1 /* 2 * Authenc: Simple AEAD wrapper for IPsec 3 * 4 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> 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 as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 13 #include <crypto/aead.h> 14 #include <crypto/internal/hash.h> 15 #include <crypto/internal/skcipher.h> 16 #include <crypto/authenc.h> 17 #include <crypto/scatterwalk.h> 18 #include <linux/err.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/slab.h> 24 #include <linux/spinlock.h> 25 26 typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags); 27 28 struct authenc_instance_ctx { 29 struct crypto_ahash_spawn auth; 30 struct crypto_skcipher_spawn enc; 31 }; 32 33 struct crypto_authenc_ctx { 34 unsigned int reqoff; 35 struct crypto_ahash *auth; 36 struct crypto_ablkcipher *enc; 37 }; 38 39 struct authenc_request_ctx { 40 unsigned int cryptlen; 41 struct scatterlist *sg; 42 struct scatterlist asg[2]; 43 struct scatterlist cipher[2]; 44 crypto_completion_t complete; 45 crypto_completion_t update_complete; 46 char tail[]; 47 }; 48 49 static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, 50 unsigned int keylen) 51 { 52 unsigned int authkeylen; 53 unsigned int enckeylen; 54 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 55 struct crypto_ahash *auth = ctx->auth; 56 struct crypto_ablkcipher *enc = ctx->enc; 57 struct rtattr *rta = (void *)key; 58 struct crypto_authenc_key_param *param; 59 int err = -EINVAL; 60 61 if (!RTA_OK(rta, keylen)) 62 goto badkey; 63 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) 64 goto badkey; 65 if (RTA_PAYLOAD(rta) < sizeof(*param)) 66 goto badkey; 67 68 param = RTA_DATA(rta); 69 enckeylen = be32_to_cpu(param->enckeylen); 70 71 key += RTA_ALIGN(rta->rta_len); 72 keylen -= RTA_ALIGN(rta->rta_len); 73 74 if (keylen < enckeylen) 75 goto badkey; 76 77 authkeylen = keylen - enckeylen; 78 79 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); 80 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & 81 CRYPTO_TFM_REQ_MASK); 82 err = crypto_ahash_setkey(auth, key, authkeylen); 83 crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & 84 CRYPTO_TFM_RES_MASK); 85 86 if (err) 87 goto out; 88 89 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); 90 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) & 91 CRYPTO_TFM_REQ_MASK); 92 err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen); 93 crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) & 94 CRYPTO_TFM_RES_MASK); 95 96 out: 97 return err; 98 99 badkey: 100 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); 101 goto out; 102 } 103 104 static void authenc_chain(struct scatterlist *head, struct scatterlist *sg, 105 int chain) 106 { 107 if (chain) { 108 head->length += sg->length; 109 sg = scatterwalk_sg_next(sg); 110 } 111 112 if (sg) 113 scatterwalk_sg_chain(head, 2, sg); 114 else 115 sg_mark_end(head); 116 } 117 118 static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq, 119 int err) 120 { 121 struct aead_request *req = areq->data; 122 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 123 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 124 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 125 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 126 127 if (err) 128 goto out; 129 130 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, 131 areq_ctx->cryptlen); 132 ahash_request_set_callback(ahreq, aead_request_flags(req) & 133 CRYPTO_TFM_REQ_MAY_SLEEP, 134 areq_ctx->complete, req); 135 136 err = crypto_ahash_finup(ahreq); 137 if (err) 138 goto out; 139 140 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, 141 areq_ctx->cryptlen, 142 crypto_aead_authsize(authenc), 1); 143 144 out: 145 aead_request_complete(req, err); 146 } 147 148 static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err) 149 { 150 struct aead_request *req = areq->data; 151 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 152 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 153 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 154 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 155 156 if (err) 157 goto out; 158 159 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, 160 areq_ctx->cryptlen, 161 crypto_aead_authsize(authenc), 1); 162 163 out: 164 aead_request_complete(req, err); 165 } 166 167 static void authenc_verify_ahash_update_done(struct crypto_async_request *areq, 168 int err) 169 { 170 u8 *ihash; 171 unsigned int authsize; 172 struct ablkcipher_request *abreq; 173 struct aead_request *req = areq->data; 174 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 175 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 176 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 177 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 178 179 if (err) 180 goto out; 181 182 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, 183 areq_ctx->cryptlen); 184 ahash_request_set_callback(ahreq, aead_request_flags(req) & 185 CRYPTO_TFM_REQ_MAY_SLEEP, 186 areq_ctx->complete, req); 187 188 err = crypto_ahash_finup(ahreq); 189 if (err) 190 goto out; 191 192 authsize = crypto_aead_authsize(authenc); 193 ihash = ahreq->result + authsize; 194 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 195 authsize, 0); 196 197 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; 198 if (err) 199 goto out; 200 201 abreq = aead_request_ctx(req); 202 ablkcipher_request_set_tfm(abreq, ctx->enc); 203 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 204 req->base.complete, req->base.data); 205 ablkcipher_request_set_crypt(abreq, req->src, req->dst, 206 req->cryptlen, req->iv); 207 208 err = crypto_ablkcipher_decrypt(abreq); 209 210 out: 211 aead_request_complete(req, err); 212 } 213 214 static void authenc_verify_ahash_done(struct crypto_async_request *areq, 215 int err) 216 { 217 u8 *ihash; 218 unsigned int authsize; 219 struct ablkcipher_request *abreq; 220 struct aead_request *req = areq->data; 221 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 222 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 223 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 224 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 225 226 if (err) 227 goto out; 228 229 authsize = crypto_aead_authsize(authenc); 230 ihash = ahreq->result + authsize; 231 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 232 authsize, 0); 233 234 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; 235 if (err) 236 goto out; 237 238 abreq = aead_request_ctx(req); 239 ablkcipher_request_set_tfm(abreq, ctx->enc); 240 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 241 req->base.complete, req->base.data); 242 ablkcipher_request_set_crypt(abreq, req->src, req->dst, 243 req->cryptlen, req->iv); 244 245 err = crypto_ablkcipher_decrypt(abreq); 246 247 out: 248 aead_request_complete(req, err); 249 } 250 251 static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags) 252 { 253 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 254 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 255 struct crypto_ahash *auth = ctx->auth; 256 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 257 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 258 u8 *hash = areq_ctx->tail; 259 int err; 260 261 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), 262 crypto_ahash_alignmask(auth) + 1); 263 264 ahash_request_set_tfm(ahreq, auth); 265 266 err = crypto_ahash_init(ahreq); 267 if (err) 268 return ERR_PTR(err); 269 270 ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen); 271 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 272 areq_ctx->update_complete, req); 273 274 err = crypto_ahash_update(ahreq); 275 if (err) 276 return ERR_PTR(err); 277 278 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, 279 areq_ctx->cryptlen); 280 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 281 areq_ctx->complete, req); 282 283 err = crypto_ahash_finup(ahreq); 284 if (err) 285 return ERR_PTR(err); 286 287 return hash; 288 } 289 290 static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags) 291 { 292 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 293 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 294 struct crypto_ahash *auth = ctx->auth; 295 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 296 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 297 u8 *hash = areq_ctx->tail; 298 int err; 299 300 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), 301 crypto_ahash_alignmask(auth) + 1); 302 303 ahash_request_set_tfm(ahreq, auth); 304 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, 305 areq_ctx->cryptlen); 306 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 307 areq_ctx->complete, req); 308 309 err = crypto_ahash_digest(ahreq); 310 if (err) 311 return ERR_PTR(err); 312 313 return hash; 314 } 315 316 static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, 317 unsigned int flags) 318 { 319 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 320 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 321 struct scatterlist *dst = req->dst; 322 struct scatterlist *assoc = req->assoc; 323 struct scatterlist *cipher = areq_ctx->cipher; 324 struct scatterlist *asg = areq_ctx->asg; 325 unsigned int ivsize = crypto_aead_ivsize(authenc); 326 unsigned int cryptlen = req->cryptlen; 327 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; 328 struct page *dstp; 329 u8 *vdst; 330 u8 *hash; 331 332 dstp = sg_page(dst); 333 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; 334 335 if (ivsize) { 336 sg_init_table(cipher, 2); 337 sg_set_buf(cipher, iv, ivsize); 338 authenc_chain(cipher, dst, vdst == iv + ivsize); 339 dst = cipher; 340 cryptlen += ivsize; 341 } 342 343 if (sg_is_last(assoc)) { 344 authenc_ahash_fn = crypto_authenc_ahash; 345 sg_init_table(asg, 2); 346 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); 347 authenc_chain(asg, dst, 0); 348 dst = asg; 349 cryptlen += req->assoclen; 350 } 351 352 areq_ctx->cryptlen = cryptlen; 353 areq_ctx->sg = dst; 354 355 areq_ctx->complete = authenc_geniv_ahash_done; 356 areq_ctx->update_complete = authenc_geniv_ahash_update_done; 357 358 hash = authenc_ahash_fn(req, flags); 359 if (IS_ERR(hash)) 360 return PTR_ERR(hash); 361 362 scatterwalk_map_and_copy(hash, dst, cryptlen, 363 crypto_aead_authsize(authenc), 1); 364 return 0; 365 } 366 367 static void crypto_authenc_encrypt_done(struct crypto_async_request *req, 368 int err) 369 { 370 struct aead_request *areq = req->data; 371 372 if (!err) { 373 struct crypto_aead *authenc = crypto_aead_reqtfm(areq); 374 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 375 struct ablkcipher_request *abreq = aead_request_ctx(areq); 376 u8 *iv = (u8 *)(abreq + 1) + 377 crypto_ablkcipher_reqsize(ctx->enc); 378 379 err = crypto_authenc_genicv(areq, iv, 0); 380 } 381 382 aead_request_complete(areq, err); 383 } 384 385 static int crypto_authenc_encrypt(struct aead_request *req) 386 { 387 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 388 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 389 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 390 struct crypto_ablkcipher *enc = ctx->enc; 391 struct scatterlist *dst = req->dst; 392 unsigned int cryptlen = req->cryptlen; 393 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail 394 + ctx->reqoff); 395 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); 396 int err; 397 398 ablkcipher_request_set_tfm(abreq, enc); 399 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 400 crypto_authenc_encrypt_done, req); 401 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); 402 403 memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); 404 405 err = crypto_ablkcipher_encrypt(abreq); 406 if (err) 407 return err; 408 409 return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); 410 } 411 412 static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, 413 int err) 414 { 415 struct aead_request *areq = req->data; 416 417 if (!err) { 418 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); 419 420 err = crypto_authenc_genicv(areq, greq->giv, 0); 421 } 422 423 aead_request_complete(areq, err); 424 } 425 426 static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) 427 { 428 struct crypto_aead *authenc = aead_givcrypt_reqtfm(req); 429 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 430 struct aead_request *areq = &req->areq; 431 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); 432 u8 *iv = req->giv; 433 int err; 434 435 skcipher_givcrypt_set_tfm(greq, ctx->enc); 436 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), 437 crypto_authenc_givencrypt_done, areq); 438 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, 439 areq->iv); 440 skcipher_givcrypt_set_giv(greq, iv, req->seq); 441 442 err = crypto_skcipher_givencrypt(greq); 443 if (err) 444 return err; 445 446 return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); 447 } 448 449 static int crypto_authenc_verify(struct aead_request *req, 450 authenc_ahash_t authenc_ahash_fn) 451 { 452 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 453 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 454 u8 *ohash; 455 u8 *ihash; 456 unsigned int authsize; 457 458 areq_ctx->complete = authenc_verify_ahash_done; 459 areq_ctx->update_complete = authenc_verify_ahash_update_done; 460 461 ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); 462 if (IS_ERR(ohash)) 463 return PTR_ERR(ohash); 464 465 authsize = crypto_aead_authsize(authenc); 466 ihash = ohash + authsize; 467 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 468 authsize, 0); 469 return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0; 470 } 471 472 static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, 473 unsigned int cryptlen) 474 { 475 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 476 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 477 struct scatterlist *src = req->src; 478 struct scatterlist *assoc = req->assoc; 479 struct scatterlist *cipher = areq_ctx->cipher; 480 struct scatterlist *asg = areq_ctx->asg; 481 unsigned int ivsize = crypto_aead_ivsize(authenc); 482 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; 483 struct page *srcp; 484 u8 *vsrc; 485 486 srcp = sg_page(src); 487 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; 488 489 if (ivsize) { 490 sg_init_table(cipher, 2); 491 sg_set_buf(cipher, iv, ivsize); 492 authenc_chain(cipher, src, vsrc == iv + ivsize); 493 src = cipher; 494 cryptlen += ivsize; 495 } 496 497 if (sg_is_last(assoc)) { 498 authenc_ahash_fn = crypto_authenc_ahash; 499 sg_init_table(asg, 2); 500 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); 501 authenc_chain(asg, src, 0); 502 src = asg; 503 cryptlen += req->assoclen; 504 } 505 506 areq_ctx->cryptlen = cryptlen; 507 areq_ctx->sg = src; 508 509 return crypto_authenc_verify(req, authenc_ahash_fn); 510 } 511 512 static int crypto_authenc_decrypt(struct aead_request *req) 513 { 514 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 515 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 516 struct ablkcipher_request *abreq = aead_request_ctx(req); 517 unsigned int cryptlen = req->cryptlen; 518 unsigned int authsize = crypto_aead_authsize(authenc); 519 u8 *iv = req->iv; 520 int err; 521 522 if (cryptlen < authsize) 523 return -EINVAL; 524 cryptlen -= authsize; 525 526 err = crypto_authenc_iverify(req, iv, cryptlen); 527 if (err) 528 return err; 529 530 ablkcipher_request_set_tfm(abreq, ctx->enc); 531 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 532 req->base.complete, req->base.data); 533 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); 534 535 return crypto_ablkcipher_decrypt(abreq); 536 } 537 538 static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) 539 { 540 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); 541 struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); 542 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); 543 struct crypto_ahash *auth; 544 struct crypto_ablkcipher *enc; 545 int err; 546 547 auth = crypto_spawn_ahash(&ictx->auth); 548 if (IS_ERR(auth)) 549 return PTR_ERR(auth); 550 551 enc = crypto_spawn_skcipher(&ictx->enc); 552 err = PTR_ERR(enc); 553 if (IS_ERR(enc)) 554 goto err_free_ahash; 555 556 ctx->auth = auth; 557 ctx->enc = enc; 558 559 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + 560 crypto_ahash_alignmask(auth), 561 crypto_ahash_alignmask(auth) + 1) + 562 crypto_ablkcipher_ivsize(enc); 563 564 tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) + 565 ctx->reqoff + 566 max_t(unsigned int, 567 crypto_ahash_reqsize(auth) + 568 sizeof(struct ahash_request), 569 sizeof(struct skcipher_givcrypt_request) + 570 crypto_ablkcipher_reqsize(enc)); 571 572 return 0; 573 574 err_free_ahash: 575 crypto_free_ahash(auth); 576 return err; 577 } 578 579 static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) 580 { 581 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); 582 583 crypto_free_ahash(ctx->auth); 584 crypto_free_ablkcipher(ctx->enc); 585 } 586 587 static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) 588 { 589 struct crypto_attr_type *algt; 590 struct crypto_instance *inst; 591 struct hash_alg_common *auth; 592 struct crypto_alg *auth_base; 593 struct crypto_alg *enc; 594 struct authenc_instance_ctx *ctx; 595 const char *enc_name; 596 int err; 597 598 algt = crypto_get_attr_type(tb); 599 err = PTR_ERR(algt); 600 if (IS_ERR(algt)) 601 return ERR_PTR(err); 602 603 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 604 return ERR_PTR(-EINVAL); 605 606 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, 607 CRYPTO_ALG_TYPE_AHASH_MASK); 608 if (IS_ERR(auth)) 609 return ERR_PTR(PTR_ERR(auth)); 610 611 auth_base = &auth->base; 612 613 enc_name = crypto_attr_alg_name(tb[2]); 614 err = PTR_ERR(enc_name); 615 if (IS_ERR(enc_name)) 616 goto out_put_auth; 617 618 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); 619 err = -ENOMEM; 620 if (!inst) 621 goto out_put_auth; 622 623 ctx = crypto_instance_ctx(inst); 624 625 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); 626 if (err) 627 goto err_free_inst; 628 629 crypto_set_skcipher_spawn(&ctx->enc, inst); 630 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, 631 crypto_requires_sync(algt->type, 632 algt->mask)); 633 if (err) 634 goto err_drop_auth; 635 636 enc = crypto_skcipher_spawn_alg(&ctx->enc); 637 638 err = -ENAMETOOLONG; 639 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, 640 "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= 641 CRYPTO_MAX_ALG_NAME) 642 goto err_drop_enc; 643 644 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, 645 "authenc(%s,%s)", auth_base->cra_driver_name, 646 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 647 goto err_drop_enc; 648 649 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; 650 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; 651 inst->alg.cra_priority = enc->cra_priority * 652 10 + auth_base->cra_priority; 653 inst->alg.cra_blocksize = enc->cra_blocksize; 654 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; 655 inst->alg.cra_type = &crypto_aead_type; 656 657 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; 658 inst->alg.cra_aead.maxauthsize = auth->digestsize; 659 660 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx); 661 662 inst->alg.cra_init = crypto_authenc_init_tfm; 663 inst->alg.cra_exit = crypto_authenc_exit_tfm; 664 665 inst->alg.cra_aead.setkey = crypto_authenc_setkey; 666 inst->alg.cra_aead.encrypt = crypto_authenc_encrypt; 667 inst->alg.cra_aead.decrypt = crypto_authenc_decrypt; 668 inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; 669 670 out: 671 crypto_mod_put(auth_base); 672 return inst; 673 674 err_drop_enc: 675 crypto_drop_skcipher(&ctx->enc); 676 err_drop_auth: 677 crypto_drop_ahash(&ctx->auth); 678 err_free_inst: 679 kfree(inst); 680 out_put_auth: 681 inst = ERR_PTR(err); 682 goto out; 683 } 684 685 static void crypto_authenc_free(struct crypto_instance *inst) 686 { 687 struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); 688 689 crypto_drop_skcipher(&ctx->enc); 690 crypto_drop_ahash(&ctx->auth); 691 kfree(inst); 692 } 693 694 static struct crypto_template crypto_authenc_tmpl = { 695 .name = "authenc", 696 .alloc = crypto_authenc_alloc, 697 .free = crypto_authenc_free, 698 .module = THIS_MODULE, 699 }; 700 701 static int __init crypto_authenc_module_init(void) 702 { 703 return crypto_register_template(&crypto_authenc_tmpl); 704 } 705 706 static void __exit crypto_authenc_module_exit(void) 707 { 708 crypto_unregister_template(&crypto_authenc_tmpl); 709 } 710 711 module_init(crypto_authenc_module_init); 712 module_exit(crypto_authenc_module_exit); 713 714 MODULE_LICENSE("GPL"); 715 MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); 716