SWCU193A April 2023 – August 2024 CC2340R2 , CC2340R5 , CC2340R5-Q1
CCM can be realized using 16 + 2(Nonce + Packet and Payload header) blocks of CBC-MAC to calculate authentication block and 16 + 1(Authentication Tag) blocks of CTR to perform encryption/decryption. CTR uses the same 16 blocks of plaintext as CBC-MAC.