linux/crypto/gcm.c
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   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
  25struct gcm_instance_ctx {
  26        struct crypto_skcipher_spawn ctr;
  27        struct crypto_ahash_spawn ghash;
  28};
  29
  30struct crypto_gcm_ctx {
  31        struct crypto_ablkcipher *ctr;
  32        struct crypto_ahash *ghash;
  33};
  34
  35struct crypto_rfc4106_ctx {
  36        struct crypto_aead *child;
  37        u8 nonce[4];
  38};
  39
  40struct crypto_rfc4543_ctx {
  41        struct crypto_aead *child;
  42        u8 nonce[4];
  43};
  44
  45struct 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
  53struct crypto_gcm_ghash_ctx {
  54        unsigned int cryptlen;
  55        struct scatterlist *src;
  56        void (*complete)(struct aead_request *req, int err);
  57};
  58
  59struct 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
  71struct crypto_gcm_setkey_result {
  72        int err;
  73        struct completion completion;
  74};
  75
  76static void *gcm_zeroes;
  77
  78static 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
  86static 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
  97static 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
 158out:
 159        kfree(data);
 160        return err;
 161}
 162
 163static 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
 182static 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
 213static inline unsigned int gcm_remain(unsigned int len)
 214{
 215        len &= 0xfU;
 216        return len ? 16 - len : 0;
 217}
 218
 219static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
 220static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
 221
 222static 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
 237static 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
 252static 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
 271static 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
 283static 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
 294static 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
 301static 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
 314static 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
 321static 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
 334static 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
 342static 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
 360static 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
 367static 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
 390static 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
 398static 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
 415static 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
 422static 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
 444static 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
 451static 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
 500static 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
 510static 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
 520static 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
 538static 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
 567static 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
 581static 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
 592static 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
 612static 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
 644static 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
 677err_free_hash:
 678        crypto_free_ahash(ghash);
 679        return err;
 680}
 681
 682static 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
 690static 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
 773out:
 774        crypto_mod_put(ghash_alg);
 775        return inst;
 776
 777out_put_ctr:
 778        crypto_drop_skcipher(&ctx->ctr);
 779err_drop_ghash:
 780        crypto_drop_ahash(&ctx->ghash);
 781err_free_inst:
 782        kfree(inst);
 783out_put_ghash:
 784        inst = ERR_PTR(err);
 785        goto out;
 786}
 787
 788static 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
 811static 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
 820static 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
 827static 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
 851static 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
 858static 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
 881static 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
 898static 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
 919static int crypto_rfc4106_encrypt(struct aead_request *req)
 920{
 921        req = crypto_rfc4106_crypt(req);
 922
 923        return crypto_aead_encrypt(req);
 924}
 925
 926static int crypto_rfc4106_decrypt(struct aead_request *req)
 927{
 928        req = crypto_rfc4106_crypt(req);
 929
 930        return crypto_aead_decrypt(req);
 931}
 932
 933static 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
 957static 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
 964static 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
1039out:
1040        return inst;
1041
1042out_drop_alg:
1043        crypto_drop_aead(spawn);
1044out_free_inst:
1045        kfree(inst);
1046        inst = ERR_PTR(err);
1047        goto out;
1048}
1049
1050static void crypto_rfc4106_free(struct crypto_instance *inst)
1051{
1052        crypto_drop_spawn(crypto_instance_ctx(inst));
1053        kfree(inst);
1054}
1055
1056static 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
1063static 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
1071static 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
1094static 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
1105static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1106                                                 int enc)
1107{
1108        struct crypto_aead *aead = crypto_aead_reqtfm(req);
1109        struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1110        struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1111        struct aead_request *subreq = &rctx->subreq;
1112        struct scatterlist *dst = req->dst;
1113        struct scatterlist *cipher = rctx->cipher;
1114        struct scatterlist *payload = rctx->payload;
1115        struct scatterlist *assoc = rctx->assoc;
1116        unsigned int authsize = crypto_aead_authsize(aead);
1117        unsigned int assoclen = req->assoclen;
1118        struct page *dstp;
1119        u8 *vdst;
1120        u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1121                           crypto_aead_alignmask(ctx->child) + 1);
1122
1123        memcpy(iv, ctx->nonce, 4);
1124        memcpy(iv + 4, req->iv, 8);
1125
1126        /* construct cipher/plaintext */
1127        if (enc)
1128                memset(rctx->auth_tag, 0, authsize);
1129        else
1130                scatterwalk_map_and_copy(rctx->auth_tag, dst,
1131                                         req->cryptlen - authsize,
1132                                         authsize, 0);
1133
1134        sg_init_one(cipher, rctx->auth_tag, authsize);
1135
1136        /* construct the aad */
1137        dstp = sg_page(dst);
1138        vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
1139
1140        sg_init_table(payload, 2);
1141        sg_set_buf(payload, req->iv, 8);
1142        scatterwalk_crypto_chain(payload, dst, vdst == req->iv + 8, 2);
1143        assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1144
1145        sg_init_table(assoc, 2);
1146        sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1147                    req->assoc->offset);
1148        scatterwalk_crypto_chain(assoc, payload, 0, 2);
1149
1150        aead_request_set_tfm(subreq, ctx->child);
1151        aead_request_set_callback(subreq, req->base.flags, req->base.complete,
1152                                  req->base.data);
1153        aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1154        aead_request_set_assoc(subreq, assoc, assoclen);
1155
1156        return subreq;
1157}
1158
1159static int crypto_rfc4543_encrypt(struct aead_request *req)
1160{
1161        struct crypto_aead *aead = crypto_aead_reqtfm(req);
1162        struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1163        struct aead_request *subreq;
1164        int err;
1165
1166        subreq = crypto_rfc4543_crypt(req, 1);
1167        err = crypto_aead_encrypt(subreq);
1168        if (err)
1169                return err;
1170
1171        scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1172                                 crypto_aead_authsize(aead), 1);
1173
1174        return 0;
1175}
1176
1177static int crypto_rfc4543_decrypt(struct aead_request *req)
1178{
1179        req = crypto_rfc4543_crypt(req, 0);
1180
1181        return crypto_aead_decrypt(req);
1182}
1183
1184static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1185{
1186        struct crypto_instance *inst = (void *)tfm->__crt_alg;
1187        struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
1188        struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1189        struct crypto_aead *aead;
1190        unsigned long align;
1191
1192        aead = crypto_spawn_aead(spawn);
1193        if (IS_ERR(aead))
1194                return PTR_ERR(aead);
1195
1196        ctx->child = aead;
1197
1198        align = crypto_aead_alignmask(aead);
1199        align &= ~(crypto_tfm_ctx_alignment() - 1);
1200        tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1201                                ALIGN(crypto_aead_reqsize(aead),
1202                                      crypto_tfm_ctx_alignment()) +
1203                                align + 16;
1204
1205        return 0;
1206}
1207
1208static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1209{
1210        struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1211
1212        crypto_free_aead(ctx->child);
1213}
1214
1215static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1216{
1217        struct crypto_attr_type *algt;
1218        struct crypto_instance *inst;
1219        struct crypto_aead_spawn *spawn;
1220        struct crypto_alg *alg;
1221        const char *ccm_name;
1222        int err;
1223
1224        algt = crypto_get_attr_type(tb);
1225        err = PTR_ERR(algt);
1226        if (IS_ERR(algt))
1227                return ERR_PTR(err);
1228
1229        if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1230                return ERR_PTR(-EINVAL);
1231
1232        ccm_name = crypto_attr_alg_name(tb[1]);
1233        err = PTR_ERR(ccm_name);
1234        if (IS_ERR(ccm_name))
1235                return ERR_PTR(err);
1236
1237        inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
1238        if (!inst)
1239                return ERR_PTR(-ENOMEM);
1240
1241        spawn = crypto_instance_ctx(inst);
1242        crypto_set_aead_spawn(spawn, inst);
1243        err = crypto_grab_aead(spawn, ccm_name, 0,
1244                               crypto_requires_sync(algt->type, algt->mask));
1245        if (err)
1246                goto out_free_inst;
1247
1248        alg = crypto_aead_spawn_alg(spawn);
1249
1250        err = -EINVAL;
1251
1252        /* We only support 16-byte blocks. */
1253        if (alg->cra_aead.ivsize != 16)
1254                goto out_drop_alg;
1255
1256        /* Not a stream cipher? */
1257        if (alg->cra_blocksize != 1)
1258                goto out_drop_alg;
1259
1260        err = -ENAMETOOLONG;
1261        if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1262                     "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1263            snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1264                     "rfc4543(%s)", alg->cra_driver_name) >=
1265            CRYPTO_MAX_ALG_NAME)
1266                goto out_drop_alg;
1267
1268        inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1269        inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1270        inst->alg.cra_priority = alg->cra_priority;
1271        inst->alg.cra_blocksize = 1;
1272        inst->alg.cra_alignmask = alg->cra_alignmask;
1273        inst->alg.cra_type = &crypto_nivaead_type;
1274
1275        inst->alg.cra_aead.ivsize = 8;
1276        inst->alg.cra_aead.maxauthsize = 16;
1277
1278        inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1279
1280        inst->alg.cra_init = crypto_rfc4543_init_tfm;
1281        inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1282
1283        inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1284        inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1285        inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1286        inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1287
1288        inst->alg.cra_aead.geniv = "seqiv";
1289
1290out:
1291        return inst;
1292
1293out_drop_alg:
1294        crypto_drop_aead(spawn);
1295out_free_inst:
1296        kfree(inst);
1297        inst = ERR_PTR(err);
1298        goto out;
1299}
1300
1301static void crypto_rfc4543_free(struct crypto_instance *inst)
1302{
1303        crypto_drop_spawn(crypto_instance_ctx(inst));
1304        kfree(inst);
1305}
1306
1307static struct crypto_template crypto_rfc4543_tmpl = {
1308        .name = "rfc4543",
1309        .alloc = crypto_rfc4543_alloc,
1310        .free = crypto_rfc4543_free,
1311        .module = THIS_MODULE,
1312};
1313
1314static int __init crypto_gcm_module_init(void)
1315{
1316        int err;
1317
1318        gcm_zeroes = kzalloc(16, GFP_KERNEL);
1319        if (!gcm_zeroes)
1320                return -ENOMEM;
1321
1322        err = crypto_register_template(&crypto_gcm_base_tmpl);
1323        if (err)
1324                goto out;
1325
1326        err = crypto_register_template(&crypto_gcm_tmpl);
1327        if (err)
1328                goto out_undo_base;
1329
1330        err = crypto_register_template(&crypto_rfc4106_tmpl);
1331        if (err)
1332                goto out_undo_gcm;
1333
1334        err = crypto_register_template(&crypto_rfc4543_tmpl);
1335        if (err)
1336                goto out_undo_rfc4106;
1337
1338        return 0;
1339
1340out_undo_rfc4106:
1341        crypto_unregister_template(&crypto_rfc4106_tmpl);
1342out_undo_gcm:
1343        crypto_unregister_template(&crypto_gcm_tmpl);
1344out_undo_base:
1345        crypto_unregister_template(&crypto_gcm_base_tmpl);
1346out:
1347        kfree(gcm_zeroes);
1348        return err;
1349}
1350
1351static void __exit crypto_gcm_module_exit(void)
1352{
1353        kfree(gcm_zeroes);
1354        crypto_unregister_template(&crypto_rfc4543_tmpl);
1355        crypto_unregister_template(&crypto_rfc4106_tmpl);
1356        crypto_unregister_template(&crypto_gcm_tmpl);
1357        crypto_unregister_template(&crypto_gcm_base_tmpl);
1358}
1359
1360module_init(crypto_gcm_module_init);
1361module_exit(crypto_gcm_module_exit);
1362
1363MODULE_LICENSE("GPL");
1364MODULE_DESCRIPTION("Galois/Counter Mode");
1365MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1366MODULE_ALIAS("gcm_base");
1367MODULE_ALIAS("rfc4106");
1368MODULE_ALIAS("rfc4543");
1369
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