No more CC310 support in bootloader? (SDK 15.2)

[Olivier]

I am migrating my project from SDK 15.0 to SDK 15.2. I was using CC310 to accelerate crypto in the bootloader.

While builiding the bootloader wit SDK 15.2, I got the error message "The configuration NRF_CRYPTO_BACKEND_CC310_BL_ECC_LITTLE_ENDIAN_ENABLED was removed in SDK 15.1.0. Please see release notes for details on removing this error message." (at line 56 in components/libraries/crypto/backend/cc310_bl/cc310_bl_backend_ecc.c).

As SDK 15.1 has been removed from public, this error is not clear. Can I use NRF_CRYPTO_BACKEND_CC310_ECC_LITTLE_ENDIAN_ENABLED (wihout _BL) for the bootloader or I must fallback on software crypto for the bootloader?

[Einar Thorsrud]

Hi,

The only change related to the NRF_CRYPTO_BACKEND_CC310_BL_ECC_LITTLE_ENDIAN_ENABLED configuration parameter is that the endianness is not configurable in SDK 15.1 or 15.2. You can modify this yourself by comparing <SDK>\components\libraries\crypto\backend\cc310_bl\cc310_bl_backend_ecc.c in SDK 15.0 and 15.2.

The ENDIAN_MEM_COPY macro used in SDK 15.0 is replaced with a normal memcpy. in SDK 15.0 ENDIAN_MEM_COPY  changed the endianness if NRF_CRYPTO_BACKEND_CC310_BL_ECC_LITTLE_ENDIAN_ENABLED was enabled, so that is what you need to update if you want it back in SDK 15.2.