1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
4 *
5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
6 */
7
8#include <crypto/internal/hash.h>
9#include <crypto/internal/simd.h>
10#include <crypto/sha.h>
11#include <crypto/sha1_base.h>
12#include <linux/cpufeature.h>
13#include <linux/crypto.h>
14#include <linux/module.h>
15
16#include <asm/hwcap.h>
17#include <asm/neon.h>
18#include <asm/simd.h>
19
20#include "sha1.h"
21
22MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
23MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
24MODULE_LICENSE("GPL v2");
25
26asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
27				  int blocks);
28
29static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
30			  unsigned int len)
31{
32	struct sha1_state *sctx = shash_desc_ctx(desc);
33
34	if (!crypto_simd_usable() ||
35	    (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
36		return sha1_update_arm(desc, data, len);
37
38	kernel_neon_begin();
39	sha1_base_do_update(desc, data, len, sha1_ce_transform);
40	kernel_neon_end();
41
42	return 0;
43}
44
45static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
46			 unsigned int len, u8 *out)
47{
48	if (!crypto_simd_usable())
49		return sha1_finup_arm(desc, data, len, out);
50
51	kernel_neon_begin();
52	if (len)
53		sha1_base_do_update(desc, data, len, sha1_ce_transform);
54	sha1_base_do_finalize(desc, sha1_ce_transform);
55	kernel_neon_end();
56
57	return sha1_base_finish(desc, out);
58}
59
60static int sha1_ce_final(struct shash_desc *desc, u8 *out)
61{
62	return sha1_ce_finup(desc, NULL, 0, out);
63}
64
65static struct shash_alg alg = {
66	.init			= sha1_base_init,
67	.update			= sha1_ce_update,
68	.final			= sha1_ce_final,
69	.finup			= sha1_ce_finup,
70	.descsize		= sizeof(struct sha1_state),
71	.digestsize		= SHA1_DIGEST_SIZE,
72	.base			= {
73		.cra_name		= "sha1",
74		.cra_driver_name	= "sha1-ce",
75		.cra_priority		= 200,
76		.cra_blocksize		= SHA1_BLOCK_SIZE,
77		.cra_module		= THIS_MODULE,
78	}
79};
80
81static int __init sha1_ce_mod_init(void)
82{
83	return crypto_register_shash(&alg);
84}
85
86static void __exit sha1_ce_mod_fini(void)
87{
88	crypto_unregister_shash(&alg);
89}
90
91module_cpu_feature_match(SHA1, sha1_ce_mod_init);
92module_exit(sha1_ce_mod_fini);
93