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path: root/crypto/shash.c (plain)
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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
23#include "internal.h"
24
25static const struct crypto_type crypto_shash_type;
26
27int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
28 unsigned int keylen)
29{
30 return -ENOSYS;
31}
32EXPORT_SYMBOL_GPL(shash_no_setkey);
33
34static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
35 unsigned int keylen)
36{
37 struct shash_alg *shash = crypto_shash_alg(tfm);
38 unsigned long alignmask = crypto_shash_alignmask(tfm);
39 unsigned long absize;
40 u8 *buffer, *alignbuffer;
41 int err;
42
43 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
44 buffer = kmalloc(absize, GFP_ATOMIC);
45 if (!buffer)
46 return -ENOMEM;
47
48 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
49 memcpy(alignbuffer, key, keylen);
50 err = shash->setkey(tfm, alignbuffer, keylen);
51 kzfree(buffer);
52 return err;
53}
54
55static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
56{
57 if (crypto_shash_alg_has_setkey(alg) &&
58 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
59 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
60}
61
62int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
63 unsigned int keylen)
64{
65 struct shash_alg *shash = crypto_shash_alg(tfm);
66 unsigned long alignmask = crypto_shash_alignmask(tfm);
67 int err;
68
69 if ((unsigned long)key & alignmask)
70 err = shash_setkey_unaligned(tfm, key, keylen);
71 else
72 err = shash->setkey(tfm, key, keylen);
73
74 if (unlikely(err)) {
75 shash_set_needkey(tfm, shash);
76 return err;
77 }
78
79 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
80 return 0;
81}
82EXPORT_SYMBOL_GPL(crypto_shash_setkey);
83
84static inline unsigned int shash_align_buffer_size(unsigned len,
85 unsigned long mask)
86{
87 typedef u8 __attribute__ ((aligned)) u8_aligned;
88 return len + (mask & ~(__alignof__(u8_aligned) - 1));
89}
90
91static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
92 unsigned int len)
93{
94 struct crypto_shash *tfm = desc->tfm;
95 struct shash_alg *shash = crypto_shash_alg(tfm);
96 unsigned long alignmask = crypto_shash_alignmask(tfm);
97 unsigned int unaligned_len = alignmask + 1 -
98 ((unsigned long)data & alignmask);
99 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
100 __attribute__ ((aligned));
101 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
102 int err;
103
104 if (unaligned_len > len)
105 unaligned_len = len;
106
107 memcpy(buf, data, unaligned_len);
108 err = shash->update(desc, buf, unaligned_len);
109 memset(buf, 0, unaligned_len);
110
111 return err ?:
112 shash->update(desc, data + unaligned_len, len - unaligned_len);
113}
114
115int crypto_shash_update(struct shash_desc *desc, const u8 *data,
116 unsigned int len)
117{
118 struct crypto_shash *tfm = desc->tfm;
119 struct shash_alg *shash = crypto_shash_alg(tfm);
120 unsigned long alignmask = crypto_shash_alignmask(tfm);
121
122 if ((unsigned long)data & alignmask)
123 return shash_update_unaligned(desc, data, len);
124
125 return shash->update(desc, data, len);
126}
127EXPORT_SYMBOL_GPL(crypto_shash_update);
128
129static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
130{
131 struct crypto_shash *tfm = desc->tfm;
132 unsigned long alignmask = crypto_shash_alignmask(tfm);
133 struct shash_alg *shash = crypto_shash_alg(tfm);
134 unsigned int ds = crypto_shash_digestsize(tfm);
135 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
136 __attribute__ ((aligned));
137 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
138 int err;
139
140 err = shash->final(desc, buf);
141 if (err)
142 goto out;
143
144 memcpy(out, buf, ds);
145
146out:
147 memset(buf, 0, ds);
148 return err;
149}
150
151int crypto_shash_final(struct shash_desc *desc, u8 *out)
152{
153 struct crypto_shash *tfm = desc->tfm;
154 struct shash_alg *shash = crypto_shash_alg(tfm);
155 unsigned long alignmask = crypto_shash_alignmask(tfm);
156
157 if ((unsigned long)out & alignmask)
158 return shash_final_unaligned(desc, out);
159
160 return shash->final(desc, out);
161}
162EXPORT_SYMBOL_GPL(crypto_shash_final);
163
164static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
165 unsigned int len, u8 *out)
166{
167 return crypto_shash_update(desc, data, len) ?:
168 crypto_shash_final(desc, out);
169}
170
171int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
172 unsigned int len, u8 *out)
173{
174 struct crypto_shash *tfm = desc->tfm;
175 struct shash_alg *shash = crypto_shash_alg(tfm);
176 unsigned long alignmask = crypto_shash_alignmask(tfm);
177
178 if (((unsigned long)data | (unsigned long)out) & alignmask)
179 return shash_finup_unaligned(desc, data, len, out);
180
181 return shash->finup(desc, data, len, out);
182}
183EXPORT_SYMBOL_GPL(crypto_shash_finup);
184
185static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
186 unsigned int len, u8 *out)
187{
188 return crypto_shash_init(desc) ?:
189 crypto_shash_finup(desc, data, len, out);
190}
191
192int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
193 unsigned int len, u8 *out)
194{
195 struct crypto_shash *tfm = desc->tfm;
196 struct shash_alg *shash = crypto_shash_alg(tfm);
197 unsigned long alignmask = crypto_shash_alignmask(tfm);
198
199 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
200 return -ENOKEY;
201
202 if (((unsigned long)data | (unsigned long)out) & alignmask)
203 return shash_digest_unaligned(desc, data, len, out);
204
205 return shash->digest(desc, data, len, out);
206}
207EXPORT_SYMBOL_GPL(crypto_shash_digest);
208
209static int shash_default_export(struct shash_desc *desc, void *out)
210{
211 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
212 return 0;
213}
214
215static int shash_default_import(struct shash_desc *desc, const void *in)
216{
217 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
218 return 0;
219}
220
221static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
222 unsigned int keylen)
223{
224 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
225
226 return crypto_shash_setkey(*ctx, key, keylen);
227}
228
229static int shash_async_init(struct ahash_request *req)
230{
231 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
232 struct shash_desc *desc = ahash_request_ctx(req);
233
234 desc->tfm = *ctx;
235 desc->flags = req->base.flags;
236
237 return crypto_shash_init(desc);
238}
239
240int 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}
251EXPORT_SYMBOL_GPL(shash_ahash_update);
252
253static int shash_async_update(struct ahash_request *req)
254{
255 return shash_ahash_update(req, ahash_request_ctx(req));
256}
257
258static int shash_async_final(struct ahash_request *req)
259{
260 return crypto_shash_final(ahash_request_ctx(req), req->result);
261}
262
263int 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}
282EXPORT_SYMBOL_GPL(shash_ahash_finup);
283
284static 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 desc->flags = req->base.flags;
291
292 return shash_ahash_finup(req, desc);
293}
294
295int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
296{
297 unsigned int nbytes = req->nbytes;
298 struct scatterlist *sg;
299 unsigned int offset;
300 int err;
301
302 if (nbytes &&
303 (sg = req->src, offset = sg->offset,
304 nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
305 void *data;
306
307 data = kmap_atomic(sg_page(sg));
308 err = crypto_shash_digest(desc, data + offset, nbytes,
309 req->result);
310 kunmap_atomic(data);
311 crypto_yield(desc->flags);
312 } else
313 err = crypto_shash_init(desc) ?:
314 shash_ahash_finup(req, desc);
315
316 return err;
317}
318EXPORT_SYMBOL_GPL(shash_ahash_digest);
319
320static int shash_async_digest(struct ahash_request *req)
321{
322 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
323 struct shash_desc *desc = ahash_request_ctx(req);
324
325 desc->tfm = *ctx;
326 desc->flags = req->base.flags;
327
328 return shash_ahash_digest(req, desc);
329}
330
331static int shash_async_export(struct ahash_request *req, void *out)
332{
333 return crypto_shash_export(ahash_request_ctx(req), out);
334}
335
336static int shash_async_import(struct ahash_request *req, const void *in)
337{
338 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
339 struct shash_desc *desc = ahash_request_ctx(req);
340
341 desc->tfm = *ctx;
342 desc->flags = req->base.flags;
343
344 return crypto_shash_import(desc, in);
345}
346
347static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
348{
349 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
350
351 crypto_free_shash(*ctx);
352}
353
354int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
355{
356 struct crypto_alg *calg = tfm->__crt_alg;
357 struct shash_alg *alg = __crypto_shash_alg(calg);
358 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
359 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
360 struct crypto_shash *shash;
361
362 if (!crypto_mod_get(calg))
363 return -EAGAIN;
364
365 shash = crypto_create_tfm(calg, &crypto_shash_type);
366 if (IS_ERR(shash)) {
367 crypto_mod_put(calg);
368 return PTR_ERR(shash);
369 }
370
371 *ctx = shash;
372 tfm->exit = crypto_exit_shash_ops_async;
373
374 crt->init = shash_async_init;
375 crt->update = shash_async_update;
376 crt->final = shash_async_final;
377 crt->finup = shash_async_finup;
378 crt->digest = shash_async_digest;
379 if (crypto_shash_alg_has_setkey(alg))
380 crt->setkey = shash_async_setkey;
381
382 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
383 CRYPTO_TFM_NEED_KEY);
384
385 if (alg->export)
386 crt->export = shash_async_export;
387 if (alg->import)
388 crt->import = shash_async_import;
389
390 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
391
392 return 0;
393}
394
395static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
396{
397 struct crypto_shash *hash = __crypto_shash_cast(tfm);
398 struct shash_alg *alg = crypto_shash_alg(hash);
399
400 hash->descsize = alg->descsize;
401
402 shash_set_needkey(hash, alg);
403
404 return 0;
405}
406
407#ifdef CONFIG_NET
408static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
409{
410 struct crypto_report_hash rhash;
411 struct shash_alg *salg = __crypto_shash_alg(alg);
412
413 strncpy(rhash.type, "shash", sizeof(rhash.type));
414
415 rhash.blocksize = alg->cra_blocksize;
416 rhash.digestsize = salg->digestsize;
417
418 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
419 sizeof(struct crypto_report_hash), &rhash))
420 goto nla_put_failure;
421 return 0;
422
423nla_put_failure:
424 return -EMSGSIZE;
425}
426#else
427static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
428{
429 return -ENOSYS;
430}
431#endif
432
433static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
434 __attribute__ ((unused));
435static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
436{
437 struct shash_alg *salg = __crypto_shash_alg(alg);
438
439 seq_printf(m, "type : shash\n");
440 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
441 seq_printf(m, "digestsize : %u\n", salg->digestsize);
442}
443
444static const struct crypto_type crypto_shash_type = {
445 .extsize = crypto_alg_extsize,
446 .init_tfm = crypto_shash_init_tfm,
447#ifdef CONFIG_PROC_FS
448 .show = crypto_shash_show,
449#endif
450 .report = crypto_shash_report,
451 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
452 .maskset = CRYPTO_ALG_TYPE_MASK,
453 .type = CRYPTO_ALG_TYPE_SHASH,
454 .tfmsize = offsetof(struct crypto_shash, base),
455};
456
457struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
458 u32 mask)
459{
460 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
461}
462EXPORT_SYMBOL_GPL(crypto_alloc_shash);
463
464static int shash_prepare_alg(struct shash_alg *alg)
465{
466 struct crypto_alg *base = &alg->base;
467
468 if (alg->digestsize > PAGE_SIZE / 8 ||
469 alg->descsize > PAGE_SIZE / 8 ||
470 alg->statesize > PAGE_SIZE / 8)
471 return -EINVAL;
472
473 base->cra_type = &crypto_shash_type;
474 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
475 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
476
477 if (!alg->finup)
478 alg->finup = shash_finup_unaligned;
479 if (!alg->digest)
480 alg->digest = shash_digest_unaligned;
481 if (!alg->export) {
482 alg->export = shash_default_export;
483 alg->import = shash_default_import;
484 alg->statesize = alg->descsize;
485 }
486 if (!alg->setkey)
487 alg->setkey = shash_no_setkey;
488
489 return 0;
490}
491
492int crypto_register_shash(struct shash_alg *alg)
493{
494 struct crypto_alg *base = &alg->base;
495 int err;
496
497 err = shash_prepare_alg(alg);
498 if (err)
499 return err;
500
501 return crypto_register_alg(base);
502}
503EXPORT_SYMBOL_GPL(crypto_register_shash);
504
505int crypto_unregister_shash(struct shash_alg *alg)
506{
507 return crypto_unregister_alg(&alg->base);
508}
509EXPORT_SYMBOL_GPL(crypto_unregister_shash);
510
511int crypto_register_shashes(struct shash_alg *algs, int count)
512{
513 int i, ret;
514
515 for (i = 0; i < count; i++) {
516 ret = crypto_register_shash(&algs[i]);
517 if (ret)
518 goto err;
519 }
520
521 return 0;
522
523err:
524 for (--i; i >= 0; --i)
525 crypto_unregister_shash(&algs[i]);
526
527 return ret;
528}
529EXPORT_SYMBOL_GPL(crypto_register_shashes);
530
531int crypto_unregister_shashes(struct shash_alg *algs, int count)
532{
533 int i, ret;
534
535 for (i = count - 1; i >= 0; --i) {
536 ret = crypto_unregister_shash(&algs[i]);
537 if (ret)
538 pr_err("Failed to unregister %s %s: %d\n",
539 algs[i].base.cra_driver_name,
540 algs[i].base.cra_name, ret);
541 }
542
543 return 0;
544}
545EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
546
547int shash_register_instance(struct crypto_template *tmpl,
548 struct shash_instance *inst)
549{
550 int err;
551
552 err = shash_prepare_alg(&inst->alg);
553 if (err)
554 return err;
555
556 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
557}
558EXPORT_SYMBOL_GPL(shash_register_instance);
559
560void shash_free_instance(struct crypto_instance *inst)
561{
562 crypto_drop_spawn(crypto_instance_ctx(inst));
563 kfree(shash_instance(inst));
564}
565EXPORT_SYMBOL_GPL(shash_free_instance);
566
567int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
568 struct shash_alg *alg,
569 struct crypto_instance *inst)
570{
571 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
572 &crypto_shash_type);
573}
574EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
575
576struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
577{
578 struct crypto_alg *alg;
579
580 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
581 return IS_ERR(alg) ? ERR_CAST(alg) :
582 container_of(alg, struct shash_alg, base);
583}
584EXPORT_SYMBOL_GPL(shash_attr_alg);
585
586MODULE_LICENSE("GPL");
587MODULE_DESCRIPTION("Synchronous cryptographic hash type");
588
generated by cgit at 2024-05-19 00:14:11 (GMT)