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diff --git a/lang/qt/src/qgpgmeencryptjob.cpp b/lang/qt/src/qgpgmeencryptjob.cpp
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+++ b/lang/qt/src/qgpgmeencryptjob.cpp
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+/*
+    qgpgmeencryptjob.cpp
+
+    This file is part of qgpgme, the Qt API binding for gpgme
+    Copyright (c) 2004,2007,2008 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 "qgpgmeencryptjob.h"
+
+#include "dataprovider.h"
+
+#include "context.h"
+#include "encryptionresult.h"
+#include "data.h"
+
+#include <QBuffer>
+
+
+#include <cassert>
+
+using namespace QGpgME;
+using namespace GpgME;
+
+QGpgMEEncryptJob::QGpgMEEncryptJob(Context *context)
+    : mixin_type(context),
+      mOutputIsBase64Encoded(false)
+{
+    lateInitialization();
+}
+
+QGpgMEEncryptJob::~QGpgMEEncryptJob() {}
+
+void QGpgMEEncryptJob::setOutputIsBase64Encoded(bool on)
+{
+    mOutputIsBase64Encoded = on;
+}
+
+static QGpgMEEncryptJob::result_type encrypt(Context *ctx, QThread *thread,
+        const std::vector<Key> &recipients,
+        const std::weak_ptr<QIODevice> &plainText_,
+        const std::weak_ptr<QIODevice> &cipherText_,
+        bool alwaysTrust,
+        bool outputIsBsse64Encoded)
+{
+
+    const std::shared_ptr<QIODevice> plainText = plainText_.lock();
+    const std::shared_ptr<QIODevice> cipherText = cipherText_.lock();
+
+    const _detail::ToThreadMover ctMover(cipherText, thread);
+    const _detail::ToThreadMover ptMover(plainText,  thread);
+
+    QGpgME::QIODeviceDataProvider in(plainText);
+    const Data indata(&in);
+
+    const Context::EncryptionFlags eflags =
+        alwaysTrust ? Context::AlwaysTrust : Context::None;
+
+    if (!cipherText) {
+        QGpgME::QByteArrayDataProvider out;
+        Data outdata(&out);
+
+        if (outputIsBsse64Encoded) {
+            outdata.setEncoding(Data::Base64Encoding);
+        }
+
+        const EncryptionResult res = ctx->encrypt(recipients, indata, outdata, eflags);
+        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(cipherText);
+        Data outdata(&out);
+
+        if (outputIsBsse64Encoded) {
+            outdata.setEncoding(Data::Base64Encoding);
+        }
+
+        const EncryptionResult res = ctx->encrypt(recipients, indata, outdata, eflags);
+        Error ae;
+        const QString log = _detail::audit_log_as_html(ctx, ae);
+        return std::make_tuple(res, QByteArray(), log, ae);
+    }
+
+}
+
+static QGpgMEEncryptJob::result_type encrypt_qba(Context *ctx, const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust, bool outputIsBsse64Encoded)
+{
+    const std::shared_ptr<QBuffer> buffer(new QBuffer);
+    buffer->setData(plainText);
+    if (!buffer->open(QIODevice::ReadOnly)) {
+        assert(!"This should never happen: QBuffer::open() failed");
+    }
+    return encrypt(ctx, 0, recipients, buffer, std::shared_ptr<QIODevice>(), alwaysTrust, outputIsBsse64Encoded);
+}
+
+Error QGpgMEEncryptJob::start(const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust)
+{
+    run(std::bind(&encrypt_qba, std::placeholders::_1, recipients, plainText, alwaysTrust, mOutputIsBase64Encoded));
+    return Error();
+}
+
+void QGpgMEEncryptJob::start(const std::vector<Key> &recipients, const std::shared_ptr<QIODevice> &plainText, const std::shared_ptr<QIODevice> &cipherText, bool alwaysTrust)
+{
+    run(std::bind(&encrypt,
+                    std::placeholders::_1, std::placeholders::_2,
+                    recipients,
+                    std::placeholders::_3, std::placeholders::_4,
+                    alwaysTrust,
+                    mOutputIsBase64Encoded),
+        plainText, cipherText);
+}
+
+EncryptionResult QGpgMEEncryptJob::exec(const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust, QByteArray &cipherText)
+{
+    const result_type r = encrypt_qba(context(), recipients, plainText, alwaysTrust, mOutputIsBase64Encoded);
+    cipherText = std::get<1>(r);
+    resultHook(r);
+    return mResult;
+}
+
+void QGpgMEEncryptJob::resultHook(const result_type &tuple)
+{
+    mResult = std::get<0>(tuple);
+}
+
+#if 0
+void QGpgMEEncryptJob::showErrorDialog(QWidget *parent, const QString &caption) const
+{
+    if (mResult.error() && !mResult.error().isCanceled()) {
+        MessageBox::error(parent, mResult, this, caption);
+    }
+}
+#endif
+#include "qgpgmeencryptjob.moc"