crypto/shash.c

   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 #include <linux/cryptouser.h>
  21 #include <net/netlink.h>
  22
  23 #include "internal.h"
  24
  25 static const struct crypto_type crypto_shash_type;
  26
  27 static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
  28                            unsigned int keylen)
  29 {
  30         return -ENOSYS;
  31 }
  32
  33 static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
  34                                   unsigned int keylen)
  35 {
  36         struct shash_alg *shash = crypto_shash_alg(tfm);
  37         unsigned long alignmask = crypto_shash_alignmask(tfm);
  38         unsigned long absize;
  39         u8 *buffer, *alignbuffer;
  40         int err;
  41
  42         absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
  43         buffer = kmalloc(absize, GFP_KERNEL);
  44         if (!buffer)
  45                 return -ENOMEM;
  46
  47         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
  48         memcpy(alignbuffer, key, keylen);
  49         err = shash->setkey(tfm, alignbuffer, keylen);
  50         kzfree(buffer);
  51         return err;
  52 }
  53
  54 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
  55                         unsigned int keylen)
  56 {
  57         struct shash_alg *shash = crypto_shash_alg(tfm);
  58         unsigned long alignmask = crypto_shash_alignmask(tfm);
  59
  60         if ((unsigned long)key & alignmask)
  61                 return shash_setkey_unaligned(tfm, key, keylen);
  62
  63         return shash->setkey(tfm, key, keylen);
  64 }
  65 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
  66
  67 static inline unsigned int shash_align_buffer_size(unsigned len,
  68                                                    unsigned long mask)
  69 {
  70         return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
  71 }
  72
  73 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
  74                                   unsigned int len)
  75 {
  76         struct crypto_shash *tfm = desc->tfm;
  77         struct shash_alg *shash = crypto_shash_alg(tfm);
  78         unsigned long alignmask = crypto_shash_alignmask(tfm);
  79         unsigned int unaligned_len = alignmask + 1 -
  80                                      ((unsigned long)data & alignmask);
  81         u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
  82                 __attribute__ ((aligned));
  83         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
  84         int err;
  85
  86         if (unaligned_len > len)
  87                 unaligned_len = len;
  88
  89         memcpy(buf, data, unaligned_len);
  90         err = shash->update(desc, buf, unaligned_len);
  91         memset(buf, 0, unaligned_len);
  92
  93         return err ?:
  94                shash->update(desc, data + unaligned_len, len - unaligned_len);
  95 }
  96
  97 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
  98                         unsigned int len)
  99 {
 100         struct crypto_shash *tfm = desc->tfm;
 101         struct shash_alg *shash = crypto_shash_alg(tfm);
 102         unsigned long alignmask = crypto_shash_alignmask(tfm);
 103
 104         if ((unsigned long)data & alignmask)
 105                 return shash_update_unaligned(desc, data, len);
 106
 107         return shash->update(desc, data, len);
 108 }
 109 EXPORT_SYMBOL_GPL(crypto_shash_update);
 110
 111 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
 112 {
 113         struct crypto_shash *tfm = desc->tfm;
 114         unsigned long alignmask = crypto_shash_alignmask(tfm);
 115         struct shash_alg *shash = crypto_shash_alg(tfm);
 116         unsigned int ds = crypto_shash_digestsize(tfm);
 117         u8 ubuf[shash_align_buffer_size(ds, alignmask)]
 118                 __attribute__ ((aligned));
 119         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
 120         int err;
 121
 122         err = shash->final(desc, buf);
 123         if (err)
 124                 goto out;
 125
 126         memcpy(out, buf, ds);
 127
 128 out:
 129         memset(buf, 0, ds);
 130         return err;
 131 }
 132
 133 int crypto_shash_final(struct shash_desc *desc, u8 *out)
 134 {
 135         struct crypto_shash *tfm = desc->tfm;
 136         struct shash_alg *shash = crypto_shash_alg(tfm);
 137         unsigned long alignmask = crypto_shash_alignmask(tfm);
 138
 139         if ((unsigned long)out & alignmask)
 140                 return shash_final_unaligned(desc, out);
 141
 142         return shash->final(desc, out);
 143 }
 144 EXPORT_SYMBOL_GPL(crypto_shash_final);
 145
 146 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
 147                                  unsigned int len, u8 *out)
 148 {
 149         return crypto_shash_update(desc, data, len) ?:
 150                crypto_shash_final(desc, out);
 151 }
 152
 153 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
 154                        unsigned int len, u8 *out)
 155 {
 156         struct crypto_shash *tfm = desc->tfm;
 157         struct shash_alg *shash = crypto_shash_alg(tfm);
 158         unsigned long alignmask = crypto_shash_alignmask(tfm);
 159
 160         if (((unsigned long)data | (unsigned long)out) & alignmask)
 161                 return shash_finup_unaligned(desc, data, len, out);
 162
 163         return shash->finup(desc, data, len, out);
 164 }
 165 EXPORT_SYMBOL_GPL(crypto_shash_finup);
 166
 167 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
 168                                   unsigned int len, u8 *out)
 169 {
 170         return crypto_shash_init(desc) ?:
 171                crypto_shash_finup(desc, data, len, out);
 172 }
 173
 174 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
 175                         unsigned int len, u8 *out)
 176 {
 177         struct crypto_shash *tfm = desc->tfm;
 178         struct shash_alg *shash = crypto_shash_alg(tfm);
 179         unsigned long alignmask = crypto_shash_alignmask(tfm);
 180
 181         if (((unsigned long)data | (unsigned long)out) & alignmask)
 182                 return shash_digest_unaligned(desc, data, len, out);
 183
 184         return shash->digest(desc, data, len, out);
 185 }
 186 EXPORT_SYMBOL_GPL(crypto_shash_digest);
 187
 188 static int shash_default_export(struct shash_desc *desc, void *out)
 189 {
 190         memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
 191         return 0;
 192 }
 193
 194 static int shash_default_import(struct shash_desc *desc, const void *in)
 195 {
 196         memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
 197         return 0;
 198 }
 199
 200 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
 201                               unsigned int keylen)
 202 {
 203         struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
 204
 205         return crypto_shash_setkey(*ctx, key, keylen);
 206 }
 207
 208 static int shash_async_init(struct ahash_request *req)
 209 {
 210         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 211         struct shash_desc *desc = ahash_request_ctx(req);
 212
 213         desc->tfm = *ctx;
 214         desc->flags = req->base.flags;
 215
 216         return crypto_shash_init(desc);
 217 }
 218
 219 int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
 220 {
 221         struct crypto_hash_walk walk;
 222         int nbytes;
 223
 224         for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
 225              nbytes = crypto_hash_walk_done(&walk, nbytes))
 226                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
 227
 228         return nbytes;
 229 }
 230 EXPORT_SYMBOL_GPL(shash_ahash_update);
 231
 232 static int shash_async_update(struct ahash_request *req)
 233 {
 234         return shash_ahash_update(req, ahash_request_ctx(req));
 235 }
 236
 237 static int shash_async_final(struct ahash_request *req)
 238 {
 239         return crypto_shash_final(ahash_request_ctx(req), req->result);
 240 }
 241
 242 int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
 243 {
 244         struct crypto_hash_walk walk;
 245         int nbytes;
 246
 247         nbytes = crypto_hash_walk_first(req, &walk);
 248         if (!nbytes)
 249                 return crypto_shash_final(desc, req->result);
 250
 251         do {
 252                 nbytes = crypto_hash_walk_last(&walk) ?
 253                          crypto_shash_finup(desc, walk.data, nbytes,
 254                                             req->result) :
 255                          crypto_shash_update(desc, walk.data, nbytes);
 256                 nbytes = crypto_hash_walk_done(&walk, nbytes);
 257         } while (nbytes > 0);
 258
 259         return nbytes;
 260 }
 261 EXPORT_SYMBOL_GPL(shash_ahash_finup);
 262
 263 static int shash_async_finup(struct ahash_request *req)
 264 {
 265         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 266         struct shash_desc *desc = ahash_request_ctx(req);
 267
 268         desc->tfm = *ctx;
 269         desc->flags = req->base.flags;
 270
 271         return shash_ahash_finup(req, desc);
 272 }
 273
 274 int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
 275 {
 276         unsigned int nbytes = req->nbytes;
 277         struct scatterlist *sg;
 278         unsigned int offset;
 279         int err;
 280
 281         if (nbytes &&
 282             (sg = req->src, offset = sg->offset,
 283              nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
 284                 void *data;
 285
 286                 data = crypto_kmap(sg_page(sg), 0);
 287                 err = crypto_shash_digest(desc, data + offset, nbytes,
 288                                           req->result);
 289                 crypto_kunmap(data, 0);
 290                 crypto_yield(desc->flags);
 291         } else
 292                 err = crypto_shash_init(desc) ?:
 293                       shash_ahash_finup(req, desc);
 294
 295         return err;
 296 }
 297 EXPORT_SYMBOL_GPL(shash_ahash_digest);
 298
 299 static int shash_async_digest(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;
 305         desc->flags = req->base.flags;
 306
 307         return shash_ahash_digest(req, desc);
 308 }
 309
 310 static int shash_async_export(struct ahash_request *req, void *out)
 311 {
 312         return crypto_shash_export(ahash_request_ctx(req), out);
 313 }
 314
 315 static int shash_async_import(struct ahash_request *req, const void *in)
 316 {
 317         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 318         struct shash_desc *desc = ahash_request_ctx(req);
 319
 320         desc->tfm = *ctx;
 321         desc->flags = req->base.flags;
 322
 323         return crypto_shash_import(desc, in);
 324 }
 325
 326 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
 327 {
 328         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
 329
 330         crypto_free_shash(*ctx);
 331 }
 332
 333 int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
 334 {
 335         struct crypto_alg *calg = tfm->__crt_alg;
 336         struct shash_alg *alg = __crypto_shash_alg(calg);
 337         struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
 338         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
 339         struct crypto_shash *shash;
 340
 341         if (!crypto_mod_get(calg))
 342                 return -EAGAIN;
 343
 344         shash = crypto_create_tfm(calg, &crypto_shash_type);
 345         if (IS_ERR(shash)) {
 346                 crypto_mod_put(calg);
 347                 return PTR_ERR(shash);
 348         }
 349
 350         *ctx = shash;
 351         tfm->exit = crypto_exit_shash_ops_async;
 352
 353         crt->init = shash_async_init;
 354         crt->update = shash_async_update;
 355         crt->final = shash_async_final;
 356         crt->finup = shash_async_finup;
 357         crt->digest = shash_async_digest;
 358         crt->setkey = shash_async_setkey;
 359
 360         crt->has_setkey = alg->setkey != shash_no_setkey;
 361
 362         if (alg->export)
 363                 crt->export = shash_async_export;
 364         if (alg->import)
 365                 crt->import = shash_async_import;
 366
 367         crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
 368
 369         return 0;
 370 }
 371
 372 static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
 373                                unsigned int keylen)
 374 {
 375         struct shash_desc **descp = crypto_hash_ctx(tfm);
 376         struct shash_desc *desc = *descp;
 377
 378         return crypto_shash_setkey(desc->tfm, key, keylen);
 379 }
 380
 381 static int shash_compat_init(struct hash_desc *hdesc)
 382 {
 383         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 384         struct shash_desc *desc = *descp;
 385
 386         desc->flags = hdesc->flags;
 387
 388         return crypto_shash_init(desc);
 389 }
 390
 391 static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
 392                                unsigned int len)
 393 {
 394         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 395         struct shash_desc *desc = *descp;
 396         struct crypto_hash_walk walk;
 397         int nbytes;
 398
 399         for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
 400              nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
 401                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
 402
 403         return nbytes;
 404 }
 405
 406 static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
 407 {
 408         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 409
 410         return crypto_shash_final(*descp, out);
 411 }
 412
 413 static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
 414                                unsigned int nbytes, u8 *out)
 415 {
 416         unsigned int offset = sg->offset;
 417         int err;
 418
 419         if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
 420                 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 421                 struct shash_desc *desc = *descp;
 422                 void *data;
 423
 424                 desc->flags = hdesc->flags;
 425
 426                 data = crypto_kmap(sg_page(sg), 0);
 427                 err = crypto_shash_digest(desc, data + offset, nbytes, out);
 428                 crypto_kunmap(data, 0);
 429                 crypto_yield(desc->flags);
 430                 goto out;
 431         }
 432
 433         err = shash_compat_init(hdesc);
 434         if (err)
 435                 goto out;
 436
 437         err = shash_compat_update(hdesc, sg, nbytes);
 438         if (err)
 439                 goto out;
 440
 441         err = shash_compat_final(hdesc, out);
 442
 443 out:
 444         return err;
 445 }
 446
 447 static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
 448 {
 449         struct shash_desc **descp = crypto_tfm_ctx(tfm);
 450         struct shash_desc *desc = *descp;
 451
 452         crypto_free_shash(desc->tfm);
 453         kzfree(desc);
 454 }
 455
 456 static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
 457 {
 458         struct hash_tfm *crt = &tfm->crt_hash;
 459         struct crypto_alg *calg = tfm->__crt_alg;
 460         struct shash_alg *alg = __crypto_shash_alg(calg);
 461         struct shash_desc **descp = crypto_tfm_ctx(tfm);
 462         struct crypto_shash *shash;
 463         struct shash_desc *desc;
 464
 465         if (!crypto_mod_get(calg))
 466                 return -EAGAIN;
 467
 468         shash = crypto_create_tfm(calg, &crypto_shash_type);
 469         if (IS_ERR(shash)) {
 470                 crypto_mod_put(calg);
 471                 return PTR_ERR(shash);
 472         }
 473
 474         desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
 475                        GFP_KERNEL);
 476         if (!desc) {
 477                 crypto_free_shash(shash);
 478                 return -ENOMEM;
 479         }
 480
 481         *descp = desc;
 482         desc->tfm = shash;
 483         tfm->exit = crypto_exit_shash_ops_compat;
 484
 485         crt->init = shash_compat_init;
 486         crt->update = shash_compat_update;
 487         crt->final  = shash_compat_final;
 488         crt->digest = shash_compat_digest;
 489         crt->setkey = shash_compat_setkey;
 490
 491         crt->digestsize = alg->digestsize;
 492
 493         return 0;
 494 }
 495
 496 static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
 497 {
 498         switch (mask & CRYPTO_ALG_TYPE_MASK) {
 499         case CRYPTO_ALG_TYPE_HASH_MASK:
 500                 return crypto_init_shash_ops_compat(tfm);
 501         }
 502
 503         return -EINVAL;
 504 }
 505
 506 static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
 507                                          u32 mask)
 508 {
 509         switch (mask & CRYPTO_ALG_TYPE_MASK) {
 510         case CRYPTO_ALG_TYPE_HASH_MASK:
 511                 return sizeof(struct shash_desc *);
 512         }
 513
 514         return 0;
 515 }
 516
 517 static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
 518 {
 519         struct crypto_shash *hash = __crypto_shash_cast(tfm);
 520
 521         hash->descsize = crypto_shash_alg(hash)->descsize;
 522         return 0;
 523 }
 524
 525 static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
 526 {
 527         return alg->cra_ctxsize;
 528 }
 529
 530 #ifdef CONFIG_NET
 531 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
 532 {
 533         struct crypto_report_hash rhash;
 534         struct shash_alg *salg = __crypto_shash_alg(alg);
 535
 536         strncpy(rhash.type, "shash", sizeof(rhash.type));
 537
 538         rhash.blocksize = alg->cra_blocksize;
 539         rhash.digestsize = salg->digestsize;
 540
 541         NLA_PUT(skb, CRYPTOCFGA_REPORT_HASH,
 542                 sizeof(struct crypto_report_hash), &rhash);
 543
 544         return 0;
 545
 546 nla_put_failure:
 547         return -EMSGSIZE;
 548 }
 549 #else
 550 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
 551 {
 552         return -ENOSYS;
 553 }
 554 #endif
 555
 556 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
 557         __attribute__ ((unused));
 558 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
 559 {
 560         struct shash_alg *salg = __crypto_shash_alg(alg);
 561
 562         seq_printf(m, "type         : shash\n");
 563         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 564         seq_printf(m, "digestsize   : %u\n", salg->digestsize);
 565 }
 566
 567 static const struct crypto_type crypto_shash_type = {
 568         .ctxsize = crypto_shash_ctxsize,
 569         .extsize = crypto_shash_extsize,
 570         .init = crypto_init_shash_ops,
 571         .init_tfm = crypto_shash_init_tfm,
 572 #ifdef CONFIG_PROC_FS
 573         .show = crypto_shash_show,
 574 #endif
 575         .report = crypto_shash_report,
 576         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 577         .maskset = CRYPTO_ALG_TYPE_MASK,
 578         .type = CRYPTO_ALG_TYPE_SHASH,
 579         .tfmsize = offsetof(struct crypto_shash, base),
 580 };
 581
 582 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
 583                                         u32 mask)
 584 {
 585         return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
 586 }
 587 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
 588
 589 static int shash_prepare_alg(struct shash_alg *alg)
 590 {
 591         struct crypto_alg *base = &alg->base;
 592
 593         if (alg->digestsize > PAGE_SIZE / 8 ||
 594             alg->descsize > PAGE_SIZE / 8 ||
 595             alg->statesize > PAGE_SIZE / 8)
 596                 return -EINVAL;
 597
 598         base->cra_type = &crypto_shash_type;
 599         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 600         base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
 601
 602         if (!alg->finup)
 603                 alg->finup = shash_finup_unaligned;
 604         if (!alg->digest)
 605                 alg->digest = shash_digest_unaligned;
 606         if (!alg->export) {
 607                 alg->export = shash_default_export;
 608                 alg->import = shash_default_import;
 609                 alg->statesize = alg->descsize;
 610         }
 611         if (!alg->setkey)
 612                 alg->setkey = shash_no_setkey;
 613
 614         return 0;
 615 }
 616
 617 int crypto_register_shash(struct shash_alg *alg)
 618 {
 619         struct crypto_alg *base = &alg->base;
 620         int err;
 621
 622         err = shash_prepare_alg(alg);
 623         if (err)
 624                 return err;
 625
 626         return crypto_register_alg(base);
 627 }
 628 EXPORT_SYMBOL_GPL(crypto_register_shash);
 629
 630 int crypto_unregister_shash(struct shash_alg *alg)
 631 {
 632         return crypto_unregister_alg(&alg->base);
 633 }
 634 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
 635
 636 int shash_register_instance(struct crypto_template *tmpl,
 637                             struct shash_instance *inst)
 638 {
 639         int err;
 640
 641         err = shash_prepare_alg(&inst->alg);
 642         if (err)
 643                 return err;
 644
 645         return crypto_register_instance(tmpl, shash_crypto_instance(inst));
 646 }
 647 EXPORT_SYMBOL_GPL(shash_register_instance);
 648
 649 void shash_free_instance(struct crypto_instance *inst)
 650 {
 651         crypto_drop_spawn(crypto_instance_ctx(inst));
 652         kfree(shash_instance(inst));
 653 }
 654 EXPORT_SYMBOL_GPL(shash_free_instance);
 655
 656 int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
 657                             struct shash_alg *alg,
 658                             struct crypto_instance *inst)
 659 {
 660         return crypto_init_spawn2(&spawn->base, &alg->base, inst,
 661                                   &crypto_shash_type);
 662 }
 663 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
 664
 665 struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
 666 {
 667         struct crypto_alg *alg;
 668
 669         alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
 670         return IS_ERR(alg) ? ERR_CAST(alg) :
 671                container_of(alg, struct shash_alg, base);
 672 }
 673 EXPORT_SYMBOL_GPL(shash_attr_alg);
 674
 675 MODULE_LICENSE("GPL");
 676 MODULE_DESCRIPTION("Synchronous cryptographic hash type");