Blame view

crypto/crypto_null.c 4.93 KB
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
  /* 
   * Cryptographic API.
   *
   * Null algorithms, aka Much Ado About Nothing.
   *
   * These are needed for IPsec, and may be useful in general for
   * testing & debugging.
   * 
   * The null cipher is compliant with RFC2410.
   *
   * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   *
   * 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.
   *
   */
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
19

d35d2454c   Herbert Xu   crypto: null - Sw...
20
  #include <crypto/internal/hash.h>
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
21
  #include <crypto/internal/skcipher.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
22
23
24
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/mm.h>
d0856009d   Patrick McHardy   [PATCH] crypto: f...
25
  #include <linux/string.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
26
27
28
29
  
  #define NULL_KEY_SIZE		0
  #define NULL_BLOCK_SIZE		1
  #define NULL_DIGEST_SIZE	0
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
30
  #define NULL_IV_SIZE		0
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
31

6c2bb98bc   Herbert Xu   [CRYPTO] all: Pas...
32
33
  static int null_compress(struct crypto_tfm *tfm, const u8 *src,
  			 unsigned int slen, u8 *dst, unsigned int *dlen)
d0856009d   Patrick McHardy   [PATCH] crypto: f...
34
35
36
37
38
39
40
  {
  	if (slen > *dlen)
  		return -EINVAL;
  	memcpy(dst, src, slen);
  	*dlen = slen;
  	return 0;
  }
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
41

d35d2454c   Herbert Xu   crypto: null - Sw...
42
43
44
45
  static int null_init(struct shash_desc *desc)
  {
  	return 0;
  }
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
46

d35d2454c   Herbert Xu   crypto: null - Sw...
47
48
49
50
51
  static int null_update(struct shash_desc *desc, const u8 *data,
  		       unsigned int len)
  {
  	return 0;
  }
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
52

d35d2454c   Herbert Xu   crypto: null - Sw...
53
54
55
56
57
58
59
60
61
62
63
64
65
66
  static int null_final(struct shash_desc *desc, u8 *out)
  {
  	return 0;
  }
  
  static int null_digest(struct shash_desc *desc, const u8 *data,
  		       unsigned int len, u8 *out)
  {
  	return 0;
  }
  
  static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key,
  			    unsigned int keylen)
  { return 0; }
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
67

6c2bb98bc   Herbert Xu   [CRYPTO] all: Pas...
68
  static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
560c06ae1   Herbert Xu   [CRYPTO] api: Get...
69
  		       unsigned int keylen)
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
70
  { return 0; }
6c2bb98bc   Herbert Xu   [CRYPTO] all: Pas...
71
  static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
d0856009d   Patrick McHardy   [PATCH] crypto: f...
72
73
74
  {
  	memcpy(dst, src, NULL_BLOCK_SIZE);
  }
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
75

3631c650c   Herbert Xu   [CRYPTO] null: Ad...
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
  static int skcipher_null_crypt(struct blkcipher_desc *desc,
  			       struct scatterlist *dst,
  			       struct scatterlist *src, unsigned int nbytes)
  {
  	struct blkcipher_walk walk;
  	int err;
  
  	blkcipher_walk_init(&walk, dst, src, nbytes);
  	err = blkcipher_walk_virt(desc, &walk);
  
  	while (walk.nbytes) {
  		if (walk.src.virt.addr != walk.dst.virt.addr)
  			memcpy(walk.dst.virt.addr, walk.src.virt.addr,
  			       walk.nbytes);
  		err = blkcipher_walk_done(desc, &walk, 0);
  	}
  
  	return err;
  }
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
95
96
97
98
99
100
101
102
103
  static struct crypto_alg compress_null = {
  	.cra_name		=	"compress_null",
  	.cra_flags		=	CRYPTO_ALG_TYPE_COMPRESS,
  	.cra_blocksize		=	NULL_BLOCK_SIZE,
  	.cra_ctxsize		=	0,
  	.cra_module		=	THIS_MODULE,
  	.cra_list		=       LIST_HEAD_INIT(compress_null.cra_list),
  	.cra_u			=	{ .compress = {
  	.coa_compress 		=	null_compress,
d0856009d   Patrick McHardy   [PATCH] crypto: f...
104
  	.coa_decompress		=	null_compress } }
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
105
  };
d35d2454c   Herbert Xu   crypto: null - Sw...
106
107
108
109
110
111
112
113
114
115
116
117
118
119
  static struct shash_alg digest_null = {
  	.digestsize		=	NULL_DIGEST_SIZE,
  	.setkey   		=	null_hash_setkey,
  	.init   		=	null_init,
  	.update 		=	null_update,
  	.finup 			=	null_digest,
  	.digest 		=	null_digest,
  	.final  		=	null_final,
  	.base			=	{
  		.cra_name		=	"digest_null",
  		.cra_flags		=	CRYPTO_ALG_TYPE_SHASH,
  		.cra_blocksize		=	NULL_BLOCK_SIZE,
  		.cra_module		=	THIS_MODULE,
  	}
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
120
121
122
123
124
125
126
127
128
129
130
131
132
  };
  
  static struct crypto_alg cipher_null = {
  	.cra_name		=	"cipher_null",
  	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
  	.cra_blocksize		=	NULL_BLOCK_SIZE,
  	.cra_ctxsize		=	0,
  	.cra_module		=	THIS_MODULE,
  	.cra_list		=	LIST_HEAD_INIT(cipher_null.cra_list),
  	.cra_u			=	{ .cipher = {
  	.cia_min_keysize	=	NULL_KEY_SIZE,
  	.cia_max_keysize	=	NULL_KEY_SIZE,
  	.cia_setkey		= 	null_setkey,
d0856009d   Patrick McHardy   [PATCH] crypto: f...
133
134
  	.cia_encrypt		=	null_crypt,
  	.cia_decrypt		=	null_crypt } }
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
135
  };
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
  static struct crypto_alg skcipher_null = {
  	.cra_name		=	"ecb(cipher_null)",
  	.cra_driver_name	=	"ecb-cipher_null",
  	.cra_priority		=	100,
  	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
  	.cra_blocksize		=	NULL_BLOCK_SIZE,
  	.cra_type		=	&crypto_blkcipher_type,
  	.cra_ctxsize		=	0,
  	.cra_module		=	THIS_MODULE,
  	.cra_list		=	LIST_HEAD_INIT(skcipher_null.cra_list),
  	.cra_u			=	{ .blkcipher = {
  	.min_keysize		=	NULL_KEY_SIZE,
  	.max_keysize		=	NULL_KEY_SIZE,
  	.ivsize			=	NULL_IV_SIZE,
  	.setkey			= 	null_setkey,
  	.encrypt		=	skcipher_null_crypt,
  	.decrypt		=	skcipher_null_crypt } }
  };
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
154
155
156
  MODULE_ALIAS("compress_null");
  MODULE_ALIAS("digest_null");
  MODULE_ALIAS("cipher_null");
3af5b90bd   Kamalesh Babulal   [CRYPTO] all: Cle...
157
  static int __init crypto_null_mod_init(void)
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
158
159
160
161
162
163
  {
  	int ret = 0;
  	
  	ret = crypto_register_alg(&cipher_null);
  	if (ret < 0)
  		goto out;
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
164
165
166
  	ret = crypto_register_alg(&skcipher_null);
  	if (ret < 0)
  		goto out_unregister_cipher;
d35d2454c   Herbert Xu   crypto: null - Sw...
167
  	ret = crypto_register_shash(&digest_null);
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
168
169
  	if (ret < 0)
  		goto out_unregister_skcipher;
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
170
171
  
  	ret = crypto_register_alg(&compress_null);
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
172
173
  	if (ret < 0)
  		goto out_unregister_digest;
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
174
175
176
  
  out:	
  	return ret;
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
177
178
  
  out_unregister_digest:
d35d2454c   Herbert Xu   crypto: null - Sw...
179
  	crypto_unregister_shash(&digest_null);
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
180
181
182
183
184
  out_unregister_skcipher:
  	crypto_unregister_alg(&skcipher_null);
  out_unregister_cipher:
  	crypto_unregister_alg(&cipher_null);
  	goto out;
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
185
  }
3af5b90bd   Kamalesh Babulal   [CRYPTO] all: Cle...
186
  static void __exit crypto_null_mod_fini(void)
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
187
188
  {
  	crypto_unregister_alg(&compress_null);
d35d2454c   Herbert Xu   crypto: null - Sw...
189
  	crypto_unregister_shash(&digest_null);
3631c650c   Herbert Xu   [CRYPTO] null: Ad...
190
  	crypto_unregister_alg(&skcipher_null);
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
191
192
  	crypto_unregister_alg(&cipher_null);
  }
3af5b90bd   Kamalesh Babulal   [CRYPTO] all: Cle...
193
194
  module_init(crypto_null_mod_init);
  module_exit(crypto_null_mod_fini);
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
195
196
197
  
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("Null Cryptographic Algorithms");