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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>