Does RHEL5 support Intel AES hardware extension?

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Issue

The servers are running Intel(R) Xeon(R) CPU E7-2870. According to Intel web site, it does support new hardware AES instructions (AES-NI).
Does RHEL5 support these? If yes, how can one make sure that LUKS is using this feature? Does it do it by default?

Environment

Red Hat Enterprise Linux 5

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