Merge branches 'arm/rockchip', 'arm/exynos', 'arm/smmu', 'x86/vt-d', 'x86/amd', ...
[sfrench/cifs-2.6.git] / arch / arm64 / crypto / sha1-ce-glue.c
1 /*
2  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
3  *
4  * Copyright (C) 2014 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 <asm/neon.h>
12 #include <asm/unaligned.h>
13 #include <crypto/internal/hash.h>
14 #include <crypto/sha.h>
15 #include <crypto/sha1_base.h>
16 #include <linux/cpufeature.h>
17 #include <linux/crypto.h>
18 #include <linux/module.h>
19
20 #define ASM_EXPORT(sym, val) \
21         asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val));
22
23 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25 MODULE_LICENSE("GPL v2");
26
27 struct sha1_ce_state {
28         struct sha1_state       sst;
29         u32                     finalize;
30 };
31
32 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
33                                   int blocks);
34
35 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
36                           unsigned int len)
37 {
38         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
39
40         sctx->finalize = 0;
41         kernel_neon_begin_partial(16);
42         sha1_base_do_update(desc, data, len,
43                             (sha1_block_fn *)sha1_ce_transform);
44         kernel_neon_end();
45
46         return 0;
47 }
48
49 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
50                          unsigned int len, u8 *out)
51 {
52         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
53         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
54
55         ASM_EXPORT(sha1_ce_offsetof_count,
56                    offsetof(struct sha1_ce_state, sst.count));
57         ASM_EXPORT(sha1_ce_offsetof_finalize,
58                    offsetof(struct sha1_ce_state, finalize));
59
60         /*
61          * Allow the asm code to perform the finalization if there is no
62          * partial data and the input is a round multiple of the block size.
63          */
64         sctx->finalize = finalize;
65
66         kernel_neon_begin_partial(16);
67         sha1_base_do_update(desc, data, len,
68                             (sha1_block_fn *)sha1_ce_transform);
69         if (!finalize)
70                 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
71         kernel_neon_end();
72         return sha1_base_finish(desc, out);
73 }
74
75 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
76 {
77         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
78
79         sctx->finalize = 0;
80         kernel_neon_begin_partial(16);
81         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
82         kernel_neon_end();
83         return sha1_base_finish(desc, out);
84 }
85
86 static struct shash_alg alg = {
87         .init                   = sha1_base_init,
88         .update                 = sha1_ce_update,
89         .final                  = sha1_ce_final,
90         .finup                  = sha1_ce_finup,
91         .descsize               = sizeof(struct sha1_ce_state),
92         .digestsize             = SHA1_DIGEST_SIZE,
93         .base                   = {
94                 .cra_name               = "sha1",
95                 .cra_driver_name        = "sha1-ce",
96                 .cra_priority           = 200,
97                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
98                 .cra_blocksize          = SHA1_BLOCK_SIZE,
99                 .cra_module             = THIS_MODULE,
100         }
101 };
102
103 static int __init sha1_ce_mod_init(void)
104 {
105         return crypto_register_shash(&alg);
106 }
107
108 static void __exit sha1_ce_mod_fini(void)
109 {
110         crypto_unregister_shash(&alg);
111 }
112
113 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
114 module_exit(sha1_ce_mod_fini);