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gerrit.nordix.org / codeaurora / cp-linux / 439e14b1c7ea1a8cc2e673dd8429ff44f8b834d8 / . / arch / arm64 / crypto / sha2-ce-glue.c
blob: 7cd587564a4176e902f12c7c7043b714caab48ea [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame]1/*
2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
3 *
4 * Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <asm/neon.h>
12#include <asm/unaligned.h>
13#include <crypto/internal/hash.h>
14#include <crypto/sha.h>
15#include <crypto/sha256_base.h>
16#include <linux/cpufeature.h>
17#include <linux/crypto.h>
18#include <linux/module.h>
19
20#define ASM_EXPORT(sym, val) \
21 asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val));
22
23MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
24MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25MODULE_LICENSE("GPL v2");
26
27struct sha256_ce_state {
28 struct sha256_state sst;
29 u32 finalize;
30};
31
32asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
33 int blocks);
34
35static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
36 unsigned int len)
37{
38 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
39
40 sctx->finalize = 0;
41 kernel_neon_begin_partial(28);
42 sha256_base_do_update(desc, data, len,
43 (sha256_block_fn *)sha2_ce_transform);
44 kernel_neon_end();
45
46 return 0;
47}
48
49static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
50 unsigned int len, u8 *out)
51{
52 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
53 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
54
55 ASM_EXPORT(sha256_ce_offsetof_count,
56 offsetof(struct sha256_ce_state, sst.count));
57 ASM_EXPORT(sha256_ce_offsetof_finalize,
58 offsetof(struct sha256_ce_state, finalize));
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_partial(28);
67 sha256_base_do_update(desc, data, len,
68 (sha256_block_fn *)sha2_ce_transform);
69 if (!finalize)
70 sha256_base_do_finalize(desc,
71 (sha256_block_fn *)sha2_ce_transform);
72 kernel_neon_end();
73 return sha256_base_finish(desc, out);
74}
75
76static int sha256_ce_final(struct shash_desc *desc, u8 *out)
77{
78 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
79
80 sctx->finalize = 0;
81 kernel_neon_begin_partial(28);
82 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
83 kernel_neon_end();
84 return sha256_base_finish(desc, out);
85}
86
87static struct shash_alg algs[] = { {
88 .init = sha224_base_init,
89 .update = sha256_ce_update,
90 .final = sha256_ce_final,
91 .finup = sha256_ce_finup,
92 .descsize = sizeof(struct sha256_ce_state),
93 .digestsize = SHA224_DIGEST_SIZE,
94 .base = {
95 .cra_name = "sha224",
96 .cra_driver_name = "sha224-ce",
97 .cra_priority = 200,
98 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
99 .cra_blocksize = SHA256_BLOCK_SIZE,
100 .cra_module = THIS_MODULE,
101 }
102}, {
103 .init = sha256_base_init,
104 .update = sha256_ce_update,
105 .final = sha256_ce_final,
106 .finup = sha256_ce_finup,
107 .descsize = sizeof(struct sha256_ce_state),
108 .digestsize = SHA256_DIGEST_SIZE,
109 .base = {
110 .cra_name = "sha256",
111 .cra_driver_name = "sha256-ce",
112 .cra_priority = 200,
113 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
114 .cra_blocksize = SHA256_BLOCK_SIZE,
115 .cra_module = THIS_MODULE,
116 }
117} };
118
119static int __init sha2_ce_mod_init(void)
120{
121 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
122}
123
124static void __exit sha2_ce_mod_fini(void)
125{
126 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
127}
128
129module_cpu_feature_match(SHA2, sha2_ce_mod_init);
130module_exit(sha2_ce_mod_fini);