square.h

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

//! \file square.h
//! \brief Classes for the Square block cipher

#ifndef CRYPTOPP_SQUARE_H
#define CRYPTOPP_SQUARE_H

#include "seckey.h"
#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

//! \class Square_Info
//! \brief Square block cipher information
struct Square_Info : public FixedBlockSize<16>, public FixedKeyLength<16>, FixedRounds<8>
{
    CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "Square";}
};

//! \class Square
//! \brief Square block cipher
//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#Square">Square</a>
class Square : public Square_Info, public BlockCipherDocumentation
{
    class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<Square_Info>
    {
    public:
        void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);

    protected:
        FixedSizeSecBlock<word32, 4*(ROUNDS+1)> m_roundkeys;
    };

    class CRYPTOPP_NO_VTABLE Enc : public Base
    {
    public:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
    private:
        static const byte Se[256];
        static const word32 Te[4][256];
    };

    class CRYPTOPP_NO_VTABLE Dec : public Base
    {
    public:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
    private:
        static const byte Sd[256];
        static const word32 Td[4][256];
    };

public:
    typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
    typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
};

typedef Square::Encryption SquareEncryption;
typedef Square::Decryption SquareDecryption;

NAMESPACE_END

#endif