Looking to encrypt batch scripts but need to edit in-between

[pditty8811]

I am releasing a mod for a game. The main reason why I want to encrypt it is because we've had a history in the past, of people selling the work of modders by taking their work and publishing for sale, and trying to make a buck on their free work.

Could I perhaps add a disclaimer or something? What are my options here?

[carlos]

Edited.

[carlos]

Edited.

[pditty8811]

if the code can still be gotten with a hex editor, then there is no point in encrypting it.

Thank you for your efforts.

Perhaps I should use a disclaimer and not worry about people making money on my free work?

[pditty8811]

How about this:

How do I create a shortcut of a .bat file and choose an icon via script?

Please sepparate the two process so I can use them separately in the future.

[Liviu]

About codification I mistake: The codification is UTF 16 Little Endian.

No, it's not UTF-16LE either. It's just a single byte encoding which happens to start with two characters matching the UTF-16LE BOM marker (0xFF 0xFE).

Granted, that's enough to fool notepad into attempting to display the whole file as UTF-16LE text and, since your default font probably doesn't cover the entire UTF-16 range, end up displaying boxes as placeholders, instead. If notepad used a CJK font, instead, the first character would display as "㈠" (u+3220).

But the rest of the file is single-byte-encoded, and cmd.exe (whether with or without /u) only parses single-byte-encodings (according to the current codepage). I guess you know that already, since the first line in the encoded file (" 2>nul &cls") specifically tries to hide the error message caused by the BOM. If you remove that line and run the rest of the batch, the output is...

Code: Select all

C:\tmp>chcp 1252
Active code page: 1252

C:\tmp>color20.enc.cmd

C:\tmp>ÿþ
'ÿþ' is not recognized as an internal or external command,
operable program or batch file.
##############
This is a test
##############

So, fact remains that cmd.exe cannot read/parse/execute Unicode-encoded batch files, whether UTF-16LE/UTF-16BE/UTF-8. That was my point, and I'll cut this short now since it's not directly related to the main topic.

Liviu

[abc0502]

How about this:

How do I create a shortcut of a .bat file and choose an icon via script?

Please sepparate the two process so I can use them separately in the future.

This is a Function I used Before, it's a VB-script code to create shortcuts and add other properties:

:CreateShortcut <shortcut location+name.lnk> <shortcut application> <shortcut Icon>

( FOR /F "tokens=1*" %%a IN ('findstr "^:scut: " ^< "%~F0"') DO Echo.%%b)>"%TEMP%\Shortcut.vbs"
Cscript //nologo "%TEMP%\Shortcut.vbs" "%~1" "%~2" "%~3"
Goto :EOF

:scut: set WshShell = WScript.CreateObject("WScript.Shell" )
:scut: set oShellLink = WshShell.CreateShortcut( WScript.Arguments(0) )
:scut: oShellLink.TargetPath = chr(34) & WScript.Arguments(1) & chr(34)
:scut: oShellLink.IconLocation = WScript.Arguments(2)
:scut: oShellLink.WindowStyle = 4
:scut: oShellLink.Save

REM ===========================================================
REM >>> IMPORTANT <<< Must Leave Empty Line At The End of Your Batch File ...

Blue text is the options you give to the function, and don't forget to add .lnk to the shortcut name (important)
Red number can be one of three: 3 means maximized window when the application run, 4 means normal window & 7 means minimized window.

and this is how to use it:

Code: Select all

CALL :CreateShortcut "%USERPROFILE%\Desktop\My Link.lnk" "%PROGRAMFILES%\7-Zip\7zFM.exe" "C:\7z Icon.ico" 

you can set other options like working directory, hot key, add arguments to the application when it runs and add description.
For more information have a look at this : Link
Just make sure to add the ":scut: " at the begining of the line and make sure to leave empty line at the end of your batch file.
Also add "WScript.Arguments(X)" in the place where you will input your data ( works like %1 in batch files ) and X is the number in sequence.

[pditty8811]

Thank you.

So the blue texts are all filepaths of the target, application and then the icon?

[abc0502]

Sorry for late answer,
The Function take 3 arguments,
The first is the location (where you will place the shortcut) and the shortcut name including the ".Lnk" extension.
The second is the location of the original file (the one you are creating the shortcut for).
The third is the location to an icon that you will add it to the shortcut.

[pditty8811]

Thank you for the reply. Looks easy enough.

[Aacini]

I developed a method intended to hide the source code of a Batch program, so it may be distributed but preserving the code hidden. Of course, there is no way to keep Batch source code hidden in all cases, but a method that hide Batch programs from most end users is useful without doubt. However, I need some feedback to test my method. The file below is a simple example program that create a text file called Example.txt with a couple lines in it. I invite you to try to break the Batch source code of this program and report how easy/difficult was this task for you. I will appreciate if you made some suggestions in order to improve my encoding method.

To get the real Example.bat program, download the file below and both HexToBin.bat and HexChar.vbs programs from this site and execute: HEXTOBIN EXAMPLE.BAT.HEX

Example.bat.hex:

Code: Select all

406966202840436F646553656374696F6E203D3D204042617463682920407468656E0A4043736372697074202F2F6E6F6C6F
676F202F2F453A4A5363726970742E456E636F64652022257E46302220262040676F746F203A454F4620262040656E640A2F
2F2A2A537461727420456E636F64652A2A23407E5E46774D4141413D3D4026376C2E2C2F5557454D6D7F6F6B5E2B7E272C42
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422B31744B262D09424026502C507E512C42232C402A402A2C32366D6832567F5244364F2D557640265C43442C477355727E
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4523494026376C2E504B3378317372737F50277E47773F36523B2E7F6C4F7F4B7F3659776B5E6E6072A032616C7377736E63
346C4445237040265741555E7362567F520944724F7F60643F4B3B44312B6F725E2B234940264B32556D77725E2B203B564B
2F2B76237040265C6D447E7F6B746A347F56562C7850713F6D4D723259635A4D2B43596E36284C6E6D44634A713F5E2E6277
59206A342B73567262704026096B7455742B5E56635D450960452D72A03261437377567F20346D592D727E2750392B5E5077
4AA033616D3A32567F20346D59774572236940263375774141413D3D5E237E40[1]

I used my encoding method to write a solution for pditty8811's specific needs. The program below is a Batch Encoder that allows to install a Batch program via the modification of certain variables, but keep both the installer and the installed program code in unreadable form.

To get the real BatchEncoder.bat program, download the file below and both HexToBin.bat and HexChar.vbs programs from this site and execute: HEXTOBIN BATCHENCODER.BAT.HEX

BatchEncoder.bat.hex:

Code: Select all

406966202840436F646553656374696F6E203D3D204042617463682920407468656E0D0A0D0A406563686F206F66660D0A0D
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2D78722370402340266F61734541413D3D5E237E40[1]

Previous program create an installer for the original Batch file called InstallOriginalName.bat; when this Batch file run, it ask the user for the value of certain Install Variables and create an installed version of the program called OriginalName.bat again. WARNING! Please note that the installer delete the original file with OriginalName.bat, so you must back up this file with another name if you want to create and test the installed version of a program. The Install Variables must be placed in the Batch file from the third line on with this format:

Code: Select all

set /p "varName=prompt"

For example:

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C:\>TYPE MYPROG.BAT
@echo off
setlocal EnableDelayedExpansion
set /P "source=Source directory:      "
set /P "destination=Destination directory: "
echo The installed source directory is: %source%
echo The installed destination directory is: %destination%

Previous program is prepared for distribution this way:

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C:\>BATCHENCODER MYPROG.BAT
InstallMYPROG.BAT file created

This way, you may distribute InstallMYPROG.BAT file. Any user may install this program this way:

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C:\>INSTALLMYPROG
Enter installation values

Source directory:      C:\MY FOLDER\MY SOURCE
Destination directory: C:\MY FOLDER\MY DESTINATION

Previous step produce MYPROG.BAT encoded file with this installed code:

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@echo off
setlocal EnableDelayedExpansion
set "source=C:\MY FOLDER\MY SOURCE"
set "destination=C:\MY FOLDER\MY DESTINATION"
echo The installed source directory is: %source%
echo The installed destination directory is: %destination%

Only consecutive "SET /P" commands placed in the Batch file from the line number 3 on will be processed this way.

Because some restrictions in the encoder program, you can't use apostrophes in the Batch file; if you require they, use %apostrophe% value instead. For example:

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for /F "delims=" %%a in (%apostrophe%dir /B /AD%apostrophe%) do echo %%a

The definition of apostrophe variable will be inserted by the encoder after the initialization of installation variables. I will eliminate this restriction in a future version of the encoder.

Remember that your program will be protected as long as the user have not chance to review its code. The original Batch code exist only when the Batch program run, so you should NOT use any pauses in the program. If a Batch program read input from the user, you may use a first program that just read the data and store it in variables or in a text file and then execute the encoded program. The idea is that the encoded code run and terminate as fast as possible, so the user have no chance to locate it.

NOTE: You may cheat and use the encoder to write test programs that aids you to break the encoding method used, but remember that the end user have NOT the encoder, just the encoded program. When you attempt to break the code of the first example above you should NOT use any idea provided by the use of the encoder, otherwise your results will not reflect the ones that normal users can get. If you devise a recipe that allows to break the code produced by my encoder, DON'T POST IT PLEASE!

Antonio

[Liviu]

The file below is a simple example program that create a text file called Example.txt with a couple lines in it. I invite you to try to break the Batch source code of this program and report how easy/difficult was this task for you.

In the name of obfuscation, I've left some columns out

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@echo off
setlocal DisableD
set apostrophe='
rem Example of a
echo Hello World!
setlocal EnableDe
set line=
for %%a in (This
   set "line=!lin
)
(
set /P "=%line%wi
echo/
) >> Example.txt

I will appreciate if you made some suggestions in order to improve my encoding method.

What you have is good enough to deter casual snooping. My advice would be to not waste much time trying to foolproof it beyond that, since it's simply not possible given that any batch encoding technique will need a temp file and a cmd instance running it at some point.

Liviu

[carlos]

I read the code and I understand that it is a encoded vbs = vbe file.

Continue with technique I have a "tiny batch compiler". If someone is interested I can posted it.

[Aacini]

If you devise a recipe that allows to break the code produced by my encoder, DON'T POST IT PLEASE!

Antonio

I removed the first characters until end of comment with a hexadecimal editor and run a decoder from:

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Thanks a lot, buddy


Continuing with technique, I don't see how your "tiny batch compiler" may help to solve OP's request. Even if he could give the compiler to end users to compile the code after the installing modifications was made, they still could see the Batch source code before the modifications, isn't it?

On the other hand, my program is a complete solution for OP's request that give a certain protection that should be enough for casual users. Well, this would work as long as they don't see your recipe to break the code!

Antonio

[carlos]

My tiny batch compiler, it uses a technique never used before, and it can really help.
I updating and reviewing the code of it for publish it as a commercial software, available for download with a donation.
I don't have many free time, then I think that can done it in a month.
The algorithm is clear in my mind, but I spend time in write optimized and tested code.