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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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Synchronous Cryptographic Hash operations.
4 *
5 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/scatterwalk.h>
9#include <crypto/internal/hash.h>
10#include <linux/err.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/seq_file.h>
15#include <linux/cryptouser.h>
16#include <net/netlink.h>
17#include <linux/compiler.h>
18
19#include "internal.h"
20
21static const struct crypto_type crypto_shash_type;
22
23static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
24 unsigned int keylen)
25{
26 return -ENOSYS;
27}
28
29/*
30 * Check whether an shash algorithm has a setkey function.
31 *
32 * For CFI compatibility, this must not be an inline function. This is because
33 * when CFI is enabled, modules won't get the same address for shash_no_setkey
34 * (if it were exported, which inlining would require) as the core kernel will.
35 */
36bool crypto_shash_alg_has_setkey(struct shash_alg *alg)
37{
38 return alg->setkey != shash_no_setkey;
39}
40EXPORT_SYMBOL_GPL(crypto_shash_alg_has_setkey);
41
42static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
43 unsigned int keylen)
44{
45 struct shash_alg *shash = crypto_shash_alg(tfm);
46 unsigned long alignmask = crypto_shash_alignmask(tfm);
47 unsigned long absize;
48 u8 *buffer, *alignbuffer;
49 int err;
50
51 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
52 buffer = kmalloc(absize, GFP_ATOMIC);
53 if (!buffer)
54 return -ENOMEM;
55
56 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
57 memcpy(alignbuffer, key, keylen);
58 err = shash->setkey(tfm, alignbuffer, keylen);
59 kfree_sensitive(buffer);
60 return err;
61}
62
63static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
64{
65 if (crypto_shash_alg_needs_key(alg))
66 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
67}
68
69int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
70 unsigned int keylen)
71{
72 struct shash_alg *shash = crypto_shash_alg(tfm);
73 unsigned long alignmask = crypto_shash_alignmask(tfm);
74 int err;
75
76 if ((unsigned long)key & alignmask)
77 err = shash_setkey_unaligned(tfm, key, keylen);
78 else
79 err = shash->setkey(tfm, key, keylen);
80
81 if (unlikely(err)) {
82 shash_set_needkey(tfm, shash);
83 return err;
84 }
85
86 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
87 return 0;
88}
89EXPORT_SYMBOL_GPL(crypto_shash_setkey);
90
91static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
92 unsigned int len)
93{
94 struct crypto_shash *tfm = desc->tfm;
95 struct shash_alg *shash = crypto_shash_alg(tfm);
96 unsigned long alignmask = crypto_shash_alignmask(tfm);
97 unsigned int unaligned_len = alignmask + 1 -
98 ((unsigned long)data & alignmask);
99 /*
100 * We cannot count on __aligned() working for large values:
101 * https://patchwork.kernel.org/patch/9507697/
102 */
103 u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
104 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
105 int err;
106
107 if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
108 return -EINVAL;
109
110 if (unaligned_len > len)
111 unaligned_len = len;
112
113 memcpy(buf, data, unaligned_len);
114 err = shash->update(desc, buf, unaligned_len);
115 memset(buf, 0, unaligned_len);
116
117 return err ?:
118 shash->update(desc, data + unaligned_len, len - unaligned_len);
119}
120
121int crypto_shash_update(struct shash_desc *desc, const u8 *data,
122 unsigned int len)
123{
124 struct crypto_shash *tfm = desc->tfm;
125 struct shash_alg *shash = crypto_shash_alg(tfm);
126 unsigned long alignmask = crypto_shash_alignmask(tfm);
127
128 if ((unsigned long)data & alignmask)
129 return shash_update_unaligned(desc, data, len);
130
131 return shash->update(desc, data, len);
132}
133EXPORT_SYMBOL_GPL(crypto_shash_update);
134
135static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
136{
137 struct crypto_shash *tfm = desc->tfm;
138 unsigned long alignmask = crypto_shash_alignmask(tfm);
139 struct shash_alg *shash = crypto_shash_alg(tfm);
140 unsigned int ds = crypto_shash_digestsize(tfm);
141 /*
142 * We cannot count on __aligned() working for large values:
143 * https://patchwork.kernel.org/patch/9507697/
144 */
145 u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
146 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
147 int err;
148
149 if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
150 return -EINVAL;
151
152 err = shash->final(desc, buf);
153 if (err)
154 goto out;
155
156 memcpy(out, buf, ds);
157
158out:
159 memset(buf, 0, ds);
160 return err;
161}
162
163int crypto_shash_final(struct shash_desc *desc, u8 *out)
164{
165 struct crypto_shash *tfm = desc->tfm;
166 struct shash_alg *shash = crypto_shash_alg(tfm);
167 unsigned long alignmask = crypto_shash_alignmask(tfm);
168
169 if ((unsigned long)out & alignmask)
170 return shash_final_unaligned(desc, out);
171
172 return shash->final(desc, out);
173}
174EXPORT_SYMBOL_GPL(crypto_shash_final);
175
176static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
177 unsigned int len, u8 *out)
178{
179 return crypto_shash_update(desc, data, len) ?:
180 crypto_shash_final(desc, out);
181}
182
183int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
184 unsigned int len, u8 *out)
185{
186 struct crypto_shash *tfm = desc->tfm;
187 struct shash_alg *shash = crypto_shash_alg(tfm);
188 unsigned long alignmask = crypto_shash_alignmask(tfm);
189
190 if (((unsigned long)data | (unsigned long)out) & alignmask)
191 return shash_finup_unaligned(desc, data, len, out);
192
193 return shash->finup(desc, data, len, out);
194}
195EXPORT_SYMBOL_GPL(crypto_shash_finup);
196
197static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
198 unsigned int len, u8 *out)
199{
200 return crypto_shash_init(desc) ?:
201 crypto_shash_finup(desc, data, len, out);
202}
203
204int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
205 unsigned int len, u8 *out)
206{
207 struct crypto_shash *tfm = desc->tfm;
208 struct shash_alg *shash = crypto_shash_alg(tfm);
209 unsigned long alignmask = crypto_shash_alignmask(tfm);
210
211 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
212 return -ENOKEY;
213
214 if (((unsigned long)data | (unsigned long)out) & alignmask)
215 return shash_digest_unaligned(desc, data, len, out);
216
217 return shash->digest(desc, data, len, out);
218}
219EXPORT_SYMBOL_GPL(crypto_shash_digest);
220
221int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
222 unsigned int len, u8 *out)
223{
224 SHASH_DESC_ON_STACK(desc, tfm);
225 int err;
226
227 desc->tfm = tfm;
228
229 err = crypto_shash_digest(desc, data, len, out);
230
231 shash_desc_zero(desc);
232
233 return err;
234}
235EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
236
237static int shash_default_export(struct shash_desc *desc, void *out)
238{
239 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
240 return 0;
241}
242
243static int shash_default_import(struct shash_desc *desc, const void *in)
244{
245 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
246 return 0;
247}
248
249static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
250 unsigned int keylen)
251{
252 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
253
254 return crypto_shash_setkey(*ctx, key, keylen);
255}
256
257static int shash_async_init(struct ahash_request *req)
258{
259 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
260 struct shash_desc *desc = ahash_request_ctx(req);
261
262 desc->tfm = *ctx;
263
264 return crypto_shash_init(desc);
265}
266
267int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
268{
269 struct crypto_hash_walk walk;
270 int nbytes;
271
272 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
273 nbytes = crypto_hash_walk_done(&walk, nbytes))
274 nbytes = crypto_shash_update(desc, walk.data, nbytes);
275
276 return nbytes;
277}
278EXPORT_SYMBOL_GPL(shash_ahash_update);
279
280static int shash_async_update(struct ahash_request *req)
281{
282 return shash_ahash_update(req, ahash_request_ctx(req));
283}
284
285static int shash_async_final(struct ahash_request *req)
286{
287 return crypto_shash_final(ahash_request_ctx(req), req->result);
288}
289
290int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
291{
292 struct crypto_hash_walk walk;
293 int nbytes;
294
295 nbytes = crypto_hash_walk_first(req, &walk);
296 if (!nbytes)
297 return crypto_shash_final(desc, req->result);
298
299 do {
300 nbytes = crypto_hash_walk_last(&walk) ?
301 crypto_shash_finup(desc, walk.data, nbytes,
302 req->result) :
303 crypto_shash_update(desc, walk.data, nbytes);
304 nbytes = crypto_hash_walk_done(&walk, nbytes);
305 } while (nbytes > 0);
306
307 return nbytes;
308}
309EXPORT_SYMBOL_GPL(shash_ahash_finup);
310
311static int shash_async_finup(struct ahash_request *req)
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
318 return shash_ahash_finup(req, desc);
319}
320
321int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
322{
323 unsigned int nbytes = req->nbytes;
324 struct scatterlist *sg;
325 unsigned int offset;
326 int err;
327
328 if (nbytes &&
329 (sg = req->src, offset = sg->offset,
330 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
331 void *data;
332
333 data = kmap_atomic(sg_page(sg));
334 err = crypto_shash_digest(desc, data + offset, nbytes,
335 req->result);
336 kunmap_atomic(data);
337 } else
338 err = crypto_shash_init(desc) ?:
339 shash_ahash_finup(req, desc);
340
341 return err;
342}
343EXPORT_SYMBOL_GPL(shash_ahash_digest);
344
345static int shash_async_digest(struct ahash_request *req)
346{
347 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
348 struct shash_desc *desc = ahash_request_ctx(req);
349
350 desc->tfm = *ctx;
351
352 return shash_ahash_digest(req, desc);
353}
354
355static int shash_async_export(struct ahash_request *req, void *out)
356{
357 return crypto_shash_export(ahash_request_ctx(req), out);
358}
359
360static int shash_async_import(struct ahash_request *req, const void *in)
361{
362 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
363 struct shash_desc *desc = ahash_request_ctx(req);
364
365 desc->tfm = *ctx;
366
367 return crypto_shash_import(desc, in);
368}
369
370static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
371{
372 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
373
374 crypto_free_shash(*ctx);
375}
376
377int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
378{
379 struct crypto_alg *calg = tfm->__crt_alg;
380 struct shash_alg *alg = __crypto_shash_alg(calg);
381 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
382 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
383 struct crypto_shash *shash;
384
385 if (!crypto_mod_get(calg))
386 return -EAGAIN;
387
388 shash = crypto_create_tfm(calg, &crypto_shash_type);
389 if (IS_ERR(shash)) {
390 crypto_mod_put(calg);
391 return PTR_ERR(shash);
392 }
393
394 *ctx = shash;
395 tfm->exit = crypto_exit_shash_ops_async;
396
397 crt->init = shash_async_init;
398 crt->update = shash_async_update;
399 crt->final = shash_async_final;
400 crt->finup = shash_async_finup;
401 crt->digest = shash_async_digest;
402 if (crypto_shash_alg_has_setkey(alg))
403 crt->setkey = shash_async_setkey;
404
405 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
406 CRYPTO_TFM_NEED_KEY);
407
408 crt->export = shash_async_export;
409 crt->import = shash_async_import;
410
411 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
412
413 return 0;
414}
415
416static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
417{
418 struct crypto_shash *hash = __crypto_shash_cast(tfm);
419 struct shash_alg *alg = crypto_shash_alg(hash);
420
421 alg->exit_tfm(hash);
422}
423
424static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
425{
426 struct crypto_shash *hash = __crypto_shash_cast(tfm);
427 struct shash_alg *alg = crypto_shash_alg(hash);
428 int err;
429
430 hash->descsize = alg->descsize;
431
432 shash_set_needkey(hash, alg);
433
434 if (alg->exit_tfm)
435 tfm->exit = crypto_shash_exit_tfm;
436
437 if (!alg->init_tfm)
438 return 0;
439
440 err = alg->init_tfm(hash);
441 if (err)
442 return err;
443
444 /* ->init_tfm() may have increased the descsize. */
445 if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
446 if (alg->exit_tfm)
447 alg->exit_tfm(hash);
448 return -EINVAL;
449 }
450
451 return 0;
452}
453
454static void crypto_shash_free_instance(struct crypto_instance *inst)
455{
456 struct shash_instance *shash = shash_instance(inst);
457
458 shash->free(shash);
459}
460
461#ifdef CONFIG_NET
462static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
463{
464 struct crypto_report_hash rhash;
465 struct shash_alg *salg = __crypto_shash_alg(alg);
466
467 memset(&rhash, 0, sizeof(rhash));
468
469 strscpy(rhash.type, "shash", sizeof(rhash.type));
470
471 rhash.blocksize = alg->cra_blocksize;
472 rhash.digestsize = salg->digestsize;
473
474 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
475}
476#else
477static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
478{
479 return -ENOSYS;
480}
481#endif
482
483static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
484 __maybe_unused;
485static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
486{
487 struct shash_alg *salg = __crypto_shash_alg(alg);
488
489 seq_printf(m, "type : shash\n");
490 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
491 seq_printf(m, "digestsize : %u\n", salg->digestsize);
492}
493
494static const struct crypto_type crypto_shash_type = {
495 .extsize = crypto_alg_extsize,
496 .init_tfm = crypto_shash_init_tfm,
497 .free = crypto_shash_free_instance,
498#ifdef CONFIG_PROC_FS
499 .show = crypto_shash_show,
500#endif
501 .report = crypto_shash_report,
502 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
503 .maskset = CRYPTO_ALG_TYPE_MASK,
504 .type = CRYPTO_ALG_TYPE_SHASH,
505 .tfmsize = offsetof(struct crypto_shash, base),
506};
507
508int crypto_grab_shash(struct crypto_shash_spawn *spawn,
509 struct crypto_instance *inst,
510 const char *name, u32 type, u32 mask)
511{
512 spawn->base.frontend = &crypto_shash_type;
513 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
514}
515EXPORT_SYMBOL_GPL(crypto_grab_shash);
516
517struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
518 u32 mask)
519{
520 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
521}
522EXPORT_SYMBOL_GPL(crypto_alloc_shash);
523
524static int shash_prepare_alg(struct shash_alg *alg)
525{
526 struct crypto_alg *base = &alg->base;
527
528 if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
529 alg->descsize > HASH_MAX_DESCSIZE ||
530 alg->statesize > HASH_MAX_STATESIZE)
531 return -EINVAL;
532
533 if ((alg->export && !alg->import) || (alg->import && !alg->export))
534 return -EINVAL;
535
536 base->cra_type = &crypto_shash_type;
537 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
538 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
539
540 if (!alg->finup)
541 alg->finup = shash_finup_unaligned;
542 if (!alg->digest)
543 alg->digest = shash_digest_unaligned;
544 if (!alg->export) {
545 alg->export = shash_default_export;
546 alg->import = shash_default_import;
547 alg->statesize = alg->descsize;
548 }
549 if (!alg->setkey)
550 alg->setkey = shash_no_setkey;
551
552 return 0;
553}
554
555int crypto_register_shash(struct shash_alg *alg)
556{
557 struct crypto_alg *base = &alg->base;
558 int err;
559
560 err = shash_prepare_alg(alg);
561 if (err)
562 return err;
563
564 return crypto_register_alg(base);
565}
566EXPORT_SYMBOL_GPL(crypto_register_shash);
567
568void crypto_unregister_shash(struct shash_alg *alg)
569{
570 crypto_unregister_alg(&alg->base);
571}
572EXPORT_SYMBOL_GPL(crypto_unregister_shash);
573
574int crypto_register_shashes(struct shash_alg *algs, int count)
575{
576 int i, ret;
577
578 for (i = 0; i < count; i++) {
579 ret = crypto_register_shash(&algs[i]);
580 if (ret)
581 goto err;
582 }
583
584 return 0;
585
586err:
587 for (--i; i >= 0; --i)
588 crypto_unregister_shash(&algs[i]);
589
590 return ret;
591}
592EXPORT_SYMBOL_GPL(crypto_register_shashes);
593
594void crypto_unregister_shashes(struct shash_alg *algs, int count)
595{
596 int i;
597
598 for (i = count - 1; i >= 0; --i)
599 crypto_unregister_shash(&algs[i]);
600}
601EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
602
603int shash_register_instance(struct crypto_template *tmpl,
604 struct shash_instance *inst)
605{
606 int err;
607
608 if (WARN_ON(!inst->free))
609 return -EINVAL;
610
611 err = shash_prepare_alg(&inst->alg);
612 if (err)
613 return err;
614
615 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
616}
617EXPORT_SYMBOL_GPL(shash_register_instance);
618
619void shash_free_singlespawn_instance(struct shash_instance *inst)
620{
621 crypto_drop_spawn(shash_instance_ctx(inst));
622 kfree(inst);
623}
624EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
625
626MODULE_LICENSE("GPL");
627MODULE_DESCRIPTION("Synchronous cryptographic hash type");