/* * Linux/arm64 port of the OpenSSL SHA256 implementation for AArch64 * * 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 as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #include <asm/hwcap.h> #include <asm/neon.h> #include <asm/simd.h> #include <crypto/internal/hash.h> #include <crypto/sha.h> #include <crypto/sha256_base.h> #include <linux/cryptohash.h> #include <linux/types.h> #include <linux/string.h> MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash for arm64"); MODULE_AUTHOR("Andy Polyakov <appro@openssl.org>"); MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS_CRYPTO("sha224"); MODULE_ALIAS_CRYPTO("sha256"); asmlinkage void sha256_block_data_order(u32 *digest, const void *data, unsigned int num_blks); asmlinkage void sha256_block_neon(u32 *digest, const void *data, unsigned int num_blks); static int sha256_update(struct shash_desc *desc, const u8 *data, unsigned int len) { return sha256_base_do_update(desc, data, len, (sha256_block_fn *)sha256_block_data_order); } static int sha256_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { if (len) sha256_base_do_update(desc, data, len, (sha256_block_fn *)sha256_block_data_order); sha256_base_do_finalize(desc, (sha256_block_fn *)sha256_block_data_order); return sha256_base_finish(desc, out); } static int sha256_final(struct shash_desc *desc, u8 *out) { return sha256_finup(desc, NULL, 0, out); } static struct shash_alg algs[] = { { .digestsize = SHA256_DIGEST_SIZE, .init = sha256_base_init, .update = sha256_update, .final = sha256_final, .finup = sha256_finup, .descsize = sizeof(struct sha256_state), .base.cra_name = "sha256", .base.cra_driver_name = "sha256-arm64", .base.cra_priority = 100, .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, .base.cra_blocksize = SHA256_BLOCK_SIZE, .base.cra_module = THIS_MODULE, }, { .digestsize = SHA224_DIGEST_SIZE, .init = sha224_base_init, .update = sha256_update, .final = sha256_final, .finup = sha256_finup, .descsize = sizeof(struct sha256_state), .base.cra_name = "sha224", .base.cra_driver_name = "sha224-arm64", .base.cra_priority = 100, .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, .base.cra_blocksize = SHA224_BLOCK_SIZE, .base.cra_module = THIS_MODULE, } }; static int sha256_update_neon(struct shash_desc *desc, const u8 *data, unsigned int len) { /* * Stacking and unstacking a substantial slice of the NEON register * file may significantly affect performance for small updates when * executing in interrupt context, so fall back to the scalar code * in that case. */ if (!may_use_simd()) return sha256_base_do_update(desc, data, len, (sha256_block_fn *)sha256_block_data_order); kernel_neon_begin(); sha256_base_do_update(desc, data, len, (sha256_block_fn *)sha256_block_neon); kernel_neon_end(); return 0; } static int sha256_finup_neon(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { if (!may_use_simd()) { if (len) sha256_base_do_update(desc, data, len, (sha256_block_fn *)sha256_block_data_order); sha256_base_do_finalize(desc, (sha256_block_fn *)sha256_block_data_order); } else { kernel_neon_begin(); if (len) sha256_base_do_update(desc, data, len, (sha256_block_fn *)sha256_block_neon); sha256_base_do_finalize(desc, (sha256_block_fn *)sha256_block_neon); kernel_neon_end(); } return sha256_base_finish(desc, out); } static int sha256_final_neon(struct shash_desc *desc, u8 *out) { return sha256_finup_neon(desc, NULL, 0, out); } static struct shash_alg neon_algs[] = { { .digestsize = SHA256_DIGEST_SIZE, .init = sha256_base_init, .update = sha256_update_neon, .final = sha256_final_neon, .finup = sha256_finup_neon, .descsize = sizeof(struct sha256_state), .base.cra_name = "sha256", .base.cra_driver_name = "sha256-arm64-neon", .base.cra_priority = 150, .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, .base.cra_blocksize = SHA256_BLOCK_SIZE, .base.cra_module = THIS_MODULE, }, { .digestsize = SHA224_DIGEST_SIZE, .init = sha224_base_init, .update = sha256_update_neon, .final = sha256_final_neon, .finup = sha256_finup_neon, .descsize = sizeof(struct sha256_state), .base.cra_name = "sha224", .base.cra_driver_name = "sha224-arm64-neon", .base.cra_priority = 150, .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, .base.cra_blocksize = SHA224_BLOCK_SIZE, .base.cra_module = THIS_MODULE, } }; static int __init sha256_mod_init(void) { int ret = crypto_register_shashes(algs, ARRAY_SIZE(algs)); if (ret) return ret; if (elf_hwcap & HWCAP_ASIMD) { ret = crypto_register_shashes(neon_algs, ARRAY_SIZE(neon_algs)); if (ret) crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); } return ret; } static void __exit sha256_mod_fini(void) { if (elf_hwcap & HWCAP_ASIMD) crypto_unregister_shashes(neon_algs, ARRAY_SIZE(neon_algs)); crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); } module_init(sha256_mod_init); module_exit(sha256_mod_fini);