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         return crypto_gcm_check_authsize(authsize);
 156 }
 157
 158 static void crypto_gcm_init_common(struct aead_request *req)
 159 {
 160         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 161         __be32 counter = cpu_to_be32(1);
 162         struct scatterlist *sg;
 163
 164         memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
 165         memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
 166         memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
 167
 168         sg_init_table(pctx->src, 3);
 169         sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
 170         sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
 171         if (sg != pctx->src + 1)
 172                 sg_chain(pctx->src, 2, sg);
 173
 174         if (req->src != req->dst) {
 175                 sg_init_table(pctx->dst, 3);
 176                 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
 177                 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
 178                 if (sg != pctx->dst + 1)
 179                         sg_chain(pctx->dst, 2, sg);
 180         }
 181 }
 182
 183 static void crypto_gcm_init_crypt(struct aead_request *req,
 184                                   unsigned int cryptlen)
 185 {
 186         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 187         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 188         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 189         struct skcipher_request *skreq = &pctx->u.skreq;
 190         struct scatterlist *dst;
 191
 192         dst = req->src == req->dst ? pctx->src : pctx->dst;
 193
 194         skcipher_request_set_tfm(skreq, ctx->ctr);
 195         skcipher_request_set_crypt(skreq, pctx->src, dst,
 196                                      cryptlen + sizeof(pctx->auth_tag),
 197                                      pctx->iv);
 198 }
 199
 200 static inline unsigned int gcm_remain(unsigned int len)
 201 {
 202         len &= 0xfU;
 203         return len ? 16 - len : 0;
 204 }
 205
 206 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
 207
 208 static int gcm_hash_update(struct aead_request *req,
 209                            crypto_completion_t compl,
 210                            struct scatterlist *src,
 211                            unsigned int len, u32 flags)
 212 {
 213         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 214         struct ahash_request *ahreq = &pctx->u.ahreq;
 215
 216         ahash_request_set_callback(ahreq, flags, compl, req);
 217         ahash_request_set_crypt(ahreq, src, NULL, len);
 218
 219         return crypto_ahash_update(ahreq);
 220 }
 221
 222 static int gcm_hash_remain(struct aead_request *req,
 223                            unsigned int remain,
 224                            crypto_completion_t compl, u32 flags)
 225 {
 226         return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
 227 }
 228
 229 static int gcm_hash_len(struct aead_request *req, u32 flags)
 230 {
 231         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 232         struct ahash_request *ahreq = &pctx->u.ahreq;
 233         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 234         be128 lengths;
 235
 236         lengths.a = cpu_to_be64(req->assoclen * 8);
 237         lengths.b = cpu_to_be64(gctx->cryptlen * 8);
 238         memcpy(pctx->iauth_tag, &lengths, 16);
 239         sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
 240         ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
 241         ahash_request_set_crypt(ahreq, &pctx->sg,
 242                                 pctx->iauth_tag, sizeof(lengths));
 243
 244         return crypto_ahash_finup(ahreq);
 245 }
 246
 247 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
 248 {
 249         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 250         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 251
 252         return gctx->complete(req, flags);
 253 }
 254
 255 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
 256 {
 257         struct aead_request *req = areq->data;
 258
 259         if (err)
 260                 goto out;
 261
 262         err = gcm_hash_len_continue(req, 0);
 263         if (err == -EINPROGRESS)
 264                 return;
 265
 266 out:
 267         aead_request_complete(req, err);
 268 }
 269
 270 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
 271 {
 272         return gcm_hash_len(req, flags) ?:
 273                gcm_hash_len_continue(req, flags);
 274 }
 275
 276 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
 277                                        int err)
 278 {
 279         struct aead_request *req = areq->data;
 280
 281         if (err)
 282                 goto out;
 283
 284         err = gcm_hash_crypt_remain_continue(req, 0);
 285         if (err == -EINPROGRESS)
 286                 return;
 287
 288 out:
 289         aead_request_complete(req, err);
 290 }
 291
 292 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
 293 {
 294         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 295         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 296         unsigned int remain;
 297
 298         remain = gcm_remain(gctx->cryptlen);
 299         if (remain)
 300                 return gcm_hash_remain(req, remain,
 301                                        gcm_hash_crypt_remain_done, flags) ?:
 302                        gcm_hash_crypt_remain_continue(req, flags);
 303
 304         return gcm_hash_crypt_remain_continue(req, flags);
 305 }
 306
 307 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
 308 {
 309         struct aead_request *req = areq->data;
 310
 311         if (err)
 312                 goto out;
 313
 314         err = gcm_hash_crypt_continue(req, 0);
 315         if (err == -EINPROGRESS)
 316                 return;
 317
 318 out:
 319         aead_request_complete(req, err);
 320 }
 321
 322 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
 323 {
 324         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 325         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 326
 327         if (gctx->cryptlen)
 328                 return gcm_hash_update(req, gcm_hash_crypt_done,
 329                                        gctx->src, gctx->cryptlen, flags) ?:
 330                        gcm_hash_crypt_continue(req, flags);
 331
 332         return gcm_hash_crypt_remain_continue(req, flags);
 333 }
 334
 335 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
 336                                        int err)
 337 {
 338         struct aead_request *req = areq->data;
 339
 340         if (err)
 341                 goto out;
 342
 343         err = gcm_hash_assoc_remain_continue(req, 0);
 344         if (err == -EINPROGRESS)
 345                 return;
 346
 347 out:
 348         aead_request_complete(req, err);
 349 }
 350
 351 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
 352 {
 353         unsigned int remain;
 354
 355         remain = gcm_remain(req->assoclen);
 356         if (remain)
 357                 return gcm_hash_remain(req, remain,
 358                                        gcm_hash_assoc_remain_done, flags) ?:
 359                        gcm_hash_assoc_remain_continue(req, flags);
 360
 361         return gcm_hash_assoc_remain_continue(req, flags);
 362 }
 363
 364 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
 365 {
 366         struct aead_request *req = areq->data;
 367
 368         if (err)
 369                 goto out;
 370
 371         err = gcm_hash_assoc_continue(req, 0);
 372         if (err == -EINPROGRESS)
 373                 return;
 374
 375 out:
 376         aead_request_complete(req, err);
 377 }
 378
 379 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
 380 {
 381         if (req->assoclen)
 382                 return gcm_hash_update(req, gcm_hash_assoc_done,
 383                                        req->src, req->assoclen, flags) ?:
 384                        gcm_hash_assoc_continue(req, flags);
 385
 386         return gcm_hash_assoc_remain_continue(req, flags);
 387 }
 388
 389 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
 390 {
 391         struct aead_request *req = areq->data;
 392
 393         if (err)
 394                 goto out;
 395
 396         err = gcm_hash_init_continue(req, 0);
 397         if (err == -EINPROGRESS)
 398                 return;
 399
 400 out:
 401         aead_request_complete(req, err);
 402 }
 403
 404 static int gcm_hash(struct aead_request *req, u32 flags)
 405 {
 406         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 407         struct ahash_request *ahreq = &pctx->u.ahreq;
 408         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
 409
 410         ahash_request_set_tfm(ahreq, ctx->ghash);
 411
 412         ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
 413         return crypto_ahash_init(ahreq) ?:
 414                gcm_hash_init_continue(req, flags);
 415 }
 416
 417 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
 418 {
 419         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 420         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 421         u8 *auth_tag = pctx->auth_tag;
 422
 423         crypto_xor(auth_tag, pctx->iauth_tag, 16);
 424         scatterwalk_map_and_copy(auth_tag, req->dst,
 425                                  req->assoclen + req->cryptlen,
 426                                  crypto_aead_authsize(aead), 1);
 427         return 0;
 428 }
 429
 430 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
 431 {
 432         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 433         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 434
 435         gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
 436         gctx->cryptlen = req->cryptlen;
 437         gctx->complete = gcm_enc_copy_hash;
 438
 439         return gcm_hash(req, flags);
 440 }
 441
 442 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
 443 {
 444         struct aead_request *req = areq->data;
 445
 446         if (err)
 447                 goto out;
 448
 449         err = gcm_encrypt_continue(req, 0);
 450         if (err == -EINPROGRESS)
 451                 return;
 452
 453 out:
 454         aead_request_complete(req, err);
 455 }
 456
 457 static int crypto_gcm_encrypt(struct aead_request *req)
 458 {
 459         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 460         struct skcipher_request *skreq = &pctx->u.skreq;
 461         u32 flags = aead_request_flags(req);
 462
 463         crypto_gcm_init_common(req);
 464         crypto_gcm_init_crypt(req, req->cryptlen);
 465         skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
 466
 467         return crypto_skcipher_encrypt(skreq) ?:
 468                gcm_encrypt_continue(req, flags);
 469 }
 470
 471 static int crypto_gcm_verify(struct aead_request *req)
 472 {
 473         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 474         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 475         u8 *auth_tag = pctx->auth_tag;
 476         u8 *iauth_tag = pctx->iauth_tag;
 477         unsigned int authsize = crypto_aead_authsize(aead);
 478         unsigned int cryptlen = req->cryptlen - authsize;
 479
 480         crypto_xor(auth_tag, iauth_tag, 16);
 481         scatterwalk_map_and_copy(iauth_tag, req->src,
 482                                  req->assoclen + cryptlen, authsize, 0);
 483         return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
 484 }
 485
 486 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
 487 {
 488         struct aead_request *req = areq->data;
 489
 490         if (!err)
 491                 err = crypto_gcm_verify(req);
 492
 493         aead_request_complete(req, err);
 494 }
 495
 496 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
 497 {
 498         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 499         struct skcipher_request *skreq = &pctx->u.skreq;
 500         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 501
 502         crypto_gcm_init_crypt(req, gctx->cryptlen);
 503         skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
 504         return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
 505 }
 506
 507 static int crypto_gcm_decrypt(struct aead_request *req)
 508 {
 509         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 510         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 511         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 512         unsigned int authsize = crypto_aead_authsize(aead);
 513         unsigned int cryptlen = req->cryptlen;
 514         u32 flags = aead_request_flags(req);
 515
 516         cryptlen -= authsize;
 517
 518         crypto_gcm_init_common(req);
 519
 520         gctx->src = sg_next(pctx->src);
 521         gctx->cryptlen = cryptlen;
 522         gctx->complete = gcm_dec_hash_continue;
 523
 524         return gcm_hash(req, flags);
 525 }
 526
 527 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
 528 {
 529         struct aead_instance *inst = aead_alg_instance(tfm);
 530         struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
 531         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
 532         struct crypto_skcipher *ctr;
 533         struct crypto_ahash *ghash;
 534         unsigned long align;
 535         int err;
 536
 537         ghash = crypto_spawn_ahash(&ictx->ghash);
 538         if (IS_ERR(ghash))
 539                 return PTR_ERR(ghash);
 540
 541         ctr = crypto_spawn_skcipher(&ictx->ctr);
 542         err = PTR_ERR(ctr);
 543         if (IS_ERR(ctr))
 544                 goto err_free_hash;
 545
 546         ctx->ctr = ctr;
 547         ctx->ghash = ghash;
 548
 549         align = crypto_aead_alignmask(tfm);
 550         align &= ~(crypto_tfm_ctx_alignment() - 1);
 551         crypto_aead_set_reqsize(tfm,
 552                 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
 553                 max(sizeof(struct skcipher_request) +
 554                     crypto_skcipher_reqsize(ctr),
 555                     sizeof(struct ahash_request) +
 556                     crypto_ahash_reqsize(ghash)));
 557
 558         return 0;
 559
 560 err_free_hash:
 561         crypto_free_ahash(ghash);
 562         return err;
 563 }
 564
 565 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
 566 {
 567         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
 568
 569         crypto_free_ahash(ctx->ghash);
 570         crypto_free_skcipher(ctx->ctr);
 571 }
 572
 573 static void crypto_gcm_free(struct aead_instance *inst)
 574 {
 575         struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
 576
 577         crypto_drop_skcipher(&ctx->ctr);
 578         crypto_drop_ahash(&ctx->ghash);
 579         kfree(inst);
 580 }
 581
 582 static int crypto_gcm_create_common(struct crypto_template *tmpl,
 583                                     struct rtattr **tb,
 584                                     const char *ctr_name,
 585                                     const char *ghash_name)
 586 {
 587         struct crypto_attr_type *algt;
 588         struct aead_instance *inst;
 589         struct skcipher_alg *ctr;
 590         struct crypto_alg *ghash_alg;
 591         struct hash_alg_common *ghash;
 592         struct gcm_instance_ctx *ctx;
 593         int err;
 594
 595         algt = crypto_get_attr_type(tb);
 596         if (IS_ERR(algt))
 597                 return PTR_ERR(algt);
 598
 599         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 600                 return -EINVAL;
 601
 602         ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
 603                                     CRYPTO_ALG_TYPE_HASH,
 604                                     CRYPTO_ALG_TYPE_AHASH_MASK |
 605                                     crypto_requires_sync(algt->type,
 606                                                          algt->mask));
 607         if (IS_ERR(ghash_alg))
 608                 return PTR_ERR(ghash_alg);
 609
 610         ghash = __crypto_hash_alg_common(ghash_alg);
 611
 612         err = -ENOMEM;
 613         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 614         if (!inst)
 615                 goto out_put_ghash;
 616
 617         ctx = aead_instance_ctx(inst);
 618         err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
 619                                       aead_crypto_instance(inst));
 620         if (err)
 621                 goto err_free_inst;
 622
 623         err = -EINVAL;
 624         if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
 625             ghash->digestsize != 16)
 626                 goto err_drop_ghash;
 627
 628         crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
 629         err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
 630                                    crypto_requires_sync(algt->type,
 631                                                         algt->mask));
 632         if (err)
 633                 goto err_drop_ghash;
 634
 635         ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
 636
 637         /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
 638         err = -EINVAL;
 639         if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
 640             crypto_skcipher_alg_ivsize(ctr) != 16 ||
 641             ctr->base.cra_blocksize != 1)
 642                 goto out_put_ctr;
 643
 644         err = -ENAMETOOLONG;
 645         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 646                      "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
 647                 goto out_put_ctr;
 648
 649         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 650                      "gcm_base(%s,%s)", ctr->base.cra_driver_name,
 651                      ghash_alg->cra_driver_name) >=
 652             CRYPTO_MAX_ALG_NAME)
 653                 goto out_put_ctr;
 654
 655         inst->alg.base.cra_flags = (ghash->base.cra_flags |
 656                                     ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
 657         inst->alg.base.cra_priority = (ghash->base.cra_priority +
 658                                        ctr->base.cra_priority) / 2;
 659         inst->alg.base.cra_blocksize = 1;
 660         inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
 661                                        ctr->base.cra_alignmask;
 662         inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
 663         inst->alg.ivsize = GCM_AES_IV_SIZE;
 664         inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
 665         inst->alg.maxauthsize = 16;
 666         inst->alg.init = crypto_gcm_init_tfm;
 667         inst->alg.exit = crypto_gcm_exit_tfm;
 668         inst->alg.setkey = crypto_gcm_setkey;
 669         inst->alg.setauthsize = crypto_gcm_setauthsize;
 670         inst->alg.encrypt = crypto_gcm_encrypt;
 671         inst->alg.decrypt = crypto_gcm_decrypt;
 672
 673         inst->free = crypto_gcm_free;
 674
 675         err = aead_register_instance(tmpl, inst);
 676         if (err)
 677                 goto out_put_ctr;
 678
 679 out_put_ghash:
 680         crypto_mod_put(ghash_alg);
 681         return err;
 682
 683 out_put_ctr:
 684         crypto_drop_skcipher(&ctx->ctr);
 685 err_drop_ghash:
 686         crypto_drop_ahash(&ctx->ghash);
 687 err_free_inst:
 688         kfree(inst);
 689         goto out_put_ghash;
 690 }
 691
 692 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
 693 {
 694         const char *cipher_name;
 695         char ctr_name[CRYPTO_MAX_ALG_NAME];
 696
 697         cipher_name = crypto_attr_alg_name(tb[1]);
 698         if (IS_ERR(cipher_name))
 699                 return PTR_ERR(cipher_name);
 700
 701         if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
 702             CRYPTO_MAX_ALG_NAME)
 703                 return -ENAMETOOLONG;
 704
 705         return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
 706 }
 707
 708 static int crypto_gcm_base_create(struct crypto_template *tmpl,
 709                                   struct rtattr **tb)
 710 {
 711         const char *ctr_name;
 712         const char *ghash_name;
 713
 714         ctr_name = crypto_attr_alg_name(tb[1]);
 715         if (IS_ERR(ctr_name))
 716                 return PTR_ERR(ctr_name);
 717
 718         ghash_name = crypto_attr_alg_name(tb[2]);
 719         if (IS_ERR(ghash_name))
 720                 return PTR_ERR(ghash_name);
 721
 722         return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
 723 }
 724
 725 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
 726                                  unsigned int keylen)
 727 {
 728         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 729         struct crypto_aead *child = ctx->child;
 730         int err;
 731
 732         if (keylen < 4)
 733                 return -EINVAL;
 734
 735         keylen -= 4;
 736         memcpy(ctx->nonce, key + keylen, 4);
 737
 738         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 739         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 740                                      CRYPTO_TFM_REQ_MASK);
 741         err = crypto_aead_setkey(child, key, keylen);
 742         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 743                                       CRYPTO_TFM_RES_MASK);
 744
 745         return err;
 746 }
 747
 748 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
 749                                       unsigned int authsize)
 750 {
 751         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 752         int err;
 753
 754         err = crypto_rfc4106_check_authsize(authsize);
 755         if (err)
 756                 return err;
 757
 758         return crypto_aead_setauthsize(ctx->child, authsize);
 759 }
 760
 761 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
 762 {
 763         struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
 764         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 765         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
 766         struct aead_request *subreq = &rctx->subreq;
 767         struct crypto_aead *child = ctx->child;
 768         struct scatterlist *sg;
 769         u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
 770                            crypto_aead_alignmask(child) + 1);
 771
 772         scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
 773
 774         memcpy(iv, ctx->nonce, 4);
 775         memcpy(iv + 4, req->iv, 8);
 776
 777         sg_init_table(rctx->src, 3);
 778         sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
 779         sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
 780         if (sg != rctx->src + 1)
 781                 sg_chain(rctx->src, 2, sg);
 782
 783         if (req->src != req->dst) {
 784                 sg_init_table(rctx->dst, 3);
 785                 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
 786                 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
 787                 if (sg != rctx->dst + 1)
 788                         sg_chain(rctx->dst, 2, sg);
 789         }
 790
 791         aead_request_set_tfm(subreq, child);
 792         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
 793                                   req->base.data);
 794         aead_request_set_crypt(subreq, rctx->src,
 795                                req->src == req->dst ? rctx->src : rctx->dst,
 796                                req->cryptlen, iv);
 797         aead_request_set_ad(subreq, req->assoclen - 8);
 798
 799         return subreq;
 800 }
 801
 802 static int crypto_rfc4106_encrypt(struct aead_request *req)
 803 {
 804         int err;
 805
 806         err = crypto_ipsec_check_assoclen(req->assoclen);
 807         if (err)
 808                 return err;
 809
 810         req = crypto_rfc4106_crypt(req);
 811
 812         return crypto_aead_encrypt(req);
 813 }
 814
 815 static int crypto_rfc4106_decrypt(struct aead_request *req)
 816 {
 817         int err;
 818
 819         err = crypto_ipsec_check_assoclen(req->assoclen);
 820         if (err)
 821                 return err;
 822
 823         req = crypto_rfc4106_crypt(req);
 824
 825         return crypto_aead_decrypt(req);
 826 }
 827
 828 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
 829 {
 830         struct aead_instance *inst = aead_alg_instance(tfm);
 831         struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
 832         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 833         struct crypto_aead *aead;
 834         unsigned long align;
 835
 836         aead = crypto_spawn_aead(spawn);
 837         if (IS_ERR(aead))
 838                 return PTR_ERR(aead);
 839
 840         ctx->child = aead;
 841
 842         align = crypto_aead_alignmask(aead);
 843         align &= ~(crypto_tfm_ctx_alignment() - 1);
 844         crypto_aead_set_reqsize(
 845                 tfm,
 846                 sizeof(struct crypto_rfc4106_req_ctx) +
 847                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
 848                 align + 24);
 849
 850         return 0;
 851 }
 852
 853 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
 854 {
 855         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 856
 857         crypto_free_aead(ctx->child);
 858 }
 859
 860 static void crypto_rfc4106_free(struct aead_instance *inst)
 861 {
 862         crypto_drop_aead(aead_instance_ctx(inst));
 863         kfree(inst);
 864 }
 865
 866 static int crypto_rfc4106_create(struct crypto_template *tmpl,
 867                                  struct rtattr **tb)
 868 {
 869         struct crypto_attr_type *algt;
 870         struct aead_instance *inst;
 871         struct crypto_aead_spawn *spawn;
 872         struct aead_alg *alg;
 873         const char *ccm_name;
 874         int err;
 875
 876         algt = crypto_get_attr_type(tb);
 877         if (IS_ERR(algt))
 878                 return PTR_ERR(algt);
 879
 880         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 881                 return -EINVAL;
 882
 883         ccm_name = crypto_attr_alg_name(tb[1]);
 884         if (IS_ERR(ccm_name))
 885                 return PTR_ERR(ccm_name);
 886
 887         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 888         if (!inst)
 889                 return -ENOMEM;
 890
 891         spawn = aead_instance_ctx(inst);
 892         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
 893         err = crypto_grab_aead(spawn, ccm_name, 0,
 894                                crypto_requires_sync(algt->type, algt->mask));
 895         if (err)
 896                 goto out_free_inst;
 897
 898         alg = crypto_spawn_aead_alg(spawn);
 899
 900         err = -EINVAL;
 901
 902         /* Underlying IV size must be 12. */
 903         if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
 904                 goto out_drop_alg;
 905
 906         /* Not a stream cipher? */
 907         if (alg->base.cra_blocksize != 1)
 908                 goto out_drop_alg;
 909
 910         err = -ENAMETOOLONG;
 911         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 912                      "rfc4106(%s)", alg->base.cra_name) >=
 913             CRYPTO_MAX_ALG_NAME ||
 914             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 915                      "rfc4106(%s)", alg->base.cra_driver_name) >=
 916             CRYPTO_MAX_ALG_NAME)
 917                 goto out_drop_alg;
 918
 919         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
 920         inst->alg.base.cra_priority = alg->base.cra_priority;
 921         inst->alg.base.cra_blocksize = 1;
 922         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
 923
 924         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
 925
 926         inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
 927         inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
 928         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 929
 930         inst->alg.init = crypto_rfc4106_init_tfm;
 931         inst->alg.exit = crypto_rfc4106_exit_tfm;
 932
 933         inst->alg.setkey = crypto_rfc4106_setkey;
 934         inst->alg.setauthsize = crypto_rfc4106_setauthsize;
 935         inst->alg.encrypt = crypto_rfc4106_encrypt;
 936         inst->alg.decrypt = crypto_rfc4106_decrypt;
 937
 938         inst->free = crypto_rfc4106_free;
 939
 940         err = aead_register_instance(tmpl, inst);
 941         if (err)
 942                 goto out_drop_alg;
 943
 944 out:
 945         return err;
 946
 947 out_drop_alg:
 948         crypto_drop_aead(spawn);
 949 out_free_inst:
 950         kfree(inst);
 951         goto out;
 952 }
 953
 954 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
 955                                  unsigned int keylen)
 956 {
 957         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
 958         struct crypto_aead *child = ctx->child;
 959         int err;
 960
 961         if (keylen < 4)
 962                 return -EINVAL;
 963
 964         keylen -= 4;
 965         memcpy(ctx->nonce, key + keylen, 4);
 966
 967         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 968         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 969                                      CRYPTO_TFM_REQ_MASK);
 970         err = crypto_aead_setkey(child, key, keylen);
 971         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 972                                       CRYPTO_TFM_RES_MASK);
 973
 974         return err;
 975 }
 976
 977 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
 978                                       unsigned int authsize)
 979 {
 980         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
 981
 982         if (authsize != 16)
 983                 return -EINVAL;
 984
 985         return crypto_aead_setauthsize(ctx->child, authsize);
 986 }
 987
 988 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
 989 {
 990         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 991         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
 992         struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
 993         struct aead_request *subreq = &rctx->subreq;
 994         unsigned int authsize = crypto_aead_authsize(aead);
 995         u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
 996                            crypto_aead_alignmask(ctx->child) + 1);
 997         int err;
 998
 999         if (req->src != req->dst) {
1000                 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1001                 if (err)
1002                         return err;
1003         }
1004
1005         memcpy(iv, ctx->nonce, 4);
1006         memcpy(iv + 4, req->iv, 8);
1007
1008         aead_request_set_tfm(subreq, ctx->child);
1009         aead_request_set_callback(subreq, req->base.flags,
1010                                   req->base.complete, req->base.data);
1011         aead_request_set_crypt(subreq, req->src, req->dst,
1012                                enc ? 0 : authsize, iv);
1013         aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1014                                     subreq->cryptlen);
1015
1016         return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1017 }
1018
1019 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1020 {
1021         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1022         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1023         unsigned int authsize = crypto_aead_authsize(aead);
1024         unsigned int nbytes = req->assoclen + req->cryptlen -
1025                               (enc ? 0 : authsize);
1026         SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1027
1028         skcipher_request_set_sync_tfm(nreq, ctx->null);
1029         skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1030         skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1031
1032         return crypto_skcipher_encrypt(nreq);
1033 }
1034
1035 static int crypto_rfc4543_encrypt(struct aead_request *req)
1036 {
1037         return crypto_ipsec_check_assoclen(req->assoclen) ?:
1038                crypto_rfc4543_crypt(req, true);
1039 }
1040
1041 static int crypto_rfc4543_decrypt(struct aead_request *req)
1042 {
1043         return crypto_ipsec_check_assoclen(req->assoclen) ?:
1044                crypto_rfc4543_crypt(req, false);
1045 }
1046
1047 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1048 {
1049         struct aead_instance *inst = aead_alg_instance(tfm);
1050         struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1051         struct crypto_aead_spawn *spawn = &ictx->aead;
1052         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1053         struct crypto_aead *aead;
1054         struct crypto_sync_skcipher *null;
1055         unsigned long align;
1056         int err = 0;
1057
1058         aead = crypto_spawn_aead(spawn);
1059         if (IS_ERR(aead))
1060                 return PTR_ERR(aead);
1061
1062         null = crypto_get_default_null_skcipher();
1063         err = PTR_ERR(null);
1064         if (IS_ERR(null))
1065                 goto err_free_aead;
1066
1067         ctx->child = aead;
1068         ctx->null = null;
1069
1070         align = crypto_aead_alignmask(aead);
1071         align &= ~(crypto_tfm_ctx_alignment() - 1);
1072         crypto_aead_set_reqsize(
1073                 tfm,
1074                 sizeof(struct crypto_rfc4543_req_ctx) +
1075                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1076                 align + GCM_AES_IV_SIZE);
1077
1078         return 0;
1079
1080 err_free_aead:
1081         crypto_free_aead(aead);
1082         return err;
1083 }
1084
1085 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1086 {
1087         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1088
1089         crypto_free_aead(ctx->child);
1090         crypto_put_default_null_skcipher();
1091 }
1092
1093 static void crypto_rfc4543_free(struct aead_instance *inst)
1094 {
1095         struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1096
1097         crypto_drop_aead(&ctx->aead);
1098
1099         kfree(inst);
1100 }
1101
1102 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1103                                 struct rtattr **tb)
1104 {
1105         struct crypto_attr_type *algt;
1106         struct aead_instance *inst;
1107         struct crypto_aead_spawn *spawn;
1108         struct aead_alg *alg;
1109         struct crypto_rfc4543_instance_ctx *ctx;
1110         const char *ccm_name;
1111         int err;
1112
1113         algt = crypto_get_attr_type(tb);
1114         if (IS_ERR(algt))
1115                 return PTR_ERR(algt);
1116
1117         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1118                 return -EINVAL;
1119
1120         ccm_name = crypto_attr_alg_name(tb[1]);
1121         if (IS_ERR(ccm_name))
1122                 return PTR_ERR(ccm_name);
1123
1124         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1125         if (!inst)
1126                 return -ENOMEM;
1127
1128         ctx = aead_instance_ctx(inst);
1129         spawn = &ctx->aead;
1130         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1131         err = crypto_grab_aead(spawn, ccm_name, 0,
1132                                crypto_requires_sync(algt->type, algt->mask));
1133         if (err)
1134                 goto out_free_inst;
1135
1136         alg = crypto_spawn_aead_alg(spawn);
1137
1138         err = -EINVAL;
1139
1140         /* Underlying IV size must be 12. */
1141         if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1142                 goto out_drop_alg;
1143
1144         /* Not a stream cipher? */
1145         if (alg->base.cra_blocksize != 1)
1146                 goto out_drop_alg;
1147
1148         err = -ENAMETOOLONG;
1149         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1150                      "rfc4543(%s)", alg->base.cra_name) >=
1151             CRYPTO_MAX_ALG_NAME ||
1152             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1153                      "rfc4543(%s)", alg->base.cra_driver_name) >=
1154             CRYPTO_MAX_ALG_NAME)
1155                 goto out_drop_alg;
1156
1157         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1158         inst->alg.base.cra_priority = alg->base.cra_priority;
1159         inst->alg.base.cra_blocksize = 1;
1160         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1161
1162         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1163
1164         inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1165         inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1166         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1167
1168         inst->alg.init = crypto_rfc4543_init_tfm;
1169         inst->alg.exit = crypto_rfc4543_exit_tfm;
1170
1171         inst->alg.setkey = crypto_rfc4543_setkey;
1172         inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1173         inst->alg.encrypt = crypto_rfc4543_encrypt;
1174         inst->alg.decrypt = crypto_rfc4543_decrypt;
1175
1176         inst->free = crypto_rfc4543_free,
1177
1178         err = aead_register_instance(tmpl, inst);
1179         if (err)
1180                 goto out_drop_alg;
1181
1182 out:
1183         return err;
1184
1185 out_drop_alg:
1186         crypto_drop_aead(spawn);
1187 out_free_inst:
1188         kfree(inst);
1189         goto out;
1190 }
1191
1192 static struct crypto_template crypto_gcm_tmpls[] = {
1193         {
1194                 .name = "gcm_base",
1195                 .create = crypto_gcm_base_create,
1196                 .module = THIS_MODULE,
1197         }, {
1198                 .name = "gcm",
1199                 .create = crypto_gcm_create,
1200                 .module = THIS_MODULE,
1201         }, {
1202                 .name = "rfc4106",
1203                 .create = crypto_rfc4106_create,
1204                 .module = THIS_MODULE,
1205         }, {
1206                 .name = "rfc4543",
1207                 .create = crypto_rfc4543_create,
1208                 .module = THIS_MODULE,
1209         },
1210 };
1211
1212 static int __init crypto_gcm_module_init(void)
1213 {
1214         int err;
1215
1216         gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1217         if (!gcm_zeroes)
1218                 return -ENOMEM;
1219
1220         sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1221
1222         err = crypto_register_templates(crypto_gcm_tmpls,
1223                                         ARRAY_SIZE(crypto_gcm_tmpls));
1224         if (err)
1225                 kfree(gcm_zeroes);
1226
1227         return err;
1228 }
1229
1230 static void __exit crypto_gcm_module_exit(void)
1231 {
1232         kfree(gcm_zeroes);
1233         crypto_unregister_templates(crypto_gcm_tmpls,
1234                                     ARRAY_SIZE(crypto_gcm_tmpls));
1235 }
1236
1237 subsys_initcall(crypto_gcm_module_init);
1238 module_exit(crypto_gcm_module_exit);
1239
1240 MODULE_LICENSE("GPL");
1241 MODULE_DESCRIPTION("Galois/Counter Mode");
1242 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1243 MODULE_ALIAS_CRYPTO("gcm_base");
1244 MODULE_ALIAS_CRYPTO("rfc4106");
1245 MODULE_ALIAS_CRYPTO("rfc4543");
1246 MODULE_ALIAS_CRYPTO("gcm");