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Implement simple random mixin selection which passes sanity

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This commit is contained in:
Luke Parker
2022-05-04 06:24:52 -04:00
parent 9a42391b75
commit f856faa762
4 changed files with 230 additions and 59 deletions
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30
coins/monero/src/transaction/mod.rs
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@@ -71,6 +71,7 @@ pub enum TransactionError {
pub struct SpendableOutput {
pub tx: Hash,
pub o: usize,
pub key: EdwardsPoint,
pub key_offset: Scalar,
pub commitment: Commitment
}
@@ -126,7 +127,7 @@ pub fn scan(tx: &Transaction, view: Scalar, spend: EdwardsPoint) -> Vec<Spendabl
}
}
res.push(SpendableOutput { tx: tx.hash(), o, key_offset, commitment });
res.push(SpendableOutput { tx: tx.hash(), o, key: output_key, key_offset, commitment });
break;
}
}
@@ -191,26 +192,31 @@ impl Output {
}
}
async fn prepare_inputs(
async fn prepare_inputs<R: RngCore + CryptoRng>(
rng: &mut R,
rpc: &Rpc,
spend: &Scalar,
inputs: &[SpendableOutput],
spend: &Scalar,
tx: &mut Transaction
) -> Result<Vec<(Scalar, clsag::Input, EdwardsPoint)>, TransactionError> {
// TODO sort inputs
let mut signable = Vec::with_capacity(inputs.len());
for (i, input) in inputs.iter().enumerate() {
// Select mixins
let (m, mixins) = mixins::select(
rpc.get_o_indexes(input.tx).await.map_err(|e| TransactionError::RpcError(e))?[input.o]
);
// Select mixins
let mixins = mixins::select(
rng,
rpc,
rpc.get_height().await.map_err(|e| TransactionError::RpcError(e))?,
inputs
).await.map_err(|e| TransactionError::RpcError(e))?;
for (i, input) in inputs.iter().enumerate() {
signable.push((
spend + input.key_offset,
clsag::Input::new(
rpc.get_ring(&mixins).await.map_err(|e| TransactionError::RpcError(e))?,
m,
mixins[i].2.clone(),
mixins[i].1,
input.commitment
).map_err(|e| TransactionError::ClsagError(e))?,
key_image::generate(&(spend + input.key_offset))
@@ -218,7 +224,7 @@ async fn prepare_inputs(
tx.prefix.inputs.push(TxIn::ToKey {
amount: VarInt(0),
key_offsets: mixins::offset(&mixins).iter().map(|x| VarInt(*x)).collect(),
key_offsets: mixins[i].0.clone(),
k_image: KeyImage { image: Hash(signable[i].2.compress().to_bytes()) }
});
}
@@ -360,7 +366,7 @@ impl SignableTransaction {
let (commitments, mask_sum) = self.prepare_outputs(rng)?;
let mut tx = self.prepare_transaction(&commitments, bulletproofs::generate(&commitments)?);
let signable = prepare_inputs(rpc, spend, &self.inputs, &mut tx).await?;
let signable = prepare_inputs(rng, rpc, &self.inputs, spend, &mut tx).await?;
let clsags = clsag::sign(
rng,