E*t

Hook up the evented `ENTROPY` to (hopefully) continuously reseed Fortuna's internal accumulator pool.
Check out [here](https://github.com/mirleft/ocaml-tls/blob/ed02fe679a8fd51f1a0a051c0032d67d7bac7b8b/mirage/tls_mirage.ml#L11) -- ideally we would not do that, but somehow the entropy source and the RNG need to connect. And right now neither the RNG nor TLS is a mirage type in itself.

My thinking is that later on, `nocrypto` gets a shim that lets it expose a CSPRNG interface for mirage, functored over the entropy source. Then `attach` would happen in `connect` of this RNG provider, transparently, and you would only see a fully-primed RNG source.

But to do that we need to functor out TLS over the crypto library, and then one half of the crypto library over the RNG (which itself uses the other half), and of course the RNG over the entropy provider.

So in short, no, `attach` should go away but can't quite right now. :smile: