// 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)
/// \class GOST_Info
/// \brief GOST block cipher information
struct GOST_Info : public FixedBlockSize<8>, public FixedKeyLength<32>
{
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "GOST";}
};
/// \class GOST
/// \brief GOST block cipher
/// \sa GOST
class GOST : public GOST_Info, public BlockCipherDocumentation
{
/// \class Base
/// \brief GOST block cipher default operation
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl
{
public:
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms);
protected:
static void PrecalculateSTable();
static const byte sBox[8][16];
static volatile bool sTableCalculated;
static word32 sTable[4][256];
FixedSizeSecBlock m_key;
};
/// \class Enc
/// \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;
};
/// \class Dec
/// \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;
typedef BlockCipherFinal Decryption;
};
typedef GOST::Encryption GOSTEncryption;
typedef GOST::Decryption GOSTDecryption;
NAMESPACE_END
#endif