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