Hi @Chandler_L
The MPC5606 does not include a security module. S32K1 devices feature the CSEc module, which is implemented according to the SHE specification; therefore, GCM mode is not supported.
The only option is to use software libraries such as wolfSSL, Mbed TLS, or other similar solutions. These libraries are not our products, so please refer to their official resources online for more information.
Regards,
Lukas