(Visual Basic 6.0) 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

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

Dim cert As New ChilkatCert

' 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 Long
success = cert.LoadByCommonName("My Certificate ABC")
If (success <> 1) Then
    Debug.Print 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.Print "This certificate does not have a private key available."
    Exit Sub
End If

Dim privKey As PrivateKey

Set privKey = cert.ExportPrivateKey()
If (cert.LastMethodSuccess = 0) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

Dim dkim As New ChilkatDkim

' Load the private key into the DKIM object:
success = dkim.LoadDkimPk(privKey.GetPkcs8Pem(),"")
If (success <> 1) Then
    Debug.Print 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...