;*********************************************
; Example script
; ENCRYPT A FILE INTO A SELF-EXTRACTING EXE
; by: JFish
;
;********************************************

#include <ButtonConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>

#include <Crypt.au3> ; will be used for the encryption
#include <File.au3> ; will be used to manipulate au3 file before we compile

#Region ### START Koda GUI section ### Form=C:\Users\RC01712\Documents\Scripts\Encrypt Tool\encrypt_GUI.kxf
$Form1 = GUICreate("Form1", 657, 244, 192, 132)
$sourceInput = GUICtrlCreateInput("", 144, 48, 337, 24)
$sourceBtn = GUICtrlCreateButton("Browse", 40, 48, 89, 25)
$encryptBtn = GUICtrlCreateButton("Encrypt", 224, 128, 145, 33)
$passwordInput = GUICtrlCreateInput("", 144, 80, 337, 24)
$Label1 = GUICtrlCreateLabel("Password", 40, 80, 73, 24)
GUICtrlSetFont(-1, 10, 400, 0, "MS Sans Serif")
$decryptBtn = GUICtrlCreateButton("Decrypt", 224, 176, 145, 33)
GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###

; var declaration for global scope
global $sourceFile, $password, $filename, $filenameRoot, $fileExtension, $publicEncFileNameFullPath, $publicEncFileName

; select a source file that we want to encrypt
func _selectFile()
	GUICtrlSetData($sourceInput,"")
	$filename=""
	$sourceFile=FileOpenDialog("Please select a file to encrypt",@ScriptDir,"All (*.*)")
	$dirLen=stringlen(@WorkingDir)+1
	;grab the file name
	$filename=StringTrimLeft($sourceFile,$dirLen)
	$firstDot=stringinstr($filename,".",0,-1)
	;grab the file root name without the extension
	$filenameRoot=stringtrimright($filename,stringlen($filename)-$firstDot+1)
	;grab the file extension
	$fileExtension=stringtrimleft($filename,$firstDot-1)
	;MsgBox("","",$fileExtension)
	GUICtrlSetData($sourceInput,$sourceFile)
EndFunc

func _encrypt()
$password = GUICtrlRead($passwordInput)
if $password="" then
	MsgBox("","","please enter a password")
Else
	; encrypt the file NOTE: method in example of AES 256 is hard coded
	$result =_Crypt_EncryptFile($sourceFile,@ScriptDir&"\"&$filenameRoot&"_enc"&$fileExtension,$password,$CALG_AES_256)
	; if the encryptions works ...
		if $result Then
			; set the full path name to the file including the new "_enc" showing that it is encrypted
			$publicEncFileNameFullPath=@ScriptDir&"\"&$filenameRoot&"_enc"&$fileExtension
			; setr the name of the encrypted file without the path
			$publicEncFileName=$filenameRoot&"_enc"&$fileExtension
			; call the function to create the exe
			_createEXE($publicEncFileName,$publicEncFileName)
		else
			MsgBox("","","encryption error")
		EndIf
	MsgBox("","Encrypt status",$result)
EndIf
EndFunc


func _createEXE($publicEncFileNameFullPath,$publicEncFileName)

;*****************************************************************
; This functions writes an au3 file that will get compiled and become our
; 'self extracting' encrypted file and program to decrypt
; The biggest issue is embedding the encrypted file with fileinstall
; b/c it does not take variable path names
;******************************************************************

; craete an INI file with the full path name and file name of the encrypted file
IniWrite(@ScriptDir&"\temp.ini","filedata","filename",$publicEncFileName)
IniWrite(@ScriptDir&"\temp.ini","filedata","filepath",@ScriptDir&"\"&$publicEncFileName)

; stuff our au3 script into a variable called "wrapper"
; NOTE: there are two spots called "REPLACEME" and "REPLACEFILENAME" that will get replaced with ini text
$wrapper='#include <Crypt.au3>'&@crlf& _
'local $readFileName="REPLACEFILENAME"'&@crlf& _
'MsgBox("","",$readFileName)'&@crlf& _
'if FileExists(@ScriptDir&"\"&$readFileName) Then'&@crlf& _
'Else'&@crlf& _
'FileInstall("REPLACEME",@ScriptDir&"\"&$readFileName,1)'&@crlf& _
'EndIf'&@crlf& _
'$passkey=InputBox("Please enter the decryption password","PASSWORD","","*",400,150)' &@crlf& _
'local $newfilename=stringreplace($readFileName,"_enc","_dec")'&@crlf& _
'$firstDot=stringinstr($readFileName,".",0,-1)'&@crlf& _
'$fileExtension=stringtrimleft($readFileName,$firstDot-1)'&@crlf& _
'if _Crypt_DecryptFile($readFileName, @ScriptDir&"\"&$newfilename&$fileExtension, $passkey, $CALG_AES_256) Then'&@crlf& _
'Else'&@crlf& _
'	MsgBox("","","invalid password")'&@crlf& _
'	Exit'&@crlf& _
'EndIf'
; open a new file for our "standalone" decryption program
$tempFile=fileopen(@ScriptDir&"\standalone.au3",2)
FileWrite($tempFile,$wrapper)
FileClose($tempFile)
;after the au3 file is created read in the filename of the file to install and replace the text
$readFileName=IniRead(@ScriptDir&"\temp.ini","filedata","filename","decryptedfile.txt")
_ReplaceStringInFile (@ScriptDir&"\standalone.au3", "REPLACEFILENAME",$readFileName)
; after the au3 file is created read in the full path of the file to install and replace the text in au3
local $readFilePath=IniRead(@ScriptDir&"\temp.ini","filedata","filepath","default")
_ReplaceStringInFile (@ScriptDir&"\standalone.au3", "REPLACEME",$readFilePath)
;compile the au3 file into an executable using the command line
ShellExecuteWait("Aut2exe.exe"," /in standalone.au3 /out "&$filenameRoot&".exe",@ScriptDir)
;delete the temporary au3 file
FileDelete(@ScriptDir&"\standalone.au3")
EndFunc


;*************************************************
; This function will decrypt the file from the UI
; used to create the encrypted file (make sure you
; select the new name with the _enc first
;************************************************
func _decrypt()
$password = GUICtrlRead($passwordInput)
if $password="" then
	MsgBox("","","please enter a password")
Else
	local $newfilename=stringreplace($filenameRoot,"_enc","_dec")
	$result=_Crypt_DecryptFile($sourceFile, @ScriptDir&"\"&$newfilename&$fileExtension, $password, $CALG_AES_256)
	;MsgBox("","decrypt status",$result)
EndIf
EndFunc


While 1
	$nMsg = GUIGetMsg()
	Switch $nMsg
		case $sourceBtn
			_selectFile()
		case $encryptBtn
			_encrypt()
		case $decryptBtn
			_decrypt()
		Case $GUI_EVENT_CLOSE
			Exit
	EndSwitch
WEnd