topic Re: Using DCP while running Encrypted XIP with BEE in i.MX RT Crossover MCUs

Using DCP while running Encrypted XIP with BEE

natebowen — Sat, 12 Feb 2022 21:09:17 GMT

I currently have a non-encrypted second-stage bootloader that sets up the BEE peripheral with a register-based AES key. This is based on the driver example in SDK 2.11.0. Once the bootloader has set up the BEE, I jump to my AES-CTR encrypted application code. This process works fine.

However, when I attempt to use the DCP in the application code (also based on the driver example from SDK 2.11.0) to perform AES encryption or decryption with an SRAM-based key, my encrypted data is returned as [0x00, 0x00, ...].

If I don't enable the BEE in the bootloader and jump to a non-encrypted version of my application code, the DCP functions as expected.

Is there any reason why the DCP should behave differently if the BEE is running? I have a copy of the RT106XSRM Rev 0, and the DCP and BEE chapters make no mention of each other. Note that I'm not using SW_GP2, here.

Re: Using DCP while running Encrypted XIP with BEE

natebowen — Sat, 12 Feb 2022 21:22:00 GMT

@damonbI saw you were using the BEE capabilities in your post here. Have you used DCP in your encrypted application code?

Re: Using DCP while running Encrypted XIP with BEE

jeremyzhou — Mon, 14 Feb 2022 02:41:24 GMT

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
It seems a bit weird, the DCP should be independent with the BEE, so to be prudent, I was wondering if you can list the steps of testing, as I'd like to replicate the phenomenon you encountered.
Looking forward to your reply.
Have a great day,
TIC

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Re: Using DCP while running Encrypted XIP with BEE

damonb — Mon, 14 Feb 2022 10:35:37 GMT

I'm afraid I'm not using DCP in the application code