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Diffstat (limited to 'target/linux/generic/backport-5.4/080-wireguard-0008-crypto-arm-chacha-remove-dependency-on-generic-ChaCh.patch')
-rw-r--r--target/linux/generic/backport-5.4/080-wireguard-0008-crypto-arm-chacha-remove-dependency-on-generic-ChaCh.patch691
1 files changed, 691 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/080-wireguard-0008-crypto-arm-chacha-remove-dependency-on-generic-ChaCh.patch b/target/linux/generic/backport-5.4/080-wireguard-0008-crypto-arm-chacha-remove-dependency-on-generic-ChaCh.patch
new file mode 100644
index 0000000000..7f907f2364
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0008-crypto-arm-chacha-remove-dependency-on-generic-ChaCh.patch
@@ -0,0 +1,691 @@
+From a92bd97c758d32511f0deeef84f25c3a1d5e7879 Mon Sep 17 00:00:00 2001
+From: Ard Biesheuvel <ardb@kernel.org>
+Date: Fri, 8 Nov 2019 13:22:14 +0100
+Subject: [PATCH 008/124] crypto: arm/chacha - remove dependency on generic
+ ChaCha driver
+
+commit b36d8c09e710c71f6a9690b6586fea2d1c9e1e27 upstream.
+
+Instead of falling back to the generic ChaCha skcipher driver for
+non-SIMD cases, use a fast scalar implementation for ARM authored
+by Eric Biggers. This removes the module dependency on chacha-generic
+altogether, which also simplifies things when we expose the ChaCha
+library interface from this module.
+
+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 | 4 +-
+ arch/arm/crypto/Makefile | 3 +-
+ arch/arm/crypto/chacha-glue.c | 304 +++++++++++++++++++++++++++
+ arch/arm/crypto/chacha-neon-glue.c | 202 ------------------
+ arch/arm/crypto/chacha-scalar-core.S | 65 +++---
+ arch/arm64/crypto/chacha-neon-glue.c | 2 +-
+ 6 files changed, 340 insertions(+), 240 deletions(-)
+ create mode 100644 arch/arm/crypto/chacha-glue.c
+ delete mode 100644 arch/arm/crypto/chacha-neon-glue.c
+
+--- a/arch/arm/crypto/Kconfig
++++ b/arch/arm/crypto/Kconfig
+@@ -127,10 +127,8 @@ config CRYPTO_CRC32_ARM_CE
+ select CRYPTO_HASH
+
+ config CRYPTO_CHACHA20_NEON
+- tristate "NEON accelerated ChaCha stream cipher algorithms"
+- depends on KERNEL_MODE_NEON
++ tristate "NEON and scalar accelerated ChaCha stream cipher algorithms"
+ select CRYPTO_BLKCIPHER
+- select CRYPTO_CHACHA20
+
+ config CRYPTO_NHPOLY1305_NEON
+ tristate "NEON accelerated NHPoly1305 hash function (for Adiantum)"
+--- a/arch/arm/crypto/Makefile
++++ b/arch/arm/crypto/Makefile
+@@ -53,7 +53,8 @@ aes-arm-ce-y := aes-ce-core.o aes-ce-glu
+ ghash-arm-ce-y := ghash-ce-core.o ghash-ce-glue.o
+ crct10dif-arm-ce-y := crct10dif-ce-core.o crct10dif-ce-glue.o
+ crc32-arm-ce-y:= crc32-ce-core.o crc32-ce-glue.o
+-chacha-neon-y := chacha-neon-core.o chacha-neon-glue.o
++chacha-neon-y := chacha-scalar-core.o chacha-glue.o
++chacha-neon-$(CONFIG_KERNEL_MODE_NEON) += chacha-neon-core.o
+ nhpoly1305-neon-y := nh-neon-core.o nhpoly1305-neon-glue.o
+
+ ifdef REGENERATE_ARM_CRYPTO
+--- /dev/null
++++ b/arch/arm/crypto/chacha-glue.c
+@@ -0,0 +1,304 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * ARM NEON accelerated ChaCha and XChaCha stream ciphers,
++ * including ChaCha20 (RFC7539)
++ *
++ * Copyright (C) 2016-2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
++ * Copyright (C) 2015 Martin Willi
++ */
++
++#include <crypto/algapi.h>
++#include <crypto/internal/chacha.h>
++#include <crypto/internal/simd.h>
++#include <crypto/internal/skcipher.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++
++#include <asm/cputype.h>
++#include <asm/hwcap.h>
++#include <asm/neon.h>
++#include <asm/simd.h>
++
++asmlinkage void chacha_block_xor_neon(const u32 *state, u8 *dst, const u8 *src,
++ int nrounds);
++asmlinkage void chacha_4block_xor_neon(const u32 *state, u8 *dst, const u8 *src,
++ int nrounds);
++asmlinkage void hchacha_block_arm(const u32 *state, u32 *out, int nrounds);
++asmlinkage void hchacha_block_neon(const u32 *state, u32 *out, int nrounds);
++
++asmlinkage void chacha_doarm(u8 *dst, const u8 *src, unsigned int bytes,
++ const u32 *state, int nrounds);
++
++static inline bool neon_usable(void)
++{
++ return crypto_simd_usable();
++}
++
++static void chacha_doneon(u32 *state, u8 *dst, const u8 *src,
++ unsigned int bytes, int nrounds)
++{
++ u8 buf[CHACHA_BLOCK_SIZE];
++
++ while (bytes >= CHACHA_BLOCK_SIZE * 4) {
++ chacha_4block_xor_neon(state, dst, src, nrounds);
++ bytes -= CHACHA_BLOCK_SIZE * 4;
++ src += CHACHA_BLOCK_SIZE * 4;
++ dst += CHACHA_BLOCK_SIZE * 4;
++ state[12] += 4;
++ }
++ while (bytes >= CHACHA_BLOCK_SIZE) {
++ chacha_block_xor_neon(state, dst, src, nrounds);
++ bytes -= CHACHA_BLOCK_SIZE;
++ src += CHACHA_BLOCK_SIZE;
++ dst += CHACHA_BLOCK_SIZE;
++ state[12]++;
++ }
++ if (bytes) {
++ memcpy(buf, src, bytes);
++ chacha_block_xor_neon(state, buf, buf, nrounds);
++ memcpy(dst, buf, bytes);
++ }
++}
++
++static int chacha_stream_xor(struct skcipher_request *req,
++ const struct chacha_ctx *ctx, const u8 *iv,
++ bool neon)
++{
++ struct skcipher_walk walk;
++ u32 state[16];
++ int err;
++
++ err = skcipher_walk_virt(&walk, req, false);
++
++ chacha_init_generic(state, ctx->key, iv);
++
++ while (walk.nbytes > 0) {
++ unsigned int nbytes = walk.nbytes;
++
++ if (nbytes < walk.total)
++ nbytes = round_down(nbytes, walk.stride);
++
++ if (!neon) {
++ chacha_doarm(walk.dst.virt.addr, walk.src.virt.addr,
++ nbytes, state, ctx->nrounds);
++ state[12] += DIV_ROUND_UP(nbytes, CHACHA_BLOCK_SIZE);
++ } else {
++ kernel_neon_begin();
++ chacha_doneon(state, walk.dst.virt.addr,
++ walk.src.virt.addr, nbytes, ctx->nrounds);
++ kernel_neon_end();
++ }
++ err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
++ }
++
++ return err;
++}
++
++static int do_chacha(struct skcipher_request *req, bool neon)
++{
++ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
++ struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
++
++ return chacha_stream_xor(req, ctx, req->iv, neon);
++}
++
++static int chacha_arm(struct skcipher_request *req)
++{
++ return do_chacha(req, false);
++}
++
++static int chacha_neon(struct skcipher_request *req)
++{
++ return do_chacha(req, neon_usable());
++}
++
++static int do_xchacha(struct skcipher_request *req, bool neon)
++{
++ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
++ struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
++ struct chacha_ctx subctx;
++ u32 state[16];
++ u8 real_iv[16];
++
++ chacha_init_generic(state, ctx->key, req->iv);
++
++ if (!neon) {
++ hchacha_block_arm(state, subctx.key, ctx->nrounds);
++ } else {
++ kernel_neon_begin();
++ hchacha_block_neon(state, subctx.key, ctx->nrounds);
++ kernel_neon_end();
++ }
++ subctx.nrounds = ctx->nrounds;
++
++ memcpy(&real_iv[0], req->iv + 24, 8);
++ memcpy(&real_iv[8], req->iv + 16, 8);
++ return chacha_stream_xor(req, &subctx, real_iv, neon);
++}
++
++static int xchacha_arm(struct skcipher_request *req)
++{
++ return do_xchacha(req, false);
++}
++
++static int xchacha_neon(struct skcipher_request *req)
++{
++ return do_xchacha(req, neon_usable());
++}
++
++static struct skcipher_alg arm_algs[] = {
++ {
++ .base.cra_name = "chacha20",
++ .base.cra_driver_name = "chacha20-arm",
++ .base.cra_priority = 200,
++ .base.cra_blocksize = 1,
++ .base.cra_ctxsize = sizeof(struct chacha_ctx),
++ .base.cra_module = THIS_MODULE,
++
++ .min_keysize = CHACHA_KEY_SIZE,
++ .max_keysize = CHACHA_KEY_SIZE,
++ .ivsize = CHACHA_IV_SIZE,
++ .chunksize = CHACHA_BLOCK_SIZE,
++ .setkey = chacha20_setkey,
++ .encrypt = chacha_arm,
++ .decrypt = chacha_arm,
++ }, {
++ .base.cra_name = "xchacha20",
++ .base.cra_driver_name = "xchacha20-arm",
++ .base.cra_priority = 200,
++ .base.cra_blocksize = 1,
++ .base.cra_ctxsize = sizeof(struct chacha_ctx),
++ .base.cra_module = THIS_MODULE,
++
++ .min_keysize = CHACHA_KEY_SIZE,
++ .max_keysize = CHACHA_KEY_SIZE,
++ .ivsize = XCHACHA_IV_SIZE,
++ .chunksize = CHACHA_BLOCK_SIZE,
++ .setkey = chacha20_setkey,
++ .encrypt = xchacha_arm,
++ .decrypt = xchacha_arm,
++ }, {
++ .base.cra_name = "xchacha12",
++ .base.cra_driver_name = "xchacha12-arm",
++ .base.cra_priority = 200,
++ .base.cra_blocksize = 1,
++ .base.cra_ctxsize = sizeof(struct chacha_ctx),
++ .base.cra_module = THIS_MODULE,
++
++ .min_keysize = CHACHA_KEY_SIZE,
++ .max_keysize = CHACHA_KEY_SIZE,
++ .ivsize = XCHACHA_IV_SIZE,
++ .chunksize = CHACHA_BLOCK_SIZE,
++ .setkey = chacha12_setkey,
++ .encrypt = xchacha_arm,
++ .decrypt = xchacha_arm,
++ },
++};
++
++static struct skcipher_alg neon_algs[] = {
++ {
++ .base.cra_name = "chacha20",
++ .base.cra_driver_name = "chacha20-neon",
++ .base.cra_priority = 300,
++ .base.cra_blocksize = 1,
++ .base.cra_ctxsize = sizeof(struct chacha_ctx),
++ .base.cra_module = THIS_MODULE,
++
++ .min_keysize = CHACHA_KEY_SIZE,
++ .max_keysize = CHACHA_KEY_SIZE,
++ .ivsize = CHACHA_IV_SIZE,
++ .chunksize = CHACHA_BLOCK_SIZE,
++ .walksize = 4 * CHACHA_BLOCK_SIZE,
++ .setkey = chacha20_setkey,
++ .encrypt = chacha_neon,
++ .decrypt = chacha_neon,
++ }, {
++ .base.cra_name = "xchacha20",
++ .base.cra_driver_name = "xchacha20-neon",
++ .base.cra_priority = 300,
++ .base.cra_blocksize = 1,
++ .base.cra_ctxsize = sizeof(struct chacha_ctx),
++ .base.cra_module = THIS_MODULE,
++
++ .min_keysize = CHACHA_KEY_SIZE,
++ .max_keysize = CHACHA_KEY_SIZE,
++ .ivsize = XCHACHA_IV_SIZE,
++ .chunksize = CHACHA_BLOCK_SIZE,
++ .walksize = 4 * CHACHA_BLOCK_SIZE,
++ .setkey = chacha20_setkey,
++ .encrypt = xchacha_neon,
++ .decrypt = xchacha_neon,
++ }, {
++ .base.cra_name = "xchacha12",
++ .base.cra_driver_name = "xchacha12-neon",
++ .base.cra_priority = 300,
++ .base.cra_blocksize = 1,
++ .base.cra_ctxsize = sizeof(struct chacha_ctx),
++ .base.cra_module = THIS_MODULE,
++
++ .min_keysize = CHACHA_KEY_SIZE,
++ .max_keysize = CHACHA_KEY_SIZE,
++ .ivsize = XCHACHA_IV_SIZE,
++ .chunksize = CHACHA_BLOCK_SIZE,
++ .walksize = 4 * CHACHA_BLOCK_SIZE,
++ .setkey = chacha12_setkey,
++ .encrypt = xchacha_neon,
++ .decrypt = xchacha_neon,
++ }
++};
++
++static int __init chacha_simd_mod_init(void)
++{
++ int err;
++
++ err = crypto_register_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
++ if (err)
++ return err;
++
++ if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_NEON)) {
++ int i;
++
++ switch (read_cpuid_part()) {
++ case ARM_CPU_PART_CORTEX_A7:
++ case ARM_CPU_PART_CORTEX_A5:
++ /*
++ * The Cortex-A7 and Cortex-A5 do not perform well with
++ * the NEON implementation but do incredibly with the
++ * scalar one and use less power.
++ */
++ for (i = 0; i < ARRAY_SIZE(neon_algs); i++)
++ neon_algs[i].base.cra_priority = 0;
++ break;
++ }
++
++ err = crypto_register_skciphers(neon_algs, ARRAY_SIZE(neon_algs));
++ if (err)
++ crypto_unregister_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
++ }
++ return err;
++}
++
++static void __exit chacha_simd_mod_fini(void)
++{
++ crypto_unregister_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
++ if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_NEON))
++ crypto_unregister_skciphers(neon_algs, ARRAY_SIZE(neon_algs));
++}
++
++module_init(chacha_simd_mod_init);
++module_exit(chacha_simd_mod_fini);
++
++MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (scalar and NEON accelerated)");
++MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS_CRYPTO("chacha20");
++MODULE_ALIAS_CRYPTO("chacha20-arm");
++MODULE_ALIAS_CRYPTO("xchacha20");
++MODULE_ALIAS_CRYPTO("xchacha20-arm");
++MODULE_ALIAS_CRYPTO("xchacha12");
++MODULE_ALIAS_CRYPTO("xchacha12-arm");
++#ifdef CONFIG_KERNEL_MODE_NEON
++MODULE_ALIAS_CRYPTO("chacha20-neon");
++MODULE_ALIAS_CRYPTO("xchacha20-neon");
++MODULE_ALIAS_CRYPTO("xchacha12-neon");
++#endif
+--- a/arch/arm/crypto/chacha-neon-glue.c
++++ /dev/null
+@@ -1,202 +0,0 @@
+-/*
+- * ARM NEON accelerated ChaCha and XChaCha stream ciphers,
+- * including ChaCha20 (RFC7539)
+- *
+- * Copyright (C) 2016 Linaro, Ltd. <ard.biesheuvel@linaro.org>
+- *
+- * This program is free software; you can redistribute it and/or modify
+- * it under the terms of the GNU General Public License version 2 as
+- * published by the Free Software Foundation.
+- *
+- * Based on:
+- * ChaCha20 256-bit cipher algorithm, RFC7539, SIMD glue code
+- *
+- * Copyright (C) 2015 Martin Willi
+- *
+- * This program is free software; you can redistribute it and/or modify
+- * it under the terms of the GNU General Public License as published by
+- * the Free Software Foundation; either version 2 of the License, or
+- * (at your option) any later version.
+- */
+-
+-#include <crypto/algapi.h>
+-#include <crypto/internal/chacha.h>
+-#include <crypto/internal/simd.h>
+-#include <crypto/internal/skcipher.h>
+-#include <linux/kernel.h>
+-#include <linux/module.h>
+-
+-#include <asm/hwcap.h>
+-#include <asm/neon.h>
+-#include <asm/simd.h>
+-
+-asmlinkage void chacha_block_xor_neon(const u32 *state, u8 *dst, const u8 *src,
+- int nrounds);
+-asmlinkage void chacha_4block_xor_neon(const u32 *state, u8 *dst, const u8 *src,
+- int nrounds);
+-asmlinkage void hchacha_block_neon(const u32 *state, u32 *out, int nrounds);
+-
+-static void chacha_doneon(u32 *state, u8 *dst, const u8 *src,
+- unsigned int bytes, int nrounds)
+-{
+- u8 buf[CHACHA_BLOCK_SIZE];
+-
+- while (bytes >= CHACHA_BLOCK_SIZE * 4) {
+- chacha_4block_xor_neon(state, dst, src, nrounds);
+- bytes -= CHACHA_BLOCK_SIZE * 4;
+- src += CHACHA_BLOCK_SIZE * 4;
+- dst += CHACHA_BLOCK_SIZE * 4;
+- state[12] += 4;
+- }
+- while (bytes >= CHACHA_BLOCK_SIZE) {
+- chacha_block_xor_neon(state, dst, src, nrounds);
+- bytes -= CHACHA_BLOCK_SIZE;
+- src += CHACHA_BLOCK_SIZE;
+- dst += CHACHA_BLOCK_SIZE;
+- state[12]++;
+- }
+- if (bytes) {
+- memcpy(buf, src, bytes);
+- chacha_block_xor_neon(state, buf, buf, nrounds);
+- memcpy(dst, buf, bytes);
+- }
+-}
+-
+-static int chacha_neon_stream_xor(struct skcipher_request *req,
+- const struct chacha_ctx *ctx, const u8 *iv)
+-{
+- struct skcipher_walk walk;
+- u32 state[16];
+- int err;
+-
+- err = skcipher_walk_virt(&walk, req, false);
+-
+- crypto_chacha_init(state, ctx, iv);
+-
+- while (walk.nbytes > 0) {
+- unsigned int nbytes = walk.nbytes;
+-
+- if (nbytes < walk.total)
+- nbytes = round_down(nbytes, walk.stride);
+-
+- kernel_neon_begin();
+- chacha_doneon(state, walk.dst.virt.addr, walk.src.virt.addr,
+- nbytes, ctx->nrounds);
+- kernel_neon_end();
+- err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
+- }
+-
+- return err;
+-}
+-
+-static int chacha_neon(struct skcipher_request *req)
+-{
+- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+- struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
+-
+- if (req->cryptlen <= CHACHA_BLOCK_SIZE || !crypto_simd_usable())
+- return crypto_chacha_crypt(req);
+-
+- return chacha_neon_stream_xor(req, ctx, req->iv);
+-}
+-
+-static int xchacha_neon(struct skcipher_request *req)
+-{
+- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+- struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
+- struct chacha_ctx subctx;
+- u32 state[16];
+- u8 real_iv[16];
+-
+- if (req->cryptlen <= CHACHA_BLOCK_SIZE || !crypto_simd_usable())
+- return crypto_xchacha_crypt(req);
+-
+- crypto_chacha_init(state, ctx, req->iv);
+-
+- kernel_neon_begin();
+- hchacha_block_neon(state, subctx.key, ctx->nrounds);
+- kernel_neon_end();
+- subctx.nrounds = ctx->nrounds;
+-
+- memcpy(&real_iv[0], req->iv + 24, 8);
+- memcpy(&real_iv[8], req->iv + 16, 8);
+- return chacha_neon_stream_xor(req, &subctx, real_iv);
+-}
+-
+-static struct skcipher_alg algs[] = {
+- {
+- .base.cra_name = "chacha20",
+- .base.cra_driver_name = "chacha20-neon",
+- .base.cra_priority = 300,
+- .base.cra_blocksize = 1,
+- .base.cra_ctxsize = sizeof(struct chacha_ctx),
+- .base.cra_module = THIS_MODULE,
+-
+- .min_keysize = CHACHA_KEY_SIZE,
+- .max_keysize = CHACHA_KEY_SIZE,
+- .ivsize = CHACHA_IV_SIZE,
+- .chunksize = CHACHA_BLOCK_SIZE,
+- .walksize = 4 * CHACHA_BLOCK_SIZE,
+- .setkey = crypto_chacha20_setkey,
+- .encrypt = chacha_neon,
+- .decrypt = chacha_neon,
+- }, {
+- .base.cra_name = "xchacha20",
+- .base.cra_driver_name = "xchacha20-neon",
+- .base.cra_priority = 300,
+- .base.cra_blocksize = 1,
+- .base.cra_ctxsize = sizeof(struct chacha_ctx),
+- .base.cra_module = THIS_MODULE,
+-
+- .min_keysize = CHACHA_KEY_SIZE,
+- .max_keysize = CHACHA_KEY_SIZE,
+- .ivsize = XCHACHA_IV_SIZE,
+- .chunksize = CHACHA_BLOCK_SIZE,
+- .walksize = 4 * CHACHA_BLOCK_SIZE,
+- .setkey = crypto_chacha20_setkey,
+- .encrypt = xchacha_neon,
+- .decrypt = xchacha_neon,
+- }, {
+- .base.cra_name = "xchacha12",
+- .base.cra_driver_name = "xchacha12-neon",
+- .base.cra_priority = 300,
+- .base.cra_blocksize = 1,
+- .base.cra_ctxsize = sizeof(struct chacha_ctx),
+- .base.cra_module = THIS_MODULE,
+-
+- .min_keysize = CHACHA_KEY_SIZE,
+- .max_keysize = CHACHA_KEY_SIZE,
+- .ivsize = XCHACHA_IV_SIZE,
+- .chunksize = CHACHA_BLOCK_SIZE,
+- .walksize = 4 * CHACHA_BLOCK_SIZE,
+- .setkey = crypto_chacha12_setkey,
+- .encrypt = xchacha_neon,
+- .decrypt = xchacha_neon,
+- }
+-};
+-
+-static int __init chacha_simd_mod_init(void)
+-{
+- if (!(elf_hwcap & HWCAP_NEON))
+- return -ENODEV;
+-
+- return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
+-}
+-
+-static void __exit chacha_simd_mod_fini(void)
+-{
+- crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
+-}
+-
+-module_init(chacha_simd_mod_init);
+-module_exit(chacha_simd_mod_fini);
+-
+-MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (NEON accelerated)");
+-MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
+-MODULE_LICENSE("GPL v2");
+-MODULE_ALIAS_CRYPTO("chacha20");
+-MODULE_ALIAS_CRYPTO("chacha20-neon");
+-MODULE_ALIAS_CRYPTO("xchacha20");
+-MODULE_ALIAS_CRYPTO("xchacha20-neon");
+-MODULE_ALIAS_CRYPTO("xchacha12");
+-MODULE_ALIAS_CRYPTO("xchacha12-neon");
+--- a/arch/arm/crypto/chacha-scalar-core.S
++++ b/arch/arm/crypto/chacha-scalar-core.S
+@@ -41,14 +41,6 @@
+ X14 .req r12
+ X15 .req r14
+
+-.Lexpand_32byte_k:
+- // "expand 32-byte k"
+- .word 0x61707865, 0x3320646e, 0x79622d32, 0x6b206574
+-
+-#ifdef __thumb2__
+-# define adrl adr
+-#endif
+-
+ .macro __rev out, in, t0, t1, t2
+ .if __LINUX_ARM_ARCH__ >= 6
+ rev \out, \in
+@@ -391,61 +383,65 @@
+ .endm // _chacha
+
+ /*
+- * void chacha20_arm(u8 *out, const u8 *in, size_t len, const u32 key[8],
+- * const u32 iv[4]);
++ * void chacha_doarm(u8 *dst, const u8 *src, unsigned int bytes,
++ * const u32 *state, int nrounds);
+ */
+-ENTRY(chacha20_arm)
++ENTRY(chacha_doarm)
+ cmp r2, #0 // len == 0?
+ reteq lr
+
++ ldr ip, [sp]
++ cmp ip, #12
++
+ push {r0-r2,r4-r11,lr}
+
+ // Push state x0-x15 onto stack.
+ // Also store an extra copy of x10-x11 just before the state.
+
+- ldr r4, [sp, #48] // iv
+- mov r0, sp
+- sub sp, #80
+-
+- // iv: x12-x15
+- ldm r4, {X12,X13,X14,X15}
+- stmdb r0!, {X12,X13,X14,X15}
++ add X12, r3, #48
++ ldm X12, {X12,X13,X14,X15}
++ push {X12,X13,X14,X15}
++ sub sp, sp, #64
+
+- // key: x4-x11
+- __ldrd X8_X10, X9_X11, r3, 24
++ __ldrd X8_X10, X9_X11, r3, 40
+ __strd X8_X10, X9_X11, sp, 8
+- stmdb r0!, {X8_X10, X9_X11}
+- ldm r3, {X4-X9_X11}
+- stmdb r0!, {X4-X9_X11}
+-
+- // constants: x0-x3
+- adrl X3, .Lexpand_32byte_k
+- ldm X3, {X0-X3}
++ __strd X8_X10, X9_X11, sp, 56
++ ldm r3, {X0-X9_X11}
+ __strd X0, X1, sp, 16
+ __strd X2, X3, sp, 24
++ __strd X4, X5, sp, 32
++ __strd X6, X7, sp, 40
++ __strd X8_X10, X9_X11, sp, 48
+
++ beq 1f
+ _chacha 20
+
+- add sp, #76
++0: add sp, #76
+ pop {r4-r11, pc}
+-ENDPROC(chacha20_arm)
++
++1: _chacha 12
++ b 0b
++ENDPROC(chacha_doarm)
+
+ /*
+- * void hchacha20_arm(const u32 state[16], u32 out[8]);
++ * void hchacha_block_arm(const u32 state[16], u32 out[8], int nrounds);
+ */
+-ENTRY(hchacha20_arm)
++ENTRY(hchacha_block_arm)
+ push {r1,r4-r11,lr}
+
++ cmp r2, #12 // ChaCha12 ?
++
+ mov r14, r0
+ ldmia r14!, {r0-r11} // load x0-x11
+ push {r10-r11} // store x10-x11 to stack
+ ldm r14, {r10-r12,r14} // load x12-x15
+ sub sp, #8
+
++ beq 1f
+ _chacha_permute 20
+
+ // Skip over (unused0-unused1, x10-x11)
+- add sp, #16
++0: add sp, #16
+
+ // Fix up rotations of x12-x15
+ ror X12, X12, #drot
+@@ -458,4 +454,7 @@ ENTRY(hchacha20_arm)
+ stm r4, {X0,X1,X2,X3,X12,X13,X14,X15}
+
+ pop {r4-r11,pc}
+-ENDPROC(hchacha20_arm)
++
++1: _chacha_permute 12
++ b 0b
++ENDPROC(hchacha_block_arm)
+--- a/arch/arm64/crypto/chacha-neon-glue.c
++++ b/arch/arm64/crypto/chacha-neon-glue.c
+@@ -1,5 +1,5 @@
+ /*
+- * ARM NEON accelerated ChaCha and XChaCha stream ciphers,
++ * ARM NEON and scalar accelerated ChaCha and XChaCha stream ciphers,
+ * including ChaCha20 (RFC7539)
+ *
+ * Copyright (C) 2016 - 2017 Linaro, Ltd. <ard.biesheuvel@linaro.org>
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