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, 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, out);
48
49 kernel_neon_begin();
50 if (len)
51 sha256_base_do_update(desc, data, len,
52 sha256_block_data_order_neon);
53 sha256_base_do_finalize(desc, 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, 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
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