Authentication with geom_eli

[Ivan Voras]

Cyrus Rahman wrote:

> With this in mind, the addition of a less expensive authentication
> algorithm, say a CRC, which would provide still provide a check on the
> channel between geom_eli and the physical disk sectors without the
> overhead of md5 or sha256, would be extremely useful.

I think this discussion was held in relation with ZFS (which by default 
does strong hashing of ALL data ALWAYS) and that somebody concluded from 
experiments that, given the difference in speed between modern CPUs and 
modern drives, there wasn't much difference between using CRC32 and 
using a strong hash.

Of course, on slower / embedded devices the situation is much different.