/***************************************************************************
 *   Copyright (C) 2005 by Joris Guisson                                   *
 *   joris.guisson@gmail.com                                               *
 *                                                                         *
 *   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.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ***************************************************************************/
#ifndef MSEENCRYPTEDSERVERAUTHENTICATE_H
#define MSEENCRYPTEDSERVERAUTHENTICATE_H

#include "bigint.h"
#include <peer/serverauthenticate.h>
#include <util/sha1hash.h>

namespace mse
{
class RC4Encryptor;

const Uint32 MAX_SEA_BUF_SIZE = 608 + 20 + 20 + 8 + 4 + 2 + 512 + 2 + 68;
/**
    @author Joris Guisson <joris.guisson@gmail.com>
*/
class EncryptedServerAuthenticate : public bt::ServerAuthenticate
{
    Q_OBJECT
public:
    EncryptedServerAuthenticate(mse::EncryptedPacketSocket::Ptr sock);
    ~EncryptedServerAuthenticate() override;

private Q_SLOTS:
    void onReadyRead() override;

private:
    void handleYA();
    void sendYB();
    void findReq1();
    void calculateSKey();
    void processVC();
    void handlePadC();
    void handleIA();

private:
    enum State {
        WAITING_FOR_YA,
        WAITING_FOR_REQ1,
        FOUND_REQ1,
        FOUND_INFO_HASH,
        WAIT_FOR_PAD_C,
        WAIT_FOR_IA,
        NON_ENCRYPTED_HANDSHAKE,
    };
    BigInt xb, yb, s, ya;
    bt::SHA1Hash skey, info_hash;
    State state;
    Uint8 buf[MAX_SEA_BUF_SIZE];
    Uint32 buf_size;
    Uint32 req1_off;
    Uint32 crypto_provide, crypto_select;
    Uint16 pad_C_len;
    Uint16 ia_len;
    RC4Encryptor *our_rc4;
};

}

#endif
