Rust

PKCS11 Find Certificate with Key Usage on Smart Card or USB Token

See more PKCS11 Examples

Demonstrates how to find and return the 1st certificate on a smart card or USB token with a desired intended key usage.

Note: This example requires Chilkat v9.5.0.91 or later.

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();

pkcs11.set_shared_lib_path("aetpkss1.dll");

if pkcs11.initialize().is_err() {
    println!("{}", pkcs11.last_error_text());
    return;
}

// Pass -1 for the slotID to open a session on the first non-empty slot.
let slot_id = -1;

// Open a session.
let read_write = true;
if pkcs11.open_session(slot_id, read_write).is_err() {
    println!("{}", pkcs11.last_error_text());
    return;
}

// Make it an authenticated session by calling Login.
// 
// If we don't authenticate, then we won't be able to see the private keys, and thus
// we won't know which certificates have an associated private key stored on the smart card.

// The smart card PIN is passed to the Login method.
// userType 1 indicates a "Normal User".
let user_type = 1;
let pin = "0000".to_string();
if pkcs11.login(user_type, &pin).is_err() {
    println!("{}", pkcs11.last_error_text());
    let _ = pkcs11.close_session().is_ok();
    return;
}

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

let cert = chilkat::Cert::new();

// Find a certificate with an intended key usage.
// Possible key usages to find are:
// 
// DigitalSignature
// NonRepudiation
// KeyEncipherment
// DataEncipherment
// CertificateSigning
// CrlSigning
// 
// To find a cert having any one of several usages, pass a comma-separated list of usages:
if pkcs11.find_cert("keyUsage", "NonRepudiation,DigitalSignature", &cert).is_ok() {
    println!("Cert with private key: {}", cert.subject_cn());
} else {
    println!("No certificates having the intended key usage were found.");
}

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

// 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.");