1 /* crypto/rand/rand_win.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
58 /* ====================================================================
59 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
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).
114 #include "cryptlib.h"
115 #include <openssl/rand.h>
116 #include "rand_lcl.h"
118 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
121 # define _WIN32_WINNT 0x0400
123 #include <wincrypt.h>
124 #include <tlhelp32.h>
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
130 /* Intel hardware RNG CSP -- available from
131 * http://developer.intel.com/design/security/rng/redist_license.htm
133 #define PROV_INTEL_SEC 22
134 #define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
136 static void readtimer(void);
137 static void readscreen(void);
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
146 #ifndef CURSOR_SHOWING
148 * Information about the global cursor.
150 typedef struct tagCURSORINFO
156 } CURSORINFO, *PCURSORINFO, *LPCURSORINFO;
158 #define CURSOR_SHOWING 0x00000001
159 #endif /* CURSOR_SHOWING */
161 #if !defined(OPENSSL_SYS_WINCE)
162 typedef BOOL (WINAPI *CRYPTACQUIRECONTEXTW)(HCRYPTPROV *, LPCWSTR, LPCWSTR,
164 typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV, DWORD, BYTE *);
165 typedef BOOL (WINAPI *CRYPTRELEASECONTEXT)(HCRYPTPROV, DWORD);
167 typedef HWND (WINAPI *GETFOREGROUNDWINDOW)(VOID);
168 typedef BOOL (WINAPI *GETCURSORINFO)(PCURSORINFO);
169 typedef DWORD (WINAPI *GETQUEUESTATUS)(UINT);
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);
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.
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);
192 #endif /* !OPENSSL_SYS_WINCE */
197 HCRYPTPROV hProvider = 0;
201 /* Determine the OS version we are on so we can turn off things
202 * that do not work properly.
204 OSVERSIONINFO osverinfo ;
205 osverinfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO) ;
206 GetVersionEx( &osverinfo ) ;
208 #if defined(OPENSSL_SYS_WINCE)
209 # if defined(_WIN32_WCE) && _WIN32_WCE>=300
210 /* Even though MSDN says _WIN32_WCE>=210, it doesn't seem to be available
211 * in commonly available implementations prior 300... */
214 /* poll the CryptoAPI PRNG */
215 /* The CryptoAPI returns sizeof(buf) bytes of randomness */
216 if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL,
217 CRYPT_VERIFYCONTEXT))
219 if (CryptGenRandom(hProvider, sizeof(buf), buf))
220 RAND_add(buf, sizeof(buf), sizeof(buf));
221 CryptReleaseContext(hProvider, 0);
225 #else /* OPENSSL_SYS_WINCE */
227 * None of below libraries are present on Windows CE, which is
228 * why we #ifndef the whole section. This also excuses us from
229 * handling the GetProcAddress issue. The trouble is that in
230 * real Win32 API GetProcAddress is available in ANSI flavor
231 * only. In WinCE on the other hand GetProcAddress is a macro
232 * most commonly defined as GetProcAddressW, which accepts
233 * Unicode argument. If we were to call GetProcAddress under
234 * WinCE, I'd recommend to either redefine GetProcAddress as
235 * GetProcAddressA (there seem to be one in common CE spec) or
236 * implement own shim routine, which would accept ANSI argument
237 * and expand it to Unicode.
240 /* load functions dynamically - not available on all systems */
241 HMODULE advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
242 HMODULE kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
244 HMODULE netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
245 CRYPTACQUIRECONTEXTW acquire = NULL;
246 CRYPTGENRANDOM gen = NULL;
247 CRYPTRELEASECONTEXT release = NULL;
248 NETSTATGET netstatget = NULL;
249 NETFREE netfree = NULL;
254 netstatget = (NETSTATGET) GetProcAddress(netapi,"NetStatisticsGet");
255 netfree = (NETFREE) GetProcAddress(netapi,"NetApiBufferFree");
258 if (netstatget && netfree)
261 /* NetStatisticsGet() is a Unicode only function
262 * STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0
263 * contains 17 fields. We treat each field as a source of
264 * one byte of entropy.
267 if (netstatget(NULL, L"LanmanWorkstation", 0, 0, &outbuf) == 0)
269 RAND_add(outbuf, sizeof(STAT_WORKSTATION_0), 45);
272 if (netstatget(NULL, L"LanmanServer", 0, 0, &outbuf) == 0)
274 RAND_add(outbuf, sizeof(STAT_SERVER_0), 17);
282 /* It appears like this can cause an exception deep within ADVAPI32.DLL
283 * at random times on Windows 2000. Reported by Jeffrey Altman.
286 /* Wolfgang Marczy <WMarczy@topcall.co.at> reports that
287 * the RegQueryValueEx call below can hang on NT4.0 (SP6).
288 * So we don't use this at all for now. */
290 if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT &&
291 osverinfo.dwMajorVersion < 5)
293 /* Read Performance Statistics from NT/2000 registry
294 * The size of the performance data can vary from call
295 * to call so we must guess the size of the buffer to use
296 * and increase its size if we get an ERROR_MORE_DATA
297 * return instead of ERROR_SUCCESS.
299 LONG rc=ERROR_MORE_DATA;
304 while (rc == ERROR_MORE_DATA)
306 buf = realloc(buf,bufsz+8192);
312 rc = RegQueryValueEx(HKEY_PERFORMANCE_DATA, TEXT("Global"),
313 NULL, NULL, buf, &length);
315 if (rc == ERROR_SUCCESS)
317 /* For entropy count assume only least significant
318 * byte of each DWORD is random.
320 RAND_add(&length, sizeof(length), 0);
321 RAND_add(buf, length, length / 4.0);
323 /* Close the Registry Key to allow Windows to cleanup/close
325 * Note: The 'HKEY_PERFORMANCE_DATA' key is implicitly opened
326 * when the RegQueryValueEx above is done. However, if
327 * it is not explicitly closed, it can cause disk
328 * partition manipulation problems.
330 RegCloseKey(HKEY_PERFORMANCE_DATA);
340 * If it's available, then it's available in both ANSI
341 * and UNICODE flavors even in Win9x, documentation says.
342 * We favor Unicode...
344 acquire = (CRYPTACQUIRECONTEXTW) GetProcAddress(advapi,
345 "CryptAcquireContextW");
346 gen = (CRYPTGENRANDOM) GetProcAddress(advapi,
348 release = (CRYPTRELEASECONTEXT) GetProcAddress(advapi,
349 "CryptReleaseContext");
352 if (acquire && gen && release)
354 /* poll the CryptoAPI PRNG */
355 /* The CryptoAPI returns sizeof(buf) bytes of randomness */
356 if (acquire(&hProvider, NULL, NULL, PROV_RSA_FULL,
357 CRYPT_VERIFYCONTEXT))
359 if (gen(hProvider, sizeof(buf), buf) != 0)
361 RAND_add(buf, sizeof(buf), 0);
364 printf("randomness from PROV_RSA_FULL\n");
367 release(hProvider, 0);
370 /* poll the Pentium PRG with CryptoAPI */
371 if (acquire(&hProvider, 0, INTEL_DEF_PROV, PROV_INTEL_SEC, 0))
373 if (gen(hProvider, sizeof(buf), buf) != 0)
375 RAND_add(buf, sizeof(buf), sizeof(buf));
378 printf("randomness from PROV_INTEL_SEC\n");
381 release(hProvider, 0);
388 if ((osverinfo.dwPlatformId != VER_PLATFORM_WIN32_NT ||
389 !OPENSSL_isservice()) &&
390 (user = LoadLibrary(TEXT("USER32.DLL"))))
392 GETCURSORINFO cursor;
393 GETFOREGROUNDWINDOW win;
394 GETQUEUESTATUS queue;
396 win = (GETFOREGROUNDWINDOW) GetProcAddress(user, "GetForegroundWindow");
397 cursor = (GETCURSORINFO) GetProcAddress(user, "GetCursorInfo");
398 queue = (GETQUEUESTATUS) GetProcAddress(user, "GetQueueStatus");
404 RAND_add(&h, sizeof(h), 0);
408 /* unfortunately, its not safe to call GetCursorInfo()
409 * on NT4 even though it exists in SP3 (or SP6) and
412 if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT &&
413 osverinfo.dwMajorVersion < 5)
418 /* cursor position */
419 /* assume 2 bytes of entropy */
421 ci.cbSize = sizeof(CURSORINFO);
423 RAND_add(&ci, ci.cbSize, 2);
428 /* message queue status */
429 /* assume 1 byte of entropy */
430 w = queue(QS_ALLEVENTS);
431 RAND_add(&w, sizeof(w), 1);
438 * Toolhelp32 snapshot: enumerate processes, threads, modules and heap
439 * http://msdn.microsoft.com/library/psdk/winbase/toolhelp_5pfd.htm
440 * (Win 9x and 2000 only, not available on NT)
442 * This seeding method was proposed in Peter Gutmann, Software
443 * Generation of Practically Strong Random Numbers,
444 * http://www.usenix.org/publications/library/proceedings/sec98/gutmann.html
445 * revised version at http://www.cryptoengines.com/~peter/06_random.pdf
446 * (The assignment of entropy estimates below is arbitrary, but based
447 * on Peter's analysis the full poll appears to be safe. Additional
448 * interactive seeding is encouraged.)
453 CREATETOOLHELP32SNAPSHOT snap;
454 CLOSETOOLHELP32SNAPSHOT close_snap;
457 HEAP32FIRST heap_first;
458 HEAP32NEXT heap_next;
459 HEAP32LIST heaplist_first, heaplist_next;
460 PROCESS32 process_first, process_next;
461 THREAD32 thread_first, thread_next;
462 MODULE32 module_first, module_next;
471 snap = (CREATETOOLHELP32SNAPSHOT)
472 GetProcAddress(kernel, "CreateToolhelp32Snapshot");
473 close_snap = (CLOSETOOLHELP32SNAPSHOT)
474 GetProcAddress(kernel, "CloseToolhelp32Snapshot");
475 heap_first = (HEAP32FIRST) GetProcAddress(kernel, "Heap32First");
476 heap_next = (HEAP32NEXT) GetProcAddress(kernel, "Heap32Next");
477 heaplist_first = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListFirst");
478 heaplist_next = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListNext");
479 process_first = (PROCESS32) GetProcAddress(kernel, "Process32First");
480 process_next = (PROCESS32) GetProcAddress(kernel, "Process32Next");
481 thread_first = (THREAD32) GetProcAddress(kernel, "Thread32First");
482 thread_next = (THREAD32) GetProcAddress(kernel, "Thread32Next");
483 module_first = (MODULE32) GetProcAddress(kernel, "Module32First");
484 module_next = (MODULE32) GetProcAddress(kernel, "Module32Next");
486 if (snap && heap_first && heap_next && heaplist_first &&
487 heaplist_next && process_first && process_next &&
488 thread_first && thread_next && module_first &&
489 module_next && (handle = snap(TH32CS_SNAPALL,0))
490 != INVALID_HANDLE_VALUE)
492 /* heap list and heap walking */
493 /* HEAPLIST32 contains 3 fields that will change with
494 * each entry. Consider each field a source of 1 byte
496 * HEAPENTRY32 contains 5 fields that will change with
497 * each entry. Consider each field a source of 1 byte
500 ZeroMemory(&hlist, sizeof(HEAPLIST32));
501 hlist.dwSize = sizeof(HEAPLIST32);
502 if (good) starttime = GetTickCount();
504 if (heaplist_first(handle, &hlist))
507 following discussion on dev ML, exception on WinCE (or other Win
508 platform) is theoretically of unknown origin; prevent infinite
509 loop here when this theoretical case occurs; otherwise cope with
510 the expected (MSDN documented) exception-throwing behaviour of
511 Heap32Next() on WinCE.
513 based on patch in original message by Tanguy Fautré (2009/03/02)
514 Subject: RAND_poll() and CreateToolhelp32Snapshot() stability
516 int ex_cnt_limit = 42;
519 RAND_add(&hlist, hlist.dwSize, 3);
522 ZeroMemory(&hentry, sizeof(HEAPENTRY32));
523 hentry.dwSize = sizeof(HEAPENTRY32);
524 if (heap_first(&hentry,
532 while (heap_next(&hentry)
533 && (!good || (GetTickCount()-starttime)<MAXDELAY)
537 __except (EXCEPTION_EXECUTE_HANDLER)
539 /* ignore access violations when walking the heap list */
542 } while (heaplist_next(handle, &hlist)
543 && (!good || (GetTickCount()-starttime)<MAXDELAY)
544 && ex_cnt_limit > 0);
548 if (heaplist_first(handle, &hlist))
552 RAND_add(&hlist, hlist.dwSize, 3);
553 hentry.dwSize = sizeof(HEAPENTRY32);
554 if (heap_first(&hentry,
562 while (heap_next(&hentry)
565 } while (heaplist_next(handle, &hlist)
566 && (!good || (GetTickCount()-starttime)<MAXDELAY));
570 /* process walking */
571 /* PROCESSENTRY32 contains 9 fields that will change
572 * with each entry. Consider each field a source of
575 p.dwSize = sizeof(PROCESSENTRY32);
577 if (good) starttime = GetTickCount();
578 if (process_first(handle, &p))
580 RAND_add(&p, p.dwSize, 9);
581 while (process_next(handle, &p) && (!good || (GetTickCount()-starttime)<MAXDELAY));
584 /* THREADENTRY32 contains 6 fields that will change
585 * with each entry. Consider each field a source of
588 t.dwSize = sizeof(THREADENTRY32);
589 if (good) starttime = GetTickCount();
590 if (thread_first(handle, &t))
592 RAND_add(&t, t.dwSize, 6);
593 while (thread_next(handle, &t) && (!good || (GetTickCount()-starttime)<MAXDELAY));
596 /* MODULEENTRY32 contains 9 fields that will change
597 * with each entry. Consider each field a source of
600 m.dwSize = sizeof(MODULEENTRY32);
601 if (good) starttime = GetTickCount();
602 if (module_first(handle, &m))
604 RAND_add(&m, m.dwSize, 9);
605 while (module_next(handle, &m)
606 && (!good || (GetTickCount()-starttime)<MAXDELAY));
617 #endif /* !OPENSSL_SYS_WINCE */
622 /* memory usage statistics */
623 GlobalMemoryStatus(&m);
624 RAND_add(&m, sizeof(m), 1);
627 w = GetCurrentProcessId();
628 RAND_add(&w, sizeof(w), 1);
631 printf("Exiting RAND_poll\n");
637 int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
639 double add_entropy=0;
653 static int lastx,lasty,lastdx,lastdy;
660 if (dx != 0 && dy != 0 && dx-lastdx != 0 && dy-lastdy != 0)
663 lastdx=dx, lastdy=dy;
669 RAND_add(&iMsg, sizeof(iMsg), add_entropy);
670 RAND_add(&wParam, sizeof(wParam), 0);
671 RAND_add(&lParam, sizeof(lParam), 0);
673 return (RAND_status());
677 void RAND_screen(void) /* function available for backward compatibility */
684 /* feed timing information to the PRNG */
685 static void readtimer(void)
689 static int have_perfc = 1;
690 #if defined(_MSC_VER) && defined(_M_X86)
691 static int have_tsc = 1;
701 RAND_add(&cyclecount, sizeof(cyclecount), 1);
702 } __except(EXCEPTION_EXECUTE_HANDLER) {
711 if (QueryPerformanceCounter(&l) == 0)
714 RAND_add(&l, sizeof(l), 0);
717 if (!have_tsc && !have_perfc) {
719 RAND_add(&w, sizeof(w), 0);
723 /* feed screen contents to PRNG */
724 /*****************************************************************************
726 * Created 960901 by Gertjan van Oosten, gertjan@West.NL, West Consulting B.V.
729 * <URL:http://support.microsoft.com/default.aspx?scid=kb;[LN];97193>;
730 * the original copyright message is:
732 * (C) Copyright Microsoft Corp. 1993. All rights reserved.
734 * You have a royalty-free right to use, modify, reproduce and
735 * distribute the Sample Files (and/or any modified version) in
736 * any way you find useful, provided that you agree that
737 * Microsoft has no warranty obligations or liability for any
738 * Sample Application Files which are modified.
741 static void readscreen(void)
743 #if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN)
744 HDC hScrDC; /* screen DC */
745 HBITMAP hBitmap; /* handle for our bitmap */
746 BITMAP bm; /* bitmap properties */
747 unsigned int size; /* size of bitmap */
748 char *bmbits; /* contents of bitmap */
749 int w; /* screen width */
750 int h; /* screen height */
751 int y; /* y-coordinate of screen lines to grab */
752 int n = 16; /* number of screen lines to grab at a time */
753 BITMAPINFOHEADER bi; /* info about the bitmap */
755 if (check_winnt() && OPENSSL_isservice()>0)
758 /* Get a reference to the screen DC */
759 hScrDC = GetDC(NULL);
761 /* Get screen resolution */
762 w = GetDeviceCaps(hScrDC, HORZRES);
763 h = GetDeviceCaps(hScrDC, VERTRES);
765 /* Create a bitmap compatible with the screen DC */
766 hBitmap = CreateCompatibleBitmap(hScrDC, w, n);
768 /* Get bitmap properties */
769 GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
770 size = (unsigned int)bm.bmWidthBytes * bm.bmHeight * bm.bmPlanes;
772 bi.biSize = sizeof(BITMAPINFOHEADER);
773 bi.biWidth = bm.bmWidth;
774 bi.biHeight = bm.bmHeight;
775 bi.biPlanes = bm.bmPlanes;
776 bi.biBitCount = bm.bmBitsPixel;
777 bi.biCompression = BI_RGB;
779 bi.biXPelsPerMeter = 0;
780 bi.biYPelsPerMeter = 0;
782 bi.biClrImportant = 0;
784 bmbits = OPENSSL_malloc(size);
786 /* Now go through the whole screen, repeatedly grabbing n lines */
787 for (y = 0; y < h-n; y += n)
789 unsigned char md[MD_DIGEST_LENGTH];
791 /* Copy the bits of the current line range into the buffer */
792 GetDIBits(hScrDC, hBitmap, y, n,
793 bmbits, (BITMAPINFO *)&bi, DIB_RGB_COLORS);
795 /* Get the hash of the bitmap */
798 /* Seed the random generator with the hash value */
799 RAND_add(md, MD_DIGEST_LENGTH, 0);
802 OPENSSL_free(bmbits);
806 DeleteObject(hBitmap);
807 ReleaseDC(NULL, hScrDC);
808 #endif /* !OPENSSL_SYS_WINCE */