crypto/gcm.c

   1 /*
   2  * GCM: Galois/Counter Mode.
   3  *
   4  * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation.
   9  */
  10
  11 #include <crypto/gf128mul.h>
  12 #include <crypto/internal/aead.h>
  13 #include <crypto/internal/skcipher.h>
  14 #include <crypto/internal/hash.h>
  15 #include <crypto/null.h>
  16 #include <crypto/scatterwalk.h>
  17 #include <crypto/gcm.h>
  18 #include <crypto/hash.h>
  19 #include "internal.h"
  20 #include <linux/err.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25
  26 struct gcm_instance_ctx {
  27         struct crypto_skcipher_spawn ctr;
  28         struct crypto_ahash_spawn ghash;
  29 };
  30
  31 struct crypto_gcm_ctx {
  32         struct crypto_skcipher *ctr;
  33         struct crypto_ahash *ghash;
  34 };
  35
  36 struct crypto_rfc4106_ctx {
  37         struct crypto_aead *child;
  38         u8 nonce[4];
  39 };
  40
  41 struct crypto_rfc4106_req_ctx {
  42         struct scatterlist src[3];
  43         struct scatterlist dst[3];
  44         struct aead_request subreq;
  45 };
  46
  47 struct crypto_rfc4543_instance_ctx {
  48         struct crypto_aead_spawn aead;
  49 };
  50
  51 struct crypto_rfc4543_ctx {
  52         struct crypto_aead *child;
  53         struct crypto_skcipher *null;
  54         u8 nonce[4];
  55 };
  56
  57 struct crypto_rfc4543_req_ctx {
  58         struct aead_request subreq;
  59 };
  60
  61 struct crypto_gcm_ghash_ctx {
  62         unsigned int cryptlen;
  63         struct scatterlist *src;
  64         int (*complete)(struct aead_request *req, u32 flags);
  65 };
  66
  67 struct crypto_gcm_req_priv_ctx {
  68         u8 iv[16];
  69         u8 auth_tag[16];
  70         u8 iauth_tag[16];
  71         struct scatterlist src[3];
  72         struct scatterlist dst[3];
  73         struct scatterlist sg;
  74         struct crypto_gcm_ghash_ctx ghash_ctx;
  75         union {
  76                 struct ahash_request ahreq;
  77                 struct skcipher_request skreq;
  78         } u;
  79 };
  80
  81 static struct {
  82         u8 buf[16];
  83         struct scatterlist sg;
  84 } *gcm_zeroes;
  85
  86 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
  87
  88 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
  89         struct aead_request *req)
  90 {
  91         unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
  92
  93         return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
  94 }
  95
  96 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
  97                              unsigned int keylen)
  98 {
  99         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 100         struct crypto_ahash *ghash = ctx->ghash;
 101         struct crypto_skcipher *ctr = ctx->ctr;
 102         struct {
 103                 be128 hash;
 104                 u8 iv[16];
 105
 106                 struct crypto_wait wait;
 107
 108                 struct scatterlist sg[1];
 109                 struct skcipher_request req;
 110         } *data;
 111         int err;
 112
 113         crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
 114         crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
 115                                        CRYPTO_TFM_REQ_MASK);
 116         err = crypto_skcipher_setkey(ctr, key, keylen);
 117         crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
 118                                     CRYPTO_TFM_RES_MASK);
 119         if (err)
 120                 return err;
 121
 122         data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
 123                        GFP_KERNEL);
 124         if (!data)
 125                 return -ENOMEM;
 126
 127         crypto_init_wait(&data->wait);
 128         sg_init_one(data->sg, &data->hash, sizeof(data->hash));
 129         skcipher_request_set_tfm(&data->req, ctr);
 130         skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
 131                                                   CRYPTO_TFM_REQ_MAY_BACKLOG,
 132                                       crypto_req_done,
 133                                       &data->wait);
 134         skcipher_request_set_crypt(&data->req, data->sg, data->sg,
 135                                    sizeof(data->hash), data->iv);
 136
 137         err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
 138                                                         &data->wait);
 139
 140         if (err)
 141                 goto out;
 142
 143         crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
 144         crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
 145                                CRYPTO_TFM_REQ_MASK);
 146         err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
 147         crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
 148                               CRYPTO_TFM_RES_MASK);
 149
 150 out:
 151         kzfree(data);
 152         return err;
 153 }
 154
 155 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
 156                                   unsigned int authsize)
 157 {
 158         switch (authsize) {
 159         case 4:
 160         case 8:
 161         case 12:
 162         case 13:
 163         case 14:
 164         case 15:
 165         case 16:
 166                 break;
 167         default:
 168                 return -EINVAL;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static void crypto_gcm_init_common(struct aead_request *req)
 175 {
 176         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 177         __be32 counter = cpu_to_be32(1);
 178         struct scatterlist *sg;
 179
 180         memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
 181         memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
 182         memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
 183
 184         sg_init_table(pctx->src, 3);
 185         sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
 186         sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
 187         if (sg != pctx->src + 1)
 188                 sg_chain(pctx->src, 2, sg);
 189
 190         if (req->src != req->dst) {
 191                 sg_init_table(pctx->dst, 3);
 192                 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
 193                 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
 194                 if (sg != pctx->dst + 1)
 195                         sg_chain(pctx->dst, 2, sg);
 196         }
 197 }
 198
 199 static void crypto_gcm_init_crypt(struct aead_request *req,
 200                                   unsigned int cryptlen)
 201 {
 202         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 203         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 204         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 205         struct skcipher_request *skreq = &pctx->u.skreq;
 206         struct scatterlist *dst;
 207
 208         dst = req->src == req->dst ? pctx->src : pctx->dst;
 209
 210         skcipher_request_set_tfm(skreq, ctx->ctr);
 211         skcipher_request_set_crypt(skreq, pctx->src, dst,
 212                                      cryptlen + sizeof(pctx->auth_tag),
 213                                      pctx->iv);
 214 }
 215
 216 static inline unsigned int gcm_remain(unsigned int len)
 217 {
 218         len &= 0xfU;
 219         return len ? 16 - len : 0;
 220 }
 221
 222 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
 223
 224 static int gcm_hash_update(struct aead_request *req,
 225                            crypto_completion_t compl,
 226                            struct scatterlist *src,
 227                            unsigned int len, u32 flags)
 228 {
 229         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 230         struct ahash_request *ahreq = &pctx->u.ahreq;
 231
 232         ahash_request_set_callback(ahreq, flags, compl, req);
 233         ahash_request_set_crypt(ahreq, src, NULL, len);
 234
 235         return crypto_ahash_update(ahreq);
 236 }
 237
 238 static int gcm_hash_remain(struct aead_request *req,
 239                            unsigned int remain,
 240                            crypto_completion_t compl, u32 flags)
 241 {
 242         return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
 243 }
 244
 245 static int gcm_hash_len(struct aead_request *req, u32 flags)
 246 {
 247         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 248         struct ahash_request *ahreq = &pctx->u.ahreq;
 249         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 250         u128 lengths;
 251
 252         lengths.a = cpu_to_be64(req->assoclen * 8);
 253         lengths.b = cpu_to_be64(gctx->cryptlen * 8);
 254         memcpy(pctx->iauth_tag, &lengths, 16);
 255         sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
 256         ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
 257         ahash_request_set_crypt(ahreq, &pctx->sg,
 258                                 pctx->iauth_tag, sizeof(lengths));
 259
 260         return crypto_ahash_finup(ahreq);
 261 }
 262
 263 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
 264 {
 265         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 266         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 267
 268         return gctx->complete(req, flags);
 269 }
 270
 271 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
 272 {
 273         struct aead_request *req = areq->data;
 274
 275         if (err)
 276                 goto out;
 277
 278         err = gcm_hash_len_continue(req, 0);
 279         if (err == -EINPROGRESS)
 280                 return;
 281
 282 out:
 283         aead_request_complete(req, err);
 284 }
 285
 286 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
 287 {
 288         return gcm_hash_len(req, flags) ?:
 289                gcm_hash_len_continue(req, flags);
 290 }
 291
 292 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
 293                                        int err)
 294 {
 295         struct aead_request *req = areq->data;
 296
 297         if (err)
 298                 goto out;
 299
 300         err = gcm_hash_crypt_remain_continue(req, 0);
 301         if (err == -EINPROGRESS)
 302                 return;
 303
 304 out:
 305         aead_request_complete(req, err);
 306 }
 307
 308 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
 309 {
 310         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 311         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 312         unsigned int remain;
 313
 314         remain = gcm_remain(gctx->cryptlen);
 315         if (remain)
 316                 return gcm_hash_remain(req, remain,
 317                                        gcm_hash_crypt_remain_done, flags) ?:
 318                        gcm_hash_crypt_remain_continue(req, flags);
 319
 320         return gcm_hash_crypt_remain_continue(req, flags);
 321 }
 322
 323 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
 324 {
 325         struct aead_request *req = areq->data;
 326
 327         if (err)
 328                 goto out;
 329
 330         err = gcm_hash_crypt_continue(req, 0);
 331         if (err == -EINPROGRESS)
 332                 return;
 333
 334 out:
 335         aead_request_complete(req, err);
 336 }
 337
 338 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
 339 {
 340         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 341         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 342
 343         if (gctx->cryptlen)
 344                 return gcm_hash_update(req, gcm_hash_crypt_done,
 345                                        gctx->src, gctx->cryptlen, flags) ?:
 346                        gcm_hash_crypt_continue(req, flags);
 347
 348         return gcm_hash_crypt_remain_continue(req, flags);
 349 }
 350
 351 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
 352                                        int err)
 353 {
 354         struct aead_request *req = areq->data;
 355
 356         if (err)
 357                 goto out;
 358
 359         err = gcm_hash_assoc_remain_continue(req, 0);
 360         if (err == -EINPROGRESS)
 361                 return;
 362
 363 out:
 364         aead_request_complete(req, err);
 365 }
 366
 367 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
 368 {
 369         unsigned int remain;
 370
 371         remain = gcm_remain(req->assoclen);
 372         if (remain)
 373                 return gcm_hash_remain(req, remain,
 374                                        gcm_hash_assoc_remain_done, flags) ?:
 375                        gcm_hash_assoc_remain_continue(req, flags);
 376
 377         return gcm_hash_assoc_remain_continue(req, flags);
 378 }
 379
 380 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
 381 {
 382         struct aead_request *req = areq->data;
 383
 384         if (err)
 385                 goto out;
 386
 387         err = gcm_hash_assoc_continue(req, 0);
 388         if (err == -EINPROGRESS)
 389                 return;
 390
 391 out:
 392         aead_request_complete(req, err);
 393 }
 394
 395 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
 396 {
 397         if (req->assoclen)
 398                 return gcm_hash_update(req, gcm_hash_assoc_done,
 399                                        req->src, req->assoclen, flags) ?:
 400                        gcm_hash_assoc_continue(req, flags);
 401
 402         return gcm_hash_assoc_remain_continue(req, flags);
 403 }
 404
 405 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
 406 {
 407         struct aead_request *req = areq->data;
 408
 409         if (err)
 410                 goto out;
 411
 412         err = gcm_hash_init_continue(req, 0);
 413         if (err == -EINPROGRESS)
 414                 return;
 415
 416 out:
 417         aead_request_complete(req, err);
 418 }
 419
 420 static int gcm_hash(struct aead_request *req, u32 flags)
 421 {
 422         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 423         struct ahash_request *ahreq = &pctx->u.ahreq;
 424         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
 425
 426         ahash_request_set_tfm(ahreq, ctx->ghash);
 427
 428         ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
 429         return crypto_ahash_init(ahreq) ?:
 430                gcm_hash_init_continue(req, flags);
 431 }
 432
 433 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
 434 {
 435         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 436         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 437         u8 *auth_tag = pctx->auth_tag;
 438
 439         crypto_xor(auth_tag, pctx->iauth_tag, 16);
 440         scatterwalk_map_and_copy(auth_tag, req->dst,
 441                                  req->assoclen + req->cryptlen,
 442                                  crypto_aead_authsize(aead), 1);
 443         return 0;
 444 }
 445
 446 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
 447 {
 448         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 449         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 450
 451         gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
 452         gctx->cryptlen = req->cryptlen;
 453         gctx->complete = gcm_enc_copy_hash;
 454
 455         return gcm_hash(req, flags);
 456 }
 457
 458 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
 459 {
 460         struct aead_request *req = areq->data;
 461
 462         if (err)
 463                 goto out;
 464
 465         err = gcm_encrypt_continue(req, 0);
 466         if (err == -EINPROGRESS)
 467                 return;
 468
 469 out:
 470         aead_request_complete(req, err);
 471 }
 472
 473 static int crypto_gcm_encrypt(struct aead_request *req)
 474 {
 475         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 476         struct skcipher_request *skreq = &pctx->u.skreq;
 477         u32 flags = aead_request_flags(req);
 478
 479         crypto_gcm_init_common(req);
 480         crypto_gcm_init_crypt(req, req->cryptlen);
 481         skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
 482
 483         return crypto_skcipher_encrypt(skreq) ?:
 484                gcm_encrypt_continue(req, flags);
 485 }
 486
 487 static int crypto_gcm_verify(struct aead_request *req)
 488 {
 489         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 490         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 491         u8 *auth_tag = pctx->auth_tag;
 492         u8 *iauth_tag = pctx->iauth_tag;
 493         unsigned int authsize = crypto_aead_authsize(aead);
 494         unsigned int cryptlen = req->cryptlen - authsize;
 495
 496         crypto_xor(auth_tag, iauth_tag, 16);
 497         scatterwalk_map_and_copy(iauth_tag, req->src,
 498                                  req->assoclen + cryptlen, authsize, 0);
 499         return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
 500 }
 501
 502 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
 503 {
 504         struct aead_request *req = areq->data;
 505
 506         if (!err)
 507                 err = crypto_gcm_verify(req);
 508
 509         aead_request_complete(req, err);
 510 }
 511
 512 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
 513 {
 514         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 515         struct skcipher_request *skreq = &pctx->u.skreq;
 516         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 517
 518         crypto_gcm_init_crypt(req, gctx->cryptlen);
 519         skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
 520         return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
 521 }
 522
 523 static int crypto_gcm_decrypt(struct aead_request *req)
 524 {
 525         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 526         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 527         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 528         unsigned int authsize = crypto_aead_authsize(aead);
 529         unsigned int cryptlen = req->cryptlen;
 530         u32 flags = aead_request_flags(req);
 531
 532         cryptlen -= authsize;
 533
 534         crypto_gcm_init_common(req);
 535
 536         gctx->src = sg_next(pctx->src);
 537         gctx->cryptlen = cryptlen;
 538         gctx->complete = gcm_dec_hash_continue;
 539
 540         return gcm_hash(req, flags);
 541 }
 542
 543 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
 544 {
 545         struct aead_instance *inst = aead_alg_instance(tfm);
 546         struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
 547         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
 548         struct crypto_skcipher *ctr;
 549         struct crypto_ahash *ghash;
 550         unsigned long align;
 551         int err;
 552
 553         ghash = crypto_spawn_ahash(&ictx->ghash);
 554         if (IS_ERR(ghash))
 555                 return PTR_ERR(ghash);
 556
 557         ctr = crypto_spawn_skcipher(&ictx->ctr);
 558         err = PTR_ERR(ctr);
 559         if (IS_ERR(ctr))
 560                 goto err_free_hash;
 561
 562         ctx->ctr = ctr;
 563         ctx->ghash = ghash;
 564
 565         align = crypto_aead_alignmask(tfm);
 566         align &= ~(crypto_tfm_ctx_alignment() - 1);
 567         crypto_aead_set_reqsize(tfm,
 568                 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
 569                 max(sizeof(struct skcipher_request) +
 570                     crypto_skcipher_reqsize(ctr),
 571                     sizeof(struct ahash_request) +
 572                     crypto_ahash_reqsize(ghash)));
 573
 574         return 0;
 575
 576 err_free_hash:
 577         crypto_free_ahash(ghash);
 578         return err;
 579 }
 580
 581 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
 582 {
 583         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
 584
 585         crypto_free_ahash(ctx->ghash);
 586         crypto_free_skcipher(ctx->ctr);
 587 }
 588
 589 static void crypto_gcm_free(struct aead_instance *inst)
 590 {
 591         struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
 592
 593         crypto_drop_skcipher(&ctx->ctr);
 594         crypto_drop_ahash(&ctx->ghash);
 595         kfree(inst);
 596 }
 597
 598 static int crypto_gcm_create_common(struct crypto_template *tmpl,
 599                                     struct rtattr **tb,
 600                                     const char *full_name,
 601                                     const char *ctr_name,
 602                                     const char *ghash_name)
 603 {
 604         struct crypto_attr_type *algt;
 605         struct aead_instance *inst;
 606         struct skcipher_alg *ctr;
 607         struct crypto_alg *ghash_alg;
 608         struct hash_alg_common *ghash;
 609         struct gcm_instance_ctx *ctx;
 610         int err;
 611
 612         algt = crypto_get_attr_type(tb);
 613         if (IS_ERR(algt))
 614                 return PTR_ERR(algt);
 615
 616         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 617                 return -EINVAL;
 618
 619         ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
 620                                     CRYPTO_ALG_TYPE_HASH,
 621                                     CRYPTO_ALG_TYPE_AHASH_MASK |
 622                                     crypto_requires_sync(algt->type,
 623                                                          algt->mask));
 624         if (IS_ERR(ghash_alg))
 625                 return PTR_ERR(ghash_alg);
 626
 627         ghash = __crypto_hash_alg_common(ghash_alg);
 628
 629         err = -ENOMEM;
 630         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 631         if (!inst)
 632                 goto out_put_ghash;
 633
 634         ctx = aead_instance_ctx(inst);
 635         err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
 636                                       aead_crypto_instance(inst));
 637         if (err)
 638                 goto err_free_inst;
 639
 640         err = -EINVAL;
 641         if (ghash->digestsize != 16)
 642                 goto err_drop_ghash;
 643
 644         crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
 645         err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
 646                                    crypto_requires_sync(algt->type,
 647                                                         algt->mask));
 648         if (err)
 649                 goto err_drop_ghash;
 650
 651         ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
 652
 653         /* We only support 16-byte blocks. */
 654         err = -EINVAL;
 655         if (crypto_skcipher_alg_ivsize(ctr) != 16)
 656                 goto out_put_ctr;
 657
 658         /* Not a stream cipher? */
 659         if (ctr->base.cra_blocksize != 1)
 660                 goto out_put_ctr;
 661
 662         err = -ENAMETOOLONG;
 663         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 664                      "gcm_base(%s,%s)", ctr->base.cra_driver_name,
 665                      ghash_alg->cra_driver_name) >=
 666             CRYPTO_MAX_ALG_NAME)
 667                 goto out_put_ctr;
 668
 669         memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
 670
 671         inst->alg.base.cra_flags = (ghash->base.cra_flags |
 672                                     ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
 673         inst->alg.base.cra_priority = (ghash->base.cra_priority +
 674                                        ctr->base.cra_priority) / 2;
 675         inst->alg.base.cra_blocksize = 1;
 676         inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
 677                                        ctr->base.cra_alignmask;
 678         inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
 679         inst->alg.ivsize = GCM_AES_IV_SIZE;
 680         inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
 681         inst->alg.maxauthsize = 16;
 682         inst->alg.init = crypto_gcm_init_tfm;
 683         inst->alg.exit = crypto_gcm_exit_tfm;
 684         inst->alg.setkey = crypto_gcm_setkey;
 685         inst->alg.setauthsize = crypto_gcm_setauthsize;
 686         inst->alg.encrypt = crypto_gcm_encrypt;
 687         inst->alg.decrypt = crypto_gcm_decrypt;
 688
 689         inst->free = crypto_gcm_free;
 690
 691         err = aead_register_instance(tmpl, inst);
 692         if (err)
 693                 goto out_put_ctr;
 694
 695 out_put_ghash:
 696         crypto_mod_put(ghash_alg);
 697         return err;
 698
 699 out_put_ctr:
 700         crypto_drop_skcipher(&ctx->ctr);
 701 err_drop_ghash:
 702         crypto_drop_ahash(&ctx->ghash);
 703 err_free_inst:
 704         kfree(inst);
 705         goto out_put_ghash;
 706 }
 707
 708 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
 709 {
 710         const char *cipher_name;
 711         char ctr_name[CRYPTO_MAX_ALG_NAME];
 712         char full_name[CRYPTO_MAX_ALG_NAME];
 713
 714         cipher_name = crypto_attr_alg_name(tb[1]);
 715         if (IS_ERR(cipher_name))
 716                 return PTR_ERR(cipher_name);
 717
 718         if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
 719             CRYPTO_MAX_ALG_NAME)
 720                 return -ENAMETOOLONG;
 721
 722         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
 723             CRYPTO_MAX_ALG_NAME)
 724                 return -ENAMETOOLONG;
 725
 726         return crypto_gcm_create_common(tmpl, tb, full_name,
 727                                         ctr_name, "ghash");
 728 }
 729
 730 static struct crypto_template crypto_gcm_tmpl = {
 731         .name = "gcm",
 732         .create = crypto_gcm_create,
 733         .module = THIS_MODULE,
 734 };
 735
 736 static int crypto_gcm_base_create(struct crypto_template *tmpl,
 737                                   struct rtattr **tb)
 738 {
 739         const char *ctr_name;
 740         const char *ghash_name;
 741         char full_name[CRYPTO_MAX_ALG_NAME];
 742
 743         ctr_name = crypto_attr_alg_name(tb[1]);
 744         if (IS_ERR(ctr_name))
 745                 return PTR_ERR(ctr_name);
 746
 747         ghash_name = crypto_attr_alg_name(tb[2]);
 748         if (IS_ERR(ghash_name))
 749                 return PTR_ERR(ghash_name);
 750
 751         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
 752                      ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
 753                 return -ENAMETOOLONG;
 754
 755         return crypto_gcm_create_common(tmpl, tb, full_name,
 756                                         ctr_name, ghash_name);
 757 }
 758
 759 static struct crypto_template crypto_gcm_base_tmpl = {
 760         .name = "gcm_base",
 761         .create = crypto_gcm_base_create,
 762         .module = THIS_MODULE,
 763 };
 764
 765 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
 766                                  unsigned int keylen)
 767 {
 768         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 769         struct crypto_aead *child = ctx->child;
 770         int err;
 771
 772         if (keylen < 4)
 773                 return -EINVAL;
 774
 775         keylen -= 4;
 776         memcpy(ctx->nonce, key + keylen, 4);
 777
 778         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 779         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 780                                      CRYPTO_TFM_REQ_MASK);
 781         err = crypto_aead_setkey(child, key, keylen);
 782         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 783                                       CRYPTO_TFM_RES_MASK);
 784
 785         return err;
 786 }
 787
 788 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
 789                                       unsigned int authsize)
 790 {
 791         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 792
 793         switch (authsize) {
 794         case 8:
 795         case 12:
 796         case 16:
 797                 break;
 798         default:
 799                 return -EINVAL;
 800         }
 801
 802         return crypto_aead_setauthsize(ctx->child, authsize);
 803 }
 804
 805 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
 806 {
 807         struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
 808         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 809         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
 810         struct aead_request *subreq = &rctx->subreq;
 811         struct crypto_aead *child = ctx->child;
 812         struct scatterlist *sg;
 813         u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
 814                            crypto_aead_alignmask(child) + 1);
 815
 816         scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
 817
 818         memcpy(iv, ctx->nonce, 4);
 819         memcpy(iv + 4, req->iv, 8);
 820
 821         sg_init_table(rctx->src, 3);
 822         sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
 823         sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
 824         if (sg != rctx->src + 1)
 825                 sg_chain(rctx->src, 2, sg);
 826
 827         if (req->src != req->dst) {
 828                 sg_init_table(rctx->dst, 3);
 829                 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
 830                 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
 831                 if (sg != rctx->dst + 1)
 832                         sg_chain(rctx->dst, 2, sg);
 833         }
 834
 835         aead_request_set_tfm(subreq, child);
 836         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
 837                                   req->base.data);
 838         aead_request_set_crypt(subreq, rctx->src,
 839                                req->src == req->dst ? rctx->src : rctx->dst,
 840                                req->cryptlen, iv);
 841         aead_request_set_ad(subreq, req->assoclen - 8);
 842
 843         return subreq;
 844 }
 845
 846 static int crypto_rfc4106_encrypt(struct aead_request *req)
 847 {
 848         if (req->assoclen != 16 && req->assoclen != 20)
 849                 return -EINVAL;
 850
 851         req = crypto_rfc4106_crypt(req);
 852
 853         return crypto_aead_encrypt(req);
 854 }
 855
 856 static int crypto_rfc4106_decrypt(struct aead_request *req)
 857 {
 858         if (req->assoclen != 16 && req->assoclen != 20)
 859                 return -EINVAL;
 860
 861         req = crypto_rfc4106_crypt(req);
 862
 863         return crypto_aead_decrypt(req);
 864 }
 865
 866 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
 867 {
 868         struct aead_instance *inst = aead_alg_instance(tfm);
 869         struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
 870         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 871         struct crypto_aead *aead;
 872         unsigned long align;
 873
 874         aead = crypto_spawn_aead(spawn);
 875         if (IS_ERR(aead))
 876                 return PTR_ERR(aead);
 877
 878         ctx->child = aead;
 879
 880         align = crypto_aead_alignmask(aead);
 881         align &= ~(crypto_tfm_ctx_alignment() - 1);
 882         crypto_aead_set_reqsize(
 883                 tfm,
 884                 sizeof(struct crypto_rfc4106_req_ctx) +
 885                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
 886                 align + 24);
 887
 888         return 0;
 889 }
 890
 891 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
 892 {
 893         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 894
 895         crypto_free_aead(ctx->child);
 896 }
 897
 898 static void crypto_rfc4106_free(struct aead_instance *inst)
 899 {
 900         crypto_drop_aead(aead_instance_ctx(inst));
 901         kfree(inst);
 902 }
 903
 904 static int crypto_rfc4106_create(struct crypto_template *tmpl,
 905                                  struct rtattr **tb)
 906 {
 907         struct crypto_attr_type *algt;
 908         struct aead_instance *inst;
 909         struct crypto_aead_spawn *spawn;
 910         struct aead_alg *alg;
 911         const char *ccm_name;
 912         int err;
 913
 914         algt = crypto_get_attr_type(tb);
 915         if (IS_ERR(algt))
 916                 return PTR_ERR(algt);
 917
 918         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 919                 return -EINVAL;
 920
 921         ccm_name = crypto_attr_alg_name(tb[1]);
 922         if (IS_ERR(ccm_name))
 923                 return PTR_ERR(ccm_name);
 924
 925         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 926         if (!inst)
 927                 return -ENOMEM;
 928
 929         spawn = aead_instance_ctx(inst);
 930         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
 931         err = crypto_grab_aead(spawn, ccm_name, 0,
 932                                crypto_requires_sync(algt->type, algt->mask));
 933         if (err)
 934                 goto out_free_inst;
 935
 936         alg = crypto_spawn_aead_alg(spawn);
 937
 938         err = -EINVAL;
 939
 940         /* Underlying IV size must be 12. */
 941         if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
 942                 goto out_drop_alg;
 943
 944         /* Not a stream cipher? */
 945         if (alg->base.cra_blocksize != 1)
 946                 goto out_drop_alg;
 947
 948         err = -ENAMETOOLONG;
 949         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 950                      "rfc4106(%s)", alg->base.cra_name) >=
 951             CRYPTO_MAX_ALG_NAME ||
 952             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 953                      "rfc4106(%s)", alg->base.cra_driver_name) >=
 954             CRYPTO_MAX_ALG_NAME)
 955                 goto out_drop_alg;
 956
 957         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
 958         inst->alg.base.cra_priority = alg->base.cra_priority;
 959         inst->alg.base.cra_blocksize = 1;
 960         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
 961
 962         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
 963
 964         inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
 965         inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
 966         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 967
 968         inst->alg.init = crypto_rfc4106_init_tfm;
 969         inst->alg.exit = crypto_rfc4106_exit_tfm;
 970
 971         inst->alg.setkey = crypto_rfc4106_setkey;
 972         inst->alg.setauthsize = crypto_rfc4106_setauthsize;
 973         inst->alg.encrypt = crypto_rfc4106_encrypt;
 974         inst->alg.decrypt = crypto_rfc4106_decrypt;
 975
 976         inst->free = crypto_rfc4106_free;
 977
 978         err = aead_register_instance(tmpl, inst);
 979         if (err)
 980                 goto out_drop_alg;
 981
 982 out:
 983         return err;
 984
 985 out_drop_alg:
 986         crypto_drop_aead(spawn);
 987 out_free_inst:
 988         kfree(inst);
 989         goto out;
 990 }
 991
 992 static struct crypto_template crypto_rfc4106_tmpl = {
 993         .name = "rfc4106",
 994         .create = crypto_rfc4106_create,
 995         .module = THIS_MODULE,
 996 };
 997
 998 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
 999                                  unsigned int keylen)
1000 {
1001         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1002         struct crypto_aead *child = ctx->child;
1003         int err;
1004
1005         if (keylen < 4)
1006                 return -EINVAL;
1007
1008         keylen -= 4;
1009         memcpy(ctx->nonce, key + keylen, 4);
1010
1011         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1012         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1013                                      CRYPTO_TFM_REQ_MASK);
1014         err = crypto_aead_setkey(child, key, keylen);
1015         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1016                                       CRYPTO_TFM_RES_MASK);
1017
1018         return err;
1019 }
1020
1021 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1022                                       unsigned int authsize)
1023 {
1024         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1025
1026         if (authsize != 16)
1027                 return -EINVAL;
1028
1029         return crypto_aead_setauthsize(ctx->child, authsize);
1030 }
1031
1032 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1033 {
1034         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1035         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1036         struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1037         struct aead_request *subreq = &rctx->subreq;
1038         unsigned int authsize = crypto_aead_authsize(aead);
1039         u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1040                            crypto_aead_alignmask(ctx->child) + 1);
1041         int err;
1042
1043         if (req->src != req->dst) {
1044                 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1045                 if (err)
1046                         return err;
1047         }
1048
1049         memcpy(iv, ctx->nonce, 4);
1050         memcpy(iv + 4, req->iv, 8);
1051
1052         aead_request_set_tfm(subreq, ctx->child);
1053         aead_request_set_callback(subreq, req->base.flags,
1054                                   req->base.complete, req->base.data);
1055         aead_request_set_crypt(subreq, req->src, req->dst,
1056                                enc ? 0 : authsize, iv);
1057         aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1058                                     subreq->cryptlen);
1059
1060         return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1061 }
1062
1063 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1064 {
1065         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1066         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1067         unsigned int authsize = crypto_aead_authsize(aead);
1068         unsigned int nbytes = req->assoclen + req->cryptlen -
1069                               (enc ? 0 : authsize);
1070         SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1071
1072         skcipher_request_set_tfm(nreq, ctx->null);
1073         skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1074         skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1075
1076         return crypto_skcipher_encrypt(nreq);
1077 }
1078
1079 static int crypto_rfc4543_encrypt(struct aead_request *req)
1080 {
1081         return crypto_rfc4543_crypt(req, true);
1082 }
1083
1084 static int crypto_rfc4543_decrypt(struct aead_request *req)
1085 {
1086         return crypto_rfc4543_crypt(req, false);
1087 }
1088
1089 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1090 {
1091         struct aead_instance *inst = aead_alg_instance(tfm);
1092         struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1093         struct crypto_aead_spawn *spawn = &ictx->aead;
1094         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1095         struct crypto_aead *aead;
1096         struct crypto_skcipher *null;
1097         unsigned long align;
1098         int err = 0;
1099
1100         aead = crypto_spawn_aead(spawn);
1101         if (IS_ERR(aead))
1102                 return PTR_ERR(aead);
1103
1104         null = crypto_get_default_null_skcipher();
1105         err = PTR_ERR(null);
1106         if (IS_ERR(null))
1107                 goto err_free_aead;
1108
1109         ctx->child = aead;
1110         ctx->null = null;
1111
1112         align = crypto_aead_alignmask(aead);
1113         align &= ~(crypto_tfm_ctx_alignment() - 1);
1114         crypto_aead_set_reqsize(
1115                 tfm,
1116                 sizeof(struct crypto_rfc4543_req_ctx) +
1117                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1118                 align + GCM_AES_IV_SIZE);
1119
1120         return 0;
1121
1122 err_free_aead:
1123         crypto_free_aead(aead);
1124         return err;
1125 }
1126
1127 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1128 {
1129         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1130
1131         crypto_free_aead(ctx->child);
1132         crypto_put_default_null_skcipher();
1133 }
1134
1135 static void crypto_rfc4543_free(struct aead_instance *inst)
1136 {
1137         struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1138
1139         crypto_drop_aead(&ctx->aead);
1140
1141         kfree(inst);
1142 }
1143
1144 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1145                                 struct rtattr **tb)
1146 {
1147         struct crypto_attr_type *algt;
1148         struct aead_instance *inst;
1149         struct crypto_aead_spawn *spawn;
1150         struct aead_alg *alg;
1151         struct crypto_rfc4543_instance_ctx *ctx;
1152         const char *ccm_name;
1153         int err;
1154
1155         algt = crypto_get_attr_type(tb);
1156         if (IS_ERR(algt))
1157                 return PTR_ERR(algt);
1158
1159         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1160                 return -EINVAL;
1161
1162         ccm_name = crypto_attr_alg_name(tb[1]);
1163         if (IS_ERR(ccm_name))
1164                 return PTR_ERR(ccm_name);
1165
1166         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1167         if (!inst)
1168                 return -ENOMEM;
1169
1170         ctx = aead_instance_ctx(inst);
1171         spawn = &ctx->aead;
1172         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1173         err = crypto_grab_aead(spawn, ccm_name, 0,
1174                                crypto_requires_sync(algt->type, algt->mask));
1175         if (err)
1176                 goto out_free_inst;
1177
1178         alg = crypto_spawn_aead_alg(spawn);
1179
1180         err = -EINVAL;
1181
1182         /* Underlying IV size must be 12. */
1183         if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1184                 goto out_drop_alg;
1185
1186         /* Not a stream cipher? */
1187         if (alg->base.cra_blocksize != 1)
1188                 goto out_drop_alg;
1189
1190         err = -ENAMETOOLONG;
1191         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1192                      "rfc4543(%s)", alg->base.cra_name) >=
1193             CRYPTO_MAX_ALG_NAME ||
1194             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1195                      "rfc4543(%s)", alg->base.cra_driver_name) >=
1196             CRYPTO_MAX_ALG_NAME)
1197                 goto out_drop_alg;
1198
1199         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1200         inst->alg.base.cra_priority = alg->base.cra_priority;
1201         inst->alg.base.cra_blocksize = 1;
1202         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1203
1204         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1205
1206         inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1207         inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1208         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1209
1210         inst->alg.init = crypto_rfc4543_init_tfm;
1211         inst->alg.exit = crypto_rfc4543_exit_tfm;
1212
1213         inst->alg.setkey = crypto_rfc4543_setkey;
1214         inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1215         inst->alg.encrypt = crypto_rfc4543_encrypt;
1216         inst->alg.decrypt = crypto_rfc4543_decrypt;
1217
1218         inst->free = crypto_rfc4543_free,
1219
1220         err = aead_register_instance(tmpl, inst);
1221         if (err)
1222                 goto out_drop_alg;
1223
1224 out:
1225         return err;
1226
1227 out_drop_alg:
1228         crypto_drop_aead(spawn);
1229 out_free_inst:
1230         kfree(inst);
1231         goto out;
1232 }
1233
1234 static struct crypto_template crypto_rfc4543_tmpl = {
1235         .name = "rfc4543",
1236         .create = crypto_rfc4543_create,
1237         .module = THIS_MODULE,
1238 };
1239
1240 static int __init crypto_gcm_module_init(void)
1241 {
1242         int err;
1243
1244         gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1245         if (!gcm_zeroes)
1246                 return -ENOMEM;
1247
1248         sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1249
1250         err = crypto_register_template(&crypto_gcm_base_tmpl);
1251         if (err)
1252                 goto out;
1253
1254         err = crypto_register_template(&crypto_gcm_tmpl);
1255         if (err)
1256                 goto out_undo_base;
1257
1258         err = crypto_register_template(&crypto_rfc4106_tmpl);
1259         if (err)
1260                 goto out_undo_gcm;
1261
1262         err = crypto_register_template(&crypto_rfc4543_tmpl);
1263         if (err)
1264                 goto out_undo_rfc4106;
1265
1266         return 0;
1267
1268 out_undo_rfc4106:
1269         crypto_unregister_template(&crypto_rfc4106_tmpl);
1270 out_undo_gcm:
1271         crypto_unregister_template(&crypto_gcm_tmpl);
1272 out_undo_base:
1273         crypto_unregister_template(&crypto_gcm_base_tmpl);
1274 out:
1275         kfree(gcm_zeroes);
1276         return err;
1277 }
1278
1279 static void __exit crypto_gcm_module_exit(void)
1280 {
1281         kfree(gcm_zeroes);
1282         crypto_unregister_template(&crypto_rfc4543_tmpl);
1283         crypto_unregister_template(&crypto_rfc4106_tmpl);
1284         crypto_unregister_template(&crypto_gcm_tmpl);
1285         crypto_unregister_template(&crypto_gcm_base_tmpl);
1286 }
1287
1288 module_init(crypto_gcm_module_init);
1289 module_exit(crypto_gcm_module_exit);
1290
1291 MODULE_LICENSE("GPL");
1292 MODULE_DESCRIPTION("Galois/Counter Mode");
1293 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1294 MODULE_ALIAS_CRYPTO("gcm_base");
1295 MODULE_ALIAS_CRYPTO("rfc4106");
1296 MODULE_ALIAS_CRYPTO("rfc4543");
1297 MODULE_ALIAS_CRYPTO("gcm");