220 lines
8.1 KiB
Java
220 lines
8.1 KiB
Java
package de.vanitasvitae.enigmandroid.enigma;
|
|
|
|
import java.math.BigInteger;
|
|
|
|
import de.vanitasvitae.enigmandroid.enigma.rotors.EntryWheel;
|
|
import de.vanitasvitae.enigmandroid.enigma.rotors.Reflector;
|
|
import de.vanitasvitae.enigmandroid.enigma.rotors.Rotor;
|
|
|
|
/**
|
|
* Implementation of the Enigma machine of name G31 (Abwehr)
|
|
* Copyright (C) 2015 Paul Schaub
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along
|
|
with this program; if not, write to the Free Software Foundation, Inc.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
* @author vanitasvitae
|
|
*/
|
|
public class Enigma_G31 extends Enigma
|
|
{
|
|
protected EntryWheel entryWheel;
|
|
protected Rotor rotor1;
|
|
protected Rotor rotor2;
|
|
protected Rotor rotor3;
|
|
protected Reflector reflector;
|
|
|
|
public Enigma_G31()
|
|
{
|
|
super();
|
|
machineType = "G31";
|
|
}
|
|
|
|
@Override
|
|
protected void establishAvailableParts()
|
|
{
|
|
addAvailableEntryWheel(new EntryWheel.EntryWheel_QWERTZ());
|
|
addAvailableRotor(new Rotor.Rotor_G31_I(0, 0));
|
|
addAvailableRotor(new Rotor.Rotor_G31_II(0, 0));
|
|
addAvailableRotor(new Rotor.Rotor_G31_III(0, 0));
|
|
addAvailableReflector(new Reflector.ReflectorEnigma_D_KD_G31());
|
|
}
|
|
|
|
@Override
|
|
public void initialize()
|
|
{
|
|
this.entryWheel = getEntryWheel(0);
|
|
this.rotor1 = getRotor(0);
|
|
this.rotor2 = getRotor(1);
|
|
this.rotor3 = getRotor(2);
|
|
this.reflector = getReflector(0);
|
|
}
|
|
|
|
@Override
|
|
public void nextState()
|
|
{
|
|
rotor1.rotate();
|
|
if (rotor1.isAtTurnoverPosition())
|
|
{
|
|
rotor2.rotate();
|
|
if (rotor2.isAtTurnoverPosition())
|
|
{
|
|
rotor3.rotate();
|
|
if(rotor3.isAtTurnoverPosition())
|
|
{
|
|
reflector.setRotation(reflector.getRotation()+1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
protected void generateState()
|
|
{
|
|
int r1, r2=-1, r3;
|
|
r1 = rand.nextInt(3);
|
|
while(r2 == -1 || r2 == r1) r2 = rand.nextInt(3);
|
|
r3 = 3 - r1 - r2;
|
|
|
|
int rot1 = rand.nextInt(26);
|
|
int rot2 = rand.nextInt(26);
|
|
int rot3 = rand.nextInt(26);
|
|
int rotRef = rand.nextInt(26);
|
|
int ring1 = rand.nextInt(26);
|
|
int ring2 = rand.nextInt(26);
|
|
int ring3 = rand.nextInt(26);
|
|
int ringRef = rand.nextInt(26);
|
|
|
|
this.entryWheel = getEntryWheel(0);
|
|
this.rotor1 = getRotor(r1, rot1, ring1);
|
|
this.rotor2 = getRotor(r2, rot2, ring2);
|
|
this.rotor3 = getRotor(r3, rot3, ring3);
|
|
this.reflector = getReflector(0, rotRef, ringRef);
|
|
}
|
|
|
|
@Override
|
|
public char encryptChar(char k) {
|
|
nextState();
|
|
int x = ((int) k)-65; //Cast to int and remove Unicode Offset (A=65 in Unicode.)
|
|
//Encryption
|
|
//forward direction
|
|
x = entryWheel.encryptForward(x);
|
|
x = rotor1.normalize(x + rotor1.getRotation() - rotor1.getRingSetting());
|
|
x = rotor1.encryptForward(x);
|
|
x = rotor1.normalize(x - rotor1.getRotation() + rotor1.getRingSetting() + rotor2.getRotation() - rotor2.getRingSetting());
|
|
x = rotor2.encryptForward(x);
|
|
x = rotor1.normalize(x - rotor2.getRotation() + rotor2.getRingSetting() + rotor3.getRotation() - rotor3.getRingSetting());
|
|
x = rotor3.encryptForward(x);
|
|
x = rotor1.normalize(x - rotor3.getRotation() + rotor3.getRingSetting() + reflector.getRotation() - reflector.getRingSetting());
|
|
//backward direction
|
|
x = reflector.encrypt(x);
|
|
x = rotor1.normalize(x + rotor3.getRotation() - rotor3.getRingSetting() - reflector.getRotation() + reflector.getRingSetting());
|
|
x = rotor3.encryptBackward(x);
|
|
x = rotor1.normalize(x + rotor2.getRotation() - rotor2.getRingSetting() - rotor3.getRotation() + rotor3.getRingSetting());
|
|
x = rotor2.encryptBackward(x);
|
|
x = rotor1.normalize(x + rotor1.getRotation() - rotor1.getRingSetting() - rotor2.getRotation() + rotor2.getRingSetting());
|
|
x = rotor1.encryptBackward(x);
|
|
x = rotor1.normalize(x - rotor1.getRotation() + rotor1.getRingSetting());
|
|
x = entryWheel.encryptBackward(x);
|
|
return (char) (x + 65); //Add Offset again, cast back to char and return
|
|
}
|
|
|
|
@Override
|
|
public void setState(EnigmaStateBundle state)
|
|
{
|
|
this.entryWheel = getEntryWheel(state.getTypeEntryWheel());
|
|
this.rotor1 = getRotor(state.getTypeRotor1(), state.getRotationRotor1(), state.getRingSettingRotor1());
|
|
this.rotor2 = getRotor(state.getTypeRotor2(), state.getRotationRotor2(), state.getRingSettingRotor2());
|
|
this.rotor3 = getRotor(state.getTypeRotor3(), state.getRotationRotor3(), state.getRingSettingRotor3());
|
|
this.reflector = getReflector(state.getTypeReflector(),
|
|
state.getRotationReflector(), state.getRingSettingReflector());
|
|
}
|
|
|
|
@Override
|
|
public EnigmaStateBundle getState() {
|
|
EnigmaStateBundle state = new EnigmaStateBundle();
|
|
|
|
state.setTypeEntryWheel(entryWheel.getIndex());
|
|
|
|
state.setTypeRotor1(rotor1.getIndex());
|
|
state.setTypeRotor2(rotor2.getIndex());
|
|
state.setTypeRotor3(rotor3.getIndex());
|
|
|
|
state.setRotationRotor1(rotor1.getRotation());
|
|
state.setRotationRotor2(rotor2.getRotation());
|
|
state.setRotationRotor3(rotor3.getRotation());
|
|
|
|
state.setRingSettingRotor1(rotor1.getRingSetting());
|
|
state.setRingSettingRotor2(rotor2.getRingSetting());
|
|
state.setRingSettingRotor3(rotor3.getRingSetting());
|
|
|
|
state.setTypeReflector(reflector.getIndex());
|
|
state.setRotationReflector(reflector.getRotation());
|
|
state.setRingSettingReflector(reflector.getRingSetting());
|
|
|
|
return state;
|
|
}
|
|
|
|
@Override
|
|
public void restoreState(BigInteger s)
|
|
{
|
|
int r1 = getValue(s, availableRotors.size());
|
|
s = removeDigit(s, availableRotors.size());
|
|
int r2 = getValue(s, availableRotors.size());
|
|
s = removeDigit(s, availableRotors.size());
|
|
int r3 = getValue(s, availableRotors.size());
|
|
s = removeDigit(s, availableRotors.size());
|
|
|
|
int rot1 = getValue(s, 26);
|
|
s = removeDigit(s, 26);
|
|
int ring1 = getValue(s, 26);
|
|
s = removeDigit(s, 26);
|
|
int rot2 = getValue(s, 26);
|
|
s = removeDigit(s, 26);
|
|
int ring2 = getValue(s, 26);
|
|
s = removeDigit(s, 26);
|
|
int rot3 = getValue(s, 26);
|
|
s = removeDigit(s, 26);
|
|
int ring3 = getValue(s, 26);
|
|
s = removeDigit(s, 26);
|
|
int rotRef = getValue(s, 26);
|
|
s = removeDigit(s, 26);
|
|
int ringRef = getValue(s, 26);
|
|
|
|
|
|
this.entryWheel = getEntryWheel(0);
|
|
this.rotor1 = getRotor(r1, rot1, ring1);
|
|
this.rotor2 = getRotor(r2, rot2, ring2);
|
|
this.rotor3 = getRotor(r3, rot3, ring3);
|
|
this.reflector = getReflector(0, rotRef, ringRef);
|
|
}
|
|
|
|
@Override
|
|
public String stateToString()
|
|
{
|
|
BigInteger s = BigInteger.valueOf(reflector.getRingSetting());
|
|
s = addDigit(s, reflector.getRotation(), 26);
|
|
s = addDigit(s, rotor3.getRingSetting(), 26);
|
|
s = addDigit(s, rotor3.getRotation(), 26);
|
|
s = addDigit(s, rotor2.getRingSetting(), 26);
|
|
s = addDigit(s, rotor2.getRotation(), 26);
|
|
s = addDigit(s, rotor1.getRingSetting(), 26);
|
|
s = addDigit(s, rotor1.getRotation(), 26);
|
|
|
|
s = addDigit(s, rotor3.getIndex(), availableRotors.size());
|
|
s = addDigit(s, rotor2.getIndex(), availableRotors.size());
|
|
s = addDigit(s, rotor1.getIndex(), availableRotors.size());
|
|
|
|
s = addDigit(s, 3, 20); //Machine #3
|
|
return s.toString(16);
|
|
}
|
|
}
|