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Fibble, posted Wed Oct 16, 2019 3:35 pm (51566)

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So I got a little problem with decryption a XXTEA encrypted zip file (cocos2d-lua).
I do know the key and the sign but i cant get ANY XXTEA decryption to work for me.

Decryption key (used by the game) is:

Code:

wW4Dm]fu%kGK}2nG

The Sign is:

Code:

MB-.Z'F*fNJz[9Rr 

I simply cant decrypt the file :c (and encrypt it back!)

Fibble, posted Wed Oct 16, 2019 3:36 pm (51567)

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The game name itself is

Quote:

Trials of Heroes

atom0s, posted Thu Oct 17, 2019 12:27 am (51576)

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Where are you pulling the decryption key from? It's not stored in the .so files from the look of it and not in the .dex either.

Fibble, posted Thu Oct 17, 2019 3:23 pm (51586)

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I decompiled and debugged the game in IDA ( - Breakpoints to get the key).
I do also have the decrypted *.zip file. Just need to acutally overwrite the encrypted one :/

atom0s, posted Fri Oct 18, 2019 3:47 am (51595)

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Fibble wrote:

I decompiled and debugged the game in IDA ( - Breakpoints to get the key).
I do also have the decrypted *.zip file. Just need to acutally overwrite the encrypted one :/

New to Android debugging personally, do you have a specific guide/site you used to get things setup and working for this? Everything I've tried so far doesn't seem to work, and refuses to let me debug.

Ekey, posted Fri Oct 18, 2019 11:48 am (51600)

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Did you try it ? > https://www.hex-rays.com/products/ida/s ... dalvik.pdf

atom0s, posted Fri Oct 18, 2019 8:01 pm (51603)

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Ekey wrote:

Did you try it ? > https://www.hex-rays.com/products/ida/s ... dalvik.pdf

Yea, I can't even install apps to the emulator. Just fails/errors every time. Also, I can't install IDA's server on my actual phone either since it's not rooted.

atom0s, posted Fri Oct 18, 2019 8:39 pm (51605)

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Actually think I just noticed why. Didn't realize the default emulators AVDs are using x86. The apps I was testing with were expecting arm64-v8a or armeabi-v7a. Downloading the other system stuff and redoing the AVDs and will see if that fixes the emulator problems. Hopefully, IDA's remote server stuff will run on the emulators as well.

aluigi, posted Sat Oct 19, 2019 1:58 pm (51618)

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Tried many combos of xxtea and xtea but all the results are a failure.
Quite normal since there are different settings of xxtea so can't do anything without the right parameters

Fibble, posted Mon Oct 21, 2019 4:29 am (51653)

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aluigi wrote:

Tried many combos of xxtea and xtea but all the results are a failure.
Quite normal since there are different settings of xxtea so can't do anything without the right parameters

Well kinda guessed that :/
Thanks anyways for the try aluigi

rai88kau, posted Thu Apr 02, 2020 4:20 am (55458)

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Fibble wrote:

I decompiled and debugged the game in IDA ( - Breakpoints to get the key).
I do also have the decrypted *.zip file. Just need to acutally overwrite the encrypted one :/

can you tell me, how to did this?
thank you so much