wid_wake.h

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/*
* WiderWake
* (C) 1999-2008 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
 
#ifndef BOTAN_WIDER_WAKE_H__
#define BOTAN_WIDER_WAKE_H__
 
#include <botan/stream_cipher.h>
 
namespace Botan {
 
/**
* WiderWake4+1-BE
*
* Note: quite old and possibly not safe; use XSalsa20 or a block
* cipher in counter mode.
*/
class BOTAN_DLL WiderWake_41_BE : public StreamCipher
   {
   public:
      void cipher(const byte[], byte[], size_t);
      void set_iv(const byte[], size_t);
 
      bool valid_iv_length(size_t iv_len) const
         { return (iv_len == 8); }
 
      Key_Length_Specification key_spec() const
         {
         return Key_Length_Specification(16);
         }
 
      void clear();
      std::string name() const { return "WiderWake4+1-BE"; }
      StreamCipher* clone() const { return new WiderWake_41_BE; }
 
      WiderWake_41_BE() : T(256), state(5), t_key(4),
                          buffer(DEFAULT_BUFFERSIZE), position(0)
         {}
 
   private:
      void key_schedule(const byte[], size_t);
 
      void generate(size_t);
 
      SecureVector<u32bit> T;
      SecureVector<u32bit> state;
      SecureVector<u32bit> t_key;
      SecureVector<byte> buffer;
      size_t position;
   };
 
}
 
#endif