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Steal this Code
Decompiling SWFs for fun and profit
Doug McCune
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Who am I?
•
Flex developer
•
Blogger: dougmccune.com
•
Author: Adobe Flex 3.0 for Dummies
•
Principal Software Engineer @
doug@dougmccune.com
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What am I going to talk about?
•
What’s in a SWF?
•
Decompiling tools
•
Example: decompiling Photoshop Express 
•
What you get, what you don’t
•
Example: fucking with Natzke
•
Was that made with ______?
•
Security implications
•
Example: implementing the Photoshop Express filters
•
Obfuscation and Encryption
•
The moral lesson
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What’s a SWF?
•
ActionScript Byte Code (ABC)
•
Embedded graphical assets (swf, png, etc)
•
Shapes drawn in Flash Authoring
•
Frames, timeline nonsense, and the rest of 
the weird stuff you designers like
For more than you ever wanted to know about SWF files:
http://www.adobe.com/devnet/swf/
http://www.adobe.com/devnet/swf/pdf/swf_file_format_spec_v9.pdf
http://www.adobe.com/devnet/actionscript/articles/avm2overview.pdf
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What’s a SWF?
•
ActionScript Byte Code (ABC)
•
Embedded graphical assets (swf, png, etc)
•
Shapes drawn in Flash Authoring
•
Frames, timeline nonsense, and the rest of 
the weird stuff you designers like
For more than you ever wanted to know about SWF files:
http://www.adobe.com/devnet/swf/
http://www.adobe.com/devnet/swf/pdf/swf_file_format_spec_v9.pdf
http://www.adobe.com/devnet/actionscript/articles/avm2overview.pdf
I don’t care
the good stuff
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Decompiling Tools
•
Sothink SWF Decompiler
•
$80, Mac or PC, works great
•
Nemo 440
•
free AIR app, generates ABC bytecode
•
swfdump
•
free, included in Flex SDK, dumps ABC bytecode
•
abcdump.as
•
free, part of the Tamarin project
•
ActionScript Viewer (ASV)
•
$80 only AS3 support in “prerelease” version, PC only
How easy is it?
Let’s decompile Photoshop Express 
in a few seconds
But there’s a catch
while (_loc_8 <= 30)
{
_loc_9 = 1;
_loc_10 = tTable[_loc_8];
_loc_11 = Math.sqrt(1 + _loc_10 * _loc_10);
_loc_9 = _loc_9 / _loc_11;
_loc_10 = _loc_10 / _loc_11;
_loc_12 = _loc_3 - uTable[_loc_8];
_loc_13 = _loc_4 - vTable[_loc_8];
_loc_14 = (-_loc_12) * _loc_10 + _loc_13 * _loc_9;
* actual code from Photoshop Express
What you get and what 
you don’t
You get:
•
package structure
•
class names
•
method names and signatures
•
class-level variable names
You don’t get:
•
most local variable names
•
method parameter names
•
for loops (turn into while loops)
•
sometimes initial variable assignments
Comparing ActionScript, ABC 
bytecode, and decompiled source
Example ActionScript function:
public function mySuperSecretSauce(input:String):String {
var size:Number = input.length;
for(var i:Number = 0; i < size; i++)
{
if(input.charCodeAt(i) > 32)
{
return input.substring(i);
}
}
 
 
 
return "";
}
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