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.

var success = false;

var jws = new CkJws();

//  Protected header specifying HMAC-SHA256.
var header = new CkJsonObject();
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);