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

/// \file shark.h

/// \brief Classes for the SHARK block cipher

/// \since Crypto++ 2.1

#ifndef CRYPTOPP_SHARK_H

#define CRYPTOPP_SHARK_H

#include "config.h"

#include "seckey.h"

#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

/// \brief SHARK block cipher information

/// \since Crypto++ 2.1

struct SHARK_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<6, 2>

{

  CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SHARK-E";}

};

/// \brief SHARK block cipher

/// <a href="http://www.cryptopp.com/wiki/SHARK-E">SHARK-E</a>

/// \since Crypto++ 2.1

class SHARK : public SHARK_Info, public BlockCipherDocumentation

{

  /// \brief SHARK block cipher default operation

  /// \since Crypto++ 2.1

  class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<SHARK_Info>

  {

  public:

    void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &param);

  protected:

    unsigned int m_rounds;

    SecBlock<word64> m_roundKeys;

  };

  /// \brief SHARK block cipher encryption operation

  /// \since Crypto++ 2.1

  class CRYPTOPP_NO_VTABLE Enc : public Base

  {

  public:

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

    // used by Base to do key setup

    void InitForKeySetup();

  private:

    static const byte sbox[256];

    static const word64 cbox[8][256];

  };

  /// \brief SHARK block cipher decryption operation

  /// \since Crypto++ 2.1

  class CRYPTOPP_NO_VTABLE Dec : public Base

  {

  public:

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

  private:

    static const byte sbox[256];

    static const word64 cbox[8][256];

  };

public:

  typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;

  typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;

};

typedef SHARK::Encryption SHARKEncryption;

typedef SHARK::Decryption SHARKDecryption;

NAMESPACE_END

#endif