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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
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 <linux/cryptouser.h>
10#include <linux/err.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/seq_file.h>
14#include <linux/string.h>
15#include <net/netlink.h>
16
17#include "hash.h"
18
19static inline struct crypto_istat_hash *shash_get_stat(struct shash_alg *alg)
20{
21 return hash_get_stat(&alg->halg);
22}
23
24static inline int crypto_shash_errstat(struct shash_alg *alg, int err)
25{
26 if (IS_ENABLED(CONFIG_CRYPTO_STATS) && err)
27 atomic64_inc(&shash_get_stat(alg)->err_cnt);
28 return err;
29}
30
31int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
32 unsigned int keylen)
33{
34 return -ENOSYS;
35}
36EXPORT_SYMBOL_GPL(shash_no_setkey);
37
38static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
39{
40 if (crypto_shash_alg_needs_key(alg))
41 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
42}
43
44int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
45 unsigned int keylen)
46{
47 struct shash_alg *shash = crypto_shash_alg(tfm);
48 int err;
49
50 err = shash->setkey(tfm, key, keylen);
51 if (unlikely(err)) {
52 shash_set_needkey(tfm, shash);
53 return err;
54 }
55
56 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
57 return 0;
58}
59EXPORT_SYMBOL_GPL(crypto_shash_setkey);
60
61int crypto_shash_update(struct shash_desc *desc, const u8 *data,
62 unsigned int len)
63{
64 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
65 int err;
66
67 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
68 atomic64_add(len, &shash_get_stat(shash)->hash_tlen);
69
70 err = shash->update(desc, data, len);
71
72 return crypto_shash_errstat(shash, err);
73}
74EXPORT_SYMBOL_GPL(crypto_shash_update);
75
76int crypto_shash_final(struct shash_desc *desc, u8 *out)
77{
78 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
79 int err;
80
81 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
82 atomic64_inc(&shash_get_stat(shash)->hash_cnt);
83
84 err = shash->final(desc, out);
85
86 return crypto_shash_errstat(shash, err);
87}
88EXPORT_SYMBOL_GPL(crypto_shash_final);
89
90static int shash_default_finup(struct shash_desc *desc, const u8 *data,
91 unsigned int len, u8 *out)
92{
93 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
94
95 return shash->update(desc, data, len) ?:
96 shash->final(desc, out);
97}
98
99int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
100 unsigned int len, u8 *out)
101{
102 struct crypto_shash *tfm = desc->tfm;
103 struct shash_alg *shash = crypto_shash_alg(tfm);
104 int err;
105
106 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
107 struct crypto_istat_hash *istat = shash_get_stat(shash);
108
109 atomic64_inc(&istat->hash_cnt);
110 atomic64_add(len, &istat->hash_tlen);
111 }
112
113 err = shash->finup(desc, data, len, out);
114
115 return crypto_shash_errstat(shash, err);
116}
117EXPORT_SYMBOL_GPL(crypto_shash_finup);
118
119static int shash_default_digest(struct shash_desc *desc, const u8 *data,
120 unsigned int len, u8 *out)
121{
122 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
123
124 return shash->init(desc) ?:
125 shash->finup(desc, data, len, out);
126}
127
128int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
129 unsigned int len, u8 *out)
130{
131 struct crypto_shash *tfm = desc->tfm;
132 struct shash_alg *shash = crypto_shash_alg(tfm);
133 int err;
134
135 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
136 struct crypto_istat_hash *istat = shash_get_stat(shash);
137
138 atomic64_inc(&istat->hash_cnt);
139 atomic64_add(len, &istat->hash_tlen);
140 }
141
142 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
143 err = -ENOKEY;
144 else
145 err = shash->digest(desc, data, len, out);
146
147 return crypto_shash_errstat(shash, err);
148}
149EXPORT_SYMBOL_GPL(crypto_shash_digest);
150
151int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
152 unsigned int len, u8 *out)
153{
154 SHASH_DESC_ON_STACK(desc, tfm);
155 int err;
156
157 desc->tfm = tfm;
158
159 err = crypto_shash_digest(desc, data, len, out);
160
161 shash_desc_zero(desc);
162
163 return err;
164}
165EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
166
167int crypto_shash_export(struct shash_desc *desc, void *out)
168{
169 struct crypto_shash *tfm = desc->tfm;
170 struct shash_alg *shash = crypto_shash_alg(tfm);
171
172 if (shash->export)
173 return shash->export(desc, out);
174
175 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
176 return 0;
177}
178EXPORT_SYMBOL_GPL(crypto_shash_export);
179
180int crypto_shash_import(struct shash_desc *desc, const void *in)
181{
182 struct crypto_shash *tfm = desc->tfm;
183 struct shash_alg *shash = crypto_shash_alg(tfm);
184
185 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
186 return -ENOKEY;
187
188 if (shash->import)
189 return shash->import(desc, in);
190
191 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
192 return 0;
193}
194EXPORT_SYMBOL_GPL(crypto_shash_import);
195
196static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
197{
198 struct crypto_shash *hash = __crypto_shash_cast(tfm);
199 struct shash_alg *alg = crypto_shash_alg(hash);
200
201 alg->exit_tfm(hash);
202}
203
204static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
205{
206 struct crypto_shash *hash = __crypto_shash_cast(tfm);
207 struct shash_alg *alg = crypto_shash_alg(hash);
208 int err;
209
210 hash->descsize = alg->descsize;
211
212 shash_set_needkey(hash, alg);
213
214 if (alg->exit_tfm)
215 tfm->exit = crypto_shash_exit_tfm;
216
217 if (!alg->init_tfm)
218 return 0;
219
220 err = alg->init_tfm(hash);
221 if (err)
222 return err;
223
224 /* ->init_tfm() may have increased the descsize. */
225 if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
226 if (alg->exit_tfm)
227 alg->exit_tfm(hash);
228 return -EINVAL;
229 }
230
231 return 0;
232}
233
234static void crypto_shash_free_instance(struct crypto_instance *inst)
235{
236 struct shash_instance *shash = shash_instance(inst);
237
238 shash->free(shash);
239}
240
241static int __maybe_unused crypto_shash_report(
242 struct sk_buff *skb, struct crypto_alg *alg)
243{
244 struct crypto_report_hash rhash;
245 struct shash_alg *salg = __crypto_shash_alg(alg);
246
247 memset(&rhash, 0, sizeof(rhash));
248
249 strscpy(rhash.type, "shash", sizeof(rhash.type));
250
251 rhash.blocksize = alg->cra_blocksize;
252 rhash.digestsize = salg->digestsize;
253
254 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
255}
256
257static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
258 __maybe_unused;
259static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
260{
261 struct shash_alg *salg = __crypto_shash_alg(alg);
262
263 seq_printf(m, "type : shash\n");
264 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
265 seq_printf(m, "digestsize : %u\n", salg->digestsize);
266}
267
268static int __maybe_unused crypto_shash_report_stat(
269 struct sk_buff *skb, struct crypto_alg *alg)
270{
271 return crypto_hash_report_stat(skb, alg, "shash");
272}
273
274const struct crypto_type crypto_shash_type = {
275 .extsize = crypto_alg_extsize,
276 .init_tfm = crypto_shash_init_tfm,
277 .free = crypto_shash_free_instance,
278#ifdef CONFIG_PROC_FS
279 .show = crypto_shash_show,
280#endif
281#if IS_ENABLED(CONFIG_CRYPTO_USER)
282 .report = crypto_shash_report,
283#endif
284#ifdef CONFIG_CRYPTO_STATS
285 .report_stat = crypto_shash_report_stat,
286#endif
287 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
288 .maskset = CRYPTO_ALG_TYPE_MASK,
289 .type = CRYPTO_ALG_TYPE_SHASH,
290 .tfmsize = offsetof(struct crypto_shash, base),
291};
292
293int crypto_grab_shash(struct crypto_shash_spawn *spawn,
294 struct crypto_instance *inst,
295 const char *name, u32 type, u32 mask)
296{
297 spawn->base.frontend = &crypto_shash_type;
298 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
299}
300EXPORT_SYMBOL_GPL(crypto_grab_shash);
301
302struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
303 u32 mask)
304{
305 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
306}
307EXPORT_SYMBOL_GPL(crypto_alloc_shash);
308
309int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
310{
311 return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
312}
313EXPORT_SYMBOL_GPL(crypto_has_shash);
314
315struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
316{
317 struct crypto_tfm *tfm = crypto_shash_tfm(hash);
318 struct shash_alg *alg = crypto_shash_alg(hash);
319 struct crypto_shash *nhash;
320 int err;
321
322 if (!crypto_shash_alg_has_setkey(alg)) {
323 tfm = crypto_tfm_get(tfm);
324 if (IS_ERR(tfm))
325 return ERR_CAST(tfm);
326
327 return hash;
328 }
329
330 if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init))
331 return ERR_PTR(-ENOSYS);
332
333 nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
334 if (IS_ERR(nhash))
335 return nhash;
336
337 nhash->descsize = hash->descsize;
338
339 if (alg->clone_tfm) {
340 err = alg->clone_tfm(nhash, hash);
341 if (err) {
342 crypto_free_shash(nhash);
343 return ERR_PTR(err);
344 }
345 }
346
347 return nhash;
348}
349EXPORT_SYMBOL_GPL(crypto_clone_shash);
350
351int hash_prepare_alg(struct hash_alg_common *alg)
352{
353 struct crypto_istat_hash *istat = hash_get_stat(alg);
354 struct crypto_alg *base = &alg->base;
355
356 if (alg->digestsize > HASH_MAX_DIGESTSIZE)
357 return -EINVAL;
358
359 /* alignmask is not useful for hashes, so it is not supported. */
360 if (base->cra_alignmask)
361 return -EINVAL;
362
363 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
364
365 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
366 memset(istat, 0, sizeof(*istat));
367
368 return 0;
369}
370
371static int shash_prepare_alg(struct shash_alg *alg)
372{
373 struct crypto_alg *base = &alg->halg.base;
374 int err;
375
376 if (alg->descsize > HASH_MAX_DESCSIZE)
377 return -EINVAL;
378
379 if ((alg->export && !alg->import) || (alg->import && !alg->export))
380 return -EINVAL;
381
382 err = hash_prepare_alg(&alg->halg);
383 if (err)
384 return err;
385
386 base->cra_type = &crypto_shash_type;
387 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
388
389 /*
390 * Handle missing optional functions. For each one we can either
391 * install a default here, or we can leave the pointer as NULL and check
392 * the pointer for NULL in crypto_shash_*(), avoiding an indirect call
393 * when the default behavior is desired. For ->finup and ->digest we
394 * install defaults, since for optimal performance algorithms should
395 * implement these anyway. On the other hand, for ->import and
396 * ->export the common case and best performance comes from the simple
397 * memcpy of the shash_desc_ctx, so when those pointers are NULL we
398 * leave them NULL and provide the memcpy with no indirect call.
399 */
400 if (!alg->finup)
401 alg->finup = shash_default_finup;
402 if (!alg->digest)
403 alg->digest = shash_default_digest;
404 if (!alg->export)
405 alg->halg.statesize = alg->descsize;
406 if (!alg->setkey)
407 alg->setkey = shash_no_setkey;
408
409 return 0;
410}
411
412int crypto_register_shash(struct shash_alg *alg)
413{
414 struct crypto_alg *base = &alg->base;
415 int err;
416
417 err = shash_prepare_alg(alg);
418 if (err)
419 return err;
420
421 return crypto_register_alg(base);
422}
423EXPORT_SYMBOL_GPL(crypto_register_shash);
424
425void crypto_unregister_shash(struct shash_alg *alg)
426{
427 crypto_unregister_alg(&alg->base);
428}
429EXPORT_SYMBOL_GPL(crypto_unregister_shash);
430
431int crypto_register_shashes(struct shash_alg *algs, int count)
432{
433 int i, ret;
434
435 for (i = 0; i < count; i++) {
436 ret = crypto_register_shash(&algs[i]);
437 if (ret)
438 goto err;
439 }
440
441 return 0;
442
443err:
444 for (--i; i >= 0; --i)
445 crypto_unregister_shash(&algs[i]);
446
447 return ret;
448}
449EXPORT_SYMBOL_GPL(crypto_register_shashes);
450
451void crypto_unregister_shashes(struct shash_alg *algs, int count)
452{
453 int i;
454
455 for (i = count - 1; i >= 0; --i)
456 crypto_unregister_shash(&algs[i]);
457}
458EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
459
460int shash_register_instance(struct crypto_template *tmpl,
461 struct shash_instance *inst)
462{
463 int err;
464
465 if (WARN_ON(!inst->free))
466 return -EINVAL;
467
468 err = shash_prepare_alg(&inst->alg);
469 if (err)
470 return err;
471
472 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
473}
474EXPORT_SYMBOL_GPL(shash_register_instance);
475
476void shash_free_singlespawn_instance(struct shash_instance *inst)
477{
478 crypto_drop_spawn(shash_instance_ctx(inst));
479 kfree(inst);
480}
481EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
482
483MODULE_LICENSE("GPL");
484MODULE_DESCRIPTION("Synchronous cryptographic hash type");