diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /lib/libcrc32c.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | lib/libcrc32c.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/lib/libcrc32c.c b/lib/libcrc32c.c new file mode 100644 index 0000000000..649e687413 --- /dev/null +++ b/lib/libcrc32c.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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 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. + */ + +#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 ret, *ctx = (u32 *)shash_desc_ctx(shash); + int err; + + shash->tfm = tfm; + *ctx = crc; + + err = crypto_shash_update(shash, address, length); + BUG_ON(err); + + ret = *ctx; + barrier_data(ctx); + return ret; +} + +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"); +MODULE_SOFTDEP("pre: crc32c"); |