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rand_win.c
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1 /* crypto/rand/rand_win.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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
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  * ([email protected]). This product includes software written by Tim
108  * Hudson ([email protected]).
109  *
110  */
111 
112 #include "cryptlib.h"
113 #include <openssl/rand.h>
114 #include "rand_lcl.h"
115 
116 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
117 #include <windows.h>
118 #ifndef _WIN32_WINNT
119 # define _WIN32_WINNT 0x0400
120 #endif
121 #include <wincrypt.h>
122 #include <tlhelp32.h>
123 
124 /* Limit the time spent walking through the heap, processes, threads and modules to
125  a maximum of 1000 miliseconds each, unless CryptoGenRandom failed */
126 #define MAXDELAY 1000
127 
128 /* Intel hardware RNG CSP -- available from
129  * http://developer.intel.com/design/security/rng/redist_license.htm
130  */
131 #define PROV_INTEL_SEC 22
132 #define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
133 
134 static void readtimer(void);
135 static void readscreen(void);
136 
137 /* It appears like CURSORINFO, PCURSORINFO and LPCURSORINFO are only defined
138  when WINVER is 0x0500 and up, which currently only happens on Win2000.
139  Unfortunately, those are typedefs, so they're a little bit difficult to
140  detect properly. On the other hand, the macro CURSOR_SHOWING is defined
141  within the same conditional, so it can be use to detect the absence of said
142  typedefs. */
143 
144 #ifndef CURSOR_SHOWING
145 /*
146  * Information about the global cursor.
147  */
148 typedef struct tagCURSORINFO
149 {
150  DWORD cbSize;
151  DWORD flags;
152  HCURSOR hCursor;
153  POINT ptScreenPos;
154 } CURSORINFO, *PCURSORINFO, *LPCURSORINFO;
155 
156 #define CURSOR_SHOWING 0x00000001
157 #endif /* CURSOR_SHOWING */
158 
159 #if !defined(OPENSSL_SYS_WINCE)
160 typedef BOOL (WINAPI *CRYPTACQUIRECONTEXTW)(HCRYPTPROV *, LPCWSTR, LPCWSTR,
161  DWORD, DWORD);
162 typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV, DWORD, BYTE *);
163 typedef BOOL (WINAPI *CRYPTRELEASECONTEXT)(HCRYPTPROV, DWORD);
164 
165 typedef HWND (WINAPI *GETFOREGROUNDWINDOW)(VOID);
166 typedef BOOL (WINAPI *GETCURSORINFO)(PCURSORINFO);
167 typedef DWORD (WINAPI *GETQUEUESTATUS)(UINT);
168 
169 typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
170 typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
171 typedef BOOL (WINAPI *HEAP32FIRST)(LPHEAPENTRY32, DWORD, size_t);
172 typedef BOOL (WINAPI *HEAP32NEXT)(LPHEAPENTRY32);
173 typedef BOOL (WINAPI *HEAP32LIST)(HANDLE, LPHEAPLIST32);
174 typedef BOOL (WINAPI *PROCESS32)(HANDLE, LPPROCESSENTRY32);
175 typedef BOOL (WINAPI *THREAD32)(HANDLE, LPTHREADENTRY32);
176 typedef BOOL (WINAPI *MODULE32)(HANDLE, LPMODULEENTRY32);
177 
178 #include <lmcons.h>
179 #include <lmstats.h>
180 #if 1 /* The NET API is Unicode only. It requires the use of the UNICODE
181  * macro. When UNICODE is defined LPTSTR becomes LPWSTR. LMSTR was
182  * was added to the Platform SDK to allow the NET API to be used in
183  * non-Unicode applications provided that Unicode strings were still
184  * used for input. LMSTR is defined as LPWSTR.
185  */
186 typedef NET_API_STATUS (NET_API_FUNCTION * NETSTATGET)
187  (LPWSTR, LPWSTR, DWORD, DWORD, LPBYTE*);
188 typedef NET_API_STATUS (NET_API_FUNCTION * NETFREE)(LPBYTE);
189 #endif /* 1 */
190 #endif /* !OPENSSL_SYS_WINCE */
191 
192 int RAND_poll(void)
193 {
194  MEMORYSTATUS m;
195  HCRYPTPROV hProvider = 0;
196  DWORD w;
197  int good = 0;
198 
199  /* Determine the OS version we are on so we can turn off things
200  * that do not work properly.
201  */
202  OSVERSIONINFO osverinfo ;
203  osverinfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO) ;
204  GetVersionEx( &osverinfo ) ;
205 
206 #if defined(OPENSSL_SYS_WINCE)
207 # if defined(_WIN32_WCE) && _WIN32_WCE>=300
208 /* Even though MSDN says _WIN32_WCE>=210, it doesn't seem to be available
209  * in commonly available implementations prior 300... */
210  {
211  BYTE buf[64];
212  /* poll the CryptoAPI PRNG */
213  /* The CryptoAPI returns sizeof(buf) bytes of randomness */
214  if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL,
215  CRYPT_VERIFYCONTEXT))
216  {
217  if (CryptGenRandom(hProvider, sizeof(buf), buf))
218  RAND_add(buf, sizeof(buf), sizeof(buf));
219  CryptReleaseContext(hProvider, 0);
220  }
221  }
222 # endif
223 #else /* OPENSSL_SYS_WINCE */
224  /*
225  * None of below libraries are present on Windows CE, which is
226  * why we #ifndef the whole section. This also excuses us from
227  * handling the GetProcAddress issue. The trouble is that in
228  * real Win32 API GetProcAddress is available in ANSI flavor
229  * only. In WinCE on the other hand GetProcAddress is a macro
230  * most commonly defined as GetProcAddressW, which accepts
231  * Unicode argument. If we were to call GetProcAddress under
232  * WinCE, I'd recommend to either redefine GetProcAddress as
233  * GetProcAddressA (there seem to be one in common CE spec) or
234  * implement own shim routine, which would accept ANSI argument
235  * and expand it to Unicode.
236  */
237  {
238  /* load functions dynamically - not available on all systems */
239  HMODULE advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
240  HMODULE kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
241  HMODULE user = NULL;
242  HMODULE netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
243  CRYPTACQUIRECONTEXTW acquire = NULL;
244  CRYPTGENRANDOM gen = NULL;
245  CRYPTRELEASECONTEXT release = NULL;
246  NETSTATGET netstatget = NULL;
247  NETFREE netfree = NULL;
248  BYTE buf[64];
249 
250  if (netapi)
251  {
252  netstatget = (NETSTATGET) GetProcAddress(netapi,"NetStatisticsGet");
253  netfree = (NETFREE) GetProcAddress(netapi,"NetApiBufferFree");
254  }
255 
256  if (netstatget && netfree)
257  {
258  LPBYTE outbuf;
259  /* NetStatisticsGet() is a Unicode only function
260  * STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0
261  * contains 17 fields. We treat each field as a source of
262  * one byte of entropy.
263  */
264 
265  if (netstatget(NULL, L"LanmanWorkstation", 0, 0, &outbuf) == 0)
266  {
267  RAND_add(outbuf, sizeof(STAT_WORKSTATION_0), 45);
268  netfree(outbuf);
269  }
270  if (netstatget(NULL, L"LanmanServer", 0, 0, &outbuf) == 0)
271  {
272  RAND_add(outbuf, sizeof(STAT_SERVER_0), 17);
273  netfree(outbuf);
274  }
275  }
276 
277  if (netapi)
278  FreeLibrary(netapi);
279 
280  /* It appears like this can cause an exception deep within ADVAPI32.DLL
281  * at random times on Windows 2000. Reported by Jeffrey Altman.
282  * Only use it on NT.
283  */
284  /* Wolfgang Marczy <[email protected]> reports that
285  * the RegQueryValueEx call below can hang on NT4.0 (SP6).
286  * So we don't use this at all for now. */
287 #if 0
288  if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT &&
289  osverinfo.dwMajorVersion < 5)
290  {
291  /* Read Performance Statistics from NT/2000 registry
292  * The size of the performance data can vary from call
293  * to call so we must guess the size of the buffer to use
294  * and increase its size if we get an ERROR_MORE_DATA
295  * return instead of ERROR_SUCCESS.
296  */
297  LONG rc=ERROR_MORE_DATA;
298  char * buf=NULL;
299  DWORD bufsz=0;
300  DWORD length;
301 
302  while (rc == ERROR_MORE_DATA)
303  {
304  buf = realloc(buf,bufsz+8192);
305  if (!buf)
306  break;
307  bufsz += 8192;
308 
309  length = bufsz;
310  rc = RegQueryValueEx(HKEY_PERFORMANCE_DATA, TEXT("Global"),
311  NULL, NULL, buf, &length);
312  }
313  if (rc == ERROR_SUCCESS)
314  {
315  /* For entropy count assume only least significant
316  * byte of each DWORD is random.
317  */
318  RAND_add(&length, sizeof(length), 0);
319  RAND_add(buf, length, length / 4.0);
320 
321  /* Close the Registry Key to allow Windows to cleanup/close
322  * the open handle
323  * Note: The 'HKEY_PERFORMANCE_DATA' key is implicitly opened
324  * when the RegQueryValueEx above is done. However, if
325  * it is not explicitly closed, it can cause disk
326  * partition manipulation problems.
327  */
328  RegCloseKey(HKEY_PERFORMANCE_DATA);
329  }
330  if (buf)
331  free(buf);
332  }
333 #endif
334 
335  if (advapi)
336  {
337  /*
338  * If it's available, then it's available in both ANSI
339  * and UNICODE flavors even in Win9x, documentation says.
340  * We favor Unicode...
341  */
342  acquire = (CRYPTACQUIRECONTEXTW) GetProcAddress(advapi,
343  "CryptAcquireContextW");
344  gen = (CRYPTGENRANDOM) GetProcAddress(advapi,
345  "CryptGenRandom");
346  release = (CRYPTRELEASECONTEXT) GetProcAddress(advapi,
347  "CryptReleaseContext");
348  }
349 
350  if (acquire && gen && release)
351  {
352  /* poll the CryptoAPI PRNG */
353  /* The CryptoAPI returns sizeof(buf) bytes of randomness */
354  if (acquire(&hProvider, NULL, NULL, PROV_RSA_FULL,
355  CRYPT_VERIFYCONTEXT))
356  {
357  if (gen(hProvider, sizeof(buf), buf) != 0)
358  {
359  RAND_add(buf, sizeof(buf), 0);
360  good = 1;
361 #if 0
362  printf("randomness from PROV_RSA_FULL\n");
363 #endif
364  }
365  release(hProvider, 0);
366  }
367 
368  /* poll the Pentium PRG with CryptoAPI */
369  if (acquire(&hProvider, 0, INTEL_DEF_PROV, PROV_INTEL_SEC, 0))
370  {
371  if (gen(hProvider, sizeof(buf), buf) != 0)
372  {
373  RAND_add(buf, sizeof(buf), sizeof(buf));
374  good = 1;
375 #if 0
376  printf("randomness from PROV_INTEL_SEC\n");
377 #endif
378  }
379  release(hProvider, 0);
380  }
381  }
382 
383  if (advapi)
384  FreeLibrary(advapi);
385 
386  if ((osverinfo.dwPlatformId != VER_PLATFORM_WIN32_NT ||
387  !OPENSSL_isservice()) &&
388  (user = LoadLibrary(TEXT("USER32.DLL"))))
389  {
390  GETCURSORINFO cursor;
391  GETFOREGROUNDWINDOW win;
392  GETQUEUESTATUS queue;
393 
394  win = (GETFOREGROUNDWINDOW) GetProcAddress(user, "GetForegroundWindow");
395  cursor = (GETCURSORINFO) GetProcAddress(user, "GetCursorInfo");
396  queue = (GETQUEUESTATUS) GetProcAddress(user, "GetQueueStatus");
397 
398  if (win)
399  {
400  /* window handle */
401  HWND h = win();
402  RAND_add(&h, sizeof(h), 0);
403  }
404  if (cursor)
405  {
406  /* unfortunately, its not safe to call GetCursorInfo()
407  * on NT4 even though it exists in SP3 (or SP6) and
408  * higher.
409  */
410  if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT &&
411  osverinfo.dwMajorVersion < 5)
412  cursor = 0;
413  }
414  if (cursor)
415  {
416  /* cursor position */
417  /* assume 2 bytes of entropy */
418  CURSORINFO ci;
419  ci.cbSize = sizeof(CURSORINFO);
420  if (cursor(&ci))
421  RAND_add(&ci, ci.cbSize, 2);
422  }
423 
424  if (queue)
425  {
426  /* message queue status */
427  /* assume 1 byte of entropy */
428  w = queue(QS_ALLEVENTS);
429  RAND_add(&w, sizeof(w), 1);
430  }
431 
432  FreeLibrary(user);
433  }
434 
435  /* Toolhelp32 snapshot: enumerate processes, threads, modules and heap
436  * http://msdn.microsoft.com/library/psdk/winbase/toolhelp_5pfd.htm
437  * (Win 9x and 2000 only, not available on NT)
438  *
439  * This seeding method was proposed in Peter Gutmann, Software
440  * Generation of Practically Strong Random Numbers,
441  * http://www.usenix.org/publications/library/proceedings/sec98/gutmann.html
442  * revised version at http://www.cryptoengines.com/~peter/06_random.pdf
443  * (The assignment of entropy estimates below is arbitrary, but based
444  * on Peter's analysis the full poll appears to be safe. Additional
445  * interactive seeding is encouraged.)
446  */
447 
448  if (kernel)
449  {
450  CREATETOOLHELP32SNAPSHOT snap;
451  CLOSETOOLHELP32SNAPSHOT close_snap;
452  HANDLE handle;
453 
454  HEAP32FIRST heap_first;
455  HEAP32NEXT heap_next;
456  HEAP32LIST heaplist_first, heaplist_next;
457  PROCESS32 process_first, process_next;
458  THREAD32 thread_first, thread_next;
459  MODULE32 module_first, module_next;
460 
461  HEAPLIST32 hlist;
462  HEAPENTRY32 hentry;
465  MODULEENTRY32 m;
466  DWORD starttime = 0;
467 
468  snap = (CREATETOOLHELP32SNAPSHOT)
469  GetProcAddress(kernel, "CreateToolhelp32Snapshot");
470  close_snap = (CLOSETOOLHELP32SNAPSHOT)
471  GetProcAddress(kernel, "CloseToolhelp32Snapshot");
472  heap_first = (HEAP32FIRST) GetProcAddress(kernel, "Heap32First");
473  heap_next = (HEAP32NEXT) GetProcAddress(kernel, "Heap32Next");
474  heaplist_first = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListFirst");
475  heaplist_next = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListNext");
476  process_first = (PROCESS32) GetProcAddress(kernel, "Process32First");
477  process_next = (PROCESS32) GetProcAddress(kernel, "Process32Next");
478  thread_first = (THREAD32) GetProcAddress(kernel, "Thread32First");
479  thread_next = (THREAD32) GetProcAddress(kernel, "Thread32Next");
480  module_first = (MODULE32) GetProcAddress(kernel, "Module32First");
481  module_next = (MODULE32) GetProcAddress(kernel, "Module32Next");
482 
483  if (snap && heap_first && heap_next && heaplist_first &&
484  heaplist_next && process_first && process_next &&
485  thread_first && thread_next && module_first &&
486  module_next && (handle = snap(TH32CS_SNAPALL,0))
487  != INVALID_HANDLE_VALUE)
488  {
489  /* heap list and heap walking */
490  /* HEAPLIST32 contains 3 fields that will change with
491  * each entry. Consider each field a source of 1 byte
492  * of entropy.
493  * HEAPENTRY32 contains 5 fields that will change with
494  * each entry. Consider each field a source of 1 byte
495  * of entropy.
496  */
497  ZeroMemory(&hlist, sizeof(HEAPLIST32));
498  hlist.dwSize = sizeof(HEAPLIST32);
499  if (good) starttime = GetTickCount();
500 #ifdef _MSC_VER
501  if (heaplist_first(handle, &hlist))
502  {
503  /*
504  following discussion on dev ML, exception on WinCE (or other Win
505  platform) is theoretically of unknown origin; prevent infinite
506  loop here when this theoretical case occurs; otherwise cope with
507  the expected (MSDN documented) exception-throwing behaviour of
508  Heap32Next() on WinCE.
509 
510  based on patch in original message by Tanguy Fautré (2009/03/02)
511  Subject: RAND_poll() and CreateToolhelp32Snapshot() stability
512  */
513  int ex_cnt_limit = 42;
514  do
515  {
516  RAND_add(&hlist, hlist.dwSize, 3);
517  __try
518  {
519  ZeroMemory(&hentry, sizeof(HEAPENTRY32));
520  hentry.dwSize = sizeof(HEAPENTRY32);
521  if (heap_first(&hentry,
522  hlist.th32ProcessID,
523  hlist.th32HeapID))
524  {
525  int entrycnt = 80;
526  do
527  RAND_add(&hentry,
528  hentry.dwSize, 5);
529  while (heap_next(&hentry)
530  && (!good || (GetTickCount()-starttime)<MAXDELAY)
531  && --entrycnt > 0);
532  }
533  }
534  __except (EXCEPTION_EXECUTE_HANDLER)
535  {
536  /* ignore access violations when walking the heap list */
537  ex_cnt_limit--;
538  }
539  } while (heaplist_next(handle, &hlist)
540  && (!good || (GetTickCount()-starttime)<MAXDELAY)
541  && ex_cnt_limit > 0);
542  }
543 
544 #else
545  if (heaplist_first(handle, &hlist))
546  {
547  do
548  {
549  RAND_add(&hlist, hlist.dwSize, 3);
550  hentry.dwSize = sizeof(HEAPENTRY32);
551  if (heap_first(&hentry,
552  hlist.th32ProcessID,
553  hlist.th32HeapID))
554  {
555  int entrycnt = 80;
556  do
557  RAND_add(&hentry,
558  hentry.dwSize, 5);
559  while (heap_next(&hentry)
560  && --entrycnt > 0);
561  }
562  } while (heaplist_next(handle, &hlist)
563  && (!good || (GetTickCount()-starttime)<MAXDELAY));
564  }
565 #endif
566 
567  /* process walking */
568  /* PROCESSENTRY32 contains 9 fields that will change
569  * with each entry. Consider each field a source of
570  * 1 byte of entropy.
571  */
572  p.dwSize = sizeof(PROCESSENTRY32);
573 
574  if (good) starttime = GetTickCount();
575  if (process_first(handle, &p))
576  do
577  RAND_add(&p, p.dwSize, 9);
578  while (process_next(handle, &p) && (!good || (GetTickCount()-starttime)<MAXDELAY));
579 
580  /* thread walking */
581  /* THREADENTRY32 contains 6 fields that will change
582  * with each entry. Consider each field a source of
583  * 1 byte of entropy.
584  */
585  t.dwSize = sizeof(THREADENTRY32);
586  if (good) starttime = GetTickCount();
587  if (thread_first(handle, &t))
588  do
589  RAND_add(&t, t.dwSize, 6);
590  while (thread_next(handle, &t) && (!good || (GetTickCount()-starttime)<MAXDELAY));
591 
592  /* module walking */
593  /* MODULEENTRY32 contains 9 fields that will change
594  * with each entry. Consider each field a source of
595  * 1 byte of entropy.
596  */
597  m.dwSize = sizeof(MODULEENTRY32);
598  if (good) starttime = GetTickCount();
599  if (module_first(handle, &m))
600  do
601  RAND_add(&m, m.dwSize, 9);
602  while (module_next(handle, &m)
603  && (!good || (GetTickCount()-starttime)<MAXDELAY));
604  if (close_snap)
605  close_snap(handle);
606  else
607  CloseHandle(handle);
608 
609  }
610 
611  FreeLibrary(kernel);
612  }
613  }
614 #endif /* !OPENSSL_SYS_WINCE */
615 
616  /* timer data */
617  readtimer();
618 
619  /* memory usage statistics */
620  GlobalMemoryStatus(&m);
621  RAND_add(&m, sizeof(m), 1);
622 
623  /* process ID */
624  w = GetCurrentProcessId();
625  RAND_add(&w, sizeof(w), 1);
626 
627 #if 0
628  printf("Exiting RAND_poll\n");
629 #endif
630 
631  return(1);
632 }
633 
634 int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
635  {
636  double add_entropy=0;
637 
638  switch (iMsg)
639  {
640  case WM_KEYDOWN:
641  {
642  static WPARAM key;
643  if (key != wParam)
644  add_entropy = 0.05;
645  key = wParam;
646  }
647  break;
648  case WM_MOUSEMOVE:
649  {
650  static int lastx,lasty,lastdx,lastdy;
651  int x,y,dx,dy;
652 
653  x=LOWORD(lParam);
654  y=HIWORD(lParam);
655  dx=lastx-x;
656  dy=lasty-y;
657  if (dx != 0 && dy != 0 && dx-lastdx != 0 && dy-lastdy != 0)
658  add_entropy=.2;
659  lastx=x, lasty=y;
660  lastdx=dx, lastdy=dy;
661  }
662  break;
663  }
664 
665  readtimer();
666  RAND_add(&iMsg, sizeof(iMsg), add_entropy);
667  RAND_add(&wParam, sizeof(wParam), 0);
668  RAND_add(&lParam, sizeof(lParam), 0);
669 
670  return (RAND_status());
671  }
672 
673 
674 void RAND_screen(void) /* function available for backward compatibility */
675 {
676  RAND_poll();
677  readscreen();
678 }
679 
680 
681 /* feed timing information to the PRNG */
682 static void readtimer(void)
683 {
684  DWORD w;
685  LARGE_INTEGER l;
686  static int have_perfc = 1;
687 #if defined(_MSC_VER) && defined(_M_X86)
688  static int have_tsc = 1;
689  DWORD cyclecount;
690 
691  if (have_tsc) {
692  __try {
693  __asm {
694  _emit 0x0f
695  _emit 0x31
696  mov cyclecount, eax
697  }
698  RAND_add(&cyclecount, sizeof(cyclecount), 1);
699  } __except(EXCEPTION_EXECUTE_HANDLER) {
700  have_tsc = 0;
701  }
702  }
703 #else
704 # define have_tsc 0
705 #endif
706 
707  if (have_perfc) {
708  if (QueryPerformanceCounter(&l) == 0)
709  have_perfc = 0;
710  else
711  RAND_add(&l, sizeof(l), 0);
712  }
713 
714  if (!have_tsc && !have_perfc) {
715  w = GetTickCount();
716  RAND_add(&w, sizeof(w), 0);
717  }
718 }
719 
720 /* feed screen contents to PRNG */
721 /*****************************************************************************
722  *
723  * Created 960901 by Gertjan van Oosten, [email protected], West Consulting B.V.
724  *
725  * Code adapted from
726  * <URL:http://support.microsoft.com/default.aspx?scid=kb;[LN];97193>;
727  * the original copyright message is:
728  *
729  * (C) Copyright Microsoft Corp. 1993. All rights reserved.
730  *
731  * You have a royalty-free right to use, modify, reproduce and
732  * distribute the Sample Files (and/or any modified version) in
733  * any way you find useful, provided that you agree that
734  * Microsoft has no warranty obligations or liability for any
735  * Sample Application Files which are modified.
736  */
737 
738 static void readscreen(void)
739 {
740 #if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN)
741  HDC hScrDC; /* screen DC */
742  HDC hMemDC; /* memory DC */
743  HBITMAP hBitmap; /* handle for our bitmap */
744  HBITMAP hOldBitmap; /* handle for previous bitmap */
745  BITMAP bm; /* bitmap properties */
746  unsigned int size; /* size of bitmap */
747  char *bmbits; /* contents of bitmap */
748  int w; /* screen width */
749  int h; /* screen height */
750  int y; /* y-coordinate of screen lines to grab */
751  int n = 16; /* number of screen lines to grab at a time */
752 
753  if (GetVersion() < 0x80000000 && OPENSSL_isservice()>0)
754  return;
755 
756  /* Create a screen DC and a memory DC compatible to screen DC */
757  hScrDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);
758  hMemDC = CreateCompatibleDC(hScrDC);
759 
760  /* Get screen resolution */
761  w = GetDeviceCaps(hScrDC, HORZRES);
762  h = GetDeviceCaps(hScrDC, VERTRES);
763 
764  /* Create a bitmap compatible with the screen DC */
765  hBitmap = CreateCompatibleBitmap(hScrDC, w, n);
766 
767  /* Select new bitmap into memory DC */
768  hOldBitmap = SelectObject(hMemDC, hBitmap);
769 
770  /* Get bitmap properties */
771  GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
772  size = (unsigned int)bm.bmWidthBytes * bm.bmHeight * bm.bmPlanes;
773 
774  bmbits = OPENSSL_malloc(size);
775  if (bmbits) {
776  /* Now go through the whole screen, repeatedly grabbing n lines */
777  for (y = 0; y < h-n; y += n)
778  {
779  unsigned char md[MD_DIGEST_LENGTH];
780 
781  /* Bitblt screen DC to memory DC */
782  BitBlt(hMemDC, 0, 0, w, n, hScrDC, 0, y, SRCCOPY);
783 
784  /* Copy bitmap bits from memory DC to bmbits */
785  GetBitmapBits(hBitmap, size, bmbits);
786 
787  /* Get the hash of the bitmap */
788  MD(bmbits,size,md);
789 
790  /* Seed the random generator with the hash value */
791  RAND_add(md, MD_DIGEST_LENGTH, 0);
792  }
793 
794  OPENSSL_free(bmbits);
795  }
796 
797  /* Select old bitmap back into memory DC */
798  hBitmap = SelectObject(hMemDC, hOldBitmap);
799 
800  /* Clean up */
801  DeleteObject(hBitmap);
802  DeleteDC(hMemDC);
803  DeleteDC(hScrDC);
804 #endif /* !OPENSSL_SYS_WINCE */
805 }
806 
807 #endif