1 /* 2 * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers, 3 * derived from authenc.c 4 * 5 * Copyright (C) 2010 secunet Security Networks AG 6 * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the Free 10 * Software Foundation; either version 2 of the License, or (at your option) 11 * any later version. 12 * 13 */ 14 15 #include <crypto/aead.h> 16 #include <crypto/internal/hash.h> 17 #include <crypto/internal/skcipher.h> 18 #include <crypto/authenc.h> 19 #include <crypto/scatterwalk.h> 20 #include <linux/err.h> 21 #include <linux/init.h> 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/rtnetlink.h> 25 #include <linux/slab.h> 26 #include <linux/spinlock.h> 27 28 struct authenc_esn_instance_ctx { 29 struct crypto_ahash_spawn auth; 30 struct crypto_skcipher_spawn enc; 31 }; 32 33 struct crypto_authenc_esn_ctx { 34 unsigned int reqoff; 35 struct crypto_ahash *auth; 36 struct crypto_ablkcipher *enc; 37 }; 38 39 struct authenc_esn_request_ctx { 40 unsigned int cryptlen; 41 unsigned int headlen; 42 unsigned int trailen; 43 struct scatterlist *sg; 44 struct scatterlist hsg[2]; 45 struct scatterlist tsg[1]; 46 struct scatterlist cipher[2]; 47 crypto_completion_t complete; 48 crypto_completion_t update_complete; 49 crypto_completion_t update_complete2; 50 char tail[]; 51 }; 52 53 static void authenc_esn_request_complete(struct aead_request *req, int err) 54 { 55 if (err != -EINPROGRESS) 56 aead_request_complete(req, err); 57 } 58 59 static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key, 60 unsigned int keylen) 61 { 62 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 63 struct crypto_ahash *auth = ctx->auth; 64 struct crypto_ablkcipher *enc = ctx->enc; 65 struct crypto_authenc_keys keys; 66 int err = -EINVAL; 67 68 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) 69 goto badkey; 70 71 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); 72 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) & 73 CRYPTO_TFM_REQ_MASK); 74 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); 75 crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) & 76 CRYPTO_TFM_RES_MASK); 77 78 if (err) 79 goto out; 80 81 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); 82 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) & 83 CRYPTO_TFM_REQ_MASK); 84 err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen); 85 crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) & 86 CRYPTO_TFM_RES_MASK); 87 88 out: 89 return err; 90 91 badkey: 92 crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN); 93 goto out; 94 } 95 96 static void authenc_esn_geniv_ahash_update_done(struct crypto_async_request *areq, 97 int err) 98 { 99 struct aead_request *req = areq->data; 100 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 101 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 102 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 103 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 104 105 if (err) 106 goto out; 107 108 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, 109 areq_ctx->cryptlen); 110 ahash_request_set_callback(ahreq, aead_request_flags(req) & 111 CRYPTO_TFM_REQ_MAY_SLEEP, 112 areq_ctx->update_complete2, req); 113 114 err = crypto_ahash_update(ahreq); 115 if (err) 116 goto out; 117 118 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, 119 areq_ctx->trailen); 120 ahash_request_set_callback(ahreq, aead_request_flags(req) & 121 CRYPTO_TFM_REQ_MAY_SLEEP, 122 areq_ctx->complete, req); 123 124 err = crypto_ahash_finup(ahreq); 125 if (err) 126 goto out; 127 128 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, 129 areq_ctx->cryptlen, 130 crypto_aead_authsize(authenc_esn), 1); 131 132 out: 133 authenc_esn_request_complete(req, err); 134 } 135 136 static void authenc_esn_geniv_ahash_update_done2(struct crypto_async_request *areq, 137 int err) 138 { 139 struct aead_request *req = areq->data; 140 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 141 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 142 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 143 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 144 145 if (err) 146 goto out; 147 148 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, 149 areq_ctx->trailen); 150 ahash_request_set_callback(ahreq, aead_request_flags(req) & 151 CRYPTO_TFM_REQ_MAY_SLEEP, 152 areq_ctx->complete, req); 153 154 err = crypto_ahash_finup(ahreq); 155 if (err) 156 goto out; 157 158 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, 159 areq_ctx->cryptlen, 160 crypto_aead_authsize(authenc_esn), 1); 161 162 out: 163 authenc_esn_request_complete(req, err); 164 } 165 166 167 static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq, 168 int err) 169 { 170 struct aead_request *req = areq->data; 171 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 172 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 173 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 174 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 175 176 if (err) 177 goto out; 178 179 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, 180 areq_ctx->cryptlen, 181 crypto_aead_authsize(authenc_esn), 1); 182 183 out: 184 aead_request_complete(req, err); 185 } 186 187 188 static void authenc_esn_verify_ahash_update_done(struct crypto_async_request *areq, 189 int err) 190 { 191 u8 *ihash; 192 unsigned int authsize; 193 struct ablkcipher_request *abreq; 194 struct aead_request *req = areq->data; 195 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 196 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 197 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 198 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 199 unsigned int cryptlen = req->cryptlen; 200 201 if (err) 202 goto out; 203 204 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, 205 areq_ctx->cryptlen); 206 207 ahash_request_set_callback(ahreq, 208 aead_request_flags(req) & 209 CRYPTO_TFM_REQ_MAY_SLEEP, 210 areq_ctx->update_complete2, req); 211 212 err = crypto_ahash_update(ahreq); 213 if (err) 214 goto out; 215 216 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, 217 areq_ctx->trailen); 218 ahash_request_set_callback(ahreq, aead_request_flags(req) & 219 CRYPTO_TFM_REQ_MAY_SLEEP, 220 areq_ctx->complete, req); 221 222 err = crypto_ahash_finup(ahreq); 223 if (err) 224 goto out; 225 226 authsize = crypto_aead_authsize(authenc_esn); 227 cryptlen -= authsize; 228 ihash = ahreq->result + authsize; 229 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 230 authsize, 0); 231 232 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; 233 if (err) 234 goto out; 235 236 abreq = aead_request_ctx(req); 237 ablkcipher_request_set_tfm(abreq, ctx->enc); 238 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 239 req->base.complete, req->base.data); 240 ablkcipher_request_set_crypt(abreq, req->src, req->dst, 241 cryptlen, req->iv); 242 243 err = crypto_ablkcipher_decrypt(abreq); 244 245 out: 246 authenc_esn_request_complete(req, err); 247 } 248 249 static void authenc_esn_verify_ahash_update_done2(struct crypto_async_request *areq, 250 int err) 251 { 252 u8 *ihash; 253 unsigned int authsize; 254 struct ablkcipher_request *abreq; 255 struct aead_request *req = areq->data; 256 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 257 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 258 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 259 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 260 unsigned int cryptlen = req->cryptlen; 261 262 if (err) 263 goto out; 264 265 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, 266 areq_ctx->trailen); 267 ahash_request_set_callback(ahreq, aead_request_flags(req) & 268 CRYPTO_TFM_REQ_MAY_SLEEP, 269 areq_ctx->complete, req); 270 271 err = crypto_ahash_finup(ahreq); 272 if (err) 273 goto out; 274 275 authsize = crypto_aead_authsize(authenc_esn); 276 cryptlen -= authsize; 277 ihash = ahreq->result + authsize; 278 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 279 authsize, 0); 280 281 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; 282 if (err) 283 goto out; 284 285 abreq = aead_request_ctx(req); 286 ablkcipher_request_set_tfm(abreq, ctx->enc); 287 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 288 req->base.complete, req->base.data); 289 ablkcipher_request_set_crypt(abreq, req->src, req->dst, 290 cryptlen, req->iv); 291 292 err = crypto_ablkcipher_decrypt(abreq); 293 294 out: 295 authenc_esn_request_complete(req, err); 296 } 297 298 299 static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq, 300 int err) 301 { 302 u8 *ihash; 303 unsigned int authsize; 304 struct ablkcipher_request *abreq; 305 struct aead_request *req = areq->data; 306 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 307 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 308 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 309 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 310 unsigned int cryptlen = req->cryptlen; 311 312 if (err) 313 goto out; 314 315 authsize = crypto_aead_authsize(authenc_esn); 316 cryptlen -= authsize; 317 ihash = ahreq->result + authsize; 318 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 319 authsize, 0); 320 321 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; 322 if (err) 323 goto out; 324 325 abreq = aead_request_ctx(req); 326 ablkcipher_request_set_tfm(abreq, ctx->enc); 327 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 328 req->base.complete, req->base.data); 329 ablkcipher_request_set_crypt(abreq, req->src, req->dst, 330 cryptlen, req->iv); 331 332 err = crypto_ablkcipher_decrypt(abreq); 333 334 out: 335 authenc_esn_request_complete(req, err); 336 } 337 338 static u8 *crypto_authenc_esn_ahash(struct aead_request *req, 339 unsigned int flags) 340 { 341 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 342 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 343 struct crypto_ahash *auth = ctx->auth; 344 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 345 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 346 u8 *hash = areq_ctx->tail; 347 int err; 348 349 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), 350 crypto_ahash_alignmask(auth) + 1); 351 352 ahash_request_set_tfm(ahreq, auth); 353 354 err = crypto_ahash_init(ahreq); 355 if (err) 356 return ERR_PTR(err); 357 358 ahash_request_set_crypt(ahreq, areq_ctx->hsg, hash, areq_ctx->headlen); 359 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 360 areq_ctx->update_complete, req); 361 362 err = crypto_ahash_update(ahreq); 363 if (err) 364 return ERR_PTR(err); 365 366 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, areq_ctx->cryptlen); 367 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 368 areq_ctx->update_complete2, req); 369 370 err = crypto_ahash_update(ahreq); 371 if (err) 372 return ERR_PTR(err); 373 374 ahash_request_set_crypt(ahreq, areq_ctx->tsg, hash, 375 areq_ctx->trailen); 376 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 377 areq_ctx->complete, req); 378 379 err = crypto_ahash_finup(ahreq); 380 if (err) 381 return ERR_PTR(err); 382 383 return hash; 384 } 385 386 static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv, 387 unsigned int flags) 388 { 389 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 390 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 391 struct scatterlist *dst = req->dst; 392 struct scatterlist *assoc = req->assoc; 393 struct scatterlist *cipher = areq_ctx->cipher; 394 struct scatterlist *hsg = areq_ctx->hsg; 395 struct scatterlist *tsg = areq_ctx->tsg; 396 struct scatterlist *assoc1; 397 struct scatterlist *assoc2; 398 unsigned int ivsize = crypto_aead_ivsize(authenc_esn); 399 unsigned int cryptlen = req->cryptlen; 400 struct page *dstp; 401 u8 *vdst; 402 u8 *hash; 403 404 dstp = sg_page(dst); 405 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; 406 407 if (ivsize) { 408 sg_init_table(cipher, 2); 409 sg_set_buf(cipher, iv, ivsize); 410 scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); 411 dst = cipher; 412 cryptlen += ivsize; 413 } 414 415 if (sg_is_last(assoc)) 416 return -EINVAL; 417 418 assoc1 = assoc + 1; 419 if (sg_is_last(assoc1)) 420 return -EINVAL; 421 422 assoc2 = assoc + 2; 423 if (!sg_is_last(assoc2)) 424 return -EINVAL; 425 426 sg_init_table(hsg, 2); 427 sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset); 428 sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset); 429 430 sg_init_table(tsg, 1); 431 sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset); 432 433 areq_ctx->cryptlen = cryptlen; 434 areq_ctx->headlen = assoc->length + assoc2->length; 435 areq_ctx->trailen = assoc1->length; 436 areq_ctx->sg = dst; 437 438 areq_ctx->complete = authenc_esn_geniv_ahash_done; 439 areq_ctx->update_complete = authenc_esn_geniv_ahash_update_done; 440 areq_ctx->update_complete2 = authenc_esn_geniv_ahash_update_done2; 441 442 hash = crypto_authenc_esn_ahash(req, flags); 443 if (IS_ERR(hash)) 444 return PTR_ERR(hash); 445 446 scatterwalk_map_and_copy(hash, dst, cryptlen, 447 crypto_aead_authsize(authenc_esn), 1); 448 return 0; 449 } 450 451 452 static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req, 453 int err) 454 { 455 struct aead_request *areq = req->data; 456 457 if (!err) { 458 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(areq); 459 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 460 struct ablkcipher_request *abreq = aead_request_ctx(areq); 461 u8 *iv = (u8 *)(abreq + 1) + 462 crypto_ablkcipher_reqsize(ctx->enc); 463 464 err = crypto_authenc_esn_genicv(areq, iv, 0); 465 } 466 467 authenc_esn_request_complete(areq, err); 468 } 469 470 static int crypto_authenc_esn_encrypt(struct aead_request *req) 471 { 472 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 473 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 474 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 475 struct crypto_ablkcipher *enc = ctx->enc; 476 struct scatterlist *dst = req->dst; 477 unsigned int cryptlen = req->cryptlen; 478 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail 479 + ctx->reqoff); 480 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); 481 int err; 482 483 ablkcipher_request_set_tfm(abreq, enc); 484 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 485 crypto_authenc_esn_encrypt_done, req); 486 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); 487 488 memcpy(iv, req->iv, crypto_aead_ivsize(authenc_esn)); 489 490 err = crypto_ablkcipher_encrypt(abreq); 491 if (err) 492 return err; 493 494 return crypto_authenc_esn_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); 495 } 496 497 static void crypto_authenc_esn_givencrypt_done(struct crypto_async_request *req, 498 int err) 499 { 500 struct aead_request *areq = req->data; 501 502 if (!err) { 503 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); 504 505 err = crypto_authenc_esn_genicv(areq, greq->giv, 0); 506 } 507 508 authenc_esn_request_complete(areq, err); 509 } 510 511 static int crypto_authenc_esn_givencrypt(struct aead_givcrypt_request *req) 512 { 513 struct crypto_aead *authenc_esn = aead_givcrypt_reqtfm(req); 514 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 515 struct aead_request *areq = &req->areq; 516 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); 517 u8 *iv = req->giv; 518 int err; 519 520 skcipher_givcrypt_set_tfm(greq, ctx->enc); 521 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), 522 crypto_authenc_esn_givencrypt_done, areq); 523 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, 524 areq->iv); 525 skcipher_givcrypt_set_giv(greq, iv, req->seq); 526 527 err = crypto_skcipher_givencrypt(greq); 528 if (err) 529 return err; 530 531 return crypto_authenc_esn_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); 532 } 533 534 static int crypto_authenc_esn_verify(struct aead_request *req) 535 { 536 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 537 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 538 u8 *ohash; 539 u8 *ihash; 540 unsigned int authsize; 541 542 areq_ctx->complete = authenc_esn_verify_ahash_done; 543 areq_ctx->update_complete = authenc_esn_verify_ahash_update_done; 544 545 ohash = crypto_authenc_esn_ahash(req, CRYPTO_TFM_REQ_MAY_SLEEP); 546 if (IS_ERR(ohash)) 547 return PTR_ERR(ohash); 548 549 authsize = crypto_aead_authsize(authenc_esn); 550 ihash = ohash + authsize; 551 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 552 authsize, 0); 553 return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0; 554 } 555 556 static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv, 557 unsigned int cryptlen) 558 { 559 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 560 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); 561 struct scatterlist *src = req->src; 562 struct scatterlist *assoc = req->assoc; 563 struct scatterlist *cipher = areq_ctx->cipher; 564 struct scatterlist *hsg = areq_ctx->hsg; 565 struct scatterlist *tsg = areq_ctx->tsg; 566 struct scatterlist *assoc1; 567 struct scatterlist *assoc2; 568 unsigned int ivsize = crypto_aead_ivsize(authenc_esn); 569 struct page *srcp; 570 u8 *vsrc; 571 572 srcp = sg_page(src); 573 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; 574 575 if (ivsize) { 576 sg_init_table(cipher, 2); 577 sg_set_buf(cipher, iv, ivsize); 578 scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); 579 src = cipher; 580 cryptlen += ivsize; 581 } 582 583 if (sg_is_last(assoc)) 584 return -EINVAL; 585 586 assoc1 = assoc + 1; 587 if (sg_is_last(assoc1)) 588 return -EINVAL; 589 590 assoc2 = assoc + 2; 591 if (!sg_is_last(assoc2)) 592 return -EINVAL; 593 594 sg_init_table(hsg, 2); 595 sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset); 596 sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset); 597 598 sg_init_table(tsg, 1); 599 sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset); 600 601 areq_ctx->cryptlen = cryptlen; 602 areq_ctx->headlen = assoc->length + assoc2->length; 603 areq_ctx->trailen = assoc1->length; 604 areq_ctx->sg = src; 605 606 areq_ctx->complete = authenc_esn_verify_ahash_done; 607 areq_ctx->update_complete = authenc_esn_verify_ahash_update_done; 608 areq_ctx->update_complete2 = authenc_esn_verify_ahash_update_done2; 609 610 return crypto_authenc_esn_verify(req); 611 } 612 613 static int crypto_authenc_esn_decrypt(struct aead_request *req) 614 { 615 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); 616 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); 617 struct ablkcipher_request *abreq = aead_request_ctx(req); 618 unsigned int cryptlen = req->cryptlen; 619 unsigned int authsize = crypto_aead_authsize(authenc_esn); 620 u8 *iv = req->iv; 621 int err; 622 623 if (cryptlen < authsize) 624 return -EINVAL; 625 cryptlen -= authsize; 626 627 err = crypto_authenc_esn_iverify(req, iv, cryptlen); 628 if (err) 629 return err; 630 631 ablkcipher_request_set_tfm(abreq, ctx->enc); 632 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 633 req->base.complete, req->base.data); 634 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); 635 636 return crypto_ablkcipher_decrypt(abreq); 637 } 638 639 static int crypto_authenc_esn_init_tfm(struct crypto_tfm *tfm) 640 { 641 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); 642 struct authenc_esn_instance_ctx *ictx = crypto_instance_ctx(inst); 643 struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm); 644 struct crypto_ahash *auth; 645 struct crypto_ablkcipher *enc; 646 int err; 647 648 auth = crypto_spawn_ahash(&ictx->auth); 649 if (IS_ERR(auth)) 650 return PTR_ERR(auth); 651 652 enc = crypto_spawn_skcipher(&ictx->enc); 653 err = PTR_ERR(enc); 654 if (IS_ERR(enc)) 655 goto err_free_ahash; 656 657 ctx->auth = auth; 658 ctx->enc = enc; 659 660 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + 661 crypto_ahash_alignmask(auth), 662 crypto_ahash_alignmask(auth) + 1) + 663 crypto_ablkcipher_ivsize(enc); 664 665 tfm->crt_aead.reqsize = sizeof(struct authenc_esn_request_ctx) + 666 ctx->reqoff + 667 max_t(unsigned int, 668 crypto_ahash_reqsize(auth) + 669 sizeof(struct ahash_request), 670 sizeof(struct skcipher_givcrypt_request) + 671 crypto_ablkcipher_reqsize(enc)); 672 673 return 0; 674 675 err_free_ahash: 676 crypto_free_ahash(auth); 677 return err; 678 } 679 680 static void crypto_authenc_esn_exit_tfm(struct crypto_tfm *tfm) 681 { 682 struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm); 683 684 crypto_free_ahash(ctx->auth); 685 crypto_free_ablkcipher(ctx->enc); 686 } 687 688 static struct crypto_instance *crypto_authenc_esn_alloc(struct rtattr **tb) 689 { 690 struct crypto_attr_type *algt; 691 struct crypto_instance *inst; 692 struct hash_alg_common *auth; 693 struct crypto_alg *auth_base; 694 struct crypto_alg *enc; 695 struct authenc_esn_instance_ctx *ctx; 696 const char *enc_name; 697 int err; 698 699 algt = crypto_get_attr_type(tb); 700 if (IS_ERR(algt)) 701 return ERR_CAST(algt); 702 703 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 704 return ERR_PTR(-EINVAL); 705 706 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, 707 CRYPTO_ALG_TYPE_AHASH_MASK); 708 if (IS_ERR(auth)) 709 return ERR_CAST(auth); 710 711 auth_base = &auth->base; 712 713 enc_name = crypto_attr_alg_name(tb[2]); 714 err = PTR_ERR(enc_name); 715 if (IS_ERR(enc_name)) 716 goto out_put_auth; 717 718 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); 719 err = -ENOMEM; 720 if (!inst) 721 goto out_put_auth; 722 723 ctx = crypto_instance_ctx(inst); 724 725 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); 726 if (err) 727 goto err_free_inst; 728 729 crypto_set_skcipher_spawn(&ctx->enc, inst); 730 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, 731 crypto_requires_sync(algt->type, 732 algt->mask)); 733 if (err) 734 goto err_drop_auth; 735 736 enc = crypto_skcipher_spawn_alg(&ctx->enc); 737 738 err = -ENAMETOOLONG; 739 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, 740 "authencesn(%s,%s)", auth_base->cra_name, enc->cra_name) >= 741 CRYPTO_MAX_ALG_NAME) 742 goto err_drop_enc; 743 744 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, 745 "authencesn(%s,%s)", auth_base->cra_driver_name, 746 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 747 goto err_drop_enc; 748 749 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; 750 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; 751 inst->alg.cra_priority = enc->cra_priority * 752 10 + auth_base->cra_priority; 753 inst->alg.cra_blocksize = enc->cra_blocksize; 754 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; 755 inst->alg.cra_type = &crypto_aead_type; 756 757 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; 758 inst->alg.cra_aead.maxauthsize = auth->digestsize; 759 760 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx); 761 762 inst->alg.cra_init = crypto_authenc_esn_init_tfm; 763 inst->alg.cra_exit = crypto_authenc_esn_exit_tfm; 764 765 inst->alg.cra_aead.setkey = crypto_authenc_esn_setkey; 766 inst->alg.cra_aead.encrypt = crypto_authenc_esn_encrypt; 767 inst->alg.cra_aead.decrypt = crypto_authenc_esn_decrypt; 768 inst->alg.cra_aead.givencrypt = crypto_authenc_esn_givencrypt; 769 770 out: 771 crypto_mod_put(auth_base); 772 return inst; 773 774 err_drop_enc: 775 crypto_drop_skcipher(&ctx->enc); 776 err_drop_auth: 777 crypto_drop_ahash(&ctx->auth); 778 err_free_inst: 779 kfree(inst); 780 out_put_auth: 781 inst = ERR_PTR(err); 782 goto out; 783 } 784 785 static void crypto_authenc_esn_free(struct crypto_instance *inst) 786 { 787 struct authenc_esn_instance_ctx *ctx = crypto_instance_ctx(inst); 788 789 crypto_drop_skcipher(&ctx->enc); 790 crypto_drop_ahash(&ctx->auth); 791 kfree(inst); 792 } 793 794 static struct crypto_template crypto_authenc_esn_tmpl = { 795 .name = "authencesn", 796 .alloc = crypto_authenc_esn_alloc, 797 .free = crypto_authenc_esn_free, 798 .module = THIS_MODULE, 799 }; 800 801 static int __init crypto_authenc_esn_module_init(void) 802 { 803 return crypto_register_template(&crypto_authenc_esn_tmpl); 804 } 805 806 static void __exit crypto_authenc_esn_module_exit(void) 807 { 808 crypto_unregister_template(&crypto_authenc_esn_tmpl); 809 } 810 811 module_init(crypto_authenc_esn_module_init); 812 module_exit(crypto_authenc_esn_module_exit); 813 814 MODULE_LICENSE("GPL"); 815 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); 816 MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers"); 817