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monero-serai: fee calculation parity with Monero's wallet2 (#301)

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* monero-serai: fee calculation parity with Monero's wallet2

* Minor lint

---------

Co-authored-by: Luke Parker <lukeparker5132@gmail.com>
This commit is contained in:
Justin Berman
2023-07-19 12:06:05 -07:00
committed by GitHub
parent 38bcedbf11
commit 228e36a12d
15 changed files with 770 additions and 243 deletions
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45
coins/monero/src/ringct/bulletproofs/mod.rs
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@@ -37,24 +37,41 @@ pub enum Bulletproofs {
}
impl Bulletproofs {
pub(crate) fn fee_weight(plus: bool, outputs: usize) -> usize {
let fields = if plus { 6 } else { 9 };
fn bp_fields(plus: bool) -> usize {
if plus {
6
} else {
9
}
}
// TODO: Shouldn't this use u32/u64?
// https://github.com/monero-project/monero/blob/94e67bf96bbc010241f29ada6abc89f49a81759c/
// src/cryptonote_basic/cryptonote_format_utils.cpp#L106-L124
pub(crate) fn calculate_bp_clawback(plus: bool, n_outputs: usize) -> (usize, usize) {
#[allow(non_snake_case)]
let mut LR_len = usize::try_from(usize::BITS - (outputs - 1).leading_zeros()).unwrap();
let padded_outputs = 1 << LR_len;
let mut LR_len = 0;
let mut n_padded_outputs = 1;
while n_padded_outputs < n_outputs {
LR_len += 1;
n_padded_outputs = 1 << LR_len;
}
LR_len += LOG_N;
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
}
let mut bp_clawback = 0;
if n_padded_outputs > 2 {
let fields = Bulletproofs::bp_fields(plus);
let base = ((fields + (2 * (LOG_N + 1))) * 32) / 2;
let size = (fields + (2 * LR_len)) * 32;
bp_clawback = ((base * n_padded_outputs) - size) * 4 / 5;
}
(bp_clawback, LR_len)
}
pub(crate) fn fee_weight(plus: bool, outputs: usize) -> usize {
#[allow(non_snake_case)]
let (bp_clawback, LR_len) = Bulletproofs::calculate_bp_clawback(plus, outputs);
32 * (Bulletproofs::bp_fields(plus) + (2 * LR_len)) + 2 + bp_clawback
}
/// Prove the list of commitments are within [0 .. 2^64).