mirror of https://github.com/gchq/CyberChef.git
107 lines
3.3 KiB
JavaScript
107 lines
3.3 KiB
JavaScript
/**
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* @author tlwr [toby@toby.codes]
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* @copyright Crown Copyright 2017
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* @license Apache-2.0
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*/
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import Operation from "../Operation";
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import Utils from "../Utils";
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import OperationError from "../errors/OperationError";
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import {ALPHABET_OPTIONS} from "../lib/Base58";
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/**
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* From Base58 operation
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*/
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class FromBase58 extends Operation {
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/**
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* FromBase58 constructor
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*/
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constructor() {
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super();
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this.name = "From Base58";
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this.module = "Default";
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this.description = "Base58 (similar to Base64) is a notation for encoding arbitrary byte data. It differs from Base64 by removing easily misread characters (i.e. l, I, 0 and O) to improve human readability.<br><br>This operation decodes data from an ASCII string (with an alphabet of your choosing, presets included) back into its raw form.<br><br>e.g. <code>StV1DL6CwTryKyV</code> becomes <code>hello world</code><br><br>Base58 is commonly used in cryptocurrencies (Bitcoin, Ripple, etc).";
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this.infoURL = "https://wikipedia.org/wiki/Base58";
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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": "editableOption",
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"value": ALPHABET_OPTIONS
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},
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{
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"name": "Remove non-alphabet chars",
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"type": "boolean",
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"value": true
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}
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];
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this.patterns = [
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{
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match: "^[1-9A-HJ-NP-Za-km-z]{20,}$",
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flags: "",
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args: ["123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz", false]
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},
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{
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match: "^[1-9A-HJ-NP-Za-km-z]{20,}$",
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flags: "",
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args: ["rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz", false]
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},
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];
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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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let alphabet = args[0] || ALPHABET_OPTIONS[0].value;
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const removeNonAlphaChars = args[1] === undefined ? true : args[1],
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result = [0];
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alphabet = Utils.expandAlphRange(alphabet).join("");
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if (alphabet.length !== 58 ||
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[].unique.call(alphabet).length !== 58) {
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throw new OperationError("Alphabet must be of length 58");
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}
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if (input.length === 0) return [];
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[].forEach.call(input, function(c, charIndex) {
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const index = alphabet.indexOf(c);
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if (index === -1) {
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if (removeNonAlphaChars) {
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return;
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} else {
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throw new OperationError(`Char '${c}' at position ${charIndex} not in alphabet`);
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}
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}
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let carry = result[0] * 58 + index;
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result[0] = carry & 0xFF;
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carry = carry >> 8;
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for (let i = 1; i < result.length; i++) {
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carry += result[i] * 58;
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result[i] = carry & 0xFF;
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carry = carry >> 8;
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}
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while (carry > 0) {
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result.push(carry & 0xFF);
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carry = carry >> 8;
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}
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});
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return result.reverse();
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}
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}
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export default FromBase58;
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