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diff --git a/lang/qt/src/qgpgmedecryptjob.cpp b/lang/qt/src/qgpgmedecryptjob.cpp
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+++ b/lang/qt/src/qgpgmedecryptjob.cpp
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+/*
+    qgpgmedecryptjob.cpp
+
+    This file is part of qgpgme, the Qt API binding for gpgme
+    Copyright (c) 2004,2008 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.
+*/
+
+#include "qgpgmedecryptjob.h"
+
+#include "dataprovider.h"
+
+#include "context.h"
+#include "decryptionresult.h"
+#include "data.h"
+
+#include <QBuffer>
+
+#include <cassert>
+
+using namespace QGpgME;
+using namespace GpgME;
+
+QGpgMEDecryptJob::QGpgMEDecryptJob(Context *context)
+    : mixin_type(context)
+{
+    lateInitialization();
+}
+
+QGpgMEDecryptJob::~QGpgMEDecryptJob() {}
+
+static QGpgMEDecryptJob::result_type decrypt(Context *ctx, QThread *thread,
+                                             const std::weak_ptr<QIODevice> &cipherText_,
+                                             const std::weak_ptr<QIODevice> &plainText_)
+{
+
+    const std::shared_ptr<QIODevice> cipherText = cipherText_.lock();
+    const std::shared_ptr<QIODevice> plainText = plainText_.lock();
+
+    const _detail::ToThreadMover ctMover(cipherText, thread);
+    const _detail::ToThreadMover ptMover(plainText,  thread);
+
+    QGpgME::QIODeviceDataProvider in(cipherText);
+    const Data indata(&in);
+
+    if (!plainText) {
+        QGpgME::QByteArrayDataProvider out;
+        Data outdata(&out);
+
+        const DecryptionResult res = ctx->decrypt(indata, outdata);
+        Error ae;
+        const QString log = _detail::audit_log_as_html(ctx, ae);
+        return std::make_tuple(res, out.data(), log, ae);
+    } else {
+        QGpgME::QIODeviceDataProvider out(plainText);
+        Data outdata(&out);
+
+        const DecryptionResult res = ctx->decrypt(indata, outdata);
+        Error ae;
+        const QString log = _detail::audit_log_as_html(ctx, ae);
+        return std::make_tuple(res, QByteArray(), log, ae);
+    }
+
+}
+
+static QGpgMEDecryptJob::result_type decrypt_qba(Context *ctx, const QByteArray &cipherText)
+{
+    const std::shared_ptr<QBuffer> buffer(new QBuffer);
+    buffer->setData(cipherText);
+    if (!buffer->open(QIODevice::ReadOnly)) {
+        assert(!"This should never happen: QBuffer::open() failed");
+    }
+    return decrypt(ctx, 0, buffer, std::shared_ptr<QIODevice>());
+}
+
+Error QGpgMEDecryptJob::start(const QByteArray &cipherText)
+{
+    run(std::bind(&decrypt_qba, std::placeholders::_1, cipherText));
+    return Error();
+}
+
+void QGpgMEDecryptJob::start(const std::shared_ptr<QIODevice> &cipherText, const std::shared_ptr<QIODevice> &plainText)
+{
+    run(std::bind(&decrypt, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4), cipherText, plainText);
+}
+
+GpgME::DecryptionResult QGpgME::QGpgMEDecryptJob::exec(const QByteArray &cipherText,
+        QByteArray &plainText)
+{
+    const result_type r = decrypt_qba(context(), cipherText);
+    plainText = std::get<1>(r);
+    resultHook(r);
+    return mResult;
+}
+
+//PENDING(marc) implement showErrorDialog()
+
+void QGpgMEDecryptJob::resultHook(const result_type &tuple)
+{
+    mResult = std::get<0>(tuple);
+}
+
+#include "qgpgmedecryptjob.moc"