crypto/rand/rand_win.c

   1 /* crypto/rand/rand_win.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112
 113
 114 #include "cryptlib.h"
 115 #include <openssl/rand.h>
 116 #include "rand_lcl.h"
 117
 118 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
 119 #include <windows.h>
 120 #ifndef _WIN32_WINNT
 121 # define _WIN32_WINNT 0x0400
 122 #endif
 123 #include <wincrypt.h>
 124 #include <tlhelp32.h>
 125
 126 /* Limit the time spent walking through the heap, processes, threads and modules to
 127    a maximum of 1000 miliseconds each, unless CryptoGenRandom failed */
 128 #define MAXDELAY 1000
 129
 130 /* Intel hardware RNG CSP -- available from
 131  * http://developer.intel.com/design/security/rng/redist_license.htm
 132  */
 133 #define PROV_INTEL_SEC 22
 134 #define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
 135
 136 static void readtimer(void);
 137 static void readscreen(void);
 138
 139 /* It appears like CURSORINFO, PCURSORINFO and LPCURSORINFO are only defined
 140    when WINVER is 0x0500 and up, which currently only happens on Win2000.
 141    Unfortunately, those are typedefs, so they're a little bit difficult to
 142    detect properly.  On the other hand, the macro CURSOR_SHOWING is defined
 143    within the same conditional, so it can be use to detect the absence of said
 144    typedefs. */
 145
 146 #ifndef CURSOR_SHOWING
 147 /*
 148  * Information about the global cursor.
 149  */
 150 typedef struct tagCURSORINFO
 151 {
 152     DWORD   cbSize;
 153     DWORD   flags;
 154     HCURSOR hCursor;
 155     POINT   ptScreenPos;
 156 } CURSORINFO, *PCURSORINFO, *LPCURSORINFO;
 157
 158 #define CURSOR_SHOWING     0x00000001
 159 #endif /* CURSOR_SHOWING */
 160
 161 #if !defined(OPENSSL_SYS_WINCE)
 162 typedef BOOL (WINAPI *CRYPTACQUIRECONTEXTW)(HCRYPTPROV *, LPCWSTR, LPCWSTR,
 163                                     DWORD, DWORD);
 164 typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV, DWORD, BYTE *);
 165 typedef BOOL (WINAPI *CRYPTRELEASECONTEXT)(HCRYPTPROV, DWORD);
 166
 167 typedef HWND (WINAPI *GETFOREGROUNDWINDOW)(VOID);
 168 typedef BOOL (WINAPI *GETCURSORINFO)(PCURSORINFO);
 169 typedef DWORD (WINAPI *GETQUEUESTATUS)(UINT);
 170
 171 typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 172 typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
 173 typedef BOOL (WINAPI *HEAP32FIRST)(LPHEAPENTRY32, DWORD, size_t);
 174 typedef BOOL (WINAPI *HEAP32NEXT)(LPHEAPENTRY32);
 175 typedef BOOL (WINAPI *HEAP32LIST)(HANDLE, LPHEAPLIST32);
 176 typedef BOOL (WINAPI *PROCESS32)(HANDLE, LPPROCESSENTRY32);
 177 typedef BOOL (WINAPI *THREAD32)(HANDLE, LPTHREADENTRY32);
 178 typedef BOOL (WINAPI *MODULE32)(HANDLE, LPMODULEENTRY32);
 179
 180 #include <lmcons.h>
 181 #include <lmstats.h>
 182 #if 1 /* The NET API is Unicode only.  It requires the use of the UNICODE
 183        * macro.  When UNICODE is defined LPTSTR becomes LPWSTR.  LMSTR was
 184        * was added to the Platform SDK to allow the NET API to be used in
 185        * non-Unicode applications provided that Unicode strings were still
 186        * used for input.  LMSTR is defined as LPWSTR.
 187        */
 188 typedef NET_API_STATUS (NET_API_FUNCTION * NETSTATGET)
 189         (LPWSTR, LPWSTR, DWORD, DWORD, LPBYTE*);
 190 typedef NET_API_STATUS (NET_API_FUNCTION * NETFREE)(LPBYTE);
 191 #endif /* 1 */
 192 #endif /* !OPENSSL_SYS_WINCE */
 193
 194 int RAND_poll(void)
 195 {
 196         MEMORYSTATUS m;
 197         HCRYPTPROV hProvider = 0;
 198         DWORD w;
 199         int good = 0;
 200
 201
 202 #if defined(OPENSSL_SYS_WINCE)
 203 # if defined(_WIN32_WCE) && _WIN32_WCE>=300
 204 /* Even though MSDN says _WIN32_WCE>=210, it doesn't seem to be available
 205  * in commonly available implementations prior 300... */
 206         {
 207         BYTE buf[64];
 208         /* poll the CryptoAPI PRNG */
 209         /* The CryptoAPI returns sizeof(buf) bytes of randomness */
 210         if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL,
 211                                 CRYPT_VERIFYCONTEXT))
 212                 {
 213                 if (CryptGenRandom(hProvider, sizeof(buf), buf))
 214                         RAND_add(buf, sizeof(buf), sizeof(buf));
 215                 CryptReleaseContext(hProvider, 0);
 216                 }
 217         }
 218 # endif
 219 #else   /* OPENSSL_SYS_WINCE */
 220         /*
 221          * None of below libraries are present on Windows CE, which is
 222          * why we #ifndef the whole section. This also excuses us from
 223          * handling the GetProcAddress issue. The trouble is that in
 224          * real Win32 API GetProcAddress is available in ANSI flavor
 225          * only. In WinCE on the other hand GetProcAddress is a macro
 226          * most commonly defined as GetProcAddressW, which accepts
 227          * Unicode argument. If we were to call GetProcAddress under
 228          * WinCE, I'd recommend to either redefine GetProcAddress as
 229          * GetProcAddressA (there seem to be one in common CE spec) or
 230          * implement own shim routine, which would accept ANSI argument
 231          * and expand it to Unicode.
 232          */
 233         {
 234         /* load functions dynamically - not available on all systems */
 235         HMODULE advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
 236         HMODULE kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
 237         HMODULE user = NULL;
 238         HMODULE netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
 239         CRYPTACQUIRECONTEXTW acquire = NULL;
 240         CRYPTGENRANDOM gen = NULL;
 241         CRYPTRELEASECONTEXT release = NULL;
 242         NETSTATGET netstatget = NULL;
 243         NETFREE netfree = NULL;
 244         BYTE buf[64];
 245
 246         if (netapi)
 247                 {
 248                 netstatget = (NETSTATGET) GetProcAddress(netapi,"NetStatisticsGet");
 249                 netfree = (NETFREE) GetProcAddress(netapi,"NetApiBufferFree");
 250                 }
 251
 252         if (netstatget && netfree)
 253                 {
 254                 LPBYTE outbuf;
 255                 /* NetStatisticsGet() is a Unicode only function
 256                  * STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0
 257                  * contains 17 fields.  We treat each field as a source of
 258                  * one byte of entropy.
 259                  */
 260
 261                 if (netstatget(NULL, L"LanmanWorkstation", 0, 0, &outbuf) == 0)
 262                         {
 263                         RAND_add(outbuf, sizeof(STAT_WORKSTATION_0), 45);
 264                         netfree(outbuf);
 265                         }
 266                 if (netstatget(NULL, L"LanmanServer", 0, 0, &outbuf) == 0)
 267                         {
 268                         RAND_add(outbuf, sizeof(STAT_SERVER_0), 17);
 269                         netfree(outbuf);
 270                         }
 271                 }
 272
 273         if (netapi)
 274                 FreeLibrary(netapi);
 275
 276         /* It appears like this can cause an exception deep within ADVAPI32.DLL
 277          * at random times on Windows 2000.  Reported by Jeffrey Altman.
 278          * Only use it on NT.
 279          */
 280
 281         if (advapi)
 282                 {
 283                 /*
 284                  * If it's available, then it's available in both ANSI
 285                  * and UNICODE flavors even in Win9x, documentation says.
 286                  * We favor Unicode...
 287                  */
 288                 acquire = (CRYPTACQUIRECONTEXTW) GetProcAddress(advapi,
 289                         "CryptAcquireContextW");
 290                 gen = (CRYPTGENRANDOM) GetProcAddress(advapi,
 291                         "CryptGenRandom");
 292                 release = (CRYPTRELEASECONTEXT) GetProcAddress(advapi,
 293                         "CryptReleaseContext");
 294                 }
 295
 296         if (acquire && gen && release)
 297                 {
 298                 /* poll the CryptoAPI PRNG */
 299                 /* The CryptoAPI returns sizeof(buf) bytes of randomness */
 300                 if (acquire(&hProvider, NULL, NULL, PROV_RSA_FULL,
 301                         CRYPT_VERIFYCONTEXT))
 302                         {
 303                         if (gen(hProvider, sizeof(buf), buf) != 0)
 304                                 {
 305                                 RAND_add(buf, sizeof(buf), 0);
 306                                 good = 1;
 307 #if 0
 308                                 printf("randomness from PROV_RSA_FULL\n");
 309 #endif
 310                                 }
 311                         release(hProvider, 0);
 312                         }
 313
 314                 /* poll the Pentium PRG with CryptoAPI */
 315                 if (acquire(&hProvider, 0, INTEL_DEF_PROV, PROV_INTEL_SEC, 0))
 316                         {
 317                         if (gen(hProvider, sizeof(buf), buf) != 0)
 318                                 {
 319                                 RAND_add(buf, sizeof(buf), sizeof(buf));
 320                                 good = 1;
 321 #if 0
 322                                 printf("randomness from PROV_INTEL_SEC\n");
 323 #endif
 324                                 }
 325                         release(hProvider, 0);
 326                         }
 327                 }
 328
 329         if (advapi)
 330                 FreeLibrary(advapi);
 331
 332         if ((!check_winnt() ||
 333              !OPENSSL_isservice()) &&
 334             (user = LoadLibrary(TEXT("USER32.DLL"))))
 335                 {
 336                 GETCURSORINFO cursor;
 337                 GETFOREGROUNDWINDOW win;
 338                 GETQUEUESTATUS queue;
 339
 340                 win = (GETFOREGROUNDWINDOW) GetProcAddress(user, "GetForegroundWindow");
 341                 cursor = (GETCURSORINFO) GetProcAddress(user, "GetCursorInfo");
 342                 queue = (GETQUEUESTATUS) GetProcAddress(user, "GetQueueStatus");
 343
 344                 if (win)
 345                         {
 346                         /* window handle */
 347                         HWND h = win();
 348                         RAND_add(&h, sizeof(h), 0);
 349                         }
 350                 if (cursor)
 351                         {
 352                         /* unfortunately, its not safe to call GetCursorInfo()
 353                          * on NT4 even though it exists in SP3 (or SP6) and
 354                          * higher.
 355                          */
 356                         if (check_winnt() && !check_win_minplat(5))
 357                                 cursor = 0;
 358                         }
 359                 if (cursor)
 360                         {
 361                         /* cursor position */
 362                         /* assume 2 bytes of entropy */
 363                         CURSORINFO ci;
 364                         ci.cbSize = sizeof(CURSORINFO);
 365                         if (cursor(&ci))
 366                                 RAND_add(&ci, ci.cbSize, 2);
 367                         }
 368
 369                 if (queue)
 370                         {
 371                         /* message queue status */
 372                         /* assume 1 byte of entropy */
 373                         w = queue(QS_ALLEVENTS);
 374                         RAND_add(&w, sizeof(w), 1);
 375                         }
 376
 377                 FreeLibrary(user);
 378                 }
 379
 380         /*-
 381          * Toolhelp32 snapshot: enumerate processes, threads, modules and heap
 382          * http://msdn.microsoft.com/library/psdk/winbase/toolhelp_5pfd.htm
 383          * (Win 9x and 2000 only, not available on NT)
 384          *
 385          * This seeding method was proposed in Peter Gutmann, Software
 386          * Generation of Practically Strong Random Numbers,
 387          * http://www.usenix.org/publications/library/proceedings/sec98/gutmann.html
 388          * revised version at http://www.cryptoengines.com/~peter/06_random.pdf
 389          * (The assignment of entropy estimates below is arbitrary, but based
 390          * on Peter's analysis the full poll appears to be safe. Additional
 391          * interactive seeding is encouraged.)
 392          */
 393
 394         if (kernel)
 395                 {
 396                 CREATETOOLHELP32SNAPSHOT snap;
 397                 CLOSETOOLHELP32SNAPSHOT close_snap;
 398                 HANDLE handle;
 399
 400                 HEAP32FIRST heap_first;
 401                 HEAP32NEXT heap_next;
 402                 HEAP32LIST heaplist_first, heaplist_next;
 403                 PROCESS32 process_first, process_next;
 404                 THREAD32 thread_first, thread_next;
 405                 MODULE32 module_first, module_next;
 406
 407                 HEAPLIST32 hlist;
 408                 HEAPENTRY32 hentry;
 409                 PROCESSENTRY32 p;
 410                 THREADENTRY32 t;
 411                 MODULEENTRY32 m;
 412                 DWORD starttime = 0;
 413
 414                 snap = (CREATETOOLHELP32SNAPSHOT)
 415                         GetProcAddress(kernel, "CreateToolhelp32Snapshot");
 416                 close_snap = (CLOSETOOLHELP32SNAPSHOT)
 417                         GetProcAddress(kernel, "CloseToolhelp32Snapshot");
 418                 heap_first = (HEAP32FIRST) GetProcAddress(kernel, "Heap32First");
 419                 heap_next = (HEAP32NEXT) GetProcAddress(kernel, "Heap32Next");
 420                 heaplist_first = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListFirst");
 421                 heaplist_next = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListNext");
 422                 process_first = (PROCESS32) GetProcAddress(kernel, "Process32First");
 423                 process_next = (PROCESS32) GetProcAddress(kernel, "Process32Next");
 424                 thread_first = (THREAD32) GetProcAddress(kernel, "Thread32First");
 425                 thread_next = (THREAD32) GetProcAddress(kernel, "Thread32Next");
 426                 module_first = (MODULE32) GetProcAddress(kernel, "Module32First");
 427                 module_next = (MODULE32) GetProcAddress(kernel, "Module32Next");
 428
 429                 if (snap && heap_first && heap_next && heaplist_first &&
 430                         heaplist_next && process_first && process_next &&
 431                         thread_first && thread_next && module_first &&
 432                         module_next && (handle = snap(TH32CS_SNAPALL,0))
 433                         != INVALID_HANDLE_VALUE)
 434                         {
 435                         /* heap list and heap walking */
 436                         /* HEAPLIST32 contains 3 fields that will change with
 437                          * each entry.  Consider each field a source of 1 byte
 438                          * of entropy.
 439                          * HEAPENTRY32 contains 5 fields that will change with
 440                          * each entry.  Consider each field a source of 1 byte
 441                          * of entropy.
 442                          */
 443                         ZeroMemory(&hlist, sizeof(HEAPLIST32));
 444                         hlist.dwSize = sizeof(HEAPLIST32);
 445                         if (good) starttime = GetTickCount();
 446 #ifdef _MSC_VER
 447                         if (heaplist_first(handle, &hlist))
 448                                 {
 449                                 /*
 450                                    following discussion on dev ML, exception on WinCE (or other Win
 451                                    platform) is theoretically of unknown origin; prevent infinite
 452                                    loop here when this theoretical case occurs; otherwise cope with
 453                                    the expected (MSDN documented) exception-throwing behaviour of
 454                                    Heap32Next() on WinCE.
 455
 456                                    based on patch in original message by Tanguy Fautré (2009/03/02)
 457                                    Subject: RAND_poll() and CreateToolhelp32Snapshot() stability
 458                              */
 459                                 int ex_cnt_limit = 42;
 460                                 do
 461                                         {
 462                                         RAND_add(&hlist, hlist.dwSize, 3);
 463                                         __try
 464                                                 {
 465                                                 ZeroMemory(&hentry, sizeof(HEAPENTRY32));
 466                                         hentry.dwSize = sizeof(HEAPENTRY32);
 467                                         if (heap_first(&hentry,
 468                                                 hlist.th32ProcessID,
 469                                                 hlist.th32HeapID))
 470                                                 {
 471                                                 int entrycnt = 80;
 472                                                 do
 473                                                         RAND_add(&hentry,
 474                                                                 hentry.dwSize, 5);
 475                                                 while (heap_next(&hentry)
 476                                                 && (!good || (GetTickCount()-starttime)<MAXDELAY)
 477                                                         && --entrycnt > 0);
 478                                                 }
 479                                                 }
 480                                         __except (EXCEPTION_EXECUTE_HANDLER)
 481                                                 {
 482                                                         /* ignore access violations when walking the heap list */
 483                                                         ex_cnt_limit--;
 484                                                 }
 485                                         } while (heaplist_next(handle, &hlist)
 486                                                 && (!good || (GetTickCount()-starttime)<MAXDELAY)
 487                                                 && ex_cnt_limit > 0);
 488                                 }
 489
 490 #else
 491                         if (heaplist_first(handle, &hlist))
 492                                 {
 493                                 do
 494                                         {
 495                                         RAND_add(&hlist, hlist.dwSize, 3);
 496                                         hentry.dwSize = sizeof(HEAPENTRY32);
 497                                         if (heap_first(&hentry,
 498                                                 hlist.th32ProcessID,
 499                                                 hlist.th32HeapID))
 500                                                 {
 501                                                 int entrycnt = 80;
 502                                                 do
 503                                                         RAND_add(&hentry,
 504                                                                 hentry.dwSize, 5);
 505                                                 while (heap_next(&hentry)
 506                                                         && --entrycnt > 0);
 507                                                 }
 508                                         } while (heaplist_next(handle, &hlist)
 509                                                 && (!good || (GetTickCount()-starttime)<MAXDELAY));
 510                                 }
 511 #endif
 512
 513                         /* process walking */
 514                         /* PROCESSENTRY32 contains 9 fields that will change
 515                          * with each entry.  Consider each field a source of
 516                          * 1 byte of entropy.
 517                          */
 518                         p.dwSize = sizeof(PROCESSENTRY32);
 519
 520                         if (good) starttime = GetTickCount();
 521                         if (process_first(handle, &p))
 522                                 do
 523                                         RAND_add(&p, p.dwSize, 9);
 524                                 while (process_next(handle, &p) && (!good || (GetTickCount()-starttime)<MAXDELAY));
 525
 526                         /* thread walking */
 527                         /* THREADENTRY32 contains 6 fields that will change
 528                          * with each entry.  Consider each field a source of
 529                          * 1 byte of entropy.
 530                          */
 531                         t.dwSize = sizeof(THREADENTRY32);
 532                         if (good) starttime = GetTickCount();
 533                         if (thread_first(handle, &t))
 534                                 do
 535                                         RAND_add(&t, t.dwSize, 6);
 536                                 while (thread_next(handle, &t) && (!good || (GetTickCount()-starttime)<MAXDELAY));
 537
 538                         /* module walking */
 539                         /* MODULEENTRY32 contains 9 fields that will change
 540                          * with each entry.  Consider each field a source of
 541                          * 1 byte of entropy.
 542                          */
 543                         m.dwSize = sizeof(MODULEENTRY32);
 544                         if (good) starttime = GetTickCount();
 545                         if (module_first(handle, &m))
 546                                 do
 547                                         RAND_add(&m, m.dwSize, 9);
 548                                 while (module_next(handle, &m)
 549                                                 && (!good || (GetTickCount()-starttime)<MAXDELAY));
 550                         if (close_snap)
 551                                 close_snap(handle);
 552                         else
 553                                 CloseHandle(handle);
 554
 555                         }
 556
 557                 FreeLibrary(kernel);
 558                 }
 559         }
 560 #endif /* !OPENSSL_SYS_WINCE */
 561
 562         /* timer data */
 563         readtimer();
 564
 565         /* memory usage statistics */
 566         GlobalMemoryStatus(&m);
 567         RAND_add(&m, sizeof(m), 1);
 568
 569         /* process ID */
 570         w = GetCurrentProcessId();
 571         RAND_add(&w, sizeof(w), 1);
 572
 573 #if 0
 574         printf("Exiting RAND_poll\n");
 575 #endif
 576
 577         return(1);
 578 }
 579
 580 int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
 581         {
 582         double add_entropy=0;
 583
 584         switch (iMsg)
 585                 {
 586         case WM_KEYDOWN:
 587                         {
 588                         static WPARAM key;
 589                         if (key != wParam)
 590                                 add_entropy = 0.05;
 591                         key = wParam;
 592                         }
 593                         break;
 594         case WM_MOUSEMOVE:
 595                         {
 596                         static int lastx,lasty,lastdx,lastdy;
 597                         int x,y,dx,dy;
 598
 599                         x=LOWORD(lParam);
 600                         y=HIWORD(lParam);
 601                         dx=lastx-x;
 602                         dy=lasty-y;
 603                         if (dx != 0 && dy != 0 && dx-lastdx != 0 && dy-lastdy != 0)
 604                                 add_entropy=.2;
 605                         lastx=x, lasty=y;
 606                         lastdx=dx, lastdy=dy;
 607                         }
 608                 break;
 609                 }
 610
 611         readtimer();
 612         RAND_add(&iMsg, sizeof(iMsg), add_entropy);
 613         RAND_add(&wParam, sizeof(wParam), 0);
 614         RAND_add(&lParam, sizeof(lParam), 0);
 615
 616         return (RAND_status());
 617         }
 618
 619
 620 void RAND_screen(void) /* function available for backward compatibility */
 621 {
 622         RAND_poll();
 623         readscreen();
 624 }
 625
 626
 627 /* feed timing information to the PRNG */
 628 static void readtimer(void)
 629 {
 630         DWORD w;
 631         LARGE_INTEGER l;
 632         static int have_perfc = 1;
 633 #if defined(_MSC_VER) && defined(_M_X86)
 634         static int have_tsc = 1;
 635         DWORD cyclecount;
 636
 637         if (have_tsc) {
 638           __try {
 639             __asm {
 640               _emit 0x0f
 641               _emit 0x31
 642               mov cyclecount, eax
 643               }
 644             RAND_add(&cyclecount, sizeof(cyclecount), 1);
 645           } __except(EXCEPTION_EXECUTE_HANDLER) {
 646             have_tsc = 0;
 647           }
 648         }
 649 #else
 650 # define have_tsc 0
 651 #endif
 652
 653         if (have_perfc) {
 654           if (QueryPerformanceCounter(&l) == 0)
 655             have_perfc = 0;
 656           else
 657             RAND_add(&l, sizeof(l), 0);
 658         }
 659
 660         if (!have_tsc && !have_perfc) {
 661           w = GetTickCount();
 662           RAND_add(&w, sizeof(w), 0);
 663         }
 664 }
 665
 666 /* feed screen contents to PRNG */
 667 /*****************************************************************************
 668  *
 669  * Created 960901 by Gertjan van Oosten, gertjan@West.NL, West Consulting B.V.
 670  *
 671  * Code adapted from
 672  * <URL:http://support.microsoft.com/default.aspx?scid=kb;[LN];97193>;
 673  * the original copyright message is:
 674  *
 675  *   (C) Copyright Microsoft Corp. 1993.  All rights reserved.
 676  *
 677  *   You have a royalty-free right to use, modify, reproduce and
 678  *   distribute the Sample Files (and/or any modified version) in
 679  *   any way you find useful, provided that you agree that
 680  *   Microsoft has no warranty obligations or liability for any
 681  *   Sample Application Files which are modified.
 682  */
 683
 684 static void readscreen(void)
 685 {
 686 #if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN)
 687   HDC           hScrDC;         /* screen DC */
 688   HBITMAP       hBitmap;        /* handle for our bitmap */
 689   BITMAP        bm;             /* bitmap properties */
 690   unsigned int  size;           /* size of bitmap */
 691   char          *bmbits;        /* contents of bitmap */
 692   int           w;              /* screen width */
 693   int           h;              /* screen height */
 694   int           y;              /* y-coordinate of screen lines to grab */
 695   int           n = 16;         /* number of screen lines to grab at a time */
 696   BITMAPINFOHEADER bi;          /* info about the bitmap */
 697
 698   if (check_winnt() && OPENSSL_isservice()>0)
 699     return;
 700
 701   /* Get a reference to the screen DC */
 702   hScrDC = GetDC(NULL);
 703
 704   /* Get screen resolution */
 705   w = GetDeviceCaps(hScrDC, HORZRES);
 706   h = GetDeviceCaps(hScrDC, VERTRES);
 707
 708   /* Create a bitmap compatible with the screen DC */
 709   hBitmap = CreateCompatibleBitmap(hScrDC, w, n);
 710
 711   /* Get bitmap properties */
 712   GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
 713   size = (unsigned int)bm.bmWidthBytes * bm.bmHeight * bm.bmPlanes;
 714
 715   bi.biSize = sizeof(BITMAPINFOHEADER);
 716   bi.biWidth = bm.bmWidth;
 717   bi.biHeight = bm.bmHeight;
 718   bi.biPlanes = bm.bmPlanes;
 719   bi.biBitCount = bm.bmBitsPixel;
 720   bi.biCompression = BI_RGB;
 721   bi.biSizeImage = 0;
 722   bi.biXPelsPerMeter = 0;
 723   bi.biYPelsPerMeter = 0;
 724   bi.biClrUsed = 0;
 725   bi.biClrImportant = 0;
 726
 727   bmbits = OPENSSL_malloc(size);
 728   if (bmbits) {
 729     /* Now go through the whole screen, repeatedly grabbing n lines */
 730     for (y = 0; y < h-n; y += n)
 731         {
 732         unsigned char md[MD_DIGEST_LENGTH];
 733
 734         /* Copy the bits of the current line range into the buffer */
 735         GetDIBits(hScrDC, hBitmap, y, n,
 736                   bmbits, (BITMAPINFO *)&bi, DIB_RGB_COLORS);
 737
 738         /* Get the hash of the bitmap */
 739         MD(bmbits,size,md);
 740
 741         /* Seed the random generator with the hash value */
 742         RAND_add(md, MD_DIGEST_LENGTH, 0);
 743         }
 744
 745     OPENSSL_free(bmbits);
 746   }
 747
 748   /* Clean up */
 749   DeleteObject(hBitmap);
 750   ReleaseDC(NULL, hScrDC);
 751 #endif /* !OPENSSL_SYS_WINCE */
 752 }
 753
 754 #endif