4.1 General Device Commands
The following table provides a summary of the 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 |