What is the use of Crunch command in AES132.
I was just going through all commands. Found this command.
Read its detail in datasheet. Not much details given about it anywhere.
Couldn't able to comprehend the purpose of this command?
In which application scenario this command will be useful?
Datasheet says: 0x0B => Processes a seed value through the internal crunch engine. This function is used to detect clones.
The Crunch command processes a seed value and returns the result within a specified time. The command
provides a 16-byte input seed, which is combined with the ManufacturingID Register and processed with the
internal hardware crunch calculator. The calculation is performed within a specified time period.
The Host system should read the response within a few milliseconds after the response is specified to be
available and compare the returned value to the expected result to determine if authentic Atmel hardware is
present. The crunch algorithm is proprietary, and is available only in authentic Atmel hardware.
The Crunch command does not use the AES engine or the Nonce. Executing the Crunch command does not
change the authentication status or cryptographic state of the device.
"> The response to the Crunch command is available after a period of time that is dependent on the Count field
value. A large Count value requires more time to process than a small Count value. The expected response time
for the Crunch command is computed using the following equation:
((count × 256) + 600)) × 1.25 microseconds