]>
Commit | Line | Data |
---|---|---|
cce9e06d HX |
1 | /* |
2 | * Cryptographic API for algorithms (i.e., low-level API). | |
3 | * | |
4 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/errno.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/string.h> | |
18 | ||
19 | #include "internal.h" | |
20 | ||
21 | static inline int crypto_set_driver_name(struct crypto_alg *alg) | |
22 | { | |
23 | static const char suffix[] = "-generic"; | |
24 | char *driver_name = alg->cra_driver_name; | |
25 | int len; | |
26 | ||
27 | if (*driver_name) | |
28 | return 0; | |
29 | ||
30 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
31 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) | |
32 | return -ENAMETOOLONG; | |
33 | ||
34 | memcpy(driver_name + len, suffix, sizeof(suffix)); | |
35 | return 0; | |
36 | } | |
37 | ||
38 | int crypto_register_alg(struct crypto_alg *alg) | |
39 | { | |
40 | int ret; | |
41 | struct crypto_alg *q; | |
42 | ||
43 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) | |
44 | return -EINVAL; | |
45 | ||
46 | if (alg->cra_alignmask & alg->cra_blocksize) | |
47 | return -EINVAL; | |
48 | ||
49 | if (alg->cra_blocksize > PAGE_SIZE / 8) | |
50 | return -EINVAL; | |
51 | ||
52 | if (alg->cra_priority < 0) | |
53 | return -EINVAL; | |
54 | ||
55 | ret = crypto_set_driver_name(alg); | |
56 | if (unlikely(ret)) | |
57 | return ret; | |
58 | ||
59 | down_write(&crypto_alg_sem); | |
60 | ||
61 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
62 | if (q == alg) { | |
63 | ret = -EEXIST; | |
64 | goto out; | |
65 | } | |
66 | } | |
67 | ||
68 | list_add(&alg->cra_list, &crypto_alg_list); | |
69 | atomic_set(&alg->cra_refcnt, 1); | |
70 | out: | |
71 | up_write(&crypto_alg_sem); | |
72 | return ret; | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(crypto_register_alg); | |
75 | ||
76 | int crypto_unregister_alg(struct crypto_alg *alg) | |
77 | { | |
78 | int ret = -ENOENT; | |
79 | struct crypto_alg *q; | |
80 | ||
81 | down_write(&crypto_alg_sem); | |
82 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
83 | if (alg == q) { | |
84 | list_del(&alg->cra_list); | |
85 | ret = 0; | |
86 | goto out; | |
87 | } | |
88 | } | |
89 | out: | |
90 | up_write(&crypto_alg_sem); | |
91 | ||
92 | if (ret) | |
93 | return ret; | |
94 | ||
95 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
96 | if (alg->cra_destroy) | |
97 | alg->cra_destroy(alg); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
102 | ||
103 | static int __init crypto_algapi_init(void) | |
104 | { | |
105 | crypto_init_proc(); | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static void __exit crypto_algapi_exit(void) | |
110 | { | |
111 | crypto_exit_proc(); | |
112 | } | |
113 | ||
114 | module_init(crypto_algapi_init); | |
115 | module_exit(crypto_algapi_exit); | |
116 | ||
117 | MODULE_LICENSE("GPL"); | |
118 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |