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externals/cryptopp/rc2.h

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+// rc2.h - originally written and placed in the public domain by Wei Dai
+
+/// \file rc2.h
+/// \brief Classes for the RC2 block cipher
+/// \since Crypto++ 3.0
+
+#ifndef CRYPTOPP_RC2_H
+#define CRYPTOPP_RC2_H
+
+#include "seckey.h"
+#include "secblock.h"
+#include "algparam.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief RC2 block cipher information
+/// \since Crypto++ 3.0
+struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>
+{
+	CRYPTOPP_CONSTANT(DEFAULT_EFFECTIVE_KEYLENGTH = 1024);
+	CRYPTOPP_CONSTANT(MAX_EFFECTIVE_KEYLENGTH = 1024);
+	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "RC2";}
+};
+
+/// \brief RC2 block cipher
+/// \sa <a href="http://www.cryptopp.com/wiki/RC2">RC2</a> on the Crypto Lounge.
+/// \since Crypto++ 3.0
+class RC2 : public RC2_Info, public BlockCipherDocumentation
+{
+	/// \brief Class specific methods 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<RC2_Info>
+	{
+	public:
+		void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
+		unsigned int OptimalDataAlignment() const {return GetAlignmentOf<word16>();}
+
+	protected:
+		FixedSizeSecBlock<word16, 64> K;  // expanded key table
+	};
+
+	/// \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:
+
+	/// \brief Class specific methods used to operate the cipher in the forward direction.
+	/// \details Implementations and overrides in \p Encryption apply to \p ENCRYPTION.
+	class Encryption : public BlockCipherFinal<ENCRYPTION, Enc>
+	{
+	public:
+		Encryption() {}
+		Encryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
+			{SetKey(key, keyLen);}
+		Encryption(const byte *key, size_t keyLen, int effectiveKeyLen)
+			{SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
+	};
+
+	/// \brief Class specific methods used to operate the cipher in the reverse direction.
+	/// \details Implementations and overrides in \p Decryption apply to \p DECRYPTION.
+	class Decryption : public BlockCipherFinal<DECRYPTION, Dec>
+	{
+	public:
+		Decryption() {}
+		Decryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
+			{SetKey(key, keyLen);}
+		Decryption(const byte *key, size_t keyLen, int effectiveKeyLen)
+			{SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
+	};
+};
+
+typedef RC2::Encryption RC2Encryption;
+typedef RC2::Decryption RC2Decryption;
+
+NAMESPACE_END
+
+#endif