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 int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
  28                     unsigned int keylen)
  29 {
  30         return -ENOSYS;
  31 }
  32 EXPORT_SYMBOL_GPL(shash_no_setkey);
  33
  34 static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
  35                                   unsigned int keylen)
  36 {
  37         struct shash_alg *shash = crypto_shash_alg(tfm);
  38         unsigned long alignmask = crypto_shash_alignmask(tfm);
  39         unsigned long absize;
  40         u8 *buffer, *alignbuffer;
  41         int err;
  42
  43         absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
  44         buffer = kmalloc(absize, GFP_KERNEL);
  45         if (!buffer)
  46                 return -ENOMEM;
  47
  48         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
  49         memcpy(alignbuffer, key, keylen);
  50         err = shash->setkey(tfm, alignbuffer, keylen);
  51         kzfree(buffer);
  52         return err;
  53 }
  54
  55 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
  56                         unsigned int keylen)
  57 {
  58         struct shash_alg *shash = crypto_shash_alg(tfm);
  59         unsigned long alignmask = crypto_shash_alignmask(tfm);
  60         int err;
  61
  62         if ((unsigned long)key & alignmask)
  63                 err = shash_setkey_unaligned(tfm, key, keylen);
  64         else
  65                 err = shash->setkey(tfm, key, keylen);
  66
  67         if (err)
  68                 return err;
  69
  70         crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
  71         return 0;
  72 }
  73 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
  74
  75 static inline unsigned int shash_align_buffer_size(unsigned len,
  76                                                    unsigned long mask)
  77 {
  78         return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
  79 }
  80
  81 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
  82                                   unsigned int len)
  83 {
  84         struct crypto_shash *tfm = desc->tfm;
  85         struct shash_alg *shash = crypto_shash_alg(tfm);
  86         unsigned long alignmask = crypto_shash_alignmask(tfm);
  87         unsigned int unaligned_len = alignmask + 1 -
  88                                      ((unsigned long)data & alignmask);
  89         u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
  90                 __attribute__ ((aligned));
  91         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
  92         int err;
  93
  94         if (unaligned_len > len)
  95                 unaligned_len = len;
  96
  97         memcpy(buf, data, unaligned_len);
  98         err = shash->update(desc, buf, unaligned_len);
  99         memset(buf, 0, unaligned_len);
 100
 101         return err ?:
 102                shash->update(desc, data + unaligned_len, len - unaligned_len);
 103 }
 104
 105 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
 106                         unsigned int len)
 107 {
 108         struct crypto_shash *tfm = desc->tfm;
 109         struct shash_alg *shash = crypto_shash_alg(tfm);
 110         unsigned long alignmask = crypto_shash_alignmask(tfm);
 111
 112         if ((unsigned long)data & alignmask)
 113                 return shash_update_unaligned(desc, data, len);
 114
 115         return shash->update(desc, data, len);
 116 }
 117 EXPORT_SYMBOL_GPL(crypto_shash_update);
 118
 119 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
 120 {
 121         struct crypto_shash *tfm = desc->tfm;
 122         unsigned long alignmask = crypto_shash_alignmask(tfm);
 123         struct shash_alg *shash = crypto_shash_alg(tfm);
 124         unsigned int ds = crypto_shash_digestsize(tfm);
 125         u8 ubuf[shash_align_buffer_size(ds, alignmask)]
 126                 __attribute__ ((aligned));
 127         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
 128         int err;
 129
 130         err = shash->final(desc, buf);
 131         if (err)
 132                 goto out;
 133
 134         memcpy(out, buf, ds);
 135
 136 out:
 137         memset(buf, 0, ds);
 138         return err;
 139 }
 140
 141 int crypto_shash_final(struct shash_desc *desc, u8 *out)
 142 {
 143         struct crypto_shash *tfm = desc->tfm;
 144         struct shash_alg *shash = crypto_shash_alg(tfm);
 145         unsigned long alignmask = crypto_shash_alignmask(tfm);
 146
 147         if ((unsigned long)out & alignmask)
 148                 return shash_final_unaligned(desc, out);
 149
 150         return shash->final(desc, out);
 151 }
 152 EXPORT_SYMBOL_GPL(crypto_shash_final);
 153
 154 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
 155                                  unsigned int len, u8 *out)
 156 {
 157         return crypto_shash_update(desc, data, len) ?:
 158                crypto_shash_final(desc, out);
 159 }
 160
 161 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
 162                        unsigned int len, u8 *out)
 163 {
 164         struct crypto_shash *tfm = desc->tfm;
 165         struct shash_alg *shash = crypto_shash_alg(tfm);
 166         unsigned long alignmask = crypto_shash_alignmask(tfm);
 167
 168         if (((unsigned long)data | (unsigned long)out) & alignmask)
 169                 return shash_finup_unaligned(desc, data, len, out);
 170
 171         return shash->finup(desc, data, len, out);
 172 }
 173 EXPORT_SYMBOL_GPL(crypto_shash_finup);
 174
 175 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
 176                                   unsigned int len, u8 *out)
 177 {
 178         return crypto_shash_init(desc) ?:
 179                crypto_shash_finup(desc, data, len, out);
 180 }
 181
 182 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
 183                         unsigned int len, u8 *out)
 184 {
 185         struct crypto_shash *tfm = desc->tfm;
 186         struct shash_alg *shash = crypto_shash_alg(tfm);
 187         unsigned long alignmask = crypto_shash_alignmask(tfm);
 188
 189         if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 190                 return -ENOKEY;
 191
 192         if (((unsigned long)data | (unsigned long)out) & alignmask)
 193                 return shash_digest_unaligned(desc, data, len, out);
 194
 195         return shash->digest(desc, data, len, out);
 196 }
 197 EXPORT_SYMBOL_GPL(crypto_shash_digest);
 198
 199 static int shash_default_export(struct shash_desc *desc, void *out)
 200 {
 201         memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
 202         return 0;
 203 }
 204
 205 static int shash_default_import(struct shash_desc *desc, const void *in)
 206 {
 207         memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
 208         return 0;
 209 }
 210
 211 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
 212                               unsigned int keylen)
 213 {
 214         struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
 215
 216         return crypto_shash_setkey(*ctx, key, keylen);
 217 }
 218
 219 static int shash_async_init(struct ahash_request *req)
 220 {
 221         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 222         struct shash_desc *desc = ahash_request_ctx(req);
 223
 224         desc->tfm = *ctx;
 225         desc->flags = req->base.flags;
 226
 227         return crypto_shash_init(desc);
 228 }
 229
 230 int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
 231 {
 232         struct crypto_hash_walk walk;
 233         int nbytes;
 234
 235         for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
 236              nbytes = crypto_hash_walk_done(&walk, nbytes))
 237                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
 238
 239         return nbytes;
 240 }
 241 EXPORT_SYMBOL_GPL(shash_ahash_update);
 242
 243 static int shash_async_update(struct ahash_request *req)
 244 {
 245         return shash_ahash_update(req, ahash_request_ctx(req));
 246 }
 247
 248 static int shash_async_final(struct ahash_request *req)
 249 {
 250         return crypto_shash_final(ahash_request_ctx(req), req->result);
 251 }
 252
 253 int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
 254 {
 255         struct crypto_hash_walk walk;
 256         int nbytes;
 257
 258         nbytes = crypto_hash_walk_first(req, &walk);
 259         if (!nbytes)
 260                 return crypto_shash_final(desc, req->result);
 261
 262         do {
 263                 nbytes = crypto_hash_walk_last(&walk) ?
 264                          crypto_shash_finup(desc, walk.data, nbytes,
 265                                             req->result) :
 266                          crypto_shash_update(desc, walk.data, nbytes);
 267                 nbytes = crypto_hash_walk_done(&walk, nbytes);
 268         } while (nbytes > 0);
 269
 270         return nbytes;
 271 }
 272 EXPORT_SYMBOL_GPL(shash_ahash_finup);
 273
 274 static int shash_async_finup(struct ahash_request *req)
 275 {
 276         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 277         struct shash_desc *desc = ahash_request_ctx(req);
 278
 279         desc->tfm = *ctx;
 280         desc->flags = req->base.flags;
 281
 282         return shash_ahash_finup(req, desc);
 283 }
 284
 285 int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
 286 {
 287         unsigned int nbytes = req->nbytes;
 288         struct scatterlist *sg;
 289         unsigned int offset;
 290         int err;
 291
 292         if (nbytes &&
 293             (sg = req->src, offset = sg->offset,
 294              nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
 295                 void *data;
 296
 297                 data = crypto_kmap(sg_page(sg), 0);
 298                 err = crypto_shash_digest(desc, data + offset, nbytes,
 299                                           req->result);
 300                 crypto_kunmap(data, 0);
 301                 crypto_yield(desc->flags);
 302         } else
 303                 err = crypto_shash_init(desc) ?:
 304                       shash_ahash_finup(req, desc);
 305
 306         return err;
 307 }
 308 EXPORT_SYMBOL_GPL(shash_ahash_digest);
 309
 310 static int shash_async_digest(struct ahash_request *req)
 311 {
 312         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 313         struct shash_desc *desc = ahash_request_ctx(req);
 314
 315         desc->tfm = *ctx;
 316         desc->flags = req->base.flags;
 317
 318         return shash_ahash_digest(req, desc);
 319 }
 320
 321 static int shash_async_export(struct ahash_request *req, void *out)
 322 {
 323         return crypto_shash_export(ahash_request_ctx(req), out);
 324 }
 325
 326 static int shash_async_import(struct ahash_request *req, const void *in)
 327 {
 328         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 329         struct shash_desc *desc = ahash_request_ctx(req);
 330
 331         desc->tfm = *ctx;
 332         desc->flags = req->base.flags;
 333
 334         return crypto_shash_import(desc, in);
 335 }
 336
 337 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
 338 {
 339         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
 340
 341         crypto_free_shash(*ctx);
 342 }
 343
 344 int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
 345 {
 346         struct crypto_alg *calg = tfm->__crt_alg;
 347         struct shash_alg *alg = __crypto_shash_alg(calg);
 348         struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
 349         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
 350         struct crypto_shash *shash;
 351
 352         if (!crypto_mod_get(calg))
 353                 return -EAGAIN;
 354
 355         shash = crypto_create_tfm(calg, &crypto_shash_type);
 356         if (IS_ERR(shash)) {
 357                 crypto_mod_put(calg);
 358                 return PTR_ERR(shash);
 359         }
 360
 361         *ctx = shash;
 362         tfm->exit = crypto_exit_shash_ops_async;
 363
 364         crt->init = shash_async_init;
 365         crt->update = shash_async_update;
 366         crt->final = shash_async_final;
 367         crt->finup = shash_async_finup;
 368         crt->digest = shash_async_digest;
 369         crt->setkey = shash_async_setkey;
 370
 371         crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
 372                                     CRYPTO_TFM_NEED_KEY);
 373
 374         if (alg->export)
 375                 crt->export = shash_async_export;
 376         if (alg->import)
 377                 crt->import = shash_async_import;
 378
 379         crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
 380
 381         return 0;
 382 }
 383
 384 static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
 385                                unsigned int keylen)
 386 {
 387         struct shash_desc **descp = crypto_hash_ctx(tfm);
 388         struct shash_desc *desc = *descp;
 389
 390         return crypto_shash_setkey(desc->tfm, key, keylen);
 391 }
 392
 393 static int shash_compat_init(struct hash_desc *hdesc)
 394 {
 395         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 396         struct shash_desc *desc = *descp;
 397
 398         desc->flags = hdesc->flags;
 399
 400         return crypto_shash_init(desc);
 401 }
 402
 403 static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
 404                                unsigned int len)
 405 {
 406         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 407         struct shash_desc *desc = *descp;
 408         struct crypto_hash_walk walk;
 409         int nbytes;
 410
 411         for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
 412              nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
 413                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
 414
 415         return nbytes;
 416 }
 417
 418 static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
 419 {
 420         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 421
 422         return crypto_shash_final(*descp, out);
 423 }
 424
 425 static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
 426                                unsigned int nbytes, u8 *out)
 427 {
 428         unsigned int offset = sg->offset;
 429         int err;
 430
 431         if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
 432                 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 433                 struct shash_desc *desc = *descp;
 434                 void *data;
 435
 436                 desc->flags = hdesc->flags;
 437
 438                 data = crypto_kmap(sg_page(sg), 0);
 439                 err = crypto_shash_digest(desc, data + offset, nbytes, out);
 440                 crypto_kunmap(data, 0);
 441                 crypto_yield(desc->flags);
 442                 goto out;
 443         }
 444
 445         err = shash_compat_init(hdesc);
 446         if (err)
 447                 goto out;
 448
 449         err = shash_compat_update(hdesc, sg, nbytes);
 450         if (err)
 451                 goto out;
 452
 453         err = shash_compat_final(hdesc, out);
 454
 455 out:
 456         return err;
 457 }
 458
 459 static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
 460 {
 461         struct shash_desc **descp = crypto_tfm_ctx(tfm);
 462         struct shash_desc *desc = *descp;
 463
 464         crypto_free_shash(desc->tfm);
 465         kzfree(desc);
 466 }
 467
 468 static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
 469 {
 470         struct hash_tfm *crt = &tfm->crt_hash;
 471         struct crypto_alg *calg = tfm->__crt_alg;
 472         struct shash_alg *alg = __crypto_shash_alg(calg);
 473         struct shash_desc **descp = crypto_tfm_ctx(tfm);
 474         struct crypto_shash *shash;
 475         struct shash_desc *desc;
 476
 477         if (!crypto_mod_get(calg))
 478                 return -EAGAIN;
 479
 480         shash = crypto_create_tfm(calg, &crypto_shash_type);
 481         if (IS_ERR(shash)) {
 482                 crypto_mod_put(calg);
 483                 return PTR_ERR(shash);
 484         }
 485
 486         desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
 487                        GFP_KERNEL);
 488         if (!desc) {
 489                 crypto_free_shash(shash);
 490                 return -ENOMEM;
 491         }
 492
 493         *descp = desc;
 494         desc->tfm = shash;
 495         tfm->exit = crypto_exit_shash_ops_compat;
 496
 497         crt->init = shash_compat_init;
 498         crt->update = shash_compat_update;
 499         crt->final  = shash_compat_final;
 500         crt->digest = shash_compat_digest;
 501         crt->setkey = shash_compat_setkey;
 502
 503         crt->digestsize = alg->digestsize;
 504
 505         return 0;
 506 }
 507
 508 static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
 509 {
 510         switch (mask & CRYPTO_ALG_TYPE_MASK) {
 511         case CRYPTO_ALG_TYPE_HASH_MASK:
 512                 return crypto_init_shash_ops_compat(tfm);
 513         }
 514
 515         return -EINVAL;
 516 }
 517
 518 static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
 519                                          u32 mask)
 520 {
 521         switch (mask & CRYPTO_ALG_TYPE_MASK) {
 522         case CRYPTO_ALG_TYPE_HASH_MASK:
 523                 return sizeof(struct shash_desc *);
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
 530 {
 531         struct crypto_shash *hash = __crypto_shash_cast(tfm);
 532         struct shash_alg *alg = crypto_shash_alg(hash);
 533
 534         hash->descsize = alg->descsize;
 535
 536         if (crypto_shash_alg_has_setkey(alg) &&
 537             !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
 538                 crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
 539
 540         return 0;
 541 }
 542
 543 static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
 544 {
 545         return alg->cra_ctxsize;
 546 }
 547
 548 #ifdef CONFIG_NET
 549 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
 550 {
 551         struct crypto_report_hash rhash;
 552         struct shash_alg *salg = __crypto_shash_alg(alg);
 553
 554         strncpy(rhash.type, "shash", sizeof(rhash.type));
 555
 556         rhash.blocksize = alg->cra_blocksize;
 557         rhash.digestsize = salg->digestsize;
 558
 559         NLA_PUT(skb, CRYPTOCFGA_REPORT_HASH,
 560                 sizeof(struct crypto_report_hash), &rhash);
 561
 562         return 0;
 563
 564 nla_put_failure:
 565         return -EMSGSIZE;
 566 }
 567 #else
 568 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
 569 {
 570         return -ENOSYS;
 571 }
 572 #endif
 573
 574 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
 575         __attribute__ ((unused));
 576 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
 577 {
 578         struct shash_alg *salg = __crypto_shash_alg(alg);
 579
 580         seq_printf(m, "type         : shash\n");
 581         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 582         seq_printf(m, "digestsize   : %u\n", salg->digestsize);
 583 }
 584
 585 static const struct crypto_type crypto_shash_type = {
 586         .ctxsize = crypto_shash_ctxsize,
 587         .extsize = crypto_shash_extsize,
 588         .init = crypto_init_shash_ops,
 589         .init_tfm = crypto_shash_init_tfm,
 590 #ifdef CONFIG_PROC_FS
 591         .show = crypto_shash_show,
 592 #endif
 593         .report = crypto_shash_report,
 594         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 595         .maskset = CRYPTO_ALG_TYPE_MASK,
 596         .type = CRYPTO_ALG_TYPE_SHASH,
 597         .tfmsize = offsetof(struct crypto_shash, base),
 598 };
 599
 600 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
 601                                         u32 mask)
 602 {
 603         return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
 604 }
 605 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
 606
 607 static int shash_prepare_alg(struct shash_alg *alg)
 608 {
 609         struct crypto_alg *base = &alg->base;
 610
 611         if (alg->digestsize > PAGE_SIZE / 8 ||
 612             alg->descsize > PAGE_SIZE / 8 ||
 613             alg->statesize > PAGE_SIZE / 8)
 614                 return -EINVAL;
 615
 616         base->cra_type = &crypto_shash_type;
 617         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 618         base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
 619
 620         if (!alg->finup)
 621                 alg->finup = shash_finup_unaligned;
 622         if (!alg->digest)
 623                 alg->digest = shash_digest_unaligned;
 624         if (!alg->export) {
 625                 alg->export = shash_default_export;
 626                 alg->import = shash_default_import;
 627                 alg->statesize = alg->descsize;
 628         }
 629         if (!alg->setkey)
 630                 alg->setkey = shash_no_setkey;
 631
 632         return 0;
 633 }
 634
 635 int crypto_register_shash(struct shash_alg *alg)
 636 {
 637         struct crypto_alg *base = &alg->base;
 638         int err;
 639
 640         err = shash_prepare_alg(alg);
 641         if (err)
 642                 return err;
 643
 644         return crypto_register_alg(base);
 645 }
 646 EXPORT_SYMBOL_GPL(crypto_register_shash);
 647
 648 int crypto_unregister_shash(struct shash_alg *alg)
 649 {
 650         return crypto_unregister_alg(&alg->base);
 651 }
 652 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
 653
 654 int shash_register_instance(struct crypto_template *tmpl,
 655                             struct shash_instance *inst)
 656 {
 657         int err;
 658
 659         err = shash_prepare_alg(&inst->alg);
 660         if (err)
 661                 return err;
 662
 663         return crypto_register_instance(tmpl, shash_crypto_instance(inst));
 664 }
 665 EXPORT_SYMBOL_GPL(shash_register_instance);
 666
 667 void shash_free_instance(struct crypto_instance *inst)
 668 {
 669         crypto_drop_spawn(crypto_instance_ctx(inst));
 670         kfree(shash_instance(inst));
 671 }
 672 EXPORT_SYMBOL_GPL(shash_free_instance);
 673
 674 int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
 675                             struct shash_alg *alg,
 676                             struct crypto_instance *inst)
 677 {
 678         return crypto_init_spawn2(&spawn->base, &alg->base, inst,
 679                                   &crypto_shash_type);
 680 }
 681 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
 682
 683 struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
 684 {
 685         struct crypto_alg *alg;
 686
 687         alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
 688         return IS_ERR(alg) ? ERR_CAST(alg) :
 689                container_of(alg, struct shash_alg, base);
 690 }
 691 EXPORT_SYMBOL_GPL(shash_attr_alg);
 692
 693 MODULE_LICENSE("GPL");
 694 MODULE_DESCRIPTION("Synchronous cryptographic hash type");