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TOMOYO Linux Cross Reference
Linux/crypto/ablkcipher.c

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

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