Sign a JWS with an HMAC Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetMacKey, which sets the symmetric MAC key for a signature. The key bytes are supplied in a named encoding such as hex or base64.

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var jws = new chilkat.Jws();

    //  Protected header specifying HMAC-SHA256.
    var header = new chilkat.JsonObject();
    header.UpdateString("alg","HS256");
    success = jws.SetProtectedHeader(0,header);
    if (success == false) {
        console.log(jws.LastErrorText);
        return;
    }

    var bIncludeBom = false;
    success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom);
    if (success == false) {
        console.log(jws.LastErrorText);
        return;
    }

    //  Set the symmetric MAC key for signature 0.  The key bytes are provided in the named encoding (here
    //  base64).  In production, obtain the key from a secure source rather than hard-coding it.
    var base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
    success = jws.SetMacKey(0,base64Key,"base64");
    if (success == false) {
        console.log(jws.LastErrorText);
        return;
    }

    var jwsCompact = jws.CreateJws();
    if (jws.LastMethodSuccess == false) {
        console.log(jws.LastErrorText);
        return;
    }

    console.log(jwsCompact);

}

chilkatExample();