source: git/src-cryptopp/skipjack.h

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

//! \file skipjack.h
//! \brief Classes for the SKIPJACK block cipher

#ifndef CRYPTOPP_SKIPJACK_H
#define CRYPTOPP_SKIPJACK_H

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

NAMESPACE_BEGIN(CryptoPP)

//! \class SKIPJACK_Info
//! \brief SKIPJACK block cipher information
struct SKIPJACK_Info : public FixedBlockSize<8>, public FixedKeyLength<10>
{
        CRYPTOPP_DLL static const char * CRYPTOPP_API StaticAlgorithmName() {return "SKIPJACK";}
};

//! \class SKIPJACK
//! \brief SKIPJACK block cipher
//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#SKIPJACK">SKIPJACK</a>
class SKIPJACK : public SKIPJACK_Info, public BlockCipherDocumentation
{
        //! \class Base
        //! \brief SKIPJACK block cipher default operation
        class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<SKIPJACK_Info>
        {
        public:
                void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
                unsigned int OptimalDataAlignment() const {return GetAlignmentOf<word16>();}

        protected:
                static const byte fTable[256];

                FixedSizeSecBlock<byte, 10*256> tab;
        };

        //! \class Enc
        //! \brief SKIPJACK block cipher encryption operation
        class CRYPTOPP_DLL 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 Dec
        //! \brief SKIPJACK block cipher decryption operation
        class CRYPTOPP_DLL 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 SKIPJACK::Encryption SKIPJACKEncryption;
typedef SKIPJACK::Decryption SKIPJACKDecryption;

NAMESPACE_END

#endif