Validate a JWS with a Public Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPublicKey, which sets the public key used to validate a signature of a loaded JWS.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

var success = false;

var jws = new CkJws();

//  Load the JWS compact serialization.
var jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>";
success = jws.LoadJws(jwsCompact);
if (success == false) {
    console.log(jws.LastErrorText);
    return;
}

//  The file path is relative to the application's current working directory.  An absolute path
//  may also be used.  Supply the path appropriate to your own environment.
//  Load the signer's public key and set it for validating signature 0.
var pubKey = new CkPublicKey();
success = pubKey.LoadFromFile("qa_data/signer_pubkey.pem");
if (success == false) {
    console.log(pubKey.LastErrorText);
    return;
}

success = jws.SetPublicKey(0,pubKey);
if (success == false) {
    console.log(jws.LastErrorText);
    return;
}

//  Validate the signature.  Validate returns 1 when valid, 0 when not, or a negative value on error.
var v = jws.Validate(0);
if (v < 0) {
    console.log(jws.LastErrorText);
    return;
}

if (v !== 1) {
    console.log("The signature is not valid.");
    return;
}

console.log("The signature is valid.");