Rust Requires Chilkat v11.0.0+

Validate JWS Using HMAC SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) using HMAC SHA-256. Rust

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

// This example takes a JSON signature in compact serialization format,
// and uses a MAC key to validate and recover the protected header and payload.

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

// Set the HMAC key:
let hmac_key = "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow".to_string();
let signature_index = 0;
let _ = jws.set_mac_key(signature_index, &hmac_key, "base64url");

// Load the JWS.
let jws_compact = "eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk".to_string();
let _ = jws.load_jws(&jws_compact).is_ok();

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

if v == 0 {
    println!("Invalid signature.  The MAC 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!("Recovered content:");
println!("{}", jws.get_payload("utf-8").unwrap_or_default());

// Examine the protected header:

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

jose_header.set_emit_compact(false);

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

// Output:

// 	Signature validated.
// 	Recovered content:
// 	{"iss":"joe",
// 	 "exp":1300819380,
// 	 "http://example.com/is_root":true}
// 	Protected (JOSE) header:
// 	{ 
// 	  "typ": "JWT",
// 	  "alg": "HS256"
// 	}