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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/* Intel hardware RNG CSP -- available from
125 * http://developer.intel.com/design/security/rng/redist_license.htm
126 */
127#define PROV_INTEL_SEC 22
128#define INTEL_DEF_PROV TEXT("Intel Hardware Cryptographic Service Provider")
129
130static void readtimer(void);
131static void readscreen(void);
132
133/* It appears like CURSORINFO, PCURSORINFO and LPCURSORINFO are only defined
134 when WINVER is 0x0500 and up, which currently only happens on Win2000.
135 Unfortunately, those are typedefs, so they're a little bit difficult to
136 detect properly. On the other hand, the macro CURSOR_SHOWING is defined
137 within the same conditional, so it can be use to detect the absence of said
138 typedefs. */
139
140#ifndef CURSOR_SHOWING
141/*
142 * Information about the global cursor.
143 */
144typedef struct tagCURSORINFO
145{
146 DWORD cbSize;
147 DWORD flags;
148 HCURSOR hCursor;
149 POINT ptScreenPos;
150} CURSORINFO, *PCURSORINFO, *LPCURSORINFO;
151
152#define CURSOR_SHOWING 0x00000001
153#endif /* CURSOR_SHOWING */
154
155typedef BOOL (WINAPI *CRYPTACQUIRECONTEXT)(HCRYPTPROV *, LPCTSTR, LPCTSTR,
156 DWORD, DWORD);
157typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV, DWORD, BYTE *);
158typedef BOOL (WINAPI *CRYPTRELEASECONTEXT)(HCRYPTPROV, DWORD);
159
160typedef HWND (WINAPI *GETFOREGROUNDWINDOW)(VOID);
161typedef BOOL (WINAPI *GETCURSORINFO)(PCURSORINFO);
162typedef DWORD (WINAPI *GETQUEUESTATUS)(UINT);
163
164typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
165typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
166typedef BOOL (WINAPI *HEAP32FIRST)(LPHEAPENTRY32, DWORD, DWORD);
167typedef BOOL (WINAPI *HEAP32NEXT)(LPHEAPENTRY32);
168typedef BOOL (WINAPI *HEAP32LIST)(HANDLE, LPHEAPLIST32);
169typedef BOOL (WINAPI *PROCESS32)(HANDLE, LPPROCESSENTRY32);
170typedef BOOL (WINAPI *THREAD32)(HANDLE, LPTHREADENTRY32);
171typedef BOOL (WINAPI *MODULE32)(HANDLE, LPMODULEENTRY32);
172
173#include <lmcons.h>
174#ifndef OPENSSL_SYS_WINCE
175#include <lmstats.h>
176#endif
177#if 1 /* The NET API is Unicode only. It requires the use of the UNICODE
178 * macro. When UNICODE is defined LPTSTR becomes LPWSTR. LMSTR was
179 * was added to the Platform SDK to allow the NET API to be used in
180 * non-Unicode applications provided that Unicode strings were still
181 * used for input. LMSTR is defined as LPWSTR.
182 */
183typedef NET_API_STATUS (NET_API_FUNCTION * NETSTATGET)
184 (LPWSTR, LPWSTR, DWORD, DWORD, LPBYTE*);
185typedef NET_API_STATUS (NET_API_FUNCTION * NETFREE)(LPBYTE);
186#endif /* 1 */
187
188int RAND_poll(void)
189{
190 MEMORYSTATUS m;
191 HCRYPTPROV hProvider = 0;
192 BYTE buf[64];
193 DWORD w;
194 HWND h;
195
196 HMODULE advapi, kernel, user, netapi;
197 CRYPTACQUIRECONTEXT acquire = 0;
198 CRYPTGENRANDOM gen = 0;
199 CRYPTRELEASECONTEXT release = 0;
200#if 1 /* There was previously a problem with NETSTATGET. Currently, this
201 * section is still experimental, but if all goes well, this conditional
202 * will be removed
203 */
204 NETSTATGET netstatget = 0;
205 NETFREE netfree = 0;
206#endif /* 1 */
207
208 /* Determine the OS version we are on so we can turn off things
209 * that do not work properly.
210 */
211 OSVERSIONINFO osverinfo ;
212 osverinfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO) ;
213 GetVersionEx( &osverinfo ) ;
214
215#if defined(OPENSSL_SYS_WINCE) && WCEPLATFORM!=MS_HPC_PRO
216 /* poll the CryptoAPI PRNG */
217 /* The CryptoAPI returns sizeof(buf) bytes of randomness */
218 if (CryptAcquireContext(&hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
219 {
220 if (CryptGenRandom(hProvider, sizeof(buf), buf))
221 RAND_add(buf, sizeof(buf), sizeof(buf));
222 CryptReleaseContext(hProvider, 0);
223 }
224#endif
225
226 /* load functions dynamically - not available on all systems */
227 advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
228 kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
229 user = LoadLibrary(TEXT("USER32.DLL"));
230 netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
231
232#ifndef OPENSSL_SYS_WINCE
233#if 1 /* There was previously a problem with NETSTATGET. Currently, this
234 * section is still experimental, but if all goes well, this conditional
235 * will be removed
236 */
237 if (netapi)
238 {
239 netstatget = (NETSTATGET) GetProcAddress(netapi,TEXT("NetStatisticsGet"));
240 netfree = (NETFREE) GetProcAddress(netapi,TEXT("NetApiBufferFree"));
241 }
242
243 if (netstatget && netfree)
244 {
245 LPBYTE outbuf;
246 /* NetStatisticsGet() is a Unicode only function
247 * STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0
248 * contains 17 fields. We treat each field as a source of
249 * one byte of entropy.
250 */
251
252 if (netstatget(NULL, L"LanmanWorkstation", 0, 0, &outbuf) == 0)
253 {
254 RAND_add(outbuf, sizeof(STAT_WORKSTATION_0), 45);
255 netfree(outbuf);
256 }
257 if (netstatget(NULL, L"LanmanServer", 0, 0, &outbuf) == 0)
258 {
259 RAND_add(outbuf, sizeof(STAT_SERVER_0), 17);
260 netfree(outbuf);
261 }
262 }
263
264 if (netapi)
265 FreeLibrary(netapi);
266#endif /* 1 */
267#endif /* !OPENSSL_SYS_WINCE */
268
269#ifndef OPENSSL_SYS_WINCE
270 /* It appears like this can cause an exception deep within ADVAPI32.DLL
271 * at random times on Windows 2000. Reported by Jeffrey Altman.
272 * Only use it on NT.
273 */
274 /* Wolfgang Marczy <WMarczy@topcall.co.at> reports that
275 * the RegQueryValueEx call below can hang on NT4.0 (SP6).
276 * So we don't use this at all for now. */
277#if 0
278 if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT &&
279 osverinfo.dwMajorVersion < 5)
280 {
281 /* Read Performance Statistics from NT/2000 registry
282 * The size of the performance data can vary from call
283 * to call so we must guess the size of the buffer to use
284 * and increase its size if we get an ERROR_MORE_DATA
285 * return instead of ERROR_SUCCESS.
286 */
287 LONG rc=ERROR_MORE_DATA;
288 char * buf=NULL;
289 DWORD bufsz=0;
290 DWORD length;
291
292 while (rc == ERROR_MORE_DATA)
293 {
294 buf = realloc(buf,bufsz+8192);
295 if (!buf)
296 break;
297 bufsz += 8192;
298
299 length = bufsz;
300 rc = RegQueryValueEx(HKEY_PERFORMANCE_DATA, TEXT("Global"),
301 NULL, NULL, buf, &length);
302 }
303 if (rc == ERROR_SUCCESS)
304 {
305 /* For entropy count assume only least significant
306 * byte of each DWORD is random.
307 */
308 RAND_add(&length, sizeof(length), 0);
309 RAND_add(buf, length, length / 4.0);
310
311 /* Close the Registry Key to allow Windows to cleanup/close
312 * the open handle
313 * Note: The 'HKEY_PERFORMANCE_DATA' key is implicitly opened
314 * when the RegQueryValueEx above is done. However, if
315 * it is not explicitly closed, it can cause disk
316 * partition manipulation problems.
317 */
318 RegCloseKey(HKEY_PERFORMANCE_DATA);
319 }
320 if (buf)
321 free(buf);
322 }
323#endif
324#endif /* !OPENSSL_SYS_WINCE */
325
326 if (advapi)
327 {
328 acquire = (CRYPTACQUIRECONTEXT) GetProcAddress(advapi,
329 TEXT("CryptAcquireContextA"));
330 gen = (CRYPTGENRANDOM) GetProcAddress(advapi,
331 TEXT("CryptGenRandom"));
332 release = (CRYPTRELEASECONTEXT) GetProcAddress(advapi,
333 TEXT("CryptReleaseContext"));
334 }
335
336 if (acquire && gen && release)
337 {
338 /* poll the CryptoAPI PRNG */
339 /* The CryptoAPI returns sizeof(buf) bytes of randomness */
340 if (acquire(&hProvider, 0, 0, PROV_RSA_FULL,
341 CRYPT_VERIFYCONTEXT))
342 {
343 if (gen(hProvider, sizeof(buf), buf) != 0)
344 {
345 RAND_add(buf, sizeof(buf), 0);
346#if 0
347 printf("randomness from PROV_RSA_FULL\n");
348#endif
349 }
350 release(hProvider, 0);
351 }
352
353 /* poll the Pentium PRG with CryptoAPI */
354 if (acquire(&hProvider, 0, INTEL_DEF_PROV, PROV_INTEL_SEC, 0))
355 {
356 if (gen(hProvider, sizeof(buf), buf) != 0)
357 {
358 RAND_add(buf, sizeof(buf), sizeof(buf));
359#if 0
360 printf("randomness from PROV_INTEL_SEC\n");
361#endif
362 }
363 release(hProvider, 0);
364 }
365 }
366
367 if (advapi)
368 FreeLibrary(advapi);
369
370 /* timer data */
371 readtimer();
372
373 /* memory usage statistics */
374 GlobalMemoryStatus(&m);
375 RAND_add(&m, sizeof(m), 1);
376
377 /* process ID */
378 w = GetCurrentProcessId();
379 RAND_add(&w, sizeof(w), 1);
380
381 if (user)
382 {
383 GETCURSORINFO cursor;
384 GETFOREGROUNDWINDOW win;
385 GETQUEUESTATUS queue;
386
387 win = (GETFOREGROUNDWINDOW) GetProcAddress(user, TEXT("GetForegroundWindow"));
388 cursor = (GETCURSORINFO) GetProcAddress(user, TEXT("GetCursorInfo"));
389 queue = (GETQUEUESTATUS) GetProcAddress(user, TEXT("GetQueueStatus"));
390
391 if (win)
392 {
393 /* window handle */
394 h = win();
395 RAND_add(&h, sizeof(h), 0);
396 }
397 if (cursor)
398 {
399 /* unfortunately, its not safe to call GetCursorInfo()
400 * on NT4 even though it exists in SP3 (or SP6) and
401 * higher.
402 */
403 if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT &&
404 osverinfo.dwMajorVersion < 5)
405 cursor = 0;
406 }
407 if (cursor)
408 {
409 /* cursor position */
410 /* assume 2 bytes of entropy */
411 CURSORINFO ci;
412 ci.cbSize = sizeof(CURSORINFO);
413 if (cursor(&ci))
414 RAND_add(&ci, ci.cbSize, 2);
415 }
416
417 if (queue)
418 {
419 /* message queue status */
420 /* assume 1 byte of entropy */
421 w = queue(QS_ALLEVENTS);
422 RAND_add(&w, sizeof(w), 1);
423 }
424
425 FreeLibrary(user);
426 }
427
428 /* Toolhelp32 snapshot: enumerate processes, threads, modules and heap
429 * http://msdn.microsoft.com/library/psdk/winbase/toolhelp_5pfd.htm
430 * (Win 9x and 2000 only, not available on NT)
431 *
432 * This seeding method was proposed in Peter Gutmann, Software
433 * Generation of Practically Strong Random Numbers,
434 * http://www.usenix.org/publications/library/proceedings/sec98/gutmann.html
435 * revised version at http://www.cryptoengines.com/~peter/06_random.pdf
436 * (The assignment of entropy estimates below is arbitrary, but based
437 * on Peter's analysis the full poll appears to be safe. Additional
438 * interactive seeding is encouraged.)
439 */
440
441 if (kernel)
442 {
443 CREATETOOLHELP32SNAPSHOT snap;
444 CLOSETOOLHELP32SNAPSHOT close_snap;
445 HANDLE handle;
446
447 HEAP32FIRST heap_first;
448 HEAP32NEXT heap_next;
449 HEAP32LIST heaplist_first, heaplist_next;
450 PROCESS32 process_first, process_next;
451 THREAD32 thread_first, thread_next;
452 MODULE32 module_first, module_next;
453
454 HEAPLIST32 hlist;
455 HEAPENTRY32 hentry;
456 PROCESSENTRY32 p;
457 THREADENTRY32 t;
458 MODULEENTRY32 m;
459
460 snap = (CREATETOOLHELP32SNAPSHOT)
461 GetProcAddress(kernel, TEXT("CreateToolhelp32Snapshot"));
462 close_snap = (CLOSETOOLHELP32SNAPSHOT)
463 GetProcAddress(kernel, TEXT("CloseToolhelp32Snapshot"));
464 heap_first = (HEAP32FIRST) GetProcAddress(kernel, TEXT("Heap32First"));
465 heap_next = (HEAP32NEXT) GetProcAddress(kernel, TEXT("Heap32Next"));
466 heaplist_first = (HEAP32LIST) GetProcAddress(kernel, TEXT("Heap32ListFirst"));
467 heaplist_next = (HEAP32LIST) GetProcAddress(kernel, TEXT("Heap32ListNext"));
468 process_first = (PROCESS32) GetProcAddress(kernel, TEXT("Process32First"));
469 process_next = (PROCESS32) GetProcAddress(kernel, TEXT("Process32Next"));
470 thread_first = (THREAD32) GetProcAddress(kernel, TEXT("Thread32First"));
471 thread_next = (THREAD32) GetProcAddress(kernel, TEXT("Thread32Next"));
472 module_first = (MODULE32) GetProcAddress(kernel, TEXT("Module32First"));
473 module_next = (MODULE32) GetProcAddress(kernel, TEXT("Module32Next"));
474
475 if (snap && heap_first && heap_next && heaplist_first &&
476 heaplist_next && process_first && process_next &&
477 thread_first && thread_next && module_first &&
478 module_next && (handle = snap(TH32CS_SNAPALL,0))
479 != INVALID_HANDLE_VALUE)
480 {
481 /* heap list and heap walking */
482 /* HEAPLIST32 contains 3 fields that will change with
483 * each entry. Consider each field a source of 1 byte
484 * of entropy.
485 * HEAPENTRY32 contains 5 fields that will change with
486 * each entry. Consider each field a source of 1 byte
487 * of entropy.
488 */
489 hlist.dwSize = sizeof(HEAPLIST32);
490 if (heaplist_first(handle, &hlist))
491 do
492 {
493 RAND_add(&hlist, hlist.dwSize, 3);
494 hentry.dwSize = sizeof(HEAPENTRY32);
495 if (heap_first(&hentry,
496 hlist.th32ProcessID,
497 hlist.th32HeapID))
498 {
499 int entrycnt = 80;
500 do
501 RAND_add(&hentry,
502 hentry.dwSize, 5);
503 while (heap_next(&hentry)
504 && --entrycnt > 0);
505 }
506 } while (heaplist_next(handle,
507 &hlist));
508
509 /* process walking */
510 /* PROCESSENTRY32 contains 9 fields that will change
511 * with each entry. Consider each field a source of
512 * 1 byte of entropy.
513 */
514 p.dwSize = sizeof(PROCESSENTRY32);
515 if (process_first(handle, &p))
516 do
517 RAND_add(&p, p.dwSize, 9);
518 while (process_next(handle, &p));
519
520 /* thread walking */
521 /* THREADENTRY32 contains 6 fields that will change
522 * with each entry. Consider each field a source of
523 * 1 byte of entropy.
524 */
525 t.dwSize = sizeof(THREADENTRY32);
526 if (thread_first(handle, &t))
527 do
528 RAND_add(&t, t.dwSize, 6);
529 while (thread_next(handle, &t));
530
531 /* module walking */
532 /* MODULEENTRY32 contains 9 fields that will change
533 * with each entry. Consider each field a source of
534 * 1 byte of entropy.
535 */
536 m.dwSize = sizeof(MODULEENTRY32);
537 if (module_first(handle, &m))
538 do
539 RAND_add(&m, m.dwSize, 9);
540 while (module_next(handle, &m));
541 if (close_snap)
542 close_snap(handle);
543 else
544 CloseHandle(handle);
545 }
546
547 FreeLibrary(kernel);
548 }
549
550#if 0
551 printf("Exiting RAND_poll\n");
552#endif
553
554 return(1);
555}
556
557int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
558 {
559 double add_entropy=0;
560
561 switch (iMsg)
562 {
563 case WM_KEYDOWN:
564 {
565 static WPARAM key;
566 if (key != wParam)
567 add_entropy = 0.05;
568 key = wParam;
569 }
570 break;
571 case WM_MOUSEMOVE:
572 {
573 static int lastx,lasty,lastdx,lastdy;
574 int x,y,dx,dy;
575
576 x=LOWORD(lParam);
577 y=HIWORD(lParam);
578 dx=lastx-x;
579 dy=lasty-y;
580 if (dx != 0 && dy != 0 && dx-lastdx != 0 && dy-lastdy != 0)
581 add_entropy=.2;
582 lastx=x, lasty=y;
583 lastdx=dx, lastdy=dy;
584 }
585 break;
586 }
587
588 readtimer();
589 RAND_add(&iMsg, sizeof(iMsg), add_entropy);
590 RAND_add(&wParam, sizeof(wParam), 0);
591 RAND_add(&lParam, sizeof(lParam), 0);
592
593 return (RAND_status());
594 }
595
596
597void RAND_screen(void) /* function available for backward compatibility */
598{
599 RAND_poll();
600 readscreen();
601}
602
603
604/* feed timing information to the PRNG */
605static void readtimer(void)
606{
607 DWORD w;
608 LARGE_INTEGER l;
609 static int have_perfc = 1;
610#if defined(_MSC_VER) && !defined(OPENSSL_SYS_WINCE)
611 static int have_tsc = 1;
612 DWORD cyclecount;
613
614 if (have_tsc) {
615 __try {
616 __asm {
617 _emit 0x0f
618 _emit 0x31
619 mov cyclecount, eax
620 }
621 RAND_add(&cyclecount, sizeof(cyclecount), 1);
622 } __except(EXCEPTION_EXECUTE_HANDLER) {
623 have_tsc = 0;
624 }
625 }
626#else
627# define have_tsc 0
628#endif
629
630 if (have_perfc) {
631 if (QueryPerformanceCounter(&l) == 0)
632 have_perfc = 0;
633 else
634 RAND_add(&l, sizeof(l), 0);
635 }
636
637 if (!have_tsc && !have_perfc) {
638 w = GetTickCount();
639 RAND_add(&w, sizeof(w), 0);
640 }
641}
642
643/* feed screen contents to PRNG */
644/*****************************************************************************
645 *
646 * Created 960901 by Gertjan van Oosten, gertjan@West.NL, West Consulting B.V.
647 *
648 * Code adapted from
649 * <URL:http://support.microsoft.com/default.aspx?scid=kb;[LN];97193>;
650 * the original copyright message is:
651 *
652 * (C) Copyright Microsoft Corp. 1993. All rights reserved.
653 *
654 * You have a royalty-free right to use, modify, reproduce and
655 * distribute the Sample Files (and/or any modified version) in
656 * any way you find useful, provided that you agree that
657 * Microsoft has no warranty obligations or liability for any
658 * Sample Application Files which are modified.
659 */
660
661static void readscreen(void)
662{
663#ifndef OPENSSL_SYS_WINCE
664 HDC hScrDC; /* screen DC */
665 HDC hMemDC; /* memory DC */
666 HBITMAP hBitmap; /* handle for our bitmap */
667 HBITMAP hOldBitmap; /* handle for previous bitmap */
668 BITMAP bm; /* bitmap properties */
669 unsigned int size; /* size of bitmap */
670 char *bmbits; /* contents of bitmap */
671 int w; /* screen width */
672 int h; /* screen height */
673 int y; /* y-coordinate of screen lines to grab */
674 int n = 16; /* number of screen lines to grab at a time */
675
676 /* Create a screen DC and a memory DC compatible to screen DC */
677 hScrDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);
678 hMemDC = CreateCompatibleDC(hScrDC);
679
680 /* Get screen resolution */
681 w = GetDeviceCaps(hScrDC, HORZRES);
682 h = GetDeviceCaps(hScrDC, VERTRES);
683
684 /* Create a bitmap compatible with the screen DC */
685 hBitmap = CreateCompatibleBitmap(hScrDC, w, n);
686
687 /* Select new bitmap into memory DC */
688 hOldBitmap = SelectObject(hMemDC, hBitmap);
689
690 /* Get bitmap properties */
691 GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
692 size = (unsigned int)bm.bmWidthBytes * bm.bmHeight * bm.bmPlanes;
693
694 bmbits = OPENSSL_malloc(size);
695 if (bmbits) {
696 /* Now go through the whole screen, repeatedly grabbing n lines */
697 for (y = 0; y < h-n; y += n)
698 {
699 unsigned char md[MD_DIGEST_LENGTH];
700
701 /* Bitblt screen DC to memory DC */
702 BitBlt(hMemDC, 0, 0, w, n, hScrDC, 0, y, SRCCOPY);
703
704 /* Copy bitmap bits from memory DC to bmbits */
705 GetBitmapBits(hBitmap, size, bmbits);
706
707 /* Get the hash of the bitmap */
708 MD(bmbits,size,md);
709
710 /* Seed the random generator with the hash value */
711 RAND_add(md, MD_DIGEST_LENGTH, 0);
712 }
713
714 OPENSSL_free(bmbits);
715 }
716
717 /* Select old bitmap back into memory DC */
718 hBitmap = SelectObject(hMemDC, hOldBitmap);
719
720 /* Clean up */
721 DeleteObject(hBitmap);
722 DeleteDC(hMemDC);
723 DeleteDC(hScrDC);
724#endif /* !OPENSSL_SYS_WINCE */
725}
726
727#endif
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-04-26 20:20:07 +0000