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Bulletproofs+ (#70)

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* Initial stab at Bulletproofs+

Does move around the existing Bulletproofs code, does still work as 
expected.

* Make the Clsag RCTPrunable type work with BP and BP+

* Initial set of BP+ bug fixes

* Further bug fixes

* Remove RING_LEN as a constant

* Monero v16 TX support

Doesn't implement view tags, nor going back to v14, nor the updated BP 
clawback logic.

* Support v14 and v16 at the same time
This commit is contained in:
Luke Parker
2022-07-27 04:05:43 -05:00
committed by GitHub
parent 37b8e3c025
commit 023afaf7ce
15 changed files with 384 additions and 132 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
coins/monero/src/ringct/bulletproofs/mod.rs
View File

@@ -10,11 +10,12 @@ pub(crate) mod scalar_vector;
mod core;
pub(crate) use self::core::Bulletproofs;
use self::core::{MAX_M, prove};
use self::core::{MAX_M, prove, prove_plus};
pub(crate) const MAX_OUTPUTS: usize = MAX_M;
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;
@@ -32,11 +33,12 @@ impl Bulletproofs {
pub fn prove<R: RngCore + CryptoRng>(
rng: &mut R,
outputs: &[Commitment],
plus: bool,
) -> Result<Bulletproofs, TransactionError> {
if outputs.len() > MAX_OUTPUTS {
return Err(TransactionError::TooManyOutputs)?;
}
Ok(prove(rng, outputs))
Ok(if !plus { prove(rng, outputs) } else { prove_plus(rng, outputs) })
}
fn serialize_core<W: std::io::Write, F: Fn(&[EdwardsPoint], &mut W) -> std::io::Result<()>>(
@@ -58,6 +60,17 @@ impl Bulletproofs {
write_scalar(b, w)?;
write_scalar(t, w)
}
Bulletproofs::Plus { A, A1, B, r1, s1, d1, L, R } => {
write_point(A, w)?;
write_point(A1, w)?;
write_point(B, w)?;
write_scalar(r1, w)?;
write_scalar(s1, w)?;
write_scalar(d1, w)?;
specific_write_vec(L, w)?;
specific_write_vec(R, w)
}
}
}
@@ -84,4 +97,17 @@ impl Bulletproofs {
t: read_scalar(r)?,
})
}
pub fn deserialize_plus<R: std::io::Read>(r: &mut R) -> std::io::Result<Bulletproofs> {
Ok(Bulletproofs::Plus {
A: read_point(r)?,
A1: read_point(r)?,
B: read_point(r)?,
r1: read_scalar(r)?,
s1: read_scalar(r)?,
d1: read_scalar(r)?,
L: read_vec(read_point, r)?,
R: read_vec(read_point, r)?,
})
}
}