// rc2.h - originally written and placed in the public domain by Wei Dai

/// \file rc2.h

/// \brief Classes for the RC2 block cipher

/// \since Crypto++ 3.0

#ifndef CRYPTOPP_RC2_H

#define CRYPTOPP_RC2_H

#include "seckey.h"

#include "secblock.h"

#include "algparam.h"

NAMESPACE_BEGIN(CryptoPP)

/// \brief RC2 block cipher information

/// \since Crypto++ 3.0

struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>

{

  CRYPTOPP_CONSTANT(DEFAULT_EFFECTIVE_KEYLENGTH = 1024);

  CRYPTOPP_CONSTANT(MAX_EFFECTIVE_KEYLENGTH = 1024);

  CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "RC2";}

};

/// \brief RC2 block cipher

/// \sa <a href="http://www.cryptopp.com/wiki/RC2">RC2</a> on the Crypto Lounge.

/// \since Crypto++ 3.0

class RC2 : public RC2_Info, public BlockCipherDocumentation

{

  /// \brief Class specific methods used to operate the cipher.

  /// \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions

  class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<RC2_Info>

  {

  public:

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

    unsigned int OptimalDataAlignment() const {return GetAlignmentOf<word16>();}

  protected:

    FixedSizeSecBlock<word16, 64> K;  // expanded key table

  };

  /// \brief Class specific methods used to operate the cipher in the forward direction.

  /// \details Implementations and overrides in \p Enc apply to \p ENCRYPTION.

  class CRYPTOPP_NO_VTABLE Enc : public Base

  {

  public:

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

  };

  /// \brief Class specific methods used to operate the cipher in the reverse direction.

  /// \details Implementations and overrides in \p Dec apply to \p DECRYPTION.

  class CRYPTOPP_NO_VTABLE Dec : public Base

  {

  public:

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

  };

public:

  /// \brief Class specific methods used to operate the cipher in the forward direction.

  /// \details Implementations and overrides in \p Encryption apply to \p ENCRYPTION.

  class Encryption : public BlockCipherFinal<ENCRYPTION, Enc>

  {

  public:

    Encryption() {}

    Encryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)

      {SetKey(key, keyLen);}

    Encryption(const byte *key, size_t keyLen, int effectiveKeyLen)

      {SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}

  };

  /// \brief Class specific methods used to operate the cipher in the reverse direction.

  /// \details Implementations and overrides in \p Decryption apply to \p DECRYPTION.

  class Decryption : public BlockCipherFinal<DECRYPTION, Dec>

  {

  public:

    Decryption() {}

    Decryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)

      {SetKey(key, keyLen);}

    Decryption(const byte *key, size_t keyLen, int effectiveKeyLen)

      {SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}

  };

};

typedef RC2::Encryption RC2Encryption;

typedef RC2::Decryption RC2Decryption;

NAMESPACE_END

#endif