(VBScript) DKIM Signature using Windows Current User Certificate Store

This is a Windows-specific example to load a certificate from the Current User (registry-based) certificate store, and then use the certificate's associated private key for a DKIM signature.

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.Cert")
set cert = CreateObject("Chilkat.Cert")

' The LoadByCommonName method searches the Windows Local Machine and Current User 
' registry-based certificate stores for a certificate having the common name specified. 
' If found, the certificate is loaded and ready for use.
success = cert.LoadByCommonName("My Certificate ABC")
If (success <> 1) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

' The certificate must have an associated private key installed, and it must be a
' private key that has been marked "exportable" when it was originally installed.
If (Not cert.HasPrivateKey()) Then
    outFile.WriteLine("This certificate does not have a private key available.")
    WScript.Quit
End If

' privKey is a Chilkat.PrivateKey
Set privKey = cert.ExportPrivateKey()
If (cert.LastMethodSuccess = 0) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

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

' Load the private key into the DKIM object:
success = dkim.LoadDkimPk(privKey.GetPkcs8Pem(),"")
If (success <> 1) Then
    outFile.WriteLine(dkim.LastErrorText)
    WScript.Quit
End If

' The private key has been loaded into the DKIM object.  See the other DKIM
' examples for guidance on how to create a DKIM signature...


outFile.Close