// rc6.h - originally written and placed in the public domain by Wei Dai

/// \file rc6.h

/// \brief Classes for the RC6 block cipher

/// \since Crypto++ 3.0

#ifndef CRYPTOPP_RC6_H

#define CRYPTOPP_RC6_H

#include "seckey.h"

#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

/// \brief RC6 block cipher information

/// \since Crypto++ 3.0

struct RC6_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 8>, public VariableRounds<20>

{

  CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "RC6";}

  typedef word32 RC6_WORD;

};

/// \brief RC6 block cipher

/// \sa <a href="http://www.cryptopp.com/wiki/RC6">RC6</a>

/// \since Crypto++ 3.0

class RC6 : public RC6_Info, public BlockCipherDocumentation

{

  class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<RC6_Info>

  {

  public:

    void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);

  protected:

    unsigned int r;       // number of rounds

    SecBlock<RC6_WORD> sTable;  // expanded key table

  };

  class CRYPTOPP_NO_VTABLE Enc : public Base

  {

  public:

    void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;

  };

  class CRYPTOPP_NO_VTABLE Dec : public Base

  {

  public:

    void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;

  };

public:

  typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;

  typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;

};

typedef RC6::Encryption RC6Encryption;

typedef RC6::Decryption RC6Decryption;

NAMESPACE_END

#endif