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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// 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");