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CommitLineData
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1/*
2 * Asynchronous Cryptographic Hash operations.
3 *
4 * This is the asynchronous version of hash.c with notification of
5 * completion via a callback.
6 *
7 * Copyright (c) 2008 Loc Ho <lho@amcc.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15
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16#include <crypto/internal/hash.h>
17#include <crypto/scatterwalk.h>
75ecb231 18#include <linux/bug.h>
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19#include <linux/err.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/seq_file.h>
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25#include <linux/cryptouser.h>
26#include <net/netlink.h>
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27
28#include "internal.h"
29
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30struct ahash_request_priv {
31 crypto_completion_t complete;
32 void *data;
33 u8 *result;
34 void *ubuf[] CRYPTO_MINALIGN_ATTR;
35};
36
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37static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
38{
39 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
40 halg);
41}
42
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43static int hash_walk_next(struct crypto_hash_walk *walk)
44{
45 unsigned int alignmask = walk->alignmask;
46 unsigned int offset = walk->offset;
47 unsigned int nbytes = min(walk->entrylen,
48 ((unsigned int)(PAGE_SIZE)) - offset);
49
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50 if (walk->flags & CRYPTO_ALG_ASYNC)
51 walk->data = kmap(walk->pg);
52 else
53 walk->data = kmap_atomic(walk->pg);
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54 walk->data += offset;
55
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56 if (offset & alignmask) {
57 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
58 if (nbytes > unaligned)
59 nbytes = unaligned;
60 }
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61
62 walk->entrylen -= nbytes;
63 return nbytes;
64}
65
66static int hash_walk_new_entry(struct crypto_hash_walk *walk)
67{
68 struct scatterlist *sg;
69
70 sg = walk->sg;
71 walk->pg = sg_page(sg);
72 walk->offset = sg->offset;
73 walk->entrylen = sg->length;
74
75 if (walk->entrylen > walk->total)
76 walk->entrylen = walk->total;
77 walk->total -= walk->entrylen;
78
79 return hash_walk_next(walk);
80}
81
82int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
83{
84 unsigned int alignmask = walk->alignmask;
85 unsigned int nbytes = walk->entrylen;
86
87 walk->data -= walk->offset;
88
89 if (nbytes && walk->offset & alignmask && !err) {
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90 walk->offset = ALIGN(walk->offset, alignmask + 1);
91 walk->data += walk->offset;
92
93 nbytes = min(nbytes,
94 ((unsigned int)(PAGE_SIZE)) - walk->offset);
95 walk->entrylen -= nbytes;
96
97 return nbytes;
98 }
99
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100 if (walk->flags & CRYPTO_ALG_ASYNC)
101 kunmap(walk->pg);
102 else {
103 kunmap_atomic(walk->data);
104 /*
105 * The may sleep test only makes sense for sync users.
106 * Async users don't need to sleep here anyway.
107 */
108 crypto_yield(walk->flags);
109 }
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110
111 if (err)
112 return err;
113
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114 if (nbytes) {
115 walk->offset = 0;
116 walk->pg++;
20036252 117 return hash_walk_next(walk);
d315a0e0 118 }
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119
120 if (!walk->total)
121 return 0;
122
123 walk->sg = scatterwalk_sg_next(walk->sg);
124
125 return hash_walk_new_entry(walk);
126}
127EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
128
129int crypto_hash_walk_first(struct ahash_request *req,
130 struct crypto_hash_walk *walk)
131{
132 walk->total = req->nbytes;
133
134 if (!walk->total)
135 return 0;
136
137 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
138 walk->sg = req->src;
75ecb231 139 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
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140
141 return hash_walk_new_entry(walk);
142}
143EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
144
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145int crypto_ahash_walk_first(struct ahash_request *req,
146 struct crypto_hash_walk *walk)
147{
148 walk->total = req->nbytes;
149
150 if (!walk->total)
151 return 0;
152
153 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
154 walk->sg = req->src;
155 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
156 walk->flags |= CRYPTO_ALG_ASYNC;
157
158 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
159
160 return hash_walk_new_entry(walk);
161}
162EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
163
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164int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
165 struct crypto_hash_walk *walk,
166 struct scatterlist *sg, unsigned int len)
167{
168 walk->total = len;
169
170 if (!walk->total)
171 return 0;
172
173 walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
174 walk->sg = sg;
75ecb231 175 walk->flags = hdesc->flags & CRYPTO_TFM_REQ_MASK;
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176
177 return hash_walk_new_entry(walk);
178}
179
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180static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
181 unsigned int keylen)
182{
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183 unsigned long alignmask = crypto_ahash_alignmask(tfm);
184 int ret;
185 u8 *buffer, *alignbuffer;
186 unsigned long absize;
187
188 absize = keylen + alignmask;
093900c2 189 buffer = kmalloc(absize, GFP_KERNEL);
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190 if (!buffer)
191 return -ENOMEM;
192
193 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
194 memcpy(alignbuffer, key, keylen);
a70c5225 195 ret = tfm->setkey(tfm, alignbuffer, keylen);
8c32c516 196 kzfree(buffer);
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197 return ret;
198}
199
66f6ce5e 200int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
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201 unsigned int keylen)
202{
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203 unsigned long alignmask = crypto_ahash_alignmask(tfm);
204
205 if ((unsigned long)key & alignmask)
206 return ahash_setkey_unaligned(tfm, key, keylen);
207
a70c5225 208 return tfm->setkey(tfm, key, keylen);
004a403c 209}
66f6ce5e 210EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
004a403c 211
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212static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
213 unsigned int keylen)
214{
215 return -ENOSYS;
216}
217
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218static inline unsigned int ahash_align_buffer_size(unsigned len,
219 unsigned long mask)
220{
221 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
222}
223
1ffc9fbd 224static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
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225{
226 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
227 unsigned long alignmask = crypto_ahash_alignmask(tfm);
228 unsigned int ds = crypto_ahash_digestsize(tfm);
229 struct ahash_request_priv *priv;
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230
231 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
232 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
5befbd5a 233 GFP_KERNEL : GFP_ATOMIC);
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234 if (!priv)
235 return -ENOMEM;
236
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237 /*
238 * WARNING: Voodoo programming below!
239 *
240 * The code below is obscure and hard to understand, thus explanation
241 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
242 * to understand the layout of structures used here!
243 *
244 * The code here will replace portions of the ORIGINAL request with
245 * pointers to new code and buffers so the hashing operation can store
246 * the result in aligned buffer. We will call the modified request
247 * an ADJUSTED request.
248 *
249 * The newly mangled request will look as such:
250 *
251 * req {
252 * .result = ADJUSTED[new aligned buffer]
253 * .base.complete = ADJUSTED[pointer to completion function]
254 * .base.data = ADJUSTED[*req (pointer to self)]
255 * .priv = ADJUSTED[new priv] {
256 * .result = ORIGINAL(result)
257 * .complete = ORIGINAL(base.complete)
258 * .data = ORIGINAL(base.data)
259 * }
260 */
261
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262 priv->result = req->result;
263 priv->complete = req->base.complete;
264 priv->data = req->base.data;
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265 /*
266 * WARNING: We do not backup req->priv here! The req->priv
267 * is for internal use of the Crypto API and the
268 * user must _NOT_ _EVER_ depend on it's content!
269 */
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270
271 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
1ffc9fbd 272 req->base.complete = cplt;
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273 req->base.data = req;
274 req->priv = priv;
275
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276 return 0;
277}
278
279static void ahash_restore_req(struct ahash_request *req)
280{
281 struct ahash_request_priv *priv = req->priv;
282
283 /* Restore the original crypto request. */
284 req->result = priv->result;
285 req->base.complete = priv->complete;
286 req->base.data = priv->data;
287 req->priv = NULL;
288
289 /* Free the req->priv.priv from the ADJUSTED request. */
290 kzfree(priv);
291}
292
293static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
294{
295 struct ahash_request_priv *priv = req->priv;
296
297 if (err == -EINPROGRESS)
298 return;
299
300 if (!err)
301 memcpy(priv->result, req->result,
302 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
303
304 ahash_restore_req(req);
305}
306
307static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
308{
309 struct ahash_request *areq = req->data;
310
311 /*
312 * Restore the original request, see ahash_op_unaligned() for what
313 * goes where.
314 *
315 * The "struct ahash_request *req" here is in fact the "req.base"
316 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
317 * is a pointer to self, it is also the ADJUSTED "req" .
318 */
319
320 /* First copy req->result into req->priv.result */
321 ahash_op_unaligned_finish(areq, err);
322
323 /* Complete the ORIGINAL request. */
324 areq->base.complete(&areq->base, err);
325}
326
327static int ahash_op_unaligned(struct ahash_request *req,
328 int (*op)(struct ahash_request *))
329{
330 int err;
331
332 err = ahash_save_req(req, ahash_op_unaligned_done);
333 if (err)
334 return err;
335
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336 err = op(req);
337 ahash_op_unaligned_finish(req, err);
338
339 return err;
340}
341
342static int crypto_ahash_op(struct ahash_request *req,
343 int (*op)(struct ahash_request *))
344{
345 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
346 unsigned long alignmask = crypto_ahash_alignmask(tfm);
347
348 if ((unsigned long)req->result & alignmask)
349 return ahash_op_unaligned(req, op);
350
351 return op(req);
352}
353
354int crypto_ahash_final(struct ahash_request *req)
355{
356 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
357}
358EXPORT_SYMBOL_GPL(crypto_ahash_final);
359
360int crypto_ahash_finup(struct ahash_request *req)
361{
362 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
363}
364EXPORT_SYMBOL_GPL(crypto_ahash_finup);
365
366int crypto_ahash_digest(struct ahash_request *req)
367{
368 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
369}
370EXPORT_SYMBOL_GPL(crypto_ahash_digest);
371
372static void ahash_def_finup_finish2(struct ahash_request *req, int err)
373{
374 struct ahash_request_priv *priv = req->priv;
375
376 if (err == -EINPROGRESS)
377 return;
378
379 if (!err)
380 memcpy(priv->result, req->result,
381 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
382
d4a7a0fb 383 ahash_restore_req(req);
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384}
385
386static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
387{
388 struct ahash_request *areq = req->data;
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389
390 ahash_def_finup_finish2(areq, err);
391
d4a7a0fb 392 areq->base.complete(&areq->base, err);
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393}
394
395static int ahash_def_finup_finish1(struct ahash_request *req, int err)
396{
397 if (err)
398 goto out;
399
400 req->base.complete = ahash_def_finup_done2;
401 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
402 err = crypto_ahash_reqtfm(req)->final(req);
403
404out:
405 ahash_def_finup_finish2(req, err);
406 return err;
407}
408
409static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
410{
411 struct ahash_request *areq = req->data;
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412
413 err = ahash_def_finup_finish1(areq, err);
414
d4a7a0fb 415 areq->base.complete(&areq->base, err);
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416}
417
418static int ahash_def_finup(struct ahash_request *req)
419{
420 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
d4a7a0fb 421 int err;
66f6ce5e 422
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423 err = ahash_save_req(req, ahash_def_finup_done1);
424 if (err)
425 return err;
66f6ce5e 426
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427 err = tfm->update(req);
428 return ahash_def_finup_finish1(req, err);
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429}
430
431static int ahash_no_export(struct ahash_request *req, void *out)
432{
433 return -ENOSYS;
434}
435
436static int ahash_no_import(struct ahash_request *req, const void *in)
437{
438 return -ENOSYS;
439}
440
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441static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
442{
443 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
444 struct ahash_alg *alg = crypto_ahash_alg(hash);
88056ec3 445
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446 hash->setkey = ahash_nosetkey;
447 hash->export = ahash_no_export;
448 hash->import = ahash_no_import;
449
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450 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
451 return crypto_init_shash_ops_async(tfm);
452
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453 hash->init = alg->init;
454 hash->update = alg->update;
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455 hash->final = alg->final;
456 hash->finup = alg->finup ?: ahash_def_finup;
88056ec3 457 hash->digest = alg->digest;
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458
459 if (alg->setkey)
460 hash->setkey = alg->setkey;
461 if (alg->export)
462 hash->export = alg->export;
463 if (alg->import)
464 hash->import = alg->import;
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465
466 return 0;
467}
468
469static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
470{
471 if (alg->cra_type == &crypto_ahash_type)
472 return alg->cra_ctxsize;
473
474 return sizeof(struct crypto_shash *);
475}
476
3acc8473 477#ifdef CONFIG_NET
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478static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
479{
480 struct crypto_report_hash rhash;
481
9a5467bf 482 strncpy(rhash.type, "ahash", sizeof(rhash.type));
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483
484 rhash.blocksize = alg->cra_blocksize;
485 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
486
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487 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
488 sizeof(struct crypto_report_hash), &rhash))
489 goto nla_put_failure;
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490 return 0;
491
492nla_put_failure:
493 return -EMSGSIZE;
494}
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495#else
496static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
497{
498 return -ENOSYS;
499}
500#endif
6238cbae 501
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502static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
503 __attribute__ ((unused));
504static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
505{
506 seq_printf(m, "type : ahash\n");
507 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
508 "yes" : "no");
509 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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510 seq_printf(m, "digestsize : %u\n",
511 __crypto_hash_alg_common(alg)->digestsize);
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512}
513
514const struct crypto_type crypto_ahash_type = {
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515 .extsize = crypto_ahash_extsize,
516 .init_tfm = crypto_ahash_init_tfm,
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517#ifdef CONFIG_PROC_FS
518 .show = crypto_ahash_show,
519#endif
6238cbae 520 .report = crypto_ahash_report,
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521 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
522 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
523 .type = CRYPTO_ALG_TYPE_AHASH,
524 .tfmsize = offsetof(struct crypto_ahash, base),
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525};
526EXPORT_SYMBOL_GPL(crypto_ahash_type);
527
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528struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
529 u32 mask)
530{
531 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
532}
533EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
534
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535static int ahash_prepare_alg(struct ahash_alg *alg)
536{
537 struct crypto_alg *base = &alg->halg.base;
538
539 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
540 alg->halg.statesize > PAGE_SIZE / 8)
541 return -EINVAL;
542
543 base->cra_type = &crypto_ahash_type;
544 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
545 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
546
547 return 0;
548}
549
550int crypto_register_ahash(struct ahash_alg *alg)
551{
552 struct crypto_alg *base = &alg->halg.base;
553 int err;
554
555 err = ahash_prepare_alg(alg);
556 if (err)
557 return err;
558
559 return crypto_register_alg(base);
560}
561EXPORT_SYMBOL_GPL(crypto_register_ahash);
562
563int crypto_unregister_ahash(struct ahash_alg *alg)
564{
565 return crypto_unregister_alg(&alg->halg.base);
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
568
569int ahash_register_instance(struct crypto_template *tmpl,
570 struct ahash_instance *inst)
571{
572 int err;
573
574 err = ahash_prepare_alg(&inst->alg);
575 if (err)
576 return err;
577
578 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
579}
580EXPORT_SYMBOL_GPL(ahash_register_instance);
581
582void ahash_free_instance(struct crypto_instance *inst)
583{
584 crypto_drop_spawn(crypto_instance_ctx(inst));
585 kfree(ahash_instance(inst));
586}
587EXPORT_SYMBOL_GPL(ahash_free_instance);
588
589int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
590 struct hash_alg_common *alg,
591 struct crypto_instance *inst)
592{
593 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
594 &crypto_ahash_type);
595}
596EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
597
598struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
599{
600 struct crypto_alg *alg;
601
602 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
603 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
604}
605EXPORT_SYMBOL_GPL(ahash_attr_alg);
606
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607MODULE_LICENSE("GPL");
608MODULE_DESCRIPTION("Asynchronous cryptographic hash type");