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crypto/elliptic: fix incomplete addition used in CombinedMult.
The optimised P-256 includes a CombinedMult function, which doesn't do dual-scalar multiplication, but does avoid an affine conversion for ECDSA verification. However, it currently uses an assembly point addition function that doesn't handle exceptional cases. Fixes #20215. Change-Id: I4ba2ca1a546d883364a9bb6bf0bdbc7f7b44c94a Reviewed-on: https://go-review.googlesource.com/42611 Run-TryBot: Adam Langley <[email protected]> Reviewed-by: Adam Langley <[email protected]>
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