mirror of https://github.com/zcash/orchard.git
Add `orchard::bundle::BatchValidator`
Adapted from the `BatchValidator` in `zcashd`, that only handles RedPallas signatures.
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@ -6,6 +6,9 @@ and this project adheres to Rust's notion of
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[Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [Unreleased]
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### Added
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- `orchard::bundle::BatchValidator`
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### Changed
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- Migrated to `halo2_proofs 0.2`.
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@ -44,6 +44,9 @@ subtle = "2.3"
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zcash_note_encryption = "0.1"
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incrementalmerkletree = "0.3"
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# Logging
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tracing = "0.1"
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# Developer tooling dependencies
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plotters = { version = "0.3.0", optional = true }
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@ -1,7 +1,10 @@
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//! Structs related to bundles of Orchard actions.
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mod batch;
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pub mod commitments;
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pub use batch::BatchValidator;
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use core::fmt;
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use blake2b_simd::Hash as Blake2bHash;
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@ -0,0 +1,74 @@
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use rand::{CryptoRng, RngCore};
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use tracing::debug;
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use super::{Authorized, Bundle};
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use crate::primitives::redpallas::{self, Binding, SpendAuth};
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/// A signature within an authorized Orchard bundle.
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#[derive(Debug)]
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struct BundleSignature {
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/// The signature item for validation.
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signature: redpallas::batch::Item<SpendAuth, Binding>,
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}
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/// Batch validation context for Orchard.
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///
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/// This batch-validates RedPallas signatures.
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#[derive(Debug, Default)]
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pub struct BatchValidator {
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signatures: Vec<BundleSignature>,
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}
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impl BatchValidator {
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/// Constructs a new batch validation context.
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pub fn new() -> Self {
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BatchValidator { signatures: vec![] }
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}
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/// Adds the RedPallas signatures from the given bundle to the validator.
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pub fn add_bundle<V: Copy + Into<i64>>(
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&mut self,
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bundle: &Bundle<Authorized, V>,
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sighash: [u8; 32],
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) {
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for action in bundle.actions().iter() {
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self.signatures.push(BundleSignature {
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signature: action
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.rk()
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.create_batch_item(action.authorization().clone(), &sighash),
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});
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}
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self.signatures.push(BundleSignature {
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signature: bundle
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.binding_validating_key()
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.create_batch_item(bundle.authorization().binding_signature().clone(), &sighash),
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});
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}
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/// Batch-validates the accumulated bundles.
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///
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/// Returns `true` if every signature in every bundle added to the batch validator is
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/// valid, or `false` if one or more are invalid. No attempt is made to figure out
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/// which of the accumulated bundles might be invalid; if that information is desired,
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/// construct separate [`BatchValidator`]s for sub-batches of the bundles.
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pub fn validate<R: RngCore + CryptoRng>(&self, rng: R) -> bool {
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if self.signatures.is_empty() {
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// An empty batch is always valid, but is not free to run; skip it.
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return true;
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}
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let mut validator = redpallas::batch::Verifier::new();
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for sig in self.signatures.iter() {
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validator.queue(sig.signature.clone());
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}
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match validator.verify(rng) {
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Ok(()) => true,
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Err(e) => {
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debug!("RedPallas batch validation failed: {}", e);
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false
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}
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}
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}
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}
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