Node.js

Sign PDF in the Cloud using AWS CloudHSM

See more Signing in the Cloud Examples

Demonstrates how to sign a PDF using AWS CloudHSM. The signing of the hash happens on a hardware token in AWS CloudHSM. Everything else involving the updating the PDF to add the signature happens locally within Chilkat.

Note: This example requires Chilkat v9.5.0.96 or greater.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    var pkcs11 = new chilkat.Pkcs11();

    // Provide the path to the AWS CloudHSM PKCS11 driver.
    // This example runs on Windows, so we'll provide the CloudHSM DLL.
    // If your code runs on Linux, the CloudHSM driver might be at /opt/cloudhsm/lib/libcloudhsm_pkcs11.so
    pkcs11.SharedLibPath = "C:\\Program Files\\Amazon\\CloudHSM\\lib\\cloudhsm_pkcs11.dll";

    // Your PIN should be a string containing your crypto user's login and password, with a colon char delimiting.
    // See https://docs.aws.amazon.com/cloudhsm/latest/userguide/pkcs11-pin.html
    var pin = "user:password";
    var userType = 1;

    // Establish a PKCS logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
    success = pkcs11.QuickSession(userType,pin);
    if (success == false) {
        console.log(pkcs11.LastErrorText);
        return;
    }

    var cert = new chilkat.Cert();
    success = cert.LoadFromFile("qa_data/certs/myCert.cer");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    // Tell the certificate to link with the PKCS11 session.
    // The cert's private key should be installed on the CloudHSM.
    // If there are multiple private keys on the CloudHSM, then Chilkat will automatically
    // locate and use the private key corresponding to the certificate.
    success = cert.LinkPkcs11(pkcs11);
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    // --------------------------------------------------------------------------
    // At this point, we have the cert to be used for signing.
    // Our PDF signing code is the same as for a cert obtained from any other source..

    var pdf = new chilkat.Pdf();

    // Load a PDF to be signed.
    success = pdf.LoadFile("qa_data/pdf/hello.pdf");
    if (success == false) {
        console.log(pdf.LastErrorText);
        success = pkcs11.CloseSession();
        return;
    }

    var json = new chilkat.JsonObject();

    json.UpdateInt("page",1);
    json.UpdateString("appearance.y","top");
    json.UpdateString("appearance.x","left");
    json.UpdateString("appearance.fontScale","10.0");
    json.UpdateString("signingAlgorithm","pss");
    json.UpdateString("hashAlgorithm","sha256");

    var i = 0;
    json.I = i;
    json.UpdateString("appearance.text[i]","Digitaly signed by: Xyz Widgets, Inc.");
    i = i+1;
    json.I = i;
    json.UpdateString("appearance.text[i]","current_dt");
    i = i+1;
    json.I = i;
    json.UpdateString("appearance.text[i]","blah blah blah");

    // The certificate is internally linked to the Pkcs11 object, which is currently in an authenticated session.
    success = pdf.SetSigningCert(cert);

    success = pdf.SignPdf(json,"qa_output/out.pdf");
    if (success == false) {
        console.log(pdf.LastErrorText);
        success = pkcs11.CloseSession();
        return;
    }

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

    // Revert to an unauthenticated session by calling Logout.
    success = pkcs11.Logout();
    if (success == false) {
        console.log(pkcs11.LastErrorText);
        success = pkcs11.CloseSession();
        return;
    }

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = pkcs11.CloseSession();
    if (success == false) {
        console.log(pkcs11.LastErrorText);
        return;
    }

    console.log("Success.");

}

chilkatExample();