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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>
Loc Ho004a4032008-05-14 20:41:47 +080018#include <linux/err.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <linux/seq_file.h>
Steffen Klassert6238cba2011-09-27 07:41:07 +020024#include <linux/cryptouser.h>
25#include <net/netlink.h>
Loc Ho004a4032008-05-14 20:41:47 +080026
27#include "internal.h"
28
Herbert Xu66f6ce52009-07-15 12:40:40 +080029struct ahash_request_priv {
30 crypto_completion_t complete;
31 void *data;
32 u8 *result;
33 void *ubuf[] CRYPTO_MINALIGN_ATTR;
34};
35
Herbert Xu88056ec2009-07-14 12:28:26 +080036static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
37{
38 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
39 halg);
40}
41
Herbert Xu20036252008-07-07 22:19:53 +080042static int hash_walk_next(struct crypto_hash_walk *walk)
43{
44 unsigned int alignmask = walk->alignmask;
45 unsigned int offset = walk->offset;
46 unsigned int nbytes = min(walk->entrylen,
47 ((unsigned int)(PAGE_SIZE)) - offset);
48
Cong Wangf0dfc0b2011-11-25 23:14:17 +080049 walk->data = kmap_atomic(walk->pg);
Herbert Xu20036252008-07-07 22:19:53 +080050 walk->data += offset;
51
Szilveszter Ördög23a75ee2010-08-06 09:26:38 +080052 if (offset & alignmask) {
53 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
54 if (nbytes > unaligned)
55 nbytes = unaligned;
56 }
Herbert Xu20036252008-07-07 22:19:53 +080057
58 walk->entrylen -= nbytes;
59 return nbytes;
60}
61
62static int hash_walk_new_entry(struct crypto_hash_walk *walk)
63{
64 struct scatterlist *sg;
65
66 sg = walk->sg;
67 walk->pg = sg_page(sg);
68 walk->offset = sg->offset;
69 walk->entrylen = sg->length;
70
71 if (walk->entrylen > walk->total)
72 walk->entrylen = walk->total;
73 walk->total -= walk->entrylen;
74
75 return hash_walk_next(walk);
76}
77
78int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
79{
80 unsigned int alignmask = walk->alignmask;
81 unsigned int nbytes = walk->entrylen;
82
83 walk->data -= walk->offset;
84
85 if (nbytes && walk->offset & alignmask && !err) {
Herbert Xu20036252008-07-07 22:19:53 +080086 walk->offset = ALIGN(walk->offset, alignmask + 1);
87 walk->data += walk->offset;
88
89 nbytes = min(nbytes,
90 ((unsigned int)(PAGE_SIZE)) - walk->offset);
91 walk->entrylen -= nbytes;
92
93 return nbytes;
94 }
95
Cong Wangf0dfc0b2011-11-25 23:14:17 +080096 kunmap_atomic(walk->data);
Herbert Xu20036252008-07-07 22:19:53 +080097 crypto_yield(walk->flags);
98
99 if (err)
100 return err;
101
Herbert Xud315a0e2009-05-31 23:09:22 +1000102 if (nbytes) {
103 walk->offset = 0;
104 walk->pg++;
Herbert Xu20036252008-07-07 22:19:53 +0800105 return hash_walk_next(walk);
Herbert Xud315a0e2009-05-31 23:09:22 +1000106 }
Herbert Xu20036252008-07-07 22:19:53 +0800107
108 if (!walk->total)
109 return 0;
110
111 walk->sg = scatterwalk_sg_next(walk->sg);
112
113 return hash_walk_new_entry(walk);
114}
115EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
116
117int crypto_hash_walk_first(struct ahash_request *req,
118 struct crypto_hash_walk *walk)
119{
120 walk->total = req->nbytes;
121
122 if (!walk->total)
123 return 0;
124
125 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
126 walk->sg = req->src;
127 walk->flags = req->base.flags;
128
129 return hash_walk_new_entry(walk);
130}
131EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
132
Herbert Xu5f7082e2008-08-31 22:21:09 +1000133int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
134 struct crypto_hash_walk *walk,
135 struct scatterlist *sg, unsigned int len)
136{
137 walk->total = len;
138
139 if (!walk->total)
140 return 0;
141
142 walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
143 walk->sg = sg;
144 walk->flags = hdesc->flags;
145
146 return hash_walk_new_entry(walk);
147}
148
Loc Ho004a4032008-05-14 20:41:47 +0800149static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
150 unsigned int keylen)
151{
Loc Ho004a4032008-05-14 20:41:47 +0800152 unsigned long alignmask = crypto_ahash_alignmask(tfm);
153 int ret;
154 u8 *buffer, *alignbuffer;
155 unsigned long absize;
156
157 absize = keylen + alignmask;
Herbert Xu093900c2009-07-14 21:48:35 +0800158 buffer = kmalloc(absize, GFP_KERNEL);
Loc Ho004a4032008-05-14 20:41:47 +0800159 if (!buffer)
160 return -ENOMEM;
161
162 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
163 memcpy(alignbuffer, key, keylen);
Herbert Xua70c5222009-07-15 20:39:05 +0800164 ret = tfm->setkey(tfm, alignbuffer, keylen);
Herbert Xu8c32c512009-07-14 21:35:36 +0800165 kzfree(buffer);
Loc Ho004a4032008-05-14 20:41:47 +0800166 return ret;
167}
168
Herbert Xu66f6ce52009-07-15 12:40:40 +0800169int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
Loc Ho004a4032008-05-14 20:41:47 +0800170 unsigned int keylen)
171{
Loc Ho004a4032008-05-14 20:41:47 +0800172 unsigned long alignmask = crypto_ahash_alignmask(tfm);
173
174 if ((unsigned long)key & alignmask)
175 return ahash_setkey_unaligned(tfm, key, keylen);
176
Herbert Xua70c5222009-07-15 20:39:05 +0800177 return tfm->setkey(tfm, key, keylen);
Loc Ho004a4032008-05-14 20:41:47 +0800178}
Herbert Xu66f6ce52009-07-15 12:40:40 +0800179EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
Loc Ho004a4032008-05-14 20:41:47 +0800180
Herbert Xu3751f402008-11-08 08:56:57 +0800181static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
182 unsigned int keylen)
183{
184 return -ENOSYS;
185}
186
Herbert Xu66f6ce52009-07-15 12:40:40 +0800187static inline unsigned int ahash_align_buffer_size(unsigned len,
188 unsigned long mask)
189{
190 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
191}
192
193static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
194{
195 struct ahash_request_priv *priv = req->priv;
196
197 if (err == -EINPROGRESS)
198 return;
199
200 if (!err)
201 memcpy(priv->result, req->result,
202 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
203
204 kzfree(priv);
205}
206
207static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
208{
209 struct ahash_request *areq = req->data;
210 struct ahash_request_priv *priv = areq->priv;
211 crypto_completion_t complete = priv->complete;
212 void *data = priv->data;
213
214 ahash_op_unaligned_finish(areq, err);
215
Marek Vasut1d9a3942013-12-10 20:26:19 +0100216 areq->base.complete = complete;
217 areq->base.data = data;
218
219 complete(&areq->base, err);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800220}
221
222static int ahash_op_unaligned(struct ahash_request *req,
223 int (*op)(struct ahash_request *))
224{
225 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
226 unsigned long alignmask = crypto_ahash_alignmask(tfm);
227 unsigned int ds = crypto_ahash_digestsize(tfm);
228 struct ahash_request_priv *priv;
229 int err;
230
231 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
232 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
Steffen Klassert5befbd52009-07-24 13:56:31 +0800233 GFP_KERNEL : GFP_ATOMIC);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800234 if (!priv)
235 return -ENOMEM;
236
237 priv->result = req->result;
238 priv->complete = req->base.complete;
239 priv->data = req->base.data;
240
241 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
242 req->base.complete = ahash_op_unaligned_done;
243 req->base.data = req;
244 req->priv = priv;
245
246 err = op(req);
247 ahash_op_unaligned_finish(req, err);
248
249 return err;
250}
251
252static int crypto_ahash_op(struct ahash_request *req,
253 int (*op)(struct ahash_request *))
254{
255 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
256 unsigned long alignmask = crypto_ahash_alignmask(tfm);
257
258 if ((unsigned long)req->result & alignmask)
259 return ahash_op_unaligned(req, op);
260
261 return op(req);
262}
263
264int crypto_ahash_final(struct ahash_request *req)
265{
266 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
267}
268EXPORT_SYMBOL_GPL(crypto_ahash_final);
269
270int crypto_ahash_finup(struct ahash_request *req)
271{
272 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
273}
274EXPORT_SYMBOL_GPL(crypto_ahash_finup);
275
276int crypto_ahash_digest(struct ahash_request *req)
277{
278 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
279}
280EXPORT_SYMBOL_GPL(crypto_ahash_digest);
281
282static void ahash_def_finup_finish2(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 kzfree(priv);
294}
295
296static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
297{
298 struct ahash_request *areq = req->data;
299 struct ahash_request_priv *priv = areq->priv;
300 crypto_completion_t complete = priv->complete;
301 void *data = priv->data;
302
303 ahash_def_finup_finish2(areq, err);
304
305 complete(data, err);
306}
307
308static int ahash_def_finup_finish1(struct ahash_request *req, int err)
309{
310 if (err)
311 goto out;
312
313 req->base.complete = ahash_def_finup_done2;
314 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
315 err = crypto_ahash_reqtfm(req)->final(req);
316
317out:
318 ahash_def_finup_finish2(req, err);
319 return err;
320}
321
322static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
323{
324 struct ahash_request *areq = req->data;
325 struct ahash_request_priv *priv = areq->priv;
326 crypto_completion_t complete = priv->complete;
327 void *data = priv->data;
328
329 err = ahash_def_finup_finish1(areq, err);
330
331 complete(data, err);
332}
333
334static int ahash_def_finup(struct ahash_request *req)
335{
336 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
337 unsigned long alignmask = crypto_ahash_alignmask(tfm);
338 unsigned int ds = crypto_ahash_digestsize(tfm);
339 struct ahash_request_priv *priv;
340
341 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
342 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
Steffen Klassert5befbd52009-07-24 13:56:31 +0800343 GFP_KERNEL : GFP_ATOMIC);
Herbert Xu66f6ce52009-07-15 12:40:40 +0800344 if (!priv)
345 return -ENOMEM;
346
347 priv->result = req->result;
348 priv->complete = req->base.complete;
349 priv->data = req->base.data;
350
351 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
352 req->base.complete = ahash_def_finup_done1;
353 req->base.data = req;
354 req->priv = priv;
355
356 return ahash_def_finup_finish1(req, tfm->update(req));
357}
358
359static int ahash_no_export(struct ahash_request *req, void *out)
360{
361 return -ENOSYS;
362}
363
364static int ahash_no_import(struct ahash_request *req, const void *in)
365{
366 return -ENOSYS;
367}
368
Herbert Xu88056ec2009-07-14 12:28:26 +0800369static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
370{
371 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
372 struct ahash_alg *alg = crypto_ahash_alg(hash);
Herbert Xu88056ec2009-07-14 12:28:26 +0800373
Herbert Xu66f6ce52009-07-15 12:40:40 +0800374 hash->setkey = ahash_nosetkey;
375 hash->export = ahash_no_export;
376 hash->import = ahash_no_import;
377
Herbert Xu88056ec2009-07-14 12:28:26 +0800378 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
379 return crypto_init_shash_ops_async(tfm);
380
Herbert Xu88056ec2009-07-14 12:28:26 +0800381 hash->init = alg->init;
382 hash->update = alg->update;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800383 hash->final = alg->final;
384 hash->finup = alg->finup ?: ahash_def_finup;
Herbert Xu88056ec2009-07-14 12:28:26 +0800385 hash->digest = alg->digest;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800386
387 if (alg->setkey)
388 hash->setkey = alg->setkey;
389 if (alg->export)
390 hash->export = alg->export;
391 if (alg->import)
392 hash->import = alg->import;
Herbert Xu88056ec2009-07-14 12:28:26 +0800393
394 return 0;
395}
396
397static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
398{
399 if (alg->cra_type == &crypto_ahash_type)
400 return alg->cra_ctxsize;
401
402 return sizeof(struct crypto_shash *);
403}
404
Herbert Xu3acc8472011-11-03 23:46:07 +1100405#ifdef CONFIG_NET
Steffen Klassert6238cba2011-09-27 07:41:07 +0200406static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
407{
408 struct crypto_report_hash rhash;
409
Mathias Krause9a5467b2013-02-05 18:19:13 +0100410 strncpy(rhash.type, "ahash", sizeof(rhash.type));
Steffen Klassert6238cba2011-09-27 07:41:07 +0200411
412 rhash.blocksize = alg->cra_blocksize;
413 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
414
David S. Miller6662df32012-04-01 20:19:05 -0400415 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
416 sizeof(struct crypto_report_hash), &rhash))
417 goto nla_put_failure;
Steffen Klassert6238cba2011-09-27 07:41:07 +0200418 return 0;
419
420nla_put_failure:
421 return -EMSGSIZE;
422}
Herbert Xu3acc8472011-11-03 23:46:07 +1100423#else
424static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
425{
426 return -ENOSYS;
427}
428#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200429
Loc Ho004a4032008-05-14 20:41:47 +0800430static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
431 __attribute__ ((unused));
432static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
433{
434 seq_printf(m, "type : ahash\n");
435 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
436 "yes" : "no");
437 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
Herbert Xu88056ec2009-07-14 12:28:26 +0800438 seq_printf(m, "digestsize : %u\n",
439 __crypto_hash_alg_common(alg)->digestsize);
Loc Ho004a4032008-05-14 20:41:47 +0800440}
441
442const struct crypto_type crypto_ahash_type = {
Herbert Xu88056ec2009-07-14 12:28:26 +0800443 .extsize = crypto_ahash_extsize,
444 .init_tfm = crypto_ahash_init_tfm,
Loc Ho004a4032008-05-14 20:41:47 +0800445#ifdef CONFIG_PROC_FS
446 .show = crypto_ahash_show,
447#endif
Steffen Klassert6238cba2011-09-27 07:41:07 +0200448 .report = crypto_ahash_report,
Herbert Xu88056ec2009-07-14 12:28:26 +0800449 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
450 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
451 .type = CRYPTO_ALG_TYPE_AHASH,
452 .tfmsize = offsetof(struct crypto_ahash, base),
Loc Ho004a4032008-05-14 20:41:47 +0800453};
454EXPORT_SYMBOL_GPL(crypto_ahash_type);
455
Herbert Xu88056ec2009-07-14 12:28:26 +0800456struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
457 u32 mask)
458{
459 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
460}
461EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
462
Herbert Xu01c2dec2009-07-14 14:06:06 +0800463static int ahash_prepare_alg(struct ahash_alg *alg)
464{
465 struct crypto_alg *base = &alg->halg.base;
466
467 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
468 alg->halg.statesize > PAGE_SIZE / 8)
469 return -EINVAL;
470
471 base->cra_type = &crypto_ahash_type;
472 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
473 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
474
475 return 0;
476}
477
478int crypto_register_ahash(struct ahash_alg *alg)
479{
480 struct crypto_alg *base = &alg->halg.base;
481 int err;
482
483 err = ahash_prepare_alg(alg);
484 if (err)
485 return err;
486
487 return crypto_register_alg(base);
488}
489EXPORT_SYMBOL_GPL(crypto_register_ahash);
490
491int crypto_unregister_ahash(struct ahash_alg *alg)
492{
493 return crypto_unregister_alg(&alg->halg.base);
494}
495EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
496
497int ahash_register_instance(struct crypto_template *tmpl,
498 struct ahash_instance *inst)
499{
500 int err;
501
502 err = ahash_prepare_alg(&inst->alg);
503 if (err)
504 return err;
505
506 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
507}
508EXPORT_SYMBOL_GPL(ahash_register_instance);
509
510void ahash_free_instance(struct crypto_instance *inst)
511{
512 crypto_drop_spawn(crypto_instance_ctx(inst));
513 kfree(ahash_instance(inst));
514}
515EXPORT_SYMBOL_GPL(ahash_free_instance);
516
517int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
518 struct hash_alg_common *alg,
519 struct crypto_instance *inst)
520{
521 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
522 &crypto_ahash_type);
523}
524EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
525
526struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
527{
528 struct crypto_alg *alg;
529
530 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
531 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
532}
533EXPORT_SYMBOL_GPL(ahash_attr_alg);
534
Loc Ho004a4032008-05-14 20:41:47 +0800535MODULE_LICENSE("GPL");
536MODULE_DESCRIPTION("Asynchronous cryptographic hash type");