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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6-block.git] / crypto / skcipher.c
CommitLineData
7a7ffe65
HX		 1/*
2 * Symmetric key cipher operations.
3 *
4 * Generic encrypt/decrypt wrapper for ciphers, handles operations across
5 * multiple page boundaries by using temporary blocks. In user context,
6 * the kernel is given a chance to schedule us once per page.
7 *
8 * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
13 * any later version.
14 *
15 */
16
b286d8b1 17#include <crypto/internal/aead.h>
7a7ffe65 18#include <crypto/internal/skcipher.h>
b286d8b1 19#include <crypto/scatterwalk.h>
7a7ffe65 20#include <linux/bug.h>
4e6c3df4 21#include <linux/cryptouser.h>
d8c34b94 22#include <linux/compiler.h>
b286d8b1 23#include <linux/list.h>
7a7ffe65 24#include <linux/module.h>
4e6c3df4
HX		 25#include <linux/rtnetlink.h>
26#include <linux/seq_file.h>
27#include <net/netlink.h>
7a7ffe65
HX		 28
29#include "internal.h"
30
b286d8b1
HX		 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 int skcipher_walk_next(struct skcipher_walk *walk);
48
49static inline void skcipher_unmap(struct scatter_walk *walk, void *vaddr)
50{
51 if (PageHighMem(scatterwalk_page(walk)))
52 kunmap_atomic(vaddr);
53}
54
55static inline void *skcipher_map(struct scatter_walk *walk)
56{
57 struct page *page = scatterwalk_page(walk);
58
59 return (PageHighMem(page) ? kmap_atomic(page) : page_address(page)) +
60 offset_in_page(walk->offset);
61}
62
63static inline void skcipher_map_src(struct skcipher_walk *walk)
64{
65 walk->src.virt.addr = skcipher_map(&walk->in);
66}
67
68static inline void skcipher_map_dst(struct skcipher_walk *walk)
69{
70 walk->dst.virt.addr = skcipher_map(&walk->out);
71}
72
73static inline void skcipher_unmap_src(struct skcipher_walk *walk)
74{
75 skcipher_unmap(&walk->in, walk->src.virt.addr);
76}
77
78static inline void skcipher_unmap_dst(struct skcipher_walk *walk)
79{
80 skcipher_unmap(&walk->out, walk->dst.virt.addr);
81}
82
83static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk)
84{
85 return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC;
86}
87
88/* Get a spot of the specified length that does not straddle a page.
89 * The caller needs to ensure that there is enough space for this operation.
90 */
91static inline u8 *skcipher_get_spot(u8 *start, unsigned int len)
92{
93 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
94
95 return max(start, end_page);
96}
97
8088d3dd 98static void skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize)
b286d8b1
HX		 99{
100 u8 *addr;
101
102 addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
103 addr = skcipher_get_spot(addr, bsize);
104 scatterwalk_copychunks(addr, &walk->out, bsize,
105 (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1);
b286d8b1
HX		 106}
107
108int skcipher_walk_done(struct skcipher_walk *walk, int err)
109{
8088d3dd
EB		 110 unsigned int n; /* bytes processed */
111 bool more;
112
113 if (unlikely(err < 0))
114 goto finish;
115
116 n = walk->nbytes - err;
117 walk->total -= n;
118 more = (walk->total != 0);
119
120 if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS |
121 SKCIPHER_WALK_SLOW |
122 SKCIPHER_WALK_COPY |
123 SKCIPHER_WALK_DIFF)))) {
b286d8b1
HX		 124unmap_src:
125 skcipher_unmap_src(walk);
126 } else if (walk->flags & SKCIPHER_WALK_DIFF) {
127 skcipher_unmap_dst(walk);
128 goto unmap_src;
129 } else if (walk->flags & SKCIPHER_WALK_COPY) {
130 skcipher_map_dst(walk);
131 memcpy(walk->dst.virt.addr, walk->page, n);
132 skcipher_unmap_dst(walk);
133 } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) {
134 if (WARN_ON(err)) {
8088d3dd 135 /* unexpected case; didn't process all bytes */
b286d8b1 136 err = -EINVAL;
8088d3dd
EB		 137 goto finish;
138 }
139 skcipher_done_slow(walk, n);
140 goto already_advanced;
b286d8b1
HX		 141 }
142
b286d8b1
HX		 143 scatterwalk_advance(&walk->in, n);
144 scatterwalk_advance(&walk->out, n);
8088d3dd
EB		 145already_advanced:
146 scatterwalk_done(&walk->in, 0, more);
147 scatterwalk_done(&walk->out, 1, more);
b286d8b1 148
8088d3dd 149 if (more) {
b286d8b1
HX		 150 crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ?
151 CRYPTO_TFM_REQ_MAY_SLEEP : 0);
152 return skcipher_walk_next(walk);
153 }
8088d3dd
EB		 154 err = 0;
155finish:
156 walk->nbytes = 0;
b286d8b1
HX		 157
158 /* Short-circuit for the common/fast path. */
159 if (!((unsigned long)walk->buffer | (unsigned long)walk->page))
160 goto out;
161
162 if (walk->flags & SKCIPHER_WALK_PHYS)
163 goto out;
164
165 if (walk->iv != walk->oiv)
166 memcpy(walk->oiv, walk->iv, walk->ivsize);
167 if (walk->buffer != walk->page)
168 kfree(walk->buffer);
169 if (walk->page)
170 free_page((unsigned long)walk->page);
171
172out:
173 return err;
174}
175EXPORT_SYMBOL_GPL(skcipher_walk_done);
176
177void skcipher_walk_complete(struct skcipher_walk *walk, int err)
178{
179 struct skcipher_walk_buffer *p, *tmp;
180
181 list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
182 u8 *data;
183
184 if (err)
185 goto done;
186
187 data = p->data;
188 if (!data) {
189 data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1);
c821f6ab 190 data = skcipher_get_spot(data, walk->stride);
b286d8b1
HX		 191 }
192
193 scatterwalk_copychunks(data, &p->dst, p->len, 1);
194
c821f6ab 195 if (offset_in_page(p->data) + p->len + walk->stride >
b286d8b1
HX		 196 PAGE_SIZE)
197 free_page((unsigned long)p->data);
198
199done:
200 list_del(&p->entry);
201 kfree(p);
202 }
203
204 if (!err && walk->iv != walk->oiv)
205 memcpy(walk->oiv, walk->iv, walk->ivsize);
206 if (walk->buffer != walk->page)
207 kfree(walk->buffer);
208 if (walk->page)
209 free_page((unsigned long)walk->page);
210}
211EXPORT_SYMBOL_GPL(skcipher_walk_complete);
212
213static void skcipher_queue_write(struct skcipher_walk *walk,
214 struct skcipher_walk_buffer *p)
215{
216 p->dst = walk->out;
217 list_add_tail(&p->entry, &walk->buffers);
218}
219
220static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize)
221{
222 bool phys = walk->flags & SKCIPHER_WALK_PHYS;
223 unsigned alignmask = walk->alignmask;
224 struct skcipher_walk_buffer *p;
225 unsigned a;
226 unsigned n;
227 u8 *buffer;
228 void *v;
229
230 if (!phys) {
18e615ad
AB		 231 if (!walk->buffer)
232 walk->buffer = walk->page;
233 buffer = walk->buffer;
b286d8b1
HX		 234 if (buffer)
235 goto ok;
236 }
237
238 /* Start with the minimum alignment of kmalloc. */
239 a = crypto_tfm_ctx_alignment() - 1;
240 n = bsize;
241
242 if (phys) {
243 /* Calculate the minimum alignment of p->buffer. */
244 a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1;
245 n += sizeof(*p);
246 }
247
248 /* Minimum size to align p->buffer by alignmask. */
249 n += alignmask & ~a;
250
251 /* Minimum size to ensure p->buffer does not straddle a page. */
252 n += (bsize - 1) & ~(alignmask | a);
253
254 v = kzalloc(n, skcipher_walk_gfp(walk));
255 if (!v)
256 return skcipher_walk_done(walk, -ENOMEM);
257
258 if (phys) {
259 p = v;
260 p->len = bsize;
261 skcipher_queue_write(walk, p);
262 buffer = p->buffer;
263 } else {
264 walk->buffer = v;
265 buffer = v;
266 }
267
268ok:
269 walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1);
270 walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize);
271 walk->src.virt.addr = walk->dst.virt.addr;
272
273 scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
274
275 walk->nbytes = bsize;
276 walk->flags |= SKCIPHER_WALK_SLOW;
277
278 return 0;
279}
280
281static int skcipher_next_copy(struct skcipher_walk *walk)
282{
283 struct skcipher_walk_buffer *p;
284 u8 *tmp = walk->page;
285
286 skcipher_map_src(walk);
287 memcpy(tmp, walk->src.virt.addr, walk->nbytes);
288 skcipher_unmap_src(walk);
289
290 walk->src.virt.addr = tmp;
291 walk->dst.virt.addr = tmp;
292
293 if (!(walk->flags & SKCIPHER_WALK_PHYS))
294 return 0;
295
296 p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk));
297 if (!p)
298 return -ENOMEM;
299
300 p->data = walk->page;
301 p->len = walk->nbytes;
302 skcipher_queue_write(walk, p);
303
c821f6ab 304 if (offset_in_page(walk->page) + walk->nbytes + walk->stride >
b286d8b1
HX		 305 PAGE_SIZE)
306 walk->page = NULL;
307 else
308 walk->page += walk->nbytes;
309
310 return 0;
311}
312
313static int skcipher_next_fast(struct skcipher_walk *walk)
314{
315 unsigned long diff;
316
317 walk->src.phys.page = scatterwalk_page(&walk->in);
318 walk->src.phys.offset = offset_in_page(walk->in.offset);
319 walk->dst.phys.page = scatterwalk_page(&walk->out);
320 walk->dst.phys.offset = offset_in_page(walk->out.offset);
321
322 if (walk->flags & SKCIPHER_WALK_PHYS)
323 return 0;
324
325 diff = walk->src.phys.offset - walk->dst.phys.offset;
326 diff |= walk->src.virt.page - walk->dst.virt.page;
327
328 skcipher_map_src(walk);
329 walk->dst.virt.addr = walk->src.virt.addr;
330
331 if (diff) {
332 walk->flags |= SKCIPHER_WALK_DIFF;
333 skcipher_map_dst(walk);
334 }
335
336 return 0;
337}
338
339static int skcipher_walk_next(struct skcipher_walk *walk)
340{
341 unsigned int bsize;
342 unsigned int n;
343 int err;
344
345 walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY |
346 SKCIPHER_WALK_DIFF);
347
348 n = walk->total;
c821f6ab 349 bsize = min(walk->stride, max(n, walk->blocksize));
b286d8b1
HX		 350 n = scatterwalk_clamp(&walk->in, n);
351 n = scatterwalk_clamp(&walk->out, n);
352
353 if (unlikely(n < bsize)) {
354 if (unlikely(walk->total < walk->blocksize))
355 return skcipher_walk_done(walk, -EINVAL);
356
357slow_path:
358 err = skcipher_next_slow(walk, bsize);
359 goto set_phys_lowmem;
360 }
361
362 if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) {
363 if (!walk->page) {
364 gfp_t gfp = skcipher_walk_gfp(walk);
365
366 walk->page = (void *)__get_free_page(gfp);
367 if (!walk->page)
368 goto slow_path;
369 }
370
371 walk->nbytes = min_t(unsigned, n,
372 PAGE_SIZE - offset_in_page(walk->page));
373 walk->flags |= SKCIPHER_WALK_COPY;
374 err = skcipher_next_copy(walk);
375 goto set_phys_lowmem;
376 }
377
378 walk->nbytes = n;
379
380 return skcipher_next_fast(walk);
381
382set_phys_lowmem:
383 if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) {
384 walk->src.phys.page = virt_to_page(walk->src.virt.addr);
385 walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
386 walk->src.phys.offset &= PAGE_SIZE - 1;
387 walk->dst.phys.offset &= PAGE_SIZE - 1;
388 }
389 return err;
390}
b286d8b1
HX		 391
392static int skcipher_copy_iv(struct skcipher_walk *walk)
393{
394 unsigned a = crypto_tfm_ctx_alignment() - 1;
395 unsigned alignmask = walk->alignmask;
396 unsigned ivsize = walk->ivsize;
c821f6ab 397 unsigned bs = walk->stride;
b286d8b1
HX		 398 unsigned aligned_bs;
399 unsigned size;
400 u8 *iv;
401
0567fc9e 402 aligned_bs = ALIGN(bs, alignmask + 1);
b286d8b1
HX		 403
404 /* Minimum size to align buffer by alignmask. */
405 size = alignmask & ~a;
406
407 if (walk->flags & SKCIPHER_WALK_PHYS)
408 size += ivsize;
409 else {
410 size += aligned_bs + ivsize;
411
412 /* Minimum size to ensure buffer does not straddle a page. */
413 size += (bs - 1) & ~(alignmask | a);
414 }
415
416 walk->buffer = kmalloc(size, skcipher_walk_gfp(walk));
417 if (!walk->buffer)
418 return -ENOMEM;
419
420 iv = PTR_ALIGN(walk->buffer, alignmask + 1);
421 iv = skcipher_get_spot(iv, bs) + aligned_bs;
422
423 walk->iv = memcpy(iv, walk->iv, walk->ivsize);
424 return 0;
425}
426
427static int skcipher_walk_first(struct skcipher_walk *walk)
428{
b286d8b1
HX		 429 if (WARN_ON_ONCE(in_irq()))
430 return -EDEADLK;
431
b286d8b1
HX		 432 walk->buffer = NULL;
433 if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
434 int err = skcipher_copy_iv(walk);
435 if (err)
436 return err;
437 }
438
439 walk->page = NULL;
b286d8b1
HX		 440
441 return skcipher_walk_next(walk);
442}
443
444static int skcipher_walk_skcipher(struct skcipher_walk *walk,
445 struct skcipher_request *req)
446{
447 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
448
0cabf2af
HX		 449 walk->total = req->cryptlen;
450 walk->nbytes = 0;
2b4f27c3
EB		 451 walk->iv = req->iv;
452 walk->oiv = req->iv;
0cabf2af
HX		 453
454 if (unlikely(!walk->total))
455 return 0;
456
b286d8b1
HX		 457 scatterwalk_start(&walk->in, req->src);
458 scatterwalk_start(&walk->out, req->dst);
459
b286d8b1
HX		 460 walk->flags &= ~SKCIPHER_WALK_SLEEP;
461 walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
462 SKCIPHER_WALK_SLEEP : 0;
463
464 walk->blocksize = crypto_skcipher_blocksize(tfm);
c821f6ab 465 walk->stride = crypto_skcipher_walksize(tfm);
b286d8b1
HX		 466 walk->ivsize = crypto_skcipher_ivsize(tfm);
467 walk->alignmask = crypto_skcipher_alignmask(tfm);
468
469 return skcipher_walk_first(walk);
470}
471
472int skcipher_walk_virt(struct skcipher_walk *walk,
473 struct skcipher_request *req, bool atomic)
474{
475 int err;
476
bb648291
EB		 477 might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
478
b286d8b1
HX		 479 walk->flags &= ~SKCIPHER_WALK_PHYS;
480
481 err = skcipher_walk_skcipher(walk, req);
482
483 walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0;
484
485 return err;
486}
487EXPORT_SYMBOL_GPL(skcipher_walk_virt);
488
489void skcipher_walk_atomise(struct skcipher_walk *walk)
490{
491 walk->flags &= ~SKCIPHER_WALK_SLEEP;
492}
493EXPORT_SYMBOL_GPL(skcipher_walk_atomise);
494
495int skcipher_walk_async(struct skcipher_walk *walk,
496 struct skcipher_request *req)
497{
498 walk->flags |= SKCIPHER_WALK_PHYS;
499
500 INIT_LIST_HEAD(&walk->buffers);
501
502 return skcipher_walk_skcipher(walk, req);
503}
504EXPORT_SYMBOL_GPL(skcipher_walk_async);
505
34bc085c
HX		 506static int skcipher_walk_aead_common(struct skcipher_walk *walk,
507 struct aead_request *req, bool atomic)
b286d8b1
HX		 508{
509 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
510 int err;
511
0cabf2af 512 walk->nbytes = 0;
2b4f27c3
EB		 513 walk->iv = req->iv;
514 walk->oiv = req->iv;
0cabf2af
HX		 515
516 if (unlikely(!walk->total))
517 return 0;
518
3cbf61fb
AB		 519 walk->flags &= ~SKCIPHER_WALK_PHYS;
520
b286d8b1
HX		 521 scatterwalk_start(&walk->in, req->src);
522 scatterwalk_start(&walk->out, req->dst);
523
524 scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
525 scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
526
c14ca838
OM		 527 scatterwalk_done(&walk->in, 0, walk->total);
528 scatterwalk_done(&walk->out, 0, walk->total);
529
b286d8b1
HX		 530 if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP)
531 walk->flags |= SKCIPHER_WALK_SLEEP;
532 else
533 walk->flags &= ~SKCIPHER_WALK_SLEEP;
534
535 walk->blocksize = crypto_aead_blocksize(tfm);
c821f6ab 536 walk->stride = crypto_aead_chunksize(tfm);
b286d8b1
HX		 537 walk->ivsize = crypto_aead_ivsize(tfm);
538 walk->alignmask = crypto_aead_alignmask(tfm);
539
540 err = skcipher_walk_first(walk);
541
542 if (atomic)
543 walk->flags &= ~SKCIPHER_WALK_SLEEP;
544
545 return err;
546}
34bc085c
HX		 547
548int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
549 bool atomic)
550{
551 walk->total = req->cryptlen;
552
553 return skcipher_walk_aead_common(walk, req, atomic);
554}
b286d8b1
HX		 555EXPORT_SYMBOL_GPL(skcipher_walk_aead);
556
34bc085c
HX		 557int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
558 struct aead_request *req, bool atomic)
559{
560 walk->total = req->cryptlen;
561
562 return skcipher_walk_aead_common(walk, req, atomic);
563}
564EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt);
565
566int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
567 struct aead_request *req, bool atomic)
568{
569 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
570
571 walk->total = req->cryptlen - crypto_aead_authsize(tfm);
572
573 return skcipher_walk_aead_common(walk, req, atomic);
574}
575EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt);
576
7a7ffe65
HX		 577static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg)
578{
579 if (alg->cra_type == &crypto_blkcipher_type)
580 return sizeof(struct crypto_blkcipher *);
581
c79b411e 582 if (alg->cra_type == &crypto_ablkcipher_type)
4e6c3df4 583 return sizeof(struct crypto_ablkcipher *);
7a7ffe65 584
4e6c3df4 585 return crypto_alg_extsize(alg);
7a7ffe65
HX		 586}
587
588static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm,
589 const u8 *key, unsigned int keylen)
590{
591 struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm);
592 struct crypto_blkcipher *blkcipher = *ctx;
593 int err;
594
595 crypto_blkcipher_clear_flags(blkcipher, ~0);
596 crypto_blkcipher_set_flags(blkcipher, crypto_skcipher_get_flags(tfm) &
597 CRYPTO_TFM_REQ_MASK);
598 err = crypto_blkcipher_setkey(blkcipher, key, keylen);
599 crypto_skcipher_set_flags(tfm, crypto_blkcipher_get_flags(blkcipher) &
600 CRYPTO_TFM_RES_MASK);
f8d33fac
EB		 601 if (err)
602 return err;
7a7ffe65 603
f8d33fac
EB		 604 crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
605 return 0;
7a7ffe65
HX		 606}
607
608static int skcipher_crypt_blkcipher(struct skcipher_request *req,
609 int (*crypt)(struct blkcipher_desc *,
610 struct scatterlist *,
611 struct scatterlist *,
612 unsigned int))
613{
614 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
615 struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm);
616 struct blkcipher_desc desc = {
617 .tfm = *ctx,
618 .info = req->iv,
619 .flags = req->base.flags,
620 };
621
622
623 return crypt(&desc, req->dst, req->src, req->cryptlen);
624}
625
626static int skcipher_encrypt_blkcipher(struct skcipher_request *req)
627{
628 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
629 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
630 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
631
632 return skcipher_crypt_blkcipher(req, alg->encrypt);
633}
634
635static int skcipher_decrypt_blkcipher(struct skcipher_request *req)
636{
637 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
638 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
639 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
640
641 return skcipher_crypt_blkcipher(req, alg->decrypt);
642}
643
644static void crypto_exit_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
645{
646 struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm);
647
648 crypto_free_blkcipher(*ctx);
649}
650
ecdd6bed 651static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
7a7ffe65
HX		 652{
653 struct crypto_alg *calg = tfm->__crt_alg;
654 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
655 struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm);
656 struct crypto_blkcipher *blkcipher;
657 struct crypto_tfm *btfm;
658
659 if (!crypto_mod_get(calg))
660 return -EAGAIN;
661
662 btfm = __crypto_alloc_tfm(calg, CRYPTO_ALG_TYPE_BLKCIPHER,
663 CRYPTO_ALG_TYPE_MASK);
664 if (IS_ERR(btfm)) {
665 crypto_mod_put(calg);
666 return PTR_ERR(btfm);
667 }
668
669 blkcipher = __crypto_blkcipher_cast(btfm);
670 *ctx = blkcipher;
671 tfm->exit = crypto_exit_skcipher_ops_blkcipher;
672
673 skcipher->setkey = skcipher_setkey_blkcipher;
674 skcipher->encrypt = skcipher_encrypt_blkcipher;
675 skcipher->decrypt = skcipher_decrypt_blkcipher;
676
677 skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher);
973fb3fb 678 skcipher->keysize = calg->cra_blkcipher.max_keysize;
7a7ffe65 679
f8d33fac
EB		 680 if (skcipher->keysize)
681 crypto_skcipher_set_flags(skcipher, CRYPTO_TFM_NEED_KEY);
682
7a7ffe65
HX		 683 return 0;
684}
685
686static int skcipher_setkey_ablkcipher(struct crypto_skcipher *tfm,
687 const u8 *key, unsigned int keylen)
688{
689 struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm);
690 struct crypto_ablkcipher *ablkcipher = *ctx;
691 int err;
692
693 crypto_ablkcipher_clear_flags(ablkcipher, ~0);
694 crypto_ablkcipher_set_flags(ablkcipher,
695 crypto_skcipher_get_flags(tfm) &
696 CRYPTO_TFM_REQ_MASK);
697 err = crypto_ablkcipher_setkey(ablkcipher, key, keylen);
698 crypto_skcipher_set_flags(tfm,
699 crypto_ablkcipher_get_flags(ablkcipher) &
700 CRYPTO_TFM_RES_MASK);
f8d33fac
EB		 701 if (err)
702 return err;
7a7ffe65 703
f8d33fac
EB		 704 crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
705 return 0;
7a7ffe65
HX		 706}
707
708static int skcipher_crypt_ablkcipher(struct skcipher_request *req,
709 int (*crypt)(struct ablkcipher_request *))
710{
711 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
712 struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm);
713 struct ablkcipher_request *subreq = skcipher_request_ctx(req);
714
715 ablkcipher_request_set_tfm(subreq, *ctx);
716 ablkcipher_request_set_callback(subreq, skcipher_request_flags(req),
717 req->base.complete, req->base.data);
718 ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
719 req->iv);
720
721 return crypt(subreq);
722}
723
724static int skcipher_encrypt_ablkcipher(struct skcipher_request *req)
725{
726 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
727 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
728 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
729
730 return skcipher_crypt_ablkcipher(req, alg->encrypt);
731}
732
733static int skcipher_decrypt_ablkcipher(struct skcipher_request *req)
734{
735 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
736 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
737 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
738
739 return skcipher_crypt_ablkcipher(req, alg->decrypt);
740}
741
742static void crypto_exit_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
743{
744 struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm);
745
746 crypto_free_ablkcipher(*ctx);
747}
748
ecdd6bed 749static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
7a7ffe65
HX		 750{
751 struct crypto_alg *calg = tfm->__crt_alg;
752 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
753 struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm);
754 struct crypto_ablkcipher *ablkcipher;
755 struct crypto_tfm *abtfm;
756
757 if (!crypto_mod_get(calg))
758 return -EAGAIN;
759
760 abtfm = __crypto_alloc_tfm(calg, 0, 0);
761 if (IS_ERR(abtfm)) {
762 crypto_mod_put(calg);
763 return PTR_ERR(abtfm);
764 }
765
766 ablkcipher = __crypto_ablkcipher_cast(abtfm);
767 *ctx = ablkcipher;
768 tfm->exit = crypto_exit_skcipher_ops_ablkcipher;
769
770 skcipher->setkey = skcipher_setkey_ablkcipher;
771 skcipher->encrypt = skcipher_encrypt_ablkcipher;
772 skcipher->decrypt = skcipher_decrypt_ablkcipher;
773
774 skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
775 skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) +
776 sizeof(struct ablkcipher_request);
973fb3fb 777 skcipher->keysize = calg->cra_ablkcipher.max_keysize;
7a7ffe65 778
f8d33fac
EB		 779 if (skcipher->keysize)
780 crypto_skcipher_set_flags(skcipher, CRYPTO_TFM_NEED_KEY);
781
7a7ffe65
HX		 782 return 0;
783}
784
9933e113
HX		 785static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm,
786 const u8 *key, unsigned int keylen)
787{
788 unsigned long alignmask = crypto_skcipher_alignmask(tfm);
789 struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
790 u8 *buffer, *alignbuffer;
791 unsigned long absize;
792 int ret;
793
794 absize = keylen + alignmask;
795 buffer = kmalloc(absize, GFP_ATOMIC);
796 if (!buffer)
797 return -ENOMEM;
798
799 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
800 memcpy(alignbuffer, key, keylen);
801 ret = cipher->setkey(tfm, alignbuffer, keylen);
802 kzfree(buffer);
803 return ret;
804}
805
806static int skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
807 unsigned int keylen)
808{
809 struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
810 unsigned long alignmask = crypto_skcipher_alignmask(tfm);
f8d33fac 811 int err;
9933e113
HX		 812
813 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
814 crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
815 return -EINVAL;
816 }
817
818 if ((unsigned long)key & alignmask)
f8d33fac
EB		 819 err = skcipher_setkey_unaligned(tfm, key, keylen);
820 else
821 err = cipher->setkey(tfm, key, keylen);
822
823 if (err)
824 return err;
9933e113 825
f8d33fac
EB		 826 crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
827 return 0;
9933e113
HX		 828}
829
4e6c3df4
HX		 830static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm)
831{
832 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
833 struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
834
835 alg->exit(skcipher);
836}
837
7a7ffe65
HX		 838static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
839{
4e6c3df4
HX		 840 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
841 struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
842
7a7ffe65
HX		 843 if (tfm->__crt_alg->cra_type == &crypto_blkcipher_type)
844 return crypto_init_skcipher_ops_blkcipher(tfm);
845
c79b411e 846 if (tfm->__crt_alg->cra_type == &crypto_ablkcipher_type)
4e6c3df4
HX		 847 return crypto_init_skcipher_ops_ablkcipher(tfm);
848
9933e113 849 skcipher->setkey = skcipher_setkey;
4e6c3df4
HX		 850 skcipher->encrypt = alg->encrypt;
851 skcipher->decrypt = alg->decrypt;
852 skcipher->ivsize = alg->ivsize;
853 skcipher->keysize = alg->max_keysize;
854
f8d33fac
EB		 855 if (skcipher->keysize)
856 crypto_skcipher_set_flags(skcipher, CRYPTO_TFM_NEED_KEY);
857
4e6c3df4
HX		 858 if (alg->exit)
859 skcipher->base.exit = crypto_skcipher_exit_tfm;
7a7ffe65 860
4e6c3df4
HX		 861 if (alg->init)
862 return alg->init(skcipher);
863
864 return 0;
865}
866
867static void crypto_skcipher_free_instance(struct crypto_instance *inst)
868{
869 struct skcipher_instance *skcipher =
870 container_of(inst, struct skcipher_instance, s.base);
871
872 skcipher->free(skcipher);
873}
874
875static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
d8c34b94 876 __maybe_unused;
4e6c3df4
HX		 877static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
878{
879 struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
880 base);
881
882 seq_printf(m, "type : skcipher\n");
883 seq_printf(m, "async : %s\n",
884 alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no");
885 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
886 seq_printf(m, "min keysize : %u\n", skcipher->min_keysize);
887 seq_printf(m, "max keysize : %u\n", skcipher->max_keysize);
888 seq_printf(m, "ivsize : %u\n", skcipher->ivsize);
889 seq_printf(m, "chunksize : %u\n", skcipher->chunksize);
c821f6ab 890 seq_printf(m, "walksize : %u\n", skcipher->walksize);
7a7ffe65
HX		 891}
892
4e6c3df4
HX		 893#ifdef CONFIG_NET
894static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
895{
896 struct crypto_report_blkcipher rblkcipher;
897 struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
898 base);
899
37db69e0
EB		 900 memset(&rblkcipher, 0, sizeof(rblkcipher));
901
902 strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type));
903 strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));
4e6c3df4
HX		 904
905 rblkcipher.blocksize = alg->cra_blocksize;
906 rblkcipher.min_keysize = skcipher->min_keysize;
907 rblkcipher.max_keysize = skcipher->max_keysize;
908 rblkcipher.ivsize = skcipher->ivsize;
909
37db69e0
EB		 910 return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
911 sizeof(rblkcipher), &rblkcipher);
4e6c3df4
HX		 912}
913#else
914static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
915{
916 return -ENOSYS;
917}
918#endif
919
7a7ffe65
HX		 920static const struct crypto_type crypto_skcipher_type2 = {
921 .extsize = crypto_skcipher_extsize,
922 .init_tfm = crypto_skcipher_init_tfm,
4e6c3df4
HX		 923 .free = crypto_skcipher_free_instance,
924#ifdef CONFIG_PROC_FS
925 .show = crypto_skcipher_show,
926#endif
927 .report = crypto_skcipher_report,
7a7ffe65
HX		 928 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
929 .maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK,
4e6c3df4 930 .type = CRYPTO_ALG_TYPE_SKCIPHER,
7a7ffe65
HX		 931 .tfmsize = offsetof(struct crypto_skcipher, base),
932};
933
3a01d0ee 934int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
4e6c3df4
HX		 935 const char *name, u32 type, u32 mask)
936{
937 spawn->base.frontend = &crypto_skcipher_type2;
938 return crypto_grab_spawn(&spawn->base, name, type, mask);
939}
3a01d0ee 940EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
4e6c3df4 941
7a7ffe65
HX		 942struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
943 u32 type, u32 mask)
944{
945 return crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask);
946}
947EXPORT_SYMBOL_GPL(crypto_alloc_skcipher);
948
b350bee5
KC		 949struct crypto_sync_skcipher *crypto_alloc_sync_skcipher(
950 const char *alg_name, u32 type, u32 mask)
951{
952 struct crypto_skcipher *tfm;
953
954 /* Only sync algorithms allowed. */
955 mask |= CRYPTO_ALG_ASYNC;
956
957 tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask);
958
959 /*
960 * Make sure we do not allocate something that might get used with
961 * an on-stack request: check the request size.
962 */
963 if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) >
964 MAX_SYNC_SKCIPHER_REQSIZE)) {
965 crypto_free_skcipher(tfm);
966 return ERR_PTR(-EINVAL);
967 }
968
969 return (struct crypto_sync_skcipher *)tfm;
970}
971EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher);
972
4e6c3df4
HX		 973int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask)
974{
975 return crypto_type_has_alg(alg_name, &crypto_skcipher_type2,
976 type, mask);
977}
978EXPORT_SYMBOL_GPL(crypto_has_skcipher2);
979
980static int skcipher_prepare_alg(struct skcipher_alg *alg)
981{
982 struct crypto_alg *base = &alg->base;
983
c821f6ab
AB		 984 if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
985 alg->walksize > PAGE_SIZE / 8)
4e6c3df4
HX		 986 return -EINVAL;
987
988 if (!alg->chunksize)
989 alg->chunksize = base->cra_blocksize;
c821f6ab
AB		 990 if (!alg->walksize)
991 alg->walksize = alg->chunksize;
4e6c3df4
HX		 992
993 base->cra_type = &crypto_skcipher_type2;
994 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
995 base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
996
997 return 0;
998}
999
1000int crypto_register_skcipher(struct skcipher_alg *alg)
1001{
1002 struct crypto_alg *base = &alg->base;
1003 int err;
1004
1005 err = skcipher_prepare_alg(alg);
1006 if (err)
1007 return err;
1008
1009 return crypto_register_alg(base);
1010}
1011EXPORT_SYMBOL_GPL(crypto_register_skcipher);
1012
1013void crypto_unregister_skcipher(struct skcipher_alg *alg)
1014{
1015 crypto_unregister_alg(&alg->base);
1016}
1017EXPORT_SYMBOL_GPL(crypto_unregister_skcipher);
1018
1019int crypto_register_skciphers(struct skcipher_alg *algs, int count)
1020{
1021 int i, ret;
1022
1023 for (i = 0; i < count; i++) {
1024 ret = crypto_register_skcipher(&algs[i]);
1025 if (ret)
1026 goto err;
1027 }
1028
1029 return 0;
1030
1031err:
1032 for (--i; i >= 0; --i)
1033 crypto_unregister_skcipher(&algs[i]);
1034
1035 return ret;
1036}
1037EXPORT_SYMBOL_GPL(crypto_register_skciphers);
1038
1039void crypto_unregister_skciphers(struct skcipher_alg *algs, int count)
1040{
1041 int i;
1042
1043 for (i = count - 1; i >= 0; --i)
1044 crypto_unregister_skcipher(&algs[i]);
1045}
1046EXPORT_SYMBOL_GPL(crypto_unregister_skciphers);
1047
1048int skcipher_register_instance(struct crypto_template *tmpl,
1049 struct skcipher_instance *inst)
1050{
1051 int err;
1052
1053 err = skcipher_prepare_alg(&inst->alg);
1054 if (err)
1055 return err;
1056
1057 return crypto_register_instance(tmpl, skcipher_crypto_instance(inst));
1058}
1059EXPORT_SYMBOL_GPL(skcipher_register_instance);
1060
7a7ffe65
HX		 1061MODULE_LICENSE("GPL");
1062MODULE_DESCRIPTION("Symmetric key cipher type");
Linux 6.x block layer and io_uring tree(s)