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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/*
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
27static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
28 unsigned int keylen)
29{
30 return -ENOSYS;
31}
32
33static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
34 unsigned int keylen)
35{
36 struct shash_alg *shash = crypto_shash_alg(tfm);
37 unsigned long alignmask = crypto_shash_alignmask(tfm);
38 unsigned long absize;
39 u8 *buffer, *alignbuffer;
40 int err;
41
42 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
43 buffer = kmalloc(absize, GFP_KERNEL);
44 if (!buffer)
45 return -ENOMEM;
46
47 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
48 memcpy(alignbuffer, key, keylen);
49 err = shash->setkey(tfm, alignbuffer, keylen);
50 kzfree(buffer);
51 return err;
52}
53
54int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
55 unsigned int keylen)
56{
57 struct shash_alg *shash = crypto_shash_alg(tfm);
58 unsigned long alignmask = crypto_shash_alignmask(tfm);
59
60 if ((unsigned long)key & alignmask)
61 return shash_setkey_unaligned(tfm, key, keylen);
62
63 return shash->setkey(tfm, key, keylen);
64}
65EXPORT_SYMBOL_GPL(crypto_shash_setkey);
66
67static inline unsigned int shash_align_buffer_size(unsigned len,
68 unsigned long mask)
69{
70 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
71}
72
73static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
74 unsigned int len)
75{
76 struct crypto_shash *tfm = desc->tfm;
77 struct shash_alg *shash = crypto_shash_alg(tfm);
78 unsigned long alignmask = crypto_shash_alignmask(tfm);
79 unsigned int unaligned_len = alignmask + 1 -
80 ((unsigned long)data & alignmask);
81 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
82 __attribute__ ((aligned));
83 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
84 int err;
85
86 if (unaligned_len > len)
87 unaligned_len = len;
88
89 memcpy(buf, data, unaligned_len);
90 err = shash->update(desc, buf, unaligned_len);
91 memset(buf, 0, unaligned_len);
92
93 return err ?:
94 shash->update(desc, data + unaligned_len, len - unaligned_len);
95}
96
97int crypto_shash_update(struct shash_desc *desc, const u8 *data,
98 unsigned int len)
99{
100 struct crypto_shash *tfm = desc->tfm;
101 struct shash_alg *shash = crypto_shash_alg(tfm);
102 unsigned long alignmask = crypto_shash_alignmask(tfm);
103
104 if ((unsigned long)data & alignmask)
105 return shash_update_unaligned(desc, data, len);
106
107 return shash->update(desc, data, len);
108}
109EXPORT_SYMBOL_GPL(crypto_shash_update);
110
111static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
112{
113 struct crypto_shash *tfm = desc->tfm;
114 unsigned long alignmask = crypto_shash_alignmask(tfm);
115 struct shash_alg *shash = crypto_shash_alg(tfm);
116 unsigned int ds = crypto_shash_digestsize(tfm);
117 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
118 __attribute__ ((aligned));
119 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
120 int err;
121
122 err = shash->final(desc, buf);
123 if (err)
124 goto out;
125
126 memcpy(out, buf, ds);
127
128out:
129 memset(buf, 0, ds);
130 return err;
131}
132
133int crypto_shash_final(struct shash_desc *desc, u8 *out)
134{
135 struct crypto_shash *tfm = desc->tfm;
136 struct shash_alg *shash = crypto_shash_alg(tfm);
137 unsigned long alignmask = crypto_shash_alignmask(tfm);
138
139 if ((unsigned long)out & alignmask)
140 return shash_final_unaligned(desc, out);
141
142 return shash->final(desc, out);
143}
144EXPORT_SYMBOL_GPL(crypto_shash_final);
145
146static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
147 unsigned int len, u8 *out)
148{
149 return crypto_shash_update(desc, data, len) ?:
150 crypto_shash_final(desc, out);
151}
152
153int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
154 unsigned int len, u8 *out)
155{
156 struct crypto_shash *tfm = desc->tfm;
157 struct shash_alg *shash = crypto_shash_alg(tfm);
158 unsigned long alignmask = crypto_shash_alignmask(tfm);
159
160 if (((unsigned long)data | (unsigned long)out) & alignmask)
161 return shash_finup_unaligned(desc, data, len, out);
162
163 return shash->finup(desc, data, len, out);
164}
165EXPORT_SYMBOL_GPL(crypto_shash_finup);
166
167static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
168 unsigned int len, u8 *out)
169{
170 return crypto_shash_init(desc) ?:
171 crypto_shash_finup(desc, data, len, out);
172}
173
174int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
175 unsigned int len, u8 *out)
176{
177 struct crypto_shash *tfm = desc->tfm;
178 struct shash_alg *shash = crypto_shash_alg(tfm);
179 unsigned long alignmask = crypto_shash_alignmask(tfm);
180
181 if (((unsigned long)data | (unsigned long)out) & alignmask)
182 return shash_digest_unaligned(desc, data, len, out);
183
184 return shash->digest(desc, data, len, out);
185}
186EXPORT_SYMBOL_GPL(crypto_shash_digest);
187
188static int shash_default_export(struct shash_desc *desc, void *out)
189{
190 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
191 return 0;
192}
193
194static int shash_default_import(struct shash_desc *desc, const void *in)
195{
196 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
197 return 0;
198}
199
200static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
201 unsigned int keylen)
202{
203 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
204
205 return crypto_shash_setkey(*ctx, key, keylen);
206}
207
208static int shash_async_init(struct ahash_request *req)
209{
210 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
211 struct shash_desc *desc = ahash_request_ctx(req);
212
213 desc->tfm = *ctx;
214 desc->flags = req->base.flags;
215
216 return crypto_shash_init(desc);
217}
218
219int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
220{
221 struct crypto_hash_walk walk;
222 int nbytes;
223
224 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
225 nbytes = crypto_hash_walk_done(&walk, nbytes))
226 nbytes = crypto_shash_update(desc, walk.data, nbytes);
227
228 return nbytes;
229}
230EXPORT_SYMBOL_GPL(shash_ahash_update);
231
232static int shash_async_update(struct ahash_request *req)
233{
234 return shash_ahash_update(req, ahash_request_ctx(req));
235}
236
237static int shash_async_final(struct ahash_request *req)
238{
239 return crypto_shash_final(ahash_request_ctx(req), req->result);
240}
241
242int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
243{
244 struct crypto_hash_walk walk;
245 int nbytes;
246
247 nbytes = crypto_hash_walk_first(req, &walk);
248 if (!nbytes)
249 return crypto_shash_final(desc, req->result);
250
251 do {
252 nbytes = crypto_hash_walk_last(&walk) ?
253 crypto_shash_finup(desc, walk.data, nbytes,
254 req->result) :
255 crypto_shash_update(desc, walk.data, nbytes);
256 nbytes = crypto_hash_walk_done(&walk, nbytes);
257 } while (nbytes > 0);
258
259 return nbytes;
260}
261EXPORT_SYMBOL_GPL(shash_ahash_finup);
262
263static int shash_async_finup(struct ahash_request *req)
264{
265 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
266 struct shash_desc *desc = ahash_request_ctx(req);
267
268 desc->tfm = *ctx;
269 desc->flags = req->base.flags;
270
271 return shash_ahash_finup(req, desc);
272}
273
274int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
275{
276 struct scatterlist *sg = req->src;
277 unsigned int offset = sg->offset;
278 unsigned int nbytes = req->nbytes;
279 int err;
280
281 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
282 void *data;
283
284 data = kmap_atomic(sg_page(sg));
285 err = crypto_shash_digest(desc, data + offset, nbytes,
286 req->result);
287 kunmap_atomic(data);
288 crypto_yield(desc->flags);
289 } else
290 err = crypto_shash_init(desc) ?:
291 shash_ahash_finup(req, desc);
292
293 return err;
294}
295EXPORT_SYMBOL_GPL(shash_ahash_digest);
296
297static int shash_async_digest(struct ahash_request *req)
298{
299 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
300 struct shash_desc *desc = ahash_request_ctx(req);
301
302 desc->tfm = *ctx;
303 desc->flags = req->base.flags;
304
305 return shash_ahash_digest(req, desc);
306}
307
308static int shash_async_export(struct ahash_request *req, void *out)
309{
310 return crypto_shash_export(ahash_request_ctx(req), out);
311}
312
313static int shash_async_import(struct ahash_request *req, const void *in)
314{
315 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
316 struct shash_desc *desc = ahash_request_ctx(req);
317
318 desc->tfm = *ctx;
319 desc->flags = req->base.flags;
320
321 return crypto_shash_import(desc, in);
322}
323
324static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
325{
326 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
327
328 crypto_free_shash(*ctx);
329}
330
331int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
332{
333 struct crypto_alg *calg = tfm->__crt_alg;
334 struct shash_alg *alg = __crypto_shash_alg(calg);
335 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
336 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
337 struct crypto_shash *shash;
338
339 if (!crypto_mod_get(calg))
340 return -EAGAIN;
341
342 shash = crypto_create_tfm(calg, &crypto_shash_type);
343 if (IS_ERR(shash)) {
344 crypto_mod_put(calg);
345 return PTR_ERR(shash);
346 }
347
348 *ctx = shash;
349 tfm->exit = crypto_exit_shash_ops_async;
350
351 crt->init = shash_async_init;
352 crt->update = shash_async_update;
353 crt->final = shash_async_final;
354 crt->finup = shash_async_finup;
355 crt->digest = shash_async_digest;
356
357 if (alg->setkey)
358 crt->setkey = shash_async_setkey;
359 if (alg->export)
360 crt->export = shash_async_export;
361 if (alg->import)
362 crt->import = shash_async_import;
363
364 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
365
366 return 0;
367}
368
369static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
370 unsigned int keylen)
371{
372 struct shash_desc **descp = crypto_hash_ctx(tfm);
373 struct shash_desc *desc = *descp;
374
375 return crypto_shash_setkey(desc->tfm, key, keylen);
376}
377
378static int shash_compat_init(struct hash_desc *hdesc)
379{
380 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
381 struct shash_desc *desc = *descp;
382
383 desc->flags = hdesc->flags;
384
385 return crypto_shash_init(desc);
386}
387
388static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
389 unsigned int len)
390{
391 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
392 struct shash_desc *desc = *descp;
393 struct crypto_hash_walk walk;
394 int nbytes;
395
396 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
397 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
398 nbytes = crypto_shash_update(desc, walk.data, nbytes);
399
400 return nbytes;
401}
402
403static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
404{
405 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
406
407 return crypto_shash_final(*descp, out);
408}
409
410static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
411 unsigned int nbytes, u8 *out)
412{
413 unsigned int offset = sg->offset;
414 int err;
415
416 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
417 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
418 struct shash_desc *desc = *descp;
419 void *data;
420
421 desc->flags = hdesc->flags;
422
423 data = kmap_atomic(sg_page(sg));
424 err = crypto_shash_digest(desc, data + offset, nbytes, out);
425 kunmap_atomic(data);
426 crypto_yield(desc->flags);
427 goto out;
428 }
429
430 err = shash_compat_init(hdesc);
431 if (err)
432 goto out;
433
434 err = shash_compat_update(hdesc, sg, nbytes);
435 if (err)
436 goto out;
437
438 err = shash_compat_final(hdesc, out);
439
440out:
441 return err;
442}
443
444static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
445{
446 struct shash_desc **descp = crypto_tfm_ctx(tfm);
447 struct shash_desc *desc = *descp;
448
449 crypto_free_shash(desc->tfm);
450 kzfree(desc);
451}
452
453static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
454{
455 struct hash_tfm *crt = &tfm->crt_hash;
456 struct crypto_alg *calg = tfm->__crt_alg;
457 struct shash_alg *alg = __crypto_shash_alg(calg);
458 struct shash_desc **descp = crypto_tfm_ctx(tfm);
459 struct crypto_shash *shash;
460 struct shash_desc *desc;
461
462 if (!crypto_mod_get(calg))
463 return -EAGAIN;
464
465 shash = crypto_create_tfm(calg, &crypto_shash_type);
466 if (IS_ERR(shash)) {
467 crypto_mod_put(calg);
468 return PTR_ERR(shash);
469 }
470
471 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
472 GFP_KERNEL);
473 if (!desc) {
474 crypto_free_shash(shash);
475 return -ENOMEM;
476 }
477
478 *descp = desc;
479 desc->tfm = shash;
480 tfm->exit = crypto_exit_shash_ops_compat;
481
482 crt->init = shash_compat_init;
483 crt->update = shash_compat_update;
484 crt->final = shash_compat_final;
485 crt->digest = shash_compat_digest;
486 crt->setkey = shash_compat_setkey;
487
488 crt->digestsize = alg->digestsize;
489
490 return 0;
491}
492
493static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
494{
495 switch (mask & CRYPTO_ALG_TYPE_MASK) {
496 case CRYPTO_ALG_TYPE_HASH_MASK:
497 return crypto_init_shash_ops_compat(tfm);
498 }
499
500 return -EINVAL;
501}
502
503static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
504 u32 mask)
505{
506 switch (mask & CRYPTO_ALG_TYPE_MASK) {
507 case CRYPTO_ALG_TYPE_HASH_MASK:
508 return sizeof(struct shash_desc *);
509 }
510
511 return 0;
512}
513
514static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
515{
516 struct crypto_shash *hash = __crypto_shash_cast(tfm);
517
518 hash->descsize = crypto_shash_alg(hash)->descsize;
519 return 0;
520}
521
522static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
523{
524 return alg->cra_ctxsize;
525}
526
527#ifdef CONFIG_NET
528static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
529{
530 struct crypto_report_hash rhash;
531 struct shash_alg *salg = __crypto_shash_alg(alg);
532
533 strncpy(rhash.type, "shash", sizeof(rhash.type));
534
535 rhash.blocksize = alg->cra_blocksize;
536 rhash.digestsize = salg->digestsize;
537
538 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
539 sizeof(struct crypto_report_hash), &rhash))
540 goto nla_put_failure;
541 return 0;
542
543nla_put_failure:
544 return -EMSGSIZE;
545}
546#else
547static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
548{
549 return -ENOSYS;
550}
551#endif
552
553static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
554 __attribute__ ((unused));
555static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
556{
557 struct shash_alg *salg = __crypto_shash_alg(alg);
558
559 seq_printf(m, "type : shash\n");
560 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
561 seq_printf(m, "digestsize : %u\n", salg->digestsize);
562}
563
564static const struct crypto_type crypto_shash_type = {
565 .ctxsize = crypto_shash_ctxsize,
566 .extsize = crypto_shash_extsize,
567 .init = crypto_init_shash_ops,
568 .init_tfm = crypto_shash_init_tfm,
569#ifdef CONFIG_PROC_FS
570 .show = crypto_shash_show,
571#endif
572 .report = crypto_shash_report,
573 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
574 .maskset = CRYPTO_ALG_TYPE_MASK,
575 .type = CRYPTO_ALG_TYPE_SHASH,
576 .tfmsize = offsetof(struct crypto_shash, base),
577};
578
579struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
580 u32 mask)
581{
582 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
583}
584EXPORT_SYMBOL_GPL(crypto_alloc_shash);
585
586static int shash_prepare_alg(struct shash_alg *alg)
587{
588 struct crypto_alg *base = &alg->base;
589
590 if (alg->digestsize > PAGE_SIZE / 8 ||
591 alg->descsize > PAGE_SIZE / 8 ||
592 alg->statesize > PAGE_SIZE / 8)
593 return -EINVAL;
594
595 base->cra_type = &crypto_shash_type;
596 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
597 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
598
599 if (!alg->finup)
600 alg->finup = shash_finup_unaligned;
601 if (!alg->digest)
602 alg->digest = shash_digest_unaligned;
603 if (!alg->export) {
604 alg->export = shash_default_export;
605 alg->import = shash_default_import;
606 alg->statesize = alg->descsize;
607 }
608 if (!alg->setkey)
609 alg->setkey = shash_no_setkey;
610
611 return 0;
612}
613
614int crypto_register_shash(struct shash_alg *alg)
615{
616 struct crypto_alg *base = &alg->base;
617 int err;
618
619 err = shash_prepare_alg(alg);
620 if (err)
621 return err;
622
623 return crypto_register_alg(base);
624}
625EXPORT_SYMBOL_GPL(crypto_register_shash);
626
627int crypto_unregister_shash(struct shash_alg *alg)
628{
629 return crypto_unregister_alg(&alg->base);
630}
631EXPORT_SYMBOL_GPL(crypto_unregister_shash);
632
633int crypto_register_shashes(struct shash_alg *algs, int count)
634{
635 int i, ret;
636
637 for (i = 0; i < count; i++) {
638 ret = crypto_register_shash(&algs[i]);
639 if (ret)
640 goto err;
641 }
642
643 return 0;
644
645err:
646 for (--i; i >= 0; --i)
647 crypto_unregister_shash(&algs[i]);
648
649 return ret;
650}
651EXPORT_SYMBOL_GPL(crypto_register_shashes);
652
653int crypto_unregister_shashes(struct shash_alg *algs, int count)
654{
655 int i, ret;
656
657 for (i = count - 1; i >= 0; --i) {
658 ret = crypto_unregister_shash(&algs[i]);
659 if (ret)
660 pr_err("Failed to unregister %s %s: %d\n",
661 algs[i].base.cra_driver_name,
662 algs[i].base.cra_name, ret);
663 }
664
665 return 0;
666}
667EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
668
669int shash_register_instance(struct crypto_template *tmpl,
670 struct shash_instance *inst)
671{
672 int err;
673
674 err = shash_prepare_alg(&inst->alg);
675 if (err)
676 return err;
677
678 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
679}
680EXPORT_SYMBOL_GPL(shash_register_instance);
681
682void shash_free_instance(struct crypto_instance *inst)
683{
684 crypto_drop_spawn(crypto_instance_ctx(inst));
685 kfree(shash_instance(inst));
686}
687EXPORT_SYMBOL_GPL(shash_free_instance);
688
689int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
690 struct shash_alg *alg,
691 struct crypto_instance *inst)
692{
693 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
694 &crypto_shash_type);
695}
696EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
697
698struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
699{
700 struct crypto_alg *alg;
701
702 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
703 return IS_ERR(alg) ? ERR_CAST(alg) :
704 container_of(alg, struct shash_alg, base);
705}
706EXPORT_SYMBOL_GPL(shash_attr_alg);
707
708MODULE_LICENSE("GPL");
709MODULE_DESCRIPTION("Synchronous cryptographic hash type");