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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;
Herbert Xuc1047952017-04-10 17:27:57 +080034 u32 flags;
Herbert Xu66f6ce52009-07-15 12:40:40 +080035 void *ubuf[] CRYPTO_MINALIGN_ATTR;
36};
37
Herbert Xu88056ec2009-07-14 12:28:26 +080038static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
39{
40 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
41 halg);
42}
43
Herbert Xu20036252008-07-07 22:19:53 +080044static int hash_walk_next(struct crypto_hash_walk *walk)
45{
46 unsigned int alignmask = walk->alignmask;
47 unsigned int offset = walk->offset;
48 unsigned int nbytes = min(walk->entrylen,
49 ((unsigned int)(PAGE_SIZE)) - offset);
50
Herbert Xu75ecb232014-05-21 20:56:12 +080051 if (walk->flags & CRYPTO_ALG_ASYNC)
52 walk->data = kmap(walk->pg);
53 else
54 walk->data = kmap_atomic(walk->pg);
Herbert Xu20036252008-07-07 22:19:53 +080055 walk->data += offset;
56
Szilveszter Ördög23a75ee2010-08-06 09:26:38 +080057 if (offset & alignmask) {
58 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
Joshua I. Jamesb516d512014-12-05 14:44:54 +090059
Szilveszter Ördög23a75ee2010-08-06 09:26:38 +080060 if (nbytes > unaligned)
61 nbytes = unaligned;
62 }
Herbert Xu20036252008-07-07 22:19:53 +080063
64 walk->entrylen -= nbytes;
65 return nbytes;
66}
67
68static int hash_walk_new_entry(struct crypto_hash_walk *walk)
69{
70 struct scatterlist *sg;
71
72 sg = walk->sg;
Herbert Xu20036252008-07-07 22:19:53 +080073 walk->offset = sg->offset;
Herbert Xu13f4bb72016-05-04 17:52:56 +080074 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
75 walk->offset = offset_in_page(walk->offset);
Herbert Xu20036252008-07-07 22:19:53 +080076 walk->entrylen = sg->length;
77
78 if (walk->entrylen > walk->total)
79 walk->entrylen = walk->total;
80 walk->total -= walk->entrylen;
81
82 return hash_walk_next(walk);
83}
84
85int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
86{
87 unsigned int alignmask = walk->alignmask;
88 unsigned int nbytes = walk->entrylen;
89
90 walk->data -= walk->offset;
91
92 if (nbytes && walk->offset & alignmask && !err) {
Herbert Xu20036252008-07-07 22:19:53 +080093 walk->offset = ALIGN(walk->offset, alignmask + 1);
94 walk->data += walk->offset;
95
96 nbytes = min(nbytes,
97 ((unsigned int)(PAGE_SIZE)) - walk->offset);
98 walk->entrylen -= nbytes;
99
100 return nbytes;
101 }
102
Herbert Xu75ecb232014-05-21 20:56:12 +0800103 if (walk->flags & CRYPTO_ALG_ASYNC)
104 kunmap(walk->pg);
105 else {
106 kunmap_atomic(walk->data);
107 /*
108 * The may sleep test only makes sense for sync users.
109 * Async users don't need to sleep here anyway.
110 */
111 crypto_yield(walk->flags);
112 }
Herbert Xu20036252008-07-07 22:19:53 +0800113
114 if (err)
115 return err;
116
Herbert Xud315a0e2009-05-31 23:09:22 +1000117 if (nbytes) {
118 walk->offset = 0;
119 walk->pg++;
Herbert Xu20036252008-07-07 22:19:53 +0800120 return hash_walk_next(walk);
Herbert Xud315a0e2009-05-31 23:09:22 +1000121 }
Herbert Xu20036252008-07-07 22:19:53 +0800122
123 if (!walk->total)
124 return 0;
125
Cristian Stoica5be4d4c2015-01-20 10:06:16 +0200126 walk->sg = sg_next(walk->sg);
Herbert Xu20036252008-07-07 22:19:53 +0800127
128 return hash_walk_new_entry(walk);
129}
130EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
131
132int crypto_hash_walk_first(struct ahash_request *req,
133 struct crypto_hash_walk *walk)
134{
135 walk->total = req->nbytes;
136
Tim Chen6d9529c2014-07-10 16:18:08 -0700137 if (!walk->total) {
138 walk->entrylen = 0;
Herbert Xu20036252008-07-07 22:19:53 +0800139 return 0;
Tim Chen6d9529c2014-07-10 16:18:08 -0700140 }
Herbert Xu20036252008-07-07 22:19:53 +0800141
142 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
143 walk->sg = req->src;
Herbert Xu75ecb232014-05-21 20:56:12 +0800144 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
Herbert Xu20036252008-07-07 22:19:53 +0800145
146 return hash_walk_new_entry(walk);
147}
148EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
149
Herbert Xu75ecb232014-05-21 20:56:12 +0800150int crypto_ahash_walk_first(struct ahash_request *req,
151 struct crypto_hash_walk *walk)
152{
153 walk->total = req->nbytes;
154
Tim Chen6d9529c2014-07-10 16:18:08 -0700155 if (!walk->total) {
156 walk->entrylen = 0;
Herbert Xu75ecb232014-05-21 20:56:12 +0800157 return 0;
Tim Chen6d9529c2014-07-10 16:18:08 -0700158 }
Herbert Xu75ecb232014-05-21 20:56:12 +0800159
160 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
161 walk->sg = req->src;
162 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
163 walk->flags |= CRYPTO_ALG_ASYNC;
164
165 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
166
167 return hash_walk_new_entry(walk);
168}
169EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
170
Loc Ho004a4032008-05-14 20:41:47 +0800171static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
172 unsigned int keylen)
173{
Loc Ho004a4032008-05-14 20:41:47 +0800174 unsigned long alignmask = crypto_ahash_alignmask(tfm);
175 int ret;
176 u8 *buffer, *alignbuffer;
177 unsigned long absize;
178
179 absize = keylen + alignmask;
Herbert Xu093900c2009-07-14 21:48:35 +0800180 buffer = kmalloc(absize, GFP_KERNEL);
Loc Ho004a4032008-05-14 20:41:47 +0800181 if (!buffer)
182 return -ENOMEM;
183
184 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
185 memcpy(alignbuffer, key, keylen);
Herbert Xua70c5222009-07-15 20:39:05 +0800186 ret = tfm->setkey(tfm, alignbuffer, keylen);
Herbert Xu8c32c512009-07-14 21:35:36 +0800187 kzfree(buffer);
Loc Ho004a4032008-05-14 20:41:47 +0800188 return ret;
189}
190
Herbert Xu66f6ce52009-07-15 12:40:40 +0800191int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
Loc Ho004a4032008-05-14 20:41:47 +0800192 unsigned int keylen)
193{
Loc Ho004a4032008-05-14 20:41:47 +0800194 unsigned long alignmask = crypto_ahash_alignmask(tfm);
195
196 if ((unsigned long)key & alignmask)
197 return ahash_setkey_unaligned(tfm, key, keylen);
198
Herbert Xua70c5222009-07-15 20:39:05 +0800199 return tfm->setkey(tfm, key, keylen);
Loc Ho004a4032008-05-14 20:41:47 +0800200}
Herbert Xu66f6ce52009-07-15 12:40:40 +0800201EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
Loc Ho004a4032008-05-14 20:41:47 +0800202
Herbert Xu3751f402008-11-08 08:56:57 +0800203static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
204 unsigned int keylen)
205{
206 return -ENOSYS;
207}
208
Herbert Xu66f6ce52009-07-15 12:40:40 +0800209static inline unsigned int ahash_align_buffer_size(unsigned len,
210 unsigned long mask)
211{
212 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
213}
214
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100215static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
Herbert Xu66f6ce52009-07-15 12:40:40 +0800216{
217 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
218 unsigned long alignmask = crypto_ahash_alignmask(tfm);
219 unsigned int ds = crypto_ahash_digestsize(tfm);
220 struct ahash_request_priv *priv;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800221
222 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
223 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
Steffen Klassert5befbd52009-07-24 13:56:31 +0800224 GFP_KERNEL : GFP_ATOMIC);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800225 if (!priv)
226 return -ENOMEM;
227
Marek Vasutab6bf4e2014-03-14 02:37:04 +0100228 /*
229 * WARNING: Voodoo programming below!
230 *
231 * The code below is obscure and hard to understand, thus explanation
232 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
233 * to understand the layout of structures used here!
234 *
235 * The code here will replace portions of the ORIGINAL request with
236 * pointers to new code and buffers so the hashing operation can store
237 * the result in aligned buffer. We will call the modified request
238 * an ADJUSTED request.
239 *
240 * The newly mangled request will look as such:
241 *
242 * req {
243 * .result = ADJUSTED[new aligned buffer]
244 * .base.complete = ADJUSTED[pointer to completion function]
245 * .base.data = ADJUSTED[*req (pointer to self)]
246 * .priv = ADJUSTED[new priv] {
247 * .result = ORIGINAL(result)
248 * .complete = ORIGINAL(base.complete)
249 * .data = ORIGINAL(base.data)
250 * }
251 */
252
Herbert Xu66f6ce52009-07-15 12:40:40 +0800253 priv->result = req->result;
254 priv->complete = req->base.complete;
255 priv->data = req->base.data;
Herbert Xuc1047952017-04-10 17:27:57 +0800256 priv->flags = req->base.flags;
257
Marek Vasutab6bf4e2014-03-14 02:37:04 +0100258 /*
259 * WARNING: We do not backup req->priv here! The req->priv
260 * is for internal use of the Crypto API and the
261 * user must _NOT_ _EVER_ depend on it's content!
262 */
Herbert Xu66f6ce52009-07-15 12:40:40 +0800263
264 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100265 req->base.complete = cplt;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800266 req->base.data = req;
267 req->priv = priv;
268
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100269 return 0;
270}
271
Herbert Xuc1047952017-04-10 17:27:57 +0800272static void ahash_restore_req(struct ahash_request *req, int err)
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100273{
274 struct ahash_request_priv *priv = req->priv;
275
Herbert Xuc1047952017-04-10 17:27:57 +0800276 if (!err)
277 memcpy(priv->result, req->result,
278 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
279
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100280 /* Restore the original crypto request. */
281 req->result = priv->result;
Herbert Xuc1047952017-04-10 17:27:57 +0800282
283 ahash_request_set_callback(req, priv->flags,
284 priv->complete, priv->data);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100285 req->priv = NULL;
286
287 /* Free the req->priv.priv from the ADJUSTED request. */
288 kzfree(priv);
289}
290
Herbert Xuc1047952017-04-10 17:27:57 +0800291static void ahash_notify_einprogress(struct ahash_request *req)
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100292{
293 struct ahash_request_priv *priv = req->priv;
Herbert Xuc1047952017-04-10 17:27:57 +0800294 struct crypto_async_request oreq;
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100295
Herbert Xuc1047952017-04-10 17:27:57 +0800296 oreq.data = priv->data;
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100297
Herbert Xuc1047952017-04-10 17:27:57 +0800298 priv->complete(&oreq, -EINPROGRESS);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100299}
300
301static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
302{
303 struct ahash_request *areq = req->data;
304
Herbert Xuc1047952017-04-10 17:27:57 +0800305 if (err == -EINPROGRESS) {
306 ahash_notify_einprogress(areq);
307 return;
308 }
309
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100310 /*
311 * Restore the original request, see ahash_op_unaligned() for what
312 * goes where.
313 *
314 * The "struct ahash_request *req" here is in fact the "req.base"
315 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
316 * is a pointer to self, it is also the ADJUSTED "req" .
317 */
318
319 /* First copy req->result into req->priv.result */
Herbert Xuc1047952017-04-10 17:27:57 +0800320 ahash_restore_req(areq, err);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100321
322 /* Complete the ORIGINAL request. */
323 areq->base.complete(&areq->base, err);
324}
325
326static int ahash_op_unaligned(struct ahash_request *req,
327 int (*op)(struct ahash_request *))
328{
329 int err;
330
331 err = ahash_save_req(req, ahash_op_unaligned_done);
332 if (err)
333 return err;
334
Herbert Xu66f6ce52009-07-15 12:40:40 +0800335 err = op(req);
Herbert Xuc1047952017-04-10 17:27:57 +0800336 if (err == -EINPROGRESS ||
337 (err == -EBUSY && (ahash_request_flags(req) &
338 CRYPTO_TFM_REQ_MAY_BACKLOG)))
339 return err;
340
341 ahash_restore_req(req, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800342
343 return err;
344}
345
346static int crypto_ahash_op(struct ahash_request *req,
347 int (*op)(struct ahash_request *))
348{
349 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
350 unsigned long alignmask = crypto_ahash_alignmask(tfm);
351
352 if ((unsigned long)req->result & alignmask)
353 return ahash_op_unaligned(req, op);
354
355 return op(req);
356}
357
358int crypto_ahash_final(struct ahash_request *req)
359{
360 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
361}
362EXPORT_SYMBOL_GPL(crypto_ahash_final);
363
364int crypto_ahash_finup(struct ahash_request *req)
365{
366 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
367}
368EXPORT_SYMBOL_GPL(crypto_ahash_finup);
369
370int crypto_ahash_digest(struct ahash_request *req)
371{
372 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
373}
374EXPORT_SYMBOL_GPL(crypto_ahash_digest);
375
Herbert Xu66f6ce52009-07-15 12:40:40 +0800376static 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
Herbert Xuc1047952017-04-10 17:27:57 +0800380 if (err == -EINPROGRESS)
381 return;
382
383 ahash_restore_req(areq, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800384
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100385 areq->base.complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800386}
387
388static int ahash_def_finup_finish1(struct ahash_request *req, int err)
389{
390 if (err)
391 goto out;
392
393 req->base.complete = ahash_def_finup_done2;
Herbert Xuc1047952017-04-10 17:27:57 +0800394
Herbert Xu66f6ce52009-07-15 12:40:40 +0800395 err = crypto_ahash_reqtfm(req)->final(req);
Herbert Xuc1047952017-04-10 17:27:57 +0800396 if (err == -EINPROGRESS ||
397 (err == -EBUSY && (ahash_request_flags(req) &
398 CRYPTO_TFM_REQ_MAY_BACKLOG)))
399 return err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800400
401out:
Herbert Xuc1047952017-04-10 17:27:57 +0800402 ahash_restore_req(req, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800403 return err;
404}
405
406static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
407{
408 struct ahash_request *areq = req->data;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800409
Herbert Xuc1047952017-04-10 17:27:57 +0800410 if (err == -EINPROGRESS) {
411 ahash_notify_einprogress(areq);
412 return;
413 }
414
415 areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
416
Herbert Xu66f6ce52009-07-15 12:40:40 +0800417 err = ahash_def_finup_finish1(areq, err);
Herbert Xuc1047952017-04-10 17:27:57 +0800418 if (areq->priv)
419 return;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800420
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100421 areq->base.complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800422}
423
424static int ahash_def_finup(struct ahash_request *req)
425{
426 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100427 int err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800428
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100429 err = ahash_save_req(req, ahash_def_finup_done1);
430 if (err)
431 return err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800432
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100433 err = tfm->update(req);
Herbert Xuc1047952017-04-10 17:27:57 +0800434 if (err == -EINPROGRESS ||
435 (err == -EBUSY && (ahash_request_flags(req) &
436 CRYPTO_TFM_REQ_MAY_BACKLOG)))
437 return err;
438
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100439 return ahash_def_finup_finish1(req, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800440}
441
442static int ahash_no_export(struct ahash_request *req, void *out)
443{
444 return -ENOSYS;
445}
446
447static int ahash_no_import(struct ahash_request *req, const void *in)
448{
449 return -ENOSYS;
450}
451
Herbert Xu88056ec2009-07-14 12:28:26 +0800452static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
453{
454 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
455 struct ahash_alg *alg = crypto_ahash_alg(hash);
Herbert Xu88056ec2009-07-14 12:28:26 +0800456
Herbert Xu66f6ce52009-07-15 12:40:40 +0800457 hash->setkey = ahash_nosetkey;
Herbert Xua5596d62016-01-08 21:28:26 +0800458 hash->has_setkey = false;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800459 hash->export = ahash_no_export;
460 hash->import = ahash_no_import;
461
Herbert Xu88056ec2009-07-14 12:28:26 +0800462 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
463 return crypto_init_shash_ops_async(tfm);
464
Herbert Xu88056ec2009-07-14 12:28:26 +0800465 hash->init = alg->init;
466 hash->update = alg->update;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800467 hash->final = alg->final;
468 hash->finup = alg->finup ?: ahash_def_finup;
Herbert Xu88056ec2009-07-14 12:28:26 +0800469 hash->digest = alg->digest;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800470
Herbert Xua5596d62016-01-08 21:28:26 +0800471 if (alg->setkey) {
Herbert Xu66f6ce52009-07-15 12:40:40 +0800472 hash->setkey = alg->setkey;
Herbert Xua5596d62016-01-08 21:28:26 +0800473 hash->has_setkey = true;
474 }
Herbert Xu66f6ce52009-07-15 12:40:40 +0800475 if (alg->export)
476 hash->export = alg->export;
477 if (alg->import)
478 hash->import = alg->import;
Herbert Xu88056ec2009-07-14 12:28:26 +0800479
480 return 0;
481}
482
483static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
484{
Herbert Xu2495cf22016-06-29 18:03:47 +0800485 if (alg->cra_type != &crypto_ahash_type)
486 return sizeof(struct crypto_shash *);
Herbert Xu88056ec2009-07-14 12:28:26 +0800487
Herbert Xu2495cf22016-06-29 18:03:47 +0800488 return crypto_alg_extsize(alg);
Herbert Xu88056ec2009-07-14 12:28:26 +0800489}
490
Herbert Xu3acc8472011-11-03 23:46:07 +1100491#ifdef CONFIG_NET
Steffen Klassert6238cba2011-09-27 07:41:07 +0200492static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
493{
494 struct crypto_report_hash rhash;
495
Mathias Krause9a5467b2013-02-05 18:19:13 +0100496 strncpy(rhash.type, "ahash", sizeof(rhash.type));
Steffen Klassert6238cba2011-09-27 07:41:07 +0200497
498 rhash.blocksize = alg->cra_blocksize;
499 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
500
David S. Miller6662df32012-04-01 20:19:05 -0400501 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
502 sizeof(struct crypto_report_hash), &rhash))
503 goto nla_put_failure;
Steffen Klassert6238cba2011-09-27 07:41:07 +0200504 return 0;
505
506nla_put_failure:
507 return -EMSGSIZE;
508}
Herbert Xu3acc8472011-11-03 23:46:07 +1100509#else
510static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
511{
512 return -ENOSYS;
513}
514#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200515
Loc Ho004a4032008-05-14 20:41:47 +0800516static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
517 __attribute__ ((unused));
518static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
519{
520 seq_printf(m, "type : ahash\n");
521 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
522 "yes" : "no");
523 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
Herbert Xu88056ec2009-07-14 12:28:26 +0800524 seq_printf(m, "digestsize : %u\n",
525 __crypto_hash_alg_common(alg)->digestsize);
Loc Ho004a4032008-05-14 20:41:47 +0800526}
527
528const struct crypto_type crypto_ahash_type = {
Herbert Xu88056ec2009-07-14 12:28:26 +0800529 .extsize = crypto_ahash_extsize,
530 .init_tfm = crypto_ahash_init_tfm,
Loc Ho004a4032008-05-14 20:41:47 +0800531#ifdef CONFIG_PROC_FS
532 .show = crypto_ahash_show,
533#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200534 .report = crypto_ahash_report,
Herbert Xu88056ec2009-07-14 12:28:26 +0800535 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
536 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
537 .type = CRYPTO_ALG_TYPE_AHASH,
538 .tfmsize = offsetof(struct crypto_ahash, base),
Loc Ho004a4032008-05-14 20:41:47 +0800539};
540EXPORT_SYMBOL_GPL(crypto_ahash_type);
541
Herbert Xu88056ec2009-07-14 12:28:26 +0800542struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
543 u32 mask)
544{
545 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
546}
547EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
548
Herbert Xu8d18e342016-01-23 13:52:40 +0800549int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
550{
551 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
552}
553EXPORT_SYMBOL_GPL(crypto_has_ahash);
554
Herbert Xu01c2dec2009-07-14 14:06:06 +0800555static int ahash_prepare_alg(struct ahash_alg *alg)
556{
557 struct crypto_alg *base = &alg->halg.base;
558
559 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
Russell King8996eaf2015-10-09 20:43:33 +0100560 alg->halg.statesize > PAGE_SIZE / 8 ||
561 alg->halg.statesize == 0)
Herbert Xu01c2dec2009-07-14 14:06:06 +0800562 return -EINVAL;
563
564 base->cra_type = &crypto_ahash_type;
565 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
566 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
567
568 return 0;
569}
570
571int crypto_register_ahash(struct ahash_alg *alg)
572{
573 struct crypto_alg *base = &alg->halg.base;
574 int err;
575
576 err = ahash_prepare_alg(alg);
577 if (err)
578 return err;
579
580 return crypto_register_alg(base);
581}
582EXPORT_SYMBOL_GPL(crypto_register_ahash);
583
584int crypto_unregister_ahash(struct ahash_alg *alg)
585{
586 return crypto_unregister_alg(&alg->halg.base);
587}
588EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
589
590int ahash_register_instance(struct crypto_template *tmpl,
591 struct ahash_instance *inst)
592{
593 int err;
594
595 err = ahash_prepare_alg(&inst->alg);
596 if (err)
597 return err;
598
599 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
600}
601EXPORT_SYMBOL_GPL(ahash_register_instance);
602
603void ahash_free_instance(struct crypto_instance *inst)
604{
605 crypto_drop_spawn(crypto_instance_ctx(inst));
606 kfree(ahash_instance(inst));
607}
608EXPORT_SYMBOL_GPL(ahash_free_instance);
609
610int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
611 struct hash_alg_common *alg,
612 struct crypto_instance *inst)
613{
614 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
615 &crypto_ahash_type);
616}
617EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
618
619struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
620{
621 struct crypto_alg *alg;
622
623 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
624 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
625}
626EXPORT_SYMBOL_GPL(ahash_attr_alg);
627
Loc Ho004a4032008-05-14 20:41:47 +0800628MODULE_LICENSE("GPL");
629MODULE_DESCRIPTION("Asynchronous cryptographic hash type");