Bug 660394: when generating an ECDSA signature, use a scalar that is equivalent to k but has a fixed bit length to avoid leaking the length of k in timing information.  The patch is contributed by Douglas Stebila <douglas@stebila.ca>.  r=wtc.
Bug 660394: when generating an ECDSA signature, use a scalar that is
equivalent to k but has a fixed bit length to avoid leaking the length of
k in timing information.  The patch is contributed by Douglas Stebila
<douglas@stebila.ca>.  r=wtc.

thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss