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//! This module provides common utilities, traits and structures for group and
//! field arithmetic.
//!
//! This module is temporary, and the extension traits defined here are expected to be
//! upstreamed into the `ff` and `group` crates after some refactoring.
pub use ff::Field;
mod curves;
mod fields;
pub use curves::*;
pub use fields::*;
/// This represents an element of a group with basic operations that can be
/// performed. This allows an FFT implementation (for example) to operate
/// generically over either a field or elliptic curve group.
pub trait Group: Copy + Clone + Send + Sync + 'static {
/// The group is assumed to be of prime order $p$. `Scalar` is the
/// associated scalar field of size $p$.
type Scalar: FieldExt;
/// Returns the additive identity of the group.
fn group_zero() -> Self;
/// Adds `rhs` to this group element.
fn group_add(&mut self, rhs: &Self);
/// Subtracts `rhs` from this group element.
fn group_sub(&mut self, rhs: &Self);
/// Scales this group element by a scalar.
fn group_scale(&mut self, by: &Self::Scalar);
}