crypto/aead.c

   1 /*
   2  * AEAD: Authenticated Encryption with Associated Data
   3  *
   4  * This file provides API support for AEAD algorithms.
   5  *
   6  * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  *
  13  */
  14
  15 #include <crypto/internal/aead.h>
  16 #include <crypto/scatterwalk.h>
  17 #include <linux/err.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/sched.h>
  23 #include <linux/slab.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/cryptouser.h>
  26 #include <net/netlink.h>
  27
  28 #include "internal.h"
  29
  30 static int aead_null_givencrypt(struct aead_givcrypt_request *req);
  31 static int aead_null_givdecrypt(struct aead_givcrypt_request *req);
  32
  33 static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
  34                             unsigned int keylen)
  35 {
  36         unsigned long alignmask = crypto_aead_alignmask(tfm);
  37         int ret;
  38         u8 *buffer, *alignbuffer;
  39         unsigned long absize;
  40
  41         absize = keylen + alignmask;
  42         buffer = kmalloc(absize, GFP_ATOMIC);
  43         if (!buffer)
  44                 return -ENOMEM;
  45
  46         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
  47         memcpy(alignbuffer, key, keylen);
  48         ret = tfm->setkey(tfm, alignbuffer, keylen);
  49         memset(alignbuffer, 0, keylen);
  50         kfree(buffer);
  51         return ret;
  52 }
  53
  54 int crypto_aead_setkey(struct crypto_aead *tfm,
  55                        const u8 *key, unsigned int keylen)
  56 {
  57         unsigned long alignmask = crypto_aead_alignmask(tfm);
  58
  59         tfm = tfm->child;
  60
  61         if ((unsigned long)key & alignmask)
  62                 return setkey_unaligned(tfm, key, keylen);
  63
  64         return tfm->setkey(tfm, key, keylen);
  65 }
  66 EXPORT_SYMBOL_GPL(crypto_aead_setkey);
  67
  68 int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
  69 {
  70         int err;
  71
  72         if (authsize > tfm->maxauthsize)
  73                 return -EINVAL;
  74
  75         if (tfm->setauthsize) {
  76                 err = tfm->setauthsize(tfm->child, authsize);
  77                 if (err)
  78                         return err;
  79         }
  80
  81         tfm->child->authsize = authsize;
  82         tfm->authsize = authsize;
  83         return 0;
  84 }
  85 EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
  86
  87 struct aead_old_request {
  88         struct scatterlist srcbuf[2];
  89         struct scatterlist dstbuf[2];
  90         struct aead_request subreq;
  91 };
  92
  93 unsigned int crypto_aead_reqsize(struct crypto_aead *tfm)
  94 {
  95         return tfm->reqsize + sizeof(struct aead_old_request);
  96 }
  97 EXPORT_SYMBOL_GPL(crypto_aead_reqsize);
  98
  99 static int old_crypt(struct aead_request *req,
 100                      int (*crypt)(struct aead_request *req))
 101 {
 102         struct aead_old_request *nreq = aead_request_ctx(req);
 103         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 104         struct scatterlist *src, *dst;
 105
 106         if (req->old)
 107                 return crypt(req);
 108
 109         src = scatterwalk_ffwd(nreq->srcbuf, req->src,
 110                                req->assoclen + req->cryptoff);
 111         dst = scatterwalk_ffwd(nreq->dstbuf, req->dst,
 112                                req->assoclen + req->cryptoff);
 113
 114         aead_request_set_tfm(&nreq->subreq, aead);
 115         aead_request_set_callback(&nreq->subreq, aead_request_flags(req),
 116                                   req->base.complete, req->base.data);
 117         aead_request_set_crypt(&nreq->subreq, src, dst, req->cryptlen,
 118                                req->iv);
 119         aead_request_set_assoc(&nreq->subreq, req->src, req->assoclen);
 120
 121         return crypt(&nreq->subreq);
 122 }
 123
 124 static int old_encrypt(struct aead_request *req)
 125 {
 126         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 127         struct old_aead_alg *alg = crypto_old_aead_alg(aead);
 128
 129         return old_crypt(req, alg->encrypt);
 130 }
 131
 132 static int old_decrypt(struct aead_request *req)
 133 {
 134         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 135         struct old_aead_alg *alg = crypto_old_aead_alg(aead);
 136
 137         return old_crypt(req, alg->decrypt);
 138 }
 139
 140 static int no_givcrypt(struct aead_givcrypt_request *req)
 141 {
 142         return -ENOSYS;
 143 }
 144
 145 static int crypto_old_aead_init_tfm(struct crypto_tfm *tfm)
 146 {
 147         struct old_aead_alg *alg = &tfm->__crt_alg->cra_aead;
 148         struct crypto_aead *crt = __crypto_aead_cast(tfm);
 149
 150         if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
 151                 return -EINVAL;
 152
 153         crt->setkey = alg->setkey;
 154         crt->setauthsize = alg->setauthsize;
 155         crt->encrypt = old_encrypt;
 156         crt->decrypt = old_decrypt;
 157         if (alg->ivsize) {
 158                 crt->givencrypt = alg->givencrypt ?: no_givcrypt;
 159                 crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
 160         } else {
 161                 crt->givencrypt = aead_null_givencrypt;
 162                 crt->givdecrypt = aead_null_givdecrypt;
 163         }
 164         crt->child = __crypto_aead_cast(tfm);
 165         crt->ivsize = alg->ivsize;
 166         crt->maxauthsize = alg->maxauthsize;
 167         crt->authsize = alg->maxauthsize;
 168
 169         return 0;
 170 }
 171
 172 static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
 173 {
 174         struct crypto_aead *aead = __crypto_aead_cast(tfm);
 175         struct aead_alg *alg = crypto_aead_alg(aead);
 176
 177         if (crypto_old_aead_alg(aead)->encrypt)
 178                 return crypto_old_aead_init_tfm(tfm);
 179
 180         aead->setkey = alg->setkey;
 181         aead->setauthsize = alg->setauthsize;
 182         aead->encrypt = alg->encrypt;
 183         aead->decrypt = alg->decrypt;
 184         aead->child = __crypto_aead_cast(tfm);
 185         aead->ivsize = alg->ivsize;
 186         aead->maxauthsize = alg->maxauthsize;
 187         aead->authsize = alg->maxauthsize;
 188
 189         return 0;
 190 }
 191
 192 #ifdef CONFIG_NET
 193 static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 194 {
 195         struct crypto_report_aead raead;
 196         struct old_aead_alg *aead = &alg->cra_aead;
 197
 198         strncpy(raead.type, "aead", sizeof(raead.type));
 199         strncpy(raead.geniv, aead->geniv ?: "<built-in>", sizeof(raead.geniv));
 200
 201         raead.blocksize = alg->cra_blocksize;
 202         raead.maxauthsize = aead->maxauthsize;
 203         raead.ivsize = aead->ivsize;
 204
 205         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
 206                     sizeof(struct crypto_report_aead), &raead))
 207                 goto nla_put_failure;
 208         return 0;
 209
 210 nla_put_failure:
 211         return -EMSGSIZE;
 212 }
 213 #else
 214 static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 215 {
 216         return -ENOSYS;
 217 }
 218 #endif
 219
 220 static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg)
 221         __attribute__ ((unused));
 222 static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg)
 223 {
 224         struct old_aead_alg *aead = &alg->cra_aead;
 225
 226         seq_printf(m, "type         : aead\n");
 227         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 228                                              "yes" : "no");
 229         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 230         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
 231         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
 232         seq_printf(m, "geniv        : %s\n", aead->geniv ?: "<built-in>");
 233 }
 234
 235 const struct crypto_type crypto_aead_type = {
 236         .extsize = crypto_alg_extsize,
 237         .init_tfm = crypto_aead_init_tfm,
 238 #ifdef CONFIG_PROC_FS
 239         .show = crypto_old_aead_show,
 240 #endif
 241         .report = crypto_old_aead_report,
 242         .lookup = crypto_lookup_aead,
 243         .maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
 244         .maskset = CRYPTO_ALG_TYPE_MASK,
 245         .type = CRYPTO_ALG_TYPE_AEAD,
 246         .tfmsize = offsetof(struct crypto_aead, base),
 247 };
 248 EXPORT_SYMBOL_GPL(crypto_aead_type);
 249
 250 #ifdef CONFIG_NET
 251 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 252 {
 253         struct crypto_report_aead raead;
 254         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
 255
 256         strncpy(raead.type, "aead", sizeof(raead.type));
 257         strncpy(raead.geniv, "<none>", sizeof(raead.geniv));
 258
 259         raead.blocksize = alg->cra_blocksize;
 260         raead.maxauthsize = aead->maxauthsize;
 261         raead.ivsize = aead->ivsize;
 262
 263         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
 264                     sizeof(struct crypto_report_aead), &raead))
 265                 goto nla_put_failure;
 266         return 0;
 267
 268 nla_put_failure:
 269         return -EMSGSIZE;
 270 }
 271 #else
 272 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 273 {
 274         return -ENOSYS;
 275 }
 276 #endif
 277
 278 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
 279         __attribute__ ((unused));
 280 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
 281 {
 282         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
 283
 284         seq_printf(m, "type         : aead\n");
 285         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 286                                              "yes" : "no");
 287         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 288         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
 289         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
 290         seq_printf(m, "geniv        : <none>\n");
 291 }
 292
 293 static const struct crypto_type crypto_new_aead_type = {
 294         .extsize = crypto_alg_extsize,
 295         .init_tfm = crypto_aead_init_tfm,
 296 #ifdef CONFIG_PROC_FS
 297         .show = crypto_aead_show,
 298 #endif
 299         .report = crypto_aead_report,
 300         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 301         .maskset = CRYPTO_ALG_TYPE_MASK,
 302         .type = CRYPTO_ALG_TYPE_AEAD,
 303         .tfmsize = offsetof(struct crypto_aead, base),
 304 };
 305
 306 static int aead_null_givencrypt(struct aead_givcrypt_request *req)
 307 {
 308         return crypto_aead_encrypt(&req->areq);
 309 }
 310
 311 static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
 312 {
 313         return crypto_aead_decrypt(&req->areq);
 314 }
 315
 316 #ifdef CONFIG_NET
 317 static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
 318 {
 319         struct crypto_report_aead raead;
 320         struct old_aead_alg *aead = &alg->cra_aead;
 321
 322         strncpy(raead.type, "nivaead", sizeof(raead.type));
 323         strncpy(raead.geniv, aead->geniv, sizeof(raead.geniv));
 324
 325         raead.blocksize = alg->cra_blocksize;
 326         raead.maxauthsize = aead->maxauthsize;
 327         raead.ivsize = aead->ivsize;
 328
 329         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
 330                     sizeof(struct crypto_report_aead), &raead))
 331                 goto nla_put_failure;
 332         return 0;
 333
 334 nla_put_failure:
 335         return -EMSGSIZE;
 336 }
 337 #else
 338 static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
 339 {
 340         return -ENOSYS;
 341 }
 342 #endif
 343
 344
 345 static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
 346         __attribute__ ((unused));
 347 static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
 348 {
 349         struct old_aead_alg *aead = &alg->cra_aead;
 350
 351         seq_printf(m, "type         : nivaead\n");
 352         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 353                                              "yes" : "no");
 354         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 355         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
 356         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
 357         seq_printf(m, "geniv        : %s\n", aead->geniv);
 358 }
 359
 360 const struct crypto_type crypto_nivaead_type = {
 361         .extsize = crypto_alg_extsize,
 362         .init_tfm = crypto_aead_init_tfm,
 363 #ifdef CONFIG_PROC_FS
 364         .show = crypto_nivaead_show,
 365 #endif
 366         .report = crypto_nivaead_report,
 367         .maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
 368         .maskset = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV,
 369         .type = CRYPTO_ALG_TYPE_AEAD,
 370         .tfmsize = offsetof(struct crypto_aead, base),
 371 };
 372 EXPORT_SYMBOL_GPL(crypto_nivaead_type);
 373
 374 static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
 375                                const char *name, u32 type, u32 mask)
 376 {
 377         spawn->base.frontend = &crypto_nivaead_type;
 378         return crypto_grab_spawn(&spawn->base, name, type, mask);
 379 }
 380
 381 struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,
 382                                          struct rtattr **tb, u32 type,
 383                                          u32 mask)
 384 {
 385         const char *name;
 386         struct crypto_aead_spawn *spawn;
 387         struct crypto_attr_type *algt;
 388         struct crypto_instance *inst;
 389         struct crypto_alg *alg;
 390         int err;
 391
 392         algt = crypto_get_attr_type(tb);
 393         if (IS_ERR(algt))
 394                 return ERR_CAST(algt);
 395
 396         if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
 397             algt->mask)
 398                 return ERR_PTR(-EINVAL);
 399
 400         name = crypto_attr_alg_name(tb[1]);
 401         if (IS_ERR(name))
 402                 return ERR_CAST(name);
 403
 404         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 405         if (!inst)
 406                 return ERR_PTR(-ENOMEM);
 407
 408         spawn = crypto_instance_ctx(inst);
 409
 410         /* Ignore async algorithms if necessary. */
 411         mask |= crypto_requires_sync(algt->type, algt->mask);
 412
 413         crypto_set_aead_spawn(spawn, inst);
 414         err = crypto_grab_nivaead(spawn, name, type, mask);
 415         if (err)
 416                 goto err_free_inst;
 417
 418         alg = crypto_aead_spawn_alg(spawn);
 419
 420         err = -EINVAL;
 421         if (!alg->cra_aead.ivsize)
 422                 goto err_drop_alg;
 423
 424         /*
 425          * This is only true if we're constructing an algorithm with its
 426          * default IV generator.  For the default generator we elide the
 427          * template name and double-check the IV generator.
 428          */
 429         if (algt->mask & CRYPTO_ALG_GENIV) {
 430                 if (strcmp(tmpl->name, alg->cra_aead.geniv))
 431                         goto err_drop_alg;
 432
 433                 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 434                 memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
 435                        CRYPTO_MAX_ALG_NAME);
 436         } else {
 437                 err = -ENAMETOOLONG;
 438                 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
 439                              "%s(%s)", tmpl->name, alg->cra_name) >=
 440                     CRYPTO_MAX_ALG_NAME)
 441                         goto err_drop_alg;
 442                 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 443                              "%s(%s)", tmpl->name, alg->cra_driver_name) >=
 444                     CRYPTO_MAX_ALG_NAME)
 445                         goto err_drop_alg;
 446         }
 447
 448         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV;
 449         inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
 450         inst->alg.cra_priority = alg->cra_priority;
 451         inst->alg.cra_blocksize = alg->cra_blocksize;
 452         inst->alg.cra_alignmask = alg->cra_alignmask;
 453         inst->alg.cra_type = &crypto_aead_type;
 454
 455         inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
 456         inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
 457         inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
 458
 459         inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
 460         inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
 461         inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
 462         inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;
 463
 464 out:
 465         return inst;
 466
 467 err_drop_alg:
 468         crypto_drop_aead(spawn);
 469 err_free_inst:
 470         kfree(inst);
 471         inst = ERR_PTR(err);
 472         goto out;
 473 }
 474 EXPORT_SYMBOL_GPL(aead_geniv_alloc);
 475
 476 void aead_geniv_free(struct crypto_instance *inst)
 477 {
 478         crypto_drop_aead(crypto_instance_ctx(inst));
 479         kfree(inst);
 480 }
 481 EXPORT_SYMBOL_GPL(aead_geniv_free);
 482
 483 int aead_geniv_init(struct crypto_tfm *tfm)
 484 {
 485         struct crypto_instance *inst = (void *)tfm->__crt_alg;
 486         struct crypto_aead *child;
 487         struct crypto_aead *aead;
 488
 489         aead = __crypto_aead_cast(tfm);
 490
 491         child = crypto_spawn_aead(crypto_instance_ctx(inst));
 492         if (IS_ERR(child))
 493                 return PTR_ERR(child);
 494
 495         aead->child = child;
 496         aead->reqsize += crypto_aead_reqsize(child);
 497
 498         return 0;
 499 }
 500 EXPORT_SYMBOL_GPL(aead_geniv_init);
 501
 502 void aead_geniv_exit(struct crypto_tfm *tfm)
 503 {
 504         crypto_free_aead(__crypto_aead_cast(tfm)->child);
 505 }
 506 EXPORT_SYMBOL_GPL(aead_geniv_exit);
 507
 508 static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
 509 {
 510         struct rtattr *tb[3];
 511         struct {
 512                 struct rtattr attr;
 513                 struct crypto_attr_type data;
 514         } ptype;
 515         struct {
 516                 struct rtattr attr;
 517                 struct crypto_attr_alg data;
 518         } palg;
 519         struct crypto_template *tmpl;
 520         struct crypto_instance *inst;
 521         struct crypto_alg *larval;
 522         const char *geniv;
 523         int err;
 524
 525         larval = crypto_larval_lookup(alg->cra_driver_name,
 526                                       CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,
 527                                       CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 528         err = PTR_ERR(larval);
 529         if (IS_ERR(larval))
 530                 goto out;
 531
 532         err = -EAGAIN;
 533         if (!crypto_is_larval(larval))
 534                 goto drop_larval;
 535
 536         ptype.attr.rta_len = sizeof(ptype);
 537         ptype.attr.rta_type = CRYPTOA_TYPE;
 538         ptype.data.type = type | CRYPTO_ALG_GENIV;
 539         /* GENIV tells the template that we're making a default geniv. */
 540         ptype.data.mask = mask | CRYPTO_ALG_GENIV;
 541         tb[0] = &ptype.attr;
 542
 543         palg.attr.rta_len = sizeof(palg);
 544         palg.attr.rta_type = CRYPTOA_ALG;
 545         /* Must use the exact name to locate ourselves. */
 546         memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
 547         tb[1] = &palg.attr;
 548
 549         tb[2] = NULL;
 550
 551         geniv = alg->cra_aead.geniv;
 552
 553         tmpl = crypto_lookup_template(geniv);
 554         err = -ENOENT;
 555         if (!tmpl)
 556                 goto kill_larval;
 557
 558         inst = tmpl->alloc(tb);
 559         err = PTR_ERR(inst);
 560         if (IS_ERR(inst))
 561                 goto put_tmpl;
 562
 563         err = crypto_register_instance(tmpl, inst);
 564         if (err) {
 565                 tmpl->free(inst);
 566                 goto put_tmpl;
 567         }
 568
 569         /* Redo the lookup to use the instance we just registered. */
 570         err = -EAGAIN;
 571
 572 put_tmpl:
 573         crypto_tmpl_put(tmpl);
 574 kill_larval:
 575         crypto_larval_kill(larval);
 576 drop_larval:
 577         crypto_mod_put(larval);
 578 out:
 579         crypto_mod_put(alg);
 580         return err;
 581 }
 582
 583 struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, u32 mask)
 584 {
 585         struct crypto_alg *alg;
 586
 587         alg = crypto_alg_mod_lookup(name, type, mask);
 588         if (IS_ERR(alg))
 589                 return alg;
 590
 591         if (alg->cra_type == &crypto_aead_type)
 592                 return alg;
 593
 594         if (!alg->cra_aead.ivsize)
 595                 return alg;
 596
 597         crypto_mod_put(alg);
 598         alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
 599                                     mask & ~CRYPTO_ALG_TESTED);
 600         if (IS_ERR(alg))
 601                 return alg;
 602
 603         if (alg->cra_type == &crypto_aead_type) {
 604                 if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) {
 605                         crypto_mod_put(alg);
 606                         alg = ERR_PTR(-ENOENT);
 607                 }
 608                 return alg;
 609         }
 610
 611         BUG_ON(!alg->cra_aead.ivsize);
 612
 613         return ERR_PTR(crypto_nivaead_default(alg, type, mask));
 614 }
 615 EXPORT_SYMBOL_GPL(crypto_lookup_aead);
 616
 617 int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
 618                      u32 type, u32 mask)
 619 {
 620         spawn->base.frontend = &crypto_aead_type;
 621         return crypto_grab_spawn(&spawn->base, name, type, mask);
 622 }
 623 EXPORT_SYMBOL_GPL(crypto_grab_aead);
 624
 625 struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
 626 {
 627         return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
 628 }
 629 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
 630
 631 static int aead_prepare_alg(struct aead_alg *alg)
 632 {
 633         struct crypto_alg *base = &alg->base;
 634
 635         if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
 636                 return -EINVAL;
 637
 638         base->cra_type = &crypto_new_aead_type;
 639         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 640         base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
 641
 642         return 0;
 643 }
 644
 645 int crypto_register_aead(struct aead_alg *alg)
 646 {
 647         struct crypto_alg *base = &alg->base;
 648         int err;
 649
 650         err = aead_prepare_alg(alg);
 651         if (err)
 652                 return err;
 653
 654         return crypto_register_alg(base);
 655 }
 656 EXPORT_SYMBOL_GPL(crypto_register_aead);
 657
 658 int crypto_unregister_aead(struct aead_alg *alg)
 659 {
 660         return crypto_unregister_alg(&alg->base);
 661 }
 662 EXPORT_SYMBOL_GPL(crypto_unregister_aead);
 663
 664 int aead_register_instance(struct crypto_template *tmpl,
 665                            struct aead_instance *inst)
 666 {
 667         int err;
 668
 669         err = aead_prepare_alg(&inst->alg);
 670         if (err)
 671                 return err;
 672
 673         return crypto_register_instance(tmpl, aead_crypto_instance(inst));
 674 }
 675 EXPORT_SYMBOL_GPL(aead_register_instance);
 676
 677 MODULE_LICENSE("GPL");
 678 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");