[linux.git] / crypto / crct10dif_generic.c

/*
 * Cryptographic API.
 *
 * T10 Data Integrity Field CRC16 Crypto Transform
 *
 * Copyright (c) 2007 Oracle Corporation.  All rights reserved.
 * Written by Martin K. Petersen <[email protected]>
 * Copyright (C) 2013 Intel Corporation
 * Author: Tim Chen <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <linux/module.h>
#include <linux/crc-t10dif.h>
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/kernel.h>

struct chksum_desc_ctx {
	__u16 crc;
};

/*
 * Steps through buffer one byte at a time, calculates reflected
 * crc using table.
 */

static int chksum_init(struct shash_desc *desc)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	ctx->crc = 0;

	return 0;
}

static int chksum_update(struct shash_desc *desc, const u8 *data,
			 unsigned int length)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	ctx->crc = crc_t10dif_generic(ctx->crc, data, length);
	return 0;
}

static int chksum_final(struct shash_desc *desc, u8 *out)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	*(__u16 *)out = ctx->crc;
	return 0;
}

static int __chksum_finup(__u16 crc, const u8 *data, unsigned int len, u8 *out)
{
	*(__u16 *)out = crc_t10dif_generic(crc, data, len);
	return 0;
}

static int chksum_finup(struct shash_desc *desc, const u8 *data,
			unsigned int len, u8 *out)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	return __chksum_finup(ctx->crc, data, len, out);
}

static int chksum_digest(struct shash_desc *desc, const u8 *data,
			 unsigned int length, u8 *out)
{
	return __chksum_finup(0, data, length, out);
}

static struct shash_alg alg = {
	.digestsize		=	CRC_T10DIF_DIGEST_SIZE,
	.init		=	chksum_init,
	.update		=	chksum_update,
	.final		=	chksum_final,
	.finup		=	chksum_finup,
	.digest		=	chksum_digest,
	.descsize		=	sizeof(struct chksum_desc_ctx),
	.base			=	{
		.cra_name		=	"crct10dif",
		.cra_driver_name	=	"crct10dif-generic",
		.cra_priority		=	100,
		.cra_blocksize		=	CRC_T10DIF_BLOCK_SIZE,
		.cra_module		=	THIS_MODULE,
	}
};

static int __init crct10dif_mod_init(void)
{
	return crypto_register_shash(&alg);
}

static void __exit crct10dif_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

subsys_initcall(crct10dif_mod_init);
module_exit(crct10dif_mod_fini);

MODULE_AUTHOR("Tim Chen <[email protected]>");
MODULE_DESCRIPTION("T10 DIF CRC calculation.");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("crct10dif");
MODULE_ALIAS_CRYPTO("crct10dif-generic");
Commit	Line	Data
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 <[email protected]>
	8	* Copyright (C) 2013 Intel Corporation
	9	* Author: Tim Chen <[email protected]>
	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	37	/*
71952d78	38	* Steps through buffer one byte at a time, calculates reflected
68411521 HX	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
307508d1	68	static int __chksum_finup(__u16 crc, const u8 data, unsigned int len, u8 out)
68411521	69	{
307508d1	70	(__u16 )out = crc_t10dif_generic(crc, data, len);
68411521 HX	71	return 0;
	72	}
	73
	74	static int chksum_finup(struct shash_desc desc, const u8 data,
	75	unsigned int len, u8 *out)
	76	{
	77	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
	78
307508d1	79	return __chksum_finup(ctx->crc, data, len, out);
68411521 HX	80	}
	81
	82	static int chksum_digest(struct shash_desc desc, const u8 data,
	83	unsigned int length, u8 *out)
	84	{
307508d1	85	return __chksum_finup(0, data, length, out);
68411521 HX	86	}
	87
	88	static struct shash_alg alg = {
	89	.digestsize = CRC_T10DIF_DIGEST_SIZE,
	90	.init = chksum_init,
	91	.update = chksum_update,
	92	.final = chksum_final,
	93	.finup = chksum_finup,
	94	.digest = chksum_digest,
	95	.descsize = sizeof(struct chksum_desc_ctx),
	96	.base = {
	97	.cra_name = "crct10dif",
	98	.cra_driver_name = "crct10dif-generic",
	99	.cra_priority = 100,
	100	.cra_blocksize = CRC_T10DIF_BLOCK_SIZE,
	101	.cra_module = THIS_MODULE,
	102	}
	103	};
	104
	105	static int __init crct10dif_mod_init(void)
	106	{
36e09e1f	107	return crypto_register_shash(&alg);
68411521 HX	108	}
	109
	110	static void __exit crct10dif_mod_fini(void)
	111	{
	112	crypto_unregister_shash(&alg);
	113	}
	114
c4741b23	115	subsys_initcall(crct10dif_mod_init);
68411521 HX	116	module_exit(crct10dif_mod_fini);
	117
	118	MODULE_AUTHOR("Tim Chen <[email protected]>");
	119	MODULE_DESCRIPTION("T10 DIF CRC calculation.");
	120	MODULE_LICENSE("GPL");
5d26a105	121	MODULE_ALIAS_CRYPTO("crct10dif");
3e14dcf7	122	MODULE_ALIAS_CRYPTO("crct10dif-generic");