(VBScript) Examine KeyInfo Certificate in XML Signature

This example loads signed XML and gets the signing certificate, assuming the certificate is contained in X509Certificate within the KeyInfo.

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.XmlDSig")
set dsig = CreateObject("Chilkat.XmlDSig")
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbXml = CreateObject("Chilkat.StringBuilder")

success = sbXml.LoadFile("c:/aaworkarea/elias/3/face_f09006808443a699d1b.xml","utf-8")
If (success <> 1) Then
    outFile.WriteLine("Failed to load XML file.")
    WScript.Quit
End If

success = dsig.LoadSignatureSb(sbXml)
If (success <> 1) Then
    outFile.WriteLine(dsig.LastErrorText)
    WScript.Quit
End If

' Get the KeyInfo XML.
' xmlKeyInfo is a Chilkat.Xml
Set xmlKeyInfo = dsig.GetKeyInfo()
If (dsig.LastMethodSuccess <> 1) Then
    outFile.WriteLine(dsig.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine(xmlKeyInfo.GetXml())
outFile.WriteLine("----")

' Assuming the X509Certificate is in the KeyInfo, it will look like this:

'   <ds:KeyInfo Id="...">
'     <ds:KeyValue>
'     ...  
'     <ds:X509Data>
'       <ds:X509Certificate>MIIHAz...</ds:X509Certificate>
'     </ds:X509Data>
'   </ds:KeyInfo>
certBase64 = xmlKeyInfo.GetChildContent("*:X509Data|*:X509Certificate")
If (xmlKeyInfo.LastMethodSuccess <> 1) Then
    outFile.WriteLine("No X509Certificate found in the KeyInfo.")
    WScript.Quit
End If

' Load a certificate object w/ the base64.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Cert")
set cert = CreateObject("Chilkat.Cert")
success = cert.LoadFromBase64(certBase64)
If (success <> 1) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

' Examine the cert..
outFile.WriteLine("SubjectDN: " & cert.SubjectDN)
outFile.WriteLine("IssuerDN: " & cert.IssuerDN)
outFile.WriteLine("SerialNumber as Decimal: " & cert.SerialDecimal)


outFile.Close