~zooko/cryptopp/trunk

#ifndef CRYPTOPP_CAST_H

#define CRYPTOPP_CAST_H

/** \file

*/

#include "seckey.h"

#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

class CAST

{

protected:

	static const word32 S[8][256];

};

//! algorithm info

struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>

{

	static const char *StaticAlgorithmName() {return "CAST-128";}

};

/// <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-128">CAST-128</a>

class CAST128 : public CAST128_Info, public BlockCipherDocumentation

{

	class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST128_Info>

	{

	public:

		void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);

	protected:

		bool reduced;

		FixedSizeSecBlock<word32, 32> K;

	};

	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;

};

//! algorithm info

struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32>

{

	static const char *StaticAlgorithmName() {return "CAST-256";}

};

//! <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-256">CAST-256</a>

class CAST256 : public CAST256_Info, public BlockCipherDocumentation

{

	class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST256_Info>

	{

	public:

		void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);

		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;

	protected:

		static const word32 t_m[8][24];

		static const unsigned int t_r[8][24];

		static void Omega(int i, word32 kappa[8]);

		FixedSizeSecBlock<word32, 8*12> K;

	};

public:

	typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;

	typedef BlockCipherFinal<DECRYPTION, Base> Decryption;

};

typedef CAST128::Encryption CAST128Encryption;

typedef CAST128::Decryption CAST128Decryption;

typedef CAST256::Encryption CAST256Encryption;

typedef CAST256::Decryption CAST256Decryption;

NAMESPACE_END

#endif