1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * sha512-ce-glue.c - SHA-384/SHA-512 using ARMv8 Crypto Extensions
4  *
5  * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 
12 #include <asm/neon.h>
13 #include <asm/simd.h>
14 #include <asm/unaligned.h>
15 #include <crypto/internal/hash.h>
16 #include <crypto/internal/simd.h>
17 #include <crypto/sha.h>
18 #include <crypto/sha512_base.h>
19 #include <linux/cpufeature.h>
20 #include <linux/crypto.h>
21 #include <linux/module.h>
22 
23 MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25 MODULE_LICENSE("GPL v2");
26 
27 asmlinkage void sha512_ce_transform(struct sha512_state *sst, u8 const *src,
28 				    int blocks);
29 
30 asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
31 
32 static void __sha512_block_data_order(struct sha512_state *sst, u8 const *src,
33 				      int blocks)
34 {
35 	sha512_block_data_order(sst->state, src, blocks);
36 }
37 
38 static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
39 			    unsigned int len)
40 {
41 	if (!crypto_simd_usable())
42 		return sha512_base_do_update(desc, data, len,
43 					     __sha512_block_data_order);
44 
45 	kernel_neon_begin();
46 	sha512_base_do_update(desc, data, len, sha512_ce_transform);
47 	kernel_neon_end();
48 
49 	return 0;
50 }
51 
52 static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
53 			   unsigned int len, u8 *out)
54 {
55 	if (!crypto_simd_usable()) {
56 		if (len)
57 			sha512_base_do_update(desc, data, len,
58 					      __sha512_block_data_order);
59 		sha512_base_do_finalize(desc, __sha512_block_data_order);
60 		return sha512_base_finish(desc, out);
61 	}
62 
63 	kernel_neon_begin();
64 	sha512_base_do_update(desc, data, len, sha512_ce_transform);
65 	sha512_base_do_finalize(desc, sha512_ce_transform);
66 	kernel_neon_end();
67 	return sha512_base_finish(desc, out);
68 }
69 
70 static int sha512_ce_final(struct shash_desc *desc, u8 *out)
71 {
72 	if (!crypto_simd_usable()) {
73 		sha512_base_do_finalize(desc, __sha512_block_data_order);
74 		return sha512_base_finish(desc, out);
75 	}
76 
77 	kernel_neon_begin();
78 	sha512_base_do_finalize(desc, sha512_ce_transform);
79 	kernel_neon_end();
80 	return sha512_base_finish(desc, out);
81 }
82 
83 static struct shash_alg algs[] = { {
84 	.init			= sha384_base_init,
85 	.update			= sha512_ce_update,
86 	.final			= sha512_ce_final,
87 	.finup			= sha512_ce_finup,
88 	.descsize		= sizeof(struct sha512_state),
89 	.digestsize		= SHA384_DIGEST_SIZE,
90 	.base.cra_name		= "sha384",
91 	.base.cra_driver_name	= "sha384-ce",
92 	.base.cra_priority	= 200,
93 	.base.cra_blocksize	= SHA512_BLOCK_SIZE,
94 	.base.cra_module	= THIS_MODULE,
95 }, {
96 	.init			= sha512_base_init,
97 	.update			= sha512_ce_update,
98 	.final			= sha512_ce_final,
99 	.finup			= sha512_ce_finup,
100 	.descsize		= sizeof(struct sha512_state),
101 	.digestsize		= SHA512_DIGEST_SIZE,
102 	.base.cra_name		= "sha512",
103 	.base.cra_driver_name	= "sha512-ce",
104 	.base.cra_priority	= 200,
105 	.base.cra_blocksize	= SHA512_BLOCK_SIZE,
106 	.base.cra_module	= THIS_MODULE,
107 } };
108 
109 static int __init sha512_ce_mod_init(void)
110 {
111 	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
112 }
113 
114 static void __exit sha512_ce_mod_fini(void)
115 {
116 	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
117 }
118 
119 module_cpu_feature_match(SHA512, sha512_ce_mod_init);
120 module_exit(sha512_ce_mod_fini);
121