Suggested types of references (manufacturer service manuals, locksmith trade publications, academic papers on automotive immobiliser security, relevant standards). (No direct links provided.)
To proceed with security-sensitive tasks, you must enter a corresponding —a response generated by a specific security algorithm—to prove you have "permission" to access the system. How to Use an Incode Calculator ford+mazda+outcode+incode+calculator+english
There is no "universal" calculator. You must know which algorithm your car uses: locksmith trade publications