cregit-Linux how code gets into the kernel

Release 4.7 crypto/crct10dif_generic.c

Directory: crypto
/*
 * Cryptographic API.
 *
 * T10 Data Integrity Field CRC16 Crypto Transform
 *
 * Copyright (c) 2007 Oracle Corporation.  All rights reserved.
 * Written by Martin K. Petersen <martin.petersen@oracle.com>
 * Copyright (C) 2013 Intel Corporation
 * Author: Tim Chen <tim.c.chen@linux.intel.com>
 *
 * 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 at 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; }

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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; }

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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; }

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

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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); }

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static int chksum_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out) { struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); return __chksum_finup(&ctx->crc, data, length, out); }

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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) { int ret; ret = crypto_register_shash(&alg); return ret; }

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

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module_init(crct10dif_mod_init); module_exit(crct10dif_mod_fini); MODULE_AUTHOR("Tim Chen <tim.c.chen@linux.intel.com>"); MODULE_DESCRIPTION("T10 DIF CRC calculation."); MODULE_LICENSE("GPL"); MODULE_ALIAS_CRYPTO("crct10dif"); MODULE_ALIAS_CRYPTO("crct10dif-generic");

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Directory: crypto
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