1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions |
4 | * |
5 | * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> |
6 | */ |
7 | |
8 | #include <crypto/internal/hash.h> |
9 | #include <crypto/internal/simd.h> |
10 | #include <crypto/sha1.h> |
11 | #include <crypto/sha1_base.h> |
12 | #include <linux/cpufeature.h> |
13 | #include <linux/crypto.h> |
14 | #include <linux/module.h> |
15 | |
16 | #include <asm/hwcap.h> |
17 | #include <asm/neon.h> |
18 | #include <asm/simd.h> |
19 | |
20 | #include "sha1.h" |
21 | |
22 | MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions" ); |
23 | MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>" ); |
24 | MODULE_LICENSE("GPL v2" ); |
25 | |
26 | asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src, |
27 | int blocks); |
28 | |
29 | static int sha1_ce_update(struct shash_desc *desc, const u8 *data, |
30 | unsigned int len) |
31 | { |
32 | struct sha1_state *sctx = shash_desc_ctx(desc); |
33 | |
34 | if (!crypto_simd_usable() || |
35 | (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) |
36 | return sha1_update_arm(desc, data, len); |
37 | |
38 | kernel_neon_begin(); |
39 | sha1_base_do_update(desc, data, len, block_fn: sha1_ce_transform); |
40 | kernel_neon_end(); |
41 | |
42 | return 0; |
43 | } |
44 | |
45 | static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, |
46 | unsigned int len, u8 *out) |
47 | { |
48 | if (!crypto_simd_usable()) |
49 | return sha1_finup_arm(desc, data, len, out); |
50 | |
51 | kernel_neon_begin(); |
52 | if (len) |
53 | sha1_base_do_update(desc, data, len, block_fn: sha1_ce_transform); |
54 | sha1_base_do_finalize(desc, block_fn: sha1_ce_transform); |
55 | kernel_neon_end(); |
56 | |
57 | return sha1_base_finish(desc, out); |
58 | } |
59 | |
60 | static int sha1_ce_final(struct shash_desc *desc, u8 *out) |
61 | { |
62 | return sha1_ce_finup(desc, NULL, len: 0, out); |
63 | } |
64 | |
65 | static struct shash_alg alg = { |
66 | .init = sha1_base_init, |
67 | .update = sha1_ce_update, |
68 | .final = sha1_ce_final, |
69 | .finup = sha1_ce_finup, |
70 | .descsize = sizeof(struct sha1_state), |
71 | .digestsize = SHA1_DIGEST_SIZE, |
72 | .base = { |
73 | .cra_name = "sha1" , |
74 | .cra_driver_name = "sha1-ce" , |
75 | .cra_priority = 200, |
76 | .cra_blocksize = SHA1_BLOCK_SIZE, |
77 | .cra_module = THIS_MODULE, |
78 | } |
79 | }; |
80 | |
81 | static int __init sha1_ce_mod_init(void) |
82 | { |
83 | return crypto_register_shash(alg: &alg); |
84 | } |
85 | |
86 | static void __exit sha1_ce_mod_fini(void) |
87 | { |
88 | crypto_unregister_shash(alg: &alg); |
89 | } |
90 | |
91 | module_cpu_feature_match(SHA1, sha1_ce_mod_init); |
92 | module_exit(sha1_ce_mod_fini); |
93 | |