elliptic-curve: add scalar::IsHigh trait
#814
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Adds a trait for determining if a given scalar is larger than the order divided by 2. This is useful for "normalization" use cases such as low-S normalized ECDSA signatures, where a scalar is conditionally negated if "high".
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Adds a trait for determining if a given scalar is larger than the order divided by 2.
This is useful for "normalization" use cases such as low-S normalized ECDSA signatures, where a scalar is conditionally negated if "high".