4 * T10 Data Integrity Field CRC16 Crypto Transform
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>
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)
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
27 #include <linux/module.h>
28 #include <linux/crc-t10dif.h>
29 #include <crypto/internal/hash.h>
30 #include <linux/init.h>
31 #include <linux/kernel.h>
33 struct chksum_desc_ctx
{
38 * Steps through buffer one byte at at time, calculates reflected
42 static int chksum_init(struct shash_desc
*desc
)
44 struct chksum_desc_ctx
*ctx
= shash_desc_ctx(desc
);
51 static int chksum_update(struct shash_desc
*desc
, const u8
*data
,
54 struct chksum_desc_ctx
*ctx
= shash_desc_ctx(desc
);
56 ctx
->crc
= crc_t10dif_generic(ctx
->crc
, data
, length
);
60 static int chksum_final(struct shash_desc
*desc
, u8
*out
)
62 struct chksum_desc_ctx
*ctx
= shash_desc_ctx(desc
);
64 *(__u16
*)out
= ctx
->crc
;
68 static int __chksum_finup(__u16
*crcp
, const u8
*data
, unsigned int len
,
71 *(__u16
*)out
= crc_t10dif_generic(*crcp
, data
, len
);
75 static int chksum_finup(struct shash_desc
*desc
, const u8
*data
,
76 unsigned int len
, u8
*out
)
78 struct chksum_desc_ctx
*ctx
= shash_desc_ctx(desc
);
80 return __chksum_finup(&ctx
->crc
, data
, len
, out
);
83 static int chksum_digest(struct shash_desc
*desc
, const u8
*data
,
84 unsigned int length
, u8
*out
)
86 struct chksum_desc_ctx
*ctx
= shash_desc_ctx(desc
);
88 return __chksum_finup(&ctx
->crc
, data
, length
, out
);
91 static struct shash_alg alg
= {
92 .digestsize
= CRC_T10DIF_DIGEST_SIZE
,
94 .update
= chksum_update
,
95 .final
= chksum_final
,
96 .finup
= chksum_finup
,
97 .digest
= chksum_digest
,
98 .descsize
= sizeof(struct chksum_desc_ctx
),
100 .cra_name
= "crct10dif",
101 .cra_driver_name
= "crct10dif-generic",
103 .cra_blocksize
= CRC_T10DIF_BLOCK_SIZE
,
104 .cra_module
= THIS_MODULE
,
108 static int __init
crct10dif_mod_init(void)
112 ret
= crypto_register_shash(&alg
);
116 static void __exit
crct10dif_mod_fini(void)
118 crypto_unregister_shash(&alg
);
121 module_init(crct10dif_mod_init
);
122 module_exit(crct10dif_mod_fini
);
124 MODULE_AUTHOR("Tim Chen <tim.c.chen@linux.intel.com>");
125 MODULE_DESCRIPTION("T10 DIF CRC calculation.");
126 MODULE_LICENSE("GPL");
127 MODULE_ALIAS_CRYPTO("crct10dif");
128 MODULE_ALIAS_CRYPTO("crct10dif-generic");
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