88 lines
2.7 KiB
JavaScript
88 lines
2.7 KiB
JavaScript
"use strict";
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const fs = require("fs");
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const os = require("os");
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const resolve = require("path").resolve;
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const AES = require("aes-js");
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const scrypt = require("scrypt-js");
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const { prompt } = require("../packages/cli");
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const randomBytes = require("../packages/random").randomBytes;
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const computeHmac = require("../packages/sha2").computeHmac;
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const colorify = require("./log").colorify;
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function getConfigFilename() {
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return resolve(os.homedir(), ".ethers-dist");
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}
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function getScrypt(message, password, salt) {
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let progressBar = prompt.getProgressBar(message);
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return new Promise((resolve, reject) => {
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scrypt(Buffer.from(password), Buffer.from(salt), (1 << 17), 8, 1, 64, (error, progress, key) => {
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if (error) { return reject(error); }
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progressBar(progress);
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if (key) { resolve(key); }
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});
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});
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}
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async function loadConfig(dkey) {
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let config = { };
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let filename = getConfigFilename();
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if (fs.existsSync(filename)) {
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let data = JSON.parse(fs.readFileSync(filename));
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let ciphertext = Buffer.from(data.ciphertext, "base64");
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let iv = Buffer.from(data.iv, "base64");
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let aes = new AES.ModeOfOperation.ctr(dkey.slice(0, 32), new AES.Counter(iv));
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let plaintext = aes.decrypt(ciphertext);
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let hmac = computeHmac("sha512", dkey.slice(32, 64), plaintext);
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if (hmac !== data.hmac) {
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throw new Error("wrong password");
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}
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config = JSON.parse(Buffer.from(plaintext).toString());
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}
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return config;
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}
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async function getConfig(key) {
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let password = await prompt.getPassword(colorify("Password (seesion-store): ", "bold"));
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let dkey = await getScrypt(colorify("Decrypting", "bold"), password, key);
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let config = await loadConfig(dkey);
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return config[key];
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}
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async function setConfig(key, value) {
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let password = await prompt.getPassword(colorify("Password (seesion-store): ", "bold"));
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let dkey = await getScrypt("Encrypting", password, key);
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let config = await loadConfig(dkey);
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config[key] = value;
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config._junk = Buffer.from(randomBytes(16 + parseInt(Math.random() * 48))).toString("base64")
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let plaintext = Buffer.from(JSON.stringify(config));
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let iv = Buffer.from(randomBytes(16));
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let hmac = computeHmac("sha512", dkey.slice(32, 64), plaintext);
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let aes = new AES.ModeOfOperation.ctr(dkey.slice(0, 32), new AES.Counter(iv));
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let ciphertext = Buffer.from(aes.encrypt(plaintext));
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let data = {
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ciphertext: ciphertext.toString("base64"),
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iv: iv.toString("base64"),
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hmac: hmac
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};
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fs.writeFileSync(getConfigFilename(), JSON.stringify(data, null, 2));
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}
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module.exports = {
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get: getConfig,
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set: setConfig
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}
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