diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/080-wireguard-0009-crypto-arm-chacha-expose-ARM-ChaCha-routine-as-libra.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/080-wireguard-0009-crypto-arm-chacha-expose-ARM-ChaCha-routine-as-libra.patch | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/080-wireguard-0009-crypto-arm-chacha-expose-ARM-ChaCha-routine-as-libra.patch b/target/linux/generic/backport-5.4/080-wireguard-0009-crypto-arm-chacha-expose-ARM-ChaCha-routine-as-libra.patch new file mode 100644 index 0000000000..4006dc63b2 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0009-crypto-arm-chacha-expose-ARM-ChaCha-routine-as-libra.patch @@ -0,0 +1,108 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Ard Biesheuvel <ardb@kernel.org> +Date: Fri, 8 Nov 2019 13:22:15 +0100 +Subject: [PATCH] crypto: arm/chacha - expose ARM ChaCha routine as library + function + +commit a44a3430d71bad4ee56788a59fff099b291ea54c upstream. + +Expose the accelerated NEON ChaCha routine directly as a symbol +export so that users of the ChaCha library API can use it directly. + +Given that calls into the library API will always go through the +routines in this module if it is enabled, switch to static keys +to select the optimal implementation available (which may be none +at all, in which case we defer to the generic implementation for +all invocations). + +Signed-off-by: Ard Biesheuvel <ardb@kernel.org> +Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + arch/arm/crypto/Kconfig | 1 + + arch/arm/crypto/chacha-glue.c | 41 ++++++++++++++++++++++++++++++++++- + 2 files changed, 41 insertions(+), 1 deletion(-) + +--- a/arch/arm/crypto/Kconfig ++++ b/arch/arm/crypto/Kconfig +@@ -129,6 +129,7 @@ config CRYPTO_CRC32_ARM_CE + config CRYPTO_CHACHA20_NEON + tristate "NEON and scalar accelerated ChaCha stream cipher algorithms" + select CRYPTO_BLKCIPHER ++ select CRYPTO_ARCH_HAVE_LIB_CHACHA + + config CRYPTO_NHPOLY1305_NEON + tristate "NEON accelerated NHPoly1305 hash function (for Adiantum)" +--- a/arch/arm/crypto/chacha-glue.c ++++ b/arch/arm/crypto/chacha-glue.c +@@ -11,6 +11,7 @@ + #include <crypto/internal/chacha.h> + #include <crypto/internal/simd.h> + #include <crypto/internal/skcipher.h> ++#include <linux/jump_label.h> + #include <linux/kernel.h> + #include <linux/module.h> + +@@ -29,9 +30,11 @@ asmlinkage void hchacha_block_neon(const + asmlinkage void chacha_doarm(u8 *dst, const u8 *src, unsigned int bytes, + const u32 *state, int nrounds); + ++static __ro_after_init DEFINE_STATIC_KEY_FALSE(use_neon); ++ + static inline bool neon_usable(void) + { +- return crypto_simd_usable(); ++ return static_branch_likely(&use_neon) && crypto_simd_usable(); + } + + static void chacha_doneon(u32 *state, u8 *dst, const u8 *src, +@@ -60,6 +63,40 @@ static void chacha_doneon(u32 *state, u8 + } + } + ++void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds) ++{ ++ if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon_usable()) { ++ hchacha_block_arm(state, stream, nrounds); ++ } else { ++ kernel_neon_begin(); ++ hchacha_block_neon(state, stream, nrounds); ++ kernel_neon_end(); ++ } ++} ++EXPORT_SYMBOL(hchacha_block_arch); ++ ++void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv) ++{ ++ chacha_init_generic(state, key, iv); ++} ++EXPORT_SYMBOL(chacha_init_arch); ++ ++void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, unsigned int bytes, ++ int nrounds) ++{ ++ if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon_usable() || ++ bytes <= CHACHA_BLOCK_SIZE) { ++ chacha_doarm(dst, src, bytes, state, nrounds); ++ state[12] += DIV_ROUND_UP(bytes, CHACHA_BLOCK_SIZE); ++ return; ++ } ++ ++ kernel_neon_begin(); ++ chacha_doneon(state, dst, src, bytes, nrounds); ++ kernel_neon_end(); ++} ++EXPORT_SYMBOL(chacha_crypt_arch); ++ + static int chacha_stream_xor(struct skcipher_request *req, + const struct chacha_ctx *ctx, const u8 *iv, + bool neon) +@@ -269,6 +306,8 @@ static int __init chacha_simd_mod_init(v + for (i = 0; i < ARRAY_SIZE(neon_algs); i++) + neon_algs[i].base.cra_priority = 0; + break; ++ default: ++ static_branch_enable(&use_neon); + } + + err = crypto_register_skciphers(neon_algs, ARRAY_SIZE(neon_algs)); |