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→Appendix A: Target Code: Added new code
= Appendix A: Target Code =
# -*- coding: utf-8 -*-
#
# Copyright (c) 2013-20142016, NewAE Technology Inc
# All rights reserved.
#
# Authors: Colin O'Flynn, Greg d'Eon
#
# Find this and more at newae.com - this file is part of the chipwhisperer
#
# You should have received a copy of the GNU General Public License
# along with chipwhisperer. If not, see <<http://www.gnu.org/licenses/>>.
#=================================================
import sys
import time
# Class Crc
#############################################################
# These CRC routines are copy-pasted from pycrc, which are:
# Copyright (c) 2006-2013 Thomas Pircher <<tehpeh@gmx.net>>
#
class Crc(object):
A base class for CRC routines.
def __init__(self, width, poly):
The parameters are as follows:
reflect_out
xor_out
self.Width = width
self.Poly = poly
self.MSB_Mask = 0x1 << << (self.Width - 1) self.Mask = ((self.MSB_Mask - 1) << << 1) | 1
self.XorIn = 0x0000
self.DirectInit = self.XorIn
self.NonDirectInit = self.__get_nondirect_init(self.XorIn)
if self.Width < < 8:
self.CrcShift = 8 - self.Width
else:
def __get_nondirect_init(self, init):
return the non-direct init if the direct algorithm has been selected.
crc = init
for i in range(self.Width):
bit = crc & 0x01
if bit:
crc ^= self.Poly
crc >>>>= 1
if bit:
crc |= self.MSB_Mask
return crc & self.Mask
def bit_by_bit(self, in_data):
Classic simple and slow CRC implementation. This function iterates bit
by bit over the augmented input message and returns the calculated CRC
value at the end.
# If the input data is a string, convert to bytes.
if isinstance(in_data, str):
for octet in in_data:
for i in range(8):
topbit = register & self.MSB_Mask register = ((register << << 1) & self.Mask) | ((octet >> >> (7 - i)) & 0x01)
if topbit:
register ^= self.Poly
for i in range(self.Width):
topbit = register & self.MSB_Mask register = ((register << << 1) & self.Mask)
if topbit:
register ^= self.Poly
return register ^ self.XorOut
class BootloaderTarget(TargetTemplate):
self.keylength = 16
self.input = """"
self.crc = Crc(width=16, poly=0x1021)
def setKeyLen(self, klen):
def keyLen(self):
return self.keylength
def getConnection(self):
return self.ser
def setConnection(self, con):
self.ser = con
self.params.append(self.ser.getParams())
self.ser.connectStatus.connect(self.connectStatus.emit)
self.ser.selectionChanged()
def paramListcon(self, scope=None): return []if not scope or not hasattr(scope, "qtadc"): Warning( "You need a scope with OpenADC connected to use this Target")
self.ser.flush()
def close(self):
if self.ser != None:
self.ser.close()
return
def setModeDecrypt(self):
return
def convertVarToString(self, var):
if isinstance(var, str):
return var
sep = ""
s = sep.join(["%c" % b for b in var])
return s
def loadEncryptionKey(self, key):
def loadInput(self, inputtext):
self.input = inputtext
def readOutput(self):
# No actual output
return [0] * 16
def isDone(self):
return True
def readOutputcheckEncryptionKey(self, kin): #No actual output return [0] * 16kin
def go(self):
crcdata = self.crc.bit_by_bit(self.input)
message.append(crcdata >> >> 8) message.append(crcdata & 0xff)
# Write message
message = self.convertVarToString(message)
for i in range(0, 5):
self.ser.flush()
data = self.ser.read(1)
if len(data) > > 0:
resp = ord(data[0])
if resp != 0xA1:
raise IOError(""Bad Response %x" " % resp)
if len(data) > > 0:
if resp != 0xA4:
raise IOError(""Failed to communicate, last response: %x" " % resp)
else:
raise IOError(""Failed to communicate, no response"") def checkEncryptionKey(self, kin): return kin class userScript(QObject): def __init__(self, capture): super(userScript, self).__init__() self.capture = capture def run(self): cap = self.capture #User commands here print "***** Starting User Script *****" tbootloader = BootloaderTarget() cap.setParameter(['Generic Settings', 'Scope Module', 'ChipWhisperer/OpenADC']) cap.setParameter(['Generic Settings', 'Trace Format', 'ChipWhisperer/Native']) cap.target.setDriver(tbootloader) #Load FW (must be configured in GUI first) cap.FWLoaderGo() #NOTE: You MUST add this call to pe() to process events. This is done automatically #for setParameter() calls, but everything else REQUIRES this pe() cap.doConDis() pe() #Example of using a list to set parameters. Slightly easier to copy/paste in this format lstexample = [['CW Extra', 'CW Extra Settings', 'Trigger Pins', 'Front Panel A', False], ['CW Extra', 'CW Extra Settings', 'Trigger Pins', 'Target IO4 (Trigger Line)', True], ['CW Extra', 'CW Extra Settings', 'Clock Source', 'Target IO-IN'], ['OpenADC', 'Clock Setup', 'ADC Clock', 'Source', 'EXTCLK x4 via DCM'], ['OpenADC', 'Trigger Setup', 'Total Samples', 11000], ['OpenADC', 'Trigger Setup', 'Offset', 0], ['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], ['Generic Settings', 'Auxilary Module', 'Toggle FPGA-GPIO Pins'], ['GPIO Toggle', 'Standby State', 'High'], ['GPIO Toggle', 'Post-Toggle Delay', 150], ['GPIO Toggle', 'Toggle Length', 100], ] # For IV: offset = 70000 #Download all hardware setup parameters for cmd in lstexample: cap.setParameter(cmd) #Let's only do a few traces cap.setParameter(['Generic Settings', 'Acquisition Settings', 'Number of Traces', 50]) #Throw away first few cap.capture1() pe() cap.capture1() pe() print "***** Ending User Script *****" if __name__ == '__main__': #Make the application app = cwc.makeApplication() #If you DO NOT want to overwrite/use settings from the GUI version including #the recent files list, uncomment the following: #app.setApplicationName("Capture V2 Scripted") #Get main module capture = cwc.ChipWhispererCapture() #Show window - even if not used capture.show() #NB: Must call processEvents since we aren't using proper event loop pe() # Call user-specific commands usercommands = userScript(capture) usercommands.run() app.exec_() sys.exit()</pre>
= Appendix B: Capture Script =
