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152 lines
4.8 KiB
152 lines
4.8 KiB
/*
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msnchallengehandler.h - Computes a msn challenge response hash key.
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Copyright (c) 2005 by Gregg Edghill <gregg.edghill@gmail.com>
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Kopete (c) 2003-2005 by The Kopete developers <kopete-devel@kde.org>
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Portions taken from
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http://msnpiki.msnfanatic.com/index.php/MSNP11:Challenges
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*************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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*************************************************************************
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*/
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#include "msnchallengehandler.h"
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#include <tqdatastream.h>
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#include <kdebug.h>
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#include <kmdcodec.h>
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MSNChallengeHandler::MSNChallengeHandler(const TQString& productKey, const TQString& productId)
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{
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m_productKey = productKey;
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m_productId = productId;
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}
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MSNChallengeHandler::~MSNChallengeHandler()
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{
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kdDebug(14140) << k_funcinfo << endl;
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}
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TQString MSNChallengeHandler::computeHash(const TQString& challengeString)
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{
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// Step One: THe MD5 Hash.
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// Combine the received challenge string with the product key.
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KMD5 md5((challengeString + m_productKey).utf8());
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TQCString digest = md5.hexDigest();
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kdDebug(14140) << k_funcinfo << "md5: " << digest << endl;
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TQValueVector<Q_INT32> md5Integers(4);
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for(Q_UINT32 i=0; i < md5Integers.count(); i++)
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{
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md5Integers[i] = hexSwap(digest.mid(i*8, 8)).toUInt(0, 16) & 0x7FFFFFFF;
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kdDebug(14140) << k_funcinfo << ("0x" + hexSwap(digest.mid(i*8, 8))) << " " << md5Integers[i] << endl;
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}
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// Step Two: Create the challenge string key
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TQString challengeKey = challengeString + m_productId;
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// Pad to multiple of 8.
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challengeKey = challengeKey.leftJustify(challengeKey.length() + (8 - challengeKey.length() % 8), '0');
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kdDebug(14140) << k_funcinfo << "challenge key: " << challengeKey << endl;
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TQValueVector<Q_INT32> challengeIntegers(challengeKey.length() / 4);
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for(Q_UINT32 i=0; i < challengeIntegers.count(); i++)
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{
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TQString sNum = challengeKey.mid(i*4, 4), sNumHex;
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// Go through the number string, determining the hex equivalent of each value
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// and add that to our new hex string for this number.
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for(uint j=0; j < sNum.length(); j++) {
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sNumHex += TQString::number((int)sNum[j].latin1(), 16);
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}
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// swap because of the byte ordering issue.
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sNumHex = hexSwap(sNumHex);
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// Assign the converted number.
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challengeIntegers[i] = sNumHex.toInt(0, 16);
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kdDebug(14140) << k_funcinfo << sNum << (": 0x"+sNumHex) << " " << challengeIntegers[i] << endl;
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}
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// Step Three: Create the 64-bit hash key.
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// Get the hash key using the specified arrays.
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Q_INT64 key = createHashKey(md5Integers, challengeIntegers);
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kdDebug(14140) << k_funcinfo << "key: " << key << endl;
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// Step Four: Create the final hash key.
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TQString upper = TQString::number(TQString(digest.mid(0, 16)).toULongLong(0, 16)^key, 16);
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if(upper.length() % 16 != 0)
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upper = upper.rightJustify(upper.length() + (16 - upper.length() % 16), '0');
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TQString lower = TQString::number(TQString(digest.mid(16, 16)).toULongLong(0, 16)^key, 16);
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if(lower.length() % 16 != 0)
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lower = lower.rightJustify(lower.length() + (16 - lower.length() % 16), '0');
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return (upper + lower);
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}
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Q_INT64 MSNChallengeHandler::createHashKey(const TQValueVector<Q_INT32>& md5Integers,
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const TQValueVector<Q_INT32>& challengeIntegers)
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{
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kdDebug(14140) << k_funcinfo << "Creating 64-bit key." << endl;
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Q_INT64 magicNumber = 0x0E79A9C1L, high = 0L, low = 0L;
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for(uint i=0; i < challengeIntegers.count(); i += 2)
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{
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Q_INT64 temp = ((challengeIntegers[i] * magicNumber) % 0x7FFFFFFF) + high;
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temp = ((temp * md5Integers[0]) + md5Integers[1]) % 0x7FFFFFFF;
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high = (challengeIntegers[i + 1] + temp) % 0x7FFFFFFF;
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high = ((high * md5Integers[2]) + md5Integers[3]) % 0x7FFFFFFF;
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low += high + temp;
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}
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high = (high + md5Integers[1]) % 0x7FFFFFFF;
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low = (low + md5Integers[3]) % 0x7FFFFFFF;
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TQDataStream buffer(TQByteArray(8), IO_ReadWrite);
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buffer.setByteOrder(TQDataStream::LittleEndian);
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buffer << (Q_INT32)high;
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buffer << (Q_INT32)low;
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buffer.device()->reset();
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buffer.setByteOrder(TQDataStream::BigEndian);
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Q_INT64 key;
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buffer >> key;
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return key;
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}
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TQString MSNChallengeHandler::hexSwap(const TQString& in)
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{
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TQString sHex = in, swapped;
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while(sHex.length() > 0)
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{
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swapped = swapped + sHex.mid(sHex.length() - 2, 2);
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sHex = sHex.remove(sHex.length() - 2, 2);
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}
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return swapped;
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}
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TQString MSNChallengeHandler::productId()
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{
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return m_productId;
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}
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#include "msnchallengehandler.moc"
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