tree ef516501f22f00f5345135f1dcc65e3be8f616e6
parent 30838868ac135e1bc6f26e08655dd9b54841bf8d
author Hanno Becker <hanno.becker@arm.com> 1641359988 +0000
committer Hanno Becker <hanno.becker@arm.com> 1641444405 +0000

Make ecp_select_comb() create valid EC point with Z coordinate set

ecp_select_comb() did previously not set the Z coordinate of the target point.
Instead, callers would either set it explicitly or leave it uninitialized,
relying on the (only partly upheld) convention that sometimes an uninitialized
Z value represents 1.

This commit modifies ecp_select_comb() to always set the Z coordinate to 1.
This comes at the cost of memory for a single coordinate, which seems worth
it for the increased robustness.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>