crypto/dso/dso_win32.c

   1 /* dso_win32.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <string.h>
  61 #include "cryptlib.h"
  62 #include <openssl/dso.h>
  63
  64 #if !defined(DSO_WIN32)
  65 DSO_METHOD *DSO_METHOD_win32(void)
  66         {
  67         return NULL;
  68         }
  69 #else
  70
  71 #ifdef _WIN32_WCE
  72 # if _WIN32_WCE < 300
  73 static FARPROC GetProcAddressA(HMODULE hModule,LPCSTR lpProcName)
  74         {
  75         WCHAR lpProcNameW[64];
  76         int i;
  77
  78         for (i=0;lpProcName[i] && i<64;i++)
  79                 lpProcNameW[i] = (WCHAR)lpProcName[i];
  80         if (i==64) return NULL;
  81         lpProcNameW[i] = 0;
  82
  83         return GetProcAddressW(hModule,lpProcNameW);
  84         }
  85 # endif
  86 # undef GetProcAddress
  87 # define GetProcAddress GetProcAddressA
  88
  89 static HINSTANCE LoadLibraryA(LPCSTR lpLibFileName)
  90         {
  91         WCHAR *fnamw;
  92         size_t len_0=strlen(lpLibFileName)+1,i;
  93
  94 #ifdef _MSC_VER
  95         fnamw = (WCHAR *)_alloca (len_0*sizeof(WCHAR));
  96 #else
  97         fnamw = (WCHAR *)alloca (len_0*sizeof(WCHAR));
  98 #endif
  99         if (fnamw == NULL) return NULL;
 100
 101 #if defined(_WIN32_WCE) && _WIN32_WCE>=101
 102         if (!MultiByteToWideChar(CP_ACP,0,lpLibFileName,len_0,fnamw,len_0))
 103 #endif
 104                 for (i=0;i<len_0;i++) fnamw[i]=(WCHAR)lpLibFileName[i];
 105
 106         return LoadLibraryW(fnamw);
 107         }
 108 #endif
 109
 110 /* Part of the hack in "win32_load" ... */
 111 #define DSO_MAX_TRANSLATED_SIZE 256
 112
 113 static int win32_load(DSO *dso);
 114 static int win32_unload(DSO *dso);
 115 static void *win32_bind_var(DSO *dso, const char *symname);
 116 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
 117 #if 0
 118 static int win32_unbind_var(DSO *dso, char *symname, void *symptr);
 119 static int win32_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
 120 static int win32_init(DSO *dso);
 121 static int win32_finish(DSO *dso);
 122 static long win32_ctrl(DSO *dso, int cmd, long larg, void *parg);
 123 #endif
 124 static char *win32_name_converter(DSO *dso, const char *filename);
 125 static char *win32_merger(DSO *dso, const char *filespec1,
 126         const char *filespec2);
 127
 128 static const char *openssl_strnchr(const char *string, int c, size_t len);
 129
 130 static DSO_METHOD dso_meth_win32 = {
 131         "OpenSSL 'win32' shared library method",
 132         win32_load,
 133         win32_unload,
 134         win32_bind_var,
 135         win32_bind_func,
 136 /* For now, "unbind" doesn't exist */
 137 #if 0
 138         NULL, /* unbind_var */
 139         NULL, /* unbind_func */
 140 #endif
 141         NULL, /* ctrl */
 142         win32_name_converter,
 143         win32_merger,
 144         NULL, /* init */
 145         NULL  /* finish */
 146         };
 147
 148 DSO_METHOD *DSO_METHOD_win32(void)
 149         {
 150         return(&dso_meth_win32);
 151         }
 152
 153 /* For this DSO_METHOD, our meth_data STACK will contain;
 154  * (i) a pointer to the handle (HINSTANCE) returned from
 155  *     LoadLibrary(), and copied.
 156  */
 157
 158 static int win32_load(DSO *dso)
 159         {
 160         HINSTANCE h = NULL, *p = NULL;
 161         /* See applicable comments from dso_dl.c */
 162         char *filename = DSO_convert_filename(dso, NULL);
 163
 164         if(filename == NULL)
 165                 {
 166                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_NO_FILENAME);
 167                 goto err;
 168                 }
 169         h = LoadLibraryA(filename);
 170         if(h == NULL)
 171                 {
 172                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_LOAD_FAILED);
 173                 ERR_add_error_data(3, "filename(", filename, ")");
 174                 goto err;
 175                 }
 176         p = (HINSTANCE *)OPENSSL_malloc(sizeof(HINSTANCE));
 177         if(p == NULL)
 178                 {
 179                 DSOerr(DSO_F_WIN32_LOAD,ERR_R_MALLOC_FAILURE);
 180                 goto err;
 181                 }
 182         *p = h;
 183         if(!sk_push(dso->meth_data, (char *)p))
 184                 {
 185                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_STACK_ERROR);
 186                 goto err;
 187                 }
 188         /* Success */
 189         dso->loaded_filename = filename;
 190         return(1);
 191 err:
 192         /* Cleanup !*/
 193         if(filename != NULL)
 194                 OPENSSL_free(filename);
 195         if(p != NULL)
 196                 OPENSSL_free(p);
 197         if(h != NULL)
 198                 FreeLibrary(h);
 199         return(0);
 200         }
 201
 202 static int win32_unload(DSO *dso)
 203         {
 204         HINSTANCE *p;
 205         if(dso == NULL)
 206                 {
 207                 DSOerr(DSO_F_WIN32_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
 208                 return(0);
 209                 }
 210         if(sk_num(dso->meth_data) < 1)
 211                 return(1);
 212         p = (HINSTANCE *)sk_pop(dso->meth_data);
 213         if(p == NULL)
 214                 {
 215                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_NULL_HANDLE);
 216                 return(0);
 217                 }
 218         if(!FreeLibrary(*p))
 219                 {
 220                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_UNLOAD_FAILED);
 221                 /* We should push the value back onto the stack in
 222                  * case of a retry. */
 223                 sk_push(dso->meth_data, (char *)p);
 224                 return(0);
 225                 }
 226         /* Cleanup */
 227         OPENSSL_free(p);
 228         return(1);
 229         }
 230
 231 /* Using GetProcAddress for variables? TODO: Check this out in
 232  * the Win32 API docs, there's probably a variant for variables. */
 233 static void *win32_bind_var(DSO *dso, const char *symname)
 234         {
 235         HINSTANCE *ptr;
 236         void *sym;
 237
 238         if((dso == NULL) || (symname == NULL))
 239                 {
 240                 DSOerr(DSO_F_WIN32_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 241                 return(NULL);
 242                 }
 243         if(sk_num(dso->meth_data) < 1)
 244                 {
 245                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_STACK_ERROR);
 246                 return(NULL);
 247                 }
 248         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 249         if(ptr == NULL)
 250                 {
 251                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_NULL_HANDLE);
 252                 return(NULL);
 253                 }
 254         sym = GetProcAddress(*ptr, symname);
 255         if(sym == NULL)
 256                 {
 257                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_SYM_FAILURE);
 258                 ERR_add_error_data(3, "symname(", symname, ")");
 259                 return(NULL);
 260                 }
 261         return(sym);
 262         }
 263
 264 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 265         {
 266         HINSTANCE *ptr;
 267         void *sym;
 268
 269         if((dso == NULL) || (symname == NULL))
 270                 {
 271                 DSOerr(DSO_F_WIN32_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 272                 return(NULL);
 273                 }
 274         if(sk_num(dso->meth_data) < 1)
 275                 {
 276                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_STACK_ERROR);
 277                 return(NULL);
 278                 }
 279         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 280         if(ptr == NULL)
 281                 {
 282                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_NULL_HANDLE);
 283                 return(NULL);
 284                 }
 285         sym = GetProcAddress(*ptr, symname);
 286         if(sym == NULL)
 287                 {
 288                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_SYM_FAILURE);
 289                 ERR_add_error_data(3, "symname(", symname, ")");
 290                 return(NULL);
 291                 }
 292         return((DSO_FUNC_TYPE)sym);
 293         }
 294
 295 struct file_st
 296         {
 297         const char *node; int nodelen;
 298         const char *device; int devicelen;
 299         const char *predir; int predirlen;
 300         const char *dir; int dirlen;
 301         const char *file; int filelen;
 302         };
 303
 304 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 305         int assume_last_is_dir)
 306         {
 307         struct file_st *result = NULL;
 308         enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 309         const char *start = filename;
 310         char last;
 311
 312         if (!filename)
 313                 {
 314                 DSOerr(DSO_F_WIN32_SPLITTER,DSO_R_NO_FILENAME);
 315                 /*goto err;*/
 316                 return(NULL);
 317                 }
 318
 319         result = OPENSSL_malloc(sizeof(struct file_st));
 320         if(result == NULL)
 321                 {
 322                 DSOerr(DSO_F_WIN32_SPLITTER,
 323                         ERR_R_MALLOC_FAILURE);
 324                 return(NULL);
 325                 }
 326
 327         memset(result, 0, sizeof(struct file_st));
 328         position = IN_DEVICE;
 329
 330         if(filename[0] == '\\' && filename[1] == '\\'
 331                 || filename[0] == '/' && filename[1] == '/')
 332                 {
 333                 position = IN_NODE;
 334                 filename += 2;
 335                 start = filename;
 336                 result->node = start;
 337                 }
 338
 339         do
 340                 {
 341                 last = filename[0];
 342                 switch(last)
 343                         {
 344                 case ':':
 345                         if(position != IN_DEVICE)
 346                                 {
 347                                 DSOerr(DSO_F_WIN32_SPLITTER,
 348                                         DSO_R_INCORRECT_FILE_SYNTAX);
 349                                 /*goto err;*/
 350                                 return(NULL);
 351                                 }
 352                         result->device = start;
 353                         result->devicelen = filename - start;
 354                         position = IN_FILE;
 355                         start = ++filename;
 356                         result->dir = start;
 357                         break;
 358                 case '\\':
 359                 case '/':
 360                         if(position == IN_NODE)
 361                                 {
 362                                 result->nodelen = filename - start;
 363                                 position = IN_FILE;
 364                                 start = ++filename;
 365                                 result->dir = start;
 366                                 }
 367                         else if(position == IN_DEVICE)
 368                                 {
 369                                 position = IN_FILE;
 370                                 filename++;
 371                                 result->dir = start;
 372                                 result->dirlen = filename - start;
 373                                 start = filename;
 374                                 }
 375                         else
 376                                 {
 377                                 filename++;
 378                                 result->dirlen += filename - start;
 379                                 start = filename;
 380                                 }
 381                         break;
 382                 case '\0':
 383                         if(position == IN_NODE)
 384                                 {
 385                                 result->nodelen = filename - start;
 386                                 }
 387                         else
 388                                 {
 389                                 if(filename - start > 0)
 390                                         {
 391                                         if (assume_last_is_dir)
 392                                                 {
 393                                                 if (position == IN_DEVICE)
 394                                                         {
 395                                                         result->dir = start;
 396                                                         result->dirlen = 0;
 397                                                         }
 398                                                 result->dirlen +=
 399                                                         filename - start;
 400                                                 }
 401                                         else
 402                                                 {
 403                                                 result->file = start;
 404                                                 result->filelen =
 405                                                         filename - start;
 406                                                 }
 407                                         }
 408                                 }
 409                         break;
 410                 default:
 411                         filename++;
 412                         break;
 413                         }
 414                 }
 415         while(last);
 416
 417         if(!result->nodelen) result->node = NULL;
 418         if(!result->devicelen) result->device = NULL;
 419         if(!result->dirlen) result->dir = NULL;
 420         if(!result->filelen) result->file = NULL;
 421
 422         return(result);
 423         }
 424
 425 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 426         {
 427         int len = 0, offset = 0;
 428         char *result = NULL;
 429         const char *start;
 430
 431         if(!file_split)
 432                 {
 433                 DSOerr(DSO_F_WIN32_JOINER,
 434                                 ERR_R_PASSED_NULL_PARAMETER);
 435                 return(NULL);
 436                 }
 437         if(file_split->node)
 438                 {
 439                 len += 2 + file_split->nodelen; /* 2 for starting \\ */
 440                 if(file_split->predir || file_split->dir || file_split->file)
 441                         len++;  /* 1 for ending \ */
 442                 }
 443         else if(file_split->device)
 444                 {
 445                 len += file_split->devicelen + 1; /* 1 for ending : */
 446                 }
 447         len += file_split->predirlen;
 448         if(file_split->predir && (file_split->dir || file_split->file))
 449                 {
 450                 len++;  /* 1 for ending \ */
 451                 }
 452         len += file_split->dirlen;
 453         if(file_split->dir && file_split->file)
 454                 {
 455                 len++;  /* 1 for ending \ */
 456                 }
 457         len += file_split->filelen;
 458
 459         if(!len)
 460                 {
 461                 DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 462                 return(NULL);
 463                 }
 464
 465         result = OPENSSL_malloc(len + 1);
 466         if (!result)
 467                 {
 468                 DSOerr(DSO_F_WIN32_JOINER,
 469                         ERR_R_MALLOC_FAILURE);
 470                 return(NULL);
 471                 }
 472
 473         if(file_split->node)
 474                 {
 475                 strcpy(&result[offset], "\\\\"); offset += 2;
 476                 strncpy(&result[offset], file_split->node,
 477                         file_split->nodelen); offset += file_split->nodelen;
 478                 if(file_split->predir || file_split->dir || file_split->file)
 479                         {
 480                         result[offset] = '\\'; offset++;
 481                         }
 482                 }
 483         else if(file_split->device)
 484                 {
 485                 strncpy(&result[offset], file_split->device,
 486                         file_split->devicelen); offset += file_split->devicelen;
 487                 result[offset] = ':'; offset++;
 488                 }
 489         start = file_split->predir;
 490         while(file_split->predirlen > (start - file_split->predir))
 491                 {
 492                 const char *end = openssl_strnchr(start, '/',
 493                         file_split->predirlen - (start - file_split->predir));
 494                 if(!end)
 495                         end = start
 496                                 + file_split->predirlen
 497                                 - (start - file_split->predir);
 498                 strncpy(&result[offset], start,
 499                         end - start); offset += end - start;
 500                 result[offset] = '\\'; offset++;
 501                 start = end + 1;
 502                 }
 503 #if 0 /* Not needed, since the directory converter above already appeneded
 504          a backslash */
 505         if(file_split->predir && (file_split->dir || file_split->file))
 506                 {
 507                 result[offset] = '\\'; offset++;
 508                 }
 509 #endif
 510         start = file_split->dir;
 511         while(file_split->dirlen > (start - file_split->dir))
 512                 {
 513                 const char *end = openssl_strnchr(start, '/',
 514                         file_split->dirlen - (start - file_split->dir));
 515                 if(!end)
 516                         end = start
 517                                 + file_split->dirlen
 518                                 - (start - file_split->dir);
 519                 strncpy(&result[offset], start,
 520                         end - start); offset += end - start;
 521                 result[offset] = '\\'; offset++;
 522                 start = end + 1;
 523                 }
 524 #if 0 /* Not needed, since the directory converter above already appeneded
 525          a backslash */
 526         if(file_split->dir && file_split->file)
 527                 {
 528                 result[offset] = '\\'; offset++;
 529                 }
 530 #endif
 531         strncpy(&result[offset], file_split->file,
 532                 file_split->filelen); offset += file_split->filelen;
 533         result[offset] = '\0';
 534         return(result);
 535         }
 536
 537 static char *win32_merger(DSO *dso, const char *filespec1, const char *filespec2)
 538         {
 539         char *merged = NULL;
 540         struct file_st *filespec1_split = NULL;
 541         struct file_st *filespec2_split = NULL;
 542
 543         if(!filespec1 && !filespec2)
 544                 {
 545                 DSOerr(DSO_F_WIN32_MERGER,
 546                                 ERR_R_PASSED_NULL_PARAMETER);
 547                 return(NULL);
 548                 }
 549         if (!filespec2)
 550                 {
 551                 merged = OPENSSL_malloc(strlen(filespec1) + 1);
 552                 if(!merged)
 553                         {
 554                         DSOerr(DSO_F_WIN32_MERGER,
 555                                 ERR_R_MALLOC_FAILURE);
 556                         return(NULL);
 557                         }
 558                 strcpy(merged, filespec1);
 559                 }
 560         else if (!filespec1)
 561                 {
 562                 merged = OPENSSL_malloc(strlen(filespec2) + 1);
 563                 if(!merged)
 564                         {
 565                         DSOerr(DSO_F_WIN32_MERGER,
 566                                 ERR_R_MALLOC_FAILURE);
 567                         return(NULL);
 568                         }
 569                 strcpy(merged, filespec2);
 570                 }
 571         else
 572                 {
 573                 filespec1_split = win32_splitter(dso, filespec1, 0);
 574                 if (!filespec1_split)
 575                         {
 576                         DSOerr(DSO_F_WIN32_MERGER,
 577                                 ERR_R_MALLOC_FAILURE);
 578                         return(NULL);
 579                         }
 580                 filespec2_split = win32_splitter(dso, filespec2, 1);
 581                 if (!filespec2_split)
 582                         {
 583                         DSOerr(DSO_F_WIN32_MERGER,
 584                                 ERR_R_MALLOC_FAILURE);
 585                         OPENSSL_free(filespec1_split);
 586                         return(NULL);
 587                         }
 588
 589                 /* Fill in into filespec1_split */
 590                 if (!filespec1_split->node && !filespec1_split->device)
 591                         {
 592                         filespec1_split->node = filespec2_split->node;
 593                         filespec1_split->nodelen = filespec2_split->nodelen;
 594                         filespec1_split->device = filespec2_split->device;
 595                         filespec1_split->devicelen = filespec2_split->devicelen;
 596                         }
 597                 if (!filespec1_split->dir)
 598                         {
 599                         filespec1_split->dir = filespec2_split->dir;
 600                         filespec1_split->dirlen = filespec2_split->dirlen;
 601                         }
 602                 else if (filespec1_split->dir[0] != '\\'
 603                         && filespec1_split->dir[0] != '/')
 604                         {
 605                         filespec1_split->predir = filespec2_split->dir;
 606                         filespec1_split->predirlen = filespec2_split->dirlen;
 607                         }
 608                 if (!filespec1_split->file)
 609                         {
 610                         filespec1_split->file = filespec2_split->file;
 611                         filespec1_split->filelen = filespec2_split->filelen;
 612                         }
 613
 614                 merged = win32_joiner(dso, filespec1_split);
 615                 }
 616         return(merged);
 617         }
 618
 619 static char *win32_name_converter(DSO *dso, const char *filename)
 620         {
 621         char *translated;
 622         int len, transform;
 623
 624         len = strlen(filename);
 625         transform = ((strstr(filename, "/") == NULL) &&
 626                         (strstr(filename, "\\") == NULL) &&
 627                         (strstr(filename, ":") == NULL));
 628         if(transform)
 629                 /* We will convert this to "%s.dll" */
 630                 translated = OPENSSL_malloc(len + 5);
 631         else
 632                 /* We will simply duplicate filename */
 633                 translated = OPENSSL_malloc(len + 1);
 634         if(translated == NULL)
 635                 {
 636                 DSOerr(DSO_F_WIN32_NAME_CONVERTER,
 637                                 DSO_R_NAME_TRANSLATION_FAILED);
 638                 return(NULL);
 639                 }
 640         if(transform)
 641                 sprintf(translated, "%s.dll", filename);
 642         else
 643                 sprintf(translated, "%s", filename);
 644         return(translated);
 645         }
 646
 647 static const char *openssl_strnchr(const char *string, int c, size_t len)
 648         {
 649         size_t i;
 650         const char *p;
 651         for (i = 0, p = string; i < len && *p; i++, p++)
 652                 {
 653                 if (*p == c)
 654                         return p;
 655                 }
 656         return NULL;
 657         }
 658
 659
 660 #endif /* OPENSSL_SYS_WIN32 */