mirror of
https://github.com/saymrwulf/pasta_curves-source.git
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ab03c3d5e1
Now that we have a default implementation of `SqrtRatio::sqrt_ratio`, we can use it and `FieldExt` in no-std environments. We introduce an `alloc` feature flag to form a common feature dependency between `std` and `sqrt-table`. It is currently unused directly, but will be used after `CurveAffine` is refactored to remove the `std` dependency. Closes zcash/pasta_curves#25.
34 lines
1.1 KiB
Rust
34 lines
1.1 KiB
Rust
//! This module provides common utilities, traits and structures for group and
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//! field arithmetic.
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//!
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//! This module is temporary, and the extension traits defined here are expected to be
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//! upstreamed into the `ff` and `group` crates after some refactoring.
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mod curves;
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mod fields;
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pub(crate) use fields::*;
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pub use curves::*;
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pub use fields::*;
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/// This represents an element of a group with basic operations that can be
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/// performed. This allows an FFT implementation (for example) to operate
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/// generically over either a field or elliptic curve group.
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pub trait Group: Copy + Clone + Send + Sync + 'static {
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/// The group is assumed to be of prime order $p$. `Scalar` is the
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/// associated scalar field of size $p$.
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type Scalar: FieldExt;
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/// Returns the additive identity of the group.
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fn group_zero() -> Self;
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/// Adds `rhs` to this group element.
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fn group_add(&mut self, rhs: &Self);
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/// Subtracts `rhs` from this group element.
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fn group_sub(&mut self, rhs: &Self);
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/// Scales this group element by a scalar.
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fn group_scale(&mut self, by: &Self::Scalar);
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}
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