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lib/libcrc32c.c
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/* * CRC32C *@Article{castagnoli-crc, * author = { Guy Castagnoli and Stefan Braeuer and Martin Herrman}, * title = {{Optimization of Cyclic Redundancy-Check Codes with 24 * and 32 Parity Bits}}, * journal = IEEE Transactions on Communication, * year = {1993}, * volume = {41}, * number = {6}, * pages = {}, * month = {June}, *} * Used by the iSCSI driver, possibly others, and derived from the * the iscsi-crc.c module of the linux-iscsi driver at * http://linux-iscsi.sourceforge.net. * * Following the example of lib/crc32, this function is intended to be * flexible and useful for all users. Modules that currently have their * own crc32c, but hopefully may be able to use this one are: * net/sctp (please add all your doco to here if you change to * use this one!) * <endoflist> * * Copyright (c) 2004 Cisco Systems, Inc. * * 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. * */ |
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#include <crypto/hash.h> #include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> |
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static struct crypto_shash *tfm; |
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u32 crc32c(u32 crc, const void *address, unsigned int length) |
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{ |
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struct { struct shash_desc shash; char ctx[crypto_shash_descsize(tfm)]; } desc; int err; |
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desc.shash.tfm = tfm; desc.shash.flags = 0; *(u32 *)desc.ctx = crc; |
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err = crypto_shash_update(&desc.shash, address, length); BUG_ON(err); |
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return *(u32 *)desc.ctx; } |
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EXPORT_SYMBOL(crc32c); |
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static int __init libcrc32c_mod_init(void) |
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{ |
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tfm = crypto_alloc_shash("crc32c", 0, 0); if (IS_ERR(tfm)) return PTR_ERR(tfm); |
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return 0; |
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} |
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static void __exit libcrc32c_mod_fini(void) |
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{ |
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crypto_free_shash(tfm); |
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} |
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module_init(libcrc32c_mod_init); module_exit(libcrc32c_mod_fini); MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>"); MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations"); MODULE_LICENSE("GPL"); |