elliptic-curve: add ReduceNonZero trait
#827
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Adds a trait similar to `Reduce`, but where the output of the reduction is ensured to be non-zero. Also impls `Reduce` and `ReduceNonZero` for `NonZeroScalar`. This means that end users need only concern themselves with `Reduce` as they can use `NonZeroScalar::<C>::from_uint_reduced` instead of the more cumbersome `Scalar::<C>::from_uint_reduced_non_zero`. Related: RustCrypto/elliptic-curves#432
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In #827, a `ReduceNonZero` trait was added whose method name uses an underscored `*_non_zero`. However, there's already one bit of precedent in the public API: - `SecretKey::to_nonzero_scalar` Since this is already a stable API and providing precedent, for consistency this commit changes all of the unstable/unreleased APIs and internal module naming to use `nonzero` instead of `non_zero`, as this is a non-breaking change.
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In #827, a `ReduceNonZero` trait was added whose method name uses an underscored `*_non_zero`. However, there's already one bit of precedent in the public API: - `SecretKey::to_nonzero_scalar` Since this is already a stable API and providing precedent, for consistency this commit changes all of the unstable/unreleased APIs and internal module naming to use `nonzero` instead of `non_zero`, as this is a non-breaking change.
This was referenced Dec 3, 2021
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Adds a trait similar to
Reduce, but where the output of the reduction is ensured to be non-zero.Also impls
ReduceandReduceNonZeroforNonZeroScalar. This means that end users need only concern themselves withReduceas they can useNonZeroScalar::<C>::from_uint_reducedinstead of the more cumbersomeScalar::<C>::from_uint_reduced_non_zero.Related: RustCrypto/elliptic-curves#432
cc @fjarri