On Mon, Oct 28 2013 at 6:21pm -0400, Milan Broz <gmazyland@xxxxxxxxx> wrote: > Some encryption modes use extra keys (e.g. loopAES has IV seed) > which are not used in block cipher initialization but are part > of key string in table constructor. > > Patch adds additional field which described lenght of this extra > keys and substracts it before real key encryption setting. > > So the key_size always includes the size of provided key > in mapping table in bytes. > > The key_parts descibes how many parts (usually keys) contains > the whole key buffer and key_extra_size contains size in bytes > of additional keys part (this number of bytes must be cut off > because is processed by IV generator). > > | K1 | K2 | .... | K64 | Kiv | > |----------- key_size ----------------- | > | |-key_extra_size-| > | [64 keys] [1 key] | => key_parts = 65 > > Example where key string contains main key K, whitening key > Kw and IV seed Kiv: > > | K | Kiv | Kw | > |--------------- key_size ---------------| > | |-----key_extra_size-------| > | [1 key] | [1 key] | [1 key] | => key_parts = 3 > > Because extra keys are calculated during IV mode setting, > key initialization is moved after this step. > > For now, this change has no effect to supported modes > (thanks to ilog2 rounding) but is required by following patch. > > Signed-off-by: Milan Broz <gmazyland@xxxxxxxxx> I pushed this to linux-next (for v3.13), see: https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=for-next&id=60039e2b0474f4e6b66746b9e179ca384d3e5c96 I tweaked the header a little and some whitespace. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
