diff --git a/lang/qt/src/qgpgmeencryptjob.cpp b/lang/qt/src/qgpgmeencryptjob.cpp
index cfb8d4ac..c11089ff 100644
--- a/lang/qt/src/qgpgmeencryptjob.cpp
+++ b/lang/qt/src/qgpgmeencryptjob.cpp
@@ -1,224 +1,216 @@
 /*
     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 by Bundesamt für Sicherheit in der Informationstechnik
     Software engineering by Intevation GmbH
     Copyright (c) 2022,2023 g10 Code GmbH
     Software engineering by Ingo Klöcker <dev@ingo-kloecker.de>
 
     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.
 */
 
 #ifdef HAVE_CONFIG_H
  #include "config.h"
 #endif
 
 #include "qgpgmeencryptjob.h"
 
 #include "encryptjob_p.h"
 
 #include "dataprovider.h"
 
 #include "context.h"
 #include "encryptionresult.h"
 #include "data.h"
 
 #include <QBuffer>
 #include <QFileInfo>
 
 #include <cassert>
 
 using namespace QGpgME;
 using namespace GpgME;
 
 namespace
 {
 
 class QGpgMEEncryptJobPrivate : public EncryptJobPrivate
 {
     QGpgMEEncryptJob *q = nullptr;
 
 public:
     QGpgMEEncryptJobPrivate(QGpgMEEncryptJob *qq)
         : q{qq}
     {
     }
 
     ~QGpgMEEncryptJobPrivate() override = default;
 
 private:
     GpgME::Error startIt() override
     {
         Q_ASSERT(!"Not supported by this Job class.");
         return Error::fromCode(GPG_ERR_NOT_SUPPORTED);
     }
 
     void startNow() override
     {
         q->run();
     }
 };
 
 }
 
 QGpgMEEncryptJob::QGpgMEEncryptJob(Context *context)
     : mixin_type(context),
       mOutputIsBase64Encoded(false)
 {
     setJobPrivate(this, std::unique_ptr<QGpgMEEncryptJobPrivate>{new QGpgMEEncryptJobPrivate{this}});
     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_,
         const Context::EncryptionFlags eflags,
         bool outputIsBsse64Encoded,
         Data::Encoding inputEncoding,
         const QString &fileName)
 {
 
     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);
     Data indata(&in);
     indata.setEncoding(inputEncoding);
 
     if (!plainText->isSequential()) {
         indata.setSizeHint(plainText->size());
     }
 
     const auto pureFileName = QFileInfo{fileName}.fileName().toStdString();
     if (!pureFileName.empty()) {
         indata.setFileName(pureFileName.c_str());
     }
 
     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, const Context::EncryptionFlags eflags, bool outputIsBsse64Encoded, Data::Encoding inputEncoding, const QString &fileName)
 {
     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, nullptr, recipients, buffer, std::shared_ptr<QIODevice>(), eflags, outputIsBsse64Encoded, inputEncoding, fileName);
 }
 
 Error QGpgMEEncryptJob::start(const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust)
 {
     run(std::bind(&encrypt_qba, std::placeholders::_1, recipients, plainText,
                   alwaysTrust ? Context::AlwaysTrust : Context::None, mOutputIsBase64Encoded, inputEncoding(), fileName()));
     return Error();
 }
 
 void QGpgMEEncryptJob::start(const std::vector<Key> &recipients, const std::shared_ptr<QIODevice> &plainText,
                              const std::shared_ptr<QIODevice> &cipherText, const Context::EncryptionFlags eflags)
 {
     run(std::bind(&encrypt,
                     std::placeholders::_1, std::placeholders::_2,
                     recipients,
                     std::placeholders::_3, std::placeholders::_4,
                     eflags,
                     mOutputIsBase64Encoded,
                     inputEncoding(),
                     fileName()),
         plainText, cipherText);
 }
 
 EncryptionResult QGpgMEEncryptJob::exec(const std::vector<Key> &recipients, const QByteArray &plainText,
                                         const Context::EncryptionFlags eflags, QByteArray &cipherText)
 {
     const result_type r = encrypt_qba(context(), recipients, plainText, eflags, mOutputIsBase64Encoded, inputEncoding(), fileName());
     cipherText = std::get<1>(r);
     resultHook(r);
     return mResult;
 }
 
 void QGpgMEEncryptJob::start(const std::vector<Key> &recipients, const std::shared_ptr<QIODevice> &plainText, const std::shared_ptr<QIODevice> &cipherText, bool alwaysTrust)
 {
     return start(recipients, plainText, cipherText, alwaysTrust ? Context::AlwaysTrust : Context::None);
 }
 
 EncryptionResult QGpgMEEncryptJob::exec(const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust, QByteArray &cipherText)
 {
     return exec(recipients, plainText, alwaysTrust ? Context::AlwaysTrust : Context::None, cipherText);
 }
 
 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"
diff --git a/lang/qt/src/qgpgmesignencryptjob.cpp b/lang/qt/src/qgpgmesignencryptjob.cpp
index 55513c9f..0f5642a9 100644
--- a/lang/qt/src/qgpgmesignencryptjob.cpp
+++ b/lang/qt/src/qgpgmesignencryptjob.cpp
@@ -1,221 +1,208 @@
 /*
     qgpgmesignencryptjob.cpp
 
     This file is part of qgpgme, the Qt API binding for gpgme
     Copyright (c) 2004, 2007 Klarälvdalens Datakonsult AB
     Copyright (c) 2016 by Bundesamt für Sicherheit in der Informationstechnik
     Software engineering by Intevation GmbH
     Copyright (c) 2022,2023 g10 Code GmbH
     Software engineering by Ingo Klöcker <dev@ingo-kloecker.de>
 
     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.
 */
 
 #ifdef HAVE_CONFIG_H
  #include "config.h"
 #endif
 
 #include "qgpgmesignencryptjob.h"
 
 #include "signencryptjob_p.h"
 
 #include "dataprovider.h"
 
 #include "context.h"
 #include "data.h"
 #include "key.h"
 #include "exception.h"
 
 #include <QBuffer>
 #include <QFileInfo>
 
 #include <cassert>
 
 using namespace QGpgME;
 using namespace GpgME;
 
 namespace
 {
 
 class QGpgMESignEncryptJobPrivate : public SignEncryptJobPrivate
 {
     QGpgMESignEncryptJob *q = nullptr;
 
 public:
     QGpgMESignEncryptJobPrivate(QGpgMESignEncryptJob *qq)
         : q{qq}
     {
     }
 
     ~QGpgMESignEncryptJobPrivate() override = default;
 
 private:
     GpgME::Error startIt() override
     {
         Q_ASSERT(!"Not supported by this Job class.");
         return Error::fromCode(GPG_ERR_NOT_SUPPORTED);
     }
 
     void startNow() override
     {
         q->run();
     }
 };
 
 }
 
 QGpgMESignEncryptJob::QGpgMESignEncryptJob(Context *context)
     : mixin_type(context),
       mOutputIsBase64Encoded(false)
 {
     setJobPrivate(this, std::unique_ptr<QGpgMESignEncryptJobPrivate>{new QGpgMESignEncryptJobPrivate{this}});
     lateInitialization();
 }
 
 QGpgMESignEncryptJob::~QGpgMESignEncryptJob() {}
 
 void QGpgMESignEncryptJob::setOutputIsBase64Encoded(bool on)
 {
     mOutputIsBase64Encoded = on;
 }
 
 static QGpgMESignEncryptJob::result_type sign_encrypt(Context *ctx, QThread *thread, const std::vector<Key> &signers,
                                                       const std::vector<Key> &recipients, const std::weak_ptr<QIODevice> &plainText_,
                                                       const std::weak_ptr<QIODevice> &cipherText_, const Context::EncryptionFlags eflags, bool outputIsBsse64Encoded, const QString &fileName)
 {
     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);
     Data indata(&in);
     if (!plainText->isSequential()) {
         indata.setSizeHint(plainText->size());
     }
 
     const auto pureFileName = QFileInfo{fileName}.fileName().toStdString();
     if (!pureFileName.empty()) {
         indata.setFileName(pureFileName.c_str());
     }
 
     ctx->clearSigningKeys();
     for (const Key &signer : signers) {
         if (!signer.isNull()) {
             if (const Error err = ctx->addSigningKey(signer)) {
                 return std::make_tuple(SigningResult(err), EncryptionResult(), QByteArray(), QString(), Error());
             }
         }
     }
 
     if (!cipherText) {
         QGpgME::QByteArrayDataProvider out;
         Data outdata(&out);
 
         if (outputIsBsse64Encoded) {
             outdata.setEncoding(Data::Base64Encoding);
         }
 
         const std::pair<SigningResult, EncryptionResult> res = ctx->signAndEncrypt(recipients, indata, outdata, eflags);
         Error ae;
         const QString log = _detail::audit_log_as_html(ctx, ae);
         return std::make_tuple(res.first, res.second, out.data(), log, ae);
     } else {
         QGpgME::QIODeviceDataProvider out(cipherText);
         Data outdata(&out);
 
         if (outputIsBsse64Encoded) {
             outdata.setEncoding(Data::Base64Encoding);
         }
 
         const std::pair<SigningResult, EncryptionResult> res = ctx->signAndEncrypt(recipients, indata, outdata, eflags);
         Error ae;
         const QString log = _detail::audit_log_as_html(ctx, ae);
         return std::make_tuple(res.first, res.second, QByteArray(), log, ae);
     }
 
 }
 
 static QGpgMESignEncryptJob::result_type sign_encrypt_qba(Context *ctx, const std::vector<Key> &signers,
                                                           const std::vector<Key> &recipients, const QByteArray &plainText, const Context::EncryptionFlags eflags, bool outputIsBsse64Encoded, const QString &fileName)
 {
     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 sign_encrypt(ctx, nullptr, signers, recipients, buffer, std::shared_ptr<QIODevice>(), eflags, outputIsBsse64Encoded, fileName);
 }
 
 Error QGpgMESignEncryptJob::start(const std::vector<Key> &signers, const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust)
 {
     run(std::bind(&sign_encrypt_qba, std::placeholders::_1, signers, recipients, plainText, alwaysTrust ? Context::AlwaysTrust : Context::None, mOutputIsBase64Encoded, fileName()));
     return Error();
 }
 
 void QGpgMESignEncryptJob::start(const std::vector<Key> &signers, const std::vector<Key> &recipients,
                                  const std::shared_ptr<QIODevice> &plainText, const std::shared_ptr<QIODevice> &cipherText, const Context::EncryptionFlags eflags)
 {
     run(std::bind(&sign_encrypt, std::placeholders::_1, std::placeholders::_2, signers, recipients, std::placeholders::_3, std::placeholders::_4, eflags, mOutputIsBase64Encoded, fileName()), plainText, cipherText);
 }
 
 void QGpgMESignEncryptJob::start(const std::vector<Key> &signers, const std::vector<Key> &recipients, const std::shared_ptr<QIODevice> &plainText, const std::shared_ptr<QIODevice> &cipherText, bool alwaysTrust)
 {
     return start(signers, recipients, plainText, cipherText, alwaysTrust ? Context::AlwaysTrust : Context::None);
 }
 
 std::pair<SigningResult, EncryptionResult> QGpgMESignEncryptJob::exec(const std::vector<Key> &signers, const std::vector<Key> &recipients, const QByteArray &plainText, const Context::EncryptionFlags eflags, QByteArray &cipherText)
 {
     const result_type r = sign_encrypt_qba(context(), signers, recipients, plainText, eflags, mOutputIsBase64Encoded, fileName());
     cipherText = std::get<2>(r);
     resultHook(r);
     return mResult;
 }
 
 std::pair<SigningResult, EncryptionResult> QGpgMESignEncryptJob::exec(const std::vector<Key> &signers, const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust, QByteArray &cipherText)
 {
     return exec(signers, recipients, plainText, alwaysTrust ? Context::AlwaysTrust : Context::None, cipherText);
 }
 
-
-#if 0
-
-TODO port?
-void QGpgMESignEncryptJob::showErrorDialog(QWidget *parent, const QString &caption) const
-{
-    if ((mResult.first.error()  && !mResult.first.error().isCanceled()) ||
-            (mResult.second.error() && !mResult.second.error().isCanceled())) {
-        MessageBox::error(parent, mResult.first, mResult.second, this, caption);
-    }
-}
-#endif
-
 void QGpgMESignEncryptJob::resultHook(const result_type &tuple)
 {
     mResult = std::make_pair(std::get<0>(tuple), std::get<1>(tuple));
 }
 #include "qgpgmesignencryptjob.moc"
diff --git a/lang/qt/src/qgpgmesignjob.cpp b/lang/qt/src/qgpgmesignjob.cpp
index fff242e9..1913157b 100644
--- a/lang/qt/src/qgpgmesignjob.cpp
+++ b/lang/qt/src/qgpgmesignjob.cpp
@@ -1,173 +1,164 @@
 /*
     qgpgmesignjob.cpp
 
     This file is part of qgpgme, the Qt API binding for gpgme
     Copyright (c) 2004,2007,2008 Klarälvdalens Datakonsult AB
     Copyright (c) 2016 by Bundesamt für Sicherheit in der Informationstechnik
     Software engineering by 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.
 */
 
 #ifdef HAVE_CONFIG_H
  #include "config.h"
 #endif
 
 #include "qgpgmesignjob.h"
 
 #include "dataprovider.h"
 
 #include "context.h"
 #include "signingresult.h"
 #include "data.h"
 
 #include <QBuffer>
 
 
 #include <cassert>
 
 using namespace QGpgME;
 using namespace GpgME;
 
 QGpgMESignJob::QGpgMESignJob(Context *context)
     : mixin_type(context),
       mOutputIsBase64Encoded(false)
 {
     lateInitialization();
 }
 
 QGpgMESignJob::~QGpgMESignJob() {}
 
 void QGpgMESignJob::setOutputIsBase64Encoded(bool on)
 {
     mOutputIsBase64Encoded = on;
 }
 
 static QGpgMESignJob::result_type sign(Context *ctx, QThread *thread,
                                        const std::vector<Key> &signers,
                                        const std::weak_ptr<QIODevice> &plainText_,
                                        const std::weak_ptr<QIODevice> &signature_,
                                        SignatureMode mode,
                                        bool outputIsBsse64Encoded)
 {
 
     const std::shared_ptr<QIODevice> plainText = plainText_.lock();
     const std::shared_ptr<QIODevice> signature = signature_.lock();
 
     const _detail::ToThreadMover ptMover(plainText, thread);
     const _detail::ToThreadMover sgMover(signature, thread);
 
     QGpgME::QIODeviceDataProvider in(plainText);
     Data indata(&in);
     if (!plainText->isSequential()) {
         indata.setSizeHint(plainText->size());
     }
 
     ctx->clearSigningKeys();
     for (const Key &signer : signers) {
         if (!signer.isNull()) {
             if (const Error err = ctx->addSigningKey(signer)) {
                 return std::make_tuple(SigningResult(err), QByteArray(), QString(), Error());
             }
         }
     }
 
     if (!signature) {
         QGpgME::QByteArrayDataProvider out;
         Data outdata(&out);
 
         if (outputIsBsse64Encoded) {
             outdata.setEncoding(Data::Base64Encoding);
         }
 
         const SigningResult res = ctx->sign(indata, outdata, mode);
         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(signature);
         Data outdata(&out);
 
         if (outputIsBsse64Encoded) {
             outdata.setEncoding(Data::Base64Encoding);
         }
 
         const SigningResult res = ctx->sign(indata, outdata, mode);
         Error ae;
         const QString log = _detail::audit_log_as_html(ctx, ae);
         return std::make_tuple(res, QByteArray(), log, ae);
     }
 
 }
 
 static QGpgMESignJob::result_type sign_qba(Context *ctx,
         const std::vector<Key> &signers,
         const QByteArray &plainText,
         SignatureMode mode,
         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 sign(ctx, nullptr, signers, buffer, std::shared_ptr<QIODevice>(), mode, outputIsBsse64Encoded);
 }
 
 Error QGpgMESignJob::start(const std::vector<Key> &signers, const QByteArray &plainText, SignatureMode mode)
 {
     run(std::bind(&sign_qba, std::placeholders::_1, signers, plainText, mode, mOutputIsBase64Encoded));
     return Error();
 }
 
 void QGpgMESignJob::start(const std::vector<Key> &signers, const std::shared_ptr<QIODevice> &plainText, const std::shared_ptr<QIODevice> &signature, SignatureMode mode)
 {
     run(std::bind(&sign, std::placeholders::_1, std::placeholders::_2, signers, std::placeholders::_3, std::placeholders::_4, mode, mOutputIsBase64Encoded), plainText, signature);
 }
 
 SigningResult QGpgMESignJob::exec(const std::vector<Key> &signers, const QByteArray &plainText, SignatureMode mode, QByteArray &signature)
 {
     const result_type r = sign_qba(context(), signers, plainText, mode, mOutputIsBase64Encoded);
     signature = std::get<1>(r);
     resultHook(r);
     return mResult;
 }
 
 void QGpgMESignJob::resultHook(const result_type &tuple)
 {
     mResult = std::get<0>(tuple);
 }
 
-#if 0
-TODO port
-void QGpgMESignJob::showErrorDialog(QWidget *parent, const QString &caption) const
-{
-    if (mResult.error() && !mResult.error().isCanceled()) {
-        MessageBox::error(parent, mResult, this, caption);
-    }
-}
-#endif
 #include "qgpgmesignjob.moc"