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/scatterwalk.h>
  16 #include <crypto/hash.h>
  17 #include "internal.h"
  18 #include <linux/completion.h>
  19 #include <linux/err.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24
  25 struct gcm_instance_ctx {
  26         struct crypto_skcipher_spawn ctr;
  27         struct crypto_ahash_spawn ghash;
  28 };
  29
  30 struct crypto_gcm_ctx {
  31         struct crypto_ablkcipher *ctr;
  32         struct crypto_ahash *ghash;
  33 };
  34
  35 struct crypto_rfc4106_ctx {
  36         struct crypto_aead *child;
  37         u8 nonce[4];
  38 };
  39
  40 struct crypto_rfc4543_instance_ctx {
  41         struct crypto_aead_spawn aead;
  42         struct crypto_skcipher_spawn null;
  43 };
  44
  45 struct crypto_rfc4543_ctx {
  46         struct crypto_aead *child;
  47         struct crypto_blkcipher *null;
  48         u8 nonce[4];
  49 };
  50
  51 struct crypto_rfc4543_req_ctx {
  52         u8 auth_tag[16];
  53         u8 assocbuf[32];
  54         struct scatterlist cipher[1];
  55         struct scatterlist payload[2];
  56         struct scatterlist assoc[2];
  57         struct aead_request subreq;
  58 };
  59
  60 struct crypto_gcm_ghash_ctx {
  61         unsigned int cryptlen;
  62         struct scatterlist *src;
  63         void (*complete)(struct aead_request *req, int err);
  64 };
  65
  66 struct crypto_gcm_req_priv_ctx {
  67         u8 auth_tag[16];
  68         u8 iauth_tag[16];
  69         struct scatterlist src[2];
  70         struct scatterlist dst[2];
  71         struct crypto_gcm_ghash_ctx ghash_ctx;
  72         union {
  73                 struct ahash_request ahreq;
  74                 struct ablkcipher_request abreq;
  75         } u;
  76 };
  77
  78 struct crypto_gcm_setkey_result {
  79         int err;
  80         struct completion completion;
  81 };
  82
  83 static void *gcm_zeroes;
  84
  85 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
  86         struct aead_request *req)
  87 {
  88         unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
  89
  90         return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
  91 }
  92
  93 static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
  94 {
  95         struct crypto_gcm_setkey_result *result = req->data;
  96
  97         if (err == -EINPROGRESS)
  98                 return;
  99
 100         result->err = err;
 101         complete(&result->completion);
 102 }
 103
 104 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
 105                              unsigned int keylen)
 106 {
 107         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 108         struct crypto_ahash *ghash = ctx->ghash;
 109         struct crypto_ablkcipher *ctr = ctx->ctr;
 110         struct {
 111                 be128 hash;
 112                 u8 iv[8];
 113
 114                 struct crypto_gcm_setkey_result result;
 115
 116                 struct scatterlist sg[1];
 117                 struct ablkcipher_request req;
 118         } *data;
 119         int err;
 120
 121         crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
 122         crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
 123                                    CRYPTO_TFM_REQ_MASK);
 124
 125         err = crypto_ablkcipher_setkey(ctr, key, keylen);
 126         if (err)
 127                 return err;
 128
 129         crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
 130                                        CRYPTO_TFM_RES_MASK);
 131
 132         data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
 133                        GFP_KERNEL);
 134         if (!data)
 135                 return -ENOMEM;
 136
 137         init_completion(&data->result.completion);
 138         sg_init_one(data->sg, &data->hash, sizeof(data->hash));
 139         ablkcipher_request_set_tfm(&data->req, ctr);
 140         ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
 141                                                     CRYPTO_TFM_REQ_MAY_BACKLOG,
 142                                         crypto_gcm_setkey_done,
 143                                         &data->result);
 144         ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
 145                                      sizeof(data->hash), data->iv);
 146
 147         err = crypto_ablkcipher_encrypt(&data->req);
 148         if (err == -EINPROGRESS || err == -EBUSY) {
 149                 err = wait_for_completion_interruptible(
 150                         &data->result.completion);
 151                 if (!err)
 152                         err = data->result.err;
 153         }
 154
 155         if (err)
 156                 goto out;
 157
 158         crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
 159         crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
 160                                CRYPTO_TFM_REQ_MASK);
 161         err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
 162         crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
 163                               CRYPTO_TFM_RES_MASK);
 164
 165 out:
 166         kfree(data);
 167         return err;
 168 }
 169
 170 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
 171                                   unsigned int authsize)
 172 {
 173         switch (authsize) {
 174         case 4:
 175         case 8:
 176         case 12:
 177         case 13:
 178         case 14:
 179         case 15:
 180         case 16:
 181                 break;
 182         default:
 183                 return -EINVAL;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
 190                                   struct aead_request *req,
 191                                   unsigned int cryptlen)
 192 {
 193         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 194         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 195         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 196         struct scatterlist *dst;
 197         __be32 counter = cpu_to_be32(1);
 198
 199         memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
 200         memcpy(req->iv + 12, &counter, 4);
 201
 202         sg_init_table(pctx->src, 2);
 203         sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
 204         scatterwalk_sg_chain(pctx->src, 2, req->src);
 205
 206         dst = pctx->src;
 207         if (req->src != req->dst) {
 208                 sg_init_table(pctx->dst, 2);
 209                 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
 210                 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
 211                 dst = pctx->dst;
 212         }
 213
 214         ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
 215         ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
 216                                      cryptlen + sizeof(pctx->auth_tag),
 217                                      req->iv);
 218 }
 219
 220 static inline unsigned int gcm_remain(unsigned int len)
 221 {
 222         len &= 0xfU;
 223         return len ? 16 - len : 0;
 224 }
 225
 226 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
 227 static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
 228
 229 static int gcm_hash_update(struct aead_request *req,
 230                            struct crypto_gcm_req_priv_ctx *pctx,
 231                            crypto_completion_t compl,
 232                            struct scatterlist *src,
 233                            unsigned int len)
 234 {
 235         struct ahash_request *ahreq = &pctx->u.ahreq;
 236
 237         ahash_request_set_callback(ahreq, aead_request_flags(req),
 238                                    compl, req);
 239         ahash_request_set_crypt(ahreq, src, NULL, len);
 240
 241         return crypto_ahash_update(ahreq);
 242 }
 243
 244 static int gcm_hash_remain(struct aead_request *req,
 245                            struct crypto_gcm_req_priv_ctx *pctx,
 246                            unsigned int remain,
 247                            crypto_completion_t compl)
 248 {
 249         struct ahash_request *ahreq = &pctx->u.ahreq;
 250
 251         ahash_request_set_callback(ahreq, aead_request_flags(req),
 252                                    compl, req);
 253         sg_init_one(pctx->src, gcm_zeroes, remain);
 254         ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
 255
 256         return crypto_ahash_update(ahreq);
 257 }
 258
 259 static int gcm_hash_len(struct aead_request *req,
 260                         struct crypto_gcm_req_priv_ctx *pctx)
 261 {
 262         struct ahash_request *ahreq = &pctx->u.ahreq;
 263         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 264         u128 lengths;
 265
 266         lengths.a = cpu_to_be64(req->assoclen * 8);
 267         lengths.b = cpu_to_be64(gctx->cryptlen * 8);
 268         memcpy(pctx->iauth_tag, &lengths, 16);
 269         sg_init_one(pctx->src, pctx->iauth_tag, 16);
 270         ahash_request_set_callback(ahreq, aead_request_flags(req),
 271                                    gcm_hash_len_done, req);
 272         ahash_request_set_crypt(ahreq, pctx->src,
 273                                 NULL, sizeof(lengths));
 274
 275         return crypto_ahash_update(ahreq);
 276 }
 277
 278 static int gcm_hash_final(struct aead_request *req,
 279                           struct crypto_gcm_req_priv_ctx *pctx)
 280 {
 281         struct ahash_request *ahreq = &pctx->u.ahreq;
 282
 283         ahash_request_set_callback(ahreq, aead_request_flags(req),
 284                                    gcm_hash_final_done, req);
 285         ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
 286
 287         return crypto_ahash_final(ahreq);
 288 }
 289
 290 static void __gcm_hash_final_done(struct aead_request *req, int err)
 291 {
 292         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 293         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 294
 295         if (!err)
 296                 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
 297
 298         gctx->complete(req, err);
 299 }
 300
 301 static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
 302 {
 303         struct aead_request *req = areq->data;
 304
 305         __gcm_hash_final_done(req, err);
 306 }
 307
 308 static void __gcm_hash_len_done(struct aead_request *req, int err)
 309 {
 310         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 311
 312         if (!err) {
 313                 err = gcm_hash_final(req, pctx);
 314                 if (err == -EINPROGRESS || err == -EBUSY)
 315                         return;
 316         }
 317
 318         __gcm_hash_final_done(req, err);
 319 }
 320
 321 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
 322 {
 323         struct aead_request *req = areq->data;
 324
 325         __gcm_hash_len_done(req, err);
 326 }
 327
 328 static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
 329 {
 330         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 331
 332         if (!err) {
 333                 err = gcm_hash_len(req, pctx);
 334                 if (err == -EINPROGRESS || err == -EBUSY)
 335                         return;
 336         }
 337
 338         __gcm_hash_len_done(req, err);
 339 }
 340
 341 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
 342                                        int err)
 343 {
 344         struct aead_request *req = areq->data;
 345
 346         __gcm_hash_crypt_remain_done(req, err);
 347 }
 348
 349 static void __gcm_hash_crypt_done(struct aead_request *req, int err)
 350 {
 351         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 352         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 353         unsigned int remain;
 354
 355         if (!err) {
 356                 remain = gcm_remain(gctx->cryptlen);
 357                 BUG_ON(!remain);
 358                 err = gcm_hash_remain(req, pctx, remain,
 359                                       gcm_hash_crypt_remain_done);
 360                 if (err == -EINPROGRESS || err == -EBUSY)
 361                         return;
 362         }
 363
 364         __gcm_hash_crypt_remain_done(req, err);
 365 }
 366
 367 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
 368 {
 369         struct aead_request *req = areq->data;
 370
 371         __gcm_hash_crypt_done(req, err);
 372 }
 373
 374 static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
 375 {
 376         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 377         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 378         crypto_completion_t compl;
 379         unsigned int remain = 0;
 380
 381         if (!err && gctx->cryptlen) {
 382                 remain = gcm_remain(gctx->cryptlen);
 383                 compl = remain ? gcm_hash_crypt_done :
 384                         gcm_hash_crypt_remain_done;
 385                 err = gcm_hash_update(req, pctx, compl,
 386                                       gctx->src, gctx->cryptlen);
 387                 if (err == -EINPROGRESS || err == -EBUSY)
 388                         return;
 389         }
 390
 391         if (remain)
 392                 __gcm_hash_crypt_done(req, err);
 393         else
 394                 __gcm_hash_crypt_remain_done(req, err);
 395 }
 396
 397 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
 398                                        int err)
 399 {
 400         struct aead_request *req = areq->data;
 401
 402         __gcm_hash_assoc_remain_done(req, err);
 403 }
 404
 405 static void __gcm_hash_assoc_done(struct aead_request *req, int err)
 406 {
 407         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 408         unsigned int remain;
 409
 410         if (!err) {
 411                 remain = gcm_remain(req->assoclen);
 412                 BUG_ON(!remain);
 413                 err = gcm_hash_remain(req, pctx, remain,
 414                                       gcm_hash_assoc_remain_done);
 415                 if (err == -EINPROGRESS || err == -EBUSY)
 416                         return;
 417         }
 418
 419         __gcm_hash_assoc_remain_done(req, err);
 420 }
 421
 422 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
 423 {
 424         struct aead_request *req = areq->data;
 425
 426         __gcm_hash_assoc_done(req, err);
 427 }
 428
 429 static void __gcm_hash_init_done(struct aead_request *req, int err)
 430 {
 431         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 432         crypto_completion_t compl;
 433         unsigned int remain = 0;
 434
 435         if (!err && req->assoclen) {
 436                 remain = gcm_remain(req->assoclen);
 437                 compl = remain ? gcm_hash_assoc_done :
 438                         gcm_hash_assoc_remain_done;
 439                 err = gcm_hash_update(req, pctx, compl,
 440                                       req->assoc, req->assoclen);
 441                 if (err == -EINPROGRESS || err == -EBUSY)
 442                         return;
 443         }
 444
 445         if (remain)
 446                 __gcm_hash_assoc_done(req, err);
 447         else
 448                 __gcm_hash_assoc_remain_done(req, err);
 449 }
 450
 451 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
 452 {
 453         struct aead_request *req = areq->data;
 454
 455         __gcm_hash_init_done(req, err);
 456 }
 457
 458 static int gcm_hash(struct aead_request *req,
 459                     struct crypto_gcm_req_priv_ctx *pctx)
 460 {
 461         struct ahash_request *ahreq = &pctx->u.ahreq;
 462         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 463         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 464         unsigned int remain;
 465         crypto_completion_t compl;
 466         int err;
 467
 468         ahash_request_set_tfm(ahreq, ctx->ghash);
 469
 470         ahash_request_set_callback(ahreq, aead_request_flags(req),
 471                                    gcm_hash_init_done, req);
 472         err = crypto_ahash_init(ahreq);
 473         if (err)
 474                 return err;
 475         remain = gcm_remain(req->assoclen);
 476         compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
 477         err = gcm_hash_update(req, pctx, compl, req->assoc, req->assoclen);
 478         if (err)
 479                 return err;
 480         if (remain) {
 481                 err = gcm_hash_remain(req, pctx, remain,
 482                                       gcm_hash_assoc_remain_done);
 483                 if (err)
 484                         return err;
 485         }
 486         remain = gcm_remain(gctx->cryptlen);
 487         compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
 488         err = gcm_hash_update(req, pctx, compl, gctx->src, gctx->cryptlen);
 489         if (err)
 490                 return err;
 491         if (remain) {
 492                 err = gcm_hash_remain(req, pctx, remain,
 493                                       gcm_hash_crypt_remain_done);
 494                 if (err)
 495                         return err;
 496         }
 497         err = gcm_hash_len(req, pctx);
 498         if (err)
 499                 return err;
 500         err = gcm_hash_final(req, pctx);
 501         if (err)
 502                 return err;
 503
 504         return 0;
 505 }
 506
 507 static void gcm_enc_copy_hash(struct aead_request *req,
 508                               struct crypto_gcm_req_priv_ctx *pctx)
 509 {
 510         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 511         u8 *auth_tag = pctx->auth_tag;
 512
 513         scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
 514                                  crypto_aead_authsize(aead), 1);
 515 }
 516
 517 static void gcm_enc_hash_done(struct aead_request *req, int err)
 518 {
 519         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 520
 521         if (!err)
 522                 gcm_enc_copy_hash(req, pctx);
 523
 524         aead_request_complete(req, err);
 525 }
 526
 527 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
 528 {
 529         struct aead_request *req = areq->data;
 530         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 531
 532         if (!err) {
 533                 err = gcm_hash(req, pctx);
 534                 if (err == -EINPROGRESS || err == -EBUSY)
 535                         return;
 536                 else if (!err) {
 537                         crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
 538                         gcm_enc_copy_hash(req, pctx);
 539                 }
 540         }
 541
 542         aead_request_complete(req, err);
 543 }
 544
 545 static int crypto_gcm_encrypt(struct aead_request *req)
 546 {
 547         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 548         struct ablkcipher_request *abreq = &pctx->u.abreq;
 549         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 550         int err;
 551
 552         crypto_gcm_init_crypt(abreq, req, req->cryptlen);
 553         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
 554                                         gcm_encrypt_done, req);
 555
 556         gctx->src = req->dst;
 557         gctx->cryptlen = req->cryptlen;
 558         gctx->complete = gcm_enc_hash_done;
 559
 560         err = crypto_ablkcipher_encrypt(abreq);
 561         if (err)
 562                 return err;
 563
 564         err = gcm_hash(req, pctx);
 565         if (err)
 566                 return err;
 567
 568         crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
 569         gcm_enc_copy_hash(req, pctx);
 570
 571         return 0;
 572 }
 573
 574 static int crypto_gcm_verify(struct aead_request *req,
 575                              struct crypto_gcm_req_priv_ctx *pctx)
 576 {
 577         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 578         u8 *auth_tag = pctx->auth_tag;
 579         u8 *iauth_tag = pctx->iauth_tag;
 580         unsigned int authsize = crypto_aead_authsize(aead);
 581         unsigned int cryptlen = req->cryptlen - authsize;
 582
 583         crypto_xor(auth_tag, iauth_tag, 16);
 584         scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
 585         return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
 586 }
 587
 588 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
 589 {
 590         struct aead_request *req = areq->data;
 591         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 592
 593         if (!err)
 594                 err = crypto_gcm_verify(req, pctx);
 595
 596         aead_request_complete(req, err);
 597 }
 598
 599 static void gcm_dec_hash_done(struct aead_request *req, int err)
 600 {
 601         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 602         struct ablkcipher_request *abreq = &pctx->u.abreq;
 603         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 604
 605         if (!err) {
 606                 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
 607                                                 gcm_decrypt_done, req);
 608                 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
 609                 err = crypto_ablkcipher_decrypt(abreq);
 610                 if (err == -EINPROGRESS || err == -EBUSY)
 611                         return;
 612                 else if (!err)
 613                         err = crypto_gcm_verify(req, pctx);
 614         }
 615
 616         aead_request_complete(req, err);
 617 }
 618
 619 static int crypto_gcm_decrypt(struct aead_request *req)
 620 {
 621         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 622         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 623         struct ablkcipher_request *abreq = &pctx->u.abreq;
 624         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 625         unsigned int authsize = crypto_aead_authsize(aead);
 626         unsigned int cryptlen = req->cryptlen;
 627         int err;
 628
 629         if (cryptlen < authsize)
 630                 return -EINVAL;
 631         cryptlen -= authsize;
 632
 633         gctx->src = req->src;
 634         gctx->cryptlen = cryptlen;
 635         gctx->complete = gcm_dec_hash_done;
 636
 637         err = gcm_hash(req, pctx);
 638         if (err)
 639                 return err;
 640
 641         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
 642                                         gcm_decrypt_done, req);
 643         crypto_gcm_init_crypt(abreq, req, cryptlen);
 644         err = crypto_ablkcipher_decrypt(abreq);
 645         if (err)
 646                 return err;
 647
 648         return crypto_gcm_verify(req, pctx);
 649 }
 650
 651 static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
 652 {
 653         struct crypto_instance *inst = (void *)tfm->__crt_alg;
 654         struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
 655         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
 656         struct crypto_ablkcipher *ctr;
 657         struct crypto_ahash *ghash;
 658         unsigned long align;
 659         int err;
 660
 661         ghash = crypto_spawn_ahash(&ictx->ghash);
 662         if (IS_ERR(ghash))
 663                 return PTR_ERR(ghash);
 664
 665         ctr = crypto_spawn_skcipher(&ictx->ctr);
 666         err = PTR_ERR(ctr);
 667         if (IS_ERR(ctr))
 668                 goto err_free_hash;
 669
 670         ctx->ctr = ctr;
 671         ctx->ghash = ghash;
 672
 673         align = crypto_tfm_alg_alignmask(tfm);
 674         align &= ~(crypto_tfm_ctx_alignment() - 1);
 675         tfm->crt_aead.reqsize = align +
 676                 offsetof(struct crypto_gcm_req_priv_ctx, u) +
 677                 max(sizeof(struct ablkcipher_request) +
 678                     crypto_ablkcipher_reqsize(ctr),
 679                     sizeof(struct ahash_request) +
 680                     crypto_ahash_reqsize(ghash));
 681
 682         return 0;
 683
 684 err_free_hash:
 685         crypto_free_ahash(ghash);
 686         return err;
 687 }
 688
 689 static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
 690 {
 691         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
 692
 693         crypto_free_ahash(ctx->ghash);
 694         crypto_free_ablkcipher(ctx->ctr);
 695 }
 696
 697 static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
 698                                                        const char *full_name,
 699                                                        const char *ctr_name,
 700                                                        const char *ghash_name)
 701 {
 702         struct crypto_attr_type *algt;
 703         struct crypto_instance *inst;
 704         struct crypto_alg *ctr;
 705         struct crypto_alg *ghash_alg;
 706         struct ahash_alg *ghash_ahash_alg;
 707         struct gcm_instance_ctx *ctx;
 708         int err;
 709
 710         algt = crypto_get_attr_type(tb);
 711         if (IS_ERR(algt))
 712                 return ERR_CAST(algt);
 713
 714         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 715                 return ERR_PTR(-EINVAL);
 716
 717         ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
 718                                     CRYPTO_ALG_TYPE_HASH,
 719                                     CRYPTO_ALG_TYPE_AHASH_MASK |
 720                                     crypto_requires_sync(algt->type,
 721                                                          algt->mask));
 722         if (IS_ERR(ghash_alg))
 723                 return ERR_CAST(ghash_alg);
 724
 725         err = -ENOMEM;
 726         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 727         if (!inst)
 728                 goto out_put_ghash;
 729
 730         ctx = crypto_instance_ctx(inst);
 731         ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
 732         err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
 733                                       inst);
 734         if (err)
 735                 goto err_free_inst;
 736
 737         crypto_set_skcipher_spawn(&ctx->ctr, inst);
 738         err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
 739                                    crypto_requires_sync(algt->type,
 740                                                         algt->mask));
 741         if (err)
 742                 goto err_drop_ghash;
 743
 744         ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
 745
 746         /* We only support 16-byte blocks. */
 747         if (ctr->cra_ablkcipher.ivsize != 16)
 748                 goto out_put_ctr;
 749
 750         /* Not a stream cipher? */
 751         err = -EINVAL;
 752         if (ctr->cra_blocksize != 1)
 753                 goto out_put_ctr;
 754
 755         err = -ENAMETOOLONG;
 756         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 757                      "gcm_base(%s,%s)", ctr->cra_driver_name,
 758                      ghash_alg->cra_driver_name) >=
 759             CRYPTO_MAX_ALG_NAME)
 760                 goto out_put_ctr;
 761
 762         memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
 763
 764         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
 765         inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
 766         inst->alg.cra_priority = ctr->cra_priority;
 767         inst->alg.cra_blocksize = 1;
 768         inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
 769         inst->alg.cra_type = &crypto_aead_type;
 770         inst->alg.cra_aead.ivsize = 16;
 771         inst->alg.cra_aead.maxauthsize = 16;
 772         inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
 773         inst->alg.cra_init = crypto_gcm_init_tfm;
 774         inst->alg.cra_exit = crypto_gcm_exit_tfm;
 775         inst->alg.cra_aead.setkey = crypto_gcm_setkey;
 776         inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
 777         inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
 778         inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
 779
 780 out:
 781         crypto_mod_put(ghash_alg);
 782         return inst;
 783
 784 out_put_ctr:
 785         crypto_drop_skcipher(&ctx->ctr);
 786 err_drop_ghash:
 787         crypto_drop_ahash(&ctx->ghash);
 788 err_free_inst:
 789         kfree(inst);
 790 out_put_ghash:
 791         inst = ERR_PTR(err);
 792         goto out;
 793 }
 794
 795 static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
 796 {
 797         const char *cipher_name;
 798         char ctr_name[CRYPTO_MAX_ALG_NAME];
 799         char full_name[CRYPTO_MAX_ALG_NAME];
 800
 801         cipher_name = crypto_attr_alg_name(tb[1]);
 802         if (IS_ERR(cipher_name))
 803                 return ERR_CAST(cipher_name);
 804
 805         if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
 806             CRYPTO_MAX_ALG_NAME)
 807                 return ERR_PTR(-ENAMETOOLONG);
 808
 809         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
 810             CRYPTO_MAX_ALG_NAME)
 811                 return ERR_PTR(-ENAMETOOLONG);
 812
 813         return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
 814 }
 815
 816 static void crypto_gcm_free(struct crypto_instance *inst)
 817 {
 818         struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
 819
 820         crypto_drop_skcipher(&ctx->ctr);
 821         crypto_drop_ahash(&ctx->ghash);
 822         kfree(inst);
 823 }
 824
 825 static struct crypto_template crypto_gcm_tmpl = {
 826         .name = "gcm",
 827         .alloc = crypto_gcm_alloc,
 828         .free = crypto_gcm_free,
 829         .module = THIS_MODULE,
 830 };
 831
 832 static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
 833 {
 834         const char *ctr_name;
 835         const char *ghash_name;
 836         char full_name[CRYPTO_MAX_ALG_NAME];
 837
 838         ctr_name = crypto_attr_alg_name(tb[1]);
 839         if (IS_ERR(ctr_name))
 840                 return ERR_CAST(ctr_name);
 841
 842         ghash_name = crypto_attr_alg_name(tb[2]);
 843         if (IS_ERR(ghash_name))
 844                 return ERR_CAST(ghash_name);
 845
 846         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
 847                      ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
 848                 return ERR_PTR(-ENAMETOOLONG);
 849
 850         return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
 851 }
 852
 853 static struct crypto_template crypto_gcm_base_tmpl = {
 854         .name = "gcm_base",
 855         .alloc = crypto_gcm_base_alloc,
 856         .free = crypto_gcm_free,
 857         .module = THIS_MODULE,
 858 };
 859
 860 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
 861                                  unsigned int keylen)
 862 {
 863         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 864         struct crypto_aead *child = ctx->child;
 865         int err;
 866
 867         if (keylen < 4)
 868                 return -EINVAL;
 869
 870         keylen -= 4;
 871         memcpy(ctx->nonce, key + keylen, 4);
 872
 873         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 874         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 875                                      CRYPTO_TFM_REQ_MASK);
 876         err = crypto_aead_setkey(child, key, keylen);
 877         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 878                                       CRYPTO_TFM_RES_MASK);
 879
 880         return err;
 881 }
 882
 883 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
 884                                       unsigned int authsize)
 885 {
 886         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 887
 888         switch (authsize) {
 889         case 8:
 890         case 12:
 891         case 16:
 892                 break;
 893         default:
 894                 return -EINVAL;
 895         }
 896
 897         return crypto_aead_setauthsize(ctx->child, authsize);
 898 }
 899
 900 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
 901 {
 902         struct aead_request *subreq = aead_request_ctx(req);
 903         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 904         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
 905         struct crypto_aead *child = ctx->child;
 906         u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
 907                            crypto_aead_alignmask(child) + 1);
 908
 909         memcpy(iv, ctx->nonce, 4);
 910         memcpy(iv + 4, req->iv, 8);
 911
 912         aead_request_set_tfm(subreq, child);
 913         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
 914                                   req->base.data);
 915         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
 916         aead_request_set_assoc(subreq, req->assoc, req->assoclen);
 917
 918         return subreq;
 919 }
 920
 921 static int crypto_rfc4106_encrypt(struct aead_request *req)
 922 {
 923         req = crypto_rfc4106_crypt(req);
 924
 925         return crypto_aead_encrypt(req);
 926 }
 927
 928 static int crypto_rfc4106_decrypt(struct aead_request *req)
 929 {
 930         req = crypto_rfc4106_crypt(req);
 931
 932         return crypto_aead_decrypt(req);
 933 }
 934
 935 static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
 936 {
 937         struct crypto_instance *inst = (void *)tfm->__crt_alg;
 938         struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
 939         struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
 940         struct crypto_aead *aead;
 941         unsigned long align;
 942
 943         aead = crypto_spawn_aead(spawn);
 944         if (IS_ERR(aead))
 945                 return PTR_ERR(aead);
 946
 947         ctx->child = aead;
 948
 949         align = crypto_aead_alignmask(aead);
 950         align &= ~(crypto_tfm_ctx_alignment() - 1);
 951         tfm->crt_aead.reqsize = sizeof(struct aead_request) +
 952                                 ALIGN(crypto_aead_reqsize(aead),
 953                                       crypto_tfm_ctx_alignment()) +
 954                                 align + 16;
 955
 956         return 0;
 957 }
 958
 959 static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
 960 {
 961         struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
 962
 963         crypto_free_aead(ctx->child);
 964 }
 965
 966 static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
 967 {
 968         struct crypto_attr_type *algt;
 969         struct crypto_instance *inst;
 970         struct crypto_aead_spawn *spawn;
 971         struct crypto_alg *alg;
 972         const char *ccm_name;
 973         int err;
 974
 975         algt = crypto_get_attr_type(tb);
 976         if (IS_ERR(algt))
 977                 return ERR_CAST(algt);
 978
 979         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 980                 return ERR_PTR(-EINVAL);
 981
 982         ccm_name = crypto_attr_alg_name(tb[1]);
 983         if (IS_ERR(ccm_name))
 984                 return ERR_CAST(ccm_name);
 985
 986         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 987         if (!inst)
 988                 return ERR_PTR(-ENOMEM);
 989
 990         spawn = crypto_instance_ctx(inst);
 991         crypto_set_aead_spawn(spawn, inst);
 992         err = crypto_grab_aead(spawn, ccm_name, 0,
 993                                crypto_requires_sync(algt->type, algt->mask));
 994         if (err)
 995                 goto out_free_inst;
 996
 997         alg = crypto_aead_spawn_alg(spawn);
 998
 999         err = -EINVAL;
1000
1001         /* We only support 16-byte blocks. */
1002         if (alg->cra_aead.ivsize != 16)
1003                 goto out_drop_alg;
1004
1005         /* Not a stream cipher? */
1006         if (alg->cra_blocksize != 1)
1007                 goto out_drop_alg;
1008
1009         err = -ENAMETOOLONG;
1010         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1011                      "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1012             snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1013                      "rfc4106(%s)", alg->cra_driver_name) >=
1014             CRYPTO_MAX_ALG_NAME)
1015                 goto out_drop_alg;
1016
1017         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1018         inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1019         inst->alg.cra_priority = alg->cra_priority;
1020         inst->alg.cra_blocksize = 1;
1021         inst->alg.cra_alignmask = alg->cra_alignmask;
1022         inst->alg.cra_type = &crypto_nivaead_type;
1023
1024         inst->alg.cra_aead.ivsize = 8;
1025         inst->alg.cra_aead.maxauthsize = 16;
1026
1027         inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1028
1029         inst->alg.cra_init = crypto_rfc4106_init_tfm;
1030         inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1031
1032         inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1033         inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1034         inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1035         inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1036
1037         inst->alg.cra_aead.geniv = "seqiv";
1038
1039 out:
1040         return inst;
1041
1042 out_drop_alg:
1043         crypto_drop_aead(spawn);
1044 out_free_inst:
1045         kfree(inst);
1046         inst = ERR_PTR(err);
1047         goto out;
1048 }
1049
1050 static void crypto_rfc4106_free(struct crypto_instance *inst)
1051 {
1052         crypto_drop_spawn(crypto_instance_ctx(inst));
1053         kfree(inst);
1054 }
1055
1056 static struct crypto_template crypto_rfc4106_tmpl = {
1057         .name = "rfc4106",
1058         .alloc = crypto_rfc4106_alloc,
1059         .free = crypto_rfc4106_free,
1060         .module = THIS_MODULE,
1061 };
1062
1063 static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1064         struct aead_request *req)
1065 {
1066         unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1067
1068         return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1069 }
1070
1071 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1072                                  unsigned int keylen)
1073 {
1074         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1075         struct crypto_aead *child = ctx->child;
1076         int err;
1077
1078         if (keylen < 4)
1079                 return -EINVAL;
1080
1081         keylen -= 4;
1082         memcpy(ctx->nonce, key + keylen, 4);
1083
1084         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1085         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1086                                      CRYPTO_TFM_REQ_MASK);
1087         err = crypto_aead_setkey(child, key, keylen);
1088         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1089                                       CRYPTO_TFM_RES_MASK);
1090
1091         return err;
1092 }
1093
1094 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1095                                       unsigned int authsize)
1096 {
1097         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1098
1099         if (authsize != 16)
1100                 return -EINVAL;
1101
1102         return crypto_aead_setauthsize(ctx->child, authsize);
1103 }
1104
1105 static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
1106 {
1107         struct aead_request *req = areq->data;
1108         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1109         struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1110
1111         if (!err) {
1112                 scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
1113                                          req->cryptlen,
1114                                          crypto_aead_authsize(aead), 1);
1115         }
1116
1117         aead_request_complete(req, err);
1118 }
1119
1120 static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1121                                                  bool enc)
1122 {
1123         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1124         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1125         struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1126         struct aead_request *subreq = &rctx->subreq;
1127         struct scatterlist *src = req->src;
1128         struct scatterlist *cipher = rctx->cipher;
1129         struct scatterlist *payload = rctx->payload;
1130         struct scatterlist *assoc = rctx->assoc;
1131         unsigned int authsize = crypto_aead_authsize(aead);
1132         unsigned int assoclen = req->assoclen;
1133         struct page *srcp;
1134         u8 *vsrc;
1135         u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1136                            crypto_aead_alignmask(ctx->child) + 1);
1137
1138         memcpy(iv, ctx->nonce, 4);
1139         memcpy(iv + 4, req->iv, 8);
1140
1141         /* construct cipher/plaintext */
1142         if (enc)
1143                 memset(rctx->auth_tag, 0, authsize);
1144         else
1145                 scatterwalk_map_and_copy(rctx->auth_tag, src,
1146                                          req->cryptlen - authsize,
1147                                          authsize, 0);
1148
1149         sg_init_one(cipher, rctx->auth_tag, authsize);
1150
1151         /* construct the aad */
1152         srcp = sg_page(src);
1153         vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
1154
1155         sg_init_table(payload, 2);
1156         sg_set_buf(payload, req->iv, 8);
1157         scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
1158         assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1159
1160         if (req->assoc->length == req->assoclen) {
1161                 sg_init_table(assoc, 2);
1162                 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1163                             req->assoc->offset);
1164         } else {
1165                 BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1166
1167                 scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1168                                          req->assoclen, 0);
1169
1170                 sg_init_table(assoc, 2);
1171                 sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1172         }
1173         scatterwalk_crypto_chain(assoc, payload, 0, 2);
1174
1175         aead_request_set_tfm(subreq, ctx->child);
1176         aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
1177                                   req);
1178         aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1179         aead_request_set_assoc(subreq, assoc, assoclen);
1180
1181         return subreq;
1182 }
1183
1184 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1185 {
1186         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1187         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1188         unsigned int authsize = crypto_aead_authsize(aead);
1189         unsigned int nbytes = req->cryptlen - (enc ? 0 : authsize);
1190         struct blkcipher_desc desc = {
1191                 .tfm = ctx->null,
1192         };
1193
1194         return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1195 }
1196
1197 static int crypto_rfc4543_encrypt(struct aead_request *req)
1198 {
1199         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1200         struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1201         struct aead_request *subreq;
1202         int err;
1203
1204         if (req->src != req->dst) {
1205                 err = crypto_rfc4543_copy_src_to_dst(req, true);
1206                 if (err)
1207                         return err;
1208         }
1209
1210         subreq = crypto_rfc4543_crypt(req, true);
1211         err = crypto_aead_encrypt(subreq);
1212         if (err)
1213                 return err;
1214
1215         scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1216                                  crypto_aead_authsize(aead), 1);
1217
1218         return 0;
1219 }
1220
1221 static int crypto_rfc4543_decrypt(struct aead_request *req)
1222 {
1223         int err;
1224
1225         if (req->src != req->dst) {
1226                 err = crypto_rfc4543_copy_src_to_dst(req, false);
1227                 if (err)
1228                         return err;
1229         }
1230
1231         req = crypto_rfc4543_crypt(req, false);
1232
1233         return crypto_aead_decrypt(req);
1234 }
1235
1236 static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1237 {
1238         struct crypto_instance *inst = (void *)tfm->__crt_alg;
1239         struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst);
1240         struct crypto_aead_spawn *spawn = &ictx->aead;
1241         struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1242         struct crypto_aead *aead;
1243         struct crypto_blkcipher *null;
1244         unsigned long align;
1245         int err = 0;
1246
1247         aead = crypto_spawn_aead(spawn);
1248         if (IS_ERR(aead))
1249                 return PTR_ERR(aead);
1250
1251         null = crypto_spawn_blkcipher(&ictx->null.base);
1252         err = PTR_ERR(null);
1253         if (IS_ERR(null))
1254                 goto err_free_aead;
1255
1256         ctx->child = aead;
1257         ctx->null = null;
1258
1259         align = crypto_aead_alignmask(aead);
1260         align &= ~(crypto_tfm_ctx_alignment() - 1);
1261         tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1262                                 ALIGN(crypto_aead_reqsize(aead),
1263                                       crypto_tfm_ctx_alignment()) +
1264                                 align + 16;
1265
1266         return 0;
1267
1268 err_free_aead:
1269         crypto_free_aead(aead);
1270         return err;
1271 }
1272
1273 static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1274 {
1275         struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1276
1277         crypto_free_aead(ctx->child);
1278         crypto_free_blkcipher(ctx->null);
1279 }
1280
1281 static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1282 {
1283         struct crypto_attr_type *algt;
1284         struct crypto_instance *inst;
1285         struct crypto_aead_spawn *spawn;
1286         struct crypto_alg *alg;
1287         struct crypto_rfc4543_instance_ctx *ctx;
1288         const char *ccm_name;
1289         int err;
1290
1291         algt = crypto_get_attr_type(tb);
1292         if (IS_ERR(algt))
1293                 return ERR_CAST(algt);
1294
1295         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1296                 return ERR_PTR(-EINVAL);
1297
1298         ccm_name = crypto_attr_alg_name(tb[1]);
1299         if (IS_ERR(ccm_name))
1300                 return ERR_CAST(ccm_name);
1301
1302         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1303         if (!inst)
1304                 return ERR_PTR(-ENOMEM);
1305
1306         ctx = crypto_instance_ctx(inst);
1307         spawn = &ctx->aead;
1308         crypto_set_aead_spawn(spawn, inst);
1309         err = crypto_grab_aead(spawn, ccm_name, 0,
1310                                crypto_requires_sync(algt->type, algt->mask));
1311         if (err)
1312                 goto out_free_inst;
1313
1314         alg = crypto_aead_spawn_alg(spawn);
1315
1316         crypto_set_skcipher_spawn(&ctx->null, inst);
1317         err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0,
1318                                    CRYPTO_ALG_ASYNC);
1319         if (err)
1320                 goto out_drop_alg;
1321
1322         crypto_skcipher_spawn_alg(&ctx->null);
1323
1324         err = -EINVAL;
1325
1326         /* We only support 16-byte blocks. */
1327         if (alg->cra_aead.ivsize != 16)
1328                 goto out_drop_ecbnull;
1329
1330         /* Not a stream cipher? */
1331         if (alg->cra_blocksize != 1)
1332                 goto out_drop_ecbnull;
1333
1334         err = -ENAMETOOLONG;
1335         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1336                      "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1337             snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1338                      "rfc4543(%s)", alg->cra_driver_name) >=
1339             CRYPTO_MAX_ALG_NAME)
1340                 goto out_drop_ecbnull;
1341
1342         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1343         inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1344         inst->alg.cra_priority = alg->cra_priority;
1345         inst->alg.cra_blocksize = 1;
1346         inst->alg.cra_alignmask = alg->cra_alignmask;
1347         inst->alg.cra_type = &crypto_nivaead_type;
1348
1349         inst->alg.cra_aead.ivsize = 8;
1350         inst->alg.cra_aead.maxauthsize = 16;
1351
1352         inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1353
1354         inst->alg.cra_init = crypto_rfc4543_init_tfm;
1355         inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1356
1357         inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1358         inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1359         inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1360         inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1361
1362         inst->alg.cra_aead.geniv = "seqiv";
1363
1364 out:
1365         return inst;
1366
1367 out_drop_ecbnull:
1368         crypto_drop_skcipher(&ctx->null);
1369 out_drop_alg:
1370         crypto_drop_aead(spawn);
1371 out_free_inst:
1372         kfree(inst);
1373         inst = ERR_PTR(err);
1374         goto out;
1375 }
1376
1377 static void crypto_rfc4543_free(struct crypto_instance *inst)
1378 {
1379         struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst);
1380
1381         crypto_drop_aead(&ctx->aead);
1382         crypto_drop_skcipher(&ctx->null);
1383
1384         kfree(inst);
1385 }
1386
1387 static struct crypto_template crypto_rfc4543_tmpl = {
1388         .name = "rfc4543",
1389         .alloc = crypto_rfc4543_alloc,
1390         .free = crypto_rfc4543_free,
1391         .module = THIS_MODULE,
1392 };
1393
1394 static int __init crypto_gcm_module_init(void)
1395 {
1396         int err;
1397
1398         gcm_zeroes = kzalloc(16, GFP_KERNEL);
1399         if (!gcm_zeroes)
1400                 return -ENOMEM;
1401
1402         err = crypto_register_template(&crypto_gcm_base_tmpl);
1403         if (err)
1404                 goto out;
1405
1406         err = crypto_register_template(&crypto_gcm_tmpl);
1407         if (err)
1408                 goto out_undo_base;
1409
1410         err = crypto_register_template(&crypto_rfc4106_tmpl);
1411         if (err)
1412                 goto out_undo_gcm;
1413
1414         err = crypto_register_template(&crypto_rfc4543_tmpl);
1415         if (err)
1416                 goto out_undo_rfc4106;
1417
1418         return 0;
1419
1420 out_undo_rfc4106:
1421         crypto_unregister_template(&crypto_rfc4106_tmpl);
1422 out_undo_gcm:
1423         crypto_unregister_template(&crypto_gcm_tmpl);
1424 out_undo_base:
1425         crypto_unregister_template(&crypto_gcm_base_tmpl);
1426 out:
1427         kfree(gcm_zeroes);
1428         return err;
1429 }
1430
1431 static void __exit crypto_gcm_module_exit(void)
1432 {
1433         kfree(gcm_zeroes);
1434         crypto_unregister_template(&crypto_rfc4543_tmpl);
1435         crypto_unregister_template(&crypto_rfc4106_tmpl);
1436         crypto_unregister_template(&crypto_gcm_tmpl);
1437         crypto_unregister_template(&crypto_gcm_base_tmpl);
1438 }
1439
1440 module_init(crypto_gcm_module_init);
1441 module_exit(crypto_gcm_module_exit);
1442
1443 MODULE_LICENSE("GPL");
1444 MODULE_DESCRIPTION("Galois/Counter Mode");
1445 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1446 MODULE_ALIAS_CRYPTO("gcm_base");
1447 MODULE_ALIAS_CRYPTO("rfc4106");
1448 MODULE_ALIAS_CRYPTO("rfc4543");
1449 MODULE_ALIAS_CRYPTO("gcm");