On 7/10/07, C. Scott Ananian <[EMAIL PROTECTED]> wrote: > The AES encryption on the Geode is spec'ed at 40MiB/sec. Using a > fixed key converts AES into a hash function which is over 50x faster > than what we've got.
I take this back, partially: the Geode AES is geared towards bulk encryption with a fixed key. Although my copy of Applied Crypto is at home, hash-using-block cipher algorithms rekey often (see http://en.wikipedia.org/wiki/Hash_functions_based_on_block_ciphers and its footnote 1). I couldn't immediately find cycle breakdowns for rekeying on the Geode, but it's reasonable to assume that we can't quite hash at 40MiB/s. However, the 50x factor gives us plenty of room to play with, and the Geode AES interface lets us pipeline the two halves of an MDC-2 implementation ( http://eprint.iacr.org/2006/294.pdf ). It may be of academic interest to implement and benchmark AES-128/MDC-2 now that I've got an XO, but from what I'm hearing our hash algorithms are already pretty much set in stone. --scott -- ( http://cscott.net/ ) _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
