projects/linux·blob v2.6.28 · refs

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1/*
2 * Cryptographic API for algorithms (i.e., low-level API).
3 *
4 * Copyright (c) 2006 Herbert Xu <[email protected]>
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#ifndef _CRYPTO_ALGAPI_H
13#define _CRYPTO_ALGAPI_H
14
15#include <linux/crypto.h>
16#include <linux/list.h>
17#include <linux/kernel.h>
18
19struct module;
20struct rtattr;
21struct seq_file;
22
23struct crypto_type {
24 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
25 int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
26 void (*exit)(struct crypto_tfm *tfm);
27 void (*show)(struct seq_file *m, struct crypto_alg *alg);
28};
29
30struct crypto_instance {
31 struct crypto_alg alg;
32
33 struct crypto_template *tmpl;
34 struct hlist_node list;
35
36 void *__ctx[] CRYPTO_MINALIGN_ATTR;
37};
38
39struct crypto_template {
40 struct list_head list;
41 struct hlist_head instances;
42 struct module *module;
43
44 struct crypto_instance *(*alloc)(struct rtattr **tb);
45 void (*free)(struct crypto_instance *inst);
46
47 char name[CRYPTO_MAX_ALG_NAME];
48};
49
50struct crypto_spawn {
51 struct list_head list;
52 struct crypto_alg *alg;
53 struct crypto_instance *inst;
54 u32 mask;
55};
56
57struct crypto_queue {
58 struct list_head list;
59 struct list_head *backlog;
60
61 unsigned int qlen;
62 unsigned int max_qlen;
63};
64
65struct scatter_walk {
66 struct scatterlist *sg;
67 unsigned int offset;
68};
69
70struct blkcipher_walk {
71 union {
72 struct {
73 struct page *page;
74 unsigned long offset;
75 } phys;
76
77 struct {
78 u8 *page;
79 u8 *addr;
80 } virt;
81 } src, dst;
82
83 struct scatter_walk in;
84 unsigned int nbytes;
85
86 struct scatter_walk out;
87 unsigned int total;
88
89 void *page;
90 u8 *buffer;
91 u8 *iv;
92
93 int flags;
94 unsigned int blocksize;
95};
96
97extern const struct crypto_type crypto_ablkcipher_type;
98extern const struct crypto_type crypto_aead_type;
99extern const struct crypto_type crypto_blkcipher_type;
100extern const struct crypto_type crypto_hash_type;
101
102void crypto_mod_put(struct crypto_alg *alg);
103
104int crypto_register_template(struct crypto_template *tmpl);
105void crypto_unregister_template(struct crypto_template *tmpl);
106struct crypto_template *crypto_lookup_template(const char *name);
107
108int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
109 struct crypto_instance *inst, u32 mask);
110void crypto_drop_spawn(struct crypto_spawn *spawn);
111struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
112 u32 mask);
113
114static inline void crypto_set_spawn(struct crypto_spawn *spawn,
115 struct crypto_instance *inst)
116{
117 spawn->inst = inst;
118}
119
120struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
121int crypto_check_attr_type(struct rtattr **tb, u32 type);
122const char *crypto_attr_alg_name(struct rtattr *rta);
123struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask);
124int crypto_attr_u32(struct rtattr *rta, u32 *num);
125struct crypto_instance *crypto_alloc_instance(const char *name,
126 struct crypto_alg *alg);
127
128void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
129int crypto_enqueue_request(struct crypto_queue *queue,
130 struct crypto_async_request *request);
131struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
132int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
133
134/* These functions require the input/output to be aligned as u32. */
135void crypto_inc(u8 *a, unsigned int size);
136void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
137
138int blkcipher_walk_done(struct blkcipher_desc *desc,
139 struct blkcipher_walk *walk, int err);
140int blkcipher_walk_virt(struct blkcipher_desc *desc,
141 struct blkcipher_walk *walk);
142int blkcipher_walk_phys(struct blkcipher_desc *desc,
143 struct blkcipher_walk *walk);
144int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
145 struct blkcipher_walk *walk,
146 unsigned int blocksize);
147
148static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
149{
150 unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
151 unsigned long align = crypto_tfm_alg_alignmask(tfm);
152
153 if (align <= crypto_tfm_ctx_alignment())
154 align = 1;
155 return (void *)ALIGN(addr, align);
156}
157
158static inline struct crypto_instance *crypto_tfm_alg_instance(
159 struct crypto_tfm *tfm)
160{
161 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
162}
163
164static inline void *crypto_instance_ctx(struct crypto_instance *inst)
165{
166 return inst->__ctx;
167}
168
169static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
170 struct crypto_ablkcipher *tfm)
171{
172 return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
173}
174
175static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
176{
177 return crypto_tfm_ctx(&tfm->base);
178}
179
180static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
181{
182 return crypto_tfm_ctx_aligned(&tfm->base);
183}
184
185static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm)
186{
187 return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead;
188}
189
190static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
191{
192 return crypto_tfm_ctx(&tfm->base);
193}
194
195static inline struct crypto_instance *crypto_aead_alg_instance(
196 struct crypto_aead *aead)
197{
198 return crypto_tfm_alg_instance(&aead->base);
199}
200
201static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
202 struct crypto_spawn *spawn)
203{
204 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
205 u32 mask = CRYPTO_ALG_TYPE_MASK;
206
207 return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
208}
209
210static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
211{
212 return crypto_tfm_ctx(&tfm->base);
213}
214
215static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
216{
217 return crypto_tfm_ctx_aligned(&tfm->base);
218}
219
220static inline struct crypto_cipher *crypto_spawn_cipher(
221 struct crypto_spawn *spawn)
222{
223 u32 type = CRYPTO_ALG_TYPE_CIPHER;
224 u32 mask = CRYPTO_ALG_TYPE_MASK;
225
226 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
227}
228
229static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
230{
231 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
232}
233
234static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
235{
236 u32 type = CRYPTO_ALG_TYPE_HASH;
237 u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
238
239 return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
240}
241
242static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
243{
244 return crypto_tfm_ctx_aligned(&tfm->base);
245}
246
247static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
248 struct scatterlist *dst,
249 struct scatterlist *src,
250 unsigned int nbytes)
251{
252 walk->in.sg = src;
253 walk->out.sg = dst;
254 walk->total = nbytes;
255}
256
257static inline struct crypto_async_request *crypto_get_backlog(
258 struct crypto_queue *queue)
259{
260 return queue->backlog == &queue->list ? NULL :
261 container_of(queue->backlog, struct crypto_async_request, list);
262}
263
264static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
265 struct ablkcipher_request *request)
266{
267 return crypto_enqueue_request(queue, &request->base);
268}
269
270static inline struct ablkcipher_request *ablkcipher_dequeue_request(
271 struct crypto_queue *queue)
272{
273 return ablkcipher_request_cast(crypto_dequeue_request(queue));
274}
275
276static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
277{
278 return req->__ctx;
279}
280
281static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
282 struct crypto_ablkcipher *tfm)
283{
284 return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
285}
286
287static inline void *aead_request_ctx(struct aead_request *req)
288{
289 return req->__ctx;
290}
291
292static inline void aead_request_complete(struct aead_request *req, int err)
293{
294 req->base.complete(&req->base, err);
295}
296
297static inline u32 aead_request_flags(struct aead_request *req)
298{
299 return req->base.flags;
300}
301
302static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
303 u32 type, u32 mask)
304{
305 return crypto_attr_alg(tb[1], type, mask);
306}
307
308/*
309 * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
310 * Otherwise returns zero.
311 */
312static inline int crypto_requires_sync(u32 type, u32 mask)
313{
314 return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
315}
316
317#endif /* _CRYPTO_ALGAPI_H */
318