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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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10
coins/monero/src/ringct/mod.rs
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@@ -124,8 +124,9 @@ pub struct RctBase {
}
impl RctBase {
pub(crate) fn fee_weight(outputs: usize) -> usize {
1 + 8 + (outputs * (8 + 32))
pub(crate) fn fee_weight(outputs: usize, fee: u64) -> usize {
// 1 byte for the RCT signature type
1 + (outputs * (8 + 32)) + varint_len(fee)
}
pub fn write<W: Write>(&self, w: &mut W, rct_type: RctType) -> io::Result<()> {
@@ -211,6 +212,7 @@ pub enum RctPrunable {
impl RctPrunable {
pub(crate) fn fee_weight(protocol: Protocol, inputs: usize, outputs: usize) -> usize {
// 1 byte for number of BPs (technically a VarInt, yet there's always just zero or one)
1 + Bulletproofs::fee_weight(protocol.bp_plus(), outputs) +
(inputs * (Clsag::fee_weight(protocol.ring_len()) + 32))
}
@@ -377,8 +379,8 @@ impl RctSignatures {
}
}
pub(crate) fn fee_weight(protocol: Protocol, inputs: usize, outputs: usize) -> usize {
RctBase::fee_weight(outputs) + RctPrunable::fee_weight(protocol, inputs, outputs)
pub(crate) fn fee_weight(protocol: Protocol, inputs: usize, outputs: usize, fee: u64) -> usize {
RctBase::fee_weight(outputs, fee) + RctPrunable::fee_weight(protocol, inputs, outputs)
}
pub fn write<W: Write>(&self, w: &mut W) -> io::Result<()> {