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