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externals/cryptopp/cast.h

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+// cast.h - originally written and placed in the public domain by Wei Dai
+
+/// \file cast.h
+/// \brief Classes for the CAST-128 and CAST-256 block ciphers
+/// \since Crypto++ 2.2
+
+#ifndef CRYPTOPP_CAST_H
+#define CRYPTOPP_CAST_H
+
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief CAST block cipher base
+/// \since Crypto++ 2.2
+class CAST
+{
+protected:
+	static const word32 S[8][256];
+};
+
+/// \brief CAST128 block cipher information
+/// \since Crypto++ 2.2
+struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>
+{
+	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "CAST-128";}
+};
+
+/// \brief CAST128 block cipher
+/// \sa <a href="http://www.cryptopp.com/wiki/CAST-128">CAST-128</a>
+/// \since Crypto++ 2.2
+class CAST128 : public CAST128_Info, public BlockCipherDocumentation
+{
+	/// \brief CAST128 block cipher default operation
+	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;
+		mutable FixedSizeSecBlock<word32, 3> m_t;
+	};
+
+	/// \brief CAST128 block cipher encryption operation
+	class CRYPTOPP_NO_VTABLE Enc : public Base
+	{
+	public:
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+	};
+
+	/// \brief CAST128 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;
+};
+
+/// \brief CAST256 block cipher information
+/// \since Crypto++ 4.0
+struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 4>
+{
+	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "CAST-256";}
+};
+
+/// \brief CAST256 block cipher
+/// \sa <a href="http://www.cryptopp.com/wiki/CAST-256">CAST-256</a>
+/// \since Crypto++ 4.0
+class CAST256 : public CAST256_Info, public BlockCipherDocumentation
+{
+	/// \brief CAST256 block cipher default operation
+	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;
+		mutable FixedSizeSecBlock<word32, 8> kappa;
+		mutable FixedSizeSecBlock<word32, 3> m_t;
+	};
+
+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