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1/*
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
16#include <crypto/internal/hash.h>
17#include <crypto/scatterwalk.h>
18#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>
24#include <linux/cryptouser.h>
25#include <net/netlink.h>
26
27#include "internal.h"
28
29struct ahash_request_priv {
30 crypto_completion_t complete;
31 void *data;
32 u8 *result;
33 void *ubuf[] CRYPTO_MINALIGN_ATTR;
34};
35
36static 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
42static 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
49 walk->data = kmap_atomic(walk->pg);
50 walk->data += offset;
51
52 if (offset & alignmask) {
53 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
54 if (nbytes > unaligned)
55 nbytes = unaligned;
56 }
57
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) {
86 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
96 kunmap_atomic(walk->data);
97 crypto_yield(walk->flags);
98
99 if (err)
100 return err;
101
102 if (nbytes) {
103 walk->offset = 0;
104 walk->pg++;
105 return hash_walk_next(walk);
106 }
107
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
133int 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
149static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
150 unsigned int keylen)
151{
152 unsigned long alignmask = crypto_ahash_alignmask(tfm);
153 int ret;
154 u8 *buffer, *alignbuffer;
155 unsigned long absize;
156
157 absize = keylen + alignmask;
158 buffer = kmalloc(absize, GFP_KERNEL);
159 if (!buffer)
160 return -ENOMEM;
161
162 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
163 memcpy(alignbuffer, key, keylen);
164 ret = tfm->setkey(tfm, alignbuffer, keylen);
165 kzfree(buffer);
166 return ret;
167}
168
169int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
170 unsigned int keylen)
171{
172 unsigned long alignmask = crypto_ahash_alignmask(tfm);
173
174 if ((unsigned long)key & alignmask)
175 return ahash_setkey_unaligned(tfm, key, keylen);
176
177 return tfm->setkey(tfm, key, keylen);
178}
179EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
180
181static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
182 unsigned int keylen)
183{
184 return -ENOSYS;
185}
186
187static 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 int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
194{
195 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
196 unsigned long alignmask = crypto_ahash_alignmask(tfm);
197 unsigned int ds = crypto_ahash_digestsize(tfm);
198 struct ahash_request_priv *priv;
199
200 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
201 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
202 GFP_KERNEL : GFP_ATOMIC);
203 if (!priv)
204 return -ENOMEM;
205
206 /*
207 * WARNING: Voodoo programming below!
208 *
209 * The code below is obscure and hard to understand, thus explanation
210 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
211 * to understand the layout of structures used here!
212 *
213 * The code here will replace portions of the ORIGINAL request with
214 * pointers to new code and buffers so the hashing operation can store
215 * the result in aligned buffer. We will call the modified request
216 * an ADJUSTED request.
217 *
218 * The newly mangled request will look as such:
219 *
220 * req {
221 * .result = ADJUSTED[new aligned buffer]
222 * .base.complete = ADJUSTED[pointer to completion function]
223 * .base.data = ADJUSTED[*req (pointer to self)]
224 * .priv = ADJUSTED[new priv] {
225 * .result = ORIGINAL(result)
226 * .complete = ORIGINAL(base.complete)
227 * .data = ORIGINAL(base.data)
228 * }
229 */
230
231 priv->result = req->result;
232 priv->complete = req->base.complete;
233 priv->data = req->base.data;
234 /*
235 * WARNING: We do not backup req->priv here! The req->priv
236 * is for internal use of the Crypto API and the
237 * user must _NOT_ _EVER_ depend on it's content!
238 */
239
240 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
241 req->base.complete = cplt;
242 req->base.data = req;
243 req->priv = priv;
244
245 return 0;
246}
247
248static void ahash_restore_req(struct ahash_request *req)
249{
250 struct ahash_request_priv *priv = req->priv;
251
252 /* Restore the original crypto request. */
253 req->result = priv->result;
254 req->base.complete = priv->complete;
255 req->base.data = priv->data;
256 req->priv = NULL;
257
258 /* Free the req->priv.priv from the ADJUSTED request. */
259 kzfree(priv);
260}
261
262static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
263{
264 struct ahash_request_priv *priv = req->priv;
265
266 if (err == -EINPROGRESS)
267 return;
268
269 if (!err)
270 memcpy(priv->result, req->result,
271 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
272
273 ahash_restore_req(req);
274}
275
276static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
277{
278 struct ahash_request *areq = req->data;
279
280 /*
281 * Restore the original request, see ahash_op_unaligned() for what
282 * goes where.
283 *
284 * The "struct ahash_request *req" here is in fact the "req.base"
285 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
286 * is a pointer to self, it is also the ADJUSTED "req" .
287 */
288
289 /* First copy req->result into req->priv.result */
290 ahash_op_unaligned_finish(areq, err);
291
292 /* Complete the ORIGINAL request. */
293 areq->base.complete(&areq->base, err);
294}
295
296static int ahash_op_unaligned(struct ahash_request *req,
297 int (*op)(struct ahash_request *))
298{
299 int err;
300
301 err = ahash_save_req(req, ahash_op_unaligned_done);
302 if (err)
303 return err;
304
305 err = op(req);
306 ahash_op_unaligned_finish(req, err);
307
308 return err;
309}
310
311static int crypto_ahash_op(struct ahash_request *req,
312 int (*op)(struct ahash_request *))
313{
314 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
315 unsigned long alignmask = crypto_ahash_alignmask(tfm);
316
317 if ((unsigned long)req->result & alignmask)
318 return ahash_op_unaligned(req, op);
319
320 return op(req);
321}
322
323int crypto_ahash_final(struct ahash_request *req)
324{
325 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
326}
327EXPORT_SYMBOL_GPL(crypto_ahash_final);
328
329int crypto_ahash_finup(struct ahash_request *req)
330{
331 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
332}
333EXPORT_SYMBOL_GPL(crypto_ahash_finup);
334
335int crypto_ahash_digest(struct ahash_request *req)
336{
337 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
338}
339EXPORT_SYMBOL_GPL(crypto_ahash_digest);
340
341static void ahash_def_finup_finish2(struct ahash_request *req, int err)
342{
343 struct ahash_request_priv *priv = req->priv;
344
345 if (err == -EINPROGRESS)
346 return;
347
348 if (!err)
349 memcpy(priv->result, req->result,
350 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
351
352 ahash_restore_req(req);
353}
354
355static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
356{
357 struct ahash_request *areq = req->data;
358
359 ahash_def_finup_finish2(areq, err);
360
361 areq->base.complete(&areq->base, err);
362}
363
364static int ahash_def_finup_finish1(struct ahash_request *req, int err)
365{
366 if (err)
367 goto out;
368
369 req->base.complete = ahash_def_finup_done2;
370 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
371 err = crypto_ahash_reqtfm(req)->final(req);
372
373out:
374 ahash_def_finup_finish2(req, err);
375 return err;
376}
377
378static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
379{
380 struct ahash_request *areq = req->data;
381
382 err = ahash_def_finup_finish1(areq, err);
383
384 areq->base.complete(&areq->base, err);
385}
386
387static int ahash_def_finup(struct ahash_request *req)
388{
389 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
390 int err;
391
392 err = ahash_save_req(req, ahash_def_finup_done1);
393 if (err)
394 return err;
395
396 err = tfm->update(req);
397 return ahash_def_finup_finish1(req, err);
398}
399
400static int ahash_no_export(struct ahash_request *req, void *out)
401{
402 return -ENOSYS;
403}
404
405static int ahash_no_import(struct ahash_request *req, const void *in)
406{
407 return -ENOSYS;
408}
409
410static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
411{
412 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
413 struct ahash_alg *alg = crypto_ahash_alg(hash);
414
415 hash->setkey = ahash_nosetkey;
416 hash->export = ahash_no_export;
417 hash->import = ahash_no_import;
418
419 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
420 return crypto_init_shash_ops_async(tfm);
421
422 hash->init = alg->init;
423 hash->update = alg->update;
424 hash->final = alg->final;
425 hash->finup = alg->finup ?: ahash_def_finup;
426 hash->digest = alg->digest;
427
428 if (alg->setkey)
429 hash->setkey = alg->setkey;
430 if (alg->export)
431 hash->export = alg->export;
432 if (alg->import)
433 hash->import = alg->import;
434
435 return 0;
436}
437
438static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
439{
440 if (alg->cra_type == &crypto_ahash_type)
441 return alg->cra_ctxsize;
442
443 return sizeof(struct crypto_shash *);
444}
445
446#ifdef CONFIG_NET
447static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
448{
449 struct crypto_report_hash rhash;
450
451 strncpy(rhash.type, "ahash", sizeof(rhash.type));
452
453 rhash.blocksize = alg->cra_blocksize;
454 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
455
456 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
457 sizeof(struct crypto_report_hash), &rhash))
458 goto nla_put_failure;
459 return 0;
460
461nla_put_failure:
462 return -EMSGSIZE;
463}
464#else
465static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
466{
467 return -ENOSYS;
468}
469#endif
470
471static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
472 __attribute__ ((unused));
473static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
474{
475 seq_printf(m, "type : ahash\n");
476 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
477 "yes" : "no");
478 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
479 seq_printf(m, "digestsize : %u\n",
480 __crypto_hash_alg_common(alg)->digestsize);
481}
482
483const struct crypto_type crypto_ahash_type = {
484 .extsize = crypto_ahash_extsize,
485 .init_tfm = crypto_ahash_init_tfm,
486#ifdef CONFIG_PROC_FS
487 .show = crypto_ahash_show,
488#endif
489 .report = crypto_ahash_report,
490 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
491 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
492 .type = CRYPTO_ALG_TYPE_AHASH,
493 .tfmsize = offsetof(struct crypto_ahash, base),
494};
495EXPORT_SYMBOL_GPL(crypto_ahash_type);
496
497struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
498 u32 mask)
499{
500 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
501}
502EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
503
504static int ahash_prepare_alg(struct ahash_alg *alg)
505{
506 struct crypto_alg *base = &alg->halg.base;
507
508 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
509 alg->halg.statesize > PAGE_SIZE / 8)
510 return -EINVAL;
511
512 base->cra_type = &crypto_ahash_type;
513 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
514 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
515
516 return 0;
517}
518
519int crypto_register_ahash(struct ahash_alg *alg)
520{
521 struct crypto_alg *base = &alg->halg.base;
522 int err;
523
524 err = ahash_prepare_alg(alg);
525 if (err)
526 return err;
527
528 return crypto_register_alg(base);
529}
530EXPORT_SYMBOL_GPL(crypto_register_ahash);
531
532int crypto_unregister_ahash(struct ahash_alg *alg)
533{
534 return crypto_unregister_alg(&alg->halg.base);
535}
536EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
537
538int ahash_register_instance(struct crypto_template *tmpl,
539 struct ahash_instance *inst)
540{
541 int err;
542
543 err = ahash_prepare_alg(&inst->alg);
544 if (err)
545 return err;
546
547 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
548}
549EXPORT_SYMBOL_GPL(ahash_register_instance);
550
551void ahash_free_instance(struct crypto_instance *inst)
552{
553 crypto_drop_spawn(crypto_instance_ctx(inst));
554 kfree(ahash_instance(inst));
555}
556EXPORT_SYMBOL_GPL(ahash_free_instance);
557
558int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
559 struct hash_alg_common *alg,
560 struct crypto_instance *inst)
561{
562 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
563 &crypto_ahash_type);
564}
565EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
566
567struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
568{
569 struct crypto_alg *alg;
570
571 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
572 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
573}
574EXPORT_SYMBOL_GPL(ahash_attr_alg);
575
576MODULE_LICENSE("GPL");
577MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
1/*
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
16#include <crypto/internal/hash.h>
17#include <crypto/scatterwalk.h>
18#include <linux/bug.h>
19#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>
25#include <linux/cryptouser.h>
26#include <linux/compiler.h>
27#include <net/netlink.h>
28
29#include "internal.h"
30
31struct ahash_request_priv {
32 crypto_completion_t complete;
33 void *data;
34 u8 *result;
35 u32 flags;
36 void *ubuf[] CRYPTO_MINALIGN_ATTR;
37};
38
39static 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
45static 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
52 if (walk->flags & CRYPTO_ALG_ASYNC)
53 walk->data = kmap(walk->pg);
54 else
55 walk->data = kmap_atomic(walk->pg);
56 walk->data += offset;
57
58 if (offset & alignmask) {
59 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
60
61 if (nbytes > unaligned)
62 nbytes = unaligned;
63 }
64
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;
74 walk->offset = sg->offset;
75 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
76 walk->offset = offset_in_page(walk->offset);
77 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) {
94 walk->offset = ALIGN(walk->offset, alignmask + 1);
95 nbytes = min(nbytes,
96 ((unsigned int)(PAGE_SIZE)) - walk->offset);
97 walk->entrylen -= nbytes;
98
99 if (nbytes) {
100 walk->data += walk->offset;
101 return nbytes;
102 }
103 }
104
105 if (walk->flags & CRYPTO_ALG_ASYNC)
106 kunmap(walk->pg);
107 else {
108 kunmap_atomic(walk->data);
109 /*
110 * The may sleep test only makes sense for sync users.
111 * Async users don't need to sleep here anyway.
112 */
113 crypto_yield(walk->flags);
114 }
115
116 if (err)
117 return err;
118
119 if (nbytes) {
120 walk->offset = 0;
121 walk->pg++;
122 return hash_walk_next(walk);
123 }
124
125 if (!walk->total)
126 return 0;
127
128 walk->sg = sg_next(walk->sg);
129
130 return hash_walk_new_entry(walk);
131}
132EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
133
134int crypto_hash_walk_first(struct ahash_request *req,
135 struct crypto_hash_walk *walk)
136{
137 walk->total = req->nbytes;
138
139 if (!walk->total) {
140 walk->entrylen = 0;
141 return 0;
142 }
143
144 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
145 walk->sg = req->src;
146 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
147
148 return hash_walk_new_entry(walk);
149}
150EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
151
152int crypto_ahash_walk_first(struct ahash_request *req,
153 struct crypto_hash_walk *walk)
154{
155 walk->total = req->nbytes;
156
157 if (!walk->total) {
158 walk->entrylen = 0;
159 return 0;
160 }
161
162 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
163 walk->sg = req->src;
164 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
165 walk->flags |= CRYPTO_ALG_ASYNC;
166
167 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
168
169 return hash_walk_new_entry(walk);
170}
171EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
172
173static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
174 unsigned int keylen)
175{
176 unsigned long alignmask = crypto_ahash_alignmask(tfm);
177 int ret;
178 u8 *buffer, *alignbuffer;
179 unsigned long absize;
180
181 absize = keylen + alignmask;
182 buffer = kmalloc(absize, GFP_KERNEL);
183 if (!buffer)
184 return -ENOMEM;
185
186 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
187 memcpy(alignbuffer, key, keylen);
188 ret = tfm->setkey(tfm, alignbuffer, keylen);
189 kzfree(buffer);
190 return ret;
191}
192
193int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
194 unsigned int keylen)
195{
196 unsigned long alignmask = crypto_ahash_alignmask(tfm);
197 int err;
198
199 if ((unsigned long)key & alignmask)
200 err = ahash_setkey_unaligned(tfm, key, keylen);
201 else
202 err = tfm->setkey(tfm, key, keylen);
203
204 if (err)
205 return err;
206
207 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
208 return 0;
209}
210EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
211
212static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
213 unsigned int keylen)
214{
215 return -ENOSYS;
216}
217
218static inline unsigned int ahash_align_buffer_size(unsigned len,
219 unsigned long mask)
220{
221 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
222}
223
224static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
225{
226 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
227 unsigned long alignmask = crypto_ahash_alignmask(tfm);
228 unsigned int ds = crypto_ahash_digestsize(tfm);
229 struct ahash_request_priv *priv;
230
231 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
232 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
233 GFP_KERNEL : GFP_ATOMIC);
234 if (!priv)
235 return -ENOMEM;
236
237 /*
238 * WARNING: Voodoo programming below!
239 *
240 * The code below is obscure and hard to understand, thus explanation
241 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
242 * to understand the layout of structures used here!
243 *
244 * The code here will replace portions of the ORIGINAL request with
245 * pointers to new code and buffers so the hashing operation can store
246 * the result in aligned buffer. We will call the modified request
247 * an ADJUSTED request.
248 *
249 * The newly mangled request will look as such:
250 *
251 * req {
252 * .result = ADJUSTED[new aligned buffer]
253 * .base.complete = ADJUSTED[pointer to completion function]
254 * .base.data = ADJUSTED[*req (pointer to self)]
255 * .priv = ADJUSTED[new priv] {
256 * .result = ORIGINAL(result)
257 * .complete = ORIGINAL(base.complete)
258 * .data = ORIGINAL(base.data)
259 * }
260 */
261
262 priv->result = req->result;
263 priv->complete = req->base.complete;
264 priv->data = req->base.data;
265 priv->flags = req->base.flags;
266
267 /*
268 * WARNING: We do not backup req->priv here! The req->priv
269 * is for internal use of the Crypto API and the
270 * user must _NOT_ _EVER_ depend on it's content!
271 */
272
273 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
274 req->base.complete = cplt;
275 req->base.data = req;
276 req->priv = priv;
277
278 return 0;
279}
280
281static void ahash_restore_req(struct ahash_request *req, int err)
282{
283 struct ahash_request_priv *priv = req->priv;
284
285 if (!err)
286 memcpy(priv->result, req->result,
287 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
288
289 /* Restore the original crypto request. */
290 req->result = priv->result;
291
292 ahash_request_set_callback(req, priv->flags,
293 priv->complete, priv->data);
294 req->priv = NULL;
295
296 /* Free the req->priv.priv from the ADJUSTED request. */
297 kzfree(priv);
298}
299
300static void ahash_notify_einprogress(struct ahash_request *req)
301{
302 struct ahash_request_priv *priv = req->priv;
303 struct crypto_async_request oreq;
304
305 oreq.data = priv->data;
306
307 priv->complete(&oreq, -EINPROGRESS);
308}
309
310static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
311{
312 struct ahash_request *areq = req->data;
313
314 if (err == -EINPROGRESS) {
315 ahash_notify_einprogress(areq);
316 return;
317 }
318
319 /*
320 * Restore the original request, see ahash_op_unaligned() for what
321 * goes where.
322 *
323 * The "struct ahash_request *req" here is in fact the "req.base"
324 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
325 * is a pointer to self, it is also the ADJUSTED "req" .
326 */
327
328 /* First copy req->result into req->priv.result */
329 ahash_restore_req(areq, err);
330
331 /* Complete the ORIGINAL request. */
332 areq->base.complete(&areq->base, err);
333}
334
335static int ahash_op_unaligned(struct ahash_request *req,
336 int (*op)(struct ahash_request *))
337{
338 int err;
339
340 err = ahash_save_req(req, ahash_op_unaligned_done);
341 if (err)
342 return err;
343
344 err = op(req);
345 if (err == -EINPROGRESS || err == -EBUSY)
346 return err;
347
348 ahash_restore_req(req, err);
349
350 return err;
351}
352
353static int crypto_ahash_op(struct ahash_request *req,
354 int (*op)(struct ahash_request *))
355{
356 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
357 unsigned long alignmask = crypto_ahash_alignmask(tfm);
358
359 if ((unsigned long)req->result & alignmask)
360 return ahash_op_unaligned(req, op);
361
362 return op(req);
363}
364
365int crypto_ahash_final(struct ahash_request *req)
366{
367 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
368}
369EXPORT_SYMBOL_GPL(crypto_ahash_final);
370
371int crypto_ahash_finup(struct ahash_request *req)
372{
373 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
374}
375EXPORT_SYMBOL_GPL(crypto_ahash_finup);
376
377int crypto_ahash_digest(struct ahash_request *req)
378{
379 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
380
381 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
382 return -ENOKEY;
383
384 return crypto_ahash_op(req, tfm->digest);
385}
386EXPORT_SYMBOL_GPL(crypto_ahash_digest);
387
388static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
389{
390 struct ahash_request *areq = req->data;
391
392 if (err == -EINPROGRESS)
393 return;
394
395 ahash_restore_req(areq, err);
396
397 areq->base.complete(&areq->base, err);
398}
399
400static int ahash_def_finup_finish1(struct ahash_request *req, int err)
401{
402 if (err)
403 goto out;
404
405 req->base.complete = ahash_def_finup_done2;
406
407 err = crypto_ahash_reqtfm(req)->final(req);
408 if (err == -EINPROGRESS || err == -EBUSY)
409 return err;
410
411out:
412 ahash_restore_req(req, err);
413 return err;
414}
415
416static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
417{
418 struct ahash_request *areq = req->data;
419
420 if (err == -EINPROGRESS) {
421 ahash_notify_einprogress(areq);
422 return;
423 }
424
425 areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
426
427 err = ahash_def_finup_finish1(areq, err);
428 if (areq->priv)
429 return;
430
431 areq->base.complete(&areq->base, err);
432}
433
434static int ahash_def_finup(struct ahash_request *req)
435{
436 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
437 int err;
438
439 err = ahash_save_req(req, ahash_def_finup_done1);
440 if (err)
441 return err;
442
443 err = tfm->update(req);
444 if (err == -EINPROGRESS || err == -EBUSY)
445 return err;
446
447 return ahash_def_finup_finish1(req, err);
448}
449
450static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
451{
452 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
453 struct ahash_alg *alg = crypto_ahash_alg(hash);
454
455 hash->setkey = ahash_nosetkey;
456
457 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
458 return crypto_init_shash_ops_async(tfm);
459
460 hash->init = alg->init;
461 hash->update = alg->update;
462 hash->final = alg->final;
463 hash->finup = alg->finup ?: ahash_def_finup;
464 hash->digest = alg->digest;
465 hash->export = alg->export;
466 hash->import = alg->import;
467
468 if (alg->setkey) {
469 hash->setkey = alg->setkey;
470 if (!(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
471 crypto_ahash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
472 }
473
474 return 0;
475}
476
477static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
478{
479 if (alg->cra_type != &crypto_ahash_type)
480 return sizeof(struct crypto_shash *);
481
482 return crypto_alg_extsize(alg);
483}
484
485#ifdef CONFIG_NET
486static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
487{
488 struct crypto_report_hash rhash;
489
490 strncpy(rhash.type, "ahash", sizeof(rhash.type));
491
492 rhash.blocksize = alg->cra_blocksize;
493 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
494
495 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
496 sizeof(struct crypto_report_hash), &rhash))
497 goto nla_put_failure;
498 return 0;
499
500nla_put_failure:
501 return -EMSGSIZE;
502}
503#else
504static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
505{
506 return -ENOSYS;
507}
508#endif
509
510static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
511 __maybe_unused;
512static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
513{
514 seq_printf(m, "type : ahash\n");
515 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
516 "yes" : "no");
517 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
518 seq_printf(m, "digestsize : %u\n",
519 __crypto_hash_alg_common(alg)->digestsize);
520}
521
522const struct crypto_type crypto_ahash_type = {
523 .extsize = crypto_ahash_extsize,
524 .init_tfm = crypto_ahash_init_tfm,
525#ifdef CONFIG_PROC_FS
526 .show = crypto_ahash_show,
527#endif
528 .report = crypto_ahash_report,
529 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
530 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
531 .type = CRYPTO_ALG_TYPE_AHASH,
532 .tfmsize = offsetof(struct crypto_ahash, base),
533};
534EXPORT_SYMBOL_GPL(crypto_ahash_type);
535
536struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
537 u32 mask)
538{
539 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
540}
541EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
542
543int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
544{
545 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
546}
547EXPORT_SYMBOL_GPL(crypto_has_ahash);
548
549static int ahash_prepare_alg(struct ahash_alg *alg)
550{
551 struct crypto_alg *base = &alg->halg.base;
552
553 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
554 alg->halg.statesize > PAGE_SIZE / 8 ||
555 alg->halg.statesize == 0)
556 return -EINVAL;
557
558 base->cra_type = &crypto_ahash_type;
559 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
560 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
561
562 return 0;
563}
564
565int crypto_register_ahash(struct ahash_alg *alg)
566{
567 struct crypto_alg *base = &alg->halg.base;
568 int err;
569
570 err = ahash_prepare_alg(alg);
571 if (err)
572 return err;
573
574 return crypto_register_alg(base);
575}
576EXPORT_SYMBOL_GPL(crypto_register_ahash);
577
578int crypto_unregister_ahash(struct ahash_alg *alg)
579{
580 return crypto_unregister_alg(&alg->halg.base);
581}
582EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
583
584int crypto_register_ahashes(struct ahash_alg *algs, int count)
585{
586 int i, ret;
587
588 for (i = 0; i < count; i++) {
589 ret = crypto_register_ahash(&algs[i]);
590 if (ret)
591 goto err;
592 }
593
594 return 0;
595
596err:
597 for (--i; i >= 0; --i)
598 crypto_unregister_ahash(&algs[i]);
599
600 return ret;
601}
602EXPORT_SYMBOL_GPL(crypto_register_ahashes);
603
604void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
605{
606 int i;
607
608 for (i = count - 1; i >= 0; --i)
609 crypto_unregister_ahash(&algs[i]);
610}
611EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
612
613int ahash_register_instance(struct crypto_template *tmpl,
614 struct ahash_instance *inst)
615{
616 int err;
617
618 err = ahash_prepare_alg(&inst->alg);
619 if (err)
620 return err;
621
622 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
623}
624EXPORT_SYMBOL_GPL(ahash_register_instance);
625
626void ahash_free_instance(struct crypto_instance *inst)
627{
628 crypto_drop_spawn(crypto_instance_ctx(inst));
629 kfree(ahash_instance(inst));
630}
631EXPORT_SYMBOL_GPL(ahash_free_instance);
632
633int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
634 struct hash_alg_common *alg,
635 struct crypto_instance *inst)
636{
637 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
638 &crypto_ahash_type);
639}
640EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
641
642struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
643{
644 struct crypto_alg *alg;
645
646 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
647 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
648}
649EXPORT_SYMBOL_GPL(ahash_attr_alg);
650
651bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
652{
653 struct crypto_alg *alg = &halg->base;
654
655 if (alg->cra_type != &crypto_ahash_type)
656 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
657
658 return __crypto_ahash_alg(alg)->setkey != NULL;
659}
660EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
661
662MODULE_LICENSE("GPL");
663MODULE_DESCRIPTION("Asynchronous cryptographic hash type");