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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\example x509
\ingroup qtopcua-examples
\title Qt OPC UA X509 Support
\examplecategory {Data Processing & I/O}
\brief Shows how to generate keys and certificate signing requests.
This example shows how client applications can generate their own self-signed certificate
or generate a certificate signing request.
\section1 Generating RSA key
At first, an RSA key is generated:
\snippet x509/main.cpp 0
The private key can be saved to a file for further usage:
\snippet x509/main.cpp 1
\section1 Generating certificate signing requests
Next, a certificate signing request is created. It is also necessary to set the subject
of the certificate and add all the extensions needed for OPC UA.
\snippet x509/main.cpp 2
Now there are two options: \br
1. When you need to get your certificate signing request signed by a certificate authority,
you have to use the request data.
\snippet x509/main.cpp 3
2. When there is no certificate authority, you have to self-sign the request.
\snippet x509/main.cpp 4
*/