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

/// \file safer.h

/// \brief Classes for the SAFER and SAFER-K block ciphers

#ifndef CRYPTOPP_SAFER_H

#define CRYPTOPP_SAFER_H

#include "seckey.h"

#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

/// \brief SAFER block cipher

class SAFER

{

public:

  /// \brief SAFER block cipher default operation

  class CRYPTOPP_NO_VTABLE Base : public BlockCipher

  {

  public:

    unsigned int OptimalDataAlignment() const {return 1;}

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

  protected:

    virtual bool Strengthened() const =0;

    SecByteBlock keySchedule;

    static const byte exp_tab[256];

    static const byte log_tab[256];

  };

  /// \brief SAFER block cipher encryption operation

  class CRYPTOPP_NO_VTABLE Enc : public Base

  {

  public:

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

  };

  /// \brief SAFER block cipher decryption operation

  class CRYPTOPP_NO_VTABLE Dec : public Base

  {

  public:

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

  };

};

/// \brief SAFER block cipher default implementation

/// \tparam BASE SAFER::Enc or SAFER::Dec derived base class

/// \tparam INFO SAFER_Info derived class

/// \tparam STR flag indicating a strengthened implementation

/// \details SAFER-K is not strengthened; while SAFER-SK is strengthened.

template <class BASE, class INFO, bool STR>

class CRYPTOPP_NO_VTABLE SAFER_Impl : public BlockCipherImpl<INFO, BASE>

{

protected:

  bool Strengthened() const {return STR;}

CryptoPP::SAFER_Impl<CryptoPP::SAFER::Enc, CryptoPP::SAFER_K_Info, false>::Strengthened() const

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  bool Strengthened() const {return STR;}

CryptoPP::SAFER_Impl<CryptoPP::SAFER::Enc, CryptoPP::SAFER_SK_Info, true>::Strengthened() const

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  bool Strengthened() const {return STR;}

Unexecuted instantiation: CryptoPP::SAFER_Impl<CryptoPP::SAFER::Dec, CryptoPP::SAFER_K_Info, false>::Strengthened() const

CryptoPP::SAFER_Impl<CryptoPP::SAFER::Dec, CryptoPP::SAFER_SK_Info, true>::Strengthened() const

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  bool Strengthened() const {return STR;}

};

/// \brief SAFER-K block cipher information

struct SAFER_K_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>

{

  CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SAFER-K";}

};

/// \brief SAFER-K block cipher

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

class SAFER_K : public SAFER_K_Info, public SAFER, public BlockCipherDocumentation

{

public:

  typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_K_Info, false> > Encryption;

  typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_K_Info, false> > Decryption;

};

/// \brief SAFER-SK block cipher information

struct SAFER_SK_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>

{

  CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SAFER-SK";}

};

/// \brief SAFER-SK block cipher

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

class SAFER_SK : public SAFER_SK_Info, public SAFER, public BlockCipherDocumentation

{

public:

  typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_SK_Info, true> > Encryption;

  typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_SK_Info, true> > Decryption;

};

typedef SAFER_K::Encryption SAFER_K_Encryption;

typedef SAFER_K::Decryption SAFER_K_Decryption;

typedef SAFER_SK::Encryption SAFER_SK_Encryption;

typedef SAFER_SK::Decryption SAFER_SK_Decryption;

NAMESPACE_END

#endif