Root/
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 | |
20 | #include <crypto/null.h> |
21 | #include <crypto/internal/hash.h> |
22 | #include <crypto/internal/skcipher.h> |
23 | #include <linux/init.h> |
24 | #include <linux/module.h> |
25 | #include <linux/mm.h> |
26 | #include <linux/string.h> |
27 | |
28 | static int null_compress(struct crypto_tfm *tfm, const u8 *src, |
29 | unsigned int slen, u8 *dst, unsigned int *dlen) |
30 | { |
31 | if (slen > *dlen) |
32 | return -EINVAL; |
33 | memcpy(dst, src, slen); |
34 | *dlen = slen; |
35 | return 0; |
36 | } |
37 | |
38 | static int null_init(struct shash_desc *desc) |
39 | { |
40 | return 0; |
41 | } |
42 | |
43 | static int null_update(struct shash_desc *desc, const u8 *data, |
44 | unsigned int len) |
45 | { |
46 | return 0; |
47 | } |
48 | |
49 | static int null_final(struct shash_desc *desc, u8 *out) |
50 | { |
51 | return 0; |
52 | } |
53 | |
54 | static int null_digest(struct shash_desc *desc, const u8 *data, |
55 | unsigned int len, u8 *out) |
56 | { |
57 | return 0; |
58 | } |
59 | |
60 | static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key, |
61 | unsigned int keylen) |
62 | { return 0; } |
63 | |
64 | static int null_setkey(struct crypto_tfm *tfm, const u8 *key, |
65 | unsigned int keylen) |
66 | { return 0; } |
67 | |
68 | static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
69 | { |
70 | memcpy(dst, src, NULL_BLOCK_SIZE); |
71 | } |
72 | |
73 | static int skcipher_null_crypt(struct blkcipher_desc *desc, |
74 | struct scatterlist *dst, |
75 | struct scatterlist *src, unsigned int nbytes) |
76 | { |
77 | struct blkcipher_walk walk; |
78 | int err; |
79 | |
80 | blkcipher_walk_init(&walk, dst, src, nbytes); |
81 | err = blkcipher_walk_virt(desc, &walk); |
82 | |
83 | while (walk.nbytes) { |
84 | if (walk.src.virt.addr != walk.dst.virt.addr) |
85 | memcpy(walk.dst.virt.addr, walk.src.virt.addr, |
86 | walk.nbytes); |
87 | err = blkcipher_walk_done(desc, &walk, 0); |
88 | } |
89 | |
90 | return err; |
91 | } |
92 | |
93 | static struct shash_alg digest_null = { |
94 | .digestsize = NULL_DIGEST_SIZE, |
95 | .setkey = null_hash_setkey, |
96 | .init = null_init, |
97 | .update = null_update, |
98 | .finup = null_digest, |
99 | .digest = null_digest, |
100 | .final = null_final, |
101 | .base = { |
102 | .cra_name = "digest_null", |
103 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
104 | .cra_blocksize = NULL_BLOCK_SIZE, |
105 | .cra_module = THIS_MODULE, |
106 | } |
107 | }; |
108 | |
109 | static struct crypto_alg null_algs[3] = { { |
110 | .cra_name = "cipher_null", |
111 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
112 | .cra_blocksize = NULL_BLOCK_SIZE, |
113 | .cra_ctxsize = 0, |
114 | .cra_module = THIS_MODULE, |
115 | .cra_u = { .cipher = { |
116 | .cia_min_keysize = NULL_KEY_SIZE, |
117 | .cia_max_keysize = NULL_KEY_SIZE, |
118 | .cia_setkey = null_setkey, |
119 | .cia_encrypt = null_crypt, |
120 | .cia_decrypt = null_crypt } } |
121 | }, { |
122 | .cra_name = "ecb(cipher_null)", |
123 | .cra_driver_name = "ecb-cipher_null", |
124 | .cra_priority = 100, |
125 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, |
126 | .cra_blocksize = NULL_BLOCK_SIZE, |
127 | .cra_type = &crypto_blkcipher_type, |
128 | .cra_ctxsize = 0, |
129 | .cra_module = THIS_MODULE, |
130 | .cra_u = { .blkcipher = { |
131 | .min_keysize = NULL_KEY_SIZE, |
132 | .max_keysize = NULL_KEY_SIZE, |
133 | .ivsize = NULL_IV_SIZE, |
134 | .setkey = null_setkey, |
135 | .encrypt = skcipher_null_crypt, |
136 | .decrypt = skcipher_null_crypt } } |
137 | }, { |
138 | .cra_name = "compress_null", |
139 | .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
140 | .cra_blocksize = NULL_BLOCK_SIZE, |
141 | .cra_ctxsize = 0, |
142 | .cra_module = THIS_MODULE, |
143 | .cra_u = { .compress = { |
144 | .coa_compress = null_compress, |
145 | .coa_decompress = null_compress } } |
146 | } }; |
147 | |
148 | MODULE_ALIAS("compress_null"); |
149 | MODULE_ALIAS("digest_null"); |
150 | MODULE_ALIAS("cipher_null"); |
151 | |
152 | static int __init crypto_null_mod_init(void) |
153 | { |
154 | int ret = 0; |
155 | |
156 | ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs)); |
157 | if (ret < 0) |
158 | goto out; |
159 | |
160 | ret = crypto_register_shash(&digest_null); |
161 | if (ret < 0) |
162 | goto out_unregister_algs; |
163 | |
164 | return 0; |
165 | |
166 | out_unregister_algs: |
167 | crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs)); |
168 | out: |
169 | return ret; |
170 | } |
171 | |
172 | static void __exit crypto_null_mod_fini(void) |
173 | { |
174 | crypto_unregister_shash(&digest_null); |
175 | crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs)); |
176 | } |
177 | |
178 | module_init(crypto_null_mod_init); |
179 | module_exit(crypto_null_mod_fini); |
180 | |
181 | MODULE_LICENSE("GPL"); |
182 | MODULE_DESCRIPTION("Null Cryptographic Algorithms"); |
183 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9