287 lines
12 KiB
JavaScript
287 lines
12 KiB
JavaScript
/**
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* The JSON Wallet formats allow a simple way to store the private
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* keys needed in Ethereum along with related information and allows
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* for extensible forms of encryption.
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*
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* These utilities facilitate decrypting and encrypting the most common
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* JSON Wallet formats.
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*
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* @_subsection: api/wallet:JSON Wallets [json-wallets]
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*/
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import { CTR } from "aes-js";
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import { getAddress } from "../address/index.js";
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import { keccak256, pbkdf2, randomBytes, scrypt, scryptSync } from "../crypto/index.js";
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import { computeAddress } from "../transaction/index.js";
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import { concat, getBytes, hexlify, uuidV4, assert, assertArgument } from "../utils/index.js";
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import { getPassword, spelunk, zpad } from "./utils.js";
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import { version } from "../_version.js";
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const defaultPath = "m/44'/60'/0'/0/0";
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/**
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* Returns true if %%json%% is a valid JSON Keystore Wallet.
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*/
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export function isKeystoreJson(json) {
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try {
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const data = JSON.parse(json);
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const version = ((data.version != null) ? parseInt(data.version) : 0);
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if (version === 3) {
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return true;
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}
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}
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catch (error) { }
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return false;
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}
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function decrypt(data, key, ciphertext) {
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const cipher = spelunk(data, "crypto.cipher:string");
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if (cipher === "aes-128-ctr") {
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const iv = spelunk(data, "crypto.cipherparams.iv:data!");
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const aesCtr = new CTR(key, iv);
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return hexlify(aesCtr.decrypt(ciphertext));
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}
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assert(false, "unsupported cipher", "UNSUPPORTED_OPERATION", {
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operation: "decrypt"
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});
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}
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function getAccount(data, _key) {
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const key = getBytes(_key);
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const ciphertext = spelunk(data, "crypto.ciphertext:data!");
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const computedMAC = hexlify(keccak256(concat([key.slice(16, 32), ciphertext]))).substring(2);
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assertArgument(computedMAC === spelunk(data, "crypto.mac:string!").toLowerCase(), "incorrect password", "password", "[ REDACTED ]");
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const privateKey = decrypt(data, key.slice(0, 16), ciphertext);
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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.startsWith("0x")) {
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check = "0x" + check;
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}
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assertArgument(getAddress(check) === address, "keystore address/privateKey mismatch", "address", data.address);
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}
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const account = { address, privateKey };
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// Version 0.1 x-ethers metadata must contain an encrypted mnemonic phrase
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const version = spelunk(data, "x-ethers.version:string");
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if (version === "0.1") {
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const mnemonicKey = key.slice(32, 64);
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const mnemonicCiphertext = spelunk(data, "x-ethers.mnemonicCiphertext:data!");
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const mnemonicIv = spelunk(data, "x-ethers.mnemonicCounter:data!");
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const mnemonicAesCtr = new CTR(mnemonicKey, mnemonicIv);
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account.mnemonic = {
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path: (spelunk(data, "x-ethers.path:string") || defaultPath),
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locale: (spelunk(data, "x-ethers.locale:string") || "en"),
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entropy: hexlify(getBytes(mnemonicAesCtr.decrypt(mnemonicCiphertext)))
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};
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}
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return account;
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}
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function getDecryptKdfParams(data) {
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const kdf = spelunk(data, "crypto.kdf:string");
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if (kdf && typeof (kdf) === "string") {
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if (kdf.toLowerCase() === "scrypt") {
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const salt = spelunk(data, "crypto.kdfparams.salt:data!");
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const N = spelunk(data, "crypto.kdfparams.n:int!");
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const r = spelunk(data, "crypto.kdfparams.r:int!");
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const p = spelunk(data, "crypto.kdfparams.p:int!");
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// Make sure N is a power of 2
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assertArgument(N > 0 && (N & (N - 1)) === 0, "invalid kdf.N", "kdf.N", N);
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assertArgument(r > 0 && p > 0, "invalid kdf", "kdf", kdf);
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const dkLen = spelunk(data, "crypto.kdfparams.dklen:int!");
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assertArgument(dkLen === 32, "invalid kdf.dklen", "kdf.dflen", dkLen);
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return { name: "scrypt", salt, N, r, p, dkLen: 64 };
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}
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else if (kdf.toLowerCase() === "pbkdf2") {
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const salt = spelunk(data, "crypto.kdfparams.salt:data!");
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const prf = spelunk(data, "crypto.kdfparams.prf:string!");
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const algorithm = prf.split("-").pop();
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assertArgument(algorithm === "sha256" || algorithm === "sha512", "invalid kdf.pdf", "kdf.pdf", prf);
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const count = spelunk(data, "crypto.kdfparams.c:int!");
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const dkLen = spelunk(data, "crypto.kdfparams.dklen:int!");
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assertArgument(dkLen === 32, "invalid kdf.dklen", "kdf.dklen", dkLen);
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return { name: "pbkdf2", salt, count, dkLen, algorithm };
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}
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}
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assertArgument(false, "unsupported key-derivation function", "kdf", kdf);
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}
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/**
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* Returns the account details for the JSON Keystore Wallet %%json%%
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* using %%password%%.
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*
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* It is preferred to use the [async version](decryptKeystoreJson)
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* instead, which allows a [[ProgressCallback]] to keep the user informed
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* as to the decryption status.
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*
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* This method will block the event loop (freezing all UI) until decryption
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* is complete, which can take quite some time, depending on the wallet
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* paramters and platform.
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*/
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export function decryptKeystoreJsonSync(json, _password) {
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const data = JSON.parse(json);
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const password = getPassword(_password);
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const params = getDecryptKdfParams(data);
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if (params.name === "pbkdf2") {
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const { salt, count, dkLen, algorithm } = params;
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const key = pbkdf2(password, salt, count, dkLen, algorithm);
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return getAccount(data, key);
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}
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assert(params.name === "scrypt", "cannot be reached", "UNKNOWN_ERROR", { params });
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const { salt, N, r, p, dkLen } = params;
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const key = scryptSync(password, salt, N, r, p, dkLen);
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return getAccount(data, key);
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}
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function stall(duration) {
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return new Promise((resolve) => { setTimeout(() => { resolve(); }, duration); });
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}
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/**
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* Resolves to the decrypted JSON Keystore Wallet %%json%% using the
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* %%password%%.
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*
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* If provided, %%progress%% will be called periodically during the
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* decrpytion to provide feedback, and if the function returns
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* ``false`` will halt decryption.
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*
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* The %%progressCallback%% will **always** receive ``0`` before
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* decryption begins and ``1`` when complete.
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*/
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export async function decryptKeystoreJson(json, _password, progress) {
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const data = JSON.parse(json);
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const password = getPassword(_password);
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const params = getDecryptKdfParams(data);
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if (params.name === "pbkdf2") {
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if (progress) {
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progress(0);
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await stall(0);
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}
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const { salt, count, dkLen, algorithm } = params;
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const key = pbkdf2(password, salt, count, dkLen, algorithm);
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if (progress) {
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progress(1);
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await stall(0);
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}
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return getAccount(data, key);
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}
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assert(params.name === "scrypt", "cannot be reached", "UNKNOWN_ERROR", { params });
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const { salt, N, r, p, dkLen } = params;
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const key = await scrypt(password, salt, N, r, p, dkLen, progress);
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return getAccount(data, key);
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}
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function getEncryptKdfParams(options) {
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// Check/generate the salt
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const salt = (options.salt != null) ? getBytes(options.salt, "options.salt") : randomBytes(32);
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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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assertArgument(typeof (N) === "number" && N > 0 && Number.isSafeInteger(N) && (BigInt(N) & BigInt(N - 1)) === BigInt(0), "invalid scrypt N parameter", "options.N", N);
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assertArgument(typeof (r) === "number" && r > 0 && Number.isSafeInteger(r), "invalid scrypt r parameter", "options.r", r);
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assertArgument(typeof (p) === "number" && p > 0 && Number.isSafeInteger(p), "invalid scrypt p parameter", "options.p", p);
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return { name: "scrypt", dkLen: 32, salt, N, r, p };
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}
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function _encryptKeystore(key, kdf, account, options) {
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const privateKey = getBytes(account.privateKey, "privateKey");
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// Override initialization vector
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const iv = (options.iv != null) ? getBytes(options.iv, "options.iv") : randomBytes(16);
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assertArgument(iv.length === 16, "invalid options.iv length", "options.iv", options.iv);
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// Override the uuid
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const uuidRandom = (options.uuid != null) ? getBytes(options.uuid, "options.uuid") : randomBytes(16);
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assertArgument(uuidRandom.length === 16, "invalid options.uuid length", "options.uuid", options.iv);
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// This will be used to encrypt the wallet (as per Web3 secret storage)
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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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const derivedKey = key.slice(0, 16);
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const macPrefix = key.slice(16, 32);
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// Encrypt the private key
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const aesCtr = new CTR(derivedKey, iv);
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const ciphertext = getBytes(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: uuidV4(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(kdf.salt).substring(2),
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n: kdf.N,
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dklen: 32,
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p: kdf.p,
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r: kdf.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 (account.mnemonic) {
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const client = (options.client != null) ? options.client : `ethers/${version}`;
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const path = account.mnemonic.path || defaultPath;
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const locale = account.mnemonic.locale || "en";
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const mnemonicKey = key.slice(32, 64);
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const entropy = getBytes(account.mnemonic.entropy, "account.mnemonic.entropy");
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const mnemonicIv = randomBytes(16);
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const mnemonicAesCtr = new CTR(mnemonicKey, mnemonicIv);
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const mnemonicCiphertext = getBytes(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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const gethFilename = ("UTC--" + timestamp + "--" + data.address);
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data["x-ethers"] = {
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client, gethFilename, path, locale,
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mnemonicCounter: hexlify(mnemonicIv).substring(2),
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mnemonicCiphertext: hexlify(mnemonicCiphertext).substring(2),
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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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* Return the JSON Keystore Wallet for %%account%% encrypted with
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* %%password%%.
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*
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* The %%options%% can be used to tune the password-based key
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* derivation function parameters, explicitly set the random values
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* used. Any provided [[ProgressCallback]] is ignord.
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*/
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export function encryptKeystoreJsonSync(account, password, options) {
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if (options == null) {
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options = {};
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}
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const passwordBytes = getPassword(password);
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const kdf = getEncryptKdfParams(options);
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const key = scryptSync(passwordBytes, kdf.salt, kdf.N, kdf.r, kdf.p, 64);
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return _encryptKeystore(getBytes(key), kdf, account, options);
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}
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/**
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* Resolved to the JSON Keystore Wallet for %%account%% encrypted
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* with %%password%%.
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*
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* The %%options%% can be used to tune the password-based key
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* derivation function parameters, explicitly set the random values
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* used and provide a [[ProgressCallback]] to receive periodic updates
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* on the completion status..
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*/
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export async function encryptKeystoreJson(account, password, options) {
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if (options == null) {
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options = {};
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}
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const passwordBytes = getPassword(password);
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const kdf = getEncryptKdfParams(options);
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const key = await scrypt(passwordBytes, kdf.salt, kdf.N, kdf.r, kdf.p, 64, options.progressCallback);
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return _encryptKeystore(getBytes(key), kdf, account, options);
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}
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//# sourceMappingURL=json-keystore.js.map
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