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Final(?) WinCE update.
[thirdparty/openssl.git] / 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 #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, ULONG_PTR);
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 <WMarczy@topcall.co.at> 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;
463 PROCESSENTRY32 p;
464 THREADENTRY32 t;
465 MODULEENTRY32 m;
466 DWORD stoptime = 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 hlist.dwSize = sizeof(HEAPLIST32);
498 if (good) stoptime = GetTickCount() + MAXDELAY;
499 if (heaplist_first(handle, &hlist))
500 do
501 {
502 RAND_add(&hlist, hlist.dwSize, 3);
503 hentry.dwSize = sizeof(HEAPENTRY32);
504 if (heap_first(&hentry,
505 hlist.th32ProcessID,
506 hlist.th32HeapID))
507 {
508 int entrycnt = 80;
509 do
510 RAND_add(&hentry,
511 hentry.dwSize, 5);
512 while (heap_next(&hentry)
513 && --entrycnt > 0);
514 }
515 } while (heaplist_next(handle,
516 &hlist) && GetTickCount() < stoptime);
517
518 /* process walking */
519 /* PROCESSENTRY32 contains 9 fields that will change
520 * with each entry. Consider each field a source of
521 * 1 byte of entropy.
522 */
523 p.dwSize = sizeof(PROCESSENTRY32);
524
525 if (good) stoptime = GetTickCount() + MAXDELAY;
526 if (process_first(handle, &p))
527 do
528 RAND_add(&p, p.dwSize, 9);
529 while (process_next(handle, &p) && GetTickCount() < stoptime);
530
531 /* thread walking */
532 /* THREADENTRY32 contains 6 fields that will change
533 * with each entry. Consider each field a source of
534 * 1 byte of entropy.
535 */
536 t.dwSize = sizeof(THREADENTRY32);
537 if (good) stoptime = GetTickCount() + MAXDELAY;
538 if (thread_first(handle, &t))
539 do
540 RAND_add(&t, t.dwSize, 6);
541 while (thread_next(handle, &t) && GetTickCount() < stoptime);
542
543 /* module walking */
544 /* MODULEENTRY32 contains 9 fields that will change
545 * with each entry. Consider each field a source of
546 * 1 byte of entropy.
547 */
548 m.dwSize = sizeof(MODULEENTRY32);
549 if (good) stoptime = GetTickCount() + MAXDELAY;
550 if (module_first(handle, &m))
551 do
552 RAND_add(&m, m.dwSize, 9);
553 while (module_next(handle, &m)
554 && (GetTickCount() < stoptime));
555 if (close_snap)
556 close_snap(handle);
557 else
558 CloseHandle(handle);
559
560 }
561
562 FreeLibrary(kernel);
563 }
564 }
565 #endif /* !OPENSSL_SYS_WINCE */
566
567 /* timer data */
568 readtimer();
569
570 /* memory usage statistics */
571 GlobalMemoryStatus(&m);
572 RAND_add(&m, sizeof(m), 1);
573
574 /* process ID */
575 w = GetCurrentProcessId();
576 RAND_add(&w, sizeof(w), 1);
577
578 #if 0
579 printf("Exiting RAND_poll\n");
580 #endif
581
582 return(1);
583 }
584
585 int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
586 {
587 double add_entropy=0;
588
589 switch (iMsg)
590 {
591 case WM_KEYDOWN:
592 {
593 static WPARAM key;
594 if (key != wParam)
595 add_entropy = 0.05;
596 key = wParam;
597 }
598 break;
599 case WM_MOUSEMOVE:
600 {
601 static int lastx,lasty,lastdx,lastdy;
602 int x,y,dx,dy;
603
604 x=LOWORD(lParam);
605 y=HIWORD(lParam);
606 dx=lastx-x;
607 dy=lasty-y;
608 if (dx != 0 && dy != 0 && dx-lastdx != 0 && dy-lastdy != 0)
609 add_entropy=.2;
610 lastx=x, lasty=y;
611 lastdx=dx, lastdy=dy;
612 }
613 break;
614 }
615
616 readtimer();
617 RAND_add(&iMsg, sizeof(iMsg), add_entropy);
618 RAND_add(&wParam, sizeof(wParam), 0);
619 RAND_add(&lParam, sizeof(lParam), 0);
620
621 return (RAND_status());
622 }
623
624
625 void RAND_screen(void) /* function available for backward compatibility */
626 {
627 RAND_poll();
628 readscreen();
629 }
630
631
632 /* feed timing information to the PRNG */
633 static void readtimer(void)
634 {
635 DWORD w;
636 LARGE_INTEGER l;
637 static int have_perfc = 1;
638 #if defined(_MSC_VER) && defined(_M_X86)
639 static int have_tsc = 1;
640 DWORD cyclecount;
641
642 if (have_tsc) {
643 __try {
644 __asm {
645 _emit 0x0f
646 _emit 0x31
647 mov cyclecount, eax
648 }
649 RAND_add(&cyclecount, sizeof(cyclecount), 1);
650 } __except(EXCEPTION_EXECUTE_HANDLER) {
651 have_tsc = 0;
652 }
653 }
654 #else
655 # define have_tsc 0
656 #endif
657
658 if (have_perfc) {
659 if (QueryPerformanceCounter(&l) == 0)
660 have_perfc = 0;
661 else
662 RAND_add(&l, sizeof(l), 0);
663 }
664
665 if (!have_tsc && !have_perfc) {
666 w = GetTickCount();
667 RAND_add(&w, sizeof(w), 0);
668 }
669 }
670
671 /* feed screen contents to PRNG */
672 /*****************************************************************************
673 *
674 * Created 960901 by Gertjan van Oosten, gertjan@West.NL, West Consulting B.V.
675 *
676 * Code adapted from
677 * <URL:http://support.microsoft.com/default.aspx?scid=kb;[LN];97193>;
678 * the original copyright message is:
679 *
680 * (C) Copyright Microsoft Corp. 1993. All rights reserved.
681 *
682 * You have a royalty-free right to use, modify, reproduce and
683 * distribute the Sample Files (and/or any modified version) in
684 * any way you find useful, provided that you agree that
685 * Microsoft has no warranty obligations or liability for any
686 * Sample Application Files which are modified.
687 */
688
689 static void readscreen(void)
690 {
691 #if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN)
692 HDC hScrDC; /* screen DC */
693 HDC hMemDC; /* memory DC */
694 HBITMAP hBitmap; /* handle for our bitmap */
695 HBITMAP hOldBitmap; /* handle for previous bitmap */
696 BITMAP bm; /* bitmap properties */
697 unsigned int size; /* size of bitmap */
698 char *bmbits; /* contents of bitmap */
699 int w; /* screen width */
700 int h; /* screen height */
701 int y; /* y-coordinate of screen lines to grab */
702 int n = 16; /* number of screen lines to grab at a time */
703
704 if (GetVersion() >= 0x80000000 || !OPENSSL_isservice())
705 return;
706
707 /* Create a screen DC and a memory DC compatible to screen DC */
708 hScrDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);
709 hMemDC = CreateCompatibleDC(hScrDC);
710
711 /* Get screen resolution */
712 w = GetDeviceCaps(hScrDC, HORZRES);
713 h = GetDeviceCaps(hScrDC, VERTRES);
714
715 /* Create a bitmap compatible with the screen DC */
716 hBitmap = CreateCompatibleBitmap(hScrDC, w, n);
717
718 /* Select new bitmap into memory DC */
719 hOldBitmap = SelectObject(hMemDC, hBitmap);
720
721 /* Get bitmap properties */
722 GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
723 size = (unsigned int)bm.bmWidthBytes * bm.bmHeight * bm.bmPlanes;
724
725 bmbits = OPENSSL_malloc(size);
726 if (bmbits) {
727 /* Now go through the whole screen, repeatedly grabbing n lines */
728 for (y = 0; y < h-n; y += n)
729 {
730 unsigned char md[MD_DIGEST_LENGTH];
731
732 /* Bitblt screen DC to memory DC */
733 BitBlt(hMemDC, 0, 0, w, n, hScrDC, 0, y, SRCCOPY);
734
735 /* Copy bitmap bits from memory DC to bmbits */
736 GetBitmapBits(hBitmap, size, bmbits);
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 /* Select old bitmap back into memory DC */
749 hBitmap = SelectObject(hMemDC, hOldBitmap);
750
751 /* Clean up */
752 DeleteObject(hBitmap);
753 DeleteDC(hMemDC);
754 DeleteDC(hScrDC);
755 #endif /* !OPENSSL_SYS_WINCE */
756 }
757
758 #endif
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