Blame view
crypto/shash.c
14.1 KB
7b5a080b3
|
1 2 3 4 5 6 7 8 9 10 11 |
/* * Synchronous Cryptographic Hash operations. * * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ |
3b2f6df08
|
12 |
#include <crypto/scatterwalk.h> |
7b5a080b3
|
13 14 15 16 17 18 |
#include <crypto/internal/hash.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/seq_file.h> |
f4d663ce6
|
19 20 |
#include <linux/cryptouser.h> #include <net/netlink.h> |
d8c34b949
|
21 |
#include <linux/compiler.h> |
7b5a080b3
|
22 |
|
3b2f6df08
|
23 |
#include "internal.h" |
3f683d617
|
24 |
static const struct crypto_type crypto_shash_type; |
57cfe44bc
|
25 26 27 28 29 |
static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { return -ENOSYS; } |
7b5a080b3
|
30 31 32 33 34 35 36 37 |
static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); unsigned long absize; u8 *buffer, *alignbuffer; int err; |
18eb8ea6e
|
38 |
absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
7b5a080b3
|
39 40 41 42 43 44 45 |
buffer = kmalloc(absize, GFP_KERNEL); if (!buffer) return -ENOMEM; alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); memcpy(alignbuffer, key, keylen); err = shash->setkey(tfm, alignbuffer, keylen); |
8c32c516e
|
46 |
kzfree(buffer); |
7b5a080b3
|
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 |
return err; } int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) { struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); if ((unsigned long)key & alignmask) return shash_setkey_unaligned(tfm, key, keylen); return shash->setkey(tfm, key, keylen); } EXPORT_SYMBOL_GPL(crypto_shash_setkey); static inline unsigned int shash_align_buffer_size(unsigned len, unsigned long mask) { |
d8c34b949
|
66 |
typedef u8 __aligned_largest u8_aligned; |
66d8ea572
|
67 |
return len + (mask & ~(__alignof__(u8_aligned) - 1)); |
7b5a080b3
|
68 69 70 71 72 73 74 75 76 77 |
} static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, unsigned int len) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); unsigned int unaligned_len = alignmask + 1 - ((unsigned long)data & alignmask); |
0e2d3a126
|
78 |
u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)] |
d8c34b949
|
79 |
__aligned_largest; |
0e2d3a126
|
80 |
u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); |
8c32c516e
|
81 |
int err; |
7b5a080b3
|
82 |
|
f4f689933
|
83 84 |
if (unaligned_len > len) unaligned_len = len; |
7b5a080b3
|
85 |
memcpy(buf, data, unaligned_len); |
8c32c516e
|
86 87 |
err = shash->update(desc, buf, unaligned_len); memset(buf, 0, unaligned_len); |
7b5a080b3
|
88 |
|
8c32c516e
|
89 |
return err ?: |
7b5a080b3
|
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 |
shash->update(desc, data + unaligned_len, len - unaligned_len); } int crypto_shash_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); if ((unsigned long)data & alignmask) return shash_update_unaligned(desc, data, len); return shash->update(desc, data, len); } EXPORT_SYMBOL_GPL(crypto_shash_update); static int shash_final_unaligned(struct shash_desc *desc, u8 *out) { struct crypto_shash *tfm = desc->tfm; unsigned long alignmask = crypto_shash_alignmask(tfm); struct shash_alg *shash = crypto_shash_alg(tfm); unsigned int ds = crypto_shash_digestsize(tfm); |
0e2d3a126
|
113 |
u8 ubuf[shash_align_buffer_size(ds, alignmask)] |
d8c34b949
|
114 |
__aligned_largest; |
0e2d3a126
|
115 |
u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); |
7b5a080b3
|
116 117 118 |
int err; err = shash->final(desc, buf); |
8c32c516e
|
119 120 |
if (err) goto out; |
7b5a080b3
|
121 |
memcpy(out, buf, ds); |
8c32c516e
|
122 123 124 |
out: memset(buf, 0, ds); |
7b5a080b3
|
125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 |
return err; } int crypto_shash_final(struct shash_desc *desc, u8 *out) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); if ((unsigned long)out & alignmask) return shash_final_unaligned(desc, out); return shash->final(desc, out); } EXPORT_SYMBOL_GPL(crypto_shash_final); static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { return crypto_shash_update(desc, data, len) ?: crypto_shash_final(desc, out); } int crypto_shash_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); |
8267adab9
|
154 |
if (((unsigned long)data | (unsigned long)out) & alignmask) |
7b5a080b3
|
155 156 157 158 159 160 161 162 163 164 |
return shash_finup_unaligned(desc, data, len, out); return shash->finup(desc, data, len, out); } EXPORT_SYMBOL_GPL(crypto_shash_finup); static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { return crypto_shash_init(desc) ?: |
f88ad8de2
|
165 |
crypto_shash_finup(desc, data, len, out); |
7b5a080b3
|
166 167 168 169 170 171 172 173 |
} int crypto_shash_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { struct crypto_shash *tfm = desc->tfm; struct shash_alg *shash = crypto_shash_alg(tfm); unsigned long alignmask = crypto_shash_alignmask(tfm); |
8267adab9
|
174 |
if (((unsigned long)data | (unsigned long)out) & alignmask) |
7b5a080b3
|
175 176 177 178 179 |
return shash_digest_unaligned(desc, data, len, out); return shash->digest(desc, data, len, out); } EXPORT_SYMBOL_GPL(crypto_shash_digest); |
f592682f9
|
180 |
static int shash_default_export(struct shash_desc *desc, void *out) |
dec8b7860
|
181 |
{ |
f592682f9
|
182 183 |
memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm)); return 0; |
99d27e1c5
|
184 |
} |
dec8b7860
|
185 |
|
f592682f9
|
186 |
static int shash_default_import(struct shash_desc *desc, const void *in) |
99d27e1c5
|
187 |
{ |
f592682f9
|
188 189 |
memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm)); return 0; |
dec8b7860
|
190 |
} |
dec8b7860
|
191 |
|
3b2f6df08
|
192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 |
static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, unsigned int keylen) { struct crypto_shash **ctx = crypto_ahash_ctx(tfm); return crypto_shash_setkey(*ctx, key, keylen); } static int shash_async_init(struct ahash_request *req) { struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; desc->flags = req->base.flags; return crypto_shash_init(desc); } |
7eddf95ec
|
210 |
int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc) |
3b2f6df08
|
211 |
{ |
3b2f6df08
|
212 213 214 215 216 217 218 219 220 |
struct crypto_hash_walk walk; int nbytes; for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes)) nbytes = crypto_shash_update(desc, walk.data, nbytes); return nbytes; } |
7eddf95ec
|
221 222 223 224 225 226 |
EXPORT_SYMBOL_GPL(shash_ahash_update); static int shash_async_update(struct ahash_request *req) { return shash_ahash_update(req, ahash_request_ctx(req)); } |
3b2f6df08
|
227 228 229 230 231 |
static int shash_async_final(struct ahash_request *req) { return crypto_shash_final(ahash_request_ctx(req), req->result); } |
66f6ce5e5
|
232 233 234 235 |
int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc) { struct crypto_hash_walk walk; int nbytes; |
cbc86b916
|
236 237 238 239 240 |
nbytes = crypto_hash_walk_first(req, &walk); if (!nbytes) return crypto_shash_final(desc, req->result); do { |
66f6ce5e5
|
241 242 243 244 |
nbytes = crypto_hash_walk_last(&walk) ? crypto_shash_finup(desc, walk.data, nbytes, req->result) : crypto_shash_update(desc, walk.data, nbytes); |
cbc86b916
|
245 246 |
nbytes = crypto_hash_walk_done(&walk, nbytes); } while (nbytes > 0); |
66f6ce5e5
|
247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 |
return nbytes; } EXPORT_SYMBOL_GPL(shash_ahash_finup); static int shash_async_finup(struct ahash_request *req) { struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; desc->flags = req->base.flags; return shash_ahash_finup(req, desc); } |
7eddf95ec
|
262 |
int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) |
3b2f6df08
|
263 264 265 266 267 268 269 |
{ struct scatterlist *sg = req->src; unsigned int offset = sg->offset; unsigned int nbytes = req->nbytes; int err; if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { |
3b2f6df08
|
270 |
void *data; |
f0dfc0b0b
|
271 |
data = kmap_atomic(sg_page(sg)); |
3b2f6df08
|
272 273 |
err = crypto_shash_digest(desc, data + offset, nbytes, req->result); |
f0dfc0b0b
|
274 |
kunmap_atomic(data); |
3b2f6df08
|
275 |
crypto_yield(desc->flags); |
7eddf95ec
|
276 277 |
} else err = crypto_shash_init(desc) ?: |
66f6ce5e5
|
278 |
shash_ahash_finup(req, desc); |
3b2f6df08
|
279 |
|
7eddf95ec
|
280 281 282 |
return err; } EXPORT_SYMBOL_GPL(shash_ahash_digest); |
3b2f6df08
|
283 |
|
7eddf95ec
|
284 285 286 287 |
static int shash_async_digest(struct ahash_request *req) { struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); struct shash_desc *desc = ahash_request_ctx(req); |
3b2f6df08
|
288 |
|
7eddf95ec
|
289 290 |
desc->tfm = *ctx; desc->flags = req->base.flags; |
3b2f6df08
|
291 |
|
7eddf95ec
|
292 |
return shash_ahash_digest(req, desc); |
3b2f6df08
|
293 |
} |
66f6ce5e5
|
294 295 296 297 298 299 300 |
static int shash_async_export(struct ahash_request *req, void *out) { return crypto_shash_export(ahash_request_ctx(req), out); } static int shash_async_import(struct ahash_request *req, const void *in) { |
90246e79a
|
301 302 303 304 305 306 307 |
struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; desc->flags = req->base.flags; return crypto_shash_import(desc, in); |
66f6ce5e5
|
308 |
} |
3b2f6df08
|
309 310 311 312 313 314 |
static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) { struct crypto_shash **ctx = crypto_tfm_ctx(tfm); crypto_free_shash(*ctx); } |
88056ec34
|
315 |
int crypto_init_shash_ops_async(struct crypto_tfm *tfm) |
3b2f6df08
|
316 317 |
{ struct crypto_alg *calg = tfm->__crt_alg; |
66f6ce5e5
|
318 |
struct shash_alg *alg = __crypto_shash_alg(calg); |
88056ec34
|
319 |
struct crypto_ahash *crt = __crypto_ahash_cast(tfm); |
3b2f6df08
|
320 321 322 323 324 |
struct crypto_shash **ctx = crypto_tfm_ctx(tfm); struct crypto_shash *shash; if (!crypto_mod_get(calg)) return -EAGAIN; |
3f683d617
|
325 |
shash = crypto_create_tfm(calg, &crypto_shash_type); |
3b2f6df08
|
326 327 328 329 330 331 332 333 334 335 |
if (IS_ERR(shash)) { crypto_mod_put(calg); return PTR_ERR(shash); } *ctx = shash; tfm->exit = crypto_exit_shash_ops_async; crt->init = shash_async_init; crt->update = shash_async_update; |
66f6ce5e5
|
336 337 |
crt->final = shash_async_final; crt->finup = shash_async_finup; |
3b2f6df08
|
338 |
crt->digest = shash_async_digest; |
00420a65f
|
339 340 341 |
crt->setkey = shash_async_setkey; crt->has_setkey = alg->setkey != shash_no_setkey; |
66f6ce5e5
|
342 |
|
66f6ce5e5
|
343 344 |
if (alg->export) crt->export = shash_async_export; |
0044f3eda
|
345 |
if (alg->import) |
66f6ce5e5
|
346 |
crt->import = shash_async_import; |
3b2f6df08
|
347 |
|
3b2f6df08
|
348 349 350 351 |
crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); return 0; } |
2ca33da1d
|
352 |
static int crypto_shash_init_tfm(struct crypto_tfm *tfm) |
7b5a080b3
|
353 |
{ |
113adefc7
|
354 355 356 |
struct crypto_shash *hash = __crypto_shash_cast(tfm); hash->descsize = crypto_shash_alg(hash)->descsize; |
7b5a080b3
|
357 358 |
return 0; } |
3acc84739
|
359 |
#ifdef CONFIG_NET |
f4d663ce6
|
360 361 362 363 |
static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_hash rhash; struct shash_alg *salg = __crypto_shash_alg(alg); |
9a5467bf7
|
364 |
strncpy(rhash.type, "shash", sizeof(rhash.type)); |
f4d663ce6
|
365 366 |
rhash.blocksize = alg->cra_blocksize; rhash.digestsize = salg->digestsize; |
6662df33f
|
367 368 369 |
if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(struct crypto_report_hash), &rhash)) goto nla_put_failure; |
f4d663ce6
|
370 371 372 373 374 |
return 0; nla_put_failure: return -EMSGSIZE; } |
3acc84739
|
375 376 377 378 379 380 |
#else static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg) { return -ENOSYS; } #endif |
f4d663ce6
|
381 |
|
7b5a080b3
|
382 |
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
d8c34b949
|
383 |
__maybe_unused; |
7b5a080b3
|
384 385 386 387 388 389 390 391 392 393 |
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) { struct shash_alg *salg = __crypto_shash_alg(alg); seq_printf(m, "type : shash "); seq_printf(m, "blocksize : %u ", alg->cra_blocksize); seq_printf(m, "digestsize : %u ", salg->digestsize); |
7b5a080b3
|
394 395 396 |
} static const struct crypto_type crypto_shash_type = { |
ac611680c
|
397 |
.extsize = crypto_alg_extsize, |
7b5a080b3
|
398 399 400 401 |
.init_tfm = crypto_shash_init_tfm, #ifdef CONFIG_PROC_FS .show = crypto_shash_show, #endif |
f4d663ce6
|
402 |
.report = crypto_shash_report, |
7b5a080b3
|
403 404 405 406 407 408 409 410 411 |
.maskclear = ~CRYPTO_ALG_TYPE_MASK, .maskset = CRYPTO_ALG_TYPE_MASK, .type = CRYPTO_ALG_TYPE_SHASH, .tfmsize = offsetof(struct crypto_shash, base), }; struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, u32 mask) { |
3f683d617
|
412 |
return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); |
7b5a080b3
|
413 414 |
} EXPORT_SYMBOL_GPL(crypto_alloc_shash); |
619a6ebd2
|
415 |
static int shash_prepare_alg(struct shash_alg *alg) |
7b5a080b3
|
416 417 418 419 |
{ struct crypto_alg *base = &alg->base; if (alg->digestsize > PAGE_SIZE / 8 || |
99d27e1c5
|
420 421 |
alg->descsize > PAGE_SIZE / 8 || alg->statesize > PAGE_SIZE / 8) |
7b5a080b3
|
422 423 424 425 426 |
return -EINVAL; base->cra_type = &crypto_shash_type; base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; |
99d27e1c5
|
427 |
|
8267adab9
|
428 429 430 431 |
if (!alg->finup) alg->finup = shash_finup_unaligned; if (!alg->digest) alg->digest = shash_digest_unaligned; |
f592682f9
|
432 433 434 435 436 |
if (!alg->export) { alg->export = shash_default_export; alg->import = shash_default_import; alg->statesize = alg->descsize; } |
57cfe44bc
|
437 438 |
if (!alg->setkey) alg->setkey = shash_no_setkey; |
99d27e1c5
|
439 |
|
619a6ebd2
|
440 441 442 443 444 445 446 447 448 449 450 |
return 0; } int crypto_register_shash(struct shash_alg *alg) { struct crypto_alg *base = &alg->base; int err; err = shash_prepare_alg(alg); if (err) return err; |
7b5a080b3
|
451 452 453 454 455 456 457 458 459 460 |
return crypto_register_alg(base); } EXPORT_SYMBOL_GPL(crypto_register_shash); int crypto_unregister_shash(struct shash_alg *alg) { return crypto_unregister_alg(&alg->base); } EXPORT_SYMBOL_GPL(crypto_unregister_shash); |
50fc3e8d2
|
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
int crypto_register_shashes(struct shash_alg *algs, int count) { int i, ret; for (i = 0; i < count; i++) { ret = crypto_register_shash(&algs[i]); if (ret) goto err; } return 0; err: for (--i; i >= 0; --i) crypto_unregister_shash(&algs[i]); return ret; } EXPORT_SYMBOL_GPL(crypto_register_shashes); int crypto_unregister_shashes(struct shash_alg *algs, int count) { int i, ret; for (i = count - 1; i >= 0; --i) { ret = crypto_unregister_shash(&algs[i]); if (ret) pr_err("Failed to unregister %s %s: %d ", algs[i].base.cra_driver_name, algs[i].base.cra_name, ret); } return 0; } EXPORT_SYMBOL_GPL(crypto_unregister_shashes); |
619a6ebd2
|
497 498 499 500 501 502 503 504 505 506 507 508 |
int shash_register_instance(struct crypto_template *tmpl, struct shash_instance *inst) { int err; err = shash_prepare_alg(&inst->alg); if (err) return err; return crypto_register_instance(tmpl, shash_crypto_instance(inst)); } EXPORT_SYMBOL_GPL(shash_register_instance); |
2e4fddd8e
|
509 510 511 512 513 514 |
void shash_free_instance(struct crypto_instance *inst) { crypto_drop_spawn(crypto_instance_ctx(inst)); kfree(shash_instance(inst)); } EXPORT_SYMBOL_GPL(shash_free_instance); |
942969992
|
515 516 517 518 519 520 521 522 |
int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn, struct shash_alg *alg, struct crypto_instance *inst) { return crypto_init_spawn2(&spawn->base, &alg->base, inst, &crypto_shash_type); } EXPORT_SYMBOL_GPL(crypto_init_shash_spawn); |
7d6f56400
|
523 524 525 526 527 528 529 530 531 |
struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask) { struct crypto_alg *alg; alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask); return IS_ERR(alg) ? ERR_CAST(alg) : container_of(alg, struct shash_alg, base); } EXPORT_SYMBOL_GPL(shash_attr_alg); |
7b5a080b3
|
532 533 |
MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |