Add Response class as base

lib/crypto.rb

@@ -1,3 +1,4 @@
 module Crypto
   autoload :PBE, 'crypto/pbe'
+  autoload :Response, 'crypto/response'
 end

lib/crypto/pbe.rb

@@ -39,19 +39,12 @@ def derived_key(password, salt, sizeKey = 24)
     end
   end
 
-  class PKCS5
+  class PKCS5 < Crypto::Response
     attr_reader :key
 
-    def ==(other)
-      key == other.key
-    end
-
     def initialize(args)
       @key = OpenSSL::PKCS5.pbkdf2_hmac(*args.values)
-    end
-
-    def to_hex
-      key.unpack('H*').first
+      @data = key # key attribute is syntax sugar
     end
   end
 end

lib/crypto/response.rb

@@ -0,0 +1,17 @@
+module Crypto
+  class Response
+    attr_reader :data
+
+    def ==(other)
+      data == other.data
+    end
+
+    def initialize(data)
+      @data = data
+    end
+
+    def to_hex
+      data.unpack('H*').first
+    end
+  end
+end