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diff --git a/src/plugins/tls/shared/qdtls_base_p.h b/src/plugins/tls/shared/qdtls_base_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtNetwork module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QDTLS_BASE_P_H
+#define QDTLS_BASE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtNetwork/private/qtnetworkglobal_p.h>
+
+QT_REQUIRE_CONFIG(dtls);
+
+#include <QtNetwork/private/qtlsbackend_p.h>
+
+#include <QtNetwork/qsslconfiguration.h>
+#include <QtNetwork/qsslcipher.h>
+#include <QtNetwork/qsslsocket.h>
+#include <QtNetwork/qssl.h>
+
+#include <QtNetwork/qhostaddress.h>
+
+#include <QtCore/qcryptographichash.h>
+#include <QtCore/qbytearray.h>
+#include <QtCore/qglobal.h>
+#include <QtCore/qstring.h>
+
+QT_BEGIN_NAMESPACE
+
+// This class exists to re-implement the shared error/cookie handling
+// for both QDtls and QDtlsClientVerifier classes. Use it if/when
+// you need it. Backend neutral.
+class QDtlsBasePrivate : virtual public QTlsPrivate::DtlsBase
+{
+public:
+    QDtlsBasePrivate(QSslSocket::SslMode m, const QByteArray &s) : mode(m), secret(s) {}
+    void setDtlsError(QDtlsError code, const QString &description) override;
+    QDtlsError error() const override;
+    QString errorString() const override;
+    void clearDtlsError() override;
+
+    void setConfiguration(const QSslConfiguration &configuration) override;
+    QSslConfiguration configuration() const override;
+
+    bool setCookieGeneratorParameters(const GenParams &) override;
+    GenParams cookieGeneratorParameters() const override;
+
+    static bool isDtlsProtocol(QSsl::SslProtocol protocol);
+
+    QHostAddress remoteAddress;
+    quint16 remotePort = 0;
+    quint16 mtuHint = 0;
+
+    QDtlsError errorCode = QDtlsError::NoError;
+    QString errorDescription;
+    QSslConfiguration dtlsConfiguration;
+    QSslSocket::SslMode mode = QSslSocket::SslClientMode;
+    QSslCipher sessionCipher;
+    QSsl::SslProtocol sessionProtocol = QSsl::UnknownProtocol;
+    QString peerVfyName;
+    QByteArray secret;
+
+#ifdef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
+    QCryptographicHash::Algorithm hashAlgorithm = QCryptographicHash::Sha1;
+#else
+    QCryptographicHash::Algorithm hashAlgorithm = QCryptographicHash::Sha256;
+#endif
+};
+
+QT_END_NAMESPACE
+
+#endif // QDTLS_BASE_P_H