group

Added

• group::CurveAffine, an affine-representation trait that the curve-specific affine traits are now built on top of.
• group::Group::mul_by_generator, with a default implementation. Implementors can override it to take advantage of precomputed tables.
• group::Group::try_random<R: TryRng + ?Sized>(rng: &mut R) -> Result<Self, R::Error>, a new trait method that must be implemented by downstreams. It samples a non-identity group element using a fallible RNG and propagates the RNG's error.

Changed

• MSRV is now 1.85.0.
• Bumped dependencies to ff 0.14, rand_core 0.10.
• group::Group::random(rng: impl RngCore) -> Self has been changed to Group::random<R: Rng + ?Sized>(rng: &mut R) -> Self, to enable passing a trait object as the RNG. It now has a default implementation in terms of Group::try_random.
• The curve-related traits have been refactored around the new CurveAffine trait:
  • group::Curve::AffineRepr has been renamed to Curve::Affine.
  • All of the trait methods and associated types on the following traits have been removed (use group::Curve::Affine or the group::CurveAffine trait instead; trait implementors must implement group::CurveAffine instead using the same logic):
    • group::cofactor::CofactorCurve
    • group::cofactor::CofactorCurveAffine
    • group::prime::PrimeCurve
    • group::prime::PrimeCurveAffine
  • group::cofactor::CofactorCurveAffine and group::prime::PrimeCurveAffine now have blanket implementations for all types C: group::CurveAffine where C::Curve implements CofactorCurve or PrimeCurve respectively.

Changed

• Bumped ff to 0.13

Added

• group::{WnafBase, WnafScalar} structs for caching precomputations of both bases and scalars, for improved many-base many-scalar multiplication performance.
• impl memuse::DynamicUsage for group::{Wnaf WnafBase, WnafScalar}, behind the new wnaf-memuse feature flag, to enable the heap usage of these types to be measured at runtime.

Changed

• Removed temporary allocations from Wnaf internals for improved performance.

Changed

• MSRV is now 1.56.0.
• Bumped ff to 0.12

Fixed

• The affine scalar multiplication bounds on the following traits had typos that prevented multiplying by &Self::Scalar, which has now been fixed:
  • group::cofactor::{CofactorCurve::Affine, CofactorCurveAffine}
  • group::prime::{PrimeCurve::Affine, PrimeCurveAffine}

Added

• Copy + Send + Sync + 'static bounds on group::GroupEncoding::Repr.

Changed

• Bumped ff to 0.11.

Added

• group::ff, which re-exports the ff crate to make version-matching easier.

Changed

• MSRV is now 1.51.0.
• Bumped ff to 0.10.

Removed

• group::cofactor::CofactorGroup::is_torsion_free provided implementation (trait implementors must now implement this method themselves). This avoids a hard dependency on the ff/bits feature flag.

Changed

• Bumped dependencies to ff 0.9, rand_core 0.6, rand 0.8.

Added

• no_std support.

Changed

• MSRV is now 1.44.0.
• Bumped ff to 0.8.
• group::{wnaf, Wnaf, WnafGroup} are now gated behind the (default-enabled) alloc feature flag. The byteorder dependency is now optional.
• group::tests is now gated behind the tests feature flag. The rand and rand_xorshift dependencies are now optional.

Removed

• fmt::Display bound from the following traits:
  • group::Group
  • group::cofactor::CofactorCurveAffine
  • group::prime::PrimeCurveAffine