Loading...
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
21#define MAX_SHASH_ALIGNMASK 63
22
23static const struct crypto_type crypto_shash_type;
24
25int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
26 unsigned int keylen)
27{
28 return -ENOSYS;
29}
30EXPORT_SYMBOL_GPL(shash_no_setkey);
31
32static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
33 unsigned int keylen)
34{
35 struct shash_alg *shash = crypto_shash_alg(tfm);
36 unsigned long alignmask = crypto_shash_alignmask(tfm);
37 unsigned long absize;
38 u8 *buffer, *alignbuffer;
39 int err;
40
41 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
42 buffer = kmalloc(absize, GFP_ATOMIC);
43 if (!buffer)
44 return -ENOMEM;
45
46 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
47 memcpy(alignbuffer, key, keylen);
48 err = shash->setkey(tfm, alignbuffer, keylen);
49 kfree_sensitive(buffer);
50 return err;
51}
52
53static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
54{
55 if (crypto_shash_alg_needs_key(alg))
56 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
57}
58
59int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
60 unsigned int keylen)
61{
62 struct shash_alg *shash = crypto_shash_alg(tfm);
63 unsigned long alignmask = crypto_shash_alignmask(tfm);
64 int err;
65
66 if ((unsigned long)key & alignmask)
67 err = shash_setkey_unaligned(tfm, key, keylen);
68 else
69 err = shash->setkey(tfm, key, keylen);
70
71 if (unlikely(err)) {
72 shash_set_needkey(tfm, shash);
73 return err;
74 }
75
76 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
77 return 0;
78}
79EXPORT_SYMBOL_GPL(crypto_shash_setkey);
80
81static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
82 unsigned int len)
83{
84 struct crypto_shash *tfm = desc->tfm;
85 struct shash_alg *shash = crypto_shash_alg(tfm);
86 unsigned long alignmask = crypto_shash_alignmask(tfm);
87 unsigned int unaligned_len = alignmask + 1 -
88 ((unsigned long)data & alignmask);
89 /*
90 * We cannot count on __aligned() working for large values:
91 * https://patchwork.kernel.org/patch/9507697/
92 */
93 u8 ubuf[MAX_SHASH_ALIGNMASK * 2];
94 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
95 int err;
96
97 if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
98 return -EINVAL;
99
100 if (unaligned_len > len)
101 unaligned_len = len;
102
103 memcpy(buf, data, unaligned_len);
104 err = shash->update(desc, buf, unaligned_len);
105 memset(buf, 0, unaligned_len);
106
107 return err ?:
108 shash->update(desc, data + unaligned_len, len - unaligned_len);
109}
110
111int crypto_shash_update(struct shash_desc *desc, const u8 *data,
112 unsigned int len)
113{
114 struct crypto_shash *tfm = desc->tfm;
115 struct shash_alg *shash = crypto_shash_alg(tfm);
116 unsigned long alignmask = crypto_shash_alignmask(tfm);
117
118 if ((unsigned long)data & alignmask)
119 return shash_update_unaligned(desc, data, len);
120
121 return shash->update(desc, data, len);
122}
123EXPORT_SYMBOL_GPL(crypto_shash_update);
124
125static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
126{
127 struct crypto_shash *tfm = desc->tfm;
128 unsigned long alignmask = crypto_shash_alignmask(tfm);
129 struct shash_alg *shash = crypto_shash_alg(tfm);
130 unsigned int ds = crypto_shash_digestsize(tfm);
131 /*
132 * We cannot count on __aligned() working for large values:
133 * https://patchwork.kernel.org/patch/9507697/
134 */
135 u8 ubuf[MAX_SHASH_ALIGNMASK + HASH_MAX_DIGESTSIZE];
136 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
137 int err;
138
139 if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
140 return -EINVAL;
141
142 err = shash->final(desc, buf);
143 if (err)
144 goto out;
145
146 memcpy(out, buf, ds);
147
148out:
149 memset(buf, 0, ds);
150 return err;
151}
152
153int crypto_shash_final(struct shash_desc *desc, u8 *out)
154{
155 struct crypto_shash *tfm = desc->tfm;
156 struct shash_alg *shash = crypto_shash_alg(tfm);
157 unsigned long alignmask = crypto_shash_alignmask(tfm);
158
159 if ((unsigned long)out & alignmask)
160 return shash_final_unaligned(desc, out);
161
162 return shash->final(desc, out);
163}
164EXPORT_SYMBOL_GPL(crypto_shash_final);
165
166static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
167 unsigned int len, u8 *out)
168{
169 return crypto_shash_update(desc, data, len) ?:
170 crypto_shash_final(desc, out);
171}
172
173int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
174 unsigned int len, u8 *out)
175{
176 struct crypto_shash *tfm = desc->tfm;
177 struct shash_alg *shash = crypto_shash_alg(tfm);
178 unsigned long alignmask = crypto_shash_alignmask(tfm);
179
180 if (((unsigned long)data | (unsigned long)out) & alignmask)
181 return shash_finup_unaligned(desc, data, len, out);
182
183 return shash->finup(desc, data, len, out);
184}
185EXPORT_SYMBOL_GPL(crypto_shash_finup);
186
187static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
188 unsigned int len, u8 *out)
189{
190 return crypto_shash_init(desc) ?:
191 crypto_shash_finup(desc, data, len, out);
192}
193
194int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
195 unsigned int len, u8 *out)
196{
197 struct crypto_shash *tfm = desc->tfm;
198 struct shash_alg *shash = crypto_shash_alg(tfm);
199 unsigned long alignmask = crypto_shash_alignmask(tfm);
200
201 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
202 return -ENOKEY;
203
204 if (((unsigned long)data | (unsigned long)out) & alignmask)
205 return shash_digest_unaligned(desc, data, len, out);
206
207 return shash->digest(desc, data, len, out);
208}
209EXPORT_SYMBOL_GPL(crypto_shash_digest);
210
211int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
212 unsigned int len, u8 *out)
213{
214 SHASH_DESC_ON_STACK(desc, tfm);
215 int err;
216
217 desc->tfm = tfm;
218
219 err = crypto_shash_digest(desc, data, len, out);
220
221 shash_desc_zero(desc);
222
223 return err;
224}
225EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
226
227static int shash_default_export(struct shash_desc *desc, void *out)
228{
229 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
230 return 0;
231}
232
233static int shash_default_import(struct shash_desc *desc, const void *in)
234{
235 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
236 return 0;
237}
238
239static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
240 unsigned int keylen)
241{
242 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
243
244 return crypto_shash_setkey(*ctx, key, keylen);
245}
246
247static int shash_async_init(struct ahash_request *req)
248{
249 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
250 struct shash_desc *desc = ahash_request_ctx(req);
251
252 desc->tfm = *ctx;
253
254 return crypto_shash_init(desc);
255}
256
257int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
258{
259 struct crypto_hash_walk walk;
260 int nbytes;
261
262 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
263 nbytes = crypto_hash_walk_done(&walk, nbytes))
264 nbytes = crypto_shash_update(desc, walk.data, nbytes);
265
266 return nbytes;
267}
268EXPORT_SYMBOL_GPL(shash_ahash_update);
269
270static int shash_async_update(struct ahash_request *req)
271{
272 return shash_ahash_update(req, ahash_request_ctx(req));
273}
274
275static int shash_async_final(struct ahash_request *req)
276{
277 return crypto_shash_final(ahash_request_ctx(req), req->result);
278}
279
280int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
281{
282 struct crypto_hash_walk walk;
283 int nbytes;
284
285 nbytes = crypto_hash_walk_first(req, &walk);
286 if (!nbytes)
287 return crypto_shash_final(desc, req->result);
288
289 do {
290 nbytes = crypto_hash_walk_last(&walk) ?
291 crypto_shash_finup(desc, walk.data, nbytes,
292 req->result) :
293 crypto_shash_update(desc, walk.data, nbytes);
294 nbytes = crypto_hash_walk_done(&walk, nbytes);
295 } while (nbytes > 0);
296
297 return nbytes;
298}
299EXPORT_SYMBOL_GPL(shash_ahash_finup);
300
301static int shash_async_finup(struct ahash_request *req)
302{
303 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
304 struct shash_desc *desc = ahash_request_ctx(req);
305
306 desc->tfm = *ctx;
307
308 return shash_ahash_finup(req, desc);
309}
310
311int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
312{
313 unsigned int nbytes = req->nbytes;
314 struct scatterlist *sg;
315 unsigned int offset;
316 int err;
317
318 if (nbytes &&
319 (sg = req->src, offset = sg->offset,
320 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
321 void *data;
322
323 data = kmap_atomic(sg_page(sg));
324 err = crypto_shash_digest(desc, data + offset, nbytes,
325 req->result);
326 kunmap_atomic(data);
327 } else
328 err = crypto_shash_init(desc) ?:
329 shash_ahash_finup(req, desc);
330
331 return err;
332}
333EXPORT_SYMBOL_GPL(shash_ahash_digest);
334
335static int shash_async_digest(struct ahash_request *req)
336{
337 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
338 struct shash_desc *desc = ahash_request_ctx(req);
339
340 desc->tfm = *ctx;
341
342 return shash_ahash_digest(req, desc);
343}
344
345static int shash_async_export(struct ahash_request *req, void *out)
346{
347 return crypto_shash_export(ahash_request_ctx(req), out);
348}
349
350static int shash_async_import(struct ahash_request *req, const void *in)
351{
352 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
353 struct shash_desc *desc = ahash_request_ctx(req);
354
355 desc->tfm = *ctx;
356
357 return crypto_shash_import(desc, in);
358}
359
360static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
361{
362 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
363
364 crypto_free_shash(*ctx);
365}
366
367int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
368{
369 struct crypto_alg *calg = tfm->__crt_alg;
370 struct shash_alg *alg = __crypto_shash_alg(calg);
371 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
372 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
373 struct crypto_shash *shash;
374
375 if (!crypto_mod_get(calg))
376 return -EAGAIN;
377
378 shash = crypto_create_tfm(calg, &crypto_shash_type);
379 if (IS_ERR(shash)) {
380 crypto_mod_put(calg);
381 return PTR_ERR(shash);
382 }
383
384 *ctx = shash;
385 tfm->exit = crypto_exit_shash_ops_async;
386
387 crt->init = shash_async_init;
388 crt->update = shash_async_update;
389 crt->final = shash_async_final;
390 crt->finup = shash_async_finup;
391 crt->digest = shash_async_digest;
392 if (crypto_shash_alg_has_setkey(alg))
393 crt->setkey = shash_async_setkey;
394
395 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
396 CRYPTO_TFM_NEED_KEY);
397
398 crt->export = shash_async_export;
399 crt->import = shash_async_import;
400
401 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
402
403 return 0;
404}
405
406static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
407{
408 struct crypto_shash *hash = __crypto_shash_cast(tfm);
409 struct shash_alg *alg = crypto_shash_alg(hash);
410
411 alg->exit_tfm(hash);
412}
413
414static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
415{
416 struct crypto_shash *hash = __crypto_shash_cast(tfm);
417 struct shash_alg *alg = crypto_shash_alg(hash);
418 int err;
419
420 hash->descsize = alg->descsize;
421
422 shash_set_needkey(hash, alg);
423
424 if (alg->exit_tfm)
425 tfm->exit = crypto_shash_exit_tfm;
426
427 if (!alg->init_tfm)
428 return 0;
429
430 err = alg->init_tfm(hash);
431 if (err)
432 return err;
433
434 /* ->init_tfm() may have increased the descsize. */
435 if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
436 if (alg->exit_tfm)
437 alg->exit_tfm(hash);
438 return -EINVAL;
439 }
440
441 return 0;
442}
443
444static void crypto_shash_free_instance(struct crypto_instance *inst)
445{
446 struct shash_instance *shash = shash_instance(inst);
447
448 shash->free(shash);
449}
450
451#ifdef CONFIG_NET
452static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
453{
454 struct crypto_report_hash rhash;
455 struct shash_alg *salg = __crypto_shash_alg(alg);
456
457 memset(&rhash, 0, sizeof(rhash));
458
459 strscpy(rhash.type, "shash", sizeof(rhash.type));
460
461 rhash.blocksize = alg->cra_blocksize;
462 rhash.digestsize = salg->digestsize;
463
464 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
465}
466#else
467static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
468{
469 return -ENOSYS;
470}
471#endif
472
473static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
474 __maybe_unused;
475static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
476{
477 struct shash_alg *salg = __crypto_shash_alg(alg);
478
479 seq_printf(m, "type : shash\n");
480 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
481 seq_printf(m, "digestsize : %u\n", salg->digestsize);
482}
483
484static const struct crypto_type crypto_shash_type = {
485 .extsize = crypto_alg_extsize,
486 .init_tfm = crypto_shash_init_tfm,
487 .free = crypto_shash_free_instance,
488#ifdef CONFIG_PROC_FS
489 .show = crypto_shash_show,
490#endif
491 .report = crypto_shash_report,
492 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
493 .maskset = CRYPTO_ALG_TYPE_MASK,
494 .type = CRYPTO_ALG_TYPE_SHASH,
495 .tfmsize = offsetof(struct crypto_shash, base),
496};
497
498int crypto_grab_shash(struct crypto_shash_spawn *spawn,
499 struct crypto_instance *inst,
500 const char *name, u32 type, u32 mask)
501{
502 spawn->base.frontend = &crypto_shash_type;
503 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
504}
505EXPORT_SYMBOL_GPL(crypto_grab_shash);
506
507struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
508 u32 mask)
509{
510 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
511}
512EXPORT_SYMBOL_GPL(crypto_alloc_shash);
513
514int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
515{
516 return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
517}
518EXPORT_SYMBOL_GPL(crypto_has_shash);
519
520static int shash_prepare_alg(struct shash_alg *alg)
521{
522 struct crypto_alg *base = &alg->base;
523
524 if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
525 alg->descsize > HASH_MAX_DESCSIZE ||
526 alg->statesize > HASH_MAX_STATESIZE)
527 return -EINVAL;
528
529 if (base->cra_alignmask > MAX_SHASH_ALIGNMASK)
530 return -EINVAL;
531
532 if ((alg->export && !alg->import) || (alg->import && !alg->export))
533 return -EINVAL;
534
535 base->cra_type = &crypto_shash_type;
536 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
537 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
538
539 if (!alg->finup)
540 alg->finup = shash_finup_unaligned;
541 if (!alg->digest)
542 alg->digest = shash_digest_unaligned;
543 if (!alg->export) {
544 alg->export = shash_default_export;
545 alg->import = shash_default_import;
546 alg->statesize = alg->descsize;
547 }
548 if (!alg->setkey)
549 alg->setkey = shash_no_setkey;
550
551 return 0;
552}
553
554int crypto_register_shash(struct shash_alg *alg)
555{
556 struct crypto_alg *base = &alg->base;
557 int err;
558
559 err = shash_prepare_alg(alg);
560 if (err)
561 return err;
562
563 return crypto_register_alg(base);
564}
565EXPORT_SYMBOL_GPL(crypto_register_shash);
566
567void crypto_unregister_shash(struct shash_alg *alg)
568{
569 crypto_unregister_alg(&alg->base);
570}
571EXPORT_SYMBOL_GPL(crypto_unregister_shash);
572
573int crypto_register_shashes(struct shash_alg *algs, int count)
574{
575 int i, ret;
576
577 for (i = 0; i < count; i++) {
578 ret = crypto_register_shash(&algs[i]);
579 if (ret)
580 goto err;
581 }
582
583 return 0;
584
585err:
586 for (--i; i >= 0; --i)
587 crypto_unregister_shash(&algs[i]);
588
589 return ret;
590}
591EXPORT_SYMBOL_GPL(crypto_register_shashes);
592
593void crypto_unregister_shashes(struct shash_alg *algs, int count)
594{
595 int i;
596
597 for (i = count - 1; i >= 0; --i)
598 crypto_unregister_shash(&algs[i]);
599}
600EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
601
602int shash_register_instance(struct crypto_template *tmpl,
603 struct shash_instance *inst)
604{
605 int err;
606
607 if (WARN_ON(!inst->free))
608 return -EINVAL;
609
610 err = shash_prepare_alg(&inst->alg);
611 if (err)
612 return err;
613
614 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
615}
616EXPORT_SYMBOL_GPL(shash_register_instance);
617
618void shash_free_singlespawn_instance(struct shash_instance *inst)
619{
620 crypto_drop_spawn(shash_instance_ctx(inst));
621 kfree(inst);
622}
623EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
624
625MODULE_LICENSE("GPL");
626MODULE_DESCRIPTION("Synchronous cryptographic hash type");
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 kzfree(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_has_setkey(alg) &&
54 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
55 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
56}
57
58int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
59 unsigned int keylen)
60{
61 struct shash_alg *shash = crypto_shash_alg(tfm);
62 unsigned long alignmask = crypto_shash_alignmask(tfm);
63 int err;
64
65 if ((unsigned long)key & alignmask)
66 err = shash_setkey_unaligned(tfm, key, keylen);
67 else
68 err = shash->setkey(tfm, key, keylen);
69
70 if (unlikely(err)) {
71 shash_set_needkey(tfm, shash);
72 return err;
73 }
74
75 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
76 return 0;
77}
78EXPORT_SYMBOL_GPL(crypto_shash_setkey);
79
80static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
81 unsigned int len)
82{
83 struct crypto_shash *tfm = desc->tfm;
84 struct shash_alg *shash = crypto_shash_alg(tfm);
85 unsigned long alignmask = crypto_shash_alignmask(tfm);
86 unsigned int unaligned_len = alignmask + 1 -
87 ((unsigned long)data & alignmask);
88 /*
89 * We cannot count on __aligned() working for large values:
90 * https://patchwork.kernel.org/patch/9507697/
91 */
92 u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
93 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
94 int err;
95
96 if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
97 return -EINVAL;
98
99 if (unaligned_len > len)
100 unaligned_len = len;
101
102 memcpy(buf, data, unaligned_len);
103 err = shash->update(desc, buf, unaligned_len);
104 memset(buf, 0, unaligned_len);
105
106 return err ?:
107 shash->update(desc, data + unaligned_len, len - unaligned_len);
108}
109
110int crypto_shash_update(struct shash_desc *desc, const u8 *data,
111 unsigned int len)
112{
113 struct crypto_shash *tfm = desc->tfm;
114 struct shash_alg *shash = crypto_shash_alg(tfm);
115 unsigned long alignmask = crypto_shash_alignmask(tfm);
116
117 if ((unsigned long)data & alignmask)
118 return shash_update_unaligned(desc, data, len);
119
120 return shash->update(desc, data, len);
121}
122EXPORT_SYMBOL_GPL(crypto_shash_update);
123
124static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
125{
126 struct crypto_shash *tfm = desc->tfm;
127 unsigned long alignmask = crypto_shash_alignmask(tfm);
128 struct shash_alg *shash = crypto_shash_alg(tfm);
129 unsigned int ds = crypto_shash_digestsize(tfm);
130 /*
131 * We cannot count on __aligned() working for large values:
132 * https://patchwork.kernel.org/patch/9507697/
133 */
134 u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
135 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
136 int err;
137
138 if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
139 return -EINVAL;
140
141 err = shash->final(desc, buf);
142 if (err)
143 goto out;
144
145 memcpy(out, buf, ds);
146
147out:
148 memset(buf, 0, ds);
149 return err;
150}
151
152int crypto_shash_final(struct shash_desc *desc, 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)out & alignmask)
159 return shash_final_unaligned(desc, out);
160
161 return shash->final(desc, out);
162}
163EXPORT_SYMBOL_GPL(crypto_shash_final);
164
165static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
166 unsigned int len, u8 *out)
167{
168 return crypto_shash_update(desc, data, len) ?:
169 crypto_shash_final(desc, out);
170}
171
172int crypto_shash_finup(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_finup_unaligned(desc, data, len, out);
181
182 return shash->finup(desc, data, len, out);
183}
184EXPORT_SYMBOL_GPL(crypto_shash_finup);
185
186static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
187 unsigned int len, u8 *out)
188{
189 return crypto_shash_init(desc) ?:
190 crypto_shash_finup(desc, data, len, out);
191}
192
193int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
194 unsigned int len, u8 *out)
195{
196 struct crypto_shash *tfm = desc->tfm;
197 struct shash_alg *shash = crypto_shash_alg(tfm);
198 unsigned long alignmask = crypto_shash_alignmask(tfm);
199
200 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
201 return -ENOKEY;
202
203 if (((unsigned long)data | (unsigned long)out) & alignmask)
204 return shash_digest_unaligned(desc, data, len, out);
205
206 return shash->digest(desc, data, len, out);
207}
208EXPORT_SYMBOL_GPL(crypto_shash_digest);
209
210static int shash_default_export(struct shash_desc *desc, void *out)
211{
212 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
213 return 0;
214}
215
216static int shash_default_import(struct shash_desc *desc, const void *in)
217{
218 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
219 return 0;
220}
221
222static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
223 unsigned int keylen)
224{
225 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
226
227 return crypto_shash_setkey(*ctx, key, keylen);
228}
229
230static int shash_async_init(struct ahash_request *req)
231{
232 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
233 struct shash_desc *desc = ahash_request_ctx(req);
234
235 desc->tfm = *ctx;
236
237 return crypto_shash_init(desc);
238}
239
240int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
241{
242 struct crypto_hash_walk walk;
243 int nbytes;
244
245 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
246 nbytes = crypto_hash_walk_done(&walk, nbytes))
247 nbytes = crypto_shash_update(desc, walk.data, nbytes);
248
249 return nbytes;
250}
251EXPORT_SYMBOL_GPL(shash_ahash_update);
252
253static int shash_async_update(struct ahash_request *req)
254{
255 return shash_ahash_update(req, ahash_request_ctx(req));
256}
257
258static int shash_async_final(struct ahash_request *req)
259{
260 return crypto_shash_final(ahash_request_ctx(req), req->result);
261}
262
263int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
264{
265 struct crypto_hash_walk walk;
266 int nbytes;
267
268 nbytes = crypto_hash_walk_first(req, &walk);
269 if (!nbytes)
270 return crypto_shash_final(desc, req->result);
271
272 do {
273 nbytes = crypto_hash_walk_last(&walk) ?
274 crypto_shash_finup(desc, walk.data, nbytes,
275 req->result) :
276 crypto_shash_update(desc, walk.data, nbytes);
277 nbytes = crypto_hash_walk_done(&walk, nbytes);
278 } while (nbytes > 0);
279
280 return nbytes;
281}
282EXPORT_SYMBOL_GPL(shash_ahash_finup);
283
284static int shash_async_finup(struct ahash_request *req)
285{
286 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
287 struct shash_desc *desc = ahash_request_ctx(req);
288
289 desc->tfm = *ctx;
290
291 return shash_ahash_finup(req, desc);
292}
293
294int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
295{
296 unsigned int nbytes = req->nbytes;
297 struct scatterlist *sg;
298 unsigned int offset;
299 int err;
300
301 if (nbytes &&
302 (sg = req->src, offset = sg->offset,
303 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
304 void *data;
305
306 data = kmap_atomic(sg_page(sg));
307 err = crypto_shash_digest(desc, data + offset, nbytes,
308 req->result);
309 kunmap_atomic(data);
310 } else
311 err = crypto_shash_init(desc) ?:
312 shash_ahash_finup(req, desc);
313
314 return err;
315}
316EXPORT_SYMBOL_GPL(shash_ahash_digest);
317
318static int shash_async_digest(struct ahash_request *req)
319{
320 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
321 struct shash_desc *desc = ahash_request_ctx(req);
322
323 desc->tfm = *ctx;
324
325 return shash_ahash_digest(req, desc);
326}
327
328static int shash_async_export(struct ahash_request *req, void *out)
329{
330 return crypto_shash_export(ahash_request_ctx(req), out);
331}
332
333static int shash_async_import(struct ahash_request *req, const void *in)
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 crypto_shash_import(desc, in);
341}
342
343static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
344{
345 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
346
347 crypto_free_shash(*ctx);
348}
349
350int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
351{
352 struct crypto_alg *calg = tfm->__crt_alg;
353 struct shash_alg *alg = __crypto_shash_alg(calg);
354 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
355 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
356 struct crypto_shash *shash;
357
358 if (!crypto_mod_get(calg))
359 return -EAGAIN;
360
361 shash = crypto_create_tfm(calg, &crypto_shash_type);
362 if (IS_ERR(shash)) {
363 crypto_mod_put(calg);
364 return PTR_ERR(shash);
365 }
366
367 *ctx = shash;
368 tfm->exit = crypto_exit_shash_ops_async;
369
370 crt->init = shash_async_init;
371 crt->update = shash_async_update;
372 crt->final = shash_async_final;
373 crt->finup = shash_async_finup;
374 crt->digest = shash_async_digest;
375 if (crypto_shash_alg_has_setkey(alg))
376 crt->setkey = shash_async_setkey;
377
378 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
379 CRYPTO_TFM_NEED_KEY);
380
381 crt->export = shash_async_export;
382 crt->import = shash_async_import;
383
384 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
385
386 return 0;
387}
388
389static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
390{
391 struct crypto_shash *hash = __crypto_shash_cast(tfm);
392 struct shash_alg *alg = crypto_shash_alg(hash);
393
394 hash->descsize = alg->descsize;
395
396 shash_set_needkey(hash, alg);
397
398 return 0;
399}
400
401#ifdef CONFIG_NET
402static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
403{
404 struct crypto_report_hash rhash;
405 struct shash_alg *salg = __crypto_shash_alg(alg);
406
407 memset(&rhash, 0, sizeof(rhash));
408
409 strscpy(rhash.type, "shash", sizeof(rhash.type));
410
411 rhash.blocksize = alg->cra_blocksize;
412 rhash.digestsize = salg->digestsize;
413
414 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
415}
416#else
417static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
418{
419 return -ENOSYS;
420}
421#endif
422
423static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
424 __maybe_unused;
425static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
426{
427 struct shash_alg *salg = __crypto_shash_alg(alg);
428
429 seq_printf(m, "type : shash\n");
430 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
431 seq_printf(m, "digestsize : %u\n", salg->digestsize);
432}
433
434static const struct crypto_type crypto_shash_type = {
435 .extsize = crypto_alg_extsize,
436 .init_tfm = crypto_shash_init_tfm,
437#ifdef CONFIG_PROC_FS
438 .show = crypto_shash_show,
439#endif
440 .report = crypto_shash_report,
441 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
442 .maskset = CRYPTO_ALG_TYPE_MASK,
443 .type = CRYPTO_ALG_TYPE_SHASH,
444 .tfmsize = offsetof(struct crypto_shash, base),
445};
446
447struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
448 u32 mask)
449{
450 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
451}
452EXPORT_SYMBOL_GPL(crypto_alloc_shash);
453
454static int shash_prepare_alg(struct shash_alg *alg)
455{
456 struct crypto_alg *base = &alg->base;
457
458 if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
459 alg->descsize > HASH_MAX_DESCSIZE ||
460 alg->statesize > HASH_MAX_STATESIZE)
461 return -EINVAL;
462
463 if ((alg->export && !alg->import) || (alg->import && !alg->export))
464 return -EINVAL;
465
466 base->cra_type = &crypto_shash_type;
467 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
468 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
469
470 if (!alg->finup)
471 alg->finup = shash_finup_unaligned;
472 if (!alg->digest)
473 alg->digest = shash_digest_unaligned;
474 if (!alg->export) {
475 alg->export = shash_default_export;
476 alg->import = shash_default_import;
477 alg->statesize = alg->descsize;
478 }
479 if (!alg->setkey)
480 alg->setkey = shash_no_setkey;
481
482 return 0;
483}
484
485int crypto_register_shash(struct shash_alg *alg)
486{
487 struct crypto_alg *base = &alg->base;
488 int err;
489
490 err = shash_prepare_alg(alg);
491 if (err)
492 return err;
493
494 return crypto_register_alg(base);
495}
496EXPORT_SYMBOL_GPL(crypto_register_shash);
497
498int crypto_unregister_shash(struct shash_alg *alg)
499{
500 return crypto_unregister_alg(&alg->base);
501}
502EXPORT_SYMBOL_GPL(crypto_unregister_shash);
503
504int crypto_register_shashes(struct shash_alg *algs, int count)
505{
506 int i, ret;
507
508 for (i = 0; i < count; i++) {
509 ret = crypto_register_shash(&algs[i]);
510 if (ret)
511 goto err;
512 }
513
514 return 0;
515
516err:
517 for (--i; i >= 0; --i)
518 crypto_unregister_shash(&algs[i]);
519
520 return ret;
521}
522EXPORT_SYMBOL_GPL(crypto_register_shashes);
523
524int crypto_unregister_shashes(struct shash_alg *algs, int count)
525{
526 int i, ret;
527
528 for (i = count - 1; i >= 0; --i) {
529 ret = crypto_unregister_shash(&algs[i]);
530 if (ret)
531 pr_err("Failed to unregister %s %s: %d\n",
532 algs[i].base.cra_driver_name,
533 algs[i].base.cra_name, ret);
534 }
535
536 return 0;
537}
538EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
539
540int shash_register_instance(struct crypto_template *tmpl,
541 struct shash_instance *inst)
542{
543 int err;
544
545 err = shash_prepare_alg(&inst->alg);
546 if (err)
547 return err;
548
549 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
550}
551EXPORT_SYMBOL_GPL(shash_register_instance);
552
553void shash_free_instance(struct crypto_instance *inst)
554{
555 crypto_drop_spawn(crypto_instance_ctx(inst));
556 kfree(shash_instance(inst));
557}
558EXPORT_SYMBOL_GPL(shash_free_instance);
559
560int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
561 struct shash_alg *alg,
562 struct crypto_instance *inst)
563{
564 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
565 &crypto_shash_type);
566}
567EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
568
569struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
570{
571 struct crypto_alg *alg;
572
573 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
574 return IS_ERR(alg) ? ERR_CAST(alg) :
575 container_of(alg, struct shash_alg, base);
576}
577EXPORT_SYMBOL_GPL(shash_attr_alg);
578
579MODULE_LICENSE("GPL");
580MODULE_DESCRIPTION("Synchronous cryptographic hash type");