code: public byte[] getCodeBytes (PublicKeyCredentials pkcreds)
      {
          return pkcreds == null || _data.code == null || _data.code.equals(FAILED_TO_SECURE) ?
              null : SecureUtil.xorBytes(StringUtil.unhexlate(_data.code), pkcreds.getSecret());
      }
docs: Returns the code bytes or null for a failed state.