#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
static char sClassName[]="guicrypt";
static HINSTANCE zhInstance=NULL;
WNDCLASSEX WndClass;
HWND hwnd;
MSG msg;
zhInstance=hInstance;
WndClass.cbSize=sizeof(WNDCLASSEX);
WndClass.style=CS_DBLCLKS;
WndClass.lpfnWndProc=WndProc;
WndClass.cbClsExtra=0;
WndClass.cbWndExtra=0;
WndClass.hInstance=zhInstance;
WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
WndClass.hbrBackground=(HBRUSH)(COLOR_WINDOW-1);
WndClass.lpszMenuName=NULL;
WndClass.lpszClassName=sClassName;
WndClass.hIconSm=LoadIcon(NULL,IDI_APPLICATION);

if(!RegisterClassEx(&WndClass)){
MessageBox(NULL,"Error registering window","Error",MB_ICONSTOP|MB_OK);
return 0;
}
hwnd=CreateWindowEx(WS_EX_STATICEDGE,
sClassName,
"GUI Crypt - by Hav0c",
WS_SYSMENU|WS_MINIMIZEBOX,
CW_USEDEFAULT,
CW_USEDEFAULT,
300,
200,
HWND_DESKTOP,
NULL,
zhInstance,
NULL);
if(!hwnd){
MessageBox(NULL,"Error creating windows","Error",MB_ICONSTOP|MB_OK);
return 0;
}

ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);

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

return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
HWND text1,text2,key;
switch(msg){
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_CREATE:
text1=CreateWindowEx(0,
"Edit",
"Text to encrypt",
WS_CHILD|WS_VISIBLE|ES_CENTER|WS_BORDER,
30,20,185,20,
hwnd,
(HMENU)1,
0,
NULL);
key=CreateWindowEx(0,
"Edit",
"key",
WS_CHILD|WS_VISIBLE|ES_CENTER|ES_NUMBER|WS_BORDER,
220,20,60,20,
hwnd,
(HMENU)2,
0,
NULL);
CreateWindowEx(0,
"Button",
"Encrypt",
WS_CHILD|WS_VISIBLE|BS_FLAT,
65,60,85,20,
hwnd,
(HMENU)3,
0,
NULL);
CreateWindowEx(0,
"Button",
"Exit",
WS_CHILD|WS_VISIBLE|BS_FLAT,
160,60,85,20,
hwnd,
(HMENU)4,
0,
NULL);
text2=CreateWindowEx(0,
"Edit",
"Decrypted text",
WS_CHILD|WS_VISIBLE|ES_CENTER|ES_READONLY|WS_BORDER,
30,100,185,20,
hwnd,
(HMENU)5,
0,
NULL);

case WM_COMMAND:
switch(wParam){
case 3:
int txt1len=GetWindowTextLength(text1);
char txt1txt[txt1len+1];
GetWindowText(text1,txt1txt,txt1len));
int keylen=GetWindowTextLength(key);
char keytxt[txt2len+1];
GetWindowText(key,keytxt,keylen);

char crypt[sizeof(txt1txt)+1];
int i,ckey;
sscanf(keytxt,"%d",&ckey);

for(i=0;i<strlen(txt1txt);i++) crypt[i]=txt1txt[i]^ckey;

SetWindowText(text2,crypt);

break;
case 4:
ExitProcess(0);
break;
}

default:
return DefWindowProc(hwnd,msg,wParam,lParam);
}
return 0;
}