Questions about Symmetric Key and CRC Support in MCUboot

[RonakHarsora]

I have a few questions regarding image authentication in MCUboot:

1. CMAC Implementation

   • Is there an example of implementing CMAC-based image authentication in MCUboot?
   • Are there any existing symmetric key algorithm implementations that could be referenced?

2. CRC as an Alternative

   • Is it possible to use CRC instead of SHA for image integrity?
   • Are there any considerations or limitations when using CRC instead of cryptographic hashes?
   • Has anyone implemented CRC-based verification in MCUboot?

3. Current Support

   • What symmetric key algorithms are currently supported?
   • Is there documentation or examples showing symmetric key usage?

My use case requires simpler integrity checks and symmetric key operations instead of asymmetric cryptography. Any guidance or examples would be helpful.

Thanks!

[nordicjm]

AES is used for image encryption/decompression, the signature uses asymmetric keys. AES-128 is supported, AES-256 is also supported. CRC is not supported, the upgrade system is based around sha256 (or sha512)

[RonakHarsora]

what if we only want to support the MAC protection. No encryption ? MCUBoot does not allows that I guess>