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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> | |
4cc7720c | 16 | #include <linux/list.h> |
cce9e06d HX |
17 | #include <linux/module.h> |
18 | #include <linux/string.h> | |
19 | ||
20 | #include "internal.h" | |
21 | ||
4cc7720c HX |
22 | static LIST_HEAD(crypto_template_list); |
23 | ||
cce9e06d HX |
24 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
25 | { | |
26 | static const char suffix[] = "-generic"; | |
27 | char *driver_name = alg->cra_driver_name; | |
28 | int len; | |
29 | ||
30 | if (*driver_name) | |
31 | return 0; | |
32 | ||
33 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
34 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) | |
35 | return -ENAMETOOLONG; | |
36 | ||
37 | memcpy(driver_name + len, suffix, sizeof(suffix)); | |
38 | return 0; | |
39 | } | |
40 | ||
4cc7720c | 41 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 42 | { |
cce9e06d HX |
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; | |
cce9e06d | 54 | |
4cc7720c HX |
55 | return crypto_set_driver_name(alg); |
56 | } | |
57 | ||
58 | static int __crypto_register_alg(struct crypto_alg *alg) | |
59 | { | |
60 | struct crypto_alg *q; | |
61 | int ret = -EEXIST; | |
62 | ||
cce9e06d | 63 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 64 | if (q == alg) |
cce9e06d | 65 | goto out; |
cce9e06d HX |
66 | } |
67 | ||
68 | list_add(&alg->cra_list, &crypto_alg_list); | |
69 | atomic_set(&alg->cra_refcnt, 1); | |
4cc7720c | 70 | ret = 0; |
cce9e06d | 71 | out: |
cce9e06d HX |
72 | return ret; |
73 | } | |
4cc7720c HX |
74 | |
75 | int crypto_register_alg(struct crypto_alg *alg) | |
76 | { | |
77 | int err; | |
78 | ||
79 | err = crypto_check_alg(alg); | |
80 | if (err) | |
81 | return err; | |
82 | ||
83 | down_write(&crypto_alg_sem); | |
84 | err = __crypto_register_alg(alg); | |
85 | up_write(&crypto_alg_sem); | |
86 | ||
87 | return err; | |
88 | } | |
cce9e06d HX |
89 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
90 | ||
91 | int crypto_unregister_alg(struct crypto_alg *alg) | |
92 | { | |
93 | int ret = -ENOENT; | |
cce9e06d HX |
94 | |
95 | down_write(&crypto_alg_sem); | |
4cc7720c HX |
96 | if (likely(!list_empty(&alg->cra_list))) { |
97 | list_del_init(&alg->cra_list); | |
98 | ret = 0; | |
cce9e06d | 99 | } |
cce9e06d HX |
100 | up_write(&crypto_alg_sem); |
101 | ||
102 | if (ret) | |
103 | return ret; | |
104 | ||
105 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
106 | if (alg->cra_destroy) | |
107 | alg->cra_destroy(alg); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
112 | ||
4cc7720c HX |
113 | int crypto_register_template(struct crypto_template *tmpl) |
114 | { | |
115 | struct crypto_template *q; | |
116 | int err = -EEXIST; | |
117 | ||
118 | down_write(&crypto_alg_sem); | |
119 | ||
120 | list_for_each_entry(q, &crypto_template_list, list) { | |
121 | if (q == tmpl) | |
122 | goto out; | |
123 | } | |
124 | ||
125 | list_add(&tmpl->list, &crypto_template_list); | |
126 | err = 0; | |
127 | out: | |
128 | up_write(&crypto_alg_sem); | |
129 | return err; | |
130 | } | |
131 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
132 | ||
133 | void crypto_unregister_template(struct crypto_template *tmpl) | |
134 | { | |
135 | struct crypto_instance *inst; | |
136 | struct hlist_node *p, *n; | |
137 | struct hlist_head *list; | |
138 | ||
139 | down_write(&crypto_alg_sem); | |
140 | ||
141 | BUG_ON(list_empty(&tmpl->list)); | |
142 | list_del_init(&tmpl->list); | |
143 | ||
144 | list = &tmpl->instances; | |
145 | hlist_for_each_entry(inst, p, list, list) { | |
146 | BUG_ON(list_empty(&inst->alg.cra_list)); | |
147 | list_del_init(&inst->alg.cra_list); | |
148 | } | |
149 | ||
150 | up_write(&crypto_alg_sem); | |
151 | ||
152 | hlist_for_each_entry_safe(inst, p, n, list, list) { | |
153 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); | |
154 | tmpl->free(inst); | |
155 | } | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
158 | ||
159 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
160 | { | |
161 | struct crypto_template *q, *tmpl = NULL; | |
162 | ||
163 | down_read(&crypto_alg_sem); | |
164 | list_for_each_entry(q, &crypto_template_list, list) { | |
165 | if (strcmp(q->name, name)) | |
166 | continue; | |
167 | if (unlikely(!crypto_tmpl_get(q))) | |
168 | continue; | |
169 | ||
170 | tmpl = q; | |
171 | break; | |
172 | } | |
173 | up_read(&crypto_alg_sem); | |
174 | ||
175 | return tmpl; | |
176 | } | |
177 | ||
178 | struct crypto_template *crypto_lookup_template(const char *name) | |
179 | { | |
180 | return try_then_request_module(__crypto_lookup_template(name), name); | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
183 | ||
184 | int crypto_register_instance(struct crypto_template *tmpl, | |
185 | struct crypto_instance *inst) | |
186 | { | |
187 | int err = -EINVAL; | |
188 | ||
189 | if (inst->alg.cra_destroy) | |
190 | goto err; | |
191 | ||
192 | err = crypto_check_alg(&inst->alg); | |
193 | if (err) | |
194 | goto err; | |
195 | ||
196 | inst->alg.cra_module = tmpl->module; | |
197 | ||
198 | down_write(&crypto_alg_sem); | |
199 | ||
200 | err = __crypto_register_alg(&inst->alg); | |
201 | if (err) | |
202 | goto unlock; | |
203 | ||
204 | hlist_add_head(&inst->list, &tmpl->instances); | |
205 | inst->tmpl = tmpl; | |
206 | ||
207 | unlock: | |
208 | up_write(&crypto_alg_sem); | |
209 | ||
210 | err: | |
211 | return err; | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
214 | ||
cce9e06d HX |
215 | static int __init crypto_algapi_init(void) |
216 | { | |
217 | crypto_init_proc(); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static void __exit crypto_algapi_exit(void) | |
222 | { | |
223 | crypto_exit_proc(); | |
224 | } | |
225 | ||
226 | module_init(crypto_algapi_init); | |
227 | module_exit(crypto_algapi_exit); | |
228 | ||
229 | MODULE_LICENSE("GPL"); | |
230 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |