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Update BP fee_weight

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Closes https://github.com/serai-dex/serai/issues/8.
This commit is contained in:
Luke Parker
2022-08-21 10:35:10 -04:00
parent 755d021f8e
commit 60d93c4b2d
5 changed files with 37 additions and 33 deletions
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27
coins/monero/src/ringct/bulletproofs/mod.rs
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@@ -11,6 +11,7 @@ use crate::{Commitment, wallet::TransactionError, serialize::*};
pub(crate) mod scalar_vector;
pub(crate) mod core;
use self::core::LOG_N;
pub(crate) mod original;
pub(crate) mod plus;
@@ -28,19 +29,23 @@ pub enum Bulletproofs {
}
impl Bulletproofs {
// TODO
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;
pub(crate) fn fee_weight(plus: bool, outputs: usize) -> usize {
let fields = if plus { 6 } else { 9 };
let mut clawback = 0;
let padded = 1 << (proofs - 6);
if padded > 2 {
const BP_BASE: usize = 368;
clawback = ((BP_BASE * padded) - len) * 4 / 5;
}
#[allow(non_snake_case)]
let mut LR_len = usize::try_from(usize::BITS - (outputs - 1).leading_zeros()).unwrap();
let padded_outputs = 1 << LR_len;
LR_len += LOG_N;
len + clawback
let len = (fields + (2 * LR_len)) * 32;
len +
if padded_outputs <= 2 {
0
} else {
let base = ((fields + (2 * (LOG_N + 1))) * 32) / 2;
let size = (fields + (2 * LR_len)) * 32;
((base * padded_outputs) - size) * 4 / 5
}
}
pub fn prove<R: RngCore + CryptoRng>(