285 lines
12 KiB
JavaScript
285 lines
12 KiB
JavaScript
"use strict";
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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import aes from "aes-js";
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import * as scrypt from "scrypt-js";
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import uuid from "uuid";
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import { getAddress } from "@ethersproject/address";
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import { arrayify, concat, hexlify } from "@ethersproject/bytes";
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import { defaultPath, entropyToMnemonic, HDNode, mnemonicToEntropy } from "@ethersproject/hdnode";
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import { keccak256 } from "@ethersproject/keccak256";
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import { pbkdf2 } from "@ethersproject/pbkdf2";
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import { randomBytes } from "@ethersproject/random";
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import { Description } from "@ethersproject/properties";
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import { computeAddress } from "@ethersproject/transactions";
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import { getPassword, looseArrayify, searchPath, zpad } from "./utils";
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export class KeystoreAccount extends Description {
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isKeystoreAccount(value) {
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return !!(value && value._isKeystoreAccount);
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}
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}
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export function decrypt(json, password, progressCallback) {
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return __awaiter(this, void 0, void 0, function* () {
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const data = JSON.parse(json);
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const passwordBytes = getPassword(password);
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const decrypt = function (key, ciphertext) {
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const cipher = searchPath(data, "crypto/cipher");
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if (cipher === "aes-128-ctr") {
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const iv = looseArrayify(searchPath(data, "crypto/cipherparams/iv"));
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const counter = new aes.Counter(iv);
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const aesCtr = new aes.ModeOfOperation.ctr(key, counter);
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return arrayify(aesCtr.decrypt(ciphertext));
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}
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return null;
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};
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const computeMAC = function (derivedHalf, ciphertext) {
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return keccak256(concat([derivedHalf, ciphertext]));
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};
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const getAccount = function (key) {
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return __awaiter(this, void 0, void 0, function* () {
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const ciphertext = looseArrayify(searchPath(data, "crypto/ciphertext"));
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const computedMAC = hexlify(computeMAC(key.slice(16, 32), ciphertext)).substring(2);
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if (computedMAC !== searchPath(data, "crypto/mac").toLowerCase()) {
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throw new Error("invalid password");
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}
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const privateKey = decrypt(key.slice(0, 16), ciphertext);
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const mnemonicKey = key.slice(32, 64);
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if (!privateKey) {
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throw new Error("unsupported cipher");
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}
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const address = computeAddress(privateKey);
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if (data.address) {
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let check = data.address.toLowerCase();
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if (check.substring(0, 2) !== "0x") {
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check = "0x" + check;
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}
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if (getAddress(check) !== address) {
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throw new Error("address mismatch");
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}
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}
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const account = {
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_isKeystoreAccount: true,
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address: address,
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privateKey: hexlify(privateKey)
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};
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// Version 0.1 x-ethers metadata must contain an encrypted mnemonic phrase
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if (searchPath(data, "x-ethers/version") === "0.1") {
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const mnemonicCiphertext = looseArrayify(searchPath(data, "x-ethers/mnemonicCiphertext"));
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const mnemonicIv = looseArrayify(searchPath(data, "x-ethers/mnemonicCounter"));
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const mnemonicCounter = new aes.Counter(mnemonicIv);
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const mnemonicAesCtr = new aes.ModeOfOperation.ctr(mnemonicKey, mnemonicCounter);
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const path = searchPath(data, "x-ethers/path") || defaultPath;
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const entropy = arrayify(mnemonicAesCtr.decrypt(mnemonicCiphertext));
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const mnemonic = entropyToMnemonic(entropy);
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const node = HDNode.fromMnemonic(mnemonic).derivePath(path);
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if (node.privateKey != account.privateKey) {
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throw new Error("mnemonic mismatch");
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}
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account.mnemonic = node.mnemonic;
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account.path = node.path;
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}
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return new KeystoreAccount(account);
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});
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};
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const kdf = searchPath(data, "crypto/kdf");
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if (kdf && typeof (kdf) === "string") {
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if (kdf.toLowerCase() === "scrypt") {
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const salt = looseArrayify(searchPath(data, "crypto/kdfparams/salt"));
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const N = parseInt(searchPath(data, "crypto/kdfparams/n"));
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const r = parseInt(searchPath(data, "crypto/kdfparams/r"));
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const p = parseInt(searchPath(data, "crypto/kdfparams/p"));
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if (!N || !r || !p) {
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throw new Error("unsupported key-derivation function parameters");
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}
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// Make sure N is a power of 2
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if ((N & (N - 1)) !== 0) {
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throw new Error("unsupported key-derivation function parameter value for N");
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}
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const dkLen = parseInt(searchPath(data, "crypto/kdfparams/dklen"));
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if (dkLen !== 32) {
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throw new Error("unsupported key-derivation derived-key length");
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}
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const key = yield scrypt.scrypt(passwordBytes, salt, N, r, p, 64, progressCallback);
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//key = arrayify(key);
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return getAccount(key);
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}
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else if (kdf.toLowerCase() === "pbkdf2") {
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const salt = looseArrayify(searchPath(data, "crypto/kdfparams/salt"));
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let prfFunc = null;
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const prf = searchPath(data, "crypto/kdfparams/prf");
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if (prf === "hmac-sha256") {
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prfFunc = "sha256";
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}
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else if (prf === "hmac-sha512") {
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prfFunc = "sha512";
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}
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else {
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throw new Error("unsupported prf");
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}
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const c = parseInt(searchPath(data, "crypto/kdfparams/c"));
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const dkLen = parseInt(searchPath(data, "crypto/kdfparams/dklen"));
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if (dkLen !== 32) {
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throw new Error("unsupported key-derivation derived-key length");
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}
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const key = arrayify(pbkdf2(passwordBytes, salt, c, dkLen, prfFunc));
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return getAccount(key);
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}
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}
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throw new Error("unsupported key-derivation function");
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});
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}
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export function encrypt(account, password, options, progressCallback) {
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try {
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if (getAddress(account.address) !== computeAddress(account.privateKey)) {
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throw new Error("address/privateKey mismatch");
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}
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if (account.mnemonic != null) {
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const node = HDNode.fromMnemonic(account.mnemonic).derivePath(account.path || defaultPath);
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if (node.privateKey != account.privateKey) {
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throw new Error("mnemonic mismatch");
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}
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}
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else if (account.path != null) {
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throw new Error("cannot specify path without mnemonic");
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}
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}
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catch (e) {
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return Promise.reject(e);
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}
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// the options are optional, so adjust the call as needed
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if (typeof (options) === "function" && !progressCallback) {
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progressCallback = options;
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options = {};
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}
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if (!options) {
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options = {};
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}
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const privateKey = arrayify(account.privateKey);
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const passwordBytes = getPassword(password);
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let entropy = null;
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let path = account.path;
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if (account.mnemonic) {
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entropy = arrayify(mnemonicToEntropy(account.mnemonic));
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if (!path) {
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path = defaultPath;
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}
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}
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let client = options.client;
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if (!client) {
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client = "ethers.js";
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}
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// Check/generate the salt
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let salt = null;
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if (options.salt) {
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salt = arrayify(options.salt);
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}
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else {
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salt = randomBytes(32);
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;
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}
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// Override initialization vector
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let iv = null;
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if (options.iv) {
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iv = arrayify(options.iv);
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if (iv.length !== 16) {
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throw new Error("invalid iv");
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}
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}
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else {
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iv = randomBytes(16);
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}
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// Override the uuid
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let uuidRandom = null;
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if (options.uuid) {
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uuidRandom = arrayify(options.uuid);
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if (uuidRandom.length !== 16) {
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throw new Error("invalid uuid");
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}
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}
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else {
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uuidRandom = randomBytes(16);
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}
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// Override the scrypt password-based key derivation function parameters
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let N = (1 << 17), r = 8, p = 1;
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if (options.scrypt) {
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if (options.scrypt.N) {
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N = options.scrypt.N;
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}
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if (options.scrypt.r) {
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r = options.scrypt.r;
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}
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if (options.scrypt.p) {
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p = options.scrypt.p;
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}
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}
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// We take 64 bytes:
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// - 32 bytes As normal for the Web3 secret storage (derivedKey, macPrefix)
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// - 32 bytes AES key to encrypt mnemonic with (required here to be Ethers Wallet)
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return scrypt.scrypt(passwordBytes, salt, N, r, p, 64, progressCallback).then((key) => {
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key = arrayify(key);
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// This will be used to encrypt the wallet (as per Web3 secret storage)
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const derivedKey = key.slice(0, 16);
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const macPrefix = key.slice(16, 32);
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// This will be used to encrypt the mnemonic phrase (if any)
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const mnemonicKey = key.slice(32, 64);
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// Encrypt the private key
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const counter = new aes.Counter(iv);
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const aesCtr = new aes.ModeOfOperation.ctr(derivedKey, counter);
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const ciphertext = arrayify(aesCtr.encrypt(privateKey));
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// Compute the message authentication code, used to check the password
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const mac = keccak256(concat([macPrefix, ciphertext]));
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// See: https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition
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const data = {
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address: account.address.substring(2).toLowerCase(),
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id: uuid.v4({ random: uuidRandom }),
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version: 3,
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Crypto: {
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cipher: "aes-128-ctr",
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cipherparams: {
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iv: hexlify(iv).substring(2),
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},
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ciphertext: hexlify(ciphertext).substring(2),
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kdf: "scrypt",
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kdfparams: {
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salt: hexlify(salt).substring(2),
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n: N,
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dklen: 32,
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p: p,
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r: r
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},
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mac: mac.substring(2)
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}
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};
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// If we have a mnemonic, encrypt it into the JSON wallet
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if (entropy) {
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const mnemonicIv = randomBytes(16);
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const mnemonicCounter = new aes.Counter(mnemonicIv);
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const mnemonicAesCtr = new aes.ModeOfOperation.ctr(mnemonicKey, mnemonicCounter);
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const mnemonicCiphertext = arrayify(mnemonicAesCtr.encrypt(entropy));
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const now = new Date();
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const timestamp = (now.getUTCFullYear() + "-" +
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zpad(now.getUTCMonth() + 1, 2) + "-" +
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zpad(now.getUTCDate(), 2) + "T" +
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zpad(now.getUTCHours(), 2) + "-" +
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zpad(now.getUTCMinutes(), 2) + "-" +
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zpad(now.getUTCSeconds(), 2) + ".0Z");
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data["x-ethers"] = {
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client: client,
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gethFilename: ("UTC--" + timestamp + "--" + data.address),
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mnemonicCounter: hexlify(mnemonicIv).substring(2),
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mnemonicCiphertext: hexlify(mnemonicCiphertext).substring(2),
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path: path,
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version: "0.1"
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};
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}
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return JSON.stringify(data);
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});
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}
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