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Implement a DLEq library

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While Serai only needs the simple DLEq which was already present under 
monero, this migrates the implementation of the cross-group DLEq I 
maintain into Serai. This was to have full access to the ecosystem of 
libraries built under Serai while also ensuring support for it.

The cross_group curve, which is extremely experimental, is feature 
flagged off. So is the built in serialization functionality, as this 
should be possible to make nostd once const generics are full featured, 
yet the implemented serialization adds the additional barrier of 
std::io.
This commit is contained in:
Luke Parker
2022-06-30 05:42:29 -04:00
parent 2e168204f0
commit 5d115f1e1c
15 changed files with 854 additions and 111 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
coins/monero/src/ringct/clsag/multisig.rs
View File

@@ -19,7 +19,7 @@ use dalek_ff_group as dfg;
use crate::{
hash_to_point,
frost::{MultisigError, DLEqProof, read_dleq},
frost::{MultisigError, write_dleq, read_dleq},
ringct::clsag::{ClsagInput, Clsag}
};
@@ -133,12 +133,12 @@ impl Algorithm<Ed25519> for ClsagMultisig {
let mut serialized = Vec::with_capacity(ClsagMultisig::serialized_len());
serialized.extend((view.secret_share().0 * self.H).compress().to_bytes());
serialized.extend(DLEqProof::prove(rng, &self.H, &view.secret_share().0).serialize());
serialized.extend(write_dleq(rng, self.H, view.secret_share().0));
serialized.extend((nonces[0].0 * self.H).compress().to_bytes());
serialized.extend(&DLEqProof::prove(rng, &self.H, &nonces[0].0).serialize());
serialized.extend(write_dleq(rng, self.H, nonces[0].0));
serialized.extend((nonces[1].0 * self.H).compress().to_bytes());
serialized.extend(&DLEqProof::prove(rng, &self.H, &nonces[1].0).serialize());
serialized.extend(write_dleq(rng, self.H, nonces[1].0));
serialized
}
@@ -170,18 +170,18 @@ impl Algorithm<Ed25519> for ClsagMultisig {
self.image += read_dleq(
serialized,
cursor,
&self.H,
self.H,
l,
&view.verification_share(l).0
view.verification_share(l)
).map_err(|_| FrostError::InvalidCommitment(l))?.0;
cursor += 96;
self.transcript.append_message(b"commitment_D_H", &serialized[cursor .. (cursor + 32)]);
self.AH.0 += read_dleq(serialized, cursor, &self.H, l, &commitments[0]).map_err(|_| FrostError::InvalidCommitment(l))?;
self.AH.0 += read_dleq(serialized, cursor, self.H, l, commitments[0]).map_err(|_| FrostError::InvalidCommitment(l))?;
cursor += 96;
self.transcript.append_message(b"commitment_E_H", &serialized[cursor .. (cursor + 32)]);
self.AH.1 += read_dleq(serialized, cursor, &self.H, l, &commitments[1]).map_err(|_| FrostError::InvalidCommitment(l))?;
self.AH.1 += read_dleq(serialized, cursor, self.H, l, commitments[1]).map_err(|_| FrostError::InvalidCommitment(l))?;
Ok(())
}