Blame view
crypto/842.c
4.17 KB
35a1fc187
|
1 |
/* |
2062c5b6d
|
2 |
* Cryptographic API for the 842 software compression algorithm. |
35a1fc187
|
3 4 5 6 7 8 9 10 11 12 13 |
* * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * |
2062c5b6d
|
14 |
* Copyright (C) IBM Corporation, 2011-2015 |
35a1fc187
|
15 |
* |
2062c5b6d
|
16 17 |
* Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com> * Seth Jennings <sjenning@linux.vnet.ibm.com> |
35a1fc187
|
18 |
* |
2062c5b6d
|
19 20 21 22 23 24 25 26 27 |
* Rewrite: Dan Streetman <ddstreet@ieee.org> * * This is the software implementation of compression and decompression using * the 842 format. This uses the software 842 library at lib/842/ which is * only a reference implementation, and is very, very slow as compared to other * software compressors. You probably do not want to use this software * compression. If you have access to the PowerPC 842 compression hardware, you * want to use the 842 hardware compression interface, which is at: * drivers/crypto/nx/nx-842-crypto.c |
35a1fc187
|
28 29 30 31 32 |
*/ #include <linux/init.h> #include <linux/module.h> #include <linux/crypto.h> |
2062c5b6d
|
33 |
#include <linux/sw842.h> |
6a8de3aef
|
34 |
#include <crypto/internal/scompress.h> |
35a1fc187
|
35 |
|
2062c5b6d
|
36 |
struct crypto842_ctx { |
6a8de3aef
|
37 |
void *wmem; /* working memory for compress */ |
35a1fc187
|
38 |
}; |
6a8de3aef
|
39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 |
static void *crypto842_alloc_ctx(struct crypto_scomp *tfm) { void *ctx; ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL); if (!ctx) return ERR_PTR(-ENOMEM); return ctx; } static int crypto842_init(struct crypto_tfm *tfm) { struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); ctx->wmem = crypto842_alloc_ctx(NULL); if (IS_ERR(ctx->wmem)) return -ENOMEM; return 0; } static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx) { kfree(ctx); } static void crypto842_exit(struct crypto_tfm *tfm) { struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); crypto842_free_ctx(NULL, ctx->wmem); } |
2062c5b6d
|
72 73 74 |
static int crypto842_compress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) |
35a1fc187
|
75 |
{ |
2062c5b6d
|
76 |
struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); |
35a1fc187
|
77 |
|
2062c5b6d
|
78 |
return sw842_compress(src, slen, dst, dlen, ctx->wmem); |
35a1fc187
|
79 |
} |
6a8de3aef
|
80 81 82 83 84 85 |
static int crypto842_scompress(struct crypto_scomp *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx) { return sw842_compress(src, slen, dst, dlen, ctx); } |
2062c5b6d
|
86 87 88 |
static int crypto842_decompress(struct crypto_tfm *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen) |
35a1fc187
|
89 |
{ |
2062c5b6d
|
90 |
return sw842_decompress(src, slen, dst, dlen); |
35a1fc187
|
91 |
} |
6a8de3aef
|
92 93 94 95 96 97 |
static int crypto842_sdecompress(struct crypto_scomp *tfm, const u8 *src, unsigned int slen, u8 *dst, unsigned int *dlen, void *ctx) { return sw842_decompress(src, slen, dst, dlen); } |
35a1fc187
|
98 99 |
static struct crypto_alg alg = { .cra_name = "842", |
2062c5b6d
|
100 101 |
.cra_driver_name = "842-generic", .cra_priority = 100, |
35a1fc187
|
102 |
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
2062c5b6d
|
103 |
.cra_ctxsize = sizeof(struct crypto842_ctx), |
35a1fc187
|
104 |
.cra_module = THIS_MODULE, |
6a8de3aef
|
105 106 |
.cra_init = crypto842_init, .cra_exit = crypto842_exit, |
35a1fc187
|
107 |
.cra_u = { .compress = { |
2062c5b6d
|
108 109 |
.coa_compress = crypto842_compress, .coa_decompress = crypto842_decompress } } |
35a1fc187
|
110 |
}; |
6a8de3aef
|
111 112 113 114 115 116 117 118 119 120 121 122 |
static struct scomp_alg scomp = { .alloc_ctx = crypto842_alloc_ctx, .free_ctx = crypto842_free_ctx, .compress = crypto842_scompress, .decompress = crypto842_sdecompress, .base = { .cra_name = "842", .cra_driver_name = "842-scomp", .cra_priority = 100, .cra_module = THIS_MODULE, } }; |
2062c5b6d
|
123 |
static int __init crypto842_mod_init(void) |
35a1fc187
|
124 |
{ |
6a8de3aef
|
125 126 127 128 129 130 131 132 133 134 135 136 137 |
int ret; ret = crypto_register_alg(&alg); if (ret) return ret; ret = crypto_register_scomp(&scomp); if (ret) { crypto_unregister_alg(&alg); return ret; } return ret; |
35a1fc187
|
138 |
} |
2062c5b6d
|
139 |
module_init(crypto842_mod_init); |
35a1fc187
|
140 |
|
2062c5b6d
|
141 |
static void __exit crypto842_mod_exit(void) |
35a1fc187
|
142 143 |
{ crypto_unregister_alg(&alg); |
6a8de3aef
|
144 |
crypto_unregister_scomp(&scomp); |
35a1fc187
|
145 |
} |
2062c5b6d
|
146 |
module_exit(crypto842_mod_exit); |
35a1fc187
|
147 148 |
MODULE_LICENSE("GPL"); |
2062c5b6d
|
149 |
MODULE_DESCRIPTION("842 Software Compression Algorithm"); |
5d26a105b
|
150 |
MODULE_ALIAS_CRYPTO("842"); |
2062c5b6d
|
151 152 |
MODULE_ALIAS_CRYPTO("842-generic"); MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>"); |