1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Glue code for the SHA256 Secure Hash Algorithm assembly implementation |
4 | * using NEON instructions. |
5 | * |
6 | * Copyright © 2015 Google Inc. |
7 | * |
8 | * This file is based on sha512_neon_glue.c: |
9 | * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi> |
10 | */ |
11 | |
12 | #include <crypto/internal/hash.h> |
13 | #include <crypto/internal/simd.h> |
14 | #include <linux/types.h> |
15 | #include <linux/string.h> |
16 | #include <crypto/sha2.h> |
17 | #include <crypto/sha256_base.h> |
18 | #include <asm/byteorder.h> |
19 | #include <asm/simd.h> |
20 | #include <asm/neon.h> |
21 | |
22 | #include "sha256_glue.h" |
23 | |
24 | asmlinkage void sha256_block_data_order_neon(struct sha256_state *digest, |
25 | const u8 *data, int num_blks); |
26 | |
27 | static int crypto_sha256_neon_update(struct shash_desc *desc, const u8 *data, |
28 | unsigned int len) |
29 | { |
30 | struct sha256_state *sctx = shash_desc_ctx(desc); |
31 | |
32 | if (!crypto_simd_usable() || |
33 | (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) |
34 | return crypto_sha256_arm_update(desc, data, len); |
35 | |
36 | kernel_neon_begin(); |
37 | sha256_base_do_update(desc, data, len, block_fn: sha256_block_data_order_neon); |
38 | kernel_neon_end(); |
39 | |
40 | return 0; |
41 | } |
42 | |
43 | static int crypto_sha256_neon_finup(struct shash_desc *desc, const u8 *data, |
44 | unsigned int len, u8 *out) |
45 | { |
46 | if (!crypto_simd_usable()) |
47 | return crypto_sha256_arm_finup(desc, data, len, hash: out); |
48 | |
49 | kernel_neon_begin(); |
50 | if (len) |
51 | sha256_base_do_update(desc, data, len, |
52 | block_fn: sha256_block_data_order_neon); |
53 | sha256_base_do_finalize(desc, block_fn: sha256_block_data_order_neon); |
54 | kernel_neon_end(); |
55 | |
56 | return sha256_base_finish(desc, out); |
57 | } |
58 | |
59 | static int crypto_sha256_neon_final(struct shash_desc *desc, u8 *out) |
60 | { |
61 | return crypto_sha256_neon_finup(desc, NULL, len: 0, out); |
62 | } |
63 | |
64 | struct shash_alg sha256_neon_algs[] = { { |
65 | .digestsize = SHA256_DIGEST_SIZE, |
66 | .init = sha256_base_init, |
67 | .update = crypto_sha256_neon_update, |
68 | .final = crypto_sha256_neon_final, |
69 | .finup = crypto_sha256_neon_finup, |
70 | .descsize = sizeof(struct sha256_state), |
71 | .base = { |
72 | .cra_name = "sha256" , |
73 | .cra_driver_name = "sha256-neon" , |
74 | .cra_priority = 250, |
75 | .cra_blocksize = SHA256_BLOCK_SIZE, |
76 | .cra_module = THIS_MODULE, |
77 | } |
78 | }, { |
79 | .digestsize = SHA224_DIGEST_SIZE, |
80 | .init = sha224_base_init, |
81 | .update = crypto_sha256_neon_update, |
82 | .final = crypto_sha256_neon_final, |
83 | .finup = crypto_sha256_neon_finup, |
84 | .descsize = sizeof(struct sha256_state), |
85 | .base = { |
86 | .cra_name = "sha224" , |
87 | .cra_driver_name = "sha224-neon" , |
88 | .cra_priority = 250, |
89 | .cra_blocksize = SHA224_BLOCK_SIZE, |
90 | .cra_module = THIS_MODULE, |
91 | } |
92 | } }; |
93 | |