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 > crypto_aead_maxauthsize(tfm))
  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, req->assoclen);
 110         dst = scatterwalk_ffwd(nreq->dstbuf, req->dst, req->assoclen);
 111
 112         aead_request_set_tfm(&nreq->subreq, aead);
 113         aead_request_set_callback(&nreq->subreq, aead_request_flags(req),
 114                                   req->base.complete, req->base.data);
 115         aead_request_set_crypt(&nreq->subreq, src, dst, req->cryptlen,
 116                                req->iv);
 117         aead_request_set_assoc(&nreq->subreq, req->src, req->assoclen);
 118
 119         return crypt(&nreq->subreq);
 120 }
 121
 122 static int old_encrypt(struct aead_request *req)
 123 {
 124         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 125         struct old_aead_alg *alg = crypto_old_aead_alg(aead);
 126
 127         return old_crypt(req, alg->encrypt);
 128 }
 129
 130 static int old_decrypt(struct aead_request *req)
 131 {
 132         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 133         struct old_aead_alg *alg = crypto_old_aead_alg(aead);
 134
 135         return old_crypt(req, alg->decrypt);
 136 }
 137
 138 static int no_givcrypt(struct aead_givcrypt_request *req)
 139 {
 140         return -ENOSYS;
 141 }
 142
 143 static int crypto_old_aead_init_tfm(struct crypto_tfm *tfm)
 144 {
 145         struct old_aead_alg *alg = &tfm->__crt_alg->cra_aead;
 146         struct crypto_aead *crt = __crypto_aead_cast(tfm);
 147
 148         if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
 149                 return -EINVAL;
 150
 151         crt->setkey = alg->setkey;
 152         crt->setauthsize = alg->setauthsize;
 153         crt->encrypt = old_encrypt;
 154         crt->decrypt = old_decrypt;
 155         if (alg->ivsize) {
 156                 crt->givencrypt = alg->givencrypt ?: no_givcrypt;
 157                 crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
 158         } else {
 159                 crt->givencrypt = aead_null_givencrypt;
 160                 crt->givdecrypt = aead_null_givdecrypt;
 161         }
 162         crt->child = __crypto_aead_cast(tfm);
 163         crt->authsize = alg->maxauthsize;
 164
 165         return 0;
 166 }
 167
 168 static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
 169 {
 170         struct crypto_aead *aead = __crypto_aead_cast(tfm);
 171         struct aead_alg *alg = crypto_aead_alg(aead);
 172
 173         if (crypto_old_aead_alg(aead)->encrypt)
 174                 return crypto_old_aead_init_tfm(tfm);
 175
 176         aead->setkey = alg->setkey;
 177         aead->setauthsize = alg->setauthsize;
 178         aead->encrypt = alg->encrypt;
 179         aead->decrypt = alg->decrypt;
 180         aead->child = __crypto_aead_cast(tfm);
 181         aead->authsize = alg->maxauthsize;
 182
 183         return 0;
 184 }
 185
 186 #ifdef CONFIG_NET
 187 static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 188 {
 189         struct crypto_report_aead raead;
 190         struct old_aead_alg *aead = &alg->cra_aead;
 191
 192         strncpy(raead.type, "aead", sizeof(raead.type));
 193         strncpy(raead.geniv, aead->geniv ?: "<built-in>", sizeof(raead.geniv));
 194
 195         raead.blocksize = alg->cra_blocksize;
 196         raead.maxauthsize = aead->maxauthsize;
 197         raead.ivsize = aead->ivsize;
 198
 199         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
 200                     sizeof(struct crypto_report_aead), &raead))
 201                 goto nla_put_failure;
 202         return 0;
 203
 204 nla_put_failure:
 205         return -EMSGSIZE;
 206 }
 207 #else
 208 static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 209 {
 210         return -ENOSYS;
 211 }
 212 #endif
 213
 214 static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg)
 215         __attribute__ ((unused));
 216 static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg)
 217 {
 218         struct old_aead_alg *aead = &alg->cra_aead;
 219
 220         seq_printf(m, "type         : aead\n");
 221         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 222                                              "yes" : "no");
 223         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 224         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
 225         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
 226         seq_printf(m, "geniv        : %s\n", aead->geniv ?: "<built-in>");
 227 }
 228
 229 const struct crypto_type crypto_aead_type = {
 230         .extsize = crypto_alg_extsize,
 231         .init_tfm = crypto_aead_init_tfm,
 232 #ifdef CONFIG_PROC_FS
 233         .show = crypto_old_aead_show,
 234 #endif
 235         .report = crypto_old_aead_report,
 236         .lookup = crypto_lookup_aead,
 237         .maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
 238         .maskset = CRYPTO_ALG_TYPE_MASK,
 239         .type = CRYPTO_ALG_TYPE_AEAD,
 240         .tfmsize = offsetof(struct crypto_aead, base),
 241 };
 242 EXPORT_SYMBOL_GPL(crypto_aead_type);
 243
 244 #ifdef CONFIG_NET
 245 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 246 {
 247         struct crypto_report_aead raead;
 248         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
 249
 250         strncpy(raead.type, "aead", sizeof(raead.type));
 251         strncpy(raead.geniv, "<none>", sizeof(raead.geniv));
 252
 253         raead.blocksize = alg->cra_blocksize;
 254         raead.maxauthsize = aead->maxauthsize;
 255         raead.ivsize = aead->ivsize;
 256
 257         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
 258                     sizeof(struct crypto_report_aead), &raead))
 259                 goto nla_put_failure;
 260         return 0;
 261
 262 nla_put_failure:
 263         return -EMSGSIZE;
 264 }
 265 #else
 266 static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
 267 {
 268         return -ENOSYS;
 269 }
 270 #endif
 271
 272 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
 273         __attribute__ ((unused));
 274 static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
 275 {
 276         struct aead_alg *aead = container_of(alg, struct aead_alg, base);
 277
 278         seq_printf(m, "type         : aead\n");
 279         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 280                                              "yes" : "no");
 281         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 282         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
 283         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
 284         seq_printf(m, "geniv        : <none>\n");
 285 }
 286
 287 static const struct crypto_type crypto_new_aead_type = {
 288         .extsize = crypto_alg_extsize,
 289         .init_tfm = crypto_aead_init_tfm,
 290 #ifdef CONFIG_PROC_FS
 291         .show = crypto_aead_show,
 292 #endif
 293         .report = crypto_aead_report,
 294         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 295         .maskset = CRYPTO_ALG_TYPE_MASK,
 296         .type = CRYPTO_ALG_TYPE_AEAD,
 297         .tfmsize = offsetof(struct crypto_aead, base),
 298 };
 299
 300 static int aead_null_givencrypt(struct aead_givcrypt_request *req)
 301 {
 302         return crypto_aead_encrypt(&req->areq);
 303 }
 304
 305 static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
 306 {
 307         return crypto_aead_decrypt(&req->areq);
 308 }
 309
 310 #ifdef CONFIG_NET
 311 static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
 312 {
 313         struct crypto_report_aead raead;
 314         struct old_aead_alg *aead = &alg->cra_aead;
 315
 316         strncpy(raead.type, "nivaead", sizeof(raead.type));
 317         strncpy(raead.geniv, aead->geniv, sizeof(raead.geniv));
 318
 319         raead.blocksize = alg->cra_blocksize;
 320         raead.maxauthsize = aead->maxauthsize;
 321         raead.ivsize = aead->ivsize;
 322
 323         if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
 324                     sizeof(struct crypto_report_aead), &raead))
 325                 goto nla_put_failure;
 326         return 0;
 327
 328 nla_put_failure:
 329         return -EMSGSIZE;
 330 }
 331 #else
 332 static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
 333 {
 334         return -ENOSYS;
 335 }
 336 #endif
 337
 338
 339 static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
 340         __attribute__ ((unused));
 341 static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
 342 {
 343         struct old_aead_alg *aead = &alg->cra_aead;
 344
 345         seq_printf(m, "type         : nivaead\n");
 346         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 347                                              "yes" : "no");
 348         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 349         seq_printf(m, "ivsize       : %u\n", aead->ivsize);
 350         seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
 351         seq_printf(m, "geniv        : %s\n", aead->geniv);
 352 }
 353
 354 const struct crypto_type crypto_nivaead_type = {
 355         .extsize = crypto_alg_extsize,
 356         .init_tfm = crypto_aead_init_tfm,
 357 #ifdef CONFIG_PROC_FS
 358         .show = crypto_nivaead_show,
 359 #endif
 360         .report = crypto_nivaead_report,
 361         .maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
 362         .maskset = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV,
 363         .type = CRYPTO_ALG_TYPE_AEAD,
 364         .tfmsize = offsetof(struct crypto_aead, base),
 365 };
 366 EXPORT_SYMBOL_GPL(crypto_nivaead_type);
 367
 368 static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
 369                                const char *name, u32 type, u32 mask)
 370 {
 371         spawn->base.frontend = &crypto_nivaead_type;
 372         return crypto_grab_spawn(&spawn->base, name, type, mask);
 373 }
 374
 375 struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
 376                                        struct rtattr **tb, u32 type, u32 mask)
 377 {
 378         const char *name;
 379         struct crypto_aead_spawn *spawn;
 380         struct crypto_attr_type *algt;
 381         struct aead_instance *inst;
 382         struct aead_alg *alg;
 383         unsigned int ivsize;
 384         unsigned int maxauthsize;
 385         int err;
 386
 387         algt = crypto_get_attr_type(tb);
 388         if (IS_ERR(algt))
 389                 return ERR_CAST(algt);
 390
 391         if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
 392             algt->mask)
 393                 return ERR_PTR(-EINVAL);
 394
 395         name = crypto_attr_alg_name(tb[1]);
 396         if (IS_ERR(name))
 397                 return ERR_CAST(name);
 398
 399         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 400         if (!inst)
 401                 return ERR_PTR(-ENOMEM);
 402
 403         spawn = aead_instance_ctx(inst);
 404
 405         /* Ignore async algorithms if necessary. */
 406         mask |= crypto_requires_sync(algt->type, algt->mask);
 407
 408         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
 409         err = crypto_grab_nivaead(spawn, name, type, mask);
 410         if (err)
 411                 goto err_free_inst;
 412
 413         alg = crypto_spawn_aead_alg(spawn);
 414
 415         ivsize = crypto_aead_alg_ivsize(alg);
 416         maxauthsize = crypto_aead_alg_maxauthsize(alg);
 417
 418         err = -EINVAL;
 419         if (!ivsize)
 420                 goto err_drop_alg;
 421
 422         /*
 423          * This is only true if we're constructing an algorithm with its
 424          * default IV generator.  For the default generator we elide the
 425          * template name and double-check the IV generator.
 426          */
 427         if (algt->mask & CRYPTO_ALG_GENIV) {
 428                 if (!alg->base.cra_aead.encrypt)
 429                         goto err_drop_alg;
 430                 if (strcmp(tmpl->name, alg->base.cra_aead.geniv))
 431                         goto err_drop_alg;
 432
 433                 memcpy(inst->alg.base.cra_name, alg->base.cra_name,
 434                        CRYPTO_MAX_ALG_NAME);
 435                 memcpy(inst->alg.base.cra_driver_name,
 436                        alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME);
 437
 438                 inst->alg.base.cra_flags = CRYPTO_ALG_TYPE_AEAD |
 439                                            CRYPTO_ALG_GENIV;
 440                 inst->alg.base.cra_flags |= alg->base.cra_flags &
 441                                             CRYPTO_ALG_ASYNC;
 442                 inst->alg.base.cra_priority = alg->base.cra_priority;
 443                 inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
 444                 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
 445                 inst->alg.base.cra_type = &crypto_aead_type;
 446
 447                 inst->alg.base.cra_aead.ivsize = ivsize;
 448                 inst->alg.base.cra_aead.maxauthsize = maxauthsize;
 449
 450                 inst->alg.base.cra_aead.setkey = alg->base.cra_aead.setkey;
 451                 inst->alg.base.cra_aead.setauthsize =
 452                         alg->base.cra_aead.setauthsize;
 453                 inst->alg.base.cra_aead.encrypt = alg->base.cra_aead.encrypt;
 454                 inst->alg.base.cra_aead.decrypt = alg->base.cra_aead.decrypt;
 455
 456                 goto out;
 457         }
 458
 459         err = -ENAMETOOLONG;
 460         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 461                      "%s(%s)", tmpl->name, alg->base.cra_name) >=
 462             CRYPTO_MAX_ALG_NAME)
 463                 goto err_drop_alg;
 464         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 465                      "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
 466             CRYPTO_MAX_ALG_NAME)
 467                 goto err_drop_alg;
 468
 469         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
 470         inst->alg.base.cra_priority = alg->base.cra_priority;
 471         inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
 472         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
 473
 474         inst->alg.ivsize = ivsize;
 475         inst->alg.maxauthsize = maxauthsize;
 476
 477 out:
 478         return inst;
 479
 480 err_drop_alg:
 481         crypto_drop_aead(spawn);
 482 err_free_inst:
 483         kfree(inst);
 484         inst = ERR_PTR(err);
 485         goto out;
 486 }
 487 EXPORT_SYMBOL_GPL(aead_geniv_alloc);
 488
 489 void aead_geniv_free(struct aead_instance *inst)
 490 {
 491         crypto_drop_aead(aead_instance_ctx(inst));
 492         kfree(inst);
 493 }
 494 EXPORT_SYMBOL_GPL(aead_geniv_free);
 495
 496 int aead_geniv_init(struct crypto_tfm *tfm)
 497 {
 498         struct crypto_instance *inst = (void *)tfm->__crt_alg;
 499         struct crypto_aead *child;
 500         struct crypto_aead *aead;
 501
 502         aead = __crypto_aead_cast(tfm);
 503
 504         child = crypto_spawn_aead(crypto_instance_ctx(inst));
 505         if (IS_ERR(child))
 506                 return PTR_ERR(child);
 507
 508         aead->child = child;
 509         aead->reqsize += crypto_aead_reqsize(child);
 510
 511         return 0;
 512 }
 513 EXPORT_SYMBOL_GPL(aead_geniv_init);
 514
 515 void aead_geniv_exit(struct crypto_tfm *tfm)
 516 {
 517         crypto_free_aead(__crypto_aead_cast(tfm)->child);
 518 }
 519 EXPORT_SYMBOL_GPL(aead_geniv_exit);
 520
 521 static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
 522 {
 523         struct rtattr *tb[3];
 524         struct {
 525                 struct rtattr attr;
 526                 struct crypto_attr_type data;
 527         } ptype;
 528         struct {
 529                 struct rtattr attr;
 530                 struct crypto_attr_alg data;
 531         } palg;
 532         struct crypto_template *tmpl;
 533         struct crypto_instance *inst;
 534         struct crypto_alg *larval;
 535         const char *geniv;
 536         int err;
 537
 538         larval = crypto_larval_lookup(alg->cra_driver_name,
 539                                       CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,
 540                                       CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
 541         err = PTR_ERR(larval);
 542         if (IS_ERR(larval))
 543                 goto out;
 544
 545         err = -EAGAIN;
 546         if (!crypto_is_larval(larval))
 547                 goto drop_larval;
 548
 549         ptype.attr.rta_len = sizeof(ptype);
 550         ptype.attr.rta_type = CRYPTOA_TYPE;
 551         ptype.data.type = type | CRYPTO_ALG_GENIV;
 552         /* GENIV tells the template that we're making a default geniv. */
 553         ptype.data.mask = mask | CRYPTO_ALG_GENIV;
 554         tb[0] = &ptype.attr;
 555
 556         palg.attr.rta_len = sizeof(palg);
 557         palg.attr.rta_type = CRYPTOA_ALG;
 558         /* Must use the exact name to locate ourselves. */
 559         memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
 560         tb[1] = &palg.attr;
 561
 562         tb[2] = NULL;
 563
 564         geniv = alg->cra_aead.geniv;
 565
 566         tmpl = crypto_lookup_template(geniv);
 567         err = -ENOENT;
 568         if (!tmpl)
 569                 goto kill_larval;
 570
 571         if (tmpl->create) {
 572                 err = tmpl->create(tmpl, tb);
 573                 if (err)
 574                         goto put_tmpl;
 575                 goto ok;
 576         }
 577
 578         inst = tmpl->alloc(tb);
 579         err = PTR_ERR(inst);
 580         if (IS_ERR(inst))
 581                 goto put_tmpl;
 582
 583         err = crypto_register_instance(tmpl, inst);
 584         if (err) {
 585                 tmpl->free(inst);
 586                 goto put_tmpl;
 587         }
 588
 589 ok:
 590         /* Redo the lookup to use the instance we just registered. */
 591         err = -EAGAIN;
 592
 593 put_tmpl:
 594         crypto_tmpl_put(tmpl);
 595 kill_larval:
 596         crypto_larval_kill(larval);
 597 drop_larval:
 598         crypto_mod_put(larval);
 599 out:
 600         crypto_mod_put(alg);
 601         return err;
 602 }
 603
 604 struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, u32 mask)
 605 {
 606         struct crypto_alg *alg;
 607
 608         alg = crypto_alg_mod_lookup(name, type, mask);
 609         if (IS_ERR(alg))
 610                 return alg;
 611
 612         if (alg->cra_type == &crypto_aead_type)
 613                 return alg;
 614
 615         if (!alg->cra_aead.ivsize)
 616                 return alg;
 617
 618         crypto_mod_put(alg);
 619         alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
 620                                     mask & ~CRYPTO_ALG_TESTED);
 621         if (IS_ERR(alg))
 622                 return alg;
 623
 624         if (alg->cra_type == &crypto_aead_type) {
 625                 if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) {
 626                         crypto_mod_put(alg);
 627                         alg = ERR_PTR(-ENOENT);
 628                 }
 629                 return alg;
 630         }
 631
 632         BUG_ON(!alg->cra_aead.ivsize);
 633
 634         return ERR_PTR(crypto_nivaead_default(alg, type, mask));
 635 }
 636 EXPORT_SYMBOL_GPL(crypto_lookup_aead);
 637
 638 int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
 639                      u32 type, u32 mask)
 640 {
 641         spawn->base.frontend = &crypto_aead_type;
 642         return crypto_grab_spawn(&spawn->base, name, type, mask);
 643 }
 644 EXPORT_SYMBOL_GPL(crypto_grab_aead);
 645
 646 struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
 647 {
 648         return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
 649 }
 650 EXPORT_SYMBOL_GPL(crypto_alloc_aead);
 651
 652 static int aead_prepare_alg(struct aead_alg *alg)
 653 {
 654         struct crypto_alg *base = &alg->base;
 655
 656         if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
 657                 return -EINVAL;
 658
 659         base->cra_type = &crypto_new_aead_type;
 660         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 661         base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
 662
 663         return 0;
 664 }
 665
 666 int crypto_register_aead(struct aead_alg *alg)
 667 {
 668         struct crypto_alg *base = &alg->base;
 669         int err;
 670
 671         err = aead_prepare_alg(alg);
 672         if (err)
 673                 return err;
 674
 675         return crypto_register_alg(base);
 676 }
 677 EXPORT_SYMBOL_GPL(crypto_register_aead);
 678
 679 int crypto_unregister_aead(struct aead_alg *alg)
 680 {
 681         return crypto_unregister_alg(&alg->base);
 682 }
 683 EXPORT_SYMBOL_GPL(crypto_unregister_aead);
 684
 685 int aead_register_instance(struct crypto_template *tmpl,
 686                            struct aead_instance *inst)
 687 {
 688         int err;
 689
 690         err = aead_prepare_alg(&inst->alg);
 691         if (err)
 692                 return err;
 693
 694         return crypto_register_instance(tmpl, aead_crypto_instance(inst));
 695 }
 696 EXPORT_SYMBOL_GPL(aead_register_instance);
 697
 698 MODULE_LICENSE("GPL");
 699 MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");