tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * sha2-ce-glue.c - SHA-224/SHA-256 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/internal/simd.h>
13#include <crypto/sha.h>
14#include <crypto/sha256_base.h>
15#include <linux/cpufeature.h>
16#include <linux/crypto.h>
17#include <linux/module.h>
18
19#include <asm/hwcap.h>
20#include <asm/simd.h>
21#include <asm/neon.h>
22#include <asm/unaligned.h>
23
24#include "sha256_glue.h"
25
26MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
27MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
28MODULE_LICENSE("GPL v2");
29
30asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
31 int blocks);
32
33static int sha2_ce_update(struct shash_desc *desc, const u8 *data,
34 unsigned int len)
35{
36 struct sha256_state *sctx = shash_desc_ctx(desc);
37
38 if (!crypto_simd_usable() ||
39 (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
40 return crypto_sha256_arm_update(desc, data, len);
41
42 kernel_neon_begin();
43 sha256_base_do_update(desc, data, len,
44 (sha256_block_fn *)sha2_ce_transform);
45 kernel_neon_end();
46
47 return 0;
48}
49
50static int sha2_ce_finup(struct shash_desc *desc, const u8 *data,
51 unsigned int len, u8 *out)
52{
53 if (!crypto_simd_usable())
54 return crypto_sha256_arm_finup(desc, data, len, out);
55
56 kernel_neon_begin();
57 if (len)
58 sha256_base_do_update(desc, data, len,
59 (sha256_block_fn *)sha2_ce_transform);
60 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
61 kernel_neon_end();
62
63 return sha256_base_finish(desc, out);
64}
65
66static int sha2_ce_final(struct shash_desc *desc, u8 *out)
67{
68 return sha2_ce_finup(desc, NULL, 0, out);
69}
70
71static struct shash_alg algs[] = { {
72 .init = sha224_base_init,
73 .update = sha2_ce_update,
74 .final = sha2_ce_final,
75 .finup = sha2_ce_finup,
76 .descsize = sizeof(struct sha256_state),
77 .digestsize = SHA224_DIGEST_SIZE,
78 .base = {
79 .cra_name = "sha224",
80 .cra_driver_name = "sha224-ce",
81 .cra_priority = 300,
82 .cra_blocksize = SHA256_BLOCK_SIZE,
83 .cra_module = THIS_MODULE,
84 }
85}, {
86 .init = sha256_base_init,
87 .update = sha2_ce_update,
88 .final = sha2_ce_final,
89 .finup = sha2_ce_finup,
90 .descsize = sizeof(struct sha256_state),
91 .digestsize = SHA256_DIGEST_SIZE,
92 .base = {
93 .cra_name = "sha256",
94 .cra_driver_name = "sha256-ce",
95 .cra_priority = 300,
96 .cra_blocksize = SHA256_BLOCK_SIZE,
97 .cra_module = THIS_MODULE,
98 }
99} };
100
101static int __init sha2_ce_mod_init(void)
102{
103 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
104}
105
106static void __exit sha2_ce_mod_fini(void)
107{
108 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
109}
110
111module_cpu_feature_match(SHA2, sha2_ce_mod_init);
112module_exit(sha2_ce_mod_fini);