Actually only Version 0 is not supported at the moment (default encryption version in Chef 10.x http://docs.opscode.com/chef/essentials_data_bags.html). 

I think by using OpenSSL via ctypes version 0 can be implemented as well in the future (pkcs5_keyivgen needs to be implemented http://apidock.com/ruby/v1_9_2_180/OpenSSL/Cipher/pkcs5_keyivgen).