1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions |
4 | * |
5 | * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> |
6 | */ |
7 | |
8 | #include <crypto/internal/hash.h> |
9 | #include <crypto/internal/simd.h> |
10 | #include <crypto/sha2.h> |
11 | #include <crypto/sha256_base.h> |
12 | #include <linux/cpufeature.h> |
13 | #include <linux/crypto.h> |
14 | #include <linux/module.h> |
15 | |
16 | #include <asm/hwcap.h> |
17 | #include <asm/simd.h> |
18 | #include <asm/neon.h> |
19 | #include <asm/unaligned.h> |
20 | |
21 | #include "sha256_glue.h" |
22 | |
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 | |
27 | asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src, |
28 | int blocks); |
29 | |
30 | static int sha2_ce_update(struct shash_desc *desc, const u8 *data, |
31 | unsigned int len) |
32 | { |
33 | struct sha256_state *sctx = shash_desc_ctx(desc); |
34 | |
35 | if (!crypto_simd_usable() || |
36 | (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) |
37 | return crypto_sha256_arm_update(desc, data, len); |
38 | |
39 | kernel_neon_begin(); |
40 | sha256_base_do_update(desc, data, len, |
41 | block_fn: (sha256_block_fn *)sha2_ce_transform); |
42 | kernel_neon_end(); |
43 | |
44 | return 0; |
45 | } |
46 | |
47 | static int sha2_ce_finup(struct shash_desc *desc, const u8 *data, |
48 | unsigned int len, u8 *out) |
49 | { |
50 | if (!crypto_simd_usable()) |
51 | return crypto_sha256_arm_finup(desc, data, len, hash: out); |
52 | |
53 | kernel_neon_begin(); |
54 | if (len) |
55 | sha256_base_do_update(desc, data, len, |
56 | block_fn: (sha256_block_fn *)sha2_ce_transform); |
57 | sha256_base_do_finalize(desc, block_fn: (sha256_block_fn *)sha2_ce_transform); |
58 | kernel_neon_end(); |
59 | |
60 | return sha256_base_finish(desc, out); |
61 | } |
62 | |
63 | static int sha2_ce_final(struct shash_desc *desc, u8 *out) |
64 | { |
65 | return sha2_ce_finup(desc, NULL, len: 0, out); |
66 | } |
67 | |
68 | static struct shash_alg algs[] = { { |
69 | .init = sha224_base_init, |
70 | .update = sha2_ce_update, |
71 | .final = sha2_ce_final, |
72 | .finup = sha2_ce_finup, |
73 | .descsize = sizeof(struct sha256_state), |
74 | .digestsize = SHA224_DIGEST_SIZE, |
75 | .base = { |
76 | .cra_name = "sha224" , |
77 | .cra_driver_name = "sha224-ce" , |
78 | .cra_priority = 300, |
79 | .cra_blocksize = SHA256_BLOCK_SIZE, |
80 | .cra_module = THIS_MODULE, |
81 | } |
82 | }, { |
83 | .init = sha256_base_init, |
84 | .update = sha2_ce_update, |
85 | .final = sha2_ce_final, |
86 | .finup = sha2_ce_finup, |
87 | .descsize = sizeof(struct sha256_state), |
88 | .digestsize = SHA256_DIGEST_SIZE, |
89 | .base = { |
90 | .cra_name = "sha256" , |
91 | .cra_driver_name = "sha256-ce" , |
92 | .cra_priority = 300, |
93 | .cra_blocksize = SHA256_BLOCK_SIZE, |
94 | .cra_module = THIS_MODULE, |
95 | } |
96 | } }; |
97 | |
98 | static int __init sha2_ce_mod_init(void) |
99 | { |
100 | return crypto_register_shashes(algs, ARRAY_SIZE(algs)); |
101 | } |
102 | |
103 | static void __exit sha2_ce_mod_fini(void) |
104 | { |
105 | crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); |
106 | } |
107 | |
108 | module_cpu_feature_match(SHA2, sha2_ce_mod_init); |
109 | module_exit(sha2_ce_mod_fini); |
110 | |