From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- lib/libcrc32c.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 lib/libcrc32c.c (limited to 'lib/libcrc32c.c') diff --git a/lib/libcrc32c.c b/lib/libcrc32c.c new file mode 100644 index 000000000..5ca0d815a --- /dev/null +++ b/lib/libcrc32c.c @@ -0,0 +1,80 @@ +// 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!) + * + * + * Copyright (c) 2004 Cisco Systems, Inc. + */ + +#include +#include +#include +#include +#include +#include + +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); +} + +const char *crc32c_impl(void) +{ + return crypto_shash_driver_name(tfm); +} +EXPORT_SYMBOL(crc32c_impl); + +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"); -- cgit v1.2.3