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crypto: gcm - Use GHASH library instead of crypto_ahash

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Make the "gcm" template access GHASH using the library API instead of
crypto_ahash.  This is much simpler and more efficient, especially given
that all GHASH implementations are synchronous and CPU-based anyway.

Note that this allows "ghash" to be removed from the crypto_ahash (and
crypto_shash) API, which a later commit will do.

This mirrors the similar cleanup that was done with POLYVAL.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260319061723.1140720-16-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2026-03-18 23:17:16 -07:00
parent 3e79c8ec49
commit 9f4e9553a1
4 changed files with 92 additions and 349 deletions
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2
crypto/Kconfig
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@@ -794,7 +794,7 @@ config CRYPTO_GCM
tristate "GCM (Galois/Counter Mode) and GMAC (GCM MAC)"
select CRYPTO_CTR
select CRYPTO_AEAD
select CRYPTO_GHASH
select CRYPTO_LIB_GF128HASH
select CRYPTO_MANAGER
help
GCM (Galois/Counter Mode) authenticated encryption mode and GMAC