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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
25static const struct crypto_type crypto_shash_type;
26
27static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
28 unsigned int keylen)
29{
30 return -ENOSYS;
31}
32
33static 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
54int 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}
65EXPORT_SYMBOL_GPL(crypto_shash_setkey);
66
67static 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
74static 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
98int 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}
110EXPORT_SYMBOL_GPL(crypto_shash_update);
111
112static 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
129out:
130 memset(buf, 0, ds);
131 return err;
132}
133
134int 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}
145EXPORT_SYMBOL_GPL(crypto_shash_final);
146
147static 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
154int 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}
166EXPORT_SYMBOL_GPL(crypto_shash_finup);
167
168static 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
175int 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}
187EXPORT_SYMBOL_GPL(crypto_shash_digest);
188
189static 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
195static 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
201static 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
209static 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
220int 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}
231EXPORT_SYMBOL_GPL(shash_ahash_update);
232
233static int shash_async_update(struct ahash_request *req)
234{
235 return shash_ahash_update(req, ahash_request_ctx(req));
236}
237
238static int shash_async_final(struct ahash_request *req)
239{
240 return crypto_shash_final(ahash_request_ctx(req), req->result);
241}
242
243int 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}
262EXPORT_SYMBOL_GPL(shash_ahash_finup);
263
264static 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
275int 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}
296EXPORT_SYMBOL_GPL(shash_ahash_digest);
297
298static 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
309static int shash_async_export(struct ahash_request *req, void *out)
310{
311 return crypto_shash_export(ahash_request_ctx(req), out);
312}
313
314static 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
325static 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
332int 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
358 if (alg->setkey)
359 crt->setkey = shash_async_setkey;
360 if (alg->export)
361 crt->export = shash_async_export;
362 if (alg->import)
363 crt->import = shash_async_import;
364
365 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
366
367 return 0;
368}
369
370static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
371 unsigned int keylen)
372{
373 struct shash_desc **descp = crypto_hash_ctx(tfm);
374 struct shash_desc *desc = *descp;
375
376 return crypto_shash_setkey(desc->tfm, key, keylen);
377}
378
379static int shash_compat_init(struct hash_desc *hdesc)
380{
381 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
382 struct shash_desc *desc = *descp;
383
384 desc->flags = hdesc->flags;
385
386 return crypto_shash_init(desc);
387}
388
389static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
390 unsigned int len)
391{
392 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
393 struct shash_desc *desc = *descp;
394 struct crypto_hash_walk walk;
395 int nbytes;
396
397 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
398 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
399 nbytes = crypto_shash_update(desc, walk.data, nbytes);
400
401 return nbytes;
402}
403
404static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
405{
406 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
407
408 return crypto_shash_final(*descp, out);
409}
410
411static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
412 unsigned int nbytes, u8 *out)
413{
414 unsigned int offset = sg->offset;
415 int err;
416
417 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
418 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
419 struct shash_desc *desc = *descp;
420 void *data;
421
422 desc->flags = hdesc->flags;
423
424 data = kmap_atomic(sg_page(sg));
425 err = crypto_shash_digest(desc, data + offset, nbytes, out);
426 kunmap_atomic(data);
427 crypto_yield(desc->flags);
428 goto out;
429 }
430
431 err = shash_compat_init(hdesc);
432 if (err)
433 goto out;
434
435 err = shash_compat_update(hdesc, sg, nbytes);
436 if (err)
437 goto out;
438
439 err = shash_compat_final(hdesc, out);
440
441out:
442 return err;
443}
444
445static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
446{
447 struct shash_desc **descp = crypto_tfm_ctx(tfm);
448 struct shash_desc *desc = *descp;
449
450 crypto_free_shash(desc->tfm);
451 kzfree(desc);
452}
453
454static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
455{
456 struct hash_tfm *crt = &tfm->crt_hash;
457 struct crypto_alg *calg = tfm->__crt_alg;
458 struct shash_alg *alg = __crypto_shash_alg(calg);
459 struct shash_desc **descp = crypto_tfm_ctx(tfm);
460 struct crypto_shash *shash;
461 struct shash_desc *desc;
462
463 if (!crypto_mod_get(calg))
464 return -EAGAIN;
465
466 shash = crypto_create_tfm(calg, &crypto_shash_type);
467 if (IS_ERR(shash)) {
468 crypto_mod_put(calg);
469 return PTR_ERR(shash);
470 }
471
472 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
473 GFP_KERNEL);
474 if (!desc) {
475 crypto_free_shash(shash);
476 return -ENOMEM;
477 }
478
479 *descp = desc;
480 desc->tfm = shash;
481 tfm->exit = crypto_exit_shash_ops_compat;
482
483 crt->init = shash_compat_init;
484 crt->update = shash_compat_update;
485 crt->final = shash_compat_final;
486 crt->digest = shash_compat_digest;
487 crt->setkey = shash_compat_setkey;
488
489 crt->digestsize = alg->digestsize;
490
491 return 0;
492}
493
494static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
495{
496 switch (mask & CRYPTO_ALG_TYPE_MASK) {
497 case CRYPTO_ALG_TYPE_HASH_MASK:
498 return crypto_init_shash_ops_compat(tfm);
499 }
500
501 return -EINVAL;
502}
503
504static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
505 u32 mask)
506{
507 switch (mask & CRYPTO_ALG_TYPE_MASK) {
508 case CRYPTO_ALG_TYPE_HASH_MASK:
509 return sizeof(struct shash_desc *);
510 }
511
512 return 0;
513}
514
515static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
516{
517 struct crypto_shash *hash = __crypto_shash_cast(tfm);
518
519 hash->descsize = crypto_shash_alg(hash)->descsize;
520 return 0;
521}
522
523#ifdef CONFIG_NET
524static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
525{
526 struct crypto_report_hash rhash;
527 struct shash_alg *salg = __crypto_shash_alg(alg);
528
529 strncpy(rhash.type, "shash", sizeof(rhash.type));
530
531 rhash.blocksize = alg->cra_blocksize;
532 rhash.digestsize = salg->digestsize;
533
534 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
535 sizeof(struct crypto_report_hash), &rhash))
536 goto nla_put_failure;
537 return 0;
538
539nla_put_failure:
540 return -EMSGSIZE;
541}
542#else
543static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
544{
545 return -ENOSYS;
546}
547#endif
548
549static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
550 __attribute__ ((unused));
551static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
552{
553 struct shash_alg *salg = __crypto_shash_alg(alg);
554
555 seq_printf(m, "type : shash\n");
556 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
557 seq_printf(m, "digestsize : %u\n", salg->digestsize);
558}
559
560static const struct crypto_type crypto_shash_type = {
561 .ctxsize = crypto_shash_ctxsize,
562 .extsize = crypto_alg_extsize,
563 .init = crypto_init_shash_ops,
564 .init_tfm = crypto_shash_init_tfm,
565#ifdef CONFIG_PROC_FS
566 .show = crypto_shash_show,
567#endif
568 .report = crypto_shash_report,
569 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
570 .maskset = CRYPTO_ALG_TYPE_MASK,
571 .type = CRYPTO_ALG_TYPE_SHASH,
572 .tfmsize = offsetof(struct crypto_shash, base),
573};
574
575struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
576 u32 mask)
577{
578 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
579}
580EXPORT_SYMBOL_GPL(crypto_alloc_shash);
581
582static int shash_prepare_alg(struct shash_alg *alg)
583{
584 struct crypto_alg *base = &alg->base;
585
586 if (alg->digestsize > PAGE_SIZE / 8 ||
587 alg->descsize > PAGE_SIZE / 8 ||
588 alg->statesize > PAGE_SIZE / 8)
589 return -EINVAL;
590
591 base->cra_type = &crypto_shash_type;
592 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
593 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
594
595 if (!alg->finup)
596 alg->finup = shash_finup_unaligned;
597 if (!alg->digest)
598 alg->digest = shash_digest_unaligned;
599 if (!alg->export) {
600 alg->export = shash_default_export;
601 alg->import = shash_default_import;
602 alg->statesize = alg->descsize;
603 }
604 if (!alg->setkey)
605 alg->setkey = shash_no_setkey;
606
607 return 0;
608}
609
610int crypto_register_shash(struct shash_alg *alg)
611{
612 struct crypto_alg *base = &alg->base;
613 int err;
614
615 err = shash_prepare_alg(alg);
616 if (err)
617 return err;
618
619 return crypto_register_alg(base);
620}
621EXPORT_SYMBOL_GPL(crypto_register_shash);
622
623int crypto_unregister_shash(struct shash_alg *alg)
624{
625 return crypto_unregister_alg(&alg->base);
626}
627EXPORT_SYMBOL_GPL(crypto_unregister_shash);
628
629int crypto_register_shashes(struct shash_alg *algs, int count)
630{
631 int i, ret;
632
633 for (i = 0; i < count; i++) {
634 ret = crypto_register_shash(&algs[i]);
635 if (ret)
636 goto err;
637 }
638
639 return 0;
640
641err:
642 for (--i; i >= 0; --i)
643 crypto_unregister_shash(&algs[i]);
644
645 return ret;
646}
647EXPORT_SYMBOL_GPL(crypto_register_shashes);
648
649int crypto_unregister_shashes(struct shash_alg *algs, int count)
650{
651 int i, ret;
652
653 for (i = count - 1; i >= 0; --i) {
654 ret = crypto_unregister_shash(&algs[i]);
655 if (ret)
656 pr_err("Failed to unregister %s %s: %d\n",
657 algs[i].base.cra_driver_name,
658 algs[i].base.cra_name, ret);
659 }
660
661 return 0;
662}
663EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
664
665int shash_register_instance(struct crypto_template *tmpl,
666 struct shash_instance *inst)
667{
668 int err;
669
670 err = shash_prepare_alg(&inst->alg);
671 if (err)
672 return err;
673
674 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
675}
676EXPORT_SYMBOL_GPL(shash_register_instance);
677
678void shash_free_instance(struct crypto_instance *inst)
679{
680 crypto_drop_spawn(crypto_instance_ctx(inst));
681 kfree(shash_instance(inst));
682}
683EXPORT_SYMBOL_GPL(shash_free_instance);
684
685int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
686 struct shash_alg *alg,
687 struct crypto_instance *inst)
688{
689 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
690 &crypto_shash_type);
691}
692EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
693
694struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
695{
696 struct crypto_alg *alg;
697
698 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
699 return IS_ERR(alg) ? ERR_CAST(alg) :
700 container_of(alg, struct shash_alg, base);
701}
702EXPORT_SYMBOL_GPL(shash_attr_alg);
703
704MODULE_LICENSE("GPL");
705MODULE_DESCRIPTION("Synchronous cryptographic hash type");
706
