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@ -75,6 +75,8 @@
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"DES Decrypt",
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"Triple DES Encrypt",
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"Triple DES Decrypt",
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"LS47 Encrypt",
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"LS47 Decrypt",
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"RC2 Encrypt",
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"RC2 Decrypt",
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"RC4",
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@ -6,21 +6,27 @@
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import OperationError from "../errors/OperationError.mjs";
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let letters = "_abcdefghijklmnopqrstuvwxyz.0123456789,-+*/:?!'()";
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let tiles = [];
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const letters = "_abcdefghijklmnopqrstuvwxyz.0123456789,-+*/:?!'()";
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const tiles = [];
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export function init_tiles() {
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/**
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*
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*/
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export function initTiles() {
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for (let i = 0; i < 49; i++)
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tiles.push([letters.charAt(i), [Math.floor(i/7), i % 7]]);
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}
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function rotate_down(key, col, n) {
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let lines = [];
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for (let i = 0; i < 7; i++)
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/**
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*
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*/
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function rotateDown(key, col, n) {
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const lines = [];
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for (let i = 0; i < 7; i++)
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lines.push(key.slice(i*7, (i + 1) * 7));
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let lefts = [];
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const lefts = [];
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let mids = [];
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let rights = [];
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const rights = [];
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lines.forEach((element) => {
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lefts.push(element.slice(0, col));
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mids.push(element.charAt(col));
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@ -34,37 +40,49 @@ function rotate_down(key, col, n) {
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return result;
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}
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function rotate_right(key, row, n) {
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let mid = key.slice(row * 7, (row + 1) * 7);
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/**
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*
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*/
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function rotateRight(key, row, n) {
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const mid = key.slice(row * 7, (row + 1) * 7);
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n = (7 - n % 7) % 7;
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return key.slice(0, 7 * row) + mid.slice(n) + mid.slice(0, n) + key.slice(7 * (row + 1));
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}
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function find_ix(letter) {
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/**
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*
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*/
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function findIx(letter) {
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for (let i = 0; i < tiles.length; i++)
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if (tiles[i][0] === letter)
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return tiles[i][1];
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throw new OperationError("Letter " + letter + " is not included in LS47");
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}
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export function derive_key(password) {
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/**
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*
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*/
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export function deriveKey(password) {
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let i = 0;
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let k = letters;
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for (const c of password) {
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let [row, col] = find_ix(c);
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k = rotate_down(rotate_right(k, i, col), i, row);
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const [row, col] = findIx(c);
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k = rotateDown(rotateRight(k, i, col), i, row);
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i = (i + 1) % 7;
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}
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return k;
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}
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function check_key(key) {
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/**
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*
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*/
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function checkKey(key) {
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if (key.length !== letters.length)
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throw new OperationError("Wrong key size");
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let counts = new Array();
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const counts = new Array();
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for (let i = 0; i < letters.length; i++)
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counts[letters.charAt(i)] = 0;
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for (const elem of letters){
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for (const elem of letters) {
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if (letters.indexOf(elem) === -1)
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throw new OperationError("Letter " + elem + " not in LS47!");
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counts[elem]++;
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@ -73,76 +91,99 @@ function check_key(key) {
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}
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}
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function find_pos (key, letter) {
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let index = key.indexOf(letter);
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/**
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*
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*/
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function findPos (key, letter) {
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const index = key.indexOf(letter);
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if (index >= 0 && index < 49)
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return [Math.floor(index/7), index%7];
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throw new OperationError("Letter " + letter + " is not in the key!");
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}
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function find_at_pos(key, coord) {
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/**
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*
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*/
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function findAtPos(key, coord) {
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return key.charAt(coord[1] + (coord[0] * 7));
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}
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function add_pos(a, b) {
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/**
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*
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*/
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function addPos(a, b) {
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return [(a[0] + b[0]) % 7, (a[1] + b[1]) % 7];
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}
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function sub_pos(a, b) {
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let asub = a[0] - b[0];
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let bsub = a[1] - b[1];
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/**
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*
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*/
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function subPos(a, b) {
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const asub = a[0] - b[0];
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const bsub = a[1] - b[1];
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return [asub - (Math.floor(asub/7) * 7), bsub - (Math.floor(bsub/7) * 7)];
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}
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/**
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*
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*/
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function encrypt(key, plaintext) {
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check_key(key);
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checkKey(key);
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let mp = [0, 0];
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let ciphertext = '';
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let ciphertext = "";
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for (const p of plaintext) {
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let pp = find_pos(key, p);
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let mix = find_ix(find_at_pos(key, mp));
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let cp = add_pos(pp, mix);
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let c = find_at_pos(key, cp);
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const pp = findPos(key, p);
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const mix = findIx(findAtPos(key, mp));
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let cp = addPos(pp, mix);
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const c = findAtPos(key, cp);
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ciphertext += c;
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key = rotate_right(key, pp[0], 1);
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cp = find_pos(key, c);
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key = rotate_down(key, cp[1], 1);
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mp = add_pos(mp, find_ix(c));
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key = rotateRight(key, pp[0], 1);
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cp = findPos(key, c);
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key = rotateDown(key, cp[1], 1);
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mp = addPos(mp, findIx(c));
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}
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return ciphertext;
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}
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/**
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*
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*/
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function decrypt(key, ciphertext) {
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check_key(key);
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let mp = [0,0];
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let plaintext = '';
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checkKey(key);
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let mp = [0, 0];
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let plaintext = "";
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for (const c of ciphertext) {
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let cp = find_pos(key, c);
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let mix = find_ix(find_at_pos(key, mp));
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let pp = sub_pos(cp, mix);
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let p = find_at_pos(key, pp);
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let cp = findPos(key, c);
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const mix = findIx(findAtPos(key, mp));
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const pp = subPos(cp, mix);
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const p = findAtPos(key, pp);
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plaintext += p;
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key = rotate_right(key, pp[0], 1);
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cp = find_pos(key, c);
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key = rotate_down(key, cp[1], 1);
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mp = add_pos(mp, find_ix(c));
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key = rotateRight(key, pp[0], 1);
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cp = findPos(key, c);
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key = rotateDown(key, cp[1], 1);
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mp = addPos(mp, findIx(c));
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}
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return plaintext;
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}
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export function encrypt_pad(key, plaintext, signature, padding_size) {
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init_tiles();
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check_key(key);
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/**
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*
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*/
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export function encryptPad(key, plaintext, signature, paddingSize) {
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initTiles();
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checkKey(key);
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let padding = "";
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for (let i = 0; i < padding_size; i++) {
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for (let i = 0; i < paddingSize; i++) {
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padding += letters.charAt(Math.floor(Math.random() * letters.length));
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}
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return encrypt(key, padding+plaintext+'---'+signature);
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return encrypt(key, padding+plaintext+"---"+signature);
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}
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export function decrypt_pad(key, ciphertext, padding_size) {
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init_tiles();
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check_key(key);
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return decrypt(key, ciphertext).slice(padding_size);
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}
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/**
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*
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*/
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export function decryptPad(key, ciphertext, paddingSize) {
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initTiles();
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checkKey(key);
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return decrypt(key, ciphertext).slice(paddingSize);
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}
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@ -5,7 +5,7 @@
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*/
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import Operation from "../Operation.mjs";
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import * as LS47 from "../lib/LS47.mjs"
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import * as LS47 from "../lib/LS47.mjs";
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/**
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* LS47 Decrypt operation
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@ -45,12 +45,12 @@ class LS47Decrypt extends Operation {
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*/
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run(input, args) {
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this.padding_size = parseInt(args[1], 10);
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this.paddingSize = parseInt(args[1], 10);
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LS47.init_tiles();
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let key = LS47.derive_key(args[0]);
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return LS47.decrypt_pad(key, input, this.padding_size);
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LS47.initTiles();
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const key = LS47.deriveKey(args[0]);
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return LS47.decryptPad(key, input, this.paddingSize);
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}
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}
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@ -5,7 +5,7 @@
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*/
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import Operation from "../Operation.mjs";
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import * as LS47 from "../lib/LS47.mjs"
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import * as LS47 from "../lib/LS47.mjs";
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/**
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* LS47 Encrypt operation
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@ -49,13 +49,13 @@ class LS47Encrypt extends Operation {
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* @returns {string}
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*/
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run(input, args) {
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this.padding_size = parseInt(args[1], 10);
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LS47.init_tiles();
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let key = LS47.derive_key(args[0]);
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return LS47.encrypt_pad(key, input, args[2], this.padding_size);
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this.paddingSize = parseInt(args[1], 10);
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LS47.initTiles();
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const key = LS47.deriveKey(args[0]);
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return LS47.encryptPad(key, input, args[2], this.paddingSize);
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}
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}
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