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Linux kernel mirror (for testing)
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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
31const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
32const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
33
34static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
35 unsigned int len)
36{
37 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
38
39 if (!crypto_simd_usable())
40 return crypto_sha1_update(desc, data, len);
41
42 sctx->finalize = 0;
43 kernel_neon_begin();
44 sha1_base_do_update(desc, data, len,
45 (sha1_block_fn *)sha1_ce_transform);
46 kernel_neon_end();
47
48 return 0;
49}
50
51static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
52 unsigned int len, u8 *out)
53{
54 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
55 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
56
57 if (!crypto_simd_usable())
58 return crypto_sha1_finup(desc, data, len, out);
59
60 /*
61 * Allow the asm code to perform the finalization if there is no
62 * partial data and the input is a round multiple of the block size.
63 */
64 sctx->finalize = finalize;
65
66 kernel_neon_begin();
67 sha1_base_do_update(desc, data, len,
68 (sha1_block_fn *)sha1_ce_transform);
69 if (!finalize)
70 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
71 kernel_neon_end();
72 return sha1_base_finish(desc, out);
73}
74
75static int sha1_ce_final(struct shash_desc *desc, u8 *out)
76{
77 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
78
79 if (!crypto_simd_usable())
80 return crypto_sha1_finup(desc, NULL, 0, out);
81
82 sctx->finalize = 0;
83 kernel_neon_begin();
84 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
85 kernel_neon_end();
86 return sha1_base_finish(desc, out);
87}
88
89static struct shash_alg alg = {
90 .init = sha1_base_init,
91 .update = sha1_ce_update,
92 .final = sha1_ce_final,
93 .finup = sha1_ce_finup,
94 .descsize = sizeof(struct sha1_ce_state),
95 .digestsize = SHA1_DIGEST_SIZE,
96 .base = {
97 .cra_name = "sha1",
98 .cra_driver_name = "sha1-ce",
99 .cra_priority = 200,
100 .cra_blocksize = SHA1_BLOCK_SIZE,
101 .cra_module = THIS_MODULE,
102 }
103};
104
105static int __init sha1_ce_mod_init(void)
106{
107 return crypto_register_shash(&alg);
108}
109
110static void __exit sha1_ce_mod_fini(void)
111{
112 crypto_unregister_shash(&alg);
113}
114
115module_cpu_feature_match(SHA1, sha1_ce_mod_init);
116module_exit(sha1_ce_mod_fini);