(VB.NET) Use Installed Cert on Windows for TLS Client Authentication

Demonstrates how to use a certificate that has already been installed on a Windows PC for TLS client authentication.

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'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http

Dim success As Boolean

'  On Windows, a pre-installed certificate can be loaded in a number of different ways.
'  This example loads by the common name:
Dim cert As New Chilkat.Cert
Dim success As Boolean = cert.LoadByCommonName("My ECA Medium Assurance Identity Certificate")
If (success <> True) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


'  Make sure this certificate has a private key available.
'  It should be a private key such that when the certificate was installed, it was marked as "exportable"
'  so that authorized programs are able to access the private key.
If (cert.HasPrivateKey() <> True) Then
    Debug.WriteLine("A private key is needed for TLS client authentication.")
    Debug.WriteLine("This certificate has no private key.")
    Exit Sub
End If


'  Set the certificate to be used for mutual TLS authentication
'  (i.e. sets the client-side certificate for two-way TLS authentication)
success = http.SetSslClientCert(cert)
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If



'  At this point, the HTTP object instance is setup with the client-side cert, and any SSL/TLS
'  connection will automatically use it if the server demands a client-side cert.