The code is cross-ported from BLAKE2 reference implementation
(https://github.com/BLAKE2/BLAKE2).
With minimal change to remove unused macros/features.
Currently there is only one user inside U-boot (btrfs), and since it
only utilize BLAKE2B, all other favors are all removed.
Signed-off-by: Qu Wenruo <wqu@suse.com>
[trini: Rename ROUND to R to avoid clash with <linux/bitops.h>
Signed-off-by: Tom Rini <trini@konsulko.com>
