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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
18e33e6d HX |
2 | /* |
3 | * Hash: Hash algorithms under the crypto API | |
4 | * | |
5 | * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> | |
18e33e6d HX |
6 | */ |
7 | ||
8 | #ifndef _CRYPTO_HASH_H | |
9 | #define _CRYPTO_HASH_H | |
10 | ||
11 | #include <linux/crypto.h> | |
e67ffe0a | 12 | #include <linux/string.h> |
18e33e6d | 13 | |
88056ec3 HX |
14 | struct crypto_ahash; |
15 | ||
5d8c723f SM |
16 | /** |
17 | * DOC: Message Digest Algorithm Definitions | |
18 | * | |
19 | * These data structures define modular message digest algorithm | |
20 | * implementations, managed via crypto_register_ahash(), | |
21 | * crypto_register_shash(), crypto_unregister_ahash() and | |
22 | * crypto_unregister_shash(). | |
23 | */ | |
24 | ||
25 | /** | |
26 | * struct hash_alg_common - define properties of message digest | |
27 | * @digestsize: Size of the result of the transformation. A buffer of this size | |
28 | * must be available to the @final and @finup calls, so they can | |
29 | * store the resulting hash into it. For various predefined sizes, | |
30 | * search include/crypto/ using | |
31 | * git grep _DIGEST_SIZE include/crypto. | |
32 | * @statesize: Size of the block for partial state of the transformation. A | |
33 | * buffer of this size must be passed to the @export function as it | |
34 | * will save the partial state of the transformation into it. On the | |
35 | * other side, the @import function will load the state from a | |
36 | * buffer of this size as well. | |
52744af3 SM |
37 | * @base: Start of data structure of cipher algorithm. The common data |
38 | * structure of crypto_alg contains information common to all ciphers. | |
39 | * The hash_alg_common data structure now adds the hash-specific | |
40 | * information. | |
5d8c723f | 41 | */ |
88056ec3 HX |
42 | struct hash_alg_common { |
43 | unsigned int digestsize; | |
44 | unsigned int statesize; | |
45 | ||
46 | struct crypto_alg base; | |
47 | }; | |
48 | ||
49 | struct ahash_request { | |
50 | struct crypto_async_request base; | |
51 | ||
52 | unsigned int nbytes; | |
53 | struct scatterlist *src; | |
54 | u8 *result; | |
55 | ||
66f6ce5e HX |
56 | /* This field may only be used by the ahash API code. */ |
57 | void *priv; | |
58 | ||
88056ec3 HX |
59 | void *__ctx[] CRYPTO_MINALIGN_ATTR; |
60 | }; | |
61 | ||
d4421c54 HX |
62 | #define AHASH_REQUEST_ON_STACK(name, ahash) \ |
63 | char __##name##_desc[sizeof(struct ahash_request) + \ | |
64 | crypto_ahash_reqsize(ahash)] CRYPTO_MINALIGN_ATTR; \ | |
65 | struct ahash_request *name = (void *)__##name##_desc | |
66 | ||
5d8c723f SM |
67 | /** |
68 | * struct ahash_alg - asynchronous message digest definition | |
b40fa82c | 69 | * @init: **[mandatory]** Initialize the transformation context. Intended only to initialize the |
12f7c14a | 70 | * state of the HASH transformation at the beginning. This shall fill in |
5d8c723f | 71 | * the internal structures used during the entire duration of the whole |
3d053d53 KK |
72 | * transformation. No data processing happens at this point. Driver code |
73 | * implementation must not use req->result. | |
b40fa82c | 74 | * @update: **[mandatory]** Push a chunk of data into the driver for transformation. This |
5d8c723f SM |
75 | * function actually pushes blocks of data from upper layers into the |
76 | * driver, which then passes those to the hardware as seen fit. This | |
77 | * function must not finalize the HASH transformation by calculating the | |
78 | * final message digest as this only adds more data into the | |
79 | * transformation. This function shall not modify the transformation | |
80 | * context, as this function may be called in parallel with the same | |
81 | * transformation object. Data processing can happen synchronously | |
3d053d53 KK |
82 | * [SHASH] or asynchronously [AHASH] at this point. Driver must not use |
83 | * req->result. | |
b40fa82c | 84 | * @final: **[mandatory]** Retrieve result from the driver. This function finalizes the |
5d8c723f SM |
85 | * transformation and retrieves the resulting hash from the driver and |
86 | * pushes it back to upper layers. No data processing happens at this | |
560b1a82 KK |
87 | * point unless hardware requires it to finish the transformation |
88 | * (then the data buffered by the device driver is processed). | |
b40fa82c | 89 | * @finup: **[optional]** Combination of @update and @final. This function is effectively a |
5d8c723f SM |
90 | * combination of @update and @final calls issued in sequence. As some |
91 | * hardware cannot do @update and @final separately, this callback was | |
92 | * added to allow such hardware to be used at least by IPsec. Data | |
93 | * processing can happen synchronously [SHASH] or asynchronously [AHASH] | |
94 | * at this point. | |
95 | * @digest: Combination of @init and @update and @final. This function | |
96 | * effectively behaves as the entire chain of operations, @init, | |
97 | * @update and @final issued in sequence. Just like @finup, this was | |
98 | * added for hardware which cannot do even the @finup, but can only do | |
99 | * the whole transformation in one run. Data processing can happen | |
100 | * synchronously [SHASH] or asynchronously [AHASH] at this point. | |
101 | * @setkey: Set optional key used by the hashing algorithm. Intended to push | |
102 | * optional key used by the hashing algorithm from upper layers into | |
103 | * the driver. This function can store the key in the transformation | |
104 | * context or can outright program it into the hardware. In the former | |
105 | * case, one must be careful to program the key into the hardware at | |
106 | * appropriate time and one must be careful that .setkey() can be | |
107 | * called multiple times during the existence of the transformation | |
108 | * object. Not all hashing algorithms do implement this function as it | |
109 | * is only needed for keyed message digests. SHAx/MDx/CRCx do NOT | |
110 | * implement this function. HMAC(MDx)/HMAC(SHAx)/CMAC(AES) do implement | |
111 | * this function. This function must be called before any other of the | |
112 | * @init, @update, @final, @finup, @digest is called. No data | |
113 | * processing happens at this point. | |
114 | * @export: Export partial state of the transformation. This function dumps the | |
115 | * entire state of the ongoing transformation into a provided block of | |
116 | * data so it can be @import 'ed back later on. This is useful in case | |
117 | * you want to save partial result of the transformation after | |
118 | * processing certain amount of data and reload this partial result | |
119 | * multiple times later on for multiple re-use. No data processing | |
3d053d53 | 120 | * happens at this point. Driver must not use req->result. |
5d8c723f SM |
121 | * @import: Import partial state of the transformation. This function loads the |
122 | * entire state of the ongoing transformation from a provided block of | |
123 | * data so the transformation can continue from this point onward. No | |
3d053d53 KK |
124 | * data processing happens at this point. Driver must not use |
125 | * req->result. | |
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; | |
7b5a080b HX |
144 | void *__ctx[] CRYPTO_MINALIGN_ATTR; |
145 | }; | |
146 | ||
b68a7ec1 | 147 | #define HASH_MAX_DIGESTSIZE 64 |
e1354400 EB |
148 | |
149 | /* | |
150 | * Worst case is hmac(sha3-224-generic). Its context is a nested 'shash_desc' | |
151 | * containing a 'struct sha3_state'. | |
152 | */ | |
153 | #define HASH_MAX_DESCSIZE (sizeof(struct shash_desc) + 360) | |
154 | ||
b68a7ec1 KC |
155 | #define HASH_MAX_STATESIZE 512 |
156 | ||
a0a77af1 BW |
157 | #define SHASH_DESC_ON_STACK(shash, ctx) \ |
158 | char __##shash##_desc[sizeof(struct shash_desc) + \ | |
b68a7ec1 | 159 | HASH_MAX_DESCSIZE] CRYPTO_MINALIGN_ATTR; \ |
a0a77af1 BW |
160 | struct shash_desc *shash = (struct shash_desc *)__##shash##_desc |
161 | ||
5d8c723f SM |
162 | /** |
163 | * struct shash_alg - synchronous message digest definition | |
164 | * @init: see struct ahash_alg | |
165 | * @update: see struct ahash_alg | |
166 | * @final: see struct ahash_alg | |
167 | * @finup: see struct ahash_alg | |
168 | * @digest: see struct ahash_alg | |
169 | * @export: see struct ahash_alg | |
170 | * @import: see struct ahash_alg | |
171 | * @setkey: see struct ahash_alg | |
172 | * @digestsize: see struct ahash_alg | |
173 | * @statesize: see struct ahash_alg | |
52744af3 | 174 | * @descsize: Size of the operational state for the message digest. This state |
5d8c723f SM |
175 | * size is the memory size that needs to be allocated for |
176 | * shash_desc.__ctx | |
177 | * @base: internally used | |
178 | */ | |
7b5a080b HX |
179 | struct shash_alg { |
180 | int (*init)(struct shash_desc *desc); | |
181 | int (*update)(struct shash_desc *desc, const u8 *data, | |
182 | unsigned int len); | |
183 | int (*final)(struct shash_desc *desc, u8 *out); | |
184 | int (*finup)(struct shash_desc *desc, const u8 *data, | |
185 | unsigned int len, u8 *out); | |
186 | int (*digest)(struct shash_desc *desc, const u8 *data, | |
187 | unsigned int len, u8 *out); | |
99d27e1c HX |
188 | int (*export)(struct shash_desc *desc, void *out); |
189 | int (*import)(struct shash_desc *desc, const void *in); | |
7b5a080b HX |
190 | int (*setkey)(struct crypto_shash *tfm, const u8 *key, |
191 | unsigned int keylen); | |
192 | ||
193 | unsigned int descsize; | |
88056ec3 HX |
194 | |
195 | /* These fields must match hash_alg_common. */ | |
fa649664 HX |
196 | unsigned int digestsize |
197 | __attribute__ ((aligned(__alignof__(struct hash_alg_common)))); | |
99d27e1c | 198 | unsigned int statesize; |
7b5a080b HX |
199 | |
200 | struct crypto_alg base; | |
201 | }; | |
202 | ||
18e33e6d | 203 | struct crypto_ahash { |
88056ec3 HX |
204 | int (*init)(struct ahash_request *req); |
205 | int (*update)(struct ahash_request *req); | |
206 | int (*final)(struct ahash_request *req); | |
207 | int (*finup)(struct ahash_request *req); | |
208 | int (*digest)(struct ahash_request *req); | |
209 | int (*export)(struct ahash_request *req, void *out); | |
210 | int (*import)(struct ahash_request *req, const void *in); | |
211 | int (*setkey)(struct crypto_ahash *tfm, const u8 *key, | |
212 | unsigned int keylen); | |
213 | ||
88056ec3 | 214 | unsigned int reqsize; |
18e33e6d HX |
215 | struct crypto_tfm base; |
216 | }; | |
217 | ||
7b5a080b | 218 | struct crypto_shash { |
113adefc | 219 | unsigned int descsize; |
7b5a080b HX |
220 | struct crypto_tfm base; |
221 | }; | |
222 | ||
90240ffb SM |
223 | /** |
224 | * DOC: Asynchronous Message Digest API | |
225 | * | |
226 | * The asynchronous message digest API is used with the ciphers of type | |
227 | * CRYPTO_ALG_TYPE_AHASH (listed as type "ahash" in /proc/crypto) | |
228 | * | |
229 | * The asynchronous cipher operation discussion provided for the | |
230 | * CRYPTO_ALG_TYPE_ABLKCIPHER API applies here as well. | |
231 | */ | |
232 | ||
18e33e6d HX |
233 | static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm) |
234 | { | |
88056ec3 | 235 | return container_of(tfm, struct crypto_ahash, base); |
18e33e6d HX |
236 | } |
237 | ||
90240ffb SM |
238 | /** |
239 | * crypto_alloc_ahash() - allocate ahash cipher handle | |
240 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
241 | * ahash cipher | |
242 | * @type: specifies the type of the cipher | |
243 | * @mask: specifies the mask for the cipher | |
244 | * | |
245 | * Allocate a cipher handle for an ahash. The returned struct | |
246 | * crypto_ahash is the cipher handle that is required for any subsequent | |
247 | * API invocation for that ahash. | |
248 | * | |
249 | * Return: allocated cipher handle in case of success; IS_ERR() is true in case | |
250 | * of an error, PTR_ERR() returns the error code. | |
251 | */ | |
88056ec3 HX |
252 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, |
253 | u32 mask); | |
18e33e6d HX |
254 | |
255 | static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm) | |
256 | { | |
257 | return &tfm->base; | |
258 | } | |
259 | ||
90240ffb SM |
260 | /** |
261 | * crypto_free_ahash() - zeroize and free the ahash handle | |
262 | * @tfm: cipher handle to be freed | |
263 | */ | |
18e33e6d HX |
264 | static inline void crypto_free_ahash(struct crypto_ahash *tfm) |
265 | { | |
88056ec3 | 266 | crypto_destroy_tfm(tfm, crypto_ahash_tfm(tfm)); |
18e33e6d HX |
267 | } |
268 | ||
8d18e34c HX |
269 | /** |
270 | * crypto_has_ahash() - Search for the availability of an ahash. | |
271 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
272 | * ahash | |
273 | * @type: specifies the type of the ahash | |
274 | * @mask: specifies the mask for the ahash | |
275 | * | |
276 | * Return: true when the ahash is known to the kernel crypto API; false | |
277 | * otherwise | |
278 | */ | |
279 | int crypto_has_ahash(const char *alg_name, u32 type, u32 mask); | |
280 | ||
d12481bc HX |
281 | static inline const char *crypto_ahash_alg_name(struct crypto_ahash *tfm) |
282 | { | |
283 | return crypto_tfm_alg_name(crypto_ahash_tfm(tfm)); | |
284 | } | |
285 | ||
286 | static inline const char *crypto_ahash_driver_name(struct crypto_ahash *tfm) | |
287 | { | |
288 | return crypto_tfm_alg_driver_name(crypto_ahash_tfm(tfm)); | |
289 | } | |
290 | ||
18e33e6d HX |
291 | static inline unsigned int crypto_ahash_alignmask( |
292 | struct crypto_ahash *tfm) | |
293 | { | |
294 | return crypto_tfm_alg_alignmask(crypto_ahash_tfm(tfm)); | |
295 | } | |
296 | ||
524e56c3 HX |
297 | /** |
298 | * crypto_ahash_blocksize() - obtain block size for cipher | |
299 | * @tfm: cipher handle | |
300 | * | |
301 | * The block size for the message digest cipher referenced with the cipher | |
302 | * handle is returned. | |
303 | * | |
304 | * Return: block size of cipher | |
305 | */ | |
306 | static inline unsigned int crypto_ahash_blocksize(struct crypto_ahash *tfm) | |
307 | { | |
308 | return crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); | |
309 | } | |
310 | ||
88056ec3 HX |
311 | static inline struct hash_alg_common *__crypto_hash_alg_common( |
312 | struct crypto_alg *alg) | |
313 | { | |
314 | return container_of(alg, struct hash_alg_common, base); | |
315 | } | |
316 | ||
317 | static inline struct hash_alg_common *crypto_hash_alg_common( | |
318 | struct crypto_ahash *tfm) | |
18e33e6d | 319 | { |
88056ec3 | 320 | return __crypto_hash_alg_common(crypto_ahash_tfm(tfm)->__crt_alg); |
18e33e6d HX |
321 | } |
322 | ||
90240ffb SM |
323 | /** |
324 | * crypto_ahash_digestsize() - obtain message digest size | |
325 | * @tfm: cipher handle | |
326 | * | |
327 | * The size for the message digest created by the message digest cipher | |
328 | * referenced with the cipher handle is returned. | |
329 | * | |
330 | * | |
331 | * Return: message digest size of cipher | |
332 | */ | |
18e33e6d HX |
333 | static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm) |
334 | { | |
500b3e3c | 335 | return crypto_hash_alg_common(tfm)->digestsize; |
88056ec3 HX |
336 | } |
337 | ||
379d972b RV |
338 | /** |
339 | * crypto_ahash_statesize() - obtain size of the ahash state | |
340 | * @tfm: cipher handle | |
341 | * | |
342 | * Return the size of the ahash state. With the crypto_ahash_export() | |
343 | * function, the caller can export the state into a buffer whose size is | |
344 | * defined with this function. | |
345 | * | |
346 | * Return: size of the ahash state | |
347 | */ | |
88056ec3 HX |
348 | static inline unsigned int crypto_ahash_statesize(struct crypto_ahash *tfm) |
349 | { | |
350 | return crypto_hash_alg_common(tfm)->statesize; | |
18e33e6d HX |
351 | } |
352 | ||
353 | static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm) | |
354 | { | |
355 | return crypto_tfm_get_flags(crypto_ahash_tfm(tfm)); | |
356 | } | |
357 | ||
358 | static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags) | |
359 | { | |
360 | crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags); | |
361 | } | |
362 | ||
363 | static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags) | |
364 | { | |
365 | crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags); | |
366 | } | |
367 | ||
90240ffb SM |
368 | /** |
369 | * crypto_ahash_reqtfm() - obtain cipher handle from request | |
370 | * @req: asynchronous request handle that contains the reference to the ahash | |
371 | * cipher handle | |
372 | * | |
373 | * Return the ahash cipher handle that is registered with the asynchronous | |
374 | * request handle ahash_request. | |
375 | * | |
376 | * Return: ahash cipher handle | |
377 | */ | |
18e33e6d HX |
378 | static inline struct crypto_ahash *crypto_ahash_reqtfm( |
379 | struct ahash_request *req) | |
380 | { | |
381 | return __crypto_ahash_cast(req->base.tfm); | |
382 | } | |
383 | ||
90240ffb SM |
384 | /** |
385 | * crypto_ahash_reqsize() - obtain size of the request data structure | |
386 | * @tfm: cipher handle | |
387 | * | |
379d972b | 388 | * Return: size of the request data |
90240ffb | 389 | */ |
18e33e6d HX |
390 | static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm) |
391 | { | |
88056ec3 | 392 | return tfm->reqsize; |
18e33e6d HX |
393 | } |
394 | ||
dec8b786 HX |
395 | static inline void *ahash_request_ctx(struct ahash_request *req) |
396 | { | |
397 | return req->__ctx; | |
398 | } | |
399 | ||
90240ffb SM |
400 | /** |
401 | * crypto_ahash_setkey - set key for cipher handle | |
402 | * @tfm: cipher handle | |
403 | * @key: buffer holding the key | |
404 | * @keylen: length of the key in bytes | |
405 | * | |
406 | * The caller provided key is set for the ahash cipher. The cipher | |
407 | * handle must point to a keyed hash in order for this function to succeed. | |
408 | * | |
409 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred | |
410 | */ | |
66f6ce5e HX |
411 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, |
412 | unsigned int keylen); | |
90240ffb SM |
413 | |
414 | /** | |
415 | * crypto_ahash_finup() - update and finalize message digest | |
416 | * @req: reference to the ahash_request handle that holds all information | |
417 | * needed to perform the cipher operation | |
418 | * | |
419 | * This function is a "short-hand" for the function calls of | |
560b1a82 | 420 | * crypto_ahash_update and crypto_ahash_final. The parameters have the same |
90240ffb SM |
421 | * meaning as discussed for those separate functions. |
422 | * | |
560b1a82 | 423 | * Return: see crypto_ahash_final() |
90240ffb | 424 | */ |
66f6ce5e | 425 | int crypto_ahash_finup(struct ahash_request *req); |
90240ffb SM |
426 | |
427 | /** | |
428 | * crypto_ahash_final() - calculate message digest | |
429 | * @req: reference to the ahash_request handle that holds all information | |
430 | * needed to perform the cipher operation | |
431 | * | |
432 | * Finalize the message digest operation and create the message digest | |
433 | * based on all data added to the cipher handle. The message digest is placed | |
434 | * into the output buffer registered with the ahash_request handle. | |
435 | * | |
560b1a82 KK |
436 | * Return: |
437 | * 0 if the message digest was successfully calculated; | |
438 | * -EINPROGRESS if data is feeded into hardware (DMA) or queued for later; | |
439 | * -EBUSY if queue is full and request should be resubmitted later; | |
440 | * other < 0 if an error occurred | |
90240ffb | 441 | */ |
66f6ce5e | 442 | int crypto_ahash_final(struct ahash_request *req); |
90240ffb SM |
443 | |
444 | /** | |
445 | * crypto_ahash_digest() - calculate message digest for a buffer | |
446 | * @req: reference to the ahash_request handle that holds all information | |
447 | * needed to perform the cipher operation | |
448 | * | |
449 | * This function is a "short-hand" for the function calls of crypto_ahash_init, | |
450 | * crypto_ahash_update and crypto_ahash_final. The parameters have the same | |
451 | * meaning as discussed for those separate three functions. | |
452 | * | |
560b1a82 | 453 | * Return: see crypto_ahash_final() |
90240ffb | 454 | */ |
66f6ce5e | 455 | int crypto_ahash_digest(struct ahash_request *req); |
18e33e6d | 456 | |
90240ffb SM |
457 | /** |
458 | * crypto_ahash_export() - extract current message digest state | |
459 | * @req: reference to the ahash_request handle whose state is exported | |
460 | * @out: output buffer of sufficient size that can hold the hash state | |
461 | * | |
462 | * This function exports the hash state of the ahash_request handle into the | |
463 | * caller-allocated output buffer out which must have sufficient size (e.g. by | |
379d972b | 464 | * calling crypto_ahash_statesize()). |
90240ffb SM |
465 | * |
466 | * Return: 0 if the export was successful; < 0 if an error occurred | |
467 | */ | |
88056ec3 | 468 | static inline int crypto_ahash_export(struct ahash_request *req, void *out) |
dec8b786 | 469 | { |
88056ec3 | 470 | return crypto_ahash_reqtfm(req)->export(req, out); |
dec8b786 HX |
471 | } |
472 | ||
90240ffb SM |
473 | /** |
474 | * crypto_ahash_import() - import message digest state | |
475 | * @req: reference to ahash_request handle the state is imported into | |
476 | * @in: buffer holding the state | |
477 | * | |
478 | * This function imports the hash state into the ahash_request handle from the | |
479 | * input buffer. That buffer should have been generated with the | |
480 | * crypto_ahash_export function. | |
481 | * | |
482 | * Return: 0 if the import was successful; < 0 if an error occurred | |
483 | */ | |
88056ec3 HX |
484 | static inline int crypto_ahash_import(struct ahash_request *req, const void *in) |
485 | { | |
9fa68f62 EB |
486 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
487 | ||
488 | if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
489 | return -ENOKEY; | |
490 | ||
491 | return tfm->import(req, in); | |
88056ec3 | 492 | } |
dec8b786 | 493 | |
90240ffb SM |
494 | /** |
495 | * crypto_ahash_init() - (re)initialize message digest handle | |
496 | * @req: ahash_request handle that already is initialized with all necessary | |
497 | * data using the ahash_request_* API functions | |
498 | * | |
499 | * The call (re-)initializes the message digest referenced by the ahash_request | |
500 | * handle. Any potentially existing state created by previous operations is | |
501 | * discarded. | |
502 | * | |
560b1a82 | 503 | * Return: see crypto_ahash_final() |
90240ffb | 504 | */ |
318e5313 HX |
505 | static inline int crypto_ahash_init(struct ahash_request *req) |
506 | { | |
9fa68f62 EB |
507 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
508 | ||
509 | if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
510 | return -ENOKEY; | |
511 | ||
512 | return tfm->init(req); | |
318e5313 HX |
513 | } |
514 | ||
90240ffb SM |
515 | /** |
516 | * crypto_ahash_update() - add data to message digest for processing | |
517 | * @req: ahash_request handle that was previously initialized with the | |
518 | * crypto_ahash_init call. | |
519 | * | |
520 | * Updates the message digest state of the &ahash_request handle. The input data | |
521 | * is pointed to by the scatter/gather list registered in the &ahash_request | |
522 | * handle | |
523 | * | |
560b1a82 | 524 | * Return: see crypto_ahash_final() |
90240ffb | 525 | */ |
318e5313 HX |
526 | static inline int crypto_ahash_update(struct ahash_request *req) |
527 | { | |
f7d76e05 CL |
528 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
529 | struct crypto_alg *alg = tfm->base.__crt_alg; | |
530 | unsigned int nbytes = req->nbytes; | |
cac5818c CL |
531 | int ret; |
532 | ||
f7d76e05 | 533 | crypto_stats_get(alg); |
cac5818c | 534 | ret = crypto_ahash_reqtfm(req)->update(req); |
f7d76e05 | 535 | crypto_stats_ahash_update(nbytes, ret, alg); |
cac5818c | 536 | return ret; |
318e5313 HX |
537 | } |
538 | ||
90240ffb SM |
539 | /** |
540 | * DOC: Asynchronous Hash Request Handle | |
541 | * | |
542 | * The &ahash_request data structure contains all pointers to data | |
543 | * required for the asynchronous cipher operation. This includes the cipher | |
544 | * handle (which can be used by multiple &ahash_request instances), pointer | |
545 | * to plaintext and the message digest output buffer, asynchronous callback | |
546 | * function, etc. It acts as a handle to the ahash_request_* API calls in a | |
547 | * similar way as ahash handle to the crypto_ahash_* API calls. | |
548 | */ | |
549 | ||
550 | /** | |
551 | * ahash_request_set_tfm() - update cipher handle reference in request | |
552 | * @req: request handle to be modified | |
553 | * @tfm: cipher handle that shall be added to the request handle | |
554 | * | |
555 | * Allow the caller to replace the existing ahash handle in the request | |
556 | * data structure with a different one. | |
557 | */ | |
18e33e6d HX |
558 | static inline void ahash_request_set_tfm(struct ahash_request *req, |
559 | struct crypto_ahash *tfm) | |
560 | { | |
561 | req->base.tfm = crypto_ahash_tfm(tfm); | |
562 | } | |
563 | ||
90240ffb SM |
564 | /** |
565 | * ahash_request_alloc() - allocate request data structure | |
566 | * @tfm: cipher handle to be registered with the request | |
567 | * @gfp: memory allocation flag that is handed to kmalloc by the API call. | |
568 | * | |
569 | * Allocate the request data structure that must be used with the ahash | |
570 | * message digest API calls. During | |
571 | * the allocation, the provided ahash handle | |
572 | * is registered in the request data structure. | |
573 | * | |
6eae29e7 | 574 | * Return: allocated request handle in case of success, or NULL if out of memory |
90240ffb | 575 | */ |
18e33e6d HX |
576 | static inline struct ahash_request *ahash_request_alloc( |
577 | struct crypto_ahash *tfm, gfp_t gfp) | |
578 | { | |
579 | struct ahash_request *req; | |
580 | ||
581 | req = kmalloc(sizeof(struct ahash_request) + | |
582 | crypto_ahash_reqsize(tfm), gfp); | |
583 | ||
584 | if (likely(req)) | |
585 | ahash_request_set_tfm(req, tfm); | |
586 | ||
587 | return req; | |
588 | } | |
589 | ||
90240ffb SM |
590 | /** |
591 | * ahash_request_free() - zeroize and free the request data structure | |
592 | * @req: request data structure cipher handle to be freed | |
593 | */ | |
18e33e6d HX |
594 | static inline void ahash_request_free(struct ahash_request *req) |
595 | { | |
aef73cfc | 596 | kzfree(req); |
18e33e6d HX |
597 | } |
598 | ||
e67ffe0a HX |
599 | static inline void ahash_request_zero(struct ahash_request *req) |
600 | { | |
601 | memzero_explicit(req, sizeof(*req) + | |
602 | crypto_ahash_reqsize(crypto_ahash_reqtfm(req))); | |
603 | } | |
604 | ||
18e33e6d HX |
605 | static inline struct ahash_request *ahash_request_cast( |
606 | struct crypto_async_request *req) | |
607 | { | |
608 | return container_of(req, struct ahash_request, base); | |
609 | } | |
610 | ||
90240ffb SM |
611 | /** |
612 | * ahash_request_set_callback() - set asynchronous callback function | |
613 | * @req: request handle | |
614 | * @flags: specify zero or an ORing of the flags | |
615 | * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and | |
616 | * increase the wait queue beyond the initial maximum size; | |
617 | * CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep | |
618 | * @compl: callback function pointer to be registered with the request handle | |
619 | * @data: The data pointer refers to memory that is not used by the kernel | |
620 | * crypto API, but provided to the callback function for it to use. Here, | |
621 | * the caller can provide a reference to memory the callback function can | |
622 | * operate on. As the callback function is invoked asynchronously to the | |
623 | * related functionality, it may need to access data structures of the | |
624 | * related functionality which can be referenced using this pointer. The | |
625 | * callback function can access the memory via the "data" field in the | |
626 | * &crypto_async_request data structure provided to the callback function. | |
627 | * | |
628 | * This function allows setting the callback function that is triggered once | |
629 | * the cipher operation completes. | |
630 | * | |
631 | * The callback function is registered with the &ahash_request handle and | |
0184cfe7 | 632 | * must comply with the following template:: |
90240ffb SM |
633 | * |
634 | * void callback_function(struct crypto_async_request *req, int error) | |
635 | */ | |
18e33e6d HX |
636 | static inline void ahash_request_set_callback(struct ahash_request *req, |
637 | u32 flags, | |
3e3dc25f | 638 | crypto_completion_t compl, |
18e33e6d HX |
639 | void *data) |
640 | { | |
3e3dc25f | 641 | req->base.complete = compl; |
18e33e6d HX |
642 | req->base.data = data; |
643 | req->base.flags = flags; | |
644 | } | |
645 | ||
90240ffb SM |
646 | /** |
647 | * ahash_request_set_crypt() - set data buffers | |
648 | * @req: ahash_request handle to be updated | |
649 | * @src: source scatter/gather list | |
650 | * @result: buffer that is filled with the message digest -- the caller must | |
651 | * ensure that the buffer has sufficient space by, for example, calling | |
652 | * crypto_ahash_digestsize() | |
653 | * @nbytes: number of bytes to process from the source scatter/gather list | |
654 | * | |
655 | * By using this call, the caller references the source scatter/gather list. | |
656 | * The source scatter/gather list points to the data the message digest is to | |
657 | * be calculated for. | |
658 | */ | |
18e33e6d HX |
659 | static inline void ahash_request_set_crypt(struct ahash_request *req, |
660 | struct scatterlist *src, u8 *result, | |
661 | unsigned int nbytes) | |
662 | { | |
663 | req->src = src; | |
664 | req->nbytes = nbytes; | |
665 | req->result = result; | |
666 | } | |
667 | ||
968ab291 SM |
668 | /** |
669 | * DOC: Synchronous Message Digest API | |
670 | * | |
671 | * The synchronous message digest API is used with the ciphers of type | |
672 | * CRYPTO_ALG_TYPE_SHASH (listed as type "shash" in /proc/crypto) | |
673 | * | |
674 | * The message digest API is able to maintain state information for the | |
675 | * caller. | |
676 | * | |
677 | * The synchronous message digest API can store user-related context in in its | |
678 | * shash_desc request data structure. | |
679 | */ | |
680 | ||
681 | /** | |
682 | * crypto_alloc_shash() - allocate message digest handle | |
683 | * @alg_name: is the cra_name / name or cra_driver_name / driver name of the | |
684 | * message digest cipher | |
685 | * @type: specifies the type of the cipher | |
686 | * @mask: specifies the mask for the cipher | |
687 | * | |
688 | * Allocate a cipher handle for a message digest. The returned &struct | |
689 | * crypto_shash is the cipher handle that is required for any subsequent | |
690 | * API invocation for that message digest. | |
691 | * | |
692 | * Return: allocated cipher handle in case of success; IS_ERR() is true in case | |
693 | * of an error, PTR_ERR() returns the error code. | |
694 | */ | |
7b5a080b HX |
695 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, |
696 | u32 mask); | |
697 | ||
698 | static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm) | |
699 | { | |
700 | return &tfm->base; | |
701 | } | |
702 | ||
968ab291 SM |
703 | /** |
704 | * crypto_free_shash() - zeroize and free the message digest handle | |
705 | * @tfm: cipher handle to be freed | |
706 | */ | |
7b5a080b HX |
707 | static inline void crypto_free_shash(struct crypto_shash *tfm) |
708 | { | |
412e87ae | 709 | crypto_destroy_tfm(tfm, crypto_shash_tfm(tfm)); |
7b5a080b HX |
710 | } |
711 | ||
d12481bc HX |
712 | static inline const char *crypto_shash_alg_name(struct crypto_shash *tfm) |
713 | { | |
714 | return crypto_tfm_alg_name(crypto_shash_tfm(tfm)); | |
715 | } | |
716 | ||
717 | static inline const char *crypto_shash_driver_name(struct crypto_shash *tfm) | |
718 | { | |
719 | return crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm)); | |
720 | } | |
721 | ||
7b5a080b HX |
722 | static inline unsigned int crypto_shash_alignmask( |
723 | struct crypto_shash *tfm) | |
724 | { | |
725 | return crypto_tfm_alg_alignmask(crypto_shash_tfm(tfm)); | |
726 | } | |
727 | ||
968ab291 SM |
728 | /** |
729 | * crypto_shash_blocksize() - obtain block size for cipher | |
730 | * @tfm: cipher handle | |
731 | * | |
732 | * The block size for the message digest cipher referenced with the cipher | |
733 | * handle is returned. | |
734 | * | |
735 | * Return: block size of cipher | |
736 | */ | |
97495986 HX |
737 | static inline unsigned int crypto_shash_blocksize(struct crypto_shash *tfm) |
738 | { | |
739 | return crypto_tfm_alg_blocksize(crypto_shash_tfm(tfm)); | |
740 | } | |
741 | ||
7b5a080b HX |
742 | static inline struct shash_alg *__crypto_shash_alg(struct crypto_alg *alg) |
743 | { | |
744 | return container_of(alg, struct shash_alg, base); | |
745 | } | |
746 | ||
747 | static inline struct shash_alg *crypto_shash_alg(struct crypto_shash *tfm) | |
748 | { | |
749 | return __crypto_shash_alg(crypto_shash_tfm(tfm)->__crt_alg); | |
750 | } | |
751 | ||
968ab291 SM |
752 | /** |
753 | * crypto_shash_digestsize() - obtain message digest size | |
754 | * @tfm: cipher handle | |
755 | * | |
756 | * The size for the message digest created by the message digest cipher | |
757 | * referenced with the cipher handle is returned. | |
758 | * | |
759 | * Return: digest size of cipher | |
760 | */ | |
7b5a080b HX |
761 | static inline unsigned int crypto_shash_digestsize(struct crypto_shash *tfm) |
762 | { | |
763 | return crypto_shash_alg(tfm)->digestsize; | |
764 | } | |
765 | ||
99d27e1c HX |
766 | static inline unsigned int crypto_shash_statesize(struct crypto_shash *tfm) |
767 | { | |
768 | return crypto_shash_alg(tfm)->statesize; | |
769 | } | |
770 | ||
7b5a080b HX |
771 | static inline u32 crypto_shash_get_flags(struct crypto_shash *tfm) |
772 | { | |
773 | return crypto_tfm_get_flags(crypto_shash_tfm(tfm)); | |
774 | } | |
775 | ||
776 | static inline void crypto_shash_set_flags(struct crypto_shash *tfm, u32 flags) | |
777 | { | |
778 | crypto_tfm_set_flags(crypto_shash_tfm(tfm), flags); | |
779 | } | |
780 | ||
781 | static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags) | |
782 | { | |
783 | crypto_tfm_clear_flags(crypto_shash_tfm(tfm), flags); | |
784 | } | |
785 | ||
968ab291 SM |
786 | /** |
787 | * crypto_shash_descsize() - obtain the operational state size | |
788 | * @tfm: cipher handle | |
789 | * | |
790 | * The size of the operational state the cipher needs during operation is | |
791 | * returned for the hash referenced with the cipher handle. This size is | |
792 | * required to calculate the memory requirements to allow the caller allocating | |
793 | * sufficient memory for operational state. | |
794 | * | |
795 | * The operational state is defined with struct shash_desc where the size of | |
796 | * that data structure is to be calculated as | |
797 | * sizeof(struct shash_desc) + crypto_shash_descsize(alg) | |
798 | * | |
799 | * Return: size of the operational state | |
800 | */ | |
7b5a080b HX |
801 | static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm) |
802 | { | |
113adefc | 803 | return tfm->descsize; |
7b5a080b HX |
804 | } |
805 | ||
806 | static inline void *shash_desc_ctx(struct shash_desc *desc) | |
807 | { | |
808 | return desc->__ctx; | |
809 | } | |
810 | ||
968ab291 SM |
811 | /** |
812 | * crypto_shash_setkey() - set key for message digest | |
813 | * @tfm: cipher handle | |
814 | * @key: buffer holding the key | |
815 | * @keylen: length of the key in bytes | |
816 | * | |
817 | * The caller provided key is set for the keyed message digest cipher. The | |
818 | * cipher handle must point to a keyed message digest cipher in order for this | |
819 | * function to succeed. | |
820 | * | |
877b5691 | 821 | * Context: Any context. |
968ab291 SM |
822 | * Return: 0 if the setting of the key was successful; < 0 if an error occurred |
823 | */ | |
7b5a080b HX |
824 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, |
825 | unsigned int keylen); | |
968ab291 SM |
826 | |
827 | /** | |
828 | * crypto_shash_digest() - calculate message digest for buffer | |
829 | * @desc: see crypto_shash_final() | |
830 | * @data: see crypto_shash_update() | |
831 | * @len: see crypto_shash_update() | |
832 | * @out: see crypto_shash_final() | |
833 | * | |
834 | * This function is a "short-hand" for the function calls of crypto_shash_init, | |
835 | * crypto_shash_update and crypto_shash_final. The parameters have the same | |
836 | * meaning as discussed for those separate three functions. | |
837 | * | |
877b5691 | 838 | * Context: Any context. |
968ab291 SM |
839 | * Return: 0 if the message digest creation was successful; < 0 if an error |
840 | * occurred | |
841 | */ | |
7b5a080b HX |
842 | int crypto_shash_digest(struct shash_desc *desc, const u8 *data, |
843 | unsigned int len, u8 *out); | |
844 | ||
968ab291 SM |
845 | /** |
846 | * crypto_shash_export() - extract operational state for message digest | |
847 | * @desc: reference to the operational state handle whose state is exported | |
848 | * @out: output buffer of sufficient size that can hold the hash state | |
849 | * | |
850 | * This function exports the hash state of the operational state handle into the | |
851 | * caller-allocated output buffer out which must have sufficient size (e.g. by | |
852 | * calling crypto_shash_descsize). | |
853 | * | |
877b5691 | 854 | * Context: Any context. |
968ab291 SM |
855 | * Return: 0 if the export creation was successful; < 0 if an error occurred |
856 | */ | |
99d27e1c | 857 | static inline int crypto_shash_export(struct shash_desc *desc, void *out) |
dec8b786 | 858 | { |
99d27e1c | 859 | return crypto_shash_alg(desc->tfm)->export(desc, out); |
dec8b786 HX |
860 | } |
861 | ||
968ab291 SM |
862 | /** |
863 | * crypto_shash_import() - import operational state | |
864 | * @desc: reference to the operational state handle the state imported into | |
865 | * @in: buffer holding the state | |
866 | * | |
867 | * This function imports the hash state into the operational state handle from | |
868 | * the input buffer. That buffer should have been generated with the | |
869 | * crypto_ahash_export function. | |
870 | * | |
877b5691 | 871 | * Context: Any context. |
968ab291 SM |
872 | * Return: 0 if the import was successful; < 0 if an error occurred |
873 | */ | |
99d27e1c HX |
874 | static inline int crypto_shash_import(struct shash_desc *desc, const void *in) |
875 | { | |
9fa68f62 EB |
876 | struct crypto_shash *tfm = desc->tfm; |
877 | ||
878 | if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
879 | return -ENOKEY; | |
880 | ||
881 | return crypto_shash_alg(tfm)->import(desc, in); | |
99d27e1c | 882 | } |
dec8b786 | 883 | |
968ab291 SM |
884 | /** |
885 | * crypto_shash_init() - (re)initialize message digest | |
886 | * @desc: operational state handle that is already filled | |
887 | * | |
888 | * The call (re-)initializes the message digest referenced by the | |
889 | * operational state handle. Any potentially existing state created by | |
890 | * previous operations is discarded. | |
891 | * | |
877b5691 | 892 | * Context: Any context. |
968ab291 SM |
893 | * Return: 0 if the message digest initialization was successful; < 0 if an |
894 | * error occurred | |
895 | */ | |
7b5a080b HX |
896 | static inline int crypto_shash_init(struct shash_desc *desc) |
897 | { | |
9fa68f62 EB |
898 | struct crypto_shash *tfm = desc->tfm; |
899 | ||
900 | if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
901 | return -ENOKEY; | |
902 | ||
903 | return crypto_shash_alg(tfm)->init(desc); | |
7b5a080b HX |
904 | } |
905 | ||
968ab291 SM |
906 | /** |
907 | * crypto_shash_update() - add data to message digest for processing | |
908 | * @desc: operational state handle that is already initialized | |
909 | * @data: input data to be added to the message digest | |
910 | * @len: length of the input data | |
911 | * | |
912 | * Updates the message digest state of the operational state handle. | |
913 | * | |
877b5691 | 914 | * Context: Any context. |
968ab291 SM |
915 | * Return: 0 if the message digest update was successful; < 0 if an error |
916 | * occurred | |
917 | */ | |
7b5a080b HX |
918 | int crypto_shash_update(struct shash_desc *desc, const u8 *data, |
919 | unsigned int len); | |
968ab291 SM |
920 | |
921 | /** | |
922 | * crypto_shash_final() - calculate message digest | |
923 | * @desc: operational state handle that is already filled with data | |
924 | * @out: output buffer filled with the message digest | |
925 | * | |
926 | * Finalize the message digest operation and create the message digest | |
927 | * based on all data added to the cipher handle. The message digest is placed | |
928 | * into the output buffer. The caller must ensure that the output buffer is | |
929 | * large enough by using crypto_shash_digestsize. | |
930 | * | |
877b5691 | 931 | * Context: Any context. |
968ab291 SM |
932 | * Return: 0 if the message digest creation was successful; < 0 if an error |
933 | * occurred | |
934 | */ | |
7b5a080b | 935 | int crypto_shash_final(struct shash_desc *desc, u8 *out); |
968ab291 SM |
936 | |
937 | /** | |
938 | * crypto_shash_finup() - calculate message digest of buffer | |
939 | * @desc: see crypto_shash_final() | |
940 | * @data: see crypto_shash_update() | |
941 | * @len: see crypto_shash_update() | |
942 | * @out: see crypto_shash_final() | |
943 | * | |
944 | * This function is a "short-hand" for the function calls of | |
945 | * crypto_shash_update and crypto_shash_final. The parameters have the same | |
946 | * meaning as discussed for those separate functions. | |
947 | * | |
877b5691 | 948 | * Context: Any context. |
968ab291 SM |
949 | * Return: 0 if the message digest creation was successful; < 0 if an error |
950 | * occurred | |
951 | */ | |
7b5a080b HX |
952 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data, |
953 | unsigned int len, u8 *out); | |
954 | ||
e67ffe0a HX |
955 | static inline void shash_desc_zero(struct shash_desc *desc) |
956 | { | |
957 | memzero_explicit(desc, | |
958 | sizeof(*desc) + crypto_shash_descsize(desc->tfm)); | |
959 | } | |
960 | ||
18e33e6d | 961 | #endif /* _CRYPTO_HASH_H */ |