Merge tag 'libcrypto-updates-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux

Pull crypto library updates from Eric Biggers:
"This is the main crypto library pull request

Merge tag 'libcrypto-updates-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux

Pull crypto library updates from Eric Biggers:
"This is the main crypto library pull request for 6.19. It includes:

- Add SHA-3 support to lib/crypto/, including support for both the
hash functions and the extendable-output functions. Reimplement the
existing SHA-3 crypto_shash support on top of the library.

This is motivated mainly by the upcoming support for the ML-DSA
signature algorithm, which needs the SHAKE128 and SHAKE256
functions. But even on its own it's a useful cleanup.

This also fixes the longstanding issue where the
architecture-optimized SHA-3 code was disabled by default.

- Add BLAKE2b support to lib/crypto/, and reimplement the existing
BLAKE2b crypto_shash support on top of the library.

This is motivated mainly by btrfs, which supports BLAKE2b
checksums. With this change, all btrfs checksum algorithms now have
library APIs. btrfs is planned to start just using the library
directly.

This refactor also improves consistency between the BLAKE2b code
and BLAKE2s code. And as usual, it also fixes the issue where the
architecture-optimized BLAKE2b code was disabled by default.

- Add POLYVAL support to lib/crypto/, replacing the existing POLYVAL
support in crypto_shash. Reimplement HCTR2 on top of the library.

This simplifies the code and improves HCTR2 performance. As usual,
it also makes the architecture-optimized code be enabled by
default. The generic implementation of POLYVAL is greatly improved
as well.

- Clean up the BLAKE2s code

- Add FIPS self-tests for SHA-1, SHA-2, and SHA-3"

* tag 'libcrypto-updates-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux: (37 commits)
fscrypt: Drop obsolete recommendation to enable optimized POLYVAL
crypto: polyval - Remove the polyval crypto_shash
crypto: hctr2 - Convert to use POLYVAL library
lib/crypto: x86/polyval: Migrate optimized code into library
lib/crypto: arm64/polyval: Migrate optimized code into library
lib/crypto: polyval: Add POLYVAL library
crypto: polyval - Rename conflicting functions
lib/crypto: x86/blake2s: Use vpternlogd for 3-input XORs
lib/crypto: x86/blake2s: Avoid writing back unchanged 'f' value
lib/crypto: x86/blake2s: Improve readability
lib/crypto: x86/blake2s: Use local labels for data
lib/crypto: x86/blake2s: Drop check for nblocks == 0
lib/crypto: x86/blake2s: Fix 32-bit arg treated as 64-bit
lib/crypto: arm, arm64: Drop filenames from file comments
lib/crypto: arm/blake2s: Fix some comments
crypto: s390/sha3 - Remove superseded SHA-3 code
crypto: sha3 - Reimplement using library API
crypto: jitterentropy - Use default sha3 implementation
lib/crypto: s390/sha3: Add optimized one-shot SHA-3 digest functions
lib/crypto: sha3: Support arch overrides of one-shot digest functions
...

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lib/crypto: sha3: Support arch overrides of one-shot digest functions

Add support for architecture-specific overrides of sha3_224(),
sha3_256(), sha3_384(), and sha3_512(). This will be used to imp

lib/crypto: sha3: Support arch overrides of one-shot digest functions

Add support for architecture-specific overrides of sha3_224(),
sha3_256(), sha3_384(), and sha3_512(). This will be used to implement
these functions more efficiently on s390 than is possible via the usual
init + update + final flow.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Harald Freudenberger <freude@linux.ibm.com>
Link: https://lore.kernel.org/r/20251026055032.1413733-12-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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lib/crypto: sha3: Add FIPS cryptographic algorithm self-test

Since the SHA-3 algorithms are FIPS-approved, add the boot-time
self-test which is apparently required. This closely follows the
corresp

lib/crypto: sha3: Add FIPS cryptographic algorithm self-test

Since the SHA-3 algorithms are FIPS-approved, add the boot-time
self-test which is apparently required. This closely follows the
corresponding SHA-1, SHA-256, and SHA-512 tests.

Tested-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20251026055032.1413733-8-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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lib/crypto: sha3: Move SHA3 Iota step mapping into round function

In crypto/sha3_generic.c, the keccakf() function calls keccakf_round()
to do four of Keccak-f's five step mappings. However, it doe

lib/crypto: sha3: Move SHA3 Iota step mapping into round function

In crypto/sha3_generic.c, the keccakf() function calls keccakf_round()
to do four of Keccak-f's five step mappings. However, it does not do
the Iota step mapping - presumably because that is dependent on round
number, whereas Theta, Rho, Pi and Chi are not.

Note that the keccakf_round() function needs to be explicitly
non-inlined on certain architectures as gcc's produced output will (or
used to) use over 1KiB of stack space if inlined.

Now, this code was copied more or less verbatim into lib/crypto/sha3.c,
so that has the same aesthetic issue. Fix this there by passing the
round number into sha3_keccakf_one_round_generic() and doing the Iota
step mapping there.

crypto/sha3_generic.c is left untouched as that will be converted to use
lib/crypto/sha3.c at some point.

Suggested-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20251026055032.1413733-5-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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lib/crypto: sha3: Add SHA-3 support

Add SHA-3 support to lib/crypto/. All six algorithms in the SHA-3
family are supported: four digests (SHA3-224, SHA3-256, SHA3-384, and
SHA3-512) and two extenda

lib/crypto: sha3: Add SHA-3 support

Add SHA-3 support to lib/crypto/. All six algorithms in the SHA-3
family are supported: four digests (SHA3-224, SHA3-256, SHA3-384, and
SHA3-512) and two extendable-output functions (SHAKE128 and SHAKE256).

The SHAKE algorithms will be required for ML-DSA.

[EB: simplified the API to use fewer types and functions, fixed bug that
sometimes caused incorrect SHAKE output, cleaned up the
documentation, dropped an ad-hoc test that was inconsistent with
the rest of lib/crypto/, and many other cleanups]

Signed-off-by: David Howells <dhowells@redhat.com>
Co-developed-by: Eric Biggers <ebiggers@kernel.org>
Tested-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20251026055032.1413733-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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