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TOMOYO Linux Cross Reference
Linux/lib/libcrc32c.c

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  1 /* 
  2  * CRC32C
  3  *@Article{castagnoli-crc,
  4  * author =       { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
  5  * title =        {{Optimization of Cyclic Redundancy-Check Codes with 24
  6  *                 and 32 Parity Bits}},
  7  * journal =      IEEE Transactions on Communication,
  8  * year =         {1993},
  9  * volume =       {41},
 10  * number =       {6},
 11  * pages =        {},
 12  * month =        {June},
 13  *}
 14  * Used by the iSCSI driver, possibly others, and derived from the
 15  * the iscsi-crc.c module of the linux-iscsi driver at
 16  * http://linux-iscsi.sourceforge.net.
 17  *
 18  * Following the example of lib/crc32, this function is intended to be
 19  * flexible and useful for all users.  Modules that currently have their
 20  * own crc32c, but hopefully may be able to use this one are:
 21  *  net/sctp (please add all your doco to here if you change to
 22  *            use this one!)
 23  *  <endoflist>
 24  *
 25  * Copyright (c) 2004 Cisco Systems, Inc.
 26  * 
 27  * This program is free software; you can redistribute it and/or modify it
 28  * under the terms of the GNU General Public License as published by the Free
 29  * Software Foundation; either version 2 of the License, or (at your option) 
 30  * any later version.
 31  *
 32  */
 33 
 34 #include <crypto/hash.h>
 35 #include <linux/err.h>
 36 #include <linux/init.h>
 37 #include <linux/kernel.h>
 38 #include <linux/module.h>
 39 
 40 static struct crypto_shash *tfm;
 41 
 42 u32 crc32c(u32 crc, const void *address, unsigned int length)
 43 {
 44         struct {
 45                 struct shash_desc shash;
 46                 char ctx[crypto_shash_descsize(tfm)];
 47         } desc;
 48         int err;
 49 
 50         desc.shash.tfm = tfm;
 51         desc.shash.flags = 0;
 52         *(u32 *)desc.ctx = crc;
 53 
 54         err = crypto_shash_update(&desc.shash, address, length);
 55         BUG_ON(err);
 56 
 57         return *(u32 *)desc.ctx;
 58 }
 59 
 60 EXPORT_SYMBOL(crc32c);
 61 
 62 static int __init libcrc32c_mod_init(void)
 63 {
 64         tfm = crypto_alloc_shash("crc32c", 0, 0);
 65         if (IS_ERR(tfm))
 66                 return PTR_ERR(tfm);
 67 
 68         return 0;
 69 }
 70 
 71 static void __exit libcrc32c_mod_fini(void)
 72 {
 73         crypto_free_shash(tfm);
 74 }
 75 
 76 module_init(libcrc32c_mod_init);
 77 module_exit(libcrc32c_mod_fini);
 78 
 79 MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
 80 MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations");
 81 MODULE_LICENSE("GPL");
 82 

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