Rust

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.

Rust

// 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.

let pkcs11 = chilkat::Pkcs11::new();

// 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.set_shared_lib_path("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
let pin = "user:password".to_string();
let user_type = 1;

// Establish a PKCS logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
if pkcs11.quick_session(user_type, &pin).is_err() {
    println!("{}", pkcs11.last_error_text());
    return;
}

let cert = chilkat::Cert::new();
if cert.load_from_file("qa_data/certs/myCert.cer").is_err() {
    println!("{}", cert.last_error_text());
    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.
if cert.link_pkcs11(&pkcs11).is_err() {
    println!("{}", cert.last_error_text());
    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..

let pdf = chilkat::Pdf::new();

// Load a PDF to be signed.
if pdf.load_file("qa_data/pdf/hello.pdf").is_err() {
    println!("{}", pdf.last_error_text());
    let _ = pkcs11.close_session().is_ok();
    return;
}

let json = chilkat::JsonObject::new();

let _ = json.update_int("page", 1);
let _ = json.update_string("appearance.y", "top");
let _ = json.update_string("appearance.x", "left");
let _ = json.update_string("appearance.fontScale", "10.0");
let _ = json.update_string("signingAlgorithm", "pss");
let _ = json.update_string("hashAlgorithm", "sha256");

let mut i = 0;
json.set_i(i);
let _ = json.update_string("appearance.text[i]", "Digitaly signed by: Xyz Widgets, Inc.");
i = i + 1;
json.set_i(i);
let _ = json.update_string("appearance.text[i]", "current_dt");
i = i + 1;
json.set_i(i);
let _ = json.update_string("appearance.text[i]", "blah blah blah");

// The certificate is internally linked to the Pkcs11 object, which is currently in an authenticated session.
let _ = pdf.set_signing_cert(&cert).is_ok();

if pdf.sign_pdf(&json, "qa_output/out.pdf").is_err() {
    println!("{}", pdf.last_error_text());
    let _ = pkcs11.close_session().is_ok();
    return;
}

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

// Revert to an unauthenticated session by calling Logout.
if pkcs11.logout().is_err() {
    println!("{}", pkcs11.last_error_text());
    let _ = pkcs11.close_session().is_ok();
    return;
}

// When finished, close the session.
// It is important to close the session (memory leaks will occur if the session is not properly closed).
if pkcs11.close_session().is_err() {
    println!("{}", pkcs11.last_error_text());
    return;
}

println!("Success.");