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880565cb81
Preserves the fn accessors within the Monero crates so that we can use statics in some cfgs yet not all (in order to provide support for more low-memory devices) with the exception of `H` (which truly should be cached).
102 lines
2.9 KiB
Rust
102 lines
2.9 KiB
Rust
use std_shims::vec::Vec;
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use curve25519_dalek::{
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constants::ED25519_BASEPOINT_POINT,
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traits::{IsIdentity, VartimeMultiscalarMul},
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scalar::Scalar,
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edwards::EdwardsPoint,
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};
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use monero_generators::{H as MONERO_H, Generators};
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use crate::{original, plus};
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#[derive(Default)]
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pub(crate) struct InternalBatchVerifier {
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pub(crate) g: Scalar,
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pub(crate) h: Scalar,
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pub(crate) g_bold: Vec<Scalar>,
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pub(crate) h_bold: Vec<Scalar>,
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pub(crate) other: Vec<(Scalar, EdwardsPoint)>,
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}
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impl InternalBatchVerifier {
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#[must_use]
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fn verify(self, G: EdwardsPoint, H: EdwardsPoint, generators: &Generators) -> bool {
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let capacity = 2 + self.g_bold.len() + self.h_bold.len() + self.other.len();
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let mut scalars = Vec::with_capacity(capacity);
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let mut points = Vec::with_capacity(capacity);
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scalars.push(self.g);
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points.push(G);
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scalars.push(self.h);
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points.push(H);
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for (i, g_bold) in self.g_bold.into_iter().enumerate() {
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scalars.push(g_bold);
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points.push(generators.G[i]);
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}
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for (i, h_bold) in self.h_bold.into_iter().enumerate() {
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scalars.push(h_bold);
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points.push(generators.H[i]);
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}
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for (scalar, point) in self.other {
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scalars.push(scalar);
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points.push(point);
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}
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EdwardsPoint::vartime_multiscalar_mul(scalars, points).is_identity()
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}
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}
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#[derive(Default)]
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pub(crate) struct BulletproofsBatchVerifier(pub(crate) InternalBatchVerifier);
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impl BulletproofsBatchVerifier {
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#[must_use]
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pub(crate) fn verify(self) -> bool {
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self.0.verify(ED25519_BASEPOINT_POINT, *MONERO_H, &original::GENERATORS)
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}
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}
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#[derive(Default)]
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pub(crate) struct BulletproofsPlusBatchVerifier(pub(crate) InternalBatchVerifier);
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impl BulletproofsPlusBatchVerifier {
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#[must_use]
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pub(crate) fn verify(self) -> bool {
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// Bulletproofs+ is written as per the paper, with G for the value and H for the mask
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// Monero uses H for the value and G for the mask
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self.0.verify(*MONERO_H, ED25519_BASEPOINT_POINT, &plus::GENERATORS)
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}
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}
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/// A batch verifier for Bulletproofs(+).
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///
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/// This uses a fixed layout such that all fixed points only incur a single point scaling,
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/// regardless of the amounts of proofs verified. For all variable points (commitments), they're
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/// accumulated with the fixed points into a single multiscalar multiplication.
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#[derive(Default)]
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pub struct BatchVerifier {
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pub(crate) original: BulletproofsBatchVerifier,
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pub(crate) plus: BulletproofsPlusBatchVerifier,
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}
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impl BatchVerifier {
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/// Create a new batch verifier.
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pub fn new() -> Self {
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Self {
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original: BulletproofsBatchVerifier(InternalBatchVerifier::default()),
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plus: BulletproofsPlusBatchVerifier(InternalBatchVerifier::default()),
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}
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}
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/// Verify all of the proofs queued within this batch verifier.
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///
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/// This uses a variable-time multiscalar multiplication internally.
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#[must_use]
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pub fn verify(self) -> bool {
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self.original.verify() && self.plus.verify()
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}
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}
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