Validate a JWS Signature

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.Validate, which validates exactly one signature, identified by a zero-based index, using the key configured at that same index.

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

// Load the JWS compact serialization.
let jws_compact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>".to_string();
if jws.load_jws(&jws_compact).is_err() {
    println!("{}", jws.last_error_text());
    return;
}

// Provide the key for signature 0 (here an HMAC key).
let base64_key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=".to_string();
if jws.set_mac_key(0, &base64_key, "base64").is_err() {
    println!("{}", jws.last_error_text());
    return;
}

// Validate the signature identified by the zero-based index, using the key configured at that index.
// Validate returns 1 when the signature or MAC is cryptographically valid, 0 when it is not, or a
// negative value on error.
let v = jws.validate(0);
if v < 0 {
    println!("{}", jws.last_error_text());
    return;
}

if v != 1 {
    println!("{}", jws.last_error_text());
    println!("The signature is not valid.");
    return;
}

println!("The signature is valid.");