mirror of https://github.com/zcash/halo2.git
211 lines
7.1 KiB
Rust
211 lines
7.1 KiB
Rust
use std::iter;
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use super::super::{
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circuit::Expression, ChallengeBeta, ChallengeGamma, ChallengeTheta, ChallengeX,
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};
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use super::Argument;
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use crate::{
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arithmetic::{CurveAffine, FieldExt},
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plonk::{Error, VerifyingKey},
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poly::{multiopen::VerifierQuery, Rotation},
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transcript::{ChallengeSpace, TranscriptRead},
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};
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use ff::Field;
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pub struct PermutationCommitments<C: CurveAffine> {
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permuted_input_commitment: C,
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permuted_table_commitment: C,
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}
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pub struct Committed<C: CurveAffine> {
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permuted: PermutationCommitments<C>,
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product_commitment: C,
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}
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pub struct Evaluated<C: CurveAffine> {
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committed: Committed<C>,
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product_eval: C::Scalar,
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product_inv_eval: C::Scalar,
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permuted_input_eval: C::Scalar,
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permuted_input_inv_eval: C::Scalar,
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permuted_table_eval: C::Scalar,
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}
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impl<F: FieldExt> Argument<F> {
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pub(in crate::plonk) fn read_permuted_commitments<
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C: CurveAffine,
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S: ChallengeSpace<C>,
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T: TranscriptRead<C, S>,
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>(
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&self,
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transcript: &mut T,
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) -> Result<PermutationCommitments<C>, Error> {
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let permuted_input_commitment = transcript
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.read_point()
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.map_err(|_| Error::TranscriptError)?;
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let permuted_table_commitment = transcript
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.read_point()
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.map_err(|_| Error::TranscriptError)?;
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Ok(PermutationCommitments {
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permuted_input_commitment,
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permuted_table_commitment,
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})
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}
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}
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impl<C: CurveAffine> PermutationCommitments<C> {
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pub(in crate::plonk) fn read_product_commitment<
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S: ChallengeSpace<C>,
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T: TranscriptRead<C, S>,
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>(
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self,
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transcript: &mut T,
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) -> Result<Committed<C>, Error> {
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let product_commitment = transcript
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.read_point()
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.map_err(|_| Error::TranscriptError)?;
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Ok(Committed {
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permuted: self,
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product_commitment,
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})
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}
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}
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impl<C: CurveAffine> Committed<C> {
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pub(crate) fn evaluate<S: ChallengeSpace<C>, T: TranscriptRead<C, S>>(
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self,
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transcript: &mut T,
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) -> Result<Evaluated<C>, Error> {
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let product_eval = transcript
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.read_scalar()
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.map_err(|_| Error::TranscriptError)?;
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let product_inv_eval = transcript
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.read_scalar()
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.map_err(|_| Error::TranscriptError)?;
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let permuted_input_eval = transcript
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.read_scalar()
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.map_err(|_| Error::TranscriptError)?;
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let permuted_input_inv_eval = transcript
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.read_scalar()
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.map_err(|_| Error::TranscriptError)?;
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let permuted_table_eval = transcript
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.read_scalar()
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.map_err(|_| Error::TranscriptError)?;
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Ok(Evaluated {
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committed: self,
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product_eval,
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product_inv_eval,
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permuted_input_eval,
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permuted_input_inv_eval,
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permuted_table_eval,
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})
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}
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}
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impl<C: CurveAffine> Evaluated<C> {
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pub(in crate::plonk) fn expressions<'a>(
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&'a self,
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l_0: C::Scalar,
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argument: &'a Argument<C::Scalar>,
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theta: ChallengeTheta<C>,
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beta: ChallengeBeta<C>,
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gamma: ChallengeGamma<C>,
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advice_evals: &[C::Scalar],
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fixed_evals: &[C::Scalar],
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instance_evals: &[C::Scalar],
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) -> impl Iterator<Item = C::Scalar> + 'a {
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let product_expression = || {
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// z'(X) (a'(X) + \beta) (s'(X) + \gamma)
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// - z'(\omega^{-1} X) (\theta^{m-1} a_0(X) + ... + a_{m-1}(X) + \beta) (\theta^{m-1} s_0(X) + ... + s_{m-1}(X) + \gamma)
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let left = self.product_eval
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* &(self.permuted_input_eval + &*beta)
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* &(self.permuted_table_eval + &*gamma);
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let compress_expressions = |expressions: &[Expression<C::Scalar>]| {
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expressions
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.iter()
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.map(|expression| {
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expression.evaluate(
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&|scalar| scalar,
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&|index| fixed_evals[index],
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&|index| advice_evals[index],
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&|index| instance_evals[index],
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&|a, b| a + &b,
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&|a, b| a * &b,
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&|a, scalar| a * &scalar,
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)
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})
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.fold(C::Scalar::zero(), |acc, eval| acc * &*theta + &eval)
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};
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let right = self.product_inv_eval
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* &(compress_expressions(&argument.input_expressions) + &*beta)
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* &(compress_expressions(&argument.table_expressions) + &*gamma);
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left - &right
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};
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std::iter::empty()
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.chain(
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// l_0(X) * (1 - z'(X)) = 0
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Some(l_0 * &(C::Scalar::one() - &self.product_eval)),
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)
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.chain(
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// z'(X) (a'(X) + \beta) (s'(X) + \gamma)
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// - z'(\omega^{-1} X) (\theta^{m-1} a_0(X) + ... + a_{m-1}(X) + \beta) (\theta^{m-1} s_0(X) + ... + s_{m-1}(X) + \gamma)
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Some(product_expression()),
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)
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.chain(Some(
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// l_0(X) * (a'(X) - s'(X)) = 0
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l_0 * &(self.permuted_input_eval - &self.permuted_table_eval),
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))
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.chain(Some(
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// (a′(X)−s′(X))⋅(a′(X)−a′(\omega{-1} X)) = 0
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(self.permuted_input_eval - &self.permuted_table_eval)
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* &(self.permuted_input_eval - &self.permuted_input_inv_eval),
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))
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}
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pub(in crate::plonk) fn queries<'a>(
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&'a self,
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vk: &'a VerifyingKey<C>,
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x: ChallengeX<C>,
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) -> impl Iterator<Item = VerifierQuery<'a, C>> + Clone {
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let x_inv = vk.domain.rotate_omega(*x, Rotation(-1));
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iter::empty()
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// Open lookup product commitments at x
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.chain(Some(VerifierQuery {
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point: *x,
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commitment: &self.committed.product_commitment,
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eval: self.product_eval,
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}))
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// Open lookup input commitments at x
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.chain(Some(VerifierQuery {
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point: *x,
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commitment: &self.committed.permuted.permuted_input_commitment,
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eval: self.permuted_input_eval,
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}))
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// Open lookup table commitments at x
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.chain(Some(VerifierQuery {
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point: *x,
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commitment: &self.committed.permuted.permuted_table_commitment,
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eval: self.permuted_table_eval,
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}))
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// Open lookup input commitments at \omega^{-1} x
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.chain(Some(VerifierQuery {
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point: x_inv,
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commitment: &self.committed.permuted.permuted_input_commitment,
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eval: self.permuted_input_inv_eval,
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}))
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// Open lookup product commitments at \omega^{-1} x
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.chain(Some(VerifierQuery {
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point: x_inv,
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commitment: &self.committed.product_commitment,
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eval: self.product_inv_eval,
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}))
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}
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}
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