ark_ec/hashing/curve_maps/
mod.rs

1use ark_ff::{BigInteger, Field, PrimeField, Zero};
2pub mod elligator2;
3pub mod swu;
4pub mod wb;
5
6//// parity method on the Field elements based on [\[1\]] Section 4.1
7//// which is used by multiple curve maps including Elligator2 and SWU
8/// - [\[1\]] <https://datatracker.ietf.org/doc/html/rfc9380/>
9pub fn parity<F: Field>(element: &F) -> bool {
10    element
11        .to_base_prime_field_elements()
12        .find(|&x| !x.is_zero())
13        .map_or(false, |x| x.into_bigint().is_odd())
14}