Intel® FPGA PACs have a laddering key mechanism that allows for cancellation of code signing keys. This method returns the integer key ID of the specified key. The root key ID must be the constant 0xFFFFFFFF. Root keys cannot be canceled.
Intel® PAC with Intel® Arria® 10 GX FPGA AFU code signing key IDs must be in the range 0 to 127 (7-bit unsigned).