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