?? desdata.h
字號(hào):
/*
* Header file for class of representing des data block
* 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 stoneyrh@163.com
*
*/
#ifndef DESDATA_H
#define DESDATA_H
#include "spbitset.h"
class deskey;
class desdata
{
typedef spbitset<64> data_t;
public:
desdata(void);
~desdata(void);
/*
* encrypt the data by the key
* return the encrypted data
*/
unsigned _int64 encrypt(const unsigned _int64& data,deskey& key);
/*
* decrypt the data by the key
* return the decrypted data
*/
unsigned _int64 decrypt(const unsigned _int64& data,deskey& key);
private:
/*
* the core algorithm of encryption and decryption
*/
template <class iterator>
unsigned _int64 des(const unsigned _int64& data,iterator begin,iterator end);
/*
* decompress 32 bits from 48 bits
*/
void sbox(data_t& right);
private:
static size_t ipb[];
static size_t ipr[];
static size_t epd[];
static size_t ppd[];
static size_t sbx[8][4][16];
//low 32 bits
static data_t lo32;
};
#endif
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