1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Cryptographic API for algorithms (i.e., low-level API).
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
7 #ifndef _CRYPTO_ALGAPI_H
8 #define _CRYPTO_ALGAPI_H
10 #include <linux/crypto.h>
11 #include <linux/list.h>
12 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
16 * Maximum values for blocksize and alignmask, used to allocate
17 * static buffers that are big enough for any combination of
18 * algs and architectures. Ciphers have a lower maximum size.
20 #define MAX_ALGAPI_BLOCKSIZE 160
21 #define MAX_ALGAPI_ALIGNMASK 63
22 #define MAX_CIPHER_BLOCKSIZE 16
23 #define MAX_CIPHER_ALIGNMASK 15
26 struct crypto_instance;
32 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
33 unsigned int (*extsize)(struct crypto_alg *alg);
34 int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
35 int (*init_tfm)(struct crypto_tfm *tfm);
36 void (*show)(struct seq_file *m, struct crypto_alg *alg);
37 int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
38 void (*free)(struct crypto_instance *inst);
41 unsigned int maskclear;
46 struct crypto_instance {
47 struct crypto_alg alg;
49 struct crypto_template *tmpl;
50 struct hlist_node list;
52 void *__ctx[] CRYPTO_MINALIGN_ATTR;
55 struct crypto_template {
56 struct list_head list;
57 struct hlist_head instances;
58 struct module *module;
60 struct crypto_instance *(*alloc)(struct rtattr **tb);
61 void (*free)(struct crypto_instance *inst);
62 int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
64 char name[CRYPTO_MAX_ALG_NAME];
68 struct list_head list;
69 struct crypto_alg *alg;
70 struct crypto_instance *inst;
71 const struct crypto_type *frontend;
76 struct list_head list;
77 struct list_head *backlog;
80 unsigned int max_qlen;
84 struct scatterlist *sg;
88 struct blkcipher_walk {
101 struct scatter_walk in;
104 struct scatter_walk out;
113 unsigned int walk_blocksize;
114 unsigned int cipher_blocksize;
115 unsigned int alignmask;
118 struct ablkcipher_walk {
124 struct scatter_walk in;
126 struct scatter_walk out;
128 struct list_head buffers;
132 unsigned int blocksize;
135 extern const struct crypto_type crypto_ablkcipher_type;
136 extern const struct crypto_type crypto_blkcipher_type;
138 void crypto_mod_put(struct crypto_alg *alg);
140 int crypto_register_template(struct crypto_template *tmpl);
141 int crypto_register_templates(struct crypto_template *tmpls, int count);
142 void crypto_unregister_template(struct crypto_template *tmpl);
143 void crypto_unregister_templates(struct crypto_template *tmpls, int count);
144 struct crypto_template *crypto_lookup_template(const char *name);
146 int crypto_register_instance(struct crypto_template *tmpl,
147 struct crypto_instance *inst);
148 int crypto_unregister_instance(struct crypto_instance *inst);
150 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
151 struct crypto_instance *inst, u32 mask);
152 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
153 struct crypto_instance *inst,
154 const struct crypto_type *frontend);
155 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
158 void crypto_drop_spawn(struct crypto_spawn *spawn);
159 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
161 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
163 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
164 struct crypto_instance *inst)
169 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
170 int crypto_check_attr_type(struct rtattr **tb, u32 type);
171 const char *crypto_attr_alg_name(struct rtattr *rta);
172 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
173 const struct crypto_type *frontend,
176 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
179 return crypto_attr_alg2(rta, NULL, type, mask);
182 int crypto_attr_u32(struct rtattr *rta, u32 *num);
183 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
184 struct crypto_alg *alg);
185 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
188 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
189 int crypto_enqueue_request(struct crypto_queue *queue,
190 struct crypto_async_request *request);
191 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
192 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
193 static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
198 void crypto_inc(u8 *a, unsigned int size);
199 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size);
201 static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
203 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
204 __builtin_constant_p(size) &&
205 (size % sizeof(unsigned long)) == 0) {
206 unsigned long *d = (unsigned long *)dst;
207 unsigned long *s = (unsigned long *)src;
211 size -= sizeof(unsigned long);
214 __crypto_xor(dst, dst, src, size);
218 static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,
221 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
222 __builtin_constant_p(size) &&
223 (size % sizeof(unsigned long)) == 0) {
224 unsigned long *d = (unsigned long *)dst;
225 unsigned long *s1 = (unsigned long *)src1;
226 unsigned long *s2 = (unsigned long *)src2;
229 *d++ = *s1++ ^ *s2++;
230 size -= sizeof(unsigned long);
233 __crypto_xor(dst, src1, src2, size);
237 int blkcipher_walk_done(struct blkcipher_desc *desc,
238 struct blkcipher_walk *walk, int err);
239 int blkcipher_walk_virt(struct blkcipher_desc *desc,
240 struct blkcipher_walk *walk);
241 int blkcipher_walk_phys(struct blkcipher_desc *desc,
242 struct blkcipher_walk *walk);
243 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
244 struct blkcipher_walk *walk,
245 unsigned int blocksize);
246 int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
247 struct blkcipher_walk *walk,
248 struct crypto_aead *tfm,
249 unsigned int blocksize);
251 int ablkcipher_walk_done(struct ablkcipher_request *req,
252 struct ablkcipher_walk *walk, int err);
253 int ablkcipher_walk_phys(struct ablkcipher_request *req,
254 struct ablkcipher_walk *walk);
255 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
257 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
259 return PTR_ALIGN(crypto_tfm_ctx(tfm),
260 crypto_tfm_alg_alignmask(tfm) + 1);
263 static inline struct crypto_instance *crypto_tfm_alg_instance(
264 struct crypto_tfm *tfm)
266 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
269 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
274 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
275 struct crypto_ablkcipher *tfm)
277 return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
280 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
282 return crypto_tfm_ctx(&tfm->base);
285 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
287 return crypto_tfm_ctx_aligned(&tfm->base);
290 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
291 struct crypto_spawn *spawn)
293 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
294 u32 mask = CRYPTO_ALG_TYPE_MASK;
296 return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
299 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
301 return crypto_tfm_ctx(&tfm->base);
304 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
306 return crypto_tfm_ctx_aligned(&tfm->base);
309 static inline struct crypto_cipher *crypto_spawn_cipher(
310 struct crypto_spawn *spawn)
312 u32 type = CRYPTO_ALG_TYPE_CIPHER;
313 u32 mask = CRYPTO_ALG_TYPE_MASK;
315 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
318 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
320 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
323 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
324 struct scatterlist *dst,
325 struct scatterlist *src,
330 walk->total = nbytes;
333 static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
334 struct scatterlist *dst,
335 struct scatterlist *src,
340 walk->total = nbytes;
341 INIT_LIST_HEAD(&walk->buffers);
344 static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
346 if (unlikely(!list_empty(&walk->buffers)))
347 __ablkcipher_walk_complete(walk);
350 static inline struct crypto_async_request *crypto_get_backlog(
351 struct crypto_queue *queue)
353 return queue->backlog == &queue->list ? NULL :
354 container_of(queue->backlog, struct crypto_async_request, list);
357 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
358 struct ablkcipher_request *request)
360 return crypto_enqueue_request(queue, &request->base);
363 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
364 struct crypto_queue *queue)
366 return ablkcipher_request_cast(crypto_dequeue_request(queue));
369 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
374 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
375 struct crypto_ablkcipher *tfm)
377 return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
380 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
383 return crypto_attr_alg(tb[1], type, mask);
386 static inline int crypto_requires_off(u32 type, u32 mask, u32 off)
388 return (type ^ off) & mask & off;
392 * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
393 * Otherwise returns zero.
395 static inline int crypto_requires_sync(u32 type, u32 mask)
397 return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);
400 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
403 * crypto_memneq - Compare two areas of memory without leaking
404 * timing information.
406 * @a: One area of memory
407 * @b: Another area of memory
408 * @size: The size of the area.
410 * Returns 0 when data is equal, 1 otherwise.
412 static inline int crypto_memneq(const void *a, const void *b, size_t size)
414 return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
417 static inline void crypto_yield(u32 flags)
419 #if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY)
420 if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
425 int crypto_register_notifier(struct notifier_block *nb);
426 int crypto_unregister_notifier(struct notifier_block *nb);
428 /* Crypto notification events. */
430 CRYPTO_MSG_ALG_REQUEST,
431 CRYPTO_MSG_ALG_REGISTER,
432 CRYPTO_MSG_ALG_LOADED,
435 #endif /* _CRYPTO_ALGAPI_H */