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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 <linux/cryptouser.h>
10#include <linux/err.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/seq_file.h>
14#include <linux/string.h>
15#include <net/netlink.h>
16
17#include "hash.h"
18
19static inline struct crypto_istat_hash *shash_get_stat(struct shash_alg *alg)
20{
21 return hash_get_stat(&alg->halg);
22}
23
24static inline int crypto_shash_errstat(struct shash_alg *alg, int err)
25{
26 if (IS_ENABLED(CONFIG_CRYPTO_STATS) && err)
27 atomic64_inc(&shash_get_stat(alg)->err_cnt);
28 return err;
29}
30
31int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
32 unsigned int keylen)
33{
34 return -ENOSYS;
35}
36EXPORT_SYMBOL_GPL(shash_no_setkey);
37
38static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
39{
40 if (crypto_shash_alg_needs_key(alg))
41 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
42}
43
44int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
45 unsigned int keylen)
46{
47 struct shash_alg *shash = crypto_shash_alg(tfm);
48 int err;
49
50 err = shash->setkey(tfm, key, keylen);
51 if (unlikely(err)) {
52 shash_set_needkey(tfm, shash);
53 return err;
54 }
55
56 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
57 return 0;
58}
59EXPORT_SYMBOL_GPL(crypto_shash_setkey);
60
61int crypto_shash_update(struct shash_desc *desc, const u8 *data,
62 unsigned int len)
63{
64 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
65 int err;
66
67 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
68 atomic64_add(len, &shash_get_stat(shash)->hash_tlen);
69
70 err = shash->update(desc, data, len);
71
72 return crypto_shash_errstat(shash, err);
73}
74EXPORT_SYMBOL_GPL(crypto_shash_update);
75
76int crypto_shash_final(struct shash_desc *desc, u8 *out)
77{
78 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
79 int err;
80
81 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
82 atomic64_inc(&shash_get_stat(shash)->hash_cnt);
83
84 err = shash->final(desc, out);
85
86 return crypto_shash_errstat(shash, err);
87}
88EXPORT_SYMBOL_GPL(crypto_shash_final);
89
90static int shash_default_finup(struct shash_desc *desc, const u8 *data,
91 unsigned int len, u8 *out)
92{
93 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
94
95 return shash->update(desc, data, len) ?:
96 shash->final(desc, out);
97}
98
99int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
100 unsigned int len, u8 *out)
101{
102 struct crypto_shash *tfm = desc->tfm;
103 struct shash_alg *shash = crypto_shash_alg(tfm);
104 int err;
105
106 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
107 struct crypto_istat_hash *istat = shash_get_stat(shash);
108
109 atomic64_inc(&istat->hash_cnt);
110 atomic64_add(len, &istat->hash_tlen);
111 }
112
113 err = shash->finup(desc, data, len, out);
114
115 return crypto_shash_errstat(shash, err);
116}
117EXPORT_SYMBOL_GPL(crypto_shash_finup);
118
119static int shash_default_digest(struct shash_desc *desc, const u8 *data,
120 unsigned int len, u8 *out)
121{
122 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
123
124 return shash->init(desc) ?:
125 shash->finup(desc, data, len, out);
126}
127
128int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
129 unsigned int len, u8 *out)
130{
131 struct crypto_shash *tfm = desc->tfm;
132 struct shash_alg *shash = crypto_shash_alg(tfm);
133 int err;
134
135 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
136 struct crypto_istat_hash *istat = shash_get_stat(shash);
137
138 atomic64_inc(&istat->hash_cnt);
139 atomic64_add(len, &istat->hash_tlen);
140 }
141
142 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
143 err = -ENOKEY;
144 else
145 err = shash->digest(desc, data, len, out);
146
147 return crypto_shash_errstat(shash, err);
148}
149EXPORT_SYMBOL_GPL(crypto_shash_digest);
150
151int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
152 unsigned int len, u8 *out)
153{
154 SHASH_DESC_ON_STACK(desc, tfm);
155 int err;
156
157 desc->tfm = tfm;
158
159 err = crypto_shash_digest(desc, data, len, out);
160
161 shash_desc_zero(desc);
162
163 return err;
164}
165EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
166
167int crypto_shash_export(struct shash_desc *desc, void *out)
168{
169 struct crypto_shash *tfm = desc->tfm;
170 struct shash_alg *shash = crypto_shash_alg(tfm);
171
172 if (shash->export)
173 return shash->export(desc, out);
174
175 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
176 return 0;
177}
178EXPORT_SYMBOL_GPL(crypto_shash_export);
179
180int crypto_shash_import(struct shash_desc *desc, const void *in)
181{
182 struct crypto_shash *tfm = desc->tfm;
183 struct shash_alg *shash = crypto_shash_alg(tfm);
184
185 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
186 return -ENOKEY;
187
188 if (shash->import)
189 return shash->import(desc, in);
190
191 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
192 return 0;
193}
194EXPORT_SYMBOL_GPL(crypto_shash_import);
195
196static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
197{
198 struct crypto_shash *hash = __crypto_shash_cast(tfm);
199 struct shash_alg *alg = crypto_shash_alg(hash);
200
201 alg->exit_tfm(hash);
202}
203
204static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
205{
206 struct crypto_shash *hash = __crypto_shash_cast(tfm);
207 struct shash_alg *alg = crypto_shash_alg(hash);
208 int err;
209
210 hash->descsize = alg->descsize;
211
212 shash_set_needkey(hash, alg);
213
214 if (alg->exit_tfm)
215 tfm->exit = crypto_shash_exit_tfm;
216
217 if (!alg->init_tfm)
218 return 0;
219
220 err = alg->init_tfm(hash);
221 if (err)
222 return err;
223
224 /* ->init_tfm() may have increased the descsize. */
225 if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
226 if (alg->exit_tfm)
227 alg->exit_tfm(hash);
228 return -EINVAL;
229 }
230
231 return 0;
232}
233
234static void crypto_shash_free_instance(struct crypto_instance *inst)
235{
236 struct shash_instance *shash = shash_instance(inst);
237
238 shash->free(shash);
239}
240
241static int __maybe_unused crypto_shash_report(
242 struct sk_buff *skb, struct crypto_alg *alg)
243{
244 struct crypto_report_hash rhash;
245 struct shash_alg *salg = __crypto_shash_alg(alg);
246
247 memset(&rhash, 0, sizeof(rhash));
248
249 strscpy(rhash.type, "shash", sizeof(rhash.type));
250
251 rhash.blocksize = alg->cra_blocksize;
252 rhash.digestsize = salg->digestsize;
253
254 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
255}
256
257static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
258 __maybe_unused;
259static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
260{
261 struct shash_alg *salg = __crypto_shash_alg(alg);
262
263 seq_printf(m, "type : shash\n");
264 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
265 seq_printf(m, "digestsize : %u\n", salg->digestsize);
266}
267
268static int __maybe_unused crypto_shash_report_stat(
269 struct sk_buff *skb, struct crypto_alg *alg)
270{
271 return crypto_hash_report_stat(skb, alg, "shash");
272}
273
274const struct crypto_type crypto_shash_type = {
275 .extsize = crypto_alg_extsize,
276 .init_tfm = crypto_shash_init_tfm,
277 .free = crypto_shash_free_instance,
278#ifdef CONFIG_PROC_FS
279 .show = crypto_shash_show,
280#endif
281#if IS_ENABLED(CONFIG_CRYPTO_USER)
282 .report = crypto_shash_report,
283#endif
284#ifdef CONFIG_CRYPTO_STATS
285 .report_stat = crypto_shash_report_stat,
286#endif
287 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
288 .maskset = CRYPTO_ALG_TYPE_MASK,
289 .type = CRYPTO_ALG_TYPE_SHASH,
290 .tfmsize = offsetof(struct crypto_shash, base),
291};
292
293int crypto_grab_shash(struct crypto_shash_spawn *spawn,
294 struct crypto_instance *inst,
295 const char *name, u32 type, u32 mask)
296{
297 spawn->base.frontend = &crypto_shash_type;
298 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
299}
300EXPORT_SYMBOL_GPL(crypto_grab_shash);
301
302struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
303 u32 mask)
304{
305 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
306}
307EXPORT_SYMBOL_GPL(crypto_alloc_shash);
308
309int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
310{
311 return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
312}
313EXPORT_SYMBOL_GPL(crypto_has_shash);
314
315struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
316{
317 struct crypto_tfm *tfm = crypto_shash_tfm(hash);
318 struct shash_alg *alg = crypto_shash_alg(hash);
319 struct crypto_shash *nhash;
320 int err;
321
322 if (!crypto_shash_alg_has_setkey(alg)) {
323 tfm = crypto_tfm_get(tfm);
324 if (IS_ERR(tfm))
325 return ERR_CAST(tfm);
326
327 return hash;
328 }
329
330 if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init))
331 return ERR_PTR(-ENOSYS);
332
333 nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
334 if (IS_ERR(nhash))
335 return nhash;
336
337 nhash->descsize = hash->descsize;
338
339 if (alg->clone_tfm) {
340 err = alg->clone_tfm(nhash, hash);
341 if (err) {
342 crypto_free_shash(nhash);
343 return ERR_PTR(err);
344 }
345 }
346
347 return nhash;
348}
349EXPORT_SYMBOL_GPL(crypto_clone_shash);
350
351int hash_prepare_alg(struct hash_alg_common *alg)
352{
353 struct crypto_istat_hash *istat = hash_get_stat(alg);
354 struct crypto_alg *base = &alg->base;
355
356 if (alg->digestsize > HASH_MAX_DIGESTSIZE)
357 return -EINVAL;
358
359 /* alignmask is not useful for hashes, so it is not supported. */
360 if (base->cra_alignmask)
361 return -EINVAL;
362
363 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
364
365 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
366 memset(istat, 0, sizeof(*istat));
367
368 return 0;
369}
370
371static int shash_prepare_alg(struct shash_alg *alg)
372{
373 struct crypto_alg *base = &alg->halg.base;
374 int err;
375
376 if (alg->descsize > HASH_MAX_DESCSIZE)
377 return -EINVAL;
378
379 if ((alg->export && !alg->import) || (alg->import && !alg->export))
380 return -EINVAL;
381
382 err = hash_prepare_alg(&alg->halg);
383 if (err)
384 return err;
385
386 base->cra_type = &crypto_shash_type;
387 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
388
389 /*
390 * Handle missing optional functions. For each one we can either
391 * install a default here, or we can leave the pointer as NULL and check
392 * the pointer for NULL in crypto_shash_*(), avoiding an indirect call
393 * when the default behavior is desired. For ->finup and ->digest we
394 * install defaults, since for optimal performance algorithms should
395 * implement these anyway. On the other hand, for ->import and
396 * ->export the common case and best performance comes from the simple
397 * memcpy of the shash_desc_ctx, so when those pointers are NULL we
398 * leave them NULL and provide the memcpy with no indirect call.
399 */
400 if (!alg->finup)
401 alg->finup = shash_default_finup;
402 if (!alg->digest)
403 alg->digest = shash_default_digest;
404 if (!alg->export)
405 alg->halg.statesize = alg->descsize;
406 if (!alg->setkey)
407 alg->setkey = shash_no_setkey;
408
409 return 0;
410}
411
412int crypto_register_shash(struct shash_alg *alg)
413{
414 struct crypto_alg *base = &alg->base;
415 int err;
416
417 err = shash_prepare_alg(alg);
418 if (err)
419 return err;
420
421 return crypto_register_alg(base);
422}
423EXPORT_SYMBOL_GPL(crypto_register_shash);
424
425void crypto_unregister_shash(struct shash_alg *alg)
426{
427 crypto_unregister_alg(&alg->base);
428}
429EXPORT_SYMBOL_GPL(crypto_unregister_shash);
430
431int crypto_register_shashes(struct shash_alg *algs, int count)
432{
433 int i, ret;
434
435 for (i = 0; i < count; i++) {
436 ret = crypto_register_shash(&algs[i]);
437 if (ret)
438 goto err;
439 }
440
441 return 0;
442
443err:
444 for (--i; i >= 0; --i)
445 crypto_unregister_shash(&algs[i]);
446
447 return ret;
448}
449EXPORT_SYMBOL_GPL(crypto_register_shashes);
450
451void crypto_unregister_shashes(struct shash_alg *algs, int count)
452{
453 int i;
454
455 for (i = count - 1; i >= 0; --i)
456 crypto_unregister_shash(&algs[i]);
457}
458EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
459
460int shash_register_instance(struct crypto_template *tmpl,
461 struct shash_instance *inst)
462{
463 int err;
464
465 if (WARN_ON(!inst->free))
466 return -EINVAL;
467
468 err = shash_prepare_alg(&inst->alg);
469 if (err)
470 return err;
471
472 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
473}
474EXPORT_SYMBOL_GPL(shash_register_instance);
475
476void shash_free_singlespawn_instance(struct shash_instance *inst)
477{
478 crypto_drop_spawn(shash_instance_ctx(inst));
479 kfree(inst);
480}
481EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
482
483MODULE_LICENSE("GPL");
484MODULE_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");