.

    An X.509 store context is used to carry out the actual verification process
    of a certificate in a described context. For describing such a context, see
    :class:`X509Store`.

    :ivar _store_ctx: The underlying X509_STORE_CTX structure used by this
        instance.  It is dynamically allocated and automatically garbage
        collected.
    :ivar _store: See the ``store`` ``__init__`` parameter.
    :ivar _cert: See the ``certificate`` ``__init__`` parameter.
    :param X509Store store: The certificates which will be trusted for the
        purposes of any verifications.
    :param X509 certificate: The certificate to be verified.
    c