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 memcpy(ivs, req->iv, ivsize); 216 217 flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP; 218 219 if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT) 220 flags |= CRYPTO_LSKCIPHER_FLAG_CONT; 221 222 if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL)) 223 flags |= CRYPTO_LSKCIPHER_FLAG_FINAL; 224 225 err = skcipher_walk_virt(&walk, req, false); 226 227 while (walk.nbytes) { 228 err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr, 229 walk.nbytes, ivs, 230 flags & ~(walk.nbytes == walk.total ? 231 0 : CRYPTO_LSKCIPHER_FLAG_FINAL)); 232 err = skcipher_walk_done(&walk, err); 233 flags |= CRYPTO_LSKCIPHER_FLAG_CONT; 234 } 235 236 memcpy(req->iv, ivs, ivsize); 237 238 return err; 239 } 240 241 int crypto_lskcipher_encrypt_sg(struct skcipher_request *req) 242 { 243 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 244 struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); 245 struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx); 246 247 return crypto_lskcipher_crypt_sg(req, alg->encrypt); 248 } 249 250 int crypto_lskcipher_decrypt_sg(struct skcipher_request *req) 251 { 252 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 253 struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); 254 struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx); 255 256 return crypto_lskcipher_crypt_sg(req, alg->decrypt); 257 } 258 259 static void crypto_lskcipher_exit_tfm(struct crypto_tfm *tfm) 260 { 261 struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm); 262 struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher); 263 264 alg->exit(skcipher); 265 } 266 267 static int crypto_lskcipher_init_tfm(struct crypto_tfm *tfm) 268 { 269 struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm); 270 struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher); 271 272 if (alg->exit) 273 skcipher->base.exit = crypto_lskcipher_exit_tfm; 274 275 if (alg->init) 276 return alg->init(skcipher); 277 278 return 0; 279 } 280 281 static void crypto_lskcipher_free_instance(struct crypto_instance *inst) 282 { 283 struct lskcipher_instance *skcipher = 284 container_of(inst, struct lskcipher_instance, s.base); 285 286 skcipher->free(skcipher); 287 } 288 289 static void __maybe_unused crypto_lskcipher_show( 290 struct seq_file *m, struct crypto_alg *alg) 291 { 292 struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); 293 294 seq_printf(m, "type : lskcipher\n"); 295 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); 296 seq_printf(m, "min keysize : %u\n", skcipher->co.min_keysize); 297 seq_printf(m, "max keysize : %u\n", skcipher->co.max_keysize); 298 seq_printf(m, "ivsize : %u\n", skcipher->co.ivsize); 299 seq_printf(m, "chunksize : %u\n", skcipher->co.chunksize); 300 seq_printf(m, "statesize : %u\n", skcipher->co.statesize); 301 } 302 303 static int __maybe_unused crypto_lskcipher_report( 304 struct sk_buff *skb, struct crypto_alg *alg) 305 { 306 struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); 307 struct crypto_report_blkcipher rblkcipher; 308 309 memset(&rblkcipher, 0, sizeof(rblkcipher)); 310 311 strscpy(rblkcipher.type, "lskcipher", sizeof(rblkcipher.type)); 312 strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); 313 314 rblkcipher.blocksize = alg->cra_blocksize; 315 rblkcipher.min_keysize = skcipher->co.min_keysize; 316 rblkcipher.max_keysize = skcipher->co.max_keysize; 317 rblkcipher.ivsize = skcipher->co.ivsize; 318 319 return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, 320 sizeof(rblkcipher), &rblkcipher); 321 } 322 323 static int __maybe_unused crypto_lskcipher_report_stat( 324 struct sk_buff *skb, struct crypto_alg *alg) 325 { 326 struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); 327 struct crypto_istat_cipher *istat; 328 struct crypto_stat_cipher rcipher; 329 330 istat = lskcipher_get_stat(skcipher); 331 332 memset(&rcipher, 0, sizeof(rcipher)); 333 334 strscpy(rcipher.type, "cipher", sizeof(rcipher.type)); 335 336 rcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt); 337 rcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen); 338 rcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt); 339 rcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen); 340 rcipher.stat_err_cnt = atomic64_read(&istat->err_cnt); 341 342 return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher); 343 } 344 345 static const struct crypto_type crypto_lskcipher_type = { 346 .extsize = crypto_alg_extsize, 347 .init_tfm = crypto_lskcipher_init_tfm, 348 .free = crypto_lskcipher_free_instance, 349 #ifdef CONFIG_PROC_FS 350 .show = crypto_lskcipher_show, 351 #endif 352 #if IS_ENABLED(CONFIG_CRYPTO_USER) 353 .report = crypto_lskcipher_report, 354 #endif 355 #ifdef CONFIG_CRYPTO_STATS 356 .report_stat = crypto_lskcipher_report_stat, 357 #endif 358 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 359 .maskset = CRYPTO_ALG_TYPE_MASK, 360 .type = CRYPTO_ALG_TYPE_LSKCIPHER, 361 .tfmsize = offsetof(struct crypto_lskcipher, base), 362 }; 363 364 static void crypto_lskcipher_exit_tfm_sg(struct crypto_tfm *tfm) 365 { 366 struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm); 367 368 crypto_free_lskcipher(*ctx); 369 } 370 371 int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm) 372 { 373 struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm); 374 struct crypto_alg *calg = tfm->__crt_alg; 375 struct crypto_lskcipher *skcipher; 376 377 if (!crypto_mod_get(calg)) 378 return -EAGAIN; 379 380 skcipher = crypto_create_tfm(calg, &crypto_lskcipher_type); 381 if (IS_ERR(skcipher)) { 382 crypto_mod_put(calg); 383 return PTR_ERR(skcipher); 384 } 385 386 *ctx = skcipher; 387 tfm->exit = crypto_lskcipher_exit_tfm_sg; 388 389 return 0; 390 } 391 392 int crypto_grab_lskcipher(struct crypto_lskcipher_spawn *spawn, 393 struct crypto_instance *inst, 394 const char *name, u32 type, u32 mask) 395 { 396 spawn->base.frontend = &crypto_lskcipher_type; 397 return crypto_grab_spawn(&spawn->base, inst, name, type, mask); 398 } 399 EXPORT_SYMBOL_GPL(crypto_grab_lskcipher); 400 401 struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name, 402 u32 type, u32 mask) 403 { 404 return crypto_alloc_tfm(alg_name, &crypto_lskcipher_type, type, mask); 405 } 406 EXPORT_SYMBOL_GPL(crypto_alloc_lskcipher); 407 408 static int lskcipher_prepare_alg(struct lskcipher_alg *alg) 409 { 410 struct crypto_alg *base = &alg->co.base; 411 int err; 412 413 err = skcipher_prepare_alg_common(&alg->co); 414 if (err) 415 return err; 416 417 if (alg->co.chunksize & (alg->co.chunksize - 1)) 418 return -EINVAL; 419 420 base->cra_type = &crypto_lskcipher_type; 421 base->cra_flags |= CRYPTO_ALG_TYPE_LSKCIPHER; 422 423 return 0; 424 } 425 426 int crypto_register_lskcipher(struct lskcipher_alg *alg) 427 { 428 struct crypto_alg *base = &alg->co.base; 429 int err; 430 431 err = lskcipher_prepare_alg(alg); 432 if (err) 433 return err; 434 435 return crypto_register_alg(base); 436 } 437 EXPORT_SYMBOL_GPL(crypto_register_lskcipher); 438 439 void crypto_unregister_lskcipher(struct lskcipher_alg *alg) 440 { 441 crypto_unregister_alg(&alg->co.base); 442 } 443 EXPORT_SYMBOL_GPL(crypto_unregister_lskcipher); 444 445 int crypto_register_lskciphers(struct lskcipher_alg *algs, int count) 446 { 447 int i, ret; 448 449 for (i = 0; i < count; i++) { 450 ret = crypto_register_lskcipher(&algs[i]); 451 if (ret) 452 goto err; 453 } 454 455 return 0; 456 457 err: 458 for (--i; i >= 0; --i) 459 crypto_unregister_lskcipher(&algs[i]); 460 461 return ret; 462 } 463 EXPORT_SYMBOL_GPL(crypto_register_lskciphers); 464 465 void crypto_unregister_lskciphers(struct lskcipher_alg *algs, int count) 466 { 467 int i; 468 469 for (i = count - 1; i >= 0; --i) 470 crypto_unregister_lskcipher(&algs[i]); 471 } 472 EXPORT_SYMBOL_GPL(crypto_unregister_lskciphers); 473 474 int lskcipher_register_instance(struct crypto_template *tmpl, 475 struct lskcipher_instance *inst) 476 { 477 int err; 478 479 if (WARN_ON(!inst->free)) 480 return -EINVAL; 481 482 err = lskcipher_prepare_alg(&inst->alg); 483 if (err) 484 return err; 485 486 return crypto_register_instance(tmpl, lskcipher_crypto_instance(inst)); 487 } 488 EXPORT_SYMBOL_GPL(lskcipher_register_instance); 489 490 static int lskcipher_setkey_simple(struct crypto_lskcipher *tfm, const u8 *key, 491 unsigned int keylen) 492 { 493 struct crypto_lskcipher *cipher = lskcipher_cipher_simple(tfm); 494 495 crypto_lskcipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); 496 crypto_lskcipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) & 497 CRYPTO_TFM_REQ_MASK); 498 return crypto_lskcipher_setkey(cipher, key, keylen); 499 } 500 501 static int lskcipher_init_tfm_simple(struct crypto_lskcipher *tfm) 502 { 503 struct lskcipher_instance *inst = lskcipher_alg_instance(tfm); 504 struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); 505 struct crypto_lskcipher_spawn *spawn; 506 struct crypto_lskcipher *cipher; 507 508 spawn = lskcipher_instance_ctx(inst); 509 cipher = crypto_spawn_lskcipher(spawn); 510 if (IS_ERR(cipher)) 511 return PTR_ERR(cipher); 512 513 *ctx = cipher; 514 return 0; 515 } 516 517 static void lskcipher_exit_tfm_simple(struct crypto_lskcipher *tfm) 518 { 519 struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); 520 521 crypto_free_lskcipher(*ctx); 522 } 523 524 static void lskcipher_free_instance_simple(struct lskcipher_instance *inst) 525 { 526 crypto_drop_lskcipher(lskcipher_instance_ctx(inst)); 527 kfree(inst); 528 } 529 530 /** 531 * lskcipher_alloc_instance_simple - allocate instance of simple block cipher 532 * 533 * Allocate an lskcipher_instance for a simple block cipher mode of operation, 534 * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, 535 * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, 536 * alignmask, and priority are set from the underlying cipher but can be 537 * overridden if needed. The tfm context defaults to 538 * struct crypto_lskcipher *, and default ->setkey(), ->init(), and 539 * ->exit() methods are installed. 540 * 541 * @tmpl: the template being instantiated 542 * @tb: the template parameters 543 * 544 * Return: a pointer to the new instance, or an ERR_PTR(). The caller still 545 * needs to register the instance. 546 */ 547 struct lskcipher_instance *lskcipher_alloc_instance_simple( 548 struct crypto_template *tmpl, struct rtattr **tb) 549 { 550 u32 mask; 551 struct lskcipher_instance *inst; 552 struct crypto_lskcipher_spawn *spawn; 553 char ecb_name[CRYPTO_MAX_ALG_NAME]; 554 struct lskcipher_alg *cipher_alg; 555 const char *cipher_name; 556 int err; 557 558 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask); 559 if (err) 560 return ERR_PTR(err); 561 562 cipher_name = crypto_attr_alg_name(tb[1]); 563 if (IS_ERR(cipher_name)) 564 return ERR_CAST(cipher_name); 565 566 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 567 if (!inst) 568 return ERR_PTR(-ENOMEM); 569 570 spawn = lskcipher_instance_ctx(inst); 571 err = crypto_grab_lskcipher(spawn, 572 lskcipher_crypto_instance(inst), 573 cipher_name, 0, mask); 574 575 ecb_name[0] = 0; 576 if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) { 577 err = -ENAMETOOLONG; 578 if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)", 579 cipher_name) >= CRYPTO_MAX_ALG_NAME) 580 goto err_free_inst; 581 582 err = crypto_grab_lskcipher(spawn, 583 lskcipher_crypto_instance(inst), 584 ecb_name, 0, mask); 585 } 586 587 if (err) 588 goto err_free_inst; 589 590 cipher_alg = crypto_lskcipher_spawn_alg(spawn); 591 592 err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name, 593 &cipher_alg->co.base); 594 if (err) 595 goto err_free_inst; 596 597 if (ecb_name[0]) { 598 int len; 599 600 err = -EINVAL; 601 len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4], 602 sizeof(ecb_name)); 603 if (len < 2) 604 goto err_free_inst; 605 606 if (ecb_name[len - 1] != ')') 607 goto err_free_inst; 608 609 ecb_name[len - 1] = 0; 610 611 err = -ENAMETOOLONG; 612 if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME, 613 "%s(%s)", tmpl->name, ecb_name) >= 614 CRYPTO_MAX_ALG_NAME) 615 goto err_free_inst; 616 617 if (strcmp(ecb_name, cipher_name) && 618 snprintf(inst->alg.co.base.cra_driver_name, 619 CRYPTO_MAX_ALG_NAME, 620 "%s(%s)", tmpl->name, cipher_name) >= 621 CRYPTO_MAX_ALG_NAME) 622 goto err_free_inst; 623 } else { 624 /* Don't allow nesting. */ 625 err = -ELOOP; 626 if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE)) 627 goto err_free_inst; 628 } 629 630 err = -EINVAL; 631 if (cipher_alg->co.ivsize) 632 goto err_free_inst; 633 634 inst->free = lskcipher_free_instance_simple; 635 636 /* Default algorithm properties, can be overridden */ 637 inst->alg.co.base.cra_blocksize = cipher_alg->co.base.cra_blocksize; 638 inst->alg.co.base.cra_alignmask = cipher_alg->co.base.cra_alignmask; 639 inst->alg.co.base.cra_priority = cipher_alg->co.base.cra_priority; 640 inst->alg.co.min_keysize = cipher_alg->co.min_keysize; 641 inst->alg.co.max_keysize = cipher_alg->co.max_keysize; 642 inst->alg.co.ivsize = cipher_alg->co.base.cra_blocksize; 643 inst->alg.co.statesize = cipher_alg->co.statesize; 644 645 /* Use struct crypto_lskcipher * by default, can be overridden */ 646 inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_lskcipher *); 647 inst->alg.setkey = lskcipher_setkey_simple; 648 inst->alg.init = lskcipher_init_tfm_simple; 649 inst->alg.exit = lskcipher_exit_tfm_simple; 650 651 return inst; 652 653 err_free_inst: 654 lskcipher_free_instance_simple(inst); 655 return ERR_PTR(err); 656 } 657 EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple); 658