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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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.
*
* $URL$
* $Id$
*
*/
/*
* This code is based on Broken Sword 2.5 engine
*
* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
*
* Licensed under GNU GPL v2
*
*/
// -----------------------------------------------------------------------------
// Includes
// -----------------------------------------------------------------------------
#include "sword25/kernel/md5.h"
#include "sword25/kernel/wincodegenerator.h"
using namespace std;
// -----------------------------------------------------------------------------
// Hilfsfunktionen und Konstanten
// -----------------------------------------------------------------------------
namespace
{
const char SECRET[] = "LSZNRVWQJHITMIEGESJMZAYVKGTCDT";
// -------------------------------------------------------------------------
string EncodeValue(unsigned int Value)
{
string Result;
for (unsigned int i = 0; i < 7; ++i)
{
Result.push_back(65 + Value % 26);
Value /= 26;
}
return Result;
}
}
// -----------------------------------------------------------------------------
string BS_WinCodeGenerator::GetWinCode()
{
// Die System-ID generieren und als String codieren.
string SystemID = EncodeValue(GetSystemID());
// Den Hashwert der System-ID mit dem geheimen String berechnen.
BS_MD5 md5;
string HashData = SystemID + SECRET;
md5.Update(reinterpret_cast<const unsigned char *>(&HashData[0]), HashData.size());
unsigned char Digest[16];
md5.GetDigest(Digest);
// Die ersten 32-Bit des Digest werden aus dem Digest extrahiert. Zudem wird das oberste Bit ausmaskiert.
// So ist es einfacher den Code serverseitig zu �berpr�fen, da viele Scriptsprachen mit 32-Bit signed integern rechnen.
unsigned int ValidationHash = ((Digest[3] & 0x7f) << 24) + (Digest[2] << 16) + (Digest[1] << 8) + Digest[0];
// Der Code besteht aus der codierten System-ID und dem codierten Hash.
return SystemID + EncodeValue(ValidationHash);
}
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