nfs: move nfs_file_operations declaration to bottom of file.c (try #2)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / crypto / ahash.c
bloba3e6ef99394a9e78c7408ea4db65caa652004a1d
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/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>
27 #include "internal.h"
29 struct ahash_request_priv {
30 crypto_completion_t complete;
31 void *data;
32 u8 *result;
33 void *ubuf[] CRYPTO_MINALIGN_ATTR;
36 static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
38 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
39 halg);
42 static int hash_walk_next(struct crypto_hash_walk *walk)
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);
49 walk->data = crypto_kmap(walk->pg, 0);
50 walk->data += offset;
52 if (offset & alignmask) {
53 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
54 if (nbytes > unaligned)
55 nbytes = unaligned;
58 walk->entrylen -= nbytes;
59 return nbytes;
62 static int hash_walk_new_entry(struct crypto_hash_walk *walk)
64 struct scatterlist *sg;
66 sg = walk->sg;
67 walk->pg = sg_page(sg);
68 walk->offset = sg->offset;
69 walk->entrylen = sg->length;
71 if (walk->entrylen > walk->total)
72 walk->entrylen = walk->total;
73 walk->total -= walk->entrylen;
75 return hash_walk_next(walk);
78 int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
80 unsigned int alignmask = walk->alignmask;
81 unsigned int nbytes = walk->entrylen;
83 walk->data -= walk->offset;
85 if (nbytes && walk->offset & alignmask && !err) {
86 walk->offset = ALIGN(walk->offset, alignmask + 1);
87 walk->data += walk->offset;
89 nbytes = min(nbytes,
90 ((unsigned int)(PAGE_SIZE)) - walk->offset);
91 walk->entrylen -= nbytes;
93 return nbytes;
96 crypto_kunmap(walk->data, 0);
97 crypto_yield(walk->flags);
99 if (err)
100 return err;
102 if (nbytes) {
103 walk->offset = 0;
104 walk->pg++;
105 return hash_walk_next(walk);
108 if (!walk->total)
109 return 0;
111 walk->sg = scatterwalk_sg_next(walk->sg);
113 return hash_walk_new_entry(walk);
115 EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
117 int crypto_hash_walk_first(struct ahash_request *req,
118 struct crypto_hash_walk *walk)
120 walk->total = req->nbytes;
122 if (!walk->total)
123 return 0;
125 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
126 walk->sg = req->src;
127 walk->flags = req->base.flags;
129 return hash_walk_new_entry(walk);
131 EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
133 int crypto_hash_walk_first_compat(struct hash_desc *hdesc,
134 struct crypto_hash_walk *walk,
135 struct scatterlist *sg, unsigned int len)
137 walk->total = len;
139 if (!walk->total)
140 return 0;
142 walk->alignmask = crypto_hash_alignmask(hdesc->tfm);
143 walk->sg = sg;
144 walk->flags = hdesc->flags;
146 return hash_walk_new_entry(walk);
149 static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
150 unsigned int keylen)
152 unsigned long alignmask = crypto_ahash_alignmask(tfm);
153 int ret;
154 u8 *buffer, *alignbuffer;
155 unsigned long absize;
157 absize = keylen + alignmask;
158 buffer = kmalloc(absize, GFP_KERNEL);
159 if (!buffer)
160 return -ENOMEM;
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;
169 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
170 unsigned int keylen)
172 unsigned long alignmask = crypto_ahash_alignmask(tfm);
174 if ((unsigned long)key & alignmask)
175 return ahash_setkey_unaligned(tfm, key, keylen);
177 return tfm->setkey(tfm, key, keylen);
179 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
181 static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
182 unsigned int keylen)
184 return -ENOSYS;
187 static inline unsigned int ahash_align_buffer_size(unsigned len,
188 unsigned long mask)
190 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
193 static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
195 struct ahash_request_priv *priv = req->priv;
197 if (err == -EINPROGRESS)
198 return;
200 if (!err)
201 memcpy(priv->result, req->result,
202 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
204 kzfree(priv);
207 static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
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;
214 ahash_op_unaligned_finish(areq, err);
216 complete(data, err);
219 static int ahash_op_unaligned(struct ahash_request *req,
220 int (*op)(struct ahash_request *))
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;
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;
234 priv->result = req->result;
235 priv->complete = req->base.complete;
236 priv->data = req->base.data;
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;
243 err = op(req);
244 ahash_op_unaligned_finish(req, err);
246 return err;
249 static int crypto_ahash_op(struct ahash_request *req,
250 int (*op)(struct ahash_request *))
252 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
253 unsigned long alignmask = crypto_ahash_alignmask(tfm);
255 if ((unsigned long)req->result & alignmask)
256 return ahash_op_unaligned(req, op);
258 return op(req);
261 int crypto_ahash_final(struct ahash_request *req)
263 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
265 EXPORT_SYMBOL_GPL(crypto_ahash_final);
267 int crypto_ahash_finup(struct ahash_request *req)
269 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
271 EXPORT_SYMBOL_GPL(crypto_ahash_finup);
273 int crypto_ahash_digest(struct ahash_request *req)
275 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
277 EXPORT_SYMBOL_GPL(crypto_ahash_digest);
279 static void ahash_def_finup_finish2(struct ahash_request *req, int err)
281 struct ahash_request_priv *priv = req->priv;
283 if (err == -EINPROGRESS)
284 return;
286 if (!err)
287 memcpy(priv->result, req->result,
288 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
290 kzfree(priv);
293 static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
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;
300 ahash_def_finup_finish2(areq, err);
302 complete(data, err);
305 static int ahash_def_finup_finish1(struct ahash_request *req, int err)
307 if (err)
308 goto out;
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);
314 out:
315 ahash_def_finup_finish2(req, err);
316 return err;
319 static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
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;
326 err = ahash_def_finup_finish1(areq, err);
328 complete(data, err);
331 static int ahash_def_finup(struct ahash_request *req)
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;
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;
344 priv->result = req->result;
345 priv->complete = req->base.complete;
346 priv->data = req->base.data;
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;
353 return ahash_def_finup_finish1(req, tfm->update(req));
356 static int ahash_no_export(struct ahash_request *req, void *out)
358 return -ENOSYS;
361 static int ahash_no_import(struct ahash_request *req, const void *in)
363 return -ENOSYS;
366 static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
368 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
369 struct ahash_alg *alg = crypto_ahash_alg(hash);
371 hash->setkey = ahash_nosetkey;
372 hash->export = ahash_no_export;
373 hash->import = ahash_no_import;
375 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
376 return crypto_init_shash_ops_async(tfm);
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;
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;
391 return 0;
394 static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
396 if (alg->cra_type == &crypto_ahash_type)
397 return alg->cra_ctxsize;
399 return sizeof(struct crypto_shash *);
402 static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
404 struct crypto_report_hash rhash;
406 snprintf(rhash.type, CRYPTO_MAX_ALG_NAME, "%s", "ahash");
408 rhash.blocksize = alg->cra_blocksize;
409 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
411 NLA_PUT(skb, CRYPTOCFGA_REPORT_HASH,
412 sizeof(struct crypto_report_hash), &rhash);
414 return 0;
416 nla_put_failure:
417 return -EMSGSIZE;
420 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
421 __attribute__ ((unused));
422 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
424 seq_printf(m, "type : ahash\n");
425 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
426 "yes" : "no");
427 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
428 seq_printf(m, "digestsize : %u\n",
429 __crypto_hash_alg_common(alg)->digestsize);
432 const struct crypto_type crypto_ahash_type = {
433 .extsize = crypto_ahash_extsize,
434 .init_tfm = crypto_ahash_init_tfm,
435 #ifdef CONFIG_PROC_FS
436 .show = crypto_ahash_show,
437 #endif
438 .report = crypto_ahash_report,
439 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
440 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
441 .type = CRYPTO_ALG_TYPE_AHASH,
442 .tfmsize = offsetof(struct crypto_ahash, base),
444 EXPORT_SYMBOL_GPL(crypto_ahash_type);
446 struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
447 u32 mask)
449 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
451 EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
453 static int ahash_prepare_alg(struct ahash_alg *alg)
455 struct crypto_alg *base = &alg->halg.base;
457 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
458 alg->halg.statesize > PAGE_SIZE / 8)
459 return -EINVAL;
461 base->cra_type = &crypto_ahash_type;
462 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
463 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
465 return 0;
468 int crypto_register_ahash(struct ahash_alg *alg)
470 struct crypto_alg *base = &alg->halg.base;
471 int err;
473 err = ahash_prepare_alg(alg);
474 if (err)
475 return err;
477 return crypto_register_alg(base);
479 EXPORT_SYMBOL_GPL(crypto_register_ahash);
481 int crypto_unregister_ahash(struct ahash_alg *alg)
483 return crypto_unregister_alg(&alg->halg.base);
485 EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
487 int ahash_register_instance(struct crypto_template *tmpl,
488 struct ahash_instance *inst)
490 int err;
492 err = ahash_prepare_alg(&inst->alg);
493 if (err)
494 return err;
496 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
498 EXPORT_SYMBOL_GPL(ahash_register_instance);
500 void ahash_free_instance(struct crypto_instance *inst)
502 crypto_drop_spawn(crypto_instance_ctx(inst));
503 kfree(ahash_instance(inst));
505 EXPORT_SYMBOL_GPL(ahash_free_instance);
507 int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
508 struct hash_alg_common *alg,
509 struct crypto_instance *inst)
511 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
512 &crypto_ahash_type);
514 EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
516 struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
518 struct crypto_alg *alg;
520 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
521 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
523 EXPORT_SYMBOL_GPL(ahash_attr_alg);
525 MODULE_LICENSE("GPL");
526 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");