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winrand.c
/* apps/winrand.c */
/* ====================================================================
 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

/* Usage: winrand [filename]
 *
 * Collects entropy from mouse movements and other events and writes
 * random data to filename or .rnd
 */

#include <windows.h>
#include <openssl/opensslv.h>
#include <openssl/rand.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
const char *filename;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
        PSTR cmdline, int iCmdShow)
      {
      static char appname[] = "OpenSSL";
      HWND hwnd;
      MSG msg;
      WNDCLASSEX wndclass;
        char buffer[200];

        if (cmdline[0] == '\0')
                filename = RAND_file_name(buffer, sizeof buffer);
        else
                filename = cmdline;

        RAND_load_file(filename, -1);

      wndclass.cbSize = sizeof(wndclass);
      wndclass.style = CS_HREDRAW | CS_VREDRAW;
      wndclass.lpfnWndProc = WndProc;
      wndclass.cbClsExtra = 0;
      wndclass.cbWndExtra = 0;
      wndclass.hInstance = hInstance;
      wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
      wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
      wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
      wndclass.lpszMenuName = NULL;
        wndclass.lpszClassName = appname;
      wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
      RegisterClassEx(&wndclass);

        hwnd = CreateWindow(appname, OPENSSL_VERSION_TEXT,
            WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,
            CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);

      ShowWindow(hwnd, iCmdShow);
      UpdateWindow(hwnd);


      while (GetMessage(&msg, NULL, 0, 0))
            {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
            }

      return msg.wParam;
      }

LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
      {
        HDC hdc;
      PAINTSTRUCT ps;
        RECT rect;
        static int seeded = 0;

      switch (iMsg)
            {
      case WM_PAINT:
            hdc = BeginPaint(hwnd, &ps);
            GetClientRect(hwnd, &rect);
                DrawText(hdc, "Seeding the PRNG. Please move the mouse!", -1,
                  &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
            EndPaint(hwnd, &ps);
            return 0;
            
        case WM_DESTROY:
                PostQuitMessage(0);
                return 0;
                }

        if (RAND_event(iMsg, wParam, lParam) == 1 && seeded == 0)
                {
                seeded = 1;
                if (RAND_write_file(filename) <= 0)
                        MessageBox(hwnd, "Couldn't write random file!",
                        "OpenSSL", MB_OK | MB_ICONERROR);
                PostQuitMessage(0);
                }

      return DefWindowProc(hwnd, iMsg, wParam, lParam);
      }

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