add edge support

3 files changed, 78 insertions, 0 deletions

diff --git a/app/scripts/background.js b/app/scripts/background.js
index 6bf7707e8..7bececba1 100644
--- a/app/scripts/background.js
+++ b/app/scripts/background.js
@@ -15,6 +15,7 @@ const MetamaskController = require('./metamask-controller')
 const firstTimeState = require('./first-time-state')
 const setupRaven = require('./setupRaven')
 const setupMetamaskMeshMetrics = require('./lib/setupMetamaskMeshMetrics')
+const EdgeEncryptor = require('./edge-encryptor')
 
 const STORAGE_KEY = 'metamask-config'
 const METAMASK_DEBUG = 'GULP_METAMASK_DEBUG'
@@ -30,6 +31,12 @@ global.METAMASK_NOTIFIER = notificationManager
 const release = platform.getVersion()
 const raven = setupRaven({ release })
 
+// browser check if it is Edge - https://stackoverflow.com/questions/9847580/how-to-detect-safari-chrome-ie-firefox-and-opera-browser
+// Internet Explorer 6-11
+const isIE = !!document.documentMode
+// Edge 20+
+const isEdge = !isIE && !!window.StyleMedia
+
 let popupIsOpen = false
 
 // state persistence
@@ -78,6 +85,7 @@ function setupController (initState) {
     initState,
     // platform specific api
     platform,
+    encryptor: isEdge ? new EdgeEncryptor() : undefined,
   })
   global.metamaskController = controller
 
diff --git a/app/scripts/edge-encryptor.js b/app/scripts/edge-encryptor.js
new file mode 100644
index 000000000..9d6ac37b3
--- /dev/null
+++ b/app/scripts/edge-encryptor.js
@@ -0,0 +1,69 @@
+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
diff --git a/package.json b/package.json
index 74a9f15d0..c47c46004 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,7 @@
     ]
   },
   "dependencies": {
+    "asmcrypto.js": "0.22.0",
     "async": "^2.5.0",
     "await-semaphore": "^0.1.1",
     "babel-runtime": "^6.23.0",