mirror of https://github.com/gchq/CyberChef.git
Merge branch 't-8ch-base45'
This commit is contained in:
n1474335
commit
74e43ff65a
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@ -1207,6 +1207,30 @@ class Utils {
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}[token];
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}
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/**
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* Iterate object in chunks of given size.
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*
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* @param {Iterable} iterable
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* @param {number} chunksize
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*/
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static* chunked(iterable, chunksize) {
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const iterator = iterable[Symbol.iterator]();
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while (true) {
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const res = [];
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for (let i = 0; i < chunksize; i++) {
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const next = iterator.next();
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if (next.done) {
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break;
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}
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res.push(next.value);
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}
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if (res.length) {
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yield res;
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} else {
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return;
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}
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}
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}
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}
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/**
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@ -20,6 +20,8 @@
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"From Octal",
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"To Base32",
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"From Base32",
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"To Base45",
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"From Base45",
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"To Base58",
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"From Base58",
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"To Base62",
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@ -0,0 +1,27 @@
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/**
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* Base45 resources.
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*
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* @author Thomas Weißschuh [thomas@t-8ch.de]
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* @copyright Crown Copyright 2021
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* @license Apache-2.0
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*/
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/**
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* Highlight to Base45
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*/
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export function highlightToBase45(pos, args) {
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pos[0].start = Math.floor(pos[0].start / 2) * 3;
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pos[0].end = Math.ceil(pos[0].end / 2) * 3;
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return pos;
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}
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/**
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* Highlight from Base45
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*/
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export function highlightFromBase45(pos, args) {
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pos[0].start = Math.floor(pos[0].start / 3) * 2;
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pos[0].end = Math.ceil(pos[0].end / 3) * 2;
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return pos;
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}
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export const ALPHABET = "0-9A-Z $%*+\\-./:";
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@ -0,0 +1,89 @@
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/**
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* @author Thomas Weißschuh [thomas@t-8ch.de]
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* @copyright Crown Copyright 2021
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* @license Apache-2.0
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*/
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import {ALPHABET, highlightToBase45, highlightFromBase45} from "../lib/Base45.mjs";
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import Utils from "../Utils.mjs";
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/**
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* From Base45 operation
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*/
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class FromBase45 extends Operation {
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/**
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* FromBase45 constructor
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*/
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constructor() {
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super();
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this.name = "From Base45";
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this.module = "Default";
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this.description = "Base45 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers. The high number base results in shorter strings than with the decimal or hexadecimal system. Base45 is optimized for usage with QR codes.";
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this.infoURL = "https://wikipedia.org/wiki/List_of_numeral_systems";
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this.inputType = "string";
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this.outputType = "byteArray";
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this.args = [
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{
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name: "Alphabet",
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type: "string",
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value: ALPHABET
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}
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];
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this.highlight = highlightFromBase45;
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this.highlightReverse = highlightToBase45;
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {byteArray}
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*/
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run(input, args) {
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if (!input) return [];
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const alphabet = Utils.expandAlphRange(args[0]);
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const res = [];
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for (const triple of Utils.chunked(input, 3)) {
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triple.reverse();
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let b = 0;
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for (const c of triple) {
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const idx = alphabet.indexOf(c);
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if (idx === -1) {
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throw new OperationError(`Character not in alphabet: '${c}'`);
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}
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b *= 45;
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b += idx;
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}
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if (b > 65535) {
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throw new OperationError(`Triplet too large: '${triple.join("")}'`);
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}
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if (triple.length > 2) {
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/**
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* The last triple may only have 2 bytes so we push the MSB when we got 3 bytes
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* Pushing MSB
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*/
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res.push(b >> 8);
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}
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/**
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* Pushing LSB
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*/
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res.push(b & 0xff);
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}
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return res;
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}
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}
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export default FromBase45;
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@ -0,0 +1,78 @@
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/**
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* @author Thomas Weißschuh [thomas@t-8ch.de]
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* @copyright Crown Copyright 2021
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* @license Apache-2.0
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*/
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import {ALPHABET, highlightToBase45, highlightFromBase45} from "../lib/Base45.mjs";
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import Operation from "../Operation.mjs";
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import Utils from "../Utils.mjs";
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/**
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* To Base45 operation
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*/
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class ToBase45 extends Operation {
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/**
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* ToBase45 constructor
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*/
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constructor() {
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super();
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this.name = "To Base45";
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this.module = "Default";
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this.description = "Base45 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers. The high number base results in shorter strings than with the decimal or hexadecimal system. Base45 is optimized for usage with QR codes.";
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this.infoURL = "https://wikipedia.org/wiki/List_of_numeral_systems";
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this.inputType = "ArrayBuffer";
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this.outputType = "string";
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this.args = [
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{
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name: "Alphabet",
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type: "string",
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value: ALPHABET
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}
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];
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this.highlight = highlightToBase45;
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this.highlightReverse = highlightFromBase45;
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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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input = new Uint8Array(input);
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const alphabet = Utils.expandAlphRange(args[0]);
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if (!input) return "";
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const res = [];
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for (const pair of Utils.chunked(input, 2)) {
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let b = 0;
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for (const e of pair) {
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b *= 256;
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b += e;
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}
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let chars = 0;
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do {
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res.push(alphabet[b % 45]);
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chars++;
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b = Math.floor(b / 45);
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} while (b > 0);
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if (chars < 2) {
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res.push("0");
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}
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}
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return res.join("");
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}
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}
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export default ToBase45;
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@ -20,6 +20,7 @@ import TestRegister from "../lib/TestRegister.mjs";
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import "./tests/BCD.mjs";
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import "./tests/BSON.mjs";
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import "./tests/BaconCipher.mjs";
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import "./tests/Base45.mjs";
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import "./tests/Base58.mjs";
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import "./tests/Base64.mjs";
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import "./tests/Base62.mjs";
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@ -0,0 +1,103 @@
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/**
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* Base45 tests.
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*
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* @author Thomas Weißschuh [thomas@t-8ch.de]
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*
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* @copyright Crown Copyright 2021
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* @license Apache-2.0
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*/
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import TestRegister from "../../lib/TestRegister.mjs";
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const defaultB45Alph = "0-9A-Z $%*+\\-./:";
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TestRegister.addTests([
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{
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name: "To Base45: nothing",
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input: "",
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expectedOutput: "",
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recipeConfig: [
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{
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op: "To Base45",
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args: [defaultB45Alph],
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},
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],
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},
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{
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name: "To Base45: Spec encoding example 1",
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input: "AB",
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expectedOutput: "BB8",
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recipeConfig: [
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{
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op: "To Base45",
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args: [defaultB45Alph],
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},
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],
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},
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{
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name: "To Base45: Spec encoding example 2",
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input: "Hello!!",
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expectedOutput: "%69 VD92EX0",
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recipeConfig: [
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{
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op: "To Base45",
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args: [defaultB45Alph],
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},
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],
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},
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{
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name: "To Base45: Spec encoding example 3",
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input: "base-45",
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expectedOutput: "UJCLQE7W581",
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recipeConfig: [
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{
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op: "To Base45",
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args: [defaultB45Alph],
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},
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],
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},
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{
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name: "From Base45: nothing",
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input: "",
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expectedOutput: "",
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recipeConfig: [
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{
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op: "From Base45",
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args: [defaultB45Alph],
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},
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],
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},
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{
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name: "From Base45: Spec decoding example 1",
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input: "QED8WEX0",
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expectedOutput: "ietf!",
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recipeConfig: [
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{
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op: "From Base45",
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args: [defaultB45Alph],
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},
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],
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},
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{
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name: "From Base45: Invalid character",
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input: "!",
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expectedOutput: "Character not in alphabet: '!'",
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recipeConfig: [
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{
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op: "From Base45",
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args: [defaultB45Alph],
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},
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],
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},
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{
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name: "From Base45: Invalid triplet value",
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input: "ZZZ",
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expectedOutput: "Triplet too large: 'ZZZ'",
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recipeConfig: [
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{
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op: "From Base45",
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args: [defaultB45Alph],
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},
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],
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},
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]);
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