AES256 crypto (missing?) in erlang

I would like to use 256-bit key AES in erlang.

I've had a look at the crypto driver code(*) and ...
 * 192 and 256-bit keys are not provided for (although openssl supports this)
 * For the 128-bit case, AES_set_encrypt_key() is called for every block encrypted (inefficient)

If you have used 256-bit AES under erlang, what did you do? What are my options?

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[*] I examined R11B5 source but the online crypto application doc for R12B indicates the same behaviour.

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