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