ark-curves-cherry-picked/bn254/src/curves/g1.rs

use ark_ec::{
    models::{short_weierstrass::SWCurveConfig, CurveConfig},
    short_weierstrass::Affine,
};
use ark_ff::{Field, MontFp, Zero};

use crate::{Fq, Fr};

#[derive(Clone, Default, PartialEq, Eq)]
pub struct Config;

pub type G1Affine = Affine<Config>;

impl CurveConfig for Config {
    type BaseField = Fq;
    type ScalarField = Fr;

    /// COFACTOR = 1
    const COFACTOR: &'static [u64] = &[0x1];

    /// COFACTOR_INV = COFACTOR^{-1} mod r = 1
    const COFACTOR_INV: Fr = Fr::ONE;
}

impl SWCurveConfig for Config {
    /// COEFF_A = 0
    const COEFF_A: Fq = Fq::ZERO;

    /// COEFF_B = 3
    const COEFF_B: Fq = MontFp!("3");

    /// AFFINE_GENERATOR_COEFFS = (G1_GENERATOR_X, G1_GENERATOR_Y)
    const GENERATOR: G1Affine = G1Affine::new_unchecked(G1_GENERATOR_X, G1_GENERATOR_Y);

    #[inline(always)]
    fn mul_by_a(_: Self::BaseField) -> Self::BaseField {
        Self::BaseField::zero()
    }
}

/// G1_GENERATOR_X = 1
pub const G1_GENERATOR_X: Fq = Fq::ONE;

/// G1_GENERATOR_Y = 2
pub const G1_GENERATOR_Y: Fq = MontFp!("2");