[ub] signed left shifts again

John Regehr regehr at cs.utah.edu
Wed Nov 13 18:09:19 CET 2013


Ok, I've spent some time looking at open source crypto libraries and 
wrote up some results here:

   http://blog.regehr.org/archives/1054

A good number of these problems will go away once shifting into the sign 
bit is no longer UB, and most of the rest go away once the maintainers 
of 5 packages fix their rotate functions.

John


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