Commit c97b11f4 authored by Ulf Möller's avatar Ulf Möller
Browse files

New function RAND_event() collects entropy from Windows events.

parent 2501b335

crypto/rand/md_rand.c

+41 −0
Original line number Diff line number Diff line
@@ -568,6 +568,47 @@ static int ssleay_rand_status(void) 
#include <windows.h>

#include <openssl/rand.h>



int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)

        {

        double add_entropy=0;

        SYSTEMTIME t;



        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)

                                entropy += .2;

                        lastx=x,lasty=y;

                        lastdx=dx, lastdy=dy;

                        }

		break;

		}



        GetSystemTime(&t);

        RAND_add(&iMsg, sizeof(iMsg), add_entropy);

	RAND_add(&wParam, sizeof(wParam), 0);

	RAND_add(&lParam, sizeof(lParam), 0);

        RAND_add(&t, sizeof(t), 0);



	return (RAND_status());

	}



/*****************************************************************************

 * Initialisation function for the SSL random generator.  Takes the contents

 * of the screen as random seed.

crypto/rand/rand.h

+2 −0
Original line number Diff line number Diff line
@@ -91,7 +91,9 @@ const char *RAND_file_name(char *file,int num); 
int RAND_status(void);

int RAND_egd(const char *path);

#if defined(WINDOWS) || defined(WIN32)

#include <windows.h>

void RAND_screen(void);

int RAND_event(UINT, WPARAM, LPARAM);

#endif

void	ERR_load_RAND_strings(void);