498 lines
18 KiB
JavaScript
498 lines
18 KiB
JavaScript
/**
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* Explain HD Wallets..
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*
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* @_subsection: api/wallet:HD Wallets [hd-wallets]
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*/
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import { computeHmac, randomBytes, ripemd160, SigningKey, sha256 } from "../crypto/index.js";
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import { VoidSigner } from "../providers/index.js";
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import { computeAddress } from "../transaction/index.js";
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import { concat, dataSlice, decodeBase58, defineProperties, encodeBase58, getBytes, hexlify, isBytesLike, getNumber, toArray, toBigInt, toHex, assertPrivate, assert, assertArgument } from "../utils/index.js";
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import { LangEn } from "../wordlists/lang-en.js";
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import { BaseWallet } from "./base-wallet.js";
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import { Mnemonic } from "./mnemonic.js";
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import { encryptKeystoreJson, encryptKeystoreJsonSync, } from "./json-keystore.js";
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/**
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* The default derivation path for Ethereum HD Nodes. (i.e. ``"m/44'/60'/0'/0/0"``)
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*/
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export const defaultPath = "m/44'/60'/0'/0/0";
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// "Bitcoin seed"
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const MasterSecret = new Uint8Array([66, 105, 116, 99, 111, 105, 110, 32, 115, 101, 101, 100]);
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const HardenedBit = 0x80000000;
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const N = BigInt("0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141");
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const Nibbles = "0123456789abcdef";
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function zpad(value, length) {
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let result = "";
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while (value) {
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result = Nibbles[value % 16] + result;
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value = Math.trunc(value / 16);
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}
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while (result.length < length * 2) {
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result = "0" + result;
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}
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return "0x" + result;
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}
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function encodeBase58Check(_value) {
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const value = getBytes(_value);
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const check = dataSlice(sha256(sha256(value)), 0, 4);
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const bytes = concat([value, check]);
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return encodeBase58(bytes);
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}
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const _guard = {};
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function ser_I(index, chainCode, publicKey, privateKey) {
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const data = new Uint8Array(37);
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if (index & HardenedBit) {
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assert(privateKey != null, "cannot derive child of neutered node", "UNSUPPORTED_OPERATION", {
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operation: "deriveChild"
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});
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// Data = 0x00 || ser_256(k_par)
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data.set(getBytes(privateKey), 1);
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}
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else {
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// Data = ser_p(point(k_par))
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data.set(getBytes(publicKey));
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}
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// Data += ser_32(i)
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for (let i = 24; i >= 0; i -= 8) {
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data[33 + (i >> 3)] = ((index >> (24 - i)) & 0xff);
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}
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const I = getBytes(computeHmac("sha512", chainCode, data));
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return { IL: I.slice(0, 32), IR: I.slice(32) };
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}
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function derivePath(node, path) {
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const components = path.split("/");
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assertArgument(components.length > 0 && (components[0] === "m" || node.depth > 0), "invalid path", "path", path);
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if (components[0] === "m") {
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components.shift();
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}
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let result = node;
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for (let i = 0; i < components.length; i++) {
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const component = components[i];
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if (component.match(/^[0-9]+'$/)) {
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const index = parseInt(component.substring(0, component.length - 1));
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assertArgument(index < HardenedBit, "invalid path index", `path[${i}]`, component);
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result = result.deriveChild(HardenedBit + index);
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}
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else if (component.match(/^[0-9]+$/)) {
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const index = parseInt(component);
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assertArgument(index < HardenedBit, "invalid path index", `path[${i}]`, component);
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result = result.deriveChild(index);
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}
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else {
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assertArgument(false, "invalid path component", `path[${i}]`, component);
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}
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}
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return result;
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}
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/**
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* An **HDNodeWallet** is a [[Signer]] backed by the private key derived
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* from an HD Node using the [[link-bip-32]] stantard.
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*
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* An HD Node forms a hierarchal structure with each HD Node having a
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* private key and the ability to derive child HD Nodes, defined by
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* a path indicating the index of each child.
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*/
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export class HDNodeWallet extends BaseWallet {
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/**
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* The compressed public key.
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*/
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publicKey;
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/**
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* The fingerprint.
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*
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* A fingerprint allows quick qay to detect parent and child nodes,
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* but developers should be prepared to deal with collisions as it
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* is only 4 bytes.
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*/
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fingerprint;
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/**
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* The parent fingerprint.
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*/
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parentFingerprint;
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/**
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* The mnemonic used to create this HD Node, if available.
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*
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* Sources such as extended keys do not encode the mnemonic, in
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* which case this will be ``null``.
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*/
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mnemonic;
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/**
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* The chaincode, which is effectively a public key used
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* to derive children.
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*/
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chainCode;
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/**
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* The derivation path of this wallet.
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*
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* Since extended keys do not provider full path details, this
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* may be ``null``, if instantiated from a source that does not
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* enocde it.
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*/
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path;
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/**
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* The child index of this wallet. Values over ``2 *\* 31`` indicate
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* the node is hardened.
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*/
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index;
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/**
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* The depth of this wallet, which is the number of components
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* in its path.
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*/
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depth;
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/**
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* @private
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*/
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constructor(guard, signingKey, parentFingerprint, chainCode, path, index, depth, mnemonic, provider) {
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super(signingKey, provider);
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assertPrivate(guard, _guard, "HDNodeWallet");
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defineProperties(this, { publicKey: signingKey.compressedPublicKey });
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const fingerprint = dataSlice(ripemd160(sha256(this.publicKey)), 0, 4);
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defineProperties(this, {
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parentFingerprint, fingerprint,
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chainCode, path, index, depth
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});
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defineProperties(this, { mnemonic });
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}
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connect(provider) {
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return new HDNodeWallet(_guard, this.signingKey, this.parentFingerprint, this.chainCode, this.path, this.index, this.depth, this.mnemonic, provider);
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}
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#account() {
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const account = { address: this.address, privateKey: this.privateKey };
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const m = this.mnemonic;
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if (this.path && m && m.wordlist.locale === "en" && m.password === "") {
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account.mnemonic = {
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path: this.path,
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locale: "en",
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entropy: m.entropy
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};
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}
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return account;
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}
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/**
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* Resolves to a [JSON Keystore Wallet](json-wallets) encrypted with
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* %%password%%.
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*
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* If %%progressCallback%% is specified, it will receive periodic
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* updates as the encryption process progreses.
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*/
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async encrypt(password, progressCallback) {
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return await encryptKeystoreJson(this.#account(), password, { progressCallback });
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}
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/**
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* Returns a [JSON Keystore Wallet](json-wallets) encryped with
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* %%password%%.
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*
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* It is preferred to use the [async version](encrypt) instead,
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* which allows a [[ProgressCallback]] to keep the user informed.
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*
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* This method will block the event loop (freezing all UI) until
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* it is complete, which may be a non-trivial duration.
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*/
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encryptSync(password) {
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return encryptKeystoreJsonSync(this.#account(), password);
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}
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/**
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* The extended key.
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*
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* This key will begin with the prefix ``xpriv`` and can be used to
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* reconstruct this HD Node to derive its children.
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*/
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get extendedKey() {
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// We only support the mainnet values for now, but if anyone needs
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// testnet values, let me know. I believe current sentiment is that
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// we should always use mainnet, and use BIP-44 to derive the network
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// - Mainnet: public=0x0488B21E, private=0x0488ADE4
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// - Testnet: public=0x043587CF, private=0x04358394
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assert(this.depth < 256, "Depth too deep", "UNSUPPORTED_OPERATION", { operation: "extendedKey" });
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return encodeBase58Check(concat([
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"0x0488ADE4", zpad(this.depth, 1), this.parentFingerprint,
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zpad(this.index, 4), this.chainCode,
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concat(["0x00", this.privateKey])
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]));
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}
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/**
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* Returns true if this wallet has a path, providing a Type Guard
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* that the path is non-null.
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*/
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hasPath() { return (this.path != null); }
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/**
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* Returns a neutered HD Node, which removes the private details
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* of an HD Node.
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*
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* A neutered node has no private key, but can be used to derive
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* child addresses and other public data about the HD Node.
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*/
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neuter() {
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return new HDNodeVoidWallet(_guard, this.address, this.publicKey, this.parentFingerprint, this.chainCode, this.path, this.index, this.depth, this.provider);
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}
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/**
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* Return the child for %%index%%.
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*/
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deriveChild(_index) {
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const index = getNumber(_index, "index");
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assertArgument(index <= 0xffffffff, "invalid index", "index", index);
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// Base path
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let path = this.path;
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if (path) {
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path += "/" + (index & ~HardenedBit);
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if (index & HardenedBit) {
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path += "'";
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}
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}
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const { IR, IL } = ser_I(index, this.chainCode, this.publicKey, this.privateKey);
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const ki = new SigningKey(toHex((toBigInt(IL) + BigInt(this.privateKey)) % N, 32));
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return new HDNodeWallet(_guard, ki, this.fingerprint, hexlify(IR), path, index, this.depth + 1, this.mnemonic, this.provider);
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}
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/**
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* Return the HDNode for %%path%% from this node.
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*/
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derivePath(path) {
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return derivePath(this, path);
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}
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static #fromSeed(_seed, mnemonic) {
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assertArgument(isBytesLike(_seed), "invalid seed", "seed", "[REDACTED]");
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const seed = getBytes(_seed, "seed");
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assertArgument(seed.length >= 16 && seed.length <= 64, "invalid seed", "seed", "[REDACTED]");
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const I = getBytes(computeHmac("sha512", MasterSecret, seed));
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const signingKey = new SigningKey(hexlify(I.slice(0, 32)));
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return new HDNodeWallet(_guard, signingKey, "0x00000000", hexlify(I.slice(32)), "m", 0, 0, mnemonic, null);
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}
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/**
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* Creates a new HD Node from %%extendedKey%%.
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*
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* If the %%extendedKey%% will either have a prefix or ``xpub`` or
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* ``xpriv``, returning a neutered HD Node ([[HDNodeVoidWallet]])
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* or full HD Node ([[HDNodeWallet) respectively.
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*/
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static fromExtendedKey(extendedKey) {
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const bytes = toArray(decodeBase58(extendedKey)); // @TODO: redact
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assertArgument(bytes.length === 82 || encodeBase58Check(bytes.slice(0, 78)) === extendedKey, "invalid extended key", "extendedKey", "[ REDACTED ]");
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const depth = bytes[4];
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const parentFingerprint = hexlify(bytes.slice(5, 9));
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const index = parseInt(hexlify(bytes.slice(9, 13)).substring(2), 16);
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const chainCode = hexlify(bytes.slice(13, 45));
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const key = bytes.slice(45, 78);
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switch (hexlify(bytes.slice(0, 4))) {
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// Public Key
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case "0x0488b21e":
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case "0x043587cf": {
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const publicKey = hexlify(key);
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return new HDNodeVoidWallet(_guard, computeAddress(publicKey), publicKey, parentFingerprint, chainCode, null, index, depth, null);
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}
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// Private Key
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case "0x0488ade4":
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case "0x04358394 ":
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if (key[0] !== 0) {
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break;
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}
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return new HDNodeWallet(_guard, new SigningKey(key.slice(1)), parentFingerprint, chainCode, null, index, depth, null, null);
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}
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assertArgument(false, "invalid extended key prefix", "extendedKey", "[ REDACTED ]");
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}
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/**
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* Creates a new random HDNode.
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*/
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static createRandom(password, path, wordlist) {
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if (password == null) {
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password = "";
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}
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if (path == null) {
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path = defaultPath;
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}
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if (wordlist == null) {
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wordlist = LangEn.wordlist();
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}
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const mnemonic = Mnemonic.fromEntropy(randomBytes(16), password, wordlist);
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return HDNodeWallet.#fromSeed(mnemonic.computeSeed(), mnemonic).derivePath(path);
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}
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/**
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* Create am HD Node from %%mnemonic%%.
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*/
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static fromMnemonic(mnemonic, path) {
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if (!path) {
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path = defaultPath;
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}
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return HDNodeWallet.#fromSeed(mnemonic.computeSeed(), mnemonic).derivePath(path);
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}
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/**
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* Creates an HD Node from a mnemonic %%phrase%%.
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*/
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static fromPhrase(phrase, password, path, wordlist) {
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if (password == null) {
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password = "";
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}
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if (path == null) {
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path = defaultPath;
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}
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if (wordlist == null) {
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wordlist = LangEn.wordlist();
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}
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const mnemonic = Mnemonic.fromPhrase(phrase, password, wordlist);
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return HDNodeWallet.#fromSeed(mnemonic.computeSeed(), mnemonic).derivePath(path);
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}
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/**
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* Creates an HD Node from a %%seed%%.
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*/
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static fromSeed(seed) {
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return HDNodeWallet.#fromSeed(seed, null);
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}
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}
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/**
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* A **HDNodeVoidWallet** cannot sign, but provides access to
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* the children nodes of a [[link-bip-32]] HD wallet addresses.
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*
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* The can be created by using an extended ``xpub`` key to
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* [[HDNodeWallet_fromExtendedKey]] or by
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* [nuetering](HDNodeWallet-neuter) a [[HDNodeWallet]].
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*/
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export class HDNodeVoidWallet extends VoidSigner {
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/**
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* The compressed public key.
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*/
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publicKey;
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/**
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* The fingerprint.
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*
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* A fingerprint allows quick qay to detect parent and child nodes,
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* but developers should be prepared to deal with collisions as it
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* is only 4 bytes.
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*/
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fingerprint;
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/**
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* The parent node fingerprint.
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*/
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parentFingerprint;
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/**
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* The chaincode, which is effectively a public key used
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* to derive children.
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*/
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chainCode;
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/**
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* The derivation path of this wallet.
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*
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* Since extended keys do not provider full path details, this
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* may be ``null``, if instantiated from a source that does not
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* enocde it.
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*/
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path;
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/**
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* The child index of this wallet. Values over ``2 *\* 31`` indicate
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* the node is hardened.
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*/
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index;
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/**
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* The depth of this wallet, which is the number of components
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* in its path.
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*/
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depth;
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/**
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* @private
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*/
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constructor(guard, address, publicKey, parentFingerprint, chainCode, path, index, depth, provider) {
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super(address, provider);
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assertPrivate(guard, _guard, "HDNodeVoidWallet");
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defineProperties(this, { publicKey });
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const fingerprint = dataSlice(ripemd160(sha256(publicKey)), 0, 4);
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defineProperties(this, {
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publicKey, fingerprint, parentFingerprint, chainCode, path, index, depth
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});
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}
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connect(provider) {
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return new HDNodeVoidWallet(_guard, this.address, this.publicKey, this.parentFingerprint, this.chainCode, this.path, this.index, this.depth, provider);
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}
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/**
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* The extended key.
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*
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* This key will begin with the prefix ``xpub`` and can be used to
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* reconstruct this neutered key to derive its children addresses.
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*/
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get extendedKey() {
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// We only support the mainnet values for now, but if anyone needs
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// testnet values, let me know. I believe current sentiment is that
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// we should always use mainnet, and use BIP-44 to derive the network
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// - Mainnet: public=0x0488B21E, private=0x0488ADE4
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// - Testnet: public=0x043587CF, private=0x04358394
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assert(this.depth < 256, "Depth too deep", "UNSUPPORTED_OPERATION", { operation: "extendedKey" });
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return encodeBase58Check(concat([
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"0x0488B21E",
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zpad(this.depth, 1),
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this.parentFingerprint,
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zpad(this.index, 4),
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this.chainCode,
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this.publicKey,
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]));
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}
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/**
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* Returns true if this wallet has a path, providing a Type Guard
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* that the path is non-null.
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*/
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hasPath() { return (this.path != null); }
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/**
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* Return the child for %%index%%.
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*/
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deriveChild(_index) {
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const index = getNumber(_index, "index");
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assertArgument(index <= 0xffffffff, "invalid index", "index", index);
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// Base path
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let path = this.path;
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if (path) {
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path += "/" + (index & ~HardenedBit);
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if (index & HardenedBit) {
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path += "'";
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}
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}
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const { IR, IL } = ser_I(index, this.chainCode, this.publicKey, null);
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const Ki = SigningKey.addPoints(IL, this.publicKey, true);
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const address = computeAddress(Ki);
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return new HDNodeVoidWallet(_guard, address, Ki, this.fingerprint, hexlify(IR), path, index, this.depth + 1, this.provider);
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}
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/**
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* Return the signer for %%path%% from this node.
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*/
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derivePath(path) {
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return derivePath(this, path);
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}
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}
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/*
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export class HDNodeWalletManager {
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#root: HDNodeWallet;
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constructor(phrase: string, password?: null | string, path?: null | string, locale?: null | Wordlist) {
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if (password == null) { password = ""; }
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if (path == null) { path = "m/44'/60'/0'/0"; }
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if (locale == null) { locale = LangEn.wordlist(); }
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this.#root = HDNodeWallet.fromPhrase(phrase, password, path, locale);
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}
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getSigner(index?: number): HDNodeWallet {
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return this.#root.deriveChild((index == null) ? 0: index);
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}
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}
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*/
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/**
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* Returns the [[link-bip-32]] path for the acount at %%index%%.
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*
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* This is the pattern used by wallets like Ledger.
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*
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* There is also an [alternate pattern](getIndexedAccountPath) used by
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* some software.
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*/
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export function getAccountPath(_index) {
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const index = getNumber(_index, "index");
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assertArgument(index >= 0 && index < HardenedBit, "invalid account index", "index", index);
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return `m/44'/60'/${index}'/0/0`;
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}
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/**
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* Returns the path using an alternative pattern for deriving accounts,
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* at %%index%%.
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*
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* This derivation path uses the //index// component rather than the
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* //account// component to derive sequential accounts.
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*
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* This is the pattern used by wallets like MetaMask.
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*/
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export function getIndexedAccountPath(_index) {
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const index = getNumber(_index, "index");
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assertArgument(index >= 0 && index < HardenedBit, "invalid account index", "index", index);
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return `m/44'/60'/0'/0/${index}`;
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}
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//# sourceMappingURL=hdwallet.js.map
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