public static String encodePassword(@Nullable String password) {
    if (password == null) {
      return "";
    }

    StringBuilder result = new StringBuilder();
    for (int i = 0; i < password.length(); i++) {
      result.append(Integer.toHexString(password.charAt(i) ^ 0xdfaa));
    }
    return result.toString();
  }
public static String encodePassword(@Nullable String password)