| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions |
| * |
| * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> |
| */ |
| |
| #include <asm/neon.h> |
| #include <asm/simd.h> |
| #include <asm/unaligned.h> |
| #include <crypto/internal/hash.h> |
| #include <crypto/internal/simd.h> |
| #include <crypto/sha.h> |
| #include <crypto/sha1_base.h> |
| #include <linux/cpufeature.h> |
| #include <linux/crypto.h> |
| #include <linux/module.h> |
| |
| MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); |
| MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); |
| MODULE_LICENSE("GPL v2"); |
| |
| struct sha1_ce_state { |
| struct sha1_state sst; |
| u32 finalize; |
| }; |
| |
| asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, |
| int blocks); |
| |
| static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src, |
| int blocks) |
| { |
| sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src, |
| blocks); |
| } |
| |
| const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); |
| const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); |
| |
| static int sha1_ce_update(struct shash_desc *desc, const u8 *data, |
| unsigned int len) |
| { |
| struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
| |
| if (!crypto_simd_usable()) |
| return crypto_sha1_update(desc, data, len); |
| |
| sctx->finalize = 0; |
| kernel_neon_begin(); |
| sha1_base_do_update(desc, data, len, __sha1_ce_transform); |
| kernel_neon_end(); |
| |
| return 0; |
| } |
| |
| static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, |
| unsigned int len, u8 *out) |
| { |
| struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
| bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len; |
| |
| if (!crypto_simd_usable()) |
| return crypto_sha1_finup(desc, data, len, out); |
| |
| /* |
| * Allow the asm code to perform the finalization if there is no |
| * partial data and the input is a round multiple of the block size. |
| */ |
| sctx->finalize = finalize; |
| |
| kernel_neon_begin(); |
| sha1_base_do_update(desc, data, len, __sha1_ce_transform); |
| if (!finalize) |
| sha1_base_do_finalize(desc, __sha1_ce_transform); |
| kernel_neon_end(); |
| return sha1_base_finish(desc, out); |
| } |
| |
| static int sha1_ce_final(struct shash_desc *desc, u8 *out) |
| { |
| struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
| |
| if (!crypto_simd_usable()) |
| return crypto_sha1_finup(desc, NULL, 0, out); |
| |
| sctx->finalize = 0; |
| kernel_neon_begin(); |
| sha1_base_do_finalize(desc, __sha1_ce_transform); |
| kernel_neon_end(); |
| return sha1_base_finish(desc, out); |
| } |
| |
| static struct shash_alg alg = { |
| .init = sha1_base_init, |
| .update = sha1_ce_update, |
| .final = sha1_ce_final, |
| .finup = sha1_ce_finup, |
| .descsize = sizeof(struct sha1_ce_state), |
| .digestsize = SHA1_DIGEST_SIZE, |
| .base = { |
| .cra_name = "sha1", |
| .cra_driver_name = "sha1-ce", |
| .cra_priority = 200, |
| .cra_blocksize = SHA1_BLOCK_SIZE, |
| .cra_module = THIS_MODULE, |
| } |
| }; |
| |
| static int __init sha1_ce_mod_init(void) |
| { |
| return crypto_register_shash(&alg); |
| } |
| |
| static void __exit sha1_ce_mod_fini(void) |
| { |
| crypto_unregister_shash(&alg); |
| } |
| |
| module_cpu_feature_match(SHA1, sha1_ce_mod_init); |
| module_exit(sha1_ce_mod_fini); |