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 void (*free)(struct crypto_instance *inst);
36 unsigned int maskclear;
41 struct crypto_instance {
42 struct crypto_alg alg;
44 struct crypto_template *tmpl;
45 struct hlist_node list;
47 void *__ctx[] CRYPTO_MINALIGN_ATTR;
50 struct crypto_template {
51 struct list_head list;
52 struct hlist_head instances;
53 struct module *module;
55 struct crypto_instance *(*alloc)(struct rtattr **tb);
56 void (*free)(struct crypto_instance *inst);
57 int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
59 char name[CRYPTO_MAX_ALG_NAME];
63 struct list_head list;
64 struct crypto_alg *alg;
65 struct crypto_instance *inst;
66 const struct crypto_type *frontend;
71 struct list_head list;
72 struct list_head *backlog;
75 unsigned int max_qlen;
79 struct scatterlist *sg;
83 struct blkcipher_walk {
96 struct scatter_walk in;
99 struct scatter_walk out;
108 unsigned int walk_blocksize;
109 unsigned int cipher_blocksize;
110 unsigned int alignmask;
113 struct ablkcipher_walk {
119 struct scatter_walk in;
121 struct scatter_walk out;
123 struct list_head buffers;
127 unsigned int blocksize;
130 extern const struct crypto_type crypto_ablkcipher_type;
131 extern const struct crypto_type crypto_blkcipher_type;
133 void crypto_mod_put(struct crypto_alg *alg);
135 int crypto_register_template(struct crypto_template *tmpl);
136 void crypto_unregister_template(struct crypto_template *tmpl);
137 struct crypto_template *crypto_lookup_template(const char *name);
139 int crypto_register_instance(struct crypto_template *tmpl,
140 struct crypto_instance *inst);
141 int crypto_unregister_instance(struct crypto_instance *inst);
143 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
144 struct crypto_instance *inst, u32 mask);
145 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
146 struct crypto_instance *inst,
147 const struct crypto_type *frontend);
148 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
151 void crypto_drop_spawn(struct crypto_spawn *spawn);
152 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
154 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
156 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
157 struct crypto_instance *inst)
162 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
163 int crypto_check_attr_type(struct rtattr **tb, u32 type);
164 const char *crypto_attr_alg_name(struct rtattr *rta);
165 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
166 const struct crypto_type *frontend,
169 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
172 return crypto_attr_alg2(rta, NULL, type, mask);
175 int crypto_attr_u32(struct rtattr *rta, u32 *num);
176 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
177 struct crypto_alg *alg);
178 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
180 struct crypto_instance *crypto_alloc_instance(const char *name,
181 struct crypto_alg *alg);
183 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
184 int crypto_enqueue_request(struct crypto_queue *queue,
185 struct crypto_async_request *request);
186 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
187 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
188 static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
193 void crypto_inc(u8 *a, unsigned int size);
194 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size);
196 static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
198 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
199 __builtin_constant_p(size) &&
200 (size % sizeof(unsigned long)) == 0) {
201 unsigned long *d = (unsigned long *)dst;
202 unsigned long *s = (unsigned long *)src;
206 size -= sizeof(unsigned long);
209 __crypto_xor(dst, dst, src, size);
213 static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,
216 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
217 __builtin_constant_p(size) &&
218 (size % sizeof(unsigned long)) == 0) {
219 unsigned long *d = (unsigned long *)dst;
220 unsigned long *s1 = (unsigned long *)src1;
221 unsigned long *s2 = (unsigned long *)src2;
224 *d++ = *s1++ ^ *s2++;
225 size -= sizeof(unsigned long);
228 __crypto_xor(dst, src1, src2, size);
232 int blkcipher_walk_done(struct blkcipher_desc *desc,
233 struct blkcipher_walk *walk, int err);
234 int blkcipher_walk_virt(struct blkcipher_desc *desc,
235 struct blkcipher_walk *walk);
236 int blkcipher_walk_phys(struct blkcipher_desc *desc,
237 struct blkcipher_walk *walk);
238 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
239 struct blkcipher_walk *walk,
240 unsigned int blocksize);
241 int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
242 struct blkcipher_walk *walk,
243 struct crypto_aead *tfm,
244 unsigned int blocksize);
246 int ablkcipher_walk_done(struct ablkcipher_request *req,
247 struct ablkcipher_walk *walk, int err);
248 int ablkcipher_walk_phys(struct ablkcipher_request *req,
249 struct ablkcipher_walk *walk);
250 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
252 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
254 return PTR_ALIGN(crypto_tfm_ctx(tfm),
255 crypto_tfm_alg_alignmask(tfm) + 1);
258 static inline struct crypto_instance *crypto_tfm_alg_instance(
259 struct crypto_tfm *tfm)
261 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
264 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
269 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
270 struct crypto_ablkcipher *tfm)
272 return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
275 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
277 return crypto_tfm_ctx(&tfm->base);
280 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
282 return crypto_tfm_ctx_aligned(&tfm->base);
285 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
286 struct crypto_spawn *spawn)
288 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
289 u32 mask = CRYPTO_ALG_TYPE_MASK;
291 return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
294 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
296 return crypto_tfm_ctx(&tfm->base);
299 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
301 return crypto_tfm_ctx_aligned(&tfm->base);
304 static inline struct crypto_cipher *crypto_spawn_cipher(
305 struct crypto_spawn *spawn)
307 u32 type = CRYPTO_ALG_TYPE_CIPHER;
308 u32 mask = CRYPTO_ALG_TYPE_MASK;
310 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
313 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
315 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
318 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
319 struct scatterlist *dst,
320 struct scatterlist *src,
325 walk->total = nbytes;
328 static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
329 struct scatterlist *dst,
330 struct scatterlist *src,
335 walk->total = nbytes;
336 INIT_LIST_HEAD(&walk->buffers);
339 static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
341 if (unlikely(!list_empty(&walk->buffers)))
342 __ablkcipher_walk_complete(walk);
345 static inline struct crypto_async_request *crypto_get_backlog(
346 struct crypto_queue *queue)
348 return queue->backlog == &queue->list ? NULL :
349 container_of(queue->backlog, struct crypto_async_request, list);
352 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
353 struct ablkcipher_request *request)
355 return crypto_enqueue_request(queue, &request->base);
358 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
359 struct crypto_queue *queue)
361 return ablkcipher_request_cast(crypto_dequeue_request(queue));
364 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
369 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
370 struct crypto_ablkcipher *tfm)
372 return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
375 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
378 return crypto_attr_alg(tb[1], type, mask);
381 static inline int crypto_requires_off(u32 type, u32 mask, u32 off)
383 return (type ^ off) & mask & off;
387 * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
388 * Otherwise returns zero.
390 static inline int crypto_requires_sync(u32 type, u32 mask)
392 return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);
395 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
398 * crypto_memneq - Compare two areas of memory without leaking
399 * timing information.
401 * @a: One area of memory
402 * @b: Another area of memory
403 * @size: The size of the area.
405 * Returns 0 when data is equal, 1 otherwise.
407 static inline int crypto_memneq(const void *a, const void *b, size_t size)
409 return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
412 static inline void crypto_yield(u32 flags)
414 #if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY)
415 if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
420 #endif /* _CRYPTO_ALGAPI_H */