crypto/gcm.c

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