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Add some helper functions for computing HMAC-SHA256, HMAC-SHA384, or HMAC-SHA512 values using the crypto library instead of crypto_shash. These will enable some significant simplifications and performance improvements in nvme-auth. Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Keith Busch <kbusch@kernel.org>