git.oblomov.eu Git - wine/blob - dlls/crypt32/serialize.c

   1 /*
   2  * Copyright 2004-2006 Juan Lang
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18 #include <stdarg.h>
  19 #include "windef.h"
  20 #include "winbase.h"
  21 #include "wincrypt.h"
  22 #include "wine/debug.h"
  23 #include "wine/exception.h"
  24 #include "crypt32_private.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(crypt);
  27
  28 /* An extended certificate property in serialized form is prefixed by this
  29  * header.
  30  */
  31 typedef struct _WINE_CERT_PROP_HEADER
  32 {
  33     DWORD propID;
  34     DWORD unknown; /* always 1 */
  35     DWORD cb;
  36 } WINE_CERT_PROP_HEADER, *PWINE_CERT_PROP_HEADER;
  37
  38 static BOOL CRYPT_SerializeStoreElement(const void *context,
  39  const BYTE *encodedContext, DWORD cbEncodedContext, DWORD contextPropID,
  40  PCWINE_CONTEXT_INTERFACE contextInterface, DWORD dwFlags, BOOL omitHashes,
  41  BYTE *pbElement, DWORD *pcbElement)
  42 {
  43     BOOL ret;
  44
  45     TRACE("(%p, %p, %08x, %d, %p, %p)\n", context, contextInterface, dwFlags,
  46      omitHashes, pbElement, pcbElement);
  47
  48     if (context)
  49     {
  50         DWORD bytesNeeded = sizeof(WINE_CERT_PROP_HEADER) + cbEncodedContext;
  51         DWORD prop = 0;
  52
  53         ret = TRUE;
  54         do {
  55             prop = contextInterface->enumProps(context, prop);
  56             if (prop && (!omitHashes || !IS_CERT_HASH_PROP_ID(prop)))
  57             {
  58                 DWORD propSize = 0;
  59
  60                 ret = contextInterface->getProp(context, prop, NULL, &propSize);
  61                 if (ret)
  62                     bytesNeeded += sizeof(WINE_CERT_PROP_HEADER) + propSize;
  63             }
  64         } while (ret && prop != 0);
  65
  66         if (!pbElement)
  67         {
  68             *pcbElement = bytesNeeded;
  69             ret = TRUE;
  70         }
  71         else if (*pcbElement < bytesNeeded)
  72         {
  73             *pcbElement = bytesNeeded;
  74             SetLastError(ERROR_MORE_DATA);
  75             ret = FALSE;
  76         }
  77         else
  78         {
  79             PWINE_CERT_PROP_HEADER hdr;
  80             DWORD bufSize = 0;
  81             LPBYTE buf = NULL;
  82
  83             prop = 0;
  84             do {
  85                 prop = contextInterface->enumProps(context, prop);
  86                 if (prop && (!omitHashes || !IS_CERT_HASH_PROP_ID(prop)))
  87                 {
  88                     DWORD propSize = 0;
  89
  90                     ret = contextInterface->getProp(context, prop, NULL,
  91                      &propSize);
  92                     if (ret)
  93                     {
  94                         if (bufSize < propSize)
  95                         {
  96                             if (buf)
  97                                 buf = CryptMemRealloc(buf, propSize);
  98                             else
  99                                 buf = CryptMemAlloc(propSize);
 100                             bufSize = propSize;
 101                         }
 102                         if (buf)
 103                         {
 104                             ret = contextInterface->getProp(context, prop, buf,
 105                              &propSize);
 106                             if (ret)
 107                             {
 108                                 hdr = (PWINE_CERT_PROP_HEADER)pbElement;
 109                                 hdr->propID = prop;
 110                                 hdr->unknown = 1;
 111                                 hdr->cb = propSize;
 112                                 pbElement += sizeof(WINE_CERT_PROP_HEADER);
 113                                 if (propSize)
 114                                 {
 115                                     memcpy(pbElement, buf, propSize);
 116                                     pbElement += propSize;
 117                                 }
 118                             }
 119                         }
 120                         else
 121                             ret = FALSE;
 122                     }
 123                 }
 124             } while (ret && prop != 0);
 125             CryptMemFree(buf);
 126
 127             hdr = (PWINE_CERT_PROP_HEADER)pbElement;
 128             hdr->propID = contextPropID;
 129             hdr->unknown = 1;
 130             hdr->cb = cbEncodedContext;
 131             memcpy(pbElement + sizeof(WINE_CERT_PROP_HEADER),
 132              encodedContext, cbEncodedContext);
 133         }
 134     }
 135     else
 136         ret = FALSE;
 137     return ret;
 138 }
 139
 140 BOOL WINAPI CertSerializeCertificateStoreElement(PCCERT_CONTEXT pCertContext,
 141  DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
 142 {
 143     return CRYPT_SerializeStoreElement(pCertContext,
 144      pCertContext->pbCertEncoded, pCertContext->cbCertEncoded,
 145      CERT_CERT_PROP_ID, pCertInterface, dwFlags, FALSE, pbElement, pcbElement);
 146 }
 147
 148 BOOL WINAPI CertSerializeCRLStoreElement(PCCRL_CONTEXT pCrlContext,
 149  DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
 150 {
 151     return CRYPT_SerializeStoreElement(pCrlContext,
 152      pCrlContext->pbCrlEncoded, pCrlContext->cbCrlEncoded,
 153      CERT_CRL_PROP_ID, pCRLInterface, dwFlags, FALSE, pbElement, pcbElement);
 154 }
 155
 156 BOOL WINAPI CertSerializeCTLStoreElement(PCCTL_CONTEXT pCtlContext,
 157  DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
 158 {
 159     return CRYPT_SerializeStoreElement(pCtlContext,
 160      pCtlContext->pbCtlEncoded, pCtlContext->cbCtlEncoded,
 161      CERT_CTL_PROP_ID, pCTLInterface, dwFlags, FALSE, pbElement, pcbElement);
 162 }
 163
 164 /* Looks for the property with ID propID in the buffer buf.  Returns a pointer
 165  * to its header if a valid header is found, NULL if not.  Valid means the
 166  * length of thte property won't overrun buf, and the unknown field is 1.
 167  */
 168 static const WINE_CERT_PROP_HEADER *CRYPT_findPropID(const BYTE *buf,
 169  DWORD size, DWORD propID)
 170 {
 171     const WINE_CERT_PROP_HEADER *ret = NULL;
 172     BOOL done = FALSE;
 173
 174     while (size && !ret && !done)
 175     {
 176         if (size < sizeof(WINE_CERT_PROP_HEADER))
 177         {
 178             SetLastError(CRYPT_E_FILE_ERROR);
 179             done = TRUE;
 180         }
 181         else
 182         {
 183             const WINE_CERT_PROP_HEADER *hdr =
 184              (const WINE_CERT_PROP_HEADER *)buf;
 185
 186             size -= sizeof(WINE_CERT_PROP_HEADER);
 187             buf += sizeof(WINE_CERT_PROP_HEADER);
 188             if (size < hdr->cb)
 189             {
 190                 SetLastError(E_INVALIDARG);
 191                 done = TRUE;
 192             }
 193             else if (!hdr->propID)
 194             {
 195                 /* assume a zero prop ID means the data are uninitialized, so
 196                  * stop looking.
 197                  */
 198                 done = TRUE;
 199             }
 200             else if (hdr->unknown != 1)
 201             {
 202                 SetLastError(ERROR_FILE_NOT_FOUND);
 203                 done = TRUE;
 204             }
 205             else if (hdr->propID == propID)
 206                 ret = hdr;
 207             else
 208             {
 209                 buf += hdr->cb;
 210                 size -= hdr->cb;
 211             }
 212         }
 213     }
 214     return ret;
 215 }
 216
 217 static BOOL CRYPT_ReadContextProp(
 218  const WINE_CONTEXT_INTERFACE *contextInterface, const void *context,
 219  const WINE_CERT_PROP_HEADER *hdr, const BYTE *pbElement, DWORD cbElement)
 220 {
 221     BOOL ret;
 222
 223     if (cbElement < hdr->cb)
 224     {
 225         SetLastError(E_INVALIDARG);
 226         ret = FALSE;
 227     }
 228     else if (hdr->unknown != 1)
 229     {
 230         SetLastError(ERROR_FILE_NOT_FOUND);
 231         ret = FALSE;
 232     }
 233     else if (hdr->propID != CERT_CERT_PROP_ID &&
 234      hdr->propID != CERT_CRL_PROP_ID && hdr->propID != CERT_CTL_PROP_ID)
 235     {
 236         /* Have to create a blob for most types, but not
 237          * for all.. arghh.
 238          */
 239         switch (hdr->propID)
 240         {
 241         case CERT_AUTO_ENROLL_PROP_ID:
 242         case CERT_CTL_USAGE_PROP_ID:
 243         case CERT_DESCRIPTION_PROP_ID:
 244         case CERT_FRIENDLY_NAME_PROP_ID:
 245         case CERT_HASH_PROP_ID:
 246         case CERT_KEY_IDENTIFIER_PROP_ID:
 247         case CERT_MD5_HASH_PROP_ID:
 248         case CERT_NEXT_UPDATE_LOCATION_PROP_ID:
 249         case CERT_PUBKEY_ALG_PARA_PROP_ID:
 250         case CERT_PVK_FILE_PROP_ID:
 251         case CERT_SIGNATURE_HASH_PROP_ID:
 252         case CERT_ISSUER_PUBLIC_KEY_MD5_HASH_PROP_ID:
 253         case CERT_SUBJECT_PUBLIC_KEY_MD5_HASH_PROP_ID:
 254         case CERT_ENROLLMENT_PROP_ID:
 255         case CERT_CROSS_CERT_DIST_POINTS_PROP_ID:
 256         case CERT_RENEWAL_PROP_ID:
 257         {
 258             CRYPT_DATA_BLOB blob = { hdr->cb,
 259              (LPBYTE)pbElement };
 260
 261             ret = contextInterface->setProp(context,
 262              hdr->propID, 0, &blob);
 263             break;
 264         }
 265         case CERT_DATE_STAMP_PROP_ID:
 266             ret = contextInterface->setProp(context,
 267              hdr->propID, 0, pbElement);
 268             break;
 269         case CERT_KEY_PROV_INFO_PROP_ID:
 270         {
 271             PCRYPT_KEY_PROV_INFO info =
 272              (PCRYPT_KEY_PROV_INFO)pbElement;
 273
 274             CRYPT_FixKeyProvInfoPointers(info);
 275             ret = contextInterface->setProp(context,
 276              hdr->propID, 0, pbElement);
 277             break;
 278         }
 279         default:
 280             ret = FALSE;
 281         }
 282     }
 283     else
 284     {
 285         /* ignore the context itself */
 286         ret = TRUE;
 287     }
 288     return ret;
 289 }
 290
 291 const void *CRYPT_ReadSerializedElement(const BYTE *pbElement, DWORD cbElement,
 292  DWORD dwContextTypeFlags, DWORD *pdwContentType)
 293 {
 294     const void *context;
 295
 296     TRACE("(%p, %d, %08x, %p)\n", pbElement, cbElement, dwContextTypeFlags,
 297      pdwContentType);
 298
 299     if (!cbElement)
 300     {
 301         SetLastError(ERROR_END_OF_MEDIA);
 302         return NULL;
 303     }
 304
 305     __TRY
 306     {
 307         const WINE_CONTEXT_INTERFACE *contextInterface = NULL;
 308         const WINE_CERT_PROP_HEADER *hdr = NULL;
 309         DWORD type = 0;
 310         BOOL ret;
 311
 312         ret = TRUE;
 313         context = NULL;
 314         if (dwContextTypeFlags == CERT_STORE_ALL_CONTEXT_FLAG)
 315         {
 316             hdr = CRYPT_findPropID(pbElement, cbElement, CERT_CERT_PROP_ID);
 317             if (hdr)
 318                 type = CERT_STORE_CERTIFICATE_CONTEXT;
 319             else
 320             {
 321                 hdr = CRYPT_findPropID(pbElement, cbElement, CERT_CRL_PROP_ID);
 322                 if (hdr)
 323                     type = CERT_STORE_CRL_CONTEXT;
 324                 else
 325                 {
 326                     hdr = CRYPT_findPropID(pbElement, cbElement,
 327                      CERT_CTL_PROP_ID);
 328                     if (hdr)
 329                         type = CERT_STORE_CTL_CONTEXT;
 330                 }
 331             }
 332         }
 333         else if (dwContextTypeFlags & CERT_STORE_CERTIFICATE_CONTEXT_FLAG)
 334         {
 335             hdr = CRYPT_findPropID(pbElement, cbElement, CERT_CERT_PROP_ID);
 336             type = CERT_STORE_CERTIFICATE_CONTEXT;
 337         }
 338         else if (dwContextTypeFlags & CERT_STORE_CRL_CONTEXT_FLAG)
 339         {
 340             hdr = CRYPT_findPropID(pbElement, cbElement, CERT_CRL_PROP_ID);
 341             type = CERT_STORE_CRL_CONTEXT;
 342         }
 343         else if (dwContextTypeFlags & CERT_STORE_CTL_CONTEXT_FLAG)
 344         {
 345             hdr = CRYPT_findPropID(pbElement, cbElement, CERT_CTL_PROP_ID);
 346             type = CERT_STORE_CTL_CONTEXT;
 347         }
 348
 349         switch (type)
 350         {
 351         case CERT_STORE_CERTIFICATE_CONTEXT:
 352             contextInterface = pCertInterface;
 353             break;
 354         case CERT_STORE_CRL_CONTEXT:
 355             contextInterface = pCRLInterface;
 356             break;
 357         case CERT_STORE_CTL_CONTEXT:
 358             contextInterface = pCTLInterface;
 359             break;
 360         default:
 361             SetLastError(E_INVALIDARG);
 362             ret = FALSE;
 363         }
 364         if (!hdr)
 365             ret = FALSE;
 366
 367         if (ret)
 368             context = contextInterface->create(X509_ASN_ENCODING,
 369              (BYTE *)hdr + sizeof(WINE_CERT_PROP_HEADER), hdr->cb);
 370         if (ret && context)
 371         {
 372             BOOL noMoreProps = FALSE;
 373
 374             while (!noMoreProps && ret)
 375             {
 376                 if (cbElement < sizeof(WINE_CERT_PROP_HEADER))
 377                     ret = FALSE;
 378                 else
 379                 {
 380                     const WINE_CERT_PROP_HEADER *hdr =
 381                      (const WINE_CERT_PROP_HEADER *)pbElement;
 382
 383                     TRACE("prop is %d\n", hdr->propID);
 384                     cbElement -= sizeof(WINE_CERT_PROP_HEADER);
 385                     pbElement += sizeof(WINE_CERT_PROP_HEADER);
 386                     if (!hdr->propID)
 387                     {
 388                         /* Like in CRYPT_findPropID, stop if the propID is zero
 389                          */
 390                         noMoreProps = TRUE;
 391                     }
 392                     else
 393                         ret = CRYPT_ReadContextProp(contextInterface, context,
 394                          hdr, pbElement, cbElement);
 395                     pbElement += hdr->cb;
 396                     cbElement -= hdr->cb;
 397                     if (!cbElement)
 398                         noMoreProps = TRUE;
 399                 }
 400             }
 401             if (ret)
 402             {
 403                 if (pdwContentType)
 404                     *pdwContentType = type;
 405             }
 406             else
 407             {
 408                 contextInterface->free(context);
 409                 context = NULL;
 410             }
 411         }
 412     }
 413     __EXCEPT_PAGE_FAULT
 414     {
 415         SetLastError(STATUS_ACCESS_VIOLATION);
 416         context = NULL;
 417     }
 418     __ENDTRY
 419     return context;
 420 }
 421
 422 static const BYTE fileHeader[] = { 0, 0, 0, 0, 'C','E','R','T' };
 423
 424 BOOL CRYPT_ReadSerializedFile(HANDLE file, HCERTSTORE store)
 425 {
 426     BYTE fileHeaderBuf[sizeof(fileHeader)];
 427     DWORD read;
 428     BOOL ret;
 429
 430     /* Failure reading is non-critical, we'll leave the store empty */
 431     ret = ReadFile(file, fileHeaderBuf, sizeof(fileHeaderBuf), &read, NULL);
 432     if (ret)
 433     {
 434         if (!memcmp(fileHeaderBuf, fileHeader, read))
 435         {
 436             WINE_CERT_PROP_HEADER propHdr;
 437             const void *context = NULL;
 438             const WINE_CONTEXT_INTERFACE *contextInterface = NULL;
 439             LPBYTE buf = NULL;
 440             DWORD bufSize = 0;
 441
 442             do {
 443                 ret = ReadFile(file, &propHdr, sizeof(propHdr), &read, NULL);
 444                 if (ret && read == sizeof(propHdr))
 445                 {
 446                     if (contextInterface && context &&
 447                      (propHdr.propID == CERT_CERT_PROP_ID ||
 448                      propHdr.propID == CERT_CRL_PROP_ID ||
 449                      propHdr.propID == CERT_CTL_PROP_ID))
 450                     {
 451                         /* We have a new context, so free the existing one */
 452                         contextInterface->free(context);
 453                     }
 454                     if (propHdr.cb > bufSize)
 455                     {
 456                         /* Not reusing realloc, because the old data aren't
 457                          * needed any longer.
 458                          */
 459                         CryptMemFree(buf);
 460                         buf = CryptMemAlloc(propHdr.cb);
 461                         bufSize = propHdr.cb;
 462                     }
 463                     if (buf)
 464                     {
 465                         ret = ReadFile(file, buf, propHdr.cb, &read, NULL);
 466                         if (ret && read == propHdr.cb)
 467                         {
 468                             if (propHdr.propID == CERT_CERT_PROP_ID)
 469                             {
 470                                 contextInterface = pCertInterface;
 471                                 ret = contextInterface->addEncodedToStore(store,
 472                                  X509_ASN_ENCODING, buf, read,
 473                                  CERT_STORE_ADD_NEW, &context);
 474                             }
 475                             else if (propHdr.propID == CERT_CRL_PROP_ID)
 476                             {
 477                                 contextInterface = pCRLInterface;
 478                                 ret = contextInterface->addEncodedToStore(store,
 479                                  X509_ASN_ENCODING, buf, read,
 480                                  CERT_STORE_ADD_NEW, &context);
 481                             }
 482                             else if (propHdr.propID == CERT_CTL_PROP_ID)
 483                             {
 484                                 contextInterface = pCTLInterface;
 485                                 ret = contextInterface->addEncodedToStore(store,
 486                                  X509_ASN_ENCODING, buf, read,
 487                                  CERT_STORE_ADD_NEW, &context);
 488                             }
 489                             else
 490                                 ret = CRYPT_ReadContextProp(contextInterface,
 491                                  context, &propHdr, buf, read);
 492                         }
 493                     }
 494                     else
 495                         ret = FALSE;
 496                 }
 497             } while (ret && read > 0);
 498             if (contextInterface && context)
 499             {
 500                 /* Free the last context added */
 501                 contextInterface->free(context);
 502             }
 503             CryptMemFree(buf);
 504             ret = TRUE;
 505         }
 506     }
 507     else
 508         ret = TRUE;
 509     return ret;
 510 }
 511
 512 static BOOL WINAPI CRYPT_SerializeCertNoHash(PCCERT_CONTEXT pCertContext,
 513  DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
 514 {
 515     return CRYPT_SerializeStoreElement(pCertContext,
 516      pCertContext->pbCertEncoded, pCertContext->cbCertEncoded,
 517      CERT_CERT_PROP_ID, pCertInterface, dwFlags, TRUE, pbElement, pcbElement);
 518 }
 519
 520 static BOOL WINAPI CRYPT_SerializeCRLNoHash(PCCRL_CONTEXT pCrlContext,
 521  DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
 522 {
 523     return CRYPT_SerializeStoreElement(pCrlContext,
 524      pCrlContext->pbCrlEncoded, pCrlContext->cbCrlEncoded,
 525      CERT_CRL_PROP_ID, pCRLInterface, dwFlags, TRUE, pbElement, pcbElement);
 526 }
 527
 528 static BOOL WINAPI CRYPT_SerializeCTLNoHash(PCCTL_CONTEXT pCtlContext,
 529  DWORD dwFlags, BYTE *pbElement, DWORD *pcbElement)
 530 {
 531     return CRYPT_SerializeStoreElement(pCtlContext,
 532      pCtlContext->pbCtlEncoded, pCtlContext->cbCtlEncoded,
 533      CERT_CTL_PROP_ID, pCTLInterface, dwFlags, TRUE, pbElement, pcbElement);
 534 }
 535
 536 static BOOL CRYPT_SerializeContextsToFile(HANDLE file,
 537  const WINE_CONTEXT_INTERFACE *contextInterface, HCERTSTORE store)
 538 {
 539     const void *context = NULL;
 540     BOOL ret;
 541
 542     do {
 543         context = contextInterface->enumContextsInStore(store, context);
 544         if (context)
 545         {
 546             DWORD size = 0;
 547             LPBYTE buf = NULL;
 548
 549             ret = contextInterface->serialize(context, 0, NULL, &size);
 550             if (size)
 551                 buf = CryptMemAlloc(size);
 552             if (buf)
 553             {
 554                 ret = contextInterface->serialize(context, 0, buf, &size);
 555                 if (ret)
 556                     ret = WriteFile(file, buf, size, &size, NULL);
 557             }
 558             CryptMemFree(buf);
 559         }
 560         else
 561             ret = TRUE;
 562     } while (ret && context != NULL);
 563     if (context)
 564         contextInterface->free(context);
 565     return ret;
 566 }
 567
 568 BOOL CRYPT_WriteSerializedFile(HANDLE file, HCERTSTORE store)
 569 {
 570     static const BYTE fileTrailer[12] = { 0 };
 571     WINE_CONTEXT_INTERFACE interface;
 572     BOOL ret;
 573     DWORD size;
 574
 575     SetFilePointer(file, 0, NULL, FILE_BEGIN);
 576     ret = WriteFile(file, fileHeader, sizeof(fileHeader), &size, NULL);
 577     if (ret)
 578     {
 579         memcpy(&interface, pCertInterface, sizeof(interface));
 580         interface.serialize = (SerializeElementFunc)CRYPT_SerializeCertNoHash;
 581         ret = CRYPT_SerializeContextsToFile(file, &interface, store);
 582     }
 583     if (ret)
 584     {
 585         memcpy(&interface, pCRLInterface, sizeof(interface));
 586         interface.serialize = (SerializeElementFunc)CRYPT_SerializeCRLNoHash;
 587         ret = CRYPT_SerializeContextsToFile(file, &interface, store);
 588     }
 589     if (ret)
 590     {
 591         memcpy(&interface, pCTLInterface, sizeof(interface));
 592         interface.serialize = (SerializeElementFunc)CRYPT_SerializeCTLNoHash;
 593         ret = CRYPT_SerializeContextsToFile(file, &interface, store);
 594     }
 595     if (ret)
 596         ret = WriteFile(file, fileTrailer, sizeof(fileTrailer), &size, NULL);
 597     return ret;
 598 }
 599
 600 BOOL WINAPI CertAddSerializedElementToStore(HCERTSTORE hCertStore,
 601  const BYTE *pbElement, DWORD cbElement, DWORD dwAddDisposition, DWORD dwFlags,
 602  DWORD dwContextTypeFlags, DWORD *pdwContentType, const void **ppvContext)
 603 {
 604     const void *context;
 605     DWORD type;
 606     BOOL ret;
 607
 608     TRACE("(%p, %p, %d, %08x, %08x, %08x, %p, %p)\n", hCertStore,
 609      pbElement, cbElement, dwAddDisposition, dwFlags, dwContextTypeFlags,
 610      pdwContentType, ppvContext);
 611
 612     /* Call the internal function, then delete the hashes.  Tests show this
 613      * function uses real hash values, not whatever's stored in the hash
 614      * property.
 615      */
 616     context = CRYPT_ReadSerializedElement(pbElement, cbElement,
 617      dwContextTypeFlags, &type);
 618     if (context)
 619     {
 620         const WINE_CONTEXT_INTERFACE *contextInterface = NULL;
 621
 622         switch (type)
 623         {
 624         case CERT_STORE_CERTIFICATE_CONTEXT:
 625             contextInterface = pCertInterface;
 626             break;
 627         case CERT_STORE_CRL_CONTEXT:
 628             contextInterface = pCRLInterface;
 629             break;
 630         case CERT_STORE_CTL_CONTEXT:
 631             contextInterface = pCTLInterface;
 632             break;
 633         default:
 634             SetLastError(E_INVALIDARG);
 635         }
 636         if (contextInterface)
 637         {
 638             contextInterface->setProp(context, CERT_HASH_PROP_ID, 0, NULL);
 639             contextInterface->setProp(context, CERT_MD5_HASH_PROP_ID, 0, NULL);
 640             contextInterface->setProp(context, CERT_SIGNATURE_HASH_PROP_ID, 0,
 641              NULL);
 642             if (pdwContentType)
 643                 *pdwContentType = type;
 644             ret = contextInterface->addContextToStore(hCertStore, context,
 645              dwAddDisposition, ppvContext);
 646             contextInterface->free(context);
 647         }
 648         else
 649             ret = FALSE;
 650     }
 651     else
 652         ret = FALSE;
 653     return ret;
 654 }