CC3235MODSF: Flash encrypt

Lemon Wang

Part Number: CC3235MODSF
Other Parts Discussed in Thread: UNIFLASH

Hi TI engineer

I want to encrypted flash to prevent the firmware from being read and modified.

According swru469 section 6.7, need create a key. Can this key be set arbitrarily?

Program image and key by UniFlash .Is it possible to implement the function?

0 Kobi Leibovitch over 2 years ago

See 6.7.1 in CC32xx uniflash guide for detailed on the encryption key.

The key encrypts the programming image and requires activation (with the same) key once programming the device.

The file system (which is extracted from the programming image by the bootloader) support secure (encrypted) files, based on PKI.

0 Lemon Wang over 2 years ago in reply to Kobi Leibovitch

Thanks reply!

Whether the activation is performed automatically by CC3235? Is there a detailed description of the function here？

And i don't want use same key, can create random key by CC3235 internal?

0 Kobi Leibovitch over 2 years ago in reply to Lemon Wang

Only symmetric key can be used for the encryption of the programming image.

The provided user key is assembled with device specific key to create the encryption (AES) key.

Please find more details about the process in chapter 8.12 of the NWP Programming Guide

0 Lemon Wang over 2 years ago in reply to Kobi Leibovitch

Thanks reply!

I want to verify this functionality， How to verify that this feature works ?

0 Kobi Leibovitch over 2 years ago in reply to Lemon Wang

create a secure image (eg with uniflash) and then program it with and without the key.

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