For KM34 board can we do on the fly AES decryption?

Bhumika — Tue, 25 Jun 2024 12:03:21 GMT

For KM34 we have internal flash and i want to update my encrypted firmware through bootloader, can we decrypt the firmware using MMCAU and then flash to controller using bootloader to execute the code.

Can i get steps to provide security to firmware using MMCAU.

Re: For KM34 board can we do on the fly AES decryption?

xiangjun_rong — Wed, 26 Jun 2024 02:44:18 GMT

Hi,

It is impossible to encrypt the firmware using MMCAU and and decrypt the firmware on the fly, at the same time execute it.

If you want to on the fly decrypt /execute the firmware, you have to consider the K8x or LPC546xx.

For the KM34, the on-chip flash provides the protection by writing the Flash Configuration Field

For detailed inf, pls refer to section 27.3.1 Flash Configuration Field Description in the RM of KM34.

After the flash is in security mode, the JTAG port is blocked, user can not access the code in flash via JTAG.

Hope it can help you

XiangJun Rong

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For KM34 board can we do on the fly AES decryption?

Re: For KM34 board can we do on the fly AES decryption?