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