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
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
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
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
81 static int __init sha1_ce_mod_init(void)
82 {
83 return crypto_register_shash(&alg);
84 }
85
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
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