Introduction to implementing MFC’s simple encryption and decryption applet

简单的加密解密算法

       这个小程序是用来作为一个非常简单的对称加密算法，比移位加密稍微强那么一点点。

seed的话大家可以自己来设置，seed大概为60位，程序没有边界检查，很简陋，希望看官们别见笑。

// Code.h: interface for the CCode class. 
// 
////////////////////////////////////////////////////////////////////// 

#if !defined(AFX_CODE_H__D5B90563_053E_4256_A61D_7D56F8FB20CF__INCLUDED_) 
#define AFX_CODE_H__D5B90563_053E_4256_A61D_7D56F8FB20CF__INCLUDED_ 

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

class CCode   
{ 
public: 
    CString Decode(CString strCode); 
    CString Encode(CString strCode); 
    CCode(); 
    virtual ~CCode(); 

private: 

    CString EnDeCode(CString strCode); 


    int  iLength; 
    char*    szSeed2; 
}; 

#endif // !defined(AFX_CODE_H__D5B90563_053E_4256_A61D_7D56F8FB20CF__INCLUDED_)

// Code.cpp: implementation of the CCode class. 
// 
////////////////////////////////////////////////////////////////////// 

#include "stdafx.h" 
#include "DecodeEncode.h" 
#include "Code.h" 

#ifdef _DEBUG 
#undef THIS_FILE 
static char THIS_FILE[]=__FILE__; 
#define new DEBUG_NEW 
#endif 

////////////////////////////////////////////////////////////////////// 
// Construction/Destruction 
////////////////////////////////////////////////////////////////////// 

CCode::CCode() 
{ 
  
    iLength = 0; 

    char strTemp[60] ={0x04,0x02,0x06,0x05,0x01,0x09,0x03,0x07,0x08,0x02,\ 
  0x04,0x02,0x06,0x05,0x01,0x09,0x03,0x07,0x08,0x02,\ 
  0x04,0x02,0x06,0x05,0x01,0x09,0x03,0x07,0x08,0x02,\ 
  0x04,0x02,0x06,0x05,0x01,0x09,0x03,0x07,0x08,0x02,\ 
  0x04,0x02,0x06,0x05,0x01,0x09,0x03,0x07,0x08,0x02,\ 
  0x04,0x02,0x06,0x05,0x01,0x09,0x03,0x07,0x08,0x02}; 

    szSeed2 = new char[60]; 
    memcpy(szSeed2,strTemp,60); 
  
} 

CCode::~CCode() 
{ 
    delete[] szSeed2; 
} 

CString CCode::Encode(CString strCode) 
{ 
    return EnDeCode(strCode); 
} 

CString CCode::Decode(CString strCode) 
{ 
    return EnDeCode(strCode); 
} 

CString CCode::EnDeCode( CString strCode ) 
{ 
  
    LPCTSTR szSource = (LPCTSTR) strCode; 
  
    iLength = strCode.GetLength(); 


    char *szSeed = new char[iLength]; 

    memcpy(szSeed,szSeed2,iLength); 
   
    char * szSr = new char[iLength]; 
    char *szDes = new char[iLength + 1]; 
    memcpy(szSr,szSource,iLength); 
  
    for(int i = 0;i < iLength;i++) 
    { 
  szDes[i] = szSr[i] ^szSeed[i] ; 
    } 
  
    szDes[iLength] = &#39;\0&#39;; 

    CString strTemp(szDes); 
    delete[] szSr; 
    delete[] szDes; 
    delete[] szSeed; 
  
    return strTemp;   
}

整个程序使用起来很简单，就是调用一下加密解密就行了。

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