regarding a storing a data in nv memory of tpm , without using authorisation or key storing techniques. #1

[manojsai17]

Hello,

actually main problem is we interfaced slb 9670(tpm-2.0) with 16 bit msp430 controller which does not support linux kernel or any OS.

now our task is to store a 100 byes of data in NV memory, without any authorisation technique, as simple as possible.

please guide me in that way.

slb 9670 is interfaced with msp430 controller through SPI protocol.

I able to read device id , version id of slb9670 , so spi communication is working fine with our controller .

what is packet format to be send with our data , i am not able to understand the TCG documents .

theoretically iam able to understand we have to do nvdefinespace , nvwrite ,nvread .. internaly what is the format i have to be send not able to understand

can you please guide me , or share any code snippet .

sorry if i trouble you or any irrelevant questions.

Regards,
Manoj,
mail : [email protected]
+91-9063249308

[nabilschear]

like you, i struggle understanding the TCG docs. this IBM code does properly format the I/O messages to the TPM. See https://github.com/mit-ll/tpm4720-keylime/blob/master/libtpm/lib/nv.c#L125 for an example for nv define space. Unfortunately, to use the NVRAM you'll probably also need to look at some of the basic TPM initialization methods and run those first.