Re: [PATCH v2] lib: Move SipHash into lib/crypto/

[Eric Biggers <ebiggers@kernel.org>]

On Sat, Oct 03, 2026 at 06:28:27PM +0200, Eric Biggers wrote:
> The addition of SipHash to lib/ predated the existence of the
> lib/crypto/ directory.  Since SipHash is a cryptographic algorithm, move
> it from the top-level lib/ directory to lib/crypto/.
> 
> (This does mean HalfSipHash comes with it too, as it's in the same
> files.  But lib/crypto/ still seems like the proper place for both.)
> 
> Specifically:
> 
> - Move both siphash.c and siphash_kunit.c.  Keep the header
>   <linux/siphash.h> as-is for now.
> 
> - Drop the dedicated MAINTAINERS entry for SipHash, as per the
>   suggestion from Jason
>   (https://lore.kernel.org/r/asB7QVFMlgKgbje2@zx2c4.com/).  The C files
>   now just fold up to the "CRYPTO LIBRARY" entry.  Add the header
>   explicitly, as it otherwise would be left unmaintained.
> 
> - Move the kconfig option that controls the KUnit test.  Put
>   "CRYPTO_LIB" in its name and update the prompt and help text to make
>   it consistent with the other crypto library test options.
> 
> - Enable the KUnit test in lib/crypto/.kunitconfig.
> 
> - Link to siphash.rst from the appropriate place in libcrypto-hash.rst.
> 
> - Use obj-y instead of lib-y, for consistency with the fact that
>   currently lib/crypto/ doesn't use kbuild's support for library file
>   goals.  We could keep it as lib-y, but virtually every kernel needs
>   SipHash support anyway (with vsprintf, printk, IPv4, IPv6, etc.
>   depending on it) so there is no practical difference in this case.
> 
> Acked-by: Ard Biesheuvel <ardb@kernel.org>
> Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
> Signed-off-by: Eric Biggers <ebiggers@kernel.org>
> ---
> 
> This patch is targeting libcrypto-next

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/log/?h=libcrypto-next

- Eric