(JavaScript) Get Certificates within XML Signature

Demonstrates how to get the certificates contained within an XML signature.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

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

var sbXml = new CkStringBuilder();

// Load XML containing one or more signatures.
success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.xml","utf-8");
if (success == false) {
    console.log("Failed to load the XML file..");
    return;
}

var dsig = new CkXmlDSig();

// First load the XML containing the signatures to be verified.
// Note that this particular Signature already contains the RSA public key that will be used
// for verification.
success = dsig.LoadSignatureSb(sbXml);
if (success !== true) {
    console.log(dsig.LastErrorText);
    return;
}

// For each signature, verify and also get the certificate(s) contained within each Signature.
var i = 0;
var saCerts = new CkStringArray();
var cert = new CkCert();

console.log("numSignatures = " + dsig.NumSignatures);

while (i < dsig.NumSignatures) {
    // Select the Nth signature by setting the Selector property.
    dsig.Selector = i;

    var bVerifyReferenceDigests = true;
    var bVerified = dsig.VerifySignature(bVerifyReferenceDigests);
    console.log("Signature " + (i+1) + " verified = " + bVerified);

    // Get the certificates embedded in this signature.
    saCerts.Clear();
    success = dsig.GetCerts(saCerts);
    if (success == true) {
        var j = 0;
        while (j < saCerts.Count) {
            success = cert.LoadFromBase64(saCerts.GetString(j));
            if (success == true) {
                console.log("    " + cert.SubjectDN);
            }

            j = j+1;
        }

    }

    i = i+1;
}