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68411521 HX |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * T10 Data Integrity Field CRC16 Crypto Transform | |
5 | * | |
6 | * Copyright (c) 2007 Oracle Corporation. All rights reserved. | |
7 | * Written by Martin K. Petersen <martin.petersen@oracle.com> | |
8 | * Copyright (C) 2013 Intel Corporation | |
9 | * Author: Tim Chen <tim.c.chen@linux.intel.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the Free | |
13 | * Software Foundation; either version 2 of the License, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
20 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
21 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
22 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
23 | * SOFTWARE. | |
24 | * | |
25 | */ | |
26 | ||
68411521 HX |
27 | #include <linux/module.h> |
28 | #include <linux/crc-t10dif.h> | |
29 | #include <crypto/internal/hash.h> | |
30 | #include <linux/init.h> | |
68411521 HX |
31 | #include <linux/kernel.h> |
32 | ||
33 | struct chksum_desc_ctx { | |
34 | __u16 crc; | |
35 | }; | |
36 | ||
68411521 HX |
37 | /* |
38 | * Steps through buffer one byte at at time, calculates reflected | |
39 | * crc using table. | |
40 | */ | |
41 | ||
42 | static int chksum_init(struct shash_desc *desc) | |
43 | { | |
44 | struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); | |
45 | ||
46 | ctx->crc = 0; | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
51 | static int chksum_update(struct shash_desc *desc, const u8 *data, | |
52 | unsigned int length) | |
53 | { | |
54 | struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); | |
55 | ||
56 | ctx->crc = crc_t10dif_generic(ctx->crc, data, length); | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int chksum_final(struct shash_desc *desc, u8 *out) | |
61 | { | |
62 | struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); | |
63 | ||
64 | *(__u16 *)out = ctx->crc; | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len, | |
69 | u8 *out) | |
70 | { | |
71 | *(__u16 *)out = crc_t10dif_generic(*crcp, data, len); | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static int chksum_finup(struct shash_desc *desc, const u8 *data, | |
76 | unsigned int len, u8 *out) | |
77 | { | |
78 | struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); | |
79 | ||
80 | return __chksum_finup(&ctx->crc, data, len, out); | |
81 | } | |
82 | ||
83 | static int chksum_digest(struct shash_desc *desc, const u8 *data, | |
84 | unsigned int length, u8 *out) | |
85 | { | |
86 | struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); | |
87 | ||
88 | return __chksum_finup(&ctx->crc, data, length, out); | |
89 | } | |
90 | ||
91 | static struct shash_alg alg = { | |
92 | .digestsize = CRC_T10DIF_DIGEST_SIZE, | |
93 | .init = chksum_init, | |
94 | .update = chksum_update, | |
95 | .final = chksum_final, | |
96 | .finup = chksum_finup, | |
97 | .digest = chksum_digest, | |
98 | .descsize = sizeof(struct chksum_desc_ctx), | |
99 | .base = { | |
100 | .cra_name = "crct10dif", | |
101 | .cra_driver_name = "crct10dif-generic", | |
102 | .cra_priority = 100, | |
103 | .cra_blocksize = CRC_T10DIF_BLOCK_SIZE, | |
104 | .cra_module = THIS_MODULE, | |
105 | } | |
106 | }; | |
107 | ||
108 | static int __init crct10dif_mod_init(void) | |
109 | { | |
110 | int ret; | |
111 | ||
112 | ret = crypto_register_shash(&alg); | |
113 | return ret; | |
114 | } | |
115 | ||
116 | static void __exit crct10dif_mod_fini(void) | |
117 | { | |
118 | crypto_unregister_shash(&alg); | |
119 | } | |
120 | ||
121 | module_init(crct10dif_mod_init); | |
122 | module_exit(crct10dif_mod_fini); | |
123 | ||
124 | MODULE_AUTHOR("Tim Chen <tim.c.chen@linux.intel.com>"); | |
125 | MODULE_DESCRIPTION("T10 DIF CRC calculation."); | |
126 | MODULE_LICENSE("GPL"); | |
5d26a105 | 127 | MODULE_ALIAS_CRYPTO("crct10dif"); |
3e14dcf7 | 128 | MODULE_ALIAS_CRYPTO("crct10dif-generic"); |