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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
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21
coins/monero/src/ringct/bulletproofs/scalar_vector.rs
View File

@@ -60,6 +60,24 @@ impl ScalarVector {
ScalarVector(res)
}
pub(crate) fn even_powers(x: Scalar, pow: usize) -> ScalarVector {
debug_assert!(pow != 0);
// Verify pow is a power of two
debug_assert_eq!(((pow - 1) & pow), 0);
let xsq = x * x;
let mut res = ScalarVector(Vec::with_capacity(pow / 2));
res.0.push(xsq);
let mut prev = 2;
while prev < pow {
res.0.push(res[res.len() - 1] * xsq);
prev += 2;
}
res
}
pub(crate) fn sum(mut self) -> Scalar {
self.0.drain(..).sum()
}
@@ -86,7 +104,8 @@ pub(crate) fn inner_product(a: &ScalarVector, b: &ScalarVector) -> Scalar {
}
pub(crate) fn weighted_inner_product(a: &ScalarVector, b: &ScalarVector, y: Scalar) -> Scalar {
(a * b * ScalarVector::powers(y, a.len())).sum()
// y ** 0 is not used as a power
(a * b * ScalarVector(ScalarVector::powers(y, a.len() + 1).0[1 ..].to_vec())).sum()
}
impl Mul<&[EdwardsPoint]> for &ScalarVector {