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Add HMAC support to the SHA-1 library, again following what was done for SHA-2. Besides providing the basis for a more streamlined "hmac(sha1)" shash, this will also be useful for multiple in-kernel users such as net/sctp/auth.c, net/ipv6/seg6_hmac.c, and security/keys/trusted-keys/trusted_tpm1.c. Those are currently using crypto_shash, but using the library functions would be much simpler. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250712232329.818226-5-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>