const asmcrypto = require('asmcrypto.js') const Unibabel = require('browserify-unibabel') class EdgeEncryptor { encrypt (password, dataObject) { var salt = this._generateSalt() return this._keyFromPassword(password, salt) .then(function (key) { var data = JSON.stringify(dataObject) var dataBuffer = Unibabel.utf8ToBuffer(data) var vector = global.crypto.getRandomValues(new Uint8Array(16)) var resultbuffer = asmcrypto.AES_GCM.encrypt(dataBuffer, key, vector) var buffer = new Uint8Array(resultbuffer) var vectorStr = Unibabel.bufferToBase64(vector) var vaultStr = Unibabel.bufferToBase64(buffer) return JSON.stringify({ data: vaultStr, iv: vectorStr, salt: salt, }) }) } decrypt (password, text) { const payload = JSON.parse(text) const salt = payload.salt return this._keyFromPassword(password, salt) .then(function (key) { const encryptedData = Unibabel.base64ToBuffer(payload.data) const vector = Unibabel.base64ToBuffer(payload.iv) return new Promise((resolve, reject) => { var result try { result = asmcrypto.AES_GCM.decrypt(encryptedData, key, vector) } catch (err) { return reject(new Error('Incorrect password')) } const decryptedData = new Uint8Array(result) const decryptedStr = Unibabel.bufferToUtf8(decryptedData) const decryptedObj = JSON.parse(decryptedStr) resolve(decryptedObj) }) }) } _keyFromPassword (password, salt) { var passBuffer = Unibabel.utf8ToBuffer(password) var saltBuffer = Unibabel.base64ToBuffer(salt) return new Promise((resolve) => { var key = asmcrypto.PBKDF2_HMAC_SHA256.bytes(passBuffer, saltBuffer, 10000) resolve(key) }) } _generateSalt (byteCount = 32) { var view = new Uint8Array(byteCount) global.crypto.getRandomValues(view) var b64encoded = btoa(String.fromCharCode.apply(null, view)) return b64encoded } } module.exports = EdgeEncryptor