xref: /openbmc/linux/arch/arm/crypto/sha256_glue.c (revision 7baf1151)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Glue code for the SHA256 Secure Hash Algorithm assembly implementation
4  * using optimized ARM assembler and NEON instructions.
5  *
6  * Copyright © 2015 Google Inc.
7  *
8  * This file is based on sha256_ssse3_glue.c:
9  *   Copyright (C) 2013 Intel Corporation
10  *   Author: Tim Chen <tim.c.chen@linux.intel.com>
11  */
12 
13 #include <crypto/internal/hash.h>
14 #include <linux/crypto.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/mm.h>
18 #include <linux/types.h>
19 #include <linux/string.h>
20 #include <crypto/sha2.h>
21 #include <crypto/sha256_base.h>
22 #include <asm/simd.h>
23 #include <asm/neon.h>
24 
25 #include "sha256_glue.h"
26 
27 asmlinkage void sha256_block_data_order(struct sha256_state *state,
28 					const u8 *data, int num_blks);
29 
crypto_sha256_arm_update(struct shash_desc * desc,const u8 * data,unsigned int len)30 int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data,
31 			     unsigned int len)
32 {
33 	/* make sure casting to sha256_block_fn() is safe */
34 	BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
35 
36 	return sha256_base_do_update(desc, data, len, sha256_block_data_order);
37 }
38 EXPORT_SYMBOL(crypto_sha256_arm_update);
39 
crypto_sha256_arm_final(struct shash_desc * desc,u8 * out)40 static int crypto_sha256_arm_final(struct shash_desc *desc, u8 *out)
41 {
42 	sha256_base_do_finalize(desc, sha256_block_data_order);
43 	return sha256_base_finish(desc, out);
44 }
45 
crypto_sha256_arm_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)46 int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
47 			    unsigned int len, u8 *out)
48 {
49 	sha256_base_do_update(desc, data, len, sha256_block_data_order);
50 	return crypto_sha256_arm_final(desc, out);
51 }
52 EXPORT_SYMBOL(crypto_sha256_arm_finup);
53 
54 static struct shash_alg algs[] = { {
55 	.digestsize	=	SHA256_DIGEST_SIZE,
56 	.init		=	sha256_base_init,
57 	.update		=	crypto_sha256_arm_update,
58 	.final		=	crypto_sha256_arm_final,
59 	.finup		=	crypto_sha256_arm_finup,
60 	.descsize	=	sizeof(struct sha256_state),
61 	.base		=	{
62 		.cra_name	=	"sha256",
63 		.cra_driver_name =	"sha256-asm",
64 		.cra_priority	=	150,
65 		.cra_blocksize	=	SHA256_BLOCK_SIZE,
66 		.cra_module	=	THIS_MODULE,
67 	}
68 }, {
69 	.digestsize	=	SHA224_DIGEST_SIZE,
70 	.init		=	sha224_base_init,
71 	.update		=	crypto_sha256_arm_update,
72 	.final		=	crypto_sha256_arm_final,
73 	.finup		=	crypto_sha256_arm_finup,
74 	.descsize	=	sizeof(struct sha256_state),
75 	.base		=	{
76 		.cra_name	=	"sha224",
77 		.cra_driver_name =	"sha224-asm",
78 		.cra_priority	=	150,
79 		.cra_blocksize	=	SHA224_BLOCK_SIZE,
80 		.cra_module	=	THIS_MODULE,
81 	}
82 } };
83 
sha256_mod_init(void)84 static int __init sha256_mod_init(void)
85 {
86 	int res = crypto_register_shashes(algs, ARRAY_SIZE(algs));
87 
88 	if (res < 0)
89 		return res;
90 
91 	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) {
92 		res = crypto_register_shashes(sha256_neon_algs,
93 					      ARRAY_SIZE(sha256_neon_algs));
94 
95 		if (res < 0)
96 			crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
97 	}
98 
99 	return res;
100 }
101 
sha256_mod_fini(void)102 static void __exit sha256_mod_fini(void)
103 {
104 	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
105 
106 	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon())
107 		crypto_unregister_shashes(sha256_neon_algs,
108 					  ARRAY_SIZE(sha256_neon_algs));
109 }
110 
111 module_init(sha256_mod_init);
112 module_exit(sha256_mod_fini);
113 
114 MODULE_LICENSE("GPL");
115 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON");
116 
117 MODULE_ALIAS_CRYPTO("sha256");
118