A generic pseudo-code representation of a GM-style algorithm might look like this:
If you capture a single valid seed/key pair over CAN, you can solve for the affine constants if the algorithm structure is known, then generate valid keys for any future seed. This is why GM later moved to 7-byte and eventually PKI (public key) in Global C platforms. gm 5 byte seed key
If you are looking to research or purchase tools for this purpose, consider the following options: Please I want to know how to programme a car ECU - Facebook A generic pseudo-code representation of a GM-style algorithm
temp[i] = Seed[i] ^ table[Seed[(i+1)%5]] Key[i] = (temp[i] * 0x23 + 0x17) & 0xFF The widespread availability of GM 5 byte key
Tools like DPS (Development Programming System) , Tefecu , and dedicated GM Seed Key Calculators are designed to automate this handshake for technicians.
The widespread availability of GM 5 byte key calculators raises ethical questions. While locksmiths and salvage yards use them to repair totaled vehicles (e.g., replacing an ECU from a junkyard requires unlocking it to re-pair the immobilizer), thieves can theoretically use the same tools to bypass the ignition.
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