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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
19int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
20 unsigned int keylen)
21{
22 return -ENOSYS;
23}
24EXPORT_SYMBOL_GPL(shash_no_setkey);
25
26static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
27{
28 if (crypto_shash_alg_needs_key(alg))
29 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
30}
31
32int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
33 unsigned int keylen)
34{
35 struct shash_alg *shash = crypto_shash_alg(tfm);
36 int err;
37
38 err = shash->setkey(tfm, key, keylen);
39 if (unlikely(err)) {
40 shash_set_needkey(tfm, shash);
41 return err;
42 }
43
44 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
45 return 0;
46}
47EXPORT_SYMBOL_GPL(crypto_shash_setkey);
48
49int crypto_shash_update(struct shash_desc *desc, const u8 *data,
50 unsigned int len)
51{
52 return crypto_shash_alg(desc->tfm)->update(desc, data, len);
53}
54EXPORT_SYMBOL_GPL(crypto_shash_update);
55
56int crypto_shash_final(struct shash_desc *desc, u8 *out)
57{
58 return crypto_shash_alg(desc->tfm)->final(desc, out);
59}
60EXPORT_SYMBOL_GPL(crypto_shash_final);
61
62static int shash_default_finup(struct shash_desc *desc, const u8 *data,
63 unsigned int len, u8 *out)
64{
65 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
66
67 return shash->update(desc, data, len) ?:
68 shash->final(desc, out);
69}
70
71int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
72 unsigned int len, u8 *out)
73{
74 return crypto_shash_alg(desc->tfm)->finup(desc, data, len, out);
75}
76EXPORT_SYMBOL_GPL(crypto_shash_finup);
77
78static int shash_default_digest(struct shash_desc *desc, const u8 *data,
79 unsigned int len, u8 *out)
80{
81 struct shash_alg *shash = crypto_shash_alg(desc->tfm);
82
83 return shash->init(desc) ?:
84 shash->finup(desc, data, len, out);
85}
86
87int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
88 unsigned int len, u8 *out)
89{
90 struct crypto_shash *tfm = desc->tfm;
91
92 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
93 return -ENOKEY;
94
95 return crypto_shash_alg(tfm)->digest(desc, data, len, out);
96}
97EXPORT_SYMBOL_GPL(crypto_shash_digest);
98
99int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
100 unsigned int len, u8 *out)
101{
102 SHASH_DESC_ON_STACK(desc, tfm);
103 int err;
104
105 desc->tfm = tfm;
106
107 err = crypto_shash_digest(desc, data, len, out);
108
109 shash_desc_zero(desc);
110
111 return err;
112}
113EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
114
115int crypto_shash_export(struct shash_desc *desc, void *out)
116{
117 struct crypto_shash *tfm = desc->tfm;
118 struct shash_alg *shash = crypto_shash_alg(tfm);
119
120 if (shash->export)
121 return shash->export(desc, out);
122
123 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
124 return 0;
125}
126EXPORT_SYMBOL_GPL(crypto_shash_export);
127
128int crypto_shash_import(struct shash_desc *desc, const void *in)
129{
130 struct crypto_shash *tfm = desc->tfm;
131 struct shash_alg *shash = crypto_shash_alg(tfm);
132
133 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
134 return -ENOKEY;
135
136 if (shash->import)
137 return shash->import(desc, in);
138
139 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
140 return 0;
141}
142EXPORT_SYMBOL_GPL(crypto_shash_import);
143
144static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
145{
146 struct crypto_shash *hash = __crypto_shash_cast(tfm);
147 struct shash_alg *alg = crypto_shash_alg(hash);
148
149 alg->exit_tfm(hash);
150}
151
152static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
153{
154 struct crypto_shash *hash = __crypto_shash_cast(tfm);
155 struct shash_alg *alg = crypto_shash_alg(hash);
156 int err;
157
158 hash->descsize = alg->descsize;
159
160 shash_set_needkey(hash, alg);
161
162 if (alg->exit_tfm)
163 tfm->exit = crypto_shash_exit_tfm;
164
165 if (!alg->init_tfm)
166 return 0;
167
168 err = alg->init_tfm(hash);
169 if (err)
170 return err;
171
172 /* ->init_tfm() may have increased the descsize. */
173 if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
174 if (alg->exit_tfm)
175 alg->exit_tfm(hash);
176 return -EINVAL;
177 }
178
179 return 0;
180}
181
182static void crypto_shash_free_instance(struct crypto_instance *inst)
183{
184 struct shash_instance *shash = shash_instance(inst);
185
186 shash->free(shash);
187}
188
189static int __maybe_unused crypto_shash_report(
190 struct sk_buff *skb, struct crypto_alg *alg)
191{
192 struct crypto_report_hash rhash;
193 struct shash_alg *salg = __crypto_shash_alg(alg);
194
195 memset(&rhash, 0, sizeof(rhash));
196
197 strscpy(rhash.type, "shash", sizeof(rhash.type));
198
199 rhash.blocksize = alg->cra_blocksize;
200 rhash.digestsize = salg->digestsize;
201
202 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
203}
204
205static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
206 __maybe_unused;
207static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
208{
209 struct shash_alg *salg = __crypto_shash_alg(alg);
210
211 seq_printf(m, "type : shash\n");
212 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
213 seq_printf(m, "digestsize : %u\n", salg->digestsize);
214}
215
216const struct crypto_type crypto_shash_type = {
217 .extsize = crypto_alg_extsize,
218 .init_tfm = crypto_shash_init_tfm,
219 .free = crypto_shash_free_instance,
220#ifdef CONFIG_PROC_FS
221 .show = crypto_shash_show,
222#endif
223#if IS_ENABLED(CONFIG_CRYPTO_USER)
224 .report = crypto_shash_report,
225#endif
226 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
227 .maskset = CRYPTO_ALG_TYPE_MASK,
228 .type = CRYPTO_ALG_TYPE_SHASH,
229 .tfmsize = offsetof(struct crypto_shash, base),
230};
231
232int crypto_grab_shash(struct crypto_shash_spawn *spawn,
233 struct crypto_instance *inst,
234 const char *name, u32 type, u32 mask)
235{
236 spawn->base.frontend = &crypto_shash_type;
237 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
238}
239EXPORT_SYMBOL_GPL(crypto_grab_shash);
240
241struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
242 u32 mask)
243{
244 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
245}
246EXPORT_SYMBOL_GPL(crypto_alloc_shash);
247
248int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
249{
250 return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
251}
252EXPORT_SYMBOL_GPL(crypto_has_shash);
253
254struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
255{
256 struct crypto_tfm *tfm = crypto_shash_tfm(hash);
257 struct shash_alg *alg = crypto_shash_alg(hash);
258 struct crypto_shash *nhash;
259 int err;
260
261 if (!crypto_shash_alg_has_setkey(alg)) {
262 tfm = crypto_tfm_get(tfm);
263 if (IS_ERR(tfm))
264 return ERR_CAST(tfm);
265
266 return hash;
267 }
268
269 if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init))
270 return ERR_PTR(-ENOSYS);
271
272 nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
273 if (IS_ERR(nhash))
274 return nhash;
275
276 nhash->descsize = hash->descsize;
277
278 if (alg->clone_tfm) {
279 err = alg->clone_tfm(nhash, hash);
280 if (err) {
281 crypto_free_shash(nhash);
282 return ERR_PTR(err);
283 }
284 }
285
286 return nhash;
287}
288EXPORT_SYMBOL_GPL(crypto_clone_shash);
289
290int hash_prepare_alg(struct hash_alg_common *alg)
291{
292 struct crypto_alg *base = &alg->base;
293
294 if (alg->digestsize > HASH_MAX_DIGESTSIZE)
295 return -EINVAL;
296
297 /* alignmask is not useful for hashes, so it is not supported. */
298 if (base->cra_alignmask)
299 return -EINVAL;
300
301 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
302
303 return 0;
304}
305
306static int shash_prepare_alg(struct shash_alg *alg)
307{
308 struct crypto_alg *base = &alg->halg.base;
309 int err;
310
311 if (alg->descsize > HASH_MAX_DESCSIZE)
312 return -EINVAL;
313
314 if ((alg->export && !alg->import) || (alg->import && !alg->export))
315 return -EINVAL;
316
317 err = hash_prepare_alg(&alg->halg);
318 if (err)
319 return err;
320
321 base->cra_type = &crypto_shash_type;
322 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
323
324 /*
325 * Handle missing optional functions. For each one we can either
326 * install a default here, or we can leave the pointer as NULL and check
327 * the pointer for NULL in crypto_shash_*(), avoiding an indirect call
328 * when the default behavior is desired. For ->finup and ->digest we
329 * install defaults, since for optimal performance algorithms should
330 * implement these anyway. On the other hand, for ->import and
331 * ->export the common case and best performance comes from the simple
332 * memcpy of the shash_desc_ctx, so when those pointers are NULL we
333 * leave them NULL and provide the memcpy with no indirect call.
334 */
335 if (!alg->finup)
336 alg->finup = shash_default_finup;
337 if (!alg->digest)
338 alg->digest = shash_default_digest;
339 if (!alg->export)
340 alg->halg.statesize = alg->descsize;
341 if (!alg->setkey)
342 alg->setkey = shash_no_setkey;
343
344 return 0;
345}
346
347int crypto_register_shash(struct shash_alg *alg)
348{
349 struct crypto_alg *base = &alg->base;
350 int err;
351
352 err = shash_prepare_alg(alg);
353 if (err)
354 return err;
355
356 return crypto_register_alg(base);
357}
358EXPORT_SYMBOL_GPL(crypto_register_shash);
359
360void crypto_unregister_shash(struct shash_alg *alg)
361{
362 crypto_unregister_alg(&alg->base);
363}
364EXPORT_SYMBOL_GPL(crypto_unregister_shash);
365
366int crypto_register_shashes(struct shash_alg *algs, int count)
367{
368 int i, ret;
369
370 for (i = 0; i < count; i++) {
371 ret = crypto_register_shash(&algs[i]);
372 if (ret)
373 goto err;
374 }
375
376 return 0;
377
378err:
379 for (--i; i >= 0; --i)
380 crypto_unregister_shash(&algs[i]);
381
382 return ret;
383}
384EXPORT_SYMBOL_GPL(crypto_register_shashes);
385
386void crypto_unregister_shashes(struct shash_alg *algs, int count)
387{
388 int i;
389
390 for (i = count - 1; i >= 0; --i)
391 crypto_unregister_shash(&algs[i]);
392}
393EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
394
395int shash_register_instance(struct crypto_template *tmpl,
396 struct shash_instance *inst)
397{
398 int err;
399
400 if (WARN_ON(!inst->free))
401 return -EINVAL;
402
403 err = shash_prepare_alg(&inst->alg);
404 if (err)
405 return err;
406
407 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
408}
409EXPORT_SYMBOL_GPL(shash_register_instance);
410
411void shash_free_singlespawn_instance(struct shash_instance *inst)
412{
413 crypto_drop_spawn(shash_instance_ctx(inst));
414 kfree(inst);
415}
416EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
417
418MODULE_LICENSE("GPL");
419MODULE_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
23int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
24 unsigned int keylen)
25{
26 return -ENOSYS;
27}
28EXPORT_SYMBOL_GPL(shash_no_setkey);
29
30static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
31 unsigned int keylen)
32{
33 struct shash_alg *shash = crypto_shash_alg(tfm);
34 unsigned long alignmask = crypto_shash_alignmask(tfm);
35 unsigned long absize;
36 u8 *buffer, *alignbuffer;
37 int err;
38
39 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
40 buffer = kmalloc(absize, GFP_ATOMIC);
41 if (!buffer)
42 return -ENOMEM;
43
44 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
45 memcpy(alignbuffer, key, keylen);
46 err = shash->setkey(tfm, alignbuffer, keylen);
47 kzfree(buffer);
48 return err;
49}
50
51static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
52{
53 if (crypto_shash_alg_has_setkey(alg) &&
54 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
55 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
56}
57
58int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
59 unsigned int keylen)
60{
61 struct shash_alg *shash = crypto_shash_alg(tfm);
62 unsigned long alignmask = crypto_shash_alignmask(tfm);
63 int err;
64
65 if ((unsigned long)key & alignmask)
66 err = shash_setkey_unaligned(tfm, key, keylen);
67 else
68 err = shash->setkey(tfm, key, keylen);
69
70 if (unlikely(err)) {
71 shash_set_needkey(tfm, shash);
72 return err;
73 }
74
75 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
76 return 0;
77}
78EXPORT_SYMBOL_GPL(crypto_shash_setkey);
79
80static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
81 unsigned int len)
82{
83 struct crypto_shash *tfm = desc->tfm;
84 struct shash_alg *shash = crypto_shash_alg(tfm);
85 unsigned long alignmask = crypto_shash_alignmask(tfm);
86 unsigned int unaligned_len = alignmask + 1 -
87 ((unsigned long)data & alignmask);
88 /*
89 * We cannot count on __aligned() working for large values:
90 * https://patchwork.kernel.org/patch/9507697/
91 */
92 u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
93 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
94 int err;
95
96 if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
97 return -EINVAL;
98
99 if (unaligned_len > len)
100 unaligned_len = len;
101
102 memcpy(buf, data, unaligned_len);
103 err = shash->update(desc, buf, unaligned_len);
104 memset(buf, 0, unaligned_len);
105
106 return err ?:
107 shash->update(desc, data + unaligned_len, len - unaligned_len);
108}
109
110int crypto_shash_update(struct shash_desc *desc, const u8 *data,
111 unsigned int len)
112{
113 struct crypto_shash *tfm = desc->tfm;
114 struct shash_alg *shash = crypto_shash_alg(tfm);
115 unsigned long alignmask = crypto_shash_alignmask(tfm);
116
117 if ((unsigned long)data & alignmask)
118 return shash_update_unaligned(desc, data, len);
119
120 return shash->update(desc, data, len);
121}
122EXPORT_SYMBOL_GPL(crypto_shash_update);
123
124static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
125{
126 struct crypto_shash *tfm = desc->tfm;
127 unsigned long alignmask = crypto_shash_alignmask(tfm);
128 struct shash_alg *shash = crypto_shash_alg(tfm);
129 unsigned int ds = crypto_shash_digestsize(tfm);
130 /*
131 * We cannot count on __aligned() working for large values:
132 * https://patchwork.kernel.org/patch/9507697/
133 */
134 u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
135 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
136 int err;
137
138 if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
139 return -EINVAL;
140
141 err = shash->final(desc, buf);
142 if (err)
143 goto out;
144
145 memcpy(out, buf, ds);
146
147out:
148 memset(buf, 0, ds);
149 return err;
150}
151
152int crypto_shash_final(struct shash_desc *desc, u8 *out)
153{
154 struct crypto_shash *tfm = desc->tfm;
155 struct shash_alg *shash = crypto_shash_alg(tfm);
156 unsigned long alignmask = crypto_shash_alignmask(tfm);
157
158 if ((unsigned long)out & alignmask)
159 return shash_final_unaligned(desc, out);
160
161 return shash->final(desc, out);
162}
163EXPORT_SYMBOL_GPL(crypto_shash_final);
164
165static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
166 unsigned int len, u8 *out)
167{
168 return crypto_shash_update(desc, data, len) ?:
169 crypto_shash_final(desc, out);
170}
171
172int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
173 unsigned int len, u8 *out)
174{
175 struct crypto_shash *tfm = desc->tfm;
176 struct shash_alg *shash = crypto_shash_alg(tfm);
177 unsigned long alignmask = crypto_shash_alignmask(tfm);
178
179 if (((unsigned long)data | (unsigned long)out) & alignmask)
180 return shash_finup_unaligned(desc, data, len, out);
181
182 return shash->finup(desc, data, len, out);
183}
184EXPORT_SYMBOL_GPL(crypto_shash_finup);
185
186static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
187 unsigned int len, u8 *out)
188{
189 return crypto_shash_init(desc) ?:
190 crypto_shash_finup(desc, data, len, out);
191}
192
193int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
194 unsigned int len, u8 *out)
195{
196 struct crypto_shash *tfm = desc->tfm;
197 struct shash_alg *shash = crypto_shash_alg(tfm);
198 unsigned long alignmask = crypto_shash_alignmask(tfm);
199
200 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
201 return -ENOKEY;
202
203 if (((unsigned long)data | (unsigned long)out) & alignmask)
204 return shash_digest_unaligned(desc, data, len, out);
205
206 return shash->digest(desc, data, len, out);
207}
208EXPORT_SYMBOL_GPL(crypto_shash_digest);
209
210static int shash_default_export(struct shash_desc *desc, void *out)
211{
212 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
213 return 0;
214}
215
216static int shash_default_import(struct shash_desc *desc, const void *in)
217{
218 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
219 return 0;
220}
221
222static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
223 unsigned int keylen)
224{
225 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
226
227 return crypto_shash_setkey(*ctx, key, keylen);
228}
229
230static int shash_async_init(struct ahash_request *req)
231{
232 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
233 struct shash_desc *desc = ahash_request_ctx(req);
234
235 desc->tfm = *ctx;
236
237 return crypto_shash_init(desc);
238}
239
240int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
241{
242 struct crypto_hash_walk walk;
243 int nbytes;
244
245 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
246 nbytes = crypto_hash_walk_done(&walk, nbytes))
247 nbytes = crypto_shash_update(desc, walk.data, nbytes);
248
249 return nbytes;
250}
251EXPORT_SYMBOL_GPL(shash_ahash_update);
252
253static int shash_async_update(struct ahash_request *req)
254{
255 return shash_ahash_update(req, ahash_request_ctx(req));
256}
257
258static int shash_async_final(struct ahash_request *req)
259{
260 return crypto_shash_final(ahash_request_ctx(req), req->result);
261}
262
263int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
264{
265 struct crypto_hash_walk walk;
266 int nbytes;
267
268 nbytes = crypto_hash_walk_first(req, &walk);
269 if (!nbytes)
270 return crypto_shash_final(desc, req->result);
271
272 do {
273 nbytes = crypto_hash_walk_last(&walk) ?
274 crypto_shash_finup(desc, walk.data, nbytes,
275 req->result) :
276 crypto_shash_update(desc, walk.data, nbytes);
277 nbytes = crypto_hash_walk_done(&walk, nbytes);
278 } while (nbytes > 0);
279
280 return nbytes;
281}
282EXPORT_SYMBOL_GPL(shash_ahash_finup);
283
284static int shash_async_finup(struct ahash_request *req)
285{
286 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
287 struct shash_desc *desc = ahash_request_ctx(req);
288
289 desc->tfm = *ctx;
290
291 return shash_ahash_finup(req, desc);
292}
293
294int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
295{
296 unsigned int nbytes = req->nbytes;
297 struct scatterlist *sg;
298 unsigned int offset;
299 int err;
300
301 if (nbytes &&
302 (sg = req->src, offset = sg->offset,
303 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
304 void *data;
305
306 data = kmap_atomic(sg_page(sg));
307 err = crypto_shash_digest(desc, data + offset, nbytes,
308 req->result);
309 kunmap_atomic(data);
310 } else
311 err = crypto_shash_init(desc) ?:
312 shash_ahash_finup(req, desc);
313
314 return err;
315}
316EXPORT_SYMBOL_GPL(shash_ahash_digest);
317
318static int shash_async_digest(struct ahash_request *req)
319{
320 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
321 struct shash_desc *desc = ahash_request_ctx(req);
322
323 desc->tfm = *ctx;
324
325 return shash_ahash_digest(req, desc);
326}
327
328static int shash_async_export(struct ahash_request *req, void *out)
329{
330 return crypto_shash_export(ahash_request_ctx(req), out);
331}
332
333static int shash_async_import(struct ahash_request *req, const void *in)
334{
335 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
336 struct shash_desc *desc = ahash_request_ctx(req);
337
338 desc->tfm = *ctx;
339
340 return crypto_shash_import(desc, in);
341}
342
343static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
344{
345 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
346
347 crypto_free_shash(*ctx);
348}
349
350int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
351{
352 struct crypto_alg *calg = tfm->__crt_alg;
353 struct shash_alg *alg = __crypto_shash_alg(calg);
354 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
355 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
356 struct crypto_shash *shash;
357
358 if (!crypto_mod_get(calg))
359 return -EAGAIN;
360
361 shash = crypto_create_tfm(calg, &crypto_shash_type);
362 if (IS_ERR(shash)) {
363 crypto_mod_put(calg);
364 return PTR_ERR(shash);
365 }
366
367 *ctx = shash;
368 tfm->exit = crypto_exit_shash_ops_async;
369
370 crt->init = shash_async_init;
371 crt->update = shash_async_update;
372 crt->final = shash_async_final;
373 crt->finup = shash_async_finup;
374 crt->digest = shash_async_digest;
375 if (crypto_shash_alg_has_setkey(alg))
376 crt->setkey = shash_async_setkey;
377
378 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
379 CRYPTO_TFM_NEED_KEY);
380
381 crt->export = shash_async_export;
382 crt->import = shash_async_import;
383
384 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
385
386 return 0;
387}
388
389static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
390{
391 struct crypto_shash *hash = __crypto_shash_cast(tfm);
392 struct shash_alg *alg = crypto_shash_alg(hash);
393
394 hash->descsize = alg->descsize;
395
396 shash_set_needkey(hash, alg);
397
398 return 0;
399}
400
401#ifdef CONFIG_NET
402static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
403{
404 struct crypto_report_hash rhash;
405 struct shash_alg *salg = __crypto_shash_alg(alg);
406
407 memset(&rhash, 0, sizeof(rhash));
408
409 strscpy(rhash.type, "shash", sizeof(rhash.type));
410
411 rhash.blocksize = alg->cra_blocksize;
412 rhash.digestsize = salg->digestsize;
413
414 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
415}
416#else
417static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
418{
419 return -ENOSYS;
420}
421#endif
422
423static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
424 __maybe_unused;
425static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
426{
427 struct shash_alg *salg = __crypto_shash_alg(alg);
428
429 seq_printf(m, "type : shash\n");
430 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
431 seq_printf(m, "digestsize : %u\n", salg->digestsize);
432}
433
434static const struct crypto_type crypto_shash_type = {
435 .extsize = crypto_alg_extsize,
436 .init_tfm = crypto_shash_init_tfm,
437#ifdef CONFIG_PROC_FS
438 .show = crypto_shash_show,
439#endif
440 .report = crypto_shash_report,
441 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
442 .maskset = CRYPTO_ALG_TYPE_MASK,
443 .type = CRYPTO_ALG_TYPE_SHASH,
444 .tfmsize = offsetof(struct crypto_shash, base),
445};
446
447struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
448 u32 mask)
449{
450 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
451}
452EXPORT_SYMBOL_GPL(crypto_alloc_shash);
453
454static int shash_prepare_alg(struct shash_alg *alg)
455{
456 struct crypto_alg *base = &alg->base;
457
458 if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
459 alg->descsize > HASH_MAX_DESCSIZE ||
460 alg->statesize > HASH_MAX_STATESIZE)
461 return -EINVAL;
462
463 if ((alg->export && !alg->import) || (alg->import && !alg->export))
464 return -EINVAL;
465
466 base->cra_type = &crypto_shash_type;
467 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
468 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
469
470 if (!alg->finup)
471 alg->finup = shash_finup_unaligned;
472 if (!alg->digest)
473 alg->digest = shash_digest_unaligned;
474 if (!alg->export) {
475 alg->export = shash_default_export;
476 alg->import = shash_default_import;
477 alg->statesize = alg->descsize;
478 }
479 if (!alg->setkey)
480 alg->setkey = shash_no_setkey;
481
482 return 0;
483}
484
485int crypto_register_shash(struct shash_alg *alg)
486{
487 struct crypto_alg *base = &alg->base;
488 int err;
489
490 err = shash_prepare_alg(alg);
491 if (err)
492 return err;
493
494 return crypto_register_alg(base);
495}
496EXPORT_SYMBOL_GPL(crypto_register_shash);
497
498int crypto_unregister_shash(struct shash_alg *alg)
499{
500 return crypto_unregister_alg(&alg->base);
501}
502EXPORT_SYMBOL_GPL(crypto_unregister_shash);
503
504int crypto_register_shashes(struct shash_alg *algs, int count)
505{
506 int i, ret;
507
508 for (i = 0; i < count; i++) {
509 ret = crypto_register_shash(&algs[i]);
510 if (ret)
511 goto err;
512 }
513
514 return 0;
515
516err:
517 for (--i; i >= 0; --i)
518 crypto_unregister_shash(&algs[i]);
519
520 return ret;
521}
522EXPORT_SYMBOL_GPL(crypto_register_shashes);
523
524int crypto_unregister_shashes(struct shash_alg *algs, int count)
525{
526 int i, ret;
527
528 for (i = count - 1; i >= 0; --i) {
529 ret = crypto_unregister_shash(&algs[i]);
530 if (ret)
531 pr_err("Failed to unregister %s %s: %d\n",
532 algs[i].base.cra_driver_name,
533 algs[i].base.cra_name, ret);
534 }
535
536 return 0;
537}
538EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
539
540int shash_register_instance(struct crypto_template *tmpl,
541 struct shash_instance *inst)
542{
543 int err;
544
545 err = shash_prepare_alg(&inst->alg);
546 if (err)
547 return err;
548
549 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
550}
551EXPORT_SYMBOL_GPL(shash_register_instance);
552
553void shash_free_instance(struct crypto_instance *inst)
554{
555 crypto_drop_spawn(crypto_instance_ctx(inst));
556 kfree(shash_instance(inst));
557}
558EXPORT_SYMBOL_GPL(shash_free_instance);
559
560int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
561 struct shash_alg *alg,
562 struct crypto_instance *inst)
563{
564 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
565 &crypto_shash_type);
566}
567EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
568
569struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
570{
571 struct crypto_alg *alg;
572
573 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
574 return IS_ERR(alg) ? ERR_CAST(alg) :
575 container_of(alg, struct shash_alg, base);
576}
577EXPORT_SYMBOL_GPL(shash_attr_alg);
578
579MODULE_LICENSE("GPL");
580MODULE_DESCRIPTION("Synchronous cryptographic hash type");