blob: 4faa0fd53b0c120d39022ad726dbbe2c74f787bd [file] [log] [blame]
Herbert Xu7a7ffe62015-08-20 15:21:45 +08001/*
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
Herbert Xub286d8b2016-11-22 20:08:12 +080017#include <crypto/internal/aead.h>
Herbert Xu7a7ffe62015-08-20 15:21:45 +080018#include <crypto/internal/skcipher.h>
Herbert Xub286d8b2016-11-22 20:08:12 +080019#include <crypto/scatterwalk.h>
Herbert Xu7a7ffe62015-08-20 15:21:45 +080020#include <linux/bug.h>
Herbert Xu4e6c3df2016-07-12 13:17:31 +080021#include <linux/cryptouser.h>
Gideon Israel Dsouzad8c34b92016-12-31 21:26:23 +053022#include <linux/compiler.h>
Herbert Xub286d8b2016-11-22 20:08:12 +080023#include <linux/list.h>
Herbert Xu7a7ffe62015-08-20 15:21:45 +080024#include <linux/module.h>
Herbert Xu4e6c3df2016-07-12 13:17:31 +080025#include <linux/rtnetlink.h>
26#include <linux/seq_file.h>
27#include <net/netlink.h>
Herbert Xu7a7ffe62015-08-20 15:21:45 +080028
29#include "internal.h"
30
Herbert Xub286d8b2016-11-22 20:08:12 +080031enum {
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);
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000189 data = skcipher_get_spot(data, walk->stride);
Herbert Xub286d8b2016-11-22 20:08:12 +0800190 }
191
192 scatterwalk_copychunks(data, &p->dst, p->len, 1);
193
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000194 if (offset_in_page(p->data) + p->len + walk->stride >
Herbert Xub286d8b2016-11-22 20:08:12 +0800195 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) {
Ard Biesheuvel18e615a2016-12-13 13:34:02 +0000230 if (!walk->buffer)
231 walk->buffer = walk->page;
232 buffer = walk->buffer;
Herbert Xub286d8b2016-11-22 20:08:12 +0800233 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
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000303 if (offset_in_page(walk->page) + walk->nbytes + walk->stride >
Herbert Xub286d8b2016-11-22 20:08:12 +0800304 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;
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000348 bsize = min(walk->stride, max(n, walk->blocksize));
Herbert Xub286d8b2016-11-22 20:08:12 +0800349 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;
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000397 unsigned bs = walk->stride;
Herbert Xub286d8b2016-11-22 20:08:12 +0800398 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);
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000467 walk->stride = crypto_skcipher_walksize(tfm);
Herbert Xub286d8b2016-11-22 20:08:12 +0800468 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
Herbert Xu34bc0852016-11-30 21:14:07 +0800506static int skcipher_walk_aead_common(struct skcipher_walk *walk,
507 struct aead_request *req, bool atomic)
Herbert Xub286d8b2016-11-22 20:08:12 +0800508{
509 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
510 int err;
511
Ard Biesheuvel3cbf61f2016-11-29 13:05:31 +0000512 walk->flags &= ~SKCIPHER_WALK_PHYS;
513
Herbert Xub286d8b2016-11-22 20:08:12 +0800514 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
Herbert Xub286d8b2016-11-22 20:08:12 +0800520 walk->iv = req->iv;
521 walk->oiv = req->iv;
522
523 if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP)
524 walk->flags |= SKCIPHER_WALK_SLEEP;
525 else
526 walk->flags &= ~SKCIPHER_WALK_SLEEP;
527
528 walk->blocksize = crypto_aead_blocksize(tfm);
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000529 walk->stride = crypto_aead_chunksize(tfm);
Herbert Xub286d8b2016-11-22 20:08:12 +0800530 walk->ivsize = crypto_aead_ivsize(tfm);
531 walk->alignmask = crypto_aead_alignmask(tfm);
532
533 err = skcipher_walk_first(walk);
534
535 if (atomic)
536 walk->flags &= ~SKCIPHER_WALK_SLEEP;
537
538 return err;
539}
Herbert Xu34bc0852016-11-30 21:14:07 +0800540
541int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req,
542 bool atomic)
543{
544 walk->total = req->cryptlen;
545
546 return skcipher_walk_aead_common(walk, req, atomic);
547}
Herbert Xub286d8b2016-11-22 20:08:12 +0800548EXPORT_SYMBOL_GPL(skcipher_walk_aead);
549
Herbert Xu34bc0852016-11-30 21:14:07 +0800550int 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
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800570static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg)
571{
572 if (alg->cra_type == &crypto_blkcipher_type)
573 return sizeof(struct crypto_blkcipher *);
574
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800575 if (alg->cra_type == &crypto_ablkcipher_type ||
576 alg->cra_type == &crypto_givcipher_type)
577 return sizeof(struct crypto_ablkcipher *);
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800578
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800579 return crypto_alg_extsize(alg);
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800580}
581
582static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm,
583 const u8 *key, unsigned int keylen)
584{
585 struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm);
586 struct crypto_blkcipher *blkcipher = *ctx;
587 int err;
588
589 crypto_blkcipher_clear_flags(blkcipher, ~0);
590 crypto_blkcipher_set_flags(blkcipher, crypto_skcipher_get_flags(tfm) &
591 CRYPTO_TFM_REQ_MASK);
592 err = crypto_blkcipher_setkey(blkcipher, key, keylen);
593 crypto_skcipher_set_flags(tfm, crypto_blkcipher_get_flags(blkcipher) &
594 CRYPTO_TFM_RES_MASK);
595
596 return err;
597}
598
599static int skcipher_crypt_blkcipher(struct skcipher_request *req,
600 int (*crypt)(struct blkcipher_desc *,
601 struct scatterlist *,
602 struct scatterlist *,
603 unsigned int))
604{
605 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
606 struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm);
607 struct blkcipher_desc desc = {
608 .tfm = *ctx,
609 .info = req->iv,
610 .flags = req->base.flags,
611 };
612
613
614 return crypt(&desc, req->dst, req->src, req->cryptlen);
615}
616
617static int skcipher_encrypt_blkcipher(struct skcipher_request *req)
618{
619 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
620 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
621 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
622
623 return skcipher_crypt_blkcipher(req, alg->encrypt);
624}
625
626static int skcipher_decrypt_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->decrypt);
633}
634
635static void crypto_exit_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
636{
637 struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm);
638
639 crypto_free_blkcipher(*ctx);
640}
641
Geliang Tangecdd6be2015-09-27 22:47:05 +0800642static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm)
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800643{
644 struct crypto_alg *calg = tfm->__crt_alg;
645 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
646 struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm);
647 struct crypto_blkcipher *blkcipher;
648 struct crypto_tfm *btfm;
649
650 if (!crypto_mod_get(calg))
651 return -EAGAIN;
652
653 btfm = __crypto_alloc_tfm(calg, CRYPTO_ALG_TYPE_BLKCIPHER,
654 CRYPTO_ALG_TYPE_MASK);
655 if (IS_ERR(btfm)) {
656 crypto_mod_put(calg);
657 return PTR_ERR(btfm);
658 }
659
660 blkcipher = __crypto_blkcipher_cast(btfm);
661 *ctx = blkcipher;
662 tfm->exit = crypto_exit_skcipher_ops_blkcipher;
663
664 skcipher->setkey = skcipher_setkey_blkcipher;
665 skcipher->encrypt = skcipher_encrypt_blkcipher;
666 skcipher->decrypt = skcipher_decrypt_blkcipher;
667
668 skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher);
Herbert Xu973fb3f2016-01-21 17:10:56 +0800669 skcipher->keysize = calg->cra_blkcipher.max_keysize;
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800670
671 return 0;
672}
673
674static int skcipher_setkey_ablkcipher(struct crypto_skcipher *tfm,
675 const u8 *key, unsigned int keylen)
676{
677 struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm);
678 struct crypto_ablkcipher *ablkcipher = *ctx;
679 int err;
680
681 crypto_ablkcipher_clear_flags(ablkcipher, ~0);
682 crypto_ablkcipher_set_flags(ablkcipher,
683 crypto_skcipher_get_flags(tfm) &
684 CRYPTO_TFM_REQ_MASK);
685 err = crypto_ablkcipher_setkey(ablkcipher, key, keylen);
686 crypto_skcipher_set_flags(tfm,
687 crypto_ablkcipher_get_flags(ablkcipher) &
688 CRYPTO_TFM_RES_MASK);
689
690 return err;
691}
692
693static int skcipher_crypt_ablkcipher(struct skcipher_request *req,
694 int (*crypt)(struct ablkcipher_request *))
695{
696 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
697 struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm);
698 struct ablkcipher_request *subreq = skcipher_request_ctx(req);
699
700 ablkcipher_request_set_tfm(subreq, *ctx);
701 ablkcipher_request_set_callback(subreq, skcipher_request_flags(req),
702 req->base.complete, req->base.data);
703 ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
704 req->iv);
705
706 return crypt(subreq);
707}
708
709static int skcipher_encrypt_ablkcipher(struct skcipher_request *req)
710{
711 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
712 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
713 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
714
715 return skcipher_crypt_ablkcipher(req, alg->encrypt);
716}
717
718static int skcipher_decrypt_ablkcipher(struct skcipher_request *req)
719{
720 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
721 struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
722 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
723
724 return skcipher_crypt_ablkcipher(req, alg->decrypt);
725}
726
727static void crypto_exit_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
728{
729 struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm);
730
731 crypto_free_ablkcipher(*ctx);
732}
733
Geliang Tangecdd6be2015-09-27 22:47:05 +0800734static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm)
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800735{
736 struct crypto_alg *calg = tfm->__crt_alg;
737 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
738 struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm);
739 struct crypto_ablkcipher *ablkcipher;
740 struct crypto_tfm *abtfm;
741
742 if (!crypto_mod_get(calg))
743 return -EAGAIN;
744
745 abtfm = __crypto_alloc_tfm(calg, 0, 0);
746 if (IS_ERR(abtfm)) {
747 crypto_mod_put(calg);
748 return PTR_ERR(abtfm);
749 }
750
751 ablkcipher = __crypto_ablkcipher_cast(abtfm);
752 *ctx = ablkcipher;
753 tfm->exit = crypto_exit_skcipher_ops_ablkcipher;
754
755 skcipher->setkey = skcipher_setkey_ablkcipher;
756 skcipher->encrypt = skcipher_encrypt_ablkcipher;
757 skcipher->decrypt = skcipher_decrypt_ablkcipher;
758
759 skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
760 skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) +
761 sizeof(struct ablkcipher_request);
Herbert Xu973fb3f2016-01-21 17:10:56 +0800762 skcipher->keysize = calg->cra_ablkcipher.max_keysize;
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800763
764 return 0;
765}
766
Herbert Xu9933e112017-05-10 03:48:23 +0800767static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm,
768 const u8 *key, unsigned int keylen)
769{
770 unsigned long alignmask = crypto_skcipher_alignmask(tfm);
771 struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
772 u8 *buffer, *alignbuffer;
773 unsigned long absize;
774 int ret;
775
776 absize = keylen + alignmask;
777 buffer = kmalloc(absize, GFP_ATOMIC);
778 if (!buffer)
779 return -ENOMEM;
780
781 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
782 memcpy(alignbuffer, key, keylen);
783 ret = cipher->setkey(tfm, alignbuffer, keylen);
784 kzfree(buffer);
785 return ret;
786}
787
788static int skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
789 unsigned int keylen)
790{
791 struct skcipher_alg *cipher = crypto_skcipher_alg(tfm);
792 unsigned long alignmask = crypto_skcipher_alignmask(tfm);
793
794 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
795 crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
796 return -EINVAL;
797 }
798
799 if ((unsigned long)key & alignmask)
800 return skcipher_setkey_unaligned(tfm, key, keylen);
801
802 return cipher->setkey(tfm, key, keylen);
803}
804
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800805static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm)
806{
807 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
808 struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
809
810 alg->exit(skcipher);
811}
812
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800813static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
814{
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800815 struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
816 struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
817
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800818 if (tfm->__crt_alg->cra_type == &crypto_blkcipher_type)
819 return crypto_init_skcipher_ops_blkcipher(tfm);
820
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800821 if (tfm->__crt_alg->cra_type == &crypto_ablkcipher_type ||
822 tfm->__crt_alg->cra_type == &crypto_givcipher_type)
823 return crypto_init_skcipher_ops_ablkcipher(tfm);
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800824
Herbert Xu9933e112017-05-10 03:48:23 +0800825 skcipher->setkey = skcipher_setkey;
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800826 skcipher->encrypt = alg->encrypt;
827 skcipher->decrypt = alg->decrypt;
828 skcipher->ivsize = alg->ivsize;
829 skcipher->keysize = alg->max_keysize;
830
831 if (alg->exit)
832 skcipher->base.exit = crypto_skcipher_exit_tfm;
833
834 if (alg->init)
835 return alg->init(skcipher);
836
837 return 0;
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800838}
839
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800840static void crypto_skcipher_free_instance(struct crypto_instance *inst)
841{
842 struct skcipher_instance *skcipher =
843 container_of(inst, struct skcipher_instance, s.base);
844
845 skcipher->free(skcipher);
846}
847
848static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
Gideon Israel Dsouzad8c34b92016-12-31 21:26:23 +0530849 __maybe_unused;
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800850static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg)
851{
852 struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
853 base);
854
855 seq_printf(m, "type : skcipher\n");
856 seq_printf(m, "async : %s\n",
857 alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no");
858 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
859 seq_printf(m, "min keysize : %u\n", skcipher->min_keysize);
860 seq_printf(m, "max keysize : %u\n", skcipher->max_keysize);
861 seq_printf(m, "ivsize : %u\n", skcipher->ivsize);
862 seq_printf(m, "chunksize : %u\n", skcipher->chunksize);
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000863 seq_printf(m, "walksize : %u\n", skcipher->walksize);
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800864}
865
866#ifdef CONFIG_NET
867static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
868{
869 struct crypto_report_blkcipher rblkcipher;
870 struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg,
871 base);
872
873 strncpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type));
874 strncpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));
875
876 rblkcipher.blocksize = alg->cra_blocksize;
877 rblkcipher.min_keysize = skcipher->min_keysize;
878 rblkcipher.max_keysize = skcipher->max_keysize;
879 rblkcipher.ivsize = skcipher->ivsize;
880
881 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
882 sizeof(struct crypto_report_blkcipher), &rblkcipher))
883 goto nla_put_failure;
884 return 0;
885
886nla_put_failure:
887 return -EMSGSIZE;
888}
889#else
890static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
891{
892 return -ENOSYS;
893}
894#endif
895
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800896static const struct crypto_type crypto_skcipher_type2 = {
897 .extsize = crypto_skcipher_extsize,
898 .init_tfm = crypto_skcipher_init_tfm,
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800899 .free = crypto_skcipher_free_instance,
900#ifdef CONFIG_PROC_FS
901 .show = crypto_skcipher_show,
902#endif
903 .report = crypto_skcipher_report,
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800904 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
905 .maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK,
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800906 .type = CRYPTO_ALG_TYPE_SKCIPHER,
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800907 .tfmsize = offsetof(struct crypto_skcipher, base),
908};
909
Herbert Xu3a01d0e2016-07-12 13:17:50 +0800910int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800911 const char *name, u32 type, u32 mask)
912{
913 spawn->base.frontend = &crypto_skcipher_type2;
914 return crypto_grab_spawn(&spawn->base, name, type, mask);
915}
Herbert Xu3a01d0e2016-07-12 13:17:50 +0800916EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800917
Herbert Xu7a7ffe62015-08-20 15:21:45 +0800918struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
919 u32 type, u32 mask)
920{
921 return crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask);
922}
923EXPORT_SYMBOL_GPL(crypto_alloc_skcipher);
924
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800925int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask)
926{
927 return crypto_type_has_alg(alg_name, &crypto_skcipher_type2,
928 type, mask);
929}
930EXPORT_SYMBOL_GPL(crypto_has_skcipher2);
931
932static int skcipher_prepare_alg(struct skcipher_alg *alg)
933{
934 struct crypto_alg *base = &alg->base;
935
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000936 if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 ||
937 alg->walksize > PAGE_SIZE / 8)
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800938 return -EINVAL;
939
940 if (!alg->chunksize)
941 alg->chunksize = base->cra_blocksize;
Ard Biesheuvelc821f6a2016-12-29 14:09:08 +0000942 if (!alg->walksize)
943 alg->walksize = alg->chunksize;
Herbert Xu4e6c3df2016-07-12 13:17:31 +0800944
945 base->cra_type = &crypto_skcipher_type2;
946 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
947 base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER;
948
949 return 0;
950}
951
952int crypto_register_skcipher(struct skcipher_alg *alg)
953{
954 struct crypto_alg *base = &alg->base;
955 int err;
956
957 err = skcipher_prepare_alg(alg);
958 if (err)
959 return err;
960
961 return crypto_register_alg(base);
962}
963EXPORT_SYMBOL_GPL(crypto_register_skcipher);
964
965void crypto_unregister_skcipher(struct skcipher_alg *alg)
966{
967 crypto_unregister_alg(&alg->base);
968}
969EXPORT_SYMBOL_GPL(crypto_unregister_skcipher);
970
971int crypto_register_skciphers(struct skcipher_alg *algs, int count)
972{
973 int i, ret;
974
975 for (i = 0; i < count; i++) {
976 ret = crypto_register_skcipher(&algs[i]);
977 if (ret)
978 goto err;
979 }
980
981 return 0;
982
983err:
984 for (--i; i >= 0; --i)
985 crypto_unregister_skcipher(&algs[i]);
986
987 return ret;
988}
989EXPORT_SYMBOL_GPL(crypto_register_skciphers);
990
991void crypto_unregister_skciphers(struct skcipher_alg *algs, int count)
992{
993 int i;
994
995 for (i = count - 1; i >= 0; --i)
996 crypto_unregister_skcipher(&algs[i]);
997}
998EXPORT_SYMBOL_GPL(crypto_unregister_skciphers);
999
1000int skcipher_register_instance(struct crypto_template *tmpl,
1001 struct skcipher_instance *inst)
1002{
1003 int err;
1004
1005 err = skcipher_prepare_alg(&inst->alg);
1006 if (err)
1007 return err;
1008
1009 return crypto_register_instance(tmpl, skcipher_crypto_instance(inst));
1010}
1011EXPORT_SYMBOL_GPL(skcipher_register_instance);
1012
Herbert Xu7a7ffe62015-08-20 15:21:45 +08001013MODULE_LICENSE("GPL");
1014MODULE_DESCRIPTION("Symmetric key cipher type");