On Mon, Aug 05, 2013 at 01:33:24PM +0100, Ian Jackson wrote: > AIUI SHA-512 is faster than SHA-256 on many processors, and not > usually slower on the others. If the hashes are too long, they can be > truncated.
Not that, I think it matters, but this got me interested. It appears that in practice this depends entirely on the word size. So SHA-256 is faster on 32bit architectures and SHA-512 is faster on 64bit architectures. The other aspect is that a block update of SHA-256 uses 64 rounds for a 64 byte block. Whereas SHA-512 uses 80 rounds for a 128 byte block update. So SHA-512 lowers the rounds/byte ratio. Now what can we do with this knowledge? Probably negligible. Helmut -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20130805162104.ga32...@alf.mars
