GNU Linux-libre 4.19.314-gnu1
[releases.git] / arch / arm / crypto / sha256_neon_glue.c
1 /*
2  * Glue code for the SHA256 Secure Hash Algorithm assembly implementation
3  * using NEON instructions.
4  *
5  * Copyright © 2015 Google Inc.
6  *
7  * This file is based on sha512_neon_glue.c:
8  *   Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
9  *
10  * This program is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU General Public License as published by the Free
12  * Software Foundation; either version 2 of the License, or (at your option)
13  * any later version.
14  *
15  */
16
17 #include <crypto/internal/hash.h>
18 #include <linux/cryptohash.h>
19 #include <linux/types.h>
20 #include <linux/string.h>
21 #include <crypto/sha.h>
22 #include <crypto/sha256_base.h>
23 #include <asm/byteorder.h>
24 #include <asm/simd.h>
25 #include <asm/neon.h>
26
27 #include "sha256_glue.h"
28
29 asmlinkage void sha256_block_data_order_neon(u32 *digest, const void *data,
30                                              unsigned int num_blks);
31
32 static int crypto_sha256_neon_update(struct shash_desc *desc, const u8 *data,
33                                      unsigned int len)
34 {
35         struct sha256_state *sctx = shash_desc_ctx(desc);
36
37         if (!may_use_simd() ||
38             (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
39                 return crypto_sha256_arm_update(desc, data, len);
40
41         kernel_neon_begin();
42         sha256_base_do_update(desc, data, len,
43                         (sha256_block_fn *)sha256_block_data_order_neon);
44         kernel_neon_end();
45
46         return 0;
47 }
48
49 static int crypto_sha256_neon_finup(struct shash_desc *desc, const u8 *data,
50                                     unsigned int len, u8 *out)
51 {
52         if (!may_use_simd())
53                 return crypto_sha256_arm_finup(desc, data, len, out);
54
55         kernel_neon_begin();
56         if (len)
57                 sha256_base_do_update(desc, data, len,
58                         (sha256_block_fn *)sha256_block_data_order_neon);
59         sha256_base_do_finalize(desc,
60                         (sha256_block_fn *)sha256_block_data_order_neon);
61         kernel_neon_end();
62
63         return sha256_base_finish(desc, out);
64 }
65
66 static int crypto_sha256_neon_final(struct shash_desc *desc, u8 *out)
67 {
68         return crypto_sha256_neon_finup(desc, NULL, 0, out);
69 }
70
71 struct shash_alg sha256_neon_algs[] = { {
72         .digestsize     =       SHA256_DIGEST_SIZE,
73         .init           =       sha256_base_init,
74         .update         =       crypto_sha256_neon_update,
75         .final          =       crypto_sha256_neon_final,
76         .finup          =       crypto_sha256_neon_finup,
77         .descsize       =       sizeof(struct sha256_state),
78         .base           =       {
79                 .cra_name       =       "sha256",
80                 .cra_driver_name =      "sha256-neon",
81                 .cra_priority   =       250,
82                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
83                 .cra_module     =       THIS_MODULE,
84         }
85 }, {
86         .digestsize     =       SHA224_DIGEST_SIZE,
87         .init           =       sha224_base_init,
88         .update         =       crypto_sha256_neon_update,
89         .final          =       crypto_sha256_neon_final,
90         .finup          =       crypto_sha256_neon_finup,
91         .descsize       =       sizeof(struct sha256_state),
92         .base           =       {
93                 .cra_name       =       "sha224",
94                 .cra_driver_name =      "sha224-neon",
95                 .cra_priority   =       250,
96                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
97                 .cra_module     =       THIS_MODULE,
98         }
99 } };