1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using |
4 | * ARM NEON instructions. |
5 | * |
6 | * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi> |
7 | * |
8 | * This file is based on sha1_generic.c and sha1_ssse3_glue.c: |
9 | * Copyright (c) Alan Smithee. |
10 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> |
11 | * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> |
12 | * Copyright (c) Mathias Krause <minipli@googlemail.com> |
13 | * Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com> |
14 | */ |
15 | |
16 | #include <crypto/internal/hash.h> |
17 | #include <crypto/internal/simd.h> |
18 | #include <linux/init.h> |
19 | #include <linux/module.h> |
20 | #include <linux/mm.h> |
21 | #include <linux/types.h> |
22 | #include <crypto/sha1.h> |
23 | #include <crypto/sha1_base.h> |
24 | #include <asm/neon.h> |
25 | #include <asm/simd.h> |
26 | |
27 | #include "sha1.h" |
28 | |
29 | asmlinkage void sha1_transform_neon(struct sha1_state *state_h, |
30 | const u8 *data, int rounds); |
31 | |
32 | static int sha1_neon_update(struct shash_desc *desc, const u8 *data, |
33 | unsigned int len) |
34 | { |
35 | struct sha1_state *sctx = shash_desc_ctx(desc); |
36 | |
37 | if (!crypto_simd_usable() || |
38 | (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) |
39 | return sha1_update_arm(desc, data, len); |
40 | |
41 | kernel_neon_begin(); |
42 | sha1_base_do_update(desc, data, len, block_fn: sha1_transform_neon); |
43 | kernel_neon_end(); |
44 | |
45 | return 0; |
46 | } |
47 | |
48 | static int sha1_neon_finup(struct shash_desc *desc, const u8 *data, |
49 | unsigned int len, u8 *out) |
50 | { |
51 | if (!crypto_simd_usable()) |
52 | return sha1_finup_arm(desc, data, len, out); |
53 | |
54 | kernel_neon_begin(); |
55 | if (len) |
56 | sha1_base_do_update(desc, data, len, block_fn: sha1_transform_neon); |
57 | sha1_base_do_finalize(desc, block_fn: sha1_transform_neon); |
58 | kernel_neon_end(); |
59 | |
60 | return sha1_base_finish(desc, out); |
61 | } |
62 | |
63 | static int sha1_neon_final(struct shash_desc *desc, u8 *out) |
64 | { |
65 | return sha1_neon_finup(desc, NULL, len: 0, out); |
66 | } |
67 | |
68 | static struct shash_alg alg = { |
69 | .digestsize = SHA1_DIGEST_SIZE, |
70 | .init = sha1_base_init, |
71 | .update = sha1_neon_update, |
72 | .final = sha1_neon_final, |
73 | .finup = sha1_neon_finup, |
74 | .descsize = sizeof(struct sha1_state), |
75 | .base = { |
76 | .cra_name = "sha1" , |
77 | .cra_driver_name = "sha1-neon" , |
78 | .cra_priority = 250, |
79 | .cra_blocksize = SHA1_BLOCK_SIZE, |
80 | .cra_module = THIS_MODULE, |
81 | } |
82 | }; |
83 | |
84 | static int __init sha1_neon_mod_init(void) |
85 | { |
86 | if (!cpu_has_neon()) |
87 | return -ENODEV; |
88 | |
89 | return crypto_register_shash(alg: &alg); |
90 | } |
91 | |
92 | static void __exit sha1_neon_mod_fini(void) |
93 | { |
94 | crypto_unregister_shash(alg: &alg); |
95 | } |
96 | |
97 | module_init(sha1_neon_mod_init); |
98 | module_exit(sha1_neon_mod_fini); |
99 | |
100 | MODULE_LICENSE("GPL" ); |
101 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated" ); |
102 | MODULE_ALIAS_CRYPTO("sha1" ); |
103 | |