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Add fee handling code to Monero

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Updates how change outputs are handled, with a far more logical 
construction offering greater flexibility.

prepare_outputs can not longer error. SignaableTransaction::new will.
This commit is contained in:
Luke Parker
2022-06-19 12:03:01 -04:00
parent 71fca06120
commit f50f249468
11 changed files with 231 additions and 107 deletions
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18
coins/monero/src/ringct/bulletproofs.rs
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@@ -6,6 +6,8 @@ use curve25519_dalek::{scalar::Scalar, edwards::EdwardsPoint};
use crate::{Commitment, wallet::TransactionError, serialize::*};
pub(crate) const MAX_OUTPUTS: usize = 16;
#[derive(Clone, PartialEq, Debug)]
pub struct Bulletproofs {
pub A: EdwardsPoint,
@@ -22,8 +24,22 @@ pub struct Bulletproofs {
}
impl Bulletproofs {
pub(crate) fn fee_weight(outputs: usize) -> usize {
let proofs = 6 + usize::try_from(usize::BITS - (outputs - 1).leading_zeros()).unwrap();
let len = (9 + (2 * proofs)) * 32;
let mut clawback = 0;
let padded = 1 << (proofs - 6);
if padded > 2 {
const BP_BASE: usize = 368;
clawback = ((BP_BASE * padded) - len) * 4 / 5;
}
len + clawback
}
pub fn new<R: RngCore + CryptoRng>(rng: &mut R, outputs: &[Commitment]) -> Result<Bulletproofs, TransactionError> {
if outputs.len() > 16 {
if outputs.len() > MAX_OUTPUTS {
return Err(TransactionError::TooManyOutputs)?;
}