+#ifndef _WIN32_WINNT
+# define _WIN32_WINNT 0x0400
+#endif
+#include <wincrypt.h>
+#include <tlhelp32.h>
+
+/* 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 "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 */
+
+typedef BOOL (WINAPI *CRYPTACQUIRECONTEXT)(HCRYPTPROV *, LPCTSTR, LPCTSTR,
+ 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 *HEAP32FIRST)(LPHEAPENTRY32, DWORD, DWORD);
+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 */
+
+int RAND_poll(void)
+{
+ MEMORYSTATUS m;
+ HCRYPTPROV hProvider = 0;
+ BYTE buf[64];
+ DWORD w;
+ HWND h;
+
+ HMODULE advapi, kernel, user, netapi;
+ CRYPTACQUIRECONTEXT acquire = 0;
+ CRYPTGENRANDOM gen = 0;
+ CRYPTRELEASECONTEXT release = 0;
+#if 1 /* There was previously a problem with NETSTATGET. Currently, this
+ * section is still experimental, but if all goes well, this conditional
+ * will be removed
+ */
+ NETSTATGET netstatget = 0;
+ NETFREE netfree = 0;
+#endif /* 1 */
+
+ /* 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 ) ;
+
+ /* load functions dynamically - not available on all systems */
+ advapi = LoadLibrary("ADVAPI32.DLL");
+ kernel = LoadLibrary("KERNEL32.DLL");
+ user = LoadLibrary("USER32.DLL");
+ netapi = LoadLibrary("NETAPI32.DLL");
+
+#if 1 /* There was previously a problem with NETSTATGET. Currently, this
+ * section is still experimental, but if all goes well, this conditional
+ * will be removed
+ */
+ 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);
+#endif /* 1 */
+
+ /* 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.
+ */
+ 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, "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);
+ }
+ if (buf)
+ free(buf);
+ }
+
+ if (advapi)
+ {
+ acquire = (CRYPTACQUIRECONTEXT) GetProcAddress(advapi,
+ "CryptAcquireContextA");
+ 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, 0, 0, PROV_RSA_FULL,
+ CRYPT_VERIFYCONTEXT))
+ {
+ if (gen(hProvider, sizeof(buf), buf) != 0)
+ {
+ RAND_add(buf, sizeof(buf), sizeof(buf));
+#ifdef DEBUG
+ printf("randomness from PROV_RSA_FULL\n");