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mpetroff/configuration-file-decoder.py

Created August 28, 2016 17:35
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Ricoh Theta desktop application configuration file decoder
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configuration-file-decoder.py
#!/usr/bin/env python
'''
Decodes encrypted configuration file for Ricoh Theta desktop application.
I'm not sure what the point of double AES encryption is when the key is
embedded right in the executable.
Requires pycryto
Matthew Petroff <https://mpetroff.net/>, 2016
'''
import base64
import string
from Crypto.Cipher import AES
with open('CommonConfig.dat') as f:
to_decode = f.read()
to_decode = base64.b64decode(to_decode)
cipher0 = [201, 45, 6, 30, 24, 70, 78, 155, 134, 116, 25, 23, 119, 211, 42, 47,
207, 9, 7, 54, 210, 41, 77, 143, 161, 48, 119, 190, 117, 217, 28, 234]
cipher_str0 = string.join([chr(c) for c in cipher0], '')
iv_str0 = string.join([chr(i) for i in range(16)], '')
obj0 = AES.new(key=cipher_str0, mode=AES.MODE_CBC, IV=iv_str0)
decrypted0 = obj0.decrypt(to_decode)
cipher_str1 = decrypted0[:32]
obj1 = AES.new(key=cipher_str1, mode=AES.MODE_CBC, IV=iv_str0)
decrypted1 = obj1.decrypt(decrypted0[32:])
with open('decoded_config.xml', 'w') as f:
f.write(decrypted1)
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