[PATCH 02/04] Add generic scatterwalker

[Fruhwirth Clemens]

Add a generic scatterwalk code taking an arbitrary number of
scatterlists to walk through, a generalization of crypt(..), see
comments in scatterwalk.c.

The scratch buffer is allocated lazy. Therefore, I refactored the
scatterwalk_whichbuf a bit, making it a macro and splitting off a
scatterwalk_needscratch.

The rest is straight forward.

 scatterwalk.c |  107 ++++++++++++++++++++++++++++++++++++++++++++++++++++------
 scatterwalk.h |   13 ++++++-
 2 files changed, 109 insertions(+), 11 deletions(-)

-- 
Fruhwirth Clemens <clemens at endorphin.org>  http://clemens.endorphin.org
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