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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
25#include "internal.h"
26
27struct ahash_request_priv {
28 crypto_completion_t complete;
29 void *data;
30 u8 *result;
31 void *ubuf[] CRYPTO_MINALIGN_ATTR;
32};
33
34static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
35{
36 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
37 halg);
38}
39
40static int hash_walk_next(struct crypto_hash_walk *walk)
41{
42 unsigned int alignmask = walk->alignmask;
43 unsigned int offset = walk->offset;
44 unsigned int nbytes = min(walk->entrylen,
45 ((unsigned int)(PAGE_SIZE)) - offset);
46
47 walk->data = crypto_kmap(walk->pg, 0);
48 walk->data += offset;
49
50 if (offset & alignmask)
51 nbytes = alignmask + 1 - (offset & alignmask);
52
53 walk->entrylen -= nbytes;
54 return nbytes;
55}
56
57static int hash_walk_new_entry(struct crypto_hash_walk *walk)
58{
59 struct scatterlist *sg;
60
61 sg = walk->sg;
62 walk->pg = sg_page(sg);
63 walk->offset = sg->offset;
64 walk->entrylen = sg->length;
65
66 if (walk->entrylen > walk->total)
67 walk->entrylen = walk->total;
68 walk->total -= walk->entrylen;
69
70 return hash_walk_next(walk);
71}
72
73int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
74{
75 unsigned int alignmask = walk->alignmask;
76 unsigned int nbytes = walk->entrylen;
77
78 walk->data -= walk->offset;
79
80 if (nbytes && walk->offset & alignmask && !err) {
81 walk->offset += alignmask - 1;
82 walk->offset = ALIGN(walk->offset, alignmask + 1);
83 walk->data += walk->offset;
84
85 nbytes = min(nbytes,
86 ((unsigned int)(PAGE_SIZE)) - walk->offset);
87 walk->entrylen -= nbytes;
88
89 return nbytes;
90 }
91
92 crypto_kunmap(walk->data, 0);
93 crypto_yield(walk->flags);
94
95 if (err)
96 return err;
97
98 if (nbytes) {
99 walk->offset = 0;
100 walk->pg++;
101 return hash_walk_next(walk);
102 }
103
104 if (!walk->total)
105 return 0;
106
107 walk->sg = scatterwalk_sg_next(walk->sg);
108
109 return hash_walk_new_entry(walk);
110}
111EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
112
113int crypto_hash_walk_first(struct ahash_request *req,
114 struct crypto_hash_walk *walk)
115{
116 walk->total = req->nbytes;
117
118 if (!walk->total)
119 return 0;
120
121 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
122 walk->sg = req->src;
123 walk->flags = req->base.flags;
124
125 return hash_walk_new_entry(walk);
126}
127EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
128
129int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
130 struct crypto_hash_walk *walk,
131 struct scatterlist *sg, unsigned int len)
132{
133 walk->total = len;
134
135 if (!walk->total)
136 return 0;
137
138 walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
139 walk->sg = sg;
140 walk->flags = hdesc->flags;
141
142 return hash_walk_new_entry(walk);
143}
144
145static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
146 unsigned int keylen)
147{
148 unsigned long alignmask = crypto_ahash_alignmask(tfm);
149 int ret;
150 u8 *buffer, *alignbuffer;
151 unsigned long absize;
152
153 absize = keylen + alignmask;
154 buffer = kmalloc(absize, GFP_KERNEL);
155 if (!buffer)
156 return -ENOMEM;
157
158 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
159 memcpy(alignbuffer, key, keylen);
160 ret = tfm->setkey(tfm, alignbuffer, keylen);
161 kzfree(buffer);
162 return ret;
163}
164
165int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
166 unsigned int keylen)
167{
168 unsigned long alignmask = crypto_ahash_alignmask(tfm);
169
170 if ((unsigned long)key & alignmask)
171 return ahash_setkey_unaligned(tfm, key, keylen);
172
173 return tfm->setkey(tfm, key, keylen);
174}
175EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
176
177static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
178 unsigned int keylen)
179{
180 return -ENOSYS;
181}
182
183static inline unsigned int ahash_align_buffer_size(unsigned len,
184 unsigned long mask)
185{
186 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
187}
188
189static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
190{
191 struct ahash_request_priv *priv = req->priv;
192
193 if (err == -EINPROGRESS)
194 return;
195
196 if (!err)
197 memcpy(priv->result, req->result,
198 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
199
200 kzfree(priv);
201}
202
203static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
204{
205 struct ahash_request *areq = req->data;
206 struct ahash_request_priv *priv = areq->priv;
207 crypto_completion_t complete = priv->complete;
208 void *data = priv->data;
209
210 ahash_op_unaligned_finish(areq, err);
211
212 complete(data, err);
213}
214
215static int ahash_op_unaligned(struct ahash_request *req,
216 int (*op)(struct ahash_request *))
217{
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;
222 int err;
223
224 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
225 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
226 GFP_KERNEL : GFP_ATOMIC);
227 if (!priv)
228 return -ENOMEM;
229
230 priv->result = req->result;
231 priv->complete = req->base.complete;
232 priv->data = req->base.data;
233
234 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
235 req->base.complete = ahash_op_unaligned_done;
236 req->base.data = req;
237 req->priv = priv;
238
239 err = op(req);
240 ahash_op_unaligned_finish(req, err);
241
242 return err;
243}
244
245static int crypto_ahash_op(struct ahash_request *req,
246 int (*op)(struct ahash_request *))
247{
248 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
249 unsigned long alignmask = crypto_ahash_alignmask(tfm);
250
251 if ((unsigned long)req->result & alignmask)
252 return ahash_op_unaligned(req, op);
253
254 return op(req);
255}
256
257int crypto_ahash_final(struct ahash_request *req)
258{
259 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
260}
261EXPORT_SYMBOL_GPL(crypto_ahash_final);
262
263int crypto_ahash_finup(struct ahash_request *req)
264{
265 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
266}
267EXPORT_SYMBOL_GPL(crypto_ahash_finup);
268
269int crypto_ahash_digest(struct ahash_request *req)
270{
271 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
272}
273EXPORT_SYMBOL_GPL(crypto_ahash_digest);
274
275static void ahash_def_finup_finish2(struct ahash_request *req, int err)
276{
277 struct ahash_request_priv *priv = req->priv;
278
279 if (err == -EINPROGRESS)
280 return;
281
282 if (!err)
283 memcpy(priv->result, req->result,
284 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
285
286 kzfree(priv);
287}
288
289static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
290{
291 struct ahash_request *areq = req->data;
292 struct ahash_request_priv *priv = areq->priv;
293 crypto_completion_t complete = priv->complete;
294 void *data = priv->data;
295
296 ahash_def_finup_finish2(areq, err);
297
298 complete(data, err);
299}
300
301static int ahash_def_finup_finish1(struct ahash_request *req, int err)
302{
303 if (err)
304 goto out;
305
306 req->base.complete = ahash_def_finup_done2;
307 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
308 err = crypto_ahash_reqtfm(req)->final(req);
309
310out:
311 ahash_def_finup_finish2(req, err);
312 return err;
313}
314
315static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
316{
317 struct ahash_request *areq = req->data;
318 struct ahash_request_priv *priv = areq->priv;
319 crypto_completion_t complete = priv->complete;
320 void *data = priv->data;
321
322 err = ahash_def_finup_finish1(areq, err);
323
324 complete(data, err);
325}
326
327static int ahash_def_finup(struct ahash_request *req)
328{
329 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
330 unsigned long alignmask = crypto_ahash_alignmask(tfm);
331 unsigned int ds = crypto_ahash_digestsize(tfm);
332 struct ahash_request_priv *priv;
333
334 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
335 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
336 GFP_KERNEL : GFP_ATOMIC);
337 if (!priv)
338 return -ENOMEM;
339
340 priv->result = req->result;
341 priv->complete = req->base.complete;
342 priv->data = req->base.data;
343
344 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
345 req->base.complete = ahash_def_finup_done1;
346 req->base.data = req;
347 req->priv = priv;
348
349 return ahash_def_finup_finish1(req, tfm->update(req));
350}
351
352static int ahash_no_export(struct ahash_request *req, void *out)
353{
354 return -ENOSYS;
355}
356
357static int ahash_no_import(struct ahash_request *req, const void *in)
358{
359 return -ENOSYS;
360}
361
362static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
363{
364 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
365 struct ahash_alg *alg = crypto_ahash_alg(hash);
366
367 hash->setkey = ahash_nosetkey;
368 hash->export = ahash_no_export;
369 hash->import = ahash_no_import;
370
371 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
372 return crypto_init_shash_ops_async(tfm);
373
374 hash->init = alg->init;
375 hash->update = alg->update;
376 hash->final = alg->final;
377 hash->finup = alg->finup ?: ahash_def_finup;
378 hash->digest = alg->digest;
379
380 if (alg->setkey)
381 hash->setkey = alg->setkey;
382 if (alg->export)
383 hash->export = alg->export;
384 if (alg->import)
385 hash->import = alg->import;
386
387 return 0;
388}
389
390static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
391{
392 if (alg->cra_type == &crypto_ahash_type)
393 return alg->cra_ctxsize;
394
395 return sizeof(struct crypto_shash *);
396}
397
398static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
399 __attribute__ ((unused));
400static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
401{
402 seq_printf(m, "type : ahash\n");
403 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
404 "yes" : "no");
405 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
406 seq_printf(m, "digestsize : %u\n",
407 __crypto_hash_alg_common(alg)->digestsize);
408}
409
410const struct crypto_type crypto_ahash_type = {
411 .extsize = crypto_ahash_extsize,
412 .init_tfm = crypto_ahash_init_tfm,
413#ifdef CONFIG_PROC_FS
414 .show = crypto_ahash_show,
415#endif
416 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
417 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
418 .type = CRYPTO_ALG_TYPE_AHASH,
419 .tfmsize = offsetof(struct crypto_ahash, base),
420};
421EXPORT_SYMBOL_GPL(crypto_ahash_type);
422
423struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
424 u32 mask)
425{
426 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
427}
428EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
429
430static int ahash_prepare_alg(struct ahash_alg *alg)
431{
432 struct crypto_alg *base = &alg->halg.base;
433
434 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
435 alg->halg.statesize > PAGE_SIZE / 8)
436 return -EINVAL;
437
438 base->cra_type = &crypto_ahash_type;
439 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
440 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
441
442 return 0;
443}
444
445int crypto_register_ahash(struct ahash_alg *alg)
446{
447 struct crypto_alg *base = &alg->halg.base;
448 int err;
449
450 err = ahash_prepare_alg(alg);
451 if (err)
452 return err;
453
454 return crypto_register_alg(base);
455}
456EXPORT_SYMBOL_GPL(crypto_register_ahash);
457
458int crypto_unregister_ahash(struct ahash_alg *alg)
459{
460 return crypto_unregister_alg(&alg->halg.base);
461}
462EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
463
464int ahash_register_instance(struct crypto_template *tmpl,
465 struct ahash_instance *inst)
466{
467 int err;
468
469 err = ahash_prepare_alg(&inst->alg);
470 if (err)
471 return err;
472
473 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
474}
475EXPORT_SYMBOL_GPL(ahash_register_instance);
476
477void ahash_free_instance(struct crypto_instance *inst)
478{
479 crypto_drop_spawn(crypto_instance_ctx(inst));
480 kfree(ahash_instance(inst));
481}
482EXPORT_SYMBOL_GPL(ahash_free_instance);
483
484int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
485 struct hash_alg_common *alg,
486 struct crypto_instance *inst)
487{
488 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
489 &crypto_ahash_type);
490}
491EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
492
493struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
494{
495 struct crypto_alg *alg;
496
497 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
498 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
499}
500EXPORT_SYMBOL_GPL(ahash_attr_alg);
501
502MODULE_LICENSE("GPL");
503MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
504
