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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://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: 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:
    SshAbstractCryptoFacility();
    void convert(QByteArray &data, quint32 offset, quint32 dataSize) const;
    QByteArray sessionId() const { return m_sessionId; }

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,
        Botan::BlockCipherModePaddingMethod *paddingMethod,
        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;

    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,
        Botan::BlockCipherModePaddingMethod *paddingMethod,
        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,
        Botan::BlockCipherModePaddingMethod *paddingMethod,
        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