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/****************************************************************************
**
** Copyright (C) 2014 Jeremy Lainé <jeremy.laine@m4x.org>
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsslkey.h"
#include "qsslkey_p.h"
#include "qasn1element_p.h"
#include <QtCore/qdatastream.h>
#include <QtCore/qcryptographichash.h>
QT_USE_NAMESPACE
static const quint8 bits_table[256] = {
0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
};
static int numberOfBits(const QByteArray &modulus)
{
int bits = modulus.size() * 8;
for (int i = 0; i < modulus.size(); ++i) {
quint8 b = modulus[i];
bits -= 8;
if (b != 0) {
bits += bits_table[b];
break;
}
}
return bits;
}
static QByteArray deriveKey(QSslKeyPrivate::Cipher cipher, const QByteArray &passPhrase, const QByteArray &iv)
{
QByteArray key;
QCryptographicHash hash(QCryptographicHash::Md5);
hash.addData(passPhrase);
hash.addData(iv);
switch (cipher) {
case QSslKeyPrivate::DesCbc:
key = hash.result().left(8);
break;
case QSslKeyPrivate::DesEde3Cbc:
key = hash.result();
hash.reset();
hash.addData(key);
hash.addData(passPhrase);
hash.addData(iv);
key += hash.result().left(8);
break;
case QSslKeyPrivate::Rc2Cbc:
key = hash.result();
break;
}
return key;
}
void QSslKeyPrivate::clear(bool deep)
{
Q_UNUSED(deep);
isNull = true;
derData.clear();
keyLength = -1;
}
void QSslKeyPrivate::decodeDer(const QByteArray &der, bool deepClear)
{
clear(deepClear);
if (der.isEmpty())
return;
QAsn1Element elem;
if (!elem.read(der) || elem.type() != QAsn1Element::SequenceType)
return;
if (type == QSsl::PublicKey) {
// key info
QDataStream keyStream(elem.value());
if (!elem.read(keyStream) || elem.type() != QAsn1Element::SequenceType)
return;
QVector<QAsn1Element> infoItems = elem.toVector();
if (infoItems.size() < 2 || infoItems[0].type() != QAsn1Element::ObjectIdentifierType)
return;
if (algorithm == QSsl::Rsa) {
if (infoItems[0].toObjectId() != RSA_ENCRYPTION_OID)
return;
// key data
if (!elem.read(keyStream) || elem.type() != QAsn1Element::BitStringType || elem.value().isEmpty())
return;
if (!elem.read(elem.value().mid(1)) || elem.type() != QAsn1Element::SequenceType)
return;
if (!elem.read(elem.value()) || elem.type() != QAsn1Element::IntegerType)
return;
keyLength = numberOfBits(elem.value());
} else if (algorithm == QSsl::Dsa) {
if (infoItems[0].toObjectId() != DSA_ENCRYPTION_OID)
return;
if (infoItems[1].type() != QAsn1Element::SequenceType)
return;
// key params
QVector<QAsn1Element> params = infoItems[1].toVector();
if (params.isEmpty() || params[0].type() != QAsn1Element::IntegerType)
return;
keyLength = numberOfBits(params[0].value());
}
} else {
QVector<QAsn1Element> items = elem.toVector();
if (items.isEmpty())
return;
// version
if (items[0].type() != QAsn1Element::IntegerType || items[0].value().toHex() != "00")
return;
if (algorithm == QSsl::Rsa) {
if (items.size() != 9 || items[1].type() != QAsn1Element::IntegerType)
return;
keyLength = numberOfBits(items[1].value());
} else if (algorithm == QSsl::Dsa) {
if (items.size() != 6 || items[1].type() != QAsn1Element::IntegerType)
return;
keyLength = numberOfBits(items[1].value());
}
}
derData = der;
isNull = false;
}
void QSslKeyPrivate::decodePem(const QByteArray &pem, const QByteArray &passPhrase,
bool deepClear)
{
QMap<QByteArray, QByteArray> headers;
QByteArray data = derFromPem(pem, &headers);
if (headers.value("Proc-Type") == "4,ENCRYPTED") {
QList<QByteArray> dekInfo = headers.value("DEK-Info").split(',');
if (dekInfo.size() != 2) {
clear(deepClear);
return;
}
Cipher cipher;
if (dekInfo.first() == "DES-CBC") {
cipher = DesCbc;
} else if (dekInfo.first() == "DES-EDE3-CBC") {
cipher = DesEde3Cbc;
} else if (dekInfo.first() == "RC2-CBC") {
cipher = Rc2Cbc;
} else {
clear(deepClear);
return;
}
const QByteArray iv = QByteArray::fromHex(dekInfo.last());
const QByteArray key = deriveKey(cipher, passPhrase, iv);
data = decrypt(cipher, data, key, iv);
}
decodeDer(data, deepClear);
}
int QSslKeyPrivate::length() const
{
return keyLength;
}
QByteArray QSslKeyPrivate::toPem(const QByteArray &passPhrase) const
{
QByteArray data;
QMap<QByteArray, QByteArray> headers;
if (type == QSsl::PrivateKey && !passPhrase.isEmpty()) {
// ### use a cryptographically secure random number generator
QByteArray iv;
iv.resize(8);
for (int i = 0; i < iv.size(); ++i)
iv[i] = (qrand() & 0xff);
Cipher cipher = DesEde3Cbc;
const QByteArray key = deriveKey(cipher, passPhrase, iv);
data = encrypt(cipher, derData, key, iv);
headers.insert("Proc-Type", "4,ENCRYPTED");
headers.insert("DEK-Info", "DES-EDE3-CBC," + iv.toHex());
} else {
data = derData;
}
return pemFromDer(data, headers);
}
Qt::HANDLE QSslKeyPrivate::handle() const
{
return opaque;
}
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