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/hash.h>
  18 #include "internal.h"
  19 #include <linux/completion.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_ablkcipher *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_blkcipher *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 ablkcipher_request abreq;
  78         } u;
  79 };
  80
  81 struct crypto_gcm_setkey_result {
  82         int err;
  83         struct completion completion;
  84 };
  85
  86 static struct {
  87         u8 buf[16];
  88         struct scatterlist sg;
  89 } *gcm_zeroes;
  90
  91 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
  92
  93 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
  94         struct aead_request *req)
  95 {
  96         unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
  97
  98         return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
  99 }
 100
 101 static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
 102 {
 103         struct crypto_gcm_setkey_result *result = req->data;
 104
 105         if (err == -EINPROGRESS)
 106                 return;
 107
 108         result->err = err;
 109         complete(&result->completion);
 110 }
 111
 112 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
 113                              unsigned int keylen)
 114 {
 115         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 116         struct crypto_ahash *ghash = ctx->ghash;
 117         struct crypto_ablkcipher *ctr = ctx->ctr;
 118         struct {
 119                 be128 hash;
 120                 u8 iv[8];
 121
 122                 struct crypto_gcm_setkey_result result;
 123
 124                 struct scatterlist sg[1];
 125                 struct ablkcipher_request req;
 126         } *data;
 127         int err;
 128
 129         crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
 130         crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
 131                                          CRYPTO_TFM_REQ_MASK);
 132         err = crypto_ablkcipher_setkey(ctr, key, keylen);
 133         crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
 134                                     CRYPTO_TFM_RES_MASK);
 135         if (err)
 136                 return err;
 137
 138         data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
 139                        GFP_KERNEL);
 140         if (!data)
 141                 return -ENOMEM;
 142
 143         init_completion(&data->result.completion);
 144         sg_init_one(data->sg, &data->hash, sizeof(data->hash));
 145         ablkcipher_request_set_tfm(&data->req, ctr);
 146         ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
 147                                                     CRYPTO_TFM_REQ_MAY_BACKLOG,
 148                                         crypto_gcm_setkey_done,
 149                                         &data->result);
 150         ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
 151                                      sizeof(data->hash), data->iv);
 152
 153         err = crypto_ablkcipher_encrypt(&data->req);
 154         if (err == -EINPROGRESS || err == -EBUSY) {
 155                 err = wait_for_completion_interruptible(
 156                         &data->result.completion);
 157                 if (!err)
 158                         err = data->result.err;
 159         }
 160
 161         if (err)
 162                 goto out;
 163
 164         crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
 165         crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
 166                                CRYPTO_TFM_REQ_MASK);
 167         err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
 168         crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
 169                               CRYPTO_TFM_RES_MASK);
 170
 171 out:
 172         kzfree(data);
 173         return err;
 174 }
 175
 176 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
 177                                   unsigned int authsize)
 178 {
 179         switch (authsize) {
 180         case 4:
 181         case 8:
 182         case 12:
 183         case 13:
 184         case 14:
 185         case 15:
 186         case 16:
 187                 break;
 188         default:
 189                 return -EINVAL;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static void crypto_gcm_init_common(struct aead_request *req)
 196 {
 197         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 198         __be32 counter = cpu_to_be32(1);
 199         struct scatterlist *sg;
 200
 201         memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
 202         memcpy(pctx->iv, req->iv, 12);
 203         memcpy(pctx->iv + 12, &counter, 4);
 204
 205         sg_init_table(pctx->src, 3);
 206         sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
 207         sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
 208         if (sg != pctx->src + 1)
 209                 sg_chain(pctx->src, 2, sg);
 210
 211         if (req->src != req->dst) {
 212                 sg_init_table(pctx->dst, 3);
 213                 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
 214                 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
 215                 if (sg != pctx->dst + 1)
 216                         sg_chain(pctx->dst, 2, sg);
 217         }
 218 }
 219
 220 static void crypto_gcm_init_crypt(struct aead_request *req,
 221                                   unsigned int cryptlen)
 222 {
 223         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 224         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 225         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 226         struct ablkcipher_request *ablk_req = &pctx->u.abreq;
 227         struct scatterlist *dst;
 228
 229         dst = req->src == req->dst ? pctx->src : pctx->dst;
 230
 231         ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
 232         ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
 233                                      cryptlen + sizeof(pctx->auth_tag),
 234                                      pctx->iv);
 235 }
 236
 237 static inline unsigned int gcm_remain(unsigned int len)
 238 {
 239         len &= 0xfU;
 240         return len ? 16 - len : 0;
 241 }
 242
 243 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
 244
 245 static int gcm_hash_update(struct aead_request *req,
 246                            crypto_completion_t compl,
 247                            struct scatterlist *src,
 248                            unsigned int len, u32 flags)
 249 {
 250         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 251         struct ahash_request *ahreq = &pctx->u.ahreq;
 252
 253         ahash_request_set_callback(ahreq, flags, compl, req);
 254         ahash_request_set_crypt(ahreq, src, NULL, len);
 255
 256         return crypto_ahash_update(ahreq);
 257 }
 258
 259 static int gcm_hash_remain(struct aead_request *req,
 260                            unsigned int remain,
 261                            crypto_completion_t compl, u32 flags)
 262 {
 263         return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
 264 }
 265
 266 static int gcm_hash_len(struct aead_request *req, u32 flags)
 267 {
 268         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 269         struct ahash_request *ahreq = &pctx->u.ahreq;
 270         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 271         u128 lengths;
 272
 273         lengths.a = cpu_to_be64(req->assoclen * 8);
 274         lengths.b = cpu_to_be64(gctx->cryptlen * 8);
 275         memcpy(pctx->iauth_tag, &lengths, 16);
 276         sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
 277         ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
 278         ahash_request_set_crypt(ahreq, &pctx->sg,
 279                                 pctx->iauth_tag, sizeof(lengths));
 280
 281         return crypto_ahash_finup(ahreq);
 282 }
 283
 284 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
 285 {
 286         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 287         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 288
 289         return gctx->complete(req, flags);
 290 }
 291
 292 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
 293 {
 294         struct aead_request *req = areq->data;
 295
 296         if (err)
 297                 goto out;
 298
 299         err = gcm_hash_len_continue(req, 0);
 300         if (err == -EINPROGRESS)
 301                 return;
 302
 303 out:
 304         aead_request_complete(req, err);
 305 }
 306
 307 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
 308 {
 309         return gcm_hash_len(req, flags) ?:
 310                gcm_hash_len_continue(req, flags);
 311 }
 312
 313 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
 314                                        int err)
 315 {
 316         struct aead_request *req = areq->data;
 317
 318         if (err)
 319                 goto out;
 320
 321         err = gcm_hash_crypt_remain_continue(req, 0);
 322         if (err == -EINPROGRESS)
 323                 return;
 324
 325 out:
 326         aead_request_complete(req, err);
 327 }
 328
 329 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
 330 {
 331         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 332         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 333         unsigned int remain;
 334
 335         remain = gcm_remain(gctx->cryptlen);
 336         if (remain)
 337                 return gcm_hash_remain(req, remain,
 338                                        gcm_hash_crypt_remain_done, flags) ?:
 339                        gcm_hash_crypt_remain_continue(req, flags);
 340
 341         return gcm_hash_crypt_remain_continue(req, flags);
 342 }
 343
 344 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
 345 {
 346         struct aead_request *req = areq->data;
 347
 348         if (err)
 349                 goto out;
 350
 351         err = gcm_hash_crypt_continue(req, 0);
 352         if (err == -EINPROGRESS)
 353                 return;
 354
 355 out:
 356         aead_request_complete(req, err);
 357 }
 358
 359 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
 360 {
 361         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 362         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 363
 364         if (gctx->cryptlen)
 365                 return gcm_hash_update(req, gcm_hash_crypt_done,
 366                                        gctx->src, gctx->cryptlen, flags) ?:
 367                        gcm_hash_crypt_continue(req, flags);
 368
 369         return gcm_hash_crypt_remain_continue(req, flags);
 370 }
 371
 372 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
 373                                        int err)
 374 {
 375         struct aead_request *req = areq->data;
 376
 377         if (err)
 378                 goto out;
 379
 380         err = gcm_hash_assoc_remain_continue(req, 0);
 381         if (err == -EINPROGRESS)
 382                 return;
 383
 384 out:
 385         aead_request_complete(req, err);
 386 }
 387
 388 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
 389 {
 390         unsigned int remain;
 391
 392         remain = gcm_remain(req->assoclen);
 393         if (remain)
 394                 return gcm_hash_remain(req, remain,
 395                                        gcm_hash_assoc_remain_done, flags) ?:
 396                        gcm_hash_assoc_remain_continue(req, flags);
 397
 398         return gcm_hash_assoc_remain_continue(req, flags);
 399 }
 400
 401 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
 402 {
 403         struct aead_request *req = areq->data;
 404
 405         if (err)
 406                 goto out;
 407
 408         err = gcm_hash_assoc_continue(req, 0);
 409         if (err == -EINPROGRESS)
 410                 return;
 411
 412 out:
 413         aead_request_complete(req, err);
 414 }
 415
 416 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
 417 {
 418         if (req->assoclen)
 419                 return gcm_hash_update(req, gcm_hash_assoc_done,
 420                                        req->src, req->assoclen, flags) ?:
 421                        gcm_hash_assoc_continue(req, flags);
 422
 423         return gcm_hash_assoc_remain_continue(req, flags);
 424 }
 425
 426 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
 427 {
 428         struct aead_request *req = areq->data;
 429
 430         if (err)
 431                 goto out;
 432
 433         err = gcm_hash_init_continue(req, 0);
 434         if (err == -EINPROGRESS)
 435                 return;
 436
 437 out:
 438         aead_request_complete(req, err);
 439 }
 440
 441 static int gcm_hash(struct aead_request *req, u32 flags)
 442 {
 443         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 444         struct ahash_request *ahreq = &pctx->u.ahreq;
 445         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
 446
 447         ahash_request_set_tfm(ahreq, ctx->ghash);
 448
 449         ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
 450         return crypto_ahash_init(ahreq) ?:
 451                gcm_hash_init_continue(req, flags);
 452 }
 453
 454 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
 455 {
 456         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 457         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 458         u8 *auth_tag = pctx->auth_tag;
 459
 460         crypto_xor(auth_tag, pctx->iauth_tag, 16);
 461         scatterwalk_map_and_copy(auth_tag, req->dst,
 462                                  req->assoclen + req->cryptlen,
 463                                  crypto_aead_authsize(aead), 1);
 464         return 0;
 465 }
 466
 467 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
 468 {
 469         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 470         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 471
 472         gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
 473         gctx->cryptlen = req->cryptlen;
 474         gctx->complete = gcm_enc_copy_hash;
 475
 476         return gcm_hash(req, flags);
 477 }
 478
 479 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
 480 {
 481         struct aead_request *req = areq->data;
 482
 483         if (err)
 484                 goto out;
 485
 486         err = gcm_encrypt_continue(req, 0);
 487         if (err == -EINPROGRESS)
 488                 return;
 489
 490 out:
 491         aead_request_complete(req, err);
 492 }
 493
 494 static int crypto_gcm_encrypt(struct aead_request *req)
 495 {
 496         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 497         struct ablkcipher_request *abreq = &pctx->u.abreq;
 498         u32 flags = aead_request_flags(req);
 499
 500         crypto_gcm_init_common(req);
 501         crypto_gcm_init_crypt(req, req->cryptlen);
 502         ablkcipher_request_set_callback(abreq, flags, gcm_encrypt_done, req);
 503
 504         return crypto_ablkcipher_encrypt(abreq) ?:
 505                gcm_encrypt_continue(req, flags);
 506 }
 507
 508 static int crypto_gcm_verify(struct aead_request *req)
 509 {
 510         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 511         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 512         u8 *auth_tag = pctx->auth_tag;
 513         u8 *iauth_tag = pctx->iauth_tag;
 514         unsigned int authsize = crypto_aead_authsize(aead);
 515         unsigned int cryptlen = req->cryptlen - authsize;
 516
 517         crypto_xor(auth_tag, iauth_tag, 16);
 518         scatterwalk_map_and_copy(iauth_tag, req->src,
 519                                  req->assoclen + cryptlen, authsize, 0);
 520         return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
 521 }
 522
 523 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
 524 {
 525         struct aead_request *req = areq->data;
 526
 527         if (!err)
 528                 err = crypto_gcm_verify(req);
 529
 530         aead_request_complete(req, err);
 531 }
 532
 533 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
 534 {
 535         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 536         struct ablkcipher_request *abreq = &pctx->u.abreq;
 537         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 538
 539         crypto_gcm_init_crypt(req, gctx->cryptlen);
 540         ablkcipher_request_set_callback(abreq, flags, gcm_decrypt_done, req);
 541         return crypto_ablkcipher_decrypt(abreq) ?: crypto_gcm_verify(req);
 542 }
 543
 544 static int crypto_gcm_decrypt(struct aead_request *req)
 545 {
 546         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 547         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 548         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 549         unsigned int authsize = crypto_aead_authsize(aead);
 550         unsigned int cryptlen = req->cryptlen;
 551         u32 flags = aead_request_flags(req);
 552
 553         cryptlen -= authsize;
 554
 555         crypto_gcm_init_common(req);
 556
 557         gctx->src = sg_next(pctx->src);
 558         gctx->cryptlen = cryptlen;
 559         gctx->complete = gcm_dec_hash_continue;
 560
 561         return gcm_hash(req, flags);
 562 }
 563
 564 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
 565 {
 566         struct aead_instance *inst = aead_alg_instance(tfm);
 567         struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
 568         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
 569         struct crypto_ablkcipher *ctr;
 570         struct crypto_ahash *ghash;
 571         unsigned long align;
 572         int err;
 573
 574         ghash = crypto_spawn_ahash(&ictx->ghash);
 575         if (IS_ERR(ghash))
 576                 return PTR_ERR(ghash);
 577
 578         ctr = crypto_spawn_skcipher(&ictx->ctr);
 579         err = PTR_ERR(ctr);
 580         if (IS_ERR(ctr))
 581                 goto err_free_hash;
 582
 583         ctx->ctr = ctr;
 584         ctx->ghash = ghash;
 585
 586         align = crypto_aead_alignmask(tfm);
 587         align &= ~(crypto_tfm_ctx_alignment() - 1);
 588         crypto_aead_set_reqsize(tfm,
 589                 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
 590                 max(sizeof(struct ablkcipher_request) +
 591                     crypto_ablkcipher_reqsize(ctr),
 592                     sizeof(struct ahash_request) +
 593                     crypto_ahash_reqsize(ghash)));
 594
 595         return 0;
 596
 597 err_free_hash:
 598         crypto_free_ahash(ghash);
 599         return err;
 600 }
 601
 602 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
 603 {
 604         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
 605
 606         crypto_free_ahash(ctx->ghash);
 607         crypto_free_ablkcipher(ctx->ctr);
 608 }
 609
 610 static void crypto_gcm_free(struct aead_instance *inst)
 611 {
 612         struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
 613
 614         crypto_drop_skcipher(&ctx->ctr);
 615         crypto_drop_ahash(&ctx->ghash);
 616         kfree(inst);
 617 }
 618
 619 static int crypto_gcm_create_common(struct crypto_template *tmpl,
 620                                     struct rtattr **tb,
 621                                     const char *full_name,
 622                                     const char *ctr_name,
 623                                     const char *ghash_name)
 624 {
 625         struct crypto_attr_type *algt;
 626         struct aead_instance *inst;
 627         struct crypto_alg *ctr;
 628         struct crypto_alg *ghash_alg;
 629         struct hash_alg_common *ghash;
 630         struct gcm_instance_ctx *ctx;
 631         int err;
 632
 633         algt = crypto_get_attr_type(tb);
 634         if (IS_ERR(algt))
 635                 return PTR_ERR(algt);
 636
 637         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 638                 return -EINVAL;
 639
 640         ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
 641                                     CRYPTO_ALG_TYPE_HASH,
 642                                     CRYPTO_ALG_TYPE_AHASH_MASK);
 643         if (IS_ERR(ghash_alg))
 644                 return PTR_ERR(ghash_alg);
 645
 646         ghash = __crypto_hash_alg_common(ghash_alg);
 647
 648         err = -ENOMEM;
 649         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 650         if (!inst)
 651                 goto out_put_ghash;
 652
 653         ctx = aead_instance_ctx(inst);
 654         err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
 655                                       aead_crypto_instance(inst));
 656         if (err)
 657                 goto err_free_inst;
 658
 659         err = -EINVAL;
 660         if (ghash->digestsize != 16)
 661                 goto err_drop_ghash;
 662
 663         crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
 664         err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
 665                                    crypto_requires_sync(algt->type,
 666                                                         algt->mask));
 667         if (err)
 668                 goto err_drop_ghash;
 669
 670         ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
 671
 672         /* We only support 16-byte blocks. */
 673         if (ctr->cra_ablkcipher.ivsize != 16)
 674                 goto out_put_ctr;
 675
 676         /* Not a stream cipher? */
 677         err = -EINVAL;
 678         if (ctr->cra_blocksize != 1)
 679                 goto out_put_ctr;
 680
 681         err = -ENAMETOOLONG;
 682         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 683                      "gcm_base(%s,%s)", ctr->cra_driver_name,
 684                      ghash_alg->cra_driver_name) >=
 685             CRYPTO_MAX_ALG_NAME)
 686                 goto out_put_ctr;
 687
 688         memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
 689
 690         inst->alg.base.cra_flags = (ghash->base.cra_flags | ctr->cra_flags) &
 691                                    CRYPTO_ALG_ASYNC;
 692         inst->alg.base.cra_priority = (ghash->base.cra_priority +
 693                                        ctr->cra_priority) / 2;
 694         inst->alg.base.cra_blocksize = 1;
 695         inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
 696                                        ctr->cra_alignmask;
 697         inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
 698         inst->alg.ivsize = 12;
 699         inst->alg.maxauthsize = 16;
 700         inst->alg.init = crypto_gcm_init_tfm;
 701         inst->alg.exit = crypto_gcm_exit_tfm;
 702         inst->alg.setkey = crypto_gcm_setkey;
 703         inst->alg.setauthsize = crypto_gcm_setauthsize;
 704         inst->alg.encrypt = crypto_gcm_encrypt;
 705         inst->alg.decrypt = crypto_gcm_decrypt;
 706
 707         inst->free = crypto_gcm_free;
 708
 709         err = aead_register_instance(tmpl, inst);
 710         if (err)
 711                 goto out_put_ctr;
 712
 713 out_put_ghash:
 714         crypto_mod_put(ghash_alg);
 715         return err;
 716
 717 out_put_ctr:
 718         crypto_drop_skcipher(&ctx->ctr);
 719 err_drop_ghash:
 720         crypto_drop_ahash(&ctx->ghash);
 721 err_free_inst:
 722         kfree(inst);
 723         goto out_put_ghash;
 724 }
 725
 726 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
 727 {
 728         const char *cipher_name;
 729         char ctr_name[CRYPTO_MAX_ALG_NAME];
 730         char full_name[CRYPTO_MAX_ALG_NAME];
 731
 732         cipher_name = crypto_attr_alg_name(tb[1]);
 733         if (IS_ERR(cipher_name))
 734                 return PTR_ERR(cipher_name);
 735
 736         if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
 737             CRYPTO_MAX_ALG_NAME)
 738                 return -ENAMETOOLONG;
 739
 740         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
 741             CRYPTO_MAX_ALG_NAME)
 742                 return -ENAMETOOLONG;
 743
 744         return crypto_gcm_create_common(tmpl, tb, full_name,
 745                                         ctr_name, "ghash");
 746 }
 747
 748 static struct crypto_template crypto_gcm_tmpl = {
 749         .name = "gcm",
 750         .create = crypto_gcm_create,
 751         .module = THIS_MODULE,
 752 };
 753
 754 static int crypto_gcm_base_create(struct crypto_template *tmpl,
 755                                   struct rtattr **tb)
 756 {
 757         const char *ctr_name;
 758         const char *ghash_name;
 759         char full_name[CRYPTO_MAX_ALG_NAME];
 760
 761         ctr_name = crypto_attr_alg_name(tb[1]);
 762         if (IS_ERR(ctr_name))
 763                 return PTR_ERR(ctr_name);
 764
 765         ghash_name = crypto_attr_alg_name(tb[2]);
 766         if (IS_ERR(ghash_name))
 767                 return PTR_ERR(ghash_name);
 768
 769         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
 770                      ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
 771                 return -ENAMETOOLONG;
 772
 773         return crypto_gcm_create_common(tmpl, tb, full_name,
 774                                         ctr_name, ghash_name);
 775 }
 776
 777 static struct crypto_template crypto_gcm_base_tmpl = {
 778         .name = "gcm_base",
 779         .create = crypto_gcm_base_create,
 780         .module = THIS_MODULE,
 781 };
 782
 783 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
 784                                  unsigned int keylen)
 785 {
 786         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 787         struct crypto_aead *child = ctx->child;
 788         int err;
 789
 790         if (keylen < 4)
 791                 return -EINVAL;
 792
 793         keylen -= 4;
 794         memcpy(ctx->nonce, key + keylen, 4);
 795
 796         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 797         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 798                                      CRYPTO_TFM_REQ_MASK);
 799         err = crypto_aead_setkey(child, key, keylen);
 800         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 801                                       CRYPTO_TFM_RES_MASK);
 802
 803         return err;
 804 }
 805
 806 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
 807                                       unsigned int authsize)
 808 {
 809         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 810
 811         switch (authsize) {
 812         case 8:
 813         case 12:
 814         case 16:
 815                 break;
 816         default:
 817                 return -EINVAL;
 818         }
 819
 820         return crypto_aead_setauthsize(ctx->child, authsize);
 821 }
 822
 823 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
 824 {
 825         struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
 826         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 827         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
 828         struct aead_request *subreq = &rctx->subreq;
 829         struct crypto_aead *child = ctx->child;
 830         struct scatterlist *sg;
 831         u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
 832                            crypto_aead_alignmask(child) + 1);
 833
 834         scatterwalk_map_and_copy(iv + 12, req->src, 0, req->assoclen - 8, 0);
 835
 836         memcpy(iv, ctx->nonce, 4);
 837         memcpy(iv + 4, req->iv, 8);
 838
 839         sg_init_table(rctx->src, 3);
 840         sg_set_buf(rctx->src, iv + 12, req->assoclen - 8);
 841         sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
 842         if (sg != rctx->src + 1)
 843                 sg_chain(rctx->src, 2, sg);
 844
 845         if (req->src != req->dst) {
 846                 sg_init_table(rctx->dst, 3);
 847                 sg_set_buf(rctx->dst, iv + 12, req->assoclen - 8);
 848                 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
 849                 if (sg != rctx->dst + 1)
 850                         sg_chain(rctx->dst, 2, sg);
 851         }
 852
 853         aead_request_set_tfm(subreq, child);
 854         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
 855                                   req->base.data);
 856         aead_request_set_crypt(subreq, rctx->src,
 857                                req->src == req->dst ? rctx->src : rctx->dst,
 858                                req->cryptlen, iv);
 859         aead_request_set_ad(subreq, req->assoclen - 8);
 860
 861         return subreq;
 862 }
 863
 864 static int crypto_rfc4106_encrypt(struct aead_request *req)
 865 {
 866         if (req->assoclen != 16 && req->assoclen != 20)
 867                 return -EINVAL;
 868
 869         req = crypto_rfc4106_crypt(req);
 870
 871         return crypto_aead_encrypt(req);
 872 }
 873
 874 static int crypto_rfc4106_decrypt(struct aead_request *req)
 875 {
 876         if (req->assoclen != 16 && req->assoclen != 20)
 877                 return -EINVAL;
 878
 879         req = crypto_rfc4106_crypt(req);
 880
 881         return crypto_aead_decrypt(req);
 882 }
 883
 884 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
 885 {
 886         struct aead_instance *inst = aead_alg_instance(tfm);
 887         struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
 888         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 889         struct crypto_aead *aead;
 890         unsigned long align;
 891
 892         aead = crypto_spawn_aead(spawn);
 893         if (IS_ERR(aead))
 894                 return PTR_ERR(aead);
 895
 896         ctx->child = aead;
 897
 898         align = crypto_aead_alignmask(aead);
 899         align &= ~(crypto_tfm_ctx_alignment() - 1);
 900         crypto_aead_set_reqsize(
 901                 tfm,
 902                 sizeof(struct crypto_rfc4106_req_ctx) +
 903                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
 904                 align + 24);
 905
 906         return 0;
 907 }
 908
 909 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
 910 {
 911         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 912
 913         crypto_free_aead(ctx->child);
 914 }
 915
 916 static void crypto_rfc4106_free(struct aead_instance *inst)
 917 {
 918         crypto_drop_aead(aead_instance_ctx(inst));
 919         kfree(inst);
 920 }
 921
 922 static int crypto_rfc4106_create(struct crypto_template *tmpl,
 923                                  struct rtattr **tb)
 924 {
 925         struct crypto_attr_type *algt;
 926         struct aead_instance *inst;
 927         struct crypto_aead_spawn *spawn;
 928         struct aead_alg *alg;
 929         const char *ccm_name;
 930         int err;
 931
 932         algt = crypto_get_attr_type(tb);
 933         if (IS_ERR(algt))
 934                 return PTR_ERR(algt);
 935
 936         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 937                 return -EINVAL;
 938
 939         ccm_name = crypto_attr_alg_name(tb[1]);
 940         if (IS_ERR(ccm_name))
 941                 return PTR_ERR(ccm_name);
 942
 943         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 944         if (!inst)
 945                 return -ENOMEM;
 946
 947         spawn = aead_instance_ctx(inst);
 948         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
 949         err = crypto_grab_aead(spawn, ccm_name, 0,
 950                                crypto_requires_sync(algt->type, algt->mask));
 951         if (err)
 952                 goto out_free_inst;
 953
 954         alg = crypto_spawn_aead_alg(spawn);
 955
 956         err = -EINVAL;
 957
 958         /* Underlying IV size must be 12. */
 959         if (crypto_aead_alg_ivsize(alg) != 12)
 960                 goto out_drop_alg;
 961
 962         /* Not a stream cipher? */
 963         if (alg->base.cra_blocksize != 1)
 964                 goto out_drop_alg;
 965
 966         err = -ENAMETOOLONG;
 967         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 968                      "rfc4106(%s)", alg->base.cra_name) >=
 969             CRYPTO_MAX_ALG_NAME ||
 970             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 971                      "rfc4106(%s)", alg->base.cra_driver_name) >=
 972             CRYPTO_MAX_ALG_NAME)
 973                 goto out_drop_alg;
 974
 975         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
 976         inst->alg.base.cra_priority = alg->base.cra_priority;
 977         inst->alg.base.cra_blocksize = 1;
 978         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
 979
 980         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
 981
 982         inst->alg.ivsize = 8;
 983         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 984
 985         inst->alg.init = crypto_rfc4106_init_tfm;
 986         inst->alg.exit = crypto_rfc4106_exit_tfm;
 987
 988         inst->alg.setkey = crypto_rfc4106_setkey;
 989         inst->alg.setauthsize = crypto_rfc4106_setauthsize;
 990         inst->alg.encrypt = crypto_rfc4106_encrypt;
 991         inst->alg.decrypt = crypto_rfc4106_decrypt;
 992
 993         inst->free = crypto_rfc4106_free;
 994
 995         err = aead_register_instance(tmpl, inst);
 996         if (err)
 997                 goto out_drop_alg;
 998
 999 out:
1000         return err;
1001
1002 out_drop_alg:
1003         crypto_drop_aead(spawn);
1004 out_free_inst:
1005         kfree(inst);
1006         goto out;
1007 }
1008
1009 static struct crypto_template crypto_rfc4106_tmpl = {
1010         .name = "rfc4106",
1011         .create = crypto_rfc4106_create,
1012         .module = THIS_MODULE,
1013 };
1014
1015 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1016                                  unsigned int keylen)
1017 {
1018         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1019         struct crypto_aead *child = ctx->child;
1020         int err;
1021
1022         if (keylen < 4)
1023                 return -EINVAL;
1024
1025         keylen -= 4;
1026         memcpy(ctx->nonce, key + keylen, 4);
1027
1028         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1029         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1030                                      CRYPTO_TFM_REQ_MASK);
1031         err = crypto_aead_setkey(child, key, keylen);
1032         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1033                                       CRYPTO_TFM_RES_MASK);
1034
1035         return err;
1036 }
1037
1038 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1039                                       unsigned int authsize)
1040 {
1041         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1042
1043         if (authsize != 16)
1044                 return -EINVAL;
1045
1046         return crypto_aead_setauthsize(ctx->child, authsize);
1047 }
1048
1049 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1050 {
1051         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1052         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1053         struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1054         struct aead_request *subreq = &rctx->subreq;
1055         unsigned int authsize = crypto_aead_authsize(aead);
1056         u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1057                            crypto_aead_alignmask(ctx->child) + 1);
1058         int err;
1059
1060         if (req->src != req->dst) {
1061                 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1062                 if (err)
1063                         return err;
1064         }
1065
1066         memcpy(iv, ctx->nonce, 4);
1067         memcpy(iv + 4, req->iv, 8);
1068
1069         aead_request_set_tfm(subreq, ctx->child);
1070         aead_request_set_callback(subreq, req->base.flags,
1071                                   req->base.complete, req->base.data);
1072         aead_request_set_crypt(subreq, req->src, req->dst,
1073                                enc ? 0 : authsize, iv);
1074         aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1075                                     subreq->cryptlen);
1076
1077         return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1078 }
1079
1080 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1081 {
1082         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1083         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1084         unsigned int authsize = crypto_aead_authsize(aead);
1085         unsigned int nbytes = req->assoclen + req->cryptlen -
1086                               (enc ? 0 : authsize);
1087         struct blkcipher_desc desc = {
1088                 .tfm = ctx->null,
1089         };
1090
1091         return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1092 }
1093
1094 static int crypto_rfc4543_encrypt(struct aead_request *req)
1095 {
1096         return crypto_rfc4543_crypt(req, true);
1097 }
1098
1099 static int crypto_rfc4543_decrypt(struct aead_request *req)
1100 {
1101         return crypto_rfc4543_crypt(req, false);
1102 }
1103
1104 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1105 {
1106         struct aead_instance *inst = aead_alg_instance(tfm);
1107         struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1108         struct crypto_aead_spawn *spawn = &ictx->aead;
1109         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1110         struct crypto_aead *aead;
1111         struct crypto_blkcipher *null;
1112         unsigned long align;
1113         int err = 0;
1114
1115         aead = crypto_spawn_aead(spawn);
1116         if (IS_ERR(aead))
1117                 return PTR_ERR(aead);
1118
1119         null = crypto_get_default_null_skcipher();
1120         err = PTR_ERR(null);
1121         if (IS_ERR(null))
1122                 goto err_free_aead;
1123
1124         ctx->child = aead;
1125         ctx->null = null;
1126
1127         align = crypto_aead_alignmask(aead);
1128         align &= ~(crypto_tfm_ctx_alignment() - 1);
1129         crypto_aead_set_reqsize(
1130                 tfm,
1131                 sizeof(struct crypto_rfc4543_req_ctx) +
1132                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1133                 align + 12);
1134
1135         return 0;
1136
1137 err_free_aead:
1138         crypto_free_aead(aead);
1139         return err;
1140 }
1141
1142 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1143 {
1144         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1145
1146         crypto_free_aead(ctx->child);
1147         crypto_put_default_null_skcipher();
1148 }
1149
1150 static void crypto_rfc4543_free(struct aead_instance *inst)
1151 {
1152         struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1153
1154         crypto_drop_aead(&ctx->aead);
1155
1156         kfree(inst);
1157 }
1158
1159 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1160                                 struct rtattr **tb)
1161 {
1162         struct crypto_attr_type *algt;
1163         struct aead_instance *inst;
1164         struct crypto_aead_spawn *spawn;
1165         struct aead_alg *alg;
1166         struct crypto_rfc4543_instance_ctx *ctx;
1167         const char *ccm_name;
1168         int err;
1169
1170         algt = crypto_get_attr_type(tb);
1171         if (IS_ERR(algt))
1172                 return PTR_ERR(algt);
1173
1174         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1175                 return -EINVAL;
1176
1177         ccm_name = crypto_attr_alg_name(tb[1]);
1178         if (IS_ERR(ccm_name))
1179                 return PTR_ERR(ccm_name);
1180
1181         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1182         if (!inst)
1183                 return -ENOMEM;
1184
1185         ctx = aead_instance_ctx(inst);
1186         spawn = &ctx->aead;
1187         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1188         err = crypto_grab_aead(spawn, ccm_name, 0,
1189                                crypto_requires_sync(algt->type, algt->mask));
1190         if (err)
1191                 goto out_free_inst;
1192
1193         alg = crypto_spawn_aead_alg(spawn);
1194
1195         err = -EINVAL;
1196
1197         /* Underlying IV size must be 12. */
1198         if (crypto_aead_alg_ivsize(alg) != 12)
1199                 goto out_drop_alg;
1200
1201         /* Not a stream cipher? */
1202         if (alg->base.cra_blocksize != 1)
1203                 goto out_drop_alg;
1204
1205         err = -ENAMETOOLONG;
1206         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1207                      "rfc4543(%s)", alg->base.cra_name) >=
1208             CRYPTO_MAX_ALG_NAME ||
1209             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1210                      "rfc4543(%s)", alg->base.cra_driver_name) >=
1211             CRYPTO_MAX_ALG_NAME)
1212                 goto out_drop_alg;
1213
1214         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1215         inst->alg.base.cra_priority = alg->base.cra_priority;
1216         inst->alg.base.cra_blocksize = 1;
1217         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1218
1219         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1220
1221         inst->alg.ivsize = 8;
1222         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1223
1224         inst->alg.init = crypto_rfc4543_init_tfm;
1225         inst->alg.exit = crypto_rfc4543_exit_tfm;
1226
1227         inst->alg.setkey = crypto_rfc4543_setkey;
1228         inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1229         inst->alg.encrypt = crypto_rfc4543_encrypt;
1230         inst->alg.decrypt = crypto_rfc4543_decrypt;
1231
1232         inst->free = crypto_rfc4543_free,
1233
1234         err = aead_register_instance(tmpl, inst);
1235         if (err)
1236                 goto out_drop_alg;
1237
1238 out:
1239         return err;
1240
1241 out_drop_alg:
1242         crypto_drop_aead(spawn);
1243 out_free_inst:
1244         kfree(inst);
1245         goto out;
1246 }
1247
1248 static struct crypto_template crypto_rfc4543_tmpl = {
1249         .name = "rfc4543",
1250         .create = crypto_rfc4543_create,
1251         .module = THIS_MODULE,
1252 };
1253
1254 static int __init crypto_gcm_module_init(void)
1255 {
1256         int err;
1257
1258         gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1259         if (!gcm_zeroes)
1260                 return -ENOMEM;
1261
1262         sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1263
1264         err = crypto_register_template(&crypto_gcm_base_tmpl);
1265         if (err)
1266                 goto out;
1267
1268         err = crypto_register_template(&crypto_gcm_tmpl);
1269         if (err)
1270                 goto out_undo_base;
1271
1272         err = crypto_register_template(&crypto_rfc4106_tmpl);
1273         if (err)
1274                 goto out_undo_gcm;
1275
1276         err = crypto_register_template(&crypto_rfc4543_tmpl);
1277         if (err)
1278                 goto out_undo_rfc4106;
1279
1280         return 0;
1281
1282 out_undo_rfc4106:
1283         crypto_unregister_template(&crypto_rfc4106_tmpl);
1284 out_undo_gcm:
1285         crypto_unregister_template(&crypto_gcm_tmpl);
1286 out_undo_base:
1287         crypto_unregister_template(&crypto_gcm_base_tmpl);
1288 out:
1289         kfree(gcm_zeroes);
1290         return err;
1291 }
1292
1293 static void __exit crypto_gcm_module_exit(void)
1294 {
1295         kfree(gcm_zeroes);
1296         crypto_unregister_template(&crypto_rfc4543_tmpl);
1297         crypto_unregister_template(&crypto_rfc4106_tmpl);
1298         crypto_unregister_template(&crypto_gcm_tmpl);
1299         crypto_unregister_template(&crypto_gcm_base_tmpl);
1300 }
1301
1302 module_init(crypto_gcm_module_init);
1303 module_exit(crypto_gcm_module_exit);
1304
1305 MODULE_LICENSE("GPL");
1306 MODULE_DESCRIPTION("Galois/Counter Mode");
1307 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1308 MODULE_ALIAS_CRYPTO("gcm_base");
1309 MODULE_ALIAS_CRYPTO("rfc4106");
1310 MODULE_ALIAS_CRYPTO("rfc4543");
1311 MODULE_ALIAS_CRYPTO("gcm");