1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Symmetric key cipher operations. 4 * 5 * Generic encrypt/decrypt wrapper for ciphers, handles operations across 6 * multiple page boundaries by using temporary blocks. In user context, 7 * the kernel is given a chance to schedule us once per page. 8 * 9 * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> 10 */ 11 12#include <crypto/internal/aead.h> 13#include <crypto/internal/cipher.h> 14#include <crypto/internal/skcipher.h> 15#include <crypto/scatterwalk.h> 16#include <linux/bug.h> 17#include <linux/cryptouser.h> 18#include <linux/err.h> 19#include <linux/kernel.h> 20#include <linux/list.h> 21#include <linux/mm.h> 22#include <linux/module.h> 23#include <linux/seq_file.h> 24#include <linux/slab.h> 25#include <linux/string.h> 26#include <net/netlink.h> 27#include "skcipher.h" 28 29#define CRYPTO_ALG_TYPE_SKCIPHER_MASK 0x0000000e 30 31enum { 32 SKCIPHER_WALK_PHYS = 1 << 0, 33 SKCIPHER_WALK_SLOW = 1 << 1, 34 SKCIPHER_WALK_COPY = 1 << 2, 35 SKCIPHER_WALK_DIFF = 1 << 3, 36 SKCIPHER_WALK_SLEEP = 1 << 4, 37}; 38 39struct skcipher_walk_buffer { 40 struct list_head entry; 41 struct scatter_walk dst; 42 unsigned int len; 43 u8 *data; 44 u8 buffer[]; 45}; 46 47static const struct crypto_type crypto_skcipher_type; 48 49static int skcipher_walk_next(struct skcipher_walk *walk); 50 51static inline void skcipher_map_src(struct skcipher_walk *walk) 52{ 53 walk->src.virt.addr = scatterwalk_map(&walk->in); 54} 55 56static inline void skcipher_map_dst(struct skcipher_walk *walk) 57{ 58 walk->dst.virt.addr = scatterwalk_map(&walk->out); 59} 60 61static inline void skcipher_unmap_src(struct skcipher_walk *walk) 62{ 63 scatterwalk_unmap(walk->src.virt.addr); 64} 65 66static inline void skcipher_unmap_dst(struct skcipher_walk *walk) 67{ 68 scatterwalk_unmap(walk->dst.virt.addr); 69} 70 71static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) 72{ 73 return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC; 74} 75 76/* Get a spot of the specified length that does not straddle a page. 77 * The caller needs to ensure that there is enough space for this operation. 78 */ 79static inline u8 *skcipher_get_spot(u8 *start, unsigned int len) 80{ 81 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); 82 83 return max(start, end_page); 84} 85 86static inline struct skcipher_alg *__crypto_skcipher_alg( 87 struct crypto_alg *alg) 88{ 89 return container_of(alg, struct skcipher_alg, base); 90} 91 92static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize) 93{ 94 u8 *addr; 95 96 addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); 97 addr = skcipher_get_spot(addr, bsize); 98 scatterwalk_copychunks(addr, &walk->out, bsize, 99 (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1); 100 return 0; 101} 102 103int skcipher_walk_done(struct skcipher_walk *walk, int err) 104{ 105 unsigned int n = walk->nbytes; 106 unsigned int nbytes = 0; 107 108 if (!n) 109 goto finish; 110 111 if (likely(err >= 0)) { 112 n -= err; 113 nbytes = walk->total - n; 114 } 115 116 if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS | 117 SKCIPHER_WALK_SLOW | 118 SKCIPHER_WALK_COPY | 119 SKCIPHER_WALK_DIFF)))) { 120unmap_src: 121 skcipher_unmap_src(walk); 122 } else if (walk->flags & SKCIPHER_WALK_DIFF) { 123 skcipher_unmap_dst(walk); 124 goto unmap_src; 125 } else if (walk->flags & SKCIPHER_WALK_COPY) { 126 skcipher_map_dst(walk); 127 memcpy(walk->dst.virt.addr, walk->page, n); 128 skcipher_unmap_dst(walk); 129 } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) { 130 if (err > 0) { 131 /* 132 * Didn't process all bytes. Either the algorithm is 133 * broken, or this was the last step and it turned out 134 * the message wasn't evenly divisible into blocks but 135 * the algorithm requires it. 136 */ 137 err = -EINVAL; 138 nbytes = 0; 139 } else 140 n = skcipher_done_slow(walk, n); 141 } 142 143 if (err > 0) 144 err = 0; 145 146 walk->total = nbytes; 147 walk->nbytes = 0; 148 149 scatterwalk_advance(&walk->in, n); 150 scatterwalk_advance(&walk->out, n); 151 scatterwalk_done(&walk->in, 0, nbytes); 152 scatterwalk_done(&walk->out, 1, nbytes); 153 154 if (nbytes) { 155 crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ? 156 CRYPTO_TFM_REQ_MAY_SLEEP : 0); 157 return skcipher_walk_next(walk); 158 } 159 160finish: 161 /* Short-circuit for the common/fast path. */ 162 if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) 163 goto out; 164 165 if (walk->flags & SKCIPHER_WALK_PHYS) 166 goto out; 167 168 if (walk->iv != walk->oiv) 169 memcpy(walk->oiv, walk->iv, walk->ivsize); 170 if (walk->buffer != walk->page) 171 kfree(walk->buffer); 172 if (walk->page) 173 free_page((unsigned long)walk->page); 174 175out: 176 return err; 177} 178EXPORT_SYMBOL_GPL(skcipher_walk_done); 179 180void skcipher_walk_complete(struct skcipher_walk *walk, int err) 181{ 182 struct skcipher_walk_buffer *p, *tmp; 183 184 list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { 185 u8 *data; 186 187 if (err) 188 goto done; 189 190 data = p->data; 191 if (!data) { 192 data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1); 193 data = skcipher_get_spot(data, walk->stride); 194 } 195 196 scatterwalk_copychunks(data, &p->dst, p->len, 1); 197 198 if (offset_in_page(p->data) + p->len + walk->stride > 199 PAGE_SIZE) 200 free_page((unsigned long)p->data); 201 202done: 203 list_del(&p->entry); 204 kfree(p); 205 } 206 207 if (!err && walk->iv != walk->oiv) 208 memcpy(walk->oiv, walk->iv, walk->ivsize); 209 if (walk->buffer != walk->page) 210 kfree(walk->buffer); 211 if (walk->page) 212 free_page((unsigned long)walk->page); 213} 214EXPORT_SYMBOL_GPL(skcipher_walk_complete); 215 216static void skcipher_queue_write(struct skcipher_walk *walk, 217 struct skcipher_walk_buffer *p) 218{ 219 p->dst = walk->out; 220 list_add_tail(&p->entry, &walk->buffers); 221} 222 223static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize) 224{ 225 bool phys = walk->flags & SKCIPHER_WALK_PHYS; 226 unsigned alignmask = walk->alignmask; 227 struct skcipher_walk_buffer *p; 228 unsigned a; 229 unsigned n; 230 u8 *buffer; 231 void *v; 232 233 if (!phys) { 234 if (!walk->buffer) 235 walk->buffer = walk->page; 236 buffer = walk->buffer; 237 if (buffer) 238 goto ok; 239 } 240 241 /* Start with the minimum alignment of kmalloc. */ 242 a = crypto_tfm_ctx_alignment() - 1; 243 n = bsize; 244 245 if (phys) { 246 /* Calculate the minimum alignment of p->buffer. */ 247 a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1; 248 n += sizeof(*p); 249 } 250 251 /* Minimum size to align p->buffer by alignmask. */ 252 n += alignmask & ~a; 253 254 /* Minimum size to ensure p->buffer does not straddle a page. */ 255 n += (bsize - 1) & ~(alignmask | a); 256 257 v = kzalloc(n, skcipher_walk_gfp(walk)); 258 if (!v) 259 return skcipher_walk_done(walk, -ENOMEM); 260 261 if (phys) { 262 p = v; 263 p->len = bsize; 264 skcipher_queue_write(walk, p); 265 buffer = p->buffer; 266 } else { 267 walk->buffer = v; 268 buffer = v; 269 } 270 271ok: 272 walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1); 273 walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize); 274 walk->src.virt.addr = walk->dst.virt.addr; 275 276 scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); 277 278 walk->nbytes = bsize; 279 walk->flags |= SKCIPHER_WALK_SLOW; 280 281 return 0; 282} 283 284static int skcipher_next_copy(struct skcipher_walk *walk) 285{ 286 struct skcipher_walk_buffer *p; 287 u8 *tmp = walk->page; 288 289 skcipher_map_src(walk); 290 memcpy(tmp, walk->src.virt.addr, walk->nbytes); 291 skcipher_unmap_src(walk); 292 293 walk->src.virt.addr = tmp; 294 walk->dst.virt.addr = tmp; 295 296 if (!(walk->flags & SKCIPHER_WALK_PHYS)) 297 return 0; 298 299 p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk)); 300 if (!p) 301 return -ENOMEM; 302 303 p->data = walk->page; 304 p->len = walk->nbytes; 305 skcipher_queue_write(walk, p); 306 307 if (offset_in_page(walk->page) + walk->nbytes + walk->stride > 308 PAGE_SIZE) 309 walk->page = NULL; 310 else 311 walk->page += walk->nbytes; 312 313 return 0; 314} 315 316static int skcipher_next_fast(struct skcipher_walk *walk) 317{ 318 unsigned long diff; 319 320 walk->src.phys.page = scatterwalk_page(&walk->in); 321 walk->src.phys.offset = offset_in_page(walk->in.offset); 322 walk->dst.phys.page = scatterwalk_page(&walk->out); 323 walk->dst.phys.offset = offset_in_page(walk->out.offset); 324 325 if (walk->flags & SKCIPHER_WALK_PHYS) 326 return 0; 327 328 diff = walk->src.phys.offset - walk->dst.phys.offset; 329 diff |= walk->src.virt.page - walk->dst.virt.page; 330 331 skcipher_map_src(walk); 332 walk->dst.virt.addr = walk->src.virt.addr; 333 334 if (diff) { 335 walk->flags |= SKCIPHER_WALK_DIFF; 336 skcipher_map_dst(walk); 337 } 338 339 return 0; 340} 341 342static int skcipher_walk_next(struct skcipher_walk *walk) 343{ 344 unsigned int bsize; 345 unsigned int n; 346 int err; 347 348 walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | 349 SKCIPHER_WALK_DIFF); 350 351 n = walk->total; 352 bsize = min(walk->stride, max(n, walk->blocksize)); 353 n = scatterwalk_clamp(&walk->in, n); 354 n = scatterwalk_clamp(&walk->out, n); 355 356 if (unlikely(n < bsize)) { 357 if (unlikely(walk->total < walk->blocksize)) 358 return skcipher_walk_done(walk, -EINVAL); 359 360slow_path: 361 err = skcipher_next_slow(walk, bsize); 362 goto set_phys_lowmem; 363 } 364 365 if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { 366 if (!walk->page) { 367 gfp_t gfp = skcipher_walk_gfp(walk); 368 369 walk->page = (void *)__get_free_page(gfp); 370 if (!walk->page) 371 goto slow_path; 372 } 373 374 walk->nbytes = min_t(unsigned, n, 375 PAGE_SIZE - offset_in_page(walk->page)); 376 walk->flags |= SKCIPHER_WALK_COPY; 377 err = skcipher_next_copy(walk); 378 goto set_phys_lowmem; 379 } 380 381 walk->nbytes = n; 382 383 return skcipher_next_fast(walk); 384 385set_phys_lowmem: 386 if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) { 387 walk->src.phys.page = virt_to_page(walk->src.virt.addr); 388 walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); 389 walk->src.phys.offset &= PAGE_SIZE - 1; 390 walk->dst.phys.offset &= PAGE_SIZE - 1; 391 } 392 return err; 393} 394 395static int skcipher_copy_iv(struct skcipher_walk *walk) 396{ 397 unsigned a = crypto_tfm_ctx_alignment() - 1; 398 unsigned alignmask = walk->alignmask; 399 unsigned ivsize = walk->ivsize; 400 unsigned bs = walk->stride; 401 unsigned aligned_bs; 402 unsigned size; 403 u8 *iv; 404 405 aligned_bs = ALIGN(bs, alignmask + 1); 406 407 /* Minimum size to align buffer by alignmask. */ 408 size = alignmask & ~a; 409 410 if (walk->flags & SKCIPHER_WALK_PHYS) 411 size += ivsize; 412 else { 413 size += aligned_bs + ivsize; 414 415 /* Minimum size to ensure buffer does not straddle a page. */ 416 size += (bs - 1) & ~(alignmask | a); 417 } 418 419 walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); 420 if (!walk->buffer) 421 return -ENOMEM; 422 423 iv = PTR_ALIGN(walk->buffer, alignmask + 1); 424 iv = skcipher_get_spot(iv, bs) + aligned_bs; 425 426 walk->iv = memcpy(iv, walk->iv, walk->ivsize); 427 return 0; 428} 429 430static int skcipher_walk_first(struct skcipher_walk *walk) 431{ 432 if (WARN_ON_ONCE(in_hardirq())) 433 return -EDEADLK; 434 435 walk->buffer = NULL; 436 if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { 437 int err = skcipher_copy_iv(walk); 438 if (err) 439 return err; 440 } 441 442 walk->page = NULL; 443 444 return skcipher_walk_next(walk); 445} 446 447static int skcipher_walk_skcipher(struct skcipher_walk *walk, 448 struct skcipher_request *req) 449{ 450 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 451 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 452 453 walk->total = req->cryptlen; 454 walk->nbytes = 0; 455 walk->iv = req->iv; 456 walk->oiv = req->iv; 457 458 if (unlikely(!walk->total)) 459 return 0; 460 461 scatterwalk_start(&walk->in, req->src); 462 scatterwalk_start(&walk->out, req->dst); 463 464 walk->flags &= ~SKCIPHER_WALK_SLEEP; 465 walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? 466 SKCIPHER_WALK_SLEEP : 0; 467 468 walk->blocksize = crypto_skcipher_blocksize(tfm); 469 walk->ivsize = crypto_skcipher_ivsize(tfm); 470 walk->alignmask = crypto_skcipher_alignmask(tfm); 471 472 if (alg->co.base.cra_type != &crypto_skcipher_type) 473 walk->stride = alg->co.chunksize; 474 else 475 walk->stride = alg->walksize; 476 477 return skcipher_walk_first(walk); 478} 479 480int skcipher_walk_virt(struct skcipher_walk *walk, 481 struct skcipher_request *req, bool atomic) 482{ 483 int err; 484 485 might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); 486 487 walk->flags &= ~SKCIPHER_WALK_PHYS; 488 489 err = skcipher_walk_skcipher(walk, req); 490 491 walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; 492 493 return err; 494} 495EXPORT_SYMBOL_GPL(skcipher_walk_virt); 496 497int skcipher_walk_async(struct skcipher_walk *walk, 498 struct skcipher_request *req) 499{ 500 walk->flags |= SKCIPHER_WALK_PHYS; 501 502 INIT_LIST_HEAD(&walk->buffers); 503 504 return skcipher_walk_skcipher(walk, req); 505} 506EXPORT_SYMBOL_GPL(skcipher_walk_async); 507 508static int skcipher_walk_aead_common(struct skcipher_walk *walk, 509 struct aead_request *req, bool atomic) 510{ 511 struct crypto_aead *tfm = crypto_aead_reqtfm(req); 512 int err; 513 514 walk->nbytes = 0; 515 walk->iv = req->iv; 516 walk->oiv = req->iv; 517 518 if (unlikely(!walk->total)) 519 return 0; 520 521 walk->flags &= ~SKCIPHER_WALK_PHYS; 522 523 scatterwalk_start(&walk->in, req->src); 524 scatterwalk_start(&walk->out, req->dst); 525 526 scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); 527 scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); 528 529 scatterwalk_done(&walk->in, 0, walk->total); 530 scatterwalk_done(&walk->out, 0, walk->total); 531 532 if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) 533 walk->flags |= SKCIPHER_WALK_SLEEP; 534 else 535 walk->flags &= ~SKCIPHER_WALK_SLEEP; 536 537 walk->blocksize = crypto_aead_blocksize(tfm); 538 walk->stride = crypto_aead_chunksize(tfm); 539 walk->ivsize = crypto_aead_ivsize(tfm); 540 walk->alignmask = crypto_aead_alignmask(tfm); 541 542 err = skcipher_walk_first(walk); 543 544 if (atomic) 545 walk->flags &= ~SKCIPHER_WALK_SLEEP; 546 547 return err; 548} 549 550int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, 551 struct aead_request *req, bool atomic) 552{ 553 walk->total = req->cryptlen; 554 555 return skcipher_walk_aead_common(walk, req, atomic); 556} 557EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); 558 559int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, 560 struct aead_request *req, bool atomic) 561{ 562 struct crypto_aead *tfm = crypto_aead_reqtfm(req); 563 564 walk->total = req->cryptlen - crypto_aead_authsize(tfm); 565 566 return skcipher_walk_aead_common(walk, req, atomic); 567} 568EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); 569 570static void skcipher_set_needkey(struct crypto_skcipher *tfm) 571{ 572 if (crypto_skcipher_max_keysize(tfm) != 0) 573 crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY); 574} 575 576static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, 577 const u8 *key, unsigned int keylen) 578{ 579 unsigned long alignmask = crypto_skcipher_alignmask(tfm); 580 struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); 581 u8 *buffer, *alignbuffer; 582 unsigned long absize; 583 int ret; 584 585 absize = keylen + alignmask; 586 buffer = kmalloc(absize, GFP_ATOMIC); 587 if (!buffer) 588 return -ENOMEM; 589 590 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); 591 memcpy(alignbuffer, key, keylen); 592 ret = cipher->setkey(tfm, alignbuffer, keylen); 593 kfree_sensitive(buffer); 594 return ret; 595} 596 597int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, 598 unsigned int keylen) 599{ 600 struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); 601 unsigned long alignmask = crypto_skcipher_alignmask(tfm); 602 int err; 603 604 if (cipher->co.base.cra_type != &crypto_skcipher_type) { 605 struct crypto_lskcipher **ctx = crypto_skcipher_ctx(tfm); 606 607 crypto_lskcipher_clear_flags(*ctx, CRYPTO_TFM_REQ_MASK); 608 crypto_lskcipher_set_flags(*ctx, 609 crypto_skcipher_get_flags(tfm) & 610 CRYPTO_TFM_REQ_MASK); 611 err = crypto_lskcipher_setkey(*ctx, key, keylen); 612 goto out; 613 } 614 615 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) 616 return -EINVAL; 617 618 if ((unsigned long)key & alignmask) 619 err = skcipher_setkey_unaligned(tfm, key, keylen); 620 else 621 err = cipher->setkey(tfm, key, keylen); 622 623out: 624 if (unlikely(err)) { 625 skcipher_set_needkey(tfm); 626 return err; 627 } 628 629 crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); 630 return 0; 631} 632EXPORT_SYMBOL_GPL(crypto_skcipher_setkey); 633 634int crypto_skcipher_encrypt(struct skcipher_request *req) 635{ 636 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 637 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 638 639 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) 640 return -ENOKEY; 641 if (alg->co.base.cra_type != &crypto_skcipher_type) 642 return crypto_lskcipher_encrypt_sg(req); 643 return alg->encrypt(req); 644} 645EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt); 646 647int crypto_skcipher_decrypt(struct skcipher_request *req) 648{ 649 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 650 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 651 652 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) 653 return -ENOKEY; 654 if (alg->co.base.cra_type != &crypto_skcipher_type) 655 return crypto_lskcipher_decrypt_sg(req); 656 return alg->decrypt(req); 657} 658EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt); 659 660static int crypto_lskcipher_export(struct skcipher_request *req, void *out) 661{ 662 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 663 u8 *ivs = skcipher_request_ctx(req); 664 665 ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1); 666 667 memcpy(out, ivs + crypto_skcipher_ivsize(tfm), 668 crypto_skcipher_statesize(tfm)); 669 670 return 0; 671} 672 673static int crypto_lskcipher_import(struct skcipher_request *req, const void *in) 674{ 675 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 676 u8 *ivs = skcipher_request_ctx(req); 677 678 ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1); 679 680 memcpy(ivs + crypto_skcipher_ivsize(tfm), in, 681 crypto_skcipher_statesize(tfm)); 682 683 return 0; 684} 685 686static int skcipher_noexport(struct skcipher_request *req, void *out) 687{ 688 return 0; 689} 690 691static int skcipher_noimport(struct skcipher_request *req, const void *in) 692{ 693 return 0; 694} 695 696int crypto_skcipher_export(struct skcipher_request *req, void *out) 697{ 698 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 699 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 700 701 if (alg->co.base.cra_type != &crypto_skcipher_type) 702 return crypto_lskcipher_export(req, out); 703 return alg->export(req, out); 704} 705EXPORT_SYMBOL_GPL(crypto_skcipher_export); 706 707int crypto_skcipher_import(struct skcipher_request *req, const void *in) 708{ 709 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 710 struct skcipher_alg *alg = crypto_skcipher_alg(tfm); 711 712 if (alg->co.base.cra_type != &crypto_skcipher_type) 713 return crypto_lskcipher_import(req, in); 714 return alg->import(req, in); 715} 716EXPORT_SYMBOL_GPL(crypto_skcipher_import); 717 718static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm) 719{ 720 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); 721 struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); 722 723 alg->exit(skcipher); 724} 725 726static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) 727{ 728 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); 729 struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); 730 731 skcipher_set_needkey(skcipher); 732 733 if (tfm->__crt_alg->cra_type != &crypto_skcipher_type) { 734 unsigned am = crypto_skcipher_alignmask(skcipher); 735 unsigned reqsize; 736 737 reqsize = am & ~(crypto_tfm_ctx_alignment() - 1); 738 reqsize += crypto_skcipher_ivsize(skcipher); 739 reqsize += crypto_skcipher_statesize(skcipher); 740 crypto_skcipher_set_reqsize(skcipher, reqsize); 741 742 return crypto_init_lskcipher_ops_sg(tfm); 743 } 744 745 if (alg->exit) 746 skcipher->base.exit = crypto_skcipher_exit_tfm; 747 748 if (alg->init) 749 return alg->init(skcipher); 750 751 return 0; 752} 753 754static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg) 755{ 756 if (alg->cra_type != &crypto_skcipher_type) 757 return sizeof(struct crypto_lskcipher *); 758 759 return crypto_alg_extsize(alg); 760} 761 762static void crypto_skcipher_free_instance(struct crypto_instance *inst) 763{ 764 struct skcipher_instance *skcipher = 765 container_of(inst, struct skcipher_instance, s.base); 766 767 skcipher->free(skcipher); 768} 769 770static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) 771 __maybe_unused; 772static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) 773{ 774 struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); 775 776 seq_printf(m, "type : skcipher\n"); 777 seq_printf(m, "async : %s\n", 778 alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); 779 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); 780 seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); 781 seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); 782 seq_printf(m, "ivsize : %u\n", skcipher->ivsize); 783 seq_printf(m, "chunksize : %u\n", skcipher->chunksize); 784 seq_printf(m, "walksize : %u\n", skcipher->walksize); 785 seq_printf(m, "statesize : %u\n", skcipher->statesize); 786} 787 788static int __maybe_unused crypto_skcipher_report( 789 struct sk_buff *skb, struct crypto_alg *alg) 790{ 791 struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); 792 struct crypto_report_blkcipher rblkcipher; 793 794 memset(&rblkcipher, 0, sizeof(rblkcipher)); 795 796 strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); 797 strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); 798 799 rblkcipher.blocksize = alg->cra_blocksize; 800 rblkcipher.min_keysize = skcipher->min_keysize; 801 rblkcipher.max_keysize = skcipher->max_keysize; 802 rblkcipher.ivsize = skcipher->ivsize; 803 804 return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, 805 sizeof(rblkcipher), &rblkcipher); 806} 807 808static const struct crypto_type crypto_skcipher_type = { 809 .extsize = crypto_skcipher_extsize, 810 .init_tfm = crypto_skcipher_init_tfm, 811 .free = crypto_skcipher_free_instance, 812#ifdef CONFIG_PROC_FS 813 .show = crypto_skcipher_show, 814#endif 815#if IS_ENABLED(CONFIG_CRYPTO_USER) 816 .report = crypto_skcipher_report, 817#endif 818 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 819 .maskset = CRYPTO_ALG_TYPE_SKCIPHER_MASK, 820 .type = CRYPTO_ALG_TYPE_SKCIPHER, 821 .tfmsize = offsetof(struct crypto_skcipher, base), 822}; 823 824int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, 825 struct crypto_instance *inst, 826 const char *name, u32 type, u32 mask) 827{ 828 spawn->base.frontend = &crypto_skcipher_type; 829 return crypto_grab_spawn(&spawn->base, inst, name, type, mask); 830} 831EXPORT_SYMBOL_GPL(crypto_grab_skcipher); 832 833struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, 834 u32 type, u32 mask) 835{ 836 return crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); 837} 838EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); 839 840struct crypto_sync_skcipher *crypto_alloc_sync_skcipher( 841 const char *alg_name, u32 type, u32 mask) 842{ 843 struct crypto_skcipher *tfm; 844 845 /* Only sync algorithms allowed. */ 846 mask |= CRYPTO_ALG_ASYNC | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE; 847 848 tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); 849 850 /* 851 * Make sure we do not allocate something that might get used with 852 * an on-stack request: check the request size. 853 */ 854 if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) > 855 MAX_SYNC_SKCIPHER_REQSIZE)) { 856 crypto_free_skcipher(tfm); 857 return ERR_PTR(-EINVAL); 858 } 859 860 return (struct crypto_sync_skcipher *)tfm; 861} 862EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher); 863 864int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask) 865{ 866 return crypto_type_has_alg(alg_name, &crypto_skcipher_type, type, mask); 867} 868EXPORT_SYMBOL_GPL(crypto_has_skcipher); 869 870int skcipher_prepare_alg_common(struct skcipher_alg_common *alg) 871{ 872 struct crypto_alg *base = &alg->base; 873 874 if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || 875 alg->statesize > PAGE_SIZE / 2 || 876 (alg->ivsize + alg->statesize) > PAGE_SIZE / 2) 877 return -EINVAL; 878 879 if (!alg->chunksize) 880 alg->chunksize = base->cra_blocksize; 881 882 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 883 884 return 0; 885} 886 887static int skcipher_prepare_alg(struct skcipher_alg *alg) 888{ 889 struct crypto_alg *base = &alg->base; 890 int err; 891 892 err = skcipher_prepare_alg_common(&alg->co); 893 if (err) 894 return err; 895 896 if (alg->walksize > PAGE_SIZE / 8) 897 return -EINVAL; 898 899 if (!alg->walksize) 900 alg->walksize = alg->chunksize; 901 902 if (!alg->statesize) { 903 alg->import = skcipher_noimport; 904 alg->export = skcipher_noexport; 905 } else if (!(alg->import && alg->export)) 906 return -EINVAL; 907 908 base->cra_type = &crypto_skcipher_type; 909 base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER; 910 911 return 0; 912} 913 914int crypto_register_skcipher(struct skcipher_alg *alg) 915{ 916 struct crypto_alg *base = &alg->base; 917 int err; 918 919 err = skcipher_prepare_alg(alg); 920 if (err) 921 return err; 922 923 return crypto_register_alg(base); 924} 925EXPORT_SYMBOL_GPL(crypto_register_skcipher); 926 927void crypto_unregister_skcipher(struct skcipher_alg *alg) 928{ 929 crypto_unregister_alg(&alg->base); 930} 931EXPORT_SYMBOL_GPL(crypto_unregister_skcipher); 932 933int crypto_register_skciphers(struct skcipher_alg *algs, int count) 934{ 935 int i, ret; 936 937 for (i = 0; i < count; i++) { 938 ret = crypto_register_skcipher(&algs[i]); 939 if (ret) 940 goto err; 941 } 942 943 return 0; 944 945err: 946 for (--i; i >= 0; --i) 947 crypto_unregister_skcipher(&algs[i]); 948 949 return ret; 950} 951EXPORT_SYMBOL_GPL(crypto_register_skciphers); 952 953void crypto_unregister_skciphers(struct skcipher_alg *algs, int count) 954{ 955 int i; 956 957 for (i = count - 1; i >= 0; --i) 958 crypto_unregister_skcipher(&algs[i]); 959} 960EXPORT_SYMBOL_GPL(crypto_unregister_skciphers); 961 962int skcipher_register_instance(struct crypto_template *tmpl, 963 struct skcipher_instance *inst) 964{ 965 int err; 966 967 if (WARN_ON(!inst->free)) 968 return -EINVAL; 969 970 err = skcipher_prepare_alg(&inst->alg); 971 if (err) 972 return err; 973 974 return crypto_register_instance(tmpl, skcipher_crypto_instance(inst)); 975} 976EXPORT_SYMBOL_GPL(skcipher_register_instance); 977 978static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key, 979 unsigned int keylen) 980{ 981 struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); 982 983 crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); 984 crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) & 985 CRYPTO_TFM_REQ_MASK); 986 return crypto_cipher_setkey(cipher, key, keylen); 987} 988 989static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm) 990{ 991 struct skcipher_instance *inst = skcipher_alg_instance(tfm); 992 struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst); 993 struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); 994 struct crypto_cipher *cipher; 995 996 cipher = crypto_spawn_cipher(spawn); 997 if (IS_ERR(cipher)) 998 return PTR_ERR(cipher); 999 1000 ctx->cipher = cipher; 1001 return 0; 1002} 1003 1004static void skcipher_exit_tfm_simple(struct crypto_skcipher *tfm) 1005{ 1006 struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); 1007 1008 crypto_free_cipher(ctx->cipher); 1009} 1010 1011static void skcipher_free_instance_simple(struct skcipher_instance *inst) 1012{ 1013 crypto_drop_cipher(skcipher_instance_ctx(inst)); 1014 kfree(inst); 1015} 1016 1017/** 1018 * skcipher_alloc_instance_simple - allocate instance of simple block cipher mode 1019 * 1020 * Allocate an skcipher_instance for a simple block cipher mode of operation, 1021 * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, 1022 * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, 1023 * alignmask, and priority are set from the underlying cipher but can be 1024 * overridden if needed. The tfm context defaults to skcipher_ctx_simple, and 1025 * default ->setkey(), ->init(), and ->exit() methods are installed. 1026 * 1027 * @tmpl: the template being instantiated 1028 * @tb: the template parameters 1029 * 1030 * Return: a pointer to the new instance, or an ERR_PTR(). The caller still 1031 * needs to register the instance. 1032 */ 1033struct skcipher_instance *skcipher_alloc_instance_simple( 1034 struct crypto_template *tmpl, struct rtattr **tb) 1035{ 1036 u32 mask; 1037 struct skcipher_instance *inst; 1038 struct crypto_cipher_spawn *spawn; 1039 struct crypto_alg *cipher_alg; 1040 int err; 1041 1042 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); 1043 if (err) 1044 return ERR_PTR(err); 1045 1046 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 1047 if (!inst) 1048 return ERR_PTR(-ENOMEM); 1049 spawn = skcipher_instance_ctx(inst); 1050 1051 err = crypto_grab_cipher(spawn, skcipher_crypto_instance(inst), 1052 crypto_attr_alg_name(tb[1]), 0, mask); 1053 if (err) 1054 goto err_free_inst; 1055 cipher_alg = crypto_spawn_cipher_alg(spawn); 1056 1057 err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name, 1058 cipher_alg); 1059 if (err) 1060 goto err_free_inst; 1061 1062 inst->free = skcipher_free_instance_simple; 1063 1064 /* Default algorithm properties, can be overridden */ 1065 inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize; 1066 inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask; 1067 inst->alg.base.cra_priority = cipher_alg->cra_priority; 1068 inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize; 1069 inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize; 1070 inst->alg.ivsize = cipher_alg->cra_blocksize; 1071 1072 /* Use skcipher_ctx_simple by default, can be overridden */ 1073 inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple); 1074 inst->alg.setkey = skcipher_setkey_simple; 1075 inst->alg.init = skcipher_init_tfm_simple; 1076 inst->alg.exit = skcipher_exit_tfm_simple; 1077 1078 return inst; 1079 1080err_free_inst: 1081 skcipher_free_instance_simple(inst); 1082 return ERR_PTR(err); 1083} 1084EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple); 1085 1086MODULE_LICENSE("GPL"); 1087MODULE_DESCRIPTION("Symmetric key cipher type"); 1088MODULE_IMPORT_NS(CRYPTO_INTERNAL); 1089