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 #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
19 struct module;
20 struct rtattr;
21 struct seq_file;
22
23 struct crypto_type {
24 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
25 unsigned int (*extsize)(struct crypto_alg *alg,
26 const struct crypto_type *frontend);
27 int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
28 int (*init_tfm)(struct crypto_tfm *tfm,
29 const struct crypto_type *frontend);
30 void (*show)(struct seq_file *m, struct crypto_alg *alg);
31 struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask);
32
33 unsigned int type;
34 unsigned int maskclear;
35 unsigned int maskset;
36 unsigned int tfmsize;
37 };
38
39 struct crypto_instance {
40 struct crypto_alg alg;
41
42 struct crypto_template *tmpl;
43 struct hlist_node list;
44
45 void *__ctx[] CRYPTO_MINALIGN_ATTR;
46 };
47
48 struct crypto_template {
49 struct list_head list;
50 struct hlist_head instances;
51 struct module *module;
52
53 struct crypto_instance *(*alloc)(struct rtattr **tb);
54 void (*free)(struct crypto_instance *inst);
55
56 char name[CRYPTO_MAX_ALG_NAME];
57 };
58
59 struct crypto_spawn {
60 struct list_head list;
61 struct crypto_alg *alg;
62 struct crypto_instance *inst;
63 u32 mask;
64 };
65
66 struct crypto_queue {
67 struct list_head list;
68 struct list_head *backlog;
69
70 unsigned int qlen;
71 unsigned int max_qlen;
72 };
73
74 struct scatter_walk {
75 struct scatterlist *sg;
76 unsigned int offset;
77 };
78
79 struct blkcipher_walk {
80 union {
81 struct {
82 struct page *page;
83 unsigned long offset;
84 } phys;
85
86 struct {
87 u8 *page;
88 u8 *addr;
89 } virt;
90 } src, dst;
91
92 struct scatter_walk in;
93 unsigned int nbytes;
94
95 struct scatter_walk out;
96 unsigned int total;
97
98 void *page;
99 u8 *buffer;
100 u8 *iv;
101
102 int flags;
103 unsigned int blocksize;
104 };
105
106 extern const struct crypto_type crypto_ablkcipher_type;
107 extern const struct crypto_type crypto_aead_type;
108 extern const struct crypto_type crypto_blkcipher_type;
109 extern const struct crypto_type crypto_hash_type;
110
111 void crypto_mod_put(struct crypto_alg *alg);
112
113 int crypto_register_template(struct crypto_template *tmpl);
114 void crypto_unregister_template(struct crypto_template *tmpl);
115 struct crypto_template *crypto_lookup_template(const char *name);
116
117 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
118 struct crypto_instance *inst, u32 mask);
119 void crypto_drop_spawn(struct crypto_spawn *spawn);
120 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
121 u32 mask);
122
123 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
124 struct crypto_instance *inst)
125 {
126 spawn->inst = inst;
127 }
128
129 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
130 int crypto_check_attr_type(struct rtattr **tb, u32 type);
131 const char *crypto_attr_alg_name(struct rtattr *rta);
132 struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask);
133 int crypto_attr_u32(struct rtattr *rta, u32 *num);
134 struct crypto_instance *crypto_alloc_instance(const char *name,
135 struct crypto_alg *alg);
136
137 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
138 int crypto_enqueue_request(struct crypto_queue *queue,
139 struct crypto_async_request *request);
140 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset);
141 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
142 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
143
144 /* These functions require the input/output to be aligned as u32. */
145 void crypto_inc(u8 *a, unsigned int size);
146 void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
147
148 int blkcipher_walk_done(struct blkcipher_desc *desc,
149 struct blkcipher_walk *walk, int err);
150 int blkcipher_walk_virt(struct blkcipher_desc *desc,
151 struct blkcipher_walk *walk);
152 int blkcipher_walk_phys(struct blkcipher_desc *desc,
153 struct blkcipher_walk *walk);
154 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
155 struct blkcipher_walk *walk,
156 unsigned int blocksize);
157
158 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
159 {
160 unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
161 unsigned long align = crypto_tfm_alg_alignmask(tfm);
162
163 if (align <= crypto_tfm_ctx_alignment())
164 align = 1;
165 return (void *)ALIGN(addr, align);
166 }
167
168 static inline struct crypto_instance *crypto_tfm_alg_instance(
169 struct crypto_tfm *tfm)
170 {
171 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
172 }
173
174 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
175 {
176 return inst->__ctx;
177 }
178
179 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
180 struct crypto_ablkcipher *tfm)
181 {
182 return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
183 }
184
185 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
186 {
187 return crypto_tfm_ctx(&tfm->base);
188 }
189
190 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
191 {
192 return crypto_tfm_ctx_aligned(&tfm->base);
193 }
194
195 static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm)
196 {
197 return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead;
198 }
199
200 static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
201 {
202 return crypto_tfm_ctx(&tfm->base);
203 }
204
205 static inline struct crypto_instance *crypto_aead_alg_instance(
206 struct crypto_aead *aead)
207 {
208 return crypto_tfm_alg_instance(&aead->base);
209 }
210
211 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
212 struct crypto_spawn *spawn)
213 {
214 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
215 u32 mask = CRYPTO_ALG_TYPE_MASK;
216
217 return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
218 }
219
220 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
221 {
222 return crypto_tfm_ctx(&tfm->base);
223 }
224
225 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
226 {
227 return crypto_tfm_ctx_aligned(&tfm->base);
228 }
229
230 static inline struct crypto_cipher *crypto_spawn_cipher(
231 struct crypto_spawn *spawn)
232 {
233 u32 type = CRYPTO_ALG_TYPE_CIPHER;
234 u32 mask = CRYPTO_ALG_TYPE_MASK;
235
236 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
237 }
238
239 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
240 {
241 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
242 }
243
244 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
245 {
246 u32 type = CRYPTO_ALG_TYPE_HASH;
247 u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
248
249 return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
250 }
251
252 static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
253 {
254 return crypto_tfm_ctx(&tfm->base);
255 }
256
257 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
258 {
259 return crypto_tfm_ctx_aligned(&tfm->base);
260 }
261
262 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
263 struct scatterlist *dst,
264 struct scatterlist *src,
265 unsigned int nbytes)
266 {
267 walk->in.sg = src;
268 walk->out.sg = dst;
269 walk->total = nbytes;
270 }
271
272 static inline struct crypto_async_request *crypto_get_backlog(
273 struct crypto_queue *queue)
274 {
275 return queue->backlog == &queue->list ? NULL :
276 container_of(queue->backlog, struct crypto_async_request, list);
277 }
278
279 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
280 struct ablkcipher_request *request)
281 {
282 return crypto_enqueue_request(queue, &request->base);
283 }
284
285 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
286 struct crypto_queue *queue)
287 {
288 return ablkcipher_request_cast(crypto_dequeue_request(queue));
289 }
290
291 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
292 {
293 return req->__ctx;
294 }
295
296 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
297 struct crypto_ablkcipher *tfm)
298 {
299 return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
300 }
301
302 static inline void *aead_request_ctx(struct aead_request *req)
303 {
304 return req->__ctx;
305 }
306
307 static inline void aead_request_complete(struct aead_request *req, int err)
308 {
309 req->base.complete(&req->base, err);
310 }
311
312 static inline u32 aead_request_flags(struct aead_request *req)
313 {
314 return req->base.flags;
315 }
316
317 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
318 u32 type, u32 mask)
319 {
320 return crypto_attr_alg(tb[1], type, mask);
321 }
322
323 /*
324 * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
325 * Otherwise returns zero.
326 */
327 static inline int crypto_requires_sync(u32 type, u32 mask)
328 {
329 return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
330 }
331
332 #endif /* _CRYPTO_ALGAPI_H */
333
334
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