Rust Requires Chilkat v11.5.0+

Create JWS Using Private Key on a Smart Card

See more JSON Web Signatures (JWS) Examples

Creates and validates a JSON Web Signature (JWS) using the private key associated with a certificate on a smart card. Rust

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

// Load the certificate from a smart card.
let cert = chilkat::Cert::new();

// Set the smarcard PIN prior to loading
cert.set_smart_card_pin("123456");

// Detect the connected smartcard or USB security token and load the default certificate.
if cert.load_from_smartcard("").is_err() {
    println!("{}", cert.last_error_text());
    return;
}

// Note: Chilkat provides many different ways to load a certificate from a smartcard or USB token,
// such as selecting a certificate if the card contains multiple certificates with private keys,
// or working with lower-level PKCS11 or ScMinidriver API's (both of which Chilkat provides).

// Create the JWS Protected Header
let jws_prot_hdr = chilkat::JsonObject::new();

if cert.is_ecdsa() {
    let _ = jws_prot_hdr.append_string("alg", "ES256");
} else {
    let _ = jws_prot_hdr.append_string("alg", "RS256");
}

let jws = chilkat::Jws::new();

// Set the protected header:
let mut signature_index = 0;
let _ = jws.set_protected_header(signature_index, &jws_prot_hdr);

// Provide the private key via the certificate.
// This requires Chilkat v11.5.0 or greater.
let _ = jws.set_signing_cert(signature_index, &cert);

// Set the payload.
let b_include_bom = false;
let payload_str = "In our village, folks say God crumbles up the old moon into stars.".to_string();
let _ = jws.set_payload(&payload_str, "utf-8", b_include_bom);

// Create the JWS
// By default, the compact serialization is used.
let Ok(jws_compact) = jws.create_jws() else {
    println!("{}", jws.last_error_text());
    return;
};

println!("JWS: {}", jws_compact);

// sample output:
// JWS: eyJhbGciOiJQUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.TRWhwRo5dMv9-8OzrInfJTwmUGYgjLfHk8lqF072ND-FmLWEBnUTOpY8oJXp8FdWw2SalbdOeNlrtlJjwk4XK8Ql2iJ_2qMCtxsvLPhKBOqFoAF4aBvTOEDVJDxf0DaBSiydEEtfTVV2iwBcjWabu5J2XieR5y7QZQtuHsn7T3qKBvCcCejN3Y2oqAT3qMHvu1fTms1r_91wBn_K7Wjd9UkZ1n02qQcUHJznR_OF2BgN7_KWIDAF9ZS9keoju2NPpPelO4yxa2XUPnehY3G7dHKoCxUEQR4d2Xc5voqDASTVCDqQS4PVOZdvT3Ein6-SanAlCwbWBbkvT8g6-5PImQ

// Now load the JWS, validate, and recover the original text.
let jws2 = chilkat::Jws::new();

// Load the JWS.
let _ = jws2.load_jws(&jws_compact).is_ok();

let pub_key = chilkat::PublicKey::new();
let _ = cert.get_public_key(&pub_key);

// Set the public key used for validation.
signature_index = 0;
let _ = jws2.set_public_key(signature_index, &pub_key);

// Validate the 1st (and only) signature at index 0..
let v = jws2.validate(signature_index);
if v < 0 {
    // Perhaps Chilkat was not unlocked or the trial expired..
    println!("Method call failed for some other reason.");
    println!("{}", jws2.last_error_text());
    return;
}

if v == 0 {
    println!("Invalid signature.  The key was incorrect, the JWS was invalid, or both.");
    return;
}

// If we get here, the signature was validated..
println!("Signature validated.");

// Recover the original content:
println!("{}", jws2.get_payload("utf-8").unwrap_or_default());

// Examine the protected header:

let jose_header = chilkat::JsonObject::new();
if jws2.get_protected_h(signature_index, &jose_header).is_err() {
    println!("{}", jws2.last_error_text());
    return;
}

jose_header.set_emit_compact(false);

println!("Protected (JOSE) header:");
println!("{}", jose_header.emit().unwrap_or_default());

// Output:

// 	Signature validated.
// 	In our village, folks say God crumbles up the old moon into stars.
// 	Protected (JOSE) header:
// 	{ 
// 	  "alg": "RS256"
// 	}