[TF-M] Pre-encryption image compression

Hello All,

Does the current TF-M version support image compression before image is encrypted?

Needless to say, compression after the image has been encrypted would not yield reasonable compression ratio.

I am showing that *.bin files, even built with MinSizeRel option, zip-compress with minimum 50% compression ratio so probably this would make sense. Tested with STM32U5 target and GCC.

"PSA Certified Firmware Update API https://arm-software.github.io/psa-api/fwu/1.0/overview/architecture.html#m anifest " document in sections 3.1 and 3.2 provides for image compression.

Kind regards,

Tomasz Jastrzębski