forked from luck/tmp_suning_uos_patched
f8eaf298c8
replace IS_ERR/PTR_ERR Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <crypto/hash.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
static struct crypto_shash *tfm;
|
|
|
|
u32 crc32c(u32 crc, const void *address, unsigned int length)
|
|
{
|
|
struct {
|
|
struct shash_desc shash;
|
|
char ctx[crypto_shash_descsize(tfm)];
|
|
} desc;
|
|
int err;
|
|
|
|
desc.shash.tfm = tfm;
|
|
desc.shash.flags = 0;
|
|
*(u32 *)desc.ctx = crc;
|
|
|
|
err = crypto_shash_update(&desc.shash, address, length);
|
|
BUG_ON(err);
|
|
|
|
return *(u32 *)desc.ctx;
|
|
}
|
|
|
|
EXPORT_SYMBOL(crc32c);
|
|
|
|
static int __init libcrc32c_mod_init(void)
|
|
{
|
|
tfm = crypto_alloc_shash("crc32c", 0, 0);
|
|
return PTR_ERR_OR_ZERO(tfm);
|
|
}
|
|
|
|
static void __exit libcrc32c_mod_fini(void)
|
|
{
|
|
crypto_free_shash(tfm);
|
|
}
|
|
|
|
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");
|