On Mon, Dec 28, 2009 at 06:59:15PM +0000, Max Vozeler wrote: > This is a compatible implementation of the block chaining > modes used by the Loop-AES block device encryption system > (http://loop-aes.sf.net/). > > It implements two modes: lmk2 and lmk3. They correspond to > the modes used in Loop-AES v2.x and Loop-AES v3.x and are > intended to be full compatible. > > Both modes operate on full 512 byte sectors. They use CBC > with an IV derived from the sector number, the data and (for > lmk3 only) an extra 128-bit IV seed. > > Signed-off-by: Max Vozeler <max@xxxxxxxxxxxxx> > Cc: Jari Ruusu <jariruusu@xxxxxxxxxxxxxxxxxxxxx> So this is just CBC with a modified IV? If so it should not be implemented as another mode. Doing it as a mode means that you will not benefit from any hardware implementations of CBC. You should instead implement it as an IV generator. Currently they're done in dm-crypt. But we could move them into crypto at some point if there are multiple users in the kernel. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/
