:type type: :py:data:`TYPE_RSA` or :py:data:`TYPE_DSA`
        :param bits: The number of bits.
        :type bits: :py:data:`int` ``>= 0``
        :raises TypeError: If :py:data:`type` or :py:data:`bits` isn't
            of the appropriate type.
        :raises ValueError: If the number of bits isn't an integer of
            the appropriate size.
        :return: ``None``
        ú