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3 EEPROM Memory and Data Zone Access Policies
3.2 Data Zone and Access Policies
3.2.1 Data Zone Data Types
The following section provides more details on the various types of data capable of being stored in the ECC608-TFLXWPC data slots.
3.2.1.4 WPC Slot Digests

3.2.1.4 WPC Slot Digests

As an alternative to doing a full authentication using certificates, the WPC authentication specification allows for a rapid authentication to be done by simply comparing the digest associated with WPC Slot 0 or WPC Slot 1, if so defined. For this method to be used, a full authentication must be previously done and the digest of the WPC Slot must be calculated and stored.

The digest value is a 32-byte value calculated as a SHA-256 hash over the entire WPC Slot. The specification allows for a digest for each of the defined WPC certificate slot. The ECC608-TFLXWPC has storage for two digests. Device Slot 3 is used for WPC Slot 0. WPC Slot 1 digest is stored in Slot 8[288:319].

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