ia64/linux-2.6.18-xen.hg

view crypto/crypto_null.c @ 854:950b9eb27661

usbback: fix urb interval value for interrupt urbs.

Signed-off-by: Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Apr 06 13:51:20 2009 +0100 (2009-04-06)
parents 831230e53067
children
line source
1 /*
2 * Cryptographic API.
3 *
4 * Null algorithms, aka Much Ado About Nothing.
5 *
6 * These are needed for IPsec, and may be useful in general for
7 * testing & debugging.
8 *
9 * The null cipher is compliant with RFC2410.
10 *
11 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 */
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/mm.h>
22 #include <asm/scatterlist.h>
23 #include <linux/crypto.h>
24 #include <linux/string.h>
26 #define NULL_KEY_SIZE 0
27 #define NULL_BLOCK_SIZE 1
28 #define NULL_DIGEST_SIZE 0
30 static int null_compress(struct crypto_tfm *tfm, const u8 *src,
31 unsigned int slen, u8 *dst, unsigned int *dlen)
32 {
33 if (slen > *dlen)
34 return -EINVAL;
35 memcpy(dst, src, slen);
36 *dlen = slen;
37 return 0;
38 }
40 static void null_init(struct crypto_tfm *tfm)
41 { }
43 static void null_update(struct crypto_tfm *tfm, const u8 *data,
44 unsigned int len)
45 { }
47 static void null_final(struct crypto_tfm *tfm, u8 *out)
48 { }
50 static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
51 unsigned int keylen, u32 *flags)
52 { return 0; }
54 static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
55 {
56 memcpy(dst, src, NULL_BLOCK_SIZE);
57 }
59 static struct crypto_alg compress_null = {
60 .cra_name = "compress_null",
61 .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
62 .cra_blocksize = NULL_BLOCK_SIZE,
63 .cra_ctxsize = 0,
64 .cra_module = THIS_MODULE,
65 .cra_list = LIST_HEAD_INIT(compress_null.cra_list),
66 .cra_u = { .compress = {
67 .coa_compress = null_compress,
68 .coa_decompress = null_compress } }
69 };
71 static struct crypto_alg digest_null = {
72 .cra_name = "digest_null",
73 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
74 .cra_blocksize = NULL_BLOCK_SIZE,
75 .cra_ctxsize = 0,
76 .cra_module = THIS_MODULE,
77 .cra_list = LIST_HEAD_INIT(digest_null.cra_list),
78 .cra_u = { .digest = {
79 .dia_digestsize = NULL_DIGEST_SIZE,
80 .dia_init = null_init,
81 .dia_update = null_update,
82 .dia_final = null_final } }
83 };
85 static struct crypto_alg cipher_null = {
86 .cra_name = "cipher_null",
87 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
88 .cra_blocksize = NULL_BLOCK_SIZE,
89 .cra_ctxsize = 0,
90 .cra_module = THIS_MODULE,
91 .cra_list = LIST_HEAD_INIT(cipher_null.cra_list),
92 .cra_u = { .cipher = {
93 .cia_min_keysize = NULL_KEY_SIZE,
94 .cia_max_keysize = NULL_KEY_SIZE,
95 .cia_setkey = null_setkey,
96 .cia_encrypt = null_crypt,
97 .cia_decrypt = null_crypt } }
98 };
100 MODULE_ALIAS("compress_null");
101 MODULE_ALIAS("digest_null");
102 MODULE_ALIAS("cipher_null");
104 static int __init init(void)
105 {
106 int ret = 0;
108 ret = crypto_register_alg(&cipher_null);
109 if (ret < 0)
110 goto out;
112 ret = crypto_register_alg(&digest_null);
113 if (ret < 0) {
114 crypto_unregister_alg(&cipher_null);
115 goto out;
116 }
118 ret = crypto_register_alg(&compress_null);
119 if (ret < 0) {
120 crypto_unregister_alg(&digest_null);
121 crypto_unregister_alg(&cipher_null);
122 goto out;
123 }
125 out:
126 return ret;
127 }
129 static void __exit fini(void)
130 {
131 crypto_unregister_alg(&compress_null);
132 crypto_unregister_alg(&digest_null);
133 crypto_unregister_alg(&cipher_null);
134 }
136 module_init(init);
137 module_exit(fini);
139 MODULE_LICENSE("GPL");
140 MODULE_DESCRIPTION("Null Cryptographic Algorithms");