General Device Commands

The following table provides a summary of the general device commands:

Table 1. General Device Commands
Command Name	Description
`Counter`	Increments and reads the monotonic counters
`Info`	Used to read revision and status information from the device
`Lock`	Used to lock the individual lockable slots in the device
`Nonce`	Used to generate or pass a number used once into the device
`Random`	Used to generate a 32-byte random number used by the system
`Read`	Used to read various zones of the device
`SelfTest`	Tests the various internal cryptographic computation elements
`SHA`	Computes a SHA-256 or HMAC digest for general purpose use by the system
`UpdateExtra`	Updates bytes 84 or 85 within the Configuration zone after the Configuration zone is locked
`Write`	Used to write 4 or 32 bytes to the device, with or without authentication and encryption