| 168 | } |
| 169 | |
| 170 | pub fn aggregate(sig_shares: Vec<Self>) -> Result<Signature23G1<E>, BBSPlusError> { |
| 171 | // TODO: Ensure correct threshold. Share should contain threshold and share id |
| 172 | let mut sum_R = E::G1::zero(); |
| 173 | let mut sum_u = E::ScalarField::zero(); |
| 174 | let mut expected_e = E::ScalarField::zero(); |
| 175 | for (i, share) in sig_shares.into_iter().enumerate() { |
| 176 | if i == 0 { |
| 177 | expected_e = share.e; |
| 178 | } else { |
| 179 | if expected_e != share.e { |
| 180 | return Err(BBSPlusError::IncorrectEByParticipant(share.id)); |
| 181 | } |
| 182 | } |
| 183 | sum_u += share.u; |
| 184 | sum_R += share.R; |
| 185 | } |
| 186 | let A = sum_R * sum_u.inverse().unwrap(); |
| 187 | Ok(Signature23G1 { |
| 188 | A: A.into_affine(), |
| 189 | e: expected_e, |
| 190 | }) |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | #[cfg(test)] |