}

    private fun extensions(): MutableList<Extension> {
      val result = mutableListOf<Extension>()

      if (maxIntermediateCas != -1) {
        result +=
          Extension(
            id = BASIC_CONSTRAINTS,
            critical = true,
            value =
              BasicConstraints(
                ca = true,
                maxIntermediateCas = maxIntermediateCas.toLong(),
              ),