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Properly invert when computing expected opening.

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Sean Bowe 2020-08-27 10:16:42 -06:00
parent ad106f1119
commit 9099e9d9ba
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GPG key ID: 95684257D8F8B031
1 changed files with 1 additions and 51 deletions
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52
src/plonk/verifier.rs
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@ -56,7 +56,7 @@ impl<C: CurveAffine> Proof<C> {
h_eval += &evaluation;
}
let xn = x_3.pow(&[params.n as u64, 0, 0, 0]);
h_eval *= &(xn - &C::Scalar::one());
h_eval *= &(xn - &C::Scalar::one()).invert().unwrap();
// Compute the expected h(x) value
let mut expected_h_eval = C::Scalar::zero();
@ -183,55 +183,5 @@ impl<C: CurveAffine> Proof<C> {
&f_commitment.to_affine(),
f_eval,
)
/*
let mut q_commitment = self.h_commitments[0].clone().to_projective();
let mut expected_opening = self.h_evals_x[0];
{
let mut accumulate = |commitment: C, opening: C::Scalar| {
q_commitment = commitment.to_projective() + &(q_commitment * y);
expected_opening = opening + &(expected_opening * &y);
};
for (commitment, eval) in self.h_commitments.iter().zip(self.h_evals_x.iter()).skip(1) {
accumulate(*commitment, *eval);
}
accumulate(self.a_commitment, self.a_eval_x);
accumulate(self.b_commitment, self.b_eval_x);
accumulate(self.c_commitment, self.c_eval_x);
accumulate(self.d_commitment, self.d_eval_x);
accumulate(srs.sa_commitment, self.sa_eval_x);
accumulate(srs.sb_commitment, self.sb_eval_x);
accumulate(srs.sc_commitment, self.sc_eval_x);
accumulate(srs.sd_commitment, self.sd_eval_x);
accumulate(srs.sm_commitment, self.sm_eval_x);
}
let q_commitment = q_commitment.to_affine();
let xn = x.pow(&[params.n as u64, 0, 0, 0]);
// Compute the expected h(x) value
let mut h_eval_x = C::Scalar::zero();
let mut cur = C::Scalar::one();
for eval in &self.h_evals_x {
h_eval_x += &(cur * eval);
cur *= &xn;
}
// Check that the circuit is satisfied.
// (a * sa) + (b * sb) + (a * sm * b) + (d * sd) - (c * sc)
if self.a_eval_x * &self.sa_eval_x
+ &(self.b_eval_x * &self.sb_eval_x)
+ &(self.a_eval_x * &self.sm_eval_x * &self.b_eval_x)
+ &(self.d_eval_x * &self.sd_eval_x)
- &(self.c_eval_x * &self.sc_eval_x)
!= h_eval_x * &(xn - &C::Scalar::one())
{
return false;
}
*/
}
}