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authorJason A. Donenfeld <Jason@zx2c4.com>2019-11-08 15:22:38 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2019-11-17 04:02:44 +0300
commitd8f1308a025fc7e00414194ed742d5f05a21e13c (patch)
tree0cb1ae963db9136c1757bc32e8903976842bccaa /arch/arm/crypto/Kconfig
parentf0fb006b604f98e2309a30f34ef455ac734f7c1c (diff)
downloadlinux-d8f1308a025fc7e00414194ed742d5f05a21e13c.tar.xz
crypto: arm/curve25519 - wire up NEON implementation
This ports the SUPERCOP implementation for usage in kernel space. In addition to the usual header, macro, and style changes required for kernel space, it makes a few small changes to the code: - The stack alignment is relaxed to 16 bytes. - Superfluous mov statements have been removed. - ldr for constants has been replaced with movw. - ldreq has been replaced with moveq. - The str epilogue has been made more idiomatic. - SIMD registers are not pushed and popped at the beginning and end. - The prologue and epilogue have been made idiomatic. - A hole has been removed from the stack, saving 32 bytes. - We write-back the base register whenever possible for vld1.8. - Some multiplications have been reordered for better A7 performance. There are more opportunities for cleanup, since this code is from qhasm, which doesn't always do the most opportune thing. But even prior to extensive hand optimizations, this code delivers significant performance improvements (given in get_cycles() per call): ----------- ------------- | generic C | this commit | ------------ ----------- ------------- | Cortex-A7 | 49136 | 22395 | ------------ ----------- ------------- | Cortex-A17 | 17326 | 4983 | ------------ ----------- ------------- Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> [ardb: - move to arch/arm/crypto - wire into lib/crypto framework - implement crypto API KPP hooks ] Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/arm/crypto/Kconfig')
-rw-r--r--arch/arm/crypto/Kconfig6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig
index 166d32616fea..ab676229b0da 100644
--- a/arch/arm/crypto/Kconfig
+++ b/arch/arm/crypto/Kconfig
@@ -142,4 +142,10 @@ config CRYPTO_NHPOLY1305_NEON
depends on KERNEL_MODE_NEON
select CRYPTO_NHPOLY1305
+config CRYPTO_CURVE25519_NEON
+ tristate "NEON accelerated Curve25519 scalar multiplication library"
+ depends on KERNEL_MODE_NEON
+ select CRYPTO_LIB_CURVE25519_GENERIC
+ select CRYPTO_ARCH_HAVE_LIB_CURVE25519
+
endif