Go Requires Chilkat v11.0.0+

SII Chile - FRMT Signature Computation and Add to XML

See more XML Digital Signatures Examples

Compute the FRMT signature and add to the XML. This is the RSA signature of the SHA-1 digest of the "flattened" DD element. Go

    success := false

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

    //  Also see:  Compute the FRMA Signature and Add to XML

    xml := chilkat.NewXml()

    //  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>
    //                      <FRMA algoritmo="SHA1withRSA">...</FRMA>
    //                  </CAF>
    //                  ...
    //              </DD>
    //              ... The FRMT will be added here in another example ...
    //          </TED>
    //    </Documento>
    //  </DTE>

    success = xml.LoadXmlFile("qa_data/xml_dsig/sii_cl/test_1.xml")
    if success == false {
        fmt.Println("Failed to load initial XML file.")
        xml.DisposeXml()
        return
    }

    //  Get a reference to the "DD" element
    ddXml := xml.FindChild("Documento|TED|DD")
    if xml.LastMethodSuccess() == false {
        fmt.Println("Failed to find DD element")
        xml.DisposeXml()
        return
    }

    //   We need to get the "flattened" DD 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), 
    sbFlattened := chilkat.NewStringBuilder()
    ddXml.SetEmitCompact(true)
    ddXml.SetEmitXmlDecl(false)
    ddXml.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.

    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_pkcs8.pem","")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        xml.DisposeXml()
        sbFlattened.DisposeStringBuilder()
        privKey.DisposePrivateKey()
        return
    }

    rsa := chilkat.NewRsa()
    rsa.UsePrivateKey(privKey)

    rsa.SetEncodingMode("base64")
    rsa.SetCharset("iso-8859-1")
    sig := rsa.SignStringENC(*sbFlattened.GetAsString(),"sha1")

    //  Add the FRMT signature element to the XML.
    xml.UpdateChildContent("Documento|TED|FRMT",*sig)
    xml.UpdateAttrAt("Documento|TED|FRMT",true,"algoritmo","SHA1withRSA")

    ddXml.DisposeXml()

    //  See what we have:
    xml.SetEmitCompact(false)
    xml.SetEmitXmlDecl(true)
    fmt.Println(*xml.GetXml())

    xml.DisposeXml()
    sbFlattened.DisposeStringBuilder()
    privKey.DisposePrivateKey()
    rsa.DisposeRsa()