rubocop update and resolutions

app/services/crypt_serializer.rb

@@ -26,18 +26,28 @@ class CryptSerializer
       raise "Attribute was supposed to be a `String`, but was instead a `#{value.class}`"
     end
 
-    cipher.encrypt
-    parts = [cipher.random_key, cipher.random_iv, cipher.update(value) + cipher.final]
-    Base64.urlsafe_encode64 Marshal.dump(parts)
+    build_cipher value
   end
 
   def decrypt(value)
     return value if value.nil?
 
     parts = Marshal.load Base64.urlsafe_decode64(value)
-    cipher.decrypt
-    cipher.key = parts[0]
-    cipher.iv = parts[1]
-    cipher.update(parts[2]) + cipher.final
+    decode_cipher parts
   end
+
+  private
+
+    def build_cipher value
+      cipher.encrypt
+      parts = [cipher.random_key, cipher.random_iv, cipher.update(value) + cipher.final]
+      Base64.urlsafe_encode64 Marshal.dump(parts)
+    end
+
+    def decode_cipher parts
+      cipher.decrypt
+      cipher.key = parts[0]
+      cipher.iv = parts[1]
+      cipher.update(parts[2]) + cipher.final
+    end
 end