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Linux kernel mirror (for testing)
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linux
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/cryptohash.h>
19#include <linux/types.h>
20#include <linux/string.h>
21#include <crypto/sha.h>
22#include <crypto/sha256_base.h>
23#include <asm/simd.h>
24#include <asm/neon.h>
25
26#include "sha256_glue.h"
27
28asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
29 unsigned int num_blks);
30
31int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data,
32 unsigned int len)
33{
34 /* make sure casting to sha256_block_fn() is safe */
35 BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
36
37 return sha256_base_do_update(desc, data, len,
38 (sha256_block_fn *)sha256_block_data_order);
39}
40EXPORT_SYMBOL(crypto_sha256_arm_update);
41
42static int crypto_sha256_arm_final(struct shash_desc *desc, u8 *out)
43{
44 sha256_base_do_finalize(desc,
45 (sha256_block_fn *)sha256_block_data_order);
46 return sha256_base_finish(desc, out);
47}
48
49int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
50 unsigned int len, u8 *out)
51{
52 sha256_base_do_update(desc, data, len,
53 (sha256_block_fn *)sha256_block_data_order);
54 return crypto_sha256_arm_final(desc, out);
55}
56EXPORT_SYMBOL(crypto_sha256_arm_finup);
57
58static struct shash_alg algs[] = { {
59 .digestsize = SHA256_DIGEST_SIZE,
60 .init = sha256_base_init,
61 .update = crypto_sha256_arm_update,
62 .final = crypto_sha256_arm_final,
63 .finup = crypto_sha256_arm_finup,
64 .descsize = sizeof(struct sha256_state),
65 .base = {
66 .cra_name = "sha256",
67 .cra_driver_name = "sha256-asm",
68 .cra_priority = 150,
69 .cra_blocksize = SHA256_BLOCK_SIZE,
70 .cra_module = THIS_MODULE,
71 }
72}, {
73 .digestsize = SHA224_DIGEST_SIZE,
74 .init = sha224_base_init,
75 .update = crypto_sha256_arm_update,
76 .final = crypto_sha256_arm_final,
77 .finup = crypto_sha256_arm_finup,
78 .descsize = sizeof(struct sha256_state),
79 .base = {
80 .cra_name = "sha224",
81 .cra_driver_name = "sha224-asm",
82 .cra_priority = 150,
83 .cra_blocksize = SHA224_BLOCK_SIZE,
84 .cra_module = THIS_MODULE,
85 }
86} };
87
88static int __init sha256_mod_init(void)
89{
90 int res = crypto_register_shashes(algs, ARRAY_SIZE(algs));
91
92 if (res < 0)
93 return res;
94
95 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) {
96 res = crypto_register_shashes(sha256_neon_algs,
97 ARRAY_SIZE(sha256_neon_algs));
98
99 if (res < 0)
100 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
101 }
102
103 return res;
104}
105
106static void __exit sha256_mod_fini(void)
107{
108 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
109
110 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon())
111 crypto_unregister_shashes(sha256_neon_algs,
112 ARRAY_SIZE(sha256_neon_algs));
113}
114
115module_init(sha256_mod_init);
116module_exit(sha256_mod_fini);
117
118MODULE_LICENSE("GPL");
119MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON");
120
121MODULE_ALIAS_CRYPTO("sha256");