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Changelog

All notable changes to this library will be documented in this file.

The format is based on Keep a Changelog, and this library adheres to Rust's notion of Semantic Versioning.

[Unreleased]

[0.11.0] - 2021-09-02

Added

  • subtle::ConstantTimeEq bound on ff::Field
  • Copy + Send + Sync + 'static bounds on ff::PrimeField::Repr
  • ff::derive module behind the derive feature flag, containing dependencies for the PrimeField derive macro:
    • Re-exports of required crates.
    • adc, mac, sbb constant-time const helper functions.
  • ff::Field::is_zero_vartime
  • ff::PrimeField::from_repr_vartime

Changed

  • ff::Field::is_zero now returns subtle::Choice.
  • ff::PrimeField::{is_odd, is_even} now return subtle::Choice.
  • ff::PrimeField::from_repr now return subtle::CtOption<Self>.
  • ff::PrimeField::from_str has been renamed to PrimeField::from_str_vartime.

Removed

  • ff::{adc, mac_with_carry, sbb} (replaced by ff::derive::{adc, mac, sbb}).

[0.10.1] - 2021-08-11

Added

  • ff::BatchInvert extension trait, implemented for iterators over mutable field elements which allows those field elements to be inverted in a batch. This trait is behind the new alloc feature flag.
  • ff::BatchInverter struct, which provides methods for non-allocating batch inversion of field elements contained within slices.

[0.10.0] - 2021-06-01

Added

  • ff::PrimeFieldBits: PrimeField trait, behind a bits feature flag.

Changed

  • MSRV is now 1.51.0.
  • Bumped bitvec to 0.22 to enable fixing a performance regression in ff 0.9. The bitvec::view::BitView re-export has been replaced by bitvec::view::BitViewSized.
  • The bitvec dependency and its re-exports have been gated behind the bits feature flag.

Removed

  • ff::PrimeField::{ReprBits, char_le_bits, to_le_bits} (replaced by ff::PrimeFieldBits trait).

Fixed

  • #[derive(PrimeField)] now works on small moduli (that fit in a single u64 limb).

[0.9.0] - 2021-01-05

Added

  • Re-export of bitvec::view::BitView.
  • ff::FieldBits<V> type alias for the return type of ff::PrimeField::{char_le_bits, to_le_bits}.

Changed

  • Bumped bitvec to 0.20, rand_core to 0.6.

Removed

  • From<Self> and From<&Self> bounds on ff::PrimeField::Repr.

[0.8.0] - 2020-09-08

Added

  • ff::PrimeField::{ReprBits, char_le_bits, to_le_bits}, and a public dependency on bitvec 0.18.
  • ff::Field::cube method with provided implementation.
  • Send + Sync bounds on ff::PrimeField::ReprBits

Changed

  • MSRV is now 1.44.0.
  • ff::Field::random<R: RngCore + ?Sized>(rng: &mut R) -> Self has been changed to Field::random(rng: impl RngCore) -> Self, to aligh with group::Group::random.

Removed

  • fmt::Display bound on ff::Field.
  • ff::PrimeField::char (replaced by ff::PrimeField::char_le_bits).
  • ff::{BitIterator, Endianness, PrimeField::ReprEndianness (replaced by ff::PrimeField::to_le_bits).