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, 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, 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
59static int crypto_sha256_neon_final(struct shash_desc *desc, u8 *out)
60{
61	return crypto_sha256_neon_finup(desc, NULL, 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