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         typedef u8 __attribute__ ((aligned)) u8_aligned;
  79         return len + (mask & ~(__alignof__(u8_aligned) - 1));
  80 }
  81
  82 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
  83                                   unsigned int len)
  84 {
  85         struct crypto_shash *tfm = desc->tfm;
  86         struct shash_alg *shash = crypto_shash_alg(tfm);
  87         unsigned long alignmask = crypto_shash_alignmask(tfm);
  88         unsigned int unaligned_len = alignmask + 1 -
  89                                      ((unsigned long)data & alignmask);
  90         u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
  91                 __attribute__ ((aligned));
  92         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
  93         int err;
  94
  95         if (unaligned_len > len)
  96                 unaligned_len = len;
  97
  98         memcpy(buf, data, unaligned_len);
  99         err = shash->update(desc, buf, unaligned_len);
 100         memset(buf, 0, unaligned_len);
 101
 102         return err ?:
 103                shash->update(desc, data + unaligned_len, len - unaligned_len);
 104 }
 105
 106 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
 107                         unsigned int len)
 108 {
 109         struct crypto_shash *tfm = desc->tfm;
 110         struct shash_alg *shash = crypto_shash_alg(tfm);
 111         unsigned long alignmask = crypto_shash_alignmask(tfm);
 112
 113         if ((unsigned long)data & alignmask)
 114                 return shash_update_unaligned(desc, data, len);
 115
 116         return shash->update(desc, data, len);
 117 }
 118 EXPORT_SYMBOL_GPL(crypto_shash_update);
 119
 120 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
 121 {
 122         struct crypto_shash *tfm = desc->tfm;
 123         unsigned long alignmask = crypto_shash_alignmask(tfm);
 124         struct shash_alg *shash = crypto_shash_alg(tfm);
 125         unsigned int ds = crypto_shash_digestsize(tfm);
 126         u8 ubuf[shash_align_buffer_size(ds, alignmask)]
 127                 __attribute__ ((aligned));
 128         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
 129         int err;
 130
 131         err = shash->final(desc, buf);
 132         if (err)
 133                 goto out;
 134
 135         memcpy(out, buf, ds);
 136
 137 out:
 138         memset(buf, 0, ds);
 139         return err;
 140 }
 141
 142 int crypto_shash_final(struct shash_desc *desc, u8 *out)
 143 {
 144         struct crypto_shash *tfm = desc->tfm;
 145         struct shash_alg *shash = crypto_shash_alg(tfm);
 146         unsigned long alignmask = crypto_shash_alignmask(tfm);
 147
 148         if ((unsigned long)out & alignmask)
 149                 return shash_final_unaligned(desc, out);
 150
 151         return shash->final(desc, out);
 152 }
 153 EXPORT_SYMBOL_GPL(crypto_shash_final);
 154
 155 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
 156                                  unsigned int len, u8 *out)
 157 {
 158         return crypto_shash_update(desc, data, len) ?:
 159                crypto_shash_final(desc, out);
 160 }
 161
 162 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
 163                        unsigned int len, u8 *out)
 164 {
 165         struct crypto_shash *tfm = desc->tfm;
 166         struct shash_alg *shash = crypto_shash_alg(tfm);
 167         unsigned long alignmask = crypto_shash_alignmask(tfm);
 168
 169         if (((unsigned long)data | (unsigned long)out) & alignmask)
 170                 return shash_finup_unaligned(desc, data, len, out);
 171
 172         return shash->finup(desc, data, len, out);
 173 }
 174 EXPORT_SYMBOL_GPL(crypto_shash_finup);
 175
 176 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
 177                                   unsigned int len, u8 *out)
 178 {
 179         return crypto_shash_init(desc) ?:
 180                crypto_shash_finup(desc, data, len, out);
 181 }
 182
 183 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
 184                         unsigned int len, u8 *out)
 185 {
 186         struct crypto_shash *tfm = desc->tfm;
 187         struct shash_alg *shash = crypto_shash_alg(tfm);
 188         unsigned long alignmask = crypto_shash_alignmask(tfm);
 189
 190         if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 191                 return -ENOKEY;
 192
 193         if (((unsigned long)data | (unsigned long)out) & alignmask)
 194                 return shash_digest_unaligned(desc, data, len, out);
 195
 196         return shash->digest(desc, data, len, out);
 197 }
 198 EXPORT_SYMBOL_GPL(crypto_shash_digest);
 199
 200 static int shash_default_export(struct shash_desc *desc, void *out)
 201 {
 202         memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
 203         return 0;
 204 }
 205
 206 static int shash_default_import(struct shash_desc *desc, const void *in)
 207 {
 208         memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
 209         return 0;
 210 }
 211
 212 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
 213                               unsigned int keylen)
 214 {
 215         struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
 216
 217         return crypto_shash_setkey(*ctx, key, keylen);
 218 }
 219
 220 static int shash_async_init(struct ahash_request *req)
 221 {
 222         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 223         struct shash_desc *desc = ahash_request_ctx(req);
 224
 225         desc->tfm = *ctx;
 226         desc->flags = req->base.flags;
 227
 228         return crypto_shash_init(desc);
 229 }
 230
 231 int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
 232 {
 233         struct crypto_hash_walk walk;
 234         int nbytes;
 235
 236         for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
 237              nbytes = crypto_hash_walk_done(&walk, nbytes))
 238                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
 239
 240         return nbytes;
 241 }
 242 EXPORT_SYMBOL_GPL(shash_ahash_update);
 243
 244 static int shash_async_update(struct ahash_request *req)
 245 {
 246         return shash_ahash_update(req, ahash_request_ctx(req));
 247 }
 248
 249 static int shash_async_final(struct ahash_request *req)
 250 {
 251         return crypto_shash_final(ahash_request_ctx(req), req->result);
 252 }
 253
 254 int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
 255 {
 256         struct crypto_hash_walk walk;
 257         int nbytes;
 258
 259         nbytes = crypto_hash_walk_first(req, &walk);
 260         if (!nbytes)
 261                 return crypto_shash_final(desc, req->result);
 262
 263         do {
 264                 nbytes = crypto_hash_walk_last(&walk) ?
 265                          crypto_shash_finup(desc, walk.data, nbytes,
 266                                             req->result) :
 267                          crypto_shash_update(desc, walk.data, nbytes);
 268                 nbytes = crypto_hash_walk_done(&walk, nbytes);
 269         } while (nbytes > 0);
 270
 271         return nbytes;
 272 }
 273 EXPORT_SYMBOL_GPL(shash_ahash_finup);
 274
 275 static int shash_async_finup(struct ahash_request *req)
 276 {
 277         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 278         struct shash_desc *desc = ahash_request_ctx(req);
 279
 280         desc->tfm = *ctx;
 281         desc->flags = req->base.flags;
 282
 283         return shash_ahash_finup(req, desc);
 284 }
 285
 286 int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
 287 {
 288         unsigned int nbytes = req->nbytes;
 289         struct scatterlist *sg;
 290         unsigned int offset;
 291         int err;
 292
 293         if (nbytes &&
 294             (sg = req->src, offset = sg->offset,
 295              nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
 296                 void *data;
 297
 298                 data = kmap_atomic(sg_page(sg));
 299                 err = crypto_shash_digest(desc, data + offset, nbytes,
 300                                           req->result);
 301                 kunmap_atomic(data);
 302                 crypto_yield(desc->flags);
 303         } else
 304                 err = crypto_shash_init(desc) ?:
 305                       shash_ahash_finup(req, desc);
 306
 307         return err;
 308 }
 309 EXPORT_SYMBOL_GPL(shash_ahash_digest);
 310
 311 static int shash_async_digest(struct ahash_request *req)
 312 {
 313         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 314         struct shash_desc *desc = ahash_request_ctx(req);
 315
 316         desc->tfm = *ctx;
 317         desc->flags = req->base.flags;
 318
 319         return shash_ahash_digest(req, desc);
 320 }
 321
 322 static int shash_async_export(struct ahash_request *req, void *out)
 323 {
 324         return crypto_shash_export(ahash_request_ctx(req), out);
 325 }
 326
 327 static int shash_async_import(struct ahash_request *req, const void *in)
 328 {
 329         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
 330         struct shash_desc *desc = ahash_request_ctx(req);
 331
 332         desc->tfm = *ctx;
 333         desc->flags = req->base.flags;
 334
 335         return crypto_shash_import(desc, in);
 336 }
 337
 338 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
 339 {
 340         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
 341
 342         crypto_free_shash(*ctx);
 343 }
 344
 345 int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
 346 {
 347         struct crypto_alg *calg = tfm->__crt_alg;
 348         struct shash_alg *alg = __crypto_shash_alg(calg);
 349         struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
 350         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
 351         struct crypto_shash *shash;
 352
 353         if (!crypto_mod_get(calg))
 354                 return -EAGAIN;
 355
 356         shash = crypto_create_tfm(calg, &crypto_shash_type);
 357         if (IS_ERR(shash)) {
 358                 crypto_mod_put(calg);
 359                 return PTR_ERR(shash);
 360         }
 361
 362         *ctx = shash;
 363         tfm->exit = crypto_exit_shash_ops_async;
 364
 365         crt->init = shash_async_init;
 366         crt->update = shash_async_update;
 367         crt->final = shash_async_final;
 368         crt->finup = shash_async_finup;
 369         crt->digest = shash_async_digest;
 370         crt->setkey = shash_async_setkey;
 371
 372         crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
 373                                     CRYPTO_TFM_NEED_KEY);
 374
 375         if (alg->export)
 376                 crt->export = shash_async_export;
 377         if (alg->import)
 378                 crt->import = shash_async_import;
 379
 380         crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
 381
 382         return 0;
 383 }
 384
 385 static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
 386                                unsigned int keylen)
 387 {
 388         struct shash_desc **descp = crypto_hash_ctx(tfm);
 389         struct shash_desc *desc = *descp;
 390
 391         return crypto_shash_setkey(desc->tfm, key, keylen);
 392 }
 393
 394 static int shash_compat_init(struct hash_desc *hdesc)
 395 {
 396         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 397         struct shash_desc *desc = *descp;
 398
 399         desc->flags = hdesc->flags;
 400
 401         return crypto_shash_init(desc);
 402 }
 403
 404 static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
 405                                unsigned int len)
 406 {
 407         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 408         struct shash_desc *desc = *descp;
 409         struct crypto_hash_walk walk;
 410         int nbytes;
 411
 412         for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
 413              nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
 414                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
 415
 416         return nbytes;
 417 }
 418
 419 static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
 420 {
 421         struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 422
 423         return crypto_shash_final(*descp, out);
 424 }
 425
 426 static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
 427                                unsigned int nbytes, u8 *out)
 428 {
 429         unsigned int offset = sg->offset;
 430         int err;
 431
 432         if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
 433                 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
 434                 struct shash_desc *desc = *descp;
 435                 void *data;
 436
 437                 desc->flags = hdesc->flags;
 438
 439                 data = kmap_atomic(sg_page(sg));
 440                 err = crypto_shash_digest(desc, data + offset, nbytes, out);
 441                 kunmap_atomic(data);
 442                 crypto_yield(desc->flags);
 443                 goto out;
 444         }
 445
 446         err = shash_compat_init(hdesc);
 447         if (err)
 448                 goto out;
 449
 450         err = shash_compat_update(hdesc, sg, nbytes);
 451         if (err)
 452                 goto out;
 453
 454         err = shash_compat_final(hdesc, out);
 455
 456 out:
 457         return err;
 458 }
 459
 460 static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
 461 {
 462         struct shash_desc **descp = crypto_tfm_ctx(tfm);
 463         struct shash_desc *desc = *descp;
 464
 465         crypto_free_shash(desc->tfm);
 466         kzfree(desc);
 467 }
 468
 469 static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
 470 {
 471         struct hash_tfm *crt = &tfm->crt_hash;
 472         struct crypto_alg *calg = tfm->__crt_alg;
 473         struct shash_alg *alg = __crypto_shash_alg(calg);
 474         struct shash_desc **descp = crypto_tfm_ctx(tfm);
 475         struct crypto_shash *shash;
 476         struct shash_desc *desc;
 477
 478         if (!crypto_mod_get(calg))
 479                 return -EAGAIN;
 480
 481         shash = crypto_create_tfm(calg, &crypto_shash_type);
 482         if (IS_ERR(shash)) {
 483                 crypto_mod_put(calg);
 484                 return PTR_ERR(shash);
 485         }
 486
 487         desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
 488                        GFP_KERNEL);
 489         if (!desc) {
 490                 crypto_free_shash(shash);
 491                 return -ENOMEM;
 492         }
 493
 494         *descp = desc;
 495         desc->tfm = shash;
 496         tfm->exit = crypto_exit_shash_ops_compat;
 497
 498         crt->init = shash_compat_init;
 499         crt->update = shash_compat_update;
 500         crt->final  = shash_compat_final;
 501         crt->digest = shash_compat_digest;
 502         crt->setkey = shash_compat_setkey;
 503
 504         crt->digestsize = alg->digestsize;
 505
 506         return 0;
 507 }
 508
 509 static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
 510 {
 511         switch (mask & CRYPTO_ALG_TYPE_MASK) {
 512         case CRYPTO_ALG_TYPE_HASH_MASK:
 513                 return crypto_init_shash_ops_compat(tfm);
 514         }
 515
 516         return -EINVAL;
 517 }
 518
 519 static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
 520                                          u32 mask)
 521 {
 522         switch (mask & CRYPTO_ALG_TYPE_MASK) {
 523         case CRYPTO_ALG_TYPE_HASH_MASK:
 524                 return sizeof(struct shash_desc *);
 525         }
 526
 527         return 0;
 528 }
 529
 530 static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
 531 {
 532         struct crypto_shash *hash = __crypto_shash_cast(tfm);
 533         struct shash_alg *alg = crypto_shash_alg(hash);
 534
 535         hash->descsize = alg->descsize;
 536
 537         if (crypto_shash_alg_has_setkey(alg) &&
 538             !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
 539                 crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
 540
 541         return 0;
 542 }
 543
 544 static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
 545 {
 546         return alg->cra_ctxsize;
 547 }
 548
 549 #ifdef CONFIG_NET
 550 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
 551 {
 552         struct crypto_report_hash rhash;
 553         struct shash_alg *salg = __crypto_shash_alg(alg);
 554
 555         strncpy(rhash.type, "shash", sizeof(rhash.type));
 556
 557         rhash.blocksize = alg->cra_blocksize;
 558         rhash.digestsize = salg->digestsize;
 559
 560         if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
 561                     sizeof(struct crypto_report_hash), &rhash))
 562                 goto nla_put_failure;
 563         return 0;
 564
 565 nla_put_failure:
 566         return -EMSGSIZE;
 567 }
 568 #else
 569 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
 570 {
 571         return -ENOSYS;
 572 }
 573 #endif
 574
 575 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
 576         __attribute__ ((unused));
 577 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
 578 {
 579         struct shash_alg *salg = __crypto_shash_alg(alg);
 580
 581         seq_printf(m, "type         : shash\n");
 582         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 583         seq_printf(m, "digestsize   : %u\n", salg->digestsize);
 584 }
 585
 586 static const struct crypto_type crypto_shash_type = {
 587         .ctxsize = crypto_shash_ctxsize,
 588         .extsize = crypto_shash_extsize,
 589         .init = crypto_init_shash_ops,
 590         .init_tfm = crypto_shash_init_tfm,
 591 #ifdef CONFIG_PROC_FS
 592         .show = crypto_shash_show,
 593 #endif
 594         .report = crypto_shash_report,
 595         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 596         .maskset = CRYPTO_ALG_TYPE_MASK,
 597         .type = CRYPTO_ALG_TYPE_SHASH,
 598         .tfmsize = offsetof(struct crypto_shash, base),
 599 };
 600
 601 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
 602                                         u32 mask)
 603 {
 604         return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
 605 }
 606 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
 607
 608 static int shash_prepare_alg(struct shash_alg *alg)
 609 {
 610         struct crypto_alg *base = &alg->base;
 611
 612         if (alg->digestsize > PAGE_SIZE / 8 ||
 613             alg->descsize > PAGE_SIZE / 8 ||
 614             alg->statesize > PAGE_SIZE / 8)
 615                 return -EINVAL;
 616
 617         base->cra_type = &crypto_shash_type;
 618         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 619         base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
 620
 621         if (!alg->finup)
 622                 alg->finup = shash_finup_unaligned;
 623         if (!alg->digest)
 624                 alg->digest = shash_digest_unaligned;
 625         if (!alg->export) {
 626                 alg->export = shash_default_export;
 627                 alg->import = shash_default_import;
 628                 alg->statesize = alg->descsize;
 629         }
 630         if (!alg->setkey)
 631                 alg->setkey = shash_no_setkey;
 632
 633         return 0;
 634 }
 635
 636 int crypto_register_shash(struct shash_alg *alg)
 637 {
 638         struct crypto_alg *base = &alg->base;
 639         int err;
 640
 641         err = shash_prepare_alg(alg);
 642         if (err)
 643                 return err;
 644
 645         return crypto_register_alg(base);
 646 }
 647 EXPORT_SYMBOL_GPL(crypto_register_shash);
 648
 649 int crypto_unregister_shash(struct shash_alg *alg)
 650 {
 651         return crypto_unregister_alg(&alg->base);
 652 }
 653 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
 654
 655 int crypto_register_shashes(struct shash_alg *algs, int count)
 656 {
 657         int i, ret;
 658
 659         for (i = 0; i < count; i++) {
 660                 ret = crypto_register_shash(&algs[i]);
 661                 if (ret)
 662                         goto err;
 663         }
 664
 665         return 0;
 666
 667 err:
 668         for (--i; i >= 0; --i)
 669                 crypto_unregister_shash(&algs[i]);
 670
 671         return ret;
 672 }
 673 EXPORT_SYMBOL_GPL(crypto_register_shashes);
 674
 675 int crypto_unregister_shashes(struct shash_alg *algs, int count)
 676 {
 677         int i, ret;
 678
 679         for (i = count - 1; i >= 0; --i) {
 680                 ret = crypto_unregister_shash(&algs[i]);
 681                 if (ret)
 682                         pr_err("Failed to unregister %s %s: %d\n",
 683                                algs[i].base.cra_driver_name,
 684                                algs[i].base.cra_name, ret);
 685         }
 686
 687         return 0;
 688 }
 689 EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
 690
 691 int shash_register_instance(struct crypto_template *tmpl,
 692                             struct shash_instance *inst)
 693 {
 694         int err;
 695
 696         err = shash_prepare_alg(&inst->alg);
 697         if (err)
 698                 return err;
 699
 700         return crypto_register_instance(tmpl, shash_crypto_instance(inst));
 701 }
 702 EXPORT_SYMBOL_GPL(shash_register_instance);
 703
 704 void shash_free_instance(struct crypto_instance *inst)
 705 {
 706         crypto_drop_spawn(crypto_instance_ctx(inst));
 707         kfree(shash_instance(inst));
 708 }
 709 EXPORT_SYMBOL_GPL(shash_free_instance);
 710
 711 int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
 712                             struct shash_alg *alg,
 713                             struct crypto_instance *inst)
 714 {
 715         return crypto_init_spawn2(&spawn->base, &alg->base, inst,
 716                                   &crypto_shash_type);
 717 }
 718 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
 719
 720 struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
 721 {
 722         struct crypto_alg *alg;
 723
 724         alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
 725         return IS_ERR(alg) ? ERR_CAST(alg) :
 726                container_of(alg, struct shash_alg, base);
 727 }
 728 EXPORT_SYMBOL_GPL(shash_attr_alg);
 729
 730 MODULE_LICENSE("GPL");
 731 MODULE_DESCRIPTION("Synchronous cryptographic hash type");