Communication Processor

Hardware

CXR713F120A (Syscon)

CXD9790GG (I/O)

Software

De/Encrypt Communication Processor updates

This is how to decrypt/encrypt Playstation 3 Reference Tool Communication Processor updates. (use this knowledge wisely)

This was achieved by exploiting the communication processor firmware and gaining root privileges on the running Montavista Linux. The key for the CP update packages is located within the toolupdatedec binary located at /usr/local/sony/bin/toolupdatedec

The update packages are just tar.gz packages encrypted using AES256CBC Here is the syntax to decrypt them :

• The first 16 bytes of the package is the IV, the Second 16 bytes is the hash of the decrypted package.

So use this Syntax after skipping the first 32 bytes of the file:

openssl aes-256-cbc -in reftool_cp_xxx.bin -K E8ED2B817207B70C5DF9090507AF2A8982967620D692B92A59231638402DF13F -iv the_first_16_bytes_of_the_file -d > dec.tgz

PSP Hardware Tool Updates use the very same encryption but a different key inside the toolupdatedec binary.

The key to these units has also been dumped, here is the syntax to decrypt psp Hardware Tool Update for DTP-T1000

openssl aes-256-cbc -in psptoolupdate.bin -K A400C48628A7A5294D11AE3BB2587AEA32E501C63E49D1DCAA19B5AEB092F3DB -iv the_first_16_bytes_of_the_file -d > dec.tgz

P.S. If you have any trouble extracting the tarballs, try using Linux.

- Mathieulh

Because a picture is worth a thousand words, here is one:

• 

  Root on the Communication Processor

Proper De/Encrypting of CP Updates

• source code [[1]]