Tivo App - Debugger Checks

I have accepted I will never be able to take the TiVo Stream's whiteboxkey and the TivoCrypt and calculate the actual decryption key for a stream, but maybe I can simply reuse the white-box library to use the iPod Touch as a "calculation server" of sorts?

Using GDB to capture Key

Before I try to make a key calculation server, I need to find a way to make the program spit out the key.  I fired up my GDB in a remote terminal and attached to the "Quicksilver" application.  I followed the app along but everytime it started streaming the application would crash with a memory overflow or other random error.

I recalled seeing some code earlier involving "_getpid" and "_sysctl", I thought it was strange that the application would be getting a process ID of another process.  Doing some research I found out that there is a snippet of code that involves both of these commands that is used to determine of the current process is being run in a debugger...

http://www.coredump.gr/articles/ios-anti-debugging-protections-part-2/

This method involves getting the process ID of the running process and then running sysctl on it and looking for the P_TRACED flag set on processInfo.p_flag.

Looking in the code for this type of code, I stumbled upon a fantastic amount of debugger checks in place:

I spent a few hours trying to modify the code to make the P_TRACED flag never be set, but I quickly realized they had some sort of check in place to see if you had modified code in specific locations (probably inside the whitebox).

At this point, I cannot extract the decryption algorithm, I cannot debug, and I cannot override any code in the whitebox.