Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[sfrench/cifs-2.6.git] / arch / arm / crypto / sha2-ce-glue.c
1 /*
2  * sha2-ce-glue.c - SHA-224/SHA-256 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/sha256_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/simd.h>
21 #include <asm/neon.h>
22 #include <asm/unaligned.h>
23
24 #include "sha256_glue.h"
25
26 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
27 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
28 MODULE_LICENSE("GPL v2");
29
30 asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
31                                   int blocks);
32
33 static int sha2_ce_update(struct shash_desc *desc, const u8 *data,
34                           unsigned int len)
35 {
36         struct sha256_state *sctx = shash_desc_ctx(desc);
37
38         if (!crypto_simd_usable() ||
39             (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
40                 return crypto_sha256_arm_update(desc, data, len);
41
42         kernel_neon_begin();
43         sha256_base_do_update(desc, data, len,
44                               (sha256_block_fn *)sha2_ce_transform);
45         kernel_neon_end();
46
47         return 0;
48 }
49
50 static int sha2_ce_finup(struct shash_desc *desc, const u8 *data,
51                          unsigned int len, u8 *out)
52 {
53         if (!crypto_simd_usable())
54                 return crypto_sha256_arm_finup(desc, data, len, out);
55
56         kernel_neon_begin();
57         if (len)
58                 sha256_base_do_update(desc, data, len,
59                                       (sha256_block_fn *)sha2_ce_transform);
60         sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
61         kernel_neon_end();
62
63         return sha256_base_finish(desc, out);
64 }
65
66 static int sha2_ce_final(struct shash_desc *desc, u8 *out)
67 {
68         return sha2_ce_finup(desc, NULL, 0, out);
69 }
70
71 static struct shash_alg algs[] = { {
72         .init                   = sha224_base_init,
73         .update                 = sha2_ce_update,
74         .final                  = sha2_ce_final,
75         .finup                  = sha2_ce_finup,
76         .descsize               = sizeof(struct sha256_state),
77         .digestsize             = SHA224_DIGEST_SIZE,
78         .base                   = {
79                 .cra_name               = "sha224",
80                 .cra_driver_name        = "sha224-ce",
81                 .cra_priority           = 300,
82                 .cra_blocksize          = SHA256_BLOCK_SIZE,
83                 .cra_module             = THIS_MODULE,
84         }
85 }, {
86         .init                   = sha256_base_init,
87         .update                 = sha2_ce_update,
88         .final                  = sha2_ce_final,
89         .finup                  = sha2_ce_finup,
90         .descsize               = sizeof(struct sha256_state),
91         .digestsize             = SHA256_DIGEST_SIZE,
92         .base                   = {
93                 .cra_name               = "sha256",
94                 .cra_driver_name        = "sha256-ce",
95                 .cra_priority           = 300,
96                 .cra_blocksize          = SHA256_BLOCK_SIZE,
97                 .cra_module             = THIS_MODULE,
98         }
99 } };
100
101 static int __init sha2_ce_mod_init(void)
102 {
103         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
104 }
105
106 static void __exit sha2_ce_mod_fini(void)
107 {
108         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
109 }
110
111 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
112 module_exit(sha2_ce_mod_fini);