source-engine/thirdparty/cryptopp/3way.h

// 3way.h - originally written and placed in the public domain by Wei Dai

/// \file 3way.h
/// \brief Classes for the 3-Way block cipher

#ifndef CRYPTOPP_THREEWAY_H
#define CRYPTOPP_THREEWAY_H

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

NAMESPACE_BEGIN(CryptoPP)

/// \brief ThreeWay block cipher information
struct ThreeWay_Info : public FixedBlockSize<12>, public FixedKeyLength<12>, public VariableRounds<11>
{
	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "3-Way";}
};

/// \brief ThreeWay block cipher
/// \sa <a href="http://www.cryptopp.com/wiki/3-Way">3-Way</a>
class ThreeWay : public ThreeWay_Info, public BlockCipherDocumentation
{
	/// \brief Class specific implementation and overrides used to operate the cipher.
	/// \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
	class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<ThreeWay_Info>
	{
	public:
		void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params);

	protected:
		unsigned int m_rounds;
		FixedSizeSecBlock<word32, 3> m_k;
	};

	/// \brief Class specific methods used to operate the cipher in the forward direction.
	/// \details Implementations and overrides in \p Enc apply to \p ENCRYPTION.
	class CRYPTOPP_NO_VTABLE Enc : public Base
	{
	public:
		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
	};

	/// \brief Class specific methods used to operate the cipher in the reverse direction.
	/// \details Implementations and overrides in \p Dec apply to \p DECRYPTION.
	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 ThreeWay::Encryption ThreeWayEncryption;
typedef ThreeWay::Decryption ThreeWayDecryption;

NAMESPACE_END

#endif