arcfour.rb in prawn-2.5.0

- old
+ new

@@ -4,14 +4,10 @@
 # as described at:
 # http://www.mozilla.org/projects/security/pki/nss/draft-kaukonen-cipher-arcfour-03.txt
 #
 # "RC4" is a trademark of RSA Data Security, Inc.
 #
-# Copyright August 2009, Brad Ediger. All Rights Reserved.
-#
-# This is free software. Please see the LICENSE and COPYING files for details.
-
 # @private
 class Arcfour
   def initialize(key)
     # Convert string key to Array of integers
     key = key.unpack('c*') if key.is_a?(String)
@@ -36,9 +32,13 @@
     end
 
     @i = @j = 0
   end
 
+  # Encrypt string.
+  #
+  # @param string [String]
+  # @return [String]
   def encrypt(string)
     string.unpack('c*').map { |byte| byte ^ key_byte }.pack('c*')
   end
 
   private