cascade.h

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/*
* Block Cipher Cascade
* (C) 2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
 
#ifndef BOTAN_CASCADE_H__
#define BOTAN_CASCADE_H__
 
#include <botan/block_cipher.h>
 
namespace Botan {
 
/**
* Block Cipher Cascade
*/
class BOTAN_DLL Cascade_Cipher : public BlockCipher
   {
   public:
      void encrypt_n(const byte in[], byte out[], size_t blocks) const;
      void decrypt_n(const byte in[], byte out[], size_t blocks) const;
 
      size_t block_size() const { return block; }
 
      Key_Length_Specification key_spec() const
         {
         return Key_Length_Specification(cipher1->maximum_keylength() +
                                         cipher2->maximum_keylength());
         }
 
      void clear();
      std::string name() const;
      BlockCipher* clone() const;
 
      /**
      * Create a cascade of two block ciphers
      * @param cipher1 the first cipher
      * @param cipher2 the second cipher
      */
      Cascade_Cipher(BlockCipher* cipher1, BlockCipher* cipher2);
 
      ~Cascade_Cipher();
   private:
      void key_schedule(const byte[], size_t);
 
      size_t block;
      BlockCipher* cipher1;
      BlockCipher* cipher2;
   };
 
 
}
 
#endif