`Crypto.Random` and forking the `DRG`

[ibotty]

Am I right, that forking the DRG is just not possible with every DRG in a pure way (i.e. without mixing entropy or using new entropy)?

If so, can you comment on how you envision it to be done? Maybe provide the building blocks to "purely" (but not referential transparent) mix entropy to get two generators or (better) provide a function to do that.

I might not have thought this out though.

[vincenthz]

yes, it's not currently possible for the DRG class itself to fork/split.

You could very easily have a main "seed" generator that would seed temporary generators. i.e. something like this:

let (newDRG, seedGenerator') = withDRG seedGenerator drgNew

If we had a generic 'drgNew' for the DRG class, then you'ld be able to do that for every DRG.
Would that be enough to cover your cases ?

[ibotty]

Yes, a `drgNew` (or `newDRG`) would be enough. That said, after porting the code that triggered that issue to use the `MonadRandom` class, I don't seem to need it anymore.