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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
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");