#endif

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