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 
20 asmlinkage void sm3_neon_transform(struct sm3_state *sst, u8 const *src,
21 				   int blocks);
22 
sm3_neon_update(struct shash_desc * desc,const u8 * data,unsigned int len)23 static 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 
sm3_neon_final(struct shash_desc * desc,u8 * out)38 static 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 
sm3_neon_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)52 static 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 
73 static 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 
sm3_neon_init(void)87 static int __init sm3_neon_init(void)
88 {
89 	return crypto_register_shash(&sm3_alg);
90 }
91 
sm3_neon_fini(void)92 static void __exit sm3_neon_fini(void)
93 {
94 	crypto_unregister_shash(&sm3_alg);
95 }
96 
97 module_init(sm3_neon_init);
98 module_exit(sm3_neon_fini);
99 
100 MODULE_DESCRIPTION("SM3 secure hash using NEON instructions");
101 MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>");
102 MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@linux.alibaba.com>");
103 MODULE_LICENSE("GPL v2");
104