+#ifndef _WIN32_WINNT
+# define _WIN32_WINNT 0x0400
+#endif
+#include <wincrypt.h>
+#include <tlhelp32.h>
+
+/* Limit the time spent walking through the heap, processes, threads and modules to
+ a maximum of 1000 miliseconds each, unless CryptoGenRandom failed */
+#define MAXDELAY 1000
+
+/* Intel hardware RNG CSP -- available from
+ * http://developer.intel.com/design/security/rng/redist_license.htm
+ */
+#define PROV_INTEL_SEC 22
+#define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
+
+static void readtimer(void);
+static void readscreen(void);
+
+/* It appears like CURSORINFO, PCURSORINFO and LPCURSORINFO are only defined
+ when WINVER is 0x0500 and up, which currently only happens on Win2000.
+ Unfortunately, those are typedefs, so they're a little bit difficult to
+ detect properly. On the other hand, the macro CURSOR_SHOWING is defined
+ within the same conditional, so it can be use to detect the absence of said
+ typedefs. */
+
+#ifndef CURSOR_SHOWING
+/*
+ * Information about the global cursor.
+ */
+typedef struct tagCURSORINFO
+{
+ DWORD cbSize;
+ DWORD flags;
+ HCURSOR hCursor;
+ POINT ptScreenPos;
+} CURSORINFO, *PCURSORINFO, *LPCURSORINFO;
+
+#define CURSOR_SHOWING 0x00000001
+#endif /* CURSOR_SHOWING */
+
+#if !defined(OPENSSL_SYS_WINCE)
+typedef BOOL (WINAPI *CRYPTACQUIRECONTEXTW)(HCRYPTPROV *, LPCWSTR, LPCWSTR,
+ DWORD, DWORD);
+typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV, DWORD, BYTE *);
+typedef BOOL (WINAPI *CRYPTRELEASECONTEXT)(HCRYPTPROV, DWORD);
+
+typedef HWND (WINAPI *GETFOREGROUNDWINDOW)(VOID);
+typedef BOOL (WINAPI *GETCURSORINFO)(PCURSORINFO);
+typedef DWORD (WINAPI *GETQUEUESTATUS)(UINT);
+
+typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
+typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
+typedef BOOL (WINAPI *HEAP32FIRST)(LPHEAPENTRY32, DWORD, size_t);
+typedef BOOL (WINAPI *HEAP32NEXT)(LPHEAPENTRY32);
+typedef BOOL (WINAPI *HEAP32LIST)(HANDLE, LPHEAPLIST32);
+typedef BOOL (WINAPI *PROCESS32)(HANDLE, LPPROCESSENTRY32);
+typedef BOOL (WINAPI *THREAD32)(HANDLE, LPTHREADENTRY32);
+typedef BOOL (WINAPI *MODULE32)(HANDLE, LPMODULEENTRY32);
+
+#include <lmcons.h>
+#include <lmstats.h>
+#if 1 /* The NET API is Unicode only. It requires the use of the UNICODE
+ * macro. When UNICODE is defined LPTSTR becomes LPWSTR. LMSTR was
+ * was added to the Platform SDK to allow the NET API to be used in
+ * non-Unicode applications provided that Unicode strings were still
+ * used for input. LMSTR is defined as LPWSTR.
+ */
+typedef NET_API_STATUS (NET_API_FUNCTION * NETSTATGET)
+ (LPWSTR, LPWSTR, DWORD, DWORD, LPBYTE*);
+typedef NET_API_STATUS (NET_API_FUNCTION * NETFREE)(LPBYTE);
+#endif /* 1 */
+#endif /* !OPENSSL_SYS_WINCE */
+
+int RAND_poll(void)
+{
+ MEMORYSTATUS m;
+ HCRYPTPROV hProvider = 0;
+ DWORD w;
+ int good = 0;
+
+ /* Determine the OS version we are on so we can turn off things
+ * that do not work properly.
+ */
+ OSVERSIONINFO osverinfo ;
+ osverinfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO) ;
+ GetVersionEx( &osverinfo ) ;
+
+#if defined(OPENSSL_SYS_WINCE)
+# if defined(_WIN32_WCE) && _WIN32_WCE>=300
+/* Even though MSDN says _WIN32_WCE>=210, it doesn't seem to be available
+ * in commonly available implementations prior 300... */
+ {
+ BYTE buf[64];
+ /* poll the CryptoAPI PRNG */
+ /* The CryptoAPI returns sizeof(buf) bytes of randomness */
+ if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL,
+ CRYPT_VERIFYCONTEXT))
+ {
+ if (CryptGenRandom(hProvider, sizeof(buf), buf))
+ RAND_add(buf, sizeof(buf), sizeof(buf));
+ CryptReleaseContext(hProvider, 0);
+ }
+ }
+# endif
+#else /* OPENSSL_SYS_WINCE */
+ /*
+ * None of below libraries are present on Windows CE, which is
+ * why we #ifndef the whole section. This also excuses us from
+ * handling the GetProcAddress issue. The trouble is that in
+ * real Win32 API GetProcAddress is available in ANSI flavor
+ * only. In WinCE on the other hand GetProcAddress is a macro
+ * most commonly defined as GetProcAddressW, which accepts
+ * Unicode argument. If we were to call GetProcAddress under
+ * WinCE, I'd recommend to either redefine GetProcAddress as
+ * GetProcAddressA (there seem to be one in common CE spec) or
+ * implement own shim routine, which would accept ANSI argument
+ * and expand it to Unicode.
+ */
+ {
+ /* load functions dynamically - not available on all systems */
+ HMODULE advapi = LoadLibrary(TEXT("ADVAPI32.DLL"));
+ HMODULE kernel = LoadLibrary(TEXT("KERNEL32.DLL"));
+ HMODULE user = NULL;
+ HMODULE netapi = LoadLibrary(TEXT("NETAPI32.DLL"));
+ CRYPTACQUIRECONTEXTW acquire = NULL;
+ CRYPTGENRANDOM gen = NULL;
+ CRYPTRELEASECONTEXT release = NULL;
+ NETSTATGET netstatget = NULL;
+ NETFREE netfree = NULL;
+ BYTE buf[64];
+
+ if (netapi)
+ {
+ netstatget = (NETSTATGET) GetProcAddress(netapi,"NetStatisticsGet");
+ netfree = (NETFREE) GetProcAddress(netapi,"NetApiBufferFree");
+ }
+
+ if (netstatget && netfree)
+ {
+ LPBYTE outbuf;
+ /* NetStatisticsGet() is a Unicode only function
+ * STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0
+ * contains 17 fields. We treat each field as a source of
+ * one byte of entropy.
+ */
+
+ if (netstatget(NULL, L"LanmanWorkstation", 0, 0, &outbuf) == 0)
+ {
+ RAND_add(outbuf, sizeof(STAT_WORKSTATION_0), 45);
+ netfree(outbuf);
+ }
+ if (netstatget(NULL, L"LanmanServer", 0, 0, &outbuf) == 0)
+ {
+ RAND_add(outbuf, sizeof(STAT_SERVER_0), 17);
+ netfree(outbuf);
+ }
+ }
+
+ if (netapi)
+ FreeLibrary(netapi);
+
+ /* It appears like this can cause an exception deep within ADVAPI32.DLL
+ * at random times on Windows 2000. Reported by Jeffrey Altman.
+ * Only use it on NT.
+ */
+ /* Wolfgang Marczy <WMarczy@topcall.co.at> reports that
+ * the RegQueryValueEx call below can hang on NT4.0 (SP6).
+ * So we don't use this at all for now. */
+#if 0
+ if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT &&
+ osverinfo.dwMajorVersion < 5)
+ {
+ /* Read Performance Statistics from NT/2000 registry
+ * The size of the performance data can vary from call
+ * to call so we must guess the size of the buffer to use
+ * and increase its size if we get an ERROR_MORE_DATA
+ * return instead of ERROR_SUCCESS.
+ */
+ LONG rc=ERROR_MORE_DATA;
+ char * buf=NULL;
+ DWORD bufsz=0;
+ DWORD length;
+
+ while (rc == ERROR_MORE_DATA)
+ {
+ buf = realloc(buf,bufsz+8192);
+ if (!buf)
+ break;
+ bufsz += 8192;
+
+ length = bufsz;
+ rc = RegQueryValueEx(HKEY_PERFORMANCE_DATA, TEXT("Global"),
+ NULL, NULL, buf, &length);
+ }
+ if (rc == ERROR_SUCCESS)
+ {
+ /* For entropy count assume only least significant
+ * byte of each DWORD is random.
+ */
+ RAND_add(&length, sizeof(length), 0);
+ RAND_add(buf, length, length / 4.0);
+
+ /* Close the Registry Key to allow Windows to cleanup/close
+ * the open handle
+ * Note: The 'HKEY_PERFORMANCE_DATA' key is implicitly opened
+ * when the RegQueryValueEx above is done. However, if
+ * it is not explicitly closed, it can cause disk
+ * partition manipulation problems.
+ */
+ RegCloseKey(HKEY_PERFORMANCE_DATA);
+ }
+ if (buf)
+ free(buf);
+ }
+#endif
+
+ if (advapi)
+ {
+ /*
+ * If it's available, then it's available in both ANSI
+ * and UNICODE flavors even in Win9x, documentation says.
+ * We favor Unicode...
+ */
+ acquire = (CRYPTACQUIRECONTEXTW) GetProcAddress(advapi,
+ "CryptAcquireContextW");
+ gen = (CRYPTGENRANDOM) GetProcAddress(advapi,
+ "CryptGenRandom");
+ release = (CRYPTRELEASECONTEXT) GetProcAddress(advapi,
+ "CryptReleaseContext");
+ }
+
+ if (acquire && gen && release)
+ {
+ /* poll the CryptoAPI PRNG */
+ /* The CryptoAPI returns sizeof(buf) bytes of randomness */
+ if (acquire(&hProvider, NULL, NULL, PROV_RSA_FULL,
+ CRYPT_VERIFYCONTEXT))
+ {
+ if (gen(hProvider, sizeof(buf), buf) != 0)
+ {
+ RAND_add(buf, sizeof(buf), 0);
+ good = 1;
+#if 0
+ printf("randomness from PROV_RSA_FULL\n");
+#endif
+ }
+ release(hProvider, 0);
+ }
+
+ /* poll the Pentium PRG with CryptoAPI */
+ if (acquire(&hProvider, 0, INTEL_DEF_PROV, PROV_INTEL_SEC, 0))
+ {
+ if (gen(hProvider, sizeof(buf), buf) != 0)
+ {
+ RAND_add(buf, sizeof(buf), sizeof(buf));
+ good = 1;
+#if 0
+ printf("randomness from PROV_INTEL_SEC\n");