ChaCha8/12/20 and GEOM ELI tests

[rozhuk.im at gmail.com]

> Excuse me, but if you think your physical medium is either 100%
> inaccessible to an adversary, or simply not worth a real attack, and
> the speed is the concern, then why do you want to use any encryption at
> all?

100% is not available yet introduced GELI keys / mounted drive.
AES-XTS is good but too slow.
ChaCha is already enough to cryptography was not a bottleneck.

The case when the disks - local (SATA/SAS/IDE/USB), keys entered / disk is mounted and the attacker has access I do not see because AES-XTS does not help.