SHA512 digest/checksum of iOS App Executable doesn't match

Hi,
I'm developing an iPhone application, where i am checking the integrity of App Bundle files content at run time. To do this we first calculate the Checksum of files inside Bundle during Xcode build( by running custom script after build get completed).
When app is loaded onto the device we calculate the Checksum of each files again programmatically and compare the same with the one which is created at the time of Build.
My Checksum matches for all files inside the Bundle successfully except the iOS App Executable file??
Is the App Executable binary inside Bundle encrypted ? If yes, can we calculate the Checksum of Executable?
please clarify..
Thanks,

The answer to this question was provided by a user on StackOverflow.
We got burned by some issues w/StageText when it first came out, I don't know if they have been addressed. A quick test (change the skin class to spark.skins.mobile.TextInputSkin) can tell if this is the case.

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