ark-curves-cherry-picked/ed_on_bls12_377/src/fields/fr.rs

use ark_ff::{
    biginteger::{BigInt, BigInteger256 as BigInteger},
    fields::{FftParameters, Fp256, Fp256Parameters, FpParameters},
};

pub type Fr = Fp256<FrParameters>;

pub struct FrParameters;

impl Fp256Parameters for FrParameters {}
impl FftParameters for FrParameters {
    type BigInt = BigInteger;

    const TWO_ADICITY: u32 = 1;

    #[rustfmt::skip]
    const TWO_ADIC_ROOT_OF_UNITY: BigInteger = BigInt::new([
        15170730761708361161u64,
        13670723686578117817u64,
        12803492266614043665u64,
        50861023252832611u64,
    ]);
}
impl FpParameters for FrParameters {
    /// MODULUS = 2111115437357092606062206234695386632838870926408408195193685246394721360383
    #[rustfmt::skip]
    const MODULUS: BigInteger = BigInt::new([
        13356249993388743167u64,
        5950279507993463550u64,
        10965441865914903552u64,
        336320092672043349u64,
    ]);

    const MODULUS_BITS: u32 = 251;

    const CAPACITY: u32 = Self::MODULUS_BITS - 1;

    const REPR_SHAVE_BITS: u32 = 5;

    #[rustfmt::skip]
    const R: BigInteger = BigInt::new([
        16632263305389933622u64,
        10726299895124897348u64,
        16608693673010411502u64,
        285459069419210737u64,
    ]);

    #[rustfmt::skip]
    const R2: BigInteger = BigInt::new([
        3987543627614508126u64,
        17742427666091596403u64,
        14557327917022607905u64,
        322810149704226881u64,
    ]);

    const INV: u64 = 9659935179256617473u64;

    // 70865795004005329077606947863872807680085016823885970091001235374859923341923
    #[rustfmt::skip]
    const GENERATOR: BigInteger = BigInt::new([
        11289572479685143826u64,
        11383637369941080925u64,
        2288212753973340071u64,
        82014976407880291u64,
    ]);

    #[rustfmt::skip]
    const MODULUS_MINUS_ONE_DIV_TWO: BigInteger = BigInt::new([
        6678124996694371583u64,
        2975139753996731775u64,
        14706092969812227584u64,
        168160046336021674u64,
    ]);

    const T: BigInteger = Self::MODULUS_MINUS_ONE_DIV_TWO;

    const T_MINUS_ONE_DIV_TWO: BigInteger = BigInt::new([
        0xae56bba6b0cff67f,
        0x14a4e8ebf10f22bf,
        0x660b44d1e5c37b00,
        0x12ab655e9a2ca55,
    ]);
}