r8152: fix tx packets accounting
[linux/fpc-iii.git] / crypto / ahash.c
blob90d73a22f12917d44504b137ea52a3e26d30dabe
1 /*
2 * Asynchronous Cryptographic Hash operations.
4 * This is the asynchronous version of hash.c with notification of
5 * completion via a callback.
7 * Copyright (c) 2008 Loc Ho <lho@amcc.com>
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.
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 <net/netlink.h>
28 #include "internal.h"
30 struct ahash_request_priv {
31 crypto_completion_t complete;
32 void *data;
33 u8 *result;
34 u32 flags;
35 void *ubuf[] CRYPTO_MINALIGN_ATTR;
38 static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
40 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
41 halg);
44 static int hash_walk_next(struct crypto_hash_walk *walk)
46 unsigned int alignmask = walk->alignmask;
47 unsigned int offset = walk->offset;
48 unsigned int nbytes = min(walk->entrylen,
49 ((unsigned int)(PAGE_SIZE)) - offset);
51 if (walk->flags & CRYPTO_ALG_ASYNC)
52 walk->data = kmap(walk->pg);
53 else
54 walk->data = kmap_atomic(walk->pg);
55 walk->data += offset;
57 if (offset & alignmask) {
58 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
60 if (nbytes > unaligned)
61 nbytes = unaligned;
64 walk->entrylen -= nbytes;
65 return nbytes;
68 static int hash_walk_new_entry(struct crypto_hash_walk *walk)
70 struct scatterlist *sg;
72 sg = walk->sg;
73 walk->offset = sg->offset;
74 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
75 walk->offset = offset_in_page(walk->offset);
76 walk->entrylen = sg->length;
78 if (walk->entrylen > walk->total)
79 walk->entrylen = walk->total;
80 walk->total -= walk->entrylen;
82 return hash_walk_next(walk);
85 int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
87 unsigned int alignmask = walk->alignmask;
88 unsigned int nbytes = walk->entrylen;
90 walk->data -= walk->offset;
92 if (nbytes && walk->offset & alignmask && !err) {
93 walk->offset = ALIGN(walk->offset, alignmask + 1);
94 nbytes = min(nbytes,
95 ((unsigned int)(PAGE_SIZE)) - walk->offset);
96 walk->entrylen -= nbytes;
98 if (nbytes) {
99 walk->data += walk->offset;
100 return nbytes;
104 if (walk->flags & CRYPTO_ALG_ASYNC)
105 kunmap(walk->pg);
106 else {
107 kunmap_atomic(walk->data);
109 * The may sleep test only makes sense for sync users.
110 * Async users don't need to sleep here anyway.
112 crypto_yield(walk->flags);
115 if (err)
116 return err;
118 if (nbytes) {
119 walk->offset = 0;
120 walk->pg++;
121 return hash_walk_next(walk);
124 if (!walk->total)
125 return 0;
127 walk->sg = sg_next(walk->sg);
129 return hash_walk_new_entry(walk);
131 EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
133 int crypto_hash_walk_first(struct ahash_request *req,
134 struct crypto_hash_walk *walk)
136 walk->total = req->nbytes;
138 if (!walk->total) {
139 walk->entrylen = 0;
140 return 0;
143 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
144 walk->sg = req->src;
145 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
147 return hash_walk_new_entry(walk);
149 EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
151 int crypto_ahash_walk_first(struct ahash_request *req,
152 struct crypto_hash_walk *walk)
154 walk->total = req->nbytes;
156 if (!walk->total) {
157 walk->entrylen = 0;
158 return 0;
161 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
162 walk->sg = req->src;
163 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
164 walk->flags |= CRYPTO_ALG_ASYNC;
166 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
168 return hash_walk_new_entry(walk);
170 EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
172 static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
173 unsigned int keylen)
175 unsigned long alignmask = crypto_ahash_alignmask(tfm);
176 int ret;
177 u8 *buffer, *alignbuffer;
178 unsigned long absize;
180 absize = keylen + alignmask;
181 buffer = kmalloc(absize, GFP_KERNEL);
182 if (!buffer)
183 return -ENOMEM;
185 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
186 memcpy(alignbuffer, key, keylen);
187 ret = tfm->setkey(tfm, alignbuffer, keylen);
188 kzfree(buffer);
189 return ret;
192 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
193 unsigned int keylen)
195 unsigned long alignmask = crypto_ahash_alignmask(tfm);
196 int err;
198 if ((unsigned long)key & alignmask)
199 err = ahash_setkey_unaligned(tfm, key, keylen);
200 else
201 err = tfm->setkey(tfm, key, keylen);
203 if (err)
204 return err;
206 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
207 return 0;
209 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
211 static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
212 unsigned int keylen)
214 return -ENOSYS;
217 static inline unsigned int ahash_align_buffer_size(unsigned len,
218 unsigned long mask)
220 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
223 static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
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;
230 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
231 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
232 GFP_KERNEL : GFP_ATOMIC);
233 if (!priv)
234 return -ENOMEM;
237 * WARNING: Voodoo programming below!
239 * The code below is obscure and hard to understand, thus explanation
240 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
241 * to understand the layout of structures used here!
243 * The code here will replace portions of the ORIGINAL request with
244 * pointers to new code and buffers so the hashing operation can store
245 * the result in aligned buffer. We will call the modified request
246 * an ADJUSTED request.
248 * The newly mangled request will look as such:
250 * req {
251 * .result = ADJUSTED[new aligned buffer]
252 * .base.complete = ADJUSTED[pointer to completion function]
253 * .base.data = ADJUSTED[*req (pointer to self)]
254 * .priv = ADJUSTED[new priv] {
255 * .result = ORIGINAL(result)
256 * .complete = ORIGINAL(base.complete)
257 * .data = ORIGINAL(base.data)
261 priv->result = req->result;
262 priv->complete = req->base.complete;
263 priv->data = req->base.data;
264 priv->flags = req->base.flags;
267 * WARNING: We do not backup req->priv here! The req->priv
268 * is for internal use of the Crypto API and the
269 * user must _NOT_ _EVER_ depend on it's content!
272 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
273 req->base.complete = cplt;
274 req->base.data = req;
275 req->priv = priv;
277 return 0;
280 static void ahash_restore_req(struct ahash_request *req, int err)
282 struct ahash_request_priv *priv = req->priv;
284 if (!err)
285 memcpy(priv->result, req->result,
286 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
288 /* Restore the original crypto request. */
289 req->result = priv->result;
291 ahash_request_set_callback(req, priv->flags,
292 priv->complete, priv->data);
293 req->priv = NULL;
295 /* Free the req->priv.priv from the ADJUSTED request. */
296 kzfree(priv);
299 static void ahash_notify_einprogress(struct ahash_request *req)
301 struct ahash_request_priv *priv = req->priv;
302 struct crypto_async_request oreq;
304 oreq.data = priv->data;
306 priv->complete(&oreq, -EINPROGRESS);
309 static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
311 struct ahash_request *areq = req->data;
313 if (err == -EINPROGRESS) {
314 ahash_notify_einprogress(areq);
315 return;
319 * Restore the original request, see ahash_op_unaligned() for what
320 * goes where.
322 * The "struct ahash_request *req" here is in fact the "req.base"
323 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
324 * is a pointer to self, it is also the ADJUSTED "req" .
327 /* First copy req->result into req->priv.result */
328 ahash_restore_req(areq, err);
330 /* Complete the ORIGINAL request. */
331 areq->base.complete(&areq->base, err);
334 static int ahash_op_unaligned(struct ahash_request *req,
335 int (*op)(struct ahash_request *))
337 int err;
339 err = ahash_save_req(req, ahash_op_unaligned_done);
340 if (err)
341 return err;
343 err = op(req);
344 if (err == -EINPROGRESS ||
345 (err == -EBUSY && (ahash_request_flags(req) &
346 CRYPTO_TFM_REQ_MAY_BACKLOG)))
347 return err;
349 ahash_restore_req(req, err);
351 return err;
354 static int crypto_ahash_op(struct ahash_request *req,
355 int (*op)(struct ahash_request *))
357 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
358 unsigned long alignmask = crypto_ahash_alignmask(tfm);
360 if ((unsigned long)req->result & alignmask)
361 return ahash_op_unaligned(req, op);
363 return op(req);
366 int crypto_ahash_final(struct ahash_request *req)
368 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
370 EXPORT_SYMBOL_GPL(crypto_ahash_final);
372 int crypto_ahash_finup(struct ahash_request *req)
374 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
376 EXPORT_SYMBOL_GPL(crypto_ahash_finup);
378 int crypto_ahash_digest(struct ahash_request *req)
380 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
382 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
383 return -ENOKEY;
385 return crypto_ahash_op(req, tfm->digest);
387 EXPORT_SYMBOL_GPL(crypto_ahash_digest);
389 static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
391 struct ahash_request *areq = req->data;
393 if (err == -EINPROGRESS)
394 return;
396 ahash_restore_req(areq, err);
398 areq->base.complete(&areq->base, err);
401 static int ahash_def_finup_finish1(struct ahash_request *req, int err)
403 if (err)
404 goto out;
406 req->base.complete = ahash_def_finup_done2;
408 err = crypto_ahash_reqtfm(req)->final(req);
409 if (err == -EINPROGRESS ||
410 (err == -EBUSY && (ahash_request_flags(req) &
411 CRYPTO_TFM_REQ_MAY_BACKLOG)))
412 return err;
414 out:
415 ahash_restore_req(req, err);
416 return err;
419 static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
421 struct ahash_request *areq = req->data;
423 if (err == -EINPROGRESS) {
424 ahash_notify_einprogress(areq);
425 return;
428 areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
430 err = ahash_def_finup_finish1(areq, err);
431 if (areq->priv)
432 return;
434 areq->base.complete(&areq->base, err);
437 static int ahash_def_finup(struct ahash_request *req)
439 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
440 int err;
442 err = ahash_save_req(req, ahash_def_finup_done1);
443 if (err)
444 return err;
446 err = tfm->update(req);
447 if (err == -EINPROGRESS ||
448 (err == -EBUSY && (ahash_request_flags(req) &
449 CRYPTO_TFM_REQ_MAY_BACKLOG)))
450 return err;
452 return ahash_def_finup_finish1(req, err);
455 static int ahash_no_export(struct ahash_request *req, void *out)
457 return -ENOSYS;
460 static int ahash_no_import(struct ahash_request *req, const void *in)
462 return -ENOSYS;
465 static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
467 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
468 struct ahash_alg *alg = crypto_ahash_alg(hash);
470 hash->setkey = ahash_nosetkey;
471 hash->export = ahash_no_export;
472 hash->import = ahash_no_import;
474 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
475 return crypto_init_shash_ops_async(tfm);
477 hash->init = alg->init;
478 hash->update = alg->update;
479 hash->final = alg->final;
480 hash->finup = alg->finup ?: ahash_def_finup;
481 hash->digest = alg->digest;
483 if (alg->setkey) {
484 hash->setkey = alg->setkey;
485 if (!(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
486 crypto_ahash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
488 if (alg->export)
489 hash->export = alg->export;
490 if (alg->import)
491 hash->import = alg->import;
493 return 0;
496 static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
498 if (alg->cra_type != &crypto_ahash_type)
499 return sizeof(struct crypto_shash *);
501 return crypto_alg_extsize(alg);
504 #ifdef CONFIG_NET
505 static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
507 struct crypto_report_hash rhash;
509 strncpy(rhash.type, "ahash", sizeof(rhash.type));
511 rhash.blocksize = alg->cra_blocksize;
512 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
514 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
515 sizeof(struct crypto_report_hash), &rhash))
516 goto nla_put_failure;
517 return 0;
519 nla_put_failure:
520 return -EMSGSIZE;
522 #else
523 static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
525 return -ENOSYS;
527 #endif
529 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
530 __attribute__ ((unused));
531 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
533 seq_printf(m, "type : ahash\n");
534 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
535 "yes" : "no");
536 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
537 seq_printf(m, "digestsize : %u\n",
538 __crypto_hash_alg_common(alg)->digestsize);
541 const struct crypto_type crypto_ahash_type = {
542 .extsize = crypto_ahash_extsize,
543 .init_tfm = crypto_ahash_init_tfm,
544 #ifdef CONFIG_PROC_FS
545 .show = crypto_ahash_show,
546 #endif
547 .report = crypto_ahash_report,
548 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
549 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
550 .type = CRYPTO_ALG_TYPE_AHASH,
551 .tfmsize = offsetof(struct crypto_ahash, base),
553 EXPORT_SYMBOL_GPL(crypto_ahash_type);
555 struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
556 u32 mask)
558 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
560 EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
562 int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
564 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
566 EXPORT_SYMBOL_GPL(crypto_has_ahash);
568 static int ahash_prepare_alg(struct ahash_alg *alg)
570 struct crypto_alg *base = &alg->halg.base;
572 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
573 alg->halg.statesize > PAGE_SIZE / 8 ||
574 alg->halg.statesize == 0)
575 return -EINVAL;
577 base->cra_type = &crypto_ahash_type;
578 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
579 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
581 return 0;
584 int crypto_register_ahash(struct ahash_alg *alg)
586 struct crypto_alg *base = &alg->halg.base;
587 int err;
589 err = ahash_prepare_alg(alg);
590 if (err)
591 return err;
593 return crypto_register_alg(base);
595 EXPORT_SYMBOL_GPL(crypto_register_ahash);
597 int crypto_unregister_ahash(struct ahash_alg *alg)
599 return crypto_unregister_alg(&alg->halg.base);
601 EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
603 int ahash_register_instance(struct crypto_template *tmpl,
604 struct ahash_instance *inst)
606 int err;
608 err = ahash_prepare_alg(&inst->alg);
609 if (err)
610 return err;
612 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
614 EXPORT_SYMBOL_GPL(ahash_register_instance);
616 void ahash_free_instance(struct crypto_instance *inst)
618 crypto_drop_spawn(crypto_instance_ctx(inst));
619 kfree(ahash_instance(inst));
621 EXPORT_SYMBOL_GPL(ahash_free_instance);
623 int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
624 struct hash_alg_common *alg,
625 struct crypto_instance *inst)
627 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
628 &crypto_ahash_type);
630 EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
632 struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
634 struct crypto_alg *alg;
636 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
637 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
639 EXPORT_SYMBOL_GPL(ahash_attr_alg);
641 bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
643 struct crypto_alg *alg = &halg->base;
645 if (alg->cra_type != &crypto_ahash_type)
646 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
648 return __crypto_ahash_alg(alg)->setkey != NULL;
650 EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
652 MODULE_LICENSE("GPL");
653 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");