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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
61da88e2 HX |
2 | /* |
3 | * Symmetric key ciphers. | |
4 | * | |
7a7ffe65 | 5 | * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> |
61da88e2 HX |
6 | */ |
7 | ||
8 | #ifndef _CRYPTO_SKCIPHER_H | |
9 | #define _CRYPTO_SKCIPHER_H | |
10 | ||
11 | #include <linux/crypto.h> | |
03bf712f HX |
12 | #include <linux/kernel.h> |
13 | #include <linux/slab.h> | |
61da88e2 | 14 | |
7a7ffe65 HX |
15 | /** |
16 | * struct skcipher_request - Symmetric key cipher request | |
17 | * @cryptlen: Number of bytes to encrypt or decrypt | |
18 | * @iv: Initialisation Vector | |
19 | * @src: Source SG list | |
20 | * @dst: Destination SG list | |
dd3240a2 | 21 | * @base: Underlying async request |
7a7ffe65 HX |
22 | * @__ctx: Start of private context data |
23 | */ | |
24 | struct skcipher_request { | |
25 | unsigned int cryptlen; | |
26 | ||
27 | u8 *iv; | |
28 | ||
29 | struct scatterlist *src; | |
30 | struct scatterlist *dst; | |
31 | ||
32 | struct crypto_async_request base; | |
33 | ||
34 | void *__ctx[] CRYPTO_MINALIGN_ATTR; | |
35 | }; | |
36 | ||
7a7ffe65 | 37 | struct crypto_skcipher { |
7a7ffe65 | 38 | unsigned int reqsize; |
a1383cd8 | 39 | |
7a7ffe65 HX |
40 | struct crypto_tfm base; |
41 | }; | |
42 | ||
b350bee5 KC |
43 | struct crypto_sync_skcipher { |
44 | struct crypto_skcipher base; | |
45 | }; | |
46 | ||
4e6c3df4 HX |
47 | /** |
48 | * struct skcipher_alg - symmetric key cipher definition | |
49 | * @min_keysize: Minimum key size supported by the transformation. This is the | |
50 | * smallest key length supported by this transformation algorithm. | |
51 | * This must be set to one of the pre-defined values as this is | |
52 | * not hardware specific. Possible values for this field can be | |
53 | * found via git grep "_MIN_KEY_SIZE" include/crypto/ | |
54 | * @max_keysize: Maximum key size supported by the transformation. This is the | |
55 | * largest key length supported by this transformation algorithm. | |
56 | * This must be set to one of the pre-defined values as this is | |
57 | * not hardware specific. Possible values for this field can be | |
58 | * found via git grep "_MAX_KEY_SIZE" include/crypto/ | |
59 | * @setkey: Set key for the transformation. This function is used to either | |
60 | * program a supplied key into the hardware or store the key in the | |
61 | * transformation context for programming it later. Note that this | |
62 | * function does modify the transformation context. This function can | |
63 | * be called multiple times during the existence of the transformation | |
64 | * object, so one must make sure the key is properly reprogrammed into | |
65 | * the hardware. This function is also responsible for checking the key | |
66 | * length for validity. In case a software fallback was put in place in | |
67 | * the @cra_init call, this function might need to use the fallback if | |
68 | * the algorithm doesn't support all of the key sizes. | |
69 | * @encrypt: Encrypt a scatterlist of blocks. This function is used to encrypt | |
70 | * the supplied scatterlist containing the blocks of data. The crypto | |
71 | * API consumer is responsible for aligning the entries of the | |
72 | * scatterlist properly and making sure the chunks are correctly | |
73 | * sized. In case a software fallback was put in place in the | |
74 | * @cra_init call, this function might need to use the fallback if | |
75 | * the algorithm doesn't support all of the key sizes. In case the | |
76 | * key was stored in transformation context, the key might need to be | |
77 | * re-programmed into the hardware in this function. This function | |
78 | * shall not modify the transformation context, as this function may | |
79 | * be called in parallel with the same transformation object. | |
80 | * @decrypt: Decrypt a single block. This is a reverse counterpart to @encrypt | |
81 | * and the conditions are exactly the same. | |
82 | * @init: Initialize the cryptographic transformation object. This function | |
83 | * is used to initialize the cryptographic transformation object. | |
84 | * This function is called only once at the instantiation time, right | |
85 | * after the transformation context was allocated. In case the | |
86 | * cryptographic hardware has some special requirements which need to | |
87 | * be handled by software, this function shall check for the precise | |
88 | * requirement of the transformation and put any software fallbacks | |
89 | * in place. | |
90 | * @exit: Deinitialize the cryptographic transformation object. This is a | |
91 | * counterpart to @init, used to remove various changes set in | |
92 | * @init. | |
93 | * @ivsize: IV size applicable for transformation. The consumer must provide an | |
94 | * IV of exactly that size to perform the encrypt or decrypt operation. | |
95 | * @chunksize: Equal to the block size except for stream ciphers such as | |
96 | * CTR where it is set to the underlying block size. | |
c821f6ab AB |
97 | * @walksize: Equal to the chunk size except in cases where the algorithm is |
98 | * considerably more efficient if it can operate on multiple chunks | |
99 | * in parallel. Should be a multiple of chunksize. | |
5c562338 | 100 | * @base: Definition of a generic crypto algorithm. |
4e6c3df4 HX |
101 | * |
102 | * All fields except @ivsize are mandatory and must be filled. | |
103 | */ | |
104 | struct skcipher_alg { | |
105 | int (*setkey)(struct crypto_skcipher *tfm, const u8 *key, | |
106 | unsigned int keylen); | |
107 | int (*encrypt)(struct skcipher_request *req); | |
108 | int (*decrypt)(struct skcipher_request *req); | |
109 | int (*init)(struct crypto_skcipher *tfm); | |
110 | void (*exit)(struct crypto_skcipher *tfm); | |
111 | ||
112 | unsigned int min_keysize; | |
113 | unsigned int max_keysize; | |
114 | unsigned int ivsize; | |
115 | unsigned int chunksize; | |
c821f6ab | 116 | unsigned int walksize; |
4e6c3df4 HX |
117 | |
118 | struct crypto_alg base; | |
119 | }; | |
120 | ||
b350bee5 KC |
121 | #define MAX_SYNC_SKCIPHER_REQSIZE 384 |
122 | /* | |
123 | * This performs a type-check against the "tfm" argument to make sure | |
124 | * all users have the correct skcipher tfm for doing on-stack requests. | |
125 | */ | |
126 | #define SYNC_SKCIPHER_REQUEST_ON_STACK(name, tfm) \ | |
127 | char __##name##_desc[sizeof(struct skcipher_request) + \ | |
128 | MAX_SYNC_SKCIPHER_REQSIZE + \ | |
129 | (!(sizeof((struct crypto_sync_skcipher *)1 == \ | |
130 | (typeof(tfm))1))) \ | |
131 | ] CRYPTO_MINALIGN_ATTR; \ | |
132 | struct skcipher_request *name = (void *)__##name##_desc | |
133 | ||
7a7ffe65 HX |
134 | /** |
135 | * DOC: Symmetric Key Cipher API | |
136 | * | |
137 | * Symmetric key cipher API is used with the ciphers of type | |
138 | * CRYPTO_ALG_TYPE_SKCIPHER (listed as type "skcipher" in /proc/crypto). | |
139 | * | |
140 | * Asynchronous cipher operations imply that the function invocation for a | |
141 | * cipher request returns immediately before the completion of the operation. | |
142 | * The cipher request is scheduled as a separate kernel thread and therefore | |
143 | * load-balanced on the different CPUs via the process scheduler. To allow | |
144 | * the kernel crypto API to inform the caller about the completion of a cipher | |
145 | * request, the caller must provide a callback function. That function is | |
146 | * invoked with the cipher handle when the request completes. | |
147 | * | |
148 | * To support the asynchronous operation, additional information than just the | |
149 | * cipher handle must be supplied to the kernel crypto API. That additional | |
150 | * information is given by filling in the skcipher_request data structure. | |
151 | * | |
152 | * For the symmetric key cipher API, the state is maintained with the tfm | |
153 | * cipher handle. A single tfm can be used across multiple calls and in | |
154 | * parallel. For asynchronous block cipher calls, context data supplied and | |
155 | * only used by the caller can be referenced the request data structure in | |
156 | * addition to the IV used for the cipher request. The maintenance of such | |
157 | * state information would be important for a crypto driver implementer to | |
158 | * have, because when calling the callback function upon completion of the | |
159 | * cipher operation, that callback function may need some information about | |
160 | * which operation just finished if it invoked multiple in parallel. This | |
161 | * state information is unused by the kernel crypto API. | |
162 | */ | |
163 | ||
164 | static inline struct crypto_skcipher *__crypto_skcipher_cast( | |
165 | struct crypto_tfm *tfm) | |
166 | { | |
167 | return container_of(tfm, struct crypto_skcipher, base); | |
168 | } | |
169 | ||
170 | /** | |
171 | * crypto_alloc_skcipher() - allocate symmetric key cipher handle | |
172 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
173 | * skcipher cipher | |
174 | * @type: specifies the type of the cipher | |
175 | * @mask: specifies the mask for the cipher | |
176 | * | |
177 | * Allocate a cipher handle for an skcipher. The returned struct | |
178 | * crypto_skcipher is the cipher handle that is required for any subsequent | |
179 | * API invocation for that skcipher. | |
180 | * | |
181 | * Return: allocated cipher handle in case of success; IS_ERR() is true in case | |
182 | * of an error, PTR_ERR() returns the error code. | |
183 | */ | |
184 | struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, | |
185 | u32 type, u32 mask); | |
186 | ||
b350bee5 KC |
187 | struct crypto_sync_skcipher *crypto_alloc_sync_skcipher(const char *alg_name, |
188 | u32 type, u32 mask); | |
189 | ||
7a7ffe65 HX |
190 | static inline struct crypto_tfm *crypto_skcipher_tfm( |
191 | struct crypto_skcipher *tfm) | |
192 | { | |
193 | return &tfm->base; | |
194 | } | |
195 | ||
196 | /** | |
197 | * crypto_free_skcipher() - zeroize and free cipher handle | |
198 | * @tfm: cipher handle to be freed | |
199 | */ | |
200 | static inline void crypto_free_skcipher(struct crypto_skcipher *tfm) | |
201 | { | |
202 | crypto_destroy_tfm(tfm, crypto_skcipher_tfm(tfm)); | |
203 | } | |
204 | ||
b350bee5 KC |
205 | static inline void crypto_free_sync_skcipher(struct crypto_sync_skcipher *tfm) |
206 | { | |
207 | crypto_free_skcipher(&tfm->base); | |
208 | } | |
209 | ||
7a7ffe65 HX |
210 | /** |
211 | * crypto_has_skcipher() - Search for the availability of an skcipher. | |
212 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
213 | * skcipher | |
4e6c3df4 HX |
214 | * @type: specifies the type of the skcipher |
215 | * @mask: specifies the mask for the skcipher | |
216 | * | |
217 | * Return: true when the skcipher is known to the kernel crypto API; false | |
218 | * otherwise | |
219 | */ | |
d3ca75a8 | 220 | int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask); |
4e6c3df4 | 221 | |
a2d382a4 HX |
222 | static inline const char *crypto_skcipher_driver_name( |
223 | struct crypto_skcipher *tfm) | |
224 | { | |
92b3cad3 | 225 | return crypto_tfm_alg_driver_name(crypto_skcipher_tfm(tfm)); |
a2d382a4 HX |
226 | } |
227 | ||
4e6c3df4 HX |
228 | static inline struct skcipher_alg *crypto_skcipher_alg( |
229 | struct crypto_skcipher *tfm) | |
230 | { | |
231 | return container_of(crypto_skcipher_tfm(tfm)->__crt_alg, | |
232 | struct skcipher_alg, base); | |
233 | } | |
234 | ||
235 | static inline unsigned int crypto_skcipher_alg_ivsize(struct skcipher_alg *alg) | |
236 | { | |
4e6c3df4 HX |
237 | return alg->ivsize; |
238 | } | |
239 | ||
7a7ffe65 HX |
240 | /** |
241 | * crypto_skcipher_ivsize() - obtain IV size | |
242 | * @tfm: cipher handle | |
243 | * | |
244 | * The size of the IV for the skcipher referenced by the cipher handle is | |
245 | * returned. This IV size may be zero if the cipher does not need an IV. | |
246 | * | |
247 | * Return: IV size in bytes | |
248 | */ | |
249 | static inline unsigned int crypto_skcipher_ivsize(struct crypto_skcipher *tfm) | |
250 | { | |
140734d3 | 251 | return crypto_skcipher_alg(tfm)->ivsize; |
7a7ffe65 HX |
252 | } |
253 | ||
b350bee5 KC |
254 | static inline unsigned int crypto_sync_skcipher_ivsize( |
255 | struct crypto_sync_skcipher *tfm) | |
256 | { | |
257 | return crypto_skcipher_ivsize(&tfm->base); | |
258 | } | |
259 | ||
7a7ffe65 HX |
260 | /** |
261 | * crypto_skcipher_blocksize() - obtain block size of cipher | |
262 | * @tfm: cipher handle | |
263 | * | |
264 | * The block size for the skcipher referenced with the cipher handle is | |
265 | * returned. The caller may use that information to allocate appropriate | |
266 | * memory for the data returned by the encryption or decryption operation | |
267 | * | |
268 | * Return: block size of cipher | |
269 | */ | |
270 | static inline unsigned int crypto_skcipher_blocksize( | |
271 | struct crypto_skcipher *tfm) | |
272 | { | |
273 | return crypto_tfm_alg_blocksize(crypto_skcipher_tfm(tfm)); | |
274 | } | |
275 | ||
5b0fe955 HX |
276 | static inline unsigned int crypto_skcipher_alg_chunksize( |
277 | struct skcipher_alg *alg) | |
278 | { | |
5b0fe955 HX |
279 | return alg->chunksize; |
280 | } | |
281 | ||
282 | /** | |
283 | * crypto_skcipher_chunksize() - obtain chunk size | |
284 | * @tfm: cipher handle | |
285 | * | |
286 | * The block size is set to one for ciphers such as CTR. However, | |
287 | * you still need to provide incremental updates in multiples of | |
288 | * the underlying block size as the IV does not have sub-block | |
289 | * granularity. This is known in this API as the chunk size. | |
290 | * | |
291 | * Return: chunk size in bytes | |
292 | */ | |
293 | static inline unsigned int crypto_skcipher_chunksize( | |
294 | struct crypto_skcipher *tfm) | |
295 | { | |
296 | return crypto_skcipher_alg_chunksize(crypto_skcipher_alg(tfm)); | |
297 | } | |
298 | ||
b350bee5 KC |
299 | static inline unsigned int crypto_sync_skcipher_blocksize( |
300 | struct crypto_sync_skcipher *tfm) | |
301 | { | |
302 | return crypto_skcipher_blocksize(&tfm->base); | |
303 | } | |
304 | ||
7a7ffe65 HX |
305 | static inline unsigned int crypto_skcipher_alignmask( |
306 | struct crypto_skcipher *tfm) | |
307 | { | |
308 | return crypto_tfm_alg_alignmask(crypto_skcipher_tfm(tfm)); | |
309 | } | |
310 | ||
311 | static inline u32 crypto_skcipher_get_flags(struct crypto_skcipher *tfm) | |
312 | { | |
313 | return crypto_tfm_get_flags(crypto_skcipher_tfm(tfm)); | |
314 | } | |
315 | ||
316 | static inline void crypto_skcipher_set_flags(struct crypto_skcipher *tfm, | |
317 | u32 flags) | |
318 | { | |
319 | crypto_tfm_set_flags(crypto_skcipher_tfm(tfm), flags); | |
320 | } | |
321 | ||
322 | static inline void crypto_skcipher_clear_flags(struct crypto_skcipher *tfm, | |
323 | u32 flags) | |
324 | { | |
325 | crypto_tfm_clear_flags(crypto_skcipher_tfm(tfm), flags); | |
326 | } | |
327 | ||
b350bee5 KC |
328 | static inline u32 crypto_sync_skcipher_get_flags( |
329 | struct crypto_sync_skcipher *tfm) | |
330 | { | |
331 | return crypto_skcipher_get_flags(&tfm->base); | |
332 | } | |
333 | ||
334 | static inline void crypto_sync_skcipher_set_flags( | |
335 | struct crypto_sync_skcipher *tfm, u32 flags) | |
336 | { | |
337 | crypto_skcipher_set_flags(&tfm->base, flags); | |
338 | } | |
339 | ||
340 | static inline void crypto_sync_skcipher_clear_flags( | |
341 | struct crypto_sync_skcipher *tfm, u32 flags) | |
342 | { | |
343 | crypto_skcipher_clear_flags(&tfm->base, flags); | |
344 | } | |
345 | ||
7a7ffe65 HX |
346 | /** |
347 | * crypto_skcipher_setkey() - set key for cipher | |
348 | * @tfm: cipher handle | |
349 | * @key: buffer holding the key | |
350 | * @keylen: length of the key in bytes | |
351 | * | |
352 | * The caller provided key is set for the skcipher referenced by the cipher | |
353 | * handle. | |
354 | * | |
355 | * Note, the key length determines the cipher type. Many block ciphers implement | |
356 | * different cipher modes depending on the key size, such as AES-128 vs AES-192 | |
357 | * vs. AES-256. When providing a 16 byte key for an AES cipher handle, AES-128 | |
358 | * is performed. | |
359 | * | |
360 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred | |
361 | */ | |
15252d94 EB |
362 | int crypto_skcipher_setkey(struct crypto_skcipher *tfm, |
363 | const u8 *key, unsigned int keylen); | |
7a7ffe65 | 364 | |
b350bee5 KC |
365 | static inline int crypto_sync_skcipher_setkey(struct crypto_sync_skcipher *tfm, |
366 | const u8 *key, unsigned int keylen) | |
367 | { | |
368 | return crypto_skcipher_setkey(&tfm->base, key, keylen); | |
369 | } | |
370 | ||
7bada033 EB |
371 | static inline unsigned int crypto_skcipher_min_keysize( |
372 | struct crypto_skcipher *tfm) | |
373 | { | |
374 | return crypto_skcipher_alg(tfm)->min_keysize; | |
375 | } | |
376 | ||
9ac0d136 | 377 | static inline unsigned int crypto_skcipher_max_keysize( |
973fb3fb HX |
378 | struct crypto_skcipher *tfm) |
379 | { | |
9ac0d136 | 380 | return crypto_skcipher_alg(tfm)->max_keysize; |
a1383cd8 HX |
381 | } |
382 | ||
7a7ffe65 HX |
383 | /** |
384 | * crypto_skcipher_reqtfm() - obtain cipher handle from request | |
385 | * @req: skcipher_request out of which the cipher handle is to be obtained | |
386 | * | |
387 | * Return the crypto_skcipher handle when furnishing an skcipher_request | |
388 | * data structure. | |
389 | * | |
390 | * Return: crypto_skcipher handle | |
391 | */ | |
392 | static inline struct crypto_skcipher *crypto_skcipher_reqtfm( | |
393 | struct skcipher_request *req) | |
394 | { | |
395 | return __crypto_skcipher_cast(req->base.tfm); | |
396 | } | |
397 | ||
b350bee5 KC |
398 | static inline struct crypto_sync_skcipher *crypto_sync_skcipher_reqtfm( |
399 | struct skcipher_request *req) | |
400 | { | |
401 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
402 | ||
403 | return container_of(tfm, struct crypto_sync_skcipher, base); | |
404 | } | |
405 | ||
7a7ffe65 HX |
406 | /** |
407 | * crypto_skcipher_encrypt() - encrypt plaintext | |
408 | * @req: reference to the skcipher_request handle that holds all information | |
409 | * needed to perform the cipher operation | |
410 | * | |
411 | * Encrypt plaintext data using the skcipher_request handle. That data | |
412 | * structure and how it is filled with data is discussed with the | |
413 | * skcipher_request_* functions. | |
414 | * | |
415 | * Return: 0 if the cipher operation was successful; < 0 if an error occurred | |
416 | */ | |
81bcbb1e | 417 | int crypto_skcipher_encrypt(struct skcipher_request *req); |
7a7ffe65 HX |
418 | |
419 | /** | |
420 | * crypto_skcipher_decrypt() - decrypt ciphertext | |
421 | * @req: reference to the skcipher_request handle that holds all information | |
422 | * needed to perform the cipher operation | |
423 | * | |
424 | * Decrypt ciphertext data using the skcipher_request handle. That data | |
425 | * structure and how it is filled with data is discussed with the | |
426 | * skcipher_request_* functions. | |
427 | * | |
428 | * Return: 0 if the cipher operation was successful; < 0 if an error occurred | |
429 | */ | |
81bcbb1e | 430 | int crypto_skcipher_decrypt(struct skcipher_request *req); |
7a7ffe65 HX |
431 | |
432 | /** | |
433 | * DOC: Symmetric Key Cipher Request Handle | |
434 | * | |
435 | * The skcipher_request data structure contains all pointers to data | |
436 | * required for the symmetric key cipher operation. This includes the cipher | |
437 | * handle (which can be used by multiple skcipher_request instances), pointer | |
438 | * to plaintext and ciphertext, asynchronous callback function, etc. It acts | |
439 | * as a handle to the skcipher_request_* API calls in a similar way as | |
440 | * skcipher handle to the crypto_skcipher_* API calls. | |
441 | */ | |
442 | ||
443 | /** | |
444 | * crypto_skcipher_reqsize() - obtain size of the request data structure | |
445 | * @tfm: cipher handle | |
446 | * | |
447 | * Return: number of bytes | |
448 | */ | |
449 | static inline unsigned int crypto_skcipher_reqsize(struct crypto_skcipher *tfm) | |
450 | { | |
451 | return tfm->reqsize; | |
452 | } | |
453 | ||
454 | /** | |
455 | * skcipher_request_set_tfm() - update cipher handle reference in request | |
456 | * @req: request handle to be modified | |
457 | * @tfm: cipher handle that shall be added to the request handle | |
458 | * | |
459 | * Allow the caller to replace the existing skcipher handle in the request | |
460 | * data structure with a different one. | |
461 | */ | |
462 | static inline void skcipher_request_set_tfm(struct skcipher_request *req, | |
463 | struct crypto_skcipher *tfm) | |
464 | { | |
465 | req->base.tfm = crypto_skcipher_tfm(tfm); | |
466 | } | |
467 | ||
b350bee5 KC |
468 | static inline void skcipher_request_set_sync_tfm(struct skcipher_request *req, |
469 | struct crypto_sync_skcipher *tfm) | |
470 | { | |
471 | skcipher_request_set_tfm(req, &tfm->base); | |
472 | } | |
473 | ||
7a7ffe65 HX |
474 | static inline struct skcipher_request *skcipher_request_cast( |
475 | struct crypto_async_request *req) | |
476 | { | |
477 | return container_of(req, struct skcipher_request, base); | |
478 | } | |
479 | ||
480 | /** | |
481 | * skcipher_request_alloc() - allocate request data structure | |
482 | * @tfm: cipher handle to be registered with the request | |
483 | * @gfp: memory allocation flag that is handed to kmalloc by the API call. | |
484 | * | |
485 | * Allocate the request data structure that must be used with the skcipher | |
486 | * encrypt and decrypt API calls. During the allocation, the provided skcipher | |
487 | * handle is registered in the request data structure. | |
488 | * | |
6eae29e7 | 489 | * Return: allocated request handle in case of success, or NULL if out of memory |
7a7ffe65 HX |
490 | */ |
491 | static inline struct skcipher_request *skcipher_request_alloc( | |
492 | struct crypto_skcipher *tfm, gfp_t gfp) | |
493 | { | |
494 | struct skcipher_request *req; | |
495 | ||
496 | req = kmalloc(sizeof(struct skcipher_request) + | |
497 | crypto_skcipher_reqsize(tfm), gfp); | |
498 | ||
499 | if (likely(req)) | |
500 | skcipher_request_set_tfm(req, tfm); | |
501 | ||
502 | return req; | |
503 | } | |
504 | ||
505 | /** | |
506 | * skcipher_request_free() - zeroize and free request data structure | |
507 | * @req: request data structure cipher handle to be freed | |
508 | */ | |
509 | static inline void skcipher_request_free(struct skcipher_request *req) | |
510 | { | |
453431a5 | 511 | kfree_sensitive(req); |
7a7ffe65 HX |
512 | } |
513 | ||
1aaa753d HX |
514 | static inline void skcipher_request_zero(struct skcipher_request *req) |
515 | { | |
516 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
517 | ||
518 | memzero_explicit(req, sizeof(*req) + crypto_skcipher_reqsize(tfm)); | |
519 | } | |
520 | ||
7a7ffe65 HX |
521 | /** |
522 | * skcipher_request_set_callback() - set asynchronous callback function | |
523 | * @req: request handle | |
524 | * @flags: specify zero or an ORing of the flags | |
0184cfe7 | 525 | * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and |
7a7ffe65 HX |
526 | * increase the wait queue beyond the initial maximum size; |
527 | * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep | |
528 | * @compl: callback function pointer to be registered with the request handle | |
529 | * @data: The data pointer refers to memory that is not used by the kernel | |
530 | * crypto API, but provided to the callback function for it to use. Here, | |
531 | * the caller can provide a reference to memory the callback function can | |
532 | * operate on. As the callback function is invoked asynchronously to the | |
533 | * related functionality, it may need to access data structures of the | |
534 | * related functionality which can be referenced using this pointer. The | |
535 | * callback function can access the memory via the "data" field in the | |
536 | * crypto_async_request data structure provided to the callback function. | |
537 | * | |
538 | * This function allows setting the callback function that is triggered once the | |
539 | * cipher operation completes. | |
540 | * | |
541 | * The callback function is registered with the skcipher_request handle and | |
0184cfe7 | 542 | * must comply with the following template:: |
7a7ffe65 HX |
543 | * |
544 | * void callback_function(struct crypto_async_request *req, int error) | |
545 | */ | |
546 | static inline void skcipher_request_set_callback(struct skcipher_request *req, | |
547 | u32 flags, | |
548 | crypto_completion_t compl, | |
549 | void *data) | |
550 | { | |
551 | req->base.complete = compl; | |
552 | req->base.data = data; | |
553 | req->base.flags = flags; | |
554 | } | |
555 | ||
556 | /** | |
557 | * skcipher_request_set_crypt() - set data buffers | |
558 | * @req: request handle | |
559 | * @src: source scatter / gather list | |
560 | * @dst: destination scatter / gather list | |
561 | * @cryptlen: number of bytes to process from @src | |
562 | * @iv: IV for the cipher operation which must comply with the IV size defined | |
563 | * by crypto_skcipher_ivsize | |
564 | * | |
565 | * This function allows setting of the source data and destination data | |
566 | * scatter / gather lists. | |
567 | * | |
568 | * For encryption, the source is treated as the plaintext and the | |
569 | * destination is the ciphertext. For a decryption operation, the use is | |
570 | * reversed - the source is the ciphertext and the destination is the plaintext. | |
571 | */ | |
572 | static inline void skcipher_request_set_crypt( | |
573 | struct skcipher_request *req, | |
574 | struct scatterlist *src, struct scatterlist *dst, | |
575 | unsigned int cryptlen, void *iv) | |
576 | { | |
577 | req->src = src; | |
578 | req->dst = dst; | |
579 | req->cryptlen = cryptlen; | |
580 | req->iv = iv; | |
581 | } | |
582 | ||
61da88e2 HX |
583 | #endif /* _CRYPTO_SKCIPHER_H */ |
584 |