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Updated docs.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
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Pol Henarejos
2022-06-05 20:40:41 +02:00
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doc/extra_command.md
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@@ -83,4 +83,9 @@ Sending: 80 64 06 00 01 00
Received (SW1=0x90, SW2=0x00)
```
### Key usage counter by default
Pico HSM supports a key usage counter to audit the usage of a particular key. For every operation with the key, the counter is reduced by 1. When it reaches 0, the key is disabled and cannot be used.
This option is disabled by default. When enabled, each generated key in the device is attached to a counter, starting at `2^32-1` (`FFFFFFFEh`). Therefore, it allows to count how many times a key is used for signing or decryption.
The counter can be viewed by using the SCS3 tool. More info at [doc/scs3.md](/doc/scs3.md).