apps/winrand.c

   1 /*
   2  * Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*-
  11  * Usage: winrand [filename]
  12  *
  13  * Collects entropy from mouse movements and other events and writes
  14  * random data to filename or .rnd
  15  */
  16
  17 #include <windows.h>
  18 #include <openssl/opensslv.h>
  19 #include <openssl/rand.h>
  20
  21 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
  22 const char *filename;
  23
  24 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
  25                    PSTR cmdline, int iCmdShow)
  26 {
  27     static char appname[] = "OpenSSL";
  28     HWND hwnd;
  29     MSG msg;
  30     WNDCLASSEX wndclass;
  31     char buffer[200];
  32
  33     if (cmdline[0] == '\0')
  34         filename = RAND_file_name(buffer, sizeof buffer);
  35     else
  36         filename = cmdline;
  37
  38     RAND_load_file(filename, -1);
  39
  40     wndclass.cbSize = sizeof(wndclass);
  41     wndclass.style = CS_HREDRAW | CS_VREDRAW;
  42     wndclass.lpfnWndProc = WndProc;
  43     wndclass.cbClsExtra = 0;
  44     wndclass.cbWndExtra = 0;
  45     wndclass.hInstance = hInstance;
  46     wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
  47     wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
  48     wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
  49     wndclass.lpszMenuName = NULL;
  50     wndclass.lpszClassName = appname;
  51     wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
  52     RegisterClassEx(&wndclass);
  53
  54     hwnd = CreateWindow(appname, OPENSSL_VERSION_TEXT,
  55                         WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,
  56                         CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance,
  57                         NULL);
  58
  59     ShowWindow(hwnd, iCmdShow);
  60     UpdateWindow(hwnd);
  61
  62     while (GetMessage(&msg, NULL, 0, 0)) {
  63         TranslateMessage(&msg);
  64         DispatchMessage(&msg);
  65     }
  66
  67     return msg.wParam;
  68 }
  69
  70 LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
  71 {
  72     HDC hdc;
  73     PAINTSTRUCT ps;
  74     RECT rect;
  75     static int seeded = 0;
  76
  77     switch (iMsg) {
  78     case WM_PAINT:
  79         hdc = BeginPaint(hwnd, &ps);
  80         GetClientRect(hwnd, &rect);
  81         DrawText(hdc, "Seeding the PRNG. Please move the mouse!", -1,
  82                  &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
  83         EndPaint(hwnd, &ps);
  84         return 0;
  85
  86     case WM_DESTROY:
  87         PostQuitMessage(0);
  88         return 0;
  89     }
  90
  91     if (RAND_event(iMsg, wParam, lParam) == 1 && seeded == 0) {
  92         seeded = 1;
  93         if (RAND_write_file(filename) <= 0)
  94             MessageBox(hwnd, "Couldn't write random file!",
  95                        "OpenSSL", MB_OK | MB_ICONERROR);
  96         PostQuitMessage(0);
  97     }
  98
  99     return DefWindowProc(hwnd, iMsg, wParam, lParam);
 100 }