/* * T10 Data Integrity Field CRC16 calculation * * Copyright (c) 2007 Oracle Corporation. All rights reserved. * Written by Martin K. Petersen <martin.petersen@oracle.com> * * This source code is licensed under the GNU General Public License, * Version 2. See the file COPYING for more details. */ #include <linux/types.h> #include <linux/module.h> #include <linux/crc-t10dif.h> #include <linux/err.h> #include <linux/init.h> #include <crypto/hash.h> static struct crypto_shash *crct10dif_tfm; __u16 crc_t10dif(const unsigned char *buffer, size_t len) { struct { struct shash_desc shash; char ctx[2]; } desc; int err; desc.shash.tfm = crct10dif_tfm; desc.shash.flags = 0; *(__u16 *)desc.ctx = 0; err = crypto_shash_update(&desc.shash, buffer, len); BUG_ON(err); return *(__u16 *)desc.ctx; } EXPORT_SYMBOL(crc_t10dif); static int __init crc_t10dif_mod_init(void) { crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0); return PTR_RET(crct10dif_tfm); } static void __exit crc_t10dif_mod_fini(void) { crypto_free_shash(crct10dif_tfm); } module_init(crc_t10dif_mod_init); module_exit(crc_t10dif_mod_fini); MODULE_DESCRIPTION("T10 DIF CRC calculation"); MODULE_LICENSE("GPL");