ark_bls12_377/fields/
fq2.rs

1use ark_ff::{fields::*, MontFp};
2
3use crate::*;
4
5pub type Fq2 = Fp2<Fq2Config>;
6
7pub struct Fq2Config;
8
9impl Fp2Config for Fq2Config {
10    type Fp = Fq;
11
12    /// NONRESIDUE = -5
13    const NONRESIDUE: Fq = MontFp!("-5");
14
15    /// Coefficients for the Frobenius automorphism.
16    const FROBENIUS_COEFF_FP2_C1: &'static [Fq] = &[
17        // NONRESIDUE**(((q^0) - 1) / 2)
18        Fq::ONE,
19        // NONRESIDUE**(((q^1) - 1) / 2)
20        MontFp!("-1"),
21    ];
22
23    #[inline(always)]
24    fn mul_fp_by_nonresidue_in_place(fe: &mut Self::Fp) -> &mut Self::Fp {
25        fe.neg_in_place();
26        *fe = *fe + fe.double_in_place().double_in_place();
27        fe
28    }
29
30    #[inline(always)]
31    fn sub_and_mul_fp_by_nonresidue(y: &mut Self::Fp, x: &Self::Fp) {
32        let mut original = *y;
33        original += x;
34        y.double_in_place().double_in_place();
35        *y += original;
36    }
37
38    #[inline(always)]
39    fn mul_fp_by_nonresidue_plus_one_and_add(y: &mut Self::Fp, x: &Self::Fp) {
40        y.double_in_place().double_in_place().neg_in_place();
41        *y += x;
42    }
43
44    fn mul_fp_by_nonresidue_and_add(y: &mut Self::Fp, x: &Self::Fp) {
45        let mut original = *y;
46        original.double_in_place().double_in_place();
47        original += &*y;
48        *y = *x;
49        *y -= original;
50    }
51}
ark_bls12_377/fields/fq2.rs

ark_bls12_377/fields/
fq2.rs
