1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linear symmetric key cipher operations. 4 * 5 * Generic encrypt/decrypt wrapper for ciphers. 6 * 7 * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au> 8 */ 9 10 #include <linux/cryptouser.h> 11 #include <linux/err.h> 12 #include <linux/export.h> 13 #include <linux/kernel.h> 14 #include <linux/seq_file.h> 15 #include <linux/slab.h> 16 #include <linux/string.h> 17 #include <net/netlink.h> 18 #include "skcipher.h" 19 20 static inline struct crypto_lskcipher *__crypto_lskcipher_cast( 21 struct crypto_tfm *tfm) 22 { 23 return container_of(tfm, struct crypto_lskcipher, base); 24 } 25 26 static inline struct lskcipher_alg *__crypto_lskcipher_alg( 27 struct crypto_alg *alg) 28 { 29 return container_of(alg, struct lskcipher_alg, co.base); 30 } 31 32 static inline struct crypto_istat_cipher *lskcipher_get_stat( 33 struct lskcipher_alg *alg) 34 { 35 return skcipher_get_stat_common(&alg->co); 36 } 37 38 static inline int crypto_lskcipher_errstat(struct lskcipher_alg *alg, int err) 39 { 40 struct crypto_istat_cipher *istat = lskcipher_get_stat(alg); 41 42 if (!IS_ENABLED(CONFIG_CRYPTO_STATS)) 43 return err; 44 45 if (err) 46 atomic64_inc(&istat->err_cnt); 47 48 return err; 49 } 50 51 static int lskcipher_setkey_unaligned(struct crypto_lskcipher *tfm, 52 const u8 *key, unsigned int keylen) 53 { 54 unsigned long alignmask = crypto_lskcipher_alignmask(tfm); 55 struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm); 56 u8 *buffer, *alignbuffer; 57 unsigned long absize; 58 int ret; 59 60 absize = keylen + alignmask; 61 buffer = kmalloc(absize, GFP_ATOMIC); 62 if (!buffer) 63 return -ENOMEM; 64 65 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); 66 memcpy(alignbuffer, key, keylen); 67 ret = cipher->setkey(tfm, alignbuffer, keylen); 68 kfree_sensitive(buffer); 69 return ret; 70 } 71 72 int crypto_lskcipher_setkey(struct crypto_lskcipher *tfm, const u8 *key, 73 unsigned int keylen) 74 { 75 unsigned long alignmask = crypto_lskcipher_alignmask(tfm); 76 struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm); 77 78 if (keylen < cipher->co.min_keysize || keylen > cipher->co.max_keysize) 79 return -EINVAL; 80 81 if ((unsigned long)key & alignmask) 82 return lskcipher_setkey_unaligned(tfm, key, keylen); 83 else 84 return cipher->setkey(tfm, key, keylen); 85 } 86 EXPORT_SYMBOL_GPL(crypto_lskcipher_setkey); 87 88 static int crypto_lskcipher_crypt_unaligned( 89 struct crypto_lskcipher *tfm, const u8 *src, u8 *dst, unsigned len, 90 u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src, 91 u8 *dst, unsigned len, u8 *iv, u32 flags)) 92 { 93 unsigned statesize = crypto_lskcipher_statesize(tfm); 94 unsigned ivsize = crypto_lskcipher_ivsize(tfm); 95 unsigned bs = crypto_lskcipher_blocksize(tfm); 96 unsigned cs = crypto_lskcipher_chunksize(tfm); 97 int err; 98 u8 *tiv; 99 u8 *p; 100 101 BUILD_BUG_ON(MAX_CIPHER_BLOCKSIZE > PAGE_SIZE || 102 MAX_CIPHER_ALIGNMASK >= PAGE_SIZE); 103 104 tiv = kmalloc(PAGE_SIZE, GFP_ATOMIC); 105 if (!tiv) 106 return -ENOMEM; 107 108 memcpy(tiv, iv, ivsize + statesize); 109 110 p = kmalloc(PAGE_SIZE, GFP_ATOMIC); 111 err = -ENOMEM; 112 if (!p) 113 goto out; 114 115 while (len >= bs) { 116 unsigned chunk = min((unsigned)PAGE_SIZE, len); 117 int err; 118 119 if (chunk > cs) 120 chunk &= ~(cs - 1); 121 122 memcpy(p, src, chunk); 123 err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL); 124 if (err) 125 goto out; 126 127 memcpy(dst, p, chunk); 128 src += chunk; 129 dst += chunk; 130 len -= chunk; 131 } 132 133 err = len ? -EINVAL : 0; 134 135 out: 136 memcpy(iv, tiv, ivsize + statesize); 137 kfree_sensitive(p); 138 kfree_sensitive(tiv); 139 return err; 140 } 141 142 static int crypto_lskcipher_crypt(struct crypto_lskcipher *tfm, const u8 *src, 143 u8 *dst, unsigned len, u8 *iv, 144 int (*crypt)(struct crypto_lskcipher *tfm, 145 const u8 *src, u8 *dst, 146 unsigned len, u8 *iv, 147 u32 flags)) 148 { 149 unsigned long alignmask = crypto_lskcipher_alignmask(tfm); 150 struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm); 151 int ret; 152 153 if (((unsigned long)src | (unsigned long)dst | (unsigned long)iv) & 154 alignmask) { 155 ret = crypto_lskcipher_crypt_unaligned(tfm, src, dst, len, iv, 156 crypt); 157 goto out; 158 } 159 160 ret = crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL); 161 162 out: 163 return crypto_lskcipher_errstat(alg, ret); 164 } 165 166 int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src, 167 u8 *dst, unsigned len, u8 *iv) 168 { 169 struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm); 170 171 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { 172 struct crypto_istat_cipher *istat = lskcipher_get_stat(alg); 173 174 atomic64_inc(&istat->encrypt_cnt); 175 atomic64_add(len, &istat->encrypt_tlen); 176 } 177 178 return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->encrypt); 179 } 180 EXPORT_SYMBOL_GPL(crypto_lskcipher_encrypt); 181 182 int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src, 183 u8 *dst, unsigned len, u8 *iv) 184 { 185 struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm); 186 187 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { 188 struct crypto_istat_cipher *istat = lskcipher_get_stat(alg); 189 190 atomic64_inc(&istat->decrypt_cnt); 191 atomic64_add(len, &istat->decrypt_tlen); 192 } 193 194 return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->decrypt); 195 } 196 EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt); 197 198 static int crypto_lskcipher_crypt_sg(struct skcipher_request *req, 199 int (*crypt)(struct crypto_lskcipher *tfm, 200 const u8 *src, u8 *dst, 201 unsigned len, u8 *ivs, 202 u32 flags)) 203 { 204 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 205 struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); 206 u8 *ivs = skcipher_request_ctx(req); 207 struct crypto_lskcipher *tfm = *ctx; 208 struct skcipher_walk walk; 209 unsigned ivsize; 210 u32 flags; 211 int err; 212 213 ivsize = crypto_lskcipher_ivsize(tfm); 214 ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1); 215 216 flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP; 217 218 if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT) 219 flags |= CRYPTO_LSKCIPHER_FLAG_CONT; 220 else 221 memcpy(ivs, req->iv, ivsize); 222 223 if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL)) 224 flags |= CRYPTO_LSKCIPHER_FLAG_FINAL; 225 226 err = skcipher_walk_virt(&walk, req, false); 227 228 while (walk.nbytes) { 229 err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr, 230 walk.nbytes, ivs, 231 flags & ~(walk.nbytes == walk.total ? 232 0 : CRYPTO_LSKCIPHER_FLAG_FINAL)); 233 err = skcipher_walk_done(&walk, err); 234 flags |= CRYPTO_LSKCIPHER_FLAG_CONT; 235 } 236 237 if (flags & CRYPTO_LSKCIPHER_FLAG_FINAL) 238 memcpy(req->iv, ivs, ivsize); 239 240 return err; 241 } 242 243 int crypto_lskcipher_encrypt_sg(struct skcipher_request *req) 244 { 245 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 246 struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); 247 struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx); 248 249 return crypto_lskcipher_crypt_sg(req, alg->encrypt); 250 } 251 252 int crypto_lskcipher_decrypt_sg(struct skcipher_request *req) 253 { 254 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 255 struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); 256 struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx); 257 258 return crypto_lskcipher_crypt_sg(req, alg->decrypt); 259 } 260 261 static void crypto_lskcipher_exit_tfm(struct crypto_tfm *tfm) 262 { 263 struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm); 264 struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher); 265 266 alg->exit(skcipher); 267 } 268 269 static int crypto_lskcipher_init_tfm(struct crypto_tfm *tfm) 270 { 271 struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm); 272 struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher); 273 274 if (alg->exit) 275 skcipher->base.exit = crypto_lskcipher_exit_tfm; 276 277 if (alg->init) 278 return alg->init(skcipher); 279 280 return 0; 281 } 282 283 static void crypto_lskcipher_free_instance(struct crypto_instance *inst) 284 { 285 struct lskcipher_instance *skcipher = 286 container_of(inst, struct lskcipher_instance, s.base); 287 288 skcipher->free(skcipher); 289 } 290 291 static void __maybe_unused crypto_lskcipher_show( 292 struct seq_file *m, struct crypto_alg *alg) 293 { 294 struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); 295 296 seq_printf(m, "type : lskcipher\n"); 297 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); 298 seq_printf(m, "min keysize : %u\n", skcipher->co.min_keysize); 299 seq_printf(m, "max keysize : %u\n", skcipher->co.max_keysize); 300 seq_printf(m, "ivsize : %u\n", skcipher->co.ivsize); 301 seq_printf(m, "chunksize : %u\n", skcipher->co.chunksize); 302 seq_printf(m, "statesize : %u\n", skcipher->co.statesize); 303 } 304 305 static int __maybe_unused crypto_lskcipher_report( 306 struct sk_buff *skb, struct crypto_alg *alg) 307 { 308 struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); 309 struct crypto_report_blkcipher rblkcipher; 310 311 memset(&rblkcipher, 0, sizeof(rblkcipher)); 312 313 strscpy(rblkcipher.type, "lskcipher", sizeof(rblkcipher.type)); 314 strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); 315 316 rblkcipher.blocksize = alg->cra_blocksize; 317 rblkcipher.min_keysize = skcipher->co.min_keysize; 318 rblkcipher.max_keysize = skcipher->co.max_keysize; 319 rblkcipher.ivsize = skcipher->co.ivsize; 320 321 return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, 322 sizeof(rblkcipher), &rblkcipher); 323 } 324 325 static int __maybe_unused crypto_lskcipher_report_stat( 326 struct sk_buff *skb, struct crypto_alg *alg) 327 { 328 struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); 329 struct crypto_istat_cipher *istat; 330 struct crypto_stat_cipher rcipher; 331 332 istat = lskcipher_get_stat(skcipher); 333 334 memset(&rcipher, 0, sizeof(rcipher)); 335 336 strscpy(rcipher.type, "cipher", sizeof(rcipher.type)); 337 338 rcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt); 339 rcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen); 340 rcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt); 341 rcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen); 342 rcipher.stat_err_cnt = atomic64_read(&istat->err_cnt); 343 344 return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher); 345 } 346 347 static const struct crypto_type crypto_lskcipher_type = { 348 .extsize = crypto_alg_extsize, 349 .init_tfm = crypto_lskcipher_init_tfm, 350 .free = crypto_lskcipher_free_instance, 351 #ifdef CONFIG_PROC_FS 352 .show = crypto_lskcipher_show, 353 #endif 354 #if IS_ENABLED(CONFIG_CRYPTO_USER) 355 .report = crypto_lskcipher_report, 356 #endif 357 #ifdef CONFIG_CRYPTO_STATS 358 .report_stat = crypto_lskcipher_report_stat, 359 #endif 360 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 361 .maskset = CRYPTO_ALG_TYPE_MASK, 362 .type = CRYPTO_ALG_TYPE_LSKCIPHER, 363 .tfmsize = offsetof(struct crypto_lskcipher, base), 364 }; 365 366 static void crypto_lskcipher_exit_tfm_sg(struct crypto_tfm *tfm) 367 { 368 struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm); 369 370 crypto_free_lskcipher(*ctx); 371 } 372 373 int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm) 374 { 375 struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm); 376 struct crypto_alg *calg = tfm->__crt_alg; 377 struct crypto_lskcipher *skcipher; 378 379 if (!crypto_mod_get(calg)) 380 return -EAGAIN; 381 382 skcipher = crypto_create_tfm(calg, &crypto_lskcipher_type); 383 if (IS_ERR(skcipher)) { 384 crypto_mod_put(calg); 385 return PTR_ERR(skcipher); 386 } 387 388 *ctx = skcipher; 389 tfm->exit = crypto_lskcipher_exit_tfm_sg; 390 391 return 0; 392 } 393 394 int crypto_grab_lskcipher(struct crypto_lskcipher_spawn *spawn, 395 struct crypto_instance *inst, 396 const char *name, u32 type, u32 mask) 397 { 398 spawn->base.frontend = &crypto_lskcipher_type; 399 return crypto_grab_spawn(&spawn->base, inst, name, type, mask); 400 } 401 EXPORT_SYMBOL_GPL(crypto_grab_lskcipher); 402 403 struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name, 404 u32 type, u32 mask) 405 { 406 return crypto_alloc_tfm(alg_name, &crypto_lskcipher_type, type, mask); 407 } 408 EXPORT_SYMBOL_GPL(crypto_alloc_lskcipher); 409 410 static int lskcipher_prepare_alg(struct lskcipher_alg *alg) 411 { 412 struct crypto_alg *base = &alg->co.base; 413 int err; 414 415 err = skcipher_prepare_alg_common(&alg->co); 416 if (err) 417 return err; 418 419 if (alg->co.chunksize & (alg->co.chunksize - 1)) 420 return -EINVAL; 421 422 base->cra_type = &crypto_lskcipher_type; 423 base->cra_flags |= CRYPTO_ALG_TYPE_LSKCIPHER; 424 425 return 0; 426 } 427 428 int crypto_register_lskcipher(struct lskcipher_alg *alg) 429 { 430 struct crypto_alg *base = &alg->co.base; 431 int err; 432 433 err = lskcipher_prepare_alg(alg); 434 if (err) 435 return err; 436 437 return crypto_register_alg(base); 438 } 439 EXPORT_SYMBOL_GPL(crypto_register_lskcipher); 440 441 void crypto_unregister_lskcipher(struct lskcipher_alg *alg) 442 { 443 crypto_unregister_alg(&alg->co.base); 444 } 445 EXPORT_SYMBOL_GPL(crypto_unregister_lskcipher); 446 447 int crypto_register_lskciphers(struct lskcipher_alg *algs, int count) 448 { 449 int i, ret; 450 451 for (i = 0; i < count; i++) { 452 ret = crypto_register_lskcipher(&algs[i]); 453 if (ret) 454 goto err; 455 } 456 457 return 0; 458 459 err: 460 for (--i; i >= 0; --i) 461 crypto_unregister_lskcipher(&algs[i]); 462 463 return ret; 464 } 465 EXPORT_SYMBOL_GPL(crypto_register_lskciphers); 466 467 void crypto_unregister_lskciphers(struct lskcipher_alg *algs, int count) 468 { 469 int i; 470 471 for (i = count - 1; i >= 0; --i) 472 crypto_unregister_lskcipher(&algs[i]); 473 } 474 EXPORT_SYMBOL_GPL(crypto_unregister_lskciphers); 475 476 int lskcipher_register_instance(struct crypto_template *tmpl, 477 struct lskcipher_instance *inst) 478 { 479 int err; 480 481 if (WARN_ON(!inst->free)) 482 return -EINVAL; 483 484 err = lskcipher_prepare_alg(&inst->alg); 485 if (err) 486 return err; 487 488 return crypto_register_instance(tmpl, lskcipher_crypto_instance(inst)); 489 } 490 EXPORT_SYMBOL_GPL(lskcipher_register_instance); 491 492 static int lskcipher_setkey_simple(struct crypto_lskcipher *tfm, const u8 *key, 493 unsigned int keylen) 494 { 495 struct crypto_lskcipher *cipher = lskcipher_cipher_simple(tfm); 496 497 crypto_lskcipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); 498 crypto_lskcipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) & 499 CRYPTO_TFM_REQ_MASK); 500 return crypto_lskcipher_setkey(cipher, key, keylen); 501 } 502 503 static int lskcipher_init_tfm_simple(struct crypto_lskcipher *tfm) 504 { 505 struct lskcipher_instance *inst = lskcipher_alg_instance(tfm); 506 struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); 507 struct crypto_lskcipher_spawn *spawn; 508 struct crypto_lskcipher *cipher; 509 510 spawn = lskcipher_instance_ctx(inst); 511 cipher = crypto_spawn_lskcipher(spawn); 512 if (IS_ERR(cipher)) 513 return PTR_ERR(cipher); 514 515 *ctx = cipher; 516 return 0; 517 } 518 519 static void lskcipher_exit_tfm_simple(struct crypto_lskcipher *tfm) 520 { 521 struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); 522 523 crypto_free_lskcipher(*ctx); 524 } 525 526 static void lskcipher_free_instance_simple(struct lskcipher_instance *inst) 527 { 528 crypto_drop_lskcipher(lskcipher_instance_ctx(inst)); 529 kfree(inst); 530 } 531 532 /** 533 * lskcipher_alloc_instance_simple - allocate instance of simple block cipher 534 * 535 * Allocate an lskcipher_instance for a simple block cipher mode of operation, 536 * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, 537 * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, 538 * alignmask, and priority are set from the underlying cipher but can be 539 * overridden if needed. The tfm context defaults to 540 * struct crypto_lskcipher *, and default ->setkey(), ->init(), and 541 * ->exit() methods are installed. 542 * 543 * @tmpl: the template being instantiated 544 * @tb: the template parameters 545 * 546 * Return: a pointer to the new instance, or an ERR_PTR(). The caller still 547 * needs to register the instance. 548 */ 549 struct lskcipher_instance *lskcipher_alloc_instance_simple( 550 struct crypto_template *tmpl, struct rtattr **tb) 551 { 552 u32 mask; 553 struct lskcipher_instance *inst; 554 struct crypto_lskcipher_spawn *spawn; 555 char ecb_name[CRYPTO_MAX_ALG_NAME]; 556 struct lskcipher_alg *cipher_alg; 557 const char *cipher_name; 558 int err; 559 560 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask); 561 if (err) 562 return ERR_PTR(err); 563 564 cipher_name = crypto_attr_alg_name(tb[1]); 565 if (IS_ERR(cipher_name)) 566 return ERR_CAST(cipher_name); 567 568 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 569 if (!inst) 570 return ERR_PTR(-ENOMEM); 571 572 spawn = lskcipher_instance_ctx(inst); 573 err = crypto_grab_lskcipher(spawn, 574 lskcipher_crypto_instance(inst), 575 cipher_name, 0, mask); 576 577 ecb_name[0] = 0; 578 if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) { 579 err = -ENAMETOOLONG; 580 if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)", 581 cipher_name) >= CRYPTO_MAX_ALG_NAME) 582 goto err_free_inst; 583 584 err = crypto_grab_lskcipher(spawn, 585 lskcipher_crypto_instance(inst), 586 ecb_name, 0, mask); 587 } 588 589 if (err) 590 goto err_free_inst; 591 592 cipher_alg = crypto_lskcipher_spawn_alg(spawn); 593 594 err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name, 595 &cipher_alg->co.base); 596 if (err) 597 goto err_free_inst; 598 599 if (ecb_name[0]) { 600 int len; 601 602 err = -EINVAL; 603 len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4], 604 sizeof(ecb_name)); 605 if (len < 2) 606 goto err_free_inst; 607 608 if (ecb_name[len - 1] != ')') 609 goto err_free_inst; 610 611 ecb_name[len - 1] = 0; 612 613 err = -ENAMETOOLONG; 614 if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME, 615 "%s(%s)", tmpl->name, ecb_name) >= 616 CRYPTO_MAX_ALG_NAME) 617 goto err_free_inst; 618 619 if (strcmp(ecb_name, cipher_name) && 620 snprintf(inst->alg.co.base.cra_driver_name, 621 CRYPTO_MAX_ALG_NAME, 622 "%s(%s)", tmpl->name, cipher_name) >= 623 CRYPTO_MAX_ALG_NAME) 624 goto err_free_inst; 625 } else { 626 /* Don't allow nesting. */ 627 err = -ELOOP; 628 if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE)) 629 goto err_free_inst; 630 } 631 632 err = -EINVAL; 633 if (cipher_alg->co.ivsize) 634 goto err_free_inst; 635 636 inst->free = lskcipher_free_instance_simple; 637 638 /* Default algorithm properties, can be overridden */ 639 inst->alg.co.base.cra_blocksize = cipher_alg->co.base.cra_blocksize; 640 inst->alg.co.base.cra_alignmask = cipher_alg->co.base.cra_alignmask; 641 inst->alg.co.base.cra_priority = cipher_alg->co.base.cra_priority; 642 inst->alg.co.min_keysize = cipher_alg->co.min_keysize; 643 inst->alg.co.max_keysize = cipher_alg->co.max_keysize; 644 inst->alg.co.ivsize = cipher_alg->co.base.cra_blocksize; 645 inst->alg.co.statesize = cipher_alg->co.statesize; 646 647 /* Use struct crypto_lskcipher * by default, can be overridden */ 648 inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_lskcipher *); 649 inst->alg.setkey = lskcipher_setkey_simple; 650 inst->alg.init = lskcipher_init_tfm_simple; 651 inst->alg.exit = lskcipher_exit_tfm_simple; 652 653 return inst; 654 655 err_free_inst: 656 lskcipher_free_instance_simple(inst); 657 return ERR_PTR(err); 658 } 659 EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple); 660