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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
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 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
71}
72
73static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
74 unsigned int len)
75{
76 struct crypto_shash *tfm = desc->tfm;
77 struct shash_alg *shash = crypto_shash_alg(tfm);
78 unsigned long alignmask = crypto_shash_alignmask(tfm);
79 unsigned int unaligned_len = alignmask + 1 -
80 ((unsigned long)data & alignmask);
81 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
82 __attribute__ ((aligned));
83 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
84 int err;
85
86 if (unaligned_len > len)
87 unaligned_len = len;
88
89 memcpy(buf, data, unaligned_len);
90 err = shash->update(desc, buf, unaligned_len);
91 memset(buf, 0, unaligned_len);
92
93 return err ?:
94 shash->update(desc, data + unaligned_len, len - unaligned_len);
95}
96
97int crypto_shash_update(struct shash_desc *desc, const u8 *data,
98 unsigned int len)
99{
100 struct crypto_shash *tfm = desc->tfm;
101 struct shash_alg *shash = crypto_shash_alg(tfm);
102 unsigned long alignmask = crypto_shash_alignmask(tfm);
103
104 if ((unsigned long)data & alignmask)
105 return shash_update_unaligned(desc, data, len);
106
107 return shash->update(desc, data, len);
108}
109EXPORT_SYMBOL_GPL(crypto_shash_update);
110
111static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
112{
113 struct crypto_shash *tfm = desc->tfm;
114 unsigned long alignmask = crypto_shash_alignmask(tfm);
115 struct shash_alg *shash = crypto_shash_alg(tfm);
116 unsigned int ds = crypto_shash_digestsize(tfm);
117 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
118 __attribute__ ((aligned));
119 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
120 int err;
121
122 err = shash->final(desc, buf);
123 if (err)
124 goto out;
125
126 memcpy(out, buf, ds);
127
128out:
129 memset(buf, 0, ds);
130 return err;
131}
132
133int crypto_shash_final(struct shash_desc *desc, u8 *out)
134{
135 struct crypto_shash *tfm = desc->tfm;
136 struct shash_alg *shash = crypto_shash_alg(tfm);
137 unsigned long alignmask = crypto_shash_alignmask(tfm);
138
139 if ((unsigned long)out & alignmask)
140 return shash_final_unaligned(desc, out);
141
142 return shash->final(desc, out);
143}
144EXPORT_SYMBOL_GPL(crypto_shash_final);
145
146static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
147 unsigned int len, u8 *out)
148{
149 return crypto_shash_update(desc, data, len) ?:
150 crypto_shash_final(desc, out);
151}
152
153int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
154 unsigned int len, u8 *out)
155{
156 struct crypto_shash *tfm = desc->tfm;
157 struct shash_alg *shash = crypto_shash_alg(tfm);
158 unsigned long alignmask = crypto_shash_alignmask(tfm);
159
160 if (((unsigned long)data | (unsigned long)out) & alignmask)
161 return shash_finup_unaligned(desc, data, len, out);
162
163 return shash->finup(desc, data, len, out);
164}
165EXPORT_SYMBOL_GPL(crypto_shash_finup);
166
167static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
168 unsigned int len, u8 *out)
169{
170 return crypto_shash_init(desc) ?:
171 crypto_shash_finup(desc, data, len, out);
172}
173
174int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
175 unsigned int len, u8 *out)
176{
177 struct crypto_shash *tfm = desc->tfm;
178 struct shash_alg *shash = crypto_shash_alg(tfm);
179 unsigned long alignmask = crypto_shash_alignmask(tfm);
180
181 if (((unsigned long)data | (unsigned long)out) & alignmask)
182 return shash_digest_unaligned(desc, data, len, out);
183
184 return shash->digest(desc, data, len, out);
185}
186EXPORT_SYMBOL_GPL(crypto_shash_digest);
187
188static int shash_default_export(struct shash_desc *desc, void *out)
189{
190 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
191 return 0;
192}
193
194static int shash_default_import(struct shash_desc *desc, const void *in)
195{
196 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
197 return 0;
198}
199
200static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
201 unsigned int keylen)
202{
203 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
204
205 return crypto_shash_setkey(*ctx, key, keylen);
206}
207
208static int shash_async_init(struct ahash_request *req)
209{
210 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
211 struct shash_desc *desc = ahash_request_ctx(req);
212
213 desc->tfm = *ctx;
214 desc->flags = req->base.flags;
215
216 return crypto_shash_init(desc);
217}
218
219int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
220{
221 struct crypto_hash_walk walk;
222 int nbytes;
223
224 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
225 nbytes = crypto_hash_walk_done(&walk, nbytes))
226 nbytes = crypto_shash_update(desc, walk.data, nbytes);
227
228 return nbytes;
229}
230EXPORT_SYMBOL_GPL(shash_ahash_update);
231
232static int shash_async_update(struct ahash_request *req)
233{
234 return shash_ahash_update(req, ahash_request_ctx(req));
235}
236
237static int shash_async_final(struct ahash_request *req)
238{
239 return crypto_shash_final(ahash_request_ctx(req), req->result);
240}
241
242int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
243{
244 struct crypto_hash_walk walk;
245 int nbytes;
246
247 nbytes = crypto_hash_walk_first(req, &walk);
248 if (!nbytes)
249 return crypto_shash_final(desc, req->result);
250
251 do {
252 nbytes = crypto_hash_walk_last(&walk) ?
253 crypto_shash_finup(desc, walk.data, nbytes,
254 req->result) :
255 crypto_shash_update(desc, walk.data, nbytes);
256 nbytes = crypto_hash_walk_done(&walk, nbytes);
257 } while (nbytes > 0);
258
259 return nbytes;
260}
261EXPORT_SYMBOL_GPL(shash_ahash_finup);
262
263static int shash_async_finup(struct ahash_request *req)
264{
265 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
266 struct shash_desc *desc = ahash_request_ctx(req);
267
268 desc->tfm = *ctx;
269 desc->flags = req->base.flags;
270
271 return shash_ahash_finup(req, desc);
272}
273
274int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
275{
276 struct scatterlist *sg = req->src;
277 unsigned int offset = sg->offset;
278 unsigned int nbytes = req->nbytes;
279 int err;
280
281 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
282 void *data;
283
284 data = kmap_atomic(sg_page(sg));
285 err = crypto_shash_digest(desc, data + offset, nbytes,
286 req->result);
287 kunmap_atomic(data);
288 crypto_yield(desc->flags);
289 } else
290 err = crypto_shash_init(desc) ?:
291 shash_ahash_finup(req, desc);
292
293 return err;
294}
295EXPORT_SYMBOL_GPL(shash_ahash_digest);
296
297static int shash_async_digest(struct ahash_request *req)
298{
299 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
300 struct shash_desc *desc = ahash_request_ctx(req);
301
302 desc->tfm = *ctx;
303 desc->flags = req->base.flags;
304
305 return shash_ahash_digest(req, desc);
306}
307
308static int shash_async_export(struct ahash_request *req, void *out)
309{
310 return crypto_shash_export(ahash_request_ctx(req), out);
311}
312
313static int shash_async_import(struct ahash_request *req, const void *in)
314{
315 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
316 struct shash_desc *desc = ahash_request_ctx(req);
317
318 desc->tfm = *ctx;
319 desc->flags = req->base.flags;
320
321 return crypto_shash_import(desc, in);
322}
323
324static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
325{
326 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
327
328 crypto_free_shash(*ctx);
329}
330
331int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
332{
333 struct crypto_alg *calg = tfm->__crt_alg;
334 struct shash_alg *alg = __crypto_shash_alg(calg);
335 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
336 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
337 struct crypto_shash *shash;
338
339 if (!crypto_mod_get(calg))
340 return -EAGAIN;
341
342 shash = crypto_create_tfm(calg, &crypto_shash_type);
343 if (IS_ERR(shash)) {
344 crypto_mod_put(calg);
345 return PTR_ERR(shash);
346 }
347
348 *ctx = shash;
349 tfm->exit = crypto_exit_shash_ops_async;
350
351 crt->init = shash_async_init;
352 crt->update = shash_async_update;
353 crt->final = shash_async_final;
354 crt->finup = shash_async_finup;
355 crt->digest = shash_async_digest;
356
357 if (alg->setkey)
358 crt->setkey = shash_async_setkey;
359 if (alg->export)
360 crt->export = shash_async_export;
361 if (alg->import)
362 crt->import = shash_async_import;
363
364 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
365
366 return 0;
367}
368
369static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
370 unsigned int keylen)
371{
372 struct shash_desc **descp = crypto_hash_ctx(tfm);
373 struct shash_desc *desc = *descp;
374
375 return crypto_shash_setkey(desc->tfm, key, keylen);
376}
377
378static int shash_compat_init(struct hash_desc *hdesc)
379{
380 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
381 struct shash_desc *desc = *descp;
382
383 desc->flags = hdesc->flags;
384
385 return crypto_shash_init(desc);
386}
387
388static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
389 unsigned int len)
390{
391 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
392 struct shash_desc *desc = *descp;
393 struct crypto_hash_walk walk;
394 int nbytes;
395
396 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
397 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
398 nbytes = crypto_shash_update(desc, walk.data, nbytes);
399
400 return nbytes;
401}
402
403static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
404{
405 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
406
407 return crypto_shash_final(*descp, out);
408}
409
410static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
411 unsigned int nbytes, u8 *out)
412{
413 unsigned int offset = sg->offset;
414 int err;
415
416 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
417 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
418 struct shash_desc *desc = *descp;
419 void *data;
420
421 desc->flags = hdesc->flags;
422
423 data = kmap_atomic(sg_page(sg));
424 err = crypto_shash_digest(desc, data + offset, nbytes, out);
425 kunmap_atomic(data);
426 crypto_yield(desc->flags);
427 goto out;
428 }
429
430 err = shash_compat_init(hdesc);
431 if (err)
432 goto out;
433
434 err = shash_compat_update(hdesc, sg, nbytes);
435 if (err)
436 goto out;
437
438 err = shash_compat_final(hdesc, out);
439
440out:
441 return err;
442}
443
444static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
445{
446 struct shash_desc **descp = crypto_tfm_ctx(tfm);
447 struct shash_desc *desc = *descp;
448
449 crypto_free_shash(desc->tfm);
450 kzfree(desc);
451}
452
453static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
454{
455 struct hash_tfm *crt = &tfm->crt_hash;
456 struct crypto_alg *calg = tfm->__crt_alg;
457 struct shash_alg *alg = __crypto_shash_alg(calg);
458 struct shash_desc **descp = crypto_tfm_ctx(tfm);
459 struct crypto_shash *shash;
460 struct shash_desc *desc;
461
462 if (!crypto_mod_get(calg))
463 return -EAGAIN;
464
465 shash = crypto_create_tfm(calg, &crypto_shash_type);
466 if (IS_ERR(shash)) {
467 crypto_mod_put(calg);
468 return PTR_ERR(shash);
469 }
470
471 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
472 GFP_KERNEL);
473 if (!desc) {
474 crypto_free_shash(shash);
475 return -ENOMEM;
476 }
477
478 *descp = desc;
479 desc->tfm = shash;
480 tfm->exit = crypto_exit_shash_ops_compat;
481
482 crt->init = shash_compat_init;
483 crt->update = shash_compat_update;
484 crt->final = shash_compat_final;
485 crt->digest = shash_compat_digest;
486 crt->setkey = shash_compat_setkey;
487
488 crt->digestsize = alg->digestsize;
489
490 return 0;
491}
492
493static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
494{
495 switch (mask & CRYPTO_ALG_TYPE_MASK) {
496 case CRYPTO_ALG_TYPE_HASH_MASK:
497 return crypto_init_shash_ops_compat(tfm);
498 }
499
500 return -EINVAL;
501}
502
503static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
504 u32 mask)
505{
506 switch (mask & CRYPTO_ALG_TYPE_MASK) {
507 case CRYPTO_ALG_TYPE_HASH_MASK:
508 return sizeof(struct shash_desc *);
509 }
510
511 return 0;
512}
513
514static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
515{
516 struct crypto_shash *hash = __crypto_shash_cast(tfm);
517
518 hash->descsize = crypto_shash_alg(hash)->descsize;
519 return 0;
520}
521
522static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
523{
524 return alg->cra_ctxsize;
525}
526
527#ifdef CONFIG_NET
528static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
529{
530 struct crypto_report_hash rhash;
531 struct shash_alg *salg = __crypto_shash_alg(alg);
532
533 strncpy(rhash.type, "shash", sizeof(rhash.type));
534
535 rhash.blocksize = alg->cra_blocksize;
536 rhash.digestsize = salg->digestsize;
537
538 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
539 sizeof(struct crypto_report_hash), &rhash))
540 goto nla_put_failure;
541 return 0;
542
543nla_put_failure:
544 return -EMSGSIZE;
545}
546#else
547static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
548{
549 return -ENOSYS;
550}
551#endif
552
553static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
554 __attribute__ ((unused));
555static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
556{
557 struct shash_alg *salg = __crypto_shash_alg(alg);
558
559 seq_printf(m, "type : shash\n");
560 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
561 seq_printf(m, "digestsize : %u\n", salg->digestsize);
562}
563
564static const struct crypto_type crypto_shash_type = {
565 .ctxsize = crypto_shash_ctxsize,
566 .extsize = crypto_shash_extsize,
567 .init = crypto_init_shash_ops,
568 .init_tfm = crypto_shash_init_tfm,
569#ifdef CONFIG_PROC_FS
570 .show = crypto_shash_show,
571#endif
572 .report = crypto_shash_report,
573 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
574 .maskset = CRYPTO_ALG_TYPE_MASK,
575 .type = CRYPTO_ALG_TYPE_SHASH,
576 .tfmsize = offsetof(struct crypto_shash, base),
577};
578
579struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
580 u32 mask)
581{
582 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
583}
584EXPORT_SYMBOL_GPL(crypto_alloc_shash);
585
586static int shash_prepare_alg(struct shash_alg *alg)
587{
588 struct crypto_alg *base = &alg->base;
589
590 if (alg->digestsize > PAGE_SIZE / 8 ||
591 alg->descsize > PAGE_SIZE / 8 ||
592 alg->statesize > PAGE_SIZE / 8)
593 return -EINVAL;
594
595 base->cra_type = &crypto_shash_type;
596 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
597 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
598
599 if (!alg->finup)
600 alg->finup = shash_finup_unaligned;
601 if (!alg->digest)
602 alg->digest = shash_digest_unaligned;
603 if (!alg->export) {
604 alg->export = shash_default_export;
605 alg->import = shash_default_import;
606 alg->statesize = alg->descsize;
607 }
608 if (!alg->setkey)
609 alg->setkey = shash_no_setkey;
610
611 return 0;
612}
613
614int crypto_register_shash(struct shash_alg *alg)
615{
616 struct crypto_alg *base = &alg->base;
617 int err;
618
619 err = shash_prepare_alg(alg);
620 if (err)
621 return err;
622
623 return crypto_register_alg(base);
624}
625EXPORT_SYMBOL_GPL(crypto_register_shash);
626
627int crypto_unregister_shash(struct shash_alg *alg)
628{
629 return crypto_unregister_alg(&alg->base);
630}
631EXPORT_SYMBOL_GPL(crypto_unregister_shash);
632
633int crypto_register_shashes(struct shash_alg *algs, int count)
634{
635 int i, ret;
636
637 for (i = 0; i < count; i++) {
638 ret = crypto_register_shash(&algs[i]);
639 if (ret)
640 goto err;
641 }
642
643 return 0;
644
645err:
646 for (--i; i >= 0; --i)
647 crypto_unregister_shash(&algs[i]);
648
649 return ret;
650}
651EXPORT_SYMBOL_GPL(crypto_register_shashes);
652
653int crypto_unregister_shashes(struct shash_alg *algs, int count)
654{
655 int i, ret;
656
657 for (i = count - 1; i >= 0; --i) {
658 ret = crypto_unregister_shash(&algs[i]);
659 if (ret)
660 pr_err("Failed to unregister %s %s: %d\n",
661 algs[i].base.cra_driver_name,
662 algs[i].base.cra_name, ret);
663 }
664
665 return 0;
666}
667EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
668
669int shash_register_instance(struct crypto_template *tmpl,
670 struct shash_instance *inst)
671{
672 int err;
673
674 err = shash_prepare_alg(&inst->alg);
675 if (err)
676 return err;
677
678 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
679}
680EXPORT_SYMBOL_GPL(shash_register_instance);
681
682void shash_free_instance(struct crypto_instance *inst)
683{
684 crypto_drop_spawn(crypto_instance_ctx(inst));
685 kfree(shash_instance(inst));
686}
687EXPORT_SYMBOL_GPL(shash_free_instance);
688
689int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
690 struct shash_alg *alg,
691 struct crypto_instance *inst)
692{
693 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
694 &crypto_shash_type);
695}
696EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
697
698struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
699{
700 struct crypto_alg *alg;
701
702 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
703 return IS_ERR(alg) ? ERR_CAST(alg) :
704 container_of(alg, struct shash_alg, base);
705}
706EXPORT_SYMBOL_GPL(shash_attr_alg);
707
708MODULE_LICENSE("GPL");
709MODULE_DESCRIPTION("Synchronous cryptographic hash type");
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
21#include "internal.h"
22
23static const struct crypto_type crypto_shash_type;
24
25static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
26 unsigned int keylen)
27{
28 return -ENOSYS;
29}
30
31static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
32 unsigned int keylen)
33{
34 struct shash_alg *shash = crypto_shash_alg(tfm);
35 unsigned long alignmask = crypto_shash_alignmask(tfm);
36 unsigned long absize;
37 u8 *buffer, *alignbuffer;
38 int err;
39
40 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
41 buffer = kmalloc(absize, GFP_KERNEL);
42 if (!buffer)
43 return -ENOMEM;
44
45 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
46 memcpy(alignbuffer, key, keylen);
47 err = shash->setkey(tfm, alignbuffer, keylen);
48 kzfree(buffer);
49 return err;
50}
51
52int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
53 unsigned int keylen)
54{
55 struct shash_alg *shash = crypto_shash_alg(tfm);
56 unsigned long alignmask = crypto_shash_alignmask(tfm);
57
58 if ((unsigned long)key & alignmask)
59 return shash_setkey_unaligned(tfm, key, keylen);
60
61 return shash->setkey(tfm, key, keylen);
62}
63EXPORT_SYMBOL_GPL(crypto_shash_setkey);
64
65static inline unsigned int shash_align_buffer_size(unsigned len,
66 unsigned long mask)
67{
68 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
69}
70
71static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
72 unsigned int len)
73{
74 struct crypto_shash *tfm = desc->tfm;
75 struct shash_alg *shash = crypto_shash_alg(tfm);
76 unsigned long alignmask = crypto_shash_alignmask(tfm);
77 unsigned int unaligned_len = alignmask + 1 -
78 ((unsigned long)data & alignmask);
79 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
80 __attribute__ ((aligned));
81 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
82 int err;
83
84 if (unaligned_len > len)
85 unaligned_len = len;
86
87 memcpy(buf, data, unaligned_len);
88 err = shash->update(desc, buf, unaligned_len);
89 memset(buf, 0, unaligned_len);
90
91 return err ?:
92 shash->update(desc, data + unaligned_len, len - unaligned_len);
93}
94
95int crypto_shash_update(struct shash_desc *desc, const u8 *data,
96 unsigned int len)
97{
98 struct crypto_shash *tfm = desc->tfm;
99 struct shash_alg *shash = crypto_shash_alg(tfm);
100 unsigned long alignmask = crypto_shash_alignmask(tfm);
101
102 if ((unsigned long)data & alignmask)
103 return shash_update_unaligned(desc, data, len);
104
105 return shash->update(desc, data, len);
106}
107EXPORT_SYMBOL_GPL(crypto_shash_update);
108
109static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
110{
111 struct crypto_shash *tfm = desc->tfm;
112 unsigned long alignmask = crypto_shash_alignmask(tfm);
113 struct shash_alg *shash = crypto_shash_alg(tfm);
114 unsigned int ds = crypto_shash_digestsize(tfm);
115 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
116 __attribute__ ((aligned));
117 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
118 int err;
119
120 err = shash->final(desc, buf);
121 if (err)
122 goto out;
123
124 memcpy(out, buf, ds);
125
126out:
127 memset(buf, 0, ds);
128 return err;
129}
130
131int crypto_shash_final(struct shash_desc *desc, u8 *out)
132{
133 struct crypto_shash *tfm = desc->tfm;
134 struct shash_alg *shash = crypto_shash_alg(tfm);
135 unsigned long alignmask = crypto_shash_alignmask(tfm);
136
137 if ((unsigned long)out & alignmask)
138 return shash_final_unaligned(desc, out);
139
140 return shash->final(desc, out);
141}
142EXPORT_SYMBOL_GPL(crypto_shash_final);
143
144static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
145 unsigned int len, u8 *out)
146{
147 return crypto_shash_update(desc, data, len) ?:
148 crypto_shash_final(desc, out);
149}
150
151int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
152 unsigned int len, u8 *out)
153{
154 struct crypto_shash *tfm = desc->tfm;
155 struct shash_alg *shash = crypto_shash_alg(tfm);
156 unsigned long alignmask = crypto_shash_alignmask(tfm);
157
158 if (((unsigned long)data | (unsigned long)out) & alignmask)
159 return shash_finup_unaligned(desc, data, len, out);
160
161 return shash->finup(desc, data, len, out);
162}
163EXPORT_SYMBOL_GPL(crypto_shash_finup);
164
165static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
166 unsigned int len, u8 *out)
167{
168 return crypto_shash_init(desc) ?:
169 crypto_shash_finup(desc, data, len, out);
170}
171
172int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
173 unsigned int len, u8 *out)
174{
175 struct crypto_shash *tfm = desc->tfm;
176 struct shash_alg *shash = crypto_shash_alg(tfm);
177 unsigned long alignmask = crypto_shash_alignmask(tfm);
178
179 if (((unsigned long)data | (unsigned long)out) & alignmask)
180 return shash_digest_unaligned(desc, data, len, out);
181
182 return shash->digest(desc, data, len, out);
183}
184EXPORT_SYMBOL_GPL(crypto_shash_digest);
185
186static int shash_default_export(struct shash_desc *desc, void *out)
187{
188 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
189 return 0;
190}
191
192static int shash_default_import(struct shash_desc *desc, const void *in)
193{
194 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
195 return 0;
196}
197
198static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
199 unsigned int keylen)
200{
201 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
202
203 return crypto_shash_setkey(*ctx, key, keylen);
204}
205
206static int shash_async_init(struct ahash_request *req)
207{
208 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
209 struct shash_desc *desc = ahash_request_ctx(req);
210
211 desc->tfm = *ctx;
212 desc->flags = req->base.flags;
213
214 return crypto_shash_init(desc);
215}
216
217int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
218{
219 struct crypto_hash_walk walk;
220 int nbytes;
221
222 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
223 nbytes = crypto_hash_walk_done(&walk, nbytes))
224 nbytes = crypto_shash_update(desc, walk.data, nbytes);
225
226 return nbytes;
227}
228EXPORT_SYMBOL_GPL(shash_ahash_update);
229
230static int shash_async_update(struct ahash_request *req)
231{
232 return shash_ahash_update(req, ahash_request_ctx(req));
233}
234
235static int shash_async_final(struct ahash_request *req)
236{
237 return crypto_shash_final(ahash_request_ctx(req), req->result);
238}
239
240int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
241{
242 struct crypto_hash_walk walk;
243 int nbytes;
244
245 nbytes = crypto_hash_walk_first(req, &walk);
246 if (!nbytes)
247 return crypto_shash_final(desc, req->result);
248
249 do {
250 nbytes = crypto_hash_walk_last(&walk) ?
251 crypto_shash_finup(desc, walk.data, nbytes,
252 req->result) :
253 crypto_shash_update(desc, walk.data, nbytes);
254 nbytes = crypto_hash_walk_done(&walk, nbytes);
255 } while (nbytes > 0);
256
257 return nbytes;
258}
259EXPORT_SYMBOL_GPL(shash_ahash_finup);
260
261static int shash_async_finup(struct ahash_request *req)
262{
263 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
264 struct shash_desc *desc = ahash_request_ctx(req);
265
266 desc->tfm = *ctx;
267 desc->flags = req->base.flags;
268
269 return shash_ahash_finup(req, desc);
270}
271
272int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
273{
274 struct scatterlist *sg = req->src;
275 unsigned int offset = sg->offset;
276 unsigned int nbytes = req->nbytes;
277 int err;
278
279 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
280 void *data;
281
282 data = crypto_kmap(sg_page(sg), 0);
283 err = crypto_shash_digest(desc, data + offset, nbytes,
284 req->result);
285 crypto_kunmap(data, 0);
286 crypto_yield(desc->flags);
287 } else
288 err = crypto_shash_init(desc) ?:
289 shash_ahash_finup(req, desc);
290
291 return err;
292}
293EXPORT_SYMBOL_GPL(shash_ahash_digest);
294
295static int shash_async_digest(struct ahash_request *req)
296{
297 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
298 struct shash_desc *desc = ahash_request_ctx(req);
299
300 desc->tfm = *ctx;
301 desc->flags = req->base.flags;
302
303 return shash_ahash_digest(req, desc);
304}
305
306static int shash_async_export(struct ahash_request *req, void *out)
307{
308 return crypto_shash_export(ahash_request_ctx(req), out);
309}
310
311static int shash_async_import(struct ahash_request *req, const void *in)
312{
313 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
314 struct shash_desc *desc = ahash_request_ctx(req);
315
316 desc->tfm = *ctx;
317 desc->flags = req->base.flags;
318
319 return crypto_shash_import(desc, in);
320}
321
322static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
323{
324 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
325
326 crypto_free_shash(*ctx);
327}
328
329int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
330{
331 struct crypto_alg *calg = tfm->__crt_alg;
332 struct shash_alg *alg = __crypto_shash_alg(calg);
333 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
334 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
335 struct crypto_shash *shash;
336
337 if (!crypto_mod_get(calg))
338 return -EAGAIN;
339
340 shash = crypto_create_tfm(calg, &crypto_shash_type);
341 if (IS_ERR(shash)) {
342 crypto_mod_put(calg);
343 return PTR_ERR(shash);
344 }
345
346 *ctx = shash;
347 tfm->exit = crypto_exit_shash_ops_async;
348
349 crt->init = shash_async_init;
350 crt->update = shash_async_update;
351 crt->final = shash_async_final;
352 crt->finup = shash_async_finup;
353 crt->digest = shash_async_digest;
354
355 if (alg->setkey)
356 crt->setkey = shash_async_setkey;
357 if (alg->export)
358 crt->export = shash_async_export;
359 if (alg->import)
360 crt->import = shash_async_import;
361
362 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
363
364 return 0;
365}
366
367static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
368 unsigned int keylen)
369{
370 struct shash_desc **descp = crypto_hash_ctx(tfm);
371 struct shash_desc *desc = *descp;
372
373 return crypto_shash_setkey(desc->tfm, key, keylen);
374}
375
376static int shash_compat_init(struct hash_desc *hdesc)
377{
378 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
379 struct shash_desc *desc = *descp;
380
381 desc->flags = hdesc->flags;
382
383 return crypto_shash_init(desc);
384}
385
386static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
387 unsigned int len)
388{
389 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
390 struct shash_desc *desc = *descp;
391 struct crypto_hash_walk walk;
392 int nbytes;
393
394 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
395 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
396 nbytes = crypto_shash_update(desc, walk.data, nbytes);
397
398 return nbytes;
399}
400
401static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
402{
403 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
404
405 return crypto_shash_final(*descp, out);
406}
407
408static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
409 unsigned int nbytes, u8 *out)
410{
411 unsigned int offset = sg->offset;
412 int err;
413
414 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
415 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
416 struct shash_desc *desc = *descp;
417 void *data;
418
419 desc->flags = hdesc->flags;
420
421 data = crypto_kmap(sg_page(sg), 0);
422 err = crypto_shash_digest(desc, data + offset, nbytes, out);
423 crypto_kunmap(data, 0);
424 crypto_yield(desc->flags);
425 goto out;
426 }
427
428 err = shash_compat_init(hdesc);
429 if (err)
430 goto out;
431
432 err = shash_compat_update(hdesc, sg, nbytes);
433 if (err)
434 goto out;
435
436 err = shash_compat_final(hdesc, out);
437
438out:
439 return err;
440}
441
442static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
443{
444 struct shash_desc **descp = crypto_tfm_ctx(tfm);
445 struct shash_desc *desc = *descp;
446
447 crypto_free_shash(desc->tfm);
448 kzfree(desc);
449}
450
451static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
452{
453 struct hash_tfm *crt = &tfm->crt_hash;
454 struct crypto_alg *calg = tfm->__crt_alg;
455 struct shash_alg *alg = __crypto_shash_alg(calg);
456 struct shash_desc **descp = crypto_tfm_ctx(tfm);
457 struct crypto_shash *shash;
458 struct shash_desc *desc;
459
460 if (!crypto_mod_get(calg))
461 return -EAGAIN;
462
463 shash = crypto_create_tfm(calg, &crypto_shash_type);
464 if (IS_ERR(shash)) {
465 crypto_mod_put(calg);
466 return PTR_ERR(shash);
467 }
468
469 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
470 GFP_KERNEL);
471 if (!desc) {
472 crypto_free_shash(shash);
473 return -ENOMEM;
474 }
475
476 *descp = desc;
477 desc->tfm = shash;
478 tfm->exit = crypto_exit_shash_ops_compat;
479
480 crt->init = shash_compat_init;
481 crt->update = shash_compat_update;
482 crt->final = shash_compat_final;
483 crt->digest = shash_compat_digest;
484 crt->setkey = shash_compat_setkey;
485
486 crt->digestsize = alg->digestsize;
487
488 return 0;
489}
490
491static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
492{
493 switch (mask & CRYPTO_ALG_TYPE_MASK) {
494 case CRYPTO_ALG_TYPE_HASH_MASK:
495 return crypto_init_shash_ops_compat(tfm);
496 }
497
498 return -EINVAL;
499}
500
501static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
502 u32 mask)
503{
504 switch (mask & CRYPTO_ALG_TYPE_MASK) {
505 case CRYPTO_ALG_TYPE_HASH_MASK:
506 return sizeof(struct shash_desc *);
507 }
508
509 return 0;
510}
511
512static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
513{
514 struct crypto_shash *hash = __crypto_shash_cast(tfm);
515
516 hash->descsize = crypto_shash_alg(hash)->descsize;
517 return 0;
518}
519
520static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
521{
522 return alg->cra_ctxsize;
523}
524
525static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
526 __attribute__ ((unused));
527static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
528{
529 struct shash_alg *salg = __crypto_shash_alg(alg);
530
531 seq_printf(m, "type : shash\n");
532 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
533 seq_printf(m, "digestsize : %u\n", salg->digestsize);
534}
535
536static const struct crypto_type crypto_shash_type = {
537 .ctxsize = crypto_shash_ctxsize,
538 .extsize = crypto_shash_extsize,
539 .init = crypto_init_shash_ops,
540 .init_tfm = crypto_shash_init_tfm,
541#ifdef CONFIG_PROC_FS
542 .show = crypto_shash_show,
543#endif
544 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
545 .maskset = CRYPTO_ALG_TYPE_MASK,
546 .type = CRYPTO_ALG_TYPE_SHASH,
547 .tfmsize = offsetof(struct crypto_shash, base),
548};
549
550struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
551 u32 mask)
552{
553 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
554}
555EXPORT_SYMBOL_GPL(crypto_alloc_shash);
556
557static int shash_prepare_alg(struct shash_alg *alg)
558{
559 struct crypto_alg *base = &alg->base;
560
561 if (alg->digestsize > PAGE_SIZE / 8 ||
562 alg->descsize > PAGE_SIZE / 8 ||
563 alg->statesize > PAGE_SIZE / 8)
564 return -EINVAL;
565
566 base->cra_type = &crypto_shash_type;
567 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
568 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
569
570 if (!alg->finup)
571 alg->finup = shash_finup_unaligned;
572 if (!alg->digest)
573 alg->digest = shash_digest_unaligned;
574 if (!alg->export) {
575 alg->export = shash_default_export;
576 alg->import = shash_default_import;
577 alg->statesize = alg->descsize;
578 }
579 if (!alg->setkey)
580 alg->setkey = shash_no_setkey;
581
582 return 0;
583}
584
585int crypto_register_shash(struct shash_alg *alg)
586{
587 struct crypto_alg *base = &alg->base;
588 int err;
589
590 err = shash_prepare_alg(alg);
591 if (err)
592 return err;
593
594 return crypto_register_alg(base);
595}
596EXPORT_SYMBOL_GPL(crypto_register_shash);
597
598int crypto_unregister_shash(struct shash_alg *alg)
599{
600 return crypto_unregister_alg(&alg->base);
601}
602EXPORT_SYMBOL_GPL(crypto_unregister_shash);
603
604int shash_register_instance(struct crypto_template *tmpl,
605 struct shash_instance *inst)
606{
607 int err;
608
609 err = shash_prepare_alg(&inst->alg);
610 if (err)
611 return err;
612
613 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
614}
615EXPORT_SYMBOL_GPL(shash_register_instance);
616
617void shash_free_instance(struct crypto_instance *inst)
618{
619 crypto_drop_spawn(crypto_instance_ctx(inst));
620 kfree(shash_instance(inst));
621}
622EXPORT_SYMBOL_GPL(shash_free_instance);
623
624int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
625 struct shash_alg *alg,
626 struct crypto_instance *inst)
627{
628 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
629 &crypto_shash_type);
630}
631EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
632
633struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
634{
635 struct crypto_alg *alg;
636
637 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
638 return IS_ERR(alg) ? ERR_CAST(alg) :
639 container_of(alg, struct shash_alg, base);
640}
641EXPORT_SYMBOL_GPL(shash_attr_alg);
642
643MODULE_LICENSE("GPL");
644MODULE_DESCRIPTION("Synchronous cryptographic hash type");