How to use the chipwhisperer.common.utils.util.hexStrToByteArray function in chipwhisperer

def __init__(self):
        TargetTemplate.__init__(self)

        self.ser = SimpleSerial_ChipWhispererLite()

        self.keylength = 16
        self.textlength = 16
        self.outputlength = 16
        self.input = ""
        self.key = ""
        self._protver = 'auto'
        self._read_timeout = 500
        self.masklength = 18
        self._fixedMask = True
        self.initmask = '1F 70 D6 3C 23 EB 1A B8 6A D5 E2 0D 5F D9 58 A3 CA 9D'
        self._mask = util.hexStrToByteArray(self.initmask)
        self.protformat = 'hex'
        self.last_key = bytearray(16)

        # Preset lists are in the form
        # {'Dropdown Name':['Init Command', 'Load Key Command', 'Load Input Command', 'Go Command', 'Output Format']}
        # If a command is None, it's left unchanged and the text field is editable;
        # Otherwise, it's loaded with the value and set to readonly
        self.presets = {
            'Custom':[None, None, None, None, None],
            'SimpleSerial Encryption':['','k$KEY$\\n', '', 'p$TEXT$\\n', 'r$RESPONSE$\\n'],
            'SimpleSerial Authentication':['','k$KEY$\\n', 't$EXPECTED$\\n', 'p$TEXT$\\n', 'r$RESPONSE$\\n'],
            'Glitching':[None, None, None, None, '$GLITCH$\\n'],
        }
        self._preset = 'Custom'

        self._linkedmaskgroup = (('maskgroup', 'cmdmask'), ('maskgroup', 'initmask'), ('maskgroup', 'masktype'),

def setInitialMask(self, initialMask, binaryMask=False):
        if initialMask:
            if binaryMask:
                maskStr = ''
                for s in initialMask:
                    maskStr += '%02x' % s
                self._mask = bytearray(initialMask)
            else:
                maskStr = initialMask
                self._mask = util.hexStrToByteArray(initialMask)
            self.initmask = maskStr

def setInitialKey(self, initialKey, binaryKey=False):
        if initialKey:
            if binaryKey:
                keyStr = ''
                for s in initialKey:
                    keyStr += '%02x ' % s
                self._key = bytearray(initialKey)
            else:
                keyStr = initialKey
                self._key = util.hexStrToByteArray(initialKey)

            self.initkey = keyStr

def __init__(self, target=None):
        AcqKeyTextPattern_Base.__init__(self)
        self.initmask = 'FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00'
        self.initkey = '2B 7E 15 16 28 AE D2 A6 AB F7 15 88 09 CF 4F 3C'
        self._key = util.hexStrToByteArray(self.initkey)
        self._mask = util.hexStrToByteArray(self.initmask)

        self.getParams().addChildren([
            {'name':'Fixed Encryption Key', 'key':'initkey', 'type':'str', 'get':self.getInitialKey, 'set':self.setInitialKey, 'visible':True},
            {'name':'Plaintext Mask', 'key':'initmask', 'type':'str', 'get':self.getInitialMask, 'set':self.setInitialMask, 'visible':True},
        ])
        self.setTarget(target)

def setInitialMask(self, initialMask, binaryMask=False):
        if initialMask:
            if binaryMask:
                maskStr = ''
                for s in initialMask:
                    maskStr += '%02x ' % s
                self._mask = bytearray(initialMask)
            else:
                maskStr = initialMask
                self._mask = util.hexStrToByteArray(initialMask)

            self.initmask = maskStr

def __init__(self, target=None):
        AcqKeyTextPattern_Base.__init__(self)
        self._fixedKey = True
        self._fixedPlain = False
        self.inittext = '00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F'
        self.initkey = '2B 7E 15 16 28 AE D2 A6 AB F7 15 88 09 CF 4F 3C'
        self._key = util.hexStrToByteArray(self.initkey)
        self._textin = util.hexStrToByteArray(self.inittext)
        self.types = {'Random': False, 'Fixed': True}

        self.setTarget(target)

def setInitialKey(self, initialKey, binaryKey=False):
        if initialKey:
            if binaryKey:
                keyStr = ''
                for s in initialKey:
                    keyStr += '%02x ' % s
                self._key = bytearray(initialKey)
            else:
                keyStr = initialKey
                self._key = util.hexStrToByteArray(initialKey)

            self.initkey = keyStr

def setInitialText(self, initialText, binaryText=False):
        if initialText:
            if binaryText:
                textStr = ''
                for s in initialText:
                    textStr += '%02x ' % s
                self._textin = bytearray(initialText)
            else:
                textStr = initialText
                self._textin = util.hexStrToByteArray(initialText)

            self.inittext = textStr

def __init__(self, target=None):
        AcqKeyTextPattern_Base.__init__(self)
        self.initmask = 'FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00'
        self.initkey = '2B 7E 15 16 28 AE D2 A6 AB F7 15 88 09 CF 4F 3C'
        self._key = util.hexStrToByteArray(self.initkey)
        self._mask = util.hexStrToByteArray(self.initmask)

        self.getParams().addChildren([
            {'name':'Fixed Encryption Key', 'key':'initkey', 'type':'str', 'get':self.getInitialKey, 'set':self.setInitialKey, 'visible':True},
            {'name':'Plaintext Mask', 'key':'initmask', 'type':'str', 'get':self.getInitialMask, 'set':self.setInitialMask, 'visible':True},
        ])
        self.setTarget(target)