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@ -1,14 +1,59 @@
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/* eslint-disable camelcase */
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import crc32 from 'buffer-crc32';
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class MnemonicError extends Error {}
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class MnemonicError extends Error {
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constructor(message: string) {
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super(message);
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// restore prototype chain
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Object.setPrototypeOf(this, MnemonicError.prototype);
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}
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}
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export class NotEnoughWordsError extends MnemonicError {
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constructor() {
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super("You've entered too few words, please try again");
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// restore prototype chain
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Object.setPrototypeOf(this, NotEnoughWordsError.prototype);
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}
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}
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export class InvalidWordsError extends MnemonicError {
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constructor() {
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super('invalid word in mnemonic');
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// restore prototype chain
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Object.setPrototypeOf(this, InvalidWordsError.prototype);
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}
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}
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export class LastWordMissingError extends MnemonicError {
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constructor() {
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super('You seem to be missing the last word in your private key, please try again');
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// restore prototype chain
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Object.setPrototypeOf(this, LastWordMissingError.prototype);
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}
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}
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export class DecodingError extends MnemonicError {
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constructor() {
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super('Something went wrong when decoding your private key, please try again');
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// restore prototype chain
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Object.setPrototypeOf(this, DecodingError.prototype);
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}
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}
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export class VerificationError extends MnemonicError {
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constructor() {
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super('Your private key could not be verified, please verify the checksum word');
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// restore prototype chain
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Object.setPrototypeOf(this, VerificationError.prototype);
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}
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}
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/*
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mnemonic.js : Converts between 4-byte aligned strings and a human-readable
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mnemonic.ts : Converts between 4-byte aligned strings and a human-readable
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sequence of words. Uses 1626 common words taken from wikipedia article:
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http://en.wiktionary.org/wiki/Wiktionary:Frequency_lists/Contemporary_poetry
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Originally written in python special for Electrum (lightweight Bitcoin client).
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This version has been reimplemented in javascript and placed in public domain.
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This version has been reimplemented in javascript and placed in public domain and has further been converted to TypeScript as part of the Session project.
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*/
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const MN_DEFAULT_WORDSET = 'english';
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@ -60,18 +105,16 @@ export function mnDecode(str: string, wordsetName: string = MN_DEFAULT_WORDSET):
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const wlist = str.split(' ');
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let checksumWord = '';
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if (wlist.length < 12) {
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throw new MnemonicError("You've entered too few words, please try again");
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throw new NotEnoughWordsError();
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}
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if (
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(wordset.prefixLen === 0 && wlist.length % 3 !== 0) ||
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(wordset.prefixLen > 0 && wlist.length % 3 === 2)
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) {
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throw new MnemonicError("You've entered too few words, please try again");
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throw new NotEnoughWordsError();
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}
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if (wordset.prefixLen > 0 && wlist.length % 3 === 0) {
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throw new MnemonicError(
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'You seem to be missing the last word in your private key, please try again'
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);
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throw new LastWordMissingError();
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}
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if (wordset.prefixLen > 0) {
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// Pop checksum from mnemonic
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@ -92,14 +135,12 @@ export function mnDecode(str: string, wordsetName: string = MN_DEFAULT_WORDSET):
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w3 = wordset.truncWords.indexOf(wlist[i + 2].slice(0, wordset.prefixLen));
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}
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if (w1 === -1 || w2 === -1 || w3 === -1) {
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throw new MnemonicError('invalid word in mnemonic');
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throw new InvalidWordsError();
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}
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const x = w1 + n * ((n - w1 + w2) % n) + n * n * ((n - w2 + w3) % n);
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if (x % n !== w1) {
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throw new MnemonicError(
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'Something went wrong when decoding your private key, please try again'
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);
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throw new DecodingError();
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}
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out += mn_swap_endian_4byte(`0000000${x.toString(16)}`.slice(-8));
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}
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@ -110,9 +151,7 @@ export function mnDecode(str: string, wordsetName: string = MN_DEFAULT_WORDSET):
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if (
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expectedChecksumWord.slice(0, wordset.prefixLen) !== checksumWord.slice(0, wordset.prefixLen)
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) {
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throw new MnemonicError(
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'Your private key could not be verified, please verify the checksum word'
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);
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throw new VerificationError();
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}
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}
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return out;
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William Grant
1 year ago