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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/*
2 * Synchronous Cryptographic Hash operations.
3 *
4 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/scatterwalk.h>
14#include <crypto/internal/hash.h>
15#include <linux/err.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/seq_file.h>
20
21#include "internal.h"
22
23static const struct crypto_type crypto_shash_type;
24
25static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
26 unsigned int keylen)
27{
28 return -ENOSYS;
29}
30
31static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
32 unsigned int keylen)
33{
34 struct shash_alg *shash = crypto_shash_alg(tfm);
35 unsigned long alignmask = crypto_shash_alignmask(tfm);
36 unsigned long absize;
37 u8 *buffer, *alignbuffer;
38 int err;
39
40 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
41 buffer = kmalloc(absize, GFP_KERNEL);
42 if (!buffer)
43 return -ENOMEM;
44
45 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
46 memcpy(alignbuffer, key, keylen);
47 err = shash->setkey(tfm, alignbuffer, keylen);
48 kzfree(buffer);
49 return err;
50}
51
52int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
53 unsigned int keylen)
54{
55 struct shash_alg *shash = crypto_shash_alg(tfm);
56 unsigned long alignmask = crypto_shash_alignmask(tfm);
57
58 if ((unsigned long)key & alignmask)
59 return shash_setkey_unaligned(tfm, key, keylen);
60
61 return shash->setkey(tfm, key, keylen);
62}
63EXPORT_SYMBOL_GPL(crypto_shash_setkey);
64
65static inline unsigned int shash_align_buffer_size(unsigned len,
66 unsigned long mask)
67{
68 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
69}
70
71static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
72 unsigned int len)
73{
74 struct crypto_shash *tfm = desc->tfm;
75 struct shash_alg *shash = crypto_shash_alg(tfm);
76 unsigned long alignmask = crypto_shash_alignmask(tfm);
77 unsigned int unaligned_len = alignmask + 1 -
78 ((unsigned long)data & alignmask);
79 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
80 __attribute__ ((aligned));
81 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
82 int err;
83
84 if (unaligned_len > len)
85 unaligned_len = len;
86
87 memcpy(buf, data, unaligned_len);
88 err = shash->update(desc, buf, unaligned_len);
89 memset(buf, 0, unaligned_len);
90
91 return err ?:
92 shash->update(desc, data + unaligned_len, len - unaligned_len);
93}
94
95int crypto_shash_update(struct shash_desc *desc, const u8 *data,
96 unsigned int len)
97{
98 struct crypto_shash *tfm = desc->tfm;
99 struct shash_alg *shash = crypto_shash_alg(tfm);
100 unsigned long alignmask = crypto_shash_alignmask(tfm);
101
102 if ((unsigned long)data & alignmask)
103 return shash_update_unaligned(desc, data, len);
104
105 return shash->update(desc, data, len);
106}
107EXPORT_SYMBOL_GPL(crypto_shash_update);
108
109static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
110{
111 struct crypto_shash *tfm = desc->tfm;
112 unsigned long alignmask = crypto_shash_alignmask(tfm);
113 struct shash_alg *shash = crypto_shash_alg(tfm);
114 unsigned int ds = crypto_shash_digestsize(tfm);
115 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
116 __attribute__ ((aligned));
117 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
118 int err;
119
120 err = shash->final(desc, buf);
121 if (err)
122 goto out;
123
124 memcpy(out, buf, ds);
125
126out:
127 memset(buf, 0, ds);
128 return err;
129}
130
131int crypto_shash_final(struct shash_desc *desc, u8 *out)
132{
133 struct crypto_shash *tfm = desc->tfm;
134 struct shash_alg *shash = crypto_shash_alg(tfm);
135 unsigned long alignmask = crypto_shash_alignmask(tfm);
136
137 if ((unsigned long)out & alignmask)
138 return shash_final_unaligned(desc, out);
139
140 return shash->final(desc, out);
141}
142EXPORT_SYMBOL_GPL(crypto_shash_final);
143
144static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
145 unsigned int len, u8 *out)
146{
147 return crypto_shash_update(desc, data, len) ?:
148 crypto_shash_final(desc, out);
149}
150
151int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
152 unsigned int len, u8 *out)
153{
154 struct crypto_shash *tfm = desc->tfm;
155 struct shash_alg *shash = crypto_shash_alg(tfm);
156 unsigned long alignmask = crypto_shash_alignmask(tfm);
157
158 if (((unsigned long)data | (unsigned long)out) & alignmask)
159 return shash_finup_unaligned(desc, data, len, out);
160
161 return shash->finup(desc, data, len, out);
162}
163EXPORT_SYMBOL_GPL(crypto_shash_finup);
164
165static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
166 unsigned int len, u8 *out)
167{
168 return crypto_shash_init(desc) ?:
169 crypto_shash_finup(desc, data, len, out);
170}
171
172int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
173 unsigned int len, u8 *out)
174{
175 struct crypto_shash *tfm = desc->tfm;
176 struct shash_alg *shash = crypto_shash_alg(tfm);
177 unsigned long alignmask = crypto_shash_alignmask(tfm);
178
179 if (((unsigned long)data | (unsigned long)out) & alignmask)
180 return shash_digest_unaligned(desc, data, len, out);
181
182 return shash->digest(desc, data, len, out);
183}
184EXPORT_SYMBOL_GPL(crypto_shash_digest);
185
186static int shash_default_export(struct shash_desc *desc, void *out)
187{
188 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
189 return 0;
190}
191
192static int shash_default_import(struct shash_desc *desc, const void *in)
193{
194 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
195 return 0;
196}
197
198static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
199 unsigned int keylen)
200{
201 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
202
203 return crypto_shash_setkey(*ctx, key, keylen);
204}
205
206static int shash_async_init(struct ahash_request *req)
207{
208 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
209 struct shash_desc *desc = ahash_request_ctx(req);
210
211 desc->tfm = *ctx;
212 desc->flags = req->base.flags;
213
214 return crypto_shash_init(desc);
215}
216
217int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
218{
219 struct crypto_hash_walk walk;
220 int nbytes;
221
222 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
223 nbytes = crypto_hash_walk_done(&walk, nbytes))
224 nbytes = crypto_shash_update(desc, walk.data, nbytes);
225
226 return nbytes;
227}
228EXPORT_SYMBOL_GPL(shash_ahash_update);
229
230static int shash_async_update(struct ahash_request *req)
231{
232 return shash_ahash_update(req, ahash_request_ctx(req));
233}
234
235static int shash_async_final(struct ahash_request *req)
236{
237 return crypto_shash_final(ahash_request_ctx(req), req->result);
238}
239
240int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
241{
242 struct crypto_hash_walk walk;
243 int nbytes;
244
245 nbytes = crypto_hash_walk_first(req, &walk);
246 if (!nbytes)
247 return crypto_shash_final(desc, req->result);
248
249 do {
250 nbytes = crypto_hash_walk_last(&walk) ?
251 crypto_shash_finup(desc, walk.data, nbytes,
252 req->result) :
253 crypto_shash_update(desc, walk.data, nbytes);
254 nbytes = crypto_hash_walk_done(&walk, nbytes);
255 } while (nbytes > 0);
256
257 return nbytes;
258}
259EXPORT_SYMBOL_GPL(shash_ahash_finup);
260
261static int shash_async_finup(struct ahash_request *req)
262{
263 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
264 struct shash_desc *desc = ahash_request_ctx(req);
265
266 desc->tfm = *ctx;
267 desc->flags = req->base.flags;
268
269 return shash_ahash_finup(req, desc);
270}
271
272int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
273{
274 struct scatterlist *sg = req->src;
275 unsigned int offset = sg->offset;
276 unsigned int nbytes = req->nbytes;
277 int err;
278
279 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
280 void *data;
281
282 data = crypto_kmap(sg_page(sg), 0);
283 err = crypto_shash_digest(desc, data + offset, nbytes,
284 req->result);
285 crypto_kunmap(data, 0);
286 crypto_yield(desc->flags);
287 } else
288 err = crypto_shash_init(desc) ?:
289 shash_ahash_finup(req, desc);
290
291 return err;
292}
293EXPORT_SYMBOL_GPL(shash_ahash_digest);
294
295static int shash_async_digest(struct ahash_request *req)
296{
297 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
298 struct shash_desc *desc = ahash_request_ctx(req);
299
300 desc->tfm = *ctx;
301 desc->flags = req->base.flags;
302
303 return shash_ahash_digest(req, desc);
304}
305
306static int shash_async_export(struct ahash_request *req, void *out)
307{
308 return crypto_shash_export(ahash_request_ctx(req), out);
309}
310
311static int shash_async_import(struct ahash_request *req, const void *in)
312{
313 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
314 struct shash_desc *desc = ahash_request_ctx(req);
315
316 desc->tfm = *ctx;
317 desc->flags = req->base.flags;
318
319 return crypto_shash_import(desc, in);
320}
321
322static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
323{
324 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
325
326 crypto_free_shash(*ctx);
327}
328
329int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
330{
331 struct crypto_alg *calg = tfm->__crt_alg;
332 struct shash_alg *alg = __crypto_shash_alg(calg);
333 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
334 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
335 struct crypto_shash *shash;
336
337 if (!crypto_mod_get(calg))
338 return -EAGAIN;
339
340 shash = crypto_create_tfm(calg, &crypto_shash_type);
341 if (IS_ERR(shash)) {
342 crypto_mod_put(calg);
343 return PTR_ERR(shash);
344 }
345
346 *ctx = shash;
347 tfm->exit = crypto_exit_shash_ops_async;
348
349 crt->init = shash_async_init;
350 crt->update = shash_async_update;
351 crt->final = shash_async_final;
352 crt->finup = shash_async_finup;
353 crt->digest = shash_async_digest;
354
355 if (alg->setkey)
356 crt->setkey = shash_async_setkey;
357 if (alg->export)
358 crt->export = shash_async_export;
359 if (alg->import)
360 crt->import = shash_async_import;
361
362 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
363
364 return 0;
365}
366
367static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
368 unsigned int keylen)
369{
370 struct shash_desc **descp = crypto_hash_ctx(tfm);
371 struct shash_desc *desc = *descp;
372
373 return crypto_shash_setkey(desc->tfm, key, keylen);
374}
375
376static int shash_compat_init(struct hash_desc *hdesc)
377{
378 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
379 struct shash_desc *desc = *descp;
380
381 desc->flags = hdesc->flags;
382
383 return crypto_shash_init(desc);
384}
385
386static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
387 unsigned int len)
388{
389 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
390 struct shash_desc *desc = *descp;
391 struct crypto_hash_walk walk;
392 int nbytes;
393
394 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
395 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
396 nbytes = crypto_shash_update(desc, walk.data, nbytes);
397
398 return nbytes;
399}
400
401static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
402{
403 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
404
405 return crypto_shash_final(*descp, out);
406}
407
408static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
409 unsigned int nbytes, u8 *out)
410{
411 unsigned int offset = sg->offset;
412 int err;
413
414 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
415 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
416 struct shash_desc *desc = *descp;
417 void *data;
418
419 desc->flags = hdesc->flags;
420
421 data = crypto_kmap(sg_page(sg), 0);
422 err = crypto_shash_digest(desc, data + offset, nbytes, out);
423 crypto_kunmap(data, 0);
424 crypto_yield(desc->flags);
425 goto out;
426 }
427
428 err = shash_compat_init(hdesc);
429 if (err)
430 goto out;
431
432 err = shash_compat_update(hdesc, sg, nbytes);
433 if (err)
434 goto out;
435
436 err = shash_compat_final(hdesc, out);
437
438out:
439 return err;
440}
441
442static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
443{
444 struct shash_desc **descp = crypto_tfm_ctx(tfm);
445 struct shash_desc *desc = *descp;
446
447 crypto_free_shash(desc->tfm);
448 kzfree(desc);
449}
450
451static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
452{
453 struct hash_tfm *crt = &tfm->crt_hash;
454 struct crypto_alg *calg = tfm->__crt_alg;
455 struct shash_alg *alg = __crypto_shash_alg(calg);
456 struct shash_desc **descp = crypto_tfm_ctx(tfm);
457 struct crypto_shash *shash;
458 struct shash_desc *desc;
459
460 if (!crypto_mod_get(calg))
461 return -EAGAIN;
462
463 shash = crypto_create_tfm(calg, &crypto_shash_type);
464 if (IS_ERR(shash)) {
465 crypto_mod_put(calg);
466 return PTR_ERR(shash);
467 }
468
469 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
470 GFP_KERNEL);
471 if (!desc) {
472 crypto_free_shash(shash);
473 return -ENOMEM;
474 }
475
476 *descp = desc;
477 desc->tfm = shash;
478 tfm->exit = crypto_exit_shash_ops_compat;
479
480 crt->init = shash_compat_init;
481 crt->update = shash_compat_update;
482 crt->final = shash_compat_final;
483 crt->digest = shash_compat_digest;
484 crt->setkey = shash_compat_setkey;
485
486 crt->digestsize = alg->digestsize;
487
488 return 0;
489}
490
491static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
492{
493 switch (mask & CRYPTO_ALG_TYPE_MASK) {
494 case CRYPTO_ALG_TYPE_HASH_MASK:
495 return crypto_init_shash_ops_compat(tfm);
496 }
497
498 return -EINVAL;
499}
500
501static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
502 u32 mask)
503{
504 switch (mask & CRYPTO_ALG_TYPE_MASK) {
505 case CRYPTO_ALG_TYPE_HASH_MASK:
506 return sizeof(struct shash_desc *);
507 }
508
509 return 0;
510}
511
512static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
513{
514 struct crypto_shash *hash = __crypto_shash_cast(tfm);
515
516 hash->descsize = crypto_shash_alg(hash)->descsize;
517 return 0;
518}
519
520static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
521{
522 return alg->cra_ctxsize;
523}
524
525static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
526 __attribute__ ((unused));
527static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
528{
529 struct shash_alg *salg = __crypto_shash_alg(alg);
530
531 seq_printf(m, "type : shash\n");
532 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
533 seq_printf(m, "digestsize : %u\n", salg->digestsize);
534}
535
536static const struct crypto_type crypto_shash_type = {
537 .ctxsize = crypto_shash_ctxsize,
538 .extsize = crypto_shash_extsize,
539 .init = crypto_init_shash_ops,
540 .init_tfm = crypto_shash_init_tfm,
541#ifdef CONFIG_PROC_FS
542 .show = crypto_shash_show,
543#endif
544 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
545 .maskset = CRYPTO_ALG_TYPE_MASK,
546 .type = CRYPTO_ALG_TYPE_SHASH,
547 .tfmsize = offsetof(struct crypto_shash, base),
548};
549
550struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
551 u32 mask)
552{
553 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
554}
555EXPORT_SYMBOL_GPL(crypto_alloc_shash);
556
557static int shash_prepare_alg(struct shash_alg *alg)
558{
559 struct crypto_alg *base = &alg->base;
560
561 if (alg->digestsize > PAGE_SIZE / 8 ||
562 alg->descsize > PAGE_SIZE / 8 ||
563 alg->statesize > PAGE_SIZE / 8)
564 return -EINVAL;
565
566 base->cra_type = &crypto_shash_type;
567 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
568 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
569
570 if (!alg->finup)
571 alg->finup = shash_finup_unaligned;
572 if (!alg->digest)
573 alg->digest = shash_digest_unaligned;
574 if (!alg->export) {
575 alg->export = shash_default_export;
576 alg->import = shash_default_import;
577 alg->statesize = alg->descsize;
578 }
579 if (!alg->setkey)
580 alg->setkey = shash_no_setkey;
581
582 return 0;
583}
584
585int crypto_register_shash(struct shash_alg *alg)
586{
587 struct crypto_alg *base = &alg->base;
588 int err;
589
590 err = shash_prepare_alg(alg);
591 if (err)
592 return err;
593
594 return crypto_register_alg(base);
595}
596EXPORT_SYMBOL_GPL(crypto_register_shash);
597
598int crypto_unregister_shash(struct shash_alg *alg)
599{
600 return crypto_unregister_alg(&alg->base);
601}
602EXPORT_SYMBOL_GPL(crypto_unregister_shash);
603
604int shash_register_instance(struct crypto_template *tmpl,
605 struct shash_instance *inst)
606{
607 int err;
608
609 err = shash_prepare_alg(&inst->alg);
610 if (err)
611 return err;
612
613 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
614}
615EXPORT_SYMBOL_GPL(shash_register_instance);
616
617void shash_free_instance(struct crypto_instance *inst)
618{
619 crypto_drop_spawn(crypto_instance_ctx(inst));
620 kfree(shash_instance(inst));
621}
622EXPORT_SYMBOL_GPL(shash_free_instance);
623
624int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
625 struct shash_alg *alg,
626 struct crypto_instance *inst)
627{
628 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
629 &crypto_shash_type);
630}
631EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
632
633struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
634{
635 struct crypto_alg *alg;
636
637 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
638 return IS_ERR(alg) ? ERR_CAST(alg) :
639 container_of(alg, struct shash_alg, base);
640}
641EXPORT_SYMBOL_GPL(shash_attr_alg);
642
643MODULE_LICENSE("GPL");
644MODULE_DESCRIPTION("Synchronous cryptographic hash type");