blob: 826cd7ab4d4a2ec830438b40e987e230bd03f32f [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>
Gideon Israel Dsouzad8c34b92016-12-31 21:26:23 +053026#include <linux/compiler.h>
Steffen Klassert6238cba2011-09-27 07:41:07 +020027#include <net/netlink.h>
Loc Ho004a4032008-05-14 20:41:47 +080028
29#include "internal.h"
30
Herbert Xu66f6ce52009-07-15 12:40:40 +080031struct ahash_request_priv {
32 crypto_completion_t complete;
33 void *data;
34 u8 *result;
Herbert Xuef0579b2017-04-10 17:27:57 +080035 u32 flags;
Herbert Xu66f6ce52009-07-15 12:40:40 +080036 void *ubuf[] CRYPTO_MINALIGN_ATTR;
37};
38
Herbert Xu88056ec2009-07-14 12:28:26 +080039static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
40{
41 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
42 halg);
43}
44
Herbert Xu20036252008-07-07 22:19:53 +080045static int hash_walk_next(struct crypto_hash_walk *walk)
46{
47 unsigned int alignmask = walk->alignmask;
48 unsigned int offset = walk->offset;
49 unsigned int nbytes = min(walk->entrylen,
50 ((unsigned int)(PAGE_SIZE)) - offset);
51
Herbert Xu75ecb232014-05-21 20:56:12 +080052 if (walk->flags & CRYPTO_ALG_ASYNC)
53 walk->data = kmap(walk->pg);
54 else
55 walk->data = kmap_atomic(walk->pg);
Herbert Xu20036252008-07-07 22:19:53 +080056 walk->data += offset;
57
Szilveszter Ördög23a75ee2010-08-06 09:26:38 +080058 if (offset & alignmask) {
59 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
Joshua I. Jamesb516d5142014-12-05 14:44:54 +090060
Szilveszter Ördög23a75ee2010-08-06 09:26:38 +080061 if (nbytes > unaligned)
62 nbytes = unaligned;
63 }
Herbert Xu20036252008-07-07 22:19:53 +080064
65 walk->entrylen -= nbytes;
66 return nbytes;
67}
68
69static int hash_walk_new_entry(struct crypto_hash_walk *walk)
70{
71 struct scatterlist *sg;
72
73 sg = walk->sg;
Herbert Xu20036252008-07-07 22:19:53 +080074 walk->offset = sg->offset;
Herbert Xu13f4bb72016-05-04 17:52:56 +080075 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
76 walk->offset = offset_in_page(walk->offset);
Herbert Xu20036252008-07-07 22:19:53 +080077 walk->entrylen = sg->length;
78
79 if (walk->entrylen > walk->total)
80 walk->entrylen = walk->total;
81 walk->total -= walk->entrylen;
82
83 return hash_walk_next(walk);
84}
85
86int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
87{
88 unsigned int alignmask = walk->alignmask;
89 unsigned int nbytes = walk->entrylen;
90
91 walk->data -= walk->offset;
92
93 if (nbytes && walk->offset & alignmask && !err) {
Herbert Xu20036252008-07-07 22:19:53 +080094 walk->offset = ALIGN(walk->offset, alignmask + 1);
95 walk->data += walk->offset;
96
97 nbytes = min(nbytes,
98 ((unsigned int)(PAGE_SIZE)) - walk->offset);
99 walk->entrylen -= nbytes;
100
101 return nbytes;
102 }
103
Herbert Xu75ecb232014-05-21 20:56:12 +0800104 if (walk->flags & CRYPTO_ALG_ASYNC)
105 kunmap(walk->pg);
106 else {
107 kunmap_atomic(walk->data);
108 /*
109 * The may sleep test only makes sense for sync users.
110 * Async users don't need to sleep here anyway.
111 */
112 crypto_yield(walk->flags);
113 }
Herbert Xu20036252008-07-07 22:19:53 +0800114
115 if (err)
116 return err;
117
Herbert Xud315a0e2009-05-31 23:09:22 +1000118 if (nbytes) {
119 walk->offset = 0;
120 walk->pg++;
Herbert Xu20036252008-07-07 22:19:53 +0800121 return hash_walk_next(walk);
Herbert Xud315a0e2009-05-31 23:09:22 +1000122 }
Herbert Xu20036252008-07-07 22:19:53 +0800123
124 if (!walk->total)
125 return 0;
126
Cristian Stoica5be4d4c2015-01-20 10:06:16 +0200127 walk->sg = sg_next(walk->sg);
Herbert Xu20036252008-07-07 22:19:53 +0800128
129 return hash_walk_new_entry(walk);
130}
131EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
132
133int crypto_hash_walk_first(struct ahash_request *req,
134 struct crypto_hash_walk *walk)
135{
136 walk->total = req->nbytes;
137
Tim Chen6d9529c2014-07-10 16:18:08 -0700138 if (!walk->total) {
139 walk->entrylen = 0;
Herbert Xu20036252008-07-07 22:19:53 +0800140 return 0;
Tim Chen6d9529c2014-07-10 16:18:08 -0700141 }
Herbert Xu20036252008-07-07 22:19:53 +0800142
143 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
144 walk->sg = req->src;
Herbert Xu75ecb232014-05-21 20:56:12 +0800145 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
Herbert Xu20036252008-07-07 22:19:53 +0800146
147 return hash_walk_new_entry(walk);
148}
149EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
150
Herbert Xu75ecb232014-05-21 20:56:12 +0800151int crypto_ahash_walk_first(struct ahash_request *req,
152 struct crypto_hash_walk *walk)
153{
154 walk->total = req->nbytes;
155
Tim Chen6d9529c2014-07-10 16:18:08 -0700156 if (!walk->total) {
157 walk->entrylen = 0;
Herbert Xu75ecb232014-05-21 20:56:12 +0800158 return 0;
Tim Chen6d9529c2014-07-10 16:18:08 -0700159 }
Herbert Xu75ecb232014-05-21 20:56:12 +0800160
161 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
162 walk->sg = req->src;
163 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
164 walk->flags |= CRYPTO_ALG_ASYNC;
165
166 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
167
168 return hash_walk_new_entry(walk);
169}
170EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
171
Loc Ho004a4032008-05-14 20:41:47 +0800172static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
173 unsigned int keylen)
174{
Loc Ho004a4032008-05-14 20:41:47 +0800175 unsigned long alignmask = crypto_ahash_alignmask(tfm);
176 int ret;
177 u8 *buffer, *alignbuffer;
178 unsigned long absize;
179
180 absize = keylen + alignmask;
Herbert Xu093900c2009-07-14 21:48:35 +0800181 buffer = kmalloc(absize, GFP_KERNEL);
Loc Ho004a4032008-05-14 20:41:47 +0800182 if (!buffer)
183 return -ENOMEM;
184
185 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
186 memcpy(alignbuffer, key, keylen);
Herbert Xua70c5222009-07-15 20:39:05 +0800187 ret = tfm->setkey(tfm, alignbuffer, keylen);
Herbert Xu8c32c512009-07-14 21:35:36 +0800188 kzfree(buffer);
Loc Ho004a4032008-05-14 20:41:47 +0800189 return ret;
190}
191
Herbert Xu66f6ce52009-07-15 12:40:40 +0800192int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
Loc Ho004a4032008-05-14 20:41:47 +0800193 unsigned int keylen)
194{
Loc Ho004a4032008-05-14 20:41:47 +0800195 unsigned long alignmask = crypto_ahash_alignmask(tfm);
196
197 if ((unsigned long)key & alignmask)
198 return ahash_setkey_unaligned(tfm, key, keylen);
199
Herbert Xua70c5222009-07-15 20:39:05 +0800200 return tfm->setkey(tfm, key, keylen);
Loc Ho004a4032008-05-14 20:41:47 +0800201}
Herbert Xu66f6ce52009-07-15 12:40:40 +0800202EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
Loc Ho004a4032008-05-14 20:41:47 +0800203
Herbert Xu3751f402008-11-08 08:56:57 +0800204static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
205 unsigned int keylen)
206{
207 return -ENOSYS;
208}
209
Herbert Xu66f6ce52009-07-15 12:40:40 +0800210static inline unsigned int ahash_align_buffer_size(unsigned len,
211 unsigned long mask)
212{
213 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
214}
215
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100216static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
Herbert Xu66f6ce52009-07-15 12:40:40 +0800217{
218 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
219 unsigned long alignmask = crypto_ahash_alignmask(tfm);
220 unsigned int ds = crypto_ahash_digestsize(tfm);
221 struct ahash_request_priv *priv;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800222
223 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
224 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
Steffen Klassert5befbd52009-07-24 13:56:31 +0800225 GFP_KERNEL : GFP_ATOMIC);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800226 if (!priv)
227 return -ENOMEM;
228
Marek Vasutab6bf4e2014-03-14 02:37:04 +0100229 /*
230 * WARNING: Voodoo programming below!
231 *
232 * The code below is obscure and hard to understand, thus explanation
233 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
234 * to understand the layout of structures used here!
235 *
236 * The code here will replace portions of the ORIGINAL request with
237 * pointers to new code and buffers so the hashing operation can store
238 * the result in aligned buffer. We will call the modified request
239 * an ADJUSTED request.
240 *
241 * The newly mangled request will look as such:
242 *
243 * req {
244 * .result = ADJUSTED[new aligned buffer]
245 * .base.complete = ADJUSTED[pointer to completion function]
246 * .base.data = ADJUSTED[*req (pointer to self)]
247 * .priv = ADJUSTED[new priv] {
248 * .result = ORIGINAL(result)
249 * .complete = ORIGINAL(base.complete)
250 * .data = ORIGINAL(base.data)
251 * }
252 */
253
Herbert Xu66f6ce52009-07-15 12:40:40 +0800254 priv->result = req->result;
255 priv->complete = req->base.complete;
256 priv->data = req->base.data;
Herbert Xuef0579b2017-04-10 17:27:57 +0800257 priv->flags = req->base.flags;
258
Marek Vasutab6bf4e2014-03-14 02:37:04 +0100259 /*
260 * WARNING: We do not backup req->priv here! The req->priv
261 * is for internal use of the Crypto API and the
262 * user must _NOT_ _EVER_ depend on it's content!
263 */
Herbert Xu66f6ce52009-07-15 12:40:40 +0800264
265 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100266 req->base.complete = cplt;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800267 req->base.data = req;
268 req->priv = priv;
269
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100270 return 0;
271}
272
Herbert Xuef0579b2017-04-10 17:27:57 +0800273static void ahash_restore_req(struct ahash_request *req, int err)
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100274{
275 struct ahash_request_priv *priv = req->priv;
276
Herbert Xuef0579b2017-04-10 17:27:57 +0800277 if (!err)
278 memcpy(priv->result, req->result,
279 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
280
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100281 /* Restore the original crypto request. */
282 req->result = priv->result;
Herbert Xuef0579b2017-04-10 17:27:57 +0800283
284 ahash_request_set_callback(req, priv->flags,
285 priv->complete, priv->data);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100286 req->priv = NULL;
287
288 /* Free the req->priv.priv from the ADJUSTED request. */
289 kzfree(priv);
290}
291
Herbert Xuef0579b2017-04-10 17:27:57 +0800292static void ahash_notify_einprogress(struct ahash_request *req)
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100293{
294 struct ahash_request_priv *priv = req->priv;
Herbert Xuef0579b2017-04-10 17:27:57 +0800295 struct crypto_async_request oreq;
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100296
Herbert Xuef0579b2017-04-10 17:27:57 +0800297 oreq.data = priv->data;
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100298
Herbert Xuef0579b2017-04-10 17:27:57 +0800299 priv->complete(&oreq, -EINPROGRESS);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100300}
301
302static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
303{
304 struct ahash_request *areq = req->data;
305
Herbert Xuef0579b2017-04-10 17:27:57 +0800306 if (err == -EINPROGRESS) {
307 ahash_notify_einprogress(areq);
308 return;
309 }
310
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100311 /*
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 */
Herbert Xuef0579b2017-04-10 17:27:57 +0800321 ahash_restore_req(areq, err);
Marek Vasut1ffc9fb2014-03-14 02:37:05 +0100322
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
Herbert Xu66f6ce52009-07-15 12:40:40 +0800336 err = op(req);
Herbert Xuef0579b2017-04-10 17:27:57 +0800337 if (err == -EINPROGRESS ||
338 (err == -EBUSY && (ahash_request_flags(req) &
339 CRYPTO_TFM_REQ_MAY_BACKLOG)))
340 return err;
341
342 ahash_restore_req(req, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800343
344 return err;
345}
346
347static int crypto_ahash_op(struct ahash_request *req,
348 int (*op)(struct ahash_request *))
349{
350 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
351 unsigned long alignmask = crypto_ahash_alignmask(tfm);
352
353 if ((unsigned long)req->result & alignmask)
354 return ahash_op_unaligned(req, op);
355
356 return op(req);
357}
358
359int crypto_ahash_final(struct ahash_request *req)
360{
361 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
362}
363EXPORT_SYMBOL_GPL(crypto_ahash_final);
364
365int crypto_ahash_finup(struct ahash_request *req)
366{
367 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
368}
369EXPORT_SYMBOL_GPL(crypto_ahash_finup);
370
371int crypto_ahash_digest(struct ahash_request *req)
372{
373 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
374}
375EXPORT_SYMBOL_GPL(crypto_ahash_digest);
376
Herbert Xu66f6ce52009-07-15 12:40:40 +0800377static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
378{
379 struct ahash_request *areq = req->data;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800380
Herbert Xuef0579b2017-04-10 17:27:57 +0800381 if (err == -EINPROGRESS)
382 return;
383
384 ahash_restore_req(areq, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800385
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100386 areq->base.complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800387}
388
389static int ahash_def_finup_finish1(struct ahash_request *req, int err)
390{
391 if (err)
392 goto out;
393
394 req->base.complete = ahash_def_finup_done2;
Herbert Xuef0579b2017-04-10 17:27:57 +0800395
Herbert Xu66f6ce52009-07-15 12:40:40 +0800396 err = crypto_ahash_reqtfm(req)->final(req);
Herbert Xuef0579b2017-04-10 17:27:57 +0800397 if (err == -EINPROGRESS ||
398 (err == -EBUSY && (ahash_request_flags(req) &
399 CRYPTO_TFM_REQ_MAY_BACKLOG)))
400 return err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800401
402out:
Herbert Xuef0579b2017-04-10 17:27:57 +0800403 ahash_restore_req(req, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800404 return err;
405}
406
407static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
408{
409 struct ahash_request *areq = req->data;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800410
Herbert Xuef0579b2017-04-10 17:27:57 +0800411 if (err == -EINPROGRESS) {
412 ahash_notify_einprogress(areq);
413 return;
414 }
415
416 areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
417
Herbert Xu66f6ce52009-07-15 12:40:40 +0800418 err = ahash_def_finup_finish1(areq, err);
Herbert Xuef0579b2017-04-10 17:27:57 +0800419 if (areq->priv)
420 return;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800421
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100422 areq->base.complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800423}
424
425static int ahash_def_finup(struct ahash_request *req)
426{
427 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100428 int err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800429
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100430 err = ahash_save_req(req, ahash_def_finup_done1);
431 if (err)
432 return err;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800433
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100434 err = tfm->update(req);
Herbert Xuef0579b2017-04-10 17:27:57 +0800435 if (err == -EINPROGRESS ||
436 (err == -EBUSY && (ahash_request_flags(req) &
437 CRYPTO_TFM_REQ_MAY_BACKLOG)))
438 return err;
439
Marek Vasutd4a7a0f2014-03-14 02:37:06 +0100440 return ahash_def_finup_finish1(req, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800441}
442
443static int ahash_no_export(struct ahash_request *req, void *out)
444{
445 return -ENOSYS;
446}
447
448static int ahash_no_import(struct ahash_request *req, const void *in)
449{
450 return -ENOSYS;
451}
452
Herbert Xu88056ec2009-07-14 12:28:26 +0800453static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
454{
455 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
456 struct ahash_alg *alg = crypto_ahash_alg(hash);
Herbert Xu88056ec2009-07-14 12:28:26 +0800457
Herbert Xu66f6ce52009-07-15 12:40:40 +0800458 hash->setkey = ahash_nosetkey;
Herbert Xua5596d62016-01-08 21:28:26 +0800459 hash->has_setkey = false;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800460 hash->export = ahash_no_export;
461 hash->import = ahash_no_import;
462
Herbert Xu88056ec2009-07-14 12:28:26 +0800463 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
464 return crypto_init_shash_ops_async(tfm);
465
Herbert Xu88056ec2009-07-14 12:28:26 +0800466 hash->init = alg->init;
467 hash->update = alg->update;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800468 hash->final = alg->final;
469 hash->finup = alg->finup ?: ahash_def_finup;
Herbert Xu88056ec2009-07-14 12:28:26 +0800470 hash->digest = alg->digest;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800471
Herbert Xua5596d62016-01-08 21:28:26 +0800472 if (alg->setkey) {
Herbert Xu66f6ce52009-07-15 12:40:40 +0800473 hash->setkey = alg->setkey;
Herbert Xua5596d62016-01-08 21:28:26 +0800474 hash->has_setkey = true;
475 }
Herbert Xu66f6ce52009-07-15 12:40:40 +0800476 if (alg->export)
477 hash->export = alg->export;
478 if (alg->import)
479 hash->import = alg->import;
Herbert Xu88056ec2009-07-14 12:28:26 +0800480
481 return 0;
482}
483
484static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
485{
Herbert Xu2495cf22016-06-29 18:03:47 +0800486 if (alg->cra_type != &crypto_ahash_type)
487 return sizeof(struct crypto_shash *);
Herbert Xu88056ec2009-07-14 12:28:26 +0800488
Herbert Xu2495cf22016-06-29 18:03:47 +0800489 return crypto_alg_extsize(alg);
Herbert Xu88056ec2009-07-14 12:28:26 +0800490}
491
Herbert Xu3acc8472011-11-03 23:46:07 +1100492#ifdef CONFIG_NET
Steffen Klassert6238cba2011-09-27 07:41:07 +0200493static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
494{
495 struct crypto_report_hash rhash;
496
Mathias Krause9a5467b2013-02-05 18:19:13 +0100497 strncpy(rhash.type, "ahash", sizeof(rhash.type));
Steffen Klassert6238cba2011-09-27 07:41:07 +0200498
499 rhash.blocksize = alg->cra_blocksize;
500 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
501
David S. Miller6662df32012-04-01 20:19:05 -0400502 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
503 sizeof(struct crypto_report_hash), &rhash))
504 goto nla_put_failure;
Steffen Klassert6238cba2011-09-27 07:41:07 +0200505 return 0;
506
507nla_put_failure:
508 return -EMSGSIZE;
509}
Herbert Xu3acc8472011-11-03 23:46:07 +1100510#else
511static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
512{
513 return -ENOSYS;
514}
515#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200516
Loc Ho004a4032008-05-14 20:41:47 +0800517static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
Gideon Israel Dsouzad8c34b92016-12-31 21:26:23 +0530518 __maybe_unused;
Loc Ho004a4032008-05-14 20:41:47 +0800519static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
520{
521 seq_printf(m, "type : ahash\n");
522 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
523 "yes" : "no");
524 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
Herbert Xu88056ec2009-07-14 12:28:26 +0800525 seq_printf(m, "digestsize : %u\n",
526 __crypto_hash_alg_common(alg)->digestsize);
Loc Ho004a4032008-05-14 20:41:47 +0800527}
528
529const struct crypto_type crypto_ahash_type = {
Herbert Xu88056ec2009-07-14 12:28:26 +0800530 .extsize = crypto_ahash_extsize,
531 .init_tfm = crypto_ahash_init_tfm,
Loc Ho004a4032008-05-14 20:41:47 +0800532#ifdef CONFIG_PROC_FS
533 .show = crypto_ahash_show,
534#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200535 .report = crypto_ahash_report,
Herbert Xu88056ec2009-07-14 12:28:26 +0800536 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
537 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
538 .type = CRYPTO_ALG_TYPE_AHASH,
539 .tfmsize = offsetof(struct crypto_ahash, base),
Loc Ho004a4032008-05-14 20:41:47 +0800540};
541EXPORT_SYMBOL_GPL(crypto_ahash_type);
542
Herbert Xu88056ec2009-07-14 12:28:26 +0800543struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
544 u32 mask)
545{
546 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
547}
548EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
549
Herbert Xu8d18e342016-01-23 13:52:40 +0800550int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
551{
552 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
553}
554EXPORT_SYMBOL_GPL(crypto_has_ahash);
555
Herbert Xu01c2dec2009-07-14 14:06:06 +0800556static int ahash_prepare_alg(struct ahash_alg *alg)
557{
558 struct crypto_alg *base = &alg->halg.base;
559
560 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
Russell King8996eaf2015-10-09 20:43:33 +0100561 alg->halg.statesize > PAGE_SIZE / 8 ||
562 alg->halg.statesize == 0)
Herbert Xu01c2dec2009-07-14 14:06:06 +0800563 return -EINVAL;
564
565 base->cra_type = &crypto_ahash_type;
566 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
567 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
568
569 return 0;
570}
571
572int crypto_register_ahash(struct ahash_alg *alg)
573{
574 struct crypto_alg *base = &alg->halg.base;
575 int err;
576
577 err = ahash_prepare_alg(alg);
578 if (err)
579 return err;
580
581 return crypto_register_alg(base);
582}
583EXPORT_SYMBOL_GPL(crypto_register_ahash);
584
585int crypto_unregister_ahash(struct ahash_alg *alg)
586{
587 return crypto_unregister_alg(&alg->halg.base);
588}
589EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
590
591int ahash_register_instance(struct crypto_template *tmpl,
592 struct ahash_instance *inst)
593{
594 int err;
595
596 err = ahash_prepare_alg(&inst->alg);
597 if (err)
598 return err;
599
600 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
601}
602EXPORT_SYMBOL_GPL(ahash_register_instance);
603
604void ahash_free_instance(struct crypto_instance *inst)
605{
606 crypto_drop_spawn(crypto_instance_ctx(inst));
607 kfree(ahash_instance(inst));
608}
609EXPORT_SYMBOL_GPL(ahash_free_instance);
610
611int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
612 struct hash_alg_common *alg,
613 struct crypto_instance *inst)
614{
615 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
616 &crypto_ahash_type);
617}
618EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
619
620struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
621{
622 struct crypto_alg *alg;
623
624 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
625 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
626}
627EXPORT_SYMBOL_GPL(ahash_attr_alg);
628
Loc Ho004a4032008-05-14 20:41:47 +0800629MODULE_LICENSE("GPL");
630MODULE_DESCRIPTION("Asynchronous cryptographic hash type");