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How to check if a package decrypted correctly?

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Hey all,

I'm writing a game PKG extractor/viewer for Mac OS, there's none out AFAIK and it was a decent challenge over Xmas.

So I have got the loading, parsed the size and offset of the encrypted content, got the key at 0x70 and ran a lightly-modified version of Failoverflow's aes128ctr method to decrypt the package.

But I don't have a <3.55 PS3, and have little knowledge of how to check if the package has successfully decrypted or not.

Thanks for any suggestions! :)

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