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crypto: hctr2 - Convert to use POLYVAL library

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The "hash function" in hctr2 is fixed at POLYVAL; it can never vary.
Just use the POLYVAL library, which is much easier to use than the
crypto_shash API.  It's faster, uses fixed-size structs, and never fails
(all the functions return void).

Note that this eliminates the only known user of the polyval support in
crypto_shash.  A later commit will remove support for polyval from
crypto_shash, given that the library API is sufficient.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20251109234726.638437-7-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2025-11-09 15:47:21 -08:00
parent 4d8da35579
commit d35abc0b1d
3 changed files with 64 additions and 163 deletions
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2
crypto/Kconfig
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@@ -696,7 +696,7 @@ config CRYPTO_ECB
config CRYPTO_HCTR2
tristate "HCTR2"
select CRYPTO_XCTR
select CRYPTO_POLYVAL
select CRYPTO_LIB_POLYVAL
select CRYPTO_MANAGER
help
HCTR2 length-preserving encryption mode