Microprogrammed control unit (MCU) upgrading method based on national cryptographic algorithm

The invention relates to the technical field of vehicle-mounted electronics, in particular to an MCU (Microprogrammed Control Unit) upgrading method based on a national cryptographic algorithm, which comprises the following steps that: a background encrypts resources in an MCU chip; obtaining current software version information of the domain control internal equipment; making an upgrading request to the SOC chip by a background; the SOC chip obtains a software version in the MCU chip by establishing https communication connection with a server; the SOC chip performs signature verification and decryption on the obtained software version in the MCU chip; and the SOC chip sends the data subjected to signature verification to the MCU chip, and upgrading is completed. The vehicle-mounted software upgrading method has the beneficial effects that the data network is transmitted to the SOC, the operations of encryption, decryption, signature verification, authentication and the like in the whole transmission and dat