(VB.NET) SII XML Digital Signature

Example for SII XML Digital Signature.

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Dim success As Boolean = True

' Load the XML to be signed.
Dim xmlToSign As New Chilkat.Xml
success = xmlToSign.LoadXmlFile("c:/aaworkarea/eduardo/sii_unsigned.xml")
If (success = False) Then
    Debug.WriteLine(xmlToSign.LastErrorText)
    Exit Sub
End If



' The sample XML to be signed looks like this:

' <?xml version="1.0" encoding="ISO-8859-1"?>
' <EnvioDTE 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" version="1.0">
' <SetDTE ID="SetDocF0T33_20240425_170512">
'  <Caratula version="1.0">
'   <RutEmisor>99999999-4</RutEmisor>
'   <RutEnvia>12345678-6</RutEnvia>
'   <RutReceptor>888888000-K</RutReceptor>
'   <FchResol>2014-08-22</FchResol>
'   <NroResol>80</NroResol>
'   <TmstFirmaEnv>2024-04-25T17:05:13</TmstFirmaEnv>
'   <SubTotDTE>
'    <TpoDTE>33</TpoDTE>
'    <NroDTE>1</NroDTE>
'   </SubTotDTE>
'  </Caratula>
' <DTE version="1.0">
' <Documento ID="F555T55">
' ...
' </Documento>
' </EnvioDTE>


Dim gen As New Chilkat.XmlDSigGen

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

' -------- Reference 1 --------
Dim xml1 As New Chilkat.Xml
xml1.Tag = "Transforms"
xml1.UpdateAttrAt("Transform",True,"Algorithm","http://www.w3.org/TR/2001/REC-xml-c14n-20010315")

gen.AddSameDocRef2("F511T33","sha1",xml1,"")


' Provide a certificate + private key. (PFX password is test123)
Dim cert As New Chilkat.Cert
success = 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"

' Load XML to be signed...
Dim sbXml As New Chilkat.StringBuilder
xmlToSign.GetXmlSb(sbXml)

gen.Behaviors = "IndentedSignature"

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



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

' Save the signed XML to a file.
success = sbXml.WriteFile("c:/temp/qa_output/signedXml.xml","utf-8",False)

Debug.WriteLine(sbXml.GetAsString())

' ----------------------------------------
' Verify the signatures we just produced...
Dim verifier As New Chilkat.XmlDSig
success = verifier.LoadSignatureSb(sbXml)
If (success <> True) Then
    Debug.WriteLine(verifier.LastErrorText)
    Exit Sub
End If


Dim numSigs As Integer = verifier.NumSignatures
Dim verifyIdx As Integer = 0
While verifyIdx < numSigs
    verifier.Selector = verifyIdx
    Dim verified As Boolean = verifier.VerifySignature(True)
    If (verified <> True) Then
        Debug.WriteLine(verifier.LastErrorText)
        Exit Sub
    End If

    verifyIdx = verifyIdx + 1
End While
Debug.WriteLine("All signatures were successfully verified.")