(VBScript) SII Chile - FRMA Signature Computation and Add to XML

Compute the FRMA signature of a <DA> element enclosed inside a <CAF> element of the XML to be signed.

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

' Also see:  Compute the FRMT Signature and Add to XML

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

' Load the unsigned XML that contains the following:

' <DTE version="1.0">
'   <Documento ID="F60T33">
'         <TED version="1.0">
'             <DD>
' 		...
'                 <CAF version="1.0">
'                     <DA>
' 			...
'                     </DA>
' 			... The FRMA will be added here ...
'                 </CAF>
'                 ...
'             </DD>
'             ... The FRMT will be added here in another example ...
'         </TED>
'   </Documento>
' </DTE>

success = xml.LoadXmlFile("qa_data/xml_dsig/sii_cl/test_0.xml")
If (success = 0) Then
    outFile.WriteLine("Failed to load initial XML file.")
    WScript.Quit
End If

' Get a reference to the "DA" element
' daXml is a Chilkat.Xml
Set daXml = xml.FindChild("Documento|TED|DD|CAF|DA")
If (xml.LastMethodSuccess = 0) Then
    outFile.WriteLine("Failed to find DA element")
    WScript.Quit
End If

'  We need to get the "flattened" DA XML where:
'    - No whitespace between elements.
'    - The 5 pre-defined entities are converted.
'    - The text is encoded in the ISO-8859-1 character set (Latin-1), 
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbFlattened = CreateObject("Chilkat.StringBuilder")
daXml.EmitCompact = 1
daXml.EmitXmlDecl = 0
success = daXml.GetXmlSb(sbFlattened)

' Compute the SHA-1 message digest of the iso-8859-1 byte representation, 
' and sign it with our RSA private key, getting the result in base64 format.

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.PrivateKey")
set privKey = CreateObject("Chilkat.PrivateKey")
success = privKey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_pkcs8.pem","")
If (success = 0) Then
    outFile.WriteLine(privKey.LastErrorText)
    WScript.Quit
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Rsa")
set rsa = CreateObject("Chilkat.Rsa")
success = rsa.ImportPrivateKeyObj(privKey)

rsa.EncodingMode = "base64"
rsa.Charset = "iso-8859-1"
sig = rsa.SignStringENC(sbFlattened.GetAsString(),"sha1")

' Add the FRMA signature element to the XML.
xml.UpdateChildContent "Documento|TED|DD|CAF|FRMA",sig
success = xml.UpdateAttrAt("Documento|TED|DD|CAF|FRMA",1,"algoritmo","SHA1withRSA")

' See what we have:
xml.EmitCompact = 0
xml.EmitXmlDecl = 1
outFile.WriteLine(xml.GetXml())

success = xml.SaveXml("qa_data/xml_dsig/sii_cl/test_1.xml")

outFile.Close