[otbn, sca] optimized some parameters to speed things up

Signed-off-by: Michael Tempelmeier <[email protected]>

cw/capture.py

@@ -1008,7 +1008,7 @@ def capture_ecdsa_secret_keygen(ot, ktp, fw_bin, pll_frequency, capture_cfg):
  """
  # Currently, we need to reprogram the firmware before every sign operation
  # TODO: Investigate if this is needed.
- reset_firmware = True
+ reset_firmware = False
 
  # OTBN operations are long. CW-Husky can store only 131070 samples
  # in the non-stream mode. In case we want to collect more samples,
@@ -1069,7 +1069,7 @@ def capture_ecdsa_secret_keygen(ot, ktp, fw_bin, pll_frequency, capture_cfg):
 
  # Generate a new random mask for each trace.
  mask = ktp.next_text()
- print(f'mask = {mask.hex()}')
+ tqdm.write(f'mask = {mask.hex()}')
 
  # Loop to collect each section of the power trace
  for ii in range(num_sections):
@@ -1097,13 +1097,13 @@ def capture_ecdsa_secret_keygen(ot, ktp, fw_bin, pll_frequency, capture_cfg):
  ret = ot.scope.capture(poll_done=True)
  # If getting inconsistent results (e.g. variable number of cycles),
  # adding a sufficient sleep below here appears to fix things
- time.sleep(1)
+ #time.sleep(1) # we cannot afford 1 second per run.
  if ret:
  raise RuntimeError('Timeout during capture')
 
  # Check the number of cycles where the trigger signal was high.
  cycles = ot.scope.adc.trig_count
- print("Observed number of cycles: %d" % cycles)
+ tqdm.write("Observed number of cycles: %d" % cycles)
 
  # Append the section into the waves array
  waves = np.append(waves, ot.scope.get_last_trace(as_int=True))

cw/capture_ecdsa_skgen_cw310.yaml

@@ -15,12 +15,14 @@ capture:
  # Output length (most likely unused).
  output_len_bytes: 40
  # Samples per trace
- num_samples: 262140
+ # num_samples: 262140
+ # Fifo Size is 131070
+ num_samples: 131070 # max num samples to avoid multiple runs per trace
  # Offset in samples
  offset: 0
  # scope gain in db - 13 for non-stream mode, 32.5 for stream mode
  scope_gain: 32.5
- num_traces: 1
+ num_traces: 100
  project_name: projects/opentitan_ecdsa_keygen
  waverunner_ip: 192.168.1.228
  # As OTBN operations are long, we may need to overwrite the following