1/*
2 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
3 *
4 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <crypto/internal/hash.h>
12#include <crypto/sha.h>
13#include <crypto/sha1_base.h>
14#include <linux/crypto.h>
15#include <linux/module.h>
16
17#include <asm/hwcap.h>
18#include <asm/neon.h>
19#include <asm/simd.h>
20
21#include "sha1.h"
22
23MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
24MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25MODULE_LICENSE("GPL v2");
26
27asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
28				  int blocks);
29
30static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
31			  unsigned int len)
32{
33	struct sha1_state *sctx = shash_desc_ctx(desc);
34
35	if (!may_use_simd() ||
36	    (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
37		return sha1_update_arm(desc, data, len);
38
39	kernel_neon_begin();
40	sha1_base_do_update(desc, data, len, sha1_ce_transform);
41	kernel_neon_end();
42
43	return 0;
44}
45
46static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
47			 unsigned int len, u8 *out)
48{
49	if (!may_use_simd())
50		return sha1_finup_arm(desc, data, len, out);
51
52	kernel_neon_begin();
53	if (len)
54		sha1_base_do_update(desc, data, len, sha1_ce_transform);
55	sha1_base_do_finalize(desc, sha1_ce_transform);
56	kernel_neon_end();
57
58	return sha1_base_finish(desc, out);
59}
60
61static int sha1_ce_final(struct shash_desc *desc, u8 *out)
62{
63	return sha1_ce_finup(desc, NULL, 0, out);
64}
65
66static struct shash_alg alg = {
67	.init			= sha1_base_init,
68	.update			= sha1_ce_update,
69	.final			= sha1_ce_final,
70	.finup			= sha1_ce_finup,
71	.descsize		= sizeof(struct sha1_state),
72	.digestsize		= SHA1_DIGEST_SIZE,
73	.base			= {
74		.cra_name		= "sha1",
75		.cra_driver_name	= "sha1-ce",
76		.cra_priority		= 200,
77		.cra_flags		= CRYPTO_ALG_TYPE_SHASH,
78		.cra_blocksize		= SHA1_BLOCK_SIZE,
79		.cra_module		= THIS_MODULE,
80	}
81};
82
83static int __init sha1_ce_mod_init(void)
84{
85	if (!(elf_hwcap2 & HWCAP2_SHA1))
86		return -ENODEV;
87	return crypto_register_shash(&alg);
88}
89
90static void __exit sha1_ce_mod_fini(void)
91{
92	crypto_unregister_shash(&alg);
93}
94
95module_init(sha1_ce_mod_init);
96module_exit(sha1_ce_mod_fini);
97