(Node.js) Sign Italian SPID Metadata XML

Demonstrates how to create an XML digital signature for Italian SPID Metadata.

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() {

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

    var success = true;

    // Load the XML to be signed.
    var sbXml = new chilkat.StringBuilder();
    success = sbXml.LoadFile("qa_data/xml_dsig/spid_metadata.xml","utf-8");
    if (success == false) {
        console.log("Failed to load the input file.");
        return;
    }

    // The XML to sign contains XML such as this:

    // <?xml version="1.0" encoding="utf-8"?>
    // <md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" entityID="https://***.it" ID="_AE17AFFF-A600-49D5-B81D-76EEA55B50FF">
    //     <md:SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol" AuthnRequestsSigned="true" WantAssertionsSigned="true">
    //         <md:KeyDescriptor use="signing">
    //             <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
    //                 <ds:X509Data>
    //                     <ds:X509Certificate>MIIF5...</ds:X509Certificate>
    //                 </ds:X509Data>
    //             </ds:KeyInfo>
    //         </md:KeyDescriptor>
    //         <md:KeyDescriptor use="encryption">
    //             <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
    //                 <ds:X509Data>
    //                     <ds:X509Certificate>MIIF5...</ds:X509Certificate>
    //                 </ds:X509Data>
    //             </ds:KeyInfo>
    //         </md:KeyDescriptor>
    //         <md:SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://***.it/it-it/spid/logout"/>
    //         <md:NameIDFormat>urn:oasis:names:tc:SAML:2.0:nameid-format:transient</md:NameIDFormat>
    //         <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://***.it/it-it/spid/loginresp" index="0" isDefault="true"/>
    //         <md:AttributeConsumingService index="1">
    //             <md:ServiceName xml:lang="it">Servizi Online</md:ServiceName>
    //             <md:ServiceDescription xml:lang="it">Accesso ai Servizi Online</md:ServiceDescription>
    //             <md:RequestedAttribute Name="spidCode" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
    //             <md:RequestedAttribute Name="name" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
    //             <md:RequestedAttribute Name="familyName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
    //             <md:RequestedAttribute Name="fiscalNumber" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
    //         </md:AttributeConsumingService>
    //     </md:SPSSODescriptor>
    //     <md:Organization>
    //         <md:OrganizationName xml:lang="it">SomeCompany s.r.l.</md:OrganizationName>
    //         <md:OrganizationDisplayName xml:lang="it">SomeCompany s.r.l.</md:OrganizationDisplayName>
    //         <md:OrganizationURL xml:lang="it">https://***.it</md:OrganizationURL>
    //     </md:Organization>
    // </md:EntityDescriptor>

    var gen = new chilkat.XmlDSigGen();

    gen.SigLocation = "md:EntityDescriptor|md:SPSSODescriptor";
    gen.SigLocationMod = 2;
    gen.SignedInfoCanonAlg = "EXCL_C14N";
    gen.SignedInfoDigestMethod = "sha256";

    // -------- Reference 1 --------
    gen.AddSameDocRef("_AE17AFFF-A600-49D5-B81D-76EEA55B50FF","sha256","EXCL_C14N","","");

    // 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";

    gen.Behaviors = "IndentedSignature,ForceAddEnvelopedSignatureTransform,OmitAlreadyDefinedSigNamespace";

    // 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("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();