1 /*
2 * Asynchronous block chaining cipher operations.
3 *
4 * This is the asynchronous version of blkcipher.c indicating completion
5 * via a callback.
6 *
7 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15
16 #include <crypto/internal/skcipher.h>
17 #include <linux/cpumask.h>
18 #include <linux/err.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
25 #include <linux/seq_file.h>
26 #include <linux/cryptouser.h>
27 #include <net/netlink.h>
28
29 #include <crypto/scatterwalk.h>
30
31 #include "internal.h"
32
33 static const char *skcipher_default_geniv __read_mostly;
34
35 struct ablkcipher_buffer {
36 struct list_head entry;
37 struct scatter_walk dst;
38 unsigned int len;
39 void *data;
40 };
41
42 enum {
43 ABLKCIPHER_WALK_SLOW = 1 << 0,
44 };
45
ablkcipher_buffer_write(struct ablkcipher_buffer * p)46 static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
47 {
48 scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
49 }
50
__ablkcipher_walk_complete(struct ablkcipher_walk * walk)51 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
52 {
53 struct ablkcipher_buffer *p, *tmp;
54
55 list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
56 ablkcipher_buffer_write(p);
57 list_del(&p->entry);
58 kfree(p);
59 }
60 }
61 EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
62
ablkcipher_queue_write(struct ablkcipher_walk * walk,struct ablkcipher_buffer * p)63 static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
64 struct ablkcipher_buffer *p)
65 {
66 p->dst = walk->out;
67 list_add_tail(&p->entry, &walk->buffers);
68 }
69
70 /* Get a spot of the specified length that does not straddle a page.
71 * The caller needs to ensure that there is enough space for this operation.
72 */
ablkcipher_get_spot(u8 * start,unsigned int len)73 static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
74 {
75 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
76 return max(start, end_page);
77 }
78
ablkcipher_done_slow(struct ablkcipher_walk * walk,unsigned int bsize)79 static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
80 unsigned int bsize)
81 {
82 unsigned int n = bsize;
83
84 for (;;) {
85 unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
86
87 if (len_this_page > n)
88 len_this_page = n;
89 scatterwalk_advance(&walk->out, n);
90 if (n == len_this_page)
91 break;
92 n -= len_this_page;
93 scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg));
94 }
95
96 return bsize;
97 }
98
ablkcipher_done_fast(struct ablkcipher_walk * walk,unsigned int n)99 static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
100 unsigned int n)
101 {
102 scatterwalk_advance(&walk->in, n);
103 scatterwalk_advance(&walk->out, n);
104
105 return n;
106 }
107
108 static int ablkcipher_walk_next(struct ablkcipher_request *req,
109 struct ablkcipher_walk *walk);
110
ablkcipher_walk_done(struct ablkcipher_request * req,struct ablkcipher_walk * walk,int err)111 int ablkcipher_walk_done(struct ablkcipher_request *req,
112 struct ablkcipher_walk *walk, int err)
113 {
114 struct crypto_tfm *tfm = req->base.tfm;
115 unsigned int nbytes = 0;
116
117 if (likely(err >= 0)) {
118 unsigned int n = walk->nbytes - err;
119
120 if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
121 n = ablkcipher_done_fast(walk, n);
122 else if (WARN_ON(err)) {
123 err = -EINVAL;
124 goto err;
125 } else
126 n = ablkcipher_done_slow(walk, n);
127
128 nbytes = walk->total - n;
129 err = 0;
130 }
131
132 scatterwalk_done(&walk->in, 0, nbytes);
133 scatterwalk_done(&walk->out, 1, nbytes);
134
135 err:
136 walk->total = nbytes;
137 walk->nbytes = nbytes;
138
139 if (nbytes) {
140 crypto_yield(req->base.flags);
141 return ablkcipher_walk_next(req, walk);
142 }
143
144 if (walk->iv != req->info)
145 memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
146 kfree(walk->iv_buffer);
147
148 return err;
149 }
150 EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
151
ablkcipher_next_slow(struct ablkcipher_request * req,struct ablkcipher_walk * walk,unsigned int bsize,unsigned int alignmask,void ** src_p,void ** dst_p)152 static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
153 struct ablkcipher_walk *walk,
154 unsigned int bsize,
155 unsigned int alignmask,
156 void **src_p, void **dst_p)
157 {
158 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
159 struct ablkcipher_buffer *p;
160 void *src, *dst, *base;
161 unsigned int n;
162
163 n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
164 n += (aligned_bsize * 3 - (alignmask + 1) +
165 (alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
166
167 p = kmalloc(n, GFP_ATOMIC);
168 if (!p)
169 return ablkcipher_walk_done(req, walk, -ENOMEM);
170
171 base = p + 1;
172
173 dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
174 src = dst = ablkcipher_get_spot(dst, bsize);
175
176 p->len = bsize;
177 p->data = dst;
178
179 scatterwalk_copychunks(src, &walk->in, bsize, 0);
180
181 ablkcipher_queue_write(walk, p);
182
183 walk->nbytes = bsize;
184 walk->flags |= ABLKCIPHER_WALK_SLOW;
185
186 *src_p = src;
187 *dst_p = dst;
188
189 return 0;
190 }
191
ablkcipher_copy_iv(struct ablkcipher_walk * walk,struct crypto_tfm * tfm,unsigned int alignmask)192 static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
193 struct crypto_tfm *tfm,
194 unsigned int alignmask)
195 {
196 unsigned bs = walk->blocksize;
197 unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
198 unsigned aligned_bs = ALIGN(bs, alignmask + 1);
199 unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
200 (alignmask + 1);
201 u8 *iv;
202
203 size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
204 walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
205 if (!walk->iv_buffer)
206 return -ENOMEM;
207
208 iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
209 iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
210 iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
211 iv = ablkcipher_get_spot(iv, ivsize);
212
213 walk->iv = memcpy(iv, walk->iv, ivsize);
214 return 0;
215 }
216
ablkcipher_next_fast(struct ablkcipher_request * req,struct ablkcipher_walk * walk)217 static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
218 struct ablkcipher_walk *walk)
219 {
220 walk->src.page = scatterwalk_page(&walk->in);
221 walk->src.offset = offset_in_page(walk->in.offset);
222 walk->dst.page = scatterwalk_page(&walk->out);
223 walk->dst.offset = offset_in_page(walk->out.offset);
224
225 return 0;
226 }
227
ablkcipher_walk_next(struct ablkcipher_request * req,struct ablkcipher_walk * walk)228 static int ablkcipher_walk_next(struct ablkcipher_request *req,
229 struct ablkcipher_walk *walk)
230 {
231 struct crypto_tfm *tfm = req->base.tfm;
232 unsigned int alignmask, bsize, n;
233 void *src, *dst;
234 int err;
235
236 alignmask = crypto_tfm_alg_alignmask(tfm);
237 n = walk->total;
238 if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
239 req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
240 return ablkcipher_walk_done(req, walk, -EINVAL);
241 }
242
243 walk->flags &= ~ABLKCIPHER_WALK_SLOW;
244 src = dst = NULL;
245
246 bsize = min(walk->blocksize, n);
247 n = scatterwalk_clamp(&walk->in, n);
248 n = scatterwalk_clamp(&walk->out, n);
249
250 if (n < bsize ||
251 !scatterwalk_aligned(&walk->in, alignmask) ||
252 !scatterwalk_aligned(&walk->out, alignmask)) {
253 err = ablkcipher_next_slow(req, walk, bsize, alignmask,
254 &src, &dst);
255 goto set_phys_lowmem;
256 }
257
258 walk->nbytes = n;
259
260 return ablkcipher_next_fast(req, walk);
261
262 set_phys_lowmem:
263 if (err >= 0) {
264 walk->src.page = virt_to_page(src);
265 walk->dst.page = virt_to_page(dst);
266 walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
267 walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
268 }
269
270 return err;
271 }
272
ablkcipher_walk_first(struct ablkcipher_request * req,struct ablkcipher_walk * walk)273 static int ablkcipher_walk_first(struct ablkcipher_request *req,
274 struct ablkcipher_walk *walk)
275 {
276 struct crypto_tfm *tfm = req->base.tfm;
277 unsigned int alignmask;
278
279 alignmask = crypto_tfm_alg_alignmask(tfm);
280 if (WARN_ON_ONCE(in_irq()))
281 return -EDEADLK;
282
283 walk->nbytes = walk->total;
284 if (unlikely(!walk->total))
285 return 0;
286
287 walk->iv_buffer = NULL;
288 walk->iv = req->info;
289 if (unlikely(((unsigned long)walk->iv & alignmask))) {
290 int err = ablkcipher_copy_iv(walk, tfm, alignmask);
291 if (err)
292 return err;
293 }
294
295 scatterwalk_start(&walk->in, walk->in.sg);
296 scatterwalk_start(&walk->out, walk->out.sg);
297
298 return ablkcipher_walk_next(req, walk);
299 }
300
ablkcipher_walk_phys(struct ablkcipher_request * req,struct ablkcipher_walk * walk)301 int ablkcipher_walk_phys(struct ablkcipher_request *req,
302 struct ablkcipher_walk *walk)
303 {
304 walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
305 return ablkcipher_walk_first(req, walk);
306 }
307 EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
308
setkey_unaligned(struct crypto_ablkcipher * tfm,const u8 * key,unsigned int keylen)309 static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
310 unsigned int keylen)
311 {
312 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
313 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
314 int ret;
315 u8 *buffer, *alignbuffer;
316 unsigned long absize;
317
318 absize = keylen + alignmask;
319 buffer = kmalloc(absize, GFP_ATOMIC);
320 if (!buffer)
321 return -ENOMEM;
322
323 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
324 memcpy(alignbuffer, key, keylen);
325 ret = cipher->setkey(tfm, alignbuffer, keylen);
326 memset(alignbuffer, 0, keylen);
327 kfree(buffer);
328 return ret;
329 }
330
setkey(struct crypto_ablkcipher * tfm,const u8 * key,unsigned int keylen)331 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
332 unsigned int keylen)
333 {
334 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
335 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
336
337 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
338 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
339 return -EINVAL;
340 }
341
342 if ((unsigned long)key & alignmask)
343 return setkey_unaligned(tfm, key, keylen);
344
345 return cipher->setkey(tfm, key, keylen);
346 }
347
crypto_ablkcipher_ctxsize(struct crypto_alg * alg,u32 type,u32 mask)348 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
349 u32 mask)
350 {
351 return alg->cra_ctxsize;
352 }
353
skcipher_null_givencrypt(struct skcipher_givcrypt_request * req)354 int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
355 {
356 return crypto_ablkcipher_encrypt(&req->creq);
357 }
358
skcipher_null_givdecrypt(struct skcipher_givcrypt_request * req)359 int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
360 {
361 return crypto_ablkcipher_decrypt(&req->creq);
362 }
363
crypto_init_ablkcipher_ops(struct crypto_tfm * tfm,u32 type,u32 mask)364 static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
365 u32 mask)
366 {
367 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
368 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
369
370 if (alg->ivsize > PAGE_SIZE / 8)
371 return -EINVAL;
372
373 crt->setkey = setkey;
374 crt->encrypt = alg->encrypt;
375 crt->decrypt = alg->decrypt;
376 if (!alg->ivsize) {
377 crt->givencrypt = skcipher_null_givencrypt;
378 crt->givdecrypt = skcipher_null_givdecrypt;
379 }
380 crt->base = __crypto_ablkcipher_cast(tfm);
381 crt->ivsize = alg->ivsize;
382
383 return 0;
384 }
385
386 #ifdef CONFIG_NET
crypto_ablkcipher_report(struct sk_buff * skb,struct crypto_alg * alg)387 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
388 {
389 struct crypto_report_blkcipher rblkcipher;
390
391 strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
392 strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
393 sizeof(rblkcipher.geniv));
394
395 rblkcipher.blocksize = alg->cra_blocksize;
396 rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
397 rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
398 rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
399
400 NLA_PUT(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
401 sizeof(struct crypto_report_blkcipher), &rblkcipher);
402
403 return 0;
404
405 nla_put_failure:
406 return -EMSGSIZE;
407 }
408 #else
crypto_ablkcipher_report(struct sk_buff * skb,struct crypto_alg * alg)409 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
410 {
411 return -ENOSYS;
412 }
413 #endif
414
415 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
416 __attribute__ ((unused));
crypto_ablkcipher_show(struct seq_file * m,struct crypto_alg * alg)417 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
418 {
419 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
420
421 seq_printf(m, "type : ablkcipher\n");
422 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
423 "yes" : "no");
424 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
425 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
426 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
427 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
428 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
429 }
430
431 const struct crypto_type crypto_ablkcipher_type = {
432 .ctxsize = crypto_ablkcipher_ctxsize,
433 .init = crypto_init_ablkcipher_ops,
434 #ifdef CONFIG_PROC_FS
435 .show = crypto_ablkcipher_show,
436 #endif
437 .report = crypto_ablkcipher_report,
438 };
439 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
440
no_givdecrypt(struct skcipher_givcrypt_request * req)441 static int no_givdecrypt(struct skcipher_givcrypt_request *req)
442 {
443 return -ENOSYS;
444 }
445
crypto_init_givcipher_ops(struct crypto_tfm * tfm,u32 type,u32 mask)446 static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
447 u32 mask)
448 {
449 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
450 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
451
452 if (alg->ivsize > PAGE_SIZE / 8)
453 return -EINVAL;
454
455 crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
456 alg->setkey : setkey;
457 crt->encrypt = alg->encrypt;
458 crt->decrypt = alg->decrypt;
459 crt->givencrypt = alg->givencrypt;
460 crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
461 crt->base = __crypto_ablkcipher_cast(tfm);
462 crt->ivsize = alg->ivsize;
463
464 return 0;
465 }
466
467 #ifdef CONFIG_NET
crypto_givcipher_report(struct sk_buff * skb,struct crypto_alg * alg)468 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
469 {
470 struct crypto_report_blkcipher rblkcipher;
471
472 strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
473 strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
474 sizeof(rblkcipher.geniv));
475
476 rblkcipher.blocksize = alg->cra_blocksize;
477 rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
478 rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
479 rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
480
481 NLA_PUT(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
482 sizeof(struct crypto_report_blkcipher), &rblkcipher);
483
484 return 0;
485
486 nla_put_failure:
487 return -EMSGSIZE;
488 }
489 #else
crypto_givcipher_report(struct sk_buff * skb,struct crypto_alg * alg)490 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
491 {
492 return -ENOSYS;
493 }
494 #endif
495
496 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
497 __attribute__ ((unused));
crypto_givcipher_show(struct seq_file * m,struct crypto_alg * alg)498 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
499 {
500 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
501
502 seq_printf(m, "type : givcipher\n");
503 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
504 "yes" : "no");
505 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
506 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
507 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
508 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
509 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
510 }
511
512 const struct crypto_type crypto_givcipher_type = {
513 .ctxsize = crypto_ablkcipher_ctxsize,
514 .init = crypto_init_givcipher_ops,
515 #ifdef CONFIG_PROC_FS
516 .show = crypto_givcipher_show,
517 #endif
518 .report = crypto_givcipher_report,
519 };
520 EXPORT_SYMBOL_GPL(crypto_givcipher_type);
521
crypto_default_geniv(const struct crypto_alg * alg)522 const char *crypto_default_geniv(const struct crypto_alg *alg)
523 {
524 if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
525 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
526 alg->cra_ablkcipher.ivsize) !=
527 alg->cra_blocksize)
528 return "chainiv";
529
530 return alg->cra_flags & CRYPTO_ALG_ASYNC ?
531 "eseqiv" : skcipher_default_geniv;
532 }
533
crypto_givcipher_default(struct crypto_alg * alg,u32 type,u32 mask)534 static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
535 {
536 struct rtattr *tb[3];
537 struct {
538 struct rtattr attr;
539 struct crypto_attr_type data;
540 } ptype;
541 struct {
542 struct rtattr attr;
543 struct crypto_attr_alg data;
544 } palg;
545 struct crypto_template *tmpl;
546 struct crypto_instance *inst;
547 struct crypto_alg *larval;
548 const char *geniv;
549 int err;
550
551 larval = crypto_larval_lookup(alg->cra_driver_name,
552 (type & ~CRYPTO_ALG_TYPE_MASK) |
553 CRYPTO_ALG_TYPE_GIVCIPHER,
554 mask | CRYPTO_ALG_TYPE_MASK);
555 err = PTR_ERR(larval);
556 if (IS_ERR(larval))
557 goto out;
558
559 err = -EAGAIN;
560 if (!crypto_is_larval(larval))
561 goto drop_larval;
562
563 ptype.attr.rta_len = sizeof(ptype);
564 ptype.attr.rta_type = CRYPTOA_TYPE;
565 ptype.data.type = type | CRYPTO_ALG_GENIV;
566 /* GENIV tells the template that we're making a default geniv. */
567 ptype.data.mask = mask | CRYPTO_ALG_GENIV;
568 tb[0] = &ptype.attr;
569
570 palg.attr.rta_len = sizeof(palg);
571 palg.attr.rta_type = CRYPTOA_ALG;
572 /* Must use the exact name to locate ourselves. */
573 memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
574 tb[1] = &palg.attr;
575
576 tb[2] = NULL;
577
578 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
579 CRYPTO_ALG_TYPE_BLKCIPHER)
580 geniv = alg->cra_blkcipher.geniv;
581 else
582 geniv = alg->cra_ablkcipher.geniv;
583
584 if (!geniv)
585 geniv = crypto_default_geniv(alg);
586
587 tmpl = crypto_lookup_template(geniv);
588 err = -ENOENT;
589 if (!tmpl)
590 goto kill_larval;
591
592 inst = tmpl->alloc(tb);
593 err = PTR_ERR(inst);
594 if (IS_ERR(inst))
595 goto put_tmpl;
596
597 if ((err = crypto_register_instance(tmpl, inst))) {
598 tmpl->free(inst);
599 goto put_tmpl;
600 }
601
602 /* Redo the lookup to use the instance we just registered. */
603 err = -EAGAIN;
604
605 put_tmpl:
606 crypto_tmpl_put(tmpl);
607 kill_larval:
608 crypto_larval_kill(larval);
609 drop_larval:
610 crypto_mod_put(larval);
611 out:
612 crypto_mod_put(alg);
613 return err;
614 }
615
crypto_lookup_skcipher(const char * name,u32 type,u32 mask)616 struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask)
617 {
618 struct crypto_alg *alg;
619
620 alg = crypto_alg_mod_lookup(name, type, mask);
621 if (IS_ERR(alg))
622 return alg;
623
624 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
625 CRYPTO_ALG_TYPE_GIVCIPHER)
626 return alg;
627
628 if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
629 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
630 alg->cra_ablkcipher.ivsize))
631 return alg;
632
633 crypto_mod_put(alg);
634 alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
635 mask & ~CRYPTO_ALG_TESTED);
636 if (IS_ERR(alg))
637 return alg;
638
639 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
640 CRYPTO_ALG_TYPE_GIVCIPHER) {
641 if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
642 crypto_mod_put(alg);
643 alg = ERR_PTR(-ENOENT);
644 }
645 return alg;
646 }
647
648 BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
649 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
650 alg->cra_ablkcipher.ivsize));
651
652 return ERR_PTR(crypto_givcipher_default(alg, type, mask));
653 }
654 EXPORT_SYMBOL_GPL(crypto_lookup_skcipher);
655
crypto_grab_skcipher(struct crypto_skcipher_spawn * spawn,const char * name,u32 type,u32 mask)656 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
657 u32 type, u32 mask)
658 {
659 struct crypto_alg *alg;
660 int err;
661
662 type = crypto_skcipher_type(type);
663 mask = crypto_skcipher_mask(mask);
664
665 alg = crypto_lookup_skcipher(name, type, mask);
666 if (IS_ERR(alg))
667 return PTR_ERR(alg);
668
669 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
670 crypto_mod_put(alg);
671 return err;
672 }
673 EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
674
crypto_alloc_ablkcipher(const char * alg_name,u32 type,u32 mask)675 struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
676 u32 type, u32 mask)
677 {
678 struct crypto_tfm *tfm;
679 int err;
680
681 type = crypto_skcipher_type(type);
682 mask = crypto_skcipher_mask(mask);
683
684 for (;;) {
685 struct crypto_alg *alg;
686
687 alg = crypto_lookup_skcipher(alg_name, type, mask);
688 if (IS_ERR(alg)) {
689 err = PTR_ERR(alg);
690 goto err;
691 }
692
693 tfm = __crypto_alloc_tfm(alg, type, mask);
694 if (!IS_ERR(tfm))
695 return __crypto_ablkcipher_cast(tfm);
696
697 crypto_mod_put(alg);
698 err = PTR_ERR(tfm);
699
700 err:
701 if (err != -EAGAIN)
702 break;
703 if (signal_pending(current)) {
704 err = -EINTR;
705 break;
706 }
707 }
708
709 return ERR_PTR(err);
710 }
711 EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
712
skcipher_module_init(void)713 static int __init skcipher_module_init(void)
714 {
715 skcipher_default_geniv = num_possible_cpus() > 1 ?
716 "eseqiv" : "chainiv";
717 return 0;
718 }
719
skcipher_module_exit(void)720 static void skcipher_module_exit(void)
721 {
722 }
723
724 module_init(skcipher_module_init);
725 module_exit(skcipher_module_exit);
726