1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
4  *
5  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
6  */
7 
8 #include <crypto/internal/hash.h>
9 #include <crypto/internal/simd.h>
10 #include <crypto/sha1.h>
11 #include <crypto/sha1_base.h>
12 #include <linux/cpufeature.h>
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 
16 #include <asm/hwcap.h>
17 #include <asm/neon.h>
18 #include <asm/simd.h>
19 
20 #include "sha1.h"
21 
22 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
24 MODULE_LICENSE("GPL v2");
25 
26 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
27 				  int blocks);
28 
sha1_ce_update(struct shash_desc * desc,const u8 * data,unsigned int len)29 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
30 			  unsigned int len)
31 {
32 	struct sha1_state *sctx = shash_desc_ctx(desc);
33 
34 	if (!crypto_simd_usable() ||
35 	    (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
36 		return sha1_update_arm(desc, data, len);
37 
38 	kernel_neon_begin();
39 	sha1_base_do_update(desc, data, len, sha1_ce_transform);
40 	kernel_neon_end();
41 
42 	return 0;
43 }
44 
sha1_ce_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)45 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
46 			 unsigned int len, u8 *out)
47 {
48 	if (!crypto_simd_usable())
49 		return sha1_finup_arm(desc, data, len, out);
50 
51 	kernel_neon_begin();
52 	if (len)
53 		sha1_base_do_update(desc, data, len, sha1_ce_transform);
54 	sha1_base_do_finalize(desc, sha1_ce_transform);
55 	kernel_neon_end();
56 
57 	return sha1_base_finish(desc, out);
58 }
59 
sha1_ce_final(struct shash_desc * desc,u8 * out)60 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
61 {
62 	return sha1_ce_finup(desc, NULL, 0, out);
63 }
64 
65 static struct shash_alg alg = {
66 	.init			= sha1_base_init,
67 	.update			= sha1_ce_update,
68 	.final			= sha1_ce_final,
69 	.finup			= sha1_ce_finup,
70 	.descsize		= sizeof(struct sha1_state),
71 	.digestsize		= SHA1_DIGEST_SIZE,
72 	.base			= {
73 		.cra_name		= "sha1",
74 		.cra_driver_name	= "sha1-ce",
75 		.cra_priority		= 200,
76 		.cra_blocksize		= SHA1_BLOCK_SIZE,
77 		.cra_module		= THIS_MODULE,
78 	}
79 };
80 
sha1_ce_mod_init(void)81 static int __init sha1_ce_mod_init(void)
82 {
83 	return crypto_register_shash(&alg);
84 }
85 
sha1_ce_mod_fini(void)86 static void __exit sha1_ce_mod_fini(void)
87 {
88 	crypto_unregister_shash(&alg);
89 }
90 
91 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
92 module_exit(sha1_ce_mod_fini);
93