/*	Copyright (C) 2006, Mike Gashler	This library is free software; you can redistribute it and/or	modify it under the terms of the GNU Lesser General Public	License as published by the Free Software Foundation; either	version 2.1 of the License, or (at your option) any later version.	see http://www.gnu.org/copyleft/lesser.html*/#ifndef __GKEYPAIR_H__#define __GKEYPAIR_H__class GBigNumber;class GXMLTag;class GRand;// This is my home-made (so don't trust it) implementation of symmetric key cryptography.class GKeyPair{private:	GBigNumber* m_pPublicKey;	GBigNumber* m_pPrivateKey;	GBigNumber* m_pN;public:	GKeyPair();	virtual ~GKeyPair();#ifndef NO_TEST_CODE	static void Test();#endif // !NO_TEST_CODE	// Input:  The size that pRand was seeded with will determine the size of the keys	// Output: "this" will hold both a public and private key when it returns	void GenerateKeyPair(GRand* pRand);	// Takes ownership of the GBigNumber you pass in	void SetPublicKey(GBigNumber* pPublicKey);	// Takes ownership of the GBigNumber you pass in	void SetPrivateKey(GBigNumber* pPrivateKey);	// Takes ownership of the GBigNumber you pass in	void SetN(GBigNumber* pN);	// Copies the GBigNumber you pass in	void CopyPublicKey(GBigNumber* pPublicKey);	// Copies the GBigNumber you pass in	void CopyPrivateKey(GBigNumber* pPrivateKey);	// Copies the GBigNumber you pass in	void CopyN(GBigNumber* pN);	// Get the public part of the key (not including N which is public too)	GBigNumber* GetPublicKey();	// Get the private part of the key	GBigNumber* GetPrivateKey();	// Get the N part of the key	GBigNumber* GetN();	// Serialize the key pair. You are responsible to delete the GXMLTag this returns	GXMLTag* ToXML(bool bIncludePrivateKey);	// Deserialize the key pari	bool FromXML(GXMLTag* pTag);	// Deserialize the key pari	bool FromXML(const char* pBuf, int nBufSize);	// Returns the maximum number of bytes that you can encrypt using the PowerMod method	int GetMaxBlockSize();	// This is the method that encrypts/decrypts your message.	// If bPublicKey is true, it uses the public key.  If false it uses the private key.	// Note: you must delete the buffer this returns	unsigned char* PowerMod(const unsigned char* pInput, int nInputSize, bool bPublicKey, int* pnOutputSize);};#endif // __GKEYPAIR_H__