AssureOwnCertificate Method (IEasyUAClientServerApplication)

Assures presence and validity of the own certificate the application is currently configured to use.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Function AssureOwnCertificate( _
   ByVal assureCertificateArguments As UAAssureCertificateArguments _
) As Boolean

'Usage
 
Dim instance As IEasyUAClientServerApplication
Dim assureCertificateArguments As UAAssureCertificateArguments
Dim value As Boolean
 
value = instance.AssureOwnCertificate(assureCertificateArguments)

bool AssureOwnCertificate( 
   UAAssureCertificateArguments assureCertificateArguments
)

bool AssureOwnCertificate( 
   UAAssureCertificateArguments^ assureCertificateArguments
)

Parameters

assureCertificateArguments: Contains arguments for assuring an own OPC UA certificate.
The value of this parameter cannot be null (Nothing in Visual Basic).

Return Value

Returns true if a new certificate has been created. Returns false if an existing certificate was found and accepted as the current own certificate.

Exceptions

Exception Description

Exception	Description
System.ArgumentNullException	A `null` reference (`Nothing` in Visual Basic) is passed to a method that does not accept it as a valid argument. This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.
OpcLabs.EasyOpc.UA.OperationModel.UAException	The OPC UA operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause. This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

System.ArgumentNullException

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

OpcLabs.EasyOpc.UA.OperationModel.UAException

The OPC UA operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause.

This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

Remarks

If the own certificate does not exist in the certificate store prior to the operation, the method creates it. Otherwise, the method also checks whether the instance certificate is present in the trusted peers certificate store, and if it is absent, it copies it there; it then validates the certificate. This is in contrast to the CreateOwnCertificate method, which always creates a new certificate when successful.

Example

CSharp
VB.NET
Python

// 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

# 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.')

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

IEasyUAClientServerApplication Interface
IEasyUAClientServerApplication Members

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