ndes.cpp

DES算法原理及实现,实现了3DES和DES的程序过程

/*
*	 Example code for demostrating how to use des
*    Copyright (C) 2007  Stone
*
*    This program is free software: you can redistribute it and/or modify
*    it under the terms of the GNU General Public License as published by
*    the Free Software Foundation, either version 3 of the License, or
*    (at your option) any later version.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU General Public License for more details.
*
*    You should have received a copy of the GNU General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*    Contact me by [e-mail] 
*
*/
#include "stdafx.h"
#include "des.h"

#include <iostream>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	string text("These codes are open source protected by GPL. Refer to <http://www.gnu.org/licenses/> for more infomation.");
	if (text.length() % 8 != 0)
	{
		text.append(text.length() % 8, ' ');
	}
	
	des ds;//use default key
	cout << "raw data:" << text << endl;
	ds.encrypt((unsigned _int64*)text.c_str(),text.length() / 8);
	cout << "encrypted:" << text << endl;
	ds.decrypt((unsigned _int64*)text.c_str(),text.length() / 8);
	cout << "decrypted:" << text << endl;

	ds.setkey(10921734275);//set to another key
	cout << "raw data:" << text << endl;
	ds.encrypt((unsigned _int64*)text.c_str(),text.length() / 8);
	cout << "encrypted:" << text << endl;
	ds.decrypt((unsigned _int64*)text.c_str(),text.length() / 8);
	cout << "decrypted:" << text << endl;

	return 0;
}