ecc: ec_addm/ec_subm improvement

[Werner Koch]

On Thu, 10 Dec 2015 08:47, gniibe at fsij.org said:

> The change in this patch itself includes non-constant-time path,
> it should be improved.

In ec.c we do not use any MPI internals.  I would suggest to move the
bulk of the code out to a new mpi_add_someothername function.


Salam-Shalom,

   Werner

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