How to use

sign

method

in

com.eduworks.ec.crypto.EcRsaOaep

/**
 * Sign this object using a private key.
 * Does not check for ownership, objects signed with keys absent from @owner or @reader may be removed.
 *
 * @param {EcPpk} ppk Public private keypair.
 * @method signWith
 */
public void signWith(EcPpk ppk) {
  String signableJson = toSignableJson();
  String signed = EcRsaOaep.sign(ppk, signableJson);
  if (signature != null) {
    for (int i = 0; i < signature.$length(); i++)
      if (signature.$get(i) == signed)
        return;
  } else {
    signature = new Array<String>();
  }
  signature.push(signed);
}

/**
 * Create a signature for a specific identity, authorizing movement of data
 * outside of our control.
 *
 * @param {long}   duration Length of time in milliseconds to authorize
 *                 control.
 * @param {String} server Server that we are authorizing.
 * @param {EcPpk}  ppk Key of the identity to create a signature for
 * @return {Ebac Signature} Signature created
 * @memberOf EcIdentityManager
 * @method createSignature
 * @static
 */
public static EbacSignature createSignature(long duration, String server, EcPpk ppk) {
  EbacSignature s = new EbacSignature();
  s.owner = ppk.toPk().toPem();
  s.expiry = new Date().getTime() + duration;
  s.server = server;
  s.signature = EcRsaOaep.sign(ppk, s.toJson());
  return s;
}