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1/*
2 * Block chaining 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) 2006 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
17#include <crypto/aead.h>
18#include <crypto/internal/skcipher.h>
19#include <crypto/scatterwalk.h>
20#include <linux/errno.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/seq_file.h>
24#include <linux/slab.h>
25#include <linux/string.h>
26#include <linux/cryptouser.h>
27#include <linux/compiler.h>
28#include <net/netlink.h>
29
30#include "internal.h"
31
32enum {
33 BLKCIPHER_WALK_PHYS = 1 << 0,
34 BLKCIPHER_WALK_SLOW = 1 << 1,
35 BLKCIPHER_WALK_COPY = 1 << 2,
36 BLKCIPHER_WALK_DIFF = 1 << 3,
37};
38
39static int blkcipher_walk_next(struct blkcipher_desc *desc,
40 struct blkcipher_walk *walk);
41static int blkcipher_walk_first(struct blkcipher_desc *desc,
42 struct blkcipher_walk *walk);
43
44static inline void blkcipher_map_src(struct blkcipher_walk *walk)
45{
46 walk->src.virt.addr = scatterwalk_map(&walk->in);
47}
48
49static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
50{
51 walk->dst.virt.addr = scatterwalk_map(&walk->out);
52}
53
54static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
55{
56 scatterwalk_unmap(walk->src.virt.addr);
57}
58
59static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
60{
61 scatterwalk_unmap(walk->dst.virt.addr);
62}
63
64/* Get a spot of the specified length that does not straddle a page.
65 * The caller needs to ensure that there is enough space for this operation.
66 */
67static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len)
68{
69 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
70 return max(start, end_page);
71}
72
73static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk,
74 unsigned int bsize)
75{
76 u8 *addr;
77
78 addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
79 addr = blkcipher_get_spot(addr, bsize);
80 scatterwalk_copychunks(addr, &walk->out, bsize, 1);
81 return bsize;
82}
83
84static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
85 unsigned int n)
86{
87 if (walk->flags & BLKCIPHER_WALK_COPY) {
88 blkcipher_map_dst(walk);
89 memcpy(walk->dst.virt.addr, walk->page, n);
90 blkcipher_unmap_dst(walk);
91 } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
92 if (walk->flags & BLKCIPHER_WALK_DIFF)
93 blkcipher_unmap_dst(walk);
94 blkcipher_unmap_src(walk);
95 }
96
97 scatterwalk_advance(&walk->in, n);
98 scatterwalk_advance(&walk->out, n);
99
100 return n;
101}
102
103int blkcipher_walk_done(struct blkcipher_desc *desc,
104 struct blkcipher_walk *walk, int err)
105{
106 unsigned int nbytes = 0;
107
108 if (likely(err >= 0)) {
109 unsigned int n = walk->nbytes - err;
110
111 if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
112 n = blkcipher_done_fast(walk, n);
113 else if (WARN_ON(err)) {
114 err = -EINVAL;
115 goto err;
116 } else
117 n = blkcipher_done_slow(walk, n);
118
119 nbytes = walk->total - n;
120 err = 0;
121 }
122
123 scatterwalk_done(&walk->in, 0, nbytes);
124 scatterwalk_done(&walk->out, 1, nbytes);
125
126err:
127 walk->total = nbytes;
128 walk->nbytes = nbytes;
129
130 if (nbytes) {
131 crypto_yield(desc->flags);
132 return blkcipher_walk_next(desc, walk);
133 }
134
135 if (walk->iv != desc->info)
136 memcpy(desc->info, walk->iv, walk->ivsize);
137 if (walk->buffer != walk->page)
138 kfree(walk->buffer);
139 if (walk->page)
140 free_page((unsigned long)walk->page);
141
142 return err;
143}
144EXPORT_SYMBOL_GPL(blkcipher_walk_done);
145
146static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
147 struct blkcipher_walk *walk,
148 unsigned int bsize,
149 unsigned int alignmask)
150{
151 unsigned int n;
152 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
153
154 if (walk->buffer)
155 goto ok;
156
157 walk->buffer = walk->page;
158 if (walk->buffer)
159 goto ok;
160
161 n = aligned_bsize * 3 - (alignmask + 1) +
162 (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
163 walk->buffer = kmalloc(n, GFP_ATOMIC);
164 if (!walk->buffer)
165 return blkcipher_walk_done(desc, walk, -ENOMEM);
166
167ok:
168 walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
169 alignmask + 1);
170 walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
171 walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
172 aligned_bsize, bsize);
173
174 scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
175
176 walk->nbytes = bsize;
177 walk->flags |= BLKCIPHER_WALK_SLOW;
178
179 return 0;
180}
181
182static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
183{
184 u8 *tmp = walk->page;
185
186 blkcipher_map_src(walk);
187 memcpy(tmp, walk->src.virt.addr, walk->nbytes);
188 blkcipher_unmap_src(walk);
189
190 walk->src.virt.addr = tmp;
191 walk->dst.virt.addr = tmp;
192
193 return 0;
194}
195
196static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
197 struct blkcipher_walk *walk)
198{
199 unsigned long diff;
200
201 walk->src.phys.page = scatterwalk_page(&walk->in);
202 walk->src.phys.offset = offset_in_page(walk->in.offset);
203 walk->dst.phys.page = scatterwalk_page(&walk->out);
204 walk->dst.phys.offset = offset_in_page(walk->out.offset);
205
206 if (walk->flags & BLKCIPHER_WALK_PHYS)
207 return 0;
208
209 diff = walk->src.phys.offset - walk->dst.phys.offset;
210 diff |= walk->src.virt.page - walk->dst.virt.page;
211
212 blkcipher_map_src(walk);
213 walk->dst.virt.addr = walk->src.virt.addr;
214
215 if (diff) {
216 walk->flags |= BLKCIPHER_WALK_DIFF;
217 blkcipher_map_dst(walk);
218 }
219
220 return 0;
221}
222
223static int blkcipher_walk_next(struct blkcipher_desc *desc,
224 struct blkcipher_walk *walk)
225{
226 unsigned int bsize;
227 unsigned int n;
228 int err;
229
230 n = walk->total;
231 if (unlikely(n < walk->cipher_blocksize)) {
232 desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
233 return blkcipher_walk_done(desc, walk, -EINVAL);
234 }
235
236 bsize = min(walk->walk_blocksize, n);
237
238 walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
239 BLKCIPHER_WALK_DIFF);
240 if (!scatterwalk_aligned(&walk->in, walk->alignmask) ||
241 !scatterwalk_aligned(&walk->out, walk->alignmask)) {
242 walk->flags |= BLKCIPHER_WALK_COPY;
243 if (!walk->page) {
244 walk->page = (void *)__get_free_page(GFP_ATOMIC);
245 if (!walk->page)
246 n = 0;
247 }
248 }
249
250 n = scatterwalk_clamp(&walk->in, n);
251 n = scatterwalk_clamp(&walk->out, n);
252
253 if (unlikely(n < bsize)) {
254 err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask);
255 goto set_phys_lowmem;
256 }
257
258 walk->nbytes = n;
259 if (walk->flags & BLKCIPHER_WALK_COPY) {
260 err = blkcipher_next_copy(walk);
261 goto set_phys_lowmem;
262 }
263
264 return blkcipher_next_fast(desc, walk);
265
266set_phys_lowmem:
267 if (walk->flags & BLKCIPHER_WALK_PHYS) {
268 walk->src.phys.page = virt_to_page(walk->src.virt.addr);
269 walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
270 walk->src.phys.offset &= PAGE_SIZE - 1;
271 walk->dst.phys.offset &= PAGE_SIZE - 1;
272 }
273 return err;
274}
275
276static inline int blkcipher_copy_iv(struct blkcipher_walk *walk)
277{
278 unsigned bs = walk->walk_blocksize;
279 unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1);
280 unsigned int size = aligned_bs * 2 +
281 walk->ivsize + max(aligned_bs, walk->ivsize) -
282 (walk->alignmask + 1);
283 u8 *iv;
284
285 size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1);
286 walk->buffer = kmalloc(size, GFP_ATOMIC);
287 if (!walk->buffer)
288 return -ENOMEM;
289
290 iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
291 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
292 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
293 iv = blkcipher_get_spot(iv, walk->ivsize);
294
295 walk->iv = memcpy(iv, walk->iv, walk->ivsize);
296 return 0;
297}
298
299int blkcipher_walk_virt(struct blkcipher_desc *desc,
300 struct blkcipher_walk *walk)
301{
302 walk->flags &= ~BLKCIPHER_WALK_PHYS;
303 walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
304 walk->cipher_blocksize = walk->walk_blocksize;
305 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
306 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
307 return blkcipher_walk_first(desc, walk);
308}
309EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
310
311int blkcipher_walk_phys(struct blkcipher_desc *desc,
312 struct blkcipher_walk *walk)
313{
314 walk->flags |= BLKCIPHER_WALK_PHYS;
315 walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
316 walk->cipher_blocksize = walk->walk_blocksize;
317 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
318 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
319 return blkcipher_walk_first(desc, walk);
320}
321EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
322
323static int blkcipher_walk_first(struct blkcipher_desc *desc,
324 struct blkcipher_walk *walk)
325{
326 if (WARN_ON_ONCE(in_irq()))
327 return -EDEADLK;
328
329 walk->iv = desc->info;
330 walk->nbytes = walk->total;
331 if (unlikely(!walk->total))
332 return 0;
333
334 walk->buffer = NULL;
335 if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
336 int err = blkcipher_copy_iv(walk);
337 if (err)
338 return err;
339 }
340
341 scatterwalk_start(&walk->in, walk->in.sg);
342 scatterwalk_start(&walk->out, walk->out.sg);
343 walk->page = NULL;
344
345 return blkcipher_walk_next(desc, walk);
346}
347
348int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
349 struct blkcipher_walk *walk,
350 unsigned int blocksize)
351{
352 walk->flags &= ~BLKCIPHER_WALK_PHYS;
353 walk->walk_blocksize = blocksize;
354 walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm);
355 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
356 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
357 return blkcipher_walk_first(desc, walk);
358}
359EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
360
361int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
362 struct blkcipher_walk *walk,
363 struct crypto_aead *tfm,
364 unsigned int blocksize)
365{
366 walk->flags &= ~BLKCIPHER_WALK_PHYS;
367 walk->walk_blocksize = blocksize;
368 walk->cipher_blocksize = crypto_aead_blocksize(tfm);
369 walk->ivsize = crypto_aead_ivsize(tfm);
370 walk->alignmask = crypto_aead_alignmask(tfm);
371 return blkcipher_walk_first(desc, walk);
372}
373EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block);
374
375static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
376 unsigned int keylen)
377{
378 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
379 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
380 int ret;
381 u8 *buffer, *alignbuffer;
382 unsigned long absize;
383
384 absize = keylen + alignmask;
385 buffer = kmalloc(absize, GFP_ATOMIC);
386 if (!buffer)
387 return -ENOMEM;
388
389 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
390 memcpy(alignbuffer, key, keylen);
391 ret = cipher->setkey(tfm, alignbuffer, keylen);
392 memset(alignbuffer, 0, keylen);
393 kfree(buffer);
394 return ret;
395}
396
397static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
398{
399 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
400 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
401
402 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
403 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
404 return -EINVAL;
405 }
406
407 if ((unsigned long)key & alignmask)
408 return setkey_unaligned(tfm, key, keylen);
409
410 return cipher->setkey(tfm, key, keylen);
411}
412
413static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
414 unsigned int keylen)
415{
416 return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
417}
418
419static int async_encrypt(struct ablkcipher_request *req)
420{
421 struct crypto_tfm *tfm = req->base.tfm;
422 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
423 struct blkcipher_desc desc = {
424 .tfm = __crypto_blkcipher_cast(tfm),
425 .info = req->info,
426 .flags = req->base.flags,
427 };
428
429
430 return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
431}
432
433static int async_decrypt(struct ablkcipher_request *req)
434{
435 struct crypto_tfm *tfm = req->base.tfm;
436 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
437 struct blkcipher_desc desc = {
438 .tfm = __crypto_blkcipher_cast(tfm),
439 .info = req->info,
440 .flags = req->base.flags,
441 };
442
443 return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
444}
445
446static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
447 u32 mask)
448{
449 struct blkcipher_alg *cipher = &alg->cra_blkcipher;
450 unsigned int len = alg->cra_ctxsize;
451
452 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
453 cipher->ivsize) {
454 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
455 len += cipher->ivsize;
456 }
457
458 return len;
459}
460
461static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
462{
463 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
464 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
465
466 crt->setkey = async_setkey;
467 crt->encrypt = async_encrypt;
468 crt->decrypt = async_decrypt;
469 crt->base = __crypto_ablkcipher_cast(tfm);
470 crt->ivsize = alg->ivsize;
471
472 return 0;
473}
474
475static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
476{
477 struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
478 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
479 unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
480 unsigned long addr;
481
482 crt->setkey = setkey;
483 crt->encrypt = alg->encrypt;
484 crt->decrypt = alg->decrypt;
485
486 addr = (unsigned long)crypto_tfm_ctx(tfm);
487 addr = ALIGN(addr, align);
488 addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
489 crt->iv = (void *)addr;
490
491 return 0;
492}
493
494static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
495{
496 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
497
498 if (alg->ivsize > PAGE_SIZE / 8)
499 return -EINVAL;
500
501 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
502 return crypto_init_blkcipher_ops_sync(tfm);
503 else
504 return crypto_init_blkcipher_ops_async(tfm);
505}
506
507#ifdef CONFIG_NET
508static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
509{
510 struct crypto_report_blkcipher rblkcipher;
511
512 strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
513 strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
514 sizeof(rblkcipher.geniv));
515
516 rblkcipher.blocksize = alg->cra_blocksize;
517 rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
518 rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
519 rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
520
521 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
522 sizeof(struct crypto_report_blkcipher), &rblkcipher))
523 goto nla_put_failure;
524 return 0;
525
526nla_put_failure:
527 return -EMSGSIZE;
528}
529#else
530static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
531{
532 return -ENOSYS;
533}
534#endif
535
536static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
537 __maybe_unused;
538static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
539{
540 seq_printf(m, "type : blkcipher\n");
541 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
542 seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
543 seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
544 seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
545 seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
546 "<default>");
547}
548
549const struct crypto_type crypto_blkcipher_type = {
550 .ctxsize = crypto_blkcipher_ctxsize,
551 .init = crypto_init_blkcipher_ops,
552#ifdef CONFIG_PROC_FS
553 .show = crypto_blkcipher_show,
554#endif
555 .report = crypto_blkcipher_report,
556};
557EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
558
559MODULE_LICENSE("GPL");
560MODULE_DESCRIPTION("Generic block chaining cipher type");
1/*
2 * Block chaining 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) 2006 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
17#include <crypto/internal/skcipher.h>
18#include <crypto/scatterwalk.h>
19#include <linux/errno.h>
20#include <linux/hardirq.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/scatterlist.h>
24#include <linux/seq_file.h>
25#include <linux/slab.h>
26#include <linux/string.h>
27#include <linux/cryptouser.h>
28#include <net/netlink.h>
29
30#include "internal.h"
31
32enum {
33 BLKCIPHER_WALK_PHYS = 1 << 0,
34 BLKCIPHER_WALK_SLOW = 1 << 1,
35 BLKCIPHER_WALK_COPY = 1 << 2,
36 BLKCIPHER_WALK_DIFF = 1 << 3,
37};
38
39static int blkcipher_walk_next(struct blkcipher_desc *desc,
40 struct blkcipher_walk *walk);
41static int blkcipher_walk_first(struct blkcipher_desc *desc,
42 struct blkcipher_walk *walk);
43
44static inline void blkcipher_map_src(struct blkcipher_walk *walk)
45{
46 walk->src.virt.addr = scatterwalk_map(&walk->in);
47}
48
49static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
50{
51 walk->dst.virt.addr = scatterwalk_map(&walk->out);
52}
53
54static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
55{
56 scatterwalk_unmap(walk->src.virt.addr);
57}
58
59static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
60{
61 scatterwalk_unmap(walk->dst.virt.addr);
62}
63
64/* Get a spot of the specified length that does not straddle a page.
65 * The caller needs to ensure that there is enough space for this operation.
66 */
67static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len)
68{
69 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
70 return max(start, end_page);
71}
72
73static inline unsigned int blkcipher_done_slow(struct crypto_blkcipher *tfm,
74 struct blkcipher_walk *walk,
75 unsigned int bsize)
76{
77 u8 *addr;
78 unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
79
80 addr = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
81 addr = blkcipher_get_spot(addr, bsize);
82 scatterwalk_copychunks(addr, &walk->out, bsize, 1);
83 return bsize;
84}
85
86static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
87 unsigned int n)
88{
89 if (walk->flags & BLKCIPHER_WALK_COPY) {
90 blkcipher_map_dst(walk);
91 memcpy(walk->dst.virt.addr, walk->page, n);
92 blkcipher_unmap_dst(walk);
93 } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
94 if (walk->flags & BLKCIPHER_WALK_DIFF)
95 blkcipher_unmap_dst(walk);
96 blkcipher_unmap_src(walk);
97 }
98
99 scatterwalk_advance(&walk->in, n);
100 scatterwalk_advance(&walk->out, n);
101
102 return n;
103}
104
105int blkcipher_walk_done(struct blkcipher_desc *desc,
106 struct blkcipher_walk *walk, int err)
107{
108 struct crypto_blkcipher *tfm = desc->tfm;
109 unsigned int nbytes = 0;
110
111 if (likely(err >= 0)) {
112 unsigned int n = walk->nbytes - err;
113
114 if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
115 n = blkcipher_done_fast(walk, n);
116 else if (WARN_ON(err)) {
117 err = -EINVAL;
118 goto err;
119 } else
120 n = blkcipher_done_slow(tfm, walk, n);
121
122 nbytes = walk->total - n;
123 err = 0;
124 }
125
126 scatterwalk_done(&walk->in, 0, nbytes);
127 scatterwalk_done(&walk->out, 1, nbytes);
128
129err:
130 walk->total = nbytes;
131 walk->nbytes = nbytes;
132
133 if (nbytes) {
134 crypto_yield(desc->flags);
135 return blkcipher_walk_next(desc, walk);
136 }
137
138 if (walk->iv != desc->info)
139 memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm));
140 if (walk->buffer != walk->page)
141 kfree(walk->buffer);
142 if (walk->page)
143 free_page((unsigned long)walk->page);
144
145 return err;
146}
147EXPORT_SYMBOL_GPL(blkcipher_walk_done);
148
149static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
150 struct blkcipher_walk *walk,
151 unsigned int bsize,
152 unsigned int alignmask)
153{
154 unsigned int n;
155 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
156
157 if (walk->buffer)
158 goto ok;
159
160 walk->buffer = walk->page;
161 if (walk->buffer)
162 goto ok;
163
164 n = aligned_bsize * 3 - (alignmask + 1) +
165 (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
166 walk->buffer = kmalloc(n, GFP_ATOMIC);
167 if (!walk->buffer)
168 return blkcipher_walk_done(desc, walk, -ENOMEM);
169
170ok:
171 walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
172 alignmask + 1);
173 walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
174 walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
175 aligned_bsize, bsize);
176
177 scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
178
179 walk->nbytes = bsize;
180 walk->flags |= BLKCIPHER_WALK_SLOW;
181
182 return 0;
183}
184
185static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
186{
187 u8 *tmp = walk->page;
188
189 blkcipher_map_src(walk);
190 memcpy(tmp, walk->src.virt.addr, walk->nbytes);
191 blkcipher_unmap_src(walk);
192
193 walk->src.virt.addr = tmp;
194 walk->dst.virt.addr = tmp;
195
196 return 0;
197}
198
199static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
200 struct blkcipher_walk *walk)
201{
202 unsigned long diff;
203
204 walk->src.phys.page = scatterwalk_page(&walk->in);
205 walk->src.phys.offset = offset_in_page(walk->in.offset);
206 walk->dst.phys.page = scatterwalk_page(&walk->out);
207 walk->dst.phys.offset = offset_in_page(walk->out.offset);
208
209 if (walk->flags & BLKCIPHER_WALK_PHYS)
210 return 0;
211
212 diff = walk->src.phys.offset - walk->dst.phys.offset;
213 diff |= walk->src.virt.page - walk->dst.virt.page;
214
215 blkcipher_map_src(walk);
216 walk->dst.virt.addr = walk->src.virt.addr;
217
218 if (diff) {
219 walk->flags |= BLKCIPHER_WALK_DIFF;
220 blkcipher_map_dst(walk);
221 }
222
223 return 0;
224}
225
226static int blkcipher_walk_next(struct blkcipher_desc *desc,
227 struct blkcipher_walk *walk)
228{
229 struct crypto_blkcipher *tfm = desc->tfm;
230 unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
231 unsigned int bsize;
232 unsigned int n;
233 int err;
234
235 n = walk->total;
236 if (unlikely(n < crypto_blkcipher_blocksize(tfm))) {
237 desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
238 return blkcipher_walk_done(desc, walk, -EINVAL);
239 }
240
241 walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
242 BLKCIPHER_WALK_DIFF);
243 if (!scatterwalk_aligned(&walk->in, alignmask) ||
244 !scatterwalk_aligned(&walk->out, alignmask)) {
245 walk->flags |= BLKCIPHER_WALK_COPY;
246 if (!walk->page) {
247 walk->page = (void *)__get_free_page(GFP_ATOMIC);
248 if (!walk->page)
249 n = 0;
250 }
251 }
252
253 bsize = min(walk->blocksize, n);
254 n = scatterwalk_clamp(&walk->in, n);
255 n = scatterwalk_clamp(&walk->out, n);
256
257 if (unlikely(n < bsize)) {
258 err = blkcipher_next_slow(desc, walk, bsize, alignmask);
259 goto set_phys_lowmem;
260 }
261
262 walk->nbytes = n;
263 if (walk->flags & BLKCIPHER_WALK_COPY) {
264 err = blkcipher_next_copy(walk);
265 goto set_phys_lowmem;
266 }
267
268 return blkcipher_next_fast(desc, walk);
269
270set_phys_lowmem:
271 if (walk->flags & BLKCIPHER_WALK_PHYS) {
272 walk->src.phys.page = virt_to_page(walk->src.virt.addr);
273 walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
274 walk->src.phys.offset &= PAGE_SIZE - 1;
275 walk->dst.phys.offset &= PAGE_SIZE - 1;
276 }
277 return err;
278}
279
280static inline int blkcipher_copy_iv(struct blkcipher_walk *walk,
281 struct crypto_blkcipher *tfm,
282 unsigned int alignmask)
283{
284 unsigned bs = walk->blocksize;
285 unsigned int ivsize = crypto_blkcipher_ivsize(tfm);
286 unsigned aligned_bs = ALIGN(bs, alignmask + 1);
287 unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
288 (alignmask + 1);
289 u8 *iv;
290
291 size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
292 walk->buffer = kmalloc(size, GFP_ATOMIC);
293 if (!walk->buffer)
294 return -ENOMEM;
295
296 iv = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
297 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
298 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
299 iv = blkcipher_get_spot(iv, ivsize);
300
301 walk->iv = memcpy(iv, walk->iv, ivsize);
302 return 0;
303}
304
305int blkcipher_walk_virt(struct blkcipher_desc *desc,
306 struct blkcipher_walk *walk)
307{
308 walk->flags &= ~BLKCIPHER_WALK_PHYS;
309 walk->blocksize = crypto_blkcipher_blocksize(desc->tfm);
310 return blkcipher_walk_first(desc, walk);
311}
312EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
313
314int blkcipher_walk_phys(struct blkcipher_desc *desc,
315 struct blkcipher_walk *walk)
316{
317 walk->flags |= BLKCIPHER_WALK_PHYS;
318 walk->blocksize = crypto_blkcipher_blocksize(desc->tfm);
319 return blkcipher_walk_first(desc, walk);
320}
321EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
322
323static int blkcipher_walk_first(struct blkcipher_desc *desc,
324 struct blkcipher_walk *walk)
325{
326 struct crypto_blkcipher *tfm = desc->tfm;
327 unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
328
329 if (WARN_ON_ONCE(in_irq()))
330 return -EDEADLK;
331
332 walk->nbytes = walk->total;
333 if (unlikely(!walk->total))
334 return 0;
335
336 walk->buffer = NULL;
337 walk->iv = desc->info;
338 if (unlikely(((unsigned long)walk->iv & alignmask))) {
339 int err = blkcipher_copy_iv(walk, tfm, alignmask);
340 if (err)
341 return err;
342 }
343
344 scatterwalk_start(&walk->in, walk->in.sg);
345 scatterwalk_start(&walk->out, walk->out.sg);
346 walk->page = NULL;
347
348 return blkcipher_walk_next(desc, walk);
349}
350
351int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
352 struct blkcipher_walk *walk,
353 unsigned int blocksize)
354{
355 walk->flags &= ~BLKCIPHER_WALK_PHYS;
356 walk->blocksize = blocksize;
357 return blkcipher_walk_first(desc, walk);
358}
359EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
360
361static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
362 unsigned int keylen)
363{
364 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
365 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
366 int ret;
367 u8 *buffer, *alignbuffer;
368 unsigned long absize;
369
370 absize = keylen + alignmask;
371 buffer = kmalloc(absize, GFP_ATOMIC);
372 if (!buffer)
373 return -ENOMEM;
374
375 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
376 memcpy(alignbuffer, key, keylen);
377 ret = cipher->setkey(tfm, alignbuffer, keylen);
378 memset(alignbuffer, 0, keylen);
379 kfree(buffer);
380 return ret;
381}
382
383static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
384{
385 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
386 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
387
388 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
389 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
390 return -EINVAL;
391 }
392
393 if ((unsigned long)key & alignmask)
394 return setkey_unaligned(tfm, key, keylen);
395
396 return cipher->setkey(tfm, key, keylen);
397}
398
399static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
400 unsigned int keylen)
401{
402 return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
403}
404
405static int async_encrypt(struct ablkcipher_request *req)
406{
407 struct crypto_tfm *tfm = req->base.tfm;
408 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
409 struct blkcipher_desc desc = {
410 .tfm = __crypto_blkcipher_cast(tfm),
411 .info = req->info,
412 .flags = req->base.flags,
413 };
414
415
416 return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
417}
418
419static int async_decrypt(struct ablkcipher_request *req)
420{
421 struct crypto_tfm *tfm = req->base.tfm;
422 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
423 struct blkcipher_desc desc = {
424 .tfm = __crypto_blkcipher_cast(tfm),
425 .info = req->info,
426 .flags = req->base.flags,
427 };
428
429 return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
430}
431
432static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
433 u32 mask)
434{
435 struct blkcipher_alg *cipher = &alg->cra_blkcipher;
436 unsigned int len = alg->cra_ctxsize;
437
438 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
439 cipher->ivsize) {
440 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
441 len += cipher->ivsize;
442 }
443
444 return len;
445}
446
447static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
448{
449 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
450 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
451
452 crt->setkey = async_setkey;
453 crt->encrypt = async_encrypt;
454 crt->decrypt = async_decrypt;
455 if (!alg->ivsize) {
456 crt->givencrypt = skcipher_null_givencrypt;
457 crt->givdecrypt = skcipher_null_givdecrypt;
458 }
459 crt->base = __crypto_ablkcipher_cast(tfm);
460 crt->ivsize = alg->ivsize;
461
462 return 0;
463}
464
465static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
466{
467 struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
468 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
469 unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
470 unsigned long addr;
471
472 crt->setkey = setkey;
473 crt->encrypt = alg->encrypt;
474 crt->decrypt = alg->decrypt;
475
476 addr = (unsigned long)crypto_tfm_ctx(tfm);
477 addr = ALIGN(addr, align);
478 addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
479 crt->iv = (void *)addr;
480
481 return 0;
482}
483
484static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
485{
486 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
487
488 if (alg->ivsize > PAGE_SIZE / 8)
489 return -EINVAL;
490
491 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
492 return crypto_init_blkcipher_ops_sync(tfm);
493 else
494 return crypto_init_blkcipher_ops_async(tfm);
495}
496
497#ifdef CONFIG_NET
498static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
499{
500 struct crypto_report_blkcipher rblkcipher;
501
502 snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "blkcipher");
503 snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s",
504 alg->cra_blkcipher.geniv ?: "<default>");
505
506 rblkcipher.blocksize = alg->cra_blocksize;
507 rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
508 rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
509 rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
510
511 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
512 sizeof(struct crypto_report_blkcipher), &rblkcipher))
513 goto nla_put_failure;
514 return 0;
515
516nla_put_failure:
517 return -EMSGSIZE;
518}
519#else
520static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
521{
522 return -ENOSYS;
523}
524#endif
525
526static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
527 __attribute__ ((unused));
528static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
529{
530 seq_printf(m, "type : blkcipher\n");
531 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
532 seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
533 seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
534 seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
535 seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
536 "<default>");
537}
538
539const struct crypto_type crypto_blkcipher_type = {
540 .ctxsize = crypto_blkcipher_ctxsize,
541 .init = crypto_init_blkcipher_ops,
542#ifdef CONFIG_PROC_FS
543 .show = crypto_blkcipher_show,
544#endif
545 .report = crypto_blkcipher_report,
546};
547EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
548
549static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn,
550 const char *name, u32 type, u32 mask)
551{
552 struct crypto_alg *alg;
553 int err;
554
555 type = crypto_skcipher_type(type);
556 mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV;
557
558 alg = crypto_alg_mod_lookup(name, type, mask);
559 if (IS_ERR(alg))
560 return PTR_ERR(alg);
561
562 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
563 crypto_mod_put(alg);
564 return err;
565}
566
567struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
568 struct rtattr **tb, u32 type,
569 u32 mask)
570{
571 struct {
572 int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
573 unsigned int keylen);
574 int (*encrypt)(struct ablkcipher_request *req);
575 int (*decrypt)(struct ablkcipher_request *req);
576
577 unsigned int min_keysize;
578 unsigned int max_keysize;
579 unsigned int ivsize;
580
581 const char *geniv;
582 } balg;
583 const char *name;
584 struct crypto_skcipher_spawn *spawn;
585 struct crypto_attr_type *algt;
586 struct crypto_instance *inst;
587 struct crypto_alg *alg;
588 int err;
589
590 algt = crypto_get_attr_type(tb);
591 err = PTR_ERR(algt);
592 if (IS_ERR(algt))
593 return ERR_PTR(err);
594
595 if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) &
596 algt->mask)
597 return ERR_PTR(-EINVAL);
598
599 name = crypto_attr_alg_name(tb[1]);
600 err = PTR_ERR(name);
601 if (IS_ERR(name))
602 return ERR_PTR(err);
603
604 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
605 if (!inst)
606 return ERR_PTR(-ENOMEM);
607
608 spawn = crypto_instance_ctx(inst);
609
610 /* Ignore async algorithms if necessary. */
611 mask |= crypto_requires_sync(algt->type, algt->mask);
612
613 crypto_set_skcipher_spawn(spawn, inst);
614 err = crypto_grab_nivcipher(spawn, name, type, mask);
615 if (err)
616 goto err_free_inst;
617
618 alg = crypto_skcipher_spawn_alg(spawn);
619
620 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
621 CRYPTO_ALG_TYPE_BLKCIPHER) {
622 balg.ivsize = alg->cra_blkcipher.ivsize;
623 balg.min_keysize = alg->cra_blkcipher.min_keysize;
624 balg.max_keysize = alg->cra_blkcipher.max_keysize;
625
626 balg.setkey = async_setkey;
627 balg.encrypt = async_encrypt;
628 balg.decrypt = async_decrypt;
629
630 balg.geniv = alg->cra_blkcipher.geniv;
631 } else {
632 balg.ivsize = alg->cra_ablkcipher.ivsize;
633 balg.min_keysize = alg->cra_ablkcipher.min_keysize;
634 balg.max_keysize = alg->cra_ablkcipher.max_keysize;
635
636 balg.setkey = alg->cra_ablkcipher.setkey;
637 balg.encrypt = alg->cra_ablkcipher.encrypt;
638 balg.decrypt = alg->cra_ablkcipher.decrypt;
639
640 balg.geniv = alg->cra_ablkcipher.geniv;
641 }
642
643 err = -EINVAL;
644 if (!balg.ivsize)
645 goto err_drop_alg;
646
647 /*
648 * This is only true if we're constructing an algorithm with its
649 * default IV generator. For the default generator we elide the
650 * template name and double-check the IV generator.
651 */
652 if (algt->mask & CRYPTO_ALG_GENIV) {
653 if (!balg.geniv)
654 balg.geniv = crypto_default_geniv(alg);
655 err = -EAGAIN;
656 if (strcmp(tmpl->name, balg.geniv))
657 goto err_drop_alg;
658
659 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
660 memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
661 CRYPTO_MAX_ALG_NAME);
662 } else {
663 err = -ENAMETOOLONG;
664 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
665 "%s(%s)", tmpl->name, alg->cra_name) >=
666 CRYPTO_MAX_ALG_NAME)
667 goto err_drop_alg;
668 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
669 "%s(%s)", tmpl->name, alg->cra_driver_name) >=
670 CRYPTO_MAX_ALG_NAME)
671 goto err_drop_alg;
672 }
673
674 inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV;
675 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
676 inst->alg.cra_priority = alg->cra_priority;
677 inst->alg.cra_blocksize = alg->cra_blocksize;
678 inst->alg.cra_alignmask = alg->cra_alignmask;
679 inst->alg.cra_type = &crypto_givcipher_type;
680
681 inst->alg.cra_ablkcipher.ivsize = balg.ivsize;
682 inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize;
683 inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize;
684 inst->alg.cra_ablkcipher.geniv = balg.geniv;
685
686 inst->alg.cra_ablkcipher.setkey = balg.setkey;
687 inst->alg.cra_ablkcipher.encrypt = balg.encrypt;
688 inst->alg.cra_ablkcipher.decrypt = balg.decrypt;
689
690out:
691 return inst;
692
693err_drop_alg:
694 crypto_drop_skcipher(spawn);
695err_free_inst:
696 kfree(inst);
697 inst = ERR_PTR(err);
698 goto out;
699}
700EXPORT_SYMBOL_GPL(skcipher_geniv_alloc);
701
702void skcipher_geniv_free(struct crypto_instance *inst)
703{
704 crypto_drop_skcipher(crypto_instance_ctx(inst));
705 kfree(inst);
706}
707EXPORT_SYMBOL_GPL(skcipher_geniv_free);
708
709int skcipher_geniv_init(struct crypto_tfm *tfm)
710{
711 struct crypto_instance *inst = (void *)tfm->__crt_alg;
712 struct crypto_ablkcipher *cipher;
713
714 cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst));
715 if (IS_ERR(cipher))
716 return PTR_ERR(cipher);
717
718 tfm->crt_ablkcipher.base = cipher;
719 tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher);
720
721 return 0;
722}
723EXPORT_SYMBOL_GPL(skcipher_geniv_init);
724
725void skcipher_geniv_exit(struct crypto_tfm *tfm)
726{
727 crypto_free_ablkcipher(tfm->crt_ablkcipher.base);
728}
729EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
730
731MODULE_LICENSE("GPL");
732MODULE_DESCRIPTION("Generic block chaining cipher type");