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Rename Bulletproofs to Bulletproof, since they are a single Bulletproof

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Also bifurcates prove with prove_plus, and adds a few documentation items.
This commit is contained in:
Luke Parker
2024-04-22 00:00:14 -04:00
parent fccb1aea51
commit 372e29fe08
5 changed files with 80 additions and 52 deletions
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83
coins/monero/src/ringct/bulletproofs/mod.rs
View File

@@ -26,15 +26,15 @@ use self::plus::*;
pub(crate) const MAX_OUTPUTS: usize = self::core::MAX_M;
/// Bulletproofs enum, supporting the original and plus formulations.
/// Bulletproof enum, encapsulating both Bulletproofs and Bulletproofs+.
#[allow(clippy::large_enum_variant)]
#[derive(Clone, PartialEq, Eq, Debug)]
pub enum Bulletproofs {
pub enum Bulletproof {
Original(OriginalStruct),
Plus(AggregateRangeProof),
}
impl Bulletproofs {
impl Bulletproof {
fn bp_fields(plus: bool) -> usize {
if plus {
6
@@ -57,7 +57,7 @@ impl Bulletproofs {
let mut bp_clawback = 0;
if n_padded_outputs > 2 {
let fields = Bulletproofs::bp_fields(plus);
let fields = Bulletproof::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;
@@ -68,40 +68,49 @@ impl Bulletproofs {
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
let (bp_clawback, LR_len) = Bulletproof::calculate_bp_clawback(plus, outputs);
32 * (Bulletproof::bp_fields(plus) + (2 * LR_len)) + 2 + bp_clawback
}
/// Prove the list of commitments are within [0 .. 2^64).
/// Prove the list of commitments are within [0 .. 2^64) with an aggregate Bulletproof.
pub fn prove<R: RngCore + CryptoRng>(
rng: &mut R,
outputs: &[Commitment],
plus: bool,
) -> Result<Bulletproofs, TransactionError> {
) -> Result<Bulletproof, TransactionError> {
if outputs.is_empty() {
Err(TransactionError::NoOutputs)?;
}
if outputs.len() > MAX_OUTPUTS {
Err(TransactionError::TooManyOutputs)?;
}
Ok(if !plus {
Bulletproofs::Original(OriginalStruct::prove(rng, outputs))
} else {
Bulletproofs::Plus(
AggregateRangeStatement::new(outputs.iter().map(Commitment::calculate).collect())
.unwrap()
.prove(rng, &Zeroizing::new(AggregateRangeWitness::new(outputs.to_vec()).unwrap()))
.unwrap(),
)
})
Ok(Bulletproof::Original(OriginalStruct::prove(rng, outputs)))
}
/// Verify the given Bulletproofs.
/// Prove the list of commitments are within [0 .. 2^64) with an aggregate Bulletproof+.
pub fn prove_plus<R: RngCore + CryptoRng>(
rng: &mut R,
outputs: Vec<Commitment>,
) -> Result<Bulletproof, TransactionError> {
if outputs.is_empty() {
Err(TransactionError::NoOutputs)?;
}
if outputs.len() > MAX_OUTPUTS {
Err(TransactionError::TooManyOutputs)?;
}
Ok(Bulletproof::Plus(
AggregateRangeStatement::new(outputs.iter().map(Commitment::calculate).collect())
.unwrap()
.prove(rng, &Zeroizing::new(AggregateRangeWitness::new(outputs).unwrap()))
.unwrap(),
))
}
/// Verify the given Bulletproof(+).
#[must_use]
pub fn verify<R: RngCore + CryptoRng>(&self, rng: &mut R, commitments: &[EdwardsPoint]) -> bool {
match self {
Bulletproofs::Original(bp) => bp.verify(rng, commitments),
Bulletproofs::Plus(bp) => {
Bulletproof::Original(bp) => bp.verify(rng, commitments),
Bulletproof::Plus(bp) => {
let mut verifier = BatchVerifier::new(1);
let Some(statement) = AggregateRangeStatement::new(commitments.to_vec()) else {
return false;
@@ -114,9 +123,11 @@ impl Bulletproofs {
}
}
/// Accumulate the verification for the given Bulletproofs into the specified BatchVerifier.
/// Returns false if the Bulletproofs aren't sane, without mutating the BatchVerifier.
/// Returns true if the Bulletproofs are sane, regardless of their validity.
/// Accumulate the verification for the given Bulletproof into the specified BatchVerifier.
///
/// Returns false if the Bulletproof isn't sane, leaving the BatchVerifier in an undefined
/// state.
/// Returns true if the Bulletproof is sane, regardless of their validity.
#[must_use]
pub fn batch_verify<ID: Copy + Zeroize, R: RngCore + CryptoRng>(
&self,
@@ -126,8 +137,8 @@ impl Bulletproofs {
commitments: &[EdwardsPoint],
) -> bool {
match self {
Bulletproofs::Original(bp) => bp.batch_verify(rng, verifier, id, commitments),
Bulletproofs::Plus(bp) => {
Bulletproof::Original(bp) => bp.batch_verify(rng, verifier, id, commitments),
Bulletproof::Plus(bp) => {
let Some(statement) = AggregateRangeStatement::new(commitments.to_vec()) else {
return false;
};
@@ -142,7 +153,7 @@ impl Bulletproofs {
specific_write_vec: F,
) -> io::Result<()> {
match self {
Bulletproofs::Original(bp) => {
Bulletproof::Original(bp) => {
write_point(&bp.A, w)?;
write_point(&bp.S, w)?;
write_point(&bp.T1, w)?;
@@ -156,7 +167,7 @@ impl Bulletproofs {
write_scalar(&bp.t, w)
}
Bulletproofs::Plus(bp) => {
Bulletproof::Plus(bp) => {
write_point(&bp.A.0, w)?;
write_point(&bp.wip.A.0, w)?;
write_point(&bp.wip.B.0, w)?;
@@ -173,19 +184,21 @@ impl Bulletproofs {
self.write_core(w, |points, w| write_raw_vec(write_point, points, w))
}
/// Write the Bulletproof(+) to a writer.
pub fn write<W: Write>(&self, w: &mut W) -> io::Result<()> {
self.write_core(w, |points, w| write_vec(write_point, points, w))
}
/// Serialize the Bulletproof(+) to a Vec<u8>.
pub fn serialize(&self) -> Vec<u8> {
let mut serialized = vec![];
self.write(&mut serialized).unwrap();
serialized
}
/// Read Bulletproofs.
pub fn read<R: Read>(r: &mut R) -> io::Result<Bulletproofs> {
Ok(Bulletproofs::Original(OriginalStruct {
/// Read a Bulletproof.
pub fn read<R: Read>(r: &mut R) -> io::Result<Bulletproof> {
Ok(Bulletproof::Original(OriginalStruct {
A: read_point(r)?,
S: read_point(r)?,
T1: read_point(r)?,
@@ -200,11 +213,11 @@ impl Bulletproofs {
}))
}
/// Read Bulletproofs+.
pub fn read_plus<R: Read>(r: &mut R) -> io::Result<Bulletproofs> {
/// Read a Bulletproof+.
pub fn read_plus<R: Read>(r: &mut R) -> io::Result<Bulletproof> {
use dalek_ff_group::{Scalar as DfgScalar, EdwardsPoint as DfgPoint};
Ok(Bulletproofs::Plus(AggregateRangeProof {
Ok(Bulletproof::Plus(AggregateRangeProof {
A: DfgPoint(read_point(r)?),
wip: WipProof {
A: DfgPoint(read_point(r)?),

16
coins/monero/src/ringct/mod.rs
View File

@@ -23,7 +23,7 @@ pub mod bulletproofs;
use crate::{
Protocol,
serialize::*,
ringct::{mlsag::Mlsag, clsag::Clsag, borromean::BorromeanRange, bulletproofs::Bulletproofs},
ringct::{mlsag::Mlsag, clsag::Clsag, borromean::BorromeanRange, bulletproofs::Bulletproof},
};
/// Generate a key image for a given key. Defined as `x * hash_to_point(xG)`.
@@ -199,12 +199,12 @@ pub enum RctPrunable {
mlsags: Vec<Mlsag>,
},
MlsagBulletproofs {
bulletproofs: Bulletproofs,
bulletproofs: Bulletproof,
mlsags: Vec<Mlsag>,
pseudo_outs: Vec<EdwardsPoint>,
},
Clsag {
bulletproofs: Bulletproofs,
bulletproofs: Bulletproof,
clsags: Vec<Clsag>,
pseudo_outs: Vec<EdwardsPoint>,
},
@@ -213,7 +213,7 @@ 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) +
1 + Bulletproof::fee_weight(protocol.bp_plus(), outputs) +
(inputs * (Clsag::fee_weight(protocol.ring_len()) + 32))
}
@@ -294,7 +294,7 @@ impl RctPrunable {
{
Err(io::Error::other("n bulletproofs instead of one"))?;
}
Bulletproofs::read(r)?
Bulletproof::read(r)?
},
mlsags: (0 .. inputs)
.map(|_| Mlsag::read(ring_length, 2, r))
@@ -307,9 +307,7 @@ impl RctPrunable {
if read_varint::<_, u64>(r)? != 1 {
Err(io::Error::other("n bulletproofs instead of one"))?;
}
(if rct_type == RctType::Clsag { Bulletproofs::read } else { Bulletproofs::read_plus })(
r,
)?
(if rct_type == RctType::Clsag { Bulletproof::read } else { Bulletproof::read_plus })(r)?
},
clsags: (0 .. inputs).map(|_| Clsag::read(ring_length, r)).collect::<Result<_, _>>()?,
pseudo_outs: read_raw_vec(read_point, inputs, r)?,
@@ -360,7 +358,7 @@ impl RctSignatures {
}
}
RctPrunable::Clsag { bulletproofs, .. } => {
if matches!(bulletproofs, Bulletproofs::Original { .. }) {
if matches!(bulletproofs, Bulletproof::Original { .. }) {
RctType::Clsag
} else {
RctType::BulletproofsPlus