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diff --git a/lang/qt/src/signjob.h b/lang/qt/src/signjob.h
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+/*
+    signjob.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_SIGNJOB_H__
+#define __KLEO_SIGNJOB_H__
+
+#include "job.h"
+
+#ifdef BUILDING_QGPGME
+# include "global.h"
+#else
+# include <gpgme++/global.h>
+#endif
+
+
+#include <vector>
+#include <memory>
+
+class QByteArray;
+class QIODevice;
+
+namespace GpgME
+{
+class Error;
+class Key;
+class SigningResult;
+}
+
+namespace QGpgME
+{
+
+/**
+   @short An abstract base class for asynchronous signing
+
+   To use a SignJob, first obtain an instance from the CryptoBackend
+   implementation, connect the progress() and result() signals to
+   suitable slots and then start the signing with a call to
+   start(). This call might fail, in which case the SignJob instance
+   will have scheduled it's own destruction with a call to
+   QObject::deleteLater().
+
+   After result() is emitted, the SignJob will schedule it's own
+   destruction by calling QObject::deleteLater().
+*/
+class QGPGME_EXPORT SignJob : public Job
+{
+    Q_OBJECT
+protected:
+    explicit SignJob(QObject *parent);
+public:
+    ~SignJob();
+
+    /**
+       Starts the signing operation. \a signers is the list of keys to
+       sign \a plainText with. Empty (null) keys are ignored.
+    */
+    virtual QGPGME_DEPRECATED_EXPORT GpgME::Error start(const std::vector<GpgME::Key> &signers,
+            const QByteArray &plainText,
+            GpgME::SignatureMode mode) = 0;
+
+    /*!
+      \overload
+
+      If \a signature is non-null the signature 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::vector<GpgME::Key> &signers,
+                       const std::shared_ptr<QIODevice> &plainText,
+                       const std::shared_ptr<QIODevice> &signature,
+                       GpgME::SignatureMode mode) = 0;
+
+    virtual GpgME::SigningResult exec(const std::vector<GpgME::Key> &signers,
+                                      const QByteArray &plainText,
+                                      GpgME::SignatureMode mode,
+                                      QByteArray &signature) = 0;
+
+    /*!
+      This is a hack to request BASE64 output (instead of whatever
+      comes out normally).
+    */
+    virtual void setOutputIsBase64Encoded(bool) = 0;
+
+Q_SIGNALS:
+    void result(const GpgME::SigningResult &result, const QByteArray &signature, const QString &auditLogAsHtml = QString(), const GpgME::Error &auditLogError = GpgME::Error());
+};
+
+}
+
+#endif // __KLEO_SIGNJOB_H__