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crypto: arm64 - cleanup comments
[uclinux-h8/linux.git] / arch / arm64 / crypto / sha512-ce-glue.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * sha512-ce-glue.c - SHA-384/SHA-512 using ARMv8 Crypto Extensions
4  *
5  * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11
12 #include <asm/neon.h>
13 #include <asm/simd.h>
14 #include <asm/unaligned.h>
15 #include <crypto/internal/hash.h>
16 #include <crypto/internal/simd.h>
17 #include <crypto/sha2.h>
18 #include <crypto/sha512_base.h>
19 #include <linux/cpufeature.h>
20 #include <linux/crypto.h>
21 #include <linux/module.h>
22
23 MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25 MODULE_LICENSE("GPL v2");
26 MODULE_ALIAS_CRYPTO("sha384");
27 MODULE_ALIAS_CRYPTO("sha512");
28
29 asmlinkage int sha512_ce_transform(struct sha512_state *sst, u8 const *src,
30                                    int blocks);
31
32 asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
33
34 static void __sha512_ce_transform(struct sha512_state *sst, u8 const *src,
35                                   int blocks)
36 {
37         while (blocks) {
38                 int rem;
39
40                 kernel_neon_begin();
41                 rem = sha512_ce_transform(sst, src, blocks);
42                 kernel_neon_end();
43                 src += (blocks - rem) * SHA512_BLOCK_SIZE;
44                 blocks = rem;
45         }
46 }
47
48 static void __sha512_block_data_order(struct sha512_state *sst, u8 const *src,
49                                       int blocks)
50 {
51         sha512_block_data_order(sst->state, src, blocks);
52 }
53
54 static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
55                             unsigned int len)
56 {
57         sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
58                                                    : __sha512_block_data_order;
59
60         sha512_base_do_update(desc, data, len, fn);
61         return 0;
62 }
63
64 static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
65                            unsigned int len, u8 *out)
66 {
67         sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
68                                                    : __sha512_block_data_order;
69
70         sha512_base_do_update(desc, data, len, fn);
71         sha512_base_do_finalize(desc, fn);
72         return sha512_base_finish(desc, out);
73 }
74
75 static int sha512_ce_final(struct shash_desc *desc, u8 *out)
76 {
77         sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
78                                                    : __sha512_block_data_order;
79
80         sha512_base_do_finalize(desc, fn);
81         return sha512_base_finish(desc, out);
82 }
83
84 static struct shash_alg algs[] = { {
85         .init                   = sha384_base_init,
86         .update                 = sha512_ce_update,
87         .final                  = sha512_ce_final,
88         .finup                  = sha512_ce_finup,
89         .descsize               = sizeof(struct sha512_state),
90         .digestsize             = SHA384_DIGEST_SIZE,
91         .base.cra_name          = "sha384",
92         .base.cra_driver_name   = "sha384-ce",
93         .base.cra_priority      = 200,
94         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
95         .base.cra_module        = THIS_MODULE,
96 }, {
97         .init                   = sha512_base_init,
98         .update                 = sha512_ce_update,
99         .final                  = sha512_ce_final,
100         .finup                  = sha512_ce_finup,
101         .descsize               = sizeof(struct sha512_state),
102         .digestsize             = SHA512_DIGEST_SIZE,
103         .base.cra_name          = "sha512",
104         .base.cra_driver_name   = "sha512-ce",
105         .base.cra_priority      = 200,
106         .base.cra_blocksize     = SHA512_BLOCK_SIZE,
107         .base.cra_module        = THIS_MODULE,
108 } };
109
110 static int __init sha512_ce_mod_init(void)
111 {
112         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
113 }
114
115 static void __exit sha512_ce_mod_fini(void)
116 {
117         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
118 }
119
120 module_cpu_feature_match(SHA512, sha512_ce_mod_init);
121 module_exit(sha512_ce_mod_fini);