File: serpent.h

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// serpent.h - written and placed in the public domain by Wei Dai

//! \file serpent.h
//! \brief Classes for the Serpent block cipher

#ifndef CRYPTOPP_SERPENT_H
#define CRYPTOPP_SERPENT_H

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

NAMESPACE_BEGIN(CryptoPP)

//! \class Serpent_Info
//! \brief Serpent block cipher information
struct Serpent_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 8>, public FixedRounds<32>
{
	CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "Serpent";}
};

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

	protected:
		FixedSizeSecBlock<word32, 33*4> m_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 Serpent::Encryption SerpentEncryption;
typedef Serpent::Decryption SerpentDecryption;

NAMESPACE_END

#endif