1 /* 2 * GCM: Galois/Counter Mode. 3 * 4 * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published 8 * by the Free Software Foundation. 9 */ 10 11 #include <crypto/gf128mul.h> 12 #include <crypto/internal/aead.h> 13 #include <crypto/internal/skcipher.h> 14 #include <crypto/internal/hash.h> 15 #include <crypto/scatterwalk.h> 16 #include <crypto/hash.h> 17 #include "internal.h" 18 #include <linux/completion.h> 19 #include <linux/err.h> 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/slab.h> 24 25 struct gcm_instance_ctx { 26 struct crypto_skcipher_spawn ctr; 27 struct crypto_ahash_spawn ghash; 28 }; 29 30 struct crypto_gcm_ctx { 31 struct crypto_ablkcipher *ctr; 32 struct crypto_ahash *ghash; 33 }; 34 35 struct crypto_rfc4106_ctx { 36 struct crypto_aead *child; 37 u8 nonce[4]; 38 }; 39 40 struct crypto_rfc4543_instance_ctx { 41 struct crypto_aead_spawn aead; 42 struct crypto_skcipher_spawn null; 43 }; 44 45 struct crypto_rfc4543_ctx { 46 struct crypto_aead *child; 47 struct crypto_blkcipher *null; 48 u8 nonce[4]; 49 }; 50 51 struct 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 60 struct crypto_gcm_ghash_ctx { 61 unsigned int cryptlen; 62 struct scatterlist *src; 63 void (*complete)(struct aead_request *req, int err); 64 }; 65 66 struct 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 78 struct crypto_gcm_setkey_result { 79 int err; 80 struct completion completion; 81 }; 82 83 static void *gcm_zeroes; 84 85 static 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 93 static 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 } 103 104 static 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); 164 165 out: 166 kfree(data); 167 return err; 168 } 169 170 static 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 } 188 189 static 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 } 219 220 static inline unsigned int gcm_remain(unsigned int len) 221 { 222 len &= 0xfU; 223 return len ? 16 - len : 0; 224 } 225 226 static void gcm_hash_len_done(struct crypto_async_request *areq, int err); 227 static void gcm_hash_final_done(struct crypto_async_request *areq, int err); 228 229 static int gcm_hash_update(struct aead_request *req, 230 struct crypto_gcm_req_priv_ctx *pctx, 231 crypto_completion_t compl, 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 compl, req); 239 ahash_request_set_crypt(ahreq, src, NULL, len); 240 241 return crypto_ahash_update(ahreq); 242 } 243 244 static int gcm_hash_remain(struct aead_request *req, 245 struct crypto_gcm_req_priv_ctx *pctx, 246 unsigned int remain, 247 crypto_completion_t compl) 248 { 249 struct ahash_request *ahreq = &pctx->u.ahreq; 250 251 ahash_request_set_callback(ahreq, aead_request_flags(req), 252 compl, 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 } 258 259 static 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 } 277 278 static 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 } 289 290 static 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 } 300 301 static 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 } 307 308 static 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 } 320 321 static 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 } 327 328 static 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 } 340 341 static 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 } 348 349 static 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 } 366 367 static 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 } 373 374 static 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 compl; 379 unsigned int remain = 0; 380 381 if (!err && gctx->cryptlen) { 382 remain = gcm_remain(gctx->cryptlen); 383 compl = remain ? gcm_hash_crypt_done : 384 gcm_hash_crypt_remain_done; 385 err = gcm_hash_update(req, pctx, compl, 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 } 396 397 static 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 } 404 405 static 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 } 421 422 static 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 } 428 429 static 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 compl; 433 unsigned int remain = 0; 434 435 if (!err && req->assoclen) { 436 remain = gcm_remain(req->assoclen); 437 compl = remain ? gcm_hash_assoc_done : 438 gcm_hash_assoc_remain_done; 439 err = gcm_hash_update(req, pctx, compl, 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 } 450 451 static 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 } 457 458 static 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 compl; 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 compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done; 477 err = gcm_hash_update(req, pctx, compl, 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 compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done; 488 err = gcm_hash_update(req, pctx, compl, 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 } 506 507 static 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 } 516 517 static 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 } 526 527 static 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 } 544 545 static 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 } 573 574 static 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 crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; 586 } 587 588 static 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 } 598 599 static 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 } 618 619 static 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 } 650 651 static 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; 683 684 err_free_hash: 685 crypto_free_ahash(ghash); 686 return err; 687 } 688 689 static 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 } 696 697 static 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; 777 778 out: 779 crypto_mod_put(ghash_alg); 780 return inst; 781 782 out_put_ctr: 783 crypto_drop_skcipher(&ctx->ctr); 784 err_drop_ghash: 785 crypto_drop_ahash(&ctx->ghash); 786 err_free_inst: 787 kfree(inst); 788 out_put_ghash: 789 inst = ERR_PTR(err); 790 goto out; 791 } 792 793 static 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 } 813 814 static 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 } 822 823 static struct crypto_template crypto_gcm_tmpl = { 824 .name = "gcm", 825 .alloc = crypto_gcm_alloc, 826 .free = crypto_gcm_free, 827 .module = THIS_MODULE, 828 }; 829 830 static 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 } 850 851 static struct crypto_template crypto_gcm_base_tmpl = { 852 .name = "gcm_base", 853 .alloc = crypto_gcm_base_alloc, 854 .free = crypto_gcm_free, 855 .module = THIS_MODULE, 856 }; 857 858 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, 859 unsigned int keylen) 860 { 861 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); 862 struct crypto_aead *child = ctx->child; 863 int err; 864 865 if (keylen < 4) 866 return -EINVAL; 867 868 keylen -= 4; 869 memcpy(ctx->nonce, key + keylen, 4); 870 871 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); 872 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & 873 CRYPTO_TFM_REQ_MASK); 874 err = crypto_aead_setkey(child, key, keylen); 875 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & 876 CRYPTO_TFM_RES_MASK); 877 878 return err; 879 } 880 881 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, 882 unsigned int authsize) 883 { 884 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); 885 886 switch (authsize) { 887 case 8: 888 case 12: 889 case 16: 890 break; 891 default: 892 return -EINVAL; 893 } 894 895 return crypto_aead_setauthsize(ctx->child, authsize); 896 } 897 898 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) 899 { 900 struct aead_request *subreq = aead_request_ctx(req); 901 struct crypto_aead *aead = crypto_aead_reqtfm(req); 902 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); 903 struct crypto_aead *child = ctx->child; 904 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), 905 crypto_aead_alignmask(child) + 1); 906 907 memcpy(iv, ctx->nonce, 4); 908 memcpy(iv + 4, req->iv, 8); 909 910 aead_request_set_tfm(subreq, child); 911 aead_request_set_callback(subreq, req->base.flags, req->base.complete, 912 req->base.data); 913 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv); 914 aead_request_set_assoc(subreq, req->assoc, req->assoclen); 915 916 return subreq; 917 } 918 919 static int crypto_rfc4106_encrypt(struct aead_request *req) 920 { 921 req = crypto_rfc4106_crypt(req); 922 923 return crypto_aead_encrypt(req); 924 } 925 926 static int crypto_rfc4106_decrypt(struct aead_request *req) 927 { 928 req = crypto_rfc4106_crypt(req); 929 930 return crypto_aead_decrypt(req); 931 } 932 933 static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm) 934 { 935 struct crypto_instance *inst = (void *)tfm->__crt_alg; 936 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst); 937 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); 938 struct crypto_aead *aead; 939 unsigned long align; 940 941 aead = crypto_spawn_aead(spawn); 942 if (IS_ERR(aead)) 943 return PTR_ERR(aead); 944 945 ctx->child = aead; 946 947 align = crypto_aead_alignmask(aead); 948 align &= ~(crypto_tfm_ctx_alignment() - 1); 949 tfm->crt_aead.reqsize = sizeof(struct aead_request) + 950 ALIGN(crypto_aead_reqsize(aead), 951 crypto_tfm_ctx_alignment()) + 952 align + 16; 953 954 return 0; 955 } 956 957 static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm) 958 { 959 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); 960 961 crypto_free_aead(ctx->child); 962 } 963 964 static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb) 965 { 966 struct crypto_attr_type *algt; 967 struct crypto_instance *inst; 968 struct crypto_aead_spawn *spawn; 969 struct crypto_alg *alg; 970 const char *ccm_name; 971 int err; 972 973 algt = crypto_get_attr_type(tb); 974 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 1037 out: 1038 return inst; 1039 1040 out_drop_alg: 1041 crypto_drop_aead(spawn); 1042 out_free_inst: 1043 kfree(inst); 1044 inst = ERR_PTR(err); 1045 goto out; 1046 } 1047 1048 static void crypto_rfc4106_free(struct crypto_instance *inst) 1049 { 1050 crypto_drop_spawn(crypto_instance_ctx(inst)); 1051 kfree(inst); 1052 } 1053 1054 static 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 1061 static 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 1069 static 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 1092 static 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 1103 static 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 1118 static 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 1182 static 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 1195 static 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 1219 static 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 1234 static 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 1266 err_free_aead: 1267 crypto_free_aead(aead); 1268 return err; 1269 } 1270 1271 static 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 1279 static 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 1362 out: 1363 return inst; 1364 1365 out_drop_ecbnull: 1366 crypto_drop_skcipher(&ctx->null); 1367 out_drop_alg: 1368 crypto_drop_aead(spawn); 1369 out_free_inst: 1370 kfree(inst); 1371 inst = ERR_PTR(err); 1372 goto out; 1373 } 1374 1375 static 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 1385 static 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 1392 static 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 1418 out_undo_rfc4106: 1419 crypto_unregister_template(&crypto_rfc4106_tmpl); 1420 out_undo_gcm: 1421 crypto_unregister_template(&crypto_gcm_tmpl); 1422 out_undo_base: 1423 crypto_unregister_template(&crypto_gcm_base_tmpl); 1424 out: 1425 kfree(gcm_zeroes); 1426 return err; 1427 } 1428 1429 static 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 1438 module_init(crypto_gcm_module_init); 1439 module_exit(crypto_gcm_module_exit); 1440 1441 MODULE_LICENSE("GPL"); 1442 MODULE_DESCRIPTION("Galois/Counter Mode"); 1443 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); 1444 MODULE_ALIAS_CRYPTO("gcm_base"); 1445 MODULE_ALIAS_CRYPTO("rfc4106"); 1446 MODULE_ALIAS_CRYPTO("rfc4543"); 1447 MODULE_ALIAS_CRYPTO("gcm"); 1448