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diff --git a/lang/qt/src/decryptjob.h b/lang/qt/src/decryptjob.h
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+/*
+    decryptjob.h
+
+    This file is part of qgpgme, the Qt API binding for gpgme
+    Copyright (c) 2004, 2007 Klarälvdalens Datakonsult AB
+    Copyright (c) 2016 Intevation GmbH
+
+    QGpgME 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 of the
+    License, or (at your option) any later version.
+
+    QGpgME 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, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of this program with any edition of
+    the Qt library by Trolltech AS, Norway (or with modified versions
+    of Qt that use the same license as Qt), and distribute linked
+    combinations including the two.  You must obey the GNU General
+    Public License in all respects for all of the code used other than
+    Qt.  If you modify this file, you may extend this exception to
+    your version of the file, but you are not obligated to do so.  If
+    you do not wish to do so, delete this exception statement from
+    your version.
+*/
+
+#ifndef __KLEO_DECRYPTJOB_H__
+#define __KLEO_DECRYPTJOB_H__
+
+#include "job.h"
+
+#include <memory>
+
+class QByteArray;
+class QIODevice;
+
+namespace GpgME
+{
+class Error;
+class DecryptionResult;
+}
+
+namespace QGpgME
+{
+
+/**
+   @short An abstract base class for asynchronous decrypters
+
+   To use a DecryptJob, first obtain an instance from the
+   CryptoBackend implementation, connect the progress() and result()
+   signals to suitable slots and then start the decryption with a
+   call to start(). This call might fail, in which case the
+   DecryptJob instance will have scheduled it's own destruction with
+   a call to QObject::deleteLater().
+
+   After result() is emitted, the DecryptJob will schedule it's own
+   destruction by calling QObject::deleteLater().
+*/
+class QGPGME_EXPORT DecryptJob : public Job
+{
+    Q_OBJECT
+protected:
+    explicit DecryptJob(QObject *parent);
+public:
+    ~DecryptJob();
+
+    /**
+       Starts the decryption operation. \a cipherText is the data to
+       decrypt.
+    */
+    virtual QGPGME_DEPRECATED_EXPORT GpgME::Error start(const QByteArray &cipherText) = 0;
+
+    /*!
+      \overload
+
+      If \a plainText is non-null, the plaintext is written
+      there. Otherwise, it will be delivered in the second argument
+      of result().
+
+      \throws GpgME::Exception if starting fails
+    */
+    virtual void start(const std::shared_ptr<QIODevice> &cipherText, const std::shared_ptr<QIODevice> &plainText = std::shared_ptr<QIODevice>()) = 0;
+
+    virtual GpgME::DecryptionResult exec(const QByteArray &cipherText,
+                                         QByteArray &plainText) = 0;
+
+Q_SIGNALS:
+    void result(const GpgME::DecryptionResult &result, const QByteArray &plainText, const QString &auditLogAsHtml = QString(), const GpgME::Error &auditLogError = GpgME::Error());
+};
+
+}
+
+#endif // __KLEO_DECRYPTJOB_H__