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1/*
2 * Synchronous Cryptographic Hash operations.
3 *
4 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/scatterwalk.h>
14#include <crypto/internal/hash.h>
15#include <linux/err.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/seq_file.h>
20#include <linux/cryptouser.h>
21#include <net/netlink.h>
22#include <linux/compiler.h>
23
24#include "internal.h"
25
26static const struct crypto_type crypto_shash_type;
27
28int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
29 unsigned int keylen)
30{
31 return -ENOSYS;
32}
33EXPORT_SYMBOL_GPL(shash_no_setkey);
34
35static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
36 unsigned int keylen)
37{
38 struct shash_alg *shash = crypto_shash_alg(tfm);
39 unsigned long alignmask = crypto_shash_alignmask(tfm);
40 unsigned long absize;
41 u8 *buffer, *alignbuffer;
42 int err;
43
44 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
45 buffer = kmalloc(absize, GFP_ATOMIC);
46 if (!buffer)
47 return -ENOMEM;
48
49 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
50 memcpy(alignbuffer, key, keylen);
51 err = shash->setkey(tfm, alignbuffer, keylen);
52 kzfree(buffer);
53 return err;
54}
55
56int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
57 unsigned int keylen)
58{
59 struct shash_alg *shash = crypto_shash_alg(tfm);
60 unsigned long alignmask = crypto_shash_alignmask(tfm);
61 int err;
62
63 if ((unsigned long)key & alignmask)
64 err = shash_setkey_unaligned(tfm, key, keylen);
65 else
66 err = shash->setkey(tfm, key, keylen);
67
68 if (err)
69 return err;
70
71 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
72 return 0;
73}
74EXPORT_SYMBOL_GPL(crypto_shash_setkey);
75
76static inline unsigned int shash_align_buffer_size(unsigned len,
77 unsigned long mask)
78{
79 typedef u8 __aligned_largest u8_aligned;
80 return len + (mask & ~(__alignof__(u8_aligned) - 1));
81}
82
83static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
84 unsigned int len)
85{
86 struct crypto_shash *tfm = desc->tfm;
87 struct shash_alg *shash = crypto_shash_alg(tfm);
88 unsigned long alignmask = crypto_shash_alignmask(tfm);
89 unsigned int unaligned_len = alignmask + 1 -
90 ((unsigned long)data & alignmask);
91 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
92 __aligned_largest;
93 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
94 int err;
95
96 if (unaligned_len > len)
97 unaligned_len = len;
98
99 memcpy(buf, data, unaligned_len);
100 err = shash->update(desc, buf, unaligned_len);
101 memset(buf, 0, unaligned_len);
102
103 return err ?:
104 shash->update(desc, data + unaligned_len, len - unaligned_len);
105}
106
107int crypto_shash_update(struct shash_desc *desc, const u8 *data,
108 unsigned int len)
109{
110 struct crypto_shash *tfm = desc->tfm;
111 struct shash_alg *shash = crypto_shash_alg(tfm);
112 unsigned long alignmask = crypto_shash_alignmask(tfm);
113
114 if ((unsigned long)data & alignmask)
115 return shash_update_unaligned(desc, data, len);
116
117 return shash->update(desc, data, len);
118}
119EXPORT_SYMBOL_GPL(crypto_shash_update);
120
121static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
122{
123 struct crypto_shash *tfm = desc->tfm;
124 unsigned long alignmask = crypto_shash_alignmask(tfm);
125 struct shash_alg *shash = crypto_shash_alg(tfm);
126 unsigned int ds = crypto_shash_digestsize(tfm);
127 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
128 __aligned_largest;
129 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
130 int err;
131
132 err = shash->final(desc, buf);
133 if (err)
134 goto out;
135
136 memcpy(out, buf, ds);
137
138out:
139 memset(buf, 0, ds);
140 return err;
141}
142
143int crypto_shash_final(struct shash_desc *desc, u8 *out)
144{
145 struct crypto_shash *tfm = desc->tfm;
146 struct shash_alg *shash = crypto_shash_alg(tfm);
147 unsigned long alignmask = crypto_shash_alignmask(tfm);
148
149 if ((unsigned long)out & alignmask)
150 return shash_final_unaligned(desc, out);
151
152 return shash->final(desc, out);
153}
154EXPORT_SYMBOL_GPL(crypto_shash_final);
155
156static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
157 unsigned int len, u8 *out)
158{
159 return crypto_shash_update(desc, data, len) ?:
160 crypto_shash_final(desc, out);
161}
162
163int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
164 unsigned int len, u8 *out)
165{
166 struct crypto_shash *tfm = desc->tfm;
167 struct shash_alg *shash = crypto_shash_alg(tfm);
168 unsigned long alignmask = crypto_shash_alignmask(tfm);
169
170 if (((unsigned long)data | (unsigned long)out) & alignmask)
171 return shash_finup_unaligned(desc, data, len, out);
172
173 return shash->finup(desc, data, len, out);
174}
175EXPORT_SYMBOL_GPL(crypto_shash_finup);
176
177static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
178 unsigned int len, u8 *out)
179{
180 return crypto_shash_init(desc) ?:
181 crypto_shash_finup(desc, data, len, out);
182}
183
184int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
185 unsigned int len, u8 *out)
186{
187 struct crypto_shash *tfm = desc->tfm;
188 struct shash_alg *shash = crypto_shash_alg(tfm);
189 unsigned long alignmask = crypto_shash_alignmask(tfm);
190
191 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
192 return -ENOKEY;
193
194 if (((unsigned long)data | (unsigned long)out) & alignmask)
195 return shash_digest_unaligned(desc, data, len, out);
196
197 return shash->digest(desc, data, len, out);
198}
199EXPORT_SYMBOL_GPL(crypto_shash_digest);
200
201static int shash_default_export(struct shash_desc *desc, void *out)
202{
203 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
204 return 0;
205}
206
207static int shash_default_import(struct shash_desc *desc, const void *in)
208{
209 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
210 return 0;
211}
212
213static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
214 unsigned int keylen)
215{
216 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
217
218 return crypto_shash_setkey(*ctx, key, keylen);
219}
220
221static int shash_async_init(struct ahash_request *req)
222{
223 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
224 struct shash_desc *desc = ahash_request_ctx(req);
225
226 desc->tfm = *ctx;
227 desc->flags = req->base.flags;
228
229 return crypto_shash_init(desc);
230}
231
232int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
233{
234 struct crypto_hash_walk walk;
235 int nbytes;
236
237 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
238 nbytes = crypto_hash_walk_done(&walk, nbytes))
239 nbytes = crypto_shash_update(desc, walk.data, nbytes);
240
241 return nbytes;
242}
243EXPORT_SYMBOL_GPL(shash_ahash_update);
244
245static int shash_async_update(struct ahash_request *req)
246{
247 return shash_ahash_update(req, ahash_request_ctx(req));
248}
249
250static int shash_async_final(struct ahash_request *req)
251{
252 return crypto_shash_final(ahash_request_ctx(req), req->result);
253}
254
255int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
256{
257 struct crypto_hash_walk walk;
258 int nbytes;
259
260 nbytes = crypto_hash_walk_first(req, &walk);
261 if (!nbytes)
262 return crypto_shash_final(desc, req->result);
263
264 do {
265 nbytes = crypto_hash_walk_last(&walk) ?
266 crypto_shash_finup(desc, walk.data, nbytes,
267 req->result) :
268 crypto_shash_update(desc, walk.data, nbytes);
269 nbytes = crypto_hash_walk_done(&walk, nbytes);
270 } while (nbytes > 0);
271
272 return nbytes;
273}
274EXPORT_SYMBOL_GPL(shash_ahash_finup);
275
276static int shash_async_finup(struct ahash_request *req)
277{
278 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
279 struct shash_desc *desc = ahash_request_ctx(req);
280
281 desc->tfm = *ctx;
282 desc->flags = req->base.flags;
283
284 return shash_ahash_finup(req, desc);
285}
286
287int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
288{
289 unsigned int nbytes = req->nbytes;
290 struct scatterlist *sg;
291 unsigned int offset;
292 int err;
293
294 if (nbytes &&
295 (sg = req->src, offset = sg->offset,
296 nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
297 void *data;
298
299 data = kmap_atomic(sg_page(sg));
300 err = crypto_shash_digest(desc, data + offset, nbytes,
301 req->result);
302 kunmap_atomic(data);
303 crypto_yield(desc->flags);
304 } else
305 err = crypto_shash_init(desc) ?:
306 shash_ahash_finup(req, desc);
307
308 return err;
309}
310EXPORT_SYMBOL_GPL(shash_ahash_digest);
311
312static int shash_async_digest(struct ahash_request *req)
313{
314 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
315 struct shash_desc *desc = ahash_request_ctx(req);
316
317 desc->tfm = *ctx;
318 desc->flags = req->base.flags;
319
320 return shash_ahash_digest(req, desc);
321}
322
323static int shash_async_export(struct ahash_request *req, void *out)
324{
325 return crypto_shash_export(ahash_request_ctx(req), out);
326}
327
328static int shash_async_import(struct ahash_request *req, const void *in)
329{
330 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
331 struct shash_desc *desc = ahash_request_ctx(req);
332
333 desc->tfm = *ctx;
334 desc->flags = req->base.flags;
335
336 return crypto_shash_import(desc, in);
337}
338
339static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
340{
341 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
342
343 crypto_free_shash(*ctx);
344}
345
346int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
347{
348 struct crypto_alg *calg = tfm->__crt_alg;
349 struct shash_alg *alg = __crypto_shash_alg(calg);
350 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
351 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
352 struct crypto_shash *shash;
353
354 if (!crypto_mod_get(calg))
355 return -EAGAIN;
356
357 shash = crypto_create_tfm(calg, &crypto_shash_type);
358 if (IS_ERR(shash)) {
359 crypto_mod_put(calg);
360 return PTR_ERR(shash);
361 }
362
363 *ctx = shash;
364 tfm->exit = crypto_exit_shash_ops_async;
365
366 crt->init = shash_async_init;
367 crt->update = shash_async_update;
368 crt->final = shash_async_final;
369 crt->finup = shash_async_finup;
370 crt->digest = shash_async_digest;
371 crt->setkey = shash_async_setkey;
372
373 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
374 CRYPTO_TFM_NEED_KEY);
375
376 if (alg->export)
377 crt->export = shash_async_export;
378 if (alg->import)
379 crt->import = shash_async_import;
380
381 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
382
383 return 0;
384}
385
386static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
387{
388 struct crypto_shash *hash = __crypto_shash_cast(tfm);
389 struct shash_alg *alg = crypto_shash_alg(hash);
390
391 hash->descsize = alg->descsize;
392
393 if (crypto_shash_alg_has_setkey(alg) &&
394 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
395 crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
396
397 return 0;
398}
399
400#ifdef CONFIG_NET
401static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
402{
403 struct crypto_report_hash rhash;
404 struct shash_alg *salg = __crypto_shash_alg(alg);
405
406 strncpy(rhash.type, "shash", sizeof(rhash.type));
407
408 rhash.blocksize = alg->cra_blocksize;
409 rhash.digestsize = salg->digestsize;
410
411 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
412 sizeof(struct crypto_report_hash), &rhash))
413 goto nla_put_failure;
414 return 0;
415
416nla_put_failure:
417 return -EMSGSIZE;
418}
419#else
420static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
421{
422 return -ENOSYS;
423}
424#endif
425
426static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
427 __maybe_unused;
428static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
429{
430 struct shash_alg *salg = __crypto_shash_alg(alg);
431
432 seq_printf(m, "type : shash\n");
433 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
434 seq_printf(m, "digestsize : %u\n", salg->digestsize);
435}
436
437static const struct crypto_type crypto_shash_type = {
438 .extsize = crypto_alg_extsize,
439 .init_tfm = crypto_shash_init_tfm,
440#ifdef CONFIG_PROC_FS
441 .show = crypto_shash_show,
442#endif
443 .report = crypto_shash_report,
444 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
445 .maskset = CRYPTO_ALG_TYPE_MASK,
446 .type = CRYPTO_ALG_TYPE_SHASH,
447 .tfmsize = offsetof(struct crypto_shash, base),
448};
449
450struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
451 u32 mask)
452{
453 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
454}
455EXPORT_SYMBOL_GPL(crypto_alloc_shash);
456
457static int shash_prepare_alg(struct shash_alg *alg)
458{
459 struct crypto_alg *base = &alg->base;
460
461 if (alg->digestsize > PAGE_SIZE / 8 ||
462 alg->descsize > PAGE_SIZE / 8 ||
463 alg->statesize > PAGE_SIZE / 8)
464 return -EINVAL;
465
466 base->cra_type = &crypto_shash_type;
467 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
468 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
469
470 if (!alg->finup)
471 alg->finup = shash_finup_unaligned;
472 if (!alg->digest)
473 alg->digest = shash_digest_unaligned;
474 if (!alg->export) {
475 alg->export = shash_default_export;
476 alg->import = shash_default_import;
477 alg->statesize = alg->descsize;
478 }
479 if (!alg->setkey)
480 alg->setkey = shash_no_setkey;
481
482 return 0;
483}
484
485int crypto_register_shash(struct shash_alg *alg)
486{
487 struct crypto_alg *base = &alg->base;
488 int err;
489
490 err = shash_prepare_alg(alg);
491 if (err)
492 return err;
493
494 return crypto_register_alg(base);
495}
496EXPORT_SYMBOL_GPL(crypto_register_shash);
497
498int crypto_unregister_shash(struct shash_alg *alg)
499{
500 return crypto_unregister_alg(&alg->base);
501}
502EXPORT_SYMBOL_GPL(crypto_unregister_shash);
503
504int crypto_register_shashes(struct shash_alg *algs, int count)
505{
506 int i, ret;
507
508 for (i = 0; i < count; i++) {
509 ret = crypto_register_shash(&algs[i]);
510 if (ret)
511 goto err;
512 }
513
514 return 0;
515
516err:
517 for (--i; i >= 0; --i)
518 crypto_unregister_shash(&algs[i]);
519
520 return ret;
521}
522EXPORT_SYMBOL_GPL(crypto_register_shashes);
523
524int crypto_unregister_shashes(struct shash_alg *algs, int count)
525{
526 int i, ret;
527
528 for (i = count - 1; i >= 0; --i) {
529 ret = crypto_unregister_shash(&algs[i]);
530 if (ret)
531 pr_err("Failed to unregister %s %s: %d\n",
532 algs[i].base.cra_driver_name,
533 algs[i].base.cra_name, ret);
534 }
535
536 return 0;
537}
538EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
539
540int shash_register_instance(struct crypto_template *tmpl,
541 struct shash_instance *inst)
542{
543 int err;
544
545 err = shash_prepare_alg(&inst->alg);
546 if (err)
547 return err;
548
549 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
550}
551EXPORT_SYMBOL_GPL(shash_register_instance);
552
553void shash_free_instance(struct crypto_instance *inst)
554{
555 crypto_drop_spawn(crypto_instance_ctx(inst));
556 kfree(shash_instance(inst));
557}
558EXPORT_SYMBOL_GPL(shash_free_instance);
559
560int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
561 struct shash_alg *alg,
562 struct crypto_instance *inst)
563{
564 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
565 &crypto_shash_type);
566}
567EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
568
569struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
570{
571 struct crypto_alg *alg;
572
573 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
574 return IS_ERR(alg) ? ERR_CAST(alg) :
575 container_of(alg, struct shash_alg, base);
576}
577EXPORT_SYMBOL_GPL(shash_attr_alg);
578
579MODULE_LICENSE("GPL");
580MODULE_DESCRIPTION("Synchronous cryptographic hash type");
1/*
2 * Synchronous Cryptographic Hash operations.
3 *
4 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/scatterwalk.h>
14#include <crypto/internal/hash.h>
15#include <linux/err.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/seq_file.h>
20#include <linux/cryptouser.h>
21#include <net/netlink.h>
22
23#include "internal.h"
24
25static const struct crypto_type crypto_shash_type;
26
27static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
28 unsigned int keylen)
29{
30 return -ENOSYS;
31}
32
33static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
34 unsigned int keylen)
35{
36 struct shash_alg *shash = crypto_shash_alg(tfm);
37 unsigned long alignmask = crypto_shash_alignmask(tfm);
38 unsigned long absize;
39 u8 *buffer, *alignbuffer;
40 int err;
41
42 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
43 buffer = kmalloc(absize, GFP_KERNEL);
44 if (!buffer)
45 return -ENOMEM;
46
47 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
48 memcpy(alignbuffer, key, keylen);
49 err = shash->setkey(tfm, alignbuffer, keylen);
50 kzfree(buffer);
51 return err;
52}
53
54int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
55 unsigned int keylen)
56{
57 struct shash_alg *shash = crypto_shash_alg(tfm);
58 unsigned long alignmask = crypto_shash_alignmask(tfm);
59
60 if ((unsigned long)key & alignmask)
61 return shash_setkey_unaligned(tfm, key, keylen);
62
63 return shash->setkey(tfm, key, keylen);
64}
65EXPORT_SYMBOL_GPL(crypto_shash_setkey);
66
67static inline unsigned int shash_align_buffer_size(unsigned len,
68 unsigned long mask)
69{
70 typedef u8 __attribute__ ((aligned)) u8_aligned;
71 return len + (mask & ~(__alignof__(u8_aligned) - 1));
72}
73
74static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
75 unsigned int len)
76{
77 struct crypto_shash *tfm = desc->tfm;
78 struct shash_alg *shash = crypto_shash_alg(tfm);
79 unsigned long alignmask = crypto_shash_alignmask(tfm);
80 unsigned int unaligned_len = alignmask + 1 -
81 ((unsigned long)data & alignmask);
82 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
83 __attribute__ ((aligned));
84 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
85 int err;
86
87 if (unaligned_len > len)
88 unaligned_len = len;
89
90 memcpy(buf, data, unaligned_len);
91 err = shash->update(desc, buf, unaligned_len);
92 memset(buf, 0, unaligned_len);
93
94 return err ?:
95 shash->update(desc, data + unaligned_len, len - unaligned_len);
96}
97
98int crypto_shash_update(struct shash_desc *desc, const u8 *data,
99 unsigned int len)
100{
101 struct crypto_shash *tfm = desc->tfm;
102 struct shash_alg *shash = crypto_shash_alg(tfm);
103 unsigned long alignmask = crypto_shash_alignmask(tfm);
104
105 if ((unsigned long)data & alignmask)
106 return shash_update_unaligned(desc, data, len);
107
108 return shash->update(desc, data, len);
109}
110EXPORT_SYMBOL_GPL(crypto_shash_update);
111
112static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
113{
114 struct crypto_shash *tfm = desc->tfm;
115 unsigned long alignmask = crypto_shash_alignmask(tfm);
116 struct shash_alg *shash = crypto_shash_alg(tfm);
117 unsigned int ds = crypto_shash_digestsize(tfm);
118 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
119 __attribute__ ((aligned));
120 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
121 int err;
122
123 err = shash->final(desc, buf);
124 if (err)
125 goto out;
126
127 memcpy(out, buf, ds);
128
129out:
130 memset(buf, 0, ds);
131 return err;
132}
133
134int crypto_shash_final(struct shash_desc *desc, u8 *out)
135{
136 struct crypto_shash *tfm = desc->tfm;
137 struct shash_alg *shash = crypto_shash_alg(tfm);
138 unsigned long alignmask = crypto_shash_alignmask(tfm);
139
140 if ((unsigned long)out & alignmask)
141 return shash_final_unaligned(desc, out);
142
143 return shash->final(desc, out);
144}
145EXPORT_SYMBOL_GPL(crypto_shash_final);
146
147static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
148 unsigned int len, u8 *out)
149{
150 return crypto_shash_update(desc, data, len) ?:
151 crypto_shash_final(desc, out);
152}
153
154int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
155 unsigned int len, u8 *out)
156{
157 struct crypto_shash *tfm = desc->tfm;
158 struct shash_alg *shash = crypto_shash_alg(tfm);
159 unsigned long alignmask = crypto_shash_alignmask(tfm);
160
161 if (((unsigned long)data | (unsigned long)out) & alignmask)
162 return shash_finup_unaligned(desc, data, len, out);
163
164 return shash->finup(desc, data, len, out);
165}
166EXPORT_SYMBOL_GPL(crypto_shash_finup);
167
168static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
169 unsigned int len, u8 *out)
170{
171 return crypto_shash_init(desc) ?:
172 crypto_shash_finup(desc, data, len, out);
173}
174
175int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
176 unsigned int len, u8 *out)
177{
178 struct crypto_shash *tfm = desc->tfm;
179 struct shash_alg *shash = crypto_shash_alg(tfm);
180 unsigned long alignmask = crypto_shash_alignmask(tfm);
181
182 if (((unsigned long)data | (unsigned long)out) & alignmask)
183 return shash_digest_unaligned(desc, data, len, out);
184
185 return shash->digest(desc, data, len, out);
186}
187EXPORT_SYMBOL_GPL(crypto_shash_digest);
188
189static int shash_default_export(struct shash_desc *desc, void *out)
190{
191 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
192 return 0;
193}
194
195static int shash_default_import(struct shash_desc *desc, const void *in)
196{
197 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
198 return 0;
199}
200
201static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
202 unsigned int keylen)
203{
204 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
205
206 return crypto_shash_setkey(*ctx, key, keylen);
207}
208
209static int shash_async_init(struct ahash_request *req)
210{
211 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
212 struct shash_desc *desc = ahash_request_ctx(req);
213
214 desc->tfm = *ctx;
215 desc->flags = req->base.flags;
216
217 return crypto_shash_init(desc);
218}
219
220int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
221{
222 struct crypto_hash_walk walk;
223 int nbytes;
224
225 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
226 nbytes = crypto_hash_walk_done(&walk, nbytes))
227 nbytes = crypto_shash_update(desc, walk.data, nbytes);
228
229 return nbytes;
230}
231EXPORT_SYMBOL_GPL(shash_ahash_update);
232
233static int shash_async_update(struct ahash_request *req)
234{
235 return shash_ahash_update(req, ahash_request_ctx(req));
236}
237
238static int shash_async_final(struct ahash_request *req)
239{
240 return crypto_shash_final(ahash_request_ctx(req), req->result);
241}
242
243int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
244{
245 struct crypto_hash_walk walk;
246 int nbytes;
247
248 nbytes = crypto_hash_walk_first(req, &walk);
249 if (!nbytes)
250 return crypto_shash_final(desc, req->result);
251
252 do {
253 nbytes = crypto_hash_walk_last(&walk) ?
254 crypto_shash_finup(desc, walk.data, nbytes,
255 req->result) :
256 crypto_shash_update(desc, walk.data, nbytes);
257 nbytes = crypto_hash_walk_done(&walk, nbytes);
258 } while (nbytes > 0);
259
260 return nbytes;
261}
262EXPORT_SYMBOL_GPL(shash_ahash_finup);
263
264static int shash_async_finup(struct ahash_request *req)
265{
266 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
267 struct shash_desc *desc = ahash_request_ctx(req);
268
269 desc->tfm = *ctx;
270 desc->flags = req->base.flags;
271
272 return shash_ahash_finup(req, desc);
273}
274
275int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
276{
277 struct scatterlist *sg = req->src;
278 unsigned int offset = sg->offset;
279 unsigned int nbytes = req->nbytes;
280 int err;
281
282 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
283 void *data;
284
285 data = kmap_atomic(sg_page(sg));
286 err = crypto_shash_digest(desc, data + offset, nbytes,
287 req->result);
288 kunmap_atomic(data);
289 crypto_yield(desc->flags);
290 } else
291 err = crypto_shash_init(desc) ?:
292 shash_ahash_finup(req, desc);
293
294 return err;
295}
296EXPORT_SYMBOL_GPL(shash_ahash_digest);
297
298static int shash_async_digest(struct ahash_request *req)
299{
300 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
301 struct shash_desc *desc = ahash_request_ctx(req);
302
303 desc->tfm = *ctx;
304 desc->flags = req->base.flags;
305
306 return shash_ahash_digest(req, desc);
307}
308
309static int shash_async_export(struct ahash_request *req, void *out)
310{
311 return crypto_shash_export(ahash_request_ctx(req), out);
312}
313
314static int shash_async_import(struct ahash_request *req, const void *in)
315{
316 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
317 struct shash_desc *desc = ahash_request_ctx(req);
318
319 desc->tfm = *ctx;
320 desc->flags = req->base.flags;
321
322 return crypto_shash_import(desc, in);
323}
324
325static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
326{
327 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
328
329 crypto_free_shash(*ctx);
330}
331
332int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
333{
334 struct crypto_alg *calg = tfm->__crt_alg;
335 struct shash_alg *alg = __crypto_shash_alg(calg);
336 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
337 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
338 struct crypto_shash *shash;
339
340 if (!crypto_mod_get(calg))
341 return -EAGAIN;
342
343 shash = crypto_create_tfm(calg, &crypto_shash_type);
344 if (IS_ERR(shash)) {
345 crypto_mod_put(calg);
346 return PTR_ERR(shash);
347 }
348
349 *ctx = shash;
350 tfm->exit = crypto_exit_shash_ops_async;
351
352 crt->init = shash_async_init;
353 crt->update = shash_async_update;
354 crt->final = shash_async_final;
355 crt->finup = shash_async_finup;
356 crt->digest = shash_async_digest;
357 crt->setkey = shash_async_setkey;
358
359 crt->has_setkey = alg->setkey != shash_no_setkey;
360
361 if (alg->export)
362 crt->export = shash_async_export;
363 if (alg->import)
364 crt->import = shash_async_import;
365
366 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
367
368 return 0;
369}
370
371static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
372{
373 struct crypto_shash *hash = __crypto_shash_cast(tfm);
374
375 hash->descsize = crypto_shash_alg(hash)->descsize;
376 return 0;
377}
378
379#ifdef CONFIG_NET
380static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
381{
382 struct crypto_report_hash rhash;
383 struct shash_alg *salg = __crypto_shash_alg(alg);
384
385 strncpy(rhash.type, "shash", sizeof(rhash.type));
386
387 rhash.blocksize = alg->cra_blocksize;
388 rhash.digestsize = salg->digestsize;
389
390 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
391 sizeof(struct crypto_report_hash), &rhash))
392 goto nla_put_failure;
393 return 0;
394
395nla_put_failure:
396 return -EMSGSIZE;
397}
398#else
399static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
400{
401 return -ENOSYS;
402}
403#endif
404
405static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
406 __attribute__ ((unused));
407static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
408{
409 struct shash_alg *salg = __crypto_shash_alg(alg);
410
411 seq_printf(m, "type : shash\n");
412 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
413 seq_printf(m, "digestsize : %u\n", salg->digestsize);
414}
415
416static const struct crypto_type crypto_shash_type = {
417 .extsize = crypto_alg_extsize,
418 .init_tfm = crypto_shash_init_tfm,
419#ifdef CONFIG_PROC_FS
420 .show = crypto_shash_show,
421#endif
422 .report = crypto_shash_report,
423 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
424 .maskset = CRYPTO_ALG_TYPE_MASK,
425 .type = CRYPTO_ALG_TYPE_SHASH,
426 .tfmsize = offsetof(struct crypto_shash, base),
427};
428
429struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
430 u32 mask)
431{
432 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
433}
434EXPORT_SYMBOL_GPL(crypto_alloc_shash);
435
436static int shash_prepare_alg(struct shash_alg *alg)
437{
438 struct crypto_alg *base = &alg->base;
439
440 if (alg->digestsize > PAGE_SIZE / 8 ||
441 alg->descsize > PAGE_SIZE / 8 ||
442 alg->statesize > PAGE_SIZE / 8)
443 return -EINVAL;
444
445 base->cra_type = &crypto_shash_type;
446 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
447 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
448
449 if (!alg->finup)
450 alg->finup = shash_finup_unaligned;
451 if (!alg->digest)
452 alg->digest = shash_digest_unaligned;
453 if (!alg->export) {
454 alg->export = shash_default_export;
455 alg->import = shash_default_import;
456 alg->statesize = alg->descsize;
457 }
458 if (!alg->setkey)
459 alg->setkey = shash_no_setkey;
460
461 return 0;
462}
463
464int crypto_register_shash(struct shash_alg *alg)
465{
466 struct crypto_alg *base = &alg->base;
467 int err;
468
469 err = shash_prepare_alg(alg);
470 if (err)
471 return err;
472
473 return crypto_register_alg(base);
474}
475EXPORT_SYMBOL_GPL(crypto_register_shash);
476
477int crypto_unregister_shash(struct shash_alg *alg)
478{
479 return crypto_unregister_alg(&alg->base);
480}
481EXPORT_SYMBOL_GPL(crypto_unregister_shash);
482
483int crypto_register_shashes(struct shash_alg *algs, int count)
484{
485 int i, ret;
486
487 for (i = 0; i < count; i++) {
488 ret = crypto_register_shash(&algs[i]);
489 if (ret)
490 goto err;
491 }
492
493 return 0;
494
495err:
496 for (--i; i >= 0; --i)
497 crypto_unregister_shash(&algs[i]);
498
499 return ret;
500}
501EXPORT_SYMBOL_GPL(crypto_register_shashes);
502
503int crypto_unregister_shashes(struct shash_alg *algs, int count)
504{
505 int i, ret;
506
507 for (i = count - 1; i >= 0; --i) {
508 ret = crypto_unregister_shash(&algs[i]);
509 if (ret)
510 pr_err("Failed to unregister %s %s: %d\n",
511 algs[i].base.cra_driver_name,
512 algs[i].base.cra_name, ret);
513 }
514
515 return 0;
516}
517EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
518
519int shash_register_instance(struct crypto_template *tmpl,
520 struct shash_instance *inst)
521{
522 int err;
523
524 err = shash_prepare_alg(&inst->alg);
525 if (err)
526 return err;
527
528 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
529}
530EXPORT_SYMBOL_GPL(shash_register_instance);
531
532void shash_free_instance(struct crypto_instance *inst)
533{
534 crypto_drop_spawn(crypto_instance_ctx(inst));
535 kfree(shash_instance(inst));
536}
537EXPORT_SYMBOL_GPL(shash_free_instance);
538
539int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
540 struct shash_alg *alg,
541 struct crypto_instance *inst)
542{
543 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
544 &crypto_shash_type);
545}
546EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
547
548struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
549{
550 struct crypto_alg *alg;
551
552 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
553 return IS_ERR(alg) ? ERR_CAST(alg) :
554 container_of(alg, struct shash_alg, base);
555}
556EXPORT_SYMBOL_GPL(shash_attr_alg);
557
558MODULE_LICENSE("GPL");
559MODULE_DESCRIPTION("Synchronous cryptographic hash type");