HWID-Checker-Windows.go

package main

//Credits to https://github.com/atotto/clipboard/blob/master/clipboard_windows.go
//Credits to https://github.com/denisbrodbeck/machineid
import (
	"fmt"
	"log"
	"os"
	"syscall"
	"time"
	"unsafe"

	"golang.org/x/sys/windows/registry"
)

const (
	cfUnicodetext = 13
	gmemMoveable  = 0x0002
)

var (
	user32           = syscall.MustLoadDLL("user32")
	openClipboard    = user32.MustFindProc("OpenClipboard")
	closeClipboard   = user32.MustFindProc("CloseClipboard")
	emptyClipboard   = user32.MustFindProc("EmptyClipboard")
	getClipboardData = user32.MustFindProc("GetClipboardData")
	setClipboardData = user32.MustFindProc("SetClipboardData")

	kernel32     = syscall.NewLazyDLL("kernel32")
	globalAlloc  = kernel32.NewProc("GlobalAlloc")
	globalFree   = kernel32.NewProc("GlobalFree")
	globalLock   = kernel32.NewProc("GlobalLock")
	globalUnlock = kernel32.NewProc("GlobalUnlock")
	lstrcpy      = kernel32.NewProc("lstrcpyW")
)

// waitOpenClipboard opens the clipboard, waiting for up to a second to do so.
func waitOpenClipboard() error {
	started := time.Now()
	limit := started.Add(time.Second)
	var r uintptr
	var err error
	for time.Now().Before(limit) {
		r, _, err = openClipboard.Call(0)
		if r != 0 {
			return nil
		}
		time.Sleep(time.Millisecond)
	}
	return err
}

//Write to clipboard
func writeAll(text string) error {
	err := waitOpenClipboard()
	if err != nil {
		return err
	}
	defer closeClipboard.Call()

	r, _, err := emptyClipboard.Call(0)
	if r == 0 {
		return err
	}

	data := syscall.StringToUTF16(text)

	// "If the hMem parameter identifies a memory object, the object must have
	// been allocated using the function with the GMEM_MOVEABLE flag."
	h, _, err := globalAlloc.Call(gmemMoveable, uintptr(len(data)*int(unsafe.Sizeof(data[0]))))
	if h == 0 {
		return err
	}
	defer func() {
		if h != 0 {
			globalFree.Call(h)
		}
	}()

	l, _, err := globalLock.Call(h)
	if l == 0 {
		return err
	}

	r, _, err = lstrcpy.Call(l, uintptr(unsafe.Pointer(&data[0])))
	if r == 0 {
		return err
	}

	r, _, err = globalUnlock.Call(h)
	if r == 0 {
		if err.(syscall.Errno) != 0 {
			return err
		}
	}

	r, _, err = setClipboardData.Call(cfUnicodetext, h)
	if r == 0 {
		return err
	}
	h = 0 // suppress deferred cleanup
	return nil
}

//Main function
func main() {
	fmt.Println("HWID-Checker")
	uuid, err := machineID()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println("Your HWID is :", uuid)
	writeAll(uuid)
	fmt.Println("Copied to your clipboard!")
	fmt.Printf("Press enter to exit...")
	//Prevent auto closing
	b := make([]byte, 1)
	os.Stdin.Read(b)

}

// machineID returns the key MachineGuid in registry `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography`.
// If there is an error running the commad an empty string is returned.
func machineID() (string, error) {
	k, err := registry.OpenKey(registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Cryptography`, registry.QUERY_VALUE|registry.WOW64_64KEY)
	if err != nil {
		return "", err
	}
	defer k.Close()

	s, _, err := k.GetStringValue("MachineGuid")
	if err != nil {
		return "", err
	}
	return s, nil
}