From 8c28abede16c9396eb90356a4e084d5f3e847886 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Sat, 5 Apr 2025 11:26:04 -0700 Subject: [PATCH] crypto: arm64/chacha - remove the skcipher algorithms Since crypto/chacha.c now registers chacha20-$(ARCH), xchacha20-$(ARCH), and xchacha12-$(ARCH) skcipher algorithms that use the architecture's ChaCha and HChaCha library functions, individual architectures no longer need to do the same. Therefore, remove the redundant skcipher algorithms and leave just the library functions. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu --- arch/arm64/crypto/Kconfig | 7 -- arch/arm64/crypto/chacha-neon-core.S | 2 +- arch/arm64/crypto/chacha-neon-glue.c | 144 ++------------------------- 3 files changed, 7 insertions(+), 146 deletions(-) diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig index 3418c8d3c78d..ce655da0fbee 100644 --- a/arch/arm64/crypto/Kconfig +++ b/arch/arm64/crypto/Kconfig @@ -189,16 +189,9 @@ config CRYPTO_AES_ARM64_NEON_BLK config CRYPTO_CHACHA20_NEON tristate depends on KERNEL_MODE_NEON - select CRYPTO_SKCIPHER select CRYPTO_LIB_CHACHA_GENERIC select CRYPTO_ARCH_HAVE_LIB_CHACHA default CRYPTO_LIB_CHACHA_INTERNAL - help - Length-preserving ciphers: ChaCha20, XChaCha20, and XChaCha12 - stream cipher algorithms - - Architecture: arm64 using: - - NEON (Advanced SIMD) extensions config CRYPTO_AES_ARM64_BS tristate "Ciphers: AES, modes: ECB/CBC/CTR/XCTR/XTS modes (bit-sliced NEON)" diff --git a/arch/arm64/crypto/chacha-neon-core.S b/arch/arm64/crypto/chacha-neon-core.S index b70ac76f2610..80079586ecc7 100644 --- a/arch/arm64/crypto/chacha-neon-core.S +++ b/arch/arm64/crypto/chacha-neon-core.S @@ -1,5 +1,5 @@ /* - * ChaCha/XChaCha NEON helper functions + * ChaCha/HChaCha NEON helper functions * * Copyright (C) 2016-2018 Linaro, Ltd. * diff --git a/arch/arm64/crypto/chacha-neon-glue.c b/arch/arm64/crypto/chacha-neon-glue.c index bb9b52321bda..a0c336b28402 100644 --- a/arch/arm64/crypto/chacha-neon-glue.c +++ b/arch/arm64/crypto/chacha-neon-glue.c @@ -1,6 +1,5 @@ /* - * ARM NEON and scalar accelerated ChaCha and XChaCha stream ciphers, - * including ChaCha20 (RFC7539) + * ChaCha and HChaCha functions (ARM64 optimized) * * Copyright (C) 2016 - 2017 Linaro, Ltd. * @@ -19,10 +18,8 @@ * (at your option) any later version. */ -#include -#include +#include #include -#include #include #include #include @@ -95,117 +92,6 @@ void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, unsigned int bytes, } EXPORT_SYMBOL(chacha_crypt_arch); -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); - - chacha_init(state, ctx->key, iv); - - while (walk.nbytes > 0) { - unsigned int nbytes = walk.nbytes; - - if (nbytes < walk.total) - nbytes = rounddown(nbytes, walk.stride); - - if (!static_branch_likely(&have_neon) || - !crypto_simd_usable()) { - chacha_crypt_generic(state, walk.dst.virt.addr, - walk.src.virt.addr, nbytes, - ctx->nrounds); - } 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 chacha_neon(struct skcipher_request *req) -{ - struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm); - - 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]; - - chacha_init(state, ctx->key, req->iv); - hchacha_block_arch(state, subctx.key, ctx->nrounds); - 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 = 5 * 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 = 5 * 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 = 5 * CHACHA_BLOCK_SIZE, - .setkey = chacha12_setkey, - .encrypt = xchacha_neon, - .decrypt = xchacha_neon, - } -}; - bool chacha_is_arch_optimized(void) { return static_key_enabled(&have_neon); @@ -214,30 +100,12 @@ EXPORT_SYMBOL(chacha_is_arch_optimized); static int __init chacha_simd_mod_init(void) { - if (!cpu_have_named_feature(ASIMD)) - return 0; - - static_branch_enable(&have_neon); - - return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ? - crypto_register_skciphers(algs, ARRAY_SIZE(algs)) : 0; + if (cpu_have_named_feature(ASIMD)) + static_branch_enable(&have_neon); + return 0; } - -static void __exit chacha_simd_mod_fini(void) -{ - if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) && cpu_have_named_feature(ASIMD)) - crypto_unregister_skciphers(algs, ARRAY_SIZE(algs)); -} - arch_initcall(chacha_simd_mod_init); -module_exit(chacha_simd_mod_fini); -MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (NEON accelerated)"); +MODULE_DESCRIPTION("ChaCha and HChaCha functions (ARM64 optimized)"); MODULE_AUTHOR("Ard Biesheuvel "); 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"); -- 2.25.1