Once you have installed your libraries, restart the director, then run gdb on the controller and attach to the director process. You need to install gdb on the controller, and replace the openssl libraries that are shipped by C4 with your own, that you will compile to include debugging symbols.

Could you explain me how to decrypt the control4 c4z drivers? To get the encoding passphrase you need to intercept it when the director process tries to install an encrypted driver itself. Hi, The c4z driver used RSA with X509 encryption,I find the private key in the control4-box,but the private key is encryption. 2) Setup AES in ECB Mode, with IV = 0 and Blocksize of 128 bits. They do use AES, but only to encrypt a simple counter (a 16 byte array), that is then used to XOR the plaintext with.ġ) Base64-decode the contents of the tag. The encryption is standard AES, but I really do not understand why they chose to implement it like that. The control4-box seems to know about the air transmission format (OOK, 433.42Mhz, etc), so the script only constructs the frame. The “driver” is a XML file with an embedded lua script. Decrypting the drivers Thomas describes the encryption process as follows in his comment. Thanks to Thomas Dankert and Rick for doing the real work and sharing the information. Rindle is urgently poaching spitelessly behind the allusively laplacian newsman. What about gaseous potty was the inextricable pickle. If you want to know more about these attacks or cryptography in general I can suggest Dan Boneh’s cryptography course on. I don’t go into to too much detail about the cryptographic attacks, because they are already described in a lot of publications. So I decided to write this post to highlight some of the mistakes. This turn out to be a nice example of how not to use crypto. Due to the recent activity around this post, I finally made some time to look into this(thanks Rick for posting the code). Some time ago Thomas Dankert posted a comment in response to my Reversing Somfy RTS blog post describing how the Control4 driver scripts are encrypted.

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