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externals/cryptopp/gost.h

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+// gost.h - originally written and placed in the public domain by Wei Dai
+
+/// \file gost.h
+/// \brief Classes for the GIST block cipher
+
+#ifndef CRYPTOPP_GOST_H
+#define CRYPTOPP_GOST_H
+
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief GOST block cipher information
+/// \since Crypto++ 2.1
+struct GOST_Info : public FixedBlockSize<8>, public FixedKeyLength<32>
+{
+	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "GOST";}
+};
+
+/// \brief GOST block cipher
+/// \sa <a href="http://www.cryptopp.com/wiki/GOST">GOST</a>
+/// \since Crypto++ 2.1
+class GOST : public GOST_Info, public BlockCipherDocumentation
+{
+	/// \brief GOST block cipher default operation
+	class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<GOST_Info>
+	{
+	public:
+		void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
+
+	protected:
+		static void PrecalculateSTable();
+
+		static const byte sBox[8][16];
+		static volatile bool sTableCalculated;
+		static word32 sTable[4][256];
+
+		FixedSizeSecBlock<word32, 8> m_key;
+	};
+
+	/// \brief GOST block cipher encryption operation
+	class CRYPTOPP_NO_VTABLE Enc : public Base
+	{
+	public:
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+	};
+
+	/// \brief GOST 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;
+};
+
+typedef GOST::Encryption GOSTEncryption;
+typedef GOST::Decryption GOSTDecryption;
+
+NAMESPACE_END
+
+#endif