109 lines
3.1 KiB
JavaScript
109 lines
3.1 KiB
JavaScript
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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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import scrypt from 'scryptsy';
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import Transaction from 'ethereumjs-tx';
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import { pbkdf2Sync } from 'crypto';
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import { createDecipheriv } from 'browserify-aes';
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import { inHex } from '~/api/format/input';
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import { sha3 } from '~/api/util/sha3';
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// Adapted from https://github.com/kvhnuke/etherwallet/blob/mercury/app/scripts/myetherwallet.js
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export class Signer {
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static fromJson (json, password) {
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return Signer
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.getSeed(json, password)
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.then((seed) => {
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return new Signer(seed);
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});
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}
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static getSeed (json, password) {
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try {
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const seed = Signer.getSyncSeed(json, password);
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return Promise.resolve(seed);
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} catch (error) {
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return Promise.reject(error);
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}
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}
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static getSyncSeed (json, password) {
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if (json.version !== 3) {
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throw new Error('Only V3 wallets are supported');
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}
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const { kdf } = json.crypto;
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const kdfparams = json.crypto.kdfparams || {};
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const pwd = Buffer.from(password);
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const salt = Buffer.from(kdfparams.salt, 'hex');
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let derivedKey;
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if (kdf === 'scrypt') {
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derivedKey = scrypt(pwd, salt, kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen);
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} else if (kdf === 'pbkdf2') {
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if (kdfparams.prf !== 'hmac-sha256') {
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throw new Error('Unsupported parameters to PBKDF2');
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}
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derivedKey = pbkdf2Sync(pwd, salt, kdfparams.c, kdfparams.dklen, 'sha256');
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} else {
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throw new Error('Unsupported key derivation scheme');
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}
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const ciphertext = Buffer.from(json.crypto.ciphertext, 'hex');
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const mac = sha3(Buffer.concat([derivedKey.slice(16, 32), ciphertext]));
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if (mac !== inHex(json.crypto.mac)) {
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throw new Error('Key derivation failed - possibly wrong password');
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}
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const decipher = createDecipheriv(
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json.crypto.cipher,
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derivedKey.slice(0, 16),
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Buffer.from(json.crypto.cipherparams.iv, 'hex')
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);
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let seed = Buffer.concat([decipher.update(ciphertext), decipher.final()]);
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while (seed.length < 32) {
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const nullBuff = Buffer.from([0x00]);
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seed = Buffer.concat([nullBuff, seed]);
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}
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return seed;
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}
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constructor (seed) {
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this.seed = seed;
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}
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signTransactionObject (tx) {
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tx.sign(this.seed);
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return tx;
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}
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signTransaction (transaction) {
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const tx = new Transaction(transaction);
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return inHex(this.signTransactionObject(tx).serialize().toString('hex'));
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}
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}
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