diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2024-01-18 18:06:34 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2024-01-26 16:39:32 +0800 |
| commit | 948ffc66e595e56c6ebf672db38d59c8a9efc108 (patch) | |
| tree | eb93f400d69d6e38442865625644ef1e8ac63be3 /arch/arm64/crypto/Kconfig | |
| parent | c131098d6d9c5d0a580456f527dedefaf61acb7b (diff) | |
crypto: arm64/aes-ccm - Reuse existing MAC update for AAD input
CCM combines the counter (CTR) encryption mode with a MAC based on the
same block cipher. This MAC construction is a bit clunky: it invokes the
block cipher in a way that cannot be parallelized, resulting in poor CPU
pipeline efficiency.
The arm64 CCM code mitigates this by interleaving the encryption and MAC
at the AES round level, resulting in a substantial speedup. But this
approach does not apply to the additional authenticated data (AAD) which
is not encrypted.
This means the special asm routine dealing with the AAD is not any
better than the MAC update routine used by the arm64 AES block
encryption driver, so let's reuse that, and drop the special AES-CCM
version.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/arm64/crypto/Kconfig')
| -rw-r--r-- | arch/arm64/crypto/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig index eb7b423ba463..e7d9bd8e4709 100644 --- a/arch/arm64/crypto/Kconfig +++ b/arch/arm64/crypto/Kconfig @@ -268,6 +268,7 @@ config CRYPTO_AES_ARM64_CE_CCM depends on ARM64 && KERNEL_MODE_NEON select CRYPTO_ALGAPI select CRYPTO_AES_ARM64_CE + select CRYPTO_AES_ARM64_CE_BLK select CRYPTO_AEAD select CRYPTO_LIB_AES help |