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6ba6c74d AB |
1 | /* |
2 | * sha2-ce-glue.c - SHA-224/SHA-256 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> | |
03802f6a | 15 | #include <crypto/sha256_base.h> |
6ba6c74d AB |
16 | #include <linux/cpufeature.h> |
17 | #include <linux/crypto.h> | |
18 | #include <linux/module.h> | |
19 | ||
03802f6a AB |
20 | #define ASM_EXPORT(sym, val) \ |
21 | asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val)); | |
22 | ||
6ba6c74d AB |
23 | MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); |
24 | MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); | |
25 | MODULE_LICENSE("GPL v2"); | |
26 | ||
03802f6a AB |
27 | struct sha256_ce_state { |
28 | struct sha256_state sst; | |
29 | u32 finalize; | |
30 | }; | |
6ba6c74d | 31 | |
03802f6a AB |
32 | asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src, |
33 | int blocks); | |
6ba6c74d | 34 | |
03802f6a AB |
35 | static int sha256_ce_update(struct shash_desc *desc, const u8 *data, |
36 | unsigned int len) | |
6ba6c74d | 37 | { |
03802f6a | 38 | struct sha256_ce_state *sctx = shash_desc_ctx(desc); |
6ba6c74d | 39 | |
03802f6a AB |
40 | sctx->finalize = 0; |
41 | kernel_neon_begin_partial(28); | |
42 | sha256_base_do_update(desc, data, len, | |
43 | (sha256_block_fn *)sha2_ce_transform); | |
44 | kernel_neon_end(); | |
6ba6c74d | 45 | |
6ba6c74d AB |
46 | return 0; |
47 | } | |
48 | ||
03802f6a AB |
49 | static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, |
50 | unsigned int len, u8 *out) | |
6ba6c74d | 51 | { |
03802f6a AB |
52 | struct sha256_ce_state *sctx = shash_desc_ctx(desc); |
53 | bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE); | |
6ba6c74d | 54 | |
03802f6a AB |
55 | ASM_EXPORT(sha256_ce_offsetof_count, |
56 | offsetof(struct sha256_ce_state, sst.count)); | |
57 | ASM_EXPORT(sha256_ce_offsetof_finalize, | |
58 | offsetof(struct sha256_ce_state, finalize)); | |
6ba6c74d AB |
59 | |
60 | /* | |
03802f6a AB |
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. | |
6ba6c74d | 63 | */ |
03802f6a | 64 | sctx->finalize = finalize; |
6ba6c74d AB |
65 | |
66 | kernel_neon_begin_partial(28); | |
03802f6a AB |
67 | sha256_base_do_update(desc, data, len, |
68 | (sha256_block_fn *)sha2_ce_transform); | |
69 | if (!finalize) | |
70 | sha256_base_do_finalize(desc, | |
71 | (sha256_block_fn *)sha2_ce_transform); | |
6ba6c74d | 72 | kernel_neon_end(); |
03802f6a | 73 | return sha256_base_finish(desc, out); |
6ba6c74d AB |
74 | } |
75 | ||
03802f6a | 76 | static int sha256_ce_final(struct shash_desc *desc, u8 *out) |
6ba6c74d | 77 | { |
ec59a65d AB |
78 | struct sha256_ce_state *sctx = shash_desc_ctx(desc); |
79 | ||
80 | sctx->finalize = 0; | |
03802f6a AB |
81 | kernel_neon_begin_partial(28); |
82 | sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); | |
83 | kernel_neon_end(); | |
84 | return sha256_base_finish(desc, out); | |
6ba6c74d AB |
85 | } |
86 | ||
87 | static struct shash_alg algs[] = { { | |
03802f6a AB |
88 | .init = sha224_base_init, |
89 | .update = sha256_ce_update, | |
90 | .final = sha256_ce_final, | |
91 | .finup = sha256_ce_finup, | |
92 | .descsize = sizeof(struct sha256_ce_state), | |
6ba6c74d | 93 | .digestsize = SHA224_DIGEST_SIZE, |
6ba6c74d AB |
94 | .base = { |
95 | .cra_name = "sha224", | |
96 | .cra_driver_name = "sha224-ce", | |
97 | .cra_priority = 200, | |
98 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
99 | .cra_blocksize = SHA256_BLOCK_SIZE, | |
100 | .cra_module = THIS_MODULE, | |
101 | } | |
102 | }, { | |
03802f6a AB |
103 | .init = sha256_base_init, |
104 | .update = sha256_ce_update, | |
105 | .final = sha256_ce_final, | |
106 | .finup = sha256_ce_finup, | |
107 | .descsize = sizeof(struct sha256_ce_state), | |
6ba6c74d | 108 | .digestsize = SHA256_DIGEST_SIZE, |
6ba6c74d AB |
109 | .base = { |
110 | .cra_name = "sha256", | |
111 | .cra_driver_name = "sha256-ce", | |
112 | .cra_priority = 200, | |
113 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
114 | .cra_blocksize = SHA256_BLOCK_SIZE, | |
115 | .cra_module = THIS_MODULE, | |
116 | } | |
117 | } }; | |
118 | ||
119 | static int __init sha2_ce_mod_init(void) | |
120 | { | |
121 | return crypto_register_shashes(algs, ARRAY_SIZE(algs)); | |
122 | } | |
123 | ||
124 | static void __exit sha2_ce_mod_fini(void) | |
125 | { | |
126 | crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); | |
127 | } | |
128 | ||
129 | module_cpu_feature_match(SHA2, sha2_ce_mod_init); | |
130 | module_exit(sha2_ce_mod_fini); |