JavaScript

Get PDF Signer Certs

See more PDF Signatures Examples

This example demonstrates how to validate the signatures in a PDF and also shows how to get JavaScript

var success = false;

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

var pdf = new CkPdf();

// Load a PDF that has cryptographic signatures to be validated
success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf");
if (success == false) {
    console.log(pdf.LastErrorText);
    return;
}

// Each time we verify a signature, information about the signature is written into
// sigInfo (replacing whatever sigInfo previously contained).
var sigInfo = new CkJsonObject();

// Iterate over each signature and validate each.
var numSignatures = pdf.NumSignatures;
var validated = false;
var cert = new CkCert();
var i = 0;
while (i < numSignatures) {
    validated = pdf.VerifySignature(i,sigInfo);
    console.log("Signature " + i + " validated: " + validated);

    // After calling VerifySignature, you can get the signer certificate by calling
    // GetSignerCert with the same index. 
    success = pdf.GetSignerCert(i,cert);
    if (success !== false) {
        console.log("PDF signer certificate: " + cert.SubjectDN);
    }

    i = i+1;
}

console.log("Finished.");