| 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/slab.h> |
| 14 | #include <linux/seq_file.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <net/netlink.h> |
| 17 | |
| 18 | #include "hash.h" |
| 19 | |
| 20 | #define MAX_SHASH_ALIGNMASK 63 |
| 21 | |
| 22 | static const struct crypto_type crypto_shash_type; |
| 23 | |
| 24 | static inline struct crypto_istat_hash *shash_get_stat(struct shash_alg *alg) |
| 25 | { |
| 26 | return hash_get_stat(&alg->halg); |
| 27 | } |
| 28 | |
| 29 | static inline int crypto_shash_errstat(struct shash_alg *alg, int err) |
| 30 | { |
| 31 | return crypto_hash_errstat(&alg->halg, err); |
| 32 | } |
| 33 | |
| 34 | int shash_no_setkey(struct crypto_shash *tfm, const u8 *key, |
| 35 | unsigned int keylen) |
| 36 | { |
| 37 | return -ENOSYS; |
| 38 | } |
| 39 | EXPORT_SYMBOL_GPL(shash_no_setkey); |
| 40 | |
| 41 | static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, |
| 42 | unsigned int keylen) |
| 43 | { |
| 44 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 45 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 46 | unsigned long absize; |
| 47 | u8 *buffer, *alignbuffer; |
| 48 | int err; |
| 49 | |
| 50 | absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
| 51 | buffer = kmalloc(absize, GFP_ATOMIC); |
| 52 | if (!buffer) |
| 53 | return -ENOMEM; |
| 54 | |
| 55 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
| 56 | memcpy(alignbuffer, key, keylen); |
| 57 | err = shash->setkey(tfm, alignbuffer, keylen); |
| 58 | kfree_sensitive(buffer); |
| 59 | return err; |
| 60 | } |
| 61 | |
| 62 | static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg) |
| 63 | { |
| 64 | if (crypto_shash_alg_needs_key(alg)) |
| 65 | crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY); |
| 66 | } |
| 67 | |
| 68 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, |
| 69 | unsigned int keylen) |
| 70 | { |
| 71 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 72 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 73 | int err; |
| 74 | |
| 75 | if ((unsigned long)key & alignmask) |
| 76 | err = shash_setkey_unaligned(tfm, key, keylen); |
| 77 | else |
| 78 | err = shash->setkey(tfm, key, keylen); |
| 79 | |
| 80 | if (unlikely(err)) { |
| 81 | shash_set_needkey(tfm, shash); |
| 82 | return err; |
| 83 | } |
| 84 | |
| 85 | crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
| 86 | return 0; |
| 87 | } |
| 88 | EXPORT_SYMBOL_GPL(crypto_shash_setkey); |
| 89 | |
| 90 | static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, |
| 91 | unsigned int len) |
| 92 | { |
| 93 | struct crypto_shash *tfm = desc->tfm; |
| 94 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 95 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 96 | unsigned int unaligned_len = alignmask + 1 - |
| 97 | ((unsigned long)data & alignmask); |
| 98 | /* |
| 99 | * We cannot count on __aligned() working for large values: |
| 100 | * https://patchwork.kernel.org/patch/9507697/ |
| 101 | */ |
| 102 | u8 ubuf[MAX_SHASH_ALIGNMASK * 2]; |
| 103 | u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); |
| 104 | int err; |
| 105 | |
| 106 | if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf))) |
| 107 | return -EINVAL; |
| 108 | |
| 109 | if (unaligned_len > len) |
| 110 | unaligned_len = len; |
| 111 | |
| 112 | memcpy(buf, data, unaligned_len); |
| 113 | err = shash->update(desc, buf, unaligned_len); |
| 114 | memset(buf, 0, unaligned_len); |
| 115 | |
| 116 | return err ?: |
| 117 | shash->update(desc, data + unaligned_len, len - unaligned_len); |
| 118 | } |
| 119 | |
| 120 | int crypto_shash_update(struct shash_desc *desc, const u8 *data, |
| 121 | unsigned int len) |
| 122 | { |
| 123 | struct crypto_shash *tfm = desc->tfm; |
| 124 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 125 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 126 | int err; |
| 127 | |
| 128 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) |
| 129 | atomic64_add(len, &shash_get_stat(shash)->hash_tlen); |
| 130 | |
| 131 | if ((unsigned long)data & alignmask) |
| 132 | err = shash_update_unaligned(desc, data, len); |
| 133 | else |
| 134 | err = shash->update(desc, data, len); |
| 135 | |
| 136 | return crypto_shash_errstat(shash, err); |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(crypto_shash_update); |
| 139 | |
| 140 | static int shash_final_unaligned(struct shash_desc *desc, u8 *out) |
| 141 | { |
| 142 | struct crypto_shash *tfm = desc->tfm; |
| 143 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 144 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 145 | unsigned int ds = crypto_shash_digestsize(tfm); |
| 146 | /* |
| 147 | * We cannot count on __aligned() working for large values: |
| 148 | * https://patchwork.kernel.org/patch/9507697/ |
| 149 | */ |
| 150 | u8 ubuf[MAX_SHASH_ALIGNMASK + HASH_MAX_DIGESTSIZE]; |
| 151 | u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); |
| 152 | int err; |
| 153 | |
| 154 | if (WARN_ON(buf + ds > ubuf + sizeof(ubuf))) |
| 155 | return -EINVAL; |
| 156 | |
| 157 | err = shash->final(desc, buf); |
| 158 | if (err) |
| 159 | goto out; |
| 160 | |
| 161 | memcpy(out, buf, ds); |
| 162 | |
| 163 | out: |
| 164 | memset(buf, 0, ds); |
| 165 | return err; |
| 166 | } |
| 167 | |
| 168 | int crypto_shash_final(struct shash_desc *desc, u8 *out) |
| 169 | { |
| 170 | struct crypto_shash *tfm = desc->tfm; |
| 171 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 172 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 173 | int err; |
| 174 | |
| 175 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) |
| 176 | atomic64_inc(&shash_get_stat(shash)->hash_cnt); |
| 177 | |
| 178 | if ((unsigned long)out & alignmask) |
| 179 | err = shash_final_unaligned(desc, out); |
| 180 | else |
| 181 | err = shash->final(desc, out); |
| 182 | |
| 183 | return crypto_shash_errstat(shash, err); |
| 184 | } |
| 185 | EXPORT_SYMBOL_GPL(crypto_shash_final); |
| 186 | |
| 187 | static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data, |
| 188 | unsigned int len, u8 *out) |
| 189 | { |
| 190 | return shash_update_unaligned(desc, data, len) ?: |
| 191 | shash_final_unaligned(desc, out); |
| 192 | } |
| 193 | |
| 194 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data, |
| 195 | unsigned int len, u8 *out) |
| 196 | { |
| 197 | struct crypto_shash *tfm = desc->tfm; |
| 198 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 199 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 200 | int err; |
| 201 | |
| 202 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { |
| 203 | struct crypto_istat_hash *istat = shash_get_stat(shash); |
| 204 | |
| 205 | atomic64_inc(&istat->hash_cnt); |
| 206 | atomic64_add(len, &istat->hash_tlen); |
| 207 | } |
| 208 | |
| 209 | if (((unsigned long)data | (unsigned long)out) & alignmask) |
| 210 | err = shash_finup_unaligned(desc, data, len, out); |
| 211 | else |
| 212 | err = shash->finup(desc, data, len, out); |
| 213 | |
| 214 | |
| 215 | return crypto_shash_errstat(shash, err); |
| 216 | } |
| 217 | EXPORT_SYMBOL_GPL(crypto_shash_finup); |
| 218 | |
| 219 | static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data, |
| 220 | unsigned int len, u8 *out) |
| 221 | { |
| 222 | return crypto_shash_init(desc) ?: |
| 223 | shash_update_unaligned(desc, data, len) ?: |
| 224 | shash_final_unaligned(desc, out); |
| 225 | } |
| 226 | |
| 227 | int crypto_shash_digest(struct shash_desc *desc, const u8 *data, |
| 228 | unsigned int len, u8 *out) |
| 229 | { |
| 230 | struct crypto_shash *tfm = desc->tfm; |
| 231 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 232 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 233 | int err; |
| 234 | |
| 235 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { |
| 236 | struct crypto_istat_hash *istat = shash_get_stat(shash); |
| 237 | |
| 238 | atomic64_inc(&istat->hash_cnt); |
| 239 | atomic64_add(len, &istat->hash_tlen); |
| 240 | } |
| 241 | |
| 242 | if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
| 243 | err = -ENOKEY; |
| 244 | else if (((unsigned long)data | (unsigned long)out) & alignmask) |
| 245 | err = shash_digest_unaligned(desc, data, len, out); |
| 246 | else |
| 247 | err = shash->digest(desc, data, len, out); |
| 248 | |
| 249 | return crypto_shash_errstat(shash, err); |
| 250 | } |
| 251 | EXPORT_SYMBOL_GPL(crypto_shash_digest); |
| 252 | |
| 253 | int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data, |
| 254 | unsigned int len, u8 *out) |
| 255 | { |
| 256 | SHASH_DESC_ON_STACK(desc, tfm); |
| 257 | int err; |
| 258 | |
| 259 | desc->tfm = tfm; |
| 260 | |
| 261 | err = crypto_shash_digest(desc, data, len, out); |
| 262 | |
| 263 | shash_desc_zero(desc); |
| 264 | |
| 265 | return err; |
| 266 | } |
| 267 | EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest); |
| 268 | |
| 269 | static int shash_default_export(struct shash_desc *desc, void *out) |
| 270 | { |
| 271 | memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm)); |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static int shash_default_import(struct shash_desc *desc, const void *in) |
| 276 | { |
| 277 | memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm)); |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, |
| 282 | unsigned int keylen) |
| 283 | { |
| 284 | struct crypto_shash **ctx = crypto_ahash_ctx(tfm); |
| 285 | |
| 286 | return crypto_shash_setkey(*ctx, key, keylen); |
| 287 | } |
| 288 | |
| 289 | static int shash_async_init(struct ahash_request *req) |
| 290 | { |
| 291 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
| 292 | struct shash_desc *desc = ahash_request_ctx(req); |
| 293 | |
| 294 | desc->tfm = *ctx; |
| 295 | |
| 296 | return crypto_shash_init(desc); |
| 297 | } |
| 298 | |
| 299 | int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc) |
| 300 | { |
| 301 | struct crypto_hash_walk walk; |
| 302 | int nbytes; |
| 303 | |
| 304 | for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; |
| 305 | nbytes = crypto_hash_walk_done(&walk, nbytes)) |
| 306 | nbytes = crypto_shash_update(desc, walk.data, nbytes); |
| 307 | |
| 308 | return nbytes; |
| 309 | } |
| 310 | EXPORT_SYMBOL_GPL(shash_ahash_update); |
| 311 | |
| 312 | static int shash_async_update(struct ahash_request *req) |
| 313 | { |
| 314 | return shash_ahash_update(req, ahash_request_ctx(req)); |
| 315 | } |
| 316 | |
| 317 | static int shash_async_final(struct ahash_request *req) |
| 318 | { |
| 319 | return crypto_shash_final(ahash_request_ctx(req), req->result); |
| 320 | } |
| 321 | |
| 322 | int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc) |
| 323 | { |
| 324 | struct crypto_hash_walk walk; |
| 325 | int nbytes; |
| 326 | |
| 327 | nbytes = crypto_hash_walk_first(req, &walk); |
| 328 | if (!nbytes) |
| 329 | return crypto_shash_final(desc, req->result); |
| 330 | |
| 331 | do { |
| 332 | nbytes = crypto_hash_walk_last(&walk) ? |
| 333 | crypto_shash_finup(desc, walk.data, nbytes, |
| 334 | req->result) : |
| 335 | crypto_shash_update(desc, walk.data, nbytes); |
| 336 | nbytes = crypto_hash_walk_done(&walk, nbytes); |
| 337 | } while (nbytes > 0); |
| 338 | |
| 339 | return nbytes; |
| 340 | } |
| 341 | EXPORT_SYMBOL_GPL(shash_ahash_finup); |
| 342 | |
| 343 | static int shash_async_finup(struct ahash_request *req) |
| 344 | { |
| 345 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
| 346 | struct shash_desc *desc = ahash_request_ctx(req); |
| 347 | |
| 348 | desc->tfm = *ctx; |
| 349 | |
| 350 | return shash_ahash_finup(req, desc); |
| 351 | } |
| 352 | |
| 353 | int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) |
| 354 | { |
| 355 | unsigned int nbytes = req->nbytes; |
| 356 | struct scatterlist *sg; |
| 357 | unsigned int offset; |
| 358 | int err; |
| 359 | |
| 360 | if (nbytes && |
| 361 | (sg = req->src, offset = sg->offset, |
| 362 | nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) { |
| 363 | void *data; |
| 364 | |
| 365 | data = kmap_local_page(sg_page(sg)); |
| 366 | err = crypto_shash_digest(desc, data + offset, nbytes, |
| 367 | req->result); |
| 368 | kunmap_local(data); |
| 369 | } else |
| 370 | err = crypto_shash_init(desc) ?: |
| 371 | shash_ahash_finup(req, desc); |
| 372 | |
| 373 | return err; |
| 374 | } |
| 375 | EXPORT_SYMBOL_GPL(shash_ahash_digest); |
| 376 | |
| 377 | static int shash_async_digest(struct ahash_request *req) |
| 378 | { |
| 379 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
| 380 | struct shash_desc *desc = ahash_request_ctx(req); |
| 381 | |
| 382 | desc->tfm = *ctx; |
| 383 | |
| 384 | return shash_ahash_digest(req, desc); |
| 385 | } |
| 386 | |
| 387 | static int shash_async_export(struct ahash_request *req, void *out) |
| 388 | { |
| 389 | return crypto_shash_export(ahash_request_ctx(req), out); |
| 390 | } |
| 391 | |
| 392 | static int shash_async_import(struct ahash_request *req, const void *in) |
| 393 | { |
| 394 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
| 395 | struct shash_desc *desc = ahash_request_ctx(req); |
| 396 | |
| 397 | desc->tfm = *ctx; |
| 398 | |
| 399 | return crypto_shash_import(desc, in); |
| 400 | } |
| 401 | |
| 402 | static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) |
| 403 | { |
| 404 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); |
| 405 | |
| 406 | crypto_free_shash(*ctx); |
| 407 | } |
| 408 | |
| 409 | int crypto_init_shash_ops_async(struct crypto_tfm *tfm) |
| 410 | { |
| 411 | struct crypto_alg *calg = tfm->__crt_alg; |
| 412 | struct shash_alg *alg = __crypto_shash_alg(calg); |
| 413 | struct crypto_ahash *crt = __crypto_ahash_cast(tfm); |
| 414 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); |
| 415 | struct crypto_shash *shash; |
| 416 | |
| 417 | if (!crypto_mod_get(calg)) |
| 418 | return -EAGAIN; |
| 419 | |
| 420 | shash = crypto_create_tfm(calg, &crypto_shash_type); |
| 421 | if (IS_ERR(shash)) { |
| 422 | crypto_mod_put(calg); |
| 423 | return PTR_ERR(shash); |
| 424 | } |
| 425 | |
| 426 | *ctx = shash; |
| 427 | tfm->exit = crypto_exit_shash_ops_async; |
| 428 | |
| 429 | crt->init = shash_async_init; |
| 430 | crt->update = shash_async_update; |
| 431 | crt->final = shash_async_final; |
| 432 | crt->finup = shash_async_finup; |
| 433 | crt->digest = shash_async_digest; |
| 434 | if (crypto_shash_alg_has_setkey(alg)) |
| 435 | crt->setkey = shash_async_setkey; |
| 436 | |
| 437 | crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) & |
| 438 | CRYPTO_TFM_NEED_KEY); |
| 439 | |
| 440 | crt->export = shash_async_export; |
| 441 | crt->import = shash_async_import; |
| 442 | |
| 443 | crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); |
| 444 | |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | struct crypto_ahash *crypto_clone_shash_ops_async(struct crypto_ahash *nhash, |
| 449 | struct crypto_ahash *hash) |
| 450 | { |
| 451 | struct crypto_shash **nctx = crypto_ahash_ctx(nhash); |
| 452 | struct crypto_shash **ctx = crypto_ahash_ctx(hash); |
| 453 | struct crypto_shash *shash; |
| 454 | |
| 455 | shash = crypto_clone_shash(*ctx); |
| 456 | if (IS_ERR(shash)) { |
| 457 | crypto_free_ahash(nhash); |
| 458 | return ERR_CAST(shash); |
| 459 | } |
| 460 | |
| 461 | *nctx = shash; |
| 462 | |
| 463 | return nhash; |
| 464 | } |
| 465 | |
| 466 | static void crypto_shash_exit_tfm(struct crypto_tfm *tfm) |
| 467 | { |
| 468 | struct crypto_shash *hash = __crypto_shash_cast(tfm); |
| 469 | struct shash_alg *alg = crypto_shash_alg(hash); |
| 470 | |
| 471 | alg->exit_tfm(hash); |
| 472 | } |
| 473 | |
| 474 | static int crypto_shash_init_tfm(struct crypto_tfm *tfm) |
| 475 | { |
| 476 | struct crypto_shash *hash = __crypto_shash_cast(tfm); |
| 477 | struct shash_alg *alg = crypto_shash_alg(hash); |
| 478 | int err; |
| 479 | |
| 480 | hash->descsize = alg->descsize; |
| 481 | |
| 482 | shash_set_needkey(hash, alg); |
| 483 | |
| 484 | if (alg->exit_tfm) |
| 485 | tfm->exit = crypto_shash_exit_tfm; |
| 486 | |
| 487 | if (!alg->init_tfm) |
| 488 | return 0; |
| 489 | |
| 490 | err = alg->init_tfm(hash); |
| 491 | if (err) |
| 492 | return err; |
| 493 | |
| 494 | /* ->init_tfm() may have increased the descsize. */ |
| 495 | if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) { |
| 496 | if (alg->exit_tfm) |
| 497 | alg->exit_tfm(hash); |
| 498 | return -EINVAL; |
| 499 | } |
| 500 | |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | static void crypto_shash_free_instance(struct crypto_instance *inst) |
| 505 | { |
| 506 | struct shash_instance *shash = shash_instance(inst); |
| 507 | |
| 508 | shash->free(shash); |
| 509 | } |
| 510 | |
| 511 | static int __maybe_unused crypto_shash_report( |
| 512 | struct sk_buff *skb, struct crypto_alg *alg) |
| 513 | { |
| 514 | struct crypto_report_hash rhash; |
| 515 | struct shash_alg *salg = __crypto_shash_alg(alg); |
| 516 | |
| 517 | memset(&rhash, 0, sizeof(rhash)); |
| 518 | |
| 519 | strscpy(rhash.type, "shash", sizeof(rhash.type)); |
| 520 | |
| 521 | rhash.blocksize = alg->cra_blocksize; |
| 522 | rhash.digestsize = salg->digestsize; |
| 523 | |
| 524 | return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash); |
| 525 | } |
| 526 | |
| 527 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
| 528 | __maybe_unused; |
| 529 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
| 530 | { |
| 531 | struct shash_alg *salg = __crypto_shash_alg(alg); |
| 532 | |
| 533 | seq_printf(m, "type : shash\n"); |
| 534 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
| 535 | seq_printf(m, "digestsize : %u\n", salg->digestsize); |
| 536 | } |
| 537 | |
| 538 | static int __maybe_unused crypto_shash_report_stat( |
| 539 | struct sk_buff *skb, struct crypto_alg *alg) |
| 540 | { |
| 541 | return crypto_hash_report_stat(skb, alg, "shash"); |
| 542 | } |
| 543 | |
| 544 | static const struct crypto_type crypto_shash_type = { |
| 545 | .extsize = crypto_alg_extsize, |
| 546 | .init_tfm = crypto_shash_init_tfm, |
| 547 | .free = crypto_shash_free_instance, |
| 548 | #ifdef CONFIG_PROC_FS |
| 549 | .show = crypto_shash_show, |
| 550 | #endif |
| 551 | #if IS_ENABLED(CONFIG_CRYPTO_USER) |
| 552 | .report = crypto_shash_report, |
| 553 | #endif |
| 554 | #ifdef CONFIG_CRYPTO_STATS |
| 555 | .report_stat = crypto_shash_report_stat, |
| 556 | #endif |
| 557 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
| 558 | .maskset = CRYPTO_ALG_TYPE_MASK, |
| 559 | .type = CRYPTO_ALG_TYPE_SHASH, |
| 560 | .tfmsize = offsetof(struct crypto_shash, base), |
| 561 | }; |
| 562 | |
| 563 | int crypto_grab_shash(struct crypto_shash_spawn *spawn, |
| 564 | struct crypto_instance *inst, |
| 565 | const char *name, u32 type, u32 mask) |
| 566 | { |
| 567 | spawn->base.frontend = &crypto_shash_type; |
| 568 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); |
| 569 | } |
| 570 | EXPORT_SYMBOL_GPL(crypto_grab_shash); |
| 571 | |
| 572 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, |
| 573 | u32 mask) |
| 574 | { |
| 575 | return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); |
| 576 | } |
| 577 | EXPORT_SYMBOL_GPL(crypto_alloc_shash); |
| 578 | |
| 579 | int crypto_has_shash(const char *alg_name, u32 type, u32 mask) |
| 580 | { |
| 581 | return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask); |
| 582 | } |
| 583 | EXPORT_SYMBOL_GPL(crypto_has_shash); |
| 584 | |
| 585 | struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash) |
| 586 | { |
| 587 | struct crypto_tfm *tfm = crypto_shash_tfm(hash); |
| 588 | struct shash_alg *alg = crypto_shash_alg(hash); |
| 589 | struct crypto_shash *nhash; |
| 590 | int err; |
| 591 | |
| 592 | if (!crypto_shash_alg_has_setkey(alg)) { |
| 593 | tfm = crypto_tfm_get(tfm); |
| 594 | if (IS_ERR(tfm)) |
| 595 | return ERR_CAST(tfm); |
| 596 | |
| 597 | return hash; |
| 598 | } |
| 599 | |
| 600 | if (!alg->clone_tfm) |
| 601 | return ERR_PTR(-ENOSYS); |
| 602 | |
| 603 | nhash = crypto_clone_tfm(&crypto_shash_type, tfm); |
| 604 | if (IS_ERR(nhash)) |
| 605 | return nhash; |
| 606 | |
| 607 | nhash->descsize = hash->descsize; |
| 608 | |
| 609 | err = alg->clone_tfm(nhash, hash); |
| 610 | if (err) { |
| 611 | crypto_free_shash(nhash); |
| 612 | return ERR_PTR(err); |
| 613 | } |
| 614 | |
| 615 | return nhash; |
| 616 | } |
| 617 | EXPORT_SYMBOL_GPL(crypto_clone_shash); |
| 618 | |
| 619 | int hash_prepare_alg(struct hash_alg_common *alg) |
| 620 | { |
| 621 | struct crypto_istat_hash *istat = hash_get_stat(alg); |
| 622 | struct crypto_alg *base = &alg->base; |
| 623 | |
| 624 | if (alg->digestsize > HASH_MAX_DIGESTSIZE) |
| 625 | return -EINVAL; |
| 626 | |
| 627 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
| 628 | |
| 629 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) |
| 630 | memset(istat, 0, sizeof(*istat)); |
| 631 | |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | static int shash_prepare_alg(struct shash_alg *alg) |
| 636 | { |
| 637 | struct crypto_alg *base = &alg->halg.base; |
| 638 | int err; |
| 639 | |
| 640 | if (alg->descsize > HASH_MAX_DESCSIZE) |
| 641 | return -EINVAL; |
| 642 | |
| 643 | if (base->cra_alignmask > MAX_SHASH_ALIGNMASK) |
| 644 | return -EINVAL; |
| 645 | |
| 646 | if ((alg->export && !alg->import) || (alg->import && !alg->export)) |
| 647 | return -EINVAL; |
| 648 | |
| 649 | err = hash_prepare_alg(&alg->halg); |
| 650 | if (err) |
| 651 | return err; |
| 652 | |
| 653 | base->cra_type = &crypto_shash_type; |
| 654 | base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; |
| 655 | |
| 656 | if (!alg->finup) |
| 657 | alg->finup = shash_finup_unaligned; |
| 658 | if (!alg->digest) |
| 659 | alg->digest = shash_digest_unaligned; |
| 660 | if (!alg->export) { |
| 661 | alg->export = shash_default_export; |
| 662 | alg->import = shash_default_import; |
| 663 | alg->halg.statesize = alg->descsize; |
| 664 | } |
| 665 | if (!alg->setkey) |
| 666 | alg->setkey = shash_no_setkey; |
| 667 | |
| 668 | return 0; |
| 669 | } |
| 670 | |
| 671 | int crypto_register_shash(struct shash_alg *alg) |
| 672 | { |
| 673 | struct crypto_alg *base = &alg->base; |
| 674 | int err; |
| 675 | |
| 676 | err = shash_prepare_alg(alg); |
| 677 | if (err) |
| 678 | return err; |
| 679 | |
| 680 | return crypto_register_alg(base); |
| 681 | } |
| 682 | EXPORT_SYMBOL_GPL(crypto_register_shash); |
| 683 | |
| 684 | void crypto_unregister_shash(struct shash_alg *alg) |
| 685 | { |
| 686 | crypto_unregister_alg(&alg->base); |
| 687 | } |
| 688 | EXPORT_SYMBOL_GPL(crypto_unregister_shash); |
| 689 | |
| 690 | int crypto_register_shashes(struct shash_alg *algs, int count) |
| 691 | { |
| 692 | int i, ret; |
| 693 | |
| 694 | for (i = 0; i < count; i++) { |
| 695 | ret = crypto_register_shash(&algs[i]); |
| 696 | if (ret) |
| 697 | goto err; |
| 698 | } |
| 699 | |
| 700 | return 0; |
| 701 | |
| 702 | err: |
| 703 | for (--i; i >= 0; --i) |
| 704 | crypto_unregister_shash(&algs[i]); |
| 705 | |
| 706 | return ret; |
| 707 | } |
| 708 | EXPORT_SYMBOL_GPL(crypto_register_shashes); |
| 709 | |
| 710 | void crypto_unregister_shashes(struct shash_alg *algs, int count) |
| 711 | { |
| 712 | int i; |
| 713 | |
| 714 | for (i = count - 1; i >= 0; --i) |
| 715 | crypto_unregister_shash(&algs[i]); |
| 716 | } |
| 717 | EXPORT_SYMBOL_GPL(crypto_unregister_shashes); |
| 718 | |
| 719 | int shash_register_instance(struct crypto_template *tmpl, |
| 720 | struct shash_instance *inst) |
| 721 | { |
| 722 | int err; |
| 723 | |
| 724 | if (WARN_ON(!inst->free)) |
| 725 | return -EINVAL; |
| 726 | |
| 727 | err = shash_prepare_alg(&inst->alg); |
| 728 | if (err) |
| 729 | return err; |
| 730 | |
| 731 | return crypto_register_instance(tmpl, shash_crypto_instance(inst)); |
| 732 | } |
| 733 | EXPORT_SYMBOL_GPL(shash_register_instance); |
| 734 | |
| 735 | void shash_free_singlespawn_instance(struct shash_instance *inst) |
| 736 | { |
| 737 | crypto_drop_spawn(shash_instance_ctx(inst)); |
| 738 | kfree(inst); |
| 739 | } |
| 740 | EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance); |
| 741 | |
| 742 | MODULE_LICENSE("GPL"); |
| 743 | MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |