crypto: arm64/chacha - depend on generic chacha library instead of crypto driver
Depend on the generic ChaCha library routines instead of pulling in the
generic ChaCha skcipher driver, which is more than we need, and makes
managing the dependencies between the generic library, generic driver,
accelerated library and driver more complicated.
While at it, drop the logic to prefer the scalar code on short inputs.
Turning the NEON on and off is cheap these days, and one major use case
for ChaCha20 is ChaCha20-Poly1305, which is guaranteed to hit the scalar
path upon every invocation (when doing the Poly1305 nonce generation)
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
index 286e351..22c6642 100644
--- a/arch/arm64/crypto/Kconfig
+++ b/arch/arm64/crypto/Kconfig
@@ -103,7 +103,7 @@
tristate "ChaCha20, XChaCha20, and XChaCha12 stream ciphers using NEON instructions"
depends on KERNEL_MODE_NEON
select CRYPTO_SKCIPHER
- select CRYPTO_CHACHA20
+ select CRYPTO_LIB_CHACHA_GENERIC
config CRYPTO_NHPOLY1305_NEON
tristate "NHPoly1305 hash function using NEON instructions (for Adiantum)"