1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sm3-neon-glue.c - SM3 secure hash using NEON instructions
4 *
5 * Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
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
20asmlinkage void sm3_neon_transform(struct sm3_state *sst, u8 const *src,
21				   int blocks);
22
23static int sm3_neon_update(struct shash_desc *desc, const u8 *data,
24			   unsigned int len)
25{
26	if (!crypto_simd_usable()) {
27		sm3_update(shash_desc_ctx(desc), data, len);
28		return 0;
29	}
30
31	kernel_neon_begin();
32	sm3_base_do_update(desc, data, len, sm3_neon_transform);
33	kernel_neon_end();
34
35	return 0;
36}
37
38static int sm3_neon_final(struct shash_desc *desc, u8 *out)
39{
40	if (!crypto_simd_usable()) {
41		sm3_final(shash_desc_ctx(desc), out);
42		return 0;
43	}
44
45	kernel_neon_begin();
46	sm3_base_do_finalize(desc, sm3_neon_transform);
47	kernel_neon_end();
48
49	return sm3_base_finish(desc, out);
50}
51
52static int sm3_neon_finup(struct shash_desc *desc, const u8 *data,
53			  unsigned int len, u8 *out)
54{
55	if (!crypto_simd_usable()) {
56		struct sm3_state *sctx = shash_desc_ctx(desc);
57
58		if (len)
59			sm3_update(sctx, data, len);
60		sm3_final(sctx, out);
61		return 0;
62	}
63
64	kernel_neon_begin();
65	if (len)
66		sm3_base_do_update(desc, data, len, sm3_neon_transform);
67	sm3_base_do_finalize(desc, sm3_neon_transform);
68	kernel_neon_end();
69
70	return sm3_base_finish(desc, out);
71}
72
73static struct shash_alg sm3_alg = {
74	.digestsize		= SM3_DIGEST_SIZE,
75	.init			= sm3_base_init,
76	.update			= sm3_neon_update,
77	.final			= sm3_neon_final,
78	.finup			= sm3_neon_finup,
79	.descsize		= sizeof(struct sm3_state),
80	.base.cra_name		= "sm3",
81	.base.cra_driver_name	= "sm3-neon",
82	.base.cra_blocksize	= SM3_BLOCK_SIZE,
83	.base.cra_module	= THIS_MODULE,
84	.base.cra_priority	= 200,
85};
86
87static int __init sm3_neon_init(void)
88{
89	return crypto_register_shash(&sm3_alg);
90}
91
92static void __exit sm3_neon_fini(void)
93{
94	crypto_unregister_shash(&sm3_alg);
95}
96
97module_init(sm3_neon_init);
98module_exit(sm3_neon_fini);
99
100MODULE_DESCRIPTION("SM3 secure hash using NEON instructions");
101MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>");
102MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@linux.alibaba.com>");
103MODULE_LICENSE("GPL v2");
104