k256: impl ReduceNonZero<U512> for Scalar
#474
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Provides an impl of the
ReduceNonZerotrait added in RustCrypto/elliptic-curves#827, which provides a reduction from a 512-bit (64-byte) input, i.e. a "wide" reduction from an integer twice the size of the curve's order, to aScalarwhich is guaranteed to be non-zero.Based on @fjarri's work in #432