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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 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
71}
72
73static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
74 unsigned int len)
75{
76 struct crypto_shash *tfm = desc->tfm;
77 struct shash_alg *shash = crypto_shash_alg(tfm);
78 unsigned long alignmask = crypto_shash_alignmask(tfm);
79 unsigned int unaligned_len = alignmask + 1 -
80 ((unsigned long)data & alignmask);
81 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
82 __attribute__ ((aligned));
83 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
84 int err;
85
86 if (unaligned_len > len)
87 unaligned_len = len;
88
89 memcpy(buf, data, unaligned_len);
90 err = shash->update(desc, buf, unaligned_len);
91 memset(buf, 0, unaligned_len);
92
93 return err ?:
94 shash->update(desc, data + unaligned_len, len - unaligned_len);
95}
96
97int crypto_shash_update(struct shash_desc *desc, const u8 *data,
98 unsigned int len)
99{
100 struct crypto_shash *tfm = desc->tfm;
101 struct shash_alg *shash = crypto_shash_alg(tfm);
102 unsigned long alignmask = crypto_shash_alignmask(tfm);
103
104 if ((unsigned long)data & alignmask)
105 return shash_update_unaligned(desc, data, len);
106
107 return shash->update(desc, data, len);
108}
109EXPORT_SYMBOL_GPL(crypto_shash_update);
110
111static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
112{
113 struct crypto_shash *tfm = desc->tfm;
114 unsigned long alignmask = crypto_shash_alignmask(tfm);
115 struct shash_alg *shash = crypto_shash_alg(tfm);
116 unsigned int ds = crypto_shash_digestsize(tfm);
117 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
118 __attribute__ ((aligned));
119 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
120 int err;
121
122 err = shash->final(desc, buf);
123 if (err)
124 goto out;
125
126 memcpy(out, buf, ds);
127
128out:
129 memset(buf, 0, ds);
130 return err;
131}
132
133int crypto_shash_final(struct shash_desc *desc, u8 *out)
134{
135 struct crypto_shash *tfm = desc->tfm;
136 struct shash_alg *shash = crypto_shash_alg(tfm);
137 unsigned long alignmask = crypto_shash_alignmask(tfm);
138
139 if ((unsigned long)out & alignmask)
140 return shash_final_unaligned(desc, out);
141
142 return shash->final(desc, out);
143}
144EXPORT_SYMBOL_GPL(crypto_shash_final);
145
146static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
147 unsigned int len, u8 *out)
148{
149 return crypto_shash_update(desc, data, len) ?:
150 crypto_shash_final(desc, out);
151}
152
153int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
154 unsigned int len, u8 *out)
155{
156 struct crypto_shash *tfm = desc->tfm;
157 struct shash_alg *shash = crypto_shash_alg(tfm);
158 unsigned long alignmask = crypto_shash_alignmask(tfm);
159
160 if (((unsigned long)data | (unsigned long)out) & alignmask)
161 return shash_finup_unaligned(desc, data, len, out);
162
163 return shash->finup(desc, data, len, out);
164}
165EXPORT_SYMBOL_GPL(crypto_shash_finup);
166
167static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
168 unsigned int len, u8 *out)
169{
170 return crypto_shash_init(desc) ?:
171 crypto_shash_finup(desc, data, len, out);
172}
173
174int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
175 unsigned int len, u8 *out)
176{
177 struct crypto_shash *tfm = desc->tfm;
178 struct shash_alg *shash = crypto_shash_alg(tfm);
179 unsigned long alignmask = crypto_shash_alignmask(tfm);
180
181 if (((unsigned long)data | (unsigned long)out) & alignmask)
182 return shash_digest_unaligned(desc, data, len, out);
183
184 return shash->digest(desc, data, len, out);
185}
186EXPORT_SYMBOL_GPL(crypto_shash_digest);
187
188static int shash_default_export(struct shash_desc *desc, void *out)
189{
190 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
191 return 0;
192}
193
194static int shash_default_import(struct shash_desc *desc, const void *in)
195{
196 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
197 return 0;
198}
199
200static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
201 unsigned int keylen)
202{
203 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
204
205 return crypto_shash_setkey(*ctx, key, keylen);
206}
207
208static int shash_async_init(struct ahash_request *req)
209{
210 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
211 struct shash_desc *desc = ahash_request_ctx(req);
212
213 desc->tfm = *ctx;
214 desc->flags = req->base.flags;
215
216 return crypto_shash_init(desc);
217}
218
219int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
220{
221 struct crypto_hash_walk walk;
222 int nbytes;
223
224 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
225 nbytes = crypto_hash_walk_done(&walk, nbytes))
226 nbytes = crypto_shash_update(desc, walk.data, nbytes);
227
228 return nbytes;
229}
230EXPORT_SYMBOL_GPL(shash_ahash_update);
231
232static int shash_async_update(struct ahash_request *req)
233{
234 return shash_ahash_update(req, ahash_request_ctx(req));
235}
236
237static int shash_async_final(struct ahash_request *req)
238{
239 return crypto_shash_final(ahash_request_ctx(req), req->result);
240}
241
242int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
243{
244 struct crypto_hash_walk walk;
245 int nbytes;
246
247 nbytes = crypto_hash_walk_first(req, &walk);
248 if (!nbytes)
249 return crypto_shash_final(desc, req->result);
250
251 do {
252 nbytes = crypto_hash_walk_last(&walk) ?
253 crypto_shash_finup(desc, walk.data, nbytes,
254 req->result) :
255 crypto_shash_update(desc, walk.data, nbytes);
256 nbytes = crypto_hash_walk_done(&walk, nbytes);
257 } while (nbytes > 0);
258
259 return nbytes;
260}
261EXPORT_SYMBOL_GPL(shash_ahash_finup);
262
263static int shash_async_finup(struct ahash_request *req)
264{
265 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
266 struct shash_desc *desc = ahash_request_ctx(req);
267
268 desc->tfm = *ctx;
269 desc->flags = req->base.flags;
270
271 return shash_ahash_finup(req, desc);
272}
273
274int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
275{
276 struct scatterlist *sg = req->src;
277 unsigned int offset = sg->offset;
278 unsigned int nbytes = req->nbytes;
279 int err;
280
281 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
282 void *data;
283
284 data = kmap_atomic(sg_page(sg));
285 err = crypto_shash_digest(desc, data + offset, nbytes,
286 req->result);
287 kunmap_atomic(data);
288 crypto_yield(desc->flags);
289 } else
290 err = crypto_shash_init(desc) ?:
291 shash_ahash_finup(req, desc);
292
293 return err;
294}
295EXPORT_SYMBOL_GPL(shash_ahash_digest);
296
297static int shash_async_digest(struct ahash_request *req)
298{
299 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
300 struct shash_desc *desc = ahash_request_ctx(req);
301
302 desc->tfm = *ctx;
303 desc->flags = req->base.flags;
304
305 return shash_ahash_digest(req, desc);
306}
307
308static int shash_async_export(struct ahash_request *req, void *out)
309{
310 return crypto_shash_export(ahash_request_ctx(req), out);
311}
312
313static int shash_async_import(struct ahash_request *req, const void *in)
314{
315 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
316 struct shash_desc *desc = ahash_request_ctx(req);
317
318 desc->tfm = *ctx;
319 desc->flags = req->base.flags;
320
321 return crypto_shash_import(desc, in);
322}
323
324static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
325{
326 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
327
328 crypto_free_shash(*ctx);
329}
330
331int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
332{
333 struct crypto_alg *calg = tfm->__crt_alg;
334 struct shash_alg *alg = __crypto_shash_alg(calg);
335 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
336 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
337 struct crypto_shash *shash;
338
339 if (!crypto_mod_get(calg))
340 return -EAGAIN;
341
342 shash = crypto_create_tfm(calg, &crypto_shash_type);
343 if (IS_ERR(shash)) {
344 crypto_mod_put(calg);
345 return PTR_ERR(shash);
346 }
347
348 *ctx = shash;
349 tfm->exit = crypto_exit_shash_ops_async;
350
351 crt->init = shash_async_init;
352 crt->update = shash_async_update;
353 crt->final = shash_async_final;
354 crt->finup = shash_async_finup;
355 crt->digest = shash_async_digest;
356
357 if (alg->setkey)
358 crt->setkey = shash_async_setkey;
359 if (alg->export)
360 crt->export = shash_async_export;
361 if (alg->import)
362 crt->import = shash_async_import;
363
364 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
365
366 return 0;
367}
368
369static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
370 unsigned int keylen)
371{
372 struct shash_desc **descp = crypto_hash_ctx(tfm);
373 struct shash_desc *desc = *descp;
374
375 return crypto_shash_setkey(desc->tfm, key, keylen);
376}
377
378static int shash_compat_init(struct hash_desc *hdesc)
379{
380 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
381 struct shash_desc *desc = *descp;
382
383 desc->flags = hdesc->flags;
384
385 return crypto_shash_init(desc);
386}
387
388static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
389 unsigned int len)
390{
391 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
392 struct shash_desc *desc = *descp;
393 struct crypto_hash_walk walk;
394 int nbytes;
395
396 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
397 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
398 nbytes = crypto_shash_update(desc, walk.data, nbytes);
399
400 return nbytes;
401}
402
403static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
404{
405 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
406
407 return crypto_shash_final(*descp, out);
408}
409
410static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
411 unsigned int nbytes, u8 *out)
412{
413 unsigned int offset = sg->offset;
414 int err;
415
416 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
417 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
418 struct shash_desc *desc = *descp;
419 void *data;
420
421 desc->flags = hdesc->flags;
422
423 data = kmap_atomic(sg_page(sg));
424 err = crypto_shash_digest(desc, data + offset, nbytes, out);
425 kunmap_atomic(data);
426 crypto_yield(desc->flags);
427 goto out;
428 }
429
430 err = shash_compat_init(hdesc);
431 if (err)
432 goto out;
433
434 err = shash_compat_update(hdesc, sg, nbytes);
435 if (err)
436 goto out;
437
438 err = shash_compat_final(hdesc, out);
439
440out:
441 return err;
442}
443
444static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
445{
446 struct shash_desc **descp = crypto_tfm_ctx(tfm);
447 struct shash_desc *desc = *descp;
448
449 crypto_free_shash(desc->tfm);
450 kzfree(desc);
451}
452
453static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
454{
455 struct hash_tfm *crt = &tfm->crt_hash;
456 struct crypto_alg *calg = tfm->__crt_alg;
457 struct shash_alg *alg = __crypto_shash_alg(calg);
458 struct shash_desc **descp = crypto_tfm_ctx(tfm);
459 struct crypto_shash *shash;
460 struct shash_desc *desc;
461
462 if (!crypto_mod_get(calg))
463 return -EAGAIN;
464
465 shash = crypto_create_tfm(calg, &crypto_shash_type);
466 if (IS_ERR(shash)) {
467 crypto_mod_put(calg);
468 return PTR_ERR(shash);
469 }
470
471 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
472 GFP_KERNEL);
473 if (!desc) {
474 crypto_free_shash(shash);
475 return -ENOMEM;
476 }
477
478 *descp = desc;
479 desc->tfm = shash;
480 tfm->exit = crypto_exit_shash_ops_compat;
481
482 crt->init = shash_compat_init;
483 crt->update = shash_compat_update;
484 crt->final = shash_compat_final;
485 crt->digest = shash_compat_digest;
486 crt->setkey = shash_compat_setkey;
487
488 crt->digestsize = alg->digestsize;
489
490 return 0;
491}
492
493static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
494{
495 switch (mask & CRYPTO_ALG_TYPE_MASK) {
496 case CRYPTO_ALG_TYPE_HASH_MASK:
497 return crypto_init_shash_ops_compat(tfm);
498 }
499
500 return -EINVAL;
501}
502
503static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
504 u32 mask)
505{
506 switch (mask & CRYPTO_ALG_TYPE_MASK) {
507 case CRYPTO_ALG_TYPE_HASH_MASK:
508 return sizeof(struct shash_desc *);
509 }
510
511 return 0;
512}
513
514static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
515{
516 struct crypto_shash *hash = __crypto_shash_cast(tfm);
517
518 hash->descsize = crypto_shash_alg(hash)->descsize;
519 return 0;
520}
521
522static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
523{
524 return alg->cra_ctxsize;
525}
526
527#ifdef CONFIG_NET
528static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
529{
530 struct crypto_report_hash rhash;
531 struct shash_alg *salg = __crypto_shash_alg(alg);
532
533 strncpy(rhash.type, "shash", sizeof(rhash.type));
534
535 rhash.blocksize = alg->cra_blocksize;
536 rhash.digestsize = salg->digestsize;
537
538 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
539 sizeof(struct crypto_report_hash), &rhash))
540 goto nla_put_failure;
541 return 0;
542
543nla_put_failure:
544 return -EMSGSIZE;
545}
546#else
547static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
548{
549 return -ENOSYS;
550}
551#endif
552
553static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
554 __attribute__ ((unused));
555static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
556{
557 struct shash_alg *salg = __crypto_shash_alg(alg);
558
559 seq_printf(m, "type : shash\n");
560 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
561 seq_printf(m, "digestsize : %u\n", salg->digestsize);
562}
563
564static const struct crypto_type crypto_shash_type = {
565 .ctxsize = crypto_shash_ctxsize,
566 .extsize = crypto_shash_extsize,
567 .init = crypto_init_shash_ops,
568 .init_tfm = crypto_shash_init_tfm,
569#ifdef CONFIG_PROC_FS
570 .show = crypto_shash_show,
571#endif
572 .report = crypto_shash_report,
573 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
574 .maskset = CRYPTO_ALG_TYPE_MASK,
575 .type = CRYPTO_ALG_TYPE_SHASH,
576 .tfmsize = offsetof(struct crypto_shash, base),
577};
578
579struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
580 u32 mask)
581{
582 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
583}
584EXPORT_SYMBOL_GPL(crypto_alloc_shash);
585
586static int shash_prepare_alg(struct shash_alg *alg)
587{
588 struct crypto_alg *base = &alg->base;
589
590 if (alg->digestsize > PAGE_SIZE / 8 ||
591 alg->descsize > PAGE_SIZE / 8 ||
592 alg->statesize > PAGE_SIZE / 8)
593 return -EINVAL;
594
595 base->cra_type = &crypto_shash_type;
596 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
597 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
598
599 if (!alg->finup)
600 alg->finup = shash_finup_unaligned;
601 if (!alg->digest)
602 alg->digest = shash_digest_unaligned;
603 if (!alg->export) {
604 alg->export = shash_default_export;
605 alg->import = shash_default_import;
606 alg->statesize = alg->descsize;
607 }
608 if (!alg->setkey)
609 alg->setkey = shash_no_setkey;
610
611 return 0;
612}
613
614int crypto_register_shash(struct shash_alg *alg)
615{
616 struct crypto_alg *base = &alg->base;
617 int err;
618
619 err = shash_prepare_alg(alg);
620 if (err)
621 return err;
622
623 return crypto_register_alg(base);
624}
625EXPORT_SYMBOL_GPL(crypto_register_shash);
626
627int crypto_unregister_shash(struct shash_alg *alg)
628{
629 return crypto_unregister_alg(&alg->base);
630}
631EXPORT_SYMBOL_GPL(crypto_unregister_shash);
632
633int crypto_register_shashes(struct shash_alg *algs, int count)
634{
635 int i, ret;
636
637 for (i = 0; i < count; i++) {
638 ret = crypto_register_shash(&algs[i]);
639 if (ret)
640 goto err;
641 }
642
643 return 0;
644
645err:
646 for (--i; i >= 0; --i)
647 crypto_unregister_shash(&algs[i]);
648
649 return ret;
650}
651EXPORT_SYMBOL_GPL(crypto_register_shashes);
652
653int crypto_unregister_shashes(struct shash_alg *algs, int count)
654{
655 int i, ret;
656
657 for (i = count - 1; i >= 0; --i) {
658 ret = crypto_unregister_shash(&algs[i]);
659 if (ret)
660 pr_err("Failed to unregister %s %s: %d\n",
661 algs[i].base.cra_driver_name,
662 algs[i].base.cra_name, ret);
663 }
664
665 return 0;
666}
667EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
668
669int shash_register_instance(struct crypto_template *tmpl,
670 struct shash_instance *inst)
671{
672 int err;
673
674 err = shash_prepare_alg(&inst->alg);
675 if (err)
676 return err;
677
678 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
679}
680EXPORT_SYMBOL_GPL(shash_register_instance);
681
682void shash_free_instance(struct crypto_instance *inst)
683{
684 crypto_drop_spawn(crypto_instance_ctx(inst));
685 kfree(shash_instance(inst));
686}
687EXPORT_SYMBOL_GPL(shash_free_instance);
688
689int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
690 struct shash_alg *alg,
691 struct crypto_instance *inst)
692{
693 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
694 &crypto_shash_type);
695}
696EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
697
698struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
699{
700 struct crypto_alg *alg;
701
702 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
703 return IS_ERR(alg) ? ERR_CAST(alg) :
704 container_of(alg, struct shash_alg, base);
705}
706EXPORT_SYMBOL_GPL(shash_attr_alg);
707
708MODULE_LICENSE("GPL");
709MODULE_DESCRIPTION("Synchronous cryptographic hash type");