[capture] Change PRNG for on-device test data generation (TVLA)

lowRISC / ot-sca

Side-channel analysis setup for OpenTitan

Apache License 2.0

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[capture] Change PRNG for on-device test data generation (TVLA) #199

Open johannheyszl opened 10 months ago

johannheyszl commented 10 months ago

We currently use Python random host-side and an implementation of the same Mersenne twister on device side.

There is a danger of the Python class changing.
This is not precisely in line with the definition of TVLA.
Using something like AES to generate random data is very straightforward / comprehensible.

We could replace it by a SW implementation of AES to generate the data on-device.

vrozic commented 10 months ago

OT PR #20238 partially addressed this issue. It adds AES SW implementation and changes the batch-capture commands to use AES generated data as defined in TVLA Derived Test Requirements.

After merging this, my plan to update the binaries and modify the capture scripts.

m-temp commented 9 months ago

The kmac script also depends on the random function.