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_ctx {
  41         struct crypto_aead *child;
  42         u8 nonce[4];
  43 };
  44
  45 struct crypto_rfc4543_req_ctx {
  46         u8 auth_tag[16];
  47         struct scatterlist cipher[1];
  48         struct scatterlist payload[2];
  49         struct scatterlist assoc[2];
  50         struct aead_request subreq;
  51 };
  52
  53 struct crypto_gcm_ghash_ctx {
  54         unsigned int cryptlen;
  55         struct scatterlist *src;
  56         void (*complete)(struct aead_request *req, int err);
  57 };
  58
  59 struct crypto_gcm_req_priv_ctx {
  60         u8 auth_tag[16];
  61         u8 iauth_tag[16];
  62         struct scatterlist src[2];
  63         struct scatterlist dst[2];
  64         struct crypto_gcm_ghash_ctx ghash_ctx;
  65         union {
  66                 struct ahash_request ahreq;
  67                 struct ablkcipher_request abreq;
  68         } u;
  69 };
  70
  71 struct crypto_gcm_setkey_result {
  72         int err;
  73         struct completion completion;
  74 };
  75
  76 static void *gcm_zeroes;
  77
  78 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
  79         struct aead_request *req)
  80 {
  81         unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
  82
  83         return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
  84 }
  85
  86 static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
  87 {
  88         struct crypto_gcm_setkey_result *result = req->data;
  89
  90         if (err == -EINPROGRESS)
  91                 return;
  92
  93         result->err = err;
  94         complete(&result->completion);
  95 }
  96
  97 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
  98                              unsigned int keylen)
  99 {
 100         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 101         struct crypto_ahash *ghash = ctx->ghash;
 102         struct crypto_ablkcipher *ctr = ctx->ctr;
 103         struct {
 104                 be128 hash;
 105                 u8 iv[8];
 106
 107                 struct crypto_gcm_setkey_result result;
 108
 109                 struct scatterlist sg[1];
 110                 struct ablkcipher_request req;
 111         } *data;
 112         int err;
 113
 114         crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
 115         crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
 116                                    CRYPTO_TFM_REQ_MASK);
 117
 118         err = crypto_ablkcipher_setkey(ctr, key, keylen);
 119         if (err)
 120                 return err;
 121
 122         crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
 123                                        CRYPTO_TFM_RES_MASK);
 124
 125         data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
 126                        GFP_KERNEL);
 127         if (!data)
 128                 return -ENOMEM;
 129
 130         init_completion(&data->result.completion);
 131         sg_init_one(data->sg, &data->hash, sizeof(data->hash));
 132         ablkcipher_request_set_tfm(&data->req, ctr);
 133         ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
 134                                                     CRYPTO_TFM_REQ_MAY_BACKLOG,
 135                                         crypto_gcm_setkey_done,
 136                                         &data->result);
 137         ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
 138                                      sizeof(data->hash), data->iv);
 139
 140         err = crypto_ablkcipher_encrypt(&data->req);
 141         if (err == -EINPROGRESS || err == -EBUSY) {
 142                 err = wait_for_completion_interruptible(
 143                         &data->result.completion);
 144                 if (!err)
 145                         err = data->result.err;
 146         }
 147
 148         if (err)
 149                 goto out;
 150
 151         crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
 152         crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
 153                                CRYPTO_TFM_REQ_MASK);
 154         err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
 155         crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
 156                               CRYPTO_TFM_RES_MASK);
 157
 158 out:
 159         kfree(data);
 160         return err;
 161 }
 162
 163 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
 164                                   unsigned int authsize)
 165 {
 166         switch (authsize) {
 167         case 4:
 168         case 8:
 169         case 12:
 170         case 13:
 171         case 14:
 172         case 15:
 173         case 16:
 174                 break;
 175         default:
 176                 return -EINVAL;
 177         }
 178
 179         return 0;
 180 }
 181
 182 static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
 183                                   struct aead_request *req,
 184                                   unsigned int cryptlen)
 185 {
 186         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 187         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
 188         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 189         struct scatterlist *dst;
 190         __be32 counter = cpu_to_be32(1);
 191
 192         memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
 193         memcpy(req->iv + 12, &counter, 4);
 194
 195         sg_init_table(pctx->src, 2);
 196         sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
 197         scatterwalk_sg_chain(pctx->src, 2, req->src);
 198
 199         dst = pctx->src;
 200         if (req->src != req->dst) {
 201                 sg_init_table(pctx->dst, 2);
 202                 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
 203                 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
 204                 dst = pctx->dst;
 205         }
 206
 207         ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
 208         ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
 209                                      cryptlen + sizeof(pctx->auth_tag),
 210                                      req->iv);
 211 }
 212
 213 static inline unsigned int gcm_remain(unsigned int len)
 214 {
 215         len &= 0xfU;
 216         return len ? 16 - len : 0;
 217 }
 218
 219 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
 220 static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
 221
 222 static int gcm_hash_update(struct aead_request *req,
 223                            struct crypto_gcm_req_priv_ctx *pctx,
 224                            crypto_completion_t complete,
 225                            struct scatterlist *src,
 226                            unsigned int len)
 227 {
 228         struct ahash_request *ahreq = &pctx->u.ahreq;
 229
 230         ahash_request_set_callback(ahreq, aead_request_flags(req),
 231                                    complete, req);
 232         ahash_request_set_crypt(ahreq, src, NULL, len);
 233
 234         return crypto_ahash_update(ahreq);
 235 }
 236
 237 static int gcm_hash_remain(struct aead_request *req,
 238                            struct crypto_gcm_req_priv_ctx *pctx,
 239                            unsigned int remain,
 240                            crypto_completion_t complete)
 241 {
 242         struct ahash_request *ahreq = &pctx->u.ahreq;
 243
 244         ahash_request_set_callback(ahreq, aead_request_flags(req),
 245                                    complete, req);
 246         sg_init_one(pctx->src, gcm_zeroes, remain);
 247         ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
 248
 249         return crypto_ahash_update(ahreq);
 250 }
 251
 252 static int gcm_hash_len(struct aead_request *req,
 253                         struct crypto_gcm_req_priv_ctx *pctx)
 254 {
 255         struct ahash_request *ahreq = &pctx->u.ahreq;
 256         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 257         u128 lengths;
 258
 259         lengths.a = cpu_to_be64(req->assoclen * 8);
 260         lengths.b = cpu_to_be64(gctx->cryptlen * 8);
 261         memcpy(pctx->iauth_tag, &lengths, 16);
 262         sg_init_one(pctx->src, pctx->iauth_tag, 16);
 263         ahash_request_set_callback(ahreq, aead_request_flags(req),
 264                                    gcm_hash_len_done, req);
 265         ahash_request_set_crypt(ahreq, pctx->src,
 266                                 NULL, sizeof(lengths));
 267
 268         return crypto_ahash_update(ahreq);
 269 }
 270
 271 static int gcm_hash_final(struct aead_request *req,
 272                           struct crypto_gcm_req_priv_ctx *pctx)
 273 {
 274         struct ahash_request *ahreq = &pctx->u.ahreq;
 275
 276         ahash_request_set_callback(ahreq, aead_request_flags(req),
 277                                    gcm_hash_final_done, req);
 278         ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
 279
 280         return crypto_ahash_final(ahreq);
 281 }
 282
 283 static void __gcm_hash_final_done(struct aead_request *req, int err)
 284 {
 285         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 286         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 287
 288         if (!err)
 289                 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
 290
 291         gctx->complete(req, err);
 292 }
 293
 294 static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
 295 {
 296         struct aead_request *req = areq->data;
 297
 298         __gcm_hash_final_done(req, err);
 299 }
 300
 301 static void __gcm_hash_len_done(struct aead_request *req, int err)
 302 {
 303         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 304
 305         if (!err) {
 306                 err = gcm_hash_final(req, pctx);
 307                 if (err == -EINPROGRESS || err == -EBUSY)
 308                         return;
 309         }
 310
 311         __gcm_hash_final_done(req, err);
 312 }
 313
 314 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
 315 {
 316         struct aead_request *req = areq->data;
 317
 318         __gcm_hash_len_done(req, err);
 319 }
 320
 321 static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
 322 {
 323         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 324
 325         if (!err) {
 326                 err = gcm_hash_len(req, pctx);
 327                 if (err == -EINPROGRESS || err == -EBUSY)
 328                         return;
 329         }
 330
 331         __gcm_hash_len_done(req, err);
 332 }
 333
 334 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
 335                                        int err)
 336 {
 337         struct aead_request *req = areq->data;
 338
 339         __gcm_hash_crypt_remain_done(req, err);
 340 }
 341
 342 static void __gcm_hash_crypt_done(struct aead_request *req, int err)
 343 {
 344         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 345         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 346         unsigned int remain;
 347
 348         if (!err) {
 349                 remain = gcm_remain(gctx->cryptlen);
 350                 BUG_ON(!remain);
 351                 err = gcm_hash_remain(req, pctx, remain,
 352                                       gcm_hash_crypt_remain_done);
 353                 if (err == -EINPROGRESS || err == -EBUSY)
 354                         return;
 355         }
 356
 357         __gcm_hash_crypt_remain_done(req, err);
 358 }
 359
 360 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
 361 {
 362         struct aead_request *req = areq->data;
 363
 364         __gcm_hash_crypt_done(req, err);
 365 }
 366
 367 static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
 368 {
 369         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 370         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 371         crypto_completion_t complete;
 372         unsigned int remain = 0;
 373
 374         if (!err && gctx->cryptlen) {
 375                 remain = gcm_remain(gctx->cryptlen);
 376                 complete = remain ? gcm_hash_crypt_done :
 377                         gcm_hash_crypt_remain_done;
 378                 err = gcm_hash_update(req, pctx, complete,
 379                                       gctx->src, gctx->cryptlen);
 380                 if (err == -EINPROGRESS || err == -EBUSY)
 381                         return;
 382         }
 383
 384         if (remain)
 385                 __gcm_hash_crypt_done(req, err);
 386         else
 387                 __gcm_hash_crypt_remain_done(req, err);
 388 }
 389
 390 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
 391                                        int err)
 392 {
 393         struct aead_request *req = areq->data;
 394
 395         __gcm_hash_assoc_remain_done(req, err);
 396 }
 397
 398 static void __gcm_hash_assoc_done(struct aead_request *req, int err)
 399 {
 400         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 401         unsigned int remain;
 402
 403         if (!err) {
 404                 remain = gcm_remain(req->assoclen);
 405                 BUG_ON(!remain);
 406                 err = gcm_hash_remain(req, pctx, remain,
 407                                       gcm_hash_assoc_remain_done);
 408                 if (err == -EINPROGRESS || err == -EBUSY)
 409                         return;
 410         }
 411
 412         __gcm_hash_assoc_remain_done(req, err);
 413 }
 414
 415 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
 416 {
 417         struct aead_request *req = areq->data;
 418
 419         __gcm_hash_assoc_done(req, err);
 420 }
 421
 422 static void __gcm_hash_init_done(struct aead_request *req, int err)
 423 {
 424         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 425         crypto_completion_t complete;
 426         unsigned int remain = 0;
 427
 428         if (!err && req->assoclen) {
 429                 remain = gcm_remain(req->assoclen);
 430                 complete = remain ? gcm_hash_assoc_done :
 431                         gcm_hash_assoc_remain_done;
 432                 err = gcm_hash_update(req, pctx, complete,
 433                                       req->assoc, req->assoclen);
 434                 if (err == -EINPROGRESS || err == -EBUSY)
 435                         return;
 436         }
 437
 438         if (remain)
 439                 __gcm_hash_assoc_done(req, err);
 440         else
 441                 __gcm_hash_assoc_remain_done(req, err);
 442 }
 443
 444 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
 445 {
 446         struct aead_request *req = areq->data;
 447
 448         __gcm_hash_init_done(req, err);
 449 }
 450
 451 static int gcm_hash(struct aead_request *req,
 452                     struct crypto_gcm_req_priv_ctx *pctx)
 453 {
 454         struct ahash_request *ahreq = &pctx->u.ahreq;
 455         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 456         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 457         unsigned int remain;
 458         crypto_completion_t complete;
 459         int err;
 460
 461         ahash_request_set_tfm(ahreq, ctx->ghash);
 462
 463         ahash_request_set_callback(ahreq, aead_request_flags(req),
 464                                    gcm_hash_init_done, req);
 465         err = crypto_ahash_init(ahreq);
 466         if (err)
 467                 return err;
 468         remain = gcm_remain(req->assoclen);
 469         complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
 470         err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
 471         if (err)
 472                 return err;
 473         if (remain) {
 474                 err = gcm_hash_remain(req, pctx, remain,
 475                                       gcm_hash_assoc_remain_done);
 476                 if (err)
 477                         return err;
 478         }
 479         remain = gcm_remain(gctx->cryptlen);
 480         complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
 481         err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
 482         if (err)
 483                 return err;
 484         if (remain) {
 485                 err = gcm_hash_remain(req, pctx, remain,
 486                                       gcm_hash_crypt_remain_done);
 487                 if (err)
 488                         return err;
 489         }
 490         err = gcm_hash_len(req, pctx);
 491         if (err)
 492                 return err;
 493         err = gcm_hash_final(req, pctx);
 494         if (err)
 495                 return err;
 496
 497         return 0;
 498 }
 499
 500 static void gcm_enc_copy_hash(struct aead_request *req,
 501                               struct crypto_gcm_req_priv_ctx *pctx)
 502 {
 503         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 504         u8 *auth_tag = pctx->auth_tag;
 505
 506         scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
 507                                  crypto_aead_authsize(aead), 1);
 508 }
 509
 510 static void gcm_enc_hash_done(struct aead_request *req, int err)
 511 {
 512         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 513
 514         if (!err)
 515                 gcm_enc_copy_hash(req, pctx);
 516
 517         aead_request_complete(req, err);
 518 }
 519
 520 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
 521 {
 522         struct aead_request *req = areq->data;
 523         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 524
 525         if (!err) {
 526                 err = gcm_hash(req, pctx);
 527                 if (err == -EINPROGRESS || err == -EBUSY)
 528                         return;
 529                 else if (!err) {
 530                         crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
 531                         gcm_enc_copy_hash(req, pctx);
 532                 }
 533         }
 534
 535         aead_request_complete(req, err);
 536 }
 537
 538 static int crypto_gcm_encrypt(struct aead_request *req)
 539 {
 540         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 541         struct ablkcipher_request *abreq = &pctx->u.abreq;
 542         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 543         int err;
 544
 545         crypto_gcm_init_crypt(abreq, req, req->cryptlen);
 546         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
 547                                         gcm_encrypt_done, req);
 548
 549         gctx->src = req->dst;
 550         gctx->cryptlen = req->cryptlen;
 551         gctx->complete = gcm_enc_hash_done;
 552
 553         err = crypto_ablkcipher_encrypt(abreq);
 554         if (err)
 555                 return err;
 556
 557         err = gcm_hash(req, pctx);
 558         if (err)
 559                 return err;
 560
 561         crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
 562         gcm_enc_copy_hash(req, pctx);
 563
 564         return 0;
 565 }
 566
 567 static int crypto_gcm_verify(struct aead_request *req,
 568                              struct crypto_gcm_req_priv_ctx *pctx)
 569 {
 570         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 571         u8 *auth_tag = pctx->auth_tag;
 572         u8 *iauth_tag = pctx->iauth_tag;
 573         unsigned int authsize = crypto_aead_authsize(aead);
 574         unsigned int cryptlen = req->cryptlen - authsize;
 575
 576         crypto_xor(auth_tag, iauth_tag, 16);
 577         scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
 578         return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
 579 }
 580
 581 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
 582 {
 583         struct aead_request *req = areq->data;
 584         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 585
 586         if (!err)
 587                 err = crypto_gcm_verify(req, pctx);
 588
 589         aead_request_complete(req, err);
 590 }
 591
 592 static void gcm_dec_hash_done(struct aead_request *req, int err)
 593 {
 594         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 595         struct ablkcipher_request *abreq = &pctx->u.abreq;
 596         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 597
 598         if (!err) {
 599                 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
 600                                                 gcm_decrypt_done, req);
 601                 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
 602                 err = crypto_ablkcipher_decrypt(abreq);
 603                 if (err == -EINPROGRESS || err == -EBUSY)
 604                         return;
 605                 else if (!err)
 606                         err = crypto_gcm_verify(req, pctx);
 607         }
 608
 609         aead_request_complete(req, err);
 610 }
 611
 612 static int crypto_gcm_decrypt(struct aead_request *req)
 613 {
 614         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 615         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
 616         struct ablkcipher_request *abreq = &pctx->u.abreq;
 617         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
 618         unsigned int authsize = crypto_aead_authsize(aead);
 619         unsigned int cryptlen = req->cryptlen;
 620         int err;
 621
 622         if (cryptlen < authsize)
 623                 return -EINVAL;
 624         cryptlen -= authsize;
 625
 626         gctx->src = req->src;
 627         gctx->cryptlen = cryptlen;
 628         gctx->complete = gcm_dec_hash_done;
 629
 630         err = gcm_hash(req, pctx);
 631         if (err)
 632                 return err;
 633
 634         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
 635                                         gcm_decrypt_done, req);
 636         crypto_gcm_init_crypt(abreq, req, cryptlen);
 637         err = crypto_ablkcipher_decrypt(abreq);
 638         if (err)
 639                 return err;
 640
 641         return crypto_gcm_verify(req, pctx);
 642 }
 643
 644 static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
 645 {
 646         struct crypto_instance *inst = (void *)tfm->__crt_alg;
 647         struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
 648         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
 649         struct crypto_ablkcipher *ctr;
 650         struct crypto_ahash *ghash;
 651         unsigned long align;
 652         int err;
 653
 654         ghash = crypto_spawn_ahash(&ictx->ghash);
 655         if (IS_ERR(ghash))
 656                 return PTR_ERR(ghash);
 657
 658         ctr = crypto_spawn_skcipher(&ictx->ctr);
 659         err = PTR_ERR(ctr);
 660         if (IS_ERR(ctr))
 661                 goto err_free_hash;
 662
 663         ctx->ctr = ctr;
 664         ctx->ghash = ghash;
 665
 666         align = crypto_tfm_alg_alignmask(tfm);
 667         align &= ~(crypto_tfm_ctx_alignment() - 1);
 668         tfm->crt_aead.reqsize = align +
 669                 offsetof(struct crypto_gcm_req_priv_ctx, u) +
 670                 max(sizeof(struct ablkcipher_request) +
 671                     crypto_ablkcipher_reqsize(ctr),
 672                     sizeof(struct ahash_request) +
 673                     crypto_ahash_reqsize(ghash));
 674
 675         return 0;
 676
 677 err_free_hash:
 678         crypto_free_ahash(ghash);
 679         return err;
 680 }
 681
 682 static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
 683 {
 684         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
 685
 686         crypto_free_ahash(ctx->ghash);
 687         crypto_free_ablkcipher(ctx->ctr);
 688 }
 689
 690 static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
 691                                                        const char *full_name,
 692                                                        const char *ctr_name,
 693                                                        const char *ghash_name)
 694 {
 695         struct crypto_attr_type *algt;
 696         struct crypto_instance *inst;
 697         struct crypto_alg *ctr;
 698         struct crypto_alg *ghash_alg;
 699         struct ahash_alg *ghash_ahash_alg;
 700         struct gcm_instance_ctx *ctx;
 701         int err;
 702
 703         algt = crypto_get_attr_type(tb);
 704         err = PTR_ERR(algt);
 705         if (IS_ERR(algt))
 706                 return ERR_PTR(err);
 707
 708         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 709                 return ERR_PTR(-EINVAL);
 710
 711         ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
 712                                     CRYPTO_ALG_TYPE_HASH,
 713                                     CRYPTO_ALG_TYPE_AHASH_MASK);
 714         err = PTR_ERR(ghash_alg);
 715         if (IS_ERR(ghash_alg))
 716                 return ERR_PTR(err);
 717
 718         err = -ENOMEM;
 719         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 720         if (!inst)
 721                 goto out_put_ghash;
 722
 723         ctx = crypto_instance_ctx(inst);
 724         ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
 725         err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
 726                                       inst);
 727         if (err)
 728                 goto err_free_inst;
 729
 730         crypto_set_skcipher_spawn(&ctx->ctr, inst);
 731         err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
 732                                    crypto_requires_sync(algt->type,
 733                                                         algt->mask));
 734         if (err)
 735                 goto err_drop_ghash;
 736
 737         ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
 738
 739         /* We only support 16-byte blocks. */
 740         if (ctr->cra_ablkcipher.ivsize != 16)
 741                 goto out_put_ctr;
 742
 743         /* Not a stream cipher? */
 744         err = -EINVAL;
 745         if (ctr->cra_blocksize != 1)
 746                 goto out_put_ctr;
 747
 748         err = -ENAMETOOLONG;
 749         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 750                      "gcm_base(%s,%s)", ctr->cra_driver_name,
 751                      ghash_alg->cra_driver_name) >=
 752             CRYPTO_MAX_ALG_NAME)
 753                 goto out_put_ctr;
 754
 755         memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
 756
 757         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
 758         inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
 759         inst->alg.cra_priority = ctr->cra_priority;
 760         inst->alg.cra_blocksize = 1;
 761         inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
 762         inst->alg.cra_type = &crypto_aead_type;
 763         inst->alg.cra_aead.ivsize = 16;
 764         inst->alg.cra_aead.maxauthsize = 16;
 765         inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
 766         inst->alg.cra_init = crypto_gcm_init_tfm;
 767         inst->alg.cra_exit = crypto_gcm_exit_tfm;
 768         inst->alg.cra_aead.setkey = crypto_gcm_setkey;
 769         inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
 770         inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
 771         inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
 772
 773 out:
 774         crypto_mod_put(ghash_alg);
 775         return inst;
 776
 777 out_put_ctr:
 778         crypto_drop_skcipher(&ctx->ctr);
 779 err_drop_ghash:
 780         crypto_drop_ahash(&ctx->ghash);
 781 err_free_inst:
 782         kfree(inst);
 783 out_put_ghash:
 784         inst = ERR_PTR(err);
 785         goto out;
 786 }
 787
 788 static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
 789 {
 790         int err;
 791         const char *cipher_name;
 792         char ctr_name[CRYPTO_MAX_ALG_NAME];
 793         char full_name[CRYPTO_MAX_ALG_NAME];
 794
 795         cipher_name = crypto_attr_alg_name(tb[1]);
 796         err = PTR_ERR(cipher_name);
 797         if (IS_ERR(cipher_name))
 798                 return ERR_PTR(err);
 799
 800         if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
 801             CRYPTO_MAX_ALG_NAME)
 802                 return ERR_PTR(-ENAMETOOLONG);
 803
 804         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
 805             CRYPTO_MAX_ALG_NAME)
 806                 return ERR_PTR(-ENAMETOOLONG);
 807
 808         return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
 809 }
 810
 811 static void crypto_gcm_free(struct crypto_instance *inst)
 812 {
 813         struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
 814
 815         crypto_drop_skcipher(&ctx->ctr);
 816         crypto_drop_ahash(&ctx->ghash);
 817         kfree(inst);
 818 }
 819
 820 static struct crypto_template crypto_gcm_tmpl = {
 821         .name = "gcm",
 822         .alloc = crypto_gcm_alloc,
 823         .free = crypto_gcm_free,
 824         .module = THIS_MODULE,
 825 };
 826
 827 static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
 828 {
 829         int err;
 830         const char *ctr_name;
 831         const char *ghash_name;
 832         char full_name[CRYPTO_MAX_ALG_NAME];
 833
 834         ctr_name = crypto_attr_alg_name(tb[1]);
 835         err = PTR_ERR(ctr_name);
 836         if (IS_ERR(ctr_name))
 837                 return ERR_PTR(err);
 838
 839         ghash_name = crypto_attr_alg_name(tb[2]);
 840         err = PTR_ERR(ghash_name);
 841         if (IS_ERR(ghash_name))
 842                 return ERR_PTR(err);
 843
 844         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
 845                      ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
 846                 return ERR_PTR(-ENAMETOOLONG);
 847
 848         return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
 849 }
 850
 851 static struct crypto_template crypto_gcm_base_tmpl = {
 852         .name = "gcm_base",
 853         .alloc = crypto_gcm_base_alloc,
 854         .free = crypto_gcm_free,
 855         .module = THIS_MODULE,
 856 };
 857
 858 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
 859                                  unsigned int keylen)
 860 {
 861         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 862         struct crypto_aead *child = ctx->child;
 863         int err;
 864
 865         if (keylen < 4)
 866                 return -EINVAL;
 867
 868         keylen -= 4;
 869         memcpy(ctx->nonce, key + keylen, 4);
 870
 871         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 872         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
 873                                      CRYPTO_TFM_REQ_MASK);
 874         err = crypto_aead_setkey(child, key, keylen);
 875         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
 876                                       CRYPTO_TFM_RES_MASK);
 877
 878         return err;
 879 }
 880
 881 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
 882                                       unsigned int authsize)
 883 {
 884         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
 885
 886         switch (authsize) {
 887         case 8:
 888         case 12:
 889         case 16:
 890                 break;
 891         default:
 892                 return -EINVAL;
 893         }
 894
 895         return crypto_aead_setauthsize(ctx->child, authsize);
 896 }
 897
 898 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
 899 {
 900         struct aead_request *subreq = aead_request_ctx(req);
 901         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 902         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
 903         struct crypto_aead *child = ctx->child;
 904         u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
 905                            crypto_aead_alignmask(child) + 1);
 906
 907         memcpy(iv, ctx->nonce, 4);
 908         memcpy(iv + 4, req->iv, 8);
 909
 910         aead_request_set_tfm(subreq, child);
 911         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
 912                                   req->base.data);
 913         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
 914         aead_request_set_assoc(subreq, req->assoc, req->assoclen);
 915
 916         return subreq;
 917 }
 918
 919 static int crypto_rfc4106_encrypt(struct aead_request *req)
 920 {
 921         req = crypto_rfc4106_crypt(req);
 922
 923         return crypto_aead_encrypt(req);
 924 }
 925
 926 static int crypto_rfc4106_decrypt(struct aead_request *req)
 927 {
 928         req = crypto_rfc4106_crypt(req);
 929
 930         return crypto_aead_decrypt(req);
 931 }
 932
 933 static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
 934 {
 935         struct crypto_instance *inst = (void *)tfm->__crt_alg;
 936         struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
 937         struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
 938         struct crypto_aead *aead;
 939         unsigned long align;
 940
 941         aead = crypto_spawn_aead(spawn);
 942         if (IS_ERR(aead))
 943                 return PTR_ERR(aead);
 944
 945         ctx->child = aead;
 946
 947         align = crypto_aead_alignmask(aead);
 948         align &= ~(crypto_tfm_ctx_alignment() - 1);
 949         tfm->crt_aead.reqsize = sizeof(struct aead_request) +
 950                                 ALIGN(crypto_aead_reqsize(aead),
 951                                       crypto_tfm_ctx_alignment()) +
 952                                 align + 16;
 953
 954         return 0;
 955 }
 956
 957 static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
 958 {
 959         struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
 960
 961         crypto_free_aead(ctx->child);
 962 }
 963
 964 static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
 965 {
 966         struct crypto_attr_type *algt;
 967         struct crypto_instance *inst;
 968         struct crypto_aead_spawn *spawn;
 969         struct crypto_alg *alg;
 970         const char *ccm_name;
 971         int err;
 972
 973         algt = crypto_get_attr_type(tb);
 974         err = PTR_ERR(algt);
 975         if (IS_ERR(algt))
 976                 return ERR_PTR(err);
 977
 978         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 979                 return ERR_PTR(-EINVAL);
 980
 981         ccm_name = crypto_attr_alg_name(tb[1]);
 982         err = PTR_ERR(ccm_name);
 983         if (IS_ERR(ccm_name))
 984                 return ERR_PTR(err);
 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 /* this is the same as crypto_authenc_chain */
1106 static void crypto_rfc4543_chain(struct scatterlist *head,
1107                                  struct scatterlist *sg, int chain)
1108 {
1109         if (chain) {
1110                 head->length += sg->length;
1111                 sg = scatterwalk_sg_next(sg);
1112         }
1113
1114         if (sg)
1115                 scatterwalk_sg_chain(head, 2, sg);
1116         else
1117                 sg_mark_end(head);
1118 }
1119
1120 static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1121                                                  int 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 *dst = req->dst;
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 *dstp;
1134         u8 *vdst;
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, dst,
1146                                          req->cryptlen - authsize,
1147                                          authsize, 0);
1148
1149         sg_init_one(cipher, rctx->auth_tag, authsize);
1150
1151         /* construct the aad */
1152         dstp = sg_page(dst);
1153         vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
1154
1155         sg_init_table(payload, 2);
1156         sg_set_buf(payload, req->iv, 8);
1157         crypto_rfc4543_chain(payload, dst, vdst == req->iv + 8);
1158         assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1159
1160         sg_init_table(assoc, 2);
1161         sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1162                     req->assoc->offset);
1163         crypto_rfc4543_chain(assoc, payload, 0);
1164
1165         aead_request_set_tfm(subreq, ctx->child);
1166         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
1167                                   req->base.data);
1168         aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1169         aead_request_set_assoc(subreq, assoc, assoclen);
1170
1171         return subreq;
1172 }
1173
1174 static int crypto_rfc4543_encrypt(struct aead_request *req)
1175 {
1176         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1177         struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1178         struct aead_request *subreq;
1179         int err;
1180
1181         subreq = crypto_rfc4543_crypt(req, 1);
1182         err = crypto_aead_encrypt(subreq);
1183         if (err)
1184                 return err;
1185
1186         scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1187                                  crypto_aead_authsize(aead), 1);
1188
1189         return 0;
1190 }
1191
1192 static int crypto_rfc4543_decrypt(struct aead_request *req)
1193 {
1194         req = crypto_rfc4543_crypt(req, 0);
1195
1196         return crypto_aead_decrypt(req);
1197 }
1198
1199 static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1200 {
1201         struct crypto_instance *inst = (void *)tfm->__crt_alg;
1202         struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
1203         struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1204         struct crypto_aead *aead;
1205         unsigned long align;
1206
1207         aead = crypto_spawn_aead(spawn);
1208         if (IS_ERR(aead))
1209                 return PTR_ERR(aead);
1210
1211         ctx->child = aead;
1212
1213         align = crypto_aead_alignmask(aead);
1214         align &= ~(crypto_tfm_ctx_alignment() - 1);
1215         tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1216                                 ALIGN(crypto_aead_reqsize(aead),
1217                                       crypto_tfm_ctx_alignment()) +
1218                                 align + 16;
1219
1220         return 0;
1221 }
1222
1223 static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1224 {
1225         struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1226
1227         crypto_free_aead(ctx->child);
1228 }
1229
1230 static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1231 {
1232         struct crypto_attr_type *algt;
1233         struct crypto_instance *inst;
1234         struct crypto_aead_spawn *spawn;
1235         struct crypto_alg *alg;
1236         const char *ccm_name;
1237         int err;
1238
1239         algt = crypto_get_attr_type(tb);
1240         err = PTR_ERR(algt);
1241         if (IS_ERR(algt))
1242                 return ERR_PTR(err);
1243
1244         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1245                 return ERR_PTR(-EINVAL);
1246
1247         ccm_name = crypto_attr_alg_name(tb[1]);
1248         err = PTR_ERR(ccm_name);
1249         if (IS_ERR(ccm_name))
1250                 return ERR_PTR(err);
1251
1252         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
1253         if (!inst)
1254                 return ERR_PTR(-ENOMEM);
1255
1256         spawn = crypto_instance_ctx(inst);
1257         crypto_set_aead_spawn(spawn, inst);
1258         err = crypto_grab_aead(spawn, ccm_name, 0,
1259                                crypto_requires_sync(algt->type, algt->mask));
1260         if (err)
1261                 goto out_free_inst;
1262
1263         alg = crypto_aead_spawn_alg(spawn);
1264
1265         err = -EINVAL;
1266
1267         /* We only support 16-byte blocks. */
1268         if (alg->cra_aead.ivsize != 16)
1269                 goto out_drop_alg;
1270
1271         /* Not a stream cipher? */
1272         if (alg->cra_blocksize != 1)
1273                 goto out_drop_alg;
1274
1275         err = -ENAMETOOLONG;
1276         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1277                      "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1278             snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1279                      "rfc4543(%s)", alg->cra_driver_name) >=
1280             CRYPTO_MAX_ALG_NAME)
1281                 goto out_drop_alg;
1282
1283         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1284         inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1285         inst->alg.cra_priority = alg->cra_priority;
1286         inst->alg.cra_blocksize = 1;
1287         inst->alg.cra_alignmask = alg->cra_alignmask;
1288         inst->alg.cra_type = &crypto_nivaead_type;
1289
1290         inst->alg.cra_aead.ivsize = 8;
1291         inst->alg.cra_aead.maxauthsize = 16;
1292
1293         inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1294
1295         inst->alg.cra_init = crypto_rfc4543_init_tfm;
1296         inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1297
1298         inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1299         inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1300         inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1301         inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1302
1303         inst->alg.cra_aead.geniv = "seqiv";
1304
1305 out:
1306         return inst;
1307
1308 out_drop_alg:
1309         crypto_drop_aead(spawn);
1310 out_free_inst:
1311         kfree(inst);
1312         inst = ERR_PTR(err);
1313         goto out;
1314 }
1315
1316 static void crypto_rfc4543_free(struct crypto_instance *inst)
1317 {
1318         crypto_drop_spawn(crypto_instance_ctx(inst));
1319         kfree(inst);
1320 }
1321
1322 static struct crypto_template crypto_rfc4543_tmpl = {
1323         .name = "rfc4543",
1324         .alloc = crypto_rfc4543_alloc,
1325         .free = crypto_rfc4543_free,
1326         .module = THIS_MODULE,
1327 };
1328
1329 static int __init crypto_gcm_module_init(void)
1330 {
1331         int err;
1332
1333         gcm_zeroes = kzalloc(16, GFP_KERNEL);
1334         if (!gcm_zeroes)
1335                 return -ENOMEM;
1336
1337         err = crypto_register_template(&crypto_gcm_base_tmpl);
1338         if (err)
1339                 goto out;
1340
1341         err = crypto_register_template(&crypto_gcm_tmpl);
1342         if (err)
1343                 goto out_undo_base;
1344
1345         err = crypto_register_template(&crypto_rfc4106_tmpl);
1346         if (err)
1347                 goto out_undo_gcm;
1348
1349         err = crypto_register_template(&crypto_rfc4543_tmpl);
1350         if (err)
1351                 goto out_undo_rfc4106;
1352
1353         return 0;
1354
1355 out_undo_rfc4106:
1356         crypto_unregister_template(&crypto_rfc4106_tmpl);
1357 out_undo_gcm:
1358         crypto_unregister_template(&crypto_gcm_tmpl);
1359 out_undo_base:
1360         crypto_unregister_template(&crypto_gcm_base_tmpl);
1361 out:
1362         kfree(gcm_zeroes);
1363         return err;
1364 }
1365
1366 static void __exit crypto_gcm_module_exit(void)
1367 {
1368         kfree(gcm_zeroes);
1369         crypto_unregister_template(&crypto_rfc4543_tmpl);
1370         crypto_unregister_template(&crypto_rfc4106_tmpl);
1371         crypto_unregister_template(&crypto_gcm_tmpl);
1372         crypto_unregister_template(&crypto_gcm_base_tmpl);
1373 }
1374
1375 module_init(crypto_gcm_module_init);
1376 module_exit(crypto_gcm_module_exit);
1377
1378 MODULE_LICENSE("GPL");
1379 MODULE_DESCRIPTION("Galois/Counter Mode");
1380 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1381 MODULE_ALIAS("gcm_base");
1382 MODULE_ALIAS("rfc4106");
1383 MODULE_ALIAS("rfc4543");