CyberChef/src/core/operations/ToBase58.mjs

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/**
* @author tlwr [toby@toby.codes]
* @copyright Crown Copyright 2017
* @license Apache-2.0
*/
import Operation from "../Operation";
import Utils from "../Utils";
import OperationError from "../errors/OperationError";
import {ALPHABET_OPTIONS} from "../lib/Base58";
/**
* To Base58 operation
*/
class ToBase58 extends Operation {
/**
* ToBase58 constructor
*/
constructor() {
super();
this.name = "To Base58";
this.module = "Default";
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).";
this.infoURL = "https://wikipedia.org/wiki/Base58";
this.inputType = "byteArray";
this.outputType = "string";
this.args = [
{
"name": "Alphabet",
"type": "editableOption",
"value": ALPHABET_OPTIONS
}
];
}
/**
* @param {byteArray} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
let alphabet = args[0] || ALPHABET_OPTIONS[0].value,
result = [0];
alphabet = Utils.expandAlphRange(alphabet).join("");
if (alphabet.length !== 58 ||
[].unique.call(alphabet).length !== 58) {
throw new OperationError("Error: alphabet must be of length 58");
}
if (input.length === 0) return "";
input.forEach(function(b) {
let carry = (result[0] << 8) + b;
result[0] = carry % 58;
carry = (carry / 58) | 0;
for (let i = 1; i < result.length; i++) {
carry += result[i] << 8;
result[i] = carry % 58;
carry = (carry / 58) | 0;
}
while (carry > 0) {
result.push(carry % 58);
carry = (carry / 58) | 0;
}
});
result = result.map(function(b) {
return alphabet[b];
}).reverse().join("");
while (result.length < input.length) {
result = alphabet[0] + result;
}
return result;
}
}
export default ToBase58;