1 files changed, 51 insertions, 0 deletions
diff --git a/app/scripts/lib/encryptor.js b/app/scripts/lib/encryptor.js
new file mode 100644
index 000000000..607825764
--- /dev/null
+++ b/app/scripts/lib/encryptor.js
@@ -0,0 +1,51 @@
+var vector = global.crypto.getRandomValues(new Uint8Array(16))
+var key = null
+
+module.exports = {
+  encrypt,
+  decrypt,
+  convertArrayBufferViewtoString,
+  keyFromPassword,
+}
+
+// Takes a Pojo, returns encrypted text.
+function encrypt (password, dataObj) {
+  var data = JSON.stringify(dataObj)
+  global.crypto.subtle.encrypt({name: 'AES-CBC', iv: vector}, key, convertStringToArrayBufferView(data)).then(function(result){
+    const encryptedData = new Uint8Array(result)
+    return encryptedData
+  },
+  function(e){
+    console.log(e.message)
+  })
+}
+
+// Takes encrypted text, returns the restored Pojo.
+function decrypt (password, text) {
+
+}
+
+function convertStringToArrayBufferView (str) {
+  var bytes = new Uint8Array(str.length)
+  for (var i = 0; i < str.length; i++) {
+    bytes[i] = str.charCodeAt(i)
+  }
+
+  return bytes
+}
+
+function convertArrayBufferViewtoString (buffer) {
+  var str = ''
+  for (var i = 0; i < buffer.byteLength; i++) {
+    str += String.fromCharCode(buffer[i])
+  }
+
+  return str
+}
+
+function keyFromPassword (password) {
+  global.crypto.subtle.digest({name: 'SHA-256'}, convertStringToArrayBufferView(password)).then(function(result){
+    return global.crypto.subtle.importKey('raw', result, {name: 'AES-CBC'}, false, ['encrypt', 'decrypt'])
+  })
+}
+