Automotive Seed-Key Algorithm Reverse-Engineering

My goal is to understand and reproduce its seed-key security algorithm so I can calculate valid keys locally without querying the vehicle. Its a Motorola MPC55x-based ECU from year 2004-2010, which have some commons with the SAEJ1939 protocol... (Budget: €250 - €750 EUR, Jobs: Algorithm, Algorithm Analysis, Automotive, Automotive Engineering, C Programming, C++ Programming, Embedded Systems, Python, Reverse Engineering)