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// use bellperson::groth16;
// use blstrs::Bls12;
// use group::GroupEncoding;
// use rand_core::{CryptoRng, RngCore};
// use zcash_primitives::transaction::components::sapling::{Authorized, Bundle};
// use super::SaplingVerificationContextInner;
// /// Batch validation context for Sapling.
// ///
// /// This batch-validates Spend and Output proofs, and RedJubjub signatures.
// ///
// /// Signatures are verified assuming ZIP 216 is active.
// pub struct BatchValidator {
// bundles_added: bool,
// spend_proofs: groth16::batch::Verifier<Bls12>,
// output_proofs: groth16::batch::Verifier<Bls12>,
// signatures: redjubjub::batch::Verifier,
// }
// impl Default for BatchValidator {
// fn default() -> Self {
// Self::new()
// }
// }
// impl BatchValidator {
// /// Constructs a new batch validation context.
// pub fn new() -> Self {
// BatchValidator {
// bundles_added: false,
// spend_proofs: groth16::batch::Verifier::new(),
// output_proofs: groth16::batch::Verifier::new(),
// signatures: redjubjub::batch::Verifier::new(),
// }
// }
// /// Checks the bundle against Sapling-specific consensus rules, and adds its proof and
// /// signatures to the validator.
// ///
// /// Returns `false` if the bundle doesn't satisfy all of the consensus rules. This
// /// `BatchValidator` can continue to be used regardless, but some or all of the proofs
// /// and signatures from this bundle may have already been added to the batch even if
// /// it fails other consensus rules.
// pub fn check_bundle(&mut self, bundle: Bundle<Authorized>, sighash: [u8; 32]) -> bool {
// self.bundles_added = true;
// let mut ctx = SaplingVerificationContextInner::new();
// for spend in bundle.shielded_spends {
// // Deserialize the proof
// let zkproof = match groth16::Proof::read(&spend.zkproof[..]) {
// Ok(p) => p,
// Err(_) => return false,
// };
// // Check the Spend consensus rules, and batch its proof and spend
// // authorization signature.
// let consensus_rules_passed = ctx.check_spend(
// spend.cv,
// spend.anchor,
// &spend.nullifier.0,
// spend.rk,
// &sighash,
// spend.spend_auth_sig,
// zkproof,
// self,
// |this, rk, _, spend_auth_sig| {
// let rk = redjubjub::VerificationKeyBytes::<redjubjub::SpendAuth>::from(
// rk.0.to_bytes(),
// );
// let spend_auth_sig = {
// let mut buf = [0; 64];
// spend_auth_sig.write(&mut buf[..]).unwrap();
// redjubjub::Signature::<redjubjub::SpendAuth>::from(buf)
// };
// this.signatures.queue((rk, spend_auth_sig, &sighash));
// true
// },
// |this, proof, public_inputs| {
// this.spend_proofs.queue((proof, public_inputs.to_vec()));
// true
// },
// );
// if !consensus_rules_passed {
// return false;
// }
// }
// for output in bundle.shielded_outputs {
// // Deserialize the ephemeral key
// let epk = match ironfish_jubjub::ExtendedPoint::from_bytes(&output.ephemeral_key.0).into() {
// Some(p) => p,
// None => return false,
// };
// // Deserialize the proof
// let zkproof = match groth16::Proof::read(&output.zkproof[..]) {
// Ok(p) => p,
// Err(_) => return false,
// };
// // Check the Output consensus rules, and batch its proof.
// let consensus_rules_passed = ctx.check_output(
// output.cv,
// output.cmu,
// epk,
// zkproof,
// |proof, public_inputs| {
// self.output_proofs.queue((proof, public_inputs.to_vec()));
// true
// },
// );
// if !consensus_rules_passed {
// return false;
// }
// }
// // Check the whole-bundle consensus rules, and batch the binding signature.
// ctx.final_check(
// bundle.value_balance,
// &sighash,
// bundle.authorization.binding_sig,
// |bvk, _, binding_sig| {
// let bvk =
// redjubjub::VerificationKeyBytes::<redjubjub::Binding>::from(bvk.0.to_bytes());
// let binding_sig = {
// let mut buf = [0; 64];
// binding_sig.write(&mut buf[..]).unwrap();
// redjubjub::Signature::<redjubjub::Binding>::from(buf)
// };
// self.signatures.queue((bvk, binding_sig, &sighash));
// true
// },
// )
// }
// /// Batch-validates the accumulated bundles.
// ///
// /// Returns `true` if every proof and signature in every bundle added to the batch
// /// validator is valid, or `false` if one or more are invalid. No attempt is made to
// /// figure out which of the accumulated bundles might be invalid; if that information
// /// is desired, construct separate [`BatchValidator`]s for sub-batches of the bundles.
// pub fn validate<R: RngCore + CryptoRng>(
// self,
// spend_vk: &groth16::VerifyingKey<Bls12>,
// output_vk: &groth16::VerifyingKey<Bls12>,
// mut rng: R,
// ) -> bool {
// if !self.bundles_added {
// // An empty batch is always valid, but is not free to run; skip it.
// return true;
// }
// if let Err(e) = self.signatures.verify(&mut rng) {
// tracing::debug!("Signature batch validation failed: {}", e);
// return false;
// }
// #[cfg(feature = "multicore")]
// let verify_proofs = |batch: groth16::batch::Verifier<Bls12>, vk| batch.verify_multicore(vk);
// #[cfg(not(feature = "multicore"))]
// let mut verify_proofs =
// |batch: groth16::batch::Verifier<Bls12>, vk| batch.verify(&mut rng, vk);
// if verify_proofs(self.spend_proofs, spend_vk).is_err() {
// tracing::debug!("Spend proof batch validation failed");
// return false;
// }
// if verify_proofs(self.output_proofs, output_vk).is_err() {
// tracing::debug!("Output proof batch validation failed");
// return false;
// }
// true
// }
// }