Examples - OPC UA Application - Assure presence of own certificate

.NET

C#
VB.NET

// Shows how to assure presence of the own application certificate, and display its thumbprint.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-CSharp .
// Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
// a commercial license in order to use Online Forums, and we reply to every post.

using System;
using OpcLabs.BaseLib.Security.Cryptography.PkiCertificates;
using OpcLabs.EasyOpc.UA.Application;
using OpcLabs.EasyOpc.UA.Application.Extensions;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples.Application._IEasyUAClientServerApplication
{
    class AssureOwnCertificate
    {
        public static void Main1()
        {
            // Obtain the application interface.
            EasyUAApplication application = EasyUAApplication.Instance;
            
            try
            {
                Console.WriteLine("Assuring presence of the own application certificate...");
                bool created = application.AssureOwnCertificate();

                Console.WriteLine(created
                    ? "A new certificate has been created."
                    : "An existing certificate has been found.");

                Console.WriteLine();
                Console.WriteLine("Finding the current application certificate...");
                IPkiCertificate pkiCertificate = application.FindOwnCertificate();

                Console.WriteLine();
                Console.WriteLine($"The thumbprint of the current application certificate is: {pkiCertificate?.Thumbprint}");
            }
            catch (UAException uaException)
            {
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message);
                return;
            }
        }
    }
}

' Shows how to assure presence of the own application certificate, and display its thumbprint.
'
' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBNET .
' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
' a commercial license in order to use Online Forums, and we reply to every post.

Imports OpcLabs.BaseLib.Security.Cryptography.PkiCertificates
Imports OpcLabs.EasyOpc.UA.Application
Imports OpcLabs.EasyOpc.UA.Application.Extensions
Imports OpcLabs.EasyOpc.UA.OperationModel

Namespace Application._IEasyUAClientServerApplication
    Friend Class AssureOwnCertificate
        Public Shared Sub Main1()
            ' Obtain the application interface.
            Dim application As EasyUAApplication = EasyUAApplication.Instance

            Try
                Console.WriteLine("Assuring presence of the own application certificate...")
                Dim created As Boolean = application.AssureOwnCertificate()

                Console.WriteLine(If(created,
                                  "A new certificate has been created.",
                                  "An existing certificate has been found."))

                Console.WriteLine()
                Console.WriteLine("Finding the current application certificate...")
                Dim pkiCertificate As IPkiCertificate = application.FindOwnCertificate()

                Console.WriteLine()
                Console.WriteLine($"The thumbprint of the current application certificate is: {pkiCertificate?.Thumbprint}")
            Catch uaException As UAException
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException.Message)
                Exit Sub
            End Try
        End Sub
    End Class
End Namespace

Python

Python (.NET)

# Shows how to assure presence of the own application certificate, and display its thumbprint.
#
# Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
# OPC client and subscriber examples in Python on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-Python .
# Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
# a commercial license in order to use Online Forums, and we reply to every post.
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc

# Import .NET namespaces.
from OpcLabs.EasyOpc.UA import *
from OpcLabs.EasyOpc.UA.Application import *
from OpcLabs.EasyOpc.UA.Application.Extensions import *
from OpcLabs.EasyOpc.UA.OperationModel import *


# Obtain the application interface.
application = EasyUAApplication.Instance

try:
    print('Assuring presence of the own application certificate...')
    created = IEasyUAClientServerApplicationExtension.AssureOwnCertificate(application)

    print('A new certificate has been created.' if created else 'An existing certificate has been found.')

    print()
    print('Finding the current application certificate...')
    pkiCertificate = IEasyUAClientServerApplicationExtension.FindOwnCertificate(application)

    print()
    print('The thumbprint of the current application certificate is: ',
          None if pkiCertificate is None else pkiCertificate.Thumbprint,
          sep='')
except UAException as uaException:
    print('*** Failure: ' + uaException.GetBaseException().Message)
    exit()

print()
print('Finished.')

Concepts

OPC UA Client-Server Application Service

OPC UA Application

Fundamentals

OPC UA User Authentication (Client)