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TOMOYO Linux Cross Reference
Linux/crypto/ablkcipher.c

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  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 
 46 static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
 47 {
 48         scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
 49 }
 50 
 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 
 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  */
 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 
 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 
 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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
348 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
349                                               u32 mask)
350 {
351         return alg->cra_ctxsize;
352 }
353 
354 int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
355 {
356         return crypto_ablkcipher_encrypt(&req->creq);
357 }
358 
359 int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
360 {
361         return crypto_ablkcipher_decrypt(&req->creq);
362 }
363 
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
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         if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
401                     sizeof(struct crypto_report_blkcipher), &rblkcipher))
402                 goto nla_put_failure;
403         return 0;
404 
405 nla_put_failure:
406         return -EMSGSIZE;
407 }
408 #else
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));
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 
441 static int no_givdecrypt(struct skcipher_givcrypt_request *req)
442 {
443         return -ENOSYS;
444 }
445 
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
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         if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
482                     sizeof(struct crypto_report_blkcipher), &rblkcipher))
483                 goto nla_put_failure;
484         return 0;
485 
486 nla_put_failure:
487         return -EMSGSIZE;
488 }
489 #else
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));
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 
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 
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 
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 
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 
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 
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 
720 static void skcipher_module_exit(void)
721 {
722 }
723 
724 module_init(skcipher_module_init);
725 module_exit(skcipher_module_exit);
726 

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