encrypting partitions

[Louis E Garcia II]

I encrypted my /home partition with luksformat back when I installed
fc6, using the aes cipher and sha256 hash. I currently am running f7
with the same /home partition. I recently read where sha-1 was broken.
Do I need to worry about my data? Is this the strongest encryption
available with f7? I noticed an sha512 module, is there a stronger hash
I can use? I don't mind reformatting.

-Thanks