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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <[email protected]>
6 */
7#ifndef _CRYPTO_ALGAPI_H
8#define _CRYPTO_ALGAPI_H
9
10#include <linux/crypto.h>
11#include <linux/list.h>
12#include <linux/kernel.h>
13#include <linux/skbuff.h>
14
15/*
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.
19 */
20#define MAX_ALGAPI_BLOCKSIZE 160
21#define MAX_ALGAPI_ALIGNMASK 63
22#define MAX_CIPHER_BLOCKSIZE 16
23#define MAX_CIPHER_ALIGNMASK 15
24
25struct crypto_aead;
26struct crypto_instance;
27struct module;
28struct rtattr;
29struct seq_file;
30
31struct crypto_type {
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);
39
40 unsigned int type;
41 unsigned int maskclear;
42 unsigned int maskset;
43 unsigned int tfmsize;
44};
45
46struct crypto_instance {
47 struct crypto_alg alg;
48
49 struct crypto_template *tmpl;
50 struct hlist_node list;
51
52 void *__ctx[] CRYPTO_MINALIGN_ATTR;
53};
54
55struct crypto_template {
56 struct list_head list;
57 struct hlist_head instances;
58 struct module *module;
59
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);
63
64 char name[CRYPTO_MAX_ALG_NAME];
65};
66
67struct crypto_spawn {
68 struct list_head list;
69 struct crypto_alg *alg;
70 struct crypto_instance *inst;
71 const struct crypto_type *frontend;
72 u32 mask;
73};
74
75struct crypto_queue {
76 struct list_head list;
77 struct list_head *backlog;
78
79 unsigned int qlen;
80 unsigned int max_qlen;
81};
82
83struct scatter_walk {
84 struct scatterlist *sg;
85 unsigned int offset;
86};
87
88struct blkcipher_walk {
89 union {
90 struct {
91 struct page *page;
92 unsigned long offset;
93 } phys;
94
95 struct {
96 u8 *page;
97 u8 *addr;
98 } virt;
99 } src, dst;
100
101 struct scatter_walk in;
102 unsigned int nbytes;
103
104 struct scatter_walk out;
105 unsigned int total;
106
107 void *page;
108 u8 *buffer;
109 u8 *iv;
110 unsigned int ivsize;
111
112 int flags;
113 unsigned int walk_blocksize;
114 unsigned int cipher_blocksize;
115 unsigned int alignmask;
116};
117
118struct ablkcipher_walk {
119 struct {
120 struct page *page;
121 unsigned int offset;
122 } src, dst;
123
124 struct scatter_walk in;
125 unsigned int nbytes;
126 struct scatter_walk out;
127 unsigned int total;
128 struct list_head buffers;
129 u8 *iv_buffer;
130 u8 *iv;
131 int flags;
132 unsigned int blocksize;
133};
134
135extern const struct crypto_type crypto_ablkcipher_type;
136extern const struct crypto_type crypto_blkcipher_type;
137
138void crypto_mod_put(struct crypto_alg *alg);
139
140int crypto_register_template(struct crypto_template *tmpl);
141int crypto_register_templates(struct crypto_template *tmpls, int count);
142void crypto_unregister_template(struct crypto_template *tmpl);
143void crypto_unregister_templates(struct crypto_template *tmpls, int count);
144struct crypto_template *crypto_lookup_template(const char *name);
145
146int crypto_register_instance(struct crypto_template *tmpl,
147 struct crypto_instance *inst);
148int crypto_unregister_instance(struct crypto_instance *inst);
149
150int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
151 struct crypto_instance *inst, u32 mask);
152int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
153 struct crypto_instance *inst,
154 const struct crypto_type *frontend);
155int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
156 u32 type, u32 mask);
157
158void crypto_drop_spawn(struct crypto_spawn *spawn);
159struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
160 u32 mask);
161void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
162
163static inline void crypto_set_spawn(struct crypto_spawn *spawn,
164 struct crypto_instance *inst)
165{
166 spawn->inst = inst;
167}
168
169struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
170int crypto_check_attr_type(struct rtattr **tb, u32 type);
171const char *crypto_attr_alg_name(struct rtattr *rta);
172struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
173 const struct crypto_type *frontend,
174 u32 type, u32 mask);
175
176static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
177 u32 type, u32 mask)
178{
179 return crypto_attr_alg2(rta, NULL, type, mask);
180}
181
182int crypto_attr_u32(struct rtattr *rta, u32 *num);
183int crypto_inst_setname(struct crypto_instance *inst, const char *name,
184 struct crypto_alg *alg);
185void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
186 unsigned int head);
187
188void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
189int crypto_enqueue_request(struct crypto_queue *queue,
190 struct crypto_async_request *request);
191struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
192int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
193static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
194{
195 return queue->qlen;
196}
197
198void crypto_inc(u8 *a, unsigned int size);
199void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size);
200
201static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
202{
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;
208
209 while (size > 0) {
210 *d++ ^= *s++;
211 size -= sizeof(unsigned long);
212 }
213 } else {
214 __crypto_xor(dst, dst, src, size);
215 }
216}
217
218static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,
219 unsigned int size)
220{
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;
227
228 while (size > 0) {
229 *d++ = *s1++ ^ *s2++;
230 size -= sizeof(unsigned long);
231 }
232 } else {
233 __crypto_xor(dst, src1, src2, size);
234 }
235}
236
237int blkcipher_walk_done(struct blkcipher_desc *desc,
238 struct blkcipher_walk *walk, int err);
239int blkcipher_walk_virt(struct blkcipher_desc *desc,
240 struct blkcipher_walk *walk);
241int blkcipher_walk_phys(struct blkcipher_desc *desc,
242 struct blkcipher_walk *walk);
243int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
244 struct blkcipher_walk *walk,
245 unsigned int blocksize);
246int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
247 struct blkcipher_walk *walk,
248 struct crypto_aead *tfm,
249 unsigned int blocksize);
250
251int ablkcipher_walk_done(struct ablkcipher_request *req,
252 struct ablkcipher_walk *walk, int err);
253int ablkcipher_walk_phys(struct ablkcipher_request *req,
254 struct ablkcipher_walk *walk);
255void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
256
257static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
258{
259 return PTR_ALIGN(crypto_tfm_ctx(tfm),
260 crypto_tfm_alg_alignmask(tfm) + 1);
261}
262
263static inline struct crypto_instance *crypto_tfm_alg_instance(
264 struct crypto_tfm *tfm)
265{
266 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
267}
268
269static inline void *crypto_instance_ctx(struct crypto_instance *inst)
270{
271 return inst->__ctx;
272}
273
274static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
275 struct crypto_ablkcipher *tfm)
276{
277 return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
278}
279
280static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
281{
282 return crypto_tfm_ctx(&tfm->base);
283}
284
285static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
286{
287 return crypto_tfm_ctx_aligned(&tfm->base);
288}
289
290static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
291 struct crypto_spawn *spawn)
292{
293 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
294 u32 mask = CRYPTO_ALG_TYPE_MASK;
295
296 return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
297}
298
299static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
300{
301 return crypto_tfm_ctx(&tfm->base);
302}
303
304static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
305{
306 return crypto_tfm_ctx_aligned(&tfm->base);
307}
308
309static inline struct crypto_cipher *crypto_spawn_cipher(
310 struct crypto_spawn *spawn)
311{
312 u32 type = CRYPTO_ALG_TYPE_CIPHER;
313 u32 mask = CRYPTO_ALG_TYPE_MASK;
314
315 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
316}
317
318static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
319{
320 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
321}
322
323static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
324 struct scatterlist *dst,
325 struct scatterlist *src,
326 unsigned int nbytes)
327{
328 walk->in.sg = src;
329 walk->out.sg = dst;
330 walk->total = nbytes;
331}
332
333static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
334 struct scatterlist *dst,
335 struct scatterlist *src,
336 unsigned int nbytes)
337{
338 walk->in.sg = src;
339 walk->out.sg = dst;
340 walk->total = nbytes;
341 INIT_LIST_HEAD(&walk->buffers);
342}
343
344static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
345{
346 if (unlikely(!list_empty(&walk->buffers)))
347 __ablkcipher_walk_complete(walk);
348}
349
350static inline struct crypto_async_request *crypto_get_backlog(
351 struct crypto_queue *queue)
352{
353 return queue->backlog == &queue->list ? NULL :
354 container_of(queue->backlog, struct crypto_async_request, list);
355}
356
357static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
358 struct ablkcipher_request *request)
359{
360 return crypto_enqueue_request(queue, &request->base);
361}
362
363static inline struct ablkcipher_request *ablkcipher_dequeue_request(
364 struct crypto_queue *queue)
365{
366 return ablkcipher_request_cast(crypto_dequeue_request(queue));
367}
368
369static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
370{
371 return req->__ctx;
372}
373
374static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
375 struct crypto_ablkcipher *tfm)
376{
377 return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
378}
379
380static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
381 u32 type, u32 mask)
382{
383 return crypto_attr_alg(tb[1], type, mask);
384}
385
386static inline int crypto_requires_off(u32 type, u32 mask, u32 off)
387{
388 return (type ^ off) & mask & off;
389}
390
391/*
392 * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
393 * Otherwise returns zero.
394 */
395static inline int crypto_requires_sync(u32 type, u32 mask)
396{
397 return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);
398}
399
400noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
401
402/**
403 * crypto_memneq - Compare two areas of memory without leaking
404 * timing information.
405 *
406 * @a: One area of memory
407 * @b: Another area of memory
408 * @size: The size of the area.
409 *
410 * Returns 0 when data is equal, 1 otherwise.
411 */
412static inline int crypto_memneq(const void *a, const void *b, size_t size)
413{
414 return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
415}
416
417static inline void crypto_yield(u32 flags)
418{
419#if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY)
420 if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
421 cond_resched();
422#endif
423}
424
425int crypto_register_notifier(struct notifier_block *nb);
426int crypto_unregister_notifier(struct notifier_block *nb);
427
428/* Crypto notification events. */
429enum {
430 CRYPTO_MSG_ALG_REQUEST,
431 CRYPTO_MSG_ALG_REGISTER,
432 CRYPTO_MSG_ALG_LOADED,
433};
434
435#endif /* _CRYPTO_ALGAPI_H */