The TKey User-Supplied Secret (USS) feature requires blake2s hashing
to derive app-specific secrets. Add blake2s implementation alongside
the existing blake2b support.
The blake2s implementation is ported from the reference BLAKE2
implementation at https://github.com/BLAKE2/BLAKE2
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
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>
