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- <h1 class="page-title">edge-encryptor.js</h1>
-
-
-
-
-
-
-
- <section>
- <article>
- <pre class="prettyprint source linenums"><code>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 JavaScript object to cypher text
- *
- * @param {string} password Password used to unlock a cryptographic key
- * @param {Object} dataObject Data to encrypt
- * @returns {Object} Object containing cypher text, generation vectors, and salt
- */
- 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 JavaScript object from cypher text
- *
- * @param {string} password Password used to unlock a cryptographic key
- * @param {string} text Cypher text of an encrypted JavaScript object
- * @returns {Promise&lt;Object>} Promise resolving to copy of decrypted JavaScript 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 base-64 data
- * @returns {Promise&lt;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 base-64 encoded data
- *
- * @private
- * @returns {string} Randomized base-64 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
-</code></pre>
- </article>
- </section>
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