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
shash_no_setkey(struct crypto_shash * tfm,const u8 * key,unsigned int keylen)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
shash_setkey_unaligned(struct crypto_shash * tfm,const u8 * key,unsigned int keylen)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
shash_set_needkey(struct crypto_shash * tfm,struct shash_alg * alg)51 static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
52 {
53 if (crypto_shash_alg_has_setkey(alg) &&
54 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
55 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
56 }
57
crypto_shash_setkey(struct crypto_shash * tfm,const u8 * key,unsigned int keylen)58 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
59 unsigned int keylen)
60 {
61 struct shash_alg *shash = crypto_shash_alg(tfm);
62 unsigned long alignmask = crypto_shash_alignmask(tfm);
63 int err;
64
65 if ((unsigned long)key & alignmask)
66 err = shash_setkey_unaligned(tfm, key, keylen);
67 else
68 err = shash->setkey(tfm, key, keylen);
69
70 if (unlikely(err)) {
71 shash_set_needkey(tfm, shash);
72 return err;
73 }
74
75 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
76 return 0;
77 }
78 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
79
shash_update_unaligned(struct shash_desc * desc,const u8 * data,unsigned int len)80 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
81 unsigned int len)
82 {
83 struct crypto_shash *tfm = desc->tfm;
84 struct shash_alg *shash = crypto_shash_alg(tfm);
85 unsigned long alignmask = crypto_shash_alignmask(tfm);
86 unsigned int unaligned_len = alignmask + 1 -
87 ((unsigned long)data & alignmask);
88 /*
89 * We cannot count on __aligned() working for large values:
90 * https://patchwork.kernel.org/patch/9507697/
91 */
92 u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
93 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
94 int err;
95
96 if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
97 return -EINVAL;
98
99 if (unaligned_len > len)
100 unaligned_len = len;
101
102 memcpy(buf, data, unaligned_len);
103 err = shash->update(desc, buf, unaligned_len);
104 memset(buf, 0, unaligned_len);
105
106 return err ?:
107 shash->update(desc, data + unaligned_len, len - unaligned_len);
108 }
109
crypto_shash_update(struct shash_desc * desc,const u8 * data,unsigned int len)110 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
111 unsigned int len)
112 {
113 struct crypto_shash *tfm = desc->tfm;
114 struct shash_alg *shash = crypto_shash_alg(tfm);
115 unsigned long alignmask = crypto_shash_alignmask(tfm);
116
117 if ((unsigned long)data & alignmask)
118 return shash_update_unaligned(desc, data, len);
119
120 return shash->update(desc, data, len);
121 }
122 EXPORT_SYMBOL_GPL(crypto_shash_update);
123
shash_final_unaligned(struct shash_desc * desc,u8 * out)124 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
125 {
126 struct crypto_shash *tfm = desc->tfm;
127 unsigned long alignmask = crypto_shash_alignmask(tfm);
128 struct shash_alg *shash = crypto_shash_alg(tfm);
129 unsigned int ds = crypto_shash_digestsize(tfm);
130 /*
131 * We cannot count on __aligned() working for large values:
132 * https://patchwork.kernel.org/patch/9507697/
133 */
134 u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
135 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
136 int err;
137
138 if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
139 return -EINVAL;
140
141 err = shash->final(desc, buf);
142 if (err)
143 goto out;
144
145 memcpy(out, buf, ds);
146
147 out:
148 memset(buf, 0, ds);
149 return err;
150 }
151
crypto_shash_final(struct shash_desc * desc,u8 * out)152 int crypto_shash_final(struct shash_desc *desc, u8 *out)
153 {
154 struct crypto_shash *tfm = desc->tfm;
155 struct shash_alg *shash = crypto_shash_alg(tfm);
156 unsigned long alignmask = crypto_shash_alignmask(tfm);
157
158 if ((unsigned long)out & alignmask)
159 return shash_final_unaligned(desc, out);
160
161 return shash->final(desc, out);
162 }
163 EXPORT_SYMBOL_GPL(crypto_shash_final);
164
shash_finup_unaligned(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)165 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
166 unsigned int len, u8 *out)
167 {
168 return crypto_shash_update(desc, data, len) ?:
169 crypto_shash_final(desc, out);
170 }
171
crypto_shash_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)172 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
173 unsigned int len, u8 *out)
174 {
175 struct crypto_shash *tfm = desc->tfm;
176 struct shash_alg *shash = crypto_shash_alg(tfm);
177 unsigned long alignmask = crypto_shash_alignmask(tfm);
178
179 if (((unsigned long)data | (unsigned long)out) & alignmask)
180 return shash_finup_unaligned(desc, data, len, out);
181
182 return shash->finup(desc, data, len, out);
183 }
184 EXPORT_SYMBOL_GPL(crypto_shash_finup);
185
shash_digest_unaligned(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)186 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
187 unsigned int len, u8 *out)
188 {
189 return crypto_shash_init(desc) ?:
190 crypto_shash_finup(desc, data, len, out);
191 }
192
crypto_shash_digest(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)193 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
194 unsigned int len, u8 *out)
195 {
196 struct crypto_shash *tfm = desc->tfm;
197 struct shash_alg *shash = crypto_shash_alg(tfm);
198 unsigned long alignmask = crypto_shash_alignmask(tfm);
199
200 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
201 return -ENOKEY;
202
203 if (((unsigned long)data | (unsigned long)out) & alignmask)
204 return shash_digest_unaligned(desc, data, len, out);
205
206 return shash->digest(desc, data, len, out);
207 }
208 EXPORT_SYMBOL_GPL(crypto_shash_digest);
209
shash_default_export(struct shash_desc * desc,void * out)210 static int shash_default_export(struct shash_desc *desc, void *out)
211 {
212 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
213 return 0;
214 }
215
shash_default_import(struct shash_desc * desc,const void * in)216 static int shash_default_import(struct shash_desc *desc, const void *in)
217 {
218 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
219 return 0;
220 }
221
shash_async_setkey(struct crypto_ahash * tfm,const u8 * key,unsigned int keylen)222 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
223 unsigned int keylen)
224 {
225 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
226
227 return crypto_shash_setkey(*ctx, key, keylen);
228 }
229
shash_async_init(struct ahash_request * req)230 static int shash_async_init(struct ahash_request *req)
231 {
232 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
233 struct shash_desc *desc = ahash_request_ctx(req);
234
235 desc->tfm = *ctx;
236
237 return crypto_shash_init(desc);
238 }
239
shash_ahash_update(struct ahash_request * req,struct shash_desc * desc)240 int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
241 {
242 struct crypto_hash_walk walk;
243 int nbytes;
244
245 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
246 nbytes = crypto_hash_walk_done(&walk, nbytes))
247 nbytes = crypto_shash_update(desc, walk.data, nbytes);
248
249 return nbytes;
250 }
251 EXPORT_SYMBOL_GPL(shash_ahash_update);
252
shash_async_update(struct ahash_request * req)253 static int shash_async_update(struct ahash_request *req)
254 {
255 return shash_ahash_update(req, ahash_request_ctx(req));
256 }
257
shash_async_final(struct ahash_request * req)258 static int shash_async_final(struct ahash_request *req)
259 {
260 return crypto_shash_final(ahash_request_ctx(req), req->result);
261 }
262
shash_ahash_finup(struct ahash_request * req,struct shash_desc * desc)263 int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
264 {
265 struct crypto_hash_walk walk;
266 int nbytes;
267
268 nbytes = crypto_hash_walk_first(req, &walk);
269 if (!nbytes)
270 return crypto_shash_final(desc, req->result);
271
272 do {
273 nbytes = crypto_hash_walk_last(&walk) ?
274 crypto_shash_finup(desc, walk.data, nbytes,
275 req->result) :
276 crypto_shash_update(desc, walk.data, nbytes);
277 nbytes = crypto_hash_walk_done(&walk, nbytes);
278 } while (nbytes > 0);
279
280 return nbytes;
281 }
282 EXPORT_SYMBOL_GPL(shash_ahash_finup);
283
shash_async_finup(struct ahash_request * req)284 static int shash_async_finup(struct ahash_request *req)
285 {
286 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
287 struct shash_desc *desc = ahash_request_ctx(req);
288
289 desc->tfm = *ctx;
290
291 return shash_ahash_finup(req, desc);
292 }
293
shash_ahash_digest(struct ahash_request * req,struct shash_desc * desc)294 int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
295 {
296 unsigned int nbytes = req->nbytes;
297 struct scatterlist *sg;
298 unsigned int offset;
299 int err;
300
301 if (nbytes &&
302 (sg = req->src, offset = sg->offset,
303 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
304 void *data;
305
306 data = kmap_atomic(sg_page(sg));
307 err = crypto_shash_digest(desc, data + offset, nbytes,
308 req->result);
309 kunmap_atomic(data);
310 } else
311 err = crypto_shash_init(desc) ?:
312 shash_ahash_finup(req, desc);
313
314 return err;
315 }
316 EXPORT_SYMBOL_GPL(shash_ahash_digest);
317
shash_async_digest(struct ahash_request * req)318 static int shash_async_digest(struct ahash_request *req)
319 {
320 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
321 struct shash_desc *desc = ahash_request_ctx(req);
322
323 desc->tfm = *ctx;
324
325 return shash_ahash_digest(req, desc);
326 }
327
shash_async_export(struct ahash_request * req,void * out)328 static int shash_async_export(struct ahash_request *req, void *out)
329 {
330 return crypto_shash_export(ahash_request_ctx(req), out);
331 }
332
shash_async_import(struct ahash_request * req,const void * in)333 static int shash_async_import(struct ahash_request *req, const void *in)
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 crypto_shash_import(desc, in);
341 }
342
crypto_exit_shash_ops_async(struct crypto_tfm * tfm)343 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
344 {
345 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
346
347 crypto_free_shash(*ctx);
348 }
349
crypto_init_shash_ops_async(struct crypto_tfm * tfm)350 int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
351 {
352 struct crypto_alg *calg = tfm->__crt_alg;
353 struct shash_alg *alg = __crypto_shash_alg(calg);
354 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
355 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
356 struct crypto_shash *shash;
357
358 if (!crypto_mod_get(calg))
359 return -EAGAIN;
360
361 shash = crypto_create_tfm(calg, &crypto_shash_type);
362 if (IS_ERR(shash)) {
363 crypto_mod_put(calg);
364 return PTR_ERR(shash);
365 }
366
367 *ctx = shash;
368 tfm->exit = crypto_exit_shash_ops_async;
369
370 crt->init = shash_async_init;
371 crt->update = shash_async_update;
372 crt->final = shash_async_final;
373 crt->finup = shash_async_finup;
374 crt->digest = shash_async_digest;
375 if (crypto_shash_alg_has_setkey(alg))
376 crt->setkey = shash_async_setkey;
377
378 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
379 CRYPTO_TFM_NEED_KEY);
380
381 crt->export = shash_async_export;
382 crt->import = shash_async_import;
383
384 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
385
386 return 0;
387 }
388
crypto_shash_init_tfm(struct crypto_tfm * tfm)389 static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
390 {
391 struct crypto_shash *hash = __crypto_shash_cast(tfm);
392 struct shash_alg *alg = crypto_shash_alg(hash);
393
394 hash->descsize = alg->descsize;
395
396 shash_set_needkey(hash, alg);
397
398 return 0;
399 }
400
401 #ifdef CONFIG_NET
crypto_shash_report(struct sk_buff * skb,struct crypto_alg * alg)402 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
403 {
404 struct crypto_report_hash rhash;
405 struct shash_alg *salg = __crypto_shash_alg(alg);
406
407 memset(&rhash, 0, sizeof(rhash));
408
409 strscpy(rhash.type, "shash", sizeof(rhash.type));
410
411 rhash.blocksize = alg->cra_blocksize;
412 rhash.digestsize = salg->digestsize;
413
414 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
415 }
416 #else
crypto_shash_report(struct sk_buff * skb,struct crypto_alg * alg)417 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
418 {
419 return -ENOSYS;
420 }
421 #endif
422
423 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
424 __maybe_unused;
crypto_shash_show(struct seq_file * m,struct crypto_alg * alg)425 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
426 {
427 struct shash_alg *salg = __crypto_shash_alg(alg);
428
429 seq_printf(m, "type : shash\n");
430 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
431 seq_printf(m, "digestsize : %u\n", salg->digestsize);
432 }
433
434 static const struct crypto_type crypto_shash_type = {
435 .extsize = crypto_alg_extsize,
436 .init_tfm = crypto_shash_init_tfm,
437 #ifdef CONFIG_PROC_FS
438 .show = crypto_shash_show,
439 #endif
440 .report = crypto_shash_report,
441 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
442 .maskset = CRYPTO_ALG_TYPE_MASK,
443 .type = CRYPTO_ALG_TYPE_SHASH,
444 .tfmsize = offsetof(struct crypto_shash, base),
445 };
446
crypto_alloc_shash(const char * alg_name,u32 type,u32 mask)447 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
448 u32 mask)
449 {
450 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
451 }
452 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
453
shash_prepare_alg(struct shash_alg * alg)454 static int shash_prepare_alg(struct shash_alg *alg)
455 {
456 struct crypto_alg *base = &alg->base;
457
458 if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
459 alg->descsize > HASH_MAX_DESCSIZE ||
460 alg->statesize > HASH_MAX_STATESIZE)
461 return -EINVAL;
462
463 if ((alg->export && !alg->import) || (alg->import && !alg->export))
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
crypto_register_shash(struct shash_alg * alg)485 int 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 }
496 EXPORT_SYMBOL_GPL(crypto_register_shash);
497
crypto_unregister_shash(struct shash_alg * alg)498 int crypto_unregister_shash(struct shash_alg *alg)
499 {
500 return crypto_unregister_alg(&alg->base);
501 }
502 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
503
crypto_register_shashes(struct shash_alg * algs,int count)504 int 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
516 err:
517 for (--i; i >= 0; --i)
518 crypto_unregister_shash(&algs[i]);
519
520 return ret;
521 }
522 EXPORT_SYMBOL_GPL(crypto_register_shashes);
523
crypto_unregister_shashes(struct shash_alg * algs,int count)524 int 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 }
538 EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
539
shash_register_instance(struct crypto_template * tmpl,struct shash_instance * inst)540 int 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 }
551 EXPORT_SYMBOL_GPL(shash_register_instance);
552
shash_free_instance(struct crypto_instance * inst)553 void shash_free_instance(struct crypto_instance *inst)
554 {
555 crypto_drop_spawn(crypto_instance_ctx(inst));
556 kfree(shash_instance(inst));
557 }
558 EXPORT_SYMBOL_GPL(shash_free_instance);
559
crypto_init_shash_spawn(struct crypto_shash_spawn * spawn,struct shash_alg * alg,struct crypto_instance * inst)560 int 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 }
567 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
568
shash_attr_alg(struct rtattr * rta,u32 type,u32 mask)569 struct 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 }
577 EXPORT_SYMBOL_GPL(shash_attr_alg);
578
579 MODULE_LICENSE("GPL");
580 MODULE_DESCRIPTION("Synchronous cryptographic hash type");
581