(VB.NET) 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.

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

Dim cert As New 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.
Dim success As Boolean = cert.LoadByCommonName("My Certificate ABC")
If (success <> True) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
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
    Debug.WriteLine("This certificate does not have a private key available.")
    Exit Sub
End If



Dim privKey As Chilkat.PrivateKey

privKey = cert.ExportPrivateKey()
If (cert.LastMethodSuccess = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If



Dim dkim As New Chilkat.Dkim

' Load the private key into the DKIM object:
success = dkim.LoadDkimPk(privKey.GetPkcs8Pem(),"")
If (success <> True) Then
    Debug.WriteLine(dkim.LastErrorText)
    Exit Sub
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...