32-bit implementation of AES encryption

I'm trying to implement AES. I currently have implemented subByte(), shiftRow(), mixColumn(), addRoundkey() and generation roundkey of 8-bit AES, and that is working. But its performance is not good. So I want to implement 32-bit AES in software, but generating the extended s-box is confusing me. How does data entering as 8-bit come out as 32-bit?开发者_如何学Python I can't find a 32-bit implementation of AES in software.

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I suggest implementing it in a bit sliced manner. Bit sliced implementations do not only scale very well, they have also very good properties regarding timing attacks. I know this requires a redesign of your functions. And a performance gain can only be archived if you calculate multiple AES operations in parallel.

The fastest AES implementation (without Intel AES instructions) is bit sliced: http://eprint.iacr.org/2009/129

With Google you will also find the source code.