mirror of https://github.com/zcash/halo2.git
Remove ECC gadgets and instructions
Migrated to the orchard crate: https://github.com/zcash/orchard/pull/22
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//! Self-contained circuit implementations of various primitives.
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pub mod ecc;
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pub mod sha256;
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//! Gadgets and chips for elliptic curve operations.
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use std::fmt;
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use crate::{
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arithmetic::CurveAffine,
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circuit::{Chip, Layouter},
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plonk::Error,
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};
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/// Trait allowing circuit's fixed points to be enumerated.
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pub trait FixedPoints<C: CurveAffine>: Clone + fmt::Debug {}
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/// The set of circuit instructions required to use the ECC gadgets.
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pub trait EccInstructions<C: CurveAffine>: Chip<Field = C::Base> {
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/// Variable representing an element of the elliptic curve's scalar field.
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type Scalar: Clone + fmt::Debug;
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/// Variable representing an elliptic curve point.
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type Point: Clone + fmt::Debug;
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/// Variable representing the set of fixed bases in the circuit.
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type FixedPoints: FixedPoints<C>;
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/// Variable representing a fixed elliptic curve point (constant in the circuit).
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type FixedPoint: Clone + fmt::Debug;
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/// Witnesses the given scalar as a private input to the circuit.
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fn witness_scalar(
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layouter: &mut impl Layouter<Self>,
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value: Option<C::Scalar>,
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) -> Result<Self::Scalar, Error>;
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/// Witnesses the given point as a private input to the circuit.
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fn witness_point(
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layouter: &mut impl Layouter<Self>,
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value: Option<C>,
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) -> Result<Self::Point, Error>;
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/// Gets a fixed point into the circuit.
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fn get_fixed(
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layouter: &mut impl Layouter<Self>,
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fixed_points: Self::FixedPoints,
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) -> Result<Self::FixedPoint, Error>;
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/// Performs point addition, returning `a + b`.
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fn add(
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layouter: &mut impl Layouter<Self>,
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a: &Self::Point,
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b: &Self::Point,
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) -> Result<Self::Point, Error>;
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/// Performs point doubling, returning `[2] a`.
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fn double(layouter: &mut impl Layouter<Self>, a: &Self::Point) -> Result<Self::Point, Error>;
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/// Performs variable-base scalar multiplication, returning `[scalar] base`.
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fn mul(
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layouter: &mut impl Layouter<Self>,
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scalar: &Self::Scalar,
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base: &Self::Point,
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) -> Result<Self::Point, Error>;
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/// Performs fixed-base scalar multiplication, returning `[scalar] base`.
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fn mul_fixed(
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layouter: &mut impl Layouter<Self>,
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scalar: &Self::Scalar,
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base: &Self::FixedPoint,
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) -> Result<Self::Point, Error>;
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}
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/// An element of the given elliptic curve's scalar field.
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#[derive(Debug)]
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pub struct Scalar<C: CurveAffine, EccChip: EccInstructions<C>> {
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inner: EccChip::Scalar,
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}
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impl<C: CurveAffine, EccChip: EccInstructions<C>> Scalar<C, EccChip> {
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/// Constructs a new point with the given value.
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pub fn new(
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mut layouter: impl Layouter<EccChip>,
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value: Option<C::Scalar>,
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) -> Result<Self, Error> {
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EccChip::witness_scalar(&mut layouter, value).map(|inner| Scalar { inner })
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}
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}
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/// An elliptic curve point over the given curve.
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#[derive(Debug)]
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pub struct Point<C: CurveAffine, EccChip: EccInstructions<C>> {
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inner: EccChip::Point,
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}
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impl<C: CurveAffine, EccChip: EccInstructions<C>> Point<C, EccChip> {
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/// Constructs a new point with the given value.
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pub fn new(mut layouter: impl Layouter<EccChip>, value: Option<C>) -> Result<Self, Error> {
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EccChip::witness_point(&mut layouter, value).map(|inner| Point { inner })
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}
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/// Returns `self + other`.
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pub fn add(&self, mut layouter: impl Layouter<EccChip>, other: &Self) -> Result<Self, Error> {
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EccChip::add(&mut layouter, &self.inner, &other.inner).map(|inner| Point { inner })
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}
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/// Returns `[2] self`.
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pub fn double(&self, mut layouter: impl Layouter<EccChip>) -> Result<Self, Error> {
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EccChip::double(&mut layouter, &self.inner).map(|inner| Point { inner })
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}
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/// Returns `[by] self`.
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pub fn mul(
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&self,
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mut layouter: impl Layouter<EccChip>,
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by: &Scalar<C, EccChip>,
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) -> Result<Self, Error> {
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EccChip::mul(&mut layouter, &by.inner, &self.inner).map(|inner| Point { inner })
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}
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}
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/// A constant elliptic curve point over the given curve, for which scalar multiplication
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/// is more efficient.
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#[derive(Debug)]
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pub struct FixedPoint<C: CurveAffine, EccChip: EccInstructions<C>> {
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inner: EccChip::FixedPoint,
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}
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impl<C: CurveAffine, EccChip: EccInstructions<C>> FixedPoint<C, EccChip> {
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/// Gets a reference to the specified fixed point in the circuit.
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pub fn get(
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mut layouter: impl Layouter<EccChip>,
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point: EccChip::FixedPoints,
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) -> Result<Self, Error> {
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EccChip::get_fixed(&mut layouter, point).map(|inner| FixedPoint { inner })
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}
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/// Returns `[by] self`.
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pub fn mul(
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&self,
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mut layouter: impl Layouter<EccChip>,
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by: &Scalar<C, EccChip>,
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) -> Result<Point<C, EccChip>, Error> {
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EccChip::mul_fixed(&mut layouter, &by.inner, &self.inner).map(|inner| Point { inner })
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}
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}
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