1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
4 * ARM NEON instructions.
5 *
6 * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
7 *
8 * This file is based on sha1_generic.c and sha1_ssse3_glue.c:
9 *  Copyright (c) Alan Smithee.
10 *  Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
11 *  Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
12 *  Copyright (c) Mathias Krause <minipli@googlemail.com>
13 *  Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
14 */
15
16#include <crypto/internal/hash.h>
17#include <crypto/internal/simd.h>
18#include <linux/init.h>
19#include <linux/module.h>
20#include <linux/mm.h>
21#include <linux/types.h>
22#include <crypto/sha.h>
23#include <crypto/sha1_base.h>
24#include <asm/neon.h>
25#include <asm/simd.h>
26
27#include "sha1.h"
28
29asmlinkage void sha1_transform_neon(void *state_h, const char *data,
30				    unsigned int rounds);
31
32static int sha1_neon_update(struct shash_desc *desc, const u8 *data,
33			  unsigned int len)
34{
35	struct sha1_state *sctx = shash_desc_ctx(desc);
36
37	if (!crypto_simd_usable() ||
38	    (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
39		return sha1_update_arm(desc, data, len);
40
41	kernel_neon_begin();
42	sha1_base_do_update(desc, data, len,
43			    (sha1_block_fn *)sha1_transform_neon);
44	kernel_neon_end();
45
46	return 0;
47}
48
49static int sha1_neon_finup(struct shash_desc *desc, const u8 *data,
50			   unsigned int len, u8 *out)
51{
52	if (!crypto_simd_usable())
53		return sha1_finup_arm(desc, data, len, out);
54
55	kernel_neon_begin();
56	if (len)
57		sha1_base_do_update(desc, data, len,
58				    (sha1_block_fn *)sha1_transform_neon);
59	sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_neon);
60	kernel_neon_end();
61
62	return sha1_base_finish(desc, out);
63}
64
65static int sha1_neon_final(struct shash_desc *desc, u8 *out)
66{
67	return sha1_neon_finup(desc, NULL, 0, out);
68}
69
70static struct shash_alg alg = {
71	.digestsize	=	SHA1_DIGEST_SIZE,
72	.init		=	sha1_base_init,
73	.update		=	sha1_neon_update,
74	.final		=	sha1_neon_final,
75	.finup		=	sha1_neon_finup,
76	.descsize	=	sizeof(struct sha1_state),
77	.base		=	{
78		.cra_name		= "sha1",
79		.cra_driver_name	= "sha1-neon",
80		.cra_priority		= 250,
81		.cra_blocksize		= SHA1_BLOCK_SIZE,
82		.cra_module		= THIS_MODULE,
83	}
84};
85
86static int __init sha1_neon_mod_init(void)
87{
88	if (!cpu_has_neon())
89		return -ENODEV;
90
91	return crypto_register_shash(&alg);
92}
93
94static void __exit sha1_neon_mod_fini(void)
95{
96	crypto_unregister_shash(&alg);
97}
98
99module_init(sha1_neon_mod_init);
100module_exit(sha1_neon_mod_fini);
101
102MODULE_LICENSE("GPL");
103MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
104MODULE_ALIAS_CRYPTO("sha1");
105