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_skcipher *ctr;
  33         struct crypto_ahash *ghash;
  34 };
  35
  36 struct crypto_rfc4106_ctx {
  37         struct crypto_aead *child;
  38         u8 nonce[4];
  39 };
  40
  41 struct crypto_rfc4106_req_ctx {
  42         struct scatterlist src[3];
  43         struct scatterlist dst[3];
  44         struct aead_request subreq;
  45 };
  46
  47 struct crypto_rfc4543_instance_ctx {
  48         struct crypto_aead_spawn aead;
  49 };
  50
  51 struct crypto_rfc4543_ctx {
  52         struct crypto_aead *child;
  53         struct crypto_skcipher *null;
  54         u8 nonce[4];
  55 };
  56
  57 struct crypto_rfc4543_req_ctx {
  58         struct aead_request subreq;
  59 };
  60
  61 struct crypto_gcm_ghash_ctx {
  62         unsigned int cryptlen;
  63         struct scatterlist *src;
  64         int (*complete)(struct aead_request *req, u32 flags);
  65 };
  66
  67 struct crypto_gcm_req_priv_ctx {
  68         u8 iv[16];
  69         u8 auth_tag[16];
  70         u8 iauth_tag[16];
  71         struct scatterlist src[3];
  72         struct scatterlist dst[3];
  73         struct scatterlist sg;
  74         struct crypto_gcm_ghash_ctx ghash_ctx;
  75         union {
  76                 struct ahash_request ahreq;
  77                 struct skcipher_request skreq;
  78         } u;
  79 };
  80
  81 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_skcipher *ctr = ctx->ctr;
 118         struct {
 119                 be128 hash;
 120                 u8 iv[16];
 121
 122                 struct crypto_gcm_setkey_result result;
 123
 124                 struct scatterlist sg[1];
 125                 struct skcipher_request req;
 126         } *data;
 127         int err;
 128
 129         crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
 130         crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
 131                                        CRYPTO_TFM_REQ_MASK);
 132         err = crypto_skcipher_setkey(ctr, key, keylen);
 133         crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
 134                                     CRYPTO_TFM_RES_MASK);
 135         if (err)
 136                 return err;
 137
 138         data = kzalloc(sizeof(*data) + crypto_skcipher_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         skcipher_request_set_tfm(&data->req, ctr);
 146         skcipher_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         skcipher_request_set_crypt(&data->req, data->sg, data->sg,
 151                                    sizeof(data->hash), data->iv);
 152
 153         err = crypto_skcipher_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 skcipher_request *skreq = &pctx->u.skreq;
 227         struct scatterlist *dst;
 228
 229         dst = req->src == req->dst ? pctx->src : pctx->dst;
 230
 231         skcipher_request_set_tfm(skreq, ctx->ctr);
 232         skcipher_request_set_crypt(skreq, 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 skcipher_request *skreq = &pctx->u.skreq;
 498         u32 flags = aead_request_flags(req);
 499
 500         crypto_gcm_init_common(req);
 501         crypto_gcm_init_crypt(req, req->cryptlen);
 502         skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
 503
 504         return crypto_skcipher_encrypt(skreq) ?:
 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 skcipher_request *skreq = &pctx->u.skreq;
 537         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 538
 539         crypto_gcm_init_crypt(req, gctx->cryptlen);
 540         skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
 541         return crypto_skcipher_decrypt(skreq) ?: 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_skcipher *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 skcipher_request) +
 591                     crypto_skcipher_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_skcipher(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 skcipher_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                                     crypto_requires_sync(algt->type,
 644                                                          algt->mask));
 645         if (IS_ERR(ghash_alg))
 646                 return PTR_ERR(ghash_alg);
 647
 648         ghash = __crypto_hash_alg_common(ghash_alg);
 649
 650         err = -ENOMEM;
 651         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 652         if (!inst)
 653                 goto out_put_ghash;
 654
 655         ctx = aead_instance_ctx(inst);
 656         err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
 657                                       aead_crypto_instance(inst));
 658         if (err)
 659                 goto err_free_inst;
 660
 661         err = -EINVAL;
 662         if (ghash->digestsize != 16)
 663                 goto err_drop_ghash;
 664
 665         crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
 666         err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
 667                                    crypto_requires_sync(algt->type,
 668                                                         algt->mask));
 669         if (err)
 670                 goto err_drop_ghash;
 671
 672         ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
 673
 674         /* We only support 16-byte blocks. */
 675         err = -EINVAL;
 676         if (crypto_skcipher_alg_ivsize(ctr) != 16)
 677                 goto out_put_ctr;
 678
 679         /* Not a stream cipher? */
 680         if (ctr->base.cra_blocksize != 1)
 681                 goto out_put_ctr;
 682
 683         err = -ENAMETOOLONG;
 684         if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 685                      "gcm_base(%s,%s)", ctr->base.cra_driver_name,
 686                      ghash_alg->cra_driver_name) >=
 687             CRYPTO_MAX_ALG_NAME)
 688                 goto out_put_ctr;
 689
 690         memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
 691
 692         inst->alg.base.cra_flags = (ghash->base.cra_flags |
 693                                     ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
 694         inst->alg.base.cra_priority = (ghash->base.cra_priority +
 695                                        ctr->base.cra_priority) / 2;
 696         inst->alg.base.cra_blocksize = 1;
 697         inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
 698                                        ctr->base.cra_alignmask;
 699         inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
 700         inst->alg.ivsize = 12;
 701         inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
 702         inst->alg.maxauthsize = 16;
 703         inst->alg.init = crypto_gcm_init_tfm;
 704         inst->alg.exit = crypto_gcm_exit_tfm;
 705         inst->alg.setkey = crypto_gcm_setkey;
 706         inst->alg.setauthsize = crypto_gcm_setauthsize;
 707         inst->alg.encrypt = crypto_gcm_encrypt;
 708         inst->alg.decrypt = crypto_gcm_decrypt;
 709
 710         inst->free = crypto_gcm_free;
 711
 712         err = aead_register_instance(tmpl, inst);
 713         if (err)
 714                 goto out_put_ctr;
 715
 716 out_put_ghash:
 717         crypto_mod_put(ghash_alg);
 718         return err;
 719
 720 out_put_ctr:
 721         crypto_drop_skcipher(&ctx->ctr);
 722 err_drop_ghash:
 723         crypto_drop_ahash(&ctx->ghash);
 724 err_free_inst:
 725         kfree(inst);
 726         goto out_put_ghash;
 727 }
 728
 729 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
 730 {
 731         const char *cipher_name;
 732         char ctr_name[CRYPTO_MAX_ALG_NAME];
 733         char full_name[CRYPTO_MAX_ALG_NAME];
 734
 735         cipher_name = crypto_attr_alg_name(tb[1]);
 736         if (IS_ERR(cipher_name))
 737                 return PTR_ERR(cipher_name);
 738
 739         if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
 740             CRYPTO_MAX_ALG_NAME)
 741                 return -ENAMETOOLONG;
 742
 743         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
 744             CRYPTO_MAX_ALG_NAME)
 745                 return -ENAMETOOLONG;
 746
 747         return crypto_gcm_create_common(tmpl, tb, full_name,
 748                                         ctr_name, "ghash");
 749 }
 750
 751 static struct crypto_template crypto_gcm_tmpl = {
 752         .name = "gcm",
 753         .create = crypto_gcm_create,
 754         .module = THIS_MODULE,
 755 };
 756
 757 static int crypto_gcm_base_create(struct crypto_template *tmpl,
 758                                   struct rtattr **tb)
 759 {
 760         const char *ctr_name;
 761         const char *ghash_name;
 762         char full_name[CRYPTO_MAX_ALG_NAME];
 763
 764         ctr_name = crypto_attr_alg_name(tb[1]);
 765         if (IS_ERR(ctr_name))
 766                 return PTR_ERR(ctr_name);
 767
 768         ghash_name = crypto_attr_alg_name(tb[2]);
 769         if (IS_ERR(ghash_name))
 770                 return PTR_ERR(ghash_name);
 771
 772         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
 773                      ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
 774                 return -ENAMETOOLONG;
 775
 776         return crypto_gcm_create_common(tmpl, tb, full_name,
 777                                         ctr_name, ghash_name);
 778 }
 779
 780 static struct crypto_template crypto_gcm_base_tmpl = {
 781         .name = "gcm_base",
 782         .create = crypto_gcm_base_create,
 783         .module = THIS_MODULE,
 784 };
 785
 786 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
 787                                  unsigned int keylen)
 788 {
 789         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 790         struct crypto_aead *child = ctx->child;
 791         int err;
 792
 793         if (keylen < 4)
 794                 return -EINVAL;
 795
 796         keylen -= 4;
 797         memcpy(ctx->nonce, key + keylen, 4);
 798
 799         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 800         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 801                                      CRYPTO_TFM_REQ_MASK);
 802         err = crypto_aead_setkey(child, key, keylen);
 803         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 804                                       CRYPTO_TFM_RES_MASK);
 805
 806         return err;
 807 }
 808
 809 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
 810                                       unsigned int authsize)
 811 {
 812         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 813
 814         switch (authsize) {
 815         case 8:
 816         case 12:
 817         case 16:
 818                 break;
 819         default:
 820                 return -EINVAL;
 821         }
 822
 823         return crypto_aead_setauthsize(ctx->child, authsize);
 824 }
 825
 826 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
 827 {
 828         struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
 829         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 830         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
 831         struct aead_request *subreq = &rctx->subreq;
 832         struct crypto_aead *child = ctx->child;
 833         struct scatterlist *sg;
 834         u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
 835                            crypto_aead_alignmask(child) + 1);
 836
 837         scatterwalk_map_and_copy(iv + 12, req->src, 0, req->assoclen - 8, 0);
 838
 839         memcpy(iv, ctx->nonce, 4);
 840         memcpy(iv + 4, req->iv, 8);
 841
 842         sg_init_table(rctx->src, 3);
 843         sg_set_buf(rctx->src, iv + 12, req->assoclen - 8);
 844         sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
 845         if (sg != rctx->src + 1)
 846                 sg_chain(rctx->src, 2, sg);
 847
 848         if (req->src != req->dst) {
 849                 sg_init_table(rctx->dst, 3);
 850                 sg_set_buf(rctx->dst, iv + 12, req->assoclen - 8);
 851                 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
 852                 if (sg != rctx->dst + 1)
 853                         sg_chain(rctx->dst, 2, sg);
 854         }
 855
 856         aead_request_set_tfm(subreq, child);
 857         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
 858                                   req->base.data);
 859         aead_request_set_crypt(subreq, rctx->src,
 860                                req->src == req->dst ? rctx->src : rctx->dst,
 861                                req->cryptlen, iv);
 862         aead_request_set_ad(subreq, req->assoclen - 8);
 863
 864         return subreq;
 865 }
 866
 867 static int crypto_rfc4106_encrypt(struct aead_request *req)
 868 {
 869         if (req->assoclen != 16 && req->assoclen != 20)
 870                 return -EINVAL;
 871
 872         req = crypto_rfc4106_crypt(req);
 873
 874         return crypto_aead_encrypt(req);
 875 }
 876
 877 static int crypto_rfc4106_decrypt(struct aead_request *req)
 878 {
 879         if (req->assoclen != 16 && req->assoclen != 20)
 880                 return -EINVAL;
 881
 882         req = crypto_rfc4106_crypt(req);
 883
 884         return crypto_aead_decrypt(req);
 885 }
 886
 887 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
 888 {
 889         struct aead_instance *inst = aead_alg_instance(tfm);
 890         struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
 891         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 892         struct crypto_aead *aead;
 893         unsigned long align;
 894
 895         aead = crypto_spawn_aead(spawn);
 896         if (IS_ERR(aead))
 897                 return PTR_ERR(aead);
 898
 899         ctx->child = aead;
 900
 901         align = crypto_aead_alignmask(aead);
 902         align &= ~(crypto_tfm_ctx_alignment() - 1);
 903         crypto_aead_set_reqsize(
 904                 tfm,
 905                 sizeof(struct crypto_rfc4106_req_ctx) +
 906                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
 907                 align + 24);
 908
 909         return 0;
 910 }
 911
 912 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
 913 {
 914         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
 915
 916         crypto_free_aead(ctx->child);
 917 }
 918
 919 static void crypto_rfc4106_free(struct aead_instance *inst)
 920 {
 921         crypto_drop_aead(aead_instance_ctx(inst));
 922         kfree(inst);
 923 }
 924
 925 static int crypto_rfc4106_create(struct crypto_template *tmpl,
 926                                  struct rtattr **tb)
 927 {
 928         struct crypto_attr_type *algt;
 929         struct aead_instance *inst;
 930         struct crypto_aead_spawn *spawn;
 931         struct aead_alg *alg;
 932         const char *ccm_name;
 933         int err;
 934
 935         algt = crypto_get_attr_type(tb);
 936         if (IS_ERR(algt))
 937                 return PTR_ERR(algt);
 938
 939         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 940                 return -EINVAL;
 941
 942         ccm_name = crypto_attr_alg_name(tb[1]);
 943         if (IS_ERR(ccm_name))
 944                 return PTR_ERR(ccm_name);
 945
 946         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 947         if (!inst)
 948                 return -ENOMEM;
 949
 950         spawn = aead_instance_ctx(inst);
 951         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
 952         err = crypto_grab_aead(spawn, ccm_name, 0,
 953                                crypto_requires_sync(algt->type, algt->mask));
 954         if (err)
 955                 goto out_free_inst;
 956
 957         alg = crypto_spawn_aead_alg(spawn);
 958
 959         err = -EINVAL;
 960
 961         /* Underlying IV size must be 12. */
 962         if (crypto_aead_alg_ivsize(alg) != 12)
 963                 goto out_drop_alg;
 964
 965         /* Not a stream cipher? */
 966         if (alg->base.cra_blocksize != 1)
 967                 goto out_drop_alg;
 968
 969         err = -ENAMETOOLONG;
 970         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 971                      "rfc4106(%s)", alg->base.cra_name) >=
 972             CRYPTO_MAX_ALG_NAME ||
 973             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 974                      "rfc4106(%s)", alg->base.cra_driver_name) >=
 975             CRYPTO_MAX_ALG_NAME)
 976                 goto out_drop_alg;
 977
 978         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
 979         inst->alg.base.cra_priority = alg->base.cra_priority;
 980         inst->alg.base.cra_blocksize = 1;
 981         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
 982
 983         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
 984
 985         inst->alg.ivsize = 8;
 986         inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
 987         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
 988
 989         inst->alg.init = crypto_rfc4106_init_tfm;
 990         inst->alg.exit = crypto_rfc4106_exit_tfm;
 991
 992         inst->alg.setkey = crypto_rfc4106_setkey;
 993         inst->alg.setauthsize = crypto_rfc4106_setauthsize;
 994         inst->alg.encrypt = crypto_rfc4106_encrypt;
 995         inst->alg.decrypt = crypto_rfc4106_decrypt;
 996
 997         inst->free = crypto_rfc4106_free;
 998
 999         err = aead_register_instance(tmpl, inst);
1000         if (err)
1001                 goto out_drop_alg;
1002
1003 out:
1004         return err;
1005
1006 out_drop_alg:
1007         crypto_drop_aead(spawn);
1008 out_free_inst:
1009         kfree(inst);
1010         goto out;
1011 }
1012
1013 static struct crypto_template crypto_rfc4106_tmpl = {
1014         .name = "rfc4106",
1015         .create = crypto_rfc4106_create,
1016         .module = THIS_MODULE,
1017 };
1018
1019 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1020                                  unsigned int keylen)
1021 {
1022         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1023         struct crypto_aead *child = ctx->child;
1024         int err;
1025
1026         if (keylen < 4)
1027                 return -EINVAL;
1028
1029         keylen -= 4;
1030         memcpy(ctx->nonce, key + keylen, 4);
1031
1032         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1033         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1034                                      CRYPTO_TFM_REQ_MASK);
1035         err = crypto_aead_setkey(child, key, keylen);
1036         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1037                                       CRYPTO_TFM_RES_MASK);
1038
1039         return err;
1040 }
1041
1042 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1043                                       unsigned int authsize)
1044 {
1045         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1046
1047         if (authsize != 16)
1048                 return -EINVAL;
1049
1050         return crypto_aead_setauthsize(ctx->child, authsize);
1051 }
1052
1053 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1054 {
1055         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1056         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1057         struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1058         struct aead_request *subreq = &rctx->subreq;
1059         unsigned int authsize = crypto_aead_authsize(aead);
1060         u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1061                            crypto_aead_alignmask(ctx->child) + 1);
1062         int err;
1063
1064         if (req->src != req->dst) {
1065                 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1066                 if (err)
1067                         return err;
1068         }
1069
1070         memcpy(iv, ctx->nonce, 4);
1071         memcpy(iv + 4, req->iv, 8);
1072
1073         aead_request_set_tfm(subreq, ctx->child);
1074         aead_request_set_callback(subreq, req->base.flags,
1075                                   req->base.complete, req->base.data);
1076         aead_request_set_crypt(subreq, req->src, req->dst,
1077                                enc ? 0 : authsize, iv);
1078         aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1079                                     subreq->cryptlen);
1080
1081         return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1082 }
1083
1084 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1085 {
1086         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1087         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1088         unsigned int authsize = crypto_aead_authsize(aead);
1089         unsigned int nbytes = req->assoclen + req->cryptlen -
1090                               (enc ? 0 : authsize);
1091         SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1092
1093         skcipher_request_set_tfm(nreq, ctx->null);
1094         skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1095         skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1096
1097         return crypto_skcipher_encrypt(nreq);
1098 }
1099
1100 static int crypto_rfc4543_encrypt(struct aead_request *req)
1101 {
1102         return crypto_rfc4543_crypt(req, true);
1103 }
1104
1105 static int crypto_rfc4543_decrypt(struct aead_request *req)
1106 {
1107         return crypto_rfc4543_crypt(req, false);
1108 }
1109
1110 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1111 {
1112         struct aead_instance *inst = aead_alg_instance(tfm);
1113         struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1114         struct crypto_aead_spawn *spawn = &ictx->aead;
1115         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1116         struct crypto_aead *aead;
1117         struct crypto_skcipher *null;
1118         unsigned long align;
1119         int err = 0;
1120
1121         aead = crypto_spawn_aead(spawn);
1122         if (IS_ERR(aead))
1123                 return PTR_ERR(aead);
1124
1125         null = crypto_get_default_null_skcipher2();
1126         err = PTR_ERR(null);
1127         if (IS_ERR(null))
1128                 goto err_free_aead;
1129
1130         ctx->child = aead;
1131         ctx->null = null;
1132
1133         align = crypto_aead_alignmask(aead);
1134         align &= ~(crypto_tfm_ctx_alignment() - 1);
1135         crypto_aead_set_reqsize(
1136                 tfm,
1137                 sizeof(struct crypto_rfc4543_req_ctx) +
1138                 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1139                 align + 12);
1140
1141         return 0;
1142
1143 err_free_aead:
1144         crypto_free_aead(aead);
1145         return err;
1146 }
1147
1148 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1149 {
1150         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1151
1152         crypto_free_aead(ctx->child);
1153         crypto_put_default_null_skcipher2();
1154 }
1155
1156 static void crypto_rfc4543_free(struct aead_instance *inst)
1157 {
1158         struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1159
1160         crypto_drop_aead(&ctx->aead);
1161
1162         kfree(inst);
1163 }
1164
1165 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1166                                 struct rtattr **tb)
1167 {
1168         struct crypto_attr_type *algt;
1169         struct aead_instance *inst;
1170         struct crypto_aead_spawn *spawn;
1171         struct aead_alg *alg;
1172         struct crypto_rfc4543_instance_ctx *ctx;
1173         const char *ccm_name;
1174         int err;
1175
1176         algt = crypto_get_attr_type(tb);
1177         if (IS_ERR(algt))
1178                 return PTR_ERR(algt);
1179
1180         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1181                 return -EINVAL;
1182
1183         ccm_name = crypto_attr_alg_name(tb[1]);
1184         if (IS_ERR(ccm_name))
1185                 return PTR_ERR(ccm_name);
1186
1187         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1188         if (!inst)
1189                 return -ENOMEM;
1190
1191         ctx = aead_instance_ctx(inst);
1192         spawn = &ctx->aead;
1193         crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1194         err = crypto_grab_aead(spawn, ccm_name, 0,
1195                                crypto_requires_sync(algt->type, algt->mask));
1196         if (err)
1197                 goto out_free_inst;
1198
1199         alg = crypto_spawn_aead_alg(spawn);
1200
1201         err = -EINVAL;
1202
1203         /* Underlying IV size must be 12. */
1204         if (crypto_aead_alg_ivsize(alg) != 12)
1205                 goto out_drop_alg;
1206
1207         /* Not a stream cipher? */
1208         if (alg->base.cra_blocksize != 1)
1209                 goto out_drop_alg;
1210
1211         err = -ENAMETOOLONG;
1212         if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1213                      "rfc4543(%s)", alg->base.cra_name) >=
1214             CRYPTO_MAX_ALG_NAME ||
1215             snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1216                      "rfc4543(%s)", alg->base.cra_driver_name) >=
1217             CRYPTO_MAX_ALG_NAME)
1218                 goto out_drop_alg;
1219
1220         inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1221         inst->alg.base.cra_priority = alg->base.cra_priority;
1222         inst->alg.base.cra_blocksize = 1;
1223         inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1224
1225         inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1226
1227         inst->alg.ivsize = 8;
1228         inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1229         inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1230
1231         inst->alg.init = crypto_rfc4543_init_tfm;
1232         inst->alg.exit = crypto_rfc4543_exit_tfm;
1233
1234         inst->alg.setkey = crypto_rfc4543_setkey;
1235         inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1236         inst->alg.encrypt = crypto_rfc4543_encrypt;
1237         inst->alg.decrypt = crypto_rfc4543_decrypt;
1238
1239         inst->free = crypto_rfc4543_free,
1240
1241         err = aead_register_instance(tmpl, inst);
1242         if (err)
1243                 goto out_drop_alg;
1244
1245 out:
1246         return err;
1247
1248 out_drop_alg:
1249         crypto_drop_aead(spawn);
1250 out_free_inst:
1251         kfree(inst);
1252         goto out;
1253 }
1254
1255 static struct crypto_template crypto_rfc4543_tmpl = {
1256         .name = "rfc4543",
1257         .create = crypto_rfc4543_create,
1258         .module = THIS_MODULE,
1259 };
1260
1261 static int __init crypto_gcm_module_init(void)
1262 {
1263         int err;
1264
1265         gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1266         if (!gcm_zeroes)
1267                 return -ENOMEM;
1268
1269         sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1270
1271         err = crypto_register_template(&crypto_gcm_base_tmpl);
1272         if (err)
1273                 goto out;
1274
1275         err = crypto_register_template(&crypto_gcm_tmpl);
1276         if (err)
1277                 goto out_undo_base;
1278
1279         err = crypto_register_template(&crypto_rfc4106_tmpl);
1280         if (err)
1281                 goto out_undo_gcm;
1282
1283         err = crypto_register_template(&crypto_rfc4543_tmpl);
1284         if (err)
1285                 goto out_undo_rfc4106;
1286
1287         return 0;
1288
1289 out_undo_rfc4106:
1290         crypto_unregister_template(&crypto_rfc4106_tmpl);
1291 out_undo_gcm:
1292         crypto_unregister_template(&crypto_gcm_tmpl);
1293 out_undo_base:
1294         crypto_unregister_template(&crypto_gcm_base_tmpl);
1295 out:
1296         kfree(gcm_zeroes);
1297         return err;
1298 }
1299
1300 static void __exit crypto_gcm_module_exit(void)
1301 {
1302         kfree(gcm_zeroes);
1303         crypto_unregister_template(&crypto_rfc4543_tmpl);
1304         crypto_unregister_template(&crypto_rfc4106_tmpl);
1305         crypto_unregister_template(&crypto_gcm_tmpl);
1306         crypto_unregister_template(&crypto_gcm_base_tmpl);
1307 }
1308
1309 module_init(crypto_gcm_module_init);
1310 module_exit(crypto_gcm_module_exit);
1311
1312 MODULE_LICENSE("GPL");
1313 MODULE_DESCRIPTION("Galois/Counter Mode");
1314 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1315 MODULE_ALIAS_CRYPTO("gcm_base");
1316 MODULE_ALIAS_CRYPTO("rfc4106");
1317 MODULE_ALIAS_CRYPTO("rfc4543");
1318 MODULE_ALIAS_CRYPTO("gcm");