Re: CVS commit: src

[Taylor R Campbell <campbell+netbsd-source-changes-d%mumble.net@localhost>]

   Date: Thu, 30 Aug 2012 18:01:06 +0000
   From: David Holland <dholland-sourcechanges%netbsd.org@localhost>

   On Thu, Aug 30, 2012 at 11:44:41AM -0400, Christos Zoulas wrote:
    > int
    > consttime_memcmp(const void *s1, const void *s2, size_t n)
    > [snip]

   so, I evidently missed this: what's "consttime" about this?

It means that the time it takes does not vary depending on the data at
s1 and s2.  Here `constant' does not mean `bounded by a constant' but
rather `not variable', i.e. `does not leak information about s1 and s2
through a timing side channel'.