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TOMOYO Linux Cross Reference
Linux/crypto/ahash.c

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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 
 29 struct ahash_request_priv {
 30         crypto_completion_t complete;
 31         void *data;
 32         u8 *result;
 33         void *ubuf[] CRYPTO_MINALIGN_ATTR;
 34 };
 35 
 36 static 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 
 42 static 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 
 62 static 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 
 78 int 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 }
115 EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
116 
117 int 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 }
131 EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
132 
133 int 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 
149 static 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 
169 int 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 }
179 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
180 
181 static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
182                           unsigned int keylen)
183 {
184         return -ENOSYS;
185 }
186 
187 static 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 
193 static 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 
207 static 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 
219 static 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 
249 static 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 
261 int crypto_ahash_final(struct ahash_request *req)
262 {
263         return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
264 }
265 EXPORT_SYMBOL_GPL(crypto_ahash_final);
266 
267 int crypto_ahash_finup(struct ahash_request *req)
268 {
269         return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
270 }
271 EXPORT_SYMBOL_GPL(crypto_ahash_finup);
272 
273 int crypto_ahash_digest(struct ahash_request *req)
274 {
275         return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
276 }
277 EXPORT_SYMBOL_GPL(crypto_ahash_digest);
278 
279 static 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 
293 static 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 
305 static 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 
314 out:
315         ahash_def_finup_finish2(req, err);
316         return err;
317 }
318 
319 static 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 
331 static 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 
356 static int ahash_no_export(struct ahash_request *req, void *out)
357 {
358         return -ENOSYS;
359 }
360 
361 static int ahash_no_import(struct ahash_request *req, const void *in)
362 {
363         return -ENOSYS;
364 }
365 
366 static 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 
394 static 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
403 static 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 
417 nla_put_failure:
418         return -EMSGSIZE;
419 }
420 #else
421 static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
422 {
423         return -ENOSYS;
424 }
425 #endif
426 
427 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
428         __attribute__ ((unused));
429 static 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 
439 const 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 };
451 EXPORT_SYMBOL_GPL(crypto_ahash_type);
452 
453 struct 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 }
458 EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
459 
460 static 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 
475 int 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 }
486 EXPORT_SYMBOL_GPL(crypto_register_ahash);
487 
488 int crypto_unregister_ahash(struct ahash_alg *alg)
489 {
490         return crypto_unregister_alg(&alg->halg.base);
491 }
492 EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
493 
494 int 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 }
505 EXPORT_SYMBOL_GPL(ahash_register_instance);
506 
507 void ahash_free_instance(struct crypto_instance *inst)
508 {
509         crypto_drop_spawn(crypto_instance_ctx(inst));
510         kfree(ahash_instance(inst));
511 }
512 EXPORT_SYMBOL_GPL(ahash_free_instance);
513 
514 int 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 }
521 EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
522 
523 struct 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 }
530 EXPORT_SYMBOL_GPL(ahash_attr_alg);
531 
532 MODULE_LICENSE("GPL");
533 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
534 

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