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).
112 #include "internal/cryptlib.h"
113 #include <openssl/rand.h>
114 #include "rand_lcl.h"
116 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
117 # include <windows.h>
118 # ifndef _WIN32_WINNT
119 # define _WIN32_WINNT 0x0400
121 # include <wincrypt.h>
122 # include <tlhelp32.h>
125 * Limit the time spent walking through the heap, processes, threads and
126 * modules to a maximum of 1000 miliseconds each, unless CryptoGenRandom
129 # define MAXDELAY 1000
132 * Intel hardware RNG CSP -- available from
133 * http://developer.intel.com/design/security/rng/redist_license.htm
135 # define PROV_INTEL_SEC 22
136 # define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
138 static void readtimer(void);
139 static void readscreen(void);
142 * It appears like CURSORINFO, PCURSORINFO and LPCURSORINFO are only defined
143 * when WINVER is 0x0500 and up, which currently only happens on Win2000.
144 * Unfortunately, those are typedefs, so they're a little bit difficult to
145 * detect properly. On the other hand, the macro CURSOR_SHOWING is defined
146 * within the same conditional, so it can be use to detect the absence of
150 # ifndef CURSOR_SHOWING
152 * Information about the global cursor.
154 typedef struct tagCURSORINFO
{
159 } CURSORINFO
, *PCURSORINFO
, *LPCURSORINFO
;
161 # define CURSOR_SHOWING 0x00000001
162 # endif /* CURSOR_SHOWING */
164 # if !defined(OPENSSL_SYS_WINCE)
165 typedef BOOL(WINAPI
*CRYPTACQUIRECONTEXTW
) (HCRYPTPROV
*, LPCWSTR
, LPCWSTR
,
167 typedef BOOL(WINAPI
*CRYPTGENRANDOM
) (HCRYPTPROV
, DWORD
, BYTE
*);
168 typedef BOOL(WINAPI
*CRYPTRELEASECONTEXT
) (HCRYPTPROV
, DWORD
);
170 typedef HWND(WINAPI
*GETFOREGROUNDWINDOW
) (VOID
);
171 typedef BOOL(WINAPI
*GETCURSORINFO
) (PCURSORINFO
);
172 typedef DWORD(WINAPI
*GETQUEUESTATUS
) (UINT
);
174 typedef HANDLE(WINAPI
*CREATETOOLHELP32SNAPSHOT
) (DWORD
, DWORD
);
175 typedef BOOL(WINAPI
*CLOSETOOLHELP32SNAPSHOT
) (HANDLE
);
176 typedef BOOL(WINAPI
*HEAP32FIRST
) (LPHEAPENTRY32
, DWORD
, size_t);
177 typedef BOOL(WINAPI
*HEAP32NEXT
) (LPHEAPENTRY32
);
178 typedef BOOL(WINAPI
*HEAP32LIST
) (HANDLE
, LPHEAPLIST32
);
179 typedef BOOL(WINAPI
*PROCESS32
) (HANDLE
, LPPROCESSENTRY32
);
180 typedef BOOL(WINAPI
*THREAD32
) (HANDLE
, LPTHREADENTRY32
);
181 typedef BOOL(WINAPI
*MODULE32
) (HANDLE
, LPMODULEENTRY32
);
184 # include <lmstats.h>
186 * The NET API is Unicode only. It requires the use of the UNICODE macro.
187 * When UNICODE is defined LPTSTR becomes LPWSTR. LMSTR was was added to the
188 * Platform SDK to allow the NET API to be used in non-Unicode applications
189 * provided that Unicode strings were still used for input. LMSTR is defined
192 typedef NET_API_STATUS(NET_API_FUNCTION
*NETSTATGET
)
193 (LPWSTR
, LPWSTR
, DWORD
, DWORD
, LPBYTE
*);
194 typedef NET_API_STATUS(NET_API_FUNCTION
*NETFREE
) (LPBYTE
);
195 # endif /* !OPENSSL_SYS_WINCE */
200 HCRYPTPROV hProvider
= 0;
204 # if defined(OPENSSL_SYS_WINCE)
205 # if defined(_WIN32_WCE) && _WIN32_WCE>=300
207 * Even though MSDN says _WIN32_WCE>=210, it doesn't seem to be available
208 * in commonly available implementations prior 300...
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 if (CryptGenRandom(hProvider
, sizeof(buf
), buf
))
217 RAND_add(buf
, sizeof(buf
), sizeof(buf
));
218 CryptReleaseContext(hProvider
, 0);
222 # else /* OPENSSL_SYS_WINCE */
224 * None of below libraries are present on Windows CE, which is
225 * why we #ifndef the whole section. This also excuses us from
226 * handling the GetProcAddress issue. The trouble is that in
227 * real Win32 API GetProcAddress is available in ANSI flavor
228 * only. In WinCE on the other hand GetProcAddress is a macro
229 * most commonly defined as GetProcAddressW, which accepts
230 * Unicode argument. If we were to call GetProcAddress under
231 * WinCE, I'd recommend to either redefine GetProcAddress as
232 * GetProcAddressA (there seem to be one in common CE spec) or
233 * implement own shim routine, which would accept ANSI argument
234 * and expand it to Unicode.
237 /* load functions dynamically - not available on all systems */
238 HMODULE advapi
= LoadLibrary(TEXT("ADVAPI32.DLL"));
239 HMODULE kernel
= LoadLibrary(TEXT("KERNEL32.DLL"));
241 HMODULE netapi
= LoadLibrary(TEXT("NETAPI32.DLL"));
242 CRYPTACQUIRECONTEXTW acquire
= NULL
;
243 CRYPTGENRANDOM gen
= NULL
;
244 CRYPTRELEASECONTEXT release
= NULL
;
245 NETSTATGET netstatget
= NULL
;
246 NETFREE netfree
= NULL
;
251 (NETSTATGET
) GetProcAddress(netapi
, "NetStatisticsGet");
252 netfree
= (NETFREE
) GetProcAddress(netapi
, "NetApiBufferFree");
255 if (netstatget
&& netfree
) {
258 * NetStatisticsGet() is a Unicode only function
259 * STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0
260 * contains 17 fields. We treat each field as a source of one
264 if (netstatget(NULL
, L
"LanmanWorkstation", 0, 0, &outbuf
) == 0) {
265 RAND_add(outbuf
, sizeof(STAT_WORKSTATION_0
), 45);
268 if (netstatget(NULL
, L
"LanmanServer", 0, 0, &outbuf
) == 0) {
269 RAND_add(outbuf
, sizeof(STAT_SERVER_0
), 17);
278 * It appears like this can cause an exception deep within
279 * ADVAPI32.DLL at random times on Windows 2000. Reported by Jeffrey
280 * Altman. Only use it on NT.
285 * If it's available, then it's available in both ANSI
286 * and UNICODE flavors even in Win9x, documentation says.
287 * We favor Unicode...
289 acquire
= (CRYPTACQUIRECONTEXTW
) GetProcAddress(advapi
,
290 "CryptAcquireContextW");
291 gen
= (CRYPTGENRANDOM
) GetProcAddress(advapi
, "CryptGenRandom");
292 release
= (CRYPTRELEASECONTEXT
) GetProcAddress(advapi
,
293 "CryptReleaseContext");
296 if (acquire
&& gen
&& release
) {
297 /* poll the CryptoAPI PRNG */
298 /* The CryptoAPI returns sizeof(buf) bytes of randomness */
299 if (acquire(&hProvider
, NULL
, NULL
, PROV_RSA_FULL
,
300 CRYPT_VERIFYCONTEXT
)) {
301 if (gen(hProvider
, sizeof(buf
), buf
) != 0) {
302 RAND_add(buf
, sizeof(buf
), 0);
305 release(hProvider
, 0);
308 /* poll the Pentium PRG with CryptoAPI */
309 if (acquire(&hProvider
, 0, INTEL_DEF_PROV
, PROV_INTEL_SEC
, 0)) {
310 if (gen(hProvider
, sizeof(buf
), buf
) != 0) {
311 RAND_add(buf
, sizeof(buf
), sizeof(buf
));
314 release(hProvider
, 0);
321 if ((!check_winnt() ||
322 !OPENSSL_isservice()) &&
323 (user
= LoadLibrary(TEXT("USER32.DLL")))) {
324 GETCURSORINFO cursor
;
325 GETFOREGROUNDWINDOW win
;
326 GETQUEUESTATUS queue
;
329 (GETFOREGROUNDWINDOW
) GetProcAddress(user
,
330 "GetForegroundWindow");
331 cursor
= (GETCURSORINFO
) GetProcAddress(user
, "GetCursorInfo");
332 queue
= (GETQUEUESTATUS
) GetProcAddress(user
, "GetQueueStatus");
337 RAND_add(&h
, sizeof(h
), 0);
341 * unfortunately, its not safe to call GetCursorInfo() on NT4
342 * even though it exists in SP3 (or SP6) and higher.
344 if (check_winnt() && !check_win_minplat(5))
348 /* cursor position */
349 /* assume 2 bytes of entropy */
351 ci
.cbSize
= sizeof(CURSORINFO
);
353 RAND_add(&ci
, ci
.cbSize
, 2);
357 /* message queue status */
358 /* assume 1 byte of entropy */
359 w
= queue(QS_ALLEVENTS
);
360 RAND_add(&w
, sizeof(w
), 1);
367 * Toolhelp32 snapshot: enumerate processes, threads, modules and heap
368 * http://msdn.microsoft.com/library/psdk/winbase/toolhelp_5pfd.htm
369 * (Win 9x and 2000 only, not available on NT)
371 * This seeding method was proposed in Peter Gutmann, Software
372 * Generation of Practically Strong Random Numbers,
373 * http://www.usenix.org/publications/library/proceedings/sec98/gutmann.html
374 * revised version at http://www.cryptoengines.com/~peter/06_random.pdf
375 * (The assignment of entropy estimates below is arbitrary, but based
376 * on Peter's analysis the full poll appears to be safe. Additional
377 * interactive seeding is encouraged.)
381 CREATETOOLHELP32SNAPSHOT snap
;
382 CLOSETOOLHELP32SNAPSHOT close_snap
;
385 HEAP32FIRST heap_first
;
386 HEAP32NEXT heap_next
;
387 HEAP32LIST heaplist_first
, heaplist_next
;
388 PROCESS32 process_first
, process_next
;
389 THREAD32 thread_first
, thread_next
;
390 MODULE32 module_first
, module_next
;
399 snap
= (CREATETOOLHELP32SNAPSHOT
)
400 GetProcAddress(kernel
, "CreateToolhelp32Snapshot");
401 close_snap
= (CLOSETOOLHELP32SNAPSHOT
)
402 GetProcAddress(kernel
, "CloseToolhelp32Snapshot");
403 heap_first
= (HEAP32FIRST
) GetProcAddress(kernel
, "Heap32First");
404 heap_next
= (HEAP32NEXT
) GetProcAddress(kernel
, "Heap32Next");
406 (HEAP32LIST
) GetProcAddress(kernel
, "Heap32ListFirst");
408 (HEAP32LIST
) GetProcAddress(kernel
, "Heap32ListNext");
410 (PROCESS32
) GetProcAddress(kernel
, "Process32First");
412 (PROCESS32
) GetProcAddress(kernel
, "Process32Next");
413 thread_first
= (THREAD32
) GetProcAddress(kernel
, "Thread32First");
414 thread_next
= (THREAD32
) GetProcAddress(kernel
, "Thread32Next");
415 module_first
= (MODULE32
) GetProcAddress(kernel
, "Module32First");
416 module_next
= (MODULE32
) GetProcAddress(kernel
, "Module32Next");
418 if (snap
&& heap_first
&& heap_next
&& heaplist_first
&&
419 heaplist_next
&& process_first
&& process_next
&&
420 thread_first
&& thread_next
&& module_first
&&
421 module_next
&& (handle
= snap(TH32CS_SNAPALL
, 0))
422 != INVALID_HANDLE_VALUE
) {
423 /* heap list and heap walking */
425 * HEAPLIST32 contains 3 fields that will change with each
426 * entry. Consider each field a source of 1 byte of entropy.
427 * HEAPENTRY32 contains 5 fields that will change with each
428 * entry. Consider each field a source of 1 byte of entropy.
430 ZeroMemory(&hlist
, sizeof(HEAPLIST32
));
431 hlist
.dwSize
= sizeof(HEAPLIST32
);
433 starttime
= GetTickCount();
435 if (heaplist_first(handle
, &hlist
)) {
437 * following discussion on dev ML, exception on WinCE (or
438 * other Win platform) is theoretically of unknown
439 * origin; prevent infinite loop here when this
440 * theoretical case occurs; otherwise cope with the
441 * expected (MSDN documented) exception-throwing
442 * behaviour of Heap32Next() on WinCE.
444 * based on patch in original message by Tanguy Fautré
445 * (2009/03/02) Subject: RAND_poll() and
446 * CreateToolhelp32Snapshot() stability
448 int ex_cnt_limit
= 42;
450 RAND_add(&hlist
, hlist
.dwSize
, 3);
452 ZeroMemory(&hentry
, sizeof(HEAPENTRY32
));
453 hentry
.dwSize
= sizeof(HEAPENTRY32
);
454 if (heap_first(&hentry
,
459 RAND_add(&hentry
, hentry
.dwSize
, 5);
460 while (heap_next(&hentry
)
462 || (GetTickCount() - starttime
) <
467 __except(EXCEPTION_EXECUTE_HANDLER
) {
469 * ignore access violations when walking the heap
474 } while (heaplist_next(handle
, &hlist
)
476 || (GetTickCount() - starttime
) < MAXDELAY
)
477 && ex_cnt_limit
> 0);
480 if (heaplist_first(handle
, &hlist
)) {
482 RAND_add(&hlist
, hlist
.dwSize
, 3);
483 hentry
.dwSize
= sizeof(HEAPENTRY32
);
484 if (heap_first(&hentry
,
489 RAND_add(&hentry
, hentry
.dwSize
, 5);
490 while (heap_next(&hentry
)
493 } while (heaplist_next(handle
, &hlist
)
495 || (GetTickCount() - starttime
) < MAXDELAY
));
499 /* process walking */
501 * PROCESSENTRY32 contains 9 fields that will change with
502 * each entry. Consider each field a source of 1 byte of
505 p
.dwSize
= sizeof(PROCESSENTRY32
);
508 starttime
= GetTickCount();
509 if (process_first(handle
, &p
))
511 RAND_add(&p
, p
.dwSize
, 9);
512 while (process_next(handle
, &p
)
514 || (GetTickCount() - starttime
) < MAXDELAY
));
518 * THREADENTRY32 contains 6 fields that will change with each
519 * entry. Consider each field a source of 1 byte of entropy.
521 t
.dwSize
= sizeof(THREADENTRY32
);
523 starttime
= GetTickCount();
524 if (thread_first(handle
, &t
))
526 RAND_add(&t
, t
.dwSize
, 6);
527 while (thread_next(handle
, &t
)
529 || (GetTickCount() - starttime
) < MAXDELAY
));
533 * MODULEENTRY32 contains 9 fields that will change with each
534 * entry. Consider each field a source of 1 byte of entropy.
536 m
.dwSize
= sizeof(MODULEENTRY32
);
538 starttime
= GetTickCount();
539 if (module_first(handle
, &m
))
541 RAND_add(&m
, m
.dwSize
, 9);
542 while (module_next(handle
, &m
)
544 || (GetTickCount() - starttime
) < MAXDELAY
));
555 # endif /* !OPENSSL_SYS_WINCE */
560 /* memory usage statistics */
561 GlobalMemoryStatus(&mst
);
562 RAND_add(&mst
, sizeof(mst
), 1);
565 w
= GetCurrentProcessId();
566 RAND_add(&w
, sizeof(w
), 1);
571 int RAND_event(UINT iMsg
, WPARAM wParam
, LPARAM lParam
)
573 double add_entropy
= 0;
586 static int lastx
, lasty
, lastdx
, lastdy
;
593 if (dx
!= 0 && dy
!= 0 && dx
- lastdx
!= 0 && dy
- lastdy
!= 0)
595 lastx
= x
, lasty
= y
;
596 lastdx
= dx
, lastdy
= dy
;
602 RAND_add(&iMsg
, sizeof(iMsg
), add_entropy
);
603 RAND_add(&wParam
, sizeof(wParam
), 0);
604 RAND_add(&lParam
, sizeof(lParam
), 0);
606 return (RAND_status());
609 void RAND_screen(void)
610 { /* function available for backward
616 /* feed timing information to the PRNG */
617 static void readtimer(void)
621 static int have_perfc
= 1;
622 # if defined(_MSC_VER) && defined(_M_X86)
623 static int have_tsc
= 1;
629 _emit
0x0f _emit
0x31 mov cyclecount
, eax
}
630 RAND_add(&cyclecount
, sizeof(cyclecount
), 1);
632 __except(EXCEPTION_EXECUTE_HANDLER
) {
641 if (QueryPerformanceCounter(&l
) == 0)
644 RAND_add(&l
, sizeof(l
), 0);
647 if (!have_tsc
&& !have_perfc
) {
649 RAND_add(&w
, sizeof(w
), 0);
653 /* feed screen contents to PRNG */
654 /*****************************************************************************
656 * Created 960901 by Gertjan van Oosten, gertjan@West.NL, West Consulting B.V.
659 * <URL:http://support.microsoft.com/default.aspx?scid=kb;[LN];97193>;
660 * the original copyright message is:
662 * (C) Copyright Microsoft Corp. 1993. All rights reserved.
664 * You have a royalty-free right to use, modify, reproduce and
665 * distribute the Sample Files (and/or any modified version) in
666 * any way you find useful, provided that you agree that
667 * Microsoft has no warranty obligations or liability for any
668 * Sample Application Files which are modified.
671 static void readscreen(void)
673 # if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN)
674 HDC hScrDC
; /* screen DC */
675 HBITMAP hBitmap
; /* handle for our bitmap */
676 BITMAP bm
; /* bitmap properties */
677 unsigned int size
; /* size of bitmap */
678 char *bmbits
; /* contents of bitmap */
679 int w
; /* screen width */
680 int h
; /* screen height */
681 int y
; /* y-coordinate of screen lines to grab */
682 int n
= 16; /* number of screen lines to grab at a time */
683 BITMAPINFOHEADER bi
; /* info about the bitmap */
685 if (check_winnt() && OPENSSL_isservice() > 0)
688 /* Get a reference to the screen DC */
689 hScrDC
= GetDC(NULL
);
691 /* Get screen resolution */
692 w
= GetDeviceCaps(hScrDC
, HORZRES
);
693 h
= GetDeviceCaps(hScrDC
, VERTRES
);
695 /* Create a bitmap compatible with the screen DC */
696 hBitmap
= CreateCompatibleBitmap(hScrDC
, w
, n
);
698 /* Get bitmap properties */
699 GetObject(hBitmap
, sizeof(BITMAP
), (LPSTR
) & bm
);
700 size
= (unsigned int)bm
.bmWidthBytes
* bm
.bmHeight
* bm
.bmPlanes
;
702 bi
.biSize
= sizeof(BITMAPINFOHEADER
);
703 bi
.biWidth
= bm
.bmWidth
;
704 bi
.biHeight
= bm
.bmHeight
;
705 bi
.biPlanes
= bm
.bmPlanes
;
706 bi
.biBitCount
= bm
.bmBitsPixel
;
707 bi
.biCompression
= BI_RGB
;
709 bi
.biXPelsPerMeter
= 0;
710 bi
.biYPelsPerMeter
= 0;
712 bi
.biClrImportant
= 0;
714 bmbits
= OPENSSL_malloc(size
);
715 if (bmbits
!= NULL
) {
716 /* Now go through the whole screen, repeatedly grabbing n lines */
717 for (y
= 0; y
< h
- n
; y
+= n
) {
718 unsigned char md
[MD_DIGEST_LENGTH
];
720 /* Copy the bits of the current line range into the buffer */
721 GetDIBits(hScrDC
, hBitmap
, y
, n
,
722 bmbits
, (BITMAPINFO
*) & bi
, DIB_RGB_COLORS
);
724 /* Get the hash of the bitmap */
725 MD(bmbits
, size
, md
);
727 /* Seed the random generator with the hash value */
728 RAND_add(md
, MD_DIGEST_LENGTH
, 0);
731 OPENSSL_free(bmbits
);
735 DeleteObject(hBitmap
);
736 ReleaseDC(NULL
, hScrDC
);
737 # endif /* !OPENSSL_SYS_WINCE */