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138 lines
3.3 KiB
JavaScript
Executable File
138 lines
3.3 KiB
JavaScript
Executable File
import Utils from "../Utils.js";
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/**
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* Base58 operations.
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*
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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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* @namespace
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*/
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const Base58 = {
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/**
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* @constant
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* @default
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*/
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ALPHABET_OPTIONS: [
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{
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name: "Bitcoin",
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value: "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz",
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},
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{
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name: "Ripple",
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value: "rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz",
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},
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],
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/**
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* @constant
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* @default
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*/
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REMOVE_NON_ALPH_CHARS: true,
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/**
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* To Base58 operation.
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*
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* @param {byteArray} input
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* @param {Object[]} args
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* @returns {string}
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*/
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runTo: function(input, args) {
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let alphabet = args[0] || Base58.ALPHABET_OPTIONS[0].value,
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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 ("Error: alphabet must be of length 58");
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}
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if (input.length === 0) return "";
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input.forEach(function(b) {
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let carry = (result[0] << 8) + b;
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result[0] = carry % 58;
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carry = (carry / 58) | 0;
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for (let i = 1; 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 (result.length < input.length) {
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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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* From Base58 operation.
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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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runFrom: function(input, args) {
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let alphabet = args[0] || Base58.ALPHABET_OPTIONS[0].value,
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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 ("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 ("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 Base58;
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