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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 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
216 complete(data, err);
217}
218
219static int ahash_op_unaligned(struct ahash_request *req,
220 int (*op)(struct ahash_request *))
221{
222 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
223 unsigned long alignmask = crypto_ahash_alignmask(tfm);
224 unsigned int ds = crypto_ahash_digestsize(tfm);
225 struct ahash_request_priv *priv;
226 int err;
227
228 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
229 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
230 GFP_KERNEL : GFP_ATOMIC);
231 if (!priv)
232 return -ENOMEM;
233
234 priv->result = req->result;
235 priv->complete = req->base.complete;
236 priv->data = req->base.data;
237
238 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
239 req->base.complete = ahash_op_unaligned_done;
240 req->base.data = req;
241 req->priv = priv;
242
243 err = op(req);
244 ahash_op_unaligned_finish(req, err);
245
246 return err;
247}
248
249static int crypto_ahash_op(struct ahash_request *req,
250 int (*op)(struct ahash_request *))
251{
252 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
253 unsigned long alignmask = crypto_ahash_alignmask(tfm);
254
255 if ((unsigned long)req->result & alignmask)
256 return ahash_op_unaligned(req, op);
257
258 return op(req);
259}
260
261int crypto_ahash_final(struct ahash_request *req)
262{
263 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
264}
265EXPORT_SYMBOL_GPL(crypto_ahash_final);
266
267int crypto_ahash_finup(struct ahash_request *req)
268{
269 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
270}
271EXPORT_SYMBOL_GPL(crypto_ahash_finup);
272
273int crypto_ahash_digest(struct ahash_request *req)
274{
275 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
276}
277EXPORT_SYMBOL_GPL(crypto_ahash_digest);
278
279static void ahash_def_finup_finish2(struct ahash_request *req, int err)
280{
281 struct ahash_request_priv *priv = req->priv;
282
283 if (err == -EINPROGRESS)
284 return;
285
286 if (!err)
287 memcpy(priv->result, req->result,
288 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
289
290 kzfree(priv);
291}
292
293static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
294{
295 struct ahash_request *areq = req->data;
296 struct ahash_request_priv *priv = areq->priv;
297 crypto_completion_t complete = priv->complete;
298 void *data = priv->data;
299
300 ahash_def_finup_finish2(areq, err);
301
302 complete(data, err);
303}
304
305static int ahash_def_finup_finish1(struct ahash_request *req, int err)
306{
307 if (err)
308 goto out;
309
310 req->base.complete = ahash_def_finup_done2;
311 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
312 err = crypto_ahash_reqtfm(req)->final(req);
313
314out:
315 ahash_def_finup_finish2(req, err);
316 return err;
317}
318
319static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
320{
321 struct ahash_request *areq = req->data;
322 struct ahash_request_priv *priv = areq->priv;
323 crypto_completion_t complete = priv->complete;
324 void *data = priv->data;
325
326 err = ahash_def_finup_finish1(areq, err);
327
328 complete(data, err);
329}
330
331static int ahash_def_finup(struct ahash_request *req)
332{
333 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
334 unsigned long alignmask = crypto_ahash_alignmask(tfm);
335 unsigned int ds = crypto_ahash_digestsize(tfm);
336 struct ahash_request_priv *priv;
337
338 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
339 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
340 GFP_KERNEL : GFP_ATOMIC);
341 if (!priv)
342 return -ENOMEM;
343
344 priv->result = req->result;
345 priv->complete = req->base.complete;
346 priv->data = req->base.data;
347
348 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
349 req->base.complete = ahash_def_finup_done1;
350 req->base.data = req;
351 req->priv = priv;
352
353 return ahash_def_finup_finish1(req, tfm->update(req));
354}
355
356static int ahash_no_export(struct ahash_request *req, void *out)
357{
358 return -ENOSYS;
359}
360
361static int ahash_no_import(struct ahash_request *req, const void *in)
362{
363 return -ENOSYS;
364}
365
366static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
367{
368 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
369 struct ahash_alg *alg = crypto_ahash_alg(hash);
370
371 hash->setkey = ahash_nosetkey;
372 hash->export = ahash_no_export;
373 hash->import = ahash_no_import;
374
375 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
376 return crypto_init_shash_ops_async(tfm);
377
378 hash->init = alg->init;
379 hash->update = alg->update;
380 hash->final = alg->final;
381 hash->finup = alg->finup ?: ahash_def_finup;
382 hash->digest = alg->digest;
383
384 if (alg->setkey)
385 hash->setkey = alg->setkey;
386 if (alg->export)
387 hash->export = alg->export;
388 if (alg->import)
389 hash->import = alg->import;
390
391 return 0;
392}
393
394static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
395{
396 if (alg->cra_type == &crypto_ahash_type)
397 return alg->cra_ctxsize;
398
399 return sizeof(struct crypto_shash *);
400}
401
402#ifdef CONFIG_NET
403static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
404{
405 struct crypto_report_hash rhash;
406
407 strncpy(rhash.type, "ahash", sizeof(rhash.type));
408
409 rhash.blocksize = alg->cra_blocksize;
410 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
411
412 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
413 sizeof(struct crypto_report_hash), &rhash))
414 goto nla_put_failure;
415 return 0;
416
417nla_put_failure:
418 return -EMSGSIZE;
419}
420#else
421static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
422{
423 return -ENOSYS;
424}
425#endif
426
427static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
428 __attribute__ ((unused));
429static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
430{
431 seq_printf(m, "type : ahash\n");
432 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
433 "yes" : "no");
434 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
435 seq_printf(m, "digestsize : %u\n",
436 __crypto_hash_alg_common(alg)->digestsize);
437}
438
439const struct crypto_type crypto_ahash_type = {
440 .extsize = crypto_ahash_extsize,
441 .init_tfm = crypto_ahash_init_tfm,
442#ifdef CONFIG_PROC_FS
443 .show = crypto_ahash_show,
444#endif
445 .report = crypto_ahash_report,
446 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
447 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
448 .type = CRYPTO_ALG_TYPE_AHASH,
449 .tfmsize = offsetof(struct crypto_ahash, base),
450};
451EXPORT_SYMBOL_GPL(crypto_ahash_type);
452
453struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
454 u32 mask)
455{
456 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
457}
458EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
459
460static int ahash_prepare_alg(struct ahash_alg *alg)
461{
462 struct crypto_alg *base = &alg->halg.base;
463
464 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
465 alg->halg.statesize > PAGE_SIZE / 8)
466 return -EINVAL;
467
468 base->cra_type = &crypto_ahash_type;
469 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
470 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
471
472 return 0;
473}
474
475int crypto_register_ahash(struct ahash_alg *alg)
476{
477 struct crypto_alg *base = &alg->halg.base;
478 int err;
479
480 err = ahash_prepare_alg(alg);
481 if (err)
482 return err;
483
484 return crypto_register_alg(base);
485}
486EXPORT_SYMBOL_GPL(crypto_register_ahash);
487
488int crypto_unregister_ahash(struct ahash_alg *alg)
489{
490 return crypto_unregister_alg(&alg->halg.base);
491}
492EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
493
494int ahash_register_instance(struct crypto_template *tmpl,
495 struct ahash_instance *inst)
496{
497 int err;
498
499 err = ahash_prepare_alg(&inst->alg);
500 if (err)
501 return err;
502
503 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
504}
505EXPORT_SYMBOL_GPL(ahash_register_instance);
506
507void ahash_free_instance(struct crypto_instance *inst)
508{
509 crypto_drop_spawn(crypto_instance_ctx(inst));
510 kfree(ahash_instance(inst));
511}
512EXPORT_SYMBOL_GPL(ahash_free_instance);
513
514int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
515 struct hash_alg_common *alg,
516 struct crypto_instance *inst)
517{
518 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
519 &crypto_ahash_type);
520}
521EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
522
523struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
524{
525 struct crypto_alg *alg;
526
527 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
528 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
529}
530EXPORT_SYMBOL_GPL(ahash_attr_alg);
531
532MODULE_LICENSE("GPL");
533MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
534
