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2025-03-20crypto,fs: Separate out hkdf_extract() and hkdf_expand()Hannes Reinecke
Separate out the HKDF functions into a separate module to to make them available to other callers. And add a testsuite to the module with test vectors from RFC 5869 (and additional vectors for SHA384 and SHA512) to ensure the integrity of the algorithm. Signed-off-by: Hannes Reinecke <hare@kernel.org> Acked-by: Eric Biggers <ebiggers@kernel.org> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Keith Busch <kbusch@kernel.org>