Add SHA-256/512 hash algorithm to crypt(3) (kern/124164)

[Mark Murray]

David Magda writes:
> Is there any chance that kern/124164 [1] could be looked at? The
> included patch has been updated by KIMURA Yasuhiro for 8.1R, and so
> hopefully would be okay for 8.3R (and maybe even -CURRENT).

I've taken this. It will go in CURRENT first. 8.3 seems like a
reasonable later merge.

M
--
Mark R V Murray
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