evaqqcrypt.h

qq协议分析辅助

#pragma once
/**
 * The QQ2003C protocol plugin
 *
 * for gaim
 *
 * Copyright (C) 2004 Puzzlebird
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 **************************************************
 * Reorganized by Minmin, 2005-3-27
 **************************************************
 */

#define DECRYPT 0x00
#define ENCRYPT 0x01

class EvaQQCrypt
{
public:
	EvaQQCrypt(void);
	~EvaQQCrypt(void);
	
	static void Encrypt (  
    unsigned char*  instr,
    int             instrlen,
    unsigned char*  key,
    unsigned char*  outstr,
    int*            outstrlen_prt);
	
	static int Decrypt (
    unsigned char*  instr,
    int             instrlen,
    unsigned char*  key,
    unsigned char*  outstr,
    int*            outstrlen_ptr);

	static int qq_crypt (
    unsigned char   flag,
    unsigned char*  instr,
	int             instrlen,
	unsigned char*  key,
	unsigned char*  outstr,
	int*            outstrlen_ptr);

private:
	static void Tea_Encipher(unsigned long *const v, const unsigned long *const k, unsigned long *const w);
	static void Tea_Decipher(unsigned long *const v, const unsigned long *const k, unsigned long *const w);
	static int rand(void);
};