Got bored. Generates an encTitleKey.bin that works with the TitleKey decryptor, use the titlekey tools to dump the key, ctrtool to extract the contents and then the command "aescbc content content.out key 00000000000000000000000000000000" (that's 32 zeroes) (minus quotes) replacing "content" with the extracted and encrypted content and "key" with the key printed out by printKeys.py.
Or, you could just drop the CIA onto dumpTicketKeys.py, it searches for tickets in whatever you give it. And once you have the decrypted key, you can just uses ctrtool to decrypt the CIA, you don't need aescbc.
Code:
ctrtool --titlekey=XXX --contents=blah file.cia













