// Hard coded until I can get it to work
    var uri = "{name=space}.servicebus.windows.net/{topic-or-hub-name}";
    var saName = "{policy-name}";
    var saKey = '{SAS-Key-Use-for-Hash}';

    var encoded = encodeURIComponent(uri);
    var now = new Date();

    // Commented out to compare the Powershell output
    var week = 60*60*24*7;
    var ttl = Math.round(now.getTime() / 1000) + week;
    var ttl = now.getTime() + 300;

    var signature = encoded + '\n' + ttl;


    // These were from the Microsoft NodeJs code, but cannot find comparible objects
    // I think I am missing some UTF-8 String to Array method before calling crypto Hmac
    //   var signatureUTF8 = utf8.encode(signature);
    //   var hash = crypto.createHmac('sha256', saKey).update(signature).digest('base64');

    var _sha256 = crypto.getSHA256();
    _sha256.update(signature);
    _sha256.update(saKey);

    var hash = _sha256.digest64();

    // Output has vaule for debug using proxy headers
    context.targetRequest.headers['Authentication'] = 'SharedAccessSignature sr=' + encoded + '&sig=' +  encodeURIComponent(hash) + '&se=' + ttl + '&skn=' + saName;