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crypto: skcipher - Fix skcipher_walk_aead_common
[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
98static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize)
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);
106 return 0;
107}
108
109int skcipher_walk_done(struct skcipher_walk *walk, int err)
110{
111 unsigned int n = walk->nbytes - err;
112 unsigned int nbytes;
113
114 nbytes = walk->total - n;
115
116 if (unlikely(err < 0)) {
117 nbytes = 0;
118 n = 0;
119 } else if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS |
120 SKCIPHER_WALK_SLOW |
121 SKCIPHER_WALK_COPY |
122 SKCIPHER_WALK_DIFF)))) {
123unmap_src:
124 skcipher_unmap_src(walk);
125 } else if (walk->flags & SKCIPHER_WALK_DIFF) {
126 skcipher_unmap_dst(walk);
127 goto unmap_src;
128 } else if (walk->flags & SKCIPHER_WALK_COPY) {
129 skcipher_map_dst(walk);
130 memcpy(walk->dst.virt.addr, walk->page, n);
131 skcipher_unmap_dst(walk);
132 } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) {
133 if (WARN_ON(err)) {
134 err = -EINVAL;
135 nbytes = 0;
136 } else
137 n = skcipher_done_slow(walk, n);
138 }
139
140 if (err > 0)
141 err = 0;
142
143 walk->total = nbytes;
144 walk->nbytes = nbytes;
145
146 scatterwalk_advance(&walk->in, n);
147 scatterwalk_advance(&walk->out, n);
148 scatterwalk_done(&walk->in, 0, nbytes);
149 scatterwalk_done(&walk->out, 1, nbytes);
150
151 if (nbytes) {
152 crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ?
153 CRYPTO_TFM_REQ_MAY_SLEEP : 0);
154 return skcipher_walk_next(walk);
155 }
156
157 /* Short-circuit for the common/fast path. */
158 if (!((unsigned long)walk->buffer | (unsigned long)walk->page))
159 goto out;
160
161 if (walk->flags & SKCIPHER_WALK_PHYS)
162 goto out;
163
164 if (walk->iv != walk->oiv)
165 memcpy(walk->oiv, walk->iv, walk->ivsize);
166 if (walk->buffer != walk->page)
167 kfree(walk->buffer);
168 if (walk->page)
169 free_page((unsigned long)walk->page);
170
171out:
172 return err;
173}
174EXPORT_SYMBOL_GPL(skcipher_walk_done);
175
176void skcipher_walk_complete(struct skcipher_walk *walk, int err)
177{
178 struct skcipher_walk_buffer *p, *tmp;
179
180 list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
181 u8 *data;
182
183 if (err)
184 goto done;
185
186 data = p->data;
187 if (!data) {
188 data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1);
c821f6ab 189 data = skcipher_get_spot(data, walk->stride);
b286d8b1
HX		 190 }
191
192 scatterwalk_copychunks(data, &p->dst, p->len, 1);
193
c821f6ab 194 if (offset_in_page(p->data) + p->len + walk->stride >
b286d8b1
HX		 195 PAGE_SIZE)
196 free_page((unsigned long)p->data);
197
198done:
199 list_del(&p->entry);
200 kfree(p);
201 }
202
203 if (!err && walk->iv != walk->oiv)
204 memcpy(walk->oiv, walk->iv, walk->ivsize);
205 if (walk->buffer != walk->page)
206 kfree(walk->buffer);
207 if (walk->page)
208 free_page((unsigned long)walk->page);
209}
210EXPORT_SYMBOL_GPL(skcipher_walk_complete);
211
212static void skcipher_queue_write(struct skcipher_walk *walk,
213 struct skcipher_walk_buffer *p)
214{
215 p->dst = walk->out;
216 list_add_tail(&p->entry, &walk->buffers);
217}
218
219static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize)
220{
221 bool phys = walk->flags & SKCIPHER_WALK_PHYS;
222 unsigned alignmask = walk->alignmask;
223 struct skcipher_walk_buffer *p;
224 unsigned a;
225 unsigned n;
226 u8 *buffer;
227 void *v;
228
229 if (!phys) {
18e615ad
AB		 230 if (!walk->buffer)
231 walk->buffer = walk->page;
232 buffer = walk->buffer;
b286d8b1
HX		 233 if (buffer)
234 goto ok;
235 }
236
237 /* Start with the minimum alignment of kmalloc. */
238 a = crypto_tfm_ctx_alignment() - 1;
239 n = bsize;
240
241 if (phys) {
242 /* Calculate the minimum alignment of p->buffer. */
243 a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1;
244 n += sizeof(*p);
245 }
246
247 /* Minimum size to align p->buffer by alignmask. */
248 n += alignmask & ~a;
249
250 /* Minimum size to ensure p->buffer does not straddle a page. */
251 n += (bsize - 1) & ~(alignmask | a);
252
253 v = kzalloc(n, skcipher_walk_gfp(walk));
254 if (!v)
255 return skcipher_walk_done(walk, -ENOMEM);
256
257 if (phys) {
258 p = v;
259 p->len = bsize;
260 skcipher_queue_write(walk, p);
261 buffer = p->buffer;
262 } else {
263 walk->buffer = v;
264 buffer = v;
265 }
266
267ok:
268 walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1);
269 walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize);
270 walk->src.virt.addr = walk->dst.virt.addr;
271
272 scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
273
274 walk->nbytes = bsize;
275 walk->flags |= SKCIPHER_WALK_SLOW;
276
277 return 0;
278}
279
280static int skcipher_next_copy(struct skcipher_walk *walk)
281{
282 struct skcipher_walk_buffer *p;
283 u8 *tmp = walk->page;
284
285 skcipher_map_src(walk);
286 memcpy(tmp, walk->src.virt.addr, walk->nbytes);
287 skcipher_unmap_src(walk);
288
289 walk->src.virt.addr = tmp;
290 walk->dst.virt.addr = tmp;
291
292 if (!(walk->flags & SKCIPHER_WALK_PHYS))
293 return 0;
294
295 p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk));
296 if (!p)
297 return -ENOMEM;
298
299 p->data = walk->page;
300 p->len = walk->nbytes;
301 skcipher_queue_write(walk, p);
302
c821f6ab 303 if (offset_in_page(walk->page) + walk->nbytes + walk->stride >
b286d8b1
HX		 304 PAGE_SIZE)
305 walk->page = NULL;
306 else
307 walk->page += walk->nbytes;
308
309 return 0;
310}
311
312static int skcipher_next_fast(struct skcipher_walk *walk)
313{
314 unsigned long diff;
315
316 walk->src.phys.page = scatterwalk_page(&walk->in);
317 walk->src.phys.offset = offset_in_page(walk->in.offset);
318 walk->dst.phys.page = scatterwalk_page(&walk->out);
319 walk->dst.phys.offset = offset_in_page(walk->out.offset);
320
321 if (walk->flags & SKCIPHER_WALK_PHYS)
322 return 0;
323
324 diff = walk->src.phys.offset - walk->dst.phys.offset;
325 diff |= walk->src.virt.page - walk->dst.virt.page;
326
327 skcipher_map_src(walk);
328 walk->dst.virt.addr = walk->src.virt.addr;
329
330 if (diff) {
331 walk->flags |= SKCIPHER_WALK_DIFF;
332 skcipher_map_dst(walk);
333 }
334
335 return 0;
336}
337
338static int skcipher_walk_next(struct skcipher_walk *walk)
339{
340 unsigned int bsize;
341 unsigned int n;
342 int err;
343
344 walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY |
345 SKCIPHER_WALK_DIFF);
346
347 n = walk->total;
c821f6ab 348 bsize = min(walk->stride, max(n, walk->blocksize));
b286d8b1
HX		 349 n = scatterwalk_clamp(&walk->in, n);
350 n = scatterwalk_clamp(&walk->out, n);
351
352 if (unlikely(n < bsize)) {
353 if (unlikely(walk->total < walk->blocksize))
354 return skcipher_walk_done(walk, -EINVAL);
355
356slow_path:
357 err = skcipher_next_slow(walk, bsize);
358 goto set_phys_lowmem;
359 }
360
361 if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) {
362 if (!walk->page) {
363 gfp_t gfp = skcipher_walk_gfp(walk);
364
365 walk->page = (void *)__get_free_page(gfp);
366 if (!walk->page)
367 goto slow_path;
368 }
369
370 walk->nbytes = min_t(unsigned, n,
371 PAGE_SIZE - offset_in_page(walk->page));
372 walk->flags |= SKCIPHER_WALK_COPY;
373 err = skcipher_next_copy(walk);
374 goto set_phys_lowmem;
375 }
376
377 walk->nbytes = n;
378
379 return skcipher_next_fast(walk);
380
381set_phys_lowmem:
382 if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) {
383 walk->src.phys.page = virt_to_page(walk->src.virt.addr);
384 walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
385 walk->src.phys.offset &= PAGE_SIZE - 1;
386 walk->dst.phys.offset &= PAGE_SIZE - 1;
387 }
388 return err;
389}
390EXPORT_SYMBOL_GPL(skcipher_walk_next);
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
402 aligned_bs = ALIGN(bs, alignmask);
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{
429 walk->nbytes = 0;
430
431 if (WARN_ON_ONCE(in_irq()))
432 return -EDEADLK;
433
434 if (unlikely(!walk->total))
435 return 0;
436
437 walk->buffer = NULL;
438 if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
439 int err = skcipher_copy_iv(walk);
440 if (err)
441 return err;
442 }
443
444 walk->page = NULL;
445 walk->nbytes = walk->total;
446
447 return skcipher_walk_next(walk);
448}
449
450static int skcipher_walk_skcipher(struct skcipher_walk *walk,
451 struct skcipher_request *req)
452{
453 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
454
455 scatterwalk_start(&walk->in, req->src);
456 scatterwalk_start(&walk->out, req->dst);
457
458 walk->total = req->cryptlen;
459 walk->iv = req->iv;
460 walk->oiv = req->iv;
461
462 walk->flags &= ~SKCIPHER_WALK_SLEEP;
463 walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
464 SKCIPHER_WALK_SLEEP : 0;
465
466 walk->blocksize = crypto_skcipher_blocksize(tfm);
c821f6ab 467 walk->stride = crypto_skcipher_walksize(tfm);
b286d8b1
HX		 468 walk->ivsize = crypto_skcipher_ivsize(tfm);
469 walk->alignmask = crypto_skcipher_alignmask(tfm);
470
471 return skcipher_walk_first(walk);
472}
473
474int skcipher_walk_virt(struct skcipher_walk *walk,
475 struct skcipher_request *req, bool atomic)
476{
477 int err;
478
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
3cbf61fb
AB		 512 walk->flags &= ~SKCIPHER_WALK_PHYS;
513
b286d8b1
HX		 514 scatterwalk_start(&walk->in, req->src);
515 scatterwalk_start(&walk->out, req->dst);
516
517 scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
518 scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
519
c14ca838
OM		 520 scatterwalk_done(&walk->in, 0, walk->total);
521 scatterwalk_done(&walk->out, 0, walk->total);
522
b286d8b1
HX		 523 walk->iv = req->iv;
524 walk->oiv = req->iv;
525
526 if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP)
527 walk->flags |= SKCIPHER_WALK_SLEEP;
528 else
529 walk->flags &= ~SKCIPHER_WALK_SLEEP;
530
531 walk->blocksize = crypto_aead_blocksize(tfm);
c821f6ab 532 walk->stride = crypto_aead_chunksize(tfm);
b286d8b1
HX		 533 walk->ivsize = crypto_aead_ivsize(tfm);
534 walk->alignmask = crypto_aead_alignmask(tfm);
535
536 err = skcipher_walk_first(walk);
537
538 if (atomic)
539 walk->flags &= ~SKCIPHER_WALK_SLEEP;
540
541 return err;
542}
34bc085c
HX		 543
544int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
545 bool atomic)
546{
547 walk->total = req->cryptlen;
548
549 return skcipher_walk_aead_common(walk, req, atomic);
550}
b286d8b1
HX		 551EXPORT_SYMBOL_GPL(skcipher_walk_aead);
552
34bc085c
HX		 553int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
554 struct aead_request *req, bool atomic)
555{
556 walk->total = req->cryptlen;
557
558 return skcipher_walk_aead_common(walk, req, atomic);
559}
560EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt);
561
562int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
563 struct aead_request *req, bool atomic)
564{
565 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
566
567 walk->total = req->cryptlen - crypto_aead_authsize(tfm);
568
569 return skcipher_walk_aead_common(walk, req, atomic);
570}
571EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt);
572
7a7ffe65
HX		 573static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg)
574{
575 if (alg->cra_type == &crypto_blkcipher_type)
576 return sizeof(struct crypto_blkcipher *);
577
4e6c3df4
HX		 578 if (alg->cra_type == &crypto_ablkcipher_type ||
579 alg->cra_type == &crypto_givcipher_type)
580 return sizeof(struct crypto_ablkcipher *);
7a7ffe65 581
4e6c3df4 582 return crypto_alg_extsize(alg);
7a7ffe65
HX		 583}
584
585static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm,
586 const u8 *key, unsigned int keylen)
587{
588 struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm);
589 struct crypto_blkcipher *blkcipher = *ctx;
590 int err;
591
592 crypto_blkcipher_clear_flags(blkcipher, ~0);
593 crypto_blkcipher_set_flags(blkcipher, crypto_skcipher_get_flags(tfm) &
594 CRYPTO_TFM_REQ_MASK);
595 err = crypto_blkcipher_setkey(blkcipher, key, keylen);
596 crypto_skcipher_set_flags(tfm, crypto_blkcipher_get_flags(blkcipher) &
597 CRYPTO_TFM_RES_MASK);
598
599 return err;
600}
601
602static int skcipher_crypt_blkcipher(struct skcipher_request *req,
603 int (*crypt)(struct blkcipher_desc *,
604 struct scatterlist *,
605 struct scatterlist *,
606 unsigned int))
607{
608 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
609 struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm);
610 struct blkcipher_desc desc = {
611 .tfm = *ctx,
612 .info = req->iv,
613 .flags = req->base.flags,
614 };
615
616
617 return crypt(&desc, req->dst, req->src, req->cryptlen);
618}
619
620static int skcipher_encrypt_blkcipher(struct skcipher_request *req)
621{
622 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
623 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
624 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
625
626 return skcipher_crypt_blkcipher(req, alg->encrypt);
627}
628
629static int skcipher_decrypt_blkcipher(struct skcipher_request *req)
630{
631 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
632 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
633 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
634
635 return skcipher_crypt_blkcipher(req, alg->decrypt);
636}
637
638static void crypto_exit_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
639{
640 struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm);
641
642 crypto_free_blkcipher(*ctx);
643}
644
ecdd6bed 645static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
7a7ffe65
HX		 646{
647 struct crypto_alg *calg = tfm->__crt_alg;
648 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
649 struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm);
650 struct crypto_blkcipher *blkcipher;
651 struct crypto_tfm *btfm;
652
653 if (!crypto_mod_get(calg))
654 return -EAGAIN;
655
656 btfm = __crypto_alloc_tfm(calg, CRYPTO_ALG_TYPE_BLKCIPHER,
657 CRYPTO_ALG_TYPE_MASK);
658 if (IS_ERR(btfm)) {
659 crypto_mod_put(calg);
660 return PTR_ERR(btfm);
661 }
662
663 blkcipher = __crypto_blkcipher_cast(btfm);
664 *ctx = blkcipher;
665 tfm->exit = crypto_exit_skcipher_ops_blkcipher;
666
667 skcipher->setkey = skcipher_setkey_blkcipher;
668 skcipher->encrypt = skcipher_encrypt_blkcipher;
669 skcipher->decrypt = skcipher_decrypt_blkcipher;
670
671 skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher);
973fb3fb 672 skcipher->keysize = calg->cra_blkcipher.max_keysize;
7a7ffe65
HX		 673
674 return 0;
675}
676
677static int skcipher_setkey_ablkcipher(struct crypto_skcipher *tfm,
678 const u8 *key, unsigned int keylen)
679{
680 struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm);
681 struct crypto_ablkcipher *ablkcipher = *ctx;
682 int err;
683
684 crypto_ablkcipher_clear_flags(ablkcipher, ~0);
685 crypto_ablkcipher_set_flags(ablkcipher,
686 crypto_skcipher_get_flags(tfm) &
687 CRYPTO_TFM_REQ_MASK);
688 err = crypto_ablkcipher_setkey(ablkcipher, key, keylen);
689 crypto_skcipher_set_flags(tfm,
690 crypto_ablkcipher_get_flags(ablkcipher) &
691 CRYPTO_TFM_RES_MASK);
692
693 return err;
694}
695
696static int skcipher_crypt_ablkcipher(struct skcipher_request *req,
697 int (*crypt)(struct ablkcipher_request *))
698{
699 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
700 struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm);
701 struct ablkcipher_request *subreq = skcipher_request_ctx(req);
702
703 ablkcipher_request_set_tfm(subreq, *ctx);
704 ablkcipher_request_set_callback(subreq, skcipher_request_flags(req),
705 req->base.complete, req->base.data);
706 ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
707 req->iv);
708
709 return crypt(subreq);
710}
711
712static int skcipher_encrypt_ablkcipher(struct skcipher_request *req)
713{
714 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
715 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
716 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
717
718 return skcipher_crypt_ablkcipher(req, alg->encrypt);
719}
720
721static int skcipher_decrypt_ablkcipher(struct skcipher_request *req)
722{
723 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
724 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
725 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
726
727 return skcipher_crypt_ablkcipher(req, alg->decrypt);
728}
729
730static void crypto_exit_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
731{
732 struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm);
733
734 crypto_free_ablkcipher(*ctx);
735}
736
ecdd6bed 737static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
7a7ffe65
HX		 738{
739 struct crypto_alg *calg = tfm->__crt_alg;
740 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
741 struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm);
742 struct crypto_ablkcipher *ablkcipher;
743 struct crypto_tfm *abtfm;
744
745 if (!crypto_mod_get(calg))
746 return -EAGAIN;
747
748 abtfm = __crypto_alloc_tfm(calg, 0, 0);
749 if (IS_ERR(abtfm)) {
750 crypto_mod_put(calg);
751 return PTR_ERR(abtfm);
752 }
753
754 ablkcipher = __crypto_ablkcipher_cast(abtfm);
755 *ctx = ablkcipher;
756 tfm->exit = crypto_exit_skcipher_ops_ablkcipher;
757
758 skcipher->setkey = skcipher_setkey_ablkcipher;
759 skcipher->encrypt = skcipher_encrypt_ablkcipher;
760 skcipher->decrypt = skcipher_decrypt_ablkcipher;
761
762 skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
763 skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) +
764 sizeof(struct ablkcipher_request);
973fb3fb 765 skcipher->keysize = calg->cra_ablkcipher.max_keysize;
7a7ffe65
HX		 766
767 return 0;
768}
769
9933e113
HX		 770static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm,
771 const u8 *key, unsigned int keylen)
772{
773 unsigned long alignmask = crypto_skcipher_alignmask(tfm);
774 struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
775 u8 *buffer, *alignbuffer;
776 unsigned long absize;
777 int ret;
778
779 absize = keylen + alignmask;
780 buffer = kmalloc(absize, GFP_ATOMIC);
781 if (!buffer)
782 return -ENOMEM;
783
784 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
785 memcpy(alignbuffer, key, keylen);
786 ret = cipher->setkey(tfm, alignbuffer, keylen);
787 kzfree(buffer);
788 return ret;
789}
790
791static int skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
792 unsigned int keylen)
793{
794 struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
795 unsigned long alignmask = crypto_skcipher_alignmask(tfm);
796
797 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
798 crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
799 return -EINVAL;
800 }
801
802 if ((unsigned long)key & alignmask)
803 return skcipher_setkey_unaligned(tfm, key, keylen);
804
805 return cipher->setkey(tfm, key, keylen);
806}
807
4e6c3df4
HX		 808static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm)
809{
810 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
811 struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
812
813 alg->exit(skcipher);
814}
815
7a7ffe65
HX		 816static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
817{
4e6c3df4
HX		 818 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
819 struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
820
7a7ffe65
HX		 821 if (tfm->__crt_alg->cra_type == &crypto_blkcipher_type)
822 return crypto_init_skcipher_ops_blkcipher(tfm);
823
4e6c3df4
HX		 824 if (tfm->__crt_alg->cra_type == &crypto_ablkcipher_type ||
825 tfm->__crt_alg->cra_type == &crypto_givcipher_type)
826 return crypto_init_skcipher_ops_ablkcipher(tfm);
827
9933e113 828 skcipher->setkey = skcipher_setkey;
4e6c3df4
HX		 829 skcipher->encrypt = alg->encrypt;
830 skcipher->decrypt = alg->decrypt;
831 skcipher->ivsize = alg->ivsize;
832 skcipher->keysize = alg->max_keysize;
833
834 if (alg->exit)
835 skcipher->base.exit = crypto_skcipher_exit_tfm;
7a7ffe65 836
4e6c3df4
HX		 837 if (alg->init)
838 return alg->init(skcipher);
839
840 return 0;
841}
842
843static void crypto_skcipher_free_instance(struct crypto_instance *inst)
844{
845 struct skcipher_instance *skcipher =
846 container_of(inst, struct skcipher_instance, s.base);
847
848 skcipher->free(skcipher);
849}
850
851static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
d8c34b94 852 __maybe_unused;
4e6c3df4
HX		 853static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
854{
855 struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
856 base);
857
858 seq_printf(m, "type : skcipher\n");
859 seq_printf(m, "async : %s\n",
860 alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no");
861 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
862 seq_printf(m, "min keysize : %u\n", skcipher->min_keysize);
863 seq_printf(m, "max keysize : %u\n", skcipher->max_keysize);
864 seq_printf(m, "ivsize : %u\n", skcipher->ivsize);
865 seq_printf(m, "chunksize : %u\n", skcipher->chunksize);
c821f6ab 866 seq_printf(m, "walksize : %u\n", skcipher->walksize);
7a7ffe65
HX		 867}
868
4e6c3df4
HX		 869#ifdef CONFIG_NET
870static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
871{
872 struct crypto_report_blkcipher rblkcipher;
873 struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
874 base);
875
876 strncpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type));
877 strncpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));
878
879 rblkcipher.blocksize = alg->cra_blocksize;
880 rblkcipher.min_keysize = skcipher->min_keysize;
881 rblkcipher.max_keysize = skcipher->max_keysize;
882 rblkcipher.ivsize = skcipher->ivsize;
883
884 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
885 sizeof(struct crypto_report_blkcipher), &rblkcipher))
886 goto nla_put_failure;
887 return 0;
888
889nla_put_failure:
890 return -EMSGSIZE;
891}
892#else
893static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
894{
895 return -ENOSYS;
896}
897#endif
898
7a7ffe65
HX		 899static const struct crypto_type crypto_skcipher_type2 = {
900 .extsize = crypto_skcipher_extsize,
901 .init_tfm = crypto_skcipher_init_tfm,
4e6c3df4
HX		 902 .free = crypto_skcipher_free_instance,
903#ifdef CONFIG_PROC_FS
904 .show = crypto_skcipher_show,
905#endif
906 .report = crypto_skcipher_report,
7a7ffe65
HX		 907 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
908 .maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK,
4e6c3df4 909 .type = CRYPTO_ALG_TYPE_SKCIPHER,
7a7ffe65
HX		 910 .tfmsize = offsetof(struct crypto_skcipher, base),
911};
912
3a01d0ee 913int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
4e6c3df4
HX		 914 const char *name, u32 type, u32 mask)
915{
916 spawn->base.frontend = &crypto_skcipher_type2;
917 return crypto_grab_spawn(&spawn->base, name, type, mask);
918}
3a01d0ee 919EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
4e6c3df4 920
7a7ffe65
HX		 921struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
922 u32 type, u32 mask)
923{
924 return crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask);
925}
926EXPORT_SYMBOL_GPL(crypto_alloc_skcipher);
927
4e6c3df4
HX		 928int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask)
929{
930 return crypto_type_has_alg(alg_name, &crypto_skcipher_type2,
931 type, mask);
932}
933EXPORT_SYMBOL_GPL(crypto_has_skcipher2);
934
935static int skcipher_prepare_alg(struct skcipher_alg *alg)
936{
937 struct crypto_alg *base = &alg->base;
938
c821f6ab
AB		 939 if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
940 alg->walksize > PAGE_SIZE / 8)
4e6c3df4
HX		 941 return -EINVAL;
942
943 if (!alg->chunksize)
944 alg->chunksize = base->cra_blocksize;
c821f6ab
AB		 945 if (!alg->walksize)
946 alg->walksize = alg->chunksize;
4e6c3df4
HX		 947
948 base->cra_type = &crypto_skcipher_type2;
949 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
950 base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
951
952 return 0;
953}
954
955int crypto_register_skcipher(struct skcipher_alg *alg)
956{
957 struct crypto_alg *base = &alg->base;
958 int err;
959
960 err = skcipher_prepare_alg(alg);
961 if (err)
962 return err;
963
964 return crypto_register_alg(base);
965}
966EXPORT_SYMBOL_GPL(crypto_register_skcipher);
967
968void crypto_unregister_skcipher(struct skcipher_alg *alg)
969{
970 crypto_unregister_alg(&alg->base);
971}
972EXPORT_SYMBOL_GPL(crypto_unregister_skcipher);
973
974int crypto_register_skciphers(struct skcipher_alg *algs, int count)
975{
976 int i, ret;
977
978 for (i = 0; i < count; i++) {
979 ret = crypto_register_skcipher(&algs[i]);
980 if (ret)
981 goto err;
982 }
983
984 return 0;
985
986err:
987 for (--i; i >= 0; --i)
988 crypto_unregister_skcipher(&algs[i]);
989
990 return ret;
991}
992EXPORT_SYMBOL_GPL(crypto_register_skciphers);
993
994void crypto_unregister_skciphers(struct skcipher_alg *algs, int count)
995{
996 int i;
997
998 for (i = count - 1; i >= 0; --i)
999 crypto_unregister_skcipher(&algs[i]);
1000}
1001EXPORT_SYMBOL_GPL(crypto_unregister_skciphers);
1002
1003int skcipher_register_instance(struct crypto_template *tmpl,
1004 struct skcipher_instance *inst)
1005{
1006 int err;
1007
1008 err = skcipher_prepare_alg(&inst->alg);
1009 if (err)
1010 return err;
1011
1012 return crypto_register_instance(tmpl, skcipher_crypto_instance(inst));
1013}
1014EXPORT_SYMBOL_GPL(skcipher_register_instance);
1015
7a7ffe65
HX		 1016MODULE_LICENSE("GPL");
1017MODULE_DESCRIPTION("Symmetric key cipher type");
Linux 6.x block layer and io_uring tree(s)