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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
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");
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
21#include "internal.h"
22
23static const struct crypto_type crypto_shash_type;
24
25static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
26 unsigned int keylen)
27{
28 return -ENOSYS;
29}
30
31static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
32 unsigned int keylen)
33{
34 struct shash_alg *shash = crypto_shash_alg(tfm);
35 unsigned long alignmask = crypto_shash_alignmask(tfm);
36 unsigned long absize;
37 u8 *buffer, *alignbuffer;
38 int err;
39
40 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
41 buffer = kmalloc(absize, GFP_KERNEL);
42 if (!buffer)
43 return -ENOMEM;
44
45 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
46 memcpy(alignbuffer, key, keylen);
47 err = shash->setkey(tfm, alignbuffer, keylen);
48 kzfree(buffer);
49 return err;
50}
51
52int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
53 unsigned int keylen)
54{
55 struct shash_alg *shash = crypto_shash_alg(tfm);
56 unsigned long alignmask = crypto_shash_alignmask(tfm);
57
58 if ((unsigned long)key & alignmask)
59 return shash_setkey_unaligned(tfm, key, keylen);
60
61 return shash->setkey(tfm, key, keylen);
62}
63EXPORT_SYMBOL_GPL(crypto_shash_setkey);
64
65static inline unsigned int shash_align_buffer_size(unsigned len,
66 unsigned long mask)
67{
68 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
69}
70
71static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
72 unsigned int len)
73{
74 struct crypto_shash *tfm = desc->tfm;
75 struct shash_alg *shash = crypto_shash_alg(tfm);
76 unsigned long alignmask = crypto_shash_alignmask(tfm);
77 unsigned int unaligned_len = alignmask + 1 -
78 ((unsigned long)data & alignmask);
79 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
80 __attribute__ ((aligned));
81 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
82 int err;
83
84 if (unaligned_len > len)
85 unaligned_len = len;
86
87 memcpy(buf, data, unaligned_len);
88 err = shash->update(desc, buf, unaligned_len);
89 memset(buf, 0, unaligned_len);
90
91 return err ?:
92 shash->update(desc, data + unaligned_len, len - unaligned_len);
93}
94
95int crypto_shash_update(struct shash_desc *desc, const u8 *data,
96 unsigned int len)
97{
98 struct crypto_shash *tfm = desc->tfm;
99 struct shash_alg *shash = crypto_shash_alg(tfm);
100 unsigned long alignmask = crypto_shash_alignmask(tfm);
101
102 if ((unsigned long)data & alignmask)
103 return shash_update_unaligned(desc, data, len);
104
105 return shash->update(desc, data, len);
106}
107EXPORT_SYMBOL_GPL(crypto_shash_update);
108
109static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
110{
111 struct crypto_shash *tfm = desc->tfm;
112 unsigned long alignmask = crypto_shash_alignmask(tfm);
113 struct shash_alg *shash = crypto_shash_alg(tfm);
114 unsigned int ds = crypto_shash_digestsize(tfm);
115 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
116 __attribute__ ((aligned));
117 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
118 int err;
119
120 err = shash->final(desc, buf);
121 if (err)
122 goto out;
123
124 memcpy(out, buf, ds);
125
126out:
127 memset(buf, 0, ds);
128 return err;
129}
130
131int crypto_shash_final(struct shash_desc *desc, u8 *out)
132{
133 struct crypto_shash *tfm = desc->tfm;
134 struct shash_alg *shash = crypto_shash_alg(tfm);
135 unsigned long alignmask = crypto_shash_alignmask(tfm);
136
137 if ((unsigned long)out & alignmask)
138 return shash_final_unaligned(desc, out);
139
140 return shash->final(desc, out);
141}
142EXPORT_SYMBOL_GPL(crypto_shash_final);
143
144static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
145 unsigned int len, u8 *out)
146{
147 return crypto_shash_update(desc, data, len) ?:
148 crypto_shash_final(desc, out);
149}
150
151int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
152 unsigned int len, u8 *out)
153{
154 struct crypto_shash *tfm = desc->tfm;
155 struct shash_alg *shash = crypto_shash_alg(tfm);
156 unsigned long alignmask = crypto_shash_alignmask(tfm);
157
158 if (((unsigned long)data | (unsigned long)out) & alignmask)
159 return shash_finup_unaligned(desc, data, len, out);
160
161 return shash->finup(desc, data, len, out);
162}
163EXPORT_SYMBOL_GPL(crypto_shash_finup);
164
165static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
166 unsigned int len, u8 *out)
167{
168 return crypto_shash_init(desc) ?:
169 crypto_shash_finup(desc, data, len, out);
170}
171
172int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
173 unsigned int len, u8 *out)
174{
175 struct crypto_shash *tfm = desc->tfm;
176 struct shash_alg *shash = crypto_shash_alg(tfm);
177 unsigned long alignmask = crypto_shash_alignmask(tfm);
178
179 if (((unsigned long)data | (unsigned long)out) & alignmask)
180 return shash_digest_unaligned(desc, data, len, out);
181
182 return shash->digest(desc, data, len, out);
183}
184EXPORT_SYMBOL_GPL(crypto_shash_digest);
185
186static int shash_default_export(struct shash_desc *desc, void *out)
187{
188 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
189 return 0;
190}
191
192static int shash_default_import(struct shash_desc *desc, const void *in)
193{
194 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
195 return 0;
196}
197
198static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
199 unsigned int keylen)
200{
201 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
202
203 return crypto_shash_setkey(*ctx, key, keylen);
204}
205
206static int shash_async_init(struct ahash_request *req)
207{
208 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
209 struct shash_desc *desc = ahash_request_ctx(req);
210
211 desc->tfm = *ctx;
212 desc->flags = req->base.flags;
213
214 return crypto_shash_init(desc);
215}
216
217int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
218{
219 struct crypto_hash_walk walk;
220 int nbytes;
221
222 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
223 nbytes = crypto_hash_walk_done(&walk, nbytes))
224 nbytes = crypto_shash_update(desc, walk.data, nbytes);
225
226 return nbytes;
227}
228EXPORT_SYMBOL_GPL(shash_ahash_update);
229
230static int shash_async_update(struct ahash_request *req)
231{
232 return shash_ahash_update(req, ahash_request_ctx(req));
233}
234
235static int shash_async_final(struct ahash_request *req)
236{
237 return crypto_shash_final(ahash_request_ctx(req), req->result);
238}
239
240int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
241{
242 struct crypto_hash_walk walk;
243 int nbytes;
244
245 nbytes = crypto_hash_walk_first(req, &walk);
246 if (!nbytes)
247 return crypto_shash_final(desc, req->result);
248
249 do {
250 nbytes = crypto_hash_walk_last(&walk) ?
251 crypto_shash_finup(desc, walk.data, nbytes,
252 req->result) :
253 crypto_shash_update(desc, walk.data, nbytes);
254 nbytes = crypto_hash_walk_done(&walk, nbytes);
255 } while (nbytes > 0);
256
257 return nbytes;
258}
259EXPORT_SYMBOL_GPL(shash_ahash_finup);
260
261static int shash_async_finup(struct ahash_request *req)
262{
263 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
264 struct shash_desc *desc = ahash_request_ctx(req);
265
266 desc->tfm = *ctx;
267 desc->flags = req->base.flags;
268
269 return shash_ahash_finup(req, desc);
270}
271
272int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
273{
274 struct scatterlist *sg = req->src;
275 unsigned int offset = sg->offset;
276 unsigned int nbytes = req->nbytes;
277 int err;
278
279 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
280 void *data;
281
282 data = crypto_kmap(sg_page(sg), 0);
283 err = crypto_shash_digest(desc, data + offset, nbytes,
284 req->result);
285 crypto_kunmap(data, 0);
286 crypto_yield(desc->flags);
287 } else
288 err = crypto_shash_init(desc) ?:
289 shash_ahash_finup(req, desc);
290
291 return err;
292}
293EXPORT_SYMBOL_GPL(shash_ahash_digest);
294
295static int shash_async_digest(struct ahash_request *req)
296{
297 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
298 struct shash_desc *desc = ahash_request_ctx(req);
299
300 desc->tfm = *ctx;
301 desc->flags = req->base.flags;
302
303 return shash_ahash_digest(req, desc);
304}
305
306static int shash_async_export(struct ahash_request *req, void *out)
307{
308 return crypto_shash_export(ahash_request_ctx(req), out);
309}
310
311static int shash_async_import(struct ahash_request *req, const void *in)
312{
313 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
314 struct shash_desc *desc = ahash_request_ctx(req);
315
316 desc->tfm = *ctx;
317 desc->flags = req->base.flags;
318
319 return crypto_shash_import(desc, in);
320}
321
322static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
323{
324 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
325
326 crypto_free_shash(*ctx);
327}
328
329int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
330{
331 struct crypto_alg *calg = tfm->__crt_alg;
332 struct shash_alg *alg = __crypto_shash_alg(calg);
333 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
334 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
335 struct crypto_shash *shash;
336
337 if (!crypto_mod_get(calg))
338 return -EAGAIN;
339
340 shash = crypto_create_tfm(calg, &crypto_shash_type);
341 if (IS_ERR(shash)) {
342 crypto_mod_put(calg);
343 return PTR_ERR(shash);
344 }
345
346 *ctx = shash;
347 tfm->exit = crypto_exit_shash_ops_async;
348
349 crt->init = shash_async_init;
350 crt->update = shash_async_update;
351 crt->final = shash_async_final;
352 crt->finup = shash_async_finup;
353 crt->digest = shash_async_digest;
354
355 if (alg->setkey)
356 crt->setkey = shash_async_setkey;
357 if (alg->export)
358 crt->export = shash_async_export;
359 if (alg->import)
360 crt->import = shash_async_import;
361
362 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
363
364 return 0;
365}
366
367static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
368 unsigned int keylen)
369{
370 struct shash_desc **descp = crypto_hash_ctx(tfm);
371 struct shash_desc *desc = *descp;
372
373 return crypto_shash_setkey(desc->tfm, key, keylen);
374}
375
376static int shash_compat_init(struct hash_desc *hdesc)
377{
378 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
379 struct shash_desc *desc = *descp;
380
381 desc->flags = hdesc->flags;
382
383 return crypto_shash_init(desc);
384}
385
386static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
387 unsigned int len)
388{
389 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
390 struct shash_desc *desc = *descp;
391 struct crypto_hash_walk walk;
392 int nbytes;
393
394 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
395 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
396 nbytes = crypto_shash_update(desc, walk.data, nbytes);
397
398 return nbytes;
399}
400
401static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
402{
403 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
404
405 return crypto_shash_final(*descp, out);
406}
407
408static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
409 unsigned int nbytes, u8 *out)
410{
411 unsigned int offset = sg->offset;
412 int err;
413
414 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
415 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
416 struct shash_desc *desc = *descp;
417 void *data;
418
419 desc->flags = hdesc->flags;
420
421 data = crypto_kmap(sg_page(sg), 0);
422 err = crypto_shash_digest(desc, data + offset, nbytes, out);
423 crypto_kunmap(data, 0);
424 crypto_yield(desc->flags);
425 goto out;
426 }
427
428 err = shash_compat_init(hdesc);
429 if (err)
430 goto out;
431
432 err = shash_compat_update(hdesc, sg, nbytes);
433 if (err)
434 goto out;
435
436 err = shash_compat_final(hdesc, out);
437
438out:
439 return err;
440}
441
442static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
443{
444 struct shash_desc **descp = crypto_tfm_ctx(tfm);
445 struct shash_desc *desc = *descp;
446
447 crypto_free_shash(desc->tfm);
448 kzfree(desc);
449}
450
451static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
452{
453 struct hash_tfm *crt = &tfm->crt_hash;
454 struct crypto_alg *calg = tfm->__crt_alg;
455 struct shash_alg *alg = __crypto_shash_alg(calg);
456 struct shash_desc **descp = crypto_tfm_ctx(tfm);
457 struct crypto_shash *shash;
458 struct shash_desc *desc;
459
460 if (!crypto_mod_get(calg))
461 return -EAGAIN;
462
463 shash = crypto_create_tfm(calg, &crypto_shash_type);
464 if (IS_ERR(shash)) {
465 crypto_mod_put(calg);
466 return PTR_ERR(shash);
467 }
468
469 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
470 GFP_KERNEL);
471 if (!desc) {
472 crypto_free_shash(shash);
473 return -ENOMEM;
474 }
475
476 *descp = desc;
477 desc->tfm = shash;
478 tfm->exit = crypto_exit_shash_ops_compat;
479
480 crt->init = shash_compat_init;
481 crt->update = shash_compat_update;
482 crt->final = shash_compat_final;
483 crt->digest = shash_compat_digest;
484 crt->setkey = shash_compat_setkey;
485
486 crt->digestsize = alg->digestsize;
487
488 return 0;
489}
490
491static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
492{
493 switch (mask & CRYPTO_ALG_TYPE_MASK) {
494 case CRYPTO_ALG_TYPE_HASH_MASK:
495 return crypto_init_shash_ops_compat(tfm);
496 }
497
498 return -EINVAL;
499}
500
501static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
502 u32 mask)
503{
504 switch (mask & CRYPTO_ALG_TYPE_MASK) {
505 case CRYPTO_ALG_TYPE_HASH_MASK:
506 return sizeof(struct shash_desc *);
507 }
508
509 return 0;
510}
511
512static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
513{
514 struct crypto_shash *hash = __crypto_shash_cast(tfm);
515
516 hash->descsize = crypto_shash_alg(hash)->descsize;
517 return 0;
518}
519
520static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
521{
522 return alg->cra_ctxsize;
523}
524
525static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
526 __attribute__ ((unused));
527static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
528{
529 struct shash_alg *salg = __crypto_shash_alg(alg);
530
531 seq_printf(m, "type : shash\n");
532 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
533 seq_printf(m, "digestsize : %u\n", salg->digestsize);
534}
535
536static const struct crypto_type crypto_shash_type = {
537 .ctxsize = crypto_shash_ctxsize,
538 .extsize = crypto_shash_extsize,
539 .init = crypto_init_shash_ops,
540 .init_tfm = crypto_shash_init_tfm,
541#ifdef CONFIG_PROC_FS
542 .show = crypto_shash_show,
543#endif
544 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
545 .maskset = CRYPTO_ALG_TYPE_MASK,
546 .type = CRYPTO_ALG_TYPE_SHASH,
547 .tfmsize = offsetof(struct crypto_shash, base),
548};
549
550struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
551 u32 mask)
552{
553 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
554}
555EXPORT_SYMBOL_GPL(crypto_alloc_shash);
556
557static int shash_prepare_alg(struct shash_alg *alg)
558{
559 struct crypto_alg *base = &alg->base;
560
561 if (alg->digestsize > PAGE_SIZE / 8 ||
562 alg->descsize > PAGE_SIZE / 8 ||
563 alg->statesize > PAGE_SIZE / 8)
564 return -EINVAL;
565
566 base->cra_type = &crypto_shash_type;
567 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
568 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
569
570 if (!alg->finup)
571 alg->finup = shash_finup_unaligned;
572 if (!alg->digest)
573 alg->digest = shash_digest_unaligned;
574 if (!alg->export) {
575 alg->export = shash_default_export;
576 alg->import = shash_default_import;
577 alg->statesize = alg->descsize;
578 }
579 if (!alg->setkey)
580 alg->setkey = shash_no_setkey;
581
582 return 0;
583}
584
585int crypto_register_shash(struct shash_alg *alg)
586{
587 struct crypto_alg *base = &alg->base;
588 int err;
589
590 err = shash_prepare_alg(alg);
591 if (err)
592 return err;
593
594 return crypto_register_alg(base);
595}
596EXPORT_SYMBOL_GPL(crypto_register_shash);
597
598int crypto_unregister_shash(struct shash_alg *alg)
599{
600 return crypto_unregister_alg(&alg->base);
601}
602EXPORT_SYMBOL_GPL(crypto_unregister_shash);
603
604int shash_register_instance(struct crypto_template *tmpl,
605 struct shash_instance *inst)
606{
607 int err;
608
609 err = shash_prepare_alg(&inst->alg);
610 if (err)
611 return err;
612
613 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
614}
615EXPORT_SYMBOL_GPL(shash_register_instance);
616
617void shash_free_instance(struct crypto_instance *inst)
618{
619 crypto_drop_spawn(crypto_instance_ctx(inst));
620 kfree(shash_instance(inst));
621}
622EXPORT_SYMBOL_GPL(shash_free_instance);
623
624int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
625 struct shash_alg *alg,
626 struct crypto_instance *inst)
627{
628 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
629 &crypto_shash_type);
630}
631EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
632
633struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
634{
635 struct crypto_alg *alg;
636
637 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
638 return IS_ERR(alg) ? ERR_CAST(alg) :
639 container_of(alg, struct shash_alg, base);
640}
641EXPORT_SYMBOL_GPL(shash_attr_alg);
642
643MODULE_LICENSE("GPL");
644MODULE_DESCRIPTION("Synchronous cryptographic hash type");