1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ESSIV skcipher and aead template for block encryption 4 * 5 * This template encapsulates the ESSIV IV generation algorithm used by 6 * dm-crypt and fscrypt, which converts the initial vector for the skcipher 7 * used for block encryption, by encrypting it using the hash of the 8 * skcipher key as encryption key. Usually, the input IV is a 64-bit sector 9 * number in LE representation zero-padded to the size of the IV, but this 10 * is not assumed by this driver. 11 * 12 * The typical use of this template is to instantiate the skcipher 13 * 'essiv(cbc(aes),sha256)', which is the only instantiation used by 14 * fscrypt, and the most relevant one for dm-crypt. However, dm-crypt 15 * also permits ESSIV to be used in combination with the authenc template, 16 * e.g., 'essiv(authenc(hmac(sha256),cbc(aes)),sha256)', in which case 17 * we need to instantiate an aead that accepts the same special key format 18 * as the authenc template, and deals with the way the encrypted IV is 19 * embedded into the AAD area of the aead request. This means the AEAD 20 * flavor produced by this template is tightly coupled to the way dm-crypt 21 * happens to use it. 22 * 23 * Copyright (c) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org> 24 * 25 * Heavily based on: 26 * adiantum length-preserving encryption mode 27 * 28 * Copyright 2018 Google LLC 29 */ 30 31 #include <crypto/authenc.h> 32 #include <crypto/internal/aead.h> 33 #include <crypto/internal/cipher.h> 34 #include <crypto/internal/hash.h> 35 #include <crypto/internal/skcipher.h> 36 #include <crypto/scatterwalk.h> 37 #include <linux/module.h> 38 39 #include "internal.h" 40 41 struct essiv_instance_ctx { 42 union { 43 struct crypto_skcipher_spawn skcipher_spawn; 44 struct crypto_aead_spawn aead_spawn; 45 } u; 46 char essiv_cipher_name[CRYPTO_MAX_ALG_NAME]; 47 char shash_driver_name[CRYPTO_MAX_ALG_NAME]; 48 }; 49 50 struct essiv_tfm_ctx { 51 union { 52 struct crypto_skcipher *skcipher; 53 struct crypto_aead *aead; 54 } u; 55 struct crypto_cipher *essiv_cipher; 56 struct crypto_shash *hash; 57 int ivoffset; 58 }; 59 60 struct essiv_aead_request_ctx { 61 struct scatterlist sg[4]; 62 u8 *assoc; 63 struct aead_request aead_req; 64 }; 65 66 static int essiv_skcipher_setkey(struct crypto_skcipher *tfm, 67 const u8 *key, unsigned int keylen) 68 { 69 struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); 70 u8 salt[HASH_MAX_DIGESTSIZE]; 71 int err; 72 73 crypto_skcipher_clear_flags(tctx->u.skcipher, CRYPTO_TFM_REQ_MASK); 74 crypto_skcipher_set_flags(tctx->u.skcipher, 75 crypto_skcipher_get_flags(tfm) & 76 CRYPTO_TFM_REQ_MASK); 77 err = crypto_skcipher_setkey(tctx->u.skcipher, key, keylen); 78 if (err) 79 return err; 80 81 err = crypto_shash_tfm_digest(tctx->hash, key, keylen, salt); 82 if (err) 83 return err; 84 85 crypto_cipher_clear_flags(tctx->essiv_cipher, CRYPTO_TFM_REQ_MASK); 86 crypto_cipher_set_flags(tctx->essiv_cipher, 87 crypto_skcipher_get_flags(tfm) & 88 CRYPTO_TFM_REQ_MASK); 89 return crypto_cipher_setkey(tctx->essiv_cipher, salt, 90 crypto_shash_digestsize(tctx->hash)); 91 } 92 93 static int essiv_aead_setkey(struct crypto_aead *tfm, const u8 *key, 94 unsigned int keylen) 95 { 96 struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); 97 SHASH_DESC_ON_STACK(desc, tctx->hash); 98 struct crypto_authenc_keys keys; 99 u8 salt[HASH_MAX_DIGESTSIZE]; 100 int err; 101 102 crypto_aead_clear_flags(tctx->u.aead, CRYPTO_TFM_REQ_MASK); 103 crypto_aead_set_flags(tctx->u.aead, crypto_aead_get_flags(tfm) & 104 CRYPTO_TFM_REQ_MASK); 105 err = crypto_aead_setkey(tctx->u.aead, key, keylen); 106 if (err) 107 return err; 108 109 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) 110 return -EINVAL; 111 112 desc->tfm = tctx->hash; 113 err = crypto_shash_init(desc) ?: 114 crypto_shash_update(desc, keys.enckey, keys.enckeylen) ?: 115 crypto_shash_finup(desc, keys.authkey, keys.authkeylen, salt); 116 if (err) 117 return err; 118 119 crypto_cipher_clear_flags(tctx->essiv_cipher, CRYPTO_TFM_REQ_MASK); 120 crypto_cipher_set_flags(tctx->essiv_cipher, crypto_aead_get_flags(tfm) & 121 CRYPTO_TFM_REQ_MASK); 122 return crypto_cipher_setkey(tctx->essiv_cipher, salt, 123 crypto_shash_digestsize(tctx->hash)); 124 } 125 126 static int essiv_aead_setauthsize(struct crypto_aead *tfm, 127 unsigned int authsize) 128 { 129 struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); 130 131 return crypto_aead_setauthsize(tctx->u.aead, authsize); 132 } 133 134 static void essiv_skcipher_done(struct crypto_async_request *areq, int err) 135 { 136 struct skcipher_request *req = areq->data; 137 138 skcipher_request_complete(req, err); 139 } 140 141 static int essiv_skcipher_crypt(struct skcipher_request *req, bool enc) 142 { 143 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 144 const struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); 145 struct skcipher_request *subreq = skcipher_request_ctx(req); 146 147 crypto_cipher_encrypt_one(tctx->essiv_cipher, req->iv, req->iv); 148 149 skcipher_request_set_tfm(subreq, tctx->u.skcipher); 150 skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, 151 req->iv); 152 skcipher_request_set_callback(subreq, skcipher_request_flags(req), 153 essiv_skcipher_done, req); 154 155 return enc ? crypto_skcipher_encrypt(subreq) : 156 crypto_skcipher_decrypt(subreq); 157 } 158 159 static int essiv_skcipher_encrypt(struct skcipher_request *req) 160 { 161 return essiv_skcipher_crypt(req, true); 162 } 163 164 static int essiv_skcipher_decrypt(struct skcipher_request *req) 165 { 166 return essiv_skcipher_crypt(req, false); 167 } 168 169 static void essiv_aead_done(struct crypto_async_request *areq, int err) 170 { 171 struct aead_request *req = areq->data; 172 struct essiv_aead_request_ctx *rctx = aead_request_ctx(req); 173 174 kfree(rctx->assoc); 175 aead_request_complete(req, err); 176 } 177 178 static int essiv_aead_crypt(struct aead_request *req, bool enc) 179 { 180 struct crypto_aead *tfm = crypto_aead_reqtfm(req); 181 const struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); 182 struct essiv_aead_request_ctx *rctx = aead_request_ctx(req); 183 struct aead_request *subreq = &rctx->aead_req; 184 struct scatterlist *src = req->src; 185 int err; 186 187 crypto_cipher_encrypt_one(tctx->essiv_cipher, req->iv, req->iv); 188 189 /* 190 * dm-crypt embeds the sector number and the IV in the AAD region, so 191 * we have to copy the converted IV into the right scatterlist before 192 * we pass it on. 193 */ 194 rctx->assoc = NULL; 195 if (req->src == req->dst || !enc) { 196 scatterwalk_map_and_copy(req->iv, req->dst, 197 req->assoclen - crypto_aead_ivsize(tfm), 198 crypto_aead_ivsize(tfm), 1); 199 } else { 200 u8 *iv = (u8 *)aead_request_ctx(req) + tctx->ivoffset; 201 int ivsize = crypto_aead_ivsize(tfm); 202 int ssize = req->assoclen - ivsize; 203 struct scatterlist *sg; 204 int nents; 205 206 if (ssize < 0) 207 return -EINVAL; 208 209 nents = sg_nents_for_len(req->src, ssize); 210 if (nents < 0) 211 return -EINVAL; 212 213 memcpy(iv, req->iv, ivsize); 214 sg_init_table(rctx->sg, 4); 215 216 if (unlikely(nents > 1)) { 217 /* 218 * This is a case that rarely occurs in practice, but 219 * for correctness, we have to deal with it nonetheless. 220 */ 221 rctx->assoc = kmalloc(ssize, GFP_ATOMIC); 222 if (!rctx->assoc) 223 return -ENOMEM; 224 225 scatterwalk_map_and_copy(rctx->assoc, req->src, 0, 226 ssize, 0); 227 sg_set_buf(rctx->sg, rctx->assoc, ssize); 228 } else { 229 sg_set_page(rctx->sg, sg_page(req->src), ssize, 230 req->src->offset); 231 } 232 233 sg_set_buf(rctx->sg + 1, iv, ivsize); 234 sg = scatterwalk_ffwd(rctx->sg + 2, req->src, req->assoclen); 235 if (sg != rctx->sg + 2) 236 sg_chain(rctx->sg, 3, sg); 237 238 src = rctx->sg; 239 } 240 241 aead_request_set_tfm(subreq, tctx->u.aead); 242 aead_request_set_ad(subreq, req->assoclen); 243 aead_request_set_callback(subreq, aead_request_flags(req), 244 essiv_aead_done, req); 245 aead_request_set_crypt(subreq, src, req->dst, req->cryptlen, req->iv); 246 247 err = enc ? crypto_aead_encrypt(subreq) : 248 crypto_aead_decrypt(subreq); 249 250 if (rctx->assoc && err != -EINPROGRESS) 251 kfree(rctx->assoc); 252 return err; 253 } 254 255 static int essiv_aead_encrypt(struct aead_request *req) 256 { 257 return essiv_aead_crypt(req, true); 258 } 259 260 static int essiv_aead_decrypt(struct aead_request *req) 261 { 262 return essiv_aead_crypt(req, false); 263 } 264 265 static int essiv_init_tfm(struct essiv_instance_ctx *ictx, 266 struct essiv_tfm_ctx *tctx) 267 { 268 struct crypto_cipher *essiv_cipher; 269 struct crypto_shash *hash; 270 int err; 271 272 essiv_cipher = crypto_alloc_cipher(ictx->essiv_cipher_name, 0, 0); 273 if (IS_ERR(essiv_cipher)) 274 return PTR_ERR(essiv_cipher); 275 276 hash = crypto_alloc_shash(ictx->shash_driver_name, 0, 0); 277 if (IS_ERR(hash)) { 278 err = PTR_ERR(hash); 279 goto err_free_essiv_cipher; 280 } 281 282 tctx->essiv_cipher = essiv_cipher; 283 tctx->hash = hash; 284 285 return 0; 286 287 err_free_essiv_cipher: 288 crypto_free_cipher(essiv_cipher); 289 return err; 290 } 291 292 static int essiv_skcipher_init_tfm(struct crypto_skcipher *tfm) 293 { 294 struct skcipher_instance *inst = skcipher_alg_instance(tfm); 295 struct essiv_instance_ctx *ictx = skcipher_instance_ctx(inst); 296 struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); 297 struct crypto_skcipher *skcipher; 298 int err; 299 300 skcipher = crypto_spawn_skcipher(&ictx->u.skcipher_spawn); 301 if (IS_ERR(skcipher)) 302 return PTR_ERR(skcipher); 303 304 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) + 305 crypto_skcipher_reqsize(skcipher)); 306 307 err = essiv_init_tfm(ictx, tctx); 308 if (err) { 309 crypto_free_skcipher(skcipher); 310 return err; 311 } 312 313 tctx->u.skcipher = skcipher; 314 return 0; 315 } 316 317 static int essiv_aead_init_tfm(struct crypto_aead *tfm) 318 { 319 struct aead_instance *inst = aead_alg_instance(tfm); 320 struct essiv_instance_ctx *ictx = aead_instance_ctx(inst); 321 struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); 322 struct crypto_aead *aead; 323 unsigned int subreq_size; 324 int err; 325 326 BUILD_BUG_ON(offsetofend(struct essiv_aead_request_ctx, aead_req) != 327 sizeof(struct essiv_aead_request_ctx)); 328 329 aead = crypto_spawn_aead(&ictx->u.aead_spawn); 330 if (IS_ERR(aead)) 331 return PTR_ERR(aead); 332 333 subreq_size = sizeof_field(struct essiv_aead_request_ctx, aead_req) + 334 crypto_aead_reqsize(aead); 335 336 tctx->ivoffset = offsetof(struct essiv_aead_request_ctx, aead_req) + 337 subreq_size; 338 crypto_aead_set_reqsize(tfm, tctx->ivoffset + crypto_aead_ivsize(aead)); 339 340 err = essiv_init_tfm(ictx, tctx); 341 if (err) { 342 crypto_free_aead(aead); 343 return err; 344 } 345 346 tctx->u.aead = aead; 347 return 0; 348 } 349 350 static void essiv_skcipher_exit_tfm(struct crypto_skcipher *tfm) 351 { 352 struct essiv_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); 353 354 crypto_free_skcipher(tctx->u.skcipher); 355 crypto_free_cipher(tctx->essiv_cipher); 356 crypto_free_shash(tctx->hash); 357 } 358 359 static void essiv_aead_exit_tfm(struct crypto_aead *tfm) 360 { 361 struct essiv_tfm_ctx *tctx = crypto_aead_ctx(tfm); 362 363 crypto_free_aead(tctx->u.aead); 364 crypto_free_cipher(tctx->essiv_cipher); 365 crypto_free_shash(tctx->hash); 366 } 367 368 static void essiv_skcipher_free_instance(struct skcipher_instance *inst) 369 { 370 struct essiv_instance_ctx *ictx = skcipher_instance_ctx(inst); 371 372 crypto_drop_skcipher(&ictx->u.skcipher_spawn); 373 kfree(inst); 374 } 375 376 static void essiv_aead_free_instance(struct aead_instance *inst) 377 { 378 struct essiv_instance_ctx *ictx = aead_instance_ctx(inst); 379 380 crypto_drop_aead(&ictx->u.aead_spawn); 381 kfree(inst); 382 } 383 384 static bool parse_cipher_name(char *essiv_cipher_name, const char *cra_name) 385 { 386 const char *p, *q; 387 int len; 388 389 /* find the last opening parens */ 390 p = strrchr(cra_name, '('); 391 if (!p++) 392 return false; 393 394 /* find the first closing parens in the tail of the string */ 395 q = strchr(p, ')'); 396 if (!q) 397 return false; 398 399 len = q - p; 400 if (len >= CRYPTO_MAX_ALG_NAME) 401 return false; 402 403 memcpy(essiv_cipher_name, p, len); 404 essiv_cipher_name[len] = '\0'; 405 return true; 406 } 407 408 static bool essiv_supported_algorithms(const char *essiv_cipher_name, 409 struct shash_alg *hash_alg, 410 int ivsize) 411 { 412 struct crypto_alg *alg; 413 bool ret = false; 414 415 alg = crypto_alg_mod_lookup(essiv_cipher_name, 416 CRYPTO_ALG_TYPE_CIPHER, 417 CRYPTO_ALG_TYPE_MASK); 418 if (IS_ERR(alg)) 419 return false; 420 421 if (hash_alg->digestsize < alg->cra_cipher.cia_min_keysize || 422 hash_alg->digestsize > alg->cra_cipher.cia_max_keysize) 423 goto out; 424 425 if (ivsize != alg->cra_blocksize) 426 goto out; 427 428 if (crypto_shash_alg_needs_key(hash_alg)) 429 goto out; 430 431 ret = true; 432 433 out: 434 crypto_mod_put(alg); 435 return ret; 436 } 437 438 static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb) 439 { 440 struct crypto_attr_type *algt; 441 const char *inner_cipher_name; 442 const char *shash_name; 443 struct skcipher_instance *skcipher_inst = NULL; 444 struct aead_instance *aead_inst = NULL; 445 struct crypto_instance *inst; 446 struct crypto_alg *base, *block_base; 447 struct essiv_instance_ctx *ictx; 448 struct skcipher_alg *skcipher_alg = NULL; 449 struct aead_alg *aead_alg = NULL; 450 struct crypto_alg *_hash_alg; 451 struct shash_alg *hash_alg; 452 int ivsize; 453 u32 type; 454 u32 mask; 455 int err; 456 457 algt = crypto_get_attr_type(tb); 458 if (IS_ERR(algt)) 459 return PTR_ERR(algt); 460 461 inner_cipher_name = crypto_attr_alg_name(tb[1]); 462 if (IS_ERR(inner_cipher_name)) 463 return PTR_ERR(inner_cipher_name); 464 465 shash_name = crypto_attr_alg_name(tb[2]); 466 if (IS_ERR(shash_name)) 467 return PTR_ERR(shash_name); 468 469 type = algt->type & algt->mask; 470 mask = crypto_algt_inherited_mask(algt); 471 472 switch (type) { 473 case CRYPTO_ALG_TYPE_SKCIPHER: 474 skcipher_inst = kzalloc(sizeof(*skcipher_inst) + 475 sizeof(*ictx), GFP_KERNEL); 476 if (!skcipher_inst) 477 return -ENOMEM; 478 inst = skcipher_crypto_instance(skcipher_inst); 479 base = &skcipher_inst->alg.base; 480 ictx = crypto_instance_ctx(inst); 481 482 /* Symmetric cipher, e.g., "cbc(aes)" */ 483 err = crypto_grab_skcipher(&ictx->u.skcipher_spawn, inst, 484 inner_cipher_name, 0, mask); 485 if (err) 486 goto out_free_inst; 487 skcipher_alg = crypto_spawn_skcipher_alg(&ictx->u.skcipher_spawn); 488 block_base = &skcipher_alg->base; 489 ivsize = crypto_skcipher_alg_ivsize(skcipher_alg); 490 break; 491 492 case CRYPTO_ALG_TYPE_AEAD: 493 aead_inst = kzalloc(sizeof(*aead_inst) + 494 sizeof(*ictx), GFP_KERNEL); 495 if (!aead_inst) 496 return -ENOMEM; 497 inst = aead_crypto_instance(aead_inst); 498 base = &aead_inst->alg.base; 499 ictx = crypto_instance_ctx(inst); 500 501 /* AEAD cipher, e.g., "authenc(hmac(sha256),cbc(aes))" */ 502 err = crypto_grab_aead(&ictx->u.aead_spawn, inst, 503 inner_cipher_name, 0, mask); 504 if (err) 505 goto out_free_inst; 506 aead_alg = crypto_spawn_aead_alg(&ictx->u.aead_spawn); 507 block_base = &aead_alg->base; 508 if (!strstarts(block_base->cra_name, "authenc(")) { 509 pr_warn("Only authenc() type AEADs are supported by ESSIV\n"); 510 err = -EINVAL; 511 goto out_drop_skcipher; 512 } 513 ivsize = aead_alg->ivsize; 514 break; 515 516 default: 517 return -EINVAL; 518 } 519 520 if (!parse_cipher_name(ictx->essiv_cipher_name, block_base->cra_name)) { 521 pr_warn("Failed to parse ESSIV cipher name from skcipher cra_name\n"); 522 err = -EINVAL; 523 goto out_drop_skcipher; 524 } 525 526 /* Synchronous hash, e.g., "sha256" */ 527 _hash_alg = crypto_alg_mod_lookup(shash_name, 528 CRYPTO_ALG_TYPE_SHASH, 529 CRYPTO_ALG_TYPE_MASK | mask); 530 if (IS_ERR(_hash_alg)) { 531 err = PTR_ERR(_hash_alg); 532 goto out_drop_skcipher; 533 } 534 hash_alg = __crypto_shash_alg(_hash_alg); 535 536 /* Check the set of algorithms */ 537 if (!essiv_supported_algorithms(ictx->essiv_cipher_name, hash_alg, 538 ivsize)) { 539 pr_warn("Unsupported essiv instantiation: essiv(%s,%s)\n", 540 block_base->cra_name, hash_alg->base.cra_name); 541 err = -EINVAL; 542 goto out_free_hash; 543 } 544 545 /* record the driver name so we can instantiate this exact algo later */ 546 strlcpy(ictx->shash_driver_name, hash_alg->base.cra_driver_name, 547 CRYPTO_MAX_ALG_NAME); 548 549 /* Instance fields */ 550 551 err = -ENAMETOOLONG; 552 if (snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, 553 "essiv(%s,%s)", block_base->cra_name, 554 hash_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) 555 goto out_free_hash; 556 if (snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, 557 "essiv(%s,%s)", block_base->cra_driver_name, 558 hash_alg->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 559 goto out_free_hash; 560 561 /* 562 * hash_alg wasn't gotten via crypto_grab*(), so we need to inherit its 563 * flags manually. 564 */ 565 base->cra_flags |= (hash_alg->base.cra_flags & 566 CRYPTO_ALG_INHERITED_FLAGS); 567 base->cra_blocksize = block_base->cra_blocksize; 568 base->cra_ctxsize = sizeof(struct essiv_tfm_ctx); 569 base->cra_alignmask = block_base->cra_alignmask; 570 base->cra_priority = block_base->cra_priority; 571 572 if (type == CRYPTO_ALG_TYPE_SKCIPHER) { 573 skcipher_inst->alg.setkey = essiv_skcipher_setkey; 574 skcipher_inst->alg.encrypt = essiv_skcipher_encrypt; 575 skcipher_inst->alg.decrypt = essiv_skcipher_decrypt; 576 skcipher_inst->alg.init = essiv_skcipher_init_tfm; 577 skcipher_inst->alg.exit = essiv_skcipher_exit_tfm; 578 579 skcipher_inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(skcipher_alg); 580 skcipher_inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(skcipher_alg); 581 skcipher_inst->alg.ivsize = ivsize; 582 skcipher_inst->alg.chunksize = crypto_skcipher_alg_chunksize(skcipher_alg); 583 skcipher_inst->alg.walksize = crypto_skcipher_alg_walksize(skcipher_alg); 584 585 skcipher_inst->free = essiv_skcipher_free_instance; 586 587 err = skcipher_register_instance(tmpl, skcipher_inst); 588 } else { 589 aead_inst->alg.setkey = essiv_aead_setkey; 590 aead_inst->alg.setauthsize = essiv_aead_setauthsize; 591 aead_inst->alg.encrypt = essiv_aead_encrypt; 592 aead_inst->alg.decrypt = essiv_aead_decrypt; 593 aead_inst->alg.init = essiv_aead_init_tfm; 594 aead_inst->alg.exit = essiv_aead_exit_tfm; 595 596 aead_inst->alg.ivsize = ivsize; 597 aead_inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(aead_alg); 598 aead_inst->alg.chunksize = crypto_aead_alg_chunksize(aead_alg); 599 600 aead_inst->free = essiv_aead_free_instance; 601 602 err = aead_register_instance(tmpl, aead_inst); 603 } 604 605 if (err) 606 goto out_free_hash; 607 608 crypto_mod_put(_hash_alg); 609 return 0; 610 611 out_free_hash: 612 crypto_mod_put(_hash_alg); 613 out_drop_skcipher: 614 if (type == CRYPTO_ALG_TYPE_SKCIPHER) 615 crypto_drop_skcipher(&ictx->u.skcipher_spawn); 616 else 617 crypto_drop_aead(&ictx->u.aead_spawn); 618 out_free_inst: 619 kfree(skcipher_inst); 620 kfree(aead_inst); 621 return err; 622 } 623 624 /* essiv(cipher_name, shash_name) */ 625 static struct crypto_template essiv_tmpl = { 626 .name = "essiv", 627 .create = essiv_create, 628 .module = THIS_MODULE, 629 }; 630 631 static int __init essiv_module_init(void) 632 { 633 return crypto_register_template(&essiv_tmpl); 634 } 635 636 static void __exit essiv_module_exit(void) 637 { 638 crypto_unregister_template(&essiv_tmpl); 639 } 640 641 subsys_initcall(essiv_module_init); 642 module_exit(essiv_module_exit); 643 644 MODULE_DESCRIPTION("ESSIV skcipher/aead wrapper for block encryption"); 645 MODULE_LICENSE("GPL v2"); 646 MODULE_ALIAS_CRYPTO("essiv"); 647 MODULE_IMPORT_NS(CRYPTO_INTERNAL); 648