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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * Shared crypto simd helpers | |
4 | * | |
5 | * Copyright (c) 2012 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | |
6 | * Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au> | |
7 | * Copyright (c) 2019 Google LLC | |
8 | * | |
9 | * Based on aesni-intel_glue.c by: | |
10 | * Copyright (C) 2008, Intel Corp. | |
11 | * Author: Huang Ying <ying.huang@intel.com> | |
12 | */ | |
13 | ||
14 | /* | |
15 | * Shared crypto SIMD helpers. These functions dynamically create and register | |
16 | * an skcipher or AEAD algorithm that wraps another, internal algorithm. The | |
17 | * wrapper ensures that the internal algorithm is only executed in a context | |
18 | * where SIMD instructions are usable, i.e. where may_use_simd() returns true. | |
19 | * If SIMD is already usable, the wrapper directly calls the internal algorithm. | |
20 | * Otherwise it defers execution to a workqueue via cryptd. | |
21 | * | |
22 | * This is an alternative to the internal algorithm implementing a fallback for | |
23 | * the !may_use_simd() case itself. | |
24 | * | |
25 | * Note that the wrapper algorithm is asynchronous, i.e. it has the | |
26 | * CRYPTO_ALG_ASYNC flag set. Therefore it won't be found by users who | |
27 | * explicitly allocate a synchronous algorithm. | |
28 | */ | |
29 | ||
30 | #include <crypto/cryptd.h> | |
31 | #include <crypto/internal/aead.h> | |
32 | #include <crypto/internal/simd.h> | |
33 | #include <crypto/internal/skcipher.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/preempt.h> | |
37 | #include <asm/simd.h> | |
38 | ||
39 | /* skcipher support */ | |
40 | ||
41 | struct simd_skcipher_alg { | |
42 | const char *ialg_name; | |
43 | struct skcipher_alg alg; | |
44 | }; | |
45 | ||
46 | struct simd_skcipher_ctx { | |
47 | struct cryptd_skcipher *cryptd_tfm; | |
48 | }; | |
49 | ||
50 | static int simd_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, | |
51 | unsigned int key_len) | |
52 | { | |
53 | struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); | |
54 | struct crypto_skcipher *child = &ctx->cryptd_tfm->base; | |
55 | ||
56 | crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
57 | crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(tfm) & | |
58 | CRYPTO_TFM_REQ_MASK); | |
59 | return crypto_skcipher_setkey(child, key, key_len); | |
60 | } | |
61 | ||
62 | static int simd_skcipher_encrypt(struct skcipher_request *req) | |
63 | { | |
64 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
65 | struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); | |
66 | struct skcipher_request *subreq; | |
67 | struct crypto_skcipher *child; | |
68 | ||
69 | subreq = skcipher_request_ctx(req); | |
70 | *subreq = *req; | |
71 | ||
72 | if (!crypto_simd_usable() || | |
73 | (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm))) | |
74 | child = &ctx->cryptd_tfm->base; | |
75 | else | |
76 | child = cryptd_skcipher_child(ctx->cryptd_tfm); | |
77 | ||
78 | skcipher_request_set_tfm(subreq, child); | |
79 | ||
80 | return crypto_skcipher_encrypt(subreq); | |
81 | } | |
82 | ||
83 | static int simd_skcipher_decrypt(struct skcipher_request *req) | |
84 | { | |
85 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
86 | struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); | |
87 | struct skcipher_request *subreq; | |
88 | struct crypto_skcipher *child; | |
89 | ||
90 | subreq = skcipher_request_ctx(req); | |
91 | *subreq = *req; | |
92 | ||
93 | if (!crypto_simd_usable() || | |
94 | (in_atomic() && cryptd_skcipher_queued(ctx->cryptd_tfm))) | |
95 | child = &ctx->cryptd_tfm->base; | |
96 | else | |
97 | child = cryptd_skcipher_child(ctx->cryptd_tfm); | |
98 | ||
99 | skcipher_request_set_tfm(subreq, child); | |
100 | ||
101 | return crypto_skcipher_decrypt(subreq); | |
102 | } | |
103 | ||
104 | static void simd_skcipher_exit(struct crypto_skcipher *tfm) | |
105 | { | |
106 | struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); | |
107 | ||
108 | cryptd_free_skcipher(ctx->cryptd_tfm); | |
109 | } | |
110 | ||
111 | static int simd_skcipher_init(struct crypto_skcipher *tfm) | |
112 | { | |
113 | struct simd_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); | |
114 | struct cryptd_skcipher *cryptd_tfm; | |
115 | struct simd_skcipher_alg *salg; | |
116 | struct skcipher_alg *alg; | |
117 | unsigned reqsize; | |
118 | ||
119 | alg = crypto_skcipher_alg(tfm); | |
120 | salg = container_of(alg, struct simd_skcipher_alg, alg); | |
121 | ||
122 | cryptd_tfm = cryptd_alloc_skcipher(salg->ialg_name, | |
123 | CRYPTO_ALG_INTERNAL, | |
124 | CRYPTO_ALG_INTERNAL); | |
125 | if (IS_ERR(cryptd_tfm)) | |
126 | return PTR_ERR(cryptd_tfm); | |
127 | ||
128 | ctx->cryptd_tfm = cryptd_tfm; | |
129 | ||
130 | reqsize = crypto_skcipher_reqsize(cryptd_skcipher_child(cryptd_tfm)); | |
131 | reqsize = max(reqsize, crypto_skcipher_reqsize(&cryptd_tfm->base)); | |
132 | reqsize += sizeof(struct skcipher_request); | |
133 | ||
134 | crypto_skcipher_set_reqsize(tfm, reqsize); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | struct simd_skcipher_alg *simd_skcipher_create_compat(const char *algname, | |
140 | const char *drvname, | |
141 | const char *basename) | |
142 | { | |
143 | struct simd_skcipher_alg *salg; | |
144 | struct crypto_skcipher *tfm; | |
145 | struct skcipher_alg *ialg; | |
146 | struct skcipher_alg *alg; | |
147 | int err; | |
148 | ||
149 | tfm = crypto_alloc_skcipher(basename, CRYPTO_ALG_INTERNAL, | |
150 | CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC); | |
151 | if (IS_ERR(tfm)) | |
152 | return ERR_CAST(tfm); | |
153 | ||
154 | ialg = crypto_skcipher_alg(tfm); | |
155 | ||
156 | salg = kzalloc(sizeof(*salg), GFP_KERNEL); | |
157 | if (!salg) { | |
158 | salg = ERR_PTR(-ENOMEM); | |
159 | goto out_put_tfm; | |
160 | } | |
161 | ||
162 | salg->ialg_name = basename; | |
163 | alg = &salg->alg; | |
164 | ||
165 | err = -ENAMETOOLONG; | |
166 | if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >= | |
167 | CRYPTO_MAX_ALG_NAME) | |
168 | goto out_free_salg; | |
169 | ||
170 | if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", | |
171 | drvname) >= CRYPTO_MAX_ALG_NAME) | |
172 | goto out_free_salg; | |
173 | ||
174 | alg->base.cra_flags = CRYPTO_ALG_ASYNC; | |
175 | alg->base.cra_priority = ialg->base.cra_priority; | |
176 | alg->base.cra_blocksize = ialg->base.cra_blocksize; | |
177 | alg->base.cra_alignmask = ialg->base.cra_alignmask; | |
178 | alg->base.cra_module = ialg->base.cra_module; | |
179 | alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx); | |
180 | ||
181 | alg->ivsize = ialg->ivsize; | |
182 | alg->chunksize = ialg->chunksize; | |
183 | alg->min_keysize = ialg->min_keysize; | |
184 | alg->max_keysize = ialg->max_keysize; | |
185 | ||
186 | alg->init = simd_skcipher_init; | |
187 | alg->exit = simd_skcipher_exit; | |
188 | ||
189 | alg->setkey = simd_skcipher_setkey; | |
190 | alg->encrypt = simd_skcipher_encrypt; | |
191 | alg->decrypt = simd_skcipher_decrypt; | |
192 | ||
193 | err = crypto_register_skcipher(alg); | |
194 | if (err) | |
195 | goto out_free_salg; | |
196 | ||
197 | out_put_tfm: | |
198 | crypto_free_skcipher(tfm); | |
199 | return salg; | |
200 | ||
201 | out_free_salg: | |
202 | kfree(salg); | |
203 | salg = ERR_PTR(err); | |
204 | goto out_put_tfm; | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(simd_skcipher_create_compat); | |
207 | ||
208 | struct simd_skcipher_alg *simd_skcipher_create(const char *algname, | |
209 | const char *basename) | |
210 | { | |
211 | char drvname[CRYPTO_MAX_ALG_NAME]; | |
212 | ||
213 | if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >= | |
214 | CRYPTO_MAX_ALG_NAME) | |
215 | return ERR_PTR(-ENAMETOOLONG); | |
216 | ||
217 | return simd_skcipher_create_compat(algname, drvname, basename); | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(simd_skcipher_create); | |
220 | ||
221 | void simd_skcipher_free(struct simd_skcipher_alg *salg) | |
222 | { | |
223 | crypto_unregister_skcipher(&salg->alg); | |
224 | kfree(salg); | |
225 | } | |
226 | EXPORT_SYMBOL_GPL(simd_skcipher_free); | |
227 | ||
228 | int simd_register_skciphers_compat(struct skcipher_alg *algs, int count, | |
229 | struct simd_skcipher_alg **simd_algs) | |
230 | { | |
231 | int err; | |
232 | int i; | |
233 | const char *algname; | |
234 | const char *drvname; | |
235 | const char *basename; | |
236 | struct simd_skcipher_alg *simd; | |
237 | ||
238 | err = crypto_register_skciphers(algs, count); | |
239 | if (err) | |
240 | return err; | |
241 | ||
242 | for (i = 0; i < count; i++) { | |
243 | WARN_ON(strncmp(algs[i].base.cra_name, "__", 2)); | |
244 | WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2)); | |
245 | algname = algs[i].base.cra_name + 2; | |
246 | drvname = algs[i].base.cra_driver_name + 2; | |
247 | basename = algs[i].base.cra_driver_name; | |
248 | simd = simd_skcipher_create_compat(algname, drvname, basename); | |
249 | err = PTR_ERR(simd); | |
250 | if (IS_ERR(simd)) | |
251 | goto err_unregister; | |
252 | simd_algs[i] = simd; | |
253 | } | |
254 | return 0; | |
255 | ||
256 | err_unregister: | |
257 | simd_unregister_skciphers(algs, count, simd_algs); | |
258 | return err; | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(simd_register_skciphers_compat); | |
261 | ||
262 | void simd_unregister_skciphers(struct skcipher_alg *algs, int count, | |
263 | struct simd_skcipher_alg **simd_algs) | |
264 | { | |
265 | int i; | |
266 | ||
267 | crypto_unregister_skciphers(algs, count); | |
268 | ||
269 | for (i = 0; i < count; i++) { | |
270 | if (simd_algs[i]) { | |
271 | simd_skcipher_free(simd_algs[i]); | |
272 | simd_algs[i] = NULL; | |
273 | } | |
274 | } | |
275 | } | |
276 | EXPORT_SYMBOL_GPL(simd_unregister_skciphers); | |
277 | ||
278 | /* AEAD support */ | |
279 | ||
280 | struct simd_aead_alg { | |
281 | const char *ialg_name; | |
282 | struct aead_alg alg; | |
283 | }; | |
284 | ||
285 | struct simd_aead_ctx { | |
286 | struct cryptd_aead *cryptd_tfm; | |
287 | }; | |
288 | ||
289 | static int simd_aead_setkey(struct crypto_aead *tfm, const u8 *key, | |
290 | unsigned int key_len) | |
291 | { | |
292 | struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
293 | struct crypto_aead *child = &ctx->cryptd_tfm->base; | |
294 | ||
295 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
296 | crypto_aead_set_flags(child, crypto_aead_get_flags(tfm) & | |
297 | CRYPTO_TFM_REQ_MASK); | |
298 | return crypto_aead_setkey(child, key, key_len); | |
299 | } | |
300 | ||
301 | static int simd_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize) | |
302 | { | |
303 | struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
304 | struct crypto_aead *child = &ctx->cryptd_tfm->base; | |
305 | ||
306 | return crypto_aead_setauthsize(child, authsize); | |
307 | } | |
308 | ||
309 | static int simd_aead_encrypt(struct aead_request *req) | |
310 | { | |
311 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
312 | struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
313 | struct aead_request *subreq; | |
314 | struct crypto_aead *child; | |
315 | ||
316 | subreq = aead_request_ctx(req); | |
317 | *subreq = *req; | |
318 | ||
319 | if (!crypto_simd_usable() || | |
320 | (in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm))) | |
321 | child = &ctx->cryptd_tfm->base; | |
322 | else | |
323 | child = cryptd_aead_child(ctx->cryptd_tfm); | |
324 | ||
325 | aead_request_set_tfm(subreq, child); | |
326 | ||
327 | return crypto_aead_encrypt(subreq); | |
328 | } | |
329 | ||
330 | static int simd_aead_decrypt(struct aead_request *req) | |
331 | { | |
332 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
333 | struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
334 | struct aead_request *subreq; | |
335 | struct crypto_aead *child; | |
336 | ||
337 | subreq = aead_request_ctx(req); | |
338 | *subreq = *req; | |
339 | ||
340 | if (!crypto_simd_usable() || | |
341 | (in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm))) | |
342 | child = &ctx->cryptd_tfm->base; | |
343 | else | |
344 | child = cryptd_aead_child(ctx->cryptd_tfm); | |
345 | ||
346 | aead_request_set_tfm(subreq, child); | |
347 | ||
348 | return crypto_aead_decrypt(subreq); | |
349 | } | |
350 | ||
351 | static void simd_aead_exit(struct crypto_aead *tfm) | |
352 | { | |
353 | struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
354 | ||
355 | cryptd_free_aead(ctx->cryptd_tfm); | |
356 | } | |
357 | ||
358 | static int simd_aead_init(struct crypto_aead *tfm) | |
359 | { | |
360 | struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
361 | struct cryptd_aead *cryptd_tfm; | |
362 | struct simd_aead_alg *salg; | |
363 | struct aead_alg *alg; | |
364 | unsigned reqsize; | |
365 | ||
366 | alg = crypto_aead_alg(tfm); | |
367 | salg = container_of(alg, struct simd_aead_alg, alg); | |
368 | ||
369 | cryptd_tfm = cryptd_alloc_aead(salg->ialg_name, CRYPTO_ALG_INTERNAL, | |
370 | CRYPTO_ALG_INTERNAL); | |
371 | if (IS_ERR(cryptd_tfm)) | |
372 | return PTR_ERR(cryptd_tfm); | |
373 | ||
374 | ctx->cryptd_tfm = cryptd_tfm; | |
375 | ||
376 | reqsize = crypto_aead_reqsize(cryptd_aead_child(cryptd_tfm)); | |
377 | reqsize = max(reqsize, crypto_aead_reqsize(&cryptd_tfm->base)); | |
378 | reqsize += sizeof(struct aead_request); | |
379 | ||
380 | crypto_aead_set_reqsize(tfm, reqsize); | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | struct simd_aead_alg *simd_aead_create_compat(const char *algname, | |
386 | const char *drvname, | |
387 | const char *basename) | |
388 | { | |
389 | struct simd_aead_alg *salg; | |
390 | struct crypto_aead *tfm; | |
391 | struct aead_alg *ialg; | |
392 | struct aead_alg *alg; | |
393 | int err; | |
394 | ||
395 | tfm = crypto_alloc_aead(basename, CRYPTO_ALG_INTERNAL, | |
396 | CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC); | |
397 | if (IS_ERR(tfm)) | |
398 | return ERR_CAST(tfm); | |
399 | ||
400 | ialg = crypto_aead_alg(tfm); | |
401 | ||
402 | salg = kzalloc(sizeof(*salg), GFP_KERNEL); | |
403 | if (!salg) { | |
404 | salg = ERR_PTR(-ENOMEM); | |
405 | goto out_put_tfm; | |
406 | } | |
407 | ||
408 | salg->ialg_name = basename; | |
409 | alg = &salg->alg; | |
410 | ||
411 | err = -ENAMETOOLONG; | |
412 | if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >= | |
413 | CRYPTO_MAX_ALG_NAME) | |
414 | goto out_free_salg; | |
415 | ||
416 | if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", | |
417 | drvname) >= CRYPTO_MAX_ALG_NAME) | |
418 | goto out_free_salg; | |
419 | ||
420 | alg->base.cra_flags = CRYPTO_ALG_ASYNC; | |
421 | alg->base.cra_priority = ialg->base.cra_priority; | |
422 | alg->base.cra_blocksize = ialg->base.cra_blocksize; | |
423 | alg->base.cra_alignmask = ialg->base.cra_alignmask; | |
424 | alg->base.cra_module = ialg->base.cra_module; | |
425 | alg->base.cra_ctxsize = sizeof(struct simd_aead_ctx); | |
426 | ||
427 | alg->ivsize = ialg->ivsize; | |
428 | alg->maxauthsize = ialg->maxauthsize; | |
429 | alg->chunksize = ialg->chunksize; | |
430 | ||
431 | alg->init = simd_aead_init; | |
432 | alg->exit = simd_aead_exit; | |
433 | ||
434 | alg->setkey = simd_aead_setkey; | |
435 | alg->setauthsize = simd_aead_setauthsize; | |
436 | alg->encrypt = simd_aead_encrypt; | |
437 | alg->decrypt = simd_aead_decrypt; | |
438 | ||
439 | err = crypto_register_aead(alg); | |
440 | if (err) | |
441 | goto out_free_salg; | |
442 | ||
443 | out_put_tfm: | |
444 | crypto_free_aead(tfm); | |
445 | return salg; | |
446 | ||
447 | out_free_salg: | |
448 | kfree(salg); | |
449 | salg = ERR_PTR(err); | |
450 | goto out_put_tfm; | |
451 | } | |
452 | EXPORT_SYMBOL_GPL(simd_aead_create_compat); | |
453 | ||
454 | struct simd_aead_alg *simd_aead_create(const char *algname, | |
455 | const char *basename) | |
456 | { | |
457 | char drvname[CRYPTO_MAX_ALG_NAME]; | |
458 | ||
459 | if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >= | |
460 | CRYPTO_MAX_ALG_NAME) | |
461 | return ERR_PTR(-ENAMETOOLONG); | |
462 | ||
463 | return simd_aead_create_compat(algname, drvname, basename); | |
464 | } | |
465 | EXPORT_SYMBOL_GPL(simd_aead_create); | |
466 | ||
467 | void simd_aead_free(struct simd_aead_alg *salg) | |
468 | { | |
469 | crypto_unregister_aead(&salg->alg); | |
470 | kfree(salg); | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(simd_aead_free); | |
473 | ||
474 | int simd_register_aeads_compat(struct aead_alg *algs, int count, | |
475 | struct simd_aead_alg **simd_algs) | |
476 | { | |
477 | int err; | |
478 | int i; | |
479 | const char *algname; | |
480 | const char *drvname; | |
481 | const char *basename; | |
482 | struct simd_aead_alg *simd; | |
483 | ||
484 | err = crypto_register_aeads(algs, count); | |
485 | if (err) | |
486 | return err; | |
487 | ||
488 | for (i = 0; i < count; i++) { | |
489 | WARN_ON(strncmp(algs[i].base.cra_name, "__", 2)); | |
490 | WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2)); | |
491 | algname = algs[i].base.cra_name + 2; | |
492 | drvname = algs[i].base.cra_driver_name + 2; | |
493 | basename = algs[i].base.cra_driver_name; | |
494 | simd = simd_aead_create_compat(algname, drvname, basename); | |
495 | err = PTR_ERR(simd); | |
496 | if (IS_ERR(simd)) | |
497 | goto err_unregister; | |
498 | simd_algs[i] = simd; | |
499 | } | |
500 | return 0; | |
501 | ||
502 | err_unregister: | |
503 | simd_unregister_aeads(algs, count, simd_algs); | |
504 | return err; | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(simd_register_aeads_compat); | |
507 | ||
508 | void simd_unregister_aeads(struct aead_alg *algs, int count, | |
509 | struct simd_aead_alg **simd_algs) | |
510 | { | |
511 | int i; | |
512 | ||
513 | crypto_unregister_aeads(algs, count); | |
514 | ||
515 | for (i = 0; i < count; i++) { | |
516 | if (simd_algs[i]) { | |
517 | simd_aead_free(simd_algs[i]); | |
518 | simd_algs[i] = NULL; | |
519 | } | |
520 | } | |
521 | } | |
522 | EXPORT_SYMBOL_GPL(simd_unregister_aeads); | |
523 | ||
524 | MODULE_LICENSE("GPL"); |