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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Synchronous Cryptographic Hash operations.
4 *
5 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/scatterwalk.h>
9#include <crypto/internal/hash.h>
10#include <linux/err.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/seq_file.h>
15#include <linux/cryptouser.h>
16#include <net/netlink.h>
17#include <linux/compiler.h>
18
19#include "internal.h"
20
21static const struct crypto_type crypto_shash_type;
22
23int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
24 unsigned int keylen)
25{
26 return -ENOSYS;
27}
28EXPORT_SYMBOL_GPL(shash_no_setkey);
29
30static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
31 unsigned int keylen)
32{
33 struct shash_alg *shash = crypto_shash_alg(tfm);
34 unsigned long alignmask = crypto_shash_alignmask(tfm);
35 unsigned long absize;
36 u8 *buffer, *alignbuffer;
37 int err;
38
39 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
40 buffer = kmalloc(absize, GFP_ATOMIC);
41 if (!buffer)
42 return -ENOMEM;
43
44 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
45 memcpy(alignbuffer, key, keylen);
46 err = shash->setkey(tfm, alignbuffer, keylen);
47 kfree_sensitive(buffer);
48 return err;
49}
50
51static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
52{
53 if (crypto_shash_alg_needs_key(alg))
54 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
55}
56
57int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
58 unsigned int keylen)
59{
60 struct shash_alg *shash = crypto_shash_alg(tfm);
61 unsigned long alignmask = crypto_shash_alignmask(tfm);
62 int err;
63
64 if ((unsigned long)key & alignmask)
65 err = shash_setkey_unaligned(tfm, key, keylen);
66 else
67 err = shash->setkey(tfm, key, keylen);
68
69 if (unlikely(err)) {
70 shash_set_needkey(tfm, shash);
71 return err;
72 }
73
74 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
75 return 0;
76}
77EXPORT_SYMBOL_GPL(crypto_shash_setkey);
78
79static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
80 unsigned int len)
81{
82 struct crypto_shash *tfm = desc->tfm;
83 struct shash_alg *shash = crypto_shash_alg(tfm);
84 unsigned long alignmask = crypto_shash_alignmask(tfm);
85 unsigned int unaligned_len = alignmask + 1 -
86 ((unsigned long)data & alignmask);
87 /*
88 * We cannot count on __aligned() working for large values:
89 * https://patchwork.kernel.org/patch/9507697/
90 */
91 u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
92 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
93 int err;
94
95 if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
96 return -EINVAL;
97
98 if (unaligned_len > len)
99 unaligned_len = len;
100
101 memcpy(buf, data, unaligned_len);
102 err = shash->update(desc, buf, unaligned_len);
103 memset(buf, 0, unaligned_len);
104
105 return err ?:
106 shash->update(desc, data + unaligned_len, len - unaligned_len);
107}
108
109int crypto_shash_update(struct shash_desc *desc, const u8 *data,
110 unsigned int len)
111{
112 struct crypto_shash *tfm = desc->tfm;
113 struct shash_alg *shash = crypto_shash_alg(tfm);
114 unsigned long alignmask = crypto_shash_alignmask(tfm);
115
116 if ((unsigned long)data & alignmask)
117 return shash_update_unaligned(desc, data, len);
118
119 return shash->update(desc, data, len);
120}
121EXPORT_SYMBOL_GPL(crypto_shash_update);
122
123static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
124{
125 struct crypto_shash *tfm = desc->tfm;
126 unsigned long alignmask = crypto_shash_alignmask(tfm);
127 struct shash_alg *shash = crypto_shash_alg(tfm);
128 unsigned int ds = crypto_shash_digestsize(tfm);
129 /*
130 * We cannot count on __aligned() working for large values:
131 * https://patchwork.kernel.org/patch/9507697/
132 */
133 u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
134 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
135 int err;
136
137 if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
138 return -EINVAL;
139
140 err = shash->final(desc, buf);
141 if (err)
142 goto out;
143
144 memcpy(out, buf, ds);
145
146out:
147 memset(buf, 0, ds);
148 return err;
149}
150
151int crypto_shash_final(struct shash_desc *desc, u8 *out)
152{
153 struct crypto_shash *tfm = desc->tfm;
154 struct shash_alg *shash = crypto_shash_alg(tfm);
155 unsigned long alignmask = crypto_shash_alignmask(tfm);
156
157 if ((unsigned long)out & alignmask)
158 return shash_final_unaligned(desc, out);
159
160 return shash->final(desc, out);
161}
162EXPORT_SYMBOL_GPL(crypto_shash_final);
163
164static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
165 unsigned int len, u8 *out)
166{
167 return crypto_shash_update(desc, data, len) ?:
168 crypto_shash_final(desc, out);
169}
170
171int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
172 unsigned int len, u8 *out)
173{
174 struct crypto_shash *tfm = desc->tfm;
175 struct shash_alg *shash = crypto_shash_alg(tfm);
176 unsigned long alignmask = crypto_shash_alignmask(tfm);
177
178 if (((unsigned long)data | (unsigned long)out) & alignmask)
179 return shash_finup_unaligned(desc, data, len, out);
180
181 return shash->finup(desc, data, len, out);
182}
183EXPORT_SYMBOL_GPL(crypto_shash_finup);
184
185static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
186 unsigned int len, u8 *out)
187{
188 return crypto_shash_init(desc) ?:
189 crypto_shash_finup(desc, data, len, out);
190}
191
192int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
193 unsigned int len, u8 *out)
194{
195 struct crypto_shash *tfm = desc->tfm;
196 struct shash_alg *shash = crypto_shash_alg(tfm);
197 unsigned long alignmask = crypto_shash_alignmask(tfm);
198
199 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
200 return -ENOKEY;
201
202 if (((unsigned long)data | (unsigned long)out) & alignmask)
203 return shash_digest_unaligned(desc, data, len, out);
204
205 return shash->digest(desc, data, len, out);
206}
207EXPORT_SYMBOL_GPL(crypto_shash_digest);
208
209int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
210 unsigned int len, u8 *out)
211{
212 SHASH_DESC_ON_STACK(desc, tfm);
213 int err;
214
215 desc->tfm = tfm;
216
217 err = crypto_shash_digest(desc, data, len, out);
218
219 shash_desc_zero(desc);
220
221 return err;
222}
223EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
224
225static int shash_default_export(struct shash_desc *desc, void *out)
226{
227 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
228 return 0;
229}
230
231static int shash_default_import(struct shash_desc *desc, const void *in)
232{
233 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
234 return 0;
235}
236
237static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
238 unsigned int keylen)
239{
240 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
241
242 return crypto_shash_setkey(*ctx, key, keylen);
243}
244
245static int shash_async_init(struct ahash_request *req)
246{
247 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
248 struct shash_desc *desc = ahash_request_ctx(req);
249
250 desc->tfm = *ctx;
251
252 return crypto_shash_init(desc);
253}
254
255int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
256{
257 struct crypto_hash_walk walk;
258 int nbytes;
259
260 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
261 nbytes = crypto_hash_walk_done(&walk, nbytes))
262 nbytes = crypto_shash_update(desc, walk.data, nbytes);
263
264 return nbytes;
265}
266EXPORT_SYMBOL_GPL(shash_ahash_update);
267
268static int shash_async_update(struct ahash_request *req)
269{
270 return shash_ahash_update(req, ahash_request_ctx(req));
271}
272
273static int shash_async_final(struct ahash_request *req)
274{
275 return crypto_shash_final(ahash_request_ctx(req), req->result);
276}
277
278int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
279{
280 struct crypto_hash_walk walk;
281 int nbytes;
282
283 nbytes = crypto_hash_walk_first(req, &walk);
284 if (!nbytes)
285 return crypto_shash_final(desc, req->result);
286
287 do {
288 nbytes = crypto_hash_walk_last(&walk) ?
289 crypto_shash_finup(desc, walk.data, nbytes,
290 req->result) :
291 crypto_shash_update(desc, walk.data, nbytes);
292 nbytes = crypto_hash_walk_done(&walk, nbytes);
293 } while (nbytes > 0);
294
295 return nbytes;
296}
297EXPORT_SYMBOL_GPL(shash_ahash_finup);
298
299static int shash_async_finup(struct ahash_request *req)
300{
301 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
302 struct shash_desc *desc = ahash_request_ctx(req);
303
304 desc->tfm = *ctx;
305
306 return shash_ahash_finup(req, desc);
307}
308
309int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
310{
311 unsigned int nbytes = req->nbytes;
312 struct scatterlist *sg;
313 unsigned int offset;
314 int err;
315
316 if (nbytes &&
317 (sg = req->src, offset = sg->offset,
318 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
319 void *data;
320
321 data = kmap_atomic(sg_page(sg));
322 err = crypto_shash_digest(desc, data + offset, nbytes,
323 req->result);
324 kunmap_atomic(data);
325 } else
326 err = crypto_shash_init(desc) ?:
327 shash_ahash_finup(req, desc);
328
329 return err;
330}
331EXPORT_SYMBOL_GPL(shash_ahash_digest);
332
333static int shash_async_digest(struct ahash_request *req)
334{
335 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
336 struct shash_desc *desc = ahash_request_ctx(req);
337
338 desc->tfm = *ctx;
339
340 return shash_ahash_digest(req, desc);
341}
342
343static int shash_async_export(struct ahash_request *req, void *out)
344{
345 return crypto_shash_export(ahash_request_ctx(req), out);
346}
347
348static int shash_async_import(struct ahash_request *req, const void *in)
349{
350 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
351 struct shash_desc *desc = ahash_request_ctx(req);
352
353 desc->tfm = *ctx;
354
355 return crypto_shash_import(desc, in);
356}
357
358static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
359{
360 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
361
362 crypto_free_shash(*ctx);
363}
364
365int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
366{
367 struct crypto_alg *calg = tfm->__crt_alg;
368 struct shash_alg *alg = __crypto_shash_alg(calg);
369 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
370 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
371 struct crypto_shash *shash;
372
373 if (!crypto_mod_get(calg))
374 return -EAGAIN;
375
376 shash = crypto_create_tfm(calg, &crypto_shash_type);
377 if (IS_ERR(shash)) {
378 crypto_mod_put(calg);
379 return PTR_ERR(shash);
380 }
381
382 *ctx = shash;
383 tfm->exit = crypto_exit_shash_ops_async;
384
385 crt->init = shash_async_init;
386 crt->update = shash_async_update;
387 crt->final = shash_async_final;
388 crt->finup = shash_async_finup;
389 crt->digest = shash_async_digest;
390 if (crypto_shash_alg_has_setkey(alg))
391 crt->setkey = shash_async_setkey;
392
393 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
394 CRYPTO_TFM_NEED_KEY);
395
396 crt->export = shash_async_export;
397 crt->import = shash_async_import;
398
399 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
400
401 return 0;
402}
403
404static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
405{
406 struct crypto_shash *hash = __crypto_shash_cast(tfm);
407 struct shash_alg *alg = crypto_shash_alg(hash);
408
409 alg->exit_tfm(hash);
410}
411
412static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
413{
414 struct crypto_shash *hash = __crypto_shash_cast(tfm);
415 struct shash_alg *alg = crypto_shash_alg(hash);
416 int err;
417
418 hash->descsize = alg->descsize;
419
420 shash_set_needkey(hash, alg);
421
422 if (alg->exit_tfm)
423 tfm->exit = crypto_shash_exit_tfm;
424
425 if (!alg->init_tfm)
426 return 0;
427
428 err = alg->init_tfm(hash);
429 if (err)
430 return err;
431
432 /* ->init_tfm() may have increased the descsize. */
433 if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
434 if (alg->exit_tfm)
435 alg->exit_tfm(hash);
436 return -EINVAL;
437 }
438
439 return 0;
440}
441
442static void crypto_shash_free_instance(struct crypto_instance *inst)
443{
444 struct shash_instance *shash = shash_instance(inst);
445
446 shash->free(shash);
447}
448
449#ifdef CONFIG_NET
450static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
451{
452 struct crypto_report_hash rhash;
453 struct shash_alg *salg = __crypto_shash_alg(alg);
454
455 memset(&rhash, 0, sizeof(rhash));
456
457 strscpy(rhash.type, "shash", sizeof(rhash.type));
458
459 rhash.blocksize = alg->cra_blocksize;
460 rhash.digestsize = salg->digestsize;
461
462 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
463}
464#else
465static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
466{
467 return -ENOSYS;
468}
469#endif
470
471static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
472 __maybe_unused;
473static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
474{
475 struct shash_alg *salg = __crypto_shash_alg(alg);
476
477 seq_printf(m, "type : shash\n");
478 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
479 seq_printf(m, "digestsize : %u\n", salg->digestsize);
480}
481
482static const struct crypto_type crypto_shash_type = {
483 .extsize = crypto_alg_extsize,
484 .init_tfm = crypto_shash_init_tfm,
485 .free = crypto_shash_free_instance,
486#ifdef CONFIG_PROC_FS
487 .show = crypto_shash_show,
488#endif
489 .report = crypto_shash_report,
490 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
491 .maskset = CRYPTO_ALG_TYPE_MASK,
492 .type = CRYPTO_ALG_TYPE_SHASH,
493 .tfmsize = offsetof(struct crypto_shash, base),
494};
495
496int crypto_grab_shash(struct crypto_shash_spawn *spawn,
497 struct crypto_instance *inst,
498 const char *name, u32 type, u32 mask)
499{
500 spawn->base.frontend = &crypto_shash_type;
501 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
502}
503EXPORT_SYMBOL_GPL(crypto_grab_shash);
504
505struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
506 u32 mask)
507{
508 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
509}
510EXPORT_SYMBOL_GPL(crypto_alloc_shash);
511
512static int shash_prepare_alg(struct shash_alg *alg)
513{
514 struct crypto_alg *base = &alg->base;
515
516 if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
517 alg->descsize > HASH_MAX_DESCSIZE ||
518 alg->statesize > HASH_MAX_STATESIZE)
519 return -EINVAL;
520
521 if ((alg->export && !alg->import) || (alg->import && !alg->export))
522 return -EINVAL;
523
524 base->cra_type = &crypto_shash_type;
525 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
526 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
527
528 if (!alg->finup)
529 alg->finup = shash_finup_unaligned;
530 if (!alg->digest)
531 alg->digest = shash_digest_unaligned;
532 if (!alg->export) {
533 alg->export = shash_default_export;
534 alg->import = shash_default_import;
535 alg->statesize = alg->descsize;
536 }
537 if (!alg->setkey)
538 alg->setkey = shash_no_setkey;
539
540 return 0;
541}
542
543int crypto_register_shash(struct shash_alg *alg)
544{
545 struct crypto_alg *base = &alg->base;
546 int err;
547
548 err = shash_prepare_alg(alg);
549 if (err)
550 return err;
551
552 return crypto_register_alg(base);
553}
554EXPORT_SYMBOL_GPL(crypto_register_shash);
555
556void crypto_unregister_shash(struct shash_alg *alg)
557{
558 crypto_unregister_alg(&alg->base);
559}
560EXPORT_SYMBOL_GPL(crypto_unregister_shash);
561
562int crypto_register_shashes(struct shash_alg *algs, int count)
563{
564 int i, ret;
565
566 for (i = 0; i < count; i++) {
567 ret = crypto_register_shash(&algs[i]);
568 if (ret)
569 goto err;
570 }
571
572 return 0;
573
574err:
575 for (--i; i >= 0; --i)
576 crypto_unregister_shash(&algs[i]);
577
578 return ret;
579}
580EXPORT_SYMBOL_GPL(crypto_register_shashes);
581
582void crypto_unregister_shashes(struct shash_alg *algs, int count)
583{
584 int i;
585
586 for (i = count - 1; i >= 0; --i)
587 crypto_unregister_shash(&algs[i]);
588}
589EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
590
591int shash_register_instance(struct crypto_template *tmpl,
592 struct shash_instance *inst)
593{
594 int err;
595
596 if (WARN_ON(!inst->free))
597 return -EINVAL;
598
599 err = shash_prepare_alg(&inst->alg);
600 if (err)
601 return err;
602
603 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
604}
605EXPORT_SYMBOL_GPL(shash_register_instance);
606
607void shash_free_singlespawn_instance(struct shash_instance *inst)
608{
609 crypto_drop_spawn(shash_instance_ctx(inst));
610 kfree(inst);
611}
612EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
613
614MODULE_LICENSE("GPL");
615MODULE_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#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");