322 lines
11 KiB
Java
322 lines
11 KiB
Java
package de.vanitasvitae.enigmandroid.enigma;
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import android.util.Log;
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import java.math.BigInteger;
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import java.util.ArrayList;
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import de.vanitasvitae.enigmandroid.MainActivity;
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import de.vanitasvitae.enigmandroid.enigma.parts.EntryWheel;
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import de.vanitasvitae.enigmandroid.enigma.parts.Plugboard;
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import de.vanitasvitae.enigmandroid.enigma.parts.Reflector;
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import de.vanitasvitae.enigmandroid.enigma.parts.Rotor;
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/**
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* Concrete Implementation of the Enigma Machine name M4 of the german Kriegsmarine
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* Copyright (C) 2015 Paul Schaub
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* @author vanitasvitae
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*/
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public class Enigma_M4 extends Enigma
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{
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private ArrayList<Rotor> availableThinRotors;
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private EntryWheel entryWheel;
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private Rotor rotor1;
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private Rotor rotor2;
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private Rotor rotor3;
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private Rotor rotor4;
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private Reflector reflector;
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private Plugboard plugboard;
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public Enigma_M4()
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{
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super();
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machineType = "M4";
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Log.d(MainActivity.APP_ID, "Created Enigma M4");
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}
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private void addAvailableThinRotor(Rotor r)
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{
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if(availableThinRotors == null) availableThinRotors = new ArrayList<>();
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availableThinRotors.add(availableThinRotors.size(), r.setIndex(availableThinRotors.size()));
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}
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private Rotor getThinRotor(int index)
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{
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if(availableThinRotors == null || availableThinRotors.size() == 0) return null;
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return availableThinRotors.get(index % availableThinRotors.size()).getInstance();
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}
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private Rotor getThinRotor(int index, int rotation, int ringSettings)
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{
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Rotor r = getThinRotor(index);
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if(r == null) return null;
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return r.setRotation(rotation).setRingSetting(ringSettings);
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}
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@Override
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protected void establishAvailableParts()
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{
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Log.d(MainActivity.APP_ID, "Established");
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addAvailableEntryWheel(new EntryWheel.EntryWheel_ABCDEF());
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addAvailableRotor(new Rotor.Rotor_I(0, 0));
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addAvailableRotor(new Rotor.Rotor_II(0,0));
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addAvailableRotor(new Rotor.Rotor_III(0,0));
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addAvailableRotor(new Rotor.Rotor_IV(0,0));
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addAvailableRotor(new Rotor.Rotor_V(0,0));
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addAvailableRotor(new Rotor.Rotor_VI(0,0));
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addAvailableRotor(new Rotor.Rotor_VII(0, 0));
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addAvailableRotor(new Rotor.Rotor_VIII(0,0));
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addAvailableThinRotor(new Rotor.Rotor_M4_Beta(0, 0));
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addAvailableThinRotor(new Rotor.Rotor_M4_Gamma(0, 0));
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addAvailableReflector(new Reflector.Reflector_Thin_B());
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addAvailableReflector(new Reflector.ReflectorThinC());
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}
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@Override
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public void initialize()
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{
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Log.d(MainActivity.APP_ID, "Initialized");
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this.plugboard = new Plugboard();
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this.entryWheel = getEntryWheel(0);
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this.rotor1 = getRotor(0, 0, 0);
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this.rotor2 = getRotor(1, 0, 0);
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this.rotor3 = getRotor(2, 0, 0);
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this.rotor4 = getThinRotor(0, 0, 0);
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this.reflector = getReflector(0);
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}
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@Override
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/**
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* Set the enigma into the next mechanical state.
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* This rotates the first rotor and eventually also the second/third.
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* Also this method handles the anomaly in case it should happen.
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*/
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public void nextState()
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{
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//Rotate rotors
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rotor1.rotate();
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//Eventually turn next rotor (usual turnOver or anomaly)
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if (rotor1.isAtTurnoverPosition() || this.doAnomaly)
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{
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rotor2.rotate();
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//Set doAnomaly for next call of encryptChar
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this.doAnomaly = rotor2.doubleTurnAnomaly();
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//Eventually rotate next rotor
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if (rotor2.isAtTurnoverPosition())
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{
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rotor3.rotate();
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}
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}
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}
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@Override
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protected void generateState() {
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int r1, r2=-1, r3=-1;
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int r4;
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int ref;
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r1 = rand.nextInt(8);
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while(r2 == -1 || r2 == r1) r2 = rand.nextInt(8);
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while(r3 == -1 || r3 == r2 || r3 == r1) r3 = rand.nextInt(8);
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r4 = rand.nextInt(2);
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ref = rand.nextInt(2);
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int rot1 = rand.nextInt(26);
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int rot2 = rand.nextInt(26);
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int rot3 = rand.nextInt(26);
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int rot4 = rand.nextInt(26);
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int rotRef = rand.nextInt(26);
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int ring1 = rand.nextInt(26);
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int ring2 = rand.nextInt(26);
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int ring3 = rand.nextInt(26);
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int ring4 = rand.nextInt(26);
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int ringRef = rand.nextInt(26);
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this.entryWheel = getEntryWheel(0);
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this.rotor1 = getRotor(r1, rot1, ring1);
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this.rotor2 = getRotor(r2, rot2, ring2);
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this.rotor3 = getRotor(r3, rot3, ring3);
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this.rotor4 = getThinRotor(r4, rot4, ring4);
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this.reflector = getReflector(ref, rotRef, ringRef);
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this.plugboard = new Plugboard();
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this.plugboard.setConfiguration(Plugboard.seedToPlugboardConfiguration(rand));
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}
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@Override
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/**
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* Substitute char k by sending the signal through the enigma.
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* The signal passes the plugboard, the rotors and returns back after going through the
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* reflector wheel.
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*
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* @param k input char
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* @return substituted output char
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*/
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public char encryptChar(char k)
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{
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nextState(); //Rotate rotors
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int x = ((int) k)-65; //Cast to int and remove Unicode Offset (A=65 in Unicode.)
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//Encryption
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//forward direction
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x = plugboard.encrypt(x);
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x = entryWheel.encryptForward(x);
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x = rotor1.normalize(x + rotor1.getRotation() - rotor1.getRingSetting());
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x = rotor1.encryptForward(x);
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x = rotor1.normalize(x - rotor1.getRotation() + rotor1.getRingSetting() + rotor2.getRotation() - rotor2.getRingSetting());
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x = rotor2.encryptForward(x);
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x = rotor1.normalize(x - rotor2.getRotation() + rotor2.getRingSetting() + rotor3.getRotation() - rotor3.getRingSetting());
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x = rotor3.encryptForward(x);
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x = rotor1.normalize(x - rotor3.getRotation() + rotor3.getRingSetting() + rotor4.getRotation() - rotor4.getRingSetting());
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x = rotor4.encryptForward(x);
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x = rotor1.normalize(x - rotor4.getRotation() + rotor4.getRingSetting());
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//backward direction
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x = reflector.encrypt(x);
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x = rotor1.normalize(x + rotor4.getRotation() - rotor4.getRingSetting());
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x = rotor4.encryptBackward(x);
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x = rotor1.normalize(x + rotor3.getRotation() - rotor3.getRingSetting() - rotor4.getRotation() + rotor4.getRingSetting());
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x = rotor3.encryptBackward(x);
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x = rotor1.normalize(x + rotor2.getRotation() - rotor2.getRingSetting() - rotor3.getRotation() + rotor3.getRingSetting());
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x = rotor2.encryptBackward(x);
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x = rotor1.normalize(x + rotor1.getRotation() - rotor1.getRingSetting() - rotor2.getRotation() + rotor2.getRingSetting());
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x = rotor1.encryptBackward(x);
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x = rotor1.normalize(x - rotor1.getRotation() + rotor1.getRingSetting());
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x = entryWheel.encryptBackward(x);
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x = plugboard.encrypt(x);
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return (char) (x + 65); //Add Offset again and cast back to char
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}
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@Override
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public void setState(EnigmaStateBundle state)
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{
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rotor1 = getRotor(state.getTypeRotor1(), state.getRotationRotor1(), state.getRingSettingRotor1());
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rotor2 = getRotor(state.getTypeRotor2(), state.getRotationRotor2(), state.getRingSettingRotor2());
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rotor3 = getRotor(state.getTypeRotor3(), state.getRotationRotor3(), state.getRingSettingRotor3());
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rotor4 = getThinRotor(state.getTypeRotor4(), state.getRotationRotor4(), state.getRingSettingRotor4());
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reflector = getReflector(state.getTypeReflector());
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plugboard.setConfiguration(state.getConfigurationPlugboard());
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}
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@Override
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public EnigmaStateBundle getState()
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{
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EnigmaStateBundle state = new EnigmaStateBundle();
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state.setTypeEntryWheel(entryWheel.getIndex());
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state.setTypeRotor1(rotor1.getIndex());
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state.setTypeRotor2(rotor2.getIndex());
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state.setTypeRotor3(rotor3.getIndex());
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state.setTypeRotor4(rotor4.getIndex());
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state.setRotationRotor1(rotor1.getRotation());
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state.setRotationRotor2(rotor2.getRotation());
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state.setRotationRotor3(rotor3.getRotation());
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state.setRotationRotor4(rotor4.getRotation());
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state.setRingSettingRotor1(rotor1.getRingSetting());
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state.setRingSettingRotor2(rotor2.getRingSetting());
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state.setRingSettingRotor3(rotor3.getRingSetting());
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state.setRingSettingRotor4(rotor4.getRingSetting());
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state.setTypeReflector(reflector.getIndex());
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state.setConfigurationPlugboard(plugboard.getConfiguration());
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return state;
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}
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@Override
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public void restoreState(BigInteger s, int protocol_version)
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{
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switch (protocol_version)
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{
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case 1:
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int r1 = getValue(s, availableRotors.size());
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s = removeDigit(s, availableRotors.size());
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int r2 = getValue(s, availableRotors.size());
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s = removeDigit(s,availableRotors.size());
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int r3 = getValue(s, availableRotors.size());
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s = removeDigit(s,availableRotors.size());
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int r4 = getValue(s, availableThinRotors.size());
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s = removeDigit(s,availableThinRotors.size());
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int ref = getValue(s, availableReflectors.size());
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s = removeDigit(s,availableReflectors.size());
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int rot1 = getValue(s, 26);
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s = removeDigit(s,26);
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int ring1 = getValue(s, 26);
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s = removeDigit(s,26);
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int rot2 = getValue(s, 26);
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s = removeDigit(s,26);
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int ring2 = getValue(s, 26);
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s = removeDigit(s,26);
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int rot3 = getValue(s, 26);
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s = removeDigit(s,26);
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int ring3 = getValue(s, 26);
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s = removeDigit(s,26);
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int rot4 = getValue(s, 26);
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s = removeDigit(s,26);
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int ring4 = getValue(s, 26);
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s = removeDigit(s,26);
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int rotRef = getValue(s, 26);
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s = removeDigit(s,26);
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int ringRef = getValue(s, 26);
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s = removeDigit(s, 26);
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this.rotor1 = getRotor(r1, rot1, ring1);
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this.rotor2 = getRotor(r2, rot2, ring2);
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this.rotor3 = getRotor(r3, rot3, ring3);
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this.rotor4 = getThinRotor(r4, rot4, ring4);
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this.reflector = getReflector(ref, rotRef, ringRef);
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this.plugboard = new Plugboard();
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plugboard.setConfiguration(s);
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break;
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default: Log.e(MainActivity.APP_ID, "Unsupported protocol version "+protocol_version);
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}
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}
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@Override
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public BigInteger getEncodedState(int protocol_version) {
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BigInteger s = Plugboard.configurationToBigInteger(plugboard.getConfiguration());
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s = addDigit(s, reflector.getRingSetting(), 26);
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s = addDigit(s, reflector.getRotation(), 26);
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s = addDigit(s, rotor4.getRingSetting(), 26);
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s = addDigit(s, rotor4.getRotation(), 26);
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s = addDigit(s, rotor3.getRingSetting(), 26);
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s = addDigit(s, rotor3.getRotation(), 26);
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s = addDigit(s, rotor2.getRingSetting(), 26);
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s = addDigit(s, rotor2.getRotation(), 26);
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s = addDigit(s, rotor1.getRingSetting(), 26);
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s = addDigit(s, rotor1.getRotation(), 26);
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s = addDigit(s, reflector.getIndex(), availableReflectors.size());
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s = addDigit(s, rotor4.getIndex(), availableThinRotors.size());
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s = addDigit(s, rotor3.getIndex(), availableRotors.size());
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s = addDigit(s, rotor2.getIndex(), availableRotors.size());
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s = addDigit(s, rotor1.getIndex(), availableRotors.size());
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s = addDigit(s, 2, 20);
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s = addDigit(s, protocol_version, MainActivity.max_protocol_version);
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return s;
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}
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}
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