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lib/crypto: s390/aes: Migrate optimized code into library

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Implement aes_preparekey_arch(), aes_encrypt_arch(), and
aes_decrypt_arch() using the CPACF AES instructions.

Then, remove the superseded "aes-s390" crypto_cipher.

The result is that both the AES library and crypto_cipher APIs use the
CPACF AES instructions, whereas previously only crypto_cipher did (and
it wasn't enabled by default, which this commit fixes as well).

Note that this preserves the optimization where the AES key is stored in
raw form rather than expanded form.  CPACF just takes the raw key.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Holger Dengler <dengler@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Link: https://lore.kernel.org/r/20260112192035.10427-16-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2026-01-12 11:20:13 -08:00
parent a4e573db06
commit 0cab15611e
5 changed files with 110 additions and 115 deletions
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lib/crypto/Kconfig
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@@ -19,6 +19,7 @@ config CRYPTO_LIB_AES_ARCH
default y if PPC && (SPE || (PPC64 && VSX))
default y if RISCV && 64BIT && TOOLCHAIN_HAS_VECTOR_CRYPTO && \
RISCV_EFFICIENT_VECTOR_UNALIGNED_ACCESS
default y if S390
config CRYPTO_LIB_AESCFB
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