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80 lines
2.0 KiB
80 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* CRC32C |
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*@Article{castagnoli-crc, |
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* author = { Guy Castagnoli and Stefan Braeuer and Martin Herrman}, |
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* title = {{Optimization of Cyclic Redundancy-Check Codes with 24 |
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* and 32 Parity Bits}}, |
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* journal = IEEE Transactions on Communication, |
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* year = {1993}, |
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* volume = {41}, |
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* number = {6}, |
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* pages = {}, |
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* month = {June}, |
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*} |
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* Used by the iSCSI driver, possibly others, and derived from |
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* the iscsi-crc.c module of the linux-iscsi driver at |
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* http://linux-iscsi.sourceforge.net. |
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* |
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* Following the example of lib/crc32, this function is intended to be |
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* flexible and useful for all users. Modules that currently have their |
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* own crc32c, but hopefully may be able to use this one are: |
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* net/sctp (please add all your doco to here if you change to |
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* use this one!) |
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* <endoflist> |
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* |
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* Copyright (c) 2004 Cisco Systems, Inc. |
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*/ |
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#include <crypto/hash.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/crc32c.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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SHASH_DESC_ON_STACK(shash, tfm); |
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u32 ret, *ctx = (u32 *)shash_desc_ctx(shash); |
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int err; |
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shash->tfm = tfm; |
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*ctx = crc; |
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err = crypto_shash_update(shash, address, length); |
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BUG_ON(err); |
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ret = *ctx; |
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barrier_data(ctx); |
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return ret; |
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} |
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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); |
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return PTR_ERR_OR_ZERO(tfm); |
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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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const char *crc32c_impl(void) |
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{ |
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return crypto_shash_driver_name(tfm); |
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} |
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EXPORT_SYMBOL(crc32c_impl); |
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module_init(libcrc32c_mod_init); |
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module_exit(libcrc32c_mod_fini); |
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MODULE_AUTHOR("Clay Haapala <[email protected]>"); |
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MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations"); |
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MODULE_LICENSE("GPL"); |
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MODULE_SOFTDEP("pre: crc32c");
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