| 1 | /* |
| 2 | * Synchronous Cryptographic Hash operations. |
| 3 | * |
| 4 | * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the Free |
| 8 | * Software Foundation; either version 2 of the License, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <crypto/scatterwalk.h> |
| 14 | #include <crypto/internal/hash.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/seq_file.h> |
| 20 | |
| 21 | #include "internal.h" |
| 22 | |
| 23 | static const struct crypto_type crypto_shash_type; |
| 24 | |
| 25 | static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key, |
| 26 | unsigned int keylen) |
| 27 | { |
| 28 | return -ENOSYS; |
| 29 | } |
| 30 | |
| 31 | static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, |
| 32 | unsigned int keylen) |
| 33 | { |
| 34 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 35 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 36 | unsigned long absize; |
| 37 | u8 *buffer, *alignbuffer; |
| 38 | int err; |
| 39 | |
| 40 | absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1)); |
| 41 | buffer = kmalloc(absize, GFP_KERNEL); |
| 42 | if (!buffer) |
| 43 | return -ENOMEM; |
| 44 | |
| 45 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
| 46 | memcpy(alignbuffer, key, keylen); |
| 47 | err = shash->setkey(tfm, alignbuffer, keylen); |
| 48 | kzfree(buffer); |
| 49 | return err; |
| 50 | } |
| 51 | |
| 52 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, |
| 53 | unsigned int keylen) |
| 54 | { |
| 55 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 56 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 57 | |
| 58 | if ((unsigned long)key & alignmask) |
| 59 | return shash_setkey_unaligned(tfm, key, keylen); |
| 60 | |
| 61 | return shash->setkey(tfm, key, keylen); |
| 62 | } |
| 63 | EXPORT_SYMBOL_GPL(crypto_shash_setkey); |
| 64 | |
| 65 | static inline unsigned int shash_align_buffer_size(unsigned len, |
| 66 | unsigned long mask) |
| 67 | { |
| 68 | return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1)); |
| 69 | } |
| 70 | |
| 71 | static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, |
| 72 | unsigned int len) |
| 73 | { |
| 74 | struct crypto_shash *tfm = desc->tfm; |
| 75 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 76 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 77 | unsigned int unaligned_len = alignmask + 1 - |
| 78 | ((unsigned long)data & alignmask); |
| 79 | u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)] |
| 80 | __attribute__ ((aligned)); |
| 81 | u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); |
| 82 | int err; |
| 83 | |
| 84 | if (unaligned_len > len) |
| 85 | unaligned_len = len; |
| 86 | |
| 87 | memcpy(buf, data, unaligned_len); |
| 88 | err = shash->update(desc, buf, unaligned_len); |
| 89 | memset(buf, 0, unaligned_len); |
| 90 | |
| 91 | return err ?: |
| 92 | shash->update(desc, data + unaligned_len, len - unaligned_len); |
| 93 | } |
| 94 | |
| 95 | int crypto_shash_update(struct shash_desc *desc, const u8 *data, |
| 96 | unsigned int len) |
| 97 | { |
| 98 | struct crypto_shash *tfm = desc->tfm; |
| 99 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 100 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 101 | |
| 102 | if ((unsigned long)data & alignmask) |
| 103 | return shash_update_unaligned(desc, data, len); |
| 104 | |
| 105 | return shash->update(desc, data, len); |
| 106 | } |
| 107 | EXPORT_SYMBOL_GPL(crypto_shash_update); |
| 108 | |
| 109 | static int shash_final_unaligned(struct shash_desc *desc, u8 *out) |
| 110 | { |
| 111 | struct crypto_shash *tfm = desc->tfm; |
| 112 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 113 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 114 | unsigned int ds = crypto_shash_digestsize(tfm); |
| 115 | u8 ubuf[shash_align_buffer_size(ds, alignmask)] |
| 116 | __attribute__ ((aligned)); |
| 117 | u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); |
| 118 | int err; |
| 119 | |
| 120 | err = shash->final(desc, buf); |
| 121 | if (err) |
| 122 | goto out; |
| 123 | |
| 124 | memcpy(out, buf, ds); |
| 125 | |
| 126 | out: |
| 127 | memset(buf, 0, ds); |
| 128 | return err; |
| 129 | } |
| 130 | |
| 131 | int crypto_shash_final(struct shash_desc *desc, u8 *out) |
| 132 | { |
| 133 | struct crypto_shash *tfm = desc->tfm; |
| 134 | struct shash_alg *shash = crypto_shash_alg(tfm); |
| 135 | unsigned long alignmask = crypto_shash_alignmask(tfm); |
| 136 | |
| 137 | if ((unsigned long)out & alignmask) |
| 138 | return shash_final_unaligned(desc, out); |
| 139 | |
| 140 | return shash->final(desc, out); |
| 141 | } |
| 142 | EXPORT_SYMBOL_GPL(crypto_shash_final); |
| 143 | |
| 144 | static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data, |
| 145 | unsigned int len, u8 *out) |
| 146 | { |
| 147 | return crypto_shash_update(desc, data, len) ?: |
| 148 | crypto_shash_final(desc, out); |
| 149 | } |
| 150 | |
| 151 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data, |
| 152 | unsigned int len, 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)data | (unsigned long)out) & alignmask) |
| 159 | return shash_finup_unaligned(desc, data, len, out); |
| 160 | |
| 161 | return shash->finup(desc, data, len, out); |
| 162 | } |
| 163 | EXPORT_SYMBOL_GPL(crypto_shash_finup); |
| 164 | |
| 165 | static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data, |
| 166 | unsigned int len, u8 *out) |
| 167 | { |
| 168 | return crypto_shash_init(desc) ?: |
| 169 | crypto_shash_finup(desc, data, len, out); |
| 170 | } |
| 171 | |
| 172 | int crypto_shash_digest(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_digest_unaligned(desc, data, len, out); |
| 181 | |
| 182 | return shash->digest(desc, data, len, out); |
| 183 | } |
| 184 | EXPORT_SYMBOL_GPL(crypto_shash_digest); |
| 185 | |
| 186 | static int shash_no_export(struct shash_desc *desc, void *out) |
| 187 | { |
| 188 | return -ENOSYS; |
| 189 | } |
| 190 | |
| 191 | static int shash_no_import(struct shash_desc *desc, const void *in) |
| 192 | { |
| 193 | return -ENOSYS; |
| 194 | } |
| 195 | |
| 196 | static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, |
| 197 | unsigned int keylen) |
| 198 | { |
| 199 | struct crypto_shash **ctx = crypto_ahash_ctx(tfm); |
| 200 | |
| 201 | return crypto_shash_setkey(*ctx, key, keylen); |
| 202 | } |
| 203 | |
| 204 | static int shash_async_init(struct ahash_request *req) |
| 205 | { |
| 206 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
| 207 | struct shash_desc *desc = ahash_request_ctx(req); |
| 208 | |
| 209 | desc->tfm = *ctx; |
| 210 | desc->flags = req->base.flags; |
| 211 | |
| 212 | return crypto_shash_init(desc); |
| 213 | } |
| 214 | |
| 215 | int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc) |
| 216 | { |
| 217 | struct crypto_hash_walk walk; |
| 218 | int nbytes; |
| 219 | |
| 220 | for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; |
| 221 | nbytes = crypto_hash_walk_done(&walk, nbytes)) |
| 222 | nbytes = crypto_shash_update(desc, walk.data, nbytes); |
| 223 | |
| 224 | return nbytes; |
| 225 | } |
| 226 | EXPORT_SYMBOL_GPL(shash_ahash_update); |
| 227 | |
| 228 | static int shash_async_update(struct ahash_request *req) |
| 229 | { |
| 230 | return shash_ahash_update(req, ahash_request_ctx(req)); |
| 231 | } |
| 232 | |
| 233 | static int shash_async_final(struct ahash_request *req) |
| 234 | { |
| 235 | return crypto_shash_final(ahash_request_ctx(req), req->result); |
| 236 | } |
| 237 | |
| 238 | int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) |
| 239 | { |
| 240 | struct scatterlist *sg = req->src; |
| 241 | unsigned int offset = sg->offset; |
| 242 | unsigned int nbytes = req->nbytes; |
| 243 | int err; |
| 244 | |
| 245 | if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { |
| 246 | void *data; |
| 247 | |
| 248 | data = crypto_kmap(sg_page(sg), 0); |
| 249 | err = crypto_shash_digest(desc, data + offset, nbytes, |
| 250 | req->result); |
| 251 | crypto_kunmap(data, 0); |
| 252 | crypto_yield(desc->flags); |
| 253 | } else |
| 254 | err = crypto_shash_init(desc) ?: |
| 255 | shash_ahash_update(req, desc) ?: |
| 256 | crypto_shash_final(desc, req->result); |
| 257 | |
| 258 | return err; |
| 259 | } |
| 260 | EXPORT_SYMBOL_GPL(shash_ahash_digest); |
| 261 | |
| 262 | static int shash_async_digest(struct ahash_request *req) |
| 263 | { |
| 264 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
| 265 | struct shash_desc *desc = ahash_request_ctx(req); |
| 266 | |
| 267 | desc->tfm = *ctx; |
| 268 | desc->flags = req->base.flags; |
| 269 | |
| 270 | return shash_ahash_digest(req, desc); |
| 271 | } |
| 272 | |
| 273 | static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) |
| 274 | { |
| 275 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); |
| 276 | |
| 277 | crypto_free_shash(*ctx); |
| 278 | } |
| 279 | |
| 280 | int crypto_init_shash_ops_async(struct crypto_tfm *tfm) |
| 281 | { |
| 282 | struct crypto_alg *calg = tfm->__crt_alg; |
| 283 | struct crypto_ahash *crt = __crypto_ahash_cast(tfm); |
| 284 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); |
| 285 | struct crypto_shash *shash; |
| 286 | |
| 287 | if (!crypto_mod_get(calg)) |
| 288 | return -EAGAIN; |
| 289 | |
| 290 | shash = crypto_create_tfm(calg, &crypto_shash_type); |
| 291 | if (IS_ERR(shash)) { |
| 292 | crypto_mod_put(calg); |
| 293 | return PTR_ERR(shash); |
| 294 | } |
| 295 | |
| 296 | *ctx = shash; |
| 297 | tfm->exit = crypto_exit_shash_ops_async; |
| 298 | |
| 299 | crt->init = shash_async_init; |
| 300 | crt->update = shash_async_update; |
| 301 | crt->final = shash_async_final; |
| 302 | crt->digest = shash_async_digest; |
| 303 | crt->setkey = shash_async_setkey; |
| 304 | |
| 305 | crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); |
| 306 | |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key, |
| 311 | unsigned int keylen) |
| 312 | { |
| 313 | struct shash_desc **descp = crypto_hash_ctx(tfm); |
| 314 | struct shash_desc *desc = *descp; |
| 315 | |
| 316 | return crypto_shash_setkey(desc->tfm, key, keylen); |
| 317 | } |
| 318 | |
| 319 | static int shash_compat_init(struct hash_desc *hdesc) |
| 320 | { |
| 321 | struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm); |
| 322 | struct shash_desc *desc = *descp; |
| 323 | |
| 324 | desc->flags = hdesc->flags; |
| 325 | |
| 326 | return crypto_shash_init(desc); |
| 327 | } |
| 328 | |
| 329 | static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg, |
| 330 | unsigned int len) |
| 331 | { |
| 332 | struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm); |
| 333 | struct shash_desc *desc = *descp; |
| 334 | struct crypto_hash_walk walk; |
| 335 | int nbytes; |
| 336 | |
| 337 | for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len); |
| 338 | nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes)) |
| 339 | nbytes = crypto_shash_update(desc, walk.data, nbytes); |
| 340 | |
| 341 | return nbytes; |
| 342 | } |
| 343 | |
| 344 | static int shash_compat_final(struct hash_desc *hdesc, u8 *out) |
| 345 | { |
| 346 | struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm); |
| 347 | |
| 348 | return crypto_shash_final(*descp, out); |
| 349 | } |
| 350 | |
| 351 | static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg, |
| 352 | unsigned int nbytes, u8 *out) |
| 353 | { |
| 354 | unsigned int offset = sg->offset; |
| 355 | int err; |
| 356 | |
| 357 | if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { |
| 358 | struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm); |
| 359 | struct shash_desc *desc = *descp; |
| 360 | void *data; |
| 361 | |
| 362 | desc->flags = hdesc->flags; |
| 363 | |
| 364 | data = crypto_kmap(sg_page(sg), 0); |
| 365 | err = crypto_shash_digest(desc, data + offset, nbytes, out); |
| 366 | crypto_kunmap(data, 0); |
| 367 | crypto_yield(desc->flags); |
| 368 | goto out; |
| 369 | } |
| 370 | |
| 371 | err = shash_compat_init(hdesc); |
| 372 | if (err) |
| 373 | goto out; |
| 374 | |
| 375 | err = shash_compat_update(hdesc, sg, nbytes); |
| 376 | if (err) |
| 377 | goto out; |
| 378 | |
| 379 | err = shash_compat_final(hdesc, out); |
| 380 | |
| 381 | out: |
| 382 | return err; |
| 383 | } |
| 384 | |
| 385 | static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm) |
| 386 | { |
| 387 | struct shash_desc **descp = crypto_tfm_ctx(tfm); |
| 388 | struct shash_desc *desc = *descp; |
| 389 | |
| 390 | crypto_free_shash(desc->tfm); |
| 391 | kzfree(desc); |
| 392 | } |
| 393 | |
| 394 | static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm) |
| 395 | { |
| 396 | struct hash_tfm *crt = &tfm->crt_hash; |
| 397 | struct crypto_alg *calg = tfm->__crt_alg; |
| 398 | struct shash_alg *alg = __crypto_shash_alg(calg); |
| 399 | struct shash_desc **descp = crypto_tfm_ctx(tfm); |
| 400 | struct crypto_shash *shash; |
| 401 | struct shash_desc *desc; |
| 402 | |
| 403 | if (!crypto_mod_get(calg)) |
| 404 | return -EAGAIN; |
| 405 | |
| 406 | shash = crypto_create_tfm(calg, &crypto_shash_type); |
| 407 | if (IS_ERR(shash)) { |
| 408 | crypto_mod_put(calg); |
| 409 | return PTR_ERR(shash); |
| 410 | } |
| 411 | |
| 412 | desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash), |
| 413 | GFP_KERNEL); |
| 414 | if (!desc) { |
| 415 | crypto_free_shash(shash); |
| 416 | return -ENOMEM; |
| 417 | } |
| 418 | |
| 419 | *descp = desc; |
| 420 | desc->tfm = shash; |
| 421 | tfm->exit = crypto_exit_shash_ops_compat; |
| 422 | |
| 423 | crt->init = shash_compat_init; |
| 424 | crt->update = shash_compat_update; |
| 425 | crt->final = shash_compat_final; |
| 426 | crt->digest = shash_compat_digest; |
| 427 | crt->setkey = shash_compat_setkey; |
| 428 | |
| 429 | crt->digestsize = alg->digestsize; |
| 430 | |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
| 435 | { |
| 436 | switch (mask & CRYPTO_ALG_TYPE_MASK) { |
| 437 | case CRYPTO_ALG_TYPE_HASH_MASK: |
| 438 | return crypto_init_shash_ops_compat(tfm); |
| 439 | } |
| 440 | |
| 441 | return -EINVAL; |
| 442 | } |
| 443 | |
| 444 | static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type, |
| 445 | u32 mask) |
| 446 | { |
| 447 | switch (mask & CRYPTO_ALG_TYPE_MASK) { |
| 448 | case CRYPTO_ALG_TYPE_HASH_MASK: |
| 449 | return sizeof(struct shash_desc *); |
| 450 | } |
| 451 | |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | static int crypto_shash_init_tfm(struct crypto_tfm *tfm) |
| 456 | { |
| 457 | struct crypto_shash *hash = __crypto_shash_cast(tfm); |
| 458 | |
| 459 | hash->descsize = crypto_shash_alg(hash)->descsize; |
| 460 | return 0; |
| 461 | } |
| 462 | |
| 463 | static unsigned int crypto_shash_extsize(struct crypto_alg *alg) |
| 464 | { |
| 465 | return alg->cra_ctxsize; |
| 466 | } |
| 467 | |
| 468 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
| 469 | __attribute__ ((unused)); |
| 470 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
| 471 | { |
| 472 | struct shash_alg *salg = __crypto_shash_alg(alg); |
| 473 | |
| 474 | seq_printf(m, "type : shash\n"); |
| 475 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
| 476 | seq_printf(m, "digestsize : %u\n", salg->digestsize); |
| 477 | } |
| 478 | |
| 479 | static const struct crypto_type crypto_shash_type = { |
| 480 | .ctxsize = crypto_shash_ctxsize, |
| 481 | .extsize = crypto_shash_extsize, |
| 482 | .init = crypto_init_shash_ops, |
| 483 | .init_tfm = crypto_shash_init_tfm, |
| 484 | #ifdef CONFIG_PROC_FS |
| 485 | .show = crypto_shash_show, |
| 486 | #endif |
| 487 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
| 488 | .maskset = CRYPTO_ALG_TYPE_MASK, |
| 489 | .type = CRYPTO_ALG_TYPE_SHASH, |
| 490 | .tfmsize = offsetof(struct crypto_shash, base), |
| 491 | }; |
| 492 | |
| 493 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, |
| 494 | u32 mask) |
| 495 | { |
| 496 | return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); |
| 497 | } |
| 498 | EXPORT_SYMBOL_GPL(crypto_alloc_shash); |
| 499 | |
| 500 | static int shash_prepare_alg(struct shash_alg *alg) |
| 501 | { |
| 502 | struct crypto_alg *base = &alg->base; |
| 503 | |
| 504 | if (alg->digestsize > PAGE_SIZE / 8 || |
| 505 | alg->descsize > PAGE_SIZE / 8 || |
| 506 | alg->statesize > PAGE_SIZE / 8) |
| 507 | return -EINVAL; |
| 508 | |
| 509 | base->cra_type = &crypto_shash_type; |
| 510 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
| 511 | base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; |
| 512 | |
| 513 | if (!alg->finup) |
| 514 | alg->finup = shash_finup_unaligned; |
| 515 | if (!alg->digest) |
| 516 | alg->digest = shash_digest_unaligned; |
| 517 | if (!alg->import) |
| 518 | alg->import = shash_no_import; |
| 519 | if (!alg->export) |
| 520 | alg->export = shash_no_export; |
| 521 | if (!alg->setkey) |
| 522 | alg->setkey = shash_no_setkey; |
| 523 | |
| 524 | return 0; |
| 525 | } |
| 526 | |
| 527 | int crypto_register_shash(struct shash_alg *alg) |
| 528 | { |
| 529 | struct crypto_alg *base = &alg->base; |
| 530 | int err; |
| 531 | |
| 532 | err = shash_prepare_alg(alg); |
| 533 | if (err) |
| 534 | return err; |
| 535 | |
| 536 | return crypto_register_alg(base); |
| 537 | } |
| 538 | EXPORT_SYMBOL_GPL(crypto_register_shash); |
| 539 | |
| 540 | int crypto_unregister_shash(struct shash_alg *alg) |
| 541 | { |
| 542 | return crypto_unregister_alg(&alg->base); |
| 543 | } |
| 544 | EXPORT_SYMBOL_GPL(crypto_unregister_shash); |
| 545 | |
| 546 | int shash_register_instance(struct crypto_template *tmpl, |
| 547 | struct shash_instance *inst) |
| 548 | { |
| 549 | int err; |
| 550 | |
| 551 | err = shash_prepare_alg(&inst->alg); |
| 552 | if (err) |
| 553 | return err; |
| 554 | |
| 555 | return crypto_register_instance(tmpl, shash_crypto_instance(inst)); |
| 556 | } |
| 557 | EXPORT_SYMBOL_GPL(shash_register_instance); |
| 558 | |
| 559 | void shash_free_instance(struct crypto_instance *inst) |
| 560 | { |
| 561 | crypto_drop_spawn(crypto_instance_ctx(inst)); |
| 562 | kfree(shash_instance(inst)); |
| 563 | } |
| 564 | EXPORT_SYMBOL_GPL(shash_free_instance); |
| 565 | |
| 566 | int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn, |
| 567 | struct shash_alg *alg, |
| 568 | struct crypto_instance *inst) |
| 569 | { |
| 570 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, |
| 571 | &crypto_shash_type); |
| 572 | } |
| 573 | EXPORT_SYMBOL_GPL(crypto_init_shash_spawn); |
| 574 | |
| 575 | struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
| 576 | { |
| 577 | struct crypto_alg *alg; |
| 578 | |
| 579 | alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask); |
| 580 | return IS_ERR(alg) ? ERR_CAST(alg) : |
| 581 | container_of(alg, struct shash_alg, base); |
| 582 | } |
| 583 | EXPORT_SYMBOL_GPL(shash_attr_alg); |
| 584 | |
| 585 | MODULE_LICENSE("GPL"); |
| 586 | MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |