failed in compiling DFU Secure Bootloader with uECC

RE: failed in compiling DFU Secure Bootloader with uECC

Jørgen Holmefjord — Tue, 20 Jul 2021 13:01:16 GMT

Hi,

uECC is supported for Secure DFU examples. It is one of the supported backends for performing the ECC cryptographic operations required by the solution. Before SDK 15, uECC was the preferred solution for this, but required additional SW backend for performing SHA256/Hash operations. From SDK 15.0.0, we also added nRF_Oberon backend to the nrf_crypto libraries. This Oberon backend supports ECC, but it also supports Hash/SHA256. If you stick with Oberon, you will only need a single backend, while if going for uECC, you will require one additional backend for SHA256 (either SW, Oberon, or mbedTLS).

Best regards,
Jørgen

RE: failed in compiling DFU Secure Bootloader with uECC

StefXinet — Tue, 13 Jul 2021 07:16:11 GMT

Dear Jørgen,

so the Secure DFU example doesn't support ECC. Could you explain me why I should include uECC library it and compile separately \external\micro-ecc\nrf52nf_keil\armgcc\micro_ecc_lib_nrf52.lib ?

Why I need uECC if your bootloader does not support it? There iis something not clear in the tutorials...

I read the following tutorials:

BLE Secure DFU Bootloader
micro_ecc backend
Working with keys

Thanks for help

RE: failed in compiling DFU Secure Bootloader with uECC

Jørgen Holmefjord — Mon, 12 Jul 2021 15:30:13 GMT

Hi,

The DFU/Bootloader solution uses Hash/SHA256-functions to verify the integrity of the received DFU image. You need to enable another backend that supports Hash, as this is not supported in µECC (which only supports ECC).

Best regards,
Jørgen