blob: 5fc1f172963dc6914f0f6def8435943acd67dfe7 [file] [log] [blame]
Loc Ho004a4032008-05-14 20:41:47 +08001/*
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
Herbert Xu20036252008-07-07 22:19:53 +080016#include <crypto/internal/hash.h>
17#include <crypto/scatterwalk.h>
Herbert Xu75ecb232014-05-21 20:56:12 +080018#include <linux/bug.h>
Loc Ho004a4032008-05-14 20:41:47 +080019#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>
Steffen Klassert6238cba2011-09-27 07:41:07 +020025#include <linux/cryptouser.h>
26#include <net/netlink.h>
Loc Ho004a4032008-05-14 20:41:47 +080027
28#include "internal.h"
29
Herbert Xu66f6ce52009-07-15 12:40:40 +080030struct ahash_request_priv {
31 crypto_completion_t complete;
32 void *data;
33 u8 *result;
34 void *ubuf[] CRYPTO_MINALIGN_ATTR;
35};
36
Herbert Xu88056ec2009-07-14 12:28:26 +080037static 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
Herbert Xu20036252008-07-07 22:19:53 +080043static 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
Herbert Xu75ecb232014-05-21 20:56:12 +080050 if (walk->flags & CRYPTO_ALG_ASYNC)
51 walk->data = kmap(walk->pg);
52 else
53 walk->data = kmap_atomic(walk->pg);
Herbert Xu20036252008-07-07 22:19:53 +080054 walk->data += offset;
55
Szilveszter Ördög23a75ee2010-08-06 09:26:38 +080056 if (offset & alignmask) {
57 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
Joshua I. Jamesb516d512014-12-05 14:44:54 +090058
Szilveszter Ördög23a75ee2010-08-06 09:26:38 +080059 if (nbytes > unaligned)
60 nbytes = unaligned;
61 }
Herbert Xu20036252008-07-07 22:19:53 +080062
63 walk->entrylen -= nbytes;
64 return nbytes;
65}
66
67static int hash_walk_new_entry(struct crypto_hash_walk *walk)
68{
69 struct scatterlist *sg;
70
71 sg = walk->sg;
72 walk->pg = sg_page(sg);
73 walk->offset = sg->offset;
74 walk->entrylen = sg->length;
75
76 if (walk->entrylen > walk->total)
77 walk->entrylen = walk->total;
78 walk->total -= walk->entrylen;
79
80 return hash_walk_next(walk);
81}
82
83int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
84{
85 unsigned int alignmask = walk->alignmask;
86 unsigned int nbytes = walk->entrylen;
87
88 walk->data -= walk->offset;
89
90 if (nbytes && walk->offset & alignmask && !err) {
Herbert Xu20036252008-07-07 22:19:53 +080091 walk->offset = ALIGN(walk->offset, alignmask + 1);
92 walk->data += walk->offset;
93
94 nbytes = min(nbytes,
95 ((unsigned int)(PAGE_SIZE)) - walk->offset);
96 walk->entrylen -= nbytes;
97
98 return nbytes;
99 }
100
Herbert Xu75ecb232014-05-21 20:56:12 +0800101 if (walk->flags & CRYPTO_ALG_ASYNC)
102 kunmap(walk->pg);
103 else {
104 kunmap_atomic(walk->data);
105 /*
106 * The may sleep test only makes sense for sync users.
107 * Async users don't need to sleep here anyway.
108 */
109 crypto_yield(walk->flags);
110 }
Herbert Xu20036252008-07-07 22:19:53 +0800111
112 if (err)
113 return err;
114
Herbert Xud315a0e2009-05-31 23:09:22 +1000115 if (nbytes) {
116 walk->offset = 0;
117 walk->pg++;
Herbert Xu20036252008-07-07 22:19:53 +0800118 return hash_walk_next(walk);
Herbert Xud315a0e2009-05-31 23:09:22 +1000119 }
Herbert Xu20036252008-07-07 22:19:53 +0800120
121 if (!walk->total)
122 return 0;
123
Cristian Stoica5be4d4c2015-01-20 10:06:16 +0200124 walk->sg = sg_next(walk->sg);
Herbert Xu20036252008-07-07 22:19:53 +0800125
126 return hash_walk_new_entry(walk);
127}
128EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
129
130int crypto_hash_walk_first(struct ahash_request *req,
131 struct crypto_hash_walk *walk)
132{
133 walk->total = req->nbytes;
134
Tim Chen6d9529c2014-07-10 16:18:08 -0700135 if (!walk->total) {
136 walk->entrylen = 0;
Herbert Xu20036252008-07-07 22:19:53 +0800137 return 0;
Tim Chen6d9529c2014-07-10 16:18:08 -0700138 }
Herbert Xu20036252008-07-07 22:19:53 +0800139
140 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
141 walk->sg = req->src;
Herbert Xu75ecb232014-05-21 20:56:12 +0800142 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
Herbert Xu20036252008-07-07 22:19:53 +0800143
144 return hash_walk_new_entry(walk);
145}
146EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
147
Herbert Xu75ecb232014-05-21 20:56:12 +0800148int crypto_ahash_walk_first(struct ahash_request *req,
149 struct crypto_hash_walk *walk)
150{
151 walk->total = req->nbytes;
152
Tim Chen6d9529c2014-07-10 16:18:08 -0700153 if (!walk->total) {
154 walk->entrylen = 0;
Herbert Xu75ecb232014-05-21 20:56:12 +0800155 return 0;
Tim Chen6d9529c2014-07-10 16:18:08 -0700156 }
Herbert Xu75ecb232014-05-21 20:56:12 +0800157
158 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
159 walk->sg = req->src;
160 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
161 walk->flags |= CRYPTO_ALG_ASYNC;
162
163 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
164
165 return hash_walk_new_entry(walk);
166}
167EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
168
Loc Ho004a4032008-05-14 20:41:47 +0800169static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
170 unsigned int keylen)
171{
Loc Ho004a4032008-05-14 20:41:47 +0800172 unsigned long alignmask = crypto_ahash_alignmask(tfm);
173 int ret;
174 u8 *buffer, *alignbuffer;
175 unsigned long absize;
176
177 absize = keylen + alignmask;
Herbert Xu093900c2009-07-14 21:48:35 +0800178 buffer = kmalloc(absize, GFP_KERNEL);
Loc Ho004a4032008-05-14 20:41:47 +0800179 if (!buffer)
180 return -ENOMEM;
181
182 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
183 memcpy(alignbuffer, key, keylen);
Herbert Xua70c5222009-07-15 20:39:05 +0800184 ret = tfm->setkey(tfm, alignbuffer, keylen);
Herbert Xu8c32c512009-07-14 21:35:36 +0800185 kzfree(buffer);
Loc Ho004a4032008-05-14 20:41:47 +0800186 return ret;
187}
188
Herbert Xu66f6ce52009-07-15 12:40:40 +0800189int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
Loc Ho004a4032008-05-14 20:41:47 +0800190 unsigned int keylen)
191{
Loc Ho004a4032008-05-14 20:41:47 +0800192 unsigned long alignmask = crypto_ahash_alignmask(tfm);
193
194 if ((unsigned long)key & alignmask)
195 return ahash_setkey_unaligned(tfm, key, keylen);
196
Herbert Xua70c5222009-07-15 20:39:05 +0800197 return tfm->setkey(tfm, key, keylen);
Loc Ho004a4032008-05-14 20:41:47 +0800198}
Herbert Xu66f6ce52009-07-15 12:40:40 +0800199EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
Loc Ho004a4032008-05-14 20:41:47 +0800200
Herbert Xu3751f402008-11-08 08:56:57 +0800201static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
202 unsigned int keylen)
203{
204 return -ENOSYS;
205}
206
Herbert Xu66f6ce52009-07-15 12:40:40 +0800207static inline unsigned int ahash_align_buffer_size(unsigned len,
208 unsigned long mask)
209{
210 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
211}
212
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100213static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
Herbert Xu66f6ce52009-07-15 12:40:40 +0800214{
215 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
216 unsigned long alignmask = crypto_ahash_alignmask(tfm);
217 unsigned int ds = crypto_ahash_digestsize(tfm);
218 struct ahash_request_priv *priv;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800219
220 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
221 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
Steffen Klassert5befbd52009-07-24 13:56:31 +0800222 GFP_KERNEL : GFP_ATOMIC);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800223 if (!priv)
224 return -ENOMEM;
225
Marek Vasutab6bf4e2014-03-14 02:37:04 +0100226 /*
227 * WARNING: Voodoo programming below!
228 *
229 * The code below is obscure and hard to understand, thus explanation
230 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
231 * to understand the layout of structures used here!
232 *
233 * The code here will replace portions of the ORIGINAL request with
234 * pointers to new code and buffers so the hashing operation can store
235 * the result in aligned buffer. We will call the modified request
236 * an ADJUSTED request.
237 *
238 * The newly mangled request will look as such:
239 *
240 * req {
241 * .result = ADJUSTED[new aligned buffer]
242 * .base.complete = ADJUSTED[pointer to completion function]
243 * .base.data = ADJUSTED[*req (pointer to self)]
244 * .priv = ADJUSTED[new priv] {
245 * .result = ORIGINAL(result)
246 * .complete = ORIGINAL(base.complete)
247 * .data = ORIGINAL(base.data)
248 * }
249 */
250
Herbert Xu66f6ce52009-07-15 12:40:40 +0800251 priv->result = req->result;
252 priv->complete = req->base.complete;
253 priv->data = req->base.data;
Marek Vasutab6bf4e2014-03-14 02:37:04 +0100254 /*
255 * WARNING: We do not backup req->priv here! The req->priv
256 * is for internal use of the Crypto API and the
257 * user must _NOT_ _EVER_ depend on it's content!
258 */
Herbert Xu66f6ce52009-07-15 12:40:40 +0800259
260 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100261 req->base.complete = cplt;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800262 req->base.data = req;
263 req->priv = priv;
264
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100265 return 0;
266}
267
268static void ahash_restore_req(struct ahash_request *req)
269{
270 struct ahash_request_priv *priv = req->priv;
271
272 /* Restore the original crypto request. */
273 req->result = priv->result;
274 req->base.complete = priv->complete;
275 req->base.data = priv->data;
276 req->priv = NULL;
277
278 /* Free the req->priv.priv from the ADJUSTED request. */
279 kzfree(priv);
280}
281
282static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
283{
284 struct ahash_request_priv *priv = req->priv;
285
286 if (err == -EINPROGRESS)
287 return;
288
289 if (!err)
290 memcpy(priv->result, req->result,
291 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
292
293 ahash_restore_req(req);
294}
295
296static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
297{
298 struct ahash_request *areq = req->data;
299
300 /*
301 * Restore the original request, see ahash_op_unaligned() for what
302 * goes where.
303 *
304 * The "struct ahash_request *req" here is in fact the "req.base"
305 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
306 * is a pointer to self, it is also the ADJUSTED "req" .
307 */
308
309 /* First copy req->result into req->priv.result */
310 ahash_op_unaligned_finish(areq, err);
311
312 /* Complete the ORIGINAL request. */
313 areq->base.complete(&areq->base, err);
314}
315
316static int ahash_op_unaligned(struct ahash_request *req,
317 int (*op)(struct ahash_request *))
318{
319 int err;
320
321 err = ahash_save_req(req, ahash_op_unaligned_done);
322 if (err)
323 return err;
324
Herbert Xu66f6ce52009-07-15 12:40:40 +0800325 err = op(req);
326 ahash_op_unaligned_finish(req, err);
327
328 return err;
329}
330
331static int crypto_ahash_op(struct ahash_request *req,
332 int (*op)(struct ahash_request *))
333{
334 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
335 unsigned long alignmask = crypto_ahash_alignmask(tfm);
336
337 if ((unsigned long)req->result & alignmask)
338 return ahash_op_unaligned(req, op);
339
340 return op(req);
341}
342
343int crypto_ahash_final(struct ahash_request *req)
344{
345 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
346}
347EXPORT_SYMBOL_GPL(crypto_ahash_final);
348
349int crypto_ahash_finup(struct ahash_request *req)
350{
351 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
352}
353EXPORT_SYMBOL_GPL(crypto_ahash_finup);
354
355int crypto_ahash_digest(struct ahash_request *req)
356{
357 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
358}
359EXPORT_SYMBOL_GPL(crypto_ahash_digest);
360
361static void ahash_def_finup_finish2(struct ahash_request *req, int err)
362{
363 struct ahash_request_priv *priv = req->priv;
364
365 if (err == -EINPROGRESS)
366 return;
367
368 if (!err)
369 memcpy(priv->result, req->result,
370 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
371
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100372 ahash_restore_req(req);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800373}
374
375static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
376{
377 struct ahash_request *areq = req->data;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800378
379 ahash_def_finup_finish2(areq, err);
380
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100381 areq->base.complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800382}
383
384static int ahash_def_finup_finish1(struct ahash_request *req, int err)
385{
386 if (err)
387 goto out;
388
389 req->base.complete = ahash_def_finup_done2;
390 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
391 err = crypto_ahash_reqtfm(req)->final(req);
392
393out:
394 ahash_def_finup_finish2(req, err);
395 return err;
396}
397
398static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
399{
400 struct ahash_request *areq = req->data;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800401
402 err = ahash_def_finup_finish1(areq, err);
403
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100404 areq->base.complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800405}
406
407static int ahash_def_finup(struct ahash_request *req)
408{
409 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100410 int err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800411
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100412 err = ahash_save_req(req, ahash_def_finup_done1);
413 if (err)
414 return err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800415
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100416 err = tfm->update(req);
417 return ahash_def_finup_finish1(req, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800418}
419
420static int ahash_no_export(struct ahash_request *req, void *out)
421{
422 return -ENOSYS;
423}
424
425static int ahash_no_import(struct ahash_request *req, const void *in)
426{
427 return -ENOSYS;
428}
429
Herbert Xu88056ec2009-07-14 12:28:26 +0800430static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
431{
432 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
433 struct ahash_alg *alg = crypto_ahash_alg(hash);
Herbert Xu88056ec2009-07-14 12:28:26 +0800434
Herbert Xu66f6ce52009-07-15 12:40:40 +0800435 hash->setkey = ahash_nosetkey;
Herbert Xua5596d62016-01-08 21:28:26 +0800436 hash->has_setkey = false;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800437 hash->export = ahash_no_export;
438 hash->import = ahash_no_import;
439
Herbert Xu88056ec2009-07-14 12:28:26 +0800440 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
441 return crypto_init_shash_ops_async(tfm);
442
Herbert Xu88056ec2009-07-14 12:28:26 +0800443 hash->init = alg->init;
444 hash->update = alg->update;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800445 hash->final = alg->final;
446 hash->finup = alg->finup ?: ahash_def_finup;
Herbert Xu88056ec2009-07-14 12:28:26 +0800447 hash->digest = alg->digest;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800448
Herbert Xua5596d62016-01-08 21:28:26 +0800449 if (alg->setkey) {
Herbert Xu66f6ce52009-07-15 12:40:40 +0800450 hash->setkey = alg->setkey;
Herbert Xua5596d62016-01-08 21:28:26 +0800451 hash->has_setkey = true;
452 }
Herbert Xu66f6ce52009-07-15 12:40:40 +0800453 if (alg->export)
454 hash->export = alg->export;
455 if (alg->import)
456 hash->import = alg->import;
Herbert Xu88056ec2009-07-14 12:28:26 +0800457
458 return 0;
459}
460
461static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
462{
463 if (alg->cra_type == &crypto_ahash_type)
464 return alg->cra_ctxsize;
465
466 return sizeof(struct crypto_shash *);
467}
468
Herbert Xu3acc8472011-11-03 23:46:07 +1100469#ifdef CONFIG_NET
Steffen Klassert6238cba2011-09-27 07:41:07 +0200470static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
471{
472 struct crypto_report_hash rhash;
473
Mathias Krause9a5467b2013-02-05 18:19:13 +0100474 strncpy(rhash.type, "ahash", sizeof(rhash.type));
Steffen Klassert6238cba2011-09-27 07:41:07 +0200475
476 rhash.blocksize = alg->cra_blocksize;
477 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
478
David S. Miller6662df32012-04-01 20:19:05 -0400479 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
480 sizeof(struct crypto_report_hash), &rhash))
481 goto nla_put_failure;
Steffen Klassert6238cba2011-09-27 07:41:07 +0200482 return 0;
483
484nla_put_failure:
485 return -EMSGSIZE;
486}
Herbert Xu3acc8472011-11-03 23:46:07 +1100487#else
488static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
489{
490 return -ENOSYS;
491}
492#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200493
Loc Ho004a4032008-05-14 20:41:47 +0800494static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
495 __attribute__ ((unused));
496static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
497{
498 seq_printf(m, "type : ahash\n");
499 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
500 "yes" : "no");
501 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
Herbert Xu88056ec2009-07-14 12:28:26 +0800502 seq_printf(m, "digestsize : %u\n",
503 __crypto_hash_alg_common(alg)->digestsize);
Loc Ho004a4032008-05-14 20:41:47 +0800504}
505
506const struct crypto_type crypto_ahash_type = {
Herbert Xu88056ec2009-07-14 12:28:26 +0800507 .extsize = crypto_ahash_extsize,
508 .init_tfm = crypto_ahash_init_tfm,
Loc Ho004a4032008-05-14 20:41:47 +0800509#ifdef CONFIG_PROC_FS
510 .show = crypto_ahash_show,
511#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200512 .report = crypto_ahash_report,
Herbert Xu88056ec2009-07-14 12:28:26 +0800513 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
514 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
515 .type = CRYPTO_ALG_TYPE_AHASH,
516 .tfmsize = offsetof(struct crypto_ahash, base),
Loc Ho004a4032008-05-14 20:41:47 +0800517};
518EXPORT_SYMBOL_GPL(crypto_ahash_type);
519
Herbert Xu88056ec2009-07-14 12:28:26 +0800520struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
521 u32 mask)
522{
523 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
524}
525EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
526
Herbert Xu8d18e342016-01-23 13:52:40 +0800527int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
528{
529 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
530}
531EXPORT_SYMBOL_GPL(crypto_has_ahash);
532
Herbert Xu01c2dec2009-07-14 14:06:06 +0800533static int ahash_prepare_alg(struct ahash_alg *alg)
534{
535 struct crypto_alg *base = &alg->halg.base;
536
537 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
Russell King8996eaf2015-10-09 20:43:33 +0100538 alg->halg.statesize > PAGE_SIZE / 8 ||
539 alg->halg.statesize == 0)
Herbert Xu01c2dec2009-07-14 14:06:06 +0800540 return -EINVAL;
541
542 base->cra_type = &crypto_ahash_type;
543 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
544 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
545
546 return 0;
547}
548
549int crypto_register_ahash(struct ahash_alg *alg)
550{
551 struct crypto_alg *base = &alg->halg.base;
552 int err;
553
554 err = ahash_prepare_alg(alg);
555 if (err)
556 return err;
557
558 return crypto_register_alg(base);
559}
560EXPORT_SYMBOL_GPL(crypto_register_ahash);
561
562int crypto_unregister_ahash(struct ahash_alg *alg)
563{
564 return crypto_unregister_alg(&alg->halg.base);
565}
566EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
567
568int ahash_register_instance(struct crypto_template *tmpl,
569 struct ahash_instance *inst)
570{
571 int err;
572
573 err = ahash_prepare_alg(&inst->alg);
574 if (err)
575 return err;
576
577 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
578}
579EXPORT_SYMBOL_GPL(ahash_register_instance);
580
581void ahash_free_instance(struct crypto_instance *inst)
582{
583 crypto_drop_spawn(crypto_instance_ctx(inst));
584 kfree(ahash_instance(inst));
585}
586EXPORT_SYMBOL_GPL(ahash_free_instance);
587
588int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
589 struct hash_alg_common *alg,
590 struct crypto_instance *inst)
591{
592 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
593 &crypto_ahash_type);
594}
595EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
596
597struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
598{
599 struct crypto_alg *alg;
600
601 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
602 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
603}
604EXPORT_SYMBOL_GPL(ahash_attr_alg);
605
Loc Ho004a4032008-05-14 20:41:47 +0800606MODULE_LICENSE("GPL");
607MODULE_DESCRIPTION("Asynchronous cryptographic hash type");