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Avoid computing an expensive zero-knowledge proof that is not verified by anyone in the single-decryptor setting. #175

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Merged
copybara-service merged 1 commit into from
Aug 5, 2026
Merged

Avoid computing an expensive zero-knowledge proof that is not verified by anyone in the single-decryptor setting. #175

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10 changes: 7 additions & 3 deletions willow/protocol/single_decryptor.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -49,13 +49,17 @@ where
Vahe: VaheBase + VerifiableKeyGen + KeyGenVerify + PartialDec + AheKeygen,
{
/// Generates the public key directly for single-decryptor mode.
///
/// This method bypasses the committee setup contribution to avoid computing an expensive
/// zero-knowledge proof that is not verified by anyone in the single-decryptor setting.
pub fn create_public_key(
&self,
decryptor_state: &mut DecryptorState<Vahe>,
) -> Result<DecryptorPublicKey<Vahe>, StatusError> {
let setup_contribution = self.decryptor.create_setup_contribution(decryptor_state)?;
let public_key_share = setup_contribution.key_contribution.public_key_share;
self.decryptor.vahe().aggregate_public_key_shares(std::iter::once(&public_key_share))
let (sk_share, pk_share, _) =
self.decryptor.vahe().key_gen(&mut self.decryptor.prng.borrow_mut())?;
decryptor_state.sk_share = Some(sk_share);
self.decryptor.vahe().aggregate_public_key_shares(std::iter::once(&pk_share))
}

/// Handles a partial decryption request by decrypting the accumulated partial dec ciphertexts.
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