const asmcrypto = require('asmcrypto.js') const Unibabel = require('browserify-unibabel') /** * A Microsoft Edge-specific encryption class that exposes * the interface expected by eth-keykeyring-controller */ class EdgeEncryptor { /** * Encrypts an arbitrary object to ciphertext * * @param {string} password Used to generate a key to encrypt the data * @param {Object} dataObject Data to encrypt * @returns {Promise<string>} Promise resolving to an object with ciphertext */ 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, }) }) } /** * Decrypts an arbitrary object from ciphertext * * @param {string} password Used to generate a key to decrypt the data * @param {string} text Ciphertext of an encrypted object * @returns {Promise<Object>} Promise resolving to copy of decrypted object */ 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) }) }) } /** * Retrieves a cryptographic key using a password * * @private * @param {string} password Password used to unlock a cryptographic key * @param {string} salt Random base64 data * @returns {Promise<Object>} Promise resolving to a derived key */ _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) }) } /** * Generates random base64 encoded data * * @private * @returns {string} Randomized base64 encoded data */ _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 ='/~lantw44/cgit/meow/blame/doc/html/functions_func_z.html?id=2b1782939ff561dc15f7a80e0e10055f2a8b1c82'>blame</a>) <table summary='blob content' class='blob'> <tr><td class='linenumbers'><pre><a id='n1' href='#n1'>1</a> <a id='n2' 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