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diff --git a/src/plugins/tls/openssl/qtlsbackend_openssl_p.h b/src/plugins/tls/openssl/qtlsbackend_openssl_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 QTLSBACKEND_OPENSSL_P_H
+#define QTLSBACKEND_OPENSSL_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>
+
+#include <QtNetwork/qssldiffiehellmanparameters.h>
+#include <QtNetwork/qsslcertificate.h>
+
+#include <QtNetwork/private/qtlsbackend_p.h>
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qlist.h>
+
+#include <openssl/ssl.h>
+
+QT_BEGIN_NAMESPACE
+
+class QTlsBackendOpenSSL final : public QTlsBackend
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID QTlsBackend_iid)
+    Q_INTERFACES(QTlsBackend)
+
+public:
+
+    static QString getErrorsFromOpenSsl();
+    static void logAndClearErrorQueue();
+    static void clearErrorQueue();
+
+    static bool ensureLibraryLoaded();
+    // Index used in SSL_get_ex_data to get the matching TlsCryptographerOpenSSL:
+    static bool s_libraryLoaded;
+    static bool s_loadedCiphersAndCerts;
+    static int s_indexForSSLExtraData;
+
+    static QString msgErrorsDuringHandshake();
+    static QSslCipher qt_OpenSSL_cipher_to_QSslCipher(const SSL_CIPHER *cipher);
+private:
+
+    QString backendName() const override;
+    bool isValid() const override;
+    long tlsLibraryVersionNumber() const override;
+    QString tlsLibraryVersionString() const override;
+    long tlsLibraryBuildVersionNumber() const override;
+    QString tlsLibraryBuildVersionString() const override;
+
+    void ensureInitialized() const override;
+    void ensureCiphersAndCertsLoaded() const;
+    static void resetDefaultCiphers();
+
+    QList<QSsl::SslProtocol> supportedProtocols() const override;
+    QList<QSsl::SupportedFeature> supportedFeatures() const override;
+    QList<QSsl::ImplementedClass> implementedClasses() const override;
+
+    // QSslKey:
+    QTlsPrivate::TlsKey *createKey() const override;
+
+    // QSslCertificate:
+    QTlsPrivate::X509Certificate *createCertificate() const override;
+    QList<QSslCertificate> systemCaCertificates() const override;
+
+    QTlsPrivate::TlsCryptograph *createTlsCryptograph() const override;
+    QTlsPrivate::DtlsCookieVerifier *createDtlsCookieVerifier() const override;
+    QTlsPrivate::DtlsCryptograph *createDtlsCryptograph(QDtls *q, int mode) const override;
+
+    QTlsPrivate::X509ChainVerifyPtr X509Verifier() const override;
+    QTlsPrivate::X509PemReaderPtr X509PemReader() const override;
+    QTlsPrivate::X509DerReaderPtr X509DerReader() const override;
+    QTlsPrivate::X509Pkcs12ReaderPtr X509Pkcs12Reader() const override;
+
+    // Elliptic curves:
+    QList<int> ellipticCurvesIds() const override;
+    int curveIdFromShortName(const QString &name) const override;
+    int curveIdFromLongName(const QString &name) const override;
+    QString shortNameForId(int cid) const override;
+    QString longNameForId(int cid) const override;
+    bool isTlsNamedCurve(int cid) const override;
+
+    // DH parameters:
+    using DHParams = QSslDiffieHellmanParameters;
+    int dhParametersFromDer(const QByteArray &derData, QByteArray *data) const override;
+    int dhParametersFromPem(const QByteArray &pemData, QByteArray *data) const override;
+
+    void forceAutotestSecurityLevel() override;
+};
+
+QT_END_NAMESPACE
+
+#endif // QTLSBACKEND_OPENSSL_P_H
+
+