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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "internal/cryptlib.h"
#include <openssl/rand.h>
#include "rand_lcl.h"
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
# include <windows.h>
# 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 milliseconds 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);
/*
* 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 */
int RAND_poll(void)
{
MEMORYSTATUS mst;
HCRYPTPROV hProvider = 0;
DWORD w;
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 | CRYPT_SILENT)) {
if (CryptGenRandom(hProvider, sizeof(buf), buf) != 0) {
RAND_add(buf, sizeof(buf), sizeof(buf));
}
CryptReleaseContext(hProvider, 0);
}
/* poll the Pentium PRG with CryptoAPI */
if (CryptAcquireContextW(&hProvider, NULL, INTEL_DEF_PROV, PROV_INTEL_SEC, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
if (CryptGenRandom(hProvider, sizeof(buf), buf) != 0) {
RAND_add(buf, sizeof(buf), sizeof(buf));
}
CryptReleaseContext(hProvider, 0);
}
/* timer data */
readtimer();
/* memory usage statistics */
GlobalMemoryStatus(&mst);
RAND_add(&mst, sizeof(mst), 1);
/* process ID */
w = GetCurrentProcessId();
RAND_add(&w, sizeof(w), 1);
return (1);
}
int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
{
double add_entropy = 0;
switch (iMsg) {
case WM_KEYDOWN:
{
static WPARAM key;
if (key != wParam)
add_entropy = 0.05;
key = wParam;
}
break;
case WM_MOUSEMOVE:
{
static int lastx, lasty, lastdx, lastdy;
int x, y, dx, dy;
x = LOWORD(lParam);
y = HIWORD(lParam);
dx = lastx - x;
dy = lasty - y;
if (dx != 0 && dy != 0 && dx - lastdx != 0 && dy - lastdy != 0)
add_entropy = .2;
lastx = x, lasty = y;
lastdx = dx, lastdy = dy;
}
break;
}
readtimer();
RAND_add(&iMsg, sizeof(iMsg), add_entropy);
RAND_add(&wParam, sizeof(wParam), 0);
RAND_add(&lParam, sizeof(lParam), 0);
return (RAND_status());
}
/* feed timing information to the PRNG */
static void readtimer(void)
{
DWORD w;
LARGE_INTEGER l;
static int have_perfc = 1;
# if defined(_MSC_VER) && defined(_M_X86)
static int have_tsc = 1;
DWORD cyclecount;
if (have_tsc) {
__try {
__asm {
_emit 0x0f _emit 0x31 mov cyclecount, eax}
RAND_add(&cyclecount, sizeof(cyclecount), 1);
}
__except(EXCEPTION_EXECUTE_HANDLER) {
have_tsc = 0;
}
}
# else
# define have_tsc 0
# endif
if (have_perfc) {
if (QueryPerformanceCounter(&l) == 0)
have_perfc = 0;
else
RAND_add(&l, sizeof(l), 0);
}
if (!have_tsc && !have_perfc) {
w = GetTickCount();
RAND_add(&w, sizeof(w), 0);
}
}
#endif
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