mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 06:08:08 +00:00
20ea6adbf1
Build system: x86_64 Build-tested: bcm2708, bcm2709, bcm2710, bcm2711 Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B Signed-off-by: Marty Jones <mj8263788@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
106 lines
4.3 KiB
Diff
106 lines
4.3 KiB
Diff
From d4a2fa7b58d3891544c9b7e41e92f17774ad7d1f Mon Sep 17 00:00:00 2001
|
|
From: Ben Avison <bavison@riscosopen.org>
|
|
Date: Mon, 8 Mar 2021 15:32:25 +0000
|
|
Subject: [PATCH] Assign crypto aliases to different AES implementation
|
|
modules
|
|
|
|
The kernel modules aes-neon-blk and aes-neon-bs perform poorly, at least on
|
|
Cortex-A72 without crypto extensions. In fact, aes-arm64 outperforms them
|
|
on benchmarks, despite it being a simpler implementation (only accelerating
|
|
the single-block AES cipher).
|
|
|
|
For modes of operation where multiple cipher blocks can be processed in
|
|
parallel, aes-neon-bs outperforms aes-neon-blk by around 60-70% and aes-arm64
|
|
is another 10-20% faster still. But the difference is even more marked with
|
|
modes of operation with dependencies between neighbouring blocks, such as
|
|
CBC encryption, which defeat parallelism: in these cases, aes-arm64 is
|
|
typically around 250% faster than either aes-neon-blk or aes-neon-bs.
|
|
|
|
The key trade-off with aes-arm64 is that the look-up tables are situated in
|
|
RAM. This leaves them potentially open to cache timing attacks. The two other
|
|
modules, by contrast, load the look-up tables into NEON registers and so are
|
|
able to perform in constant time.
|
|
|
|
This patch aims to load aes-arm64 more often.
|
|
|
|
If none of the currently-loaded crypto modules implement a given algorithm,
|
|
a new one is typically selected for loading using a platform-neutral alias
|
|
describing the required algorithm. To enable users to still
|
|
load aes-neon-blk or aes-neon-bs if they really want them, while still
|
|
ensuring that aes-arm64 is usually selected, remove the aliases from
|
|
aes-neonbs-glue.c and aes-glue.c and apply them to aes-cipher-glue.c, but
|
|
still build the two NEON modules.
|
|
|
|
Since aes-glue.c can also be used to build aes-ce-blk, leave them enabled
|
|
if USE_V8_CRYPTO_EXTENSIONS is defined, to ensure they are selected if we
|
|
in future use a CPU which has the crypto extensions enabled.
|
|
|
|
Note that the algorithm priority specifiers are unchanged, so if
|
|
aes-neon-bs is loaded at the same time as aes-arm64, the former will be
|
|
used in preference. However, aes-neon-blk and aes-arm64 have tied priority,
|
|
so whichever module was loaded first will be used (assuming aes-neon-bs is
|
|
not loaded).
|
|
|
|
Signed-off-by: Ben Avison <bavison@riscosopen.org>
|
|
---
|
|
arch/arm64/crypto/aes-cipher-glue.c | 10 ++++++++++
|
|
arch/arm64/crypto/aes-glue.c | 4 ++--
|
|
arch/arm64/crypto/aes-neonbs-glue.c | 5 -----
|
|
3 files changed, 12 insertions(+), 7 deletions(-)
|
|
|
|
--- a/arch/arm64/crypto/aes-cipher-glue.c
|
|
+++ b/arch/arm64/crypto/aes-cipher-glue.c
|
|
@@ -9,6 +9,16 @@
|
|
#include <linux/crypto.h>
|
|
#include <linux/module.h>
|
|
|
|
+MODULE_ALIAS_CRYPTO("ecb(aes)");
|
|
+MODULE_ALIAS_CRYPTO("cbc(aes)");
|
|
+MODULE_ALIAS_CRYPTO("ctr(aes)");
|
|
+MODULE_ALIAS_CRYPTO("xts(aes)");
|
|
+MODULE_ALIAS_CRYPTO("cts(cbc(aes))");
|
|
+MODULE_ALIAS_CRYPTO("essiv(cbc(aes),sha256)");
|
|
+MODULE_ALIAS_CRYPTO("cmac(aes)");
|
|
+MODULE_ALIAS_CRYPTO("xcbc(aes)");
|
|
+MODULE_ALIAS_CRYPTO("cbcmac(aes)");
|
|
+
|
|
asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
|
|
asmlinkage void __aes_arm64_decrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
|
|
|
|
--- a/arch/arm64/crypto/aes-glue.c
|
|
+++ b/arch/arm64/crypto/aes-glue.c
|
|
@@ -57,17 +57,17 @@ MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS
|
|
#define aes_mac_update neon_aes_mac_update
|
|
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON");
|
|
#endif
|
|
-#if defined(USE_V8_CRYPTO_EXTENSIONS) || !IS_ENABLED(CONFIG_CRYPTO_AES_ARM64_BS)
|
|
+#if defined(USE_V8_CRYPTO_EXTENSIONS)
|
|
MODULE_ALIAS_CRYPTO("ecb(aes)");
|
|
MODULE_ALIAS_CRYPTO("cbc(aes)");
|
|
MODULE_ALIAS_CRYPTO("ctr(aes)");
|
|
MODULE_ALIAS_CRYPTO("xts(aes)");
|
|
-#endif
|
|
MODULE_ALIAS_CRYPTO("cts(cbc(aes))");
|
|
MODULE_ALIAS_CRYPTO("essiv(cbc(aes),sha256)");
|
|
MODULE_ALIAS_CRYPTO("cmac(aes)");
|
|
MODULE_ALIAS_CRYPTO("xcbc(aes)");
|
|
MODULE_ALIAS_CRYPTO("cbcmac(aes)");
|
|
+#endif
|
|
|
|
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
--- a/arch/arm64/crypto/aes-neonbs-glue.c
|
|
+++ b/arch/arm64/crypto/aes-neonbs-glue.c
|
|
@@ -18,11 +18,6 @@
|
|
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
-MODULE_ALIAS_CRYPTO("ecb(aes)");
|
|
-MODULE_ALIAS_CRYPTO("cbc(aes)");
|
|
-MODULE_ALIAS_CRYPTO("ctr(aes)");
|
|
-MODULE_ALIAS_CRYPTO("xts(aes)");
|
|
-
|
|
asmlinkage void aesbs_convert_key(u8 out[], u32 const rk[], int rounds);
|
|
|
|
asmlinkage void aesbs_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
|