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TOMOYO Linux Cross Reference
Linux/include/crypto/algapi.h

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  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 #include <linux/skbuff.h>
 19 
 20 struct crypto_aead;
 21 struct module;
 22 struct rtattr;
 23 struct seq_file;
 24 
 25 struct crypto_type {
 26         unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
 27         unsigned int (*extsize)(struct crypto_alg *alg);
 28         int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
 29         int (*init_tfm)(struct crypto_tfm *tfm);
 30         void (*show)(struct seq_file *m, struct crypto_alg *alg);
 31         int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
 32         struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask);
 33 
 34         unsigned int type;
 35         unsigned int maskclear;
 36         unsigned int maskset;
 37         unsigned int tfmsize;
 38 };
 39 
 40 struct crypto_instance {
 41         struct crypto_alg alg;
 42 
 43         struct crypto_template *tmpl;
 44         struct hlist_node list;
 45 
 46         void *__ctx[] CRYPTO_MINALIGN_ATTR;
 47 };
 48 
 49 struct crypto_template {
 50         struct list_head list;
 51         struct hlist_head instances;
 52         struct module *module;
 53 
 54         struct crypto_instance *(*alloc)(struct rtattr **tb);
 55         void (*free)(struct crypto_instance *inst);
 56         int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
 57 
 58         char name[CRYPTO_MAX_ALG_NAME];
 59 };
 60 
 61 struct crypto_spawn {
 62         struct list_head list;
 63         struct crypto_alg *alg;
 64         struct crypto_instance *inst;
 65         const struct crypto_type *frontend;
 66         u32 mask;
 67 };
 68 
 69 struct crypto_queue {
 70         struct list_head list;
 71         struct list_head *backlog;
 72 
 73         unsigned int qlen;
 74         unsigned int max_qlen;
 75 };
 76 
 77 struct scatter_walk {
 78         struct scatterlist *sg;
 79         unsigned int offset;
 80 };
 81 
 82 struct blkcipher_walk {
 83         union {
 84                 struct {
 85                         struct page *page;
 86                         unsigned long offset;
 87                 } phys;
 88 
 89                 struct {
 90                         u8 *page;
 91                         u8 *addr;
 92                 } virt;
 93         } src, dst;
 94 
 95         struct scatter_walk in;
 96         unsigned int nbytes;
 97 
 98         struct scatter_walk out;
 99         unsigned int total;
100 
101         void *page;
102         u8 *buffer;
103         u8 *iv;
104         unsigned int ivsize;
105 
106         int flags;
107         unsigned int walk_blocksize;
108         unsigned int cipher_blocksize;
109         unsigned int alignmask;
110 };
111 
112 struct ablkcipher_walk {
113         struct {
114                 struct page *page;
115                 unsigned int offset;
116         } src, dst;
117 
118         struct scatter_walk     in;
119         unsigned int            nbytes;
120         struct scatter_walk     out;
121         unsigned int            total;
122         struct list_head        buffers;
123         u8                      *iv_buffer;
124         u8                      *iv;
125         int                     flags;
126         unsigned int            blocksize;
127 };
128 
129 extern const struct crypto_type crypto_ablkcipher_type;
130 extern const struct crypto_type crypto_blkcipher_type;
131 
132 void crypto_mod_put(struct crypto_alg *alg);
133 
134 int crypto_register_template(struct crypto_template *tmpl);
135 void crypto_unregister_template(struct crypto_template *tmpl);
136 struct crypto_template *crypto_lookup_template(const char *name);
137 
138 int crypto_register_instance(struct crypto_template *tmpl,
139                              struct crypto_instance *inst);
140 int crypto_unregister_instance(struct crypto_instance *inst);
141 
142 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
143                       struct crypto_instance *inst, u32 mask);
144 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
145                        struct crypto_instance *inst,
146                        const struct crypto_type *frontend);
147 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
148                       u32 type, u32 mask);
149 
150 void crypto_drop_spawn(struct crypto_spawn *spawn);
151 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
152                                     u32 mask);
153 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
154 
155 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
156                                     struct crypto_instance *inst)
157 {
158         spawn->inst = inst;
159 }
160 
161 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
162 int crypto_check_attr_type(struct rtattr **tb, u32 type);
163 const char *crypto_attr_alg_name(struct rtattr *rta);
164 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
165                                     const struct crypto_type *frontend,
166                                     u32 type, u32 mask);
167 
168 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
169                                                  u32 type, u32 mask)
170 {
171         return crypto_attr_alg2(rta, NULL, type, mask);
172 }
173 
174 int crypto_attr_u32(struct rtattr *rta, u32 *num);
175 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
176                              unsigned int head);
177 struct crypto_instance *crypto_alloc_instance(const char *name,
178                                               struct crypto_alg *alg);
179 
180 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
181 int crypto_enqueue_request(struct crypto_queue *queue,
182                            struct crypto_async_request *request);
183 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset);
184 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
185 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
186 
187 /* These functions require the input/output to be aligned as u32. */
188 void crypto_inc(u8 *a, unsigned int size);
189 void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
190 
191 int blkcipher_walk_done(struct blkcipher_desc *desc,
192                         struct blkcipher_walk *walk, int err);
193 int blkcipher_walk_virt(struct blkcipher_desc *desc,
194                         struct blkcipher_walk *walk);
195 int blkcipher_walk_phys(struct blkcipher_desc *desc,
196                         struct blkcipher_walk *walk);
197 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
198                               struct blkcipher_walk *walk,
199                               unsigned int blocksize);
200 int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
201                                    struct blkcipher_walk *walk,
202                                    struct crypto_aead *tfm,
203                                    unsigned int blocksize);
204 
205 int ablkcipher_walk_done(struct ablkcipher_request *req,
206                          struct ablkcipher_walk *walk, int err);
207 int ablkcipher_walk_phys(struct ablkcipher_request *req,
208                          struct ablkcipher_walk *walk);
209 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
210 
211 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
212 {
213         return PTR_ALIGN(crypto_tfm_ctx(tfm),
214                          crypto_tfm_alg_alignmask(tfm) + 1);
215 }
216 
217 static inline struct crypto_instance *crypto_tfm_alg_instance(
218         struct crypto_tfm *tfm)
219 {
220         return container_of(tfm->__crt_alg, struct crypto_instance, alg);
221 }
222 
223 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
224 {
225         return inst->__ctx;
226 }
227 
228 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
229         struct crypto_ablkcipher *tfm)
230 {
231         return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
232 }
233 
234 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
235 {
236         return crypto_tfm_ctx(&tfm->base);
237 }
238 
239 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
240 {
241         return crypto_tfm_ctx_aligned(&tfm->base);
242 }
243 
244 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
245         struct crypto_spawn *spawn)
246 {
247         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
248         u32 mask = CRYPTO_ALG_TYPE_MASK;
249 
250         return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
251 }
252 
253 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
254 {
255         return crypto_tfm_ctx(&tfm->base);
256 }
257 
258 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
259 {
260         return crypto_tfm_ctx_aligned(&tfm->base);
261 }
262 
263 static inline struct crypto_cipher *crypto_spawn_cipher(
264         struct crypto_spawn *spawn)
265 {
266         u32 type = CRYPTO_ALG_TYPE_CIPHER;
267         u32 mask = CRYPTO_ALG_TYPE_MASK;
268 
269         return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
270 }
271 
272 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
273 {
274         return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
275 }
276 
277 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
278 {
279         u32 type = CRYPTO_ALG_TYPE_HASH;
280         u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
281 
282         return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
283 }
284 
285 static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
286 {
287         return crypto_tfm_ctx(&tfm->base);
288 }
289 
290 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
291 {
292         return crypto_tfm_ctx_aligned(&tfm->base);
293 }
294 
295 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
296                                        struct scatterlist *dst,
297                                        struct scatterlist *src,
298                                        unsigned int nbytes)
299 {
300         walk->in.sg = src;
301         walk->out.sg = dst;
302         walk->total = nbytes;
303 }
304 
305 static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
306                                         struct scatterlist *dst,
307                                         struct scatterlist *src,
308                                         unsigned int nbytes)
309 {
310         walk->in.sg = src;
311         walk->out.sg = dst;
312         walk->total = nbytes;
313         INIT_LIST_HEAD(&walk->buffers);
314 }
315 
316 static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
317 {
318         if (unlikely(!list_empty(&walk->buffers)))
319                 __ablkcipher_walk_complete(walk);
320 }
321 
322 static inline struct crypto_async_request *crypto_get_backlog(
323         struct crypto_queue *queue)
324 {
325         return queue->backlog == &queue->list ? NULL :
326                container_of(queue->backlog, struct crypto_async_request, list);
327 }
328 
329 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
330                                              struct ablkcipher_request *request)
331 {
332         return crypto_enqueue_request(queue, &request->base);
333 }
334 
335 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
336         struct crypto_queue *queue)
337 {
338         return ablkcipher_request_cast(crypto_dequeue_request(queue));
339 }
340 
341 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
342 {
343         return req->__ctx;
344 }
345 
346 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
347                                           struct crypto_ablkcipher *tfm)
348 {
349         return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
350 }
351 
352 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
353                                                      u32 type, u32 mask)
354 {
355         return crypto_attr_alg(tb[1], type, mask);
356 }
357 
358 /*
359  * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
360  * Otherwise returns zero.
361  */
362 static inline int crypto_requires_sync(u32 type, u32 mask)
363 {
364         return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
365 }
366 
367 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
368 
369 /**
370  * crypto_memneq - Compare two areas of memory without leaking
371  *                 timing information.
372  *
373  * @a: One area of memory
374  * @b: Another area of memory
375  * @size: The size of the area.
376  *
377  * Returns 0 when data is equal, 1 otherwise.
378  */
379 static inline int crypto_memneq(const void *a, const void *b, size_t size)
380 {
381         return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
382 }
383 
384 static inline void crypto_yield(u32 flags)
385 {
386         if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
387                 cond_resched();
388 }
389 
390 #endif  /* _CRYPTO_ALGAPI_H */
391 

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