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

/// \file twofish.h

/// \brief Classes for the Twofish block cipher

#ifndef CRYPTOPP_TWOFISH_H

#define CRYPTOPP_TWOFISH_H

#include "seckey.h"

#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

/// \brief Twofish block cipher information

/// \since Crypto++ 3.1

struct Twofish_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 8>, FixedRounds<16>

{

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

};

/// \brief Twofish block cipher

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

/// \since Crypto++ 3.1

class Twofish : public Twofish_Info, public BlockCipherDocumentation

{

  class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<Twofish_Info>

  {

  public:

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

  protected:

    static word32 h0(word32 x, const word32 *key, unsigned int kLen);

    static word32 h(word32 x, const word32 *key, unsigned int kLen);

    static const byte q[2][256];

    static const word32 mds[4][256];

    FixedSizeSecBlock<word32, 40> m_k;

    FixedSizeSecBlock<word32, 4*256> m_s;

  };

  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 Twofish::Encryption TwofishEncryption;

typedef Twofish::Decryption TwofishDecryption;

NAMESPACE_END

#endif