Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[sfrench/cifs-2.6.git] / arch / arm / crypto / sha1-ce-glue.c
1 /*
2  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
3  *
4  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <crypto/internal/hash.h>
12 #include <crypto/internal/simd.h>
13 #include <crypto/sha.h>
14 #include <crypto/sha1_base.h>
15 #include <linux/cpufeature.h>
16 #include <linux/crypto.h>
17 #include <linux/module.h>
18
19 #include <asm/hwcap.h>
20 #include <asm/neon.h>
21 #include <asm/simd.h>
22
23 #include "sha1.h"
24
25 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
26 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
27 MODULE_LICENSE("GPL v2");
28
29 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
30                                   int blocks);
31
32 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
33                           unsigned int len)
34 {
35         struct sha1_state *sctx = shash_desc_ctx(desc);
36
37         if (!crypto_simd_usable() ||
38             (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
39                 return sha1_update_arm(desc, data, len);
40
41         kernel_neon_begin();
42         sha1_base_do_update(desc, data, len, sha1_ce_transform);
43         kernel_neon_end();
44
45         return 0;
46 }
47
48 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
49                          unsigned int len, u8 *out)
50 {
51         if (!crypto_simd_usable())
52                 return sha1_finup_arm(desc, data, len, out);
53
54         kernel_neon_begin();
55         if (len)
56                 sha1_base_do_update(desc, data, len, sha1_ce_transform);
57         sha1_base_do_finalize(desc, sha1_ce_transform);
58         kernel_neon_end();
59
60         return sha1_base_finish(desc, out);
61 }
62
63 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
64 {
65         return sha1_ce_finup(desc, NULL, 0, out);
66 }
67
68 static struct shash_alg alg = {
69         .init                   = sha1_base_init,
70         .update                 = sha1_ce_update,
71         .final                  = sha1_ce_final,
72         .finup                  = sha1_ce_finup,
73         .descsize               = sizeof(struct sha1_state),
74         .digestsize             = SHA1_DIGEST_SIZE,
75         .base                   = {
76                 .cra_name               = "sha1",
77                 .cra_driver_name        = "sha1-ce",
78                 .cra_priority           = 200,
79                 .cra_blocksize          = SHA1_BLOCK_SIZE,
80                 .cra_module             = THIS_MODULE,
81         }
82 };
83
84 static int __init sha1_ce_mod_init(void)
85 {
86         return crypto_register_shash(&alg);
87 }
88
89 static void __exit sha1_ce_mod_fini(void)
90 {
91         crypto_unregister_shash(&alg);
92 }
93
94 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
95 module_exit(sha1_ce_mod_fini);