(VB.NET) Apply 2nd Signature to sii.cl Factura Electrónica (Chile Servicio de Impuestos Internos)

Demonstrates how to apply the 2nd signature an XML invoice according to Chilean Internal Revenue Service regulations.

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

' In this example: Create sii.cl Factura Electr�nica (Chile Servicio de Impuestos Internos)
' We signed XML structured like this:

' <?xml version="1.0" encoding="iso-8859-1"?>
' <DTE version="1.0" xmlns="http://www.sii.cl/SiiDte">
'   <Documento ID="F11T22">
'     ...
'   </Documento>
' </DTE>

' To get a signature like this:
' <?xml version="1.0" encoding="iso-8859-1"?>
' <DTE version="1.0" xmlns="http://www.sii.cl/SiiDte">
'   <Documento ID="F11T22">
'     ...
'   </Documento>
'   <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
'     ..
'   </Signature>
' </DTE>

' Now we wish to wrap the result of the 1st example in the following and sign again:

' <?xml version="1.0" encoding="iso-8859-1"?>
' <EnvioDTE version="1.0" xmlns="http://www.sii.cl/SiiDte" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sii.cl/SiiDte EnvioDTE_v10.xsd">
'     <SetDTE ID="NDTECHILE">
'         <Caratula version="1.0">
'             <RutEmisor>...</RutEmisor>
'             <RutEnvia>...</RutEnvia>
'             <RutReceptor>...</RutReceptor>
'             <FchResol>2014-08-22</FchResol>
'             <NroResol>80</NroResol>
'             <TmstFirmaEnv>2020-07-17T13:19:10</TmstFirmaEnv>
'             <SubTotDTE>
'                 <TpoDTE>34</TpoDTE>
'                 <NroDTE>1</NroDTE>
'             </SubTotDTE>
'         </Caratula>
'         <DTE version="1.0" xmlns="http://www.sii.cl/SiiDte">
'             <Documento ID="F11T22">...</Documento>
'             <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">..</Signature>
'         </DTE>
'     </SetDTE>
' </EnvioDTE>

' The result will be this:

' <?xml version="1.0" encoding="iso-8859-1"?>
' <EnvioDTE version="1.0" xmlns="http://www.sii.cl/SiiDte" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sii.cl/SiiDte EnvioDTE_v10.xsd">
'     <SetDTE ID="NDTECHILE">
'         <Caratula version="1.0">
'             <RutEmisor>...</RutEmisor>
'             <RutEnvia>...</RutEnvia>
'             <RutReceptor>...</RutReceptor>
'             <FchResol>2014-08-22</FchResol>
'             <NroResol>80</NroResol>
'             <TmstFirmaEnv>2020-07-17T13:19:10</TmstFirmaEnv>
'             <SubTotDTE>
'                 <TpoDTE>34</TpoDTE>
'                 <NroDTE>1</NroDTE>
'             </SubTotDTE>
'         </Caratula>
'         <DTE version="1.0" xmlns="http://www.sii.cl/SiiDte">
'             <Documento ID="F11T22">...</Documento>
'             <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">..</Signature>
'         </DTE>
'     </SetDTE>
'     <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">..</Signature>
' </EnvioDTE>


Dim gen As New Chilkat.XmlDSigGen

gen.SigLocation = "EnvioDTE"
gen.SigLocationMod = 0
gen.SigNamespacePrefix = ""
gen.SigNamespaceUri = "http://www.w3.org/2000/09/xmldsig#"
gen.SignedInfoCanonAlg = "C14N"
gen.SignedInfoDigestMethod = "sha1"

' -------- Reference 1 --------
gen.AddSameDocRef("NDTECHILE","sha1","","","")

' Provide a certificate + private key. (PFX password is test123)
Dim cert As New Chilkat.Cert
Dim success As Boolean = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
If (success <> True) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If

gen.SetX509Cert(cert,True)

gen.KeyInfoType = "X509Data+KeyValue"
gen.X509Type = "Certificate"

' Here's the part where we must be very careful not to disturb the existing signature.
' We want to encapsulate the existing signed XML like this:

' <?xml version="1.0" encoding="iso-8859-1"?>
' <EnvioDTE version="1.0" xmlns="http://www.sii.cl/SiiDte" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sii.cl/SiiDte EnvioDTE_v10.xsd">
'     <SetDTE ID="NDTECHILE">
'         <Caratula version="1.0">
'             <RutEmisor>...</RutEmisor>
'             <RutEnvia>...</RutEnvia>
'             <RutReceptor>...</RutReceptor>
'             <FchResol>2014-08-22</FchResol>
'             <NroResol>80</NroResol>
'             <TmstFirmaEnv>2020-07-17T13:19:10</TmstFirmaEnv>
'             <SubTotDTE>
'                 <TpoDTE>34</TpoDTE>
'                 <NroDTE>1</NroDTE>
'             </SubTotDTE>
'         </Caratula>
'         <EXISTING_SIGNED_XML>HERE</EXISTING_SIGNED_XML>
'     </SetDTE>
'     <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">..</Signature>
' </EnvioDTE>


Dim xml As New Chilkat.Xml
xml.Tag = "EnvioDTE"
xml.AddAttribute("version","1.0")
xml.AddAttribute("xmlns","http://www.sii.cl/SiiDte")
xml.AddAttribute("xmlns:xsi","http://www.w3.org/2001/XMLSchema-instance")
xml.AddAttribute("xsi:schemaLocation","http://www.sii.cl/SiiDte EnvioDTE_v10.xsd")
xml.UpdateAttrAt("SetDTE",True,"ID","NDTECHILE")
xml.UpdateAttrAt("SetDTE|Caratula",True,"version","1.0")
xml.UpdateChildContent("SetDTE|Caratula|RutEmisor","...")
xml.UpdateChildContent("SetDTE|Caratula|RutEnvia","...")
xml.UpdateChildContent("SetDTE|Caratula|RutReceptor","...")
xml.UpdateChildContent("SetDTE|Caratula|FchResol","2014-08-22")
xml.UpdateChildContent("SetDTE|Caratula|NroResol","80")
xml.UpdateChildContent("SetDTE|Caratula|TmstFirmaEnv","2020-07-17T13:19:10")
xml.UpdateChildContent("SetDTE|Caratula|SubTotDTE|TpoDTE","34")
xml.UpdateChildContent("SetDTE|Caratula|SubTotDTE|NroDTE","1")
xml.UpdateChildContent("SetDTE|EXISTING_SIGNED_XML","HERE")

Dim sbXml As New Chilkat.StringBuilder
xml.GetXmlSb(sbXml)

' Load our existing signed XML.
' We cannot load it into a Chilkat XML object because we cannot allow anything to change,
' not even indentation or whitespace.
Dim sbExisting As New Chilkat.StringBuilder
sbExisting.LoadFile("qa_data/xml_dsig/sii_cl/signed1.xml","iso-8859-1")

' However, we must remove the XML declarator, and we can trim the whitespace at the very front and back (i.e. whitespace completely outside the document).
Dim numReplaced As Integer = sbExisting.Replace("<?xml version=""1.0"" encoding=""iso-8859-1""?>","")
sbExisting.Trim()

' Insert the existing signed XML into the new XML document to be signed.
numReplaced = sbXml.Replace("<EXISTING_SIGNED_XML>HERE</EXISTING_SIGNED_XML>",sbExisting.GetAsString())

' We now have the XML document ready for the 2nd signature to be applied...

' Make sure we add the "SignExistingSignatures" behavior so that this signature includes the original signature in the digest.
gen.Behaviors = "IndentedSignature,SignExistingSignatures"

' Sign the XML...
success = gen.CreateXmlDSigSb(sbXml)
If (success <> True) Then
    Debug.WriteLine(gen.LastErrorText)
    Exit Sub
End If

' -----------------------------------------------

' Change the XML declarator to indicate iso-8859-1 (because we'll be saving using iso-8859-1)
numReplaced = sbXml.Replace("encoding=""utf-8""?>","encoding=""iso-8859-1""?>")

' Save the signed XML to a file.
success = sbXml.WriteFile("qa_data/xml_dsig/sii_cl/signed2.xml","iso-8859-1",False)

Debug.WriteLine(sbXml.GetAsString())