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EncodeString1.cpp
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109 lines (96 loc) · 2.13 KB
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// EncodeString1.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include <windows.h>
#include <tchar.h>
using namespace std;
void EncodeString(LPCTSTR lpszText, LPTSTR *lpszReturn, LPCTSTR lpszKey)
{
int nTextLen = 0; //字符串长度
char *cPos = NULL;
char *pDest = NULL;
if(lpszReturn) // 加密
{
nTextLen = ::_tcslen(lpszText);
pDest = new char[nTextLen + 3]; // ==\0
}
else // 解密
{
// 查找自定的中止标记
cPos = (LPTSTR)lpszText;
while(true) // 从这里可以看到，除非搜索到我们自定的中止标记，否则会一直搜索下去
{
if(*cPos == '=')
if(cPos[1] == '=')
if(cPos[2] == '\0')
break;
cPos++;
}
if(!cPos) // 没有找到结束标记，也不是加密
return;
nTextLen = cPos - lpszText;
pDest = (LPTSTR)lpszText;
}
int nKeyLen = ::_tcslen(lpszKey);
int i = 0;
int k = 0;
int t = nTextLen;
int cn = 0;
for(int a = 0; a < nKeyLen; a++) // 将密钥所有值加起来
cn += lpszKey[a];
for(; i < nTextLen; i++)
{
if(lpszReturn) // 加密
{
pDest[i] = lpszText[i] + t;
pDest[i] = pDest[i] ^ lpszKey[k];
pDest[i] = pDest[i] ^ cn;
}
else // 解密，顺序与加密时相反
{
pDest[i] = lpszText[i] ^ cn;
pDest[i] = pDest[i] ^ lpszKey[k];
pDest[i] = pDest[i] - t;
}
k++;
t--;
if(k >= nKeyLen)
k = 0;
if(t <= 0)
t = nTextLen;
}
if(!cPos)
{
memcpy(pDest + nTextLen, _T("==\0"), 3 * sizeof(TCHAR));
*lpszReturn = pDest;
}
else
memset(pDest + nTextLen, _T('\0'), sizeof(TCHAR));
}
int main(int argc, char* argv[])
{
system("color A");
char strText[] = "<xml utf-8=1.0>\r\n<hbrx>test</hbrx>\r\n</xml>\r\n";
char *lpszDest = NULL;
cout<<"明文：\r\n";cout<<strText<<endl;
cout<<"========================================"<<endl;
EncodeString(strText , &lpszDest, "hbrx"); // 加密
cout<<"密文：\r\n";cout<<lpszDest<<endl;
cout<<"========================================"<<endl;
EncodeString(lpszDest, NULL, "hbrx"); // 解密
if(lpszDest && *lpszDest)
{
cout<<"解密：\r\n";
cout<<lpszDest<<endl;
delete [] lpszDest;
lpszDest = NULL;
}
else
{
cout<<"解密：\r\n";
cout<<_T("(NULL)")<<endl;
}
system("pause");
return 0;
}