ChaCha8/12/20 and GEOM ELI tests

[Kimmo Paasiala]

> Depends on the capabilities of the attacker.
>
> To be able to continuously read encrypted sectors for data collection is too much.
>

When talking about disk encryption the first assumption is that the
attacker always has this capability, even with so much power the
attacker shouldn't be able to break the encryption scheme. If he can
then the encryption scheme is not secure.

-Kimmo