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PROCESSOR-SDK-AM62X: How to use custMpk.key to encrypt binary files in Linux_SDK?

Part Number: PROCESSOR-SDK-AM62X

Tool/software:

Regarding the above flowchart, there is the relevant implementation logic process in MCU_SDK, just set ENC_ENABLED to "yes". But in the LINUX_SDK in uboot/board/ti/keys file below custMpk. CRT, custMpk. Key, custMpk. Pem; So far we have only used custMpk.pem to sign a binary, how can we use custMpk.key to encrypt a binary? Does custMpk.crt play a role in building uboot? Even if uboot/board/ti/keys only have custMpk.pem and ti-degrade-key.pem, uboot can still be built