1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Glue code for the SHA256 Secure Hash Algorithm assembly implementation |
4 | * using optimized ARM assembler and NEON instructions. |
5 | * |
6 | * Copyright © 2015 Google Inc. |
7 | * |
8 | * This file is based on sha256_ssse3_glue.c: |
9 | * Copyright (C) 2013 Intel Corporation |
10 | * Author: Tim Chen <tim.c.chen@linux.intel.com> |
11 | */ |
12 | |
13 | #include <crypto/internal/hash.h> |
14 | #include <linux/crypto.h> |
15 | #include <linux/init.h> |
16 | #include <linux/module.h> |
17 | #include <linux/mm.h> |
18 | #include <linux/types.h> |
19 | #include <linux/string.h> |
20 | #include <crypto/sha2.h> |
21 | #include <crypto/sha256_base.h> |
22 | #include <asm/simd.h> |
23 | #include <asm/neon.h> |
24 | |
25 | #include "sha256_glue.h" |
26 | |
27 | asmlinkage void sha256_block_data_order(struct sha256_state *state, |
28 | const u8 *data, int num_blks); |
29 | |
30 | int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data, |
31 | unsigned int len) |
32 | { |
33 | /* make sure casting to sha256_block_fn() is safe */ |
34 | BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0); |
35 | |
36 | return sha256_base_do_update(desc, data, len, block_fn: sha256_block_data_order); |
37 | } |
38 | EXPORT_SYMBOL(crypto_sha256_arm_update); |
39 | |
40 | static int crypto_sha256_arm_final(struct shash_desc *desc, u8 *out) |
41 | { |
42 | sha256_base_do_finalize(desc, block_fn: sha256_block_data_order); |
43 | return sha256_base_finish(desc, out); |
44 | } |
45 | |
46 | int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data, |
47 | unsigned int len, u8 *out) |
48 | { |
49 | sha256_base_do_update(desc, data, len, block_fn: sha256_block_data_order); |
50 | return crypto_sha256_arm_final(desc, out); |
51 | } |
52 | EXPORT_SYMBOL(crypto_sha256_arm_finup); |
53 | |
54 | static struct shash_alg algs[] = { { |
55 | .digestsize = SHA256_DIGEST_SIZE, |
56 | .init = sha256_base_init, |
57 | .update = crypto_sha256_arm_update, |
58 | .final = crypto_sha256_arm_final, |
59 | .finup = crypto_sha256_arm_finup, |
60 | .descsize = sizeof(struct sha256_state), |
61 | .base = { |
62 | .cra_name = "sha256" , |
63 | .cra_driver_name = "sha256-asm" , |
64 | .cra_priority = 150, |
65 | .cra_blocksize = SHA256_BLOCK_SIZE, |
66 | .cra_module = THIS_MODULE, |
67 | } |
68 | }, { |
69 | .digestsize = SHA224_DIGEST_SIZE, |
70 | .init = sha224_base_init, |
71 | .update = crypto_sha256_arm_update, |
72 | .final = crypto_sha256_arm_final, |
73 | .finup = crypto_sha256_arm_finup, |
74 | .descsize = sizeof(struct sha256_state), |
75 | .base = { |
76 | .cra_name = "sha224" , |
77 | .cra_driver_name = "sha224-asm" , |
78 | .cra_priority = 150, |
79 | .cra_blocksize = SHA224_BLOCK_SIZE, |
80 | .cra_module = THIS_MODULE, |
81 | } |
82 | } }; |
83 | |
84 | static int __init sha256_mod_init(void) |
85 | { |
86 | int res = crypto_register_shashes(algs, ARRAY_SIZE(algs)); |
87 | |
88 | if (res < 0) |
89 | return res; |
90 | |
91 | if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) { |
92 | res = crypto_register_shashes(algs: sha256_neon_algs, |
93 | ARRAY_SIZE(sha256_neon_algs)); |
94 | |
95 | if (res < 0) |
96 | crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); |
97 | } |
98 | |
99 | return res; |
100 | } |
101 | |
102 | static void __exit sha256_mod_fini(void) |
103 | { |
104 | crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); |
105 | |
106 | if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) |
107 | crypto_unregister_shashes(algs: sha256_neon_algs, |
108 | ARRAY_SIZE(sha256_neon_algs)); |
109 | } |
110 | |
111 | module_init(sha256_mod_init); |
112 | module_exit(sha256_mod_fini); |
113 | |
114 | MODULE_LICENSE("GPL" ); |
115 | MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON" ); |
116 | |
117 | MODULE_ALIAS_CRYPTO("sha256" ); |
118 | |