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cfbf0da93c
ECDSA requires the ability to add two arbitrary curve points, either of which may legitimately be the point at infinity. Update the API so that curves must choose an explicit affine representation for the point at infinity, and provide a method to test for this representation. Multiplication and addition will now allow this representation to be provided as an input, and will not fail if the result is the point at infinity. Callers must explicitly check for the point at infinity where needed (e.g. after computing the ECDHE shared secret curve point). Signed-off-by: Michael Brown <mcb30@ipxe.org>
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