(Node.js) SII XML Digital Signature

Example for SII XML Digital Signature.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    var success = true;

    // Load the XML to be signed.
    var xmlToSign = new chilkat.Xml();
    success = xmlToSign.LoadXmlFile("c:/aaworkarea/eduardo/sii_unsigned.xml");
    if (success == false) {
        console.log(xmlToSign.LastErrorText);
        return;
    }

    // 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>

    var gen = 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 --------
    var xml1 = 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)
    var cert = new chilkat.Cert();
    success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
    if (success !== true) {
        console.log(cert.LastErrorText);
        return;
    }

    gen.SetX509Cert(cert,true);

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

    // Load XML to be signed...
    var sbXml = new chilkat.StringBuilder();
    xmlToSign.GetXmlSb(sbXml);

    gen.Behaviors = "IndentedSignature";

    // Sign the XML...
    success = gen.CreateXmlDSigSb(sbXml);
    if (success !== true) {
        console.log(gen.LastErrorText);
        return;
    }

    // -----------------------------------------------

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

    console.log(sbXml.GetAsString());

    // ----------------------------------------
    // Verify the signatures we just produced...
    var verifier = new chilkat.XmlDSig();
    success = verifier.LoadSignatureSb(sbXml);
    if (success !== true) {
        console.log(verifier.LastErrorText);
        return;
    }

    var numSigs = verifier.NumSignatures;
    var verifyIdx = 0;
    while (verifyIdx < numSigs) {
        verifier.Selector = verifyIdx;
        var verified = verifier.VerifySignature(true);
        if (verified !== true) {
            console.log(verifier.LastErrorText);
            return;
        }

        verifyIdx = verifyIdx+1;
    }

    console.log("All signatures were successfully verified.");

}

chilkatExample();