[PATCH v2 00/15] SHA-3 library

[Eric Biggers]

On Sat, Oct 25, 2025 at 10:50:17PM -0700, Eric Biggers wrote:
> This series is targeting libcrypto-next.  It can also be retrieved from:
> 
>     git fetch https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git sha3-lib-v2
> 
> This series adds SHA-3 support to lib/crypto/.  This includes support
> for the digest algorithms SHA3-224, SHA3-256, SHA3-384, and SHA3-512,
> and also support for the extendable-output functions SHAKE128 and
> SHAKE256.  The SHAKE128 and SHAKE256 support will be needed by ML-DSA.
> 
> The architecture-optimized SHA-3 code for arm64 and s390 is migrated
> into lib/crypto/.  (The existing s390 code couldn't really be reused, so
> really I rewrote it from scratch.)  This makes the SHA-3 library
> functions be accelerated on these architectures.
> 
> Finally, the sha3-224, sha3-256, sha3-384, and sha3-512 crypto_shash
> algorithms are reimplemented on top of the library API.

I've applied this series to
https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/log/?h=libcrypto-next,
excluding the following 2 patches which are waiting on benchmark results
from the s390 folks:

    lib/crypto: sha3: Support arch overrides of one-shot digest functions
    lib/crypto: s390/sha3: Add optimized one-shot SHA-3 digest functions

I'd be glad to apply those too if they're shown to be worthwhile.

Note: I also reordered the commits in libcrypto-next to put the new
KUnit test suites (blake2b and sha3) last, and to put the AES-GCM
improvements on a separate branch that's merged in.  This will allow
making separate pull requests for the tests and the AES-GCM
improvements, which I think aligns with what Linus had requested before
(https://lore.kernel.org/linux-crypto/CAHk-=wi5d4K+sF2L=tuRW6AopVxO1DDXzstMQaECmU2QHN13KA@mail.gmail.com/).

- Eric