Merge pull request #34 from evolution-gaming/sandbox/jurisk/generate-…

…private-key

Encrypt app should have a "feature" to generate a random privateKey

src/main/scala/com/evolutiongaming/crypto/Encrypt.scala

@@ -1,11 +1,19 @@
 package com.evolutiongaming.crypto
 
+import scala.util.Random
+
 object Encrypt extends App {
-  if (args.length != 2) {
-    println("Expected 2 arguments - value and privateKey")
+  if (args.length < 1 || args.length > 2) {
+    println("Expected 1 or 2 arguments - value and optional privateKey")
   } else {
     val value = args(0)
-    val privateKey = args(1)
+    val privateKey = args.lift(1) getOrElse {
+      val generated = Random.alphanumeric.take(16).mkString
+      println(s"privateKey wasn't provided and therefore a new privateKey was automatically generated: $generated")
+      generated
+    }
+
+    require(privateKey.length == 16, s"Expected privateKey to have 16 characters, got ${privateKey.length} characters instead")
 
     val encrypted = Crypto.encryptAES(value, privateKey)
     println(encrypted)