206 lines
8.3 KiB
Java
206 lines
8.3 KiB
Java
package de.vanitasvitae.enigmandroid.enigma;
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import de.vanitasvitae.enigmandroid.MainActivity;
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import de.vanitasvitae.enigmandroid.enigma.rotors.Reflector;
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import de.vanitasvitae.enigmandroid.enigma.rotors.Rotor;
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/**
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* Concrete implementation of an enigma machine of type D
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* This machine has a rewirable UKW, non changeable rotors.
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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_D extends Enigma {
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protected Rotor entryWheel;
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protected Rotor rotor1;
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protected Rotor rotor2;
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protected Rotor rotor3;
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protected Reflector.ReflectorEnigma_D_KD_G31 reflector;
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protected static int machineTypeOffset = 70;
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public Enigma_D()
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{
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super();
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machineType = "D";
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}
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@Override
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public void initialize()
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{
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this.entryWheel = Rotor.createRotor(1, 0, 0);
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this.rotor1 = Rotor.createRotor(machineTypeOffset, 0, 0);
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this.rotor2 = Rotor.createRotor(machineTypeOffset, 0, 0);
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this.rotor3 = Rotor.createRotor(machineTypeOffset, 0, 0);
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this.reflector = (Reflector.ReflectorEnigma_D_KD_G31) Reflector.createReflector(machineTypeOffset);
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}
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@Override
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public void nextState()
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{
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rotor1.rotate();
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if (rotor1.isAtTurnoverPosition() || (this.doAnomaly && prefAnomaly))
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{
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rotor2.rotate();
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this.doAnomaly = rotor2.doubleTurnAnomaly();
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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 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 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 ringRef = rand.nextInt(26);
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this.rotor1 = Rotor.createRotor(machineTypeOffset, rot1, ring1);
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this.rotor2 = Rotor.createRotor(machineTypeOffset+1, rot2, ring2);
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this.rotor3 = Rotor.createRotor(machineTypeOffset+2, rot3, ring3);
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this.reflector = (Reflector.ReflectorEnigma_D_KD_G31) Reflector.createReflector(machineTypeOffset);
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this.reflector.setRotation(rotRef);
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this.reflector.setRingSetting(ringRef);
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this.reflector.setConfiguration(Plugboard.seedToReflectorConfiguration(rand));
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}
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@Override
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public char encryptChar(char k)
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{
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nextState();
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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 = 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() + reflector.getRotation() - reflector.getRingSetting());
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//backward direction
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x = reflector.encrypt(x);
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x = rotor1.normalize(x + rotor3.getRotation() - rotor3.getRingSetting() - reflector.getRotation() + reflector.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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return (char) (x + 65); //Add Offset again, cast back to char and return
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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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this.entryWheel = Rotor.createRotor(state.getTypeEntryWheel(), 0, 0);
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this.rotor1 = Rotor.createRotor(state.getTypeRotor1(), state.getRotationRotor1(), state.getRingSettingRotor1());
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this.rotor2 = Rotor.createRotor(state.getTypeRotor2(), state.getRotationRotor2(), state.getRingSettingRotor2());
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this.rotor3 = Rotor.createRotor(state.getTypeRotor3(), state.getRotationRotor3(), state.getRingSettingRotor3());
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this.reflector = new Reflector.ReflectorEnigma_D_KD_G31();
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this.reflector.setConfiguration(state.getConfigurationReflector());
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this.reflector.setRotation(state.getRotationReflector());
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this.reflector.setRingSetting(state.getRingSettingReflector());
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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.getNumber());
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state.setTypeRotor1(rotor1.getNumber());
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state.setTypeRotor2(rotor2.getNumber());
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state.setTypeRotor3(rotor3.getNumber());
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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.setRingSettingRotor1(rotor1.getRingSetting());
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state.setRingSettingRotor2(rotor2.getRingSetting());
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state.setRingSettingRotor3(rotor3.getRingSetting());
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state.setTypeReflector(reflector.getNumber());
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state.setRotationReflector(reflector.getRotation());
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state.setRingSettingReflector(reflector.getRingSetting());
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state.setConfigurationReflector(reflector.getConfiguration());
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return state;
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}
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@Override
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public void restoreState(String mem)
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{
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String reflectorConf = mem.substring(mem.lastIndexOf(":r")+2);
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long s = Long.valueOf(mem.substring(0, mem.indexOf(":r")));
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s = removeDigit(s, 20); //Remove machine type
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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 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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this.rotor1 = Rotor.createRotor(machineTypeOffset, rot1, ring1);
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this.rotor2 = Rotor.createRotor(machineTypeOffset+1, rot2, ring2);
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this.rotor3 = Rotor.createRotor(machineTypeOffset+2, rot3, ring3);
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this.reflector = (Reflector.ReflectorEnigma_D_KD_G31) Reflector.createReflector(machineTypeOffset);
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this.reflector.setConfiguration(Plugboard.stringToConfiguration(reflectorConf));
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this.reflector.setRotation(rotRef);
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this.reflector.setRingSetting(ringRef);
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}
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@Override
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public String stateToString() {
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String save = MainActivity.APP_ID+"/";
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long s = reflector.getRingSetting();
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s = addDigit(s, reflector.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, 6, 20); //Machine #6
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save = save+s;
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save = save + ":r" + Plugboard.configurationToString(getState().getConfigurationReflector());
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return save;
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}
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}
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