> pool = sha(pool)
I'm curious if there exists such a value of pool that the 'pool == sha(pool)' condition would
be true, effectively turning the rng's period to 0. What is the actual period of such a
generator, the one based on a sha hash? Is there some info to read about this? A proof that
the period is constant for any initial seed values, or a proof that it's not? Any pointers
would be greatly appreciated.
p.s. I understand that the external entropy would (eventually) shift the generator out of the
pit, but I am more concerned about what happens when there is no external entropy available,
on theoretical grounds.