Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

Linux/crypto/shash.c

  1 /*
  2  * Synchronous Cryptographic Hash operations.
  3  *
  4  * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License as published by the Free
  8  * Software Foundation; either version 2 of the License, or (at your option)
  9  * any later version.
 10  *
 11  */
 12 
 13 #include <crypto/scatterwalk.h>
 14 #include <crypto/internal/hash.h>
 15 #include <linux/err.h>
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/slab.h>
 19 #include <linux/seq_file.h>
 20 #include <linux/cryptouser.h>
 21 #include <net/netlink.h>
 22 
 23 #include "internal.h"
 24 
 25 static const struct crypto_type crypto_shash_type;
 26 
 27 static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
 28                            unsigned int keylen)
 29 {
 30         return -ENOSYS;
 31 }
 32 
 33 static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
 34                                   unsigned int keylen)
 35 {
 36         struct shash_alg *shash = crypto_shash_alg(tfm);
 37         unsigned long alignmask = crypto_shash_alignmask(tfm);
 38         unsigned long absize;
 39         u8 *buffer, *alignbuffer;
 40         int err;
 41 
 42         absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
 43         buffer = kmalloc(absize, GFP_KERNEL);
 44         if (!buffer)
 45                 return -ENOMEM;
 46 
 47         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 48         memcpy(alignbuffer, key, keylen);
 49         err = shash->setkey(tfm, alignbuffer, keylen);
 50         kzfree(buffer);
 51         return err;
 52 }
 53 
 54 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
 55                         unsigned int keylen)
 56 {
 57         struct shash_alg *shash = crypto_shash_alg(tfm);
 58         unsigned long alignmask = crypto_shash_alignmask(tfm);
 59 
 60         if ((unsigned long)key & alignmask)
 61                 return shash_setkey_unaligned(tfm, key, keylen);
 62 
 63         return shash->setkey(tfm, key, keylen);
 64 }
 65 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
 66 
 67 static inline unsigned int shash_align_buffer_size(unsigned len,
 68                                                    unsigned long mask)
 69 {
 70         typedef u8 __attribute__ ((aligned)) u8_aligned;
 71         return len + (mask & ~(__alignof__(u8_aligned) - 1));
 72 }
 73 
 74 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
 75                                   unsigned int len)
 76 {
 77         struct crypto_shash *tfm = desc->tfm;
 78         struct shash_alg *shash = crypto_shash_alg(tfm);
 79         unsigned long alignmask = crypto_shash_alignmask(tfm);
 80         unsigned int unaligned_len = alignmask + 1 -
 81                                      ((unsigned long)data & alignmask);
 82         u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
 83                 __attribute__ ((aligned));
 84         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
 85         int err;
 86 
 87         if (unaligned_len > len)
 88                 unaligned_len = len;
 89 
 90         memcpy(buf, data, unaligned_len);
 91         err = shash->update(desc, buf, unaligned_len);
 92         memset(buf, 0, unaligned_len);
 93 
 94         return err ?:
 95                shash->update(desc, data + unaligned_len, len - unaligned_len);
 96 }
 97 
 98 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
 99                         unsigned int len)
100 {
101         struct crypto_shash *tfm = desc->tfm;
102         struct shash_alg *shash = crypto_shash_alg(tfm);
103         unsigned long alignmask = crypto_shash_alignmask(tfm);
104 
105         if ((unsigned long)data & alignmask)
106                 return shash_update_unaligned(desc, data, len);
107 
108         return shash->update(desc, data, len);
109 }
110 EXPORT_SYMBOL_GPL(crypto_shash_update);
111 
112 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
113 {
114         struct crypto_shash *tfm = desc->tfm;
115         unsigned long alignmask = crypto_shash_alignmask(tfm);
116         struct shash_alg *shash = crypto_shash_alg(tfm);
117         unsigned int ds = crypto_shash_digestsize(tfm);
118         u8 ubuf[shash_align_buffer_size(ds, alignmask)]
119                 __attribute__ ((aligned));
120         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
121         int err;
122 
123         err = shash->final(desc, buf);
124         if (err)
125                 goto out;
126 
127         memcpy(out, buf, ds);
128 
129 out:
130         memset(buf, 0, ds);
131         return err;
132 }
133 
134 int crypto_shash_final(struct shash_desc *desc, u8 *out)
135 {
136         struct crypto_shash *tfm = desc->tfm;
137         struct shash_alg *shash = crypto_shash_alg(tfm);
138         unsigned long alignmask = crypto_shash_alignmask(tfm);
139 
140         if ((unsigned long)out & alignmask)
141                 return shash_final_unaligned(desc, out);
142 
143         return shash->final(desc, out);
144 }
145 EXPORT_SYMBOL_GPL(crypto_shash_final);
146 
147 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
148                                  unsigned int len, u8 *out)
149 {
150         return crypto_shash_update(desc, data, len) ?:
151                crypto_shash_final(desc, out);
152 }
153 
154 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
155                        unsigned int len, u8 *out)
156 {
157         struct crypto_shash *tfm = desc->tfm;
158         struct shash_alg *shash = crypto_shash_alg(tfm);
159         unsigned long alignmask = crypto_shash_alignmask(tfm);
160 
161         if (((unsigned long)data | (unsigned long)out) & alignmask)
162                 return shash_finup_unaligned(desc, data, len, out);
163 
164         return shash->finup(desc, data, len, out);
165 }
166 EXPORT_SYMBOL_GPL(crypto_shash_finup);
167 
168 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
169                                   unsigned int len, u8 *out)
170 {
171         return crypto_shash_init(desc) ?:
172                crypto_shash_finup(desc, data, len, out);
173 }
174 
175 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
176                         unsigned int len, u8 *out)
177 {
178         struct crypto_shash *tfm = desc->tfm;
179         struct shash_alg *shash = crypto_shash_alg(tfm);
180         unsigned long alignmask = crypto_shash_alignmask(tfm);
181 
182         if (((unsigned long)data | (unsigned long)out) & alignmask)
183                 return shash_digest_unaligned(desc, data, len, out);
184 
185         return shash->digest(desc, data, len, out);
186 }
187 EXPORT_SYMBOL_GPL(crypto_shash_digest);
188 
189 static int shash_default_export(struct shash_desc *desc, void *out)
190 {
191         memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
192         return 0;
193 }
194 
195 static int shash_default_import(struct shash_desc *desc, const void *in)
196 {
197         memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
198         return 0;
199 }
200 
201 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
202                               unsigned int keylen)
203 {
204         struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
205 
206         return crypto_shash_setkey(*ctx, key, keylen);
207 }
208 
209 static int shash_async_init(struct ahash_request *req)
210 {
211         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
212         struct shash_desc *desc = ahash_request_ctx(req);
213 
214         desc->tfm = *ctx;
215         desc->flags = req->base.flags;
216 
217         return crypto_shash_init(desc);
218 }
219 
220 int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
221 {
222         struct crypto_hash_walk walk;
223         int nbytes;
224 
225         for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
226              nbytes = crypto_hash_walk_done(&walk, nbytes))
227                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
228 
229         return nbytes;
230 }
231 EXPORT_SYMBOL_GPL(shash_ahash_update);
232 
233 static int shash_async_update(struct ahash_request *req)
234 {
235         return shash_ahash_update(req, ahash_request_ctx(req));
236 }
237 
238 static int shash_async_final(struct ahash_request *req)
239 {
240         return crypto_shash_final(ahash_request_ctx(req), req->result);
241 }
242 
243 int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
244 {
245         struct crypto_hash_walk walk;
246         int nbytes;
247 
248         nbytes = crypto_hash_walk_first(req, &walk);
249         if (!nbytes)
250                 return crypto_shash_final(desc, req->result);
251 
252         do {
253                 nbytes = crypto_hash_walk_last(&walk) ?
254                          crypto_shash_finup(desc, walk.data, nbytes,
255                                             req->result) :
256                          crypto_shash_update(desc, walk.data, nbytes);
257                 nbytes = crypto_hash_walk_done(&walk, nbytes);
258         } while (nbytes > 0);
259 
260         return nbytes;
261 }
262 EXPORT_SYMBOL_GPL(shash_ahash_finup);
263 
264 static int shash_async_finup(struct ahash_request *req)
265 {
266         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
267         struct shash_desc *desc = ahash_request_ctx(req);
268 
269         desc->tfm = *ctx;
270         desc->flags = req->base.flags;
271 
272         return shash_ahash_finup(req, desc);
273 }
274 
275 int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
276 {
277         struct scatterlist *sg = req->src;
278         unsigned int offset = sg->offset;
279         unsigned int nbytes = req->nbytes;
280         int err;
281 
282         if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
283                 void *data;
284 
285                 data = kmap_atomic(sg_page(sg));
286                 err = crypto_shash_digest(desc, data + offset, nbytes,
287                                           req->result);
288                 kunmap_atomic(data);
289                 crypto_yield(desc->flags);
290         } else
291                 err = crypto_shash_init(desc) ?:
292                       shash_ahash_finup(req, desc);
293 
294         return err;
295 }
296 EXPORT_SYMBOL_GPL(shash_ahash_digest);
297 
298 static int shash_async_digest(struct ahash_request *req)
299 {
300         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
301         struct shash_desc *desc = ahash_request_ctx(req);
302 
303         desc->tfm = *ctx;
304         desc->flags = req->base.flags;
305 
306         return shash_ahash_digest(req, desc);
307 }
308 
309 static int shash_async_export(struct ahash_request *req, void *out)
310 {
311         return crypto_shash_export(ahash_request_ctx(req), out);
312 }
313 
314 static int shash_async_import(struct ahash_request *req, const void *in)
315 {
316         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
317         struct shash_desc *desc = ahash_request_ctx(req);
318 
319         desc->tfm = *ctx;
320         desc->flags = req->base.flags;
321 
322         return crypto_shash_import(desc, in);
323 }
324 
325 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
326 {
327         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
328 
329         crypto_free_shash(*ctx);
330 }
331 
332 int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
333 {
334         struct crypto_alg *calg = tfm->__crt_alg;
335         struct shash_alg *alg = __crypto_shash_alg(calg);
336         struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
337         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
338         struct crypto_shash *shash;
339 
340         if (!crypto_mod_get(calg))
341                 return -EAGAIN;
342 
343         shash = crypto_create_tfm(calg, &crypto_shash_type);
344         if (IS_ERR(shash)) {
345                 crypto_mod_put(calg);
346                 return PTR_ERR(shash);
347         }
348 
349         *ctx = shash;
350         tfm->exit = crypto_exit_shash_ops_async;
351 
352         crt->init = shash_async_init;
353         crt->update = shash_async_update;
354         crt->final = shash_async_final;
355         crt->finup = shash_async_finup;
356         crt->digest = shash_async_digest;
357         crt->setkey = shash_async_setkey;
358 
359         crt->has_setkey = alg->setkey != shash_no_setkey;
360 
361         if (alg->export)
362                 crt->export = shash_async_export;
363         if (alg->import)
364                 crt->import = shash_async_import;
365 
366         crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
367 
368         return 0;
369 }
370 
371 static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
372                                unsigned int keylen)
373 {
374         struct shash_desc **descp = crypto_hash_ctx(tfm);
375         struct shash_desc *desc = *descp;
376 
377         return crypto_shash_setkey(desc->tfm, key, keylen);
378 }
379 
380 static int shash_compat_init(struct hash_desc *hdesc)
381 {
382         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
383         struct shash_desc *desc = *descp;
384 
385         desc->flags = hdesc->flags;
386 
387         return crypto_shash_init(desc);
388 }
389 
390 static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
391                                unsigned int len)
392 {
393         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
394         struct shash_desc *desc = *descp;
395         struct crypto_hash_walk walk;
396         int nbytes;
397 
398         for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
399              nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
400                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
401 
402         return nbytes;
403 }
404 
405 static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
406 {
407         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
408 
409         return crypto_shash_final(*descp, out);
410 }
411 
412 static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
413                                unsigned int nbytes, u8 *out)
414 {
415         unsigned int offset = sg->offset;
416         int err;
417 
418         if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
419                 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
420                 struct shash_desc *desc = *descp;
421                 void *data;
422 
423                 desc->flags = hdesc->flags;
424 
425                 data = kmap_atomic(sg_page(sg));
426                 err = crypto_shash_digest(desc, data + offset, nbytes, out);
427                 kunmap_atomic(data);
428                 crypto_yield(desc->flags);
429                 goto out;
430         }
431 
432         err = shash_compat_init(hdesc);
433         if (err)
434                 goto out;
435 
436         err = shash_compat_update(hdesc, sg, nbytes);
437         if (err)
438                 goto out;
439 
440         err = shash_compat_final(hdesc, out);
441 
442 out:
443         return err;
444 }
445 
446 static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
447 {
448         struct shash_desc **descp = crypto_tfm_ctx(tfm);
449         struct shash_desc *desc = *descp;
450 
451         crypto_free_shash(desc->tfm);
452         kzfree(desc);
453 }
454 
455 static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
456 {
457         struct hash_tfm *crt = &tfm->crt_hash;
458         struct crypto_alg *calg = tfm->__crt_alg;
459         struct shash_alg *alg = __crypto_shash_alg(calg);
460         struct shash_desc **descp = crypto_tfm_ctx(tfm);
461         struct crypto_shash *shash;
462         struct shash_desc *desc;
463 
464         if (!crypto_mod_get(calg))
465                 return -EAGAIN;
466 
467         shash = crypto_create_tfm(calg, &crypto_shash_type);
468         if (IS_ERR(shash)) {
469                 crypto_mod_put(calg);
470                 return PTR_ERR(shash);
471         }
472 
473         desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
474                        GFP_KERNEL);
475         if (!desc) {
476                 crypto_free_shash(shash);
477                 return -ENOMEM;
478         }
479 
480         *descp = desc;
481         desc->tfm = shash;
482         tfm->exit = crypto_exit_shash_ops_compat;
483 
484         crt->init = shash_compat_init;
485         crt->update = shash_compat_update;
486         crt->final  = shash_compat_final;
487         crt->digest = shash_compat_digest;
488         crt->setkey = shash_compat_setkey;
489 
490         crt->digestsize = alg->digestsize;
491 
492         return 0;
493 }
494 
495 static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
496 {
497         switch (mask & CRYPTO_ALG_TYPE_MASK) {
498         case CRYPTO_ALG_TYPE_HASH_MASK:
499                 return crypto_init_shash_ops_compat(tfm);
500         }
501 
502         return -EINVAL;
503 }
504 
505 static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
506                                          u32 mask)
507 {
508         switch (mask & CRYPTO_ALG_TYPE_MASK) {
509         case CRYPTO_ALG_TYPE_HASH_MASK:
510                 return sizeof(struct shash_desc *);
511         }
512 
513         return 0;
514 }
515 
516 static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
517 {
518         struct crypto_shash *hash = __crypto_shash_cast(tfm);
519 
520         hash->descsize = crypto_shash_alg(hash)->descsize;
521         return 0;
522 }
523 
524 #ifdef CONFIG_NET
525 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
526 {
527         struct crypto_report_hash rhash;
528         struct shash_alg *salg = __crypto_shash_alg(alg);
529 
530         strncpy(rhash.type, "shash", sizeof(rhash.type));
531 
532         rhash.blocksize = alg->cra_blocksize;
533         rhash.digestsize = salg->digestsize;
534 
535         if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
536                     sizeof(struct crypto_report_hash), &rhash))
537                 goto nla_put_failure;
538         return 0;
539 
540 nla_put_failure:
541         return -EMSGSIZE;
542 }
543 #else
544 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
545 {
546         return -ENOSYS;
547 }
548 #endif
549 
550 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
551         __attribute__ ((unused));
552 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
553 {
554         struct shash_alg *salg = __crypto_shash_alg(alg);
555 
556         seq_printf(m, "type         : shash\n");
557         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
558         seq_printf(m, "digestsize   : %u\n", salg->digestsize);
559 }
560 
561 static const struct crypto_type crypto_shash_type = {
562         .ctxsize = crypto_shash_ctxsize,
563         .extsize = crypto_alg_extsize,
564         .init = crypto_init_shash_ops,
565         .init_tfm = crypto_shash_init_tfm,
566 #ifdef CONFIG_PROC_FS
567         .show = crypto_shash_show,
568 #endif
569         .report = crypto_shash_report,
570         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
571         .maskset = CRYPTO_ALG_TYPE_MASK,
572         .type = CRYPTO_ALG_TYPE_SHASH,
573         .tfmsize = offsetof(struct crypto_shash, base),
574 };
575 
576 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
577                                         u32 mask)
578 {
579         return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
580 }
581 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
582 
583 static int shash_prepare_alg(struct shash_alg *alg)
584 {
585         struct crypto_alg *base = &alg->base;
586 
587         if (alg->digestsize > PAGE_SIZE / 8 ||
588             alg->descsize > PAGE_SIZE / 8 ||
589             alg->statesize > PAGE_SIZE / 8)
590                 return -EINVAL;
591 
592         base->cra_type = &crypto_shash_type;
593         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
594         base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
595 
596         if (!alg->finup)
597                 alg->finup = shash_finup_unaligned;
598         if (!alg->digest)
599                 alg->digest = shash_digest_unaligned;
600         if (!alg->export) {
601                 alg->export = shash_default_export;
602                 alg->import = shash_default_import;
603                 alg->statesize = alg->descsize;
604         }
605         if (!alg->setkey)
606                 alg->setkey = shash_no_setkey;
607 
608         return 0;
609 }
610 
611 int crypto_register_shash(struct shash_alg *alg)
612 {
613         struct crypto_alg *base = &alg->base;
614         int err;
615 
616         err = shash_prepare_alg(alg);
617         if (err)
618                 return err;
619 
620         return crypto_register_alg(base);
621 }
622 EXPORT_SYMBOL_GPL(crypto_register_shash);
623 
624 int crypto_unregister_shash(struct shash_alg *alg)
625 {
626         return crypto_unregister_alg(&alg->base);
627 }
628 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
629 
630 int crypto_register_shashes(struct shash_alg *algs, int count)
631 {
632         int i, ret;
633 
634         for (i = 0; i < count; i++) {
635                 ret = crypto_register_shash(&algs[i]);
636                 if (ret)
637                         goto err;
638         }
639 
640         return 0;
641 
642 err:
643         for (--i; i >= 0; --i)
644                 crypto_unregister_shash(&algs[i]);
645 
646         return ret;
647 }
648 EXPORT_SYMBOL_GPL(crypto_register_shashes);
649 
650 int crypto_unregister_shashes(struct shash_alg *algs, int count)
651 {
652         int i, ret;
653 
654         for (i = count - 1; i >= 0; --i) {
655                 ret = crypto_unregister_shash(&algs[i]);
656                 if (ret)
657                         pr_err("Failed to unregister %s %s: %d\n",
658                                algs[i].base.cra_driver_name,
659                                algs[i].base.cra_name, ret);
660         }
661 
662         return 0;
663 }
664 EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
665 
666 int shash_register_instance(struct crypto_template *tmpl,
667                             struct shash_instance *inst)
668 {
669         int err;
670 
671         err = shash_prepare_alg(&inst->alg);
672         if (err)
673                 return err;
674 
675         return crypto_register_instance(tmpl, shash_crypto_instance(inst));
676 }
677 EXPORT_SYMBOL_GPL(shash_register_instance);
678 
679 void shash_free_instance(struct crypto_instance *inst)
680 {
681         crypto_drop_spawn(crypto_instance_ctx(inst));
682         kfree(shash_instance(inst));
683 }
684 EXPORT_SYMBOL_GPL(shash_free_instance);
685 
686 int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
687                             struct shash_alg *alg,
688                             struct crypto_instance *inst)
689 {
690         return crypto_init_spawn2(&spawn->base, &alg->base, inst,
691                                   &crypto_shash_type);
692 }
693 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
694 
695 struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
696 {
697         struct crypto_alg *alg;
698 
699         alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
700         return IS_ERR(alg) ? ERR_CAST(alg) :
701                container_of(alg, struct shash_alg, base);
702 }
703 EXPORT_SYMBOL_GPL(shash_attr_alg);
704 
705 MODULE_LICENSE("GPL");
706 MODULE_DESCRIPTION("Synchronous cryptographic hash type");
707 

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