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Since HMAC support is commonly needed and is fairly simple, include it as a first-class citizen of the SHA-256 library. The API supports both incremental and one-shot computation, and either preparing the key ahead of time or just using a raw key. The implementation is much more streamlined than crypto/hmac.c. I've kept it consistent with the HMAC-SHA384 and HMAC-SHA512 code as much as possible. Testing of these functions will be via sha224_kunit and sha256_kunit, added by a later commit. Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250630160645.3198-9-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>