deskey.h

DES算法原理及实现,实现了3DES和DES的程序过程

/*
*	 Header file for class of representing des keys
*    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] 
*
*/
#ifndef DESKEY_H
#define DESKEY_H

#include <vector>
using std::vector;
#include "spbitset.h"

class deskey
{
public:
	typedef spbitset<64> key_t;
	typedef vector<key_t> keys_t;
	typedef keys_t::iterator iterator;
	typedef keys_t::reverse_iterator reverse_iterator;

	deskey(unsigned _int64 key);

	~deskey(void);

	iterator begin()
	{
		return keys.begin();
	}

	iterator end()
	{
		return keys.end();
	}

	reverse_iterator rbegin()
	{
		return keys.rbegin();
	}
	reverse_iterator rend()
	{
		return keys.rend();
	}

	deskey& operator=(const deskey& rhs)
	{
		if (this != &rhs)
		{
			keys = rhs.keys;
		}
		return *this;
	}
private:
	/*
	* gnerate the 16 keys from 64 bits key
	* according to des key generation algorithm
	*/
	void genkey(unsigned _int64 key);
private:
	/*
	* store the 16 keys generated by genkey
	*/
	keys_t keys;

	static size_t pmd1[];
	static size_t loop[];
	static size_t pmd2[];

	/*
	* low 48 bits selector
	*/
	static key_t lo48;
};

#endif