[WIP] Add legacy
feature with ECDSA-related traits
#67
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This is an alternative to #65 which scopes the "legacy" functionality specifically to what is needed to implement ECDSA.
ECDSA signing computes the
r
component of a signature by reducing the affine x-coordinate of an ephemeral point mod n.This adds a
ReduceAffineX
trait for performing this reduction, with the goal of facilitating an ECDSA implementation which is generic over (prime order) elliptic curves.Additionally, it adds an
IsAffineYOdd
trait which is useful for computing the "recovery ID" used to recover the public key which created a signature (ala point compression).