Compute/Verify truncated MAC using AES-128 CMAC calculation with PSA API

[GeneralPurpose]

Hi,

I fiddled around with examples using the PSA API to compute a MAC by AES-128 CMAC. That worked out fine. I can import a key, use it to compute the mac over a message and verify it in my example. The MAC created is 16 bytes long. Now I looked around how to handle a truncated MAC of 5 byte, but found no hints in the PSA API, how to handle them.

Can anyone point me into the right direction?

Thank's allot

Stephan

[SwRa]

Hi Stephen,

I believe you can use this: https://arm-software.github.io/psa-api/crypto/1.2/api/ops/macs.html#c.PSA_ALG_TRUNCATED_MAC 

Regards,

Swathy