1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * sm3-ce-glue.c - SM3 secure hash using ARMv8.2 Crypto Extensions
4 *
5 * Copyright (C) 2018 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/sm3.h>
14 #include <crypto/sm3_base.h>
15 #include <linux/cpufeature.h>
16 #include <linux/crypto.h>
17 #include <linux/module.h>
18
19 MODULE_DESCRIPTION("SM3 secure hash using ARMv8 Crypto Extensions");
20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21 MODULE_LICENSE("GPL v2");
22
23 asmlinkage void sm3_ce_transform(struct sm3_state *sst, u8 const *src,
24 int blocks);
25
26 static int sm3_ce_update(struct shash_desc *desc, const u8 *data,
27 unsigned int len)
28 {
29 if (!crypto_simd_usable()) {
30 sm3_update(shash_desc_ctx(desc), data, len);
31 return 0;
32 }
33
34 kernel_neon_begin();
35 sm3_base_do_update(desc, data, len, sm3_ce_transform);
36 kernel_neon_end();
37
38 return 0;
39 }
40
41 static int sm3_ce_final(struct shash_desc *desc, u8 *out)
42 {
43 if (!crypto_simd_usable()) {
44 sm3_final(shash_desc_ctx(desc), out);
45 return 0;
46 }
47
48 kernel_neon_begin();
49 sm3_base_do_finalize(desc, sm3_ce_transform);
50 kernel_neon_end();
51
52 return sm3_base_finish(desc, out);
53 }
54
55 static int sm3_ce_finup(struct shash_desc *desc, const u8 *data,
56 unsigned int len, u8 *out)
57 {
58 if (!crypto_simd_usable()) {
59 struct sm3_state *sctx = shash_desc_ctx(desc);
60
61 if (len)
62 sm3_update(sctx, data, len);
63 sm3_final(sctx, out);
64 return 0;
65 }
66
67 kernel_neon_begin();
68 if (len)
69 sm3_base_do_update(desc, data, len, sm3_ce_transform);
70 sm3_base_do_finalize(desc, sm3_ce_transform);
71 kernel_neon_end();
72
73 return sm3_base_finish(desc, out);
74 }
75
76 static struct shash_alg sm3_alg = {
77 .digestsize = SM3_DIGEST_SIZE,
78 .init = sm3_base_init,
79 .update = sm3_ce_update,
80 .final = sm3_ce_final,
81 .finup = sm3_ce_finup,
82 .descsize = sizeof(struct sm3_state),
83 .base.cra_name = "sm3",
84 .base.cra_driver_name = "sm3-ce",
85 .base.cra_blocksize = SM3_BLOCK_SIZE,
86 .base.cra_module = THIS_MODULE,
87 .base.cra_priority = 400,
88 };
89
90 static int __init sm3_ce_mod_init(void)
91 {
92 return crypto_register_shash(&sm3_alg);
93 }
94
95 static void __exit sm3_ce_mod_fini(void)
96 {
97 crypto_unregister_shash(&sm3_alg);
98 }
99
100 module_cpu_feature_match(SM3, sm3_ce_mod_init);
101 module_exit(sm3_ce_mod_fini);
102
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