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Replace ATE_LOOP_COUNT with its 2-NAF for MNT curves (#107)

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* Replace ATE_LOOP_COUNT by its 2-NAF

* Add constant references

* Apply suggestions from code review

Co-authored-by: Weikeng Chen <w.k@berkeley.edu>
This commit is contained in:
mmagician
2022-09-02 17:19:51 +02:00
committed by GitHub
parent b433045f4d
commit 42289245a6
4 changed files with 49 additions and 16 deletions
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11
mnt6_298/src/curves/mod.rs
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@@ -25,7 +25,16 @@ impl MNT6Parameters for Parameters {
const TWIST: Fp3<Self::Fp3Config> = Fp3::<Self::Fp3Config>::new(Fq::ZERO, Fq::ONE, Fq::ZERO);
const TWIST_COEFF_A: Fp3<Self::Fp3Config> =
Fp3::<Self::Fp3Config>::new(Fq::ZERO, Fq::ZERO, g1::Parameters::COEFF_A);
const ATE_LOOP_COUNT: &'static [u64] = &[0xdc9a1b671660000, 0x46609756bec2a33f, 0x1eef55];
// https://github.com/o1-labs/snarky/blob/9c21ab2bb23874604640740d646a932e813432c3/snarkette/mnt4_80.ml#L88
const ATE_LOOP_COUNT: &'static [i8] = &[
1, 0, 0, 0, 0, -1, 0, 0, 0, -1, 0, 0, 0, -1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, -1,
0, 1, 0, -1, 0, 0, 0, 0, 0, 1, 0, 1, 0, -1, 0, 0, 0, -1, 0, -1, 0, -1, 0, 0, -1, 0, -1, 0,
0, 0, 0, 0, -1, 0, -1, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, -1, 0, 1, 0, 0, 0, 0, 0, -1,
0, 0, 0, 1, 0, 0, -1, 0, 0, -1, 0, 0, 1, 0, 1, 0, -1, 0, 1, 0, 0, 0, 1, 0, 0, -1, 0, 0, -1,
0, -1, 0, 1, 0, 0, -1, 0, 0, 1, 0, -1, 0, -1, 0, 1, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
];
const ATE_IS_LOOP_COUNT_NEG: bool = true;
const FINAL_EXPONENT_LAST_CHUNK_1: BigInteger320 = BigInt::new([0x1, 0x0, 0x0, 0x0, 0x0]);
const FINAL_EXPONENT_LAST_CHUNK_W0_IS_NEG: bool = true;