2 * Cryptographic API for algorithms (i.e., low-level API).
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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)
12 #ifndef _CRYPTO_ALGAPI_H
13 #define _CRYPTO_ALGAPI_H
15 #include <linux/crypto.h>
16 #include <linux/list.h>
17 #include <linux/kernel.h>
18 #include <linux/skbuff.h>
21 struct crypto_instance;
27 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
28 unsigned int (*extsize)(struct crypto_alg *alg);
29 int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
30 int (*init_tfm)(struct crypto_tfm *tfm);
31 void (*show)(struct seq_file *m, struct crypto_alg *alg);
32 int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
33 struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask);
34 void (*free)(struct crypto_instance *inst);
37 unsigned int maskclear;
42 struct crypto_instance {
43 struct crypto_alg alg;
45 struct crypto_template *tmpl;
46 struct hlist_node list;
48 void *__ctx[] CRYPTO_MINALIGN_ATTR;
51 struct crypto_template {
52 struct list_head list;
53 struct hlist_head instances;
54 struct module *module;
56 struct crypto_instance *(*alloc)(struct rtattr **tb);
57 void (*free)(struct crypto_instance *inst);
58 int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
60 char name[CRYPTO_MAX_ALG_NAME];
64 struct list_head list;
65 struct crypto_alg *alg;
66 struct crypto_instance *inst;
67 const struct crypto_type *frontend;
72 struct list_head list;
73 struct list_head *backlog;
76 unsigned int max_qlen;
80 struct scatterlist *sg;
84 struct blkcipher_walk {
97 struct scatter_walk in;
100 struct scatter_walk out;
109 unsigned int walk_blocksize;
110 unsigned int cipher_blocksize;
111 unsigned int alignmask;
114 struct ablkcipher_walk {
120 struct scatter_walk in;
122 struct scatter_walk out;
124 struct list_head buffers;
128 unsigned int blocksize;
131 extern const struct crypto_type crypto_ablkcipher_type;
132 extern const struct crypto_type crypto_blkcipher_type;
134 void crypto_mod_put(struct crypto_alg *alg);
136 int crypto_register_template(struct crypto_template *tmpl);
137 void crypto_unregister_template(struct crypto_template *tmpl);
138 struct crypto_template *crypto_lookup_template(const char *name);
140 int crypto_register_instance(struct crypto_template *tmpl,
141 struct crypto_instance *inst);
142 int crypto_unregister_instance(struct crypto_instance *inst);
144 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
145 struct crypto_instance *inst, u32 mask);
146 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
147 struct crypto_instance *inst,
148 const struct crypto_type *frontend);
149 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
152 void crypto_drop_spawn(struct crypto_spawn *spawn);
153 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
155 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
157 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
158 struct crypto_instance *inst)
163 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
164 int crypto_check_attr_type(struct rtattr **tb, u32 type);
165 const char *crypto_attr_alg_name(struct rtattr *rta);
166 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
167 const struct crypto_type *frontend,
170 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
173 return crypto_attr_alg2(rta, NULL, type, mask);
176 int crypto_attr_u32(struct rtattr *rta, u32 *num);
177 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
179 struct crypto_instance *crypto_alloc_instance(const char *name,
180 struct crypto_alg *alg);
182 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
183 int crypto_enqueue_request(struct crypto_queue *queue,
184 struct crypto_async_request *request);
185 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
186 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
188 /* These functions require the input/output to be aligned as u32. */
189 void crypto_inc(u8 *a, unsigned int size);
190 void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
192 int blkcipher_walk_done(struct blkcipher_desc *desc,
193 struct blkcipher_walk *walk, int err);
194 int blkcipher_walk_virt(struct blkcipher_desc *desc,
195 struct blkcipher_walk *walk);
196 int blkcipher_walk_phys(struct blkcipher_desc *desc,
197 struct blkcipher_walk *walk);
198 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
199 struct blkcipher_walk *walk,
200 unsigned int blocksize);
201 int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
202 struct blkcipher_walk *walk,
203 struct crypto_aead *tfm,
204 unsigned int blocksize);
206 int ablkcipher_walk_done(struct ablkcipher_request *req,
207 struct ablkcipher_walk *walk, int err);
208 int ablkcipher_walk_phys(struct ablkcipher_request *req,
209 struct ablkcipher_walk *walk);
210 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
212 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
214 return PTR_ALIGN(crypto_tfm_ctx(tfm),
215 crypto_tfm_alg_alignmask(tfm) + 1);
218 static inline struct crypto_instance *crypto_tfm_alg_instance(
219 struct crypto_tfm *tfm)
221 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
224 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
229 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
230 struct crypto_ablkcipher *tfm)
232 return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
235 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
237 return crypto_tfm_ctx(&tfm->base);
240 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
242 return crypto_tfm_ctx_aligned(&tfm->base);
245 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
246 struct crypto_spawn *spawn)
248 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
249 u32 mask = CRYPTO_ALG_TYPE_MASK;
251 return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
254 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
256 return crypto_tfm_ctx(&tfm->base);
259 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
261 return crypto_tfm_ctx_aligned(&tfm->base);
264 static inline struct crypto_cipher *crypto_spawn_cipher(
265 struct crypto_spawn *spawn)
267 u32 type = CRYPTO_ALG_TYPE_CIPHER;
268 u32 mask = CRYPTO_ALG_TYPE_MASK;
270 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
273 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
275 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
278 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
280 u32 type = CRYPTO_ALG_TYPE_HASH;
281 u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
283 return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
286 static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
288 return crypto_tfm_ctx(&tfm->base);
291 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
293 return crypto_tfm_ctx_aligned(&tfm->base);
296 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
297 struct scatterlist *dst,
298 struct scatterlist *src,
303 walk->total = nbytes;
306 static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
307 struct scatterlist *dst,
308 struct scatterlist *src,
313 walk->total = nbytes;
314 INIT_LIST_HEAD(&walk->buffers);
317 static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
319 if (unlikely(!list_empty(&walk->buffers)))
320 __ablkcipher_walk_complete(walk);
323 static inline struct crypto_async_request *crypto_get_backlog(
324 struct crypto_queue *queue)
326 return queue->backlog == &queue->list ? NULL :
327 container_of(queue->backlog, struct crypto_async_request, list);
330 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
331 struct ablkcipher_request *request)
333 return crypto_enqueue_request(queue, &request->base);
336 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
337 struct crypto_queue *queue)
339 return ablkcipher_request_cast(crypto_dequeue_request(queue));
342 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
347 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
348 struct crypto_ablkcipher *tfm)
350 return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
353 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
356 return crypto_attr_alg(tb[1], type, mask);
360 * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
361 * Otherwise returns zero.
363 static inline int crypto_requires_sync(u32 type, u32 mask)
365 return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
368 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
371 * crypto_memneq - Compare two areas of memory without leaking
372 * timing information.
374 * @a: One area of memory
375 * @b: Another area of memory
376 * @size: The size of the area.
378 * Returns 0 when data is equal, 1 otherwise.
380 static inline int crypto_memneq(const void *a, const void *b, size_t size)
382 return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
385 static inline void crypto_yield(u32 flags)
387 if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
391 #endif /* _CRYPTO_ALGAPI_H */