[Hashlet-users] HMAC Issue created

[Josh Datko]

On the HMAC branch, Issue 25: https://github.com/cryptotronix/hashlet/issues/25

I have the CLI infrastructure there so you see the options in the issue on how to run.

The unimplemented functions are here: https://github.com/cryptotronix/hashlet/blob/faf3ed754f88df07111e87c005421a8370a3ce96/src/driver/command.c#L1249-L1268

The example command buildup is here: https://github.com/cryptotronix/hashlet/blob/faf3ed754f88df07111e87c005421a8370a3ce96/src/driver/command.c#L739-L758

Note, this command HMACs what is in tempkey, so you don't send it any additional data.

Per page 51 of the datasheet, HMAC is calculated over:

The HMAC digest is computed using the key at SlotID as the HMAC key over a message consisting of the following 

information:

32 bytes Zeros

32 bytes TempKey 

1 byte Opcode (always 0x11)

1 byte Mode

2 bytes SlotID

8 bytes OTP[0:7] or zeros (see Table 8-21)

3 bytes OTP[8:10] or zeros (see Table 8-21)

1 byte SN[8] 

4 bytes SN[4:7] or zeros (see Table 8-21)

2 bytes SN[0:1] 

2 bytes SN[2:3] or zeros (see Table 8-21)

You can retrieve the serial num with the CLI command "serial-num" and the OTP zone is dumped with the -v option if you don't supply a file to HMAC.

Thank You!