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�b�~�
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Implementation of a TLS transport (L{ISSLTransport}) as an
L{IProtocol<twisted.internet.interfaces.IProtocol>} layered on top of any
L{ITransport<twisted.internet.interfaces.ITransport>} implementation, based on
U{OpenSSL<http://www.openssl.org>}'s memory BIO features.

L{TLSMemoryBIOFactory} is a L{WrappingFactory} which wraps protocols created by
the factory it wraps with L{TLSMemoryBIOProtocol}.  L{TLSMemoryBIOProtocol}
intercedes between the underlying transport and the wrapped protocol to
implement SSL and TLS.  Typical usage of this module looks like this::

    from twisted.protocols.tls import TLSMemoryBIOFactory
    from twisted.internet.protocol import ServerFactory
    from twisted.internet.ssl import PrivateCertificate
    from twisted.internet import reactor

    from someapplication import ApplicationProtocol

    serverFactory = ServerFactory()
    serverFactory.protocol = ApplicationProtocol
    certificate = PrivateCertificate.loadPEM(certPEMData)
    contextFactory = certificate.options()
    tlsFactory = TLSMemoryBIOFactory(contextFactory, False, serverFactory)
    reactor.listenTCP(12345, tlsFactory)
    reactor.run()

This API offers somewhat more flexibility than
L{twisted.internet.interfaces.IReactorSSL}; for example, a
L{TLSMemoryBIOProtocol} instance can use another instance of
L{TLSMemoryBIOProtocol} as its transport, yielding TLS over TLS - useful to
implement onion routing.  It can also be used to run TLS over unusual
transports, such as UNIX sockets and stdio.
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    Stand-in for producer registered with a L{TLSMemoryBIOProtocol} transport.

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        C{stopProducing} the underlying producer.

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    L{TLSMemoryBIOProtocol} is a protocol wrapper which uses OpenSSL via a
    memory BIO to encrypt bytes written to it before sending them on to the
    underlying transport and decrypts bytes received from the underlying
    transport before delivering them to the wrapped protocol.

    In addition to producer events from the underlying transport, the need to
    wait for reads before a write can proceed means the L{TLSMemoryBIOProtocol}
    may also want to pause a producer.  Pause/resume events are therefore
    merged using the L{_ProducerMembrane} wrapper.  Non-streaming (pull)
    producers are supported by wrapping them with L{_PullToPush}.

    @ivar _tlsConnection: The L{OpenSSL.SSL.Connection} instance which is
        encrypted and decrypting this connection.

    @ivar _lostTLSConnection: A flag indicating whether connection loss has
        already been dealt with (C{True}) or not (C{False}).  TLS disconnection
        is distinct from the underlying connection being lost.

    @ivar _appSendBuffer: application-level (cleartext) data that is waiting to
        be transferred to the TLS buffer, but can't be because the TLS
        connection is handshaking.
    @type _appSendBuffer: L{list} of L{bytes}

    @ivar _connectWrapped: A flag indicating whether or not to call
        C{makeConnection} on the wrapped protocol.  This is for the reactor's
        L{twisted.internet.interfaces.ITLSTransport.startTLS} implementation,
        since it has a protocol which it has already called C{makeConnection}
        on, and which has no interest in a new transport.  See #3821.

    @ivar _handshakeDone: A flag indicating whether or not the handshake is
        known to have completed successfully (C{True}) or not (C{False}).  This
        is used to control error reporting behavior.  If the handshake has not
        completed, the underlying L{OpenSSL.SSL.Error} will be passed to the
        application's C{connectionLost} method.  If it has completed, any
        unexpected L{OpenSSL.SSL.Error} will be turned into a
        L{ConnectionLost}.  This is weird; however, it is simply an attempt at
        a faithful re-implementation of the behavior provided by
        L{twisted.internet.ssl}.

    @ivar _reason: If an unexpected L{OpenSSL.SSL.Error} occurs which causes
        the connection to be lost, it is saved here.  If appropriate, this may
        be used as the reason passed to the application protocol's
        C{connectionLost} method.

    @ivar _producer: The current producer registered via C{registerProducer},
        or L{None} if no producer has been registered or a previous one was
        unregistered.

    @ivar _aborted: C{abortConnection} has been called.  No further data will
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    @type _aborted: L{bool}
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        Return the L{OpenSSL.SSL.Connection} object being used to encrypt and
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        Ask OpenSSL to proceed with a handshake in progress.

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        Try to receive any application-level bytes which are now available
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        Deliver any received bytes to the receive BIO and then read and deliver
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        Called when TLS connection has gone away; tell underlying transport to
        disconnect.

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            C{connectionLost}, or L{None} if the C{reason} that
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        N�)���zUnexpected EOFT)
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        Handle the possible repetition of calls to this method (due to either
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z#TLSMemoryBIOProtocol.connectionLostcCsN|js|jsdS|js|js|��d|_|js#|jdur%|��dSdSdS)zM
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        NT)�
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        Tear down TLS state so that if the connection is aborted mid-handshake
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        Abort the connection during connection setup, giving a reason that
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        N)rUr\rVrrr �failVerification�s	z%TLSMemoryBIOProtocol.failVerificationcCs4t|t�r	td��|jr|jdurdS|�|�dS)z�
        Process the given application bytes and send any resulting TLS traffic
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        Process the given application bytes and send any resulting TLS traffic
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        @see: L{INegotiated.negotiatedProtocol}
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        Construct a L{_ContextFactoryToConnectionFactory} with a
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        force advance parameter checking, since old-style context factories
        don't actually check that their arguments to L{OpenSSL} are correct.

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    @type _creatorInterface: L{zope.interface.interfaces.IInterface}

    @ivar _connectionCreator: a callable which creates an OpenSSL Connection
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        Create a L{TLSMemoryBIOFactory}.

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            here should be:

                1. L{twisted.internet.ssl.CertificateOptions} (if you're
                   writing a server) or the result of
                   L{twisted.internet.ssl.optionsForClientTLS} (if you're
                   writing a client).  If you want security you should really
                   use one of these.

                2. If you really want to implement something yourself, supply a
                   provider of L{IOpenSSLClientConnectionCreator} or
                   L{IOpenSSLServerConnectionCreator}.

                3. If you really have to, supply a
                   L{twisted.internet.ssl.ContextFactory}.  This will likely be
                   deprecated at some point so please upgrade to the new
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        @type contextFactory: L{IOpenSSLClientConnectionCreator} or
            L{IOpenSSLServerConnectionCreator}, or, for compatibility with
            older code, anything implementing
            L{twisted.internet.interfaces.IOpenSSLContextFactory}.  See
            U{https://twistedmatrix.com/trac/ticket/7215} for information on
            the upcoming deprecation of passing a
            L{twisted.internet.ssl.ContextFactory} here.

        @param isClient: Is this a factory for TLS client connections; in other
            words, those that will send a C{ClientHello} greeting?  L{True} if
            so, L{False} otherwise.  This flag determines what interface is
            expected of C{contextFactory}.  If L{True}, C{contextFactory}
            should provide L{IOpenSSLClientConnectionCreator}; otherwise it
            should provide L{IOpenSSLServerConnectionCreator}.
        @type isClient: L{bool}

        @param wrappedFactory: A factory which will create the
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