tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
6 */
7
8#include <asm/neon.h>
9#include <asm/simd.h>
10#include <asm/unaligned.h>
11#include <crypto/internal/hash.h>
12#include <crypto/internal/simd.h>
13#include <crypto/sha.h>
14#include <crypto/sha1_base.h>
15#include <linux/cpufeature.h>
16#include <linux/crypto.h>
17#include <linux/module.h>
18
19MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
20MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21MODULE_LICENSE("GPL v2");
22
23struct sha1_ce_state {
24 struct sha1_state sst;
25 u32 finalize;
26};
27
28asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
29 int blocks);
30
31static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src,
32 int blocks)
33{
34 sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src,
35 blocks);
36}
37
38const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
39const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
40
41static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
42 unsigned int len)
43{
44 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
45
46 if (!crypto_simd_usable())
47 return crypto_sha1_update(desc, data, len);
48
49 sctx->finalize = 0;
50 kernel_neon_begin();
51 sha1_base_do_update(desc, data, len, __sha1_ce_transform);
52 kernel_neon_end();
53
54 return 0;
55}
56
57static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
58 unsigned int len, u8 *out)
59{
60 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
61 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
62
63 if (!crypto_simd_usable())
64 return crypto_sha1_finup(desc, data, len, out);
65
66 /*
67 * Allow the asm code to perform the finalization if there is no
68 * partial data and the input is a round multiple of the block size.
69 */
70 sctx->finalize = finalize;
71
72 kernel_neon_begin();
73 sha1_base_do_update(desc, data, len, __sha1_ce_transform);
74 if (!finalize)
75 sha1_base_do_finalize(desc, __sha1_ce_transform);
76 kernel_neon_end();
77 return sha1_base_finish(desc, out);
78}
79
80static int sha1_ce_final(struct shash_desc *desc, u8 *out)
81{
82 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
83
84 if (!crypto_simd_usable())
85 return crypto_sha1_finup(desc, NULL, 0, out);
86
87 sctx->finalize = 0;
88 kernel_neon_begin();
89 sha1_base_do_finalize(desc, __sha1_ce_transform);
90 kernel_neon_end();
91 return sha1_base_finish(desc, out);
92}
93
94static struct shash_alg alg = {
95 .init = sha1_base_init,
96 .update = sha1_ce_update,
97 .final = sha1_ce_final,
98 .finup = sha1_ce_finup,
99 .descsize = sizeof(struct sha1_ce_state),
100 .digestsize = SHA1_DIGEST_SIZE,
101 .base = {
102 .cra_name = "sha1",
103 .cra_driver_name = "sha1-ce",
104 .cra_priority = 200,
105 .cra_blocksize = SHA1_BLOCK_SIZE,
106 .cra_module = THIS_MODULE,
107 }
108};
109
110static int __init sha1_ce_mod_init(void)
111{
112 return crypto_register_shash(&alg);
113}
114
115static void __exit sha1_ce_mod_fini(void)
116{
117 crypto_unregister_shash(&alg);
118}
119
120module_cpu_feature_match(SHA1, sha1_ce_mod_init);
121module_exit(sha1_ce_mod_fini);