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R&S RTB2004 Snooping

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tv84:

--- Quote from: KaneTW on October 16, 2020, 04:38:32 pm ---How did you decrypt the FWU? I tried with the AES key posted in this thread, but it failed.

--- End quote ---

It's AES-256, not AES-128. You have to consider the 32 bytes of the key.

KaneTW:
Oh. I didn't realize it was 0-padded 256-bit AES. It even worked the last time round, I just didn't notice that it succeeded. Oops.

E: welp, didn't work. just didn't fail, but the data's still encrypted. hmm.

ElectronMan:
Make sure you're using AES-256CBC with an IV of 0. Openssl can be used.

abyrvalg:
If all you want from decrypted FWU is to get the main part for study - just find the ELF header signature (7F "ELF") and rip from there till end of file, you'll get a correct ELF.

KaneTW:
Using this:

--- Code: --- openssl aes-256-cbc -K 43C6B3E57510A3C5547AA4DF9528B783  -iv 0 -in RTB2004.FWU -out RTB2004.FWU.dec
--- End code ---

Resulting .dec file is either compressed or encrypted (bytes are uniformly distributed)

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