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/*
* Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
*
* 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 or (at your option)
* version 3 of the License.
*
* 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/>.
*/
#include "KeePass2Writer.h"
#include <QtCore/QFile>
#include "core/Database.h"
#include "core/Endian.h"
#include "crypto/CryptoHash.h"
#include "crypto/Random.h"
#include "format/KeePass2XmlWriter.h"
#include "streams/HashedBlockStream.h"
#include "streams/QtIOCompressor"
#include "streams/SymmetricCipherStream.h"
#define CHECK_RETURN(x) if (!(x)) return;
#define CHECK_RETURN_FALSE(x) if (!(x)) return false;
KeePass2Writer::KeePass2Writer()
: m_error(false)
{
}
void KeePass2Writer::writeDatabase(QIODevice* device, Database* db)
{
m_error = false;
m_errorStr = QString();
m_device = device;
QByteArray masterSeed = Random::randomArray(32);
QByteArray encryptionIV = Random::randomArray(16);
QByteArray startBytes = Random::randomArray(32);
QByteArray endOfHeader = "\r\n\r\n";
CryptoHash hash(CryptoHash::Sha256);
hash.addData(masterSeed);
hash.addData(db->transformedMasterKey());
QByteArray finalKey = hash.result();
CHECK_RETURN(writeData(Endian::int32ToBytes(KeePass2::SIGNATURE_1, KeePass2::BYTEORDER)));
CHECK_RETURN(writeData(Endian::int32ToBytes(KeePass2::SIGNATURE_2, KeePass2::BYTEORDER)));
CHECK_RETURN(writeData(Endian::int32ToBytes(KeePass2::FILE_VERSION, KeePass2::BYTEORDER)));
CHECK_RETURN(writeHeaderField(KeePass2::CipherID, db->cipher().toByteArray()));
CHECK_RETURN(writeHeaderField(KeePass2::CompressionFlags, Endian::int32ToBytes(db->compressionAlgo(), KeePass2::BYTEORDER)));
CHECK_RETURN(writeHeaderField(KeePass2::MasterSeed, masterSeed));
CHECK_RETURN(writeHeaderField(KeePass2::TransformSeed, db->transformSeed()));
CHECK_RETURN(writeHeaderField(KeePass2::TransformRounds, Endian::int64ToBytes(db->transformRounds(), KeePass2::BYTEORDER)));
CHECK_RETURN(writeHeaderField(KeePass2::EncryptionIV, encryptionIV));
CHECK_RETURN(writeHeaderField(KeePass2::StreamStartBytes, startBytes));
CHECK_RETURN(writeHeaderField(KeePass2::EndOfHeader, endOfHeader));
SymmetricCipherStream cipherStream(device, SymmetricCipher::Aes256, SymmetricCipher::Cbc, SymmetricCipher::Encrypt, finalKey, encryptionIV);
cipherStream.open(QIODevice::WriteOnly);
m_device = &cipherStream;
CHECK_RETURN(writeData(startBytes));
HashedBlockStream hashedStream(&cipherStream);
hashedStream.open(QIODevice::WriteOnly);
QScopedPointer<QtIOCompressor> ioCompressor;
if (db->compressionAlgo() == Database::CompressionNone) {
m_device = &hashedStream;
}
else {
ioCompressor.reset(new QtIOCompressor(&hashedStream));
ioCompressor->setStreamFormat(QtIOCompressor::GzipFormat);
ioCompressor->open(QIODevice::WriteOnly);
m_device = ioCompressor.data();
}
KeePass2XmlWriter xmlWriter;
xmlWriter.writeDatabase(m_device, db);
}
bool KeePass2Writer::writeData(const QByteArray& data)
{
if (m_device->write(data) != data.size()) {
m_error = true;
m_errorStr = m_device->errorString();
return false;
}
else {
return true;
}
}
bool KeePass2Writer::writeHeaderField(KeePass2::HeaderFieldID fieldId, const QByteArray& data)
{
QByteArray fieldIdArr;
fieldIdArr[0] = fieldId;
CHECK_RETURN_FALSE(writeData(fieldIdArr));
CHECK_RETURN_FALSE(writeData(Endian::int16ToBytes(data.size(), KeePass2::BYTEORDER)));
CHECK_RETURN_FALSE(writeData(data));
return true;
}
void KeePass2Writer::writeDatabase(const QString& filename, Database* db)
{
QFile file(filename);
file.open(QIODevice::WriteOnly|QIODevice::Truncate);
writeDatabase(&file, db);
}
bool KeePass2Writer::error()
{
return m_error;
}
QString KeePass2Writer::errorString()
{
return m_errorStr;
}
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