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2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
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2/*
3 * Synchronous Cryptographic Hash operations.
4 *
5 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
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6 */
7
3b2f6df0 8#include <crypto/scatterwalk.h>
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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>
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15#include <linux/cryptouser.h>
16#include <net/netlink.h>
d8c34b94 17#include <linux/compiler.h>
7b5a080b 18
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19#include "internal.h"
20
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21static const struct crypto_type crypto_shash_type;
22
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23int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
24 unsigned int keylen)
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25{
26 return -ENOSYS;
27}
af3ff804 28EXPORT_SYMBOL_GPL(shash_no_setkey);
57cfe44b 29
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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
18eb8ea6 39 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
9039f3ef 40 buffer = kmalloc(absize, GFP_ATOMIC);
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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);
8c32c516 47 kzfree(buffer);
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48 return err;
49}
50
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51static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
52{
c2881789 53 if (crypto_shash_alg_needs_key(alg))
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54 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
55}
56
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57int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
58 unsigned int keylen)
59{
60 struct shash_alg *shash = crypto_shash_alg(tfm);
61 unsigned long alignmask = crypto_shash_alignmask(tfm);
9fa68f62 62 int err;
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63
64 if ((unsigned long)key & alignmask)
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65 err = shash_setkey_unaligned(tfm, key, keylen);
66 else
67 err = shash->setkey(tfm, key, keylen);
68
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69 if (unlikely(err)) {
70 shash_set_needkey(tfm, shash);
9fa68f62 71 return err;
ba7d7433 72 }
7b5a080b 73
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74 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
75 return 0;
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76}
77EXPORT_SYMBOL_GPL(crypto_shash_setkey);
78
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79static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
80 unsigned int len)
81{
82 struct crypto_shash *tfm = desc->tfm;
83 struct shash_alg *shash = crypto_shash_alg(tfm);
84 unsigned long alignmask = crypto_shash_alignmask(tfm);
85 unsigned int unaligned_len = alignmask + 1 -
86 ((unsigned long)data & alignmask);
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87 /*
88 * We cannot count on __aligned() working for large values:
89 * https://patchwork.kernel.org/patch/9507697/
90 */
91 u8 ubuf[MAX_ALGAPI_ALIGNMASK * 2];
0e2d3a12 92 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516 93 int err;
7b5a080b 94
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95 if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
96 return -EINVAL;
97
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98 if (unaligned_len > len)
99 unaligned_len = len;
100
7b5a080b 101 memcpy(buf, data, unaligned_len);
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102 err = shash->update(desc, buf, unaligned_len);
103 memset(buf, 0, unaligned_len);
7b5a080b 104
8c32c516 105 return err ?:
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106 shash->update(desc, data + unaligned_len, len - unaligned_len);
107}
108
109int crypto_shash_update(struct shash_desc *desc, const u8 *data,
110 unsigned int len)
111{
112 struct crypto_shash *tfm = desc->tfm;
113 struct shash_alg *shash = crypto_shash_alg(tfm);
114 unsigned long alignmask = crypto_shash_alignmask(tfm);
115
116 if ((unsigned long)data & alignmask)
117 return shash_update_unaligned(desc, data, len);
118
119 return shash->update(desc, data, len);
120}
121EXPORT_SYMBOL_GPL(crypto_shash_update);
122
123static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
124{
125 struct crypto_shash *tfm = desc->tfm;
126 unsigned long alignmask = crypto_shash_alignmask(tfm);
127 struct shash_alg *shash = crypto_shash_alg(tfm);
128 unsigned int ds = crypto_shash_digestsize(tfm);
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129 /*
130 * We cannot count on __aligned() working for large values:
131 * https://patchwork.kernel.org/patch/9507697/
132 */
133 u8 ubuf[MAX_ALGAPI_ALIGNMASK + HASH_MAX_DIGESTSIZE];
0e2d3a12 134 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
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135 int err;
136
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137 if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
138 return -EINVAL;
139
7b5a080b 140 err = shash->final(desc, buf);
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141 if (err)
142 goto out;
143
7b5a080b 144 memcpy(out, buf, ds);
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145
146out:
147 memset(buf, 0, ds);
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148 return err;
149}
150
151int crypto_shash_final(struct shash_desc *desc, u8 *out)
152{
153 struct crypto_shash *tfm = desc->tfm;
154 struct shash_alg *shash = crypto_shash_alg(tfm);
155 unsigned long alignmask = crypto_shash_alignmask(tfm);
156
157 if ((unsigned long)out & alignmask)
158 return shash_final_unaligned(desc, out);
159
160 return shash->final(desc, out);
161}
162EXPORT_SYMBOL_GPL(crypto_shash_final);
163
164static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
165 unsigned int len, u8 *out)
166{
167 return crypto_shash_update(desc, data, len) ?:
168 crypto_shash_final(desc, out);
169}
170
171int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
172 unsigned int len, u8 *out)
173{
174 struct crypto_shash *tfm = desc->tfm;
175 struct shash_alg *shash = crypto_shash_alg(tfm);
176 unsigned long alignmask = crypto_shash_alignmask(tfm);
177
8267adab 178 if (((unsigned long)data | (unsigned long)out) & alignmask)
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179 return shash_finup_unaligned(desc, data, len, out);
180
181 return shash->finup(desc, data, len, out);
182}
183EXPORT_SYMBOL_GPL(crypto_shash_finup);
184
185static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
186 unsigned int len, u8 *out)
187{
188 return crypto_shash_init(desc) ?:
f88ad8de 189 crypto_shash_finup(desc, data, len, out);
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190}
191
192int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
193 unsigned int len, u8 *out)
194{
195 struct crypto_shash *tfm = desc->tfm;
196 struct shash_alg *shash = crypto_shash_alg(tfm);
197 unsigned long alignmask = crypto_shash_alignmask(tfm);
198
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199 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
200 return -ENOKEY;
201
8267adab 202 if (((unsigned long)data | (unsigned long)out) & alignmask)
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203 return shash_digest_unaligned(desc, data, len, out);
204
205 return shash->digest(desc, data, len, out);
206}
207EXPORT_SYMBOL_GPL(crypto_shash_digest);
208
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209int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
210 unsigned int len, u8 *out)
211{
212 SHASH_DESC_ON_STACK(desc, tfm);
213 int err;
214
215 desc->tfm = tfm;
216
217 err = crypto_shash_digest(desc, data, len, out);
218
219 shash_desc_zero(desc);
220
221 return err;
222}
223EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
224
f592682f 225static int shash_default_export(struct shash_desc *desc, void *out)
dec8b786 226{
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227 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
228 return 0;
99d27e1c 229}
dec8b786 230
f592682f 231static int shash_default_import(struct shash_desc *desc, const void *in)
99d27e1c 232{
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233 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
234 return 0;
dec8b786 235}
dec8b786 236
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237static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
238 unsigned int keylen)
239{
240 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
241
242 return crypto_shash_setkey(*ctx, key, keylen);
243}
244
245static int shash_async_init(struct ahash_request *req)
246{
247 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
248 struct shash_desc *desc = ahash_request_ctx(req);
249
250 desc->tfm = *ctx;
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251
252 return crypto_shash_init(desc);
253}
254
7eddf95e 255int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
3b2f6df0 256{
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257 struct crypto_hash_walk walk;
258 int nbytes;
259
260 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
261 nbytes = crypto_hash_walk_done(&walk, nbytes))
262 nbytes = crypto_shash_update(desc, walk.data, nbytes);
263
264 return nbytes;
265}
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266EXPORT_SYMBOL_GPL(shash_ahash_update);
267
268static int shash_async_update(struct ahash_request *req)
269{
270 return shash_ahash_update(req, ahash_request_ctx(req));
271}
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272
273static int shash_async_final(struct ahash_request *req)
274{
275 return crypto_shash_final(ahash_request_ctx(req), req->result);
276}
277
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278int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
279{
280 struct crypto_hash_walk walk;
281 int nbytes;
282
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283 nbytes = crypto_hash_walk_first(req, &walk);
284 if (!nbytes)
285 return crypto_shash_final(desc, req->result);
286
287 do {
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288 nbytes = crypto_hash_walk_last(&walk) ?
289 crypto_shash_finup(desc, walk.data, nbytes,
290 req->result) :
291 crypto_shash_update(desc, walk.data, nbytes);
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292 nbytes = crypto_hash_walk_done(&walk, nbytes);
293 } while (nbytes > 0);
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294
295 return nbytes;
296}
297EXPORT_SYMBOL_GPL(shash_ahash_finup);
298
299static int shash_async_finup(struct ahash_request *req)
300{
301 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
302 struct shash_desc *desc = ahash_request_ctx(req);
303
304 desc->tfm = *ctx;
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305
306 return shash_ahash_finup(req, desc);
307}
308
7eddf95e 309int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
3b2f6df0 310{
3b2f6df0 311 unsigned int nbytes = req->nbytes;
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312 struct scatterlist *sg;
313 unsigned int offset;
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314 int err;
315
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316 if (nbytes &&
317 (sg = req->src, offset = sg->offset,
67cb60e4 318 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
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319 void *data;
320
f0dfc0b0 321 data = kmap_atomic(sg_page(sg));
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322 err = crypto_shash_digest(desc, data + offset, nbytes,
323 req->result);
f0dfc0b0 324 kunmap_atomic(data);
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325 } else
326 err = crypto_shash_init(desc) ?:
66f6ce5e 327 shash_ahash_finup(req, desc);
3b2f6df0 328
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329 return err;
330}
331EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0 332
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333static int shash_async_digest(struct ahash_request *req)
334{
335 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
336 struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0 337
7eddf95e 338 desc->tfm = *ctx;
3b2f6df0 339
7eddf95e 340 return shash_ahash_digest(req, desc);
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341}
342
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343static int shash_async_export(struct ahash_request *req, void *out)
344{
345 return crypto_shash_export(ahash_request_ctx(req), out);
346}
347
348static int shash_async_import(struct ahash_request *req, const void *in)
349{
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350 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
351 struct shash_desc *desc = ahash_request_ctx(req);
352
353 desc->tfm = *ctx;
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354
355 return crypto_shash_import(desc, in);
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356}
357
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358static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
359{
360 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
361
362 crypto_free_shash(*ctx);
363}
364
88056ec3 365int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
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366{
367 struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e 368 struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3 369 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
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370 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
371 struct crypto_shash *shash;
372
373 if (!crypto_mod_get(calg))
374 return -EAGAIN;
375
3f683d61 376 shash = crypto_create_tfm(calg, &crypto_shash_type);
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377 if (IS_ERR(shash)) {
378 crypto_mod_put(calg);
379 return PTR_ERR(shash);
380 }
381
382 *ctx = shash;
383 tfm->exit = crypto_exit_shash_ops_async;
384
385 crt->init = shash_async_init;
386 crt->update = shash_async_update;
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387 crt->final = shash_async_final;
388 crt->finup = shash_async_finup;
3b2f6df0 389 crt->digest = shash_async_digest;
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390 if (crypto_shash_alg_has_setkey(alg))
391 crt->setkey = shash_async_setkey;
00420a65 392
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393 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
394 CRYPTO_TFM_NEED_KEY);
66f6ce5e 395
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396 crt->export = shash_async_export;
397 crt->import = shash_async_import;
3b2f6df0 398
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399 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
400
401 return 0;
402}
403
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404static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
405{
406 struct crypto_shash *hash = __crypto_shash_cast(tfm);
407 struct shash_alg *alg = crypto_shash_alg(hash);
408
409 alg->exit_tfm(hash);
410}
411
2ca33da1 412static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b 413{
113adefc 414 struct crypto_shash *hash = __crypto_shash_cast(tfm);
9fa68f62 415 struct shash_alg *alg = crypto_shash_alg(hash);
fbce6be5 416 int err;
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417
418 hash->descsize = alg->descsize;
419
ba7d7433 420 shash_set_needkey(hash, alg);
113adefc 421
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422 if (alg->exit_tfm)
423 tfm->exit = crypto_shash_exit_tfm;
424
425 if (!alg->init_tfm)
426 return 0;
427
428 err = alg->init_tfm(hash);
429 if (err)
430 return err;
431
432 /* ->init_tfm() may have increased the descsize. */
433 if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
434 if (alg->exit_tfm)
435 alg->exit_tfm(hash);
436 return -EINVAL;
437 }
438
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439 return 0;
440}
441
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442static void crypto_shash_free_instance(struct crypto_instance *inst)
443{
444 struct shash_instance *shash = shash_instance(inst);
445
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446 shash->free(shash);
447}
448
3acc8473 449#ifdef CONFIG_NET
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450static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
451{
452 struct crypto_report_hash rhash;
453 struct shash_alg *salg = __crypto_shash_alg(alg);
454
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455 memset(&rhash, 0, sizeof(rhash));
456
457 strscpy(rhash.type, "shash", sizeof(rhash.type));
9a5467bf 458
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459 rhash.blocksize = alg->cra_blocksize;
460 rhash.digestsize = salg->digestsize;
461
37db69e0 462 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
f4d663ce 463}
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464#else
465static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
466{
467 return -ENOSYS;
468}
469#endif
f4d663ce 470
7b5a080b 471static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
d8c34b94 472 __maybe_unused;
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473static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
474{
475 struct shash_alg *salg = __crypto_shash_alg(alg);
476
477 seq_printf(m, "type : shash\n");
478 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
479 seq_printf(m, "digestsize : %u\n", salg->digestsize);
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480}
481
482static const struct crypto_type crypto_shash_type = {
ac611680 483 .extsize = crypto_alg_extsize,
7b5a080b 484 .init_tfm = crypto_shash_init_tfm,
48fb3e57 485 .free = crypto_shash_free_instance,
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486#ifdef CONFIG_PROC_FS
487 .show = crypto_shash_show,
488#endif
f4d663ce 489 .report = crypto_shash_report,
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490 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
491 .maskset = CRYPTO_ALG_TYPE_MASK,
492 .type = CRYPTO_ALG_TYPE_SHASH,
493 .tfmsize = offsetof(struct crypto_shash, base),
494};
495
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496int crypto_grab_shash(struct crypto_shash_spawn *spawn,
497 struct crypto_instance *inst,
498 const char *name, u32 type, u32 mask)
499{
500 spawn->base.frontend = &crypto_shash_type;
501 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
502}
503EXPORT_SYMBOL_GPL(crypto_grab_shash);
504
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505struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
506 u32 mask)
507{
3f683d61 508 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
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509}
510EXPORT_SYMBOL_GPL(crypto_alloc_shash);
511
619a6ebd 512static int shash_prepare_alg(struct shash_alg *alg)
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513{
514 struct crypto_alg *base = &alg->base;
515
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516 if (alg->digestsize > HASH_MAX_DIGESTSIZE ||
517 alg->descsize > HASH_MAX_DESCSIZE ||
518 alg->statesize > HASH_MAX_STATESIZE)
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519 return -EINVAL;
520
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521 if ((alg->export && !alg->import) || (alg->import && !alg->export))
522 return -EINVAL;
523
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524 base->cra_type = &crypto_shash_type;
525 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
526 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
99d27e1c 527
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528 if (!alg->finup)
529 alg->finup = shash_finup_unaligned;
530 if (!alg->digest)
531 alg->digest = shash_digest_unaligned;
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532 if (!alg->export) {
533 alg->export = shash_default_export;
534 alg->import = shash_default_import;
535 alg->statesize = alg->descsize;
536 }
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537 if (!alg->setkey)
538 alg->setkey = shash_no_setkey;
99d27e1c 539
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540 return 0;
541}
542
543int crypto_register_shash(struct shash_alg *alg)
544{
545 struct crypto_alg *base = &alg->base;
546 int err;
547
548 err = shash_prepare_alg(alg);
549 if (err)
550 return err;
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551
552 return crypto_register_alg(base);
553}
554EXPORT_SYMBOL_GPL(crypto_register_shash);
555
c6d633a9 556void crypto_unregister_shash(struct shash_alg *alg)
7b5a080b 557{
c6d633a9 558 crypto_unregister_alg(&alg->base);
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559}
560EXPORT_SYMBOL_GPL(crypto_unregister_shash);
561
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562int crypto_register_shashes(struct shash_alg *algs, int count)
563{
564 int i, ret;
565
566 for (i = 0; i < count; i++) {
567 ret = crypto_register_shash(&algs[i]);
568 if (ret)
569 goto err;
570 }
571
572 return 0;
573
574err:
575 for (--i; i >= 0; --i)
576 crypto_unregister_shash(&algs[i]);
577
578 return ret;
579}
580EXPORT_SYMBOL_GPL(crypto_register_shashes);
581
c6d633a9 582void crypto_unregister_shashes(struct shash_alg *algs, int count)
50fc3e8d 583{
c6d633a9 584 int i;
50fc3e8d 585
c6d633a9
EB
586 for (i = count - 1; i >= 0; --i)
587 crypto_unregister_shash(&algs[i]);
50fc3e8d
JK
588}
589EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
590
619a6ebd
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591int shash_register_instance(struct crypto_template *tmpl,
592 struct shash_instance *inst)
593{
594 int err;
595
d4fdc2df
EB
596 if (WARN_ON(!inst->free))
597 return -EINVAL;
598
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599 err = shash_prepare_alg(&inst->alg);
600 if (err)
601 return err;
602
603 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
604}
605EXPORT_SYMBOL_GPL(shash_register_instance);
606
a39c66cc 607void shash_free_singlespawn_instance(struct shash_instance *inst)
2e4fddd8 608{
a39c66cc
EB
609 crypto_drop_spawn(shash_instance_ctx(inst));
610 kfree(inst);
2e4fddd8 611}
a39c66cc 612EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
2e4fddd8 613
7b5a080b
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614MODULE_LICENSE("GPL");
615MODULE_DESCRIPTION("Synchronous cryptographic hash type");