gost.h

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// gost.h - originally written and placed in the public domain by Wei Dai
 
/// \file gost.h
/// \brief Classes for the GIST block cipher
 
#ifndef CRYPTOPP_GOST_H
#define CRYPTOPP_GOST_H
 
#include "seckey.h"
#include "secblock.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
/// \brief GOST block cipher information
/// \since Crypto++ 2.1
struct GOST_Info : public FixedBlockSize<8>, public FixedKeyLength<32>
{
    CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "GOST";}
};
 
/// \brief GOST block cipher
/// \sa <a href="http://www.cryptopp.com/wiki/GOST">GOST</a>
/// \since Crypto++ 2.1
class GOST : public GOST_Info, public BlockCipherDocumentation
{
    /// \brief GOST block cipher default operation
    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 volatile bool sTableCalculated;
        static word32 sTable[4][256];
 
        FixedSizeSecBlock<word32, 8> m_key;
    };
 
    /// \brief GOST block cipher encryption operation
    class CRYPTOPP_NO_VTABLE Enc : public Base
    {
    public:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
    };
 
    /// \brief GOST block cipher decryption operation
    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