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