Trait elliptic_curve::hash2curve::OsswuMap

pub trait OsswuMap: Field + Sgn0 {
    const PARAMS: OsswuMapParams<Self>;

    // Provided methods
    fn sqrt_ratio_3mod4(u: Self, v: Self) -> (Choice, Self) { ... }
    fn osswu(&self) -> (Self, Self) { ... }
}

Available on crate feature hash2curve only.

The optimized simplified Shallue-van de Woestijne-Ulas method for mapping elliptic curve scalars to affine points.

Required Associated Constants

const PARAMS: OsswuMapParams<Self>

The OSSWU parameters for mapping the field to affine points. For Weierstrass curves having A==0 or B==0, the parameters should be for isogeny where A≠0 and B≠0.

Provided Methods

fn sqrt_ratio_3mod4(u: Self, v: Self) -> (Choice, Self)

Optimized sqrt_ratio for q = 3 mod 4.

fn osswu(&self) -> (Self, Self)

Convert this field element into an affine point on the elliptic curve returning (X, Y). For Weierstrass curves having A==0 or B==0 the result is a point on an isogeny.

Object Safety

This trait is not object safe.

Implementors