Xojo Plugin Requires Chilkat v11.0.0+

SII Chile - FRMA Signature Computation and Add to XML

See more XML Digital Signatures Examples

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

Dim success As Boolean
success = False

//  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

Dim xml As New 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 = False) Then
    System.DebugLog("Failed to load initial XML file.")
    Return
End If

//  Get a reference to the "DA" element
Dim daXml As Chilkat.Xml
daXml = xml.FindChild("Documento|TED|DD|CAF|DA")
If (xml.LastMethodSuccess = False) Then
    System.DebugLog("Failed to find DA element")
    Return
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), 
Dim sbFlattened As New Chilkat.StringBuilder
daXml.EmitCompact = True
daXml.EmitXmlDecl = False
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.

Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_pkcs8.pem","")
If (success = False) Then
    System.DebugLog(privKey.LastErrorText)
    Return
End If

Dim rsa As New Chilkat.Rsa
success = rsa.UsePrivateKey(privKey)

rsa.EncodingMode = "base64"
rsa.Charset = "iso-8859-1"
Dim sig As String
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",True,"algoritmo","SHA1withRSA")

//  See what we have:
xml.EmitCompact = False
xml.EmitXmlDecl = True
System.DebugLog(xml.GetXml())

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