crypto/simd.c

   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                 (ialg->base.cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
 176         alg->base.cra_priority = ialg->base.cra_priority;
 177         alg->base.cra_blocksize = ialg->base.cra_blocksize;
 178         alg->base.cra_alignmask = ialg->base.cra_alignmask;
 179         alg->base.cra_module = ialg->base.cra_module;
 180         alg->base.cra_ctxsize = sizeof(struct simd_skcipher_ctx);
 181
 182         alg->ivsize = ialg->ivsize;
 183         alg->chunksize = ialg->chunksize;
 184         alg->min_keysize = ialg->min_keysize;
 185         alg->max_keysize = ialg->max_keysize;
 186
 187         alg->init = simd_skcipher_init;
 188         alg->exit = simd_skcipher_exit;
 189
 190         alg->setkey = simd_skcipher_setkey;
 191         alg->encrypt = simd_skcipher_encrypt;
 192         alg->decrypt = simd_skcipher_decrypt;
 193
 194         err = crypto_register_skcipher(alg);
 195         if (err)
 196                 goto out_free_salg;
 197
 198 out_put_tfm:
 199         crypto_free_skcipher(tfm);
 200         return salg;
 201
 202 out_free_salg:
 203         kfree(salg);
 204         salg = ERR_PTR(err);
 205         goto out_put_tfm;
 206 }
 207 EXPORT_SYMBOL_GPL(simd_skcipher_create_compat);
 208
 209 struct simd_skcipher_alg *simd_skcipher_create(const char *algname,
 210                                                const char *basename)
 211 {
 212         char drvname[CRYPTO_MAX_ALG_NAME];
 213
 214         if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
 215             CRYPTO_MAX_ALG_NAME)
 216                 return ERR_PTR(-ENAMETOOLONG);
 217
 218         return simd_skcipher_create_compat(algname, drvname, basename);
 219 }
 220 EXPORT_SYMBOL_GPL(simd_skcipher_create);
 221
 222 void simd_skcipher_free(struct simd_skcipher_alg *salg)
 223 {
 224         crypto_unregister_skcipher(&salg->alg);
 225         kfree(salg);
 226 }
 227 EXPORT_SYMBOL_GPL(simd_skcipher_free);
 228
 229 int simd_register_skciphers_compat(struct skcipher_alg *algs, int count,
 230                                    struct simd_skcipher_alg **simd_algs)
 231 {
 232         int err;
 233         int i;
 234         const char *algname;
 235         const char *drvname;
 236         const char *basename;
 237         struct simd_skcipher_alg *simd;
 238
 239         err = crypto_register_skciphers(algs, count);
 240         if (err)
 241                 return err;
 242
 243         for (i = 0; i < count; i++) {
 244                 WARN_ON(strncmp(algs[i].base.cra_name, "__", 2));
 245                 WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2));
 246                 algname = algs[i].base.cra_name + 2;
 247                 drvname = algs[i].base.cra_driver_name + 2;
 248                 basename = algs[i].base.cra_driver_name;
 249                 simd = simd_skcipher_create_compat(algname, drvname, basename);
 250                 err = PTR_ERR(simd);
 251                 if (IS_ERR(simd))
 252                         goto err_unregister;
 253                 simd_algs[i] = simd;
 254         }
 255         return 0;
 256
 257 err_unregister:
 258         simd_unregister_skciphers(algs, count, simd_algs);
 259         return err;
 260 }
 261 EXPORT_SYMBOL_GPL(simd_register_skciphers_compat);
 262
 263 void simd_unregister_skciphers(struct skcipher_alg *algs, int count,
 264                                struct simd_skcipher_alg **simd_algs)
 265 {
 266         int i;
 267
 268         crypto_unregister_skciphers(algs, count);
 269
 270         for (i = 0; i < count; i++) {
 271                 if (simd_algs[i]) {
 272                         simd_skcipher_free(simd_algs[i]);
 273                         simd_algs[i] = NULL;
 274                 }
 275         }
 276 }
 277 EXPORT_SYMBOL_GPL(simd_unregister_skciphers);
 278
 279 /* AEAD support */
 280
 281 struct simd_aead_alg {
 282         const char *ialg_name;
 283         struct aead_alg alg;
 284 };
 285
 286 struct simd_aead_ctx {
 287         struct cryptd_aead *cryptd_tfm;
 288 };
 289
 290 static int simd_aead_setkey(struct crypto_aead *tfm, const u8 *key,
 291                                 unsigned int key_len)
 292 {
 293         struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 294         struct crypto_aead *child = &ctx->cryptd_tfm->base;
 295
 296         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 297         crypto_aead_set_flags(child, crypto_aead_get_flags(tfm) &
 298                                      CRYPTO_TFM_REQ_MASK);
 299         return crypto_aead_setkey(child, key, key_len);
 300 }
 301
 302 static int simd_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 303 {
 304         struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 305         struct crypto_aead *child = &ctx->cryptd_tfm->base;
 306
 307         return crypto_aead_setauthsize(child, authsize);
 308 }
 309
 310 static int simd_aead_encrypt(struct aead_request *req)
 311 {
 312         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 313         struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 314         struct aead_request *subreq;
 315         struct crypto_aead *child;
 316
 317         subreq = aead_request_ctx(req);
 318         *subreq = *req;
 319
 320         if (!crypto_simd_usable() ||
 321             (in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm)))
 322                 child = &ctx->cryptd_tfm->base;
 323         else
 324                 child = cryptd_aead_child(ctx->cryptd_tfm);
 325
 326         aead_request_set_tfm(subreq, child);
 327
 328         return crypto_aead_encrypt(subreq);
 329 }
 330
 331 static int simd_aead_decrypt(struct aead_request *req)
 332 {
 333         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 334         struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 335         struct aead_request *subreq;
 336         struct crypto_aead *child;
 337
 338         subreq = aead_request_ctx(req);
 339         *subreq = *req;
 340
 341         if (!crypto_simd_usable() ||
 342             (in_atomic() && cryptd_aead_queued(ctx->cryptd_tfm)))
 343                 child = &ctx->cryptd_tfm->base;
 344         else
 345                 child = cryptd_aead_child(ctx->cryptd_tfm);
 346
 347         aead_request_set_tfm(subreq, child);
 348
 349         return crypto_aead_decrypt(subreq);
 350 }
 351
 352 static void simd_aead_exit(struct crypto_aead *tfm)
 353 {
 354         struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 355
 356         cryptd_free_aead(ctx->cryptd_tfm);
 357 }
 358
 359 static int simd_aead_init(struct crypto_aead *tfm)
 360 {
 361         struct simd_aead_ctx *ctx = crypto_aead_ctx(tfm);
 362         struct cryptd_aead *cryptd_tfm;
 363         struct simd_aead_alg *salg;
 364         struct aead_alg *alg;
 365         unsigned reqsize;
 366
 367         alg = crypto_aead_alg(tfm);
 368         salg = container_of(alg, struct simd_aead_alg, alg);
 369
 370         cryptd_tfm = cryptd_alloc_aead(salg->ialg_name, CRYPTO_ALG_INTERNAL,
 371                                        CRYPTO_ALG_INTERNAL);
 372         if (IS_ERR(cryptd_tfm))
 373                 return PTR_ERR(cryptd_tfm);
 374
 375         ctx->cryptd_tfm = cryptd_tfm;
 376
 377         reqsize = crypto_aead_reqsize(cryptd_aead_child(cryptd_tfm));
 378         reqsize = max(reqsize, crypto_aead_reqsize(&cryptd_tfm->base));
 379         reqsize += sizeof(struct aead_request);
 380
 381         crypto_aead_set_reqsize(tfm, reqsize);
 382
 383         return 0;
 384 }
 385
 386 struct simd_aead_alg *simd_aead_create_compat(const char *algname,
 387                                               const char *drvname,
 388                                               const char *basename)
 389 {
 390         struct simd_aead_alg *salg;
 391         struct crypto_aead *tfm;
 392         struct aead_alg *ialg;
 393         struct aead_alg *alg;
 394         int err;
 395
 396         tfm = crypto_alloc_aead(basename, CRYPTO_ALG_INTERNAL,
 397                                 CRYPTO_ALG_INTERNAL | CRYPTO_ALG_ASYNC);
 398         if (IS_ERR(tfm))
 399                 return ERR_CAST(tfm);
 400
 401         ialg = crypto_aead_alg(tfm);
 402
 403         salg = kzalloc(sizeof(*salg), GFP_KERNEL);
 404         if (!salg) {
 405                 salg = ERR_PTR(-ENOMEM);
 406                 goto out_put_tfm;
 407         }
 408
 409         salg->ialg_name = basename;
 410         alg = &salg->alg;
 411
 412         err = -ENAMETOOLONG;
 413         if (snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", algname) >=
 414             CRYPTO_MAX_ALG_NAME)
 415                 goto out_free_salg;
 416
 417         if (snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
 418                      drvname) >= CRYPTO_MAX_ALG_NAME)
 419                 goto out_free_salg;
 420
 421         alg->base.cra_flags = CRYPTO_ALG_ASYNC |
 422                 (ialg->base.cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
 423         alg->base.cra_priority = ialg->base.cra_priority;
 424         alg->base.cra_blocksize = ialg->base.cra_blocksize;
 425         alg->base.cra_alignmask = ialg->base.cra_alignmask;
 426         alg->base.cra_module = ialg->base.cra_module;
 427         alg->base.cra_ctxsize = sizeof(struct simd_aead_ctx);
 428
 429         alg->ivsize = ialg->ivsize;
 430         alg->maxauthsize = ialg->maxauthsize;
 431         alg->chunksize = ialg->chunksize;
 432
 433         alg->init = simd_aead_init;
 434         alg->exit = simd_aead_exit;
 435
 436         alg->setkey = simd_aead_setkey;
 437         alg->setauthsize = simd_aead_setauthsize;
 438         alg->encrypt = simd_aead_encrypt;
 439         alg->decrypt = simd_aead_decrypt;
 440
 441         err = crypto_register_aead(alg);
 442         if (err)
 443                 goto out_free_salg;
 444
 445 out_put_tfm:
 446         crypto_free_aead(tfm);
 447         return salg;
 448
 449 out_free_salg:
 450         kfree(salg);
 451         salg = ERR_PTR(err);
 452         goto out_put_tfm;
 453 }
 454 EXPORT_SYMBOL_GPL(simd_aead_create_compat);
 455
 456 struct simd_aead_alg *simd_aead_create(const char *algname,
 457                                        const char *basename)
 458 {
 459         char drvname[CRYPTO_MAX_ALG_NAME];
 460
 461         if (snprintf(drvname, CRYPTO_MAX_ALG_NAME, "simd-%s", basename) >=
 462             CRYPTO_MAX_ALG_NAME)
 463                 return ERR_PTR(-ENAMETOOLONG);
 464
 465         return simd_aead_create_compat(algname, drvname, basename);
 466 }
 467 EXPORT_SYMBOL_GPL(simd_aead_create);
 468
 469 void simd_aead_free(struct simd_aead_alg *salg)
 470 {
 471         crypto_unregister_aead(&salg->alg);
 472         kfree(salg);
 473 }
 474 EXPORT_SYMBOL_GPL(simd_aead_free);
 475
 476 int simd_register_aeads_compat(struct aead_alg *algs, int count,
 477                                struct simd_aead_alg **simd_algs)
 478 {
 479         int err;
 480         int i;
 481         const char *algname;
 482         const char *drvname;
 483         const char *basename;
 484         struct simd_aead_alg *simd;
 485
 486         err = crypto_register_aeads(algs, count);
 487         if (err)
 488                 return err;
 489
 490         for (i = 0; i < count; i++) {
 491                 WARN_ON(strncmp(algs[i].base.cra_name, "__", 2));
 492                 WARN_ON(strncmp(algs[i].base.cra_driver_name, "__", 2));
 493                 algname = algs[i].base.cra_name + 2;
 494                 drvname = algs[i].base.cra_driver_name + 2;
 495                 basename = algs[i].base.cra_driver_name;
 496                 simd = simd_aead_create_compat(algname, drvname, basename);
 497                 err = PTR_ERR(simd);
 498                 if (IS_ERR(simd))
 499                         goto err_unregister;
 500                 simd_algs[i] = simd;
 501         }
 502         return 0;
 503
 504 err_unregister:
 505         simd_unregister_aeads(algs, count, simd_algs);
 506         return err;
 507 }
 508 EXPORT_SYMBOL_GPL(simd_register_aeads_compat);
 509
 510 void simd_unregister_aeads(struct aead_alg *algs, int count,
 511                            struct simd_aead_alg **simd_algs)
 512 {
 513         int i;
 514
 515         crypto_unregister_aeads(algs, count);
 516
 517         for (i = 0; i < count; i++) {
 518                 if (simd_algs[i]) {
 519                         simd_aead_free(simd_algs[i]);
 520                         simd_algs[i] = NULL;
 521                 }
 522         }
 523 }
 524 EXPORT_SYMBOL_GPL(simd_unregister_aeads);
 525
 526 MODULE_LICENSE("GPL");