58 lines
2.0 KiB
Rust
58 lines
2.0 KiB
Rust
//! Contains code that interfaces with the zcash_note_encryption crate from
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//! librustzcash.
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use crate::{
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block::Height,
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parameters::{Network, NetworkUpgrade},
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primitives::zcash_primitives::convert_tx_to_librustzcash,
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transaction::Transaction,
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};
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/// Returns true if all Sapling or Orchard outputs, if any, decrypt successfully with
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/// an all-zeroes outgoing viewing key.
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///
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/// # Panics
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///
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/// If passed a network/height without matching consensus branch ID (pre-Overwinter),
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/// since `librustzcash` won't be able to parse it.
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pub fn decrypts_successfully(transaction: &Transaction, network: Network, height: Height) -> bool {
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let network_upgrade = NetworkUpgrade::current(network, height);
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let alt_tx = convert_tx_to_librustzcash(transaction, network_upgrade)
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.expect("zcash_primitives and Zebra transaction formats must be compatible");
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let alt_height = height.0.into();
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let null_sapling_ovk = zcash_primitives::keys::OutgoingViewingKey([0u8; 32]);
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if let Some(bundle) = alt_tx.sapling_bundle() {
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for output in bundle.shielded_outputs().iter() {
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let recovery = zcash_primitives::sapling::note_encryption::try_sapling_output_recovery(
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&<zcash_primitives::consensus::Network>::from(network),
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alt_height,
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&null_sapling_ovk,
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output,
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);
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if recovery.is_none() {
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return false;
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}
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}
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}
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if let Some(bundle) = alt_tx.orchard_bundle() {
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for act in bundle.actions() {
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if zcash_note_encryption::try_output_recovery_with_ovk(
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&orchard::note_encryption::OrchardDomain::for_action(act),
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&orchard::keys::OutgoingViewingKey::from([0u8; 32]),
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act,
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act.cv_net(),
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&act.encrypted_note().out_ciphertext,
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)
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.is_none()
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{
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return false;
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}
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}
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}
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true
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}
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