2.3.2 HMAC Command

While the HMAC command no longer exists for the ATECC608B, the HMAC calculation can still be performed. The ATECC608B provides the feature for calculating the HMAC value using the SHA command. For both ATECC608B and ATECC508A, the resulting HMAC value from using the SHA command always matches. However, the ATECC608B HMAC value calculated using the SHA command does not match the HMAC value calculated using the HMAC command in the ATECC508A.