RT1020: ctr_nonce calculation algorithm, when is applied?

[mastupristi]

Hello,

I usually compute the ctr_nonce for BEE taking the nonce[127-32], and in the LSW I put address r-shifted by 4.

This is confirmed by documents:

and also by code provided by SDK examples:

I usually use SW key or SW_GP2 key, and this simple algorithm make BEE works well.

However, I found another algorithm, significantly more complex:

I wonder when this algorithm is used by BEE, and I would like more details on how H7 and H8 are used, because it is not clear from the drawing.

best regards

Max

[Sam_Gao · Accepted solution]

’However, I found another algorithm, significantly more complex....‘

@mastupristi What is your purpose? Please tell me the source of this screenshot, NXP's publicly available information has listed what can be disclosed.