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https://github.com/Cuprate/cuprate.git
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c840053854
* consensus: enable workspace lints * rules/fast-sync: enable workspace lints * typos * fixes * `PoW` -> proof-of-work
51 lines
2 KiB
Rust
51 lines
2 KiB
Rust
//! Version 1 ring signature verification.
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//!
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//! Some checks have to be done at deserialization or with data we don't have so we can't do them here, those checks are:
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//! <https://monero-book.cuprate.org/consensus_rules/transactions/ring_signatures.html#signatures-must-be-canonical>
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//! this happens at deserialization in monero-serai.
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//! <https://monero-book.cuprate.org/consensus_rules/transactions/ring_signatures.html#amount-of-signatures-in-a-ring>
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//! and this happens during ring signature verification in monero-serai.
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//!
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use monero_serai::{ring_signatures::RingSignature, transaction::Input};
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#[cfg(feature = "rayon")]
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use rayon::prelude::*;
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use super::{Rings, TransactionError};
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use crate::try_par_iter;
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/// Verifies the ring signature.
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///
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/// ref: <https://monero-book.cuprate.org/consensus_rules/transactions/ring_signatures.html>
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pub(crate) fn check_input_signatures(
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inputs: &[Input],
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signatures: &[RingSignature],
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rings: &Rings,
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tx_sig_hash: &[u8; 32],
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) -> Result<(), TransactionError> {
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match rings {
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Rings::Legacy(rings) => {
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// <https://monero-book.cuprate.org/consensus_rules/transactions/ring_signatures.html#amount-of-ring-signatures>
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// rings.len() != inputs.len() can't happen but check any way.
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if signatures.len() != inputs.len() || rings.len() != inputs.len() {
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return Err(TransactionError::RingSignatureIncorrect);
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}
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try_par_iter(inputs)
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.zip(rings)
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.zip(signatures)
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.try_for_each(|((input, ring), sig)| {
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let Input::ToKey { key_image, .. } = input else {
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panic!("How did we build a ring with no decoys?");
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};
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if !sig.verify(tx_sig_hash, ring, key_image) {
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return Err(TransactionError::RingSignatureIncorrect);
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}
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Ok(())
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})?;
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}
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Rings::RingCT(_) => panic!("tried to verify v1 tx with a non v1 ring"),
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}
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Ok(())
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}
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