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/internal/hash.h> |
21 | #include <crypto/internal/skcipher.h> |
22 | #include <linux/init.h> |
23 | #include <linux/module.h> |
24 | #include <linux/mm.h> |
25 | #include <linux/string.h> |
26 | |
27 | #define NULL_KEY_SIZE 0 |
28 | #define NULL_BLOCK_SIZE 1 |
29 | #define NULL_DIGEST_SIZE 0 |
30 | #define NULL_IV_SIZE 0 |
31 | |
32 | static int null_compress(struct crypto_tfm *tfm, const u8 *src, |
33 | unsigned int slen, u8 *dst, unsigned int *dlen) |
34 | { |
35 | if (slen > *dlen) |
36 | return -EINVAL; |
37 | memcpy(dst, src, slen); |
38 | *dlen = slen; |
39 | return 0; |
40 | } |
41 | |
42 | static int null_init(struct shash_desc *desc) |
43 | { |
44 | return 0; |
45 | } |
46 | |
47 | static int null_update(struct shash_desc *desc, const u8 *data, |
48 | unsigned int len) |
49 | { |
50 | return 0; |
51 | } |
52 | |
53 | static int null_final(struct shash_desc *desc, u8 *out) |
54 | { |
55 | return 0; |
56 | } |
57 | |
58 | static int null_digest(struct shash_desc *desc, const u8 *data, |
59 | unsigned int len, u8 *out) |
60 | { |
61 | return 0; |
62 | } |
63 | |
64 | static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key, |
65 | unsigned int keylen) |
66 | { return 0; } |
67 | |
68 | static int null_setkey(struct crypto_tfm *tfm, const u8 *key, |
69 | unsigned int keylen) |
70 | { return 0; } |
71 | |
72 | static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
73 | { |
74 | memcpy(dst, src, NULL_BLOCK_SIZE); |
75 | } |
76 | |
77 | static int skcipher_null_crypt(struct blkcipher_desc *desc, |
78 | struct scatterlist *dst, |
79 | struct scatterlist *src, unsigned int nbytes) |
80 | { |
81 | struct blkcipher_walk walk; |
82 | int err; |
83 | |
84 | blkcipher_walk_init(&walk, dst, src, nbytes); |
85 | err = blkcipher_walk_virt(desc, &walk); |
86 | |
87 | while (walk.nbytes) { |
88 | if (walk.src.virt.addr != walk.dst.virt.addr) |
89 | memcpy(walk.dst.virt.addr, walk.src.virt.addr, |
90 | walk.nbytes); |
91 | err = blkcipher_walk_done(desc, &walk, 0); |
92 | } |
93 | |
94 | return err; |
95 | } |
96 | |
97 | static struct crypto_alg compress_null = { |
98 | .cra_name = "compress_null", |
99 | .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, |
100 | .cra_blocksize = NULL_BLOCK_SIZE, |
101 | .cra_ctxsize = 0, |
102 | .cra_module = THIS_MODULE, |
103 | .cra_list = LIST_HEAD_INIT(compress_null.cra_list), |
104 | .cra_u = { .compress = { |
105 | .coa_compress = null_compress, |
106 | .coa_decompress = null_compress } } |
107 | }; |
108 | |
109 | static struct shash_alg digest_null = { |
110 | .digestsize = NULL_DIGEST_SIZE, |
111 | .setkey = null_hash_setkey, |
112 | .init = null_init, |
113 | .update = null_update, |
114 | .finup = null_digest, |
115 | .digest = null_digest, |
116 | .final = null_final, |
117 | .base = { |
118 | .cra_name = "digest_null", |
119 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
120 | .cra_blocksize = NULL_BLOCK_SIZE, |
121 | .cra_module = THIS_MODULE, |
122 | } |
123 | }; |
124 | |
125 | static struct crypto_alg cipher_null = { |
126 | .cra_name = "cipher_null", |
127 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
128 | .cra_blocksize = NULL_BLOCK_SIZE, |
129 | .cra_ctxsize = 0, |
130 | .cra_module = THIS_MODULE, |
131 | .cra_list = LIST_HEAD_INIT(cipher_null.cra_list), |
132 | .cra_u = { .cipher = { |
133 | .cia_min_keysize = NULL_KEY_SIZE, |
134 | .cia_max_keysize = NULL_KEY_SIZE, |
135 | .cia_setkey = null_setkey, |
136 | .cia_encrypt = null_crypt, |
137 | .cia_decrypt = null_crypt } } |
138 | }; |
139 | |
140 | static struct crypto_alg skcipher_null = { |
141 | .cra_name = "ecb(cipher_null)", |
142 | .cra_driver_name = "ecb-cipher_null", |
143 | .cra_priority = 100, |
144 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, |
145 | .cra_blocksize = NULL_BLOCK_SIZE, |
146 | .cra_type = &crypto_blkcipher_type, |
147 | .cra_ctxsize = 0, |
148 | .cra_module = THIS_MODULE, |
149 | .cra_list = LIST_HEAD_INIT(skcipher_null.cra_list), |
150 | .cra_u = { .blkcipher = { |
151 | .min_keysize = NULL_KEY_SIZE, |
152 | .max_keysize = NULL_KEY_SIZE, |
153 | .ivsize = NULL_IV_SIZE, |
154 | .setkey = null_setkey, |
155 | .encrypt = skcipher_null_crypt, |
156 | .decrypt = skcipher_null_crypt } } |
157 | }; |
158 | |
159 | MODULE_ALIAS("compress_null"); |
160 | MODULE_ALIAS("digest_null"); |
161 | MODULE_ALIAS("cipher_null"); |
162 | |
163 | static int __init crypto_null_mod_init(void) |
164 | { |
165 | int ret = 0; |
166 | |
167 | ret = crypto_register_alg(&cipher_null); |
168 | if (ret < 0) |
169 | goto out; |
170 | |
171 | ret = crypto_register_alg(&skcipher_null); |
172 | if (ret < 0) |
173 | goto out_unregister_cipher; |
174 | |
175 | ret = crypto_register_shash(&digest_null); |
176 | if (ret < 0) |
177 | goto out_unregister_skcipher; |
178 | |
179 | ret = crypto_register_alg(&compress_null); |
180 | if (ret < 0) |
181 | goto out_unregister_digest; |
182 | |
183 | out: |
184 | return ret; |
185 | |
186 | out_unregister_digest: |
187 | crypto_unregister_shash(&digest_null); |
188 | out_unregister_skcipher: |
189 | crypto_unregister_alg(&skcipher_null); |
190 | out_unregister_cipher: |
191 | crypto_unregister_alg(&cipher_null); |
192 | goto out; |
193 | } |
194 | |
195 | static void __exit crypto_null_mod_fini(void) |
196 | { |
197 | crypto_unregister_alg(&compress_null); |
198 | crypto_unregister_shash(&digest_null); |
199 | crypto_unregister_alg(&skcipher_null); |
200 | crypto_unregister_alg(&cipher_null); |
201 | } |
202 | |
203 | module_init(crypto_null_mod_init); |
204 | module_exit(crypto_null_mod_fini); |
205 | |
206 | MODULE_LICENSE("GPL"); |
207 | MODULE_DESCRIPTION("Null Cryptographic Algorithms"); |
208 |
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