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		return crypto_sm3_update(desc, data, len);
31
32	kernel_neon_begin();
33	sm3_base_do_update(desc, data, len, sm3_ce_transform);
34	kernel_neon_end();
35
36	return 0;
37}
38
39static int sm3_ce_final(struct shash_desc *desc, u8 *out)
40{
41	if (!crypto_simd_usable())
42		return crypto_sm3_finup(desc, NULL, 0, out);
43
44	kernel_neon_begin();
45	sm3_base_do_finalize(desc, sm3_ce_transform);
46	kernel_neon_end();
47
48	return sm3_base_finish(desc, out);
49}
50
51static int sm3_ce_finup(struct shash_desc *desc, const u8 *data,
52			unsigned int len, u8 *out)
53{
54	if (!crypto_simd_usable())
55		return crypto_sm3_finup(desc, data, len, out);
56
57	kernel_neon_begin();
58	sm3_base_do_update(desc, data, len, sm3_ce_transform);
59	kernel_neon_end();
60
61	return sm3_ce_final(desc, out);
62}
63
64static struct shash_alg sm3_alg = {
65	.digestsize		= SM3_DIGEST_SIZE,
66	.init			= sm3_base_init,
67	.update			= sm3_ce_update,
68	.final			= sm3_ce_final,
69	.finup			= sm3_ce_finup,
70	.descsize		= sizeof(struct sm3_state),
71	.base.cra_name		= "sm3",
72	.base.cra_driver_name	= "sm3-ce",
73	.base.cra_blocksize	= SM3_BLOCK_SIZE,
74	.base.cra_module	= THIS_MODULE,
75	.base.cra_priority	= 200,
76};
77
78static int __init sm3_ce_mod_init(void)
79{
80	return crypto_register_shash(&sm3_alg);
81}
82
83static void __exit sm3_ce_mod_fini(void)
84{
85	crypto_unregister_shash(&sm3_alg);
86}
87
88module_cpu_feature_match(SM3, sm3_ce_mod_init);
89module_exit(sm3_ce_mod_fini);
90