1 /*
2 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
3 *
4 * Copyright (C) 2014 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 <asm/neon.h>
12 #include <asm/unaligned.h>
13 #include <crypto/internal/hash.h>
14 #include <crypto/sha.h>
15 #include <crypto/sha1_base.h>
16 #include <linux/cpufeature.h>
17 #include <linux/crypto.h>
18 #include <linux/module.h>
19
20 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
21 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
22 MODULE_LICENSE("GPL v2");
23
24 struct sha1_ce_state {
25 struct sha1_state sst;
26 u32 finalize;
27 };
28
29 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
30 int blocks);
31
32 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
33 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
34
sha1_ce_update(struct shash_desc * desc,const u8 * data,unsigned int len)35 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
36 unsigned int len)
37 {
38 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
39
40 sctx->finalize = 0;
41 kernel_neon_begin_partial(16);
42 sha1_base_do_update(desc, data, len,
43 (sha1_block_fn *)sha1_ce_transform);
44 kernel_neon_end();
45
46 return 0;
47 }
48
sha1_ce_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)49 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
50 unsigned int len, u8 *out)
51 {
52 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
53 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
54
55 /*
56 * Allow the asm code to perform the finalization if there is no
57 * partial data and the input is a round multiple of the block size.
58 */
59 sctx->finalize = finalize;
60
61 kernel_neon_begin_partial(16);
62 sha1_base_do_update(desc, data, len,
63 (sha1_block_fn *)sha1_ce_transform);
64 if (!finalize)
65 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
66 kernel_neon_end();
67 return sha1_base_finish(desc, out);
68 }
69
sha1_ce_final(struct shash_desc * desc,u8 * out)70 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
71 {
72 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
73
74 sctx->finalize = 0;
75 kernel_neon_begin_partial(16);
76 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
77 kernel_neon_end();
78 return sha1_base_finish(desc, out);
79 }
80
81 static struct shash_alg alg = {
82 .init = sha1_base_init,
83 .update = sha1_ce_update,
84 .final = sha1_ce_final,
85 .finup = sha1_ce_finup,
86 .descsize = sizeof(struct sha1_ce_state),
87 .digestsize = SHA1_DIGEST_SIZE,
88 .base = {
89 .cra_name = "sha1",
90 .cra_driver_name = "sha1-ce",
91 .cra_priority = 200,
92 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
93 .cra_blocksize = SHA1_BLOCK_SIZE,
94 .cra_module = THIS_MODULE,
95 }
96 };
97
sha1_ce_mod_init(void)98 static int __init sha1_ce_mod_init(void)
99 {
100 return crypto_register_shash(&alg);
101 }
102
sha1_ce_mod_fini(void)103 static void __exit sha1_ce_mod_fini(void)
104 {
105 crypto_unregister_shash(&alg);
106 }
107
108 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
109 module_exit(sha1_ce_mod_fini);
110