Making Scripts

User scripts allows partial (i.e.: setting up the environment) or total automation of the execution flow.

A basic script would look like this:

import sys from chipwhisperer.common.api.CWCoreAPI import CWCoreAPI # Import the ChipWhisperer API import chipwhisperer.capture.ui.CWCaptureGUI as cwc # Import the ChipWhispererCapture GUI from chipwhisperer.common.scripts.base import UserScriptBase from chipwhisperer.common.utils.parameter import Parameter

class UserScript(UserScriptBase):

   _name = "ChipWhisperer-Lite: AES SimpleSerial on XMEGA"
   _description = "SimpleSerial with Standard Target for AES (XMEGA)"

   def __init__(self, api):
       super(UserScript, self).__init__(api)

   def run(self):
       #User commands here
       self.api.setParameter(['Generic Settings', 'Scope Module', 'ChipWhisperer/OpenADC'])
       self.api.setParameter(['Generic Settings', 'Target Module', 'Simple Serial'])
       self.api.setParameter(['Generic Settings', 'Trace Format', 'ChipWhisperer/Native'])
       self.api.setParameter(['Simple Serial', 'Connection', 'ChipWhisperer-Lite'])
       self.api.setParameter(['ChipWhisperer/OpenADC', 'Connection', 'ChipWhisperer-Lite'])
               
       self.api.connect()
       
       #Example of using a list to set parameters. Slightly easier to copy/paste in this format
       lstexample = [['CW Extra Settings', 'Trigger Pins', 'Target IO4 (Trigger Line)', True],
                     ['CW Extra Settings', 'Target IOn Pins', 'Target IO1', 'Serial RXD'],
                     ['CW Extra Settings', 'Target IOn Pins', 'Target IO2', 'Serial TXD'],
                     ['OpenADC', 'Clock Setup', 'CLKGEN Settings', 'Desired Frequency', 7370000.0],
                     ['CW Extra Settings', 'Target HS IO-Out', 'CLKGEN'],
                     ['OpenADC', 'Clock Setup', 'ADC Clock', 'Source', 'CLKGEN x4 via DCM'],
                     ['OpenADC', 'Trigger Setup', 'Total Samples', 3000],
                     ['OpenADC', 'Trigger Setup', 'Offset', 1250],
                     ['OpenADC', 'Gain Setting', 'Setting', 45],
                     ['OpenADC', 'Trigger Setup', 'Mode', 'rising edge'],
                     #Final step: make DCMs relock in case they are lost
                     ['OpenADC', 'Clock Setup', 'ADC Clock', 'Reset ADC DCM', None],
                     ]
       for cmd in lstexample: self.api.setParameter(cmd)
       
       #Let's only do a few traces
       self.api.setParameter(['Generic Settings', 'Acquisition Settings', 'Number of Traces', 50])
                     
       #The environment is already set, lets do our first capture
       self.api.capture1()

User scripts should inherit from UserScriptBase that specifies the run() method that is called when clicking it in the menu or pressing the attack button (in the analyzer tool). The API is passed as an argument by the GUI throught the constructor in order to allow the script to "remote control" the existing section. A name and a description should also be specified. The section "if __name__ == '__main__':" is not mandatory, but is recommended if you want to run the script from the terminal. In this case, you don't need to use the GUI, the capture can be performed using only the API. Ex.:

if __name__ == '__main__':

   import sys
   from chipwhisperer.common.api.CWCoreAPI import CWCoreAPI
   api = CWCoreAPI()               # Instantiate the API
   api.runScriptClass(UserScript)  # Run UserScript through the API

or if you want the GUI:

if __name__ == '__main__':

   import sys
   from chipwhisperer.common.api.CWCoreAPI import CWCoreAPI
   import chipwhisperer.capture.ui.CWCaptureGUI as cwc       # Import the ChipWhispererCapture GUI
   from chipwhisperer.common.utils.parameter import Parameter
   app = cwc.makeApplication()  
   Parameter.usePyQtGraph = True 
   api = CWCoreAPI()               # Instantiate the API
   gui = cwc.CWAnalyzerGUI(api) # Instantiate the GUI
   gui.show() 
   api.runScriptClass(UserScript)  # Run UserScript through the API

   sys.exit(app.exec_()) 

New scripts can be added to the tool's menu automatically by saving it in its respective script folder: - chipwhisperer/software/chipwhisperer/capture/scripts - chipwhisperer/software/chipwhisperer/analyzer/scripts

These directories already have some examples which can be used as a reference to create new ones. Files put in these directories are scanned during the tool initialization and all plugin classes (subclass of Plugin) in all public files (not starting with "_") are loaded. Scripts auto-generated by the analyzer tool can also be used standalone or saved in the scripts directory so it will show up in the next execution.