Flare-On 4 Challenge #10 decryption tool

thetool.py

import string
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
import ui_mainwindow

encoded = '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'
#encoded = "IBZDEA0DYRFOEEgKRkUaDEVPAkENREVZCxRZTVIcTwZPDRcJWVMdCRYcFk4BDBEcCk4VBhBMHE8THVJTDAwWF1MAVQINAVMKTxQcREYYBhkHUgNPSS0bFkVaSCROF08bBgBSUxYAG0UARRgDHFoXRRUECA5JAA0HFFRNQxoKBVRBFwsEBFgAFQYFVEVOFQsDUggaEUUTGgAARUkaHA5UWQYbBk9XFh0eUkUDBxsIDEUNBxxDW0kVA1VTAwgeGAAREQgcEwAREAoNAlMAExYPS1MyFVUAQU4mU0EfTxcIVUERTBgCEAANGAkIF1NPEgcXUgdIA08ARRUbCk5SHA4GTw9SHAFSVEEFDQtVEQAOBxBSEkEXG1VUGEEMEQxUFk8XRVtJFQNVQRseDRVTQQ4SQRhTRgMMTBRSA08="
KEYLEN = 64
keymap = {}

class MainWindow(QMainWindow, ui_mainwindow.Ui_MainWindow):
    def __init__(self, parent=None):
        QMainWindow.__init__(self)
        # super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        ct = map(ord, list(encoded.decode('base64')))
        self.plainTextEdit.setPlainText(''.join(map(chr, ct)))


    @pyqtSlot()
    def on_plainTextEdit_cursorPositionChanged(self):
        visualOffset = self.plainTextEdit.textCursor().position()
        lineno = self.plainTextEdit.textCursor().blockNumber()
        actualOffset = visualOffset + lineno
        moddedOffset = actualOffset % KEYLEN

        self.spinBox_2.setValue(lineno)
        self.spinBox_3.setValue(actualOffset)
        self.spinBox.setValue(moddedOffset)

        if moddedOffset in keymap.keys():
            self.lineEdit.setText(chr(keymap[moddedOffset]))
        else:
            self.lineEdit.setText('NONE')


    @pyqtSlot(int)
    def on_spinBox_3_valueChanged(self, value):
        actualOffset = value
        moddedOffset = actualOffset % KEYLEN
        self.spinBox.setValue(moddedOffset)

        if actualOffset in keymap.keys():
            self.lineEdit.setText(chr(keymap[actualOffset]))
        else:
            self.lineEdit.setText('NONE')



    @pyqtSlot()
    def on_pushButton_clicked(self, *args):
        ct = map(ord, list(encoded.decode('base64')))
        actualOffset = self.spinBox_3.value()
        actualOffset %= KEYLEN

        if str(self.lineEdit.text()) == 'CR':
            char = ord('\r')
        elif str(self.lineEdit.text()) == 'LF':
            char = ord('\n')
        elif str(self.lineEdit.text()) == 'TAB':
            char = ord('\t')

        elif len(self.lineEdit.text()) > 1:
            return

        else:
            char = ord(str(self.lineEdit.text()))
        ct_display = [chr(2)] * len(ct)

        keymap[actualOffset] = char
        for p in keymap.keys():
            v = keymap[p]
            ct[p] = v
            ct_display[p] = chr(v)
            for i in xrange(p+KEYLEN, len(ct), KEYLEN):
                ct[i] ^= v
                ct_display[i] = chr(ct[i])
                v = ct[i]

        self.disconnect(self.plainTextEdit, SIGNAL('cursorPositionChanged()'), self.on_plainTextEdit_cursorPositionChanged)
        self.plainTextEdit.setPlainText(''.join(ct_display))
        #self.plainTextEdit.setPlainText(''.join(map(lambda x: x if x in string.printable else chr(21), map(chr, ct))))
        self.connect(self.plainTextEdit, SIGNAL('cursorPositionChanged()'), self.on_plainTextEdit_cursorPositionChanged)


app = QApplication(sys.argv)
app.setStyle("cleanlooks")
win = MainWindow()
win.show()
sys.exit(app.exec_())

ui_mainwindow.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'window.ui'
#
# Created: Wed Sep 27 12:47:57 2017
#      by: PyQt4 UI code generator 4.10.1
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(815, 502)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.horizontalLayout_2 = QtGui.QHBoxLayout(self.centralwidget)
        self.horizontalLayout_2.setObjectName(_fromUtf8("horizontalLayout_2"))
        self.verticalLayout = QtGui.QVBoxLayout()
        self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
        self.plainTextEdit = QtGui.QPlainTextEdit(self.centralwidget)
        font = QtGui.QFont()
        font.setFamily(_fromUtf8("Inconsolata"))
        font.setPointSize(12)
        self.plainTextEdit.setFont(font)
        self.plainTextEdit.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAsNeeded)
        self.plainTextEdit.setUndoRedoEnabled(False)
        self.plainTextEdit.setLineWrapMode(QtGui.QPlainTextEdit.NoWrap)
        self.plainTextEdit.setPlainText(_fromUtf8(""))
        self.plainTextEdit.setObjectName(_fromUtf8("plainTextEdit"))
        self.verticalLayout.addWidget(self.plainTextEdit)
        self.horizontalLayout = QtGui.QHBoxLayout()
        self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
        self.label_4 = QtGui.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.label_4.setFont(font)
        self.label_4.setObjectName(_fromUtf8("label_4"))
        self.horizontalLayout.addWidget(self.label_4)
        self.spinBox_2 = QtGui.QSpinBox(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.spinBox_2.setFont(font)
        self.spinBox_2.setMaximum(500)
        self.spinBox_2.setObjectName(_fromUtf8("spinBox_2"))
        self.horizontalLayout.addWidget(self.spinBox_2)
        self.label_3 = QtGui.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.label_3.setFont(font)
        self.label_3.setObjectName(_fromUtf8("label_3"))
        self.horizontalLayout.addWidget(self.label_3)
        self.spinBox_3 = QtGui.QSpinBox(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.spinBox_3.setFont(font)
        self.spinBox_3.setMaximum(3000)
        self.spinBox_3.setObjectName(_fromUtf8("spinBox_3"))
        self.horizontalLayout.addWidget(self.spinBox_3)
        self.label = QtGui.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.label.setFont(font)
        self.label.setObjectName(_fromUtf8("label"))
        self.horizontalLayout.addWidget(self.label)
        self.spinBox = QtGui.QSpinBox(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.spinBox.setFont(font)
        self.spinBox.setReadOnly(True)
        self.spinBox.setMaximum(63)
        self.spinBox.setObjectName(_fromUtf8("spinBox"))
        self.horizontalLayout.addWidget(self.spinBox)
        self.label_2 = QtGui.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.label_2.setFont(font)
        self.label_2.setObjectName(_fromUtf8("label_2"))
        self.horizontalLayout.addWidget(self.label_2)
        self.lineEdit = QtGui.QLineEdit(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.lineEdit.setFont(font)
        self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
        self.horizontalLayout.addWidget(self.lineEdit)
        self.pushButton = QtGui.QPushButton(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(12)
        self.pushButton.setFont(font)
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.horizontalLayout.addWidget(self.pushButton)
        self.verticalLayout.addLayout(self.horizontalLayout)
        self.horizontalLayout_2.addLayout(self.verticalLayout)
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "o__o", None))
        self.label_4.setText(_translate("MainWindow", "Line no:", None))
        self.label_3.setText(_translate("MainWindow", "Actual offset:", None))
        self.label.setText(_translate("MainWindow", "Modded offset", None))
        self.label_2.setText(_translate("MainWindow", "Character:", None))
        self.pushButton.setText(_translate("MainWindow", "Set", None))