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
24asmlinkage void sha256_block_data_order_neon(struct sha256_state *digest,
25 const u8 *data, int num_blks);
26
27static 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
43static 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
59static 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
64struct 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

source code of linux/arch/arm/crypto/sha256_neon_glue.c