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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;
Herbert Xu20036252008-07-07 22:19:53 +080072 walk->offset = sg->offset;
Herbert Xu13f4bb72016-05-04 17:52:56 +080073 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
74 walk->offset = offset_in_page(walk->offset);
Herbert Xu20036252008-07-07 22:19:53 +080075 walk->entrylen = sg->length;
76
77 if (walk->entrylen > walk->total)
78 walk->entrylen = walk->total;
79 walk->total -= walk->entrylen;
80
81 return hash_walk_next(walk);
82}
83
84int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
85{
86 unsigned int alignmask = walk->alignmask;
87 unsigned int nbytes = walk->entrylen;
88
89 walk->data -= walk->offset;
90
91 if (nbytes && walk->offset & alignmask && !err) {
Herbert Xu20036252008-07-07 22:19:53 +080092 walk->offset = ALIGN(walk->offset, alignmask + 1);
93 walk->data += walk->offset;
94
95 nbytes = min(nbytes,
96 ((unsigned int)(PAGE_SIZE)) - walk->offset);
97 walk->entrylen -= nbytes;
98
99 return nbytes;
100 }
101
Herbert Xu75ecb232014-05-21 20:56:12 +0800102 if (walk->flags & CRYPTO_ALG_ASYNC)
103 kunmap(walk->pg);
104 else {
105 kunmap_atomic(walk->data);
106 /*
107 * The may sleep test only makes sense for sync users.
108 * Async users don't need to sleep here anyway.
109 */
110 crypto_yield(walk->flags);
111 }
Herbert Xu20036252008-07-07 22:19:53 +0800112
113 if (err)
114 return err;
115
Herbert Xud315a0e2009-05-31 23:09:22 +1000116 if (nbytes) {
117 walk->offset = 0;
118 walk->pg++;
Herbert Xu20036252008-07-07 22:19:53 +0800119 return hash_walk_next(walk);
Herbert Xud315a0e2009-05-31 23:09:22 +1000120 }
Herbert Xu20036252008-07-07 22:19:53 +0800121
122 if (!walk->total)
123 return 0;
124
Cristian Stoica5be4d4c2015-01-20 10:06:16 +0200125 walk->sg = sg_next(walk->sg);
Herbert Xu20036252008-07-07 22:19:53 +0800126
127 return hash_walk_new_entry(walk);
128}
129EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
130
131int crypto_hash_walk_first(struct ahash_request *req,
132 struct crypto_hash_walk *walk)
133{
134 walk->total = req->nbytes;
135
Tim Chen6d9529c2014-07-10 16:18:08 -0700136 if (!walk->total) {
137 walk->entrylen = 0;
Herbert Xu20036252008-07-07 22:19:53 +0800138 return 0;
Tim Chen6d9529c2014-07-10 16:18:08 -0700139 }
Herbert Xu20036252008-07-07 22:19:53 +0800140
141 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
142 walk->sg = req->src;
Herbert Xu75ecb232014-05-21 20:56:12 +0800143 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
Herbert Xu20036252008-07-07 22:19:53 +0800144
145 return hash_walk_new_entry(walk);
146}
147EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
148
Herbert Xu75ecb232014-05-21 20:56:12 +0800149int crypto_ahash_walk_first(struct ahash_request *req,
150 struct crypto_hash_walk *walk)
151{
152 walk->total = req->nbytes;
153
Tim Chen6d9529c2014-07-10 16:18:08 -0700154 if (!walk->total) {
155 walk->entrylen = 0;
Herbert Xu75ecb232014-05-21 20:56:12 +0800156 return 0;
Tim Chen6d9529c2014-07-10 16:18:08 -0700157 }
Herbert Xu75ecb232014-05-21 20:56:12 +0800158
159 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
160 walk->sg = req->src;
161 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
162 walk->flags |= CRYPTO_ALG_ASYNC;
163
164 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
165
166 return hash_walk_new_entry(walk);
167}
168EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
169
Loc Ho004a4032008-05-14 20:41:47 +0800170static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
171 unsigned int keylen)
172{
Loc Ho004a4032008-05-14 20:41:47 +0800173 unsigned long alignmask = crypto_ahash_alignmask(tfm);
174 int ret;
175 u8 *buffer, *alignbuffer;
176 unsigned long absize;
177
178 absize = keylen + alignmask;
Herbert Xu093900c2009-07-14 21:48:35 +0800179 buffer = kmalloc(absize, GFP_KERNEL);
Loc Ho004a4032008-05-14 20:41:47 +0800180 if (!buffer)
181 return -ENOMEM;
182
183 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
184 memcpy(alignbuffer, key, keylen);
Herbert Xua70c5222009-07-15 20:39:05 +0800185 ret = tfm->setkey(tfm, alignbuffer, keylen);
Herbert Xu8c32c512009-07-14 21:35:36 +0800186 kzfree(buffer);
Loc Ho004a4032008-05-14 20:41:47 +0800187 return ret;
188}
189
Herbert Xu66f6ce52009-07-15 12:40:40 +0800190int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
Loc Ho004a4032008-05-14 20:41:47 +0800191 unsigned int keylen)
192{
Loc Ho004a4032008-05-14 20:41:47 +0800193 unsigned long alignmask = crypto_ahash_alignmask(tfm);
194
195 if ((unsigned long)key & alignmask)
196 return ahash_setkey_unaligned(tfm, key, keylen);
197
Herbert Xua70c5222009-07-15 20:39:05 +0800198 return tfm->setkey(tfm, key, keylen);
Loc Ho004a4032008-05-14 20:41:47 +0800199}
Herbert Xu66f6ce52009-07-15 12:40:40 +0800200EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
Loc Ho004a4032008-05-14 20:41:47 +0800201
Herbert Xu3751f402008-11-08 08:56:57 +0800202static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
203 unsigned int keylen)
204{
205 return -ENOSYS;
206}
207
Herbert Xu66f6ce52009-07-15 12:40:40 +0800208static inline unsigned int ahash_align_buffer_size(unsigned len,
209 unsigned long mask)
210{
211 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
212}
213
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100214static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
Herbert Xu66f6ce52009-07-15 12:40:40 +0800215{
216 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
217 unsigned long alignmask = crypto_ahash_alignmask(tfm);
218 unsigned int ds = crypto_ahash_digestsize(tfm);
219 struct ahash_request_priv *priv;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800220
221 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
222 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
Steffen Klassert5befbd52009-07-24 13:56:31 +0800223 GFP_KERNEL : GFP_ATOMIC);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800224 if (!priv)
225 return -ENOMEM;
226
Marek Vasutab6bf4e2014-03-14 02:37:04 +0100227 /*
228 * WARNING: Voodoo programming below!
229 *
230 * The code below is obscure and hard to understand, thus explanation
231 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
232 * to understand the layout of structures used here!
233 *
234 * The code here will replace portions of the ORIGINAL request with
235 * pointers to new code and buffers so the hashing operation can store
236 * the result in aligned buffer. We will call the modified request
237 * an ADJUSTED request.
238 *
239 * The newly mangled request will look as such:
240 *
241 * req {
242 * .result = ADJUSTED[new aligned buffer]
243 * .base.complete = ADJUSTED[pointer to completion function]
244 * .base.data = ADJUSTED[*req (pointer to self)]
245 * .priv = ADJUSTED[new priv] {
246 * .result = ORIGINAL(result)
247 * .complete = ORIGINAL(base.complete)
248 * .data = ORIGINAL(base.data)
249 * }
250 */
251
Herbert Xu66f6ce52009-07-15 12:40:40 +0800252 priv->result = req->result;
253 priv->complete = req->base.complete;
254 priv->data = req->base.data;
Marek Vasutab6bf4e2014-03-14 02:37:04 +0100255 /*
256 * WARNING: We do not backup req->priv here! The req->priv
257 * is for internal use of the Crypto API and the
258 * user must _NOT_ _EVER_ depend on it's content!
259 */
Herbert Xu66f6ce52009-07-15 12:40:40 +0800260
261 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100262 req->base.complete = cplt;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800263 req->base.data = req;
264 req->priv = priv;
265
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100266 return 0;
267}
268
269static void ahash_restore_req(struct ahash_request *req)
270{
271 struct ahash_request_priv *priv = req->priv;
272
273 /* Restore the original crypto request. */
274 req->result = priv->result;
275 req->base.complete = priv->complete;
276 req->base.data = priv->data;
277 req->priv = NULL;
278
279 /* Free the req->priv.priv from the ADJUSTED request. */
280 kzfree(priv);
281}
282
283static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
284{
285 struct ahash_request_priv *priv = req->priv;
286
287 if (err == -EINPROGRESS)
288 return;
289
290 if (!err)
291 memcpy(priv->result, req->result,
292 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
293
294 ahash_restore_req(req);
295}
296
297static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
298{
299 struct ahash_request *areq = req->data;
300
301 /*
302 * Restore the original request, see ahash_op_unaligned() for what
303 * goes where.
304 *
305 * The "struct ahash_request *req" here is in fact the "req.base"
306 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
307 * is a pointer to self, it is also the ADJUSTED "req" .
308 */
309
310 /* First copy req->result into req->priv.result */
311 ahash_op_unaligned_finish(areq, err);
312
313 /* Complete the ORIGINAL request. */
314 areq->base.complete(&areq->base, err);
315}
316
317static int ahash_op_unaligned(struct ahash_request *req,
318 int (*op)(struct ahash_request *))
319{
320 int err;
321
322 err = ahash_save_req(req, ahash_op_unaligned_done);
323 if (err)
324 return err;
325
Herbert Xu66f6ce52009-07-15 12:40:40 +0800326 err = op(req);
327 ahash_op_unaligned_finish(req, err);
328
329 return err;
330}
331
332static int crypto_ahash_op(struct ahash_request *req,
333 int (*op)(struct ahash_request *))
334{
335 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
336 unsigned long alignmask = crypto_ahash_alignmask(tfm);
337
338 if ((unsigned long)req->result & alignmask)
339 return ahash_op_unaligned(req, op);
340
341 return op(req);
342}
343
344int crypto_ahash_final(struct ahash_request *req)
345{
346 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
347}
348EXPORT_SYMBOL_GPL(crypto_ahash_final);
349
350int crypto_ahash_finup(struct ahash_request *req)
351{
352 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
353}
354EXPORT_SYMBOL_GPL(crypto_ahash_finup);
355
356int crypto_ahash_digest(struct ahash_request *req)
357{
358 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
359}
360EXPORT_SYMBOL_GPL(crypto_ahash_digest);
361
362static void ahash_def_finup_finish2(struct ahash_request *req, int err)
363{
364 struct ahash_request_priv *priv = req->priv;
365
366 if (err == -EINPROGRESS)
367 return;
368
369 if (!err)
370 memcpy(priv->result, req->result,
371 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
372
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100373 ahash_restore_req(req);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800374}
375
376static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
377{
378 struct ahash_request *areq = req->data;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800379
380 ahash_def_finup_finish2(areq, err);
381
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100382 areq->base.complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800383}
384
385static int ahash_def_finup_finish1(struct ahash_request *req, int err)
386{
387 if (err)
388 goto out;
389
390 req->base.complete = ahash_def_finup_done2;
391 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
392 err = crypto_ahash_reqtfm(req)->final(req);
393
394out:
395 ahash_def_finup_finish2(req, err);
396 return err;
397}
398
399static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
400{
401 struct ahash_request *areq = req->data;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800402
403 err = ahash_def_finup_finish1(areq, err);
404
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100405 areq->base.complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800406}
407
408static int ahash_def_finup(struct ahash_request *req)
409{
410 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100411 int err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800412
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100413 err = ahash_save_req(req, ahash_def_finup_done1);
414 if (err)
415 return err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800416
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100417 err = tfm->update(req);
418 return ahash_def_finup_finish1(req, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800419}
420
421static int ahash_no_export(struct ahash_request *req, void *out)
422{
423 return -ENOSYS;
424}
425
426static int ahash_no_import(struct ahash_request *req, const void *in)
427{
428 return -ENOSYS;
429}
430
Herbert Xu88056ec2009-07-14 12:28:26 +0800431static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
432{
433 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
434 struct ahash_alg *alg = crypto_ahash_alg(hash);
Herbert Xu88056ec2009-07-14 12:28:26 +0800435
Herbert Xu66f6ce52009-07-15 12:40:40 +0800436 hash->setkey = ahash_nosetkey;
Herbert Xua5596d62016-01-08 21:28:26 +0800437 hash->has_setkey = false;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800438 hash->export = ahash_no_export;
439 hash->import = ahash_no_import;
440
Herbert Xu88056ec2009-07-14 12:28:26 +0800441 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
442 return crypto_init_shash_ops_async(tfm);
443
Herbert Xu88056ec2009-07-14 12:28:26 +0800444 hash->init = alg->init;
445 hash->update = alg->update;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800446 hash->final = alg->final;
447 hash->finup = alg->finup ?: ahash_def_finup;
Herbert Xu88056ec2009-07-14 12:28:26 +0800448 hash->digest = alg->digest;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800449
Herbert Xua5596d62016-01-08 21:28:26 +0800450 if (alg->setkey) {
Herbert Xu66f6ce52009-07-15 12:40:40 +0800451 hash->setkey = alg->setkey;
Herbert Xua5596d62016-01-08 21:28:26 +0800452 hash->has_setkey = true;
453 }
Herbert Xu66f6ce52009-07-15 12:40:40 +0800454 if (alg->export)
455 hash->export = alg->export;
456 if (alg->import)
457 hash->import = alg->import;
Herbert Xu88056ec2009-07-14 12:28:26 +0800458
459 return 0;
460}
461
462static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
463{
464 if (alg->cra_type == &crypto_ahash_type)
465 return alg->cra_ctxsize;
466
467 return sizeof(struct crypto_shash *);
468}
469
Herbert Xu3acc8472011-11-03 23:46:07 +1100470#ifdef CONFIG_NET
Steffen Klassert6238cba2011-09-27 07:41:07 +0200471static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
472{
473 struct crypto_report_hash rhash;
474
Mathias Krause9a5467b2013-02-05 18:19:13 +0100475 strncpy(rhash.type, "ahash", sizeof(rhash.type));
Steffen Klassert6238cba2011-09-27 07:41:07 +0200476
477 rhash.blocksize = alg->cra_blocksize;
478 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
479
David S. Miller6662df32012-04-01 20:19:05 -0400480 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
481 sizeof(struct crypto_report_hash), &rhash))
482 goto nla_put_failure;
Steffen Klassert6238cba2011-09-27 07:41:07 +0200483 return 0;
484
485nla_put_failure:
486 return -EMSGSIZE;
487}
Herbert Xu3acc8472011-11-03 23:46:07 +1100488#else
489static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
490{
491 return -ENOSYS;
492}
493#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200494
Loc Ho004a4032008-05-14 20:41:47 +0800495static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
496 __attribute__ ((unused));
497static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
498{
499 seq_printf(m, "type : ahash\n");
500 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
501 "yes" : "no");
502 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
Herbert Xu88056ec2009-07-14 12:28:26 +0800503 seq_printf(m, "digestsize : %u\n",
504 __crypto_hash_alg_common(alg)->digestsize);
Loc Ho004a4032008-05-14 20:41:47 +0800505}
506
507const struct crypto_type crypto_ahash_type = {
Herbert Xu88056ec2009-07-14 12:28:26 +0800508 .extsize = crypto_ahash_extsize,
509 .init_tfm = crypto_ahash_init_tfm,
Loc Ho004a4032008-05-14 20:41:47 +0800510#ifdef CONFIG_PROC_FS
511 .show = crypto_ahash_show,
512#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200513 .report = crypto_ahash_report,
Herbert Xu88056ec2009-07-14 12:28:26 +0800514 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
515 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
516 .type = CRYPTO_ALG_TYPE_AHASH,
517 .tfmsize = offsetof(struct crypto_ahash, base),
Loc Ho004a4032008-05-14 20:41:47 +0800518};
519EXPORT_SYMBOL_GPL(crypto_ahash_type);
520
Herbert Xu88056ec2009-07-14 12:28:26 +0800521struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
522 u32 mask)
523{
524 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
525}
526EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
527
Herbert Xu8d18e342016-01-23 13:52:40 +0800528int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
529{
530 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
531}
532EXPORT_SYMBOL_GPL(crypto_has_ahash);
533
Herbert Xu01c2dec2009-07-14 14:06:06 +0800534static int ahash_prepare_alg(struct ahash_alg *alg)
535{
536 struct crypto_alg *base = &alg->halg.base;
537
538 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
Russell King8996eaf2015-10-09 20:43:33 +0100539 alg->halg.statesize > PAGE_SIZE / 8 ||
540 alg->halg.statesize == 0)
Herbert Xu01c2dec2009-07-14 14:06:06 +0800541 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
Loc Ho004a4032008-05-14 20:41:47 +0800607MODULE_LICENSE("GPL");
608MODULE_DESCRIPTION("Asynchronous cryptographic hash type");