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1/*
2 * Synchronous Cryptographic Hash operations.
3 *
4 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/scatterwalk.h>
14#include <crypto/internal/hash.h>
15#include <linux/err.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/seq_file.h>
20#include <linux/cryptouser.h>
21#include <net/netlink.h>
22#include <linux/compiler.h>
23
24#include "internal.h"
25
26static const struct crypto_type crypto_shash_type;
27
28int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
29 unsigned int keylen)
30{
31 return -ENOSYS;
32}
33EXPORT_SYMBOL_GPL(shash_no_setkey);
34
35static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
36 unsigned int keylen)
37{
38 struct shash_alg *shash = crypto_shash_alg(tfm);
39 unsigned long alignmask = crypto_shash_alignmask(tfm);
40 unsigned long absize;
41 u8 *buffer, *alignbuffer;
42 int err;
43
44 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
45 buffer = kmalloc(absize, GFP_ATOMIC);
46 if (!buffer)
47 return -ENOMEM;
48
49 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
50 memcpy(alignbuffer, key, keylen);
51 err = shash->setkey(tfm, alignbuffer, keylen);
52 kzfree(buffer);
53 return err;
54}
55
56int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
57 unsigned int keylen)
58{
59 struct shash_alg *shash = crypto_shash_alg(tfm);
60 unsigned long alignmask = crypto_shash_alignmask(tfm);
61 int err;
62
63 if ((unsigned long)key & alignmask)
64 err = shash_setkey_unaligned(tfm, key, keylen);
65 else
66 err = shash->setkey(tfm, key, keylen);
67
68 if (err)
69 return err;
70
71 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
72 return 0;
73}
74EXPORT_SYMBOL_GPL(crypto_shash_setkey);
75
76static inline unsigned int shash_align_buffer_size(unsigned len,
77 unsigned long mask)
78{
79 typedef u8 __aligned_largest u8_aligned;
80 return len + (mask & ~(__alignof__(u8_aligned) - 1));
81}
82
83static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
84 unsigned int len)
85{
86 struct crypto_shash *tfm = desc->tfm;
87 struct shash_alg *shash = crypto_shash_alg(tfm);
88 unsigned long alignmask = crypto_shash_alignmask(tfm);
89 unsigned int unaligned_len = alignmask + 1 -
90 ((unsigned long)data & alignmask);
91 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
92 __aligned_largest;
93 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
94 int err;
95
96 if (unaligned_len > len)
97 unaligned_len = len;
98
99 memcpy(buf, data, unaligned_len);
100 err = shash->update(desc, buf, unaligned_len);
101 memset(buf, 0, unaligned_len);
102
103 return err ?:
104 shash->update(desc, data + unaligned_len, len - unaligned_len);
105}
106
107int crypto_shash_update(struct shash_desc *desc, const u8 *data,
108 unsigned int len)
109{
110 struct crypto_shash *tfm = desc->tfm;
111 struct shash_alg *shash = crypto_shash_alg(tfm);
112 unsigned long alignmask = crypto_shash_alignmask(tfm);
113
114 if ((unsigned long)data & alignmask)
115 return shash_update_unaligned(desc, data, len);
116
117 return shash->update(desc, data, len);
118}
119EXPORT_SYMBOL_GPL(crypto_shash_update);
120
121static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
122{
123 struct crypto_shash *tfm = desc->tfm;
124 unsigned long alignmask = crypto_shash_alignmask(tfm);
125 struct shash_alg *shash = crypto_shash_alg(tfm);
126 unsigned int ds = crypto_shash_digestsize(tfm);
127 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
128 __aligned_largest;
129 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
130 int err;
131
132 err = shash->final(desc, buf);
133 if (err)
134 goto out;
135
136 memcpy(out, buf, ds);
137
138out:
139 memset(buf, 0, ds);
140 return err;
141}
142
143int crypto_shash_final(struct shash_desc *desc, u8 *out)
144{
145 struct crypto_shash *tfm = desc->tfm;
146 struct shash_alg *shash = crypto_shash_alg(tfm);
147 unsigned long alignmask = crypto_shash_alignmask(tfm);
148
149 if ((unsigned long)out & alignmask)
150 return shash_final_unaligned(desc, out);
151
152 return shash->final(desc, out);
153}
154EXPORT_SYMBOL_GPL(crypto_shash_final);
155
156static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
157 unsigned int len, u8 *out)
158{
159 return crypto_shash_update(desc, data, len) ?:
160 crypto_shash_final(desc, out);
161}
162
163int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
164 unsigned int len, u8 *out)
165{
166 struct crypto_shash *tfm = desc->tfm;
167 struct shash_alg *shash = crypto_shash_alg(tfm);
168 unsigned long alignmask = crypto_shash_alignmask(tfm);
169
170 if (((unsigned long)data | (unsigned long)out) & alignmask)
171 return shash_finup_unaligned(desc, data, len, out);
172
173 return shash->finup(desc, data, len, out);
174}
175EXPORT_SYMBOL_GPL(crypto_shash_finup);
176
177static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
178 unsigned int len, u8 *out)
179{
180 return crypto_shash_init(desc) ?:
181 crypto_shash_finup(desc, data, len, out);
182}
183
184int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
185 unsigned int len, u8 *out)
186{
187 struct crypto_shash *tfm = desc->tfm;
188 struct shash_alg *shash = crypto_shash_alg(tfm);
189 unsigned long alignmask = crypto_shash_alignmask(tfm);
190
191 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
192 return -ENOKEY;
193
194 if (((unsigned long)data | (unsigned long)out) & alignmask)
195 return shash_digest_unaligned(desc, data, len, out);
196
197 return shash->digest(desc, data, len, out);
198}
199EXPORT_SYMBOL_GPL(crypto_shash_digest);
200
201static int shash_default_export(struct shash_desc *desc, void *out)
202{
203 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
204 return 0;
205}
206
207static int shash_default_import(struct shash_desc *desc, const void *in)
208{
209 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
210 return 0;
211}
212
213static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
214 unsigned int keylen)
215{
216 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
217
218 return crypto_shash_setkey(*ctx, key, keylen);
219}
220
221static int shash_async_init(struct ahash_request *req)
222{
223 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
224 struct shash_desc *desc = ahash_request_ctx(req);
225
226 desc->tfm = *ctx;
227 desc->flags = req->base.flags;
228
229 return crypto_shash_init(desc);
230}
231
232int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
233{
234 struct crypto_hash_walk walk;
235 int nbytes;
236
237 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
238 nbytes = crypto_hash_walk_done(&walk, nbytes))
239 nbytes = crypto_shash_update(desc, walk.data, nbytes);
240
241 return nbytes;
242}
243EXPORT_SYMBOL_GPL(shash_ahash_update);
244
245static int shash_async_update(struct ahash_request *req)
246{
247 return shash_ahash_update(req, ahash_request_ctx(req));
248}
249
250static int shash_async_final(struct ahash_request *req)
251{
252 return crypto_shash_final(ahash_request_ctx(req), req->result);
253}
254
255int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
256{
257 struct crypto_hash_walk walk;
258 int nbytes;
259
260 nbytes = crypto_hash_walk_first(req, &walk);
261 if (!nbytes)
262 return crypto_shash_final(desc, req->result);
263
264 do {
265 nbytes = crypto_hash_walk_last(&walk) ?
266 crypto_shash_finup(desc, walk.data, nbytes,
267 req->result) :
268 crypto_shash_update(desc, walk.data, nbytes);
269 nbytes = crypto_hash_walk_done(&walk, nbytes);
270 } while (nbytes > 0);
271
272 return nbytes;
273}
274EXPORT_SYMBOL_GPL(shash_ahash_finup);
275
276static int shash_async_finup(struct ahash_request *req)
277{
278 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
279 struct shash_desc *desc = ahash_request_ctx(req);
280
281 desc->tfm = *ctx;
282 desc->flags = req->base.flags;
283
284 return shash_ahash_finup(req, desc);
285}
286
287int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
288{
289 unsigned int nbytes = req->nbytes;
290 struct scatterlist *sg;
291 unsigned int offset;
292 int err;
293
294 if (nbytes &&
295 (sg = req->src, offset = sg->offset,
296 nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
297 void *data;
298
299 data = kmap_atomic(sg_page(sg));
300 err = crypto_shash_digest(desc, data + offset, nbytes,
301 req->result);
302 kunmap_atomic(data);
303 crypto_yield(desc->flags);
304 } else
305 err = crypto_shash_init(desc) ?:
306 shash_ahash_finup(req, desc);
307
308 return err;
309}
310EXPORT_SYMBOL_GPL(shash_ahash_digest);
311
312static int shash_async_digest(struct ahash_request *req)
313{
314 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
315 struct shash_desc *desc = ahash_request_ctx(req);
316
317 desc->tfm = *ctx;
318 desc->flags = req->base.flags;
319
320 return shash_ahash_digest(req, desc);
321}
322
323static int shash_async_export(struct ahash_request *req, void *out)
324{
325 return crypto_shash_export(ahash_request_ctx(req), out);
326}
327
328static int shash_async_import(struct ahash_request *req, const void *in)
329{
330 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
331 struct shash_desc *desc = ahash_request_ctx(req);
332
333 desc->tfm = *ctx;
334 desc->flags = req->base.flags;
335
336 return crypto_shash_import(desc, in);
337}
338
339static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
340{
341 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
342
343 crypto_free_shash(*ctx);
344}
345
346int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
347{
348 struct crypto_alg *calg = tfm->__crt_alg;
349 struct shash_alg *alg = __crypto_shash_alg(calg);
350 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
351 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
352 struct crypto_shash *shash;
353
354 if (!crypto_mod_get(calg))
355 return -EAGAIN;
356
357 shash = crypto_create_tfm(calg, &crypto_shash_type);
358 if (IS_ERR(shash)) {
359 crypto_mod_put(calg);
360 return PTR_ERR(shash);
361 }
362
363 *ctx = shash;
364 tfm->exit = crypto_exit_shash_ops_async;
365
366 crt->init = shash_async_init;
367 crt->update = shash_async_update;
368 crt->final = shash_async_final;
369 crt->finup = shash_async_finup;
370 crt->digest = shash_async_digest;
371 crt->setkey = shash_async_setkey;
372
373 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
374 CRYPTO_TFM_NEED_KEY);
375
376 if (alg->export)
377 crt->export = shash_async_export;
378 if (alg->import)
379 crt->import = shash_async_import;
380
381 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
382
383 return 0;
384}
385
386static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
387{
388 struct crypto_shash *hash = __crypto_shash_cast(tfm);
389 struct shash_alg *alg = crypto_shash_alg(hash);
390
391 hash->descsize = alg->descsize;
392
393 if (crypto_shash_alg_has_setkey(alg) &&
394 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
395 crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
396
397 return 0;
398}
399
400#ifdef CONFIG_NET
401static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
402{
403 struct crypto_report_hash rhash;
404 struct shash_alg *salg = __crypto_shash_alg(alg);
405
406 strncpy(rhash.type, "shash", sizeof(rhash.type));
407
408 rhash.blocksize = alg->cra_blocksize;
409 rhash.digestsize = salg->digestsize;
410
411 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
412 sizeof(struct crypto_report_hash), &rhash))
413 goto nla_put_failure;
414 return 0;
415
416nla_put_failure:
417 return -EMSGSIZE;
418}
419#else
420static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
421{
422 return -ENOSYS;
423}
424#endif
425
426static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
427 __maybe_unused;
428static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
429{
430 struct shash_alg *salg = __crypto_shash_alg(alg);
431
432 seq_printf(m, "type : shash\n");
433 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
434 seq_printf(m, "digestsize : %u\n", salg->digestsize);
435}
436
437static const struct crypto_type crypto_shash_type = {
438 .extsize = crypto_alg_extsize,
439 .init_tfm = crypto_shash_init_tfm,
440#ifdef CONFIG_PROC_FS
441 .show = crypto_shash_show,
442#endif
443 .report = crypto_shash_report,
444 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
445 .maskset = CRYPTO_ALG_TYPE_MASK,
446 .type = CRYPTO_ALG_TYPE_SHASH,
447 .tfmsize = offsetof(struct crypto_shash, base),
448};
449
450struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
451 u32 mask)
452{
453 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
454}
455EXPORT_SYMBOL_GPL(crypto_alloc_shash);
456
457static int shash_prepare_alg(struct shash_alg *alg)
458{
459 struct crypto_alg *base = &alg->base;
460
461 if (alg->digestsize > PAGE_SIZE / 8 ||
462 alg->descsize > PAGE_SIZE / 8 ||
463 alg->statesize > PAGE_SIZE / 8)
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");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Synchronous Cryptographic Hash operations.
4 *
5 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/scatterwalk.h>
9#include <crypto/internal/hash.h>
10#include <linux/err.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/seq_file.h>
15#include <linux/cryptouser.h>
16#include <net/netlink.h>
17#include <linux/compiler.h>
18
19#include "internal.h"
20
21static const struct crypto_type crypto_shash_type;
22
23int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
24 unsigned int keylen)
25{
26 return -ENOSYS;
27}
28EXPORT_SYMBOL_GPL(shash_no_setkey);
29
30static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
31 unsigned int keylen)
32{
33 struct shash_alg *shash = crypto_shash_alg(tfm);
34 unsigned long alignmask = crypto_shash_alignmask(tfm);
35 unsigned long absize;
36 u8 *buffer, *alignbuffer;
37 int err;
38
39 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
40 buffer = kmalloc(absize, GFP_ATOMIC);
41 if (!buffer)
42 return -ENOMEM;
43
44 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
45 memcpy(alignbuffer, key, keylen);
46 err = shash->setkey(tfm, alignbuffer, keylen);
47 kfree_sensitive(buffer);
48 return err;
49}
50
51static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
52{
53 if (crypto_shash_alg_needs_key(alg))
54 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
55}
56
57int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
58 unsigned int keylen)
59{
60 struct shash_alg *shash = crypto_shash_alg(tfm);
61 unsigned long alignmask = crypto_shash_alignmask(tfm);
62 int err;
63
64 if ((unsigned long)key & alignmask)
65 err = shash_setkey_unaligned(tfm, key, keylen);
66 else
67 err = shash->setkey(tfm, key, keylen);
68
69 if (unlikely(err)) {
70 shash_set_needkey(tfm, shash);
71 return err;
72 }
73
74 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
75 return 0;
76}
77EXPORT_SYMBOL_GPL(crypto_shash_setkey);
78
79static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
80 unsigned int len)
81{
82 struct crypto_shash *tfm = desc->tfm;
83 struct shash_alg *shash = crypto_shash_alg(tfm);
84 unsigned long alignmask = crypto_shash_alignmask(tfm);
85 unsigned int unaligned_len = alignmask + 1 -
86 ((unsigned long)data & alignmask);
87 /*
88 * We cannot count on __aligned() working for large values:
89 * https://patchwork.kernel.org/patch/9507697/
90 */
91 u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
92 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
93 int err;
94
95 if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
96 return -EINVAL;
97
98 if (unaligned_len > len)
99 unaligned_len = len;
100
101 memcpy(buf, data, unaligned_len);
102 err = shash->update(desc, buf, unaligned_len);
103 memset(buf, 0, unaligned_len);
104
105 return err ?:
106 shash->update(desc, data + unaligned_len, len - unaligned_len);
107}
108
109int crypto_shash_update(struct shash_desc *desc, const u8 *data,
110 unsigned int len)
111{
112 struct crypto_shash *tfm = desc->tfm;
113 struct shash_alg *shash = crypto_shash_alg(tfm);
114 unsigned long alignmask = crypto_shash_alignmask(tfm);
115
116 if ((unsigned long)data & alignmask)
117 return shash_update_unaligned(desc, data, len);
118
119 return shash->update(desc, data, len);
120}
121EXPORT_SYMBOL_GPL(crypto_shash_update);
122
123static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
124{
125 struct crypto_shash *tfm = desc->tfm;
126 unsigned long alignmask = crypto_shash_alignmask(tfm);
127 struct shash_alg *shash = crypto_shash_alg(tfm);
128 unsigned int ds = crypto_shash_digestsize(tfm);
129 /*
130 * We cannot count on __aligned() working for large values:
131 * https://patchwork.kernel.org/patch/9507697/
132 */
133 u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
134 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
135 int err;
136
137 if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
138 return -EINVAL;
139
140 err = shash->final(desc, buf);
141 if (err)
142 goto out;
143
144 memcpy(out, buf, ds);
145
146out:
147 memset(buf, 0, ds);
148 return err;
149}
150
151int crypto_shash_final(struct shash_desc *desc, u8 *out)
152{
153 struct crypto_shash *tfm = desc->tfm;
154 struct shash_alg *shash = crypto_shash_alg(tfm);
155 unsigned long alignmask = crypto_shash_alignmask(tfm);
156
157 if ((unsigned long)out & alignmask)
158 return shash_final_unaligned(desc, out);
159
160 return shash->final(desc, out);
161}
162EXPORT_SYMBOL_GPL(crypto_shash_final);
163
164static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
165 unsigned int len, u8 *out)
166{
167 return crypto_shash_update(desc, data, len) ?:
168 crypto_shash_final(desc, out);
169}
170
171int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
172 unsigned int len, u8 *out)
173{
174 struct crypto_shash *tfm = desc->tfm;
175 struct shash_alg *shash = crypto_shash_alg(tfm);
176 unsigned long alignmask = crypto_shash_alignmask(tfm);
177
178 if (((unsigned long)data | (unsigned long)out) & alignmask)
179 return shash_finup_unaligned(desc, data, len, out);
180
181 return shash->finup(desc, data, len, out);
182}
183EXPORT_SYMBOL_GPL(crypto_shash_finup);
184
185static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
186 unsigned int len, u8 *out)
187{
188 return crypto_shash_init(desc) ?:
189 crypto_shash_finup(desc, data, len, out);
190}
191
192int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
193 unsigned int len, u8 *out)
194{
195 struct crypto_shash *tfm = desc->tfm;
196 struct shash_alg *shash = crypto_shash_alg(tfm);
197 unsigned long alignmask = crypto_shash_alignmask(tfm);
198
199 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
200 return -ENOKEY;
201
202 if (((unsigned long)data | (unsigned long)out) & alignmask)
203 return shash_digest_unaligned(desc, data, len, out);
204
205 return shash->digest(desc, data, len, out);
206}
207EXPORT_SYMBOL_GPL(crypto_shash_digest);
208
209int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
210 unsigned int len, u8 *out)
211{
212 SHASH_DESC_ON_STACK(desc, tfm);
213 int err;
214
215 desc->tfm = tfm;
216
217 err = crypto_shash_digest(desc, data, len, out);
218
219 shash_desc_zero(desc);
220
221 return err;
222}
223EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
224
225static int shash_default_export(struct shash_desc *desc, void *out)
226{
227 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
228 return 0;
229}
230
231static int shash_default_import(struct shash_desc *desc, const void *in)
232{
233 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
234 return 0;
235}
236
237static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
238 unsigned int keylen)
239{
240 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
241
242 return crypto_shash_setkey(*ctx, key, keylen);
243}
244
245static int shash_async_init(struct ahash_request *req)
246{
247 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
248 struct shash_desc *desc = ahash_request_ctx(req);
249
250 desc->tfm = *ctx;
251
252 return crypto_shash_init(desc);
253}
254
255int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
256{
257 struct crypto_hash_walk walk;
258 int nbytes;
259
260 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
261 nbytes = crypto_hash_walk_done(&walk, nbytes))
262 nbytes = crypto_shash_update(desc, walk.data, nbytes);
263
264 return nbytes;
265}
266EXPORT_SYMBOL_GPL(shash_ahash_update);
267
268static int shash_async_update(struct ahash_request *req)
269{
270 return shash_ahash_update(req, ahash_request_ctx(req));
271}
272
273static int shash_async_final(struct ahash_request *req)
274{
275 return crypto_shash_final(ahash_request_ctx(req), req->result);
276}
277
278int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
279{
280 struct crypto_hash_walk walk;
281 int nbytes;
282
283 nbytes = crypto_hash_walk_first(req, &walk);
284 if (!nbytes)
285 return crypto_shash_final(desc, req->result);
286
287 do {
288 nbytes = crypto_hash_walk_last(&walk) ?
289 crypto_shash_finup(desc, walk.data, nbytes,
290 req->result) :
291 crypto_shash_update(desc, walk.data, nbytes);
292 nbytes = crypto_hash_walk_done(&walk, nbytes);
293 } while (nbytes > 0);
294
295 return nbytes;
296}
297EXPORT_SYMBOL_GPL(shash_ahash_finup);
298
299static int shash_async_finup(struct ahash_request *req)
300{
301 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
302 struct shash_desc *desc = ahash_request_ctx(req);
303
304 desc->tfm = *ctx;
305
306 return shash_ahash_finup(req, desc);
307}
308
309int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
310{
311 unsigned int nbytes = req->nbytes;
312 struct scatterlist *sg;
313 unsigned int offset;
314 int err;
315
316 if (nbytes &&
317 (sg = req->src, offset = sg->offset,
318 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
319 void *data;
320
321 data = kmap_atomic(sg_page(sg));
322 err = crypto_shash_digest(desc, data + offset, nbytes,
323 req->result);
324 kunmap_atomic(data);
325 } else
326 err = crypto_shash_init(desc) ?:
327 shash_ahash_finup(req, desc);
328
329 return err;
330}
331EXPORT_SYMBOL_GPL(shash_ahash_digest);
332
333static int shash_async_digest(struct ahash_request *req)
334{
335 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
336 struct shash_desc *desc = ahash_request_ctx(req);
337
338 desc->tfm = *ctx;
339
340 return shash_ahash_digest(req, desc);
341}
342
343static int shash_async_export(struct ahash_request *req, void *out)
344{
345 return crypto_shash_export(ahash_request_ctx(req), out);
346}
347
348static int shash_async_import(struct ahash_request *req, const void *in)
349{
350 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
351 struct shash_desc *desc = ahash_request_ctx(req);
352
353 desc->tfm = *ctx;
354
355 return crypto_shash_import(desc, in);
356}
357
358static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
359{
360 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
361
362 crypto_free_shash(*ctx);
363}
364
365int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
366{
367 struct crypto_alg *calg = tfm->__crt_alg;
368 struct shash_alg *alg = __crypto_shash_alg(calg);
369 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
370 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
371 struct crypto_shash *shash;
372
373 if (!crypto_mod_get(calg))
374 return -EAGAIN;
375
376 shash = crypto_create_tfm(calg, &crypto_shash_type);
377 if (IS_ERR(shash)) {
378 crypto_mod_put(calg);
379 return PTR_ERR(shash);
380 }
381
382 *ctx = shash;
383 tfm->exit = crypto_exit_shash_ops_async;
384
385 crt->init = shash_async_init;
386 crt->update = shash_async_update;
387 crt->final = shash_async_final;
388 crt->finup = shash_async_finup;
389 crt->digest = shash_async_digest;
390 if (crypto_shash_alg_has_setkey(alg))
391 crt->setkey = shash_async_setkey;
392
393 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
394 CRYPTO_TFM_NEED_KEY);
395
396 crt->export = shash_async_export;
397 crt->import = shash_async_import;
398
399 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
400
401 return 0;
402}
403
404static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
405{
406 struct crypto_shash *hash = __crypto_shash_cast(tfm);
407 struct shash_alg *alg = crypto_shash_alg(hash);
408
409 alg->exit_tfm(hash);
410}
411
412static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
413{
414 struct crypto_shash *hash = __crypto_shash_cast(tfm);
415 struct shash_alg *alg = crypto_shash_alg(hash);
416 int err;
417
418 hash->descsize = alg->descsize;
419
420 shash_set_needkey(hash, alg);
421
422 if (alg->exit_tfm)
423 tfm->exit = crypto_shash_exit_tfm;
424
425 if (!alg->init_tfm)
426 return 0;
427
428 err = alg->init_tfm(hash);
429 if (err)
430 return err;
431
432 /* ->init_tfm() may have increased the descsize. */
433 if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
434 if (alg->exit_tfm)
435 alg->exit_tfm(hash);
436 return -EINVAL;
437 }
438
439 return 0;
440}
441
442static void crypto_shash_free_instance(struct crypto_instance *inst)
443{
444 struct shash_instance *shash = shash_instance(inst);
445
446 shash->free(shash);
447}
448
449#ifdef CONFIG_NET
450static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
451{
452 struct crypto_report_hash rhash;
453 struct shash_alg *salg = __crypto_shash_alg(alg);
454
455 memset(&rhash, 0, sizeof(rhash));
456
457 strscpy(rhash.type, "shash", sizeof(rhash.type));
458
459 rhash.blocksize = alg->cra_blocksize;
460 rhash.digestsize = salg->digestsize;
461
462 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
463}
464#else
465static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
466{
467 return -ENOSYS;
468}
469#endif
470
471static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
472 __maybe_unused;
473static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
474{
475 struct shash_alg *salg = __crypto_shash_alg(alg);
476
477 seq_printf(m, "type : shash\n");
478 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
479 seq_printf(m, "digestsize : %u\n", salg->digestsize);
480}
481
482static const struct crypto_type crypto_shash_type = {
483 .extsize = crypto_alg_extsize,
484 .init_tfm = crypto_shash_init_tfm,
485 .free = crypto_shash_free_instance,
486#ifdef CONFIG_PROC_FS
487 .show = crypto_shash_show,
488#endif
489 .report = crypto_shash_report,
490 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
491 .maskset = CRYPTO_ALG_TYPE_MASK,
492 .type = CRYPTO_ALG_TYPE_SHASH,
493 .tfmsize = offsetof(struct crypto_shash, base),
494};
495
496int crypto_grab_shash(struct crypto_shash_spawn *spawn,
497 struct crypto_instance *inst,
498 const char *name, u32 type, u32 mask)
499{
500 spawn->base.frontend = &crypto_shash_type;
501 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
502}
503EXPORT_SYMBOL_GPL(crypto_grab_shash);
504
505struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
506 u32 mask)
507{
508 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
509}
510EXPORT_SYMBOL_GPL(crypto_alloc_shash);
511
512static int shash_prepare_alg(struct shash_alg *alg)
513{
514 struct crypto_alg *base = &alg->base;
515
516 if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
517 alg->descsize > HASH_MAX_DESCSIZE ||
518 alg->statesize > HASH_MAX_STATESIZE)
519 return -EINVAL;
520
521 if ((alg->export && !alg->import) || (alg->import && !alg->export))
522 return -EINVAL;
523
524 base->cra_type = &crypto_shash_type;
525 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
526 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
527
528 if (!alg->finup)
529 alg->finup = shash_finup_unaligned;
530 if (!alg->digest)
531 alg->digest = shash_digest_unaligned;
532 if (!alg->export) {
533 alg->export = shash_default_export;
534 alg->import = shash_default_import;
535 alg->statesize = alg->descsize;
536 }
537 if (!alg->setkey)
538 alg->setkey = shash_no_setkey;
539
540 return 0;
541}
542
543int crypto_register_shash(struct shash_alg *alg)
544{
545 struct crypto_alg *base = &alg->base;
546 int err;
547
548 err = shash_prepare_alg(alg);
549 if (err)
550 return err;
551
552 return crypto_register_alg(base);
553}
554EXPORT_SYMBOL_GPL(crypto_register_shash);
555
556void crypto_unregister_shash(struct shash_alg *alg)
557{
558 crypto_unregister_alg(&alg->base);
559}
560EXPORT_SYMBOL_GPL(crypto_unregister_shash);
561
562int crypto_register_shashes(struct shash_alg *algs, int count)
563{
564 int i, ret;
565
566 for (i = 0; i < count; i++) {
567 ret = crypto_register_shash(&algs[i]);
568 if (ret)
569 goto err;
570 }
571
572 return 0;
573
574err:
575 for (--i; i >= 0; --i)
576 crypto_unregister_shash(&algs[i]);
577
578 return ret;
579}
580EXPORT_SYMBOL_GPL(crypto_register_shashes);
581
582void crypto_unregister_shashes(struct shash_alg *algs, int count)
583{
584 int i;
585
586 for (i = count - 1; i >= 0; --i)
587 crypto_unregister_shash(&algs[i]);
588}
589EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
590
591int shash_register_instance(struct crypto_template *tmpl,
592 struct shash_instance *inst)
593{
594 int err;
595
596 if (WARN_ON(!inst->free))
597 return -EINVAL;
598
599 err = shash_prepare_alg(&inst->alg);
600 if (err)
601 return err;
602
603 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
604}
605EXPORT_SYMBOL_GPL(shash_register_instance);
606
607void shash_free_singlespawn_instance(struct shash_instance *inst)
608{
609 crypto_drop_spawn(shash_instance_ctx(inst));
610 kfree(inst);
611}
612EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
613
614MODULE_LICENSE("GPL");
615MODULE_DESCRIPTION("Synchronous cryptographic hash type");