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Secure swap with scratch on external flash #1

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pennam opened this issue Mar 25, 2022 · 0 comments
Open

Secure swap with scratch on external flash #1

pennam opened this issue Mar 25, 2022 · 0 comments
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pennam commented Mar 25, 2022 •
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By default MCUboot decrypts data coming from SLOT 1 before writing it into SCRATCH area. This is done becuase not the whole SLOT is encrypted and the offset are stored into SLOT 1 header.

Since SCRATCH does not have an header to store the offsets the idea is to not change the default behaviour of MCUboot and let decrypt the data while reading from SLOT 1 and then add an extra encryption step using the same key used to encrypt SLOT 1 to re-encrypt all the data (not considering offsets) before writing it into SCRATCH.

The data needs also to be decrypted when is readed from scratch.

A possible implementation can be: arduino/mcuboot@6729d8d
@pennam pennam self-assigned this Mar 25, 2022
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