c_rsa.h

RSA和DES的一些类~~可以对初学者有些帮助

// C_RSA.h: interface for the C_RSA class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_C_RSA_H__DFA1ACD6_44FD_49A6_BCE5_9EB1A6A6CC1D__INCLUDED_)
#define AFX_C_RSA_H__DFA1ACD6_44FD_49A6_BCE5_9EB1A6A6CC1D__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <string>
using namespace std;

class C_RSA  
{
public:
	struct S_CODE
	{
		int nEncryptCode;
		int nDecryptCode;
		int nN;
	};

	typedef S_CODE ENCRYPTTYPE;

public:
	C_RSA();
	virtual ~C_RSA();

public:
    /// First produce the encrypt code & decrypt code
    ENCRYPTTYPE & ProduceEncryptInFo(int nP, int nQ);

	/// Encrypt the proclaim 
	bool Encrypt(string &strContent, string & strEncryptContent);

	/// Decrypt the content
	bool Decrypt(string & strEncryptContent, string &strContent,  int nDecryptCode, int nN);

	/// Auto produce encrypt code & decrypt code
	ENCRYPTTYPE & AutoProduceEncryptInFo(void);


private:
	bool IsPrime(int nX);
	int  Gcd(int nA, int nB);
	void Euler(int nE, int nFin);
	void ProduceEncryCode(int nFin);
	int  Power(int nA, int nN, int nM);
	

private:
	int m_nP;   //P factor
	int m_nQ;   //Q factor
	ENCRYPTTYPE m_nEncrytInFo; // information

	
};

#endif // !defined(AFX_C_RSA_H__DFA1ACD6_44FD_49A6_BCE5_9EB1A6A6CC1D__INCLUDED_)