des_encrpty.cpp

开发环境：Visual C++ .net2003 功能介绍：实现DES的加密和解密。

// DES_Encrpty.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "DES.h"
#include "DataDeal.h"

using namespace std;
#define BLOCK1 1024
#define BLOCK2 10

int _tmain(int argc, _TCHAR* argv[])
{
	char ch;
	int i;
	char key[BLOCK2];
	char msg[BLOCK1];
	CDES des;
	CDataDeal dataDeal;

	cout<<"欢迎使用[季旻]的DES加密演示系统"<<endl;
	do
	{
		cout<<"请选择您需要的操作:"<<endl;
		cout<<"[1] 信息不大于8字符加密	[2] 长字符串加密	[3] 文件加密	[4] 文件解密	[0] 退出"<<endl;
		ch = getchar();

		
		switch(ch)
		{
		case '1':
			memset(msg, 0, BLOCK1);
			memset(key, 0, BLOCK2);
			cout<<"请输入需加密的字符串:";
			cin>>msg;			
			
			i = 8;
			while(msg[i]!=0)msg[i++]=0;

			cout<<"密钥:";
			cin>>key;
			
			cout<<"==============================加密前=============================="<<endl;
			cout<<msg<<endl;
			cout<<"==============================加密后=============================="<<endl;
			des.DES_Compute((unsigned char *)msg, (unsigned char *)key);
			cout<<msg<<endl;
			cout<<"==============================解密后=============================="<<endl;
			des.DES_Compute((unsigned char *)msg, (unsigned char *)key, false);
			cout<<msg<<endl;
			break;
		case '2':
			memset(msg, 0, BLOCK1);
			memset(key, 0, BLOCK2);
			cout<<"请输入需加密的字符串:";
			cin>>msg;
			cout<<"密钥:";
			cin>>key;
			cout<<"==============================加密前=============================="<<endl;
			cout<<msg<<endl;
			cout<<"==============================加密后=============================="<<endl;
			dataDeal.EncryptString(msg, key, true);
			cout<<msg<<endl;
			cout<<"==============================解密后=============================="<<endl;
			dataDeal.EncryptString(msg, key, false);
			cout<<msg<<endl;
			break;
		case '3':
			memset(msg, 0, BLOCK1);
			memset(key, 0, BLOCK2);
			cout<<"请输入需加密的文件的文件名:";
			cin>>msg;
			cout<<"密钥:";
			cin>>key;
			cout<<"==============================加密后=============================="<<endl;
			dataDeal.EncryptFile(msg, (unsigned char *)key, true);
			cout<<"结果查看ENCODE_前缀文件名"<<endl;
			break;
		case '4':
			memset(msg, 0, BLOCK1);
			memset(key, 0, BLOCK2);
			cout<<"请输入需解密的文件的文件名:";
			cin>>msg;
			cout<<"密钥:";
			cin>>key;

			cout<<"==============================解密后=============================="<<endl;
			dataDeal.EncryptFile(msg, (unsigned char *)key, false);
			cout<<"结果查看DECODE_前缀文件名"<<endl;
			break;
		case '0':
			return 0;
		default:
			break;
		}

	}while(true);

	return 0;
}