rwsem: fix commas in initialisation
[linux-2.6-microblaze.git] / crypto / shash.c
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 static const struct crypto_type crypto_shash_type;
22
23 int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
24                     unsigned int keylen)
25 {
26         return -ENOSYS;
27 }
28 EXPORT_SYMBOL_GPL(shash_no_setkey);
29
30 static 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         kzfree(buffer);
48         return err;
49 }
50
51 static 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
57 int 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 }
77 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
78
79 static 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
109 int 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 }
121 EXPORT_SYMBOL_GPL(crypto_shash_update);
122
123 static 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
146 out:
147         memset(buf, 0, ds);
148         return err;
149 }
150
151 int 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 }
162 EXPORT_SYMBOL_GPL(crypto_shash_final);
163
164 static 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
171 int 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 }
183 EXPORT_SYMBOL_GPL(crypto_shash_finup);
184
185 static 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
192 int 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 }
207 EXPORT_SYMBOL_GPL(crypto_shash_digest);
208
209 int 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 }
223 EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
224
225 static 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
231 static 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
237 static 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
245 static 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
255 int 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 }
266 EXPORT_SYMBOL_GPL(shash_ahash_update);
267
268 static int shash_async_update(struct ahash_request *req)
269 {
270         return shash_ahash_update(req, ahash_request_ctx(req));
271 }
272
273 static int shash_async_final(struct ahash_request *req)
274 {
275         return crypto_shash_final(ahash_request_ctx(req), req->result);
276 }
277
278 int 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 }
297 EXPORT_SYMBOL_GPL(shash_ahash_finup);
298
299 static 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
309 int 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 }
331 EXPORT_SYMBOL_GPL(shash_ahash_digest);
332
333 static 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
343 static int shash_async_export(struct ahash_request *req, void *out)
344 {
345         return crypto_shash_export(ahash_request_ctx(req), out);
346 }
347
348 static 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
358 static 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
365 int 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
404 static 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
412 static 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
442 static 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
450 static 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
465 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
466 {
467         return -ENOSYS;
468 }
469 #endif
470
471 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
472         __maybe_unused;
473 static 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
482 static 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
496 int 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 }
503 EXPORT_SYMBOL_GPL(crypto_grab_shash);
504
505 struct 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 }
510 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
511
512 static 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
543 int 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 }
554 EXPORT_SYMBOL_GPL(crypto_register_shash);
555
556 void crypto_unregister_shash(struct shash_alg *alg)
557 {
558         crypto_unregister_alg(&alg->base);
559 }
560 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
561
562 int 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
574 err:
575         for (--i; i >= 0; --i)
576                 crypto_unregister_shash(&algs[i]);
577
578         return ret;
579 }
580 EXPORT_SYMBOL_GPL(crypto_register_shashes);
581
582 void 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 }
589 EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
590
591 int 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 }
605 EXPORT_SYMBOL_GPL(shash_register_instance);
606
607 void shash_free_singlespawn_instance(struct shash_instance *inst)
608 {
609         crypto_drop_spawn(shash_instance_ctx(inst));
610         kfree(inst);
611 }
612 EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
613
614 MODULE_LICENSE("GPL");
615 MODULE_DESCRIPTION("Synchronous cryptographic hash type");