crypto/gcm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * GCM: Galois/Counter Mode.
   4  *
   5  * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
   6  */
   7
   8 #include <crypto/gf128mul.h>
   9 #include <crypto/internal/aead.h>
  10 #include <crypto/internal/skcipher.h>
  11 #include <crypto/internal/hash.h>
  12 #include <crypto/null.h>
  13 #include <crypto/scatterwalk.h>
  14 #include <crypto/gcm.h>
  15 #include <crypto/hash.h>
  16 #include "internal.h"
  17 #include <linux/err.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22
  23 struct gcm_instance_ctx {
  24         struct crypto_skcipher_spawn ctr;
  25         struct crypto_ahash_spawn ghash;
  26 };
  27
  28 struct crypto_gcm_ctx {
  29         struct crypto_skcipher *ctr;
  30         struct crypto_ahash *ghash;
  31 };
  32
  33 struct crypto_rfc4106_ctx {
  34         struct crypto_aead *child;
  35         u8 nonce[4];
  36 };
  37
  38 struct crypto_rfc4106_req_ctx {
  39         struct scatterlist src[3];
  40         struct scatterlist dst[3];
  41         struct aead_request subreq;
  42 };
  43
  44 struct crypto_rfc4543_instance_ctx {
  45         struct crypto_aead_spawn aead;
  46 };
  47
  48 struct crypto_rfc4543_ctx {
  49         struct crypto_aead *child;
  50         struct crypto_sync_skcipher *null;
  51         u8 nonce[4];
  52 };
  53
  54 struct crypto_rfc4543_req_ctx {
  55         struct aead_request subreq;
  56 };
  57
  58 struct crypto_gcm_ghash_ctx {
  59         unsigned int cryptlen;
  60         struct scatterlist *src;
  61         int (*complete)(struct aead_request *req, u32 flags);
  62 };
  63
  64 struct crypto_gcm_req_priv_ctx {
  65         u8 iv[16];
  66         u8 auth_tag[16];
  67         u8 iauth_tag[16];
  68         struct scatterlist src[3];
  69         struct scatterlist dst[3];
  70         struct scatterlist sg;
  71         struct crypto_gcm_ghash_ctx ghash_ctx;
  72         union {
  73                 struct ahash_request ahreq;
  74                 struct skcipher_request skreq;
  75         } u;
  76 };
  77
  78 static struct {
  79         u8 buf[16];
  80         struct scatterlist sg;
  81 } *gcm_zeroes;
  82
  83 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
  84
  85 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
  86         struct aead_request *req)
  87 {
  88         unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
  89
  90         return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
  91 }
  92
  93 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
  94                              unsigned int keylen)
  95 {
  96         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
  97         struct crypto_ahash *ghash = ctx->ghash;
  98         struct crypto_skcipher *ctr = ctx->ctr;
  99         struct {
 100                 be128 hash;
 101                 u8 iv[16];
 102
 103                 struct crypto_wait wait;
 104
 105                 struct scatterlist sg[1];
 106                 struct skcipher_request req;
 107         } *data;
 108         int err;
 109
 110         crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
 111         crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
 112                                        CRYPTO_TFM_REQ_MASK);
 113         err = crypto_skcipher_setkey(ctr, key, keylen);
 114         crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
 115                                     CRYPTO_TFM_RES_MASK);
 116         if (err)
 117                 return err;
 118
 119         data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
 120                        GFP_KERNEL);
 121         if (!data)
 122                 return -ENOMEM;
 123
 124         crypto_init_wait(&data->wait);
 125         sg_init_one(data->sg, &data->hash, sizeof(data->hash));
 126         skcipher_request_set_tfm(&data->req, ctr);
 127         skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
 128                                                   CRYPTO_TFM_REQ_MAY_BACKLOG,
 129                                       crypto_req_done,
 130                                       &data->wait);
 131         skcipher_request_set_crypt(&data->req, data->sg, data->sg,
 132                                    sizeof(data->hash), data->iv);
 133
 134         err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
 135                                                         &data->wait);
 136
 137         if (err)
 138                 goto out;
 139
 140         crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
 141         crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
 142                                CRYPTO_TFM_REQ_MASK);
 143         err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
 144         crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
 145                               CRYPTO_TFM_RES_MASK);
 146
 147 out:
 148         kzfree(data);
 149         return err;
 150 }
 151
 152 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
 153                                   unsigned int authsize)
 154 {
 155         switch (authsize) {
 156         case 4:
 157         case 8:
 158         case 12:
 159         case 13:
 160         case 14:
 161         case 15:
 162         case 16:
 163                 break;
 164         default:
 165                 return -EINVAL;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static void crypto_gcm_init_common(struct aead_request *req)
 172 {
 173         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 174         __be32 counter = cpu_to_be32(1);
 175         struct scatterlist *sg;
 176
 177         memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
 178         memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
 179         memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
 180
 181         sg_init_table(pctx->src, 3);
 182         sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
 183         sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
 184         if (sg != pctx->src + 1)
 185                 sg_chain(pctx->src, 2, sg);
 186
 187         if (req->src != req->dst) {
 188                 sg_init_table(pctx->dst, 3);
 189                 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
 190                 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
 191                 if (sg != pctx->dst + 1)
 192                         sg_chain(pctx->dst, 2, sg);
 193         }
 194 }
 195
 196 static void crypto_gcm_init_crypt(struct aead_request *req,
 197                                   unsigned int cryptlen)
 198 {
 199         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 200         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 201         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 202         struct skcipher_request *skreq = &pctx->u.skreq;
 203         struct scatterlist *dst;
 204
 205         dst = req->src == req->dst ? pctx->src : pctx->dst;
 206
 207         skcipher_request_set_tfm(skreq, ctx->ctr);
 208         skcipher_request_set_crypt(skreq, pctx->src, dst,
 209                                      cryptlen + sizeof(pctx->auth_tag),
 210                                      pctx->iv);
 211 }
 212
 213 static inline unsigned int gcm_remain(unsigned int len)
 214 {
 215         len &= 0xfU;
 216         return len ? 16 - len : 0;
 217 }
 218
 219 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
 220
 221 static int gcm_hash_update(struct aead_request *req,
 222                            crypto_completion_t compl,
 223                            struct scatterlist *src,
 224                            unsigned int len, u32 flags)
 225 {
 226         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 227         struct ahash_request *ahreq = &pctx->u.ahreq;
 228
 229         ahash_request_set_callback(ahreq, flags, compl, req);
 230         ahash_request_set_crypt(ahreq, src, NULL, len);
 231
 232         return crypto_ahash_update(ahreq);
 233 }
 234
 235 static int gcm_hash_remain(struct aead_request *req,
 236                            unsigned int remain,
 237                            crypto_completion_t compl, u32 flags)
 238 {
 239         return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
 240 }
 241
 242 static int gcm_hash_len(struct aead_request *req, u32 flags)
 243 {
 244         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 245         struct ahash_request *ahreq = &pctx->u.ahreq;
 246         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 247         be128 lengths;
 248
 249         lengths.a = cpu_to_be64(req->assoclen * 8);
 250         lengths.b = cpu_to_be64(gctx->cryptlen * 8);
 251         memcpy(pctx->iauth_tag, &lengths, 16);
 252         sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
 253         ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
 254         ahash_request_set_crypt(ahreq, &pctx->sg,
 255                                 pctx->iauth_tag, sizeof(lengths));
 256
 257         return crypto_ahash_finup(ahreq);
 258 }
 259
 260 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
 261 {
 262         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 263         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 264
 265         return gctx->complete(req, flags);
 266 }
 267
 268 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
 269 {
 270         struct aead_request *req = areq->data;
 271
 272         if (err)
 273                 goto out;
 274
 275         err = gcm_hash_len_continue(req, 0);
 276         if (err == -EINPROGRESS)
 277                 return;
 278
 279 out:
 280         aead_request_complete(req, err);
 281 }
 282
 283 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
 284 {
 285         return gcm_hash_len(req, flags) ?:
 286                gcm_hash_len_continue(req, flags);
 287 }
 288
 289 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
 290                                        int err)
 291 {
 292         struct aead_request *req = areq->data;
 293
 294         if (err)
 295                 goto out;
 296
 297         err = gcm_hash_crypt_remain_continue(req, 0);
 298         if (err == -EINPROGRESS)
 299                 return;
 300
 301 out:
 302         aead_request_complete(req, err);
 303 }
 304
 305 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
 306 {
 307         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 308         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 309         unsigned int remain;
 310
 311         remain = gcm_remain(gctx->cryptlen);
 312         if (remain)
 313                 return gcm_hash_remain(req, remain,
 314                                        gcm_hash_crypt_remain_done, flags) ?:
 315                        gcm_hash_crypt_remain_continue(req, flags);
 316
 317         return gcm_hash_crypt_remain_continue(req, flags);
 318 }
 319
 320 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
 321 {
 322         struct aead_request *req = areq->data;
 323
 324         if (err)
 325                 goto out;
 326
 327         err = gcm_hash_crypt_continue(req, 0);
 328         if (err == -EINPROGRESS)
 329                 return;
 330
 331 out:
 332         aead_request_complete(req, err);
 333 }
 334
 335 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
 336 {
 337         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 338         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 339
 340         if (gctx->cryptlen)
 341                 return gcm_hash_update(req, gcm_hash_crypt_done,
 342                                        gctx->src, gctx->cryptlen, flags) ?:
 343                        gcm_hash_crypt_continue(req, flags);
 344
 345         return gcm_hash_crypt_remain_continue(req, flags);
 346 }
 347
 348 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
 349                                        int err)
 350 {
 351         struct aead_request *req = areq->data;
 352
 353         if (err)
 354                 goto out;
 355
 356         err = gcm_hash_assoc_remain_continue(req, 0);
 357         if (err == -EINPROGRESS)
 358                 return;
 359
 360 out:
 361         aead_request_complete(req, err);
 362 }
 363
 364 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
 365 {
 366         unsigned int remain;
 367
 368         remain = gcm_remain(req->assoclen);
 369         if (remain)
 370                 return gcm_hash_remain(req, remain,
 371                                        gcm_hash_assoc_remain_done, flags) ?:
 372                        gcm_hash_assoc_remain_continue(req, flags);
 373
 374         return gcm_hash_assoc_remain_continue(req, flags);
 375 }
 376
 377 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
 378 {
 379         struct aead_request *req = areq->data;
 380
 381         if (err)
 382                 goto out;
 383
 384         err = gcm_hash_assoc_continue(req, 0);
 385         if (err == -EINPROGRESS)
 386                 return;
 387
 388 out:
 389         aead_request_complete(req, err);
 390 }
 391
 392 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
 393 {
 394         if (req->assoclen)
 395                 return gcm_hash_update(req, gcm_hash_assoc_done,
 396                                        req->src, req->assoclen, flags) ?:
 397                        gcm_hash_assoc_continue(req, flags);
 398
 399         return gcm_hash_assoc_remain_continue(req, flags);
 400 }
 401
 402 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
 403 {
 404         struct aead_request *req = areq->data;
 405
 406         if (err)
 407                 goto out;
 408
 409         err = gcm_hash_init_continue(req, 0);
 410         if (err == -EINPROGRESS)
 411                 return;
 412
 413 out:
 414         aead_request_complete(req, err);
 415 }
 416
 417 static int gcm_hash(struct aead_request *req, u32 flags)
 418 {
 419         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 420         struct ahash_request *ahreq = &pctx->u.ahreq;
 421         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
 422
 423         ahash_request_set_tfm(ahreq, ctx->ghash);
 424
 425         ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
 426         return crypto_ahash_init(ahreq) ?:
 427                gcm_hash_init_continue(req, flags);
 428 }
 429
 430 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
 431 {
 432         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 433         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 434         u8 *auth_tag = pctx->auth_tag;
 435
 436         crypto_xor(auth_tag, pctx->iauth_tag, 16);
 437         scatterwalk_map_and_copy(auth_tag, req->dst,
 438                                  req->assoclen + req->cryptlen,
 439                                  crypto_aead_authsize(aead), 1);
 440         return 0;
 441 }
 442
 443 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
 444 {
 445         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 446         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 447
 448         gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
 449         gctx->cryptlen = req->cryptlen;
 450         gctx->complete = gcm_enc_copy_hash;
 451
 452         return gcm_hash(req, flags);
 453 }
 454
 455 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
 456 {
 457         struct aead_request *req = areq->data;
 458
 459         if (err)
 460                 goto out;
 461
 462         err = gcm_encrypt_continue(req, 0);
 463         if (err == -EINPROGRESS)
 464                 return;
 465
 466 out:
 467         aead_request_complete(req, err);
 468 }
 469
 470 static int crypto_gcm_encrypt(struct aead_request *req)
 471 {
 472         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 473         struct skcipher_request *skreq = &pctx->u.skreq;
 474         u32 flags = aead_request_flags(req);
 475
 476         crypto_gcm_init_common(req);
 477         crypto_gcm_init_crypt(req, req->cryptlen);
 478         skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
 479
 480         return crypto_skcipher_encrypt(skreq) ?:
 481                gcm_encrypt_continue(req, flags);
 482 }
 483
 484 static int crypto_gcm_verify(struct aead_request *req)
 485 {
 486         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 487         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 488         u8 *auth_tag = pctx->auth_tag;
 489         u8 *iauth_tag = pctx->iauth_tag;
 490         unsigned int authsize = crypto_aead_authsize(aead);
 491         unsigned int cryptlen = req->cryptlen - authsize;
 492
 493         crypto_xor(auth_tag, iauth_tag, 16);
 494         scatterwalk_map_and_copy(iauth_tag, req->src,
 495                                  req->assoclen + cryptlen, authsize, 0);
 496         return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
 497 }
 498
 499 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
 500 {
 501         struct aead_request *req = areq->data;
 502
 503         if (!err)
 504                 err = crypto_gcm_verify(req);
 505
 506         aead_request_complete(req, err);
 507 }
 508
 509 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
 510 {
 511         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 512         struct skcipher_request *skreq = &pctx->u.skreq;
 513         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 514
 515         crypto_gcm_init_crypt(req, gctx->cryptlen);
 516         skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
 517         return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
 518 }
 519
 520 static int crypto_gcm_decrypt(struct aead_request *req)
 521 {
 522         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 523         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 524         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 525         unsigned int authsize = crypto_aead_authsize(aead);
 526         unsigned int cryptlen = req->cryptlen;
 527         u32 flags = aead_request_flags(req);
 528
 529         cryptlen -= authsize;
 530
 531         crypto_gcm_init_common(req);
 532
 533         gctx->src = sg_next(pctx->src);
 534         gctx->cryptlen = cryptlen;
 535         gctx->complete = gcm_dec_hash_continue;
 536
 537         return gcm_hash(req, flags);
 538 }
 539
 540 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
 541 {
 542         struct aead_instance *inst = aead_alg_instance(tfm);
 543         struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
 544         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
 545         struct crypto_skcipher *ctr;
 546         struct crypto_ahash *ghash;
 547         unsigned long align;
 548         int err;
 549
 550         ghash = crypto_spawn_ahash(&ictx->ghash);
 551         if (IS_ERR(ghash))
 552                 return PTR_ERR(ghash);
 553
 554         ctr = crypto_spawn_skcipher(&ictx->ctr);
 555         err = PTR_ERR(ctr);
 556         if (IS_ERR(ctr))
 557                 goto err_free_hash;
 558
 559         ctx->ctr = ctr;
 560         ctx->ghash = ghash;
 561
 562         align = crypto_aead_alignmask(tfm);
 563         align &= ~(crypto_tfm_ctx_alignment() - 1);
 564         crypto_aead_set_reqsize(tfm,
 565                 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
 566                 max(sizeof(struct skcipher_request) +
 567                     crypto_skcipher_reqsize(ctr),
 568                     sizeof(struct ahash_request) +
 569                     crypto_ahash_reqsize(ghash)));
 570
 571         return 0;
 572
 573 err_free_hash:
 574         crypto_free_ahash(ghash);
 575         return err;
 576 }
 577
 578 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
 579 {
 580         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
 581
 582         crypto_free_ahash(ctx->ghash);
 583         crypto_free_skcipher(ctx->ctr);
 584 }
 585
 586 static void crypto_gcm_free(struct aead_instance *inst)
 587 {
 588         struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
 589
 590         crypto_drop_skcipher(&ctx->ctr);
 591         crypto_drop_ahash(&ctx->ghash);
 592         kfree(inst);
 593 }
 594
 595 static int crypto_gcm_create_common(struct crypto_template *tmpl,
 596                                     struct rtattr **tb,
 597                                     const char *ctr_name,
 598                                     const char *ghash_name)
 599 {
 600         struct crypto_attr_type *algt;
 601         struct aead_instance *inst;
 602         struct skcipher_alg *ctr;
 603         struct crypto_alg *ghash_alg;
 604         struct hash_alg_common *ghash;
 605         struct gcm_instance_ctx *ctx;
 606         int err;
 607
 608         algt = crypto_get_attr_type(tb);
 609         if (IS_ERR(algt))
 610                 return PTR_ERR(algt);
 611
 612         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 613                 return -EINVAL;
 614
 615         ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
 616                                     CRYPTO_ALG_TYPE_HASH,
 617                                     CRYPTO_ALG_TYPE_AHASH_MASK |
 618                                     crypto_requires_sync(algt->type,
 619                                                          algt->mask));
 620         if (IS_ERR(ghash_alg))
 621                 return PTR_ERR(ghash_alg);
 622
 623         ghash = __crypto_hash_alg_common(ghash_alg);
 624
 625         err = -ENOMEM;
 626         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 627         if (!inst)
 628                 goto out_put_ghash;
 629
 630         ctx = aead_instance_ctx(inst);
 631         err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
 632                                       aead_crypto_instance(inst));
 633         if (err)
 634                 goto err_free_inst;
 635
 636         err = -EINVAL;
 637         if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
 638             ghash->digestsize != 16)
 639                 goto err_drop_ghash;
 640
 641         crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
 642         err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
 643                                    crypto_requires_sync(algt->type,
 644                                                         algt->mask));
 645         if (err)
 646                 goto err_drop_ghash;
 647
 648         ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
 649
 650         /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
 651         err = -EINVAL;
 652         if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
 653             crypto_skcipher_alg_ivsize(ctr) != 16 ||
 654             ctr->base.cra_blocksize != 1)
 655                 goto out_put_ctr;
 656
 657         err = -ENAMETOOLONG;
 658         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 659                      "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
 660                 goto out_put_ctr;
 661
 662         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 663                      "gcm_base(%s,%s)", ctr->base.cra_driver_name,
 664                      ghash_alg->cra_driver_name) >=
 665             CRYPTO_MAX_ALG_NAME)
 666                 goto out_put_ctr;
 667
 668         inst->alg.base.cra_flags = (ghash->base.cra_flags |
 669                                     ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
 670         inst->alg.base.cra_priority = (ghash->base.cra_priority +
 671                                        ctr->base.cra_priority) / 2;
 672         inst->alg.base.cra_blocksize = 1;
 673         inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
 674                                        ctr->base.cra_alignmask;
 675         inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
 676         inst->alg.ivsize = GCM_AES_IV_SIZE;
 677         inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
 678         inst->alg.maxauthsize = 16;
 679         inst->alg.init = crypto_gcm_init_tfm;
 680         inst->alg.exit = crypto_gcm_exit_tfm;
 681         inst->alg.setkey = crypto_gcm_setkey;
 682         inst->alg.setauthsize = crypto_gcm_setauthsize;
 683         inst->alg.encrypt = crypto_gcm_encrypt;
 684         inst->alg.decrypt = crypto_gcm_decrypt;
 685
 686         inst->free = crypto_gcm_free;
 687
 688         err = aead_register_instance(tmpl, inst);
 689         if (err)
 690                 goto out_put_ctr;
 691
 692 out_put_ghash:
 693         crypto_mod_put(ghash_alg);
 694         return err;
 695
 696 out_put_ctr:
 697         crypto_drop_skcipher(&ctx->ctr);
 698 err_drop_ghash:
 699         crypto_drop_ahash(&ctx->ghash);
 700 err_free_inst:
 701         kfree(inst);
 702         goto out_put_ghash;
 703 }
 704
 705 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
 706 {
 707         const char *cipher_name;
 708         char ctr_name[CRYPTO_MAX_ALG_NAME];
 709
 710         cipher_name = crypto_attr_alg_name(tb[1]);
 711         if (IS_ERR(cipher_name))
 712                 return PTR_ERR(cipher_name);
 713
 714         if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
 715             CRYPTO_MAX_ALG_NAME)
 716                 return -ENAMETOOLONG;
 717
 718         return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
 719 }
 720
 721 static int crypto_gcm_base_create(struct crypto_template *tmpl,
 722                                   struct rtattr **tb)
 723 {
 724         const char *ctr_name;
 725         const char *ghash_name;
 726
 727         ctr_name = crypto_attr_alg_name(tb[1]);
 728         if (IS_ERR(ctr_name))
 729                 return PTR_ERR(ctr_name);
 730
 731         ghash_name = crypto_attr_alg_name(tb[2]);
 732         if (IS_ERR(ghash_name))
 733                 return PTR_ERR(ghash_name);
 734
 735         return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
 736 }
 737
 738 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
 739                                  unsigned int keylen)
 740 {
 741         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 742         struct crypto_aead *child = ctx->child;
 743         int err;
 744
 745         if (keylen < 4)
 746                 return -EINVAL;
 747
 748         keylen -= 4;
 749         memcpy(ctx->nonce, key + keylen, 4);
 750
 751         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 752         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 753                                      CRYPTO_TFM_REQ_MASK);
 754         err = crypto_aead_setkey(child, key, keylen);
 755         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 756                                       CRYPTO_TFM_RES_MASK);
 757
 758         return err;
 759 }
 760
 761 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
 762                                       unsigned int authsize)
 763 {
 764         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 765
 766         switch (authsize) {
 767         case 8:
 768         case 12:
 769         case 16:
 770                 break;
 771         default:
 772                 return -EINVAL;
 773         }
 774
 775         return crypto_aead_setauthsize(ctx->child, authsize);
 776 }
 777
 778 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
 779 {
 780         struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
 781         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 782         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
 783         struct aead_request *subreq = &rctx->subreq;
 784         struct crypto_aead *child = ctx->child;
 785         struct scatterlist *sg;
 786         u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
 787                            crypto_aead_alignmask(child) + 1);
 788
 789         scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
 790
 791         memcpy(iv, ctx->nonce, 4);
 792         memcpy(iv + 4, req->iv, 8);
 793
 794         sg_init_table(rctx->src, 3);
 795         sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
 796         sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
 797         if (sg != rctx->src + 1)
 798                 sg_chain(rctx->src, 2, sg);
 799
 800         if (req->src != req->dst) {
 801                 sg_init_table(rctx->dst, 3);
 802                 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
 803                 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
 804                 if (sg != rctx->dst + 1)
 805                         sg_chain(rctx->dst, 2, sg);
 806         }
 807
 808         aead_request_set_tfm(subreq, child);
 809         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
 810                                   req->base.data);
 811         aead_request_set_crypt(subreq, rctx->src,
 812                                req->src == req->dst ? rctx->src : rctx->dst,
 813                                req->cryptlen, iv);
 814         aead_request_set_ad(subreq, req->assoclen - 8);
 815
 816         return subreq;
 817 }
 818
 819 static int crypto_rfc4106_encrypt(struct aead_request *req)
 820 {
 821         if (req->assoclen != 16 && req->assoclen != 20)
 822                 return -EINVAL;
 823
 824         req = crypto_rfc4106_crypt(req);
 825
 826         return crypto_aead_encrypt(req);
 827 }
 828
 829 static int crypto_rfc4106_decrypt(struct aead_request *req)
 830 {
 831         if (req->assoclen != 16 && req->assoclen != 20)
 832                 return -EINVAL;
 833
 834         req = crypto_rfc4106_crypt(req);
 835
 836         return crypto_aead_decrypt(req);
 837 }
 838
 839 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
 840 {
 841         struct aead_instance *inst = aead_alg_instance(tfm);
 842         struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
 843         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 844         struct crypto_aead *aead;
 845         unsigned long align;
 846
 847         aead = crypto_spawn_aead(spawn);
 848         if (IS_ERR(aead))
 849                 return PTR_ERR(aead);
 850
 851         ctx->child = aead;
 852
 853         align = crypto_aead_alignmask(aead);
 854         align &= ~(crypto_tfm_ctx_alignment() - 1);
 855         crypto_aead_set_reqsize(
 856                 tfm,
 857                 sizeof(struct crypto_rfc4106_req_ctx) +
 858                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
 859                 align + 24);
 860
 861         return 0;
 862 }
 863
 864 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
 865 {
 866         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 867
 868         crypto_free_aead(ctx->child);
 869 }
 870
 871 static void crypto_rfc4106_free(struct aead_instance *inst)
 872 {
 873         crypto_drop_aead(aead_instance_ctx(inst));
 874         kfree(inst);
 875 }
 876
 877 static int crypto_rfc4106_create(struct crypto_template *tmpl,
 878                                  struct rtattr **tb)
 879 {
 880         struct crypto_attr_type *algt;
 881         struct aead_instance *inst;
 882         struct crypto_aead_spawn *spawn;
 883         struct aead_alg *alg;
 884         const char *ccm_name;
 885         int err;
 886
 887         algt = crypto_get_attr_type(tb);
 888         if (IS_ERR(algt))
 889                 return PTR_ERR(algt);
 890
 891         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 892                 return -EINVAL;
 893
 894         ccm_name = crypto_attr_alg_name(tb[1]);
 895         if (IS_ERR(ccm_name))
 896                 return PTR_ERR(ccm_name);
 897
 898         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 899         if (!inst)
 900                 return -ENOMEM;
 901
 902         spawn = aead_instance_ctx(inst);
 903         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
 904         err = crypto_grab_aead(spawn, ccm_name, 0,
 905                                crypto_requires_sync(algt->type, algt->mask));
 906         if (err)
 907                 goto out_free_inst;
 908
 909         alg = crypto_spawn_aead_alg(spawn);
 910
 911         err = -EINVAL;
 912
 913         /* Underlying IV size must be 12. */
 914         if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
 915                 goto out_drop_alg;
 916
 917         /* Not a stream cipher? */
 918         if (alg->base.cra_blocksize != 1)
 919                 goto out_drop_alg;
 920
 921         err = -ENAMETOOLONG;
 922         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 923                      "rfc4106(%s)", alg->base.cra_name) >=
 924             CRYPTO_MAX_ALG_NAME ||
 925             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 926                      "rfc4106(%s)", alg->base.cra_driver_name) >=
 927             CRYPTO_MAX_ALG_NAME)
 928                 goto out_drop_alg;
 929
 930         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
 931         inst->alg.base.cra_priority = alg->base.cra_priority;
 932         inst->alg.base.cra_blocksize = 1;
 933         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
 934
 935         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
 936
 937         inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
 938         inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
 939         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 940
 941         inst->alg.init = crypto_rfc4106_init_tfm;
 942         inst->alg.exit = crypto_rfc4106_exit_tfm;
 943
 944         inst->alg.setkey = crypto_rfc4106_setkey;
 945         inst->alg.setauthsize = crypto_rfc4106_setauthsize;
 946         inst->alg.encrypt = crypto_rfc4106_encrypt;
 947         inst->alg.decrypt = crypto_rfc4106_decrypt;
 948
 949         inst->free = crypto_rfc4106_free;
 950
 951         err = aead_register_instance(tmpl, inst);
 952         if (err)
 953                 goto out_drop_alg;
 954
 955 out:
 956         return err;
 957
 958 out_drop_alg:
 959         crypto_drop_aead(spawn);
 960 out_free_inst:
 961         kfree(inst);
 962         goto out;
 963 }
 964
 965 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
 966                                  unsigned int keylen)
 967 {
 968         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
 969         struct crypto_aead *child = ctx->child;
 970         int err;
 971
 972         if (keylen < 4)
 973                 return -EINVAL;
 974
 975         keylen -= 4;
 976         memcpy(ctx->nonce, key + keylen, 4);
 977
 978         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 979         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 980                                      CRYPTO_TFM_REQ_MASK);
 981         err = crypto_aead_setkey(child, key, keylen);
 982         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 983                                       CRYPTO_TFM_RES_MASK);
 984
 985         return err;
 986 }
 987
 988 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
 989                                       unsigned int authsize)
 990 {
 991         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
 992
 993         if (authsize != 16)
 994                 return -EINVAL;
 995
 996         return crypto_aead_setauthsize(ctx->child, authsize);
 997 }
 998
 999 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1000 {
1001         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1002         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1003         struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1004         struct aead_request *subreq = &rctx->subreq;
1005         unsigned int authsize = crypto_aead_authsize(aead);
1006         u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1007                            crypto_aead_alignmask(ctx->child) + 1);
1008         int err;
1009
1010         if (req->src != req->dst) {
1011                 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1012                 if (err)
1013                         return err;
1014         }
1015
1016         memcpy(iv, ctx->nonce, 4);
1017         memcpy(iv + 4, req->iv, 8);
1018
1019         aead_request_set_tfm(subreq, ctx->child);
1020         aead_request_set_callback(subreq, req->base.flags,
1021                                   req->base.complete, req->base.data);
1022         aead_request_set_crypt(subreq, req->src, req->dst,
1023                                enc ? 0 : authsize, iv);
1024         aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1025                                     subreq->cryptlen);
1026
1027         return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1028 }
1029
1030 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1031 {
1032         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1033         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1034         unsigned int authsize = crypto_aead_authsize(aead);
1035         unsigned int nbytes = req->assoclen + req->cryptlen -
1036                               (enc ? 0 : authsize);
1037         SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1038
1039         skcipher_request_set_sync_tfm(nreq, ctx->null);
1040         skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1041         skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1042
1043         return crypto_skcipher_encrypt(nreq);
1044 }
1045
1046 static int crypto_rfc4543_encrypt(struct aead_request *req)
1047 {
1048         return crypto_rfc4543_crypt(req, true);
1049 }
1050
1051 static int crypto_rfc4543_decrypt(struct aead_request *req)
1052 {
1053         return crypto_rfc4543_crypt(req, false);
1054 }
1055
1056 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1057 {
1058         struct aead_instance *inst = aead_alg_instance(tfm);
1059         struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1060         struct crypto_aead_spawn *spawn = &ictx->aead;
1061         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1062         struct crypto_aead *aead;
1063         struct crypto_sync_skcipher *null;
1064         unsigned long align;
1065         int err = 0;
1066
1067         aead = crypto_spawn_aead(spawn);
1068         if (IS_ERR(aead))
1069                 return PTR_ERR(aead);
1070
1071         null = crypto_get_default_null_skcipher();
1072         err = PTR_ERR(null);
1073         if (IS_ERR(null))
1074                 goto err_free_aead;
1075
1076         ctx->child = aead;
1077         ctx->null = null;
1078
1079         align = crypto_aead_alignmask(aead);
1080         align &= ~(crypto_tfm_ctx_alignment() - 1);
1081         crypto_aead_set_reqsize(
1082                 tfm,
1083                 sizeof(struct crypto_rfc4543_req_ctx) +
1084                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1085                 align + GCM_AES_IV_SIZE);
1086
1087         return 0;
1088
1089 err_free_aead:
1090         crypto_free_aead(aead);
1091         return err;
1092 }
1093
1094 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1095 {
1096         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1097
1098         crypto_free_aead(ctx->child);
1099         crypto_put_default_null_skcipher();
1100 }
1101
1102 static void crypto_rfc4543_free(struct aead_instance *inst)
1103 {
1104         struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1105
1106         crypto_drop_aead(&ctx->aead);
1107
1108         kfree(inst);
1109 }
1110
1111 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1112                                 struct rtattr **tb)
1113 {
1114         struct crypto_attr_type *algt;
1115         struct aead_instance *inst;
1116         struct crypto_aead_spawn *spawn;
1117         struct aead_alg *alg;
1118         struct crypto_rfc4543_instance_ctx *ctx;
1119         const char *ccm_name;
1120         int err;
1121
1122         algt = crypto_get_attr_type(tb);
1123         if (IS_ERR(algt))
1124                 return PTR_ERR(algt);
1125
1126         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1127                 return -EINVAL;
1128
1129         ccm_name = crypto_attr_alg_name(tb[1]);
1130         if (IS_ERR(ccm_name))
1131                 return PTR_ERR(ccm_name);
1132
1133         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1134         if (!inst)
1135                 return -ENOMEM;
1136
1137         ctx = aead_instance_ctx(inst);
1138         spawn = &ctx->aead;
1139         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1140         err = crypto_grab_aead(spawn, ccm_name, 0,
1141                                crypto_requires_sync(algt->type, algt->mask));
1142         if (err)
1143                 goto out_free_inst;
1144
1145         alg = crypto_spawn_aead_alg(spawn);
1146
1147         err = -EINVAL;
1148
1149         /* Underlying IV size must be 12. */
1150         if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1151                 goto out_drop_alg;
1152
1153         /* Not a stream cipher? */
1154         if (alg->base.cra_blocksize != 1)
1155                 goto out_drop_alg;
1156
1157         err = -ENAMETOOLONG;
1158         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1159                      "rfc4543(%s)", alg->base.cra_name) >=
1160             CRYPTO_MAX_ALG_NAME ||
1161             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1162                      "rfc4543(%s)", alg->base.cra_driver_name) >=
1163             CRYPTO_MAX_ALG_NAME)
1164                 goto out_drop_alg;
1165
1166         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1167         inst->alg.base.cra_priority = alg->base.cra_priority;
1168         inst->alg.base.cra_blocksize = 1;
1169         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1170
1171         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1172
1173         inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1174         inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1175         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1176
1177         inst->alg.init = crypto_rfc4543_init_tfm;
1178         inst->alg.exit = crypto_rfc4543_exit_tfm;
1179
1180         inst->alg.setkey = crypto_rfc4543_setkey;
1181         inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1182         inst->alg.encrypt = crypto_rfc4543_encrypt;
1183         inst->alg.decrypt = crypto_rfc4543_decrypt;
1184
1185         inst->free = crypto_rfc4543_free,
1186
1187         err = aead_register_instance(tmpl, inst);
1188         if (err)
1189                 goto out_drop_alg;
1190
1191 out:
1192         return err;
1193
1194 out_drop_alg:
1195         crypto_drop_aead(spawn);
1196 out_free_inst:
1197         kfree(inst);
1198         goto out;
1199 }
1200
1201 static struct crypto_template crypto_gcm_tmpls[] = {
1202         {
1203                 .name = "gcm_base",
1204                 .create = crypto_gcm_base_create,
1205                 .module = THIS_MODULE,
1206         }, {
1207                 .name = "gcm",
1208                 .create = crypto_gcm_create,
1209                 .module = THIS_MODULE,
1210         }, {
1211                 .name = "rfc4106",
1212                 .create = crypto_rfc4106_create,
1213                 .module = THIS_MODULE,
1214         }, {
1215                 .name = "rfc4543",
1216                 .create = crypto_rfc4543_create,
1217                 .module = THIS_MODULE,
1218         },
1219 };
1220
1221 static int __init crypto_gcm_module_init(void)
1222 {
1223         int err;
1224
1225         gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1226         if (!gcm_zeroes)
1227                 return -ENOMEM;
1228
1229         sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1230
1231         err = crypto_register_templates(crypto_gcm_tmpls,
1232                                         ARRAY_SIZE(crypto_gcm_tmpls));
1233         if (err)
1234                 kfree(gcm_zeroes);
1235
1236         return err;
1237 }
1238
1239 static void __exit crypto_gcm_module_exit(void)
1240 {
1241         kfree(gcm_zeroes);
1242         crypto_unregister_templates(crypto_gcm_tmpls,
1243                                     ARRAY_SIZE(crypto_gcm_tmpls));
1244 }
1245
1246 subsys_initcall(crypto_gcm_module_init);
1247 module_exit(crypto_gcm_module_exit);
1248
1249 MODULE_LICENSE("GPL");
1250 MODULE_DESCRIPTION("Galois/Counter Mode");
1251 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1252 MODULE_ALIAS_CRYPTO("gcm_base");
1253 MODULE_ALIAS_CRYPTO("rfc4106");
1254 MODULE_ALIAS_CRYPTO("rfc4543");
1255 MODULE_ALIAS_CRYPTO("gcm");