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/cpufeature.h>
15 #include <linux/crypto.h>
16 #include <linux/module.h>
17
18 #include <asm/hwcap.h>
19 #include <asm/neon.h>
20 #include <asm/simd.h>
21
22 #include "sha1.h"
23
24 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
25 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
26 MODULE_LICENSE("GPL v2");
27
28 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
29 int blocks);
30
sha1_ce_update(struct shash_desc * desc,const u8 * data,unsigned int len)31 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
32 unsigned int len)
33 {
34 struct sha1_state *sctx = shash_desc_ctx(desc);
35
36 if (!may_use_simd() ||
37 (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
38 return sha1_update_arm(desc, data, len);
39
40 kernel_neon_begin();
41 sha1_base_do_update(desc, data, len, sha1_ce_transform);
42 kernel_neon_end();
43
44 return 0;
45 }
46
sha1_ce_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)47 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
48 unsigned int len, u8 *out)
49 {
50 if (!may_use_simd())
51 return sha1_finup_arm(desc, data, len, out);
52
53 kernel_neon_begin();
54 if (len)
55 sha1_base_do_update(desc, data, len, sha1_ce_transform);
56 sha1_base_do_finalize(desc, sha1_ce_transform);
57 kernel_neon_end();
58
59 return sha1_base_finish(desc, out);
60 }
61
sha1_ce_final(struct shash_desc * desc,u8 * out)62 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
63 {
64 return sha1_ce_finup(desc, NULL, 0, out);
65 }
66
67 static struct shash_alg alg = {
68 .init = sha1_base_init,
69 .update = sha1_ce_update,
70 .final = sha1_ce_final,
71 .finup = sha1_ce_finup,
72 .descsize = sizeof(struct sha1_state),
73 .digestsize = SHA1_DIGEST_SIZE,
74 .base = {
75 .cra_name = "sha1",
76 .cra_driver_name = "sha1-ce",
77 .cra_priority = 200,
78 .cra_blocksize = SHA1_BLOCK_SIZE,
79 .cra_module = THIS_MODULE,
80 }
81 };
82
sha1_ce_mod_init(void)83 static int __init sha1_ce_mod_init(void)
84 {
85 return crypto_register_shash(&alg);
86 }
87
sha1_ce_mod_fini(void)88 static void __exit sha1_ce_mod_fini(void)
89 {
90 crypto_unregister_shash(&alg);
91 }
92
93 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
94 module_exit(sha1_ce_mod_fini);
95
