2 * Cryptographic API for the 842 software compression algorithm.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * Copyright (C) IBM Corporation, 2011-2015
16 * Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
17 * Seth Jennings <sjenning@linux.vnet.ibm.com>
19 * Rewrite: Dan Streetman <ddstreet@ieee.org>
21 * This is the software implementation of compression and decompression using
22 * the 842 format. This uses the software 842 library at lib/842/ which is
23 * only a reference implementation, and is very, very slow as compared to other
24 * software compressors. You probably do not want to use this software
25 * compression. If you have access to the PowerPC 842 compression hardware, you
26 * want to use the 842 hardware compression interface, which is at:
27 * drivers/crypto/nx/nx-842-crypto.c
30 #include <linux/init.h>
31 #include <linux/module.h>
32 #include <linux/crypto.h>
33 #include <linux/sw842.h>
35 struct crypto842_ctx
{
36 char wmem
[SW842_MEM_COMPRESS
]; /* working memory for compress */
39 static int crypto842_compress(struct crypto_tfm
*tfm
,
40 const u8
*src
, unsigned int slen
,
41 u8
*dst
, unsigned int *dlen
)
43 struct crypto842_ctx
*ctx
= crypto_tfm_ctx(tfm
);
45 return sw842_compress(src
, slen
, dst
, dlen
, ctx
->wmem
);
48 static int crypto842_decompress(struct crypto_tfm
*tfm
,
49 const u8
*src
, unsigned int slen
,
50 u8
*dst
, unsigned int *dlen
)
52 return sw842_decompress(src
, slen
, dst
, dlen
);
55 static struct crypto_alg alg
= {
57 .cra_driver_name
= "842-generic",
59 .cra_flags
= CRYPTO_ALG_TYPE_COMPRESS
,
60 .cra_ctxsize
= sizeof(struct crypto842_ctx
),
61 .cra_module
= THIS_MODULE
,
62 .cra_u
= { .compress
= {
63 .coa_compress
= crypto842_compress
,
64 .coa_decompress
= crypto842_decompress
} }
67 static int __init
crypto842_mod_init(void)
69 return crypto_register_alg(&alg
);
71 module_init(crypto842_mod_init
);
73 static void __exit
crypto842_mod_exit(void)
75 crypto_unregister_alg(&alg
);
77 module_exit(crypto842_mod_exit
);
79 MODULE_LICENSE("GPL");
80 MODULE_DESCRIPTION("842 Software Compression Algorithm");
81 MODULE_ALIAS_CRYPTO("842");
82 MODULE_ALIAS_CRYPTO("842-generic");
83 MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
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