Comment 1 for bug 907675

This is currently blocked by https://twistedmatrix.com/trac/ticket/5350 which could be partially fixed by http://twistedmatrix.com/trac/ticket/7413, except Ed25519 which would still need https://github.com/pyca/cryptography/issues/856.

http://twistedmatrix.com/trac/ticket/7693 would also be needed for the pyCA support.