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Allow downsize on verifier params #7

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Allow downsize on verifier params #7

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2a0b0bd
Allow downsize on verifier params.
tkerber Apr 29, 2024
b7e49d5
Ensure downsize trims when required.
tkerber Apr 29, 2024
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11 changes: 8 additions & 3 deletions halo2_proofs/src/poly/kzg/commitment.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -474,9 +474,14 @@ where
self.n
}

fn downsize(&mut self, _k: u32) {
// Verifier parameters cannot be downsized since they do not contain the original powers of g.
panic!("Verifier parameters cannot be downsized. You may want to use `trim` instead.")
fn downsize(&mut self, k: u32) {
assert!(k <= self.k);
let n = 1 << k;
if n < self.trimed_size {
*self = self.clone().trim(n as usize);
}
self.k = k;
self.n = n as u64;
}

fn empty_msm(&'params self) -> MSMKZG<E> {
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