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