(VBScript) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Http")
set http = CreateObject("Chilkat.Http")

' On Windows, a pre-installed certificate can be loaded in a number of different ways.
' This example loads by the common name:
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Cert")
set cert = CreateObject("Chilkat.Cert")
success = cert.LoadByCommonName("My ECA Medium Assurance Identity Certificate")
If (success <> 1) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
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() <> 1) Then
    outFile.WriteLine("A private key is needed for TLS client authentication.")
    outFile.WriteLine("This certificate has no private key.")
    WScript.Quit
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 <> 1) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
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.

outFile.Close