cregit-Linux how code gets into the kernel

Release 4.9 lib/libcrc32c.c

Directory: lib
 * CRC32C
 * 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
 * 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.

#include <crypto/hash.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/crc32c.h>

static struct crypto_shash *tfm;

u32 crc32c(u32 crc, const void *address, unsigned int length) { SHASH_DESC_ON_STACK(shash, tfm); u32 *ctx = (u32 *)shash_desc_ctx(shash); int err; shash->tfm = tfm; shash->flags = 0; *ctx = crc; err = crypto_shash_update(shash, address, length); BUG_ON(err); return *ctx; }


herbert xuherbert xu4051.95%133.33%
clay haapalaclay haapala2025.97%133.33%
jan-simon mollerjan-simon moller1722.08%133.33%

static int __init libcrc32c_mod_init(void) { tfm = crypto_alloc_shash("crc32c", 0, 0); return PTR_ERR_OR_ZERO(tfm); }


herbert xuherbert xu1869.23%133.33%
clay haapalaclay haapala726.92%133.33%
fabian frederickfabian frederick13.85%133.33%

static void __exit libcrc32c_mod_fini(void) { crypto_free_shash(tfm); }


herbert xuherbert xu964.29%150.00%
clay haapalaclay haapala535.71%150.00%

module_init(libcrc32c_mod_init); module_exit(libcrc32c_mod_fini); MODULE_AUTHOR("Clay Haapala <>"); MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations"); MODULE_LICENSE("GPL"); MODULE_SOFTDEP("pre: crc32c");

Overall Contributors

herbert xuherbert xu10659.89%114.29%
clay haapalaclay haapala4022.60%114.29%
jan-simon mollerjan-simon moller179.60%114.29%
jean delvarejean delvare84.52%228.57%
adrian-ken rueegseggeradrian-ken rueegsegger52.82%114.29%
fabian frederickfabian frederick10.56%114.29%
Directory: lib