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added combine_signatures_with_threshold #119

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added combine_signatures_with_threshold #119

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13 changes: 13 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -614,6 +614,19 @@ impl PublicKeySet {
Ok(Signature(interpolate(self.commit.degree(), samples)?))
}

/// Combines the shares into a signature that can be verified with the main public key. taking a threshold value as argument
pub fn combine_signatures_with_threshold<'a, T, I>(
threshold: usize,
shares: I,
) -> Result<Signature>
where
I: IntoIterator<Item = (T, &'a SignatureShare)>,
T: IntoFr,
{
let samples = shares.into_iter().map(|(i, share)| (i, &(share.0).0));
Ok(Signature(interpolate(threshold, samples)?))
}

/// Combines the shares to decrypt the ciphertext.
pub fn decrypt<'a, T, I>(&self, shares: I, ct: &Ciphertext) -> Result<Vec<u8>>
where
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