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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Symmetric key ciphers.
4 *
5 * Copyright (c) 2007-2015 Herbert Xu <[email protected]>
6 */
7
8#ifndef _CRYPTO_SKCIPHER_H
9#define _CRYPTO_SKCIPHER_H
10
11#include <linux/atomic.h>
12#include <linux/container_of.h>
13#include <linux/crypto.h>
14#include <linux/slab.h>
15#include <linux/string.h>
16#include <linux/types.h>
17
18/* Set this bit if the lskcipher operation is a continuation. */
19#define CRYPTO_LSKCIPHER_FLAG_CONT 0x00000001
20/* Set this bit if the lskcipher operation is final. */
21#define CRYPTO_LSKCIPHER_FLAG_FINAL 0x00000002
22/* The bit CRYPTO_TFM_REQ_MAY_SLEEP can also be set if needed. */
23
24/* Set this bit if the skcipher operation is a continuation. */
25#define CRYPTO_SKCIPHER_REQ_CONT 0x00000001
26/* Set this bit if the skcipher operation is not final. */
27#define CRYPTO_SKCIPHER_REQ_NOTFINAL 0x00000002
28
29struct scatterlist;
30
31/**
32 * struct skcipher_request - Symmetric key cipher request
33 * @cryptlen: Number of bytes to encrypt or decrypt
34 * @iv: Initialisation Vector
35 * @src: Source SG list
36 * @dst: Destination SG list
37 * @base: Underlying async request
38 * @__ctx: Start of private context data
39 */
40struct skcipher_request {
41 unsigned int cryptlen;
42
43 u8 *iv;
44
45 struct scatterlist *src;
46 struct scatterlist *dst;
47
48 struct crypto_async_request base;
49
50 void *__ctx[] CRYPTO_MINALIGN_ATTR;
51};
52
53struct crypto_skcipher {
54 unsigned int reqsize;
55
56 struct crypto_tfm base;
57};
58
59struct crypto_sync_skcipher {
60 struct crypto_skcipher base;
61};
62
63struct crypto_lskcipher {
64 struct crypto_tfm base;
65};
66
67/*
68 * struct skcipher_alg_common - common properties of skcipher_alg
69 * @min_keysize: Minimum key size supported by the transformation. This is the
70 * smallest key length supported by this transformation algorithm.
71 * This must be set to one of the pre-defined values as this is
72 * not hardware specific. Possible values for this field can be
73 * found via git grep "_MIN_KEY_SIZE" include/crypto/
74 * @max_keysize: Maximum key size supported by the transformation. This is the
75 * largest key length supported by this transformation algorithm.
76 * This must be set to one of the pre-defined values as this is
77 * not hardware specific. Possible values for this field can be
78 * found via git grep "_MAX_KEY_SIZE" include/crypto/
79 * @ivsize: IV size applicable for transformation. The consumer must provide an
80 * IV of exactly that size to perform the encrypt or decrypt operation.
81 * @chunksize: Equal to the block size except for stream ciphers such as
82 * CTR where it is set to the underlying block size.
83 * @statesize: Size of the internal state for the algorithm.
84 * @base: Definition of a generic crypto algorithm.
85 */
86#define SKCIPHER_ALG_COMMON { \
87 unsigned int min_keysize; \
88 unsigned int max_keysize; \
89 unsigned int ivsize; \
90 unsigned int chunksize; \
91 unsigned int statesize; \
92 \
93 struct crypto_alg base; \
94}
95struct skcipher_alg_common SKCIPHER_ALG_COMMON;
96
97/**
98 * struct skcipher_alg - symmetric key cipher definition
99 * @setkey: Set key for the transformation. This function is used to either
100 * program a supplied key into the hardware or store the key in the
101 * transformation context for programming it later. Note that this
102 * function does modify the transformation context. This function can
103 * be called multiple times during the existence of the transformation
104 * object, so one must make sure the key is properly reprogrammed into
105 * the hardware. This function is also responsible for checking the key
106 * length for validity. In case a software fallback was put in place in
107 * the @cra_init call, this function might need to use the fallback if
108 * the algorithm doesn't support all of the key sizes.
109 * @encrypt: Encrypt a scatterlist of blocks. This function is used to encrypt
110 * the supplied scatterlist containing the blocks of data. The crypto
111 * API consumer is responsible for aligning the entries of the
112 * scatterlist properly and making sure the chunks are correctly
113 * sized. In case a software fallback was put in place in the
114 * @cra_init call, this function might need to use the fallback if
115 * the algorithm doesn't support all of the key sizes. In case the
116 * key was stored in transformation context, the key might need to be
117 * re-programmed into the hardware in this function. This function
118 * shall not modify the transformation context, as this function may
119 * be called in parallel with the same transformation object.
120 * @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt
121 * and the conditions are exactly the same.
122 * @export: Export partial state of the transformation. This function dumps the
123 * entire state of the ongoing transformation into a provided block of
124 * data so it can be @import 'ed back later on. This is useful in case
125 * you want to save partial result of the transformation after
126 * processing certain amount of data and reload this partial result
127 * multiple times later on for multiple re-use. No data processing
128 * happens at this point.
129 * @import: Import partial state of the transformation. This function loads the
130 * entire state of the ongoing transformation from a provided block of
131 * data so the transformation can continue from this point onward. No
132 * data processing happens at this point.
133 * @init: Initialize the cryptographic transformation object. This function
134 * is used to initialize the cryptographic transformation object.
135 * This function is called only once at the instantiation time, right
136 * after the transformation context was allocated. In case the
137 * cryptographic hardware has some special requirements which need to
138 * be handled by software, this function shall check for the precise
139 * requirement of the transformation and put any software fallbacks
140 * in place.
141 * @exit: Deinitialize the cryptographic transformation object. This is a
142 * counterpart to @init, used to remove various changes set in
143 * @init.
144 * @walksize: Equal to the chunk size except in cases where the algorithm is
145 * considerably more efficient if it can operate on multiple chunks
146 * in parallel. Should be a multiple of chunksize.
147 * @co: see struct skcipher_alg_common
148 * @SKCIPHER_ALG_COMMON: see struct skcipher_alg_common
149 *
150 * All fields except @ivsize are mandatory and must be filled.
151 */
152struct skcipher_alg {
153 int (*setkey)(struct crypto_skcipher *tfm, const u8 *key,
154 unsigned int keylen);
155 int (*encrypt)(struct skcipher_request *req);
156 int (*decrypt)(struct skcipher_request *req);
157 int (*export)(struct skcipher_request *req, void *out);
158 int (*import)(struct skcipher_request *req, const void *in);
159 int (*init)(struct crypto_skcipher *tfm);
160 void (*exit)(struct crypto_skcipher *tfm);
161
162 unsigned int walksize;
163
164 union {
165 struct SKCIPHER_ALG_COMMON;
166 struct skcipher_alg_common co;
167 };
168};
169
170/**
171 * struct lskcipher_alg - linear symmetric key cipher definition
172 * @setkey: Set key for the transformation. This function is used to either
173 * program a supplied key into the hardware or store the key in the
174 * transformation context for programming it later. Note that this
175 * function does modify the transformation context. This function can
176 * be called multiple times during the existence of the transformation
177 * object, so one must make sure the key is properly reprogrammed into
178 * the hardware. This function is also responsible for checking the key
179 * length for validity. In case a software fallback was put in place in
180 * the @cra_init call, this function might need to use the fallback if
181 * the algorithm doesn't support all of the key sizes.
182 * @encrypt: Encrypt a number of bytes. This function is used to encrypt
183 * the supplied data. This function shall not modify
184 * the transformation context, as this function may be called
185 * in parallel with the same transformation object. Data
186 * may be left over if length is not a multiple of blocks
187 * and there is more to come (final == false). The number of
188 * left-over bytes should be returned in case of success.
189 * The siv field shall be as long as ivsize + statesize with
190 * the IV placed at the front. The state will be used by the
191 * algorithm internally.
192 * @decrypt: Decrypt a number of bytes. This is a reverse counterpart to
193 * @encrypt and the conditions are exactly the same.
194 * @init: Initialize the cryptographic transformation object. This function
195 * is used to initialize the cryptographic transformation object.
196 * This function is called only once at the instantiation time, right
197 * after the transformation context was allocated.
198 * @exit: Deinitialize the cryptographic transformation object. This is a
199 * counterpart to @init, used to remove various changes set in
200 * @init.
201 * @co: see struct skcipher_alg_common
202 */
203struct lskcipher_alg {
204 int (*setkey)(struct crypto_lskcipher *tfm, const u8 *key,
205 unsigned int keylen);
206 int (*encrypt)(struct crypto_lskcipher *tfm, const u8 *src,
207 u8 *dst, unsigned len, u8 *siv, u32 flags);
208 int (*decrypt)(struct crypto_lskcipher *tfm, const u8 *src,
209 u8 *dst, unsigned len, u8 *siv, u32 flags);
210 int (*init)(struct crypto_lskcipher *tfm);
211 void (*exit)(struct crypto_lskcipher *tfm);
212
213 struct skcipher_alg_common co;
214};
215
216#define MAX_SYNC_SKCIPHER_REQSIZE 384
217/*
218 * This performs a type-check against the "_tfm" argument to make sure
219 * all users have the correct skcipher tfm for doing on-stack requests.
220 */
221#define SYNC_SKCIPHER_REQUEST_ON_STACK(name, _tfm) \
222 char __##name##_desc[sizeof(struct skcipher_request) + \
223 MAX_SYNC_SKCIPHER_REQSIZE \
224 ] CRYPTO_MINALIGN_ATTR; \
225 struct skcipher_request *name = \
226 (((struct skcipher_request *)__##name##_desc)->base.tfm = \
227 crypto_sync_skcipher_tfm((_tfm)), \
228 (void *)__##name##_desc)
229
230/**
231 * DOC: Symmetric Key Cipher API
232 *
233 * Symmetric key cipher API is used with the ciphers of type
234 * CRYPTO_ALG_TYPE_SKCIPHER (listed as type "skcipher" in /proc/crypto).
235 *
236 * Asynchronous cipher operations imply that the function invocation for a
237 * cipher request returns immediately before the completion of the operation.
238 * The cipher request is scheduled as a separate kernel thread and therefore
239 * load-balanced on the different CPUs via the process scheduler. To allow
240 * the kernel crypto API to inform the caller about the completion of a cipher
241 * request, the caller must provide a callback function. That function is
242 * invoked with the cipher handle when the request completes.
243 *
244 * To support the asynchronous operation, additional information than just the
245 * cipher handle must be supplied to the kernel crypto API. That additional
246 * information is given by filling in the skcipher_request data structure.
247 *
248 * For the symmetric key cipher API, the state is maintained with the tfm
249 * cipher handle. A single tfm can be used across multiple calls and in
250 * parallel. For asynchronous block cipher calls, context data supplied and
251 * only used by the caller can be referenced the request data structure in
252 * addition to the IV used for the cipher request. The maintenance of such
253 * state information would be important for a crypto driver implementer to
254 * have, because when calling the callback function upon completion of the
255 * cipher operation, that callback function may need some information about
256 * which operation just finished if it invoked multiple in parallel. This
257 * state information is unused by the kernel crypto API.
258 */
259
260static inline struct crypto_skcipher *__crypto_skcipher_cast(
261 struct crypto_tfm *tfm)
262{
263 return container_of(tfm, struct crypto_skcipher, base);
264}
265
266/**
267 * crypto_alloc_skcipher() - allocate symmetric key cipher handle
268 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
269 * skcipher cipher
270 * @type: specifies the type of the cipher
271 * @mask: specifies the mask for the cipher
272 *
273 * Allocate a cipher handle for an skcipher. The returned struct
274 * crypto_skcipher is the cipher handle that is required for any subsequent
275 * API invocation for that skcipher.
276 *
277 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
278 * of an error, PTR_ERR() returns the error code.
279 */
280struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
281 u32 type, u32 mask);
282
283struct crypto_sync_skcipher *crypto_alloc_sync_skcipher(const char *alg_name,
284 u32 type, u32 mask);
285
286
287/**
288 * crypto_alloc_lskcipher() - allocate linear symmetric key cipher handle
289 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
290 * lskcipher
291 * @type: specifies the type of the cipher
292 * @mask: specifies the mask for the cipher
293 *
294 * Allocate a cipher handle for an lskcipher. The returned struct
295 * crypto_lskcipher is the cipher handle that is required for any subsequent
296 * API invocation for that lskcipher.
297 *
298 * Return: allocated cipher handle in case of success; IS_ERR() is true in case
299 * of an error, PTR_ERR() returns the error code.
300 */
301struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name,
302 u32 type, u32 mask);
303
304static inline struct crypto_tfm *crypto_skcipher_tfm(
305 struct crypto_skcipher *tfm)
306{
307 return &tfm->base;
308}
309
310static inline struct crypto_tfm *crypto_lskcipher_tfm(
311 struct crypto_lskcipher *tfm)
312{
313 return &tfm->base;
314}
315
316static inline struct crypto_tfm *crypto_sync_skcipher_tfm(
317 struct crypto_sync_skcipher *tfm)
318{
319 return crypto_skcipher_tfm(&tfm->base);
320}
321
322/**
323 * crypto_free_skcipher() - zeroize and free cipher handle
324 * @tfm: cipher handle to be freed
325 *
326 * If @tfm is a NULL or error pointer, this function does nothing.
327 */
328static inline void crypto_free_skcipher(struct crypto_skcipher *tfm)
329{
330 crypto_destroy_tfm(tfm, crypto_skcipher_tfm(tfm));
331}
332
333static inline void crypto_free_sync_skcipher(struct crypto_sync_skcipher *tfm)
334{
335 crypto_free_skcipher(&tfm->base);
336}
337
338/**
339 * crypto_free_lskcipher() - zeroize and free cipher handle
340 * @tfm: cipher handle to be freed
341 *
342 * If @tfm is a NULL or error pointer, this function does nothing.
343 */
344static inline void crypto_free_lskcipher(struct crypto_lskcipher *tfm)
345{
346 crypto_destroy_tfm(tfm, crypto_lskcipher_tfm(tfm));
347}
348
349/**
350 * crypto_has_skcipher() - Search for the availability of an skcipher.
351 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
352 * skcipher
353 * @type: specifies the type of the skcipher
354 * @mask: specifies the mask for the skcipher
355 *
356 * Return: true when the skcipher is known to the kernel crypto API; false
357 * otherwise
358 */
359int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask);
360
361static inline const char *crypto_skcipher_driver_name(
362 struct crypto_skcipher *tfm)
363{
364 return crypto_tfm_alg_driver_name(crypto_skcipher_tfm(tfm));
365}
366
367static inline const char *crypto_lskcipher_driver_name(
368 struct crypto_lskcipher *tfm)
369{
370 return crypto_tfm_alg_driver_name(crypto_lskcipher_tfm(tfm));
371}
372
373static inline struct skcipher_alg_common *crypto_skcipher_alg_common(
374 struct crypto_skcipher *tfm)
375{
376 return container_of(crypto_skcipher_tfm(tfm)->__crt_alg,
377 struct skcipher_alg_common, base);
378}
379
380static inline struct skcipher_alg *crypto_skcipher_alg(
381 struct crypto_skcipher *tfm)
382{
383 return container_of(crypto_skcipher_tfm(tfm)->__crt_alg,
384 struct skcipher_alg, base);
385}
386
387static inline struct lskcipher_alg *crypto_lskcipher_alg(
388 struct crypto_lskcipher *tfm)
389{
390 return container_of(crypto_lskcipher_tfm(tfm)->__crt_alg,
391 struct lskcipher_alg, co.base);
392}
393
394/**
395 * crypto_skcipher_ivsize() - obtain IV size
396 * @tfm: cipher handle
397 *
398 * The size of the IV for the skcipher referenced by the cipher handle is
399 * returned. This IV size may be zero if the cipher does not need an IV.
400 *
401 * Return: IV size in bytes
402 */
403static inline unsigned int crypto_skcipher_ivsize(struct crypto_skcipher *tfm)
404{
405 return crypto_skcipher_alg_common(tfm)->ivsize;
406}
407
408static inline unsigned int crypto_sync_skcipher_ivsize(
409 struct crypto_sync_skcipher *tfm)
410{
411 return crypto_skcipher_ivsize(&tfm->base);
412}
413
414/**
415 * crypto_lskcipher_ivsize() - obtain IV size
416 * @tfm: cipher handle
417 *
418 * The size of the IV for the lskcipher referenced by the cipher handle is
419 * returned. This IV size may be zero if the cipher does not need an IV.
420 *
421 * Return: IV size in bytes
422 */
423static inline unsigned int crypto_lskcipher_ivsize(
424 struct crypto_lskcipher *tfm)
425{
426 return crypto_lskcipher_alg(tfm)->co.ivsize;
427}
428
429/**
430 * crypto_skcipher_blocksize() - obtain block size of cipher
431 * @tfm: cipher handle
432 *
433 * The block size for the skcipher referenced with the cipher handle is
434 * returned. The caller may use that information to allocate appropriate
435 * memory for the data returned by the encryption or decryption operation
436 *
437 * Return: block size of cipher
438 */
439static inline unsigned int crypto_skcipher_blocksize(
440 struct crypto_skcipher *tfm)
441{
442 return crypto_tfm_alg_blocksize(crypto_skcipher_tfm(tfm));
443}
444
445/**
446 * crypto_lskcipher_blocksize() - obtain block size of cipher
447 * @tfm: cipher handle
448 *
449 * The block size for the lskcipher referenced with the cipher handle is
450 * returned. The caller may use that information to allocate appropriate
451 * memory for the data returned by the encryption or decryption operation
452 *
453 * Return: block size of cipher
454 */
455static inline unsigned int crypto_lskcipher_blocksize(
456 struct crypto_lskcipher *tfm)
457{
458 return crypto_tfm_alg_blocksize(crypto_lskcipher_tfm(tfm));
459}
460
461/**
462 * crypto_skcipher_chunksize() - obtain chunk size
463 * @tfm: cipher handle
464 *
465 * The block size is set to one for ciphers such as CTR. However,
466 * you still need to provide incremental updates in multiples of
467 * the underlying block size as the IV does not have sub-block
468 * granularity. This is known in this API as the chunk size.
469 *
470 * Return: chunk size in bytes
471 */
472static inline unsigned int crypto_skcipher_chunksize(
473 struct crypto_skcipher *tfm)
474{
475 return crypto_skcipher_alg_common(tfm)->chunksize;
476}
477
478/**
479 * crypto_lskcipher_chunksize() - obtain chunk size
480 * @tfm: cipher handle
481 *
482 * The block size is set to one for ciphers such as CTR. However,
483 * you still need to provide incremental updates in multiples of
484 * the underlying block size as the IV does not have sub-block
485 * granularity. This is known in this API as the chunk size.
486 *
487 * Return: chunk size in bytes
488 */
489static inline unsigned int crypto_lskcipher_chunksize(
490 struct crypto_lskcipher *tfm)
491{
492 return crypto_lskcipher_alg(tfm)->co.chunksize;
493}
494
495/**
496 * crypto_skcipher_statesize() - obtain state size
497 * @tfm: cipher handle
498 *
499 * Some algorithms cannot be chained with the IV alone. They carry
500 * internal state which must be replicated if data is to be processed
501 * incrementally. The size of that state can be obtained with this
502 * function.
503 *
504 * Return: state size in bytes
505 */
506static inline unsigned int crypto_skcipher_statesize(
507 struct crypto_skcipher *tfm)
508{
509 return crypto_skcipher_alg_common(tfm)->statesize;
510}
511
512/**
513 * crypto_lskcipher_statesize() - obtain state size
514 * @tfm: cipher handle
515 *
516 * Some algorithms cannot be chained with the IV alone. They carry
517 * internal state which must be replicated if data is to be processed
518 * incrementally. The size of that state can be obtained with this
519 * function.
520 *
521 * Return: state size in bytes
522 */
523static inline unsigned int crypto_lskcipher_statesize(
524 struct crypto_lskcipher *tfm)
525{
526 return crypto_lskcipher_alg(tfm)->co.statesize;
527}
528
529static inline unsigned int crypto_sync_skcipher_blocksize(
530 struct crypto_sync_skcipher *tfm)
531{
532 return crypto_skcipher_blocksize(&tfm->base);
533}
534
535static inline unsigned int crypto_skcipher_alignmask(
536 struct crypto_skcipher *tfm)
537{
538 return crypto_tfm_alg_alignmask(crypto_skcipher_tfm(tfm));
539}
540
541static inline unsigned int crypto_lskcipher_alignmask(
542 struct crypto_lskcipher *tfm)
543{
544 return crypto_tfm_alg_alignmask(crypto_lskcipher_tfm(tfm));
545}
546
547static inline u32 crypto_skcipher_get_flags(struct crypto_skcipher *tfm)
548{
549 return crypto_tfm_get_flags(crypto_skcipher_tfm(tfm));
550}
551
552static inline void crypto_skcipher_set_flags(struct crypto_skcipher *tfm,
553 u32 flags)
554{
555 crypto_tfm_set_flags(crypto_skcipher_tfm(tfm), flags);
556}
557
558static inline void crypto_skcipher_clear_flags(struct crypto_skcipher *tfm,
559 u32 flags)
560{
561 crypto_tfm_clear_flags(crypto_skcipher_tfm(tfm), flags);
562}
563
564static inline u32 crypto_sync_skcipher_get_flags(
565 struct crypto_sync_skcipher *tfm)
566{
567 return crypto_skcipher_get_flags(&tfm->base);
568}
569
570static inline void crypto_sync_skcipher_set_flags(
571 struct crypto_sync_skcipher *tfm, u32 flags)
572{
573 crypto_skcipher_set_flags(&tfm->base, flags);
574}
575
576static inline void crypto_sync_skcipher_clear_flags(
577 struct crypto_sync_skcipher *tfm, u32 flags)
578{
579 crypto_skcipher_clear_flags(&tfm->base, flags);
580}
581
582static inline u32 crypto_lskcipher_get_flags(struct crypto_lskcipher *tfm)
583{
584 return crypto_tfm_get_flags(crypto_lskcipher_tfm(tfm));
585}
586
587static inline void crypto_lskcipher_set_flags(struct crypto_lskcipher *tfm,
588 u32 flags)
589{
590 crypto_tfm_set_flags(crypto_lskcipher_tfm(tfm), flags);
591}
592
593static inline void crypto_lskcipher_clear_flags(struct crypto_lskcipher *tfm,
594 u32 flags)
595{
596 crypto_tfm_clear_flags(crypto_lskcipher_tfm(tfm), flags);
597}
598
599/**
600 * crypto_skcipher_setkey() - set key for cipher
601 * @tfm: cipher handle
602 * @key: buffer holding the key
603 * @keylen: length of the key in bytes
604 *
605 * The caller provided key is set for the skcipher referenced by the cipher
606 * handle.
607 *
608 * Note, the key length determines the cipher type. Many block ciphers implement
609 * different cipher modes depending on the key size, such as AES-128 vs AES-192
610 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
611 * is performed.
612 *
613 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
614 */
615int crypto_skcipher_setkey(struct crypto_skcipher *tfm,
616 const u8 *key, unsigned int keylen);
617
618static inline int crypto_sync_skcipher_setkey(struct crypto_sync_skcipher *tfm,
619 const u8 *key, unsigned int keylen)
620{
621 return crypto_skcipher_setkey(&tfm->base, key, keylen);
622}
623
624/**
625 * crypto_lskcipher_setkey() - set key for cipher
626 * @tfm: cipher handle
627 * @key: buffer holding the key
628 * @keylen: length of the key in bytes
629 *
630 * The caller provided key is set for the lskcipher referenced by the cipher
631 * handle.
632 *
633 * Note, the key length determines the cipher type. Many block ciphers implement
634 * different cipher modes depending on the key size, such as AES-128 vs AES-192
635 * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128
636 * is performed.
637 *
638 * Return: 0 if the setting of the key was successful; < 0 if an error occurred
639 */
640int crypto_lskcipher_setkey(struct crypto_lskcipher *tfm,
641 const u8 *key, unsigned int keylen);
642
643static inline unsigned int crypto_skcipher_min_keysize(
644 struct crypto_skcipher *tfm)
645{
646 return crypto_skcipher_alg_common(tfm)->min_keysize;
647}
648
649static inline unsigned int crypto_skcipher_max_keysize(
650 struct crypto_skcipher *tfm)
651{
652 return crypto_skcipher_alg_common(tfm)->max_keysize;
653}
654
655static inline unsigned int crypto_lskcipher_min_keysize(
656 struct crypto_lskcipher *tfm)
657{
658 return crypto_lskcipher_alg(tfm)->co.min_keysize;
659}
660
661static inline unsigned int crypto_lskcipher_max_keysize(
662 struct crypto_lskcipher *tfm)
663{
664 return crypto_lskcipher_alg(tfm)->co.max_keysize;
665}
666
667/**
668 * crypto_skcipher_reqtfm() - obtain cipher handle from request
669 * @req: skcipher_request out of which the cipher handle is to be obtained
670 *
671 * Return the crypto_skcipher handle when furnishing an skcipher_request
672 * data structure.
673 *
674 * Return: crypto_skcipher handle
675 */
676static inline struct crypto_skcipher *crypto_skcipher_reqtfm(
677 struct skcipher_request *req)
678{
679 return __crypto_skcipher_cast(req->base.tfm);
680}
681
682static inline struct crypto_sync_skcipher *crypto_sync_skcipher_reqtfm(
683 struct skcipher_request *req)
684{
685 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
686
687 return container_of(tfm, struct crypto_sync_skcipher, base);
688}
689
690/**
691 * crypto_skcipher_encrypt() - encrypt plaintext
692 * @req: reference to the skcipher_request handle that holds all information
693 * needed to perform the cipher operation
694 *
695 * Encrypt plaintext data using the skcipher_request handle. That data
696 * structure and how it is filled with data is discussed with the
697 * skcipher_request_* functions.
698 *
699 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
700 */
701int crypto_skcipher_encrypt(struct skcipher_request *req);
702
703/**
704 * crypto_skcipher_decrypt() - decrypt ciphertext
705 * @req: reference to the skcipher_request handle that holds all information
706 * needed to perform the cipher operation
707 *
708 * Decrypt ciphertext data using the skcipher_request handle. That data
709 * structure and how it is filled with data is discussed with the
710 * skcipher_request_* functions.
711 *
712 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
713 */
714int crypto_skcipher_decrypt(struct skcipher_request *req);
715
716/**
717 * crypto_skcipher_export() - export partial state
718 * @req: reference to the skcipher_request handle that holds all information
719 * needed to perform the operation
720 * @out: output buffer of sufficient size that can hold the state
721 *
722 * Export partial state of the transformation. This function dumps the
723 * entire state of the ongoing transformation into a provided block of
724 * data so it can be @import 'ed back later on. This is useful in case
725 * you want to save partial result of the transformation after
726 * processing certain amount of data and reload this partial result
727 * multiple times later on for multiple re-use. No data processing
728 * happens at this point.
729 *
730 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
731 */
732int crypto_skcipher_export(struct skcipher_request *req, void *out);
733
734/**
735 * crypto_skcipher_import() - import partial state
736 * @req: reference to the skcipher_request handle that holds all information
737 * needed to perform the operation
738 * @in: buffer holding the state
739 *
740 * Import partial state of the transformation. This function loads the
741 * entire state of the ongoing transformation from a provided block of
742 * data so the transformation can continue from this point onward. No
743 * data processing happens at this point.
744 *
745 * Return: 0 if the cipher operation was successful; < 0 if an error occurred
746 */
747int crypto_skcipher_import(struct skcipher_request *req, const void *in);
748
749/**
750 * crypto_lskcipher_encrypt() - encrypt plaintext
751 * @tfm: lskcipher handle
752 * @src: source buffer
753 * @dst: destination buffer
754 * @len: number of bytes to process
755 * @siv: IV + state for the cipher operation. The length of the IV must
756 * comply with the IV size defined by crypto_lskcipher_ivsize. The
757 * IV is then followed with a buffer with the length as specified by
758 * crypto_lskcipher_statesize.
759 * Encrypt plaintext data using the lskcipher handle.
760 *
761 * Return: >=0 if the cipher operation was successful, if positive
762 * then this many bytes have been left unprocessed;
763 * < 0 if an error occurred
764 */
765int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src,
766 u8 *dst, unsigned len, u8 *siv);
767
768/**
769 * crypto_lskcipher_decrypt() - decrypt ciphertext
770 * @tfm: lskcipher handle
771 * @src: source buffer
772 * @dst: destination buffer
773 * @len: number of bytes to process
774 * @siv: IV + state for the cipher operation. The length of the IV must
775 * comply with the IV size defined by crypto_lskcipher_ivsize. The
776 * IV is then followed with a buffer with the length as specified by
777 * crypto_lskcipher_statesize.
778 *
779 * Decrypt ciphertext data using the lskcipher handle.
780 *
781 * Return: >=0 if the cipher operation was successful, if positive
782 * then this many bytes have been left unprocessed;
783 * < 0 if an error occurred
784 */
785int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src,
786 u8 *dst, unsigned len, u8 *siv);
787
788/**
789 * DOC: Symmetric Key Cipher Request Handle
790 *
791 * The skcipher_request data structure contains all pointers to data
792 * required for the symmetric key cipher operation. This includes the cipher
793 * handle (which can be used by multiple skcipher_request instances), pointer
794 * to plaintext and ciphertext, asynchronous callback function, etc. It acts
795 * as a handle to the skcipher_request_* API calls in a similar way as
796 * skcipher handle to the crypto_skcipher_* API calls.
797 */
798
799/**
800 * crypto_skcipher_reqsize() - obtain size of the request data structure
801 * @tfm: cipher handle
802 *
803 * Return: number of bytes
804 */
805static inline unsigned int crypto_skcipher_reqsize(struct crypto_skcipher *tfm)
806{
807 return tfm->reqsize;
808}
809
810/**
811 * skcipher_request_set_tfm() - update cipher handle reference in request
812 * @req: request handle to be modified
813 * @tfm: cipher handle that shall be added to the request handle
814 *
815 * Allow the caller to replace the existing skcipher handle in the request
816 * data structure with a different one.
817 */
818static inline void skcipher_request_set_tfm(struct skcipher_request *req,
819 struct crypto_skcipher *tfm)
820{
821 req->base.tfm = crypto_skcipher_tfm(tfm);
822}
823
824static inline void skcipher_request_set_sync_tfm(struct skcipher_request *req,
825 struct crypto_sync_skcipher *tfm)
826{
827 skcipher_request_set_tfm(req, &tfm->base);
828}
829
830static inline struct skcipher_request *skcipher_request_cast(
831 struct crypto_async_request *req)
832{
833 return container_of(req, struct skcipher_request, base);
834}
835
836/**
837 * skcipher_request_alloc() - allocate request data structure
838 * @tfm: cipher handle to be registered with the request
839 * @gfp: memory allocation flag that is handed to kmalloc by the API call.
840 *
841 * Allocate the request data structure that must be used with the skcipher
842 * encrypt and decrypt API calls. During the allocation, the provided skcipher
843 * handle is registered in the request data structure.
844 *
845 * Return: allocated request handle in case of success, or NULL if out of memory
846 */
847static inline struct skcipher_request *skcipher_request_alloc_noprof(
848 struct crypto_skcipher *tfm, gfp_t gfp)
849{
850 struct skcipher_request *req;
851
852 req = kmalloc_noprof(sizeof(struct skcipher_request) +
853 crypto_skcipher_reqsize(tfm), gfp);
854
855 if (likely(req))
856 skcipher_request_set_tfm(req, tfm);
857
858 return req;
859}
860#define skcipher_request_alloc(...) alloc_hooks(skcipher_request_alloc_noprof(__VA_ARGS__))
861
862/**
863 * skcipher_request_free() - zeroize and free request data structure
864 * @req: request data structure cipher handle to be freed
865 */
866static inline void skcipher_request_free(struct skcipher_request *req)
867{
868 kfree_sensitive(req);
869}
870
871static inline void skcipher_request_zero(struct skcipher_request *req)
872{
873 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
874
875 memzero_explicit(req, sizeof(*req) + crypto_skcipher_reqsize(tfm));
876}
877
878/**
879 * skcipher_request_set_callback() - set asynchronous callback function
880 * @req: request handle
881 * @flags: specify zero or an ORing of the flags
882 * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and
883 * increase the wait queue beyond the initial maximum size;
884 * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep
885 * @compl: callback function pointer to be registered with the request handle
886 * @data: The data pointer refers to memory that is not used by the kernel
887 * crypto API, but provided to the callback function for it to use. Here,
888 * the caller can provide a reference to memory the callback function can
889 * operate on. As the callback function is invoked asynchronously to the
890 * related functionality, it may need to access data structures of the
891 * related functionality which can be referenced using this pointer. The
892 * callback function can access the memory via the "data" field in the
893 * crypto_async_request data structure provided to the callback function.
894 *
895 * This function allows setting the callback function that is triggered once the
896 * cipher operation completes.
897 *
898 * The callback function is registered with the skcipher_request handle and
899 * must comply with the following template::
900 *
901 * void callback_function(struct crypto_async_request *req, int error)
902 */
903static inline void skcipher_request_set_callback(struct skcipher_request *req,
904 u32 flags,
905 crypto_completion_t compl,
906 void *data)
907{
908 req->base.complete = compl;
909 req->base.data = data;
910 req->base.flags = flags;
911}
912
913/**
914 * skcipher_request_set_crypt() - set data buffers
915 * @req: request handle
916 * @src: source scatter / gather list
917 * @dst: destination scatter / gather list
918 * @cryptlen: number of bytes to process from @src
919 * @iv: IV for the cipher operation which must comply with the IV size defined
920 * by crypto_skcipher_ivsize
921 *
922 * This function allows setting of the source data and destination data
923 * scatter / gather lists.
924 *
925 * For encryption, the source is treated as the plaintext and the
926 * destination is the ciphertext. For a decryption operation, the use is
927 * reversed - the source is the ciphertext and the destination is the plaintext.
928 */
929static inline void skcipher_request_set_crypt(
930 struct skcipher_request *req,
931 struct scatterlist *src, struct scatterlist *dst,
932 unsigned int cryptlen, void *iv)
933{
934 req->src = src;
935 req->dst = dst;
936 req->cryptlen = cryptlen;
937 req->iv = iv;
938}
939
940#endif /* _CRYPTO_SKCIPHER_H */
941