VBScript

Add EncapsulatedTimestamp to Already-Signed XML

See more XML Digital Signatures Examples

Demonstrates how to add an EncapsulatedTimestamp to an existing XML signature.

Note: This example requires Chilkat v9.5.0.90 or greater.

VBScript

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

success = 0

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

' Note: We cannot load the already-signed XML into a Chilkat XML object because it would re-format the XML when re-emitted.
' (i.e. indentation and whitespace could change, and it would invalidate the existing signature.)
' We must use a StringBuilder.
set sbXml = CreateObject("Chilkat.StringBuilder")
success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/encapsulatedTimestamp_not_yet_added.xml","utf-8")
If (success = 0) Then
    outFile.WriteLine("Failed to load the XML file.")
    WScript.Quit
End If

set dsig = CreateObject("Chilkat.XmlDSig")
success = dsig.LoadSignatureSb(sbXml)
If (success = 0) Then
    outFile.WriteLine(dsig.LastErrorText)
    WScript.Quit
End If

If (dsig.HasEncapsulatedTimeStamp() = 1) Then
    outFile.WriteLine("This signed XML already has an EncapsulatedTimeStamp")
    WScript.Quit
End If

' Specify the timestamping authority URL
set json = CreateObject("Chilkat.JsonObject")
success = json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com")
success = json.UpdateBool("timestampToken.requestTsaCert",1)

' Call AddEncapsulatedTimeStamp to add the EncapsulatedTimeStamp to the signature.
' Note: If the signed XML contains multiple signatures, the signature modified is the one 
' indicated by the dsig.Selector property.
set sbOut = CreateObject("Chilkat.StringBuilder")
success = dsig.AddEncapsulatedTimeStamp(json,sbOut)
If (success = 0) Then
    outFile.WriteLine(dsig.LastErrorText)
    WScript.Quit
End If

success = sbOut.WriteFile("qa_output/addedEncapsulatedTimeStamp.xml","utf-8",0)

' The EncapsulatedTimeStamp can be validated when validating the signature by adding the VerifyEncapsulatedTimeStamp
' keyword to UncommonOptions.  See here:

' ----------------------------------------
' Verify the signatures we just produced...
set verifier = CreateObject("Chilkat.XmlDSig")
success = verifier.LoadSignatureSb(sbOut)
If (success <> 1) Then
    outFile.WriteLine(verifier.LastErrorText)
    WScript.Quit
End If

' Add "VerifyEncapsulatedTimeStamp" to the UncommonOptions to also verify any EncapsulatedTimeStamps
verifier.UncommonOptions = "VerifyEncapsulatedTimeStamp"

numSigs = verifier.NumSignatures
verifyIdx = 0
Do While verifyIdx < numSigs
    verifier.Selector = verifyIdx
    verified = verifier.VerifySignature(1)
    If (verified <> 1) Then
        outFile.WriteLine(verifier.LastErrorText)
        WScript.Quit
    End If

    verifyIdx = verifyIdx + 1
Loop
outFile.WriteLine("All signatures were successfully verified.")

outFile.Close