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