mirror of https://github.com/gchq/CyberChef.git
91 lines
2.6 KiB
JavaScript
91 lines
2.6 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.mjs";
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import Utils from "../Utils.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import {ALPHABET_OPTIONS} from "../lib/Base58.mjs";
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/**
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* To Base58 operation
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*/
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class ToBase58 extends Operation {
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/**
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* ToBase58 constructor
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*/
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constructor() {
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super();
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this.name = "To 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 encodes data in an ASCII string (with an alphabet of your choosing, presets included).<br><br>e.g. <code>hello world</code> becomes <code>StV1DL6CwTryKyV</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 = "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": "editableOption",
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"value": ALPHABET_OPTIONS
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}
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];
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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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let alphabet = args[0] || ALPHABET_OPTIONS[0].value,
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result = [];
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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("Error: alphabet must be of length 58");
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}
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if (input.length === 0) return "";
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let zeroPrefix = 0;
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for (let i = 0; i < input.length && input[i] === 0; i++) {
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zeroPrefix++;
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}
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input.forEach(function(b) {
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let carry = b;
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for (let i = 0; i < result.length; i++) {
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carry += result[i] << 8;
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result[i] = carry % 58;
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carry = (carry / 58) | 0;
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}
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while (carry > 0) {
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result.push(carry % 58);
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carry = (carry / 58) | 0;
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}
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});
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result = result.map(function(b) {
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return alphabet[b];
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}).reverse().join("");
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while (zeroPrefix--) {
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result = alphabet[0] + result;
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}
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return result;
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}
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}
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export default ToBase58;
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