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Typex: move machine implementation to lib/
This commit is contained in:
s2224834
parent
eb1f8b4bc6
commit
53cc413eae
2 changed files with 193 additions and 183 deletions
183
src/core/lib/Typex.mjs
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183
src/core/lib/Typex.mjs
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@ -0,0 +1,183 @@
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/**
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* Emulation of the Typex machine.
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*
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* @author s2224834
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* @copyright Crown Copyright 2019
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* @license Apache-2.0
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*/
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import OperationError from "../errors/OperationError";
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import * as Enigma from "../lib/Enigma";
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import Utils from "../Utils";
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export const ROTORS = [
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{name: "1", value: "QWECYJIBFKMLTVZPOHUDGNRSXA<ACEINQTVY"},
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{name: "2", value: "AJDKSIRUXBLHWTMCQGZNPYFVOE<ACEINQTVY"},
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{name: "3", value: "BDFHJLCPRTXVZNYEIWGAKMUSQO<ACEINQTVY"},
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{name: "4", value: "ESOVPZJAYQUIRHXLNFTGKDCMWB<ACEINQTVY"},
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{name: "5", value: "VZBRGITYUPSDNHLXAWMJQOFECK<ACEINQTVY"},
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{name: "6", value: "FVPJIAOYEDRZXWGCTKUQSBNMHL<ACEINQTVY"},
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{name: "7", value: "KZGLIUCJEHADXRYWVTNSFQPMOB<ACEINQTVY"},
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{name: "8", value: "ZLVGOIFTYWUEPMABNCXRQSDKHJ<ACEINQTVY"},
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];
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export const REFLECTORS = [
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{name: "Standard", value: "MO VW GL JX TZ AY EQ IP KN DH CU FS BR"},
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];
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// Special character handling on Typex keyboard
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const KEYBOARD = {
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"Q": "1", "W": "2", "E": "3", "R": "4", "T": "5", "Y": "6", "U": "7", "I": "8", "O": "9", "P": "0",
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"A": "-", "S": "/", "D": "Z", "F": "%", "G": "X", "H": "£", "K": "(", "L": ")",
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"C": "V", "B": "'", "N": ",", "M": "."
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};
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const KEYBOARD_REV = {};
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for (const i of Object.keys(KEYBOARD)) {
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KEYBOARD_REV[KEYBOARD[i]] = i;
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}
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/**
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* Typex machine. A lot like the Enigma, but five rotors, of which the first two are static.
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*/
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export class TypexMachine extends Enigma.EnigmaBase {
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/**
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* TypexMachine constructor.
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*
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* @param {Object[]} rotors - List of Rotors.
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* @param {Object} reflector - A Reflector.
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* @param {Plugboard} plugboard - A Plugboard.
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*/
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constructor(rotors, reflector, plugboard, keyboard) {
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super(rotors, reflector, plugboard);
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if (rotors.length !== 5) {
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throw new OperationError("Typex must have 5 rotors");
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}
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this.keyboard = keyboard;
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}
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/**
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* This is the same as the Enigma step function, it's just that the right-
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* most two rotors are static.
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*/
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step() {
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const r0 = this.rotors[2];
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const r1 = this.rotors[3];
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r0.step();
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// The second test here is the double-stepping anomaly
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if (r0.steps.has(r0.pos) || r1.steps.has(Utils.mod(r1.pos + 1, 26))) {
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r1.step();
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if (r1.steps.has(r1.pos)) {
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const r2 = this.rotors[4];
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r2.step();
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}
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}
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}
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/**
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* Encrypt/decrypt data. This is identical to the Enigma version cryptographically, but we have
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* additional handling for the Typex's keyboard (which handles various special characters by
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* mapping them to particular letter combinations).
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*
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* @param {string} input - The data to encrypt/decrypt.
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* @return {string}
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*/
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crypt(input) {
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let inputMod = input;
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if (this.keyboard === "Encrypt") {
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inputMod = "";
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// true = in symbol mode
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let mode = false;
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for (const x of input) {
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if (x === " ") {
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inputMod += "X";
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} else if (mode) {
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if (KEYBOARD_REV.hasOwnProperty(x)) {
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inputMod += KEYBOARD_REV[x];
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} else {
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mode = false;
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inputMod += "V" + x;
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}
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} else {
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if (KEYBOARD_REV.hasOwnProperty(x)) {
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mode = true;
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inputMod += "Z" + KEYBOARD_REV[x];
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} else {
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inputMod += x;
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}
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}
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}
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}
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const output = super.crypt(inputMod);
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let outputMod = output;
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if (this.keyboard === "Decrypt") {
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outputMod = "";
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let mode = false;
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for (const x of output) {
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if (x === "X") {
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outputMod += " ";
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} else if (x === "V") {
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mode = false;
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} else if (x === "Z") {
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mode = true;
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} else if (mode) {
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outputMod += KEYBOARD[x];
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} else {
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outputMod += x;
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}
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}
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}
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return outputMod;
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}
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}
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/**
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* Typex rotor. Like an Enigma rotor, but no ring setting, and can be reversed.
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*/
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export class Rotor extends Enigma.Rotor {
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/**
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* Rotor constructor.
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*
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* @param {string} wiring - A 26 character string of the wiring order.
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* @param {string} steps - A 0..26 character string of stepping points.
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* @param {bool} reversed - Whether to reverse the rotor.
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* @param {char} initialPosition - The initial position of the rotor.
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*/
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constructor(wiring, steps, reversed, initialPos) {
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let initialPosMod = initialPos;
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let wiringMod = wiring;
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if (reversed) {
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initialPosMod = Enigma.i2a(Utils.mod(26 - Enigma.a2i(initialPos), 26));
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const outMap = new Array(26).fill();
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for (let i=0; i<26; i++) {
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// wiring[i] is the original output
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// Enigma.LETTERS[i] is the original input
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const input = Utils.mod(26 - Enigma.a2i(wiring[i]), 26);
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const output = Enigma.i2a(Utils.mod(26 - Enigma.a2i(Enigma.LETTERS[i]), 26));
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outMap[input] = output;
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}
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wiringMod = outMap.join("");
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}
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super(wiringMod, steps, "A", initialPosMod);
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}
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}
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/**
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* Typex input plugboard. Based on a Rotor, because it allows arbitrary maps, not just switches
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* like the Enigma plugboard.
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* Not to be confused with the reflector plugboard.
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*/
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export class Plugboard extends Enigma.Rotor {
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/**
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* Typex plugboard constructor.
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*
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* @param {string} wiring - 26 character string of mappings from A-Z, as per rotors, or "".
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*/
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constructor(wiring) {
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try {
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super(wiring, "", "A", "A");
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} catch (err) {
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throw new OperationError(err.message.replace("Rotor", "Plugboard"));
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}
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}
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}
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@ -8,186 +8,13 @@
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import Operation from "../Operation";
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import OperationError from "../errors/OperationError";
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import Utils from "../Utils";
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import * as Enigma from "../lib/Enigma";
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const ROTORS = [
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{name: "1", value: "QWECYJIBFKMLTVZPOHUDGNRSXA<ACEINQTVY"},
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{name: "2", value: "AJDKSIRUXBLHWTMCQGZNPYFVOE<ACEINQTVY"},
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{name: "3", value: "BDFHJLCPRTXVZNYEIWGAKMUSQO<ACEINQTVY"},
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{name: "4", value: "ESOVPZJAYQUIRHXLNFTGKDCMWB<ACEINQTVY"},
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{name: "5", value: "VZBRGITYUPSDNHLXAWMJQOFECK<ACEINQTVY"},
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{name: "6", value: "FVPJIAOYEDRZXWGCTKUQSBNMHL<ACEINQTVY"},
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{name: "7", value: "KZGLIUCJEHADXRYWVTNSFQPMOB<ACEINQTVY"},
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{name: "8", value: "ZLVGOIFTYWUEPMABNCXRQSDKHJ<ACEINQTVY"},
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];
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const REFLECTORS = [
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{name: "Standard", value: "MO VW GL JX TZ AY EQ IP KN DH CU FS BR"},
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];
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// Special character handling on Typex keyboard
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const KEYBOARD = {
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"Q": "1", "W": "2", "E": "3", "R": "4", "T": "5", "Y": "6", "U": "7", "I": "8", "O": "9", "P": "0",
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"A": "-", "S": "/", "D": "Z", "F": "%", "G": "X", "H": "£", "K": "(", "L": ")",
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"C": "V", "B": "'", "N": ",", "M": "."
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};
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const KEYBOARD_REV = {};
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for (const i of Object.keys(KEYBOARD)) {
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KEYBOARD_REV[KEYBOARD[i]] = i;
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}
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/**
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* Typex machine. A lot like the Enigma, but five rotors, of which the first two are static.
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*/
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class TypexMachine extends Enigma.EnigmaBase {
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/**
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* TypexMachine constructor.
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*
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* @param {Object[]} rotors - List of Rotors.
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* @param {Object} reflector - A Reflector.
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* @param {Plugboard} plugboard - A Plugboard.
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*/
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constructor(rotors, reflector, plugboard, keyboard) {
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super(rotors, reflector, plugboard);
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if (rotors.length !== 5) {
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throw new OperationError("Typex must have 5 rotors");
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}
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this.keyboard = keyboard;
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}
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/**
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* This is the same as the Enigma step function, it's just that the right-
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* most two rotors are static.
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*/
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step() {
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const r0 = this.rotors[2];
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const r1 = this.rotors[3];
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r0.step();
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// The second test here is the double-stepping anomaly
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if (r0.steps.has(r0.pos) || r1.steps.has(Utils.mod(r1.pos + 1, 26))) {
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r1.step();
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if (r1.steps.has(r1.pos)) {
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const r2 = this.rotors[4];
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r2.step();
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}
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}
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}
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/**
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* Encrypt/decrypt data. This is identical to the Enigma version cryptographically, but we have
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* additional handling for the Typex's keyboard (which handles various special characters by
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* mapping them to particular letter combinations).
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*
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* @param {string} input - The data to encrypt/decrypt.
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* @return {string}
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*/
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crypt(input) {
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let inputMod = input;
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if (this.keyboard === "Encrypt") {
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inputMod = "";
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// true = in symbol mode
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let mode = false;
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for (const x of input) {
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if (x === " ") {
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inputMod += "X";
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} else if (mode) {
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if (KEYBOARD_REV.hasOwnProperty(x)) {
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inputMod += KEYBOARD_REV[x];
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} else {
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mode = false;
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inputMod += "V" + x;
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}
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} else {
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if (KEYBOARD_REV.hasOwnProperty(x)) {
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mode = true;
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inputMod += "Z" + KEYBOARD_REV[x];
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} else {
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inputMod += x;
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}
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}
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}
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}
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const output = super.crypt(inputMod);
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let outputMod = output;
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if (this.keyboard === "Decrypt") {
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outputMod = "";
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let mode = false;
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for (const x of output) {
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if (x === "X") {
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outputMod += " ";
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} else if (x === "V") {
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mode = false;
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} else if (x === "Z") {
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mode = true;
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} else if (mode) {
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outputMod += KEYBOARD[x];
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} else {
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outputMod += x;
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}
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}
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}
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return outputMod;
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}
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}
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/**
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* Typex rotor. Like an Enigma rotor, but no ring setting, and can be reversed.
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*/
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class Rotor extends Enigma.Rotor {
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/**
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* Rotor constructor.
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*
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* @param {string} wiring - A 26 character string of the wiring order.
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* @param {string} steps - A 0..26 character string of stepping points.
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* @param {bool} reversed - Whether to reverse the rotor.
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* @param {char} initialPosition - The initial position of the rotor.
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*/
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constructor(wiring, steps, reversed, initialPos) {
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let initialPosMod = initialPos;
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let wiringMod = wiring;
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if (reversed) {
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initialPosMod = Enigma.i2a(Utils.mod(26 - Enigma.a2i(initialPos), 26));
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const outMap = new Array(26).fill();
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for (let i=0; i<26; i++) {
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// wiring[i] is the original output
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// Enigma.LETTERS[i] is the original input
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const input = Utils.mod(26 - Enigma.a2i(wiring[i]), 26);
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const output = Enigma.i2a(Utils.mod(26 - Enigma.a2i(Enigma.LETTERS[i]), 26));
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outMap[input] = output;
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}
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wiringMod = outMap.join("");
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}
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super(wiringMod, steps, "A", initialPosMod);
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}
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}
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/**
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* Typex input plugboard. Based on a Rotor, because it allows arbitrary maps, not just switches
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* like the Enigma plugboard.
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* Not to be confused with the reflector plugboard.
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*/
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class Plugboard extends Enigma.Rotor {
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/**
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* Typex plugboard constructor.
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*
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* @param {string} wiring - 26 character string of mappings from A-Z, as per rotors, or "".
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*/
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constructor(wiring) {
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try {
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super(wiring, "", "A", "A");
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} catch (err) {
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throw new OperationError(err.message.replace("Rotor", "Plugboard"));
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}
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}
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}
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import {LETTERS, Reflector} from "../lib/Enigma";
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import {ROTORS, REFLECTORS, TypexMachine, Plugboard, Rotor} from "../lib/Typex";
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/**
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* Typex operation
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*/
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class TypexOp extends Operation {
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class Typex extends Operation {
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/**
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* Typex constructor
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*/
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@ -215,7 +42,7 @@ class TypexOp extends Operation {
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{
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name: "1st rotor initial value",
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type: "option",
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value: Enigma.LETTERS
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value: LETTERS
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},
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{
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name: "2nd (static) rotor",
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@ -231,7 +58,7 @@ class TypexOp extends Operation {
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{
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name: "2nd rotor initial value",
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type: "option",
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value: Enigma.LETTERS
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value: LETTERS
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},
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{
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name: "3rd rotor",
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@ -247,7 +74,7 @@ class TypexOp extends Operation {
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{
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name: "3rd rotor initial value",
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type: "option",
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value: Enigma.LETTERS
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value: LETTERS
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},
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{
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name: "4th rotor",
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@ -263,7 +90,7 @@ class TypexOp extends Operation {
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{
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name: "4th rotor initial value",
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type: "option",
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value: Enigma.LETTERS
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value: LETTERS
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},
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{
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name: "5th rotor",
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@ -279,7 +106,7 @@ class TypexOp extends Operation {
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{
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name: "5th rotor initial value",
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type: "option",
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value: Enigma.LETTERS
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value: LETTERS
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},
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{
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name: "Reflector",
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@ -338,7 +165,7 @@ class TypexOp extends Operation {
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const [rotorwiring, rotorsteps] = this.parseRotorStr(args[i*3]);
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rotors.push(new Rotor(rotorwiring, rotorsteps, args[i*3 + 1], args[i*3+2]));
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}
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const reflector = new Enigma.Reflector(reflectorstr);
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const reflector = new Reflector(reflectorstr);
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let plugboardstrMod = plugboardstr;
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if (plugboardstrMod === "") {
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plugboardstrMod = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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@ -393,4 +220,4 @@ class TypexOp extends Operation {
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}
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export default TypexOp;
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export default Typex;
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