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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** 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 Digia. For licensing terms and
** conditions see http://www.qt.io/licensing. 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.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#ifndef SSHCRYPTOFACILITY_P_H
#define SSHCRYPTOFACILITY_P_H
#include <botan/botan.h>
#include <QByteArray>
#include <QScopedPointer>
namespace QSsh {
namespace Internal {
class SshKeyExchange;
class SshAbstractCryptoFacility
{
public:
virtual ~SshAbstractCryptoFacility();
void clearKeys();
void recreateKeys(const SshKeyExchange &kex);
QByteArray generateMac(const QByteArray &data, quint32 dataSize) const;
quint32 cipherBlockSize() const { return m_cipherBlockSize; }
quint32 macLength() const { return m_macLength; }
protected:
enum Mode { CbcMode, CtrMode };
SshAbstractCryptoFacility();
void convert(QByteArray &data, quint32 offset, quint32 dataSize) const;
QByteArray sessionId() const { return m_sessionId; }
Botan::Keyed_Filter *makeCtrCipherMode(Botan::BlockCipher *cipher,
const Botan::InitializationVector &iv, const Botan::SymmetricKey &key);
private:
SshAbstractCryptoFacility(const SshAbstractCryptoFacility &);
SshAbstractCryptoFacility &operator=(const SshAbstractCryptoFacility &);
virtual QByteArray cryptAlgoName(const SshKeyExchange &kex) const = 0;
virtual QByteArray hMacAlgoName(const SshKeyExchange &kex) const = 0;
virtual Botan::Keyed_Filter *makeCipherMode(Botan::BlockCipher *cipher,
Mode mode, const Botan::InitializationVector &iv, const Botan::SymmetricKey &key) = 0;
virtual char ivChar() const = 0;
virtual char keyChar() const = 0;
virtual char macChar() const = 0;
QByteArray generateHash(const SshKeyExchange &kex, char c, quint32 length);
void checkInvariant() const;
static Mode getMode(const QByteArray &algoName);
QByteArray m_sessionId;
QScopedPointer<Botan::Pipe> m_pipe;
QScopedPointer<Botan::HMAC> m_hMac;
quint32 m_cipherBlockSize;
quint32 m_macLength;
};
class SshEncryptionFacility : public SshAbstractCryptoFacility
{
public:
void encrypt(QByteArray &data) const;
void createAuthenticationKey(const QByteArray &privKeyFileContents);
QByteArray authenticationAlgorithmName() const;
QByteArray authenticationPublicKey() const { return m_authPubKeyBlob; }
QByteArray authenticationKeySignature(const QByteArray &data) const;
QByteArray getRandomNumbers(int count) const;
~SshEncryptionFacility();
private:
virtual QByteArray cryptAlgoName(const SshKeyExchange &kex) const;
virtual QByteArray hMacAlgoName(const SshKeyExchange &kex) const;
virtual Botan::Keyed_Filter *makeCipherMode(Botan::BlockCipher *cipher,
Mode mode, const Botan::InitializationVector &iv, const Botan::SymmetricKey &key);
virtual char ivChar() const { return 'A'; }
virtual char keyChar() const { return 'C'; }
virtual char macChar() const { return 'E'; }
bool createAuthenticationKeyFromPKCS8(const QByteArray &privKeyFileContents,
QList<Botan::BigInt> &pubKeyParams, QList<Botan::BigInt> &allKeyParams, QString &error);
bool createAuthenticationKeyFromOpenSSL(const QByteArray &privKeyFileContents,
QList<Botan::BigInt> &pubKeyParams, QList<Botan::BigInt> &allKeyParams, QString &error);
static const QByteArray PrivKeyFileStartLineRsa;
static const QByteArray PrivKeyFileStartLineDsa;
static const QByteArray PrivKeyFileEndLineRsa;
static const QByteArray PrivKeyFileEndLineDsa;
QByteArray m_authKeyAlgoName;
QByteArray m_authPubKeyBlob;
QByteArray m_cachedPrivKeyContents;
QScopedPointer<Botan::Private_Key> m_authKey;
mutable Botan::AutoSeeded_RNG m_rng;
};
class SshDecryptionFacility : public SshAbstractCryptoFacility
{
public:
void decrypt(QByteArray &data, quint32 offset, quint32 dataSize) const;
private:
virtual QByteArray cryptAlgoName(const SshKeyExchange &kex) const;
virtual QByteArray hMacAlgoName(const SshKeyExchange &kex) const;
virtual Botan::Keyed_Filter *makeCipherMode(Botan::BlockCipher *cipher,
Mode mode, const Botan::InitializationVector &iv, const Botan::SymmetricKey &key);
virtual char ivChar() const { return 'B'; }
virtual char keyChar() const { return 'D'; }
virtual char macChar() const { return 'F'; }
};
} // namespace Internal
} // namespace QSsh
#endif // SSHCRYPTOFACILITY_P_H
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