How to choose encryption algorithm for LUKS in kickstart with Red Hat Enterprise Linux 6

Issue

• Customer would like to encrypt their filesystems using LUKS with "aes-cbc-essiv:sha256" in the kickstart.
• The algorighm used by anaconda is always "aes-xts-plain64".
• it can be a option to use %pre install section of kickstart to run the commands. But, they want to see the simple kickstart option to change the algorithm.