Continuous isochronous read access and measurement of data stored in non-volatile memory

An interface to authenticate nonvolatile stored data comprising:

• an engine in a nonvolatile memory arranged to continuously measure data read from the nonvolatile memory and compute an original hash value on the data read from the nonvolatile memory;
• and
• an engine in the processor arranged to receive the data and the original hash value transferred via the interface and compute a recomputed hash value on the received data that is compared to the original hash value computed by the engine in a nonvolatile memory
• wherein the original hash value and the recomputed hash value are computed isochronously and continuously by delivering time-dependent data within defined time constraints to ensure synchronization with other time-dependent information in the processor.

A method comprising:

• invoking a command to a first engine in a nonvolatile memory to initiate a new interval of isochronous and continuous measurement on an unprotected memory range;
• causing the first engine in the nonvolatile memory to generate a first hash-based Message Authentication Code (HMAC) value for the unprotected memory range in the nonvolatile memory that is transferred over an interface to a host processor, the first HMAC value generated with the new interval;
• causing a second engine in the host processor to generate a second HMAC value, the second engine to generate the second HMAC value using stored reference digests;
• delivering time-dependent data within defined time constraints to ensure synchronization with other time-dependent information in the processor based on the com s arison of the second HMAC value with the first HMAC value.