Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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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