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
19MODULE_DESCRIPTION("SM3 secure hash using ARMv8 Crypto Extensions");
20MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21MODULE_LICENSE("GPL v2");
22
23asmlinkage void sm3_ce_transform(struct sm3_state *sst, u8 const *src,
24				 int blocks);
25
26static 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
41static 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
55static 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
76static 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
90static int __init sm3_ce_mod_init(void)
91{
92	return crypto_register_shash(&sm3_alg);
93}
94
95static void __exit sm3_ce_mod_fini(void)
96{
97	crypto_unregister_shash(&sm3_alg);
98}
99
100module_cpu_feature_match(SM3, sm3_ce_mod_init);
101module_exit(sm3_ce_mod_fini);
102