gost.h

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#ifndef CRYPTOPP_GOST_H
#define CRYPTOPP_GOST_H

/** \file
*/

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

NAMESPACE_BEGIN(CryptoPP)

//! _
struct GOST_Info : public FixedBlockSize<8>, public FixedKeyLength<32>
{
        static const char *StaticAlgorithmName() {return "GOST";}
};

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

        protected:
                static void PrecalculateSTable();

                static const byte sBox[8][16];
                static bool sTableCalculated;
                static word32 sTable[4][256];

                FixedSizeSecBlock<word32, 8> key;
        };

        class CRYPTOPP_NO_VTABLE Enc : public Base
        {
        public:
                void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
        };

        class CRYPTOPP_NO_VTABLE Dec : public Base
        {
        public:
                void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
        };

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

typedef GOST::Encryption GOSTEncryption;
typedef GOST::Decryption GOSTDecryption;

NAMESPACE_END

#endif

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