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, 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, sha1_transform_neon);
57 sha1_base_do_finalize(desc, 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, 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);
90 }
91
92 static void __exit sha1_neon_mod_fini(void)
93 {
94 crypto_unregister_shash(&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
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