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

   1 /*
   2  * Copyright 2005 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  * This file implements ASN.1 DER decoding of a limited set of types.
  19  * It isn't a full ASN.1 implementation.  Microsoft implements BER
  20  * encoding of many of the basic types in msasn1.dll, but that interface is
  21  * undocumented, so I implement them here.
  22  *
  23  * References:
  24  * "A Layman's Guide to a Subset of ASN.1, BER, and DER", by Burton Kaliski
  25  * (available online, look for a PDF copy as the HTML versions tend to have
  26  * translation errors.)
  27  *
  28  * RFC3280, http://www.faqs.org/rfcs/rfc3280.html
  29  *
  30  * MSDN, especially:
  31  * http://msdn.microsoft.com/library/en-us/seccrypto/security/constants_for_cryptencodeobject_and_cryptdecodeobject.asp
  32  */
  33
  34 #include <assert.h>
  35 #include <stdarg.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38
  39 #define NONAMELESSUNION
  40
  41 #include "windef.h"
  42 #include "winbase.h"
  43 #include "excpt.h"
  44 #include "wincrypt.h"
  45 #include "winreg.h"
  46 #include "snmp.h"
  47 #include "wine/debug.h"
  48 #include "wine/exception.h"
  49 #include "crypt32_private.h"
  50
  51 /* This is a bit arbitrary, but to set some limit: */
  52 #define MAX_ENCODED_LEN 0x02000000
  53
  54 #define ASN_FLAGS_MASK 0xe0
  55 #define ASN_TYPE_MASK  0x1f
  56
  57 WINE_DEFAULT_DEBUG_CHANNEL(crypt);
  58
  59 struct GenericArray
  60 {
  61     DWORD cItems;
  62     BYTE *rgItems;
  63 };
  64
  65 typedef BOOL (WINAPI *CryptDecodeObjectFunc)(DWORD, LPCSTR, const BYTE *,
  66  DWORD, DWORD, void *, DWORD *);
  67 typedef BOOL (WINAPI *CryptDecodeObjectExFunc)(DWORD, LPCSTR, const BYTE *,
  68  DWORD, DWORD, PCRYPT_DECODE_PARA, void *, DWORD *);
  69
  70 /* Prototypes for built-in decoders.  They follow the Ex style prototypes.
  71  * The dwCertEncodingType and lpszStructType are ignored by the built-in
  72  * functions, but the parameters are retained to simplify CryptDecodeObjectEx,
  73  * since it must call functions in external DLLs that follow these signatures.
  74  */
  75 static BOOL WINAPI CRYPT_AsnDecodeChoiceOfTime(DWORD dwCertEncodingType,
  76  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
  77  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
  78 static BOOL WINAPI CRYPT_AsnDecodePubKeyInfoInternal(DWORD dwCertEncodingType,
  79  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
  80  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
  81 /* Like CRYPT_AsnDecodeExtensions, except assumes rgExtension is set ahead of
  82  * time, doesn't do memory allocation, and doesn't do exception handling.
  83  * (This isn't intended to be the externally-called one.)
  84  */
  85 static BOOL WINAPI CRYPT_AsnDecodeExtensionsInternal(DWORD dwCertEncodingType,
  86  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
  87  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
  88 /* Assumes algo->Parameters.pbData is set ahead of time.  Internal func. */
  89 static BOOL WINAPI CRYPT_AsnDecodeAlgorithmId(DWORD dwCertEncodingType,
  90  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
  91  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
  92 /* Internal function */
  93 static BOOL WINAPI CRYPT_AsnDecodeBool(DWORD dwCertEncodingType,
  94  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
  95  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
  96 /* Assumes the CRYPT_DATA_BLOB's pbData member has been initialized */
  97 static BOOL WINAPI CRYPT_AsnDecodeOctetsInternal(DWORD dwCertEncodingType,
  98  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
  99  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
 100 /* Like CRYPT_AsnDecodeBits, but assumes the CRYPT_INTEGER_BLOB's pbData
 101  * member has been initialized, doesn't do exception handling, and doesn't do
 102  * memory allocation.
 103  */
 104 static BOOL WINAPI CRYPT_AsnDecodeBitsInternal(DWORD dwCertEncodingType,
 105  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 106  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
 107 static BOOL WINAPI CRYPT_AsnDecodeBits(DWORD dwCertEncodingType,
 108  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 109  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
 110 static BOOL WINAPI CRYPT_AsnDecodeInt(DWORD dwCertEncodingType,
 111  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 112  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
 113 /* Like CRYPT_AsnDecodeInteger, but assumes the CRYPT_INTEGER_BLOB's pbData
 114  * member has been initialized, doesn't do exception handling, and doesn't do
 115  * memory allocation.
 116  */
 117 static BOOL WINAPI CRYPT_AsnDecodeIntegerInternal(DWORD dwCertEncodingType,
 118  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 119  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
 120 /* Like CRYPT_AsnDecodeInteger, but unsigned.  */
 121 static BOOL WINAPI CRYPT_AsnDecodeUnsignedIntegerInternal(
 122  DWORD dwCertEncodingType, LPCSTR lpszStructType, const BYTE *pbEncoded,
 123  DWORD cbEncoded, DWORD dwFlags, PCRYPT_DECODE_PARA pDecodePara,
 124  void *pvStructInfo, DWORD *pcbStructInfo);
 125
 126 BOOL WINAPI CryptDecodeObject(DWORD dwCertEncodingType, LPCSTR lpszStructType,
 127  const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags, void *pvStructInfo,
 128  DWORD *pcbStructInfo)
 129 {
 130     static HCRYPTOIDFUNCSET set = NULL;
 131     BOOL ret = FALSE;
 132     CryptDecodeObjectFunc pCryptDecodeObject;
 133     HCRYPTOIDFUNCADDR hFunc;
 134
 135     TRACE("(0x%08lx, %s, %p, %ld, 0x%08lx, %p, %p)\n", dwCertEncodingType,
 136      debugstr_a(lpszStructType), pbEncoded, cbEncoded, dwFlags,
 137      pvStructInfo, pcbStructInfo);
 138
 139     if (!pvStructInfo && !pcbStructInfo)
 140     {
 141         SetLastError(ERROR_INVALID_PARAMETER);
 142         return FALSE;
 143     }
 144
 145     /* Try registered DLL first.. */
 146     if (!set)
 147         set = CryptInitOIDFunctionSet(CRYPT_OID_DECODE_OBJECT_FUNC, 0);
 148     CryptGetOIDFunctionAddress(set, dwCertEncodingType, lpszStructType, 0,
 149      (void **)&pCryptDecodeObject, &hFunc);
 150     if (pCryptDecodeObject)
 151     {
 152         ret = pCryptDecodeObject(dwCertEncodingType, lpszStructType,
 153          pbEncoded, cbEncoded, dwFlags, pvStructInfo, pcbStructInfo);
 154         CryptFreeOIDFunctionAddress(hFunc, 0);
 155     }
 156     else
 157     {
 158         /* If not, use CryptDecodeObjectEx */
 159         ret = CryptDecodeObjectEx(dwCertEncodingType, lpszStructType, pbEncoded,
 160          cbEncoded, dwFlags, NULL, pvStructInfo, pcbStructInfo);
 161     }
 162     return ret;
 163 }
 164
 165 /* Gets the number of length bytes from the given (leading) length byte */
 166 #define GET_LEN_BYTES(b) ((b) <= 0x7f ? 1 : 1 + ((b) & 0x7f))
 167
 168 /* Helper function to get the encoded length of the data starting at pbEncoded,
 169  * where pbEncoded[0] is the tag.  If the data are too short to contain a
 170  * length or if the length is too large for cbEncoded, sets an appropriate
 171  * error code and returns FALSE.
 172  */
 173 static BOOL WINAPI CRYPT_GetLen(const BYTE *pbEncoded, DWORD cbEncoded,
 174  DWORD *len)
 175 {
 176     BOOL ret;
 177
 178     if (cbEncoded <= 1)
 179     {
 180         SetLastError(CRYPT_E_ASN1_CORRUPT);
 181         ret = FALSE;
 182     }
 183     else if (pbEncoded[1] <= 0x7f)
 184     {
 185         if (pbEncoded[1] + 1 > cbEncoded)
 186         {
 187             SetLastError(CRYPT_E_ASN1_EOD);
 188             ret = FALSE;
 189         }
 190         else
 191         {
 192             *len = pbEncoded[1];
 193             ret = TRUE;
 194         }
 195     }
 196     else
 197     {
 198         BYTE lenLen = GET_LEN_BYTES(pbEncoded[1]);
 199
 200         if (lenLen > sizeof(DWORD) + 1)
 201         {
 202             SetLastError(CRYPT_E_ASN1_LARGE);
 203             ret = FALSE;
 204         }
 205         else if (lenLen + 2 > cbEncoded)
 206         {
 207             SetLastError(CRYPT_E_ASN1_CORRUPT);
 208             ret = FALSE;
 209         }
 210         else
 211         {
 212             DWORD out = 0;
 213
 214             pbEncoded += 2;
 215             while (--lenLen)
 216             {
 217                 out <<= 8;
 218                 out |= *pbEncoded++;
 219             }
 220             if (out + lenLen + 1 > cbEncoded)
 221             {
 222                 SetLastError(CRYPT_E_ASN1_EOD);
 223                 ret = FALSE;
 224             }
 225             else
 226             {
 227                 *len = out;
 228                 ret = TRUE;
 229             }
 230         }
 231     }
 232     return ret;
 233 }
 234
 235 /* Helper function to check *pcbStructInfo, set it to the required size, and
 236  * optionally to allocate memory.  Assumes pvStructInfo is not NULL.
 237  * If CRYPT_DECODE_ALLOC_FLAG is set in dwFlags, *pvStructInfo will be set to a
 238  * pointer to the newly allocated memory.
 239  */
 240 static BOOL CRYPT_DecodeEnsureSpace(DWORD dwFlags,
 241  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo,
 242  DWORD bytesNeeded)
 243 {
 244     BOOL ret = TRUE;
 245
 246     if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
 247     {
 248         if (pDecodePara && pDecodePara->pfnAlloc)
 249             *(BYTE **)pvStructInfo = pDecodePara->pfnAlloc(bytesNeeded);
 250         else
 251             *(BYTE **)pvStructInfo = LocalAlloc(0, bytesNeeded);
 252         if (!*(BYTE **)pvStructInfo)
 253             ret = FALSE;
 254         else
 255             *pcbStructInfo = bytesNeeded;
 256     }
 257     else if (*pcbStructInfo < bytesNeeded)
 258     {
 259         *pcbStructInfo = bytesNeeded;
 260         SetLastError(ERROR_MORE_DATA);
 261         ret = FALSE;
 262     }
 263     return ret;
 264 }
 265
 266 /* tag:
 267  *     The expected tag of the item.  If tag is 0, decodeFunc is called
 268  *     regardless of the tag value seen.
 269  * offset:
 270  *     A sequence is decoded into a struct.  The offset member is the
 271  *     offset of this item within that struct.
 272  * decodeFunc:
 273  *     The decoder function to use.  If this is NULL, then the member isn't
 274  *     decoded, but minSize space is reserved for it.
 275  * minSize:
 276  *     The minimum amount of space occupied after decoding.  You must set this.
 277  * optional:
 278  *     If true, and the tag doesn't match the expected tag for this item,
 279  *     or the decodeFunc fails with CRYPT_E_ASN1_BADTAG, then minSize space is
 280  *     filled with 0 for this member.
 281  * hasPointer, pointerOffset, minSize:
 282  *     If the item has dynamic data, set hasPointer to TRUE, pointerOffset to
 283  *     the offset within the (outer) struct of the data pointer (or to the
 284  *     first data pointer, if more than one exist).
 285  * size:
 286  *     Used by CRYPT_AsnDecodeSequence, not for your use.
 287  */
 288 struct AsnDecodeSequenceItem
 289 {
 290     BYTE                    tag;
 291     DWORD                   offset;
 292     CryptDecodeObjectExFunc decodeFunc;
 293     DWORD                   minSize;
 294     BOOL                    optional;
 295     BOOL                    hasPointer;
 296     DWORD                   pointerOffset;
 297     DWORD                   size;
 298 };
 299
 300 static BOOL CRYPT_AsnDecodeSequenceItems(DWORD dwCertEncodingType,
 301  struct AsnDecodeSequenceItem items[], DWORD cItem, const BYTE *pbEncoded,
 302  DWORD cbEncoded, DWORD dwFlags, void *pvStructInfo, BYTE *nextData)
 303 {
 304     BOOL ret;
 305     DWORD i;
 306     const BYTE *ptr;
 307
 308     ptr = pbEncoded + 1 + GET_LEN_BYTES(pbEncoded[1]);
 309     for (i = 0, ret = TRUE; ret && i < cItem; i++)
 310     {
 311         if (cbEncoded - (ptr - pbEncoded) != 0)
 312         {
 313             DWORD nextItemLen;
 314
 315             if ((ret = CRYPT_GetLen(ptr, cbEncoded - (ptr - pbEncoded),
 316              &nextItemLen)))
 317             {
 318                 BYTE nextItemLenBytes = GET_LEN_BYTES(ptr[1]);
 319
 320                 if (ptr[0] == items[i].tag || !items[i].tag)
 321                 {
 322                     if (nextData && pvStructInfo && items[i].hasPointer)
 323                     {
 324                         TRACE("Setting next pointer to %p\n",
 325                          nextData);
 326                         *(BYTE **)((BYTE *)pvStructInfo +
 327                          items[i].pointerOffset) = nextData;
 328                     }
 329                     if (items[i].decodeFunc)
 330                     {
 331                         if (pvStructInfo)
 332                             TRACE("decoding item %ld\n", i);
 333                         else
 334                             TRACE("sizing item %ld\n", i);
 335                         ret = items[i].decodeFunc(dwCertEncodingType,
 336                          NULL, ptr, 1 + nextItemLenBytes + nextItemLen,
 337                          dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL,
 338                          pvStructInfo ?  (BYTE *)pvStructInfo + items[i].offset
 339                          : NULL, &items[i].size);
 340                         if (ret)
 341                         {
 342                             if (nextData && items[i].hasPointer &&
 343                              items[i].size > items[i].minSize)
 344                             {
 345                                 nextData += items[i].size - items[i].minSize;
 346                                 /* align nextData to DWORD boundaries */
 347                                 if (items[i].size % sizeof(DWORD))
 348                                     nextData += sizeof(DWORD) - items[i].size %
 349                                      sizeof(DWORD);
 350                             }
 351                             /* Account for alignment padding */
 352                             if (items[i].size % sizeof(DWORD))
 353                                 items[i].size += sizeof(DWORD) -
 354                                  items[i].size % sizeof(DWORD);
 355                             ptr += 1 + nextItemLenBytes + nextItemLen;
 356                         }
 357                         else if (items[i].optional &&
 358                          GetLastError() == CRYPT_E_ASN1_BADTAG)
 359                         {
 360                             TRACE("skipping optional item %ld\n", i);
 361                             items[i].size = items[i].minSize;
 362                             SetLastError(NOERROR);
 363                             ret = TRUE;
 364                         }
 365                         else
 366                             TRACE("item %ld failed: %08lx\n", i,
 367                              GetLastError());
 368                     }
 369                     else
 370                         items[i].size = items[i].minSize;
 371                 }
 372                 else if (items[i].optional)
 373                 {
 374                     TRACE("skipping optional item %ld\n", i);
 375                     items[i].size = items[i].minSize;
 376                 }
 377                 else
 378                 {
 379                     TRACE("tag %02x doesn't match expected %02x\n",
 380                      ptr[0], items[i].tag);
 381                     SetLastError(CRYPT_E_ASN1_BADTAG);
 382                     ret = FALSE;
 383                 }
 384             }
 385         }
 386         else if (items[i].optional)
 387         {
 388             TRACE("missing optional item %ld, skipping\n", i);
 389             items[i].size = items[i].minSize;
 390         }
 391         else
 392         {
 393             TRACE("not enough bytes for item %ld, failing\n", i);
 394             SetLastError(CRYPT_E_ASN1_CORRUPT);
 395             ret = FALSE;
 396         }
 397     }
 398     if (cbEncoded - (ptr - pbEncoded) != 0)
 399     {
 400         TRACE("%ld remaining bytes, failing\n", cbEncoded -
 401          (ptr - pbEncoded));
 402         SetLastError(CRYPT_E_ASN1_CORRUPT);
 403         ret = FALSE;
 404     }
 405     return ret;
 406 }
 407
 408 /* This decodes an arbitrary sequence into a contiguous block of memory
 409  * (basically, a struct.)  Each element being decoded is described by a struct
 410  * AsnDecodeSequenceItem, see above.
 411  * startingPointer is an optional pointer to the first place where dynamic
 412  * data will be stored.  If you know the starting offset, you may pass it
 413  * here.  Otherwise, pass NULL, and one will be inferred from the items.
 414  * Each item decoder is never called with CRYPT_DECODE_ALLOC_FLAG set.
 415  * If any undecoded data are left over, fails with CRYPT_E_ASN1_CORRUPT.
 416  */
 417 static BOOL CRYPT_AsnDecodeSequence(DWORD dwCertEncodingType,
 418  struct AsnDecodeSequenceItem items[], DWORD cItem, const BYTE *pbEncoded,
 419  DWORD cbEncoded, DWORD dwFlags, PCRYPT_DECODE_PARA pDecodePara,
 420  void *pvStructInfo, DWORD *pcbStructInfo, void *startingPointer)
 421 {
 422     BOOL ret;
 423
 424     TRACE("%p, %ld, %p, %ld, %08lx, %p, %p, %ld, %p\n", items, cItem, pbEncoded,
 425      cbEncoded, dwFlags, pDecodePara, pvStructInfo, *pcbStructInfo,
 426      startingPointer);
 427
 428     if (pbEncoded[0] == ASN_SEQUENCE)
 429     {
 430         DWORD dataLen;
 431
 432         if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
 433         {
 434             DWORD i;
 435
 436             ret = CRYPT_AsnDecodeSequenceItems(dwFlags, items, cItem, pbEncoded,
 437              cbEncoded, dwFlags, NULL, NULL);
 438             if (ret)
 439             {
 440                 DWORD bytesNeeded = 0, structSize = 0;
 441
 442                 for (i = 0; i < cItem; i++)
 443                 {
 444                     bytesNeeded += items[i].size;
 445                     structSize += items[i].minSize;
 446                 }
 447                 if (!pvStructInfo)
 448                     *pcbStructInfo = bytesNeeded;
 449                 else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags,
 450                  pDecodePara, pvStructInfo, pcbStructInfo, bytesNeeded)))
 451                 {
 452                     BYTE *nextData;
 453
 454                     if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
 455                         pvStructInfo = *(BYTE **)pvStructInfo;
 456                     if (startingPointer)
 457                         nextData = (BYTE *)startingPointer;
 458                     else
 459                         nextData = (BYTE *)pvStructInfo + structSize;
 460                     memset(pvStructInfo, 0, structSize);
 461                     ret = CRYPT_AsnDecodeSequenceItems(dwFlags, items, cItem,
 462                      pbEncoded, cbEncoded, dwFlags, pvStructInfo, nextData);
 463                 }
 464             }
 465         }
 466     }
 467     else
 468     {
 469         SetLastError(CRYPT_E_ASN1_BADTAG);
 470         ret = FALSE;
 471     }
 472     TRACE("returning %d (%08lx)\n", ret, GetLastError());
 473     return ret;
 474 }
 475
 476 /* tag:
 477  *     The expected tag of the entire encoded array (usually a variant
 478  *     of ASN_SETOF or ASN_SEQUENCEOF.)
 479  * decodeFunc:
 480  *     used to decode each item in the array
 481  * itemSize:
 482  *      is the minimum size of each decoded item
 483  * hasPointer:
 484  *      indicates whether each item has a dynamic pointer
 485  * pointerOffset:
 486  *     indicates the offset within itemSize at which the pointer exists
 487  */
 488 struct AsnArrayDescriptor
 489 {
 490     BYTE                    tag;
 491     CryptDecodeObjectExFunc decodeFunc;
 492     DWORD                   itemSize;
 493     BOOL                    hasPointer;
 494     DWORD                   pointerOffset;
 495 };
 496
 497 struct AsnArrayItemSize
 498 {
 499     DWORD encodedLen;
 500     DWORD size;
 501 };
 502
 503 /* Decodes an array of like types into a struct GenericArray.
 504  * The layout and decoding of the array are described by a struct
 505  * AsnArrayDescriptor.
 506  */
 507 static BOOL CRYPT_AsnDecodeArray(const struct AsnArrayDescriptor *arrayDesc,
 508  const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 509  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo,
 510  void *startingPointer)
 511 {
 512     BOOL ret = TRUE;
 513
 514     TRACE("%p, %p, %ld, %08lx, %p, %p, %ld, %p\n", arrayDesc, pbEncoded,
 515      cbEncoded, dwFlags, pDecodePara, pvStructInfo, *pcbStructInfo,
 516      startingPointer);
 517
 518     if (pbEncoded[0] == arrayDesc->tag)
 519     {
 520         DWORD dataLen;
 521
 522         if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
 523         {
 524             DWORD bytesNeeded, cItems = 0;
 525             BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
 526             /* There can be arbitrarily many items, but there is often only one.
 527              */
 528             struct AsnArrayItemSize itemSize = { 0 }, *itemSizes = &itemSize;
 529
 530             bytesNeeded = sizeof(struct GenericArray);
 531             if (dataLen)
 532             {
 533                 const BYTE *ptr;
 534
 535                 for (ptr = pbEncoded + 1 + lenBytes; ret &&
 536                  ptr - pbEncoded - 1 - lenBytes < dataLen; )
 537                 {
 538                     DWORD itemLenBytes, itemDataLen, size;
 539
 540                     itemLenBytes = GET_LEN_BYTES(ptr[1]);
 541                     /* Each item decoded may not tolerate extraneous bytes, so
 542                      * get the length of the next element and pass it directly.
 543                      */
 544                     ret = CRYPT_GetLen(ptr, cbEncoded - (ptr - pbEncoded),
 545                      &itemDataLen);
 546                     if (ret)
 547                         ret = arrayDesc->decodeFunc(X509_ASN_ENCODING, 0, ptr,
 548                          1 + itemLenBytes + itemDataLen,
 549                          dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL,
 550                          &size);
 551                     if (ret)
 552                     {
 553                         DWORD nextLen;
 554
 555                         cItems++;
 556                         if (itemSizes != &itemSize)
 557                             itemSizes = CryptMemRealloc(itemSizes,
 558                              cItems * sizeof(struct AsnArrayItemSize));
 559                         else
 560                         {
 561                             itemSizes =
 562                              CryptMemAlloc(
 563                              cItems * sizeof(struct AsnArrayItemSize));
 564                             memcpy(itemSizes, &itemSize, sizeof(itemSize));
 565                         }
 566                         if (itemSizes)
 567                         {
 568                             itemSizes[cItems - 1].encodedLen = 1 + itemLenBytes
 569                              + itemDataLen;
 570                             itemSizes[cItems - 1].size = size;
 571                             bytesNeeded += size;
 572                             ret = CRYPT_GetLen(ptr,
 573                              cbEncoded - (ptr - pbEncoded), &nextLen);
 574                             if (ret)
 575                                 ptr += nextLen + 1 + GET_LEN_BYTES(ptr[1]);
 576                         }
 577                         else
 578                             ret = FALSE;
 579                     }
 580                 }
 581             }
 582             if (ret)
 583             {
 584                 if (!pvStructInfo)
 585                     *pcbStructInfo = bytesNeeded;
 586                 else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags,
 587                  pDecodePara, pvStructInfo, pcbStructInfo, bytesNeeded)))
 588                 {
 589                     DWORD i;
 590                     BYTE *nextData;
 591                     const BYTE *ptr;
 592                     struct GenericArray *array;
 593
 594                     if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
 595                         pvStructInfo = *(BYTE **)pvStructInfo;
 596                     array = (struct GenericArray *)pvStructInfo;
 597                     array->cItems = cItems;
 598                     if (startingPointer)
 599                         array->rgItems = startingPointer;
 600                     else
 601                         array->rgItems = (BYTE *)array +
 602                          sizeof(struct GenericArray);
 603                     nextData = (BYTE *)array->rgItems +
 604                      array->cItems * arrayDesc->itemSize;
 605                     for (i = 0, ptr = pbEncoded + 1 + lenBytes; ret &&
 606                      i < cItems && ptr - pbEncoded - 1 - lenBytes <
 607                      dataLen; i++)
 608                     {
 609                         if (arrayDesc->hasPointer)
 610                             *(BYTE **)(array->rgItems + i * arrayDesc->itemSize
 611                              + arrayDesc->pointerOffset) = nextData;
 612                         ret = arrayDesc->decodeFunc(X509_ASN_ENCODING, 0, ptr,
 613                          itemSizes[i].encodedLen,
 614                          dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL,
 615                          array->rgItems + i * arrayDesc->itemSize,
 616                          &itemSizes[i].size);
 617                         if (ret)
 618                         {
 619                             DWORD nextLen;
 620
 621                             nextData += itemSizes[i].size - arrayDesc->itemSize;
 622                             ret = CRYPT_GetLen(ptr,
 623                              cbEncoded - (ptr - pbEncoded), &nextLen);
 624                             if (ret)
 625                                 ptr += nextLen + 1 + GET_LEN_BYTES(ptr[1]);
 626                         }
 627                     }
 628                 }
 629             }
 630             if (itemSizes != &itemSize)
 631                 CryptMemFree(itemSizes);
 632         }
 633     }
 634     else
 635     {
 636         SetLastError(CRYPT_E_ASN1_BADTAG);
 637         ret = FALSE;
 638     }
 639     return ret;
 640 }
 641
 642 /* Decodes a DER-encoded BLOB into a CRYPT_DER_BLOB struct pointed to by
 643  * pvStructInfo.  The BLOB must be non-empty, otherwise the last error is set
 644  * to CRYPT_E_ASN1_CORRUPT.
 645  * Warning: assumes the CRYPT_DER_BLOB pointed to by pvStructInfo has pbData
 646  * set!
 647  */
 648 static BOOL WINAPI CRYPT_AsnDecodeDerBlob(DWORD dwCertEncodingType,
 649  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 650  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 651 {
 652     BOOL ret;
 653     DWORD dataLen;
 654
 655     if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
 656     {
 657         BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
 658         DWORD bytesNeeded = sizeof(CRYPT_DER_BLOB);
 659
 660         if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
 661             bytesNeeded += 1 + lenBytes + dataLen;
 662
 663         if (!pvStructInfo)
 664             *pcbStructInfo = bytesNeeded;
 665         else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
 666          pvStructInfo, pcbStructInfo, bytesNeeded)))
 667         {
 668             CRYPT_DER_BLOB *blob;
 669
 670             if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
 671                 pvStructInfo = *(BYTE **)pvStructInfo;
 672             blob = (CRYPT_DER_BLOB *)pvStructInfo;
 673             blob->cbData = 1 + lenBytes + dataLen;
 674             if (blob->cbData)
 675             {
 676                 if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
 677                     blob->pbData = (BYTE *)pbEncoded;
 678                 else
 679                 {
 680                     assert(blob->pbData);
 681                     memcpy(blob->pbData, pbEncoded, blob->cbData);
 682                 }
 683             }
 684             else
 685             {
 686                 SetLastError(CRYPT_E_ASN1_CORRUPT);
 687                 ret = FALSE;
 688             }
 689         }
 690     }
 691     return ret;
 692 }
 693
 694 /* Like CRYPT_AsnDecodeBitsInternal, but swaps the bytes */
 695 static BOOL WINAPI CRYPT_AsnDecodeBitsSwapBytes(DWORD dwCertEncodingType,
 696  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 697  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 698 {
 699     BOOL ret;
 700
 701     TRACE("(%p, %ld, 0x%08lx, %p, %p, %ld)\n", pbEncoded, cbEncoded, dwFlags,
 702      pDecodePara, pvStructInfo, *pcbStructInfo);
 703
 704     /* Can't use the CRYPT_DECODE_NOCOPY_FLAG, because we modify the bytes in-
 705      * place.
 706      */
 707     ret = CRYPT_AsnDecodeBitsInternal(dwCertEncodingType, lpszStructType,
 708      pbEncoded, cbEncoded, dwFlags & ~CRYPT_DECODE_NOCOPY_FLAG, pDecodePara,
 709      pvStructInfo, pcbStructInfo);
 710     if (ret && pvStructInfo)
 711     {
 712         CRYPT_BIT_BLOB *blob = (CRYPT_BIT_BLOB *)pvStructInfo;
 713
 714         if (blob->cbData)
 715         {
 716             DWORD i;
 717             BYTE temp;
 718
 719             for (i = 0; i < blob->cbData / 2; i++)
 720             {
 721                 temp = blob->pbData[i];
 722                 blob->pbData[i] = blob->pbData[blob->cbData - i - 1];
 723                 blob->pbData[blob->cbData - i - 1] = temp;
 724             }
 725         }
 726     }
 727     TRACE("returning %d (%08lx)\n", ret, GetLastError());
 728     return ret;
 729 }
 730
 731 static BOOL WINAPI CRYPT_AsnDecodeCert(DWORD dwCertEncodingType,
 732  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 733  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 734 {
 735     BOOL ret = TRUE;
 736
 737     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
 738      pDecodePara, pvStructInfo, *pcbStructInfo);
 739
 740     __TRY
 741     {
 742         struct AsnDecodeSequenceItem items[] = {
 743          { 0, offsetof(CERT_SIGNED_CONTENT_INFO, ToBeSigned),
 744            CRYPT_AsnDecodeDerBlob, sizeof(CRYPT_DER_BLOB), FALSE, TRUE,
 745            offsetof(CERT_SIGNED_CONTENT_INFO, ToBeSigned.pbData), 0 },
 746          { ASN_SEQUENCEOF, offsetof(CERT_SIGNED_CONTENT_INFO,
 747            SignatureAlgorithm), CRYPT_AsnDecodeAlgorithmId,
 748            sizeof(CRYPT_ALGORITHM_IDENTIFIER), FALSE, TRUE,
 749            offsetof(CERT_SIGNED_CONTENT_INFO, SignatureAlgorithm.pszObjId), 0 },
 750          { ASN_BITSTRING, offsetof(CERT_SIGNED_CONTENT_INFO, Signature),
 751            CRYPT_AsnDecodeBitsSwapBytes, sizeof(CRYPT_BIT_BLOB), FALSE, TRUE,
 752            offsetof(CERT_SIGNED_CONTENT_INFO, Signature.pbData), 0 },
 753         };
 754
 755         if (dwFlags & CRYPT_DECODE_NO_SIGNATURE_BYTE_REVERSAL_FLAG)
 756             items[2].decodeFunc = CRYPT_AsnDecodeBitsInternal;
 757         ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
 758          sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
 759          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
 760     }
 761     __EXCEPT_PAGE_FAULT
 762     {
 763         SetLastError(STATUS_ACCESS_VIOLATION);
 764         ret = FALSE;
 765     }
 766     __ENDTRY
 767     return ret;
 768 }
 769
 770 /* Internal function */
 771 static BOOL WINAPI CRYPT_AsnDecodeCertVersion(DWORD dwCertEncodingType,
 772  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 773  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 774 {
 775     BOOL ret;
 776     DWORD dataLen;
 777
 778     if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
 779     {
 780         BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
 781
 782         ret = CRYPT_AsnDecodeInt(dwCertEncodingType, X509_INTEGER,
 783          pbEncoded + 1 + lenBytes, dataLen, dwFlags, pDecodePara,
 784          pvStructInfo, pcbStructInfo);
 785     }
 786     return ret;
 787 }
 788
 789 static BOOL WINAPI CRYPT_AsnDecodeValidity(DWORD dwCertEncodingType,
 790  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 791  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 792 {
 793     BOOL ret;
 794
 795     struct AsnDecodeSequenceItem items[] = {
 796      { 0, offsetof(CERT_PRIVATE_KEY_VALIDITY, NotBefore),
 797        CRYPT_AsnDecodeChoiceOfTime, sizeof(FILETIME), FALSE, FALSE, 0 },
 798      { 0, offsetof(CERT_PRIVATE_KEY_VALIDITY, NotAfter),
 799        CRYPT_AsnDecodeChoiceOfTime, sizeof(FILETIME), FALSE, FALSE, 0 },
 800     };
 801
 802     ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
 803      sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
 804      pDecodePara, pvStructInfo, pcbStructInfo, NULL);
 805     return ret;
 806 }
 807
 808 /* Internal function */
 809 static BOOL WINAPI CRYPT_AsnDecodeCertExtensions(DWORD dwCertEncodingType,
 810  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 811  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 812 {
 813     BOOL ret;
 814     DWORD dataLen;
 815
 816     if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
 817     {
 818         BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
 819
 820         ret = CRYPT_AsnDecodeExtensionsInternal(dwCertEncodingType,
 821          X509_EXTENSIONS, pbEncoded + 1 + lenBytes, dataLen, dwFlags,
 822          pDecodePara, pvStructInfo, pcbStructInfo);
 823     }
 824     return ret;
 825 }
 826
 827 static BOOL WINAPI CRYPT_AsnDecodeCertInfo(DWORD dwCertEncodingType,
 828  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 829  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 830 {
 831     BOOL ret = TRUE;
 832
 833     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
 834      pDecodePara, pvStructInfo, *pcbStructInfo);
 835
 836     __TRY
 837     {
 838         struct AsnDecodeSequenceItem items[] = {
 839          { ASN_CONTEXT | ASN_CONSTRUCTOR, offsetof(CERT_INFO, dwVersion),
 840            CRYPT_AsnDecodeCertVersion, sizeof(DWORD), TRUE, FALSE, 0, 0 },
 841          { ASN_INTEGER, offsetof(CERT_INFO, SerialNumber),
 842            CRYPT_AsnDecodeIntegerInternal, sizeof(CRYPT_INTEGER_BLOB), FALSE,
 843            TRUE, offsetof(CERT_INFO, SerialNumber.pbData), 0 },
 844          { ASN_SEQUENCEOF, offsetof(CERT_INFO, SignatureAlgorithm),
 845            CRYPT_AsnDecodeAlgorithmId, sizeof(CRYPT_ALGORITHM_IDENTIFIER),
 846            FALSE, TRUE, offsetof(CERT_INFO, SignatureAlgorithm.pszObjId), 0 },
 847          { 0, offsetof(CERT_INFO, Issuer), CRYPT_AsnDecodeDerBlob,
 848            sizeof(CRYPT_DER_BLOB), FALSE, TRUE, offsetof(CERT_INFO,
 849            Issuer.pbData) },
 850          { ASN_SEQUENCEOF, offsetof(CERT_INFO, NotBefore),
 851            CRYPT_AsnDecodeValidity, sizeof(CERT_PRIVATE_KEY_VALIDITY), FALSE,
 852            FALSE, 0 },
 853          { 0, offsetof(CERT_INFO, Subject), CRYPT_AsnDecodeDerBlob,
 854            sizeof(CRYPT_DER_BLOB), FALSE, TRUE, offsetof(CERT_INFO,
 855            Subject.pbData) },
 856          { ASN_SEQUENCEOF, offsetof(CERT_INFO, SubjectPublicKeyInfo),
 857            CRYPT_AsnDecodePubKeyInfoInternal, sizeof(CERT_PUBLIC_KEY_INFO),
 858            FALSE, TRUE, offsetof(CERT_INFO,
 859            SubjectPublicKeyInfo.Algorithm.Parameters.pbData), 0 },
 860          { ASN_BITSTRING, offsetof(CERT_INFO, IssuerUniqueId),
 861            CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), TRUE, TRUE,
 862            offsetof(CERT_INFO, IssuerUniqueId.pbData), 0 },
 863          { ASN_BITSTRING, offsetof(CERT_INFO, SubjectUniqueId),
 864            CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), TRUE, TRUE,
 865            offsetof(CERT_INFO, SubjectUniqueId.pbData), 0 },
 866          { ASN_CONTEXT | ASN_CONSTRUCTOR | 3, offsetof(CERT_INFO, cExtension),
 867            CRYPT_AsnDecodeCertExtensions, sizeof(CERT_EXTENSIONS), TRUE, TRUE,
 868            offsetof(CERT_INFO, rgExtension), 0 },
 869         };
 870
 871         ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
 872          sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
 873          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
 874     }
 875     __EXCEPT_PAGE_FAULT
 876     {
 877         SetLastError(STATUS_ACCESS_VIOLATION);
 878         ret = FALSE;
 879     }
 880     __ENDTRY
 881     return ret;
 882 }
 883
 884 static BOOL WINAPI CRYPT_AsnDecodeCRLEntry(DWORD dwCertEncodingType,
 885  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 886  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 887 {
 888     BOOL ret;
 889     struct AsnDecodeSequenceItem items[] = {
 890      { ASN_INTEGER, offsetof(CRL_ENTRY, SerialNumber),
 891        CRYPT_AsnDecodeIntegerInternal, sizeof(CRYPT_INTEGER_BLOB), FALSE, TRUE,
 892        offsetof(CRL_ENTRY, SerialNumber.pbData), 0 },
 893      { 0, offsetof(CRL_ENTRY, RevocationDate), CRYPT_AsnDecodeChoiceOfTime,
 894        sizeof(FILETIME), FALSE, FALSE, 0 },
 895      { ASN_SEQUENCEOF, offsetof(CRL_ENTRY, cExtension),
 896        CRYPT_AsnDecodeExtensionsInternal, sizeof(CERT_EXTENSIONS), TRUE, TRUE,
 897        offsetof(CRL_ENTRY, rgExtension), 0 },
 898     };
 899     PCRL_ENTRY entry = (PCRL_ENTRY)pvStructInfo;
 900
 901     TRACE("%p, %ld, %08lx, %p, %ld\n", pbEncoded, cbEncoded, dwFlags, entry,
 902      *pcbStructInfo);
 903
 904     ret = CRYPT_AsnDecodeSequence(X509_ASN_ENCODING, items,
 905      sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
 906      NULL, entry, pcbStructInfo, entry ? entry->SerialNumber.pbData : NULL);
 907     return ret;
 908 }
 909
 910 /* Warning: assumes pvStructInfo is a struct GenericArray whose rgItems has
 911  * been set prior to calling.
 912  */
 913 static BOOL WINAPI CRYPT_AsnDecodeCRLEntries(DWORD dwCertEncodingType,
 914  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 915  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 916 {
 917     BOOL ret;
 918     struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
 919      CRYPT_AsnDecodeCRLEntry, sizeof(CRL_ENTRY), TRUE,
 920      offsetof(CRL_ENTRY, SerialNumber.pbData) };
 921     struct GenericArray *entries = (struct GenericArray *)pvStructInfo;
 922
 923     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
 924      pDecodePara, pvStructInfo, *pcbStructInfo);
 925
 926     ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
 927      pDecodePara, pvStructInfo, pcbStructInfo,
 928      entries ? entries->rgItems : NULL);
 929     TRACE("Returning %d (%08lx)\n", ret, GetLastError());
 930     return ret;
 931 }
 932
 933 static BOOL WINAPI CRYPT_AsnDecodeCRLInfo(DWORD dwCertEncodingType,
 934  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 935  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 936 {
 937     BOOL ret = TRUE;
 938
 939     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
 940      pDecodePara, pvStructInfo, *pcbStructInfo);
 941
 942     __TRY
 943     {
 944         struct AsnDecodeSequenceItem items[] = {
 945          { ASN_CONTEXT | ASN_CONSTRUCTOR, offsetof(CRL_INFO, dwVersion),
 946            CRYPT_AsnDecodeCertVersion, sizeof(DWORD), TRUE, FALSE, 0, 0 },
 947          { ASN_SEQUENCEOF, offsetof(CRL_INFO, SignatureAlgorithm),
 948            CRYPT_AsnDecodeAlgorithmId, sizeof(CRYPT_ALGORITHM_IDENTIFIER),
 949            FALSE, TRUE, offsetof(CRL_INFO, SignatureAlgorithm.pszObjId), 0 },
 950          { 0, offsetof(CRL_INFO, Issuer), CRYPT_AsnDecodeDerBlob,
 951            sizeof(CRYPT_DER_BLOB), FALSE, TRUE, offsetof(CRL_INFO,
 952            Issuer.pbData) },
 953          { 0, offsetof(CRL_INFO, ThisUpdate), CRYPT_AsnDecodeChoiceOfTime,
 954            sizeof(FILETIME), FALSE, FALSE, 0 },
 955          { 0, offsetof(CRL_INFO, NextUpdate), CRYPT_AsnDecodeChoiceOfTime,
 956            sizeof(FILETIME), TRUE, FALSE, 0 },
 957          { ASN_SEQUENCEOF, offsetof(CRL_INFO, cCRLEntry),
 958            CRYPT_AsnDecodeCRLEntries, sizeof(struct GenericArray), TRUE, TRUE,
 959            offsetof(CRL_INFO, rgCRLEntry), 0 },
 960          /* Note that the extensions are ignored by MS, so I'll ignore them too
 961           */
 962          { 0, offsetof(CRL_INFO, cExtension), NULL,
 963            sizeof(CERT_EXTENSIONS), TRUE, FALSE, 0 },
 964         };
 965
 966         ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
 967          sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
 968          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
 969     }
 970     __EXCEPT_PAGE_FAULT
 971     {
 972         SetLastError(STATUS_ACCESS_VIOLATION);
 973         ret = FALSE;
 974     }
 975     __ENDTRY
 976
 977     TRACE("Returning %d (%08lx)\n", ret, GetLastError());
 978     return ret;
 979 }
 980
 981 static BOOL WINAPI CRYPT_AsnDecodeOidInternal(DWORD dwCertEncodingType,
 982  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
 983  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
 984 {
 985     BOOL ret = TRUE;
 986
 987     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
 988      pDecodePara, pvStructInfo, *pcbStructInfo);
 989
 990     if (pbEncoded[0] == ASN_OBJECTIDENTIFIER)
 991     {
 992         DWORD dataLen;
 993
 994         if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
 995         {
 996             BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
 997             DWORD bytesNeeded = sizeof(LPSTR);
 998
 999             if (dataLen)
1000             {
1001                 /* The largest possible string for the first two components
1002                  * is 2.175 (= 2 * 40 + 175 = 255), so this is big enough.
1003                  */
1004                 char firstTwo[6];
1005                 const BYTE *ptr;
1006
1007                 snprintf(firstTwo, sizeof(firstTwo), "%d.%d",
1008                  pbEncoded[1 + lenBytes] / 40,
1009                  pbEncoded[1 + lenBytes] - (pbEncoded[1 + lenBytes] / 40)
1010                  * 40);
1011                 bytesNeeded += strlen(firstTwo) + 1;
1012                 for (ptr = pbEncoded + 2 + lenBytes; ret &&
1013                  ptr - pbEncoded - 1 - lenBytes < dataLen; )
1014                 {
1015                     /* large enough for ".4000000" */
1016                     char str[9];
1017                     int val = 0;
1018
1019                     while (ptr - pbEncoded - 1 - lenBytes < dataLen &&
1020                      (*ptr & 0x80))
1021                     {
1022                         val <<= 7;
1023                         val |= *ptr & 0x7f;
1024                         ptr++;
1025                     }
1026                     if (ptr - pbEncoded - 1 - lenBytes >= dataLen ||
1027                      (*ptr & 0x80))
1028                     {
1029                         SetLastError(CRYPT_E_ASN1_CORRUPT);
1030                         ret = FALSE;
1031                     }
1032                     else
1033                     {
1034                         val <<= 7;
1035                         val |= *ptr++;
1036                         snprintf(str, sizeof(str), ".%d", val);
1037                         bytesNeeded += strlen(str);
1038                     }
1039                 }
1040             }
1041             if (!pvStructInfo)
1042                 *pcbStructInfo = bytesNeeded;
1043             else if (*pcbStructInfo < bytesNeeded)
1044             {
1045                 *pcbStructInfo = bytesNeeded;
1046                 SetLastError(ERROR_MORE_DATA);
1047                 ret = FALSE;
1048             }
1049             else
1050             {
1051                 if (dataLen)
1052                 {
1053                     const BYTE *ptr;
1054                     LPSTR pszObjId = *(LPSTR *)pvStructInfo;
1055
1056                     *pszObjId = 0;
1057                     sprintf(pszObjId, "%d.%d", pbEncoded[1 + lenBytes] / 40,
1058                      pbEncoded[1 + lenBytes] - (pbEncoded[1 + lenBytes] /
1059                      40) * 40);
1060                     pszObjId += strlen(pszObjId);
1061                     for (ptr = pbEncoded + 2 + lenBytes; ret &&
1062                      ptr - pbEncoded - 1 - lenBytes < dataLen; )
1063                     {
1064                         int val = 0;
1065
1066                         while (ptr - pbEncoded - 1 - lenBytes < dataLen &&
1067                          (*ptr & 0x80))
1068                         {
1069                             val <<= 7;
1070                             val |= *ptr & 0x7f;
1071                             ptr++;
1072                         }
1073                         val <<= 7;
1074                         val |= *ptr++;
1075                         sprintf(pszObjId, ".%d", val);
1076                         pszObjId += strlen(pszObjId);
1077                     }
1078                 }
1079                 else
1080                     *(LPSTR *)pvStructInfo = NULL;
1081                 *pcbStructInfo = bytesNeeded;
1082             }
1083         }
1084     }
1085     return ret;
1086 }
1087
1088 /* Warning:  assumes pvStructInfo is a CERT_EXTENSION whose pszObjId is set
1089  * ahead of time!
1090  */
1091 static BOOL WINAPI CRYPT_AsnDecodeExtension(DWORD dwCertEncodingType,
1092  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1093  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1094 {
1095     struct AsnDecodeSequenceItem items[] = {
1096      { ASN_OBJECTIDENTIFIER, offsetof(CERT_EXTENSION, pszObjId),
1097        CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), FALSE, TRUE,
1098        offsetof(CERT_EXTENSION, pszObjId), 0 },
1099      { ASN_BOOL, offsetof(CERT_EXTENSION, fCritical), CRYPT_AsnDecodeBool,
1100        sizeof(BOOL), TRUE, FALSE, 0, 0 },
1101      { ASN_OCTETSTRING, offsetof(CERT_EXTENSION, Value),
1102        CRYPT_AsnDecodeOctetsInternal, sizeof(CRYPT_OBJID_BLOB), FALSE, TRUE,
1103        offsetof(CERT_EXTENSION, Value.pbData) },
1104     };
1105     BOOL ret = TRUE;
1106     PCERT_EXTENSION ext = (PCERT_EXTENSION)pvStructInfo;
1107
1108     TRACE("%p, %ld, %08lx, %p, %ld\n", pbEncoded, cbEncoded, dwFlags, ext,
1109      *pcbStructInfo);
1110
1111     if (ext)
1112         TRACE("ext->pszObjId is %p\n", ext->pszObjId);
1113     ret = CRYPT_AsnDecodeSequence(X509_ASN_ENCODING, items,
1114      sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags, NULL,
1115      ext, pcbStructInfo, ext ? ext->pszObjId : NULL);
1116     if (ext)
1117         TRACE("ext->pszObjId is %p (%s)\n", ext->pszObjId,
1118          debugstr_a(ext->pszObjId));
1119     TRACE("returning %d (%08lx)\n", ret, GetLastError());
1120     return ret;
1121 }
1122
1123 static BOOL WINAPI CRYPT_AsnDecodeExtensionsInternal(DWORD dwCertEncodingType,
1124  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1125  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1126 {
1127     BOOL ret = TRUE;
1128     struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
1129      CRYPT_AsnDecodeExtension, sizeof(CERT_EXTENSION), TRUE,
1130      offsetof(CERT_EXTENSION, pszObjId) };
1131     PCERT_EXTENSIONS exts = (PCERT_EXTENSIONS)pvStructInfo;
1132
1133     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1134      pDecodePara, pvStructInfo, *pcbStructInfo);
1135
1136     ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
1137      pDecodePara, pvStructInfo, pcbStructInfo, exts ? exts->rgExtension : NULL);
1138     return ret;
1139 }
1140
1141 static BOOL WINAPI CRYPT_AsnDecodeExtensions(DWORD dwCertEncodingType,
1142  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1143  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1144 {
1145     BOOL ret = TRUE;
1146
1147     __TRY
1148     {
1149         ret = CRYPT_AsnDecodeExtensionsInternal(dwCertEncodingType,
1150          lpszStructType, pbEncoded, cbEncoded,
1151          dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, pcbStructInfo);
1152         if (ret && pvStructInfo)
1153         {
1154             ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
1155              pcbStructInfo, *pcbStructInfo);
1156             if (ret)
1157             {
1158                 CERT_EXTENSIONS *exts;
1159
1160                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
1161                     pvStructInfo = *(BYTE **)pvStructInfo;
1162                 exts = (CERT_EXTENSIONS *)pvStructInfo;
1163                 exts->rgExtension = (CERT_EXTENSION *)((BYTE *)exts +
1164                  sizeof(CERT_EXTENSIONS));
1165                 ret = CRYPT_AsnDecodeExtensionsInternal(dwCertEncodingType,
1166                  lpszStructType, pbEncoded, cbEncoded,
1167                  dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
1168                  pcbStructInfo);
1169             }
1170         }
1171     }
1172     __EXCEPT_PAGE_FAULT
1173     {
1174         SetLastError(STATUS_ACCESS_VIOLATION);
1175         ret = FALSE;
1176     }
1177     __ENDTRY
1178     return ret;
1179 }
1180
1181 /* Warning: this assumes the address of value->Value.pbData is already set, in
1182  * order to avoid overwriting memory.  (In some cases, it may change it, if it
1183  * doesn't copy anything to memory.)  Be sure to set it correctly!
1184  */
1185 static BOOL WINAPI CRYPT_AsnDecodeNameValueInternal(DWORD dwCertEncodingType,
1186  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1187  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1188 {
1189     BOOL ret = TRUE;
1190     DWORD dataLen;
1191     CERT_NAME_VALUE *value = (CERT_NAME_VALUE *)pvStructInfo;
1192
1193     if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
1194     {
1195         BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
1196
1197         switch (pbEncoded[0])
1198         {
1199         case ASN_NUMERICSTRING:
1200         case ASN_PRINTABLESTRING:
1201         case ASN_IA5STRING:
1202         case ASN_T61STRING:
1203             break;
1204         default:
1205             FIXME("Unimplemented string type %02x\n", pbEncoded[0]);
1206             SetLastError(OSS_UNIMPLEMENTED);
1207             ret = FALSE;
1208         }
1209         if (ret)
1210         {
1211             DWORD bytesNeeded = sizeof(CERT_NAME_VALUE);
1212
1213             switch (pbEncoded[0])
1214             {
1215             case ASN_NUMERICSTRING:
1216             case ASN_PRINTABLESTRING:
1217             case ASN_IA5STRING:
1218             case ASN_T61STRING:
1219                 if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
1220                     bytesNeeded += dataLen;
1221                 break;
1222             }
1223             if (!value)
1224                 *pcbStructInfo = bytesNeeded;
1225             else if (*pcbStructInfo < bytesNeeded)
1226             {
1227                 *pcbStructInfo = bytesNeeded;
1228                 SetLastError(ERROR_MORE_DATA);
1229                 ret = FALSE;
1230             }
1231             else
1232             {
1233                 *pcbStructInfo = bytesNeeded;
1234                 switch (pbEncoded[0])
1235                 {
1236                 case ASN_NUMERICSTRING:
1237                     value->dwValueType = CERT_RDN_NUMERIC_STRING;
1238                     break;
1239                 case ASN_PRINTABLESTRING:
1240                     value->dwValueType = CERT_RDN_PRINTABLE_STRING;
1241                     break;
1242                 case ASN_IA5STRING:
1243                     value->dwValueType = CERT_RDN_IA5_STRING;
1244                     break;
1245                 case ASN_T61STRING:
1246                     value->dwValueType = CERT_RDN_T61_STRING;
1247                     break;
1248                 }
1249                 if (dataLen)
1250                 {
1251                     switch (pbEncoded[0])
1252                     {
1253                     case ASN_NUMERICSTRING:
1254                     case ASN_PRINTABLESTRING:
1255                     case ASN_IA5STRING:
1256                     case ASN_T61STRING:
1257                         value->Value.cbData = dataLen;
1258                         if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
1259                             value->Value.pbData = (BYTE *)pbEncoded + 1 +
1260                              lenBytes;
1261                         else
1262                         {
1263                             assert(value->Value.pbData);
1264                             memcpy(value->Value.pbData,
1265                              pbEncoded + 1 + lenBytes, dataLen);
1266                         }
1267                         break;
1268                     }
1269                 }
1270                 else
1271                 {
1272                     value->Value.cbData = 0;
1273                     value->Value.pbData = NULL;
1274                 }
1275             }
1276         }
1277     }
1278     return ret;
1279 }
1280
1281 static BOOL WINAPI CRYPT_AsnDecodeNameValue(DWORD dwCertEncodingType,
1282  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1283  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1284 {
1285     BOOL ret = TRUE;
1286
1287     __TRY
1288     {
1289         ret = CRYPT_AsnDecodeNameValueInternal(dwCertEncodingType,
1290          lpszStructType, pbEncoded, cbEncoded,
1291          dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, pcbStructInfo);
1292         if (ret && pvStructInfo)
1293         {
1294             ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
1295              pcbStructInfo, *pcbStructInfo);
1296             if (ret)
1297             {
1298                 CERT_NAME_VALUE *value;
1299
1300                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
1301                     pvStructInfo = *(BYTE **)pvStructInfo;
1302                 value = (CERT_NAME_VALUE *)pvStructInfo;
1303                 value->Value.pbData = ((BYTE *)value + sizeof(CERT_NAME_VALUE));
1304                 ret = CRYPT_AsnDecodeNameValueInternal(dwCertEncodingType,
1305                  lpszStructType, pbEncoded, cbEncoded,
1306                  dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
1307                  pcbStructInfo);
1308             }
1309         }
1310     }
1311     __EXCEPT_PAGE_FAULT
1312     {
1313         SetLastError(STATUS_ACCESS_VIOLATION);
1314         ret = FALSE;
1315     }
1316     __ENDTRY
1317     return ret;
1318 }
1319
1320 static BOOL WINAPI CRYPT_AsnDecodeRdnAttr(DWORD dwCertEncodingType,
1321  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1322  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1323 {
1324     BOOL ret;
1325     struct AsnDecodeSequenceItem items[] = {
1326      { ASN_OBJECTIDENTIFIER, offsetof(CERT_RDN_ATTR, pszObjId),
1327        CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), FALSE, TRUE,
1328        offsetof(CERT_RDN_ATTR, pszObjId), 0 },
1329      { 0, offsetof(CERT_RDN_ATTR, dwValueType),
1330        CRYPT_AsnDecodeNameValueInternal, sizeof(CERT_NAME_VALUE),
1331        FALSE, TRUE, offsetof(CERT_RDN_ATTR, Value.pbData), 0 },
1332     };
1333     CERT_RDN_ATTR *attr = (CERT_RDN_ATTR *)pvStructInfo;
1334
1335     TRACE("%p, %ld, %08lx, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1336      pvStructInfo, *pcbStructInfo);
1337
1338     if (attr)
1339         TRACE("attr->pszObjId is %p\n", attr->pszObjId);
1340     ret = CRYPT_AsnDecodeSequence(X509_ASN_ENCODING, items,
1341      sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags, NULL,
1342      attr, pcbStructInfo, attr ? attr->pszObjId : NULL);
1343     if (attr)
1344     {
1345         TRACE("attr->pszObjId is %p (%s)\n", attr->pszObjId,
1346          debugstr_a(attr->pszObjId));
1347         TRACE("attr->dwValueType is %ld\n", attr->dwValueType);
1348     }
1349     TRACE("returning %d (%08lx)\n", ret, GetLastError());
1350     return ret;
1351 }
1352
1353 static BOOL WINAPI CRYPT_AsnDecodeRdn(DWORD dwCertEncodingType,
1354  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1355  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1356 {
1357     BOOL ret = TRUE;
1358     struct AsnArrayDescriptor arrayDesc = { ASN_CONSTRUCTOR | ASN_SETOF,
1359      CRYPT_AsnDecodeRdnAttr, sizeof(CERT_RDN_ATTR), TRUE,
1360      offsetof(CERT_RDN_ATTR, pszObjId) };
1361     PCERT_RDN rdn = (PCERT_RDN)pvStructInfo;
1362
1363     ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
1364      pDecodePara, pvStructInfo, pcbStructInfo, rdn ? rdn->rgRDNAttr : NULL);
1365     return ret;
1366 }
1367
1368 static BOOL WINAPI CRYPT_AsnDecodeName(DWORD dwCertEncodingType,
1369  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1370  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1371 {
1372     BOOL ret = TRUE;
1373
1374     __TRY
1375     {
1376         struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
1377          CRYPT_AsnDecodeRdn, sizeof(CERT_RDN), TRUE,
1378          offsetof(CERT_RDN, rgRDNAttr) };
1379
1380         ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
1381          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
1382     }
1383     __EXCEPT_PAGE_FAULT
1384     {
1385         SetLastError(STATUS_ACCESS_VIOLATION);
1386         ret = FALSE;
1387     }
1388     __ENDTRY
1389     return ret;
1390 }
1391
1392 static BOOL WINAPI CRYPT_AsnDecodeCopyBytes(DWORD dwCertEncodingType,
1393  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1394  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1395 {
1396     BOOL ret = TRUE;
1397     DWORD bytesNeeded = sizeof(CRYPT_OBJID_BLOB);
1398
1399     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1400      pDecodePara, pvStructInfo, *pcbStructInfo);
1401
1402     if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
1403         bytesNeeded += cbEncoded;
1404     if (!pvStructInfo)
1405         *pcbStructInfo = bytesNeeded;
1406     else if (*pcbStructInfo < bytesNeeded)
1407     {
1408         SetLastError(ERROR_MORE_DATA);
1409         *pcbStructInfo = bytesNeeded;
1410         ret = FALSE;
1411     }
1412     else
1413     {
1414         PCRYPT_OBJID_BLOB blob = (PCRYPT_OBJID_BLOB)pvStructInfo;
1415
1416         *pcbStructInfo = bytesNeeded;
1417         blob->cbData = cbEncoded;
1418         if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
1419             blob->pbData = (LPBYTE)pbEncoded;
1420         else
1421         {
1422             assert(blob->pbData);
1423             memcpy(blob->pbData, pbEncoded, blob->cbData);
1424         }
1425     }
1426     return ret;
1427 }
1428
1429 static BOOL WINAPI CRYPT_AsnDecodeAlgorithmId(DWORD dwCertEncodingType,
1430  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1431  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1432 {
1433     CRYPT_ALGORITHM_IDENTIFIER *algo =
1434      (CRYPT_ALGORITHM_IDENTIFIER *)pvStructInfo;
1435     BOOL ret = TRUE;
1436     struct AsnDecodeSequenceItem items[] = {
1437      { ASN_OBJECTIDENTIFIER, offsetof(CRYPT_ALGORITHM_IDENTIFIER, pszObjId),
1438        CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), FALSE, TRUE,
1439        offsetof(CRYPT_ALGORITHM_IDENTIFIER, pszObjId), 0 },
1440      { 0, offsetof(CRYPT_ALGORITHM_IDENTIFIER, Parameters),
1441        CRYPT_AsnDecodeCopyBytes, sizeof(CRYPT_OBJID_BLOB), TRUE, TRUE,
1442        offsetof(CRYPT_ALGORITHM_IDENTIFIER, Parameters.pbData), 0 },
1443     };
1444
1445     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1446      pDecodePara, pvStructInfo, *pcbStructInfo);
1447
1448     ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
1449      sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
1450      pDecodePara, pvStructInfo, pcbStructInfo, algo ? algo->pszObjId : NULL);
1451     if (ret && pvStructInfo)
1452     {
1453         TRACE("pszObjId is %p (%s)\n", algo->pszObjId,
1454          debugstr_a(algo->pszObjId));
1455     }
1456     return ret;
1457 }
1458
1459 static BOOL WINAPI CRYPT_AsnDecodePubKeyInfoInternal(DWORD dwCertEncodingType,
1460  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1461  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1462 {
1463     BOOL ret = TRUE;
1464     struct AsnDecodeSequenceItem items[] = {
1465      { ASN_SEQUENCEOF, offsetof(CERT_PUBLIC_KEY_INFO, Algorithm),
1466        CRYPT_AsnDecodeAlgorithmId, sizeof(CRYPT_ALGORITHM_IDENTIFIER),
1467        FALSE, TRUE, offsetof(CERT_PUBLIC_KEY_INFO,
1468        Algorithm.pszObjId) },
1469      { ASN_BITSTRING, offsetof(CERT_PUBLIC_KEY_INFO, PublicKey),
1470        CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), FALSE, TRUE,
1471        offsetof(CERT_PUBLIC_KEY_INFO, PublicKey.pbData) },
1472     };
1473     PCERT_PUBLIC_KEY_INFO info = (PCERT_PUBLIC_KEY_INFO)pvStructInfo;
1474
1475     ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
1476      sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
1477      pDecodePara, pvStructInfo, pcbStructInfo, info ?
1478      info->Algorithm.Parameters.pbData : NULL);
1479     return ret;
1480 }
1481
1482 static BOOL WINAPI CRYPT_AsnDecodePubKeyInfo(DWORD dwCertEncodingType,
1483  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1484  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1485 {
1486     BOOL ret = TRUE;
1487
1488     __TRY
1489     {
1490         DWORD bytesNeeded;
1491
1492         if ((ret = CRYPT_AsnDecodePubKeyInfoInternal(dwCertEncodingType,
1493          lpszStructType, pbEncoded, cbEncoded,
1494          dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
1495         {
1496             if (!pvStructInfo)
1497                 *pcbStructInfo = bytesNeeded;
1498             else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
1499              pvStructInfo, pcbStructInfo, bytesNeeded)))
1500             {
1501                 PCERT_PUBLIC_KEY_INFO info;
1502
1503                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
1504                     pvStructInfo = *(BYTE **)pvStructInfo;
1505                 info = (PCERT_PUBLIC_KEY_INFO)pvStructInfo;
1506                 info->Algorithm.Parameters.pbData = (BYTE *)pvStructInfo +
1507                  sizeof(CERT_PUBLIC_KEY_INFO);
1508                 ret = CRYPT_AsnDecodePubKeyInfoInternal(dwCertEncodingType,
1509                  lpszStructType, pbEncoded, cbEncoded,
1510                  dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
1511                  &bytesNeeded);
1512             }
1513         }
1514     }
1515     __EXCEPT_PAGE_FAULT
1516     {
1517         SetLastError(STATUS_ACCESS_VIOLATION);
1518         ret = FALSE;
1519     }
1520     __ENDTRY
1521     return ret;
1522 }
1523
1524 static BOOL WINAPI CRYPT_AsnDecodeBool(DWORD dwCertEncodingType,
1525  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1526  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1527 {
1528     BOOL ret;
1529
1530     if (cbEncoded < 3)
1531     {
1532         SetLastError(CRYPT_E_ASN1_CORRUPT);
1533         return FALSE;
1534     }
1535     if (GET_LEN_BYTES(pbEncoded[1]) > 1)
1536     {
1537         SetLastError(CRYPT_E_ASN1_CORRUPT);
1538         return FALSE;
1539     }
1540     if (pbEncoded[1] > 1)
1541     {
1542         SetLastError(CRYPT_E_ASN1_CORRUPT);
1543         return FALSE;
1544     }
1545     if (!pvStructInfo)
1546     {
1547         *pcbStructInfo = sizeof(BOOL);
1548         ret = TRUE;
1549     }
1550     else if (*pcbStructInfo < sizeof(BOOL))
1551     {
1552         *pcbStructInfo = sizeof(BOOL);
1553         SetLastError(ERROR_MORE_DATA);
1554         ret = FALSE;
1555     }
1556     else
1557     {
1558         *(BOOL *)pvStructInfo = pbEncoded[2] ? TRUE : FALSE;
1559         ret = TRUE;
1560     }
1561     TRACE("returning %d (%08lx)\n", ret, GetLastError());
1562     return ret;
1563 }
1564
1565 static BOOL WINAPI CRYPT_AsnDecodeAltNameEntry(DWORD dwCertEncodingType,
1566  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1567  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1568 {
1569     PCERT_ALT_NAME_ENTRY entry = (PCERT_ALT_NAME_ENTRY)pvStructInfo;
1570     DWORD dataLen, lenBytes, bytesNeeded = sizeof(CERT_ALT_NAME_ENTRY);
1571     BOOL ret;
1572
1573     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1574      pDecodePara, pvStructInfo, *pcbStructInfo);
1575
1576     if (cbEncoded < 2)
1577     {
1578         SetLastError(CRYPT_E_ASN1_CORRUPT);
1579         return FALSE;
1580     }
1581     if ((pbEncoded[0] & ASN_FLAGS_MASK) != ASN_CONTEXT)
1582     {
1583         SetLastError(CRYPT_E_ASN1_BADTAG);
1584         return FALSE;
1585     }
1586     lenBytes = GET_LEN_BYTES(pbEncoded[1]);
1587     if (1 + lenBytes > cbEncoded)
1588     {
1589         SetLastError(CRYPT_E_ASN1_CORRUPT);
1590         return FALSE;
1591     }
1592     if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
1593     {
1594         switch (pbEncoded[0] & ASN_TYPE_MASK)
1595         {
1596         case 1: /* rfc822Name */
1597         case 2: /* dNSName */
1598         case 6: /* uniformResourceIdentifier */
1599             bytesNeeded += (dataLen + 1) * sizeof(WCHAR);
1600             break;
1601         case 7: /* iPAddress */
1602             bytesNeeded += dataLen;
1603             break;
1604         case 8: /* registeredID */
1605             /* FIXME: decode as OID */
1606         case 0: /* otherName */
1607         case 4: /* directoryName */
1608             FIXME("stub\n");
1609             SetLastError(CRYPT_E_ASN1_BADTAG);
1610             ret = FALSE;
1611             break;
1612         case 3: /* x400Address, unimplemented */
1613         case 5: /* ediPartyName, unimplemented */
1614             SetLastError(CRYPT_E_ASN1_BADTAG);
1615             ret = FALSE;
1616             break;
1617         default:
1618             SetLastError(CRYPT_E_ASN1_CORRUPT);
1619             ret = FALSE;
1620         }
1621         if (ret)
1622         {
1623             if (!entry)
1624                 *pcbStructInfo = bytesNeeded;
1625             else if (*pcbStructInfo < bytesNeeded)
1626             {
1627                 *pcbStructInfo = bytesNeeded;
1628                 SetLastError(ERROR_MORE_DATA);
1629                 ret = FALSE;
1630             }
1631             else
1632             {
1633                 *pcbStructInfo = bytesNeeded;
1634                 /* MS used values one greater than the asn1 ones.. sigh */
1635                 entry->dwAltNameChoice = (pbEncoded[0] & 0x7f) + 1;
1636                 switch (pbEncoded[0] & ASN_TYPE_MASK)
1637                 {
1638                 case 1: /* rfc822Name */
1639                 case 2: /* dNSName */
1640                 case 6: /* uniformResourceIdentifier */
1641                 {
1642                     DWORD i;
1643
1644                     for (i = 0; i < dataLen; i++)
1645                         entry->u.pwszURL[i] =
1646                          (WCHAR)pbEncoded[1 + lenBytes + i];
1647                     entry->u.pwszURL[i] = 0;
1648                     TRACE("URL is %p (%s)\n", entry->u.pwszURL,
1649                      debugstr_w(entry->u.pwszURL));
1650                     break;
1651                 }
1652                 case 7: /* iPAddress */
1653                     /* The next data pointer is in the pwszURL spot, that is,
1654                      * the first 4 bytes.  Need to move it to the next spot.
1655                      */
1656                     entry->u.IPAddress.pbData = (LPBYTE)entry->u.pwszURL;
1657                     entry->u.IPAddress.cbData = dataLen;
1658                     memcpy(entry->u.IPAddress.pbData, pbEncoded + 1 + lenBytes,
1659                      dataLen);
1660                     break;
1661                 }
1662             }
1663         }
1664     }
1665     return ret;
1666 }
1667
1668 static BOOL WINAPI CRYPT_AsnDecodeAltNameInternal(DWORD dwCertEncodingType,
1669  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1670  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1671 {
1672     BOOL ret = TRUE;
1673     struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
1674      CRYPT_AsnDecodeAltNameEntry, sizeof(CERT_ALT_NAME_ENTRY), TRUE,
1675      offsetof(CERT_ALT_NAME_ENTRY, u.pwszURL) };
1676     PCERT_ALT_NAME_INFO info = (PCERT_ALT_NAME_INFO)pvStructInfo;
1677
1678     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1679      pDecodePara, pvStructInfo, *pcbStructInfo);
1680
1681     if (info)
1682         TRACE("info->rgAltEntry is %p\n", info->rgAltEntry);
1683     ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
1684      pDecodePara, pvStructInfo, pcbStructInfo, info ? info->rgAltEntry : NULL);
1685     return ret;
1686 }
1687
1688 static BOOL WINAPI CRYPT_AsnDecodeAltName(DWORD dwCertEncodingType,
1689  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1690  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1691 {
1692     BOOL ret = TRUE;
1693
1694     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1695      pDecodePara, pvStructInfo, *pcbStructInfo);
1696
1697     __TRY
1698     {
1699         struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
1700          CRYPT_AsnDecodeAltNameEntry, sizeof(CERT_ALT_NAME_ENTRY), TRUE,
1701          offsetof(CERT_ALT_NAME_ENTRY, u.pwszURL) };
1702
1703         ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
1704          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
1705     }
1706     __EXCEPT_PAGE_FAULT
1707     {
1708         SetLastError(STATUS_ACCESS_VIOLATION);
1709         ret = FALSE;
1710     }
1711     __ENDTRY
1712     return ret;
1713 }
1714
1715 struct PATH_LEN_CONSTRAINT
1716 {
1717     BOOL  fPathLenConstraint;
1718     DWORD dwPathLenConstraint;
1719 };
1720
1721 static BOOL WINAPI CRYPT_AsnDecodePathLenConstraint(DWORD dwCertEncodingType,
1722  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1723  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1724 {
1725     BOOL ret = TRUE;
1726
1727     TRACE("%p, %ld, %08lx, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1728      pvStructInfo, *pcbStructInfo);
1729
1730     if (cbEncoded)
1731     {
1732         if (pbEncoded[0] == ASN_INTEGER)
1733         {
1734             DWORD bytesNeeded = sizeof(struct PATH_LEN_CONSTRAINT);
1735
1736             if (!pvStructInfo)
1737                 *pcbStructInfo = bytesNeeded;
1738             else if (*pcbStructInfo < bytesNeeded)
1739             {
1740                 SetLastError(ERROR_MORE_DATA);
1741                 *pcbStructInfo = bytesNeeded;
1742                 ret = FALSE;
1743             }
1744             else
1745             {
1746                 struct PATH_LEN_CONSTRAINT *constraint =
1747                  (struct PATH_LEN_CONSTRAINT *)pvStructInfo;
1748                 DWORD size = sizeof(constraint->dwPathLenConstraint);
1749
1750                 ret = CRYPT_AsnDecodeInt(dwCertEncodingType, X509_INTEGER,
1751                  pbEncoded, cbEncoded, 0, NULL,
1752                  &constraint->dwPathLenConstraint, &size);
1753                 if (ret)
1754                     constraint->fPathLenConstraint = TRUE;
1755                 TRACE("got an int, dwPathLenConstraint is %ld\n",
1756                  constraint->dwPathLenConstraint);
1757             }
1758         }
1759         else
1760         {
1761             SetLastError(CRYPT_E_ASN1_CORRUPT);
1762             ret = FALSE;
1763         }
1764     }
1765     TRACE("returning %d (%08lx)\n", ret, GetLastError());
1766     return ret;
1767 }
1768
1769 static BOOL WINAPI CRYPT_AsnDecodeSubtreeConstraints(DWORD dwCertEncodingType,
1770  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1771  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1772 {
1773     BOOL ret;
1774     struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
1775      CRYPT_AsnDecodeCopyBytes, sizeof(CERT_NAME_BLOB), TRUE,
1776      offsetof(CERT_NAME_BLOB, pbData) };
1777     struct GenericArray *entries = (struct GenericArray *)pvStructInfo;
1778
1779     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1780      pDecodePara, pvStructInfo, *pcbStructInfo);
1781
1782     ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
1783      pDecodePara, pvStructInfo, pcbStructInfo,
1784      entries ? entries->rgItems : NULL);
1785     TRACE("Returning %d (%08lx)\n", ret, GetLastError());
1786     return ret;
1787 }
1788
1789 static BOOL WINAPI CRYPT_AsnDecodeBasicConstraints(DWORD dwCertEncodingType,
1790  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1791  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1792 {
1793     BOOL ret;
1794
1795     __TRY
1796     {
1797         struct AsnDecodeSequenceItem items[] = {
1798          { ASN_BITSTRING, offsetof(CERT_BASIC_CONSTRAINTS_INFO, SubjectType),
1799            CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), FALSE, TRUE,
1800            offsetof(CERT_BASIC_CONSTRAINTS_INFO, SubjectType.pbData), 0 },
1801          { ASN_INTEGER, offsetof(CERT_BASIC_CONSTRAINTS_INFO,
1802            fPathLenConstraint), CRYPT_AsnDecodePathLenConstraint,
1803            sizeof(struct PATH_LEN_CONSTRAINT), TRUE, FALSE, 0, 0 },
1804          { ASN_SEQUENCEOF, offsetof(CERT_BASIC_CONSTRAINTS_INFO,
1805            cSubtreesConstraint), CRYPT_AsnDecodeSubtreeConstraints,
1806            sizeof(struct GenericArray), TRUE, TRUE,
1807            offsetof(CERT_BASIC_CONSTRAINTS_INFO, rgSubtreesConstraint), 0 },
1808         };
1809
1810         ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
1811          sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
1812          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
1813     }
1814     __EXCEPT_PAGE_FAULT
1815     {
1816         SetLastError(STATUS_ACCESS_VIOLATION);
1817         ret = FALSE;
1818     }
1819     __ENDTRY
1820     return ret;
1821 }
1822
1823 static BOOL WINAPI CRYPT_AsnDecodeBasicConstraints2(DWORD dwCertEncodingType,
1824  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1825  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1826 {
1827     BOOL ret;
1828
1829     __TRY
1830     {
1831         struct AsnDecodeSequenceItem items[] = {
1832          { ASN_BOOL, offsetof(CERT_BASIC_CONSTRAINTS2_INFO, fCA),
1833            CRYPT_AsnDecodeBool, sizeof(BOOL), TRUE, FALSE, 0, 0 },
1834          { ASN_INTEGER, offsetof(CERT_BASIC_CONSTRAINTS2_INFO,
1835            fPathLenConstraint), CRYPT_AsnDecodePathLenConstraint,
1836            sizeof(struct PATH_LEN_CONSTRAINT), TRUE, FALSE, 0, 0 },
1837         };
1838
1839         ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
1840          sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
1841          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
1842     }
1843     __EXCEPT_PAGE_FAULT
1844     {
1845         SetLastError(STATUS_ACCESS_VIOLATION);
1846         ret = FALSE;
1847     }
1848     __ENDTRY
1849     return ret;
1850 }
1851
1852 #define RSA1_MAGIC 0x31415352
1853
1854 struct DECODED_RSA_PUB_KEY
1855 {
1856     DWORD              pubexp;
1857     CRYPT_INTEGER_BLOB modulus;
1858 };
1859
1860 static BOOL WINAPI CRYPT_AsnDecodeRsaPubKey(DWORD dwCertEncodingType,
1861  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1862  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1863 {
1864     BOOL ret;
1865
1866     __TRY
1867     {
1868         struct AsnDecodeSequenceItem items[] = {
1869          { ASN_INTEGER, offsetof(struct DECODED_RSA_PUB_KEY, modulus),
1870            CRYPT_AsnDecodeUnsignedIntegerInternal, sizeof(CRYPT_INTEGER_BLOB),
1871            FALSE, TRUE, offsetof(struct DECODED_RSA_PUB_KEY, modulus.pbData),
1872            0 },
1873          { ASN_INTEGER, offsetof(struct DECODED_RSA_PUB_KEY, pubexp),
1874            CRYPT_AsnDecodeInt, sizeof(DWORD), FALSE, FALSE, 0, 0 },
1875         };
1876         struct DECODED_RSA_PUB_KEY *decodedKey = NULL;
1877         DWORD size = 0;
1878
1879         ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
1880          sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded,
1881          CRYPT_DECODE_ALLOC_FLAG, NULL, &decodedKey, &size, NULL);
1882         if (ret)
1883         {
1884             DWORD bytesNeeded = sizeof(BLOBHEADER) + sizeof(RSAPUBKEY) +
1885              decodedKey->modulus.cbData;
1886
1887             if (!pvStructInfo)
1888             {
1889                 *pcbStructInfo = bytesNeeded;
1890                 ret = TRUE;
1891             }
1892             else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
1893              pvStructInfo, pcbStructInfo, bytesNeeded)))
1894             {
1895                 BLOBHEADER *hdr;
1896                 RSAPUBKEY *rsaPubKey;
1897
1898                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
1899                     pvStructInfo = *(BYTE **)pvStructInfo;
1900                 hdr = (BLOBHEADER *)pvStructInfo;
1901                 hdr->bType = PUBLICKEYBLOB;
1902                 hdr->bVersion = CUR_BLOB_VERSION;
1903                 hdr->reserved = 0;
1904                 hdr->aiKeyAlg = CALG_RSA_KEYX;
1905                 rsaPubKey = (RSAPUBKEY *)((BYTE *)pvStructInfo +
1906                  sizeof(BLOBHEADER));
1907                 rsaPubKey->magic = RSA1_MAGIC;
1908                 rsaPubKey->pubexp = decodedKey->pubexp;
1909                 rsaPubKey->bitlen = decodedKey->modulus.cbData * 8;
1910                 memcpy((BYTE *)pvStructInfo + sizeof(BLOBHEADER) +
1911                  sizeof(RSAPUBKEY), decodedKey->modulus.pbData,
1912                  decodedKey->modulus.cbData);
1913             }
1914             LocalFree(decodedKey);
1915         }
1916     }
1917     __EXCEPT_PAGE_FAULT
1918     {
1919         SetLastError(STATUS_ACCESS_VIOLATION);
1920         ret = FALSE;
1921     }
1922     __ENDTRY
1923     return ret;
1924 }
1925
1926 static BOOL WINAPI CRYPT_AsnDecodeOctetsInternal(DWORD dwCertEncodingType,
1927  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1928  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1929 {
1930     BOOL ret;
1931     DWORD bytesNeeded, dataLen;
1932
1933     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1934      pDecodePara, pvStructInfo, *pcbStructInfo);
1935
1936     if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
1937     {
1938         if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
1939             bytesNeeded = sizeof(CRYPT_DATA_BLOB);
1940         else
1941             bytesNeeded = dataLen + sizeof(CRYPT_DATA_BLOB);
1942         if (!pvStructInfo)
1943             *pcbStructInfo = bytesNeeded;
1944         else if (*pcbStructInfo < bytesNeeded)
1945         {
1946             SetLastError(ERROR_MORE_DATA);
1947             *pcbStructInfo = bytesNeeded;
1948             ret = FALSE;
1949         }
1950         else
1951         {
1952             CRYPT_DATA_BLOB *blob;
1953             BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
1954
1955             blob = (CRYPT_DATA_BLOB *)pvStructInfo;
1956             blob->cbData = dataLen;
1957             if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
1958                 blob->pbData = (BYTE *)pbEncoded + 1 + lenBytes;
1959             else
1960             {
1961                 assert(blob->pbData);
1962                 if (blob->cbData)
1963                     memcpy(blob->pbData, pbEncoded + 1 + lenBytes,
1964                      blob->cbData);
1965             }
1966         }
1967     }
1968     return ret;
1969 }
1970
1971 static BOOL WINAPI CRYPT_AsnDecodeOctets(DWORD dwCertEncodingType,
1972  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
1973  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
1974 {
1975     BOOL ret;
1976
1977     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
1978      pDecodePara, pvStructInfo, *pcbStructInfo);
1979
1980     __TRY
1981     {
1982         DWORD bytesNeeded;
1983
1984         if (!cbEncoded)
1985         {
1986             SetLastError(CRYPT_E_ASN1_CORRUPT);
1987             ret = FALSE;
1988         }
1989         else if (pbEncoded[0] != ASN_OCTETSTRING)
1990         {
1991             SetLastError(CRYPT_E_ASN1_BADTAG);
1992             ret = FALSE;
1993         }
1994         else if ((ret = CRYPT_AsnDecodeOctetsInternal(dwCertEncodingType,
1995          lpszStructType, pbEncoded, cbEncoded,
1996          dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
1997         {
1998             if (!pvStructInfo)
1999                 *pcbStructInfo = bytesNeeded;
2000             else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
2001              pvStructInfo, pcbStructInfo, bytesNeeded)))
2002             {
2003                 CRYPT_DATA_BLOB *blob;
2004
2005                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2006                     pvStructInfo = *(BYTE **)pvStructInfo;
2007                 blob = (CRYPT_DATA_BLOB *)pvStructInfo;
2008                 blob->pbData = (BYTE *)pvStructInfo + sizeof(CRYPT_DATA_BLOB);
2009                 ret = CRYPT_AsnDecodeOctetsInternal(dwCertEncodingType,
2010                  lpszStructType, pbEncoded, cbEncoded,
2011                  dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
2012                  &bytesNeeded);
2013             }
2014         }
2015     }
2016     __EXCEPT_PAGE_FAULT
2017     {
2018         SetLastError(STATUS_ACCESS_VIOLATION);
2019         ret = FALSE;
2020     }
2021     __ENDTRY
2022     return ret;
2023 }
2024
2025 static BOOL WINAPI CRYPT_AsnDecodeBitsInternal(DWORD dwCertEncodingType,
2026  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2027  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2028 {
2029     BOOL ret;
2030
2031     TRACE("(%p, %ld, 0x%08lx, %p, %p, %ld)\n", pbEncoded, cbEncoded, dwFlags,
2032      pDecodePara, pvStructInfo, *pcbStructInfo);
2033
2034     if (pbEncoded[0] == ASN_BITSTRING)
2035     {
2036         DWORD bytesNeeded, dataLen;
2037
2038         if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
2039         {
2040             if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
2041                 bytesNeeded = sizeof(CRYPT_BIT_BLOB);
2042             else
2043                 bytesNeeded = dataLen - 1 + sizeof(CRYPT_BIT_BLOB);
2044             if (!pvStructInfo)
2045                 *pcbStructInfo = bytesNeeded;
2046             else if (*pcbStructInfo < bytesNeeded)
2047             {
2048                 *pcbStructInfo = bytesNeeded;
2049                 SetLastError(ERROR_MORE_DATA);
2050                 ret = FALSE;
2051             }
2052             else
2053             {
2054                 CRYPT_BIT_BLOB *blob;
2055
2056                 blob = (CRYPT_BIT_BLOB *)pvStructInfo;
2057                 blob->cbData = dataLen - 1;
2058                 blob->cUnusedBits = *(pbEncoded + 1 +
2059                  GET_LEN_BYTES(pbEncoded[1]));
2060                 if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
2061                 {
2062                     blob->pbData = (BYTE *)pbEncoded + 2 +
2063                      GET_LEN_BYTES(pbEncoded[1]);
2064                 }
2065                 else
2066                 {
2067                     assert(blob->pbData);
2068                     if (blob->cbData)
2069                     {
2070                         BYTE mask = 0xff << blob->cUnusedBits;
2071
2072                         memcpy(blob->pbData, pbEncoded + 2 +
2073                          GET_LEN_BYTES(pbEncoded[1]), blob->cbData);
2074                         blob->pbData[blob->cbData - 1] &= mask;
2075                     }
2076                 }
2077             }
2078         }
2079     }
2080     else
2081     {
2082         SetLastError(CRYPT_E_ASN1_BADTAG);
2083         ret = FALSE;
2084     }
2085     TRACE("returning %d (%08lx)\n", ret, GetLastError());
2086     return ret;
2087 }
2088
2089 static BOOL WINAPI CRYPT_AsnDecodeBits(DWORD dwCertEncodingType,
2090  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2091  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2092 {
2093     BOOL ret;
2094
2095     TRACE("(%p, %ld, 0x%08lx, %p, %p, %p)\n", pbEncoded, cbEncoded, dwFlags,
2096      pDecodePara, pvStructInfo, pcbStructInfo);
2097
2098     __TRY
2099     {
2100         DWORD bytesNeeded;
2101
2102         if ((ret = CRYPT_AsnDecodeBitsInternal(dwCertEncodingType,
2103          lpszStructType, pbEncoded, cbEncoded,
2104          dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
2105         {
2106             if (!pvStructInfo)
2107                 *pcbStructInfo = bytesNeeded;
2108             else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
2109              pvStructInfo, pcbStructInfo, bytesNeeded)))
2110             {
2111                 CRYPT_BIT_BLOB *blob;
2112
2113                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2114                     pvStructInfo = *(BYTE **)pvStructInfo;
2115                 blob = (CRYPT_BIT_BLOB *)pvStructInfo;
2116                 blob->pbData = (BYTE *)pvStructInfo + sizeof(CRYPT_BIT_BLOB);
2117                 ret = CRYPT_AsnDecodeBitsInternal(dwCertEncodingType,
2118                  lpszStructType, pbEncoded, cbEncoded,
2119                  dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
2120                  &bytesNeeded);
2121             }
2122         }
2123     }
2124     __EXCEPT_PAGE_FAULT
2125     {
2126         SetLastError(STATUS_ACCESS_VIOLATION);
2127         ret = FALSE;
2128     }
2129     __ENDTRY
2130     TRACE("returning %d (%08lx)\n", ret, GetLastError());
2131     return ret;
2132 }
2133
2134 static BOOL WINAPI CRYPT_AsnDecodeInt(DWORD dwCertEncodingType,
2135  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2136  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2137 {
2138     BOOL ret;
2139
2140     if (!pvStructInfo)
2141     {
2142         *pcbStructInfo = sizeof(int);
2143         return TRUE;
2144     }
2145     __TRY
2146     {
2147         BYTE buf[sizeof(CRYPT_INTEGER_BLOB) + sizeof(int)];
2148         CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)buf;
2149         DWORD size = sizeof(buf);
2150
2151         blob->pbData = buf + sizeof(CRYPT_INTEGER_BLOB);
2152         ret = CRYPT_AsnDecodeIntegerInternal(dwCertEncodingType,
2153          X509_MULTI_BYTE_INTEGER, pbEncoded, cbEncoded, 0, NULL, &buf, &size);
2154         if (ret)
2155         {
2156             if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
2157              pvStructInfo, pcbStructInfo, sizeof(int))))
2158             {
2159                 int val, i;
2160
2161                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2162                     pvStructInfo = *(BYTE **)pvStructInfo;
2163                 if (blob->pbData[blob->cbData - 1] & 0x80)
2164                 {
2165                     /* initialize to a negative value to sign-extend */
2166                     val = -1;
2167                 }
2168                 else
2169                     val = 0;
2170                 for (i = 0; i < blob->cbData; i++)
2171                 {
2172                     val <<= 8;
2173                     val |= blob->pbData[blob->cbData - i - 1];
2174                 }
2175                 memcpy(pvStructInfo, &val, sizeof(int));
2176             }
2177         }
2178         else if (GetLastError() == ERROR_MORE_DATA)
2179             SetLastError(CRYPT_E_ASN1_LARGE);
2180     }
2181     __EXCEPT_PAGE_FAULT
2182     {
2183         SetLastError(STATUS_ACCESS_VIOLATION);
2184         ret = FALSE;
2185     }
2186     __ENDTRY
2187     return ret;
2188 }
2189
2190 static BOOL WINAPI CRYPT_AsnDecodeIntegerInternal(DWORD dwCertEncodingType,
2191  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2192  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2193 {
2194     BOOL ret;
2195
2196     if (pbEncoded[0] == ASN_INTEGER)
2197     {
2198         DWORD bytesNeeded, dataLen;
2199
2200         if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
2201         {
2202             BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
2203
2204             bytesNeeded = dataLen + sizeof(CRYPT_INTEGER_BLOB);
2205             if (!pvStructInfo)
2206                 *pcbStructInfo = bytesNeeded;
2207             else if (*pcbStructInfo < bytesNeeded)
2208             {
2209                 *pcbStructInfo = bytesNeeded;
2210                 SetLastError(ERROR_MORE_DATA);
2211                 ret = FALSE;
2212             }
2213             else
2214             {
2215                 CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
2216
2217                 blob->cbData = dataLen;
2218                 assert(blob->pbData);
2219                 if (blob->cbData)
2220                 {
2221                     DWORD i;
2222
2223                     for (i = 0; i < blob->cbData; i++)
2224                     {
2225                         blob->pbData[i] = *(pbEncoded + 1 + lenBytes +
2226                          dataLen - i - 1);
2227                     }
2228                 }
2229             }
2230         }
2231     }
2232     else
2233     {
2234         SetLastError(CRYPT_E_ASN1_BADTAG);
2235         ret = FALSE;
2236     }
2237     return ret;
2238 }
2239
2240 static BOOL WINAPI CRYPT_AsnDecodeInteger(DWORD dwCertEncodingType,
2241  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2242  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2243 {
2244     BOOL ret;
2245
2246     __TRY
2247     {
2248         DWORD bytesNeeded;
2249
2250         if ((ret = CRYPT_AsnDecodeIntegerInternal(dwCertEncodingType,
2251          lpszStructType, pbEncoded, cbEncoded,
2252          dwFlags & ~CRYPT_ENCODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
2253         {
2254             if (!pvStructInfo)
2255                 *pcbStructInfo = bytesNeeded;
2256             else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
2257              pvStructInfo, pcbStructInfo, bytesNeeded)))
2258             {
2259                 CRYPT_INTEGER_BLOB *blob;
2260
2261                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2262                     pvStructInfo = *(BYTE **)pvStructInfo;
2263                 blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
2264                 blob->pbData = (BYTE *)pvStructInfo +
2265                  sizeof(CRYPT_INTEGER_BLOB);
2266                 ret = CRYPT_AsnDecodeIntegerInternal(dwCertEncodingType,
2267                  lpszStructType, pbEncoded, cbEncoded,
2268                  dwFlags & ~CRYPT_ENCODE_ALLOC_FLAG, NULL, pvStructInfo,
2269                  &bytesNeeded);
2270             }
2271         }
2272     }
2273     __EXCEPT_PAGE_FAULT
2274     {
2275         SetLastError(STATUS_ACCESS_VIOLATION);
2276         ret = FALSE;
2277     }
2278     __ENDTRY
2279     return ret;
2280 }
2281
2282 static BOOL WINAPI CRYPT_AsnDecodeUnsignedIntegerInternal(
2283  DWORD dwCertEncodingType, LPCSTR lpszStructType, const BYTE *pbEncoded,
2284  DWORD cbEncoded, DWORD dwFlags, PCRYPT_DECODE_PARA pDecodePara,
2285  void *pvStructInfo, DWORD *pcbStructInfo)
2286 {
2287     BOOL ret;
2288
2289     if (pbEncoded[0] == ASN_INTEGER)
2290     {
2291         DWORD bytesNeeded, dataLen;
2292
2293         if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
2294         {
2295             BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
2296
2297             bytesNeeded = dataLen + sizeof(CRYPT_INTEGER_BLOB);
2298             if (!pvStructInfo)
2299                 *pcbStructInfo = bytesNeeded;
2300             else if (*pcbStructInfo < bytesNeeded)
2301             {
2302                 *pcbStructInfo = bytesNeeded;
2303                 SetLastError(ERROR_MORE_DATA);
2304                 ret = FALSE;
2305             }
2306             else
2307             {
2308                 CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
2309
2310                 blob->cbData = dataLen;
2311                 assert(blob->pbData);
2312                 /* remove leading zero byte if it exists */
2313                 if (blob->cbData && *(pbEncoded + 1 + lenBytes) == 0)
2314                 {
2315                     blob->cbData--;
2316                     blob->pbData++;
2317                 }
2318                 if (blob->cbData)
2319                 {
2320                     DWORD i;
2321
2322                     for (i = 0; i < blob->cbData; i++)
2323                     {
2324                         blob->pbData[i] = *(pbEncoded + 1 + lenBytes +
2325                          dataLen - i - 1);
2326                     }
2327                 }
2328             }
2329         }
2330     }
2331     else
2332     {
2333         SetLastError(CRYPT_E_ASN1_BADTAG);
2334         ret = FALSE;
2335     }
2336     return ret;
2337 }
2338
2339 static BOOL WINAPI CRYPT_AsnDecodeUnsignedInteger(DWORD dwCertEncodingType,
2340  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2341  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2342 {
2343     BOOL ret;
2344
2345     __TRY
2346     {
2347         DWORD bytesNeeded;
2348
2349         if ((ret = CRYPT_AsnDecodeUnsignedIntegerInternal(dwCertEncodingType,
2350          lpszStructType, pbEncoded, cbEncoded,
2351          dwFlags & ~CRYPT_ENCODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
2352         {
2353             if (!pvStructInfo)
2354                 *pcbStructInfo = bytesNeeded;
2355             else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
2356              pvStructInfo, pcbStructInfo, bytesNeeded)))
2357             {
2358                 CRYPT_INTEGER_BLOB *blob;
2359
2360                 if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2361                     pvStructInfo = *(BYTE **)pvStructInfo;
2362                 blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
2363                 blob->pbData = (BYTE *)pvStructInfo +
2364                  sizeof(CRYPT_INTEGER_BLOB);
2365                 ret = CRYPT_AsnDecodeUnsignedIntegerInternal(dwCertEncodingType,
2366                  lpszStructType, pbEncoded, cbEncoded,
2367                  dwFlags & ~CRYPT_ENCODE_ALLOC_FLAG, NULL, pvStructInfo,
2368                  &bytesNeeded);
2369             }
2370         }
2371     }
2372     __EXCEPT_PAGE_FAULT
2373     {
2374         SetLastError(STATUS_ACCESS_VIOLATION);
2375         ret = FALSE;
2376     }
2377     __ENDTRY
2378     return ret;
2379 }
2380
2381 static BOOL WINAPI CRYPT_AsnDecodeEnumerated(DWORD dwCertEncodingType,
2382  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2383  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2384 {
2385     BOOL ret;
2386
2387     if (!pvStructInfo)
2388     {
2389         *pcbStructInfo = sizeof(int);
2390         return TRUE;
2391     }
2392     __TRY
2393     {
2394         if (pbEncoded[0] == ASN_ENUMERATED)
2395         {
2396             unsigned int val = 0, i;
2397
2398             if (cbEncoded <= 1)
2399             {
2400                 SetLastError(CRYPT_E_ASN1_EOD);
2401                 ret = FALSE;
2402             }
2403             else if (pbEncoded[1] == 0)
2404             {
2405                 SetLastError(CRYPT_E_ASN1_CORRUPT);
2406                 ret = FALSE;
2407             }
2408             else
2409             {
2410                 /* A little strange looking, but we have to accept a sign byte:
2411                  * 0xffffffff gets encoded as 0a 05 00 ff ff ff ff.  Also,
2412                  * assuming a small length is okay here, it has to be in short
2413                  * form.
2414                  */
2415                 if (pbEncoded[1] > sizeof(unsigned int) + 1)
2416                 {
2417                     SetLastError(CRYPT_E_ASN1_LARGE);
2418                     return FALSE;
2419                 }
2420                 for (i = 0; i < pbEncoded[1]; i++)
2421                 {
2422                     val <<= 8;
2423                     val |= pbEncoded[2 + i];
2424                 }
2425                 if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
2426                  pvStructInfo, pcbStructInfo, sizeof(unsigned int))))
2427                 {
2428                     if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2429                         pvStructInfo = *(BYTE **)pvStructInfo;
2430                     memcpy(pvStructInfo, &val, sizeof(unsigned int));
2431                 }
2432             }
2433         }
2434         else
2435         {
2436             SetLastError(CRYPT_E_ASN1_BADTAG);
2437             ret = FALSE;
2438         }
2439     }
2440     __EXCEPT_PAGE_FAULT
2441     {
2442         SetLastError(STATUS_ACCESS_VIOLATION);
2443         ret = FALSE;
2444     }
2445     __ENDTRY
2446     return ret;
2447 }
2448
2449 /* Modifies word, pbEncoded, and len, and magically sets a value ret to FALSE
2450  * if it fails.
2451  */
2452 #define CRYPT_TIME_GET_DIGITS(pbEncoded, len, numDigits, word) \
2453  do { \
2454     BYTE i; \
2455  \
2456     (word) = 0; \
2457     for (i = 0; (len) > 0 && i < (numDigits); i++, (len)--) \
2458     { \
2459         if (!isdigit(*(pbEncoded))) \
2460         { \
2461             SetLastError(CRYPT_E_ASN1_CORRUPT); \
2462             ret = FALSE; \
2463         } \
2464         else \
2465         { \
2466             (word) *= 10; \
2467             (word) += *(pbEncoded)++ - '0'; \
2468         } \
2469     } \
2470  } while (0)
2471
2472 static BOOL CRYPT_AsnDecodeTimeZone(const BYTE *pbEncoded, DWORD len,
2473  SYSTEMTIME *sysTime)
2474 {
2475     BOOL ret;
2476
2477     __TRY
2478     {
2479         ret = TRUE;
2480         if (len >= 3 && (*pbEncoded == '+' || *pbEncoded == '-'))
2481         {
2482             WORD hours, minutes = 0;
2483             BYTE sign = *pbEncoded++;
2484
2485             len--;
2486             CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, hours);
2487             if (ret && hours >= 24)
2488             {
2489                 SetLastError(CRYPT_E_ASN1_CORRUPT);
2490                 ret = FALSE;
2491             }
2492             else if (len >= 2)
2493             {
2494                 CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, minutes);
2495                 if (ret && minutes >= 60)
2496                 {
2497                     SetLastError(CRYPT_E_ASN1_CORRUPT);
2498                     ret = FALSE;
2499                 }
2500             }
2501             if (ret)
2502             {
2503                 if (sign == '+')
2504                 {
2505                     sysTime->wHour += hours;
2506                     sysTime->wMinute += minutes;
2507                 }
2508                 else
2509                 {
2510                     if (hours > sysTime->wHour)
2511                     {
2512                         sysTime->wDay--;
2513                         sysTime->wHour = 24 - (hours - sysTime->wHour);
2514                     }
2515                     else
2516                         sysTime->wHour -= hours;
2517                     if (minutes > sysTime->wMinute)
2518                     {
2519                         sysTime->wHour--;
2520                         sysTime->wMinute = 60 - (minutes - sysTime->wMinute);
2521                     }
2522                     else
2523                         sysTime->wMinute -= minutes;
2524                 }
2525             }
2526         }
2527     }
2528     __EXCEPT_PAGE_FAULT
2529     {
2530         SetLastError(STATUS_ACCESS_VIOLATION);
2531         ret = FALSE;
2532     }
2533     __ENDTRY
2534     return ret;
2535 }
2536
2537 #define MIN_ENCODED_TIME_LENGTH 10
2538
2539 static BOOL WINAPI CRYPT_AsnDecodeUtcTime(DWORD dwCertEncodingType,
2540  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2541  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2542 {
2543     BOOL ret;
2544
2545     if (!pvStructInfo)
2546     {
2547         *pcbStructInfo = sizeof(FILETIME);
2548         return TRUE;
2549     }
2550     __TRY
2551     {
2552         ret = TRUE;
2553         if (pbEncoded[0] == ASN_UTCTIME)
2554         {
2555             if (cbEncoded <= 1)
2556             {
2557                 SetLastError(CRYPT_E_ASN1_EOD);
2558                 ret = FALSE;
2559             }
2560             else if (pbEncoded[1] > 0x7f)
2561             {
2562                 /* long-form date strings really can't be valid */
2563                 SetLastError(CRYPT_E_ASN1_CORRUPT);
2564                 ret = FALSE;
2565             }
2566             else
2567             {
2568                 SYSTEMTIME sysTime = { 0 };
2569                 BYTE len = pbEncoded[1];
2570
2571                 if (len < MIN_ENCODED_TIME_LENGTH)
2572                 {
2573                     SetLastError(CRYPT_E_ASN1_CORRUPT);
2574                     ret = FALSE;
2575                 }
2576                 else
2577                 {
2578                     pbEncoded += 2;
2579                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wYear);
2580                     if (sysTime.wYear >= 50)
2581                         sysTime.wYear += 1900;
2582                     else
2583                         sysTime.wYear += 2000;
2584                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wMonth);
2585                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wDay);
2586                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wHour);
2587                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wMinute);
2588                     if (ret && len > 0)
2589                     {
2590                         if (len >= 2 && isdigit(*pbEncoded) &&
2591                          isdigit(*(pbEncoded + 1)))
2592                             CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2,
2593                              sysTime.wSecond);
2594                         else if (isdigit(*pbEncoded))
2595                             CRYPT_TIME_GET_DIGITS(pbEncoded, len, 1,
2596                              sysTime.wSecond);
2597                         if (ret)
2598                             ret = CRYPT_AsnDecodeTimeZone(pbEncoded, len,
2599                              &sysTime);
2600                     }
2601                     if (ret && (ret = CRYPT_DecodeEnsureSpace(dwFlags,
2602                      pDecodePara, pvStructInfo, pcbStructInfo,
2603                      sizeof(FILETIME))))
2604                     {
2605                         if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2606                             pvStructInfo = *(BYTE **)pvStructInfo;
2607                         ret = SystemTimeToFileTime(&sysTime,
2608                          (FILETIME *)pvStructInfo);
2609                     }
2610                 }
2611             }
2612         }
2613         else
2614         {
2615             SetLastError(CRYPT_E_ASN1_BADTAG);
2616             ret = FALSE;
2617         }
2618     }
2619     __EXCEPT_PAGE_FAULT
2620     {
2621         SetLastError(STATUS_ACCESS_VIOLATION);
2622         ret = FALSE;
2623     }
2624     __ENDTRY
2625     return ret;
2626 }
2627
2628 static BOOL WINAPI CRYPT_AsnDecodeGeneralizedTime(DWORD dwCertEncodingType,
2629  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2630  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2631 {
2632     BOOL ret;
2633
2634     if (!pvStructInfo)
2635     {
2636         *pcbStructInfo = sizeof(FILETIME);
2637         return TRUE;
2638     }
2639     __TRY
2640     {
2641         ret = TRUE;
2642         if (pbEncoded[0] == ASN_GENERALTIME)
2643         {
2644             if (cbEncoded <= 1)
2645             {
2646                 SetLastError(CRYPT_E_ASN1_EOD);
2647                 ret = FALSE;
2648             }
2649             else if (pbEncoded[1] > 0x7f)
2650             {
2651                 /* long-form date strings really can't be valid */
2652                 SetLastError(CRYPT_E_ASN1_CORRUPT);
2653                 ret = FALSE;
2654             }
2655             else
2656             {
2657                 BYTE len = pbEncoded[1];
2658
2659                 if (len < MIN_ENCODED_TIME_LENGTH)
2660                 {
2661                     SetLastError(CRYPT_E_ASN1_CORRUPT);
2662                     ret = FALSE;
2663                 }
2664                 else
2665                 {
2666                     SYSTEMTIME sysTime = { 0 };
2667
2668                     pbEncoded += 2;
2669                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 4, sysTime.wYear);
2670                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wMonth);
2671                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wDay);
2672                     CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wHour);
2673                     if (ret && len > 0)
2674                     {
2675                         CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2,
2676                          sysTime.wMinute);
2677                         if (ret && len > 0)
2678                             CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2,
2679                              sysTime.wSecond);
2680                         if (ret && len > 0 && (*pbEncoded == '.' ||
2681                          *pbEncoded == ','))
2682                         {
2683                             BYTE digits;
2684
2685                             pbEncoded++;
2686                             len--;
2687                             /* workaround macro weirdness */
2688                             digits = min(len, 3);
2689                             CRYPT_TIME_GET_DIGITS(pbEncoded, len, digits,
2690                              sysTime.wMilliseconds);
2691                         }
2692                         if (ret)
2693                             ret = CRYPT_AsnDecodeTimeZone(pbEncoded, len,
2694                              &sysTime);
2695                     }
2696                     if (ret && (ret = CRYPT_DecodeEnsureSpace(dwFlags,
2697                      pDecodePara, pvStructInfo, pcbStructInfo,
2698                      sizeof(FILETIME))))
2699                     {
2700                         if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2701                             pvStructInfo = *(BYTE **)pvStructInfo;
2702                         ret = SystemTimeToFileTime(&sysTime,
2703                          (FILETIME *)pvStructInfo);
2704                     }
2705                 }
2706             }
2707         }
2708         else
2709         {
2710             SetLastError(CRYPT_E_ASN1_BADTAG);
2711             ret = FALSE;
2712         }
2713     }
2714     __EXCEPT_PAGE_FAULT
2715     {
2716         SetLastError(STATUS_ACCESS_VIOLATION);
2717         ret = FALSE;
2718     }
2719     __ENDTRY
2720     return ret;
2721 }
2722
2723 static BOOL WINAPI CRYPT_AsnDecodeChoiceOfTime(DWORD dwCertEncodingType,
2724  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2725  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2726 {
2727     BOOL ret;
2728
2729     __TRY
2730     {
2731         if (pbEncoded[0] == ASN_UTCTIME)
2732             ret = CRYPT_AsnDecodeUtcTime(dwCertEncodingType, lpszStructType,
2733              pbEncoded, cbEncoded, dwFlags, pDecodePara, pvStructInfo,
2734              pcbStructInfo);
2735         else if (pbEncoded[0] == ASN_GENERALTIME)
2736             ret = CRYPT_AsnDecodeGeneralizedTime(dwCertEncodingType,
2737              lpszStructType, pbEncoded, cbEncoded, dwFlags, pDecodePara,
2738              pvStructInfo, pcbStructInfo);
2739         else
2740         {
2741             SetLastError(CRYPT_E_ASN1_BADTAG);
2742             ret = FALSE;
2743         }
2744     }
2745     __EXCEPT_PAGE_FAULT
2746     {
2747         SetLastError(STATUS_ACCESS_VIOLATION);
2748         ret = FALSE;
2749     }
2750     __ENDTRY
2751     return ret;
2752 }
2753
2754 static BOOL WINAPI CRYPT_AsnDecodeSequenceOfAny(DWORD dwCertEncodingType,
2755  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2756  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2757 {
2758     BOOL ret = TRUE;
2759
2760     __TRY
2761     {
2762         if (pbEncoded[0] == ASN_SEQUENCEOF)
2763         {
2764             DWORD bytesNeeded, dataLen, remainingLen, cValue;
2765
2766             if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
2767             {
2768                 BYTE lenBytes;
2769                 const BYTE *ptr;
2770
2771                 lenBytes = GET_LEN_BYTES(pbEncoded[1]);
2772                 bytesNeeded = sizeof(CRYPT_SEQUENCE_OF_ANY);
2773                 cValue = 0;
2774                 ptr = pbEncoded + 1 + lenBytes;
2775                 remainingLen = dataLen;
2776                 while (ret && remainingLen)
2777                 {
2778                     DWORD nextLen;
2779
2780                     ret = CRYPT_GetLen(ptr, remainingLen, &nextLen);
2781                     if (ret)
2782                     {
2783                         DWORD nextLenBytes = GET_LEN_BYTES(ptr[1]);
2784
2785                         remainingLen -= 1 + nextLenBytes + nextLen;
2786                         ptr += 1 + nextLenBytes + nextLen;
2787                         bytesNeeded += sizeof(CRYPT_DER_BLOB);
2788                         if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
2789                             bytesNeeded += 1 + nextLenBytes + nextLen;
2790                         cValue++;
2791                     }
2792                 }
2793                 if (ret)
2794                 {
2795                     CRYPT_SEQUENCE_OF_ANY *seq;
2796                     BYTE *nextPtr;
2797                     DWORD i;
2798
2799                     if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
2800                      pvStructInfo, pcbStructInfo, bytesNeeded)))
2801                     {
2802                         if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
2803                             pvStructInfo = *(BYTE **)pvStructInfo;
2804                         seq = (CRYPT_SEQUENCE_OF_ANY *)pvStructInfo;
2805                         seq->cValue = cValue;
2806                         seq->rgValue = (CRYPT_DER_BLOB *)((BYTE *)seq +
2807                          sizeof(*seq));
2808                         nextPtr = (BYTE *)seq->rgValue +
2809                          cValue * sizeof(CRYPT_DER_BLOB);
2810                         ptr = pbEncoded + 1 + lenBytes;
2811                         remainingLen = dataLen;
2812                         i = 0;
2813                         while (ret && remainingLen)
2814                         {
2815                             DWORD nextLen;
2816
2817                             ret = CRYPT_GetLen(ptr, remainingLen, &nextLen);
2818                             if (ret)
2819                             {
2820                                 DWORD nextLenBytes = GET_LEN_BYTES(ptr[1]);
2821
2822                                 seq->rgValue[i].cbData = 1 + nextLenBytes +
2823                                  nextLen;
2824                                 if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
2825                                     seq->rgValue[i].pbData = (BYTE *)ptr;
2826                                 else
2827                                 {
2828                                     seq->rgValue[i].pbData = nextPtr;
2829                                     memcpy(nextPtr, ptr, 1 + nextLenBytes +
2830                                      nextLen);
2831                                     nextPtr += 1 + nextLenBytes + nextLen;
2832                                 }
2833                                 remainingLen -= 1 + nextLenBytes + nextLen;
2834                                 ptr += 1 + nextLenBytes + nextLen;
2835                                 i++;
2836                             }
2837                         }
2838                     }
2839                 }
2840             }
2841         }
2842         else
2843         {
2844             SetLastError(CRYPT_E_ASN1_BADTAG);
2845             return FALSE;
2846         }
2847     }
2848     __EXCEPT_PAGE_FAULT
2849     {
2850         SetLastError(STATUS_ACCESS_VIOLATION);
2851         ret = FALSE;
2852     }
2853     __ENDTRY
2854     return ret;
2855 }
2856
2857 static BOOL WINAPI CRYPT_AsnDecodeDistPoint(DWORD dwCertEncodingType,
2858  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2859  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2860 {
2861     struct AsnDecodeSequenceItem items[] = {
2862      { ASN_CONTEXT | ASN_CONSTRUCTOR | 0, offsetof(CRL_DIST_POINT,
2863        DistPointName), CRYPT_AsnDecodeAltNameInternal,
2864        sizeof(CRL_DIST_POINT_NAME), TRUE, TRUE, offsetof(CRL_DIST_POINT,
2865        DistPointName.u.FullName.rgAltEntry), 0 },
2866      { ASN_CONTEXT | 1, offsetof(CRL_DIST_POINT, ReasonFlags),
2867        CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), TRUE, TRUE,
2868        offsetof(CRL_DIST_POINT, ReasonFlags.pbData), 0 },
2869      { ASN_CONTEXT | ASN_CONSTRUCTOR | 2, offsetof(CRL_DIST_POINT, CRLIssuer),
2870        CRYPT_AsnDecodeAltNameInternal, sizeof(CERT_ALT_NAME_INFO), TRUE, TRUE,
2871        offsetof(CRL_DIST_POINT, CRLIssuer.rgAltEntry), 0 },
2872     };
2873     BOOL ret;
2874
2875     ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
2876      sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded,
2877      dwFlags, pDecodePara, pvStructInfo, pcbStructInfo, NULL);
2878     return ret;
2879 }
2880
2881 static BOOL WINAPI CRYPT_AsnDecodeCRLDistPoints(DWORD dwCertEncodingType,
2882  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2883  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2884 {
2885     BOOL ret;
2886
2887     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
2888      pDecodePara, pvStructInfo, *pcbStructInfo);
2889
2890     __TRY
2891     {
2892         struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
2893          CRYPT_AsnDecodeDistPoint, sizeof(CRL_DIST_POINT), TRUE,
2894          offsetof(CRL_DIST_POINT, DistPointName.u.FullName.rgAltEntry) };
2895
2896         ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
2897          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
2898     }
2899     __EXCEPT_PAGE_FAULT
2900     {
2901         SetLastError(STATUS_ACCESS_VIOLATION);
2902         ret = FALSE;
2903     }
2904     __ENDTRY
2905     return ret;
2906 }
2907
2908 static BOOL WINAPI CRYPT_AsnDecodeEnhancedKeyUsage(DWORD dwCertEncodingType,
2909  LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2910  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2911 {
2912     BOOL ret;
2913
2914     TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
2915      pDecodePara, pvStructInfo, *pcbStructInfo);
2916
2917     __TRY
2918     {
2919         struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
2920          CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), TRUE, 0 };
2921
2922         ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
2923          pDecodePara, pvStructInfo, pcbStructInfo, NULL);
2924     }
2925     __EXCEPT_PAGE_FAULT
2926     {
2927         SetLastError(STATUS_ACCESS_VIOLATION);
2928         ret = FALSE;
2929     }
2930     __ENDTRY
2931     return ret;
2932 }
2933
2934 BOOL WINAPI CryptDecodeObjectEx(DWORD dwCertEncodingType, LPCSTR lpszStructType,
2935  const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
2936  PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
2937 {
2938     static HCRYPTOIDFUNCSET set = NULL;
2939     BOOL ret = FALSE;
2940     CryptDecodeObjectExFunc decodeFunc = NULL;
2941     HCRYPTOIDFUNCADDR hFunc = NULL;
2942
2943     TRACE("(0x%08lx, %s, %p, %ld, 0x%08lx, %p, %p, %p)\n",
2944      dwCertEncodingType, debugstr_a(lpszStructType), pbEncoded,
2945      cbEncoded, dwFlags, pDecodePara, pvStructInfo, pcbStructInfo);
2946
2947     if (!pvStructInfo && !pcbStructInfo)
2948     {
2949         SetLastError(ERROR_INVALID_PARAMETER);
2950         return FALSE;
2951     }
2952     if ((dwCertEncodingType & CERT_ENCODING_TYPE_MASK) != X509_ASN_ENCODING
2953      && (dwCertEncodingType & CMSG_ENCODING_TYPE_MASK) != PKCS_7_ASN_ENCODING)
2954     {
2955         SetLastError(ERROR_FILE_NOT_FOUND);
2956         return FALSE;
2957     }
2958     if (!cbEncoded)
2959     {
2960         SetLastError(CRYPT_E_ASN1_EOD);
2961         return FALSE;
2962     }
2963     if (cbEncoded > MAX_ENCODED_LEN)
2964     {
2965         SetLastError(CRYPT_E_ASN1_LARGE);
2966         return FALSE;
2967     }
2968
2969     SetLastError(NOERROR);
2970     if (dwFlags & CRYPT_DECODE_ALLOC_FLAG && pvStructInfo)
2971         *(BYTE **)pvStructInfo = NULL;
2972     if (!HIWORD(lpszStructType))
2973     {
2974         switch (LOWORD(lpszStructType))
2975         {
2976         case (WORD)X509_CERT:
2977             decodeFunc = CRYPT_AsnDecodeCert;
2978             break;
2979         case (WORD)X509_CERT_TO_BE_SIGNED:
2980             decodeFunc = CRYPT_AsnDecodeCertInfo;
2981             break;
2982         case (WORD)X509_CERT_CRL_TO_BE_SIGNED:
2983             decodeFunc = CRYPT_AsnDecodeCRLInfo;
2984             break;
2985         case (WORD)X509_EXTENSIONS:
2986             decodeFunc = CRYPT_AsnDecodeExtensions;
2987             break;
2988         case (WORD)X509_NAME_VALUE:
2989             decodeFunc = CRYPT_AsnDecodeNameValue;
2990             break;
2991         case (WORD)X509_NAME:
2992             decodeFunc = CRYPT_AsnDecodeName;
2993             break;
2994         case (WORD)X509_PUBLIC_KEY_INFO:
2995             decodeFunc = CRYPT_AsnDecodePubKeyInfo;
2996             break;
2997         case (WORD)X509_ALTERNATE_NAME:
2998             decodeFunc = CRYPT_AsnDecodeAltName;
2999             break;
3000         case (WORD)X509_BASIC_CONSTRAINTS:
3001             decodeFunc = CRYPT_AsnDecodeBasicConstraints;
3002             break;
3003         case (WORD)X509_BASIC_CONSTRAINTS2:
3004             decodeFunc = CRYPT_AsnDecodeBasicConstraints2;
3005             break;
3006         case (WORD)RSA_CSP_PUBLICKEYBLOB:
3007             decodeFunc = CRYPT_AsnDecodeRsaPubKey;
3008             break;
3009         case (WORD)X509_OCTET_STRING:
3010             decodeFunc = CRYPT_AsnDecodeOctets;
3011             break;
3012         case (WORD)X509_BITS:
3013         case (WORD)X509_KEY_USAGE:
3014             decodeFunc = CRYPT_AsnDecodeBits;
3015             break;
3016         case (WORD)X509_INTEGER:
3017             decodeFunc = CRYPT_AsnDecodeInt;
3018             break;
3019         case (WORD)X509_MULTI_BYTE_INTEGER:
3020             decodeFunc = CRYPT_AsnDecodeInteger;
3021             break;
3022         case (WORD)X509_MULTI_BYTE_UINT:
3023             decodeFunc = CRYPT_AsnDecodeUnsignedInteger;
3024             break;
3025         case (WORD)X509_ENUMERATED:
3026             decodeFunc = CRYPT_AsnDecodeEnumerated;
3027             break;
3028         case (WORD)X509_CHOICE_OF_TIME:
3029             decodeFunc = CRYPT_AsnDecodeChoiceOfTime;
3030             break;
3031         case (WORD)X509_SEQUENCE_OF_ANY:
3032             decodeFunc = CRYPT_AsnDecodeSequenceOfAny;
3033             break;
3034         case (WORD)PKCS_UTC_TIME:
3035             decodeFunc = CRYPT_AsnDecodeUtcTime;
3036             break;
3037         case (WORD)X509_CRL_DIST_POINTS:
3038             decodeFunc = CRYPT_AsnDecodeCRLDistPoints;
3039             break;
3040         case (WORD)X509_ENHANCED_KEY_USAGE:
3041             decodeFunc = CRYPT_AsnDecodeEnhancedKeyUsage;
3042             break;
3043         default:
3044             FIXME("%d: unimplemented\n", LOWORD(lpszStructType));
3045         }
3046     }
3047     else if (!strcmp(lpszStructType, szOID_CERT_EXTENSIONS))
3048         decodeFunc = CRYPT_AsnDecodeExtensions;
3049     else if (!strcmp(lpszStructType, szOID_RSA_signingTime))
3050         decodeFunc = CRYPT_AsnDecodeUtcTime;
3051     else if (!strcmp(lpszStructType, szOID_CRL_REASON_CODE))
3052         decodeFunc = CRYPT_AsnDecodeEnumerated;
3053     else if (!strcmp(lpszStructType, szOID_KEY_USAGE))
3054         decodeFunc = CRYPT_AsnDecodeBits;
3055     else if (!strcmp(lpszStructType, szOID_SUBJECT_KEY_IDENTIFIER))
3056         decodeFunc = CRYPT_AsnDecodeOctets;
3057     else if (!strcmp(lpszStructType, szOID_BASIC_CONSTRAINTS))
3058         decodeFunc = CRYPT_AsnDecodeBasicConstraints;
3059     else if (!strcmp(lpszStructType, szOID_BASIC_CONSTRAINTS2))
3060         decodeFunc = CRYPT_AsnDecodeBasicConstraints2;
3061     else if (!strcmp(lpszStructType, szOID_ISSUER_ALT_NAME))
3062         decodeFunc = CRYPT_AsnDecodeAltName;
3063     else if (!strcmp(lpszStructType, szOID_ISSUER_ALT_NAME2))
3064         decodeFunc = CRYPT_AsnDecodeAltName;
3065     else if (!strcmp(lpszStructType, szOID_NEXT_UPDATE_LOCATION))
3066         decodeFunc = CRYPT_AsnDecodeAltName;
3067     else if (!strcmp(lpszStructType, szOID_SUBJECT_ALT_NAME))
3068         decodeFunc = CRYPT_AsnDecodeAltName;
3069     else if (!strcmp(lpszStructType, szOID_SUBJECT_ALT_NAME2))
3070         decodeFunc = CRYPT_AsnDecodeAltName;
3071     else if (!strcmp(lpszStructType, szOID_CRL_DIST_POINTS))
3072         decodeFunc = CRYPT_AsnDecodeCRLDistPoints;
3073     else if (!strcmp(lpszStructType, szOID_ENHANCED_KEY_USAGE))
3074         decodeFunc = CRYPT_AsnDecodeEnhancedKeyUsage;
3075     else
3076         TRACE("OID %s not found or unimplemented, looking for DLL\n",
3077          debugstr_a(lpszStructType));
3078     if (!decodeFunc)
3079     {
3080         if (!set)
3081             set = CryptInitOIDFunctionSet(CRYPT_OID_DECODE_OBJECT_EX_FUNC, 0);
3082         CryptGetOIDFunctionAddress(set, dwCertEncodingType, lpszStructType, 0,
3083          (void **)&decodeFunc, &hFunc);
3084     }
3085     if (decodeFunc)
3086         ret = decodeFunc(dwCertEncodingType, lpszStructType, pbEncoded,
3087          cbEncoded, dwFlags, pDecodePara, pvStructInfo, pcbStructInfo);
3088     else
3089         SetLastError(ERROR_FILE_NOT_FOUND);
3090     if (hFunc)
3091         CryptFreeOIDFunctionAddress(hFunc, 0);
3092     return ret;
3093 }