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externals/cryptopp/safer.h

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+// safer.h - originally written and placed in the public domain by Wei Dai
+
+/// \file safer.h
+/// \brief Classes for the SAFER and SAFER-K block ciphers
+
+#ifndef CRYPTOPP_SAFER_H
+#define CRYPTOPP_SAFER_H
+
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief SAFER block cipher
+class SAFER
+{
+public:
+	/// \brief SAFER block cipher default operation
+	class CRYPTOPP_NO_VTABLE Base : public BlockCipher
+	{
+	public:
+		unsigned int OptimalDataAlignment() const {return 1;}
+		void UncheckedSetKey(const byte *userkey, unsigned int length, const NameValuePairs &params);
+
+	protected:
+		virtual bool Strengthened() const =0;
+
+		SecByteBlock keySchedule;
+		static const byte exp_tab[256];
+		static const byte log_tab[256];
+	};
+
+	/// \brief SAFER block cipher encryption operation
+	class CRYPTOPP_NO_VTABLE Enc : public Base
+	{
+	public:
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+	};
+
+	/// \brief SAFER block cipher decryption operation
+	class CRYPTOPP_NO_VTABLE Dec : public Base
+	{
+	public:
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+	};
+};
+
+/// \brief SAFER block cipher default implementation
+/// \tparam BASE SAFER::Enc or SAFER::Dec derived base class
+/// \tparam INFO SAFER_Info derived class
+/// \tparam STR flag indicating a strengthened implementation
+/// \details SAFER-K is not strengthened; while SAFER-SK is strengthened.
+template <class BASE, class INFO, bool STR>
+class CRYPTOPP_NO_VTABLE SAFER_Impl : public BlockCipherImpl<INFO, BASE>
+{
+protected:
+	bool Strengthened() const {return STR;}
+};
+
+/// \brief SAFER-K block cipher information
+struct SAFER_K_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
+{
+	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SAFER-K";}
+};
+
+/// \brief SAFER-K block cipher
+/// \sa <a href="http://www.cryptopp.com/wiki/SAFER-K">SAFER-K</a>
+class SAFER_K : public SAFER_K_Info, public SAFER, public BlockCipherDocumentation
+{
+public:
+	typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_K_Info, false> > Encryption;
+	typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_K_Info, false> > Decryption;
+};
+
+/// \brief SAFER-SK block cipher information
+struct SAFER_SK_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
+{
+	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SAFER-SK";}
+};
+
+/// \brief SAFER-SK block cipher
+/// \sa <a href="http://www.cryptopp.com/wiki/SAFER-SK">SAFER-SK</a>
+class SAFER_SK : public SAFER_SK_Info, public SAFER, public BlockCipherDocumentation
+{
+public:
+	typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_SK_Info, true> > Encryption;
+	typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_SK_Info, true> > Decryption;
+};
+
+typedef SAFER_K::Encryption SAFER_K_Encryption;
+typedef SAFER_K::Decryption SAFER_K_Decryption;
+
+typedef SAFER_SK::Encryption SAFER_SK_Encryption;
+typedef SAFER_SK::Decryption SAFER_SK_Decryption;
+
+NAMESPACE_END
+
+#endif