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18e33e6d HX |
1 | /* |
2 | * Hash: Hash algorithms under the crypto API | |
3 | * | |
4 | * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
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) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #ifndef _CRYPTO_HASH_H | |
14 | #define _CRYPTO_HASH_H | |
15 | ||
16 | #include <linux/crypto.h> | |
e67ffe0a | 17 | #include <linux/string.h> |
18e33e6d | 18 | |
88056ec3 HX |
19 | struct crypto_ahash; |
20 | ||
5d8c723f SM |
21 | /** |
22 | * DOC: Message Digest Algorithm Definitions | |
23 | * | |
24 | * These data structures define modular message digest algorithm | |
25 | * implementations, managed via crypto_register_ahash(), | |
26 | * crypto_register_shash(), crypto_unregister_ahash() and | |
27 | * crypto_unregister_shash(). | |
28 | */ | |
29 | ||
30 | /** | |
31 | * struct hash_alg_common - define properties of message digest | |
32 | * @digestsize: Size of the result of the transformation. A buffer of this size | |
33 | * must be available to the @final and @finup calls, so they can | |
34 | * store the resulting hash into it. For various predefined sizes, | |
35 | * search include/crypto/ using | |
36 | * git grep _DIGEST_SIZE include/crypto. | |
37 | * @statesize: Size of the block for partial state of the transformation. A | |
38 | * buffer of this size must be passed to the @export function as it | |
39 | * will save the partial state of the transformation into it. On the | |
40 | * other side, the @import function will load the state from a | |
41 | * buffer of this size as well. | |
52744af3 SM |
42 | * @base: Start of data structure of cipher algorithm. The common data |
43 | * structure of crypto_alg contains information common to all ciphers. | |
44 | * The hash_alg_common data structure now adds the hash-specific | |
45 | * information. | |
5d8c723f | 46 | */ |
88056ec3 HX |
47 | struct hash_alg_common { |
48 | unsigned int digestsize; | |
49 | unsigned int statesize; | |
50 | ||
51 | struct crypto_alg base; | |
52 | }; | |
53 | ||
54 | struct ahash_request { | |
55 | struct crypto_async_request base; | |
56 | ||
57 | unsigned int nbytes; | |
58 | struct scatterlist *src; | |
59 | u8 *result; | |
60 | ||
66f6ce5e HX |
61 | /* This field may only be used by the ahash API code. */ |
62 | void *priv; | |
63 | ||
88056ec3 HX |
64 | void *__ctx[] CRYPTO_MINALIGN_ATTR; |
65 | }; | |
66 | ||
d4421c54 HX |
67 | #define AHASH_REQUEST_ON_STACK(name, ahash) \ |
68 | char __##name##_desc[sizeof(struct ahash_request) + \ | |
69 | crypto_ahash_reqsize(ahash)] CRYPTO_MINALIGN_ATTR; \ | |
70 | struct ahash_request *name = (void *)__##name##_desc | |
71 | ||
5d8c723f SM |
72 | /** |
73 | * struct ahash_alg - asynchronous message digest definition | |
b40fa82c | 74 | * @init: **[mandatory]** Initialize the transformation context. Intended only to initialize the |
12f7c14a | 75 | * state of the HASH transformation at the beginning. This shall fill in |
5d8c723f | 76 | * the internal structures used during the entire duration of the whole |
3d053d53 KK |
77 | * transformation. No data processing happens at this point. Driver code |
78 | * implementation must not use req->result. | |
b40fa82c | 79 | * @update: **[mandatory]** Push a chunk of data into the driver for transformation. This |
5d8c723f SM |
80 | * function actually pushes blocks of data from upper layers into the |
81 | * driver, which then passes those to the hardware as seen fit. This | |
82 | * function must not finalize the HASH transformation by calculating the | |
83 | * final message digest as this only adds more data into the | |
84 | * transformation. This function shall not modify the transformation | |
85 | * context, as this function may be called in parallel with the same | |
86 | * transformation object. Data processing can happen synchronously | |
3d053d53 KK |
87 | * [SHASH] or asynchronously [AHASH] at this point. Driver must not use |
88 | * req->result. | |
b40fa82c | 89 | * @final: **[mandatory]** Retrieve result from the driver. This function finalizes the |
5d8c723f SM |
90 | * transformation and retrieves the resulting hash from the driver and |
91 | * pushes it back to upper layers. No data processing happens at this | |
560b1a82 KK |
92 | * point unless hardware requires it to finish the transformation |
93 | * (then the data buffered by the device driver is processed). | |
b40fa82c | 94 | * @finup: **[optional]** Combination of @update and @final. This function is effectively a |
5d8c723f SM |
95 | * combination of @update and @final calls issued in sequence. As some |
96 | * hardware cannot do @update and @final separately, this callback was | |
97 | * added to allow such hardware to be used at least by IPsec. Data | |
98 | * processing can happen synchronously [SHASH] or asynchronously [AHASH] | |
99 | * at this point. | |
100 | * @digest: Combination of @init and @update and @final. This function | |
101 | * effectively behaves as the entire chain of operations, @init, | |
102 | * @update and @final issued in sequence. Just like @finup, this was | |
103 | * added for hardware which cannot do even the @finup, but can only do | |
104 | * the whole transformation in one run. Data processing can happen | |
105 | * synchronously [SHASH] or asynchronously [AHASH] at this point. | |
106 | * @setkey: Set optional key used by the hashing algorithm. Intended to push | |
107 | * optional key used by the hashing algorithm from upper layers into | |
108 | * the driver. This function can store the key in the transformation | |
109 | * context or can outright program it into the hardware. In the former | |
110 | * case, one must be careful to program the key into the hardware at | |
111 | * appropriate time and one must be careful that .setkey() can be | |
112 | * called multiple times during the existence of the transformation | |
113 | * object. Not all hashing algorithms do implement this function as it | |
114 | * is only needed for keyed message digests. SHAx/MDx/CRCx do NOT | |
115 | * implement this function. HMAC(MDx)/HMAC(SHAx)/CMAC(AES) do implement | |
116 | * this function. This function must be called before any other of the | |
117 | * @init, @update, @final, @finup, @digest is called. No data | |
118 | * processing happens at this point. | |
119 | * @export: Export partial state of the transformation. This function dumps the | |
120 | * entire state of the ongoing transformation into a provided block of | |
121 | * data so it can be @import 'ed back later on. This is useful in case | |
122 | * you want to save partial result of the transformation after | |
123 | * processing certain amount of data and reload this partial result | |
124 | * multiple times later on for multiple re-use. No data processing | |
3d053d53 | 125 | * happens at this point. Driver must not use req->result. |
5d8c723f SM |
126 | * @import: Import partial state of the transformation. This function loads the |
127 | * entire state of the ongoing transformation from a provided block of | |
128 | * data so the transformation can continue from this point onward. No | |
3d053d53 KK |
129 | * data processing happens at this point. Driver must not use |
130 | * req->result. | |
52744af3 | 131 | * @halg: see struct hash_alg_common |
5d8c723f | 132 | */ |
88056ec3 HX |
133 | struct ahash_alg { |
134 | int (*init)(struct ahash_request *req); | |
135 | int (*update)(struct ahash_request *req); | |
136 | int (*final)(struct ahash_request *req); | |
137 | int (*finup)(struct ahash_request *req); | |
138 | int (*digest)(struct ahash_request *req); | |
139 | int (*export)(struct ahash_request *req, void *out); | |
140 | int (*import)(struct ahash_request *req, const void *in); | |
141 | int (*setkey)(struct crypto_ahash *tfm, const u8 *key, | |
142 | unsigned int keylen); | |
143 | ||
144 | struct hash_alg_common halg; | |
145 | }; | |
146 | ||
7b5a080b HX |
147 | struct shash_desc { |
148 | struct crypto_shash *tfm; | |
149 | u32 flags; | |
150 | ||
151 | void *__ctx[] CRYPTO_MINALIGN_ATTR; | |
152 | }; | |
153 | ||
b68a7ec1 KC |
154 | #define HASH_MAX_DIGESTSIZE 64 |
155 | #define HASH_MAX_DESCSIZE 360 | |
156 | #define HASH_MAX_STATESIZE 512 | |
157 | ||
a0a77af1 BW |
158 | #define SHASH_DESC_ON_STACK(shash, ctx) \ |
159 | char __##shash##_desc[sizeof(struct shash_desc) + \ | |
b68a7ec1 | 160 | HASH_MAX_DESCSIZE] CRYPTO_MINALIGN_ATTR; \ |
a0a77af1 BW |
161 | struct shash_desc *shash = (struct shash_desc *)__##shash##_desc |
162 | ||
5d8c723f SM |
163 | /** |
164 | * struct shash_alg - synchronous message digest definition | |
165 | * @init: see struct ahash_alg | |
166 | * @update: see struct ahash_alg | |
167 | * @final: see struct ahash_alg | |
168 | * @finup: see struct ahash_alg | |
169 | * @digest: see struct ahash_alg | |
170 | * @export: see struct ahash_alg | |
171 | * @import: see struct ahash_alg | |
172 | * @setkey: see struct ahash_alg | |
173 | * @digestsize: see struct ahash_alg | |
174 | * @statesize: see struct ahash_alg | |
52744af3 | 175 | * @descsize: Size of the operational state for the message digest. This state |
5d8c723f SM |
176 | * size is the memory size that needs to be allocated for |
177 | * shash_desc.__ctx | |
178 | * @base: internally used | |
179 | */ | |
7b5a080b HX |
180 | struct shash_alg { |
181 | int (*init)(struct shash_desc *desc); | |
182 | int (*update)(struct shash_desc *desc, const u8 *data, | |
183 | unsigned int len); | |
184 | int (*final)(struct shash_desc *desc, u8 *out); | |
185 | int (*finup)(struct shash_desc *desc, const u8 *data, | |
186 | unsigned int len, u8 *out); | |
187 | int (*digest)(struct shash_desc *desc, const u8 *data, | |
188 | unsigned int len, u8 *out); | |
99d27e1c HX |
189 | int (*export)(struct shash_desc *desc, void *out); |
190 | int (*import)(struct shash_desc *desc, const void *in); | |
7b5a080b HX |
191 | int (*setkey)(struct crypto_shash *tfm, const u8 *key, |
192 | unsigned int keylen); | |
193 | ||
194 | unsigned int descsize; | |
88056ec3 HX |
195 | |
196 | /* These fields must match hash_alg_common. */ | |
fa649664 HX |
197 | unsigned int digestsize |
198 | __attribute__ ((aligned(__alignof__(struct hash_alg_common)))); | |
99d27e1c | 199 | unsigned int statesize; |
7b5a080b HX |
200 | |
201 | struct crypto_alg base; | |
202 | }; | |
203 | ||
18e33e6d | 204 | struct crypto_ahash { |
88056ec3 HX |
205 | int (*init)(struct ahash_request *req); |
206 | int (*update)(struct ahash_request *req); | |
207 | int (*final)(struct ahash_request *req); | |
208 | int (*finup)(struct ahash_request *req); | |
209 | int (*digest)(struct ahash_request *req); | |
210 | int (*export)(struct ahash_request *req, void *out); | |
211 | int (*import)(struct ahash_request *req, const void *in); | |
212 | int (*setkey)(struct crypto_ahash *tfm, const u8 *key, | |
213 | unsigned int keylen); | |
214 | ||
88056ec3 | 215 | unsigned int reqsize; |
18e33e6d HX |
216 | struct crypto_tfm base; |
217 | }; | |
218 | ||
7b5a080b | 219 | struct crypto_shash { |
113adefc | 220 | unsigned int descsize; |
7b5a080b HX |
221 | struct crypto_tfm base; |
222 | }; | |
223 | ||
90240ffb SM |
224 | /** |
225 | * DOC: Asynchronous Message Digest API | |
226 | * | |
227 | * The asynchronous message digest API is used with the ciphers of type | |
228 | * CRYPTO_ALG_TYPE_AHASH (listed as type "ahash" in /proc/crypto) | |
229 | * | |
230 | * The asynchronous cipher operation discussion provided for the | |
231 | * CRYPTO_ALG_TYPE_ABLKCIPHER API applies here as well. | |
232 | */ | |
233 | ||
18e33e6d HX |
234 | static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm) |
235 | { | |
88056ec3 | 236 | return container_of(tfm, struct crypto_ahash, base); |
18e33e6d HX |
237 | } |
238 | ||
90240ffb SM |
239 | /** |
240 | * crypto_alloc_ahash() - allocate ahash cipher handle | |
241 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
242 | * ahash cipher | |
243 | * @type: specifies the type of the cipher | |
244 | * @mask: specifies the mask for the cipher | |
245 | * | |
246 | * Allocate a cipher handle for an ahash. The returned struct | |
247 | * crypto_ahash is the cipher handle that is required for any subsequent | |
248 | * API invocation for that ahash. | |
249 | * | |
250 | * Return: allocated cipher handle in case of success; IS_ERR() is true in case | |
251 | * of an error, PTR_ERR() returns the error code. | |
252 | */ | |
88056ec3 HX |
253 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, |
254 | u32 mask); | |
18e33e6d HX |
255 | |
256 | static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm) | |
257 | { | |
258 | return &tfm->base; | |
259 | } | |
260 | ||
90240ffb SM |
261 | /** |
262 | * crypto_free_ahash() - zeroize and free the ahash handle | |
263 | * @tfm: cipher handle to be freed | |
264 | */ | |
18e33e6d HX |
265 | static inline void crypto_free_ahash(struct crypto_ahash *tfm) |
266 | { | |
88056ec3 | 267 | crypto_destroy_tfm(tfm, crypto_ahash_tfm(tfm)); |
18e33e6d HX |
268 | } |
269 | ||
8d18e34c HX |
270 | /** |
271 | * crypto_has_ahash() - Search for the availability of an ahash. | |
272 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
273 | * ahash | |
274 | * @type: specifies the type of the ahash | |
275 | * @mask: specifies the mask for the ahash | |
276 | * | |
277 | * Return: true when the ahash is known to the kernel crypto API; false | |
278 | * otherwise | |
279 | */ | |
280 | int crypto_has_ahash(const char *alg_name, u32 type, u32 mask); | |
281 | ||
d12481bc HX |
282 | static inline const char *crypto_ahash_alg_name(struct crypto_ahash *tfm) |
283 | { | |
284 | return crypto_tfm_alg_name(crypto_ahash_tfm(tfm)); | |
285 | } | |
286 | ||
287 | static inline const char *crypto_ahash_driver_name(struct crypto_ahash *tfm) | |
288 | { | |
289 | return crypto_tfm_alg_driver_name(crypto_ahash_tfm(tfm)); | |
290 | } | |
291 | ||
18e33e6d HX |
292 | static inline unsigned int crypto_ahash_alignmask( |
293 | struct crypto_ahash *tfm) | |
294 | { | |
295 | return crypto_tfm_alg_alignmask(crypto_ahash_tfm(tfm)); | |
296 | } | |
297 | ||
524e56c3 HX |
298 | /** |
299 | * crypto_ahash_blocksize() - obtain block size for cipher | |
300 | * @tfm: cipher handle | |
301 | * | |
302 | * The block size for the message digest cipher referenced with the cipher | |
303 | * handle is returned. | |
304 | * | |
305 | * Return: block size of cipher | |
306 | */ | |
307 | static inline unsigned int crypto_ahash_blocksize(struct crypto_ahash *tfm) | |
308 | { | |
309 | return crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); | |
310 | } | |
311 | ||
88056ec3 HX |
312 | static inline struct hash_alg_common *__crypto_hash_alg_common( |
313 | struct crypto_alg *alg) | |
314 | { | |
315 | return container_of(alg, struct hash_alg_common, base); | |
316 | } | |
317 | ||
318 | static inline struct hash_alg_common *crypto_hash_alg_common( | |
319 | struct crypto_ahash *tfm) | |
18e33e6d | 320 | { |
88056ec3 | 321 | return __crypto_hash_alg_common(crypto_ahash_tfm(tfm)->__crt_alg); |
18e33e6d HX |
322 | } |
323 | ||
90240ffb SM |
324 | /** |
325 | * crypto_ahash_digestsize() - obtain message digest size | |
326 | * @tfm: cipher handle | |
327 | * | |
328 | * The size for the message digest created by the message digest cipher | |
329 | * referenced with the cipher handle is returned. | |
330 | * | |
331 | * | |
332 | * Return: message digest size of cipher | |
333 | */ | |
18e33e6d HX |
334 | static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm) |
335 | { | |
500b3e3c | 336 | return crypto_hash_alg_common(tfm)->digestsize; |
88056ec3 HX |
337 | } |
338 | ||
379d972b RV |
339 | /** |
340 | * crypto_ahash_statesize() - obtain size of the ahash state | |
341 | * @tfm: cipher handle | |
342 | * | |
343 | * Return the size of the ahash state. With the crypto_ahash_export() | |
344 | * function, the caller can export the state into a buffer whose size is | |
345 | * defined with this function. | |
346 | * | |
347 | * Return: size of the ahash state | |
348 | */ | |
88056ec3 HX |
349 | static inline unsigned int crypto_ahash_statesize(struct crypto_ahash *tfm) |
350 | { | |
351 | return crypto_hash_alg_common(tfm)->statesize; | |
18e33e6d HX |
352 | } |
353 | ||
354 | static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm) | |
355 | { | |
356 | return crypto_tfm_get_flags(crypto_ahash_tfm(tfm)); | |
357 | } | |
358 | ||
359 | static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags) | |
360 | { | |
361 | crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags); | |
362 | } | |
363 | ||
364 | static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags) | |
365 | { | |
366 | crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags); | |
367 | } | |
368 | ||
90240ffb SM |
369 | /** |
370 | * crypto_ahash_reqtfm() - obtain cipher handle from request | |
371 | * @req: asynchronous request handle that contains the reference to the ahash | |
372 | * cipher handle | |
373 | * | |
374 | * Return the ahash cipher handle that is registered with the asynchronous | |
375 | * request handle ahash_request. | |
376 | * | |
377 | * Return: ahash cipher handle | |
378 | */ | |
18e33e6d HX |
379 | static inline struct crypto_ahash *crypto_ahash_reqtfm( |
380 | struct ahash_request *req) | |
381 | { | |
382 | return __crypto_ahash_cast(req->base.tfm); | |
383 | } | |
384 | ||
90240ffb SM |
385 | /** |
386 | * crypto_ahash_reqsize() - obtain size of the request data structure | |
387 | * @tfm: cipher handle | |
388 | * | |
379d972b | 389 | * Return: size of the request data |
90240ffb | 390 | */ |
18e33e6d HX |
391 | static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm) |
392 | { | |
88056ec3 | 393 | return tfm->reqsize; |
18e33e6d HX |
394 | } |
395 | ||
dec8b786 HX |
396 | static inline void *ahash_request_ctx(struct ahash_request *req) |
397 | { | |
398 | return req->__ctx; | |
399 | } | |
400 | ||
90240ffb SM |
401 | /** |
402 | * crypto_ahash_setkey - set key for cipher handle | |
403 | * @tfm: cipher handle | |
404 | * @key: buffer holding the key | |
405 | * @keylen: length of the key in bytes | |
406 | * | |
407 | * The caller provided key is set for the ahash cipher. The cipher | |
408 | * handle must point to a keyed hash in order for this function to succeed. | |
409 | * | |
410 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred | |
411 | */ | |
66f6ce5e HX |
412 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, |
413 | unsigned int keylen); | |
90240ffb SM |
414 | |
415 | /** | |
416 | * crypto_ahash_finup() - update and finalize message digest | |
417 | * @req: reference to the ahash_request handle that holds all information | |
418 | * needed to perform the cipher operation | |
419 | * | |
420 | * This function is a "short-hand" for the function calls of | |
560b1a82 | 421 | * crypto_ahash_update and crypto_ahash_final. The parameters have the same |
90240ffb SM |
422 | * meaning as discussed for those separate functions. |
423 | * | |
560b1a82 | 424 | * Return: see crypto_ahash_final() |
90240ffb | 425 | */ |
66f6ce5e | 426 | int crypto_ahash_finup(struct ahash_request *req); |
90240ffb SM |
427 | |
428 | /** | |
429 | * crypto_ahash_final() - calculate message digest | |
430 | * @req: reference to the ahash_request handle that holds all information | |
431 | * needed to perform the cipher operation | |
432 | * | |
433 | * Finalize the message digest operation and create the message digest | |
434 | * based on all data added to the cipher handle. The message digest is placed | |
435 | * into the output buffer registered with the ahash_request handle. | |
436 | * | |
560b1a82 KK |
437 | * Return: |
438 | * 0 if the message digest was successfully calculated; | |
439 | * -EINPROGRESS if data is feeded into hardware (DMA) or queued for later; | |
440 | * -EBUSY if queue is full and request should be resubmitted later; | |
441 | * other < 0 if an error occurred | |
90240ffb | 442 | */ |
66f6ce5e | 443 | int crypto_ahash_final(struct ahash_request *req); |
90240ffb SM |
444 | |
445 | /** | |
446 | * crypto_ahash_digest() - calculate message digest for a buffer | |
447 | * @req: reference to the ahash_request handle that holds all information | |
448 | * needed to perform the cipher operation | |
449 | * | |
450 | * This function is a "short-hand" for the function calls of crypto_ahash_init, | |
451 | * crypto_ahash_update and crypto_ahash_final. The parameters have the same | |
452 | * meaning as discussed for those separate three functions. | |
453 | * | |
560b1a82 | 454 | * Return: see crypto_ahash_final() |
90240ffb | 455 | */ |
66f6ce5e | 456 | int crypto_ahash_digest(struct ahash_request *req); |
18e33e6d | 457 | |
90240ffb SM |
458 | /** |
459 | * crypto_ahash_export() - extract current message digest state | |
460 | * @req: reference to the ahash_request handle whose state is exported | |
461 | * @out: output buffer of sufficient size that can hold the hash state | |
462 | * | |
463 | * This function exports the hash state of the ahash_request handle into the | |
464 | * caller-allocated output buffer out which must have sufficient size (e.g. by | |
379d972b | 465 | * calling crypto_ahash_statesize()). |
90240ffb SM |
466 | * |
467 | * Return: 0 if the export was successful; < 0 if an error occurred | |
468 | */ | |
88056ec3 | 469 | static inline int crypto_ahash_export(struct ahash_request *req, void *out) |
dec8b786 | 470 | { |
88056ec3 | 471 | return crypto_ahash_reqtfm(req)->export(req, out); |
dec8b786 HX |
472 | } |
473 | ||
90240ffb SM |
474 | /** |
475 | * crypto_ahash_import() - import message digest state | |
476 | * @req: reference to ahash_request handle the state is imported into | |
477 | * @in: buffer holding the state | |
478 | * | |
479 | * This function imports the hash state into the ahash_request handle from the | |
480 | * input buffer. That buffer should have been generated with the | |
481 | * crypto_ahash_export function. | |
482 | * | |
483 | * Return: 0 if the import was successful; < 0 if an error occurred | |
484 | */ | |
88056ec3 HX |
485 | static inline int crypto_ahash_import(struct ahash_request *req, const void *in) |
486 | { | |
9fa68f62 EB |
487 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
488 | ||
489 | if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
490 | return -ENOKEY; | |
491 | ||
492 | return tfm->import(req, in); | |
88056ec3 | 493 | } |
dec8b786 | 494 | |
90240ffb SM |
495 | /** |
496 | * crypto_ahash_init() - (re)initialize message digest handle | |
497 | * @req: ahash_request handle that already is initialized with all necessary | |
498 | * data using the ahash_request_* API functions | |
499 | * | |
500 | * The call (re-)initializes the message digest referenced by the ahash_request | |
501 | * handle. Any potentially existing state created by previous operations is | |
502 | * discarded. | |
503 | * | |
560b1a82 | 504 | * Return: see crypto_ahash_final() |
90240ffb | 505 | */ |
318e5313 HX |
506 | static inline int crypto_ahash_init(struct ahash_request *req) |
507 | { | |
9fa68f62 EB |
508 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
509 | ||
510 | if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
511 | return -ENOKEY; | |
512 | ||
513 | return tfm->init(req); | |
318e5313 HX |
514 | } |
515 | ||
90240ffb SM |
516 | /** |
517 | * crypto_ahash_update() - add data to message digest for processing | |
518 | * @req: ahash_request handle that was previously initialized with the | |
519 | * crypto_ahash_init call. | |
520 | * | |
521 | * Updates the message digest state of the &ahash_request handle. The input data | |
522 | * is pointed to by the scatter/gather list registered in the &ahash_request | |
523 | * handle | |
524 | * | |
560b1a82 | 525 | * Return: see crypto_ahash_final() |
90240ffb | 526 | */ |
318e5313 HX |
527 | static inline int crypto_ahash_update(struct ahash_request *req) |
528 | { | |
88056ec3 | 529 | return crypto_ahash_reqtfm(req)->update(req); |
318e5313 HX |
530 | } |
531 | ||
90240ffb SM |
532 | /** |
533 | * DOC: Asynchronous Hash Request Handle | |
534 | * | |
535 | * The &ahash_request data structure contains all pointers to data | |
536 | * required for the asynchronous cipher operation. This includes the cipher | |
537 | * handle (which can be used by multiple &ahash_request instances), pointer | |
538 | * to plaintext and the message digest output buffer, asynchronous callback | |
539 | * function, etc. It acts as a handle to the ahash_request_* API calls in a | |
540 | * similar way as ahash handle to the crypto_ahash_* API calls. | |
541 | */ | |
542 | ||
543 | /** | |
544 | * ahash_request_set_tfm() - update cipher handle reference in request | |
545 | * @req: request handle to be modified | |
546 | * @tfm: cipher handle that shall be added to the request handle | |
547 | * | |
548 | * Allow the caller to replace the existing ahash handle in the request | |
549 | * data structure with a different one. | |
550 | */ | |
18e33e6d HX |
551 | static inline void ahash_request_set_tfm(struct ahash_request *req, |
552 | struct crypto_ahash *tfm) | |
553 | { | |
554 | req->base.tfm = crypto_ahash_tfm(tfm); | |
555 | } | |
556 | ||
90240ffb SM |
557 | /** |
558 | * ahash_request_alloc() - allocate request data structure | |
559 | * @tfm: cipher handle to be registered with the request | |
560 | * @gfp: memory allocation flag that is handed to kmalloc by the API call. | |
561 | * | |
562 | * Allocate the request data structure that must be used with the ahash | |
563 | * message digest API calls. During | |
564 | * the allocation, the provided ahash handle | |
565 | * is registered in the request data structure. | |
566 | * | |
6eae29e7 | 567 | * Return: allocated request handle in case of success, or NULL if out of memory |
90240ffb | 568 | */ |
18e33e6d HX |
569 | static inline struct ahash_request *ahash_request_alloc( |
570 | struct crypto_ahash *tfm, gfp_t gfp) | |
571 | { | |
572 | struct ahash_request *req; | |
573 | ||
574 | req = kmalloc(sizeof(struct ahash_request) + | |
575 | crypto_ahash_reqsize(tfm), gfp); | |
576 | ||
577 | if (likely(req)) | |
578 | ahash_request_set_tfm(req, tfm); | |
579 | ||
580 | return req; | |
581 | } | |
582 | ||
90240ffb SM |
583 | /** |
584 | * ahash_request_free() - zeroize and free the request data structure | |
585 | * @req: request data structure cipher handle to be freed | |
586 | */ | |
18e33e6d HX |
587 | static inline void ahash_request_free(struct ahash_request *req) |
588 | { | |
aef73cfc | 589 | kzfree(req); |
18e33e6d HX |
590 | } |
591 | ||
e67ffe0a HX |
592 | static inline void ahash_request_zero(struct ahash_request *req) |
593 | { | |
594 | memzero_explicit(req, sizeof(*req) + | |
595 | crypto_ahash_reqsize(crypto_ahash_reqtfm(req))); | |
596 | } | |
597 | ||
18e33e6d HX |
598 | static inline struct ahash_request *ahash_request_cast( |
599 | struct crypto_async_request *req) | |
600 | { | |
601 | return container_of(req, struct ahash_request, base); | |
602 | } | |
603 | ||
90240ffb SM |
604 | /** |
605 | * ahash_request_set_callback() - set asynchronous callback function | |
606 | * @req: request handle | |
607 | * @flags: specify zero or an ORing of the flags | |
608 | * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and | |
609 | * increase the wait queue beyond the initial maximum size; | |
610 | * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep | |
611 | * @compl: callback function pointer to be registered with the request handle | |
612 | * @data: The data pointer refers to memory that is not used by the kernel | |
613 | * crypto API, but provided to the callback function for it to use. Here, | |
614 | * the caller can provide a reference to memory the callback function can | |
615 | * operate on. As the callback function is invoked asynchronously to the | |
616 | * related functionality, it may need to access data structures of the | |
617 | * related functionality which can be referenced using this pointer. The | |
618 | * callback function can access the memory via the "data" field in the | |
619 | * &crypto_async_request data structure provided to the callback function. | |
620 | * | |
621 | * This function allows setting the callback function that is triggered once | |
622 | * the cipher operation completes. | |
623 | * | |
624 | * The callback function is registered with the &ahash_request handle and | |
0184cfe7 | 625 | * must comply with the following template:: |
90240ffb SM |
626 | * |
627 | * void callback_function(struct crypto_async_request *req, int error) | |
628 | */ | |
18e33e6d HX |
629 | static inline void ahash_request_set_callback(struct ahash_request *req, |
630 | u32 flags, | |
3e3dc25f | 631 | crypto_completion_t compl, |
18e33e6d HX |
632 | void *data) |
633 | { | |
3e3dc25f | 634 | req->base.complete = compl; |
18e33e6d HX |
635 | req->base.data = data; |
636 | req->base.flags = flags; | |
637 | } | |
638 | ||
90240ffb SM |
639 | /** |
640 | * ahash_request_set_crypt() - set data buffers | |
641 | * @req: ahash_request handle to be updated | |
642 | * @src: source scatter/gather list | |
643 | * @result: buffer that is filled with the message digest -- the caller must | |
644 | * ensure that the buffer has sufficient space by, for example, calling | |
645 | * crypto_ahash_digestsize() | |
646 | * @nbytes: number of bytes to process from the source scatter/gather list | |
647 | * | |
648 | * By using this call, the caller references the source scatter/gather list. | |
649 | * The source scatter/gather list points to the data the message digest is to | |
650 | * be calculated for. | |
651 | */ | |
18e33e6d HX |
652 | static inline void ahash_request_set_crypt(struct ahash_request *req, |
653 | struct scatterlist *src, u8 *result, | |
654 | unsigned int nbytes) | |
655 | { | |
656 | req->src = src; | |
657 | req->nbytes = nbytes; | |
658 | req->result = result; | |
659 | } | |
660 | ||
968ab291 SM |
661 | /** |
662 | * DOC: Synchronous Message Digest API | |
663 | * | |
664 | * The synchronous message digest API is used with the ciphers of type | |
665 | * CRYPTO_ALG_TYPE_SHASH (listed as type "shash" in /proc/crypto) | |
666 | * | |
667 | * The message digest API is able to maintain state information for the | |
668 | * caller. | |
669 | * | |
670 | * The synchronous message digest API can store user-related context in in its | |
671 | * shash_desc request data structure. | |
672 | */ | |
673 | ||
674 | /** | |
675 | * crypto_alloc_shash() - allocate message digest handle | |
676 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
677 | * message digest cipher | |
678 | * @type: specifies the type of the cipher | |
679 | * @mask: specifies the mask for the cipher | |
680 | * | |
681 | * Allocate a cipher handle for a message digest. The returned &struct | |
682 | * crypto_shash is the cipher handle that is required for any subsequent | |
683 | * API invocation for that message digest. | |
684 | * | |
685 | * Return: allocated cipher handle in case of success; IS_ERR() is true in case | |
686 | * of an error, PTR_ERR() returns the error code. | |
687 | */ | |
7b5a080b HX |
688 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, |
689 | u32 mask); | |
690 | ||
691 | static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm) | |
692 | { | |
693 | return &tfm->base; | |
694 | } | |
695 | ||
968ab291 SM |
696 | /** |
697 | * crypto_free_shash() - zeroize and free the message digest handle | |
698 | * @tfm: cipher handle to be freed | |
699 | */ | |
7b5a080b HX |
700 | static inline void crypto_free_shash(struct crypto_shash *tfm) |
701 | { | |
412e87ae | 702 | crypto_destroy_tfm(tfm, crypto_shash_tfm(tfm)); |
7b5a080b HX |
703 | } |
704 | ||
d12481bc HX |
705 | static inline const char *crypto_shash_alg_name(struct crypto_shash *tfm) |
706 | { | |
707 | return crypto_tfm_alg_name(crypto_shash_tfm(tfm)); | |
708 | } | |
709 | ||
710 | static inline const char *crypto_shash_driver_name(struct crypto_shash *tfm) | |
711 | { | |
712 | return crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm)); | |
713 | } | |
714 | ||
7b5a080b HX |
715 | static inline unsigned int crypto_shash_alignmask( |
716 | struct crypto_shash *tfm) | |
717 | { | |
718 | return crypto_tfm_alg_alignmask(crypto_shash_tfm(tfm)); | |
719 | } | |
720 | ||
968ab291 SM |
721 | /** |
722 | * crypto_shash_blocksize() - obtain block size for cipher | |
723 | * @tfm: cipher handle | |
724 | * | |
725 | * The block size for the message digest cipher referenced with the cipher | |
726 | * handle is returned. | |
727 | * | |
728 | * Return: block size of cipher | |
729 | */ | |
97495986 HX |
730 | static inline unsigned int crypto_shash_blocksize(struct crypto_shash *tfm) |
731 | { | |
732 | return crypto_tfm_alg_blocksize(crypto_shash_tfm(tfm)); | |
733 | } | |
734 | ||
7b5a080b HX |
735 | static inline struct shash_alg *__crypto_shash_alg(struct crypto_alg *alg) |
736 | { | |
737 | return container_of(alg, struct shash_alg, base); | |
738 | } | |
739 | ||
740 | static inline struct shash_alg *crypto_shash_alg(struct crypto_shash *tfm) | |
741 | { | |
742 | return __crypto_shash_alg(crypto_shash_tfm(tfm)->__crt_alg); | |
743 | } | |
744 | ||
968ab291 SM |
745 | /** |
746 | * crypto_shash_digestsize() - obtain message digest size | |
747 | * @tfm: cipher handle | |
748 | * | |
749 | * The size for the message digest created by the message digest cipher | |
750 | * referenced with the cipher handle is returned. | |
751 | * | |
752 | * Return: digest size of cipher | |
753 | */ | |
7b5a080b HX |
754 | static inline unsigned int crypto_shash_digestsize(struct crypto_shash *tfm) |
755 | { | |
756 | return crypto_shash_alg(tfm)->digestsize; | |
757 | } | |
758 | ||
99d27e1c HX |
759 | static inline unsigned int crypto_shash_statesize(struct crypto_shash *tfm) |
760 | { | |
761 | return crypto_shash_alg(tfm)->statesize; | |
762 | } | |
763 | ||
7b5a080b HX |
764 | static inline u32 crypto_shash_get_flags(struct crypto_shash *tfm) |
765 | { | |
766 | return crypto_tfm_get_flags(crypto_shash_tfm(tfm)); | |
767 | } | |
768 | ||
769 | static inline void crypto_shash_set_flags(struct crypto_shash *tfm, u32 flags) | |
770 | { | |
771 | crypto_tfm_set_flags(crypto_shash_tfm(tfm), flags); | |
772 | } | |
773 | ||
774 | static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags) | |
775 | { | |
776 | crypto_tfm_clear_flags(crypto_shash_tfm(tfm), flags); | |
777 | } | |
778 | ||
968ab291 SM |
779 | /** |
780 | * crypto_shash_descsize() - obtain the operational state size | |
781 | * @tfm: cipher handle | |
782 | * | |
783 | * The size of the operational state the cipher needs during operation is | |
784 | * returned for the hash referenced with the cipher handle. This size is | |
785 | * required to calculate the memory requirements to allow the caller allocating | |
786 | * sufficient memory for operational state. | |
787 | * | |
788 | * The operational state is defined with struct shash_desc where the size of | |
789 | * that data structure is to be calculated as | |
790 | * sizeof(struct shash_desc) + crypto_shash_descsize(alg) | |
791 | * | |
792 | * Return: size of the operational state | |
793 | */ | |
7b5a080b HX |
794 | static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm) |
795 | { | |
113adefc | 796 | return tfm->descsize; |
7b5a080b HX |
797 | } |
798 | ||
799 | static inline void *shash_desc_ctx(struct shash_desc *desc) | |
800 | { | |
801 | return desc->__ctx; | |
802 | } | |
803 | ||
968ab291 SM |
804 | /** |
805 | * crypto_shash_setkey() - set key for message digest | |
806 | * @tfm: cipher handle | |
807 | * @key: buffer holding the key | |
808 | * @keylen: length of the key in bytes | |
809 | * | |
810 | * The caller provided key is set for the keyed message digest cipher. The | |
811 | * cipher handle must point to a keyed message digest cipher in order for this | |
812 | * function to succeed. | |
813 | * | |
814 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred | |
815 | */ | |
7b5a080b HX |
816 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, |
817 | unsigned int keylen); | |
968ab291 SM |
818 | |
819 | /** | |
820 | * crypto_shash_digest() - calculate message digest for buffer | |
821 | * @desc: see crypto_shash_final() | |
822 | * @data: see crypto_shash_update() | |
823 | * @len: see crypto_shash_update() | |
824 | * @out: see crypto_shash_final() | |
825 | * | |
826 | * This function is a "short-hand" for the function calls of crypto_shash_init, | |
827 | * crypto_shash_update and crypto_shash_final. The parameters have the same | |
828 | * meaning as discussed for those separate three functions. | |
829 | * | |
830 | * Return: 0 if the message digest creation was successful; < 0 if an error | |
831 | * occurred | |
832 | */ | |
7b5a080b HX |
833 | int crypto_shash_digest(struct shash_desc *desc, const u8 *data, |
834 | unsigned int len, u8 *out); | |
835 | ||
968ab291 SM |
836 | /** |
837 | * crypto_shash_export() - extract operational state for message digest | |
838 | * @desc: reference to the operational state handle whose state is exported | |
839 | * @out: output buffer of sufficient size that can hold the hash state | |
840 | * | |
841 | * This function exports the hash state of the operational state handle into the | |
842 | * caller-allocated output buffer out which must have sufficient size (e.g. by | |
843 | * calling crypto_shash_descsize). | |
844 | * | |
845 | * Return: 0 if the export creation was successful; < 0 if an error occurred | |
846 | */ | |
99d27e1c | 847 | static inline int crypto_shash_export(struct shash_desc *desc, void *out) |
dec8b786 | 848 | { |
99d27e1c | 849 | return crypto_shash_alg(desc->tfm)->export(desc, out); |
dec8b786 HX |
850 | } |
851 | ||
968ab291 SM |
852 | /** |
853 | * crypto_shash_import() - import operational state | |
854 | * @desc: reference to the operational state handle the state imported into | |
855 | * @in: buffer holding the state | |
856 | * | |
857 | * This function imports the hash state into the operational state handle from | |
858 | * the input buffer. That buffer should have been generated with the | |
859 | * crypto_ahash_export function. | |
860 | * | |
861 | * Return: 0 if the import was successful; < 0 if an error occurred | |
862 | */ | |
99d27e1c HX |
863 | static inline int crypto_shash_import(struct shash_desc *desc, const void *in) |
864 | { | |
9fa68f62 EB |
865 | struct crypto_shash *tfm = desc->tfm; |
866 | ||
867 | if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
868 | return -ENOKEY; | |
869 | ||
870 | return crypto_shash_alg(tfm)->import(desc, in); | |
99d27e1c | 871 | } |
dec8b786 | 872 | |
968ab291 SM |
873 | /** |
874 | * crypto_shash_init() - (re)initialize message digest | |
875 | * @desc: operational state handle that is already filled | |
876 | * | |
877 | * The call (re-)initializes the message digest referenced by the | |
878 | * operational state handle. Any potentially existing state created by | |
879 | * previous operations is discarded. | |
880 | * | |
881 | * Return: 0 if the message digest initialization was successful; < 0 if an | |
882 | * error occurred | |
883 | */ | |
7b5a080b HX |
884 | static inline int crypto_shash_init(struct shash_desc *desc) |
885 | { | |
9fa68f62 EB |
886 | struct crypto_shash *tfm = desc->tfm; |
887 | ||
888 | if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
889 | return -ENOKEY; | |
890 | ||
891 | return crypto_shash_alg(tfm)->init(desc); | |
7b5a080b HX |
892 | } |
893 | ||
968ab291 SM |
894 | /** |
895 | * crypto_shash_update() - add data to message digest for processing | |
896 | * @desc: operational state handle that is already initialized | |
897 | * @data: input data to be added to the message digest | |
898 | * @len: length of the input data | |
899 | * | |
900 | * Updates the message digest state of the operational state handle. | |
901 | * | |
902 | * Return: 0 if the message digest update was successful; < 0 if an error | |
903 | * occurred | |
904 | */ | |
7b5a080b HX |
905 | int crypto_shash_update(struct shash_desc *desc, const u8 *data, |
906 | unsigned int len); | |
968ab291 SM |
907 | |
908 | /** | |
909 | * crypto_shash_final() - calculate message digest | |
910 | * @desc: operational state handle that is already filled with data | |
911 | * @out: output buffer filled with the message digest | |
912 | * | |
913 | * Finalize the message digest operation and create the message digest | |
914 | * based on all data added to the cipher handle. The message digest is placed | |
915 | * into the output buffer. The caller must ensure that the output buffer is | |
916 | * large enough by using crypto_shash_digestsize. | |
917 | * | |
918 | * Return: 0 if the message digest creation was successful; < 0 if an error | |
919 | * occurred | |
920 | */ | |
7b5a080b | 921 | int crypto_shash_final(struct shash_desc *desc, u8 *out); |
968ab291 SM |
922 | |
923 | /** | |
924 | * crypto_shash_finup() - calculate message digest of buffer | |
925 | * @desc: see crypto_shash_final() | |
926 | * @data: see crypto_shash_update() | |
927 | * @len: see crypto_shash_update() | |
928 | * @out: see crypto_shash_final() | |
929 | * | |
930 | * This function is a "short-hand" for the function calls of | |
931 | * crypto_shash_update and crypto_shash_final. The parameters have the same | |
932 | * meaning as discussed for those separate functions. | |
933 | * | |
934 | * Return: 0 if the message digest creation was successful; < 0 if an error | |
935 | * occurred | |
936 | */ | |
7b5a080b HX |
937 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data, |
938 | unsigned int len, u8 *out); | |
939 | ||
e67ffe0a HX |
940 | static inline void shash_desc_zero(struct shash_desc *desc) |
941 | { | |
942 | memzero_explicit(desc, | |
943 | sizeof(*desc) + crypto_shash_descsize(desc->tfm)); | |
944 | } | |
945 | ||
18e33e6d | 946 | #endif /* _CRYPTO_HASH_H */ |