feat: extracting transaction witness

.config/dictionaries/project.dic

@@ -224,6 +224,7 @@ upnp
 utimensat
 vitss
 vkey
+vkeywitness
 VKEYS
 voteplan
 voteplans

hermes/crates/cardano-chain-follower/src/lib.rs

@@ -21,6 +21,7 @@ mod point;
 mod snapshot_id;
 mod stats;
 mod utils;
+mod witness;
 
 pub use chain_sync_config::ChainSyncConfig;
 pub use chain_update::{ChainUpdate, Kind};

hermes/crates/cardano-chain-follower/src/multi_era_block_data.rs

@@ -17,6 +17,7 @@ use crate::{
     metadata,
     point::{ORIGIN_POINT, UNKNOWN_POINT},
     stats::stats_invalid_block,
+    witness::TxWitness,
     Network, Point,
 };
 
@@ -52,6 +53,9 @@ pub struct MultiEraBlockInner {
     data: SelfReferencedMultiEraBlock,
     /// Decoded Metadata in the transactions in the block.
     metadata: metadata::DecodedTransaction,
+    /// A map of public key hashes to the public key and transaction numbers they are in.
+    #[allow(dead_code)]
+    witness_map: Option<TxWitness>,
 }
 
 /// Multi-era block.
@@ -97,6 +101,8 @@ impl MultiEraBlock {
         let self_ref_block = builder.try_build()?;
         let decoded_block = self_ref_block.borrow_block();
 
+        let witness_map = TxWitness::new(&decoded_block.txs()).ok();
+
         let slot = decoded_block.slot();
 
         let point = Point::new(slot, decoded_block.hash().to_vec());
@@ -146,6 +152,7 @@ impl MultiEraBlock {
                 previous: previous.clone(),
                 data: self_ref_block,
                 metadata,
+                witness_map,
             }),
         })
     }
@@ -228,6 +235,12 @@ impl MultiEraBlock {
     pub fn txn_raw_metadata(&self, txn_idx: usize, label: u64) -> Option<Arc<Vec<u8>>> {
         self.inner.metadata.get_raw_metadata(txn_idx, label)
     }
+
+    /// Returns the witness map for the block.
+    #[allow(dead_code)]
+    pub(crate) fn witness_map(&self) -> Option<&TxWitness> {
+        self.inner.witness_map.as_ref()
+    }
 }
 
 impl Display for MultiEraBlock {
@@ -308,7 +321,7 @@ impl PartialOrd<Point> for MultiEraBlock {
 }
 
 #[cfg(test)]
-mod tests {
+pub(crate) mod tests {
     use std::ops::Add;
 
     use anyhow::Ok;
@@ -343,12 +356,18 @@ mod tests {
             .expect("Failed to decode hex block.")
     }
 
-    /// Allegra Test Block data
-    fn alonzo_block() -> Vec<u8> {
+    /// Alonzo Test Block data
+    pub(crate) fn alonzo_block() -> Vec<u8> {
         hex::decode(include_str!("./../test_data/allegra.block"))
             .expect("Failed to decode hex block.")
     }
 
+    /// Babbage Test Block data
+    pub(crate) fn babbage_block() -> Vec<u8> {
+        hex::decode(include_str!("./../test_data/babbage.block"))
+            .expect("Failed to decode hex block.")
+    }
+
     /// An array of test blocks
     fn test_blocks() -> Vec<TestRecord> {
         vec![

hermes/crates/cardano-chain-follower/src/utils.rs

@@ -1,5 +1,7 @@
 //! Simple general purpose utility functions.
 
+use blake2b_simd::{self, Params};
+
 /// Convert T to an i16. (saturate if out of range.)
 #[allow(dead_code)]
 pub(crate) fn i16_from_saturating<T: TryInto<i16>>(value: T) -> i16 {
@@ -28,3 +30,20 @@ pub(crate) fn usize_from_saturating<
         }
     }
 }
+
+/// Convert the given value to `blake2b_244` array.
+pub(crate) fn blake2b_244(value: &[u8]) -> anyhow::Result<[u8; 28]> {
+    let h = Params::new().hash_length(28).hash(value);
+    let b = h.as_bytes();
+    b.try_into()
+        .map_err(|_| anyhow::anyhow!("Invalid length of blake2b_244, expected 28 got {}", b.len()))
+}
+
+#[allow(dead_code)]
+/// Convert the given value to `blake2b_256` array.
+pub(crate) fn blake2b_256(value: &[u8]) -> anyhow::Result<[u8; 32]> {
+    let h = Params::new().hash_length(32).hash(value);
+    let b = h.as_bytes();
+    b.try_into()
+        .map_err(|_| anyhow::anyhow!("Invalid length of blake2b_256, expected 32 got {}", b.len()))
+}

hermes/crates/cardano-chain-follower/src/witness.rs

@@ -0,0 +1,136 @@
+//! Transaction Witness
+use std::fmt::{Display, Formatter};
+
+use dashmap::DashMap;
+use pallas::{codec::utils::Bytes, ledger::traverse::MultiEraTx};
+
+use crate::utils::blake2b_244;
+
+/// `WitnessMap` type of `DashMap` with
+/// key as [u8; 28] = (`blake2b_244` hash of the public key)
+/// value as (Bytes, Vec<u8>) = (public key, tx index within the block)
+#[allow(dead_code)]
+pub(crate) type WitnessMap = DashMap<[u8; 28], (Bytes, Vec<u8>)>;
+
+#[derive(Debug)]
+#[allow(dead_code)]
+/// `TxWitness` struct to store the witness data.
+pub(crate) struct TxWitness(WitnessMap);
+
+#[allow(dead_code)]
+impl TxWitness {
+    /// Create a new `TxWitness` from a list of `MultiEraTx`.
+    pub(crate) fn new(txs: &[MultiEraTx]) -> anyhow::Result<Self> {
+        let map: WitnessMap = DashMap::new();
+        for (i, tx) in txs.iter().enumerate() {
+            match tx {
+                MultiEraTx::AlonzoCompatible(tx, _) => {
+                    let witness_set = &tx.transaction_witness_set;
+                    if let Some(vkey_witness_set) = witness_set.vkeywitness.clone() {
+                        for vkey_witness in vkey_witness_set {
+                            let vkey_hash = blake2b_244(&vkey_witness.vkey)?;
+                            let tx_num = u8::try_from(i)?;
+                            map.entry(vkey_hash)
+                                .and_modify(|entry: &mut (_, Vec<u8>)| entry.1.push(tx_num))
+                                .or_insert((vkey_witness.vkey.clone(), vec![tx_num]));
+                        }
+                    };
+                },
+                MultiEraTx::Babbage(tx) => {
+                    let witness_set = &tx.transaction_witness_set;
+                    if let Some(vkey_witness_set) = witness_set.vkeywitness.clone() {
+                        for vkey_witness in vkey_witness_set {
+                            let vkey_hash = blake2b_244(&vkey_witness.vkey)?;
+                            let tx_num = u8::try_from(i)?;
+                            map.entry(vkey_hash)
+                                .and_modify(|entry: &mut (_, Vec<u8>)| entry.1.push(tx_num))
+                                .or_insert((vkey_witness.vkey.clone(), vec![tx_num]));
+                        }
+                    }
+                },
+                MultiEraTx::Conway(tx) => {
+                    let witness_set = &tx.transaction_witness_set;
+                    if let Some(vkey_witness_set) = &witness_set.vkeywitness.clone() {
+                        for vkey_witness in vkey_witness_set {
+                            let vkey_hash = blake2b_244(&vkey_witness.vkey)?;
+                            let tx_num = u8::try_from(i)?;
+                            map.entry(vkey_hash)
+                                .and_modify(|entry: &mut (_, Vec<u8>)| entry.1.push(tx_num))
+                                .or_insert((vkey_witness.vkey.clone(), vec![tx_num]));
+                        }
+                    }
+                },
+                _ => {},
+            };
+        }
+        Ok(Self(map))
+    }
+
+    /// Check whether the public key hash is in the given transaction number.
+    pub(crate) fn check_witness_in_tx(&self, vkey_hash: &[u8; 28], tx_num: u8) -> bool {
+        self.0
+            .get(vkey_hash)
+            .map_or(false, |entry| entry.1.contains(&tx_num))
+    }
+
+    /// Get the actual address from the given public key hash.
+    pub(crate) fn get_witness_pk_addr(&self, vkey_hash: &[u8; 28]) -> Option<Bytes> {
+        self.0.get(vkey_hash).map(|entry| entry.0.clone())
+    }
+}
+
+impl Display for TxWitness {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        for data in &self.0 {
+            let vkey_hash = hex::encode(data.key());
+            let vkey: Vec<u8> = data.0.clone().into();
+            let vkey_encoded = hex::encode(&vkey);
+            writeln!(
+                f,
+                "Key Hash: {}, PublicKey: {}, Tx: {:?}",
+                vkey_hash, vkey_encoded, data.1
+            )?;
+        }
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+    use crate::multi_era_block_data::tests::{alonzo_block, babbage_block};
+
+    #[test]
+    fn tx_witness() {
+        let alonzo = alonzo_block();
+        let alonzo_block = pallas::ledger::traverse::MultiEraBlock::decode(&alonzo)
+            .expect("Failed to decode MultiEraBlock");
+        let txs_alonzo = alonzo_block.txs();
+        let tx_witness_alonzo = TxWitness::new(&txs_alonzo).expect("Failed to create TxWitness");
+        let vkey1_hash: [u8; 28] =
+            hex::decode("6082eb618d161a704207a0b3a9609e820111570d94d1e711b005386c")
+                .expect("Failed to decode vkey1_hash")
+                .try_into()
+                .expect("Invalid length of vkey1_hash");
+        println!("{tx_witness_alonzo}");
+        assert!(tx_witness_alonzo.get_witness_pk_addr(&vkey1_hash).is_some());
+        assert!(tx_witness_alonzo.check_witness_in_tx(&vkey1_hash, 0));
+
+        let babbage = babbage_block();
+        let babbage_block = pallas::ledger::traverse::MultiEraBlock::decode(&babbage)
+            .expect("Failed to decode MultiEraBlock");
+        let txs_babbage = babbage_block.txs();
+        let tx_witness_babbage = TxWitness::new(&txs_babbage).expect("Failed to create TxWitness");
+        let vkey2_hash: [u8; 28] =
+            hex::decode("ba4ab50bdecca85162f3b8114739bc5ba3aaa6490e2b1d15ad0f9c66")
+                .expect("Failed to decode vkey2_hash")
+                .try_into()
+                .expect("Invalid length of vkey2_hash");
+        println!("{tx_witness_babbage}");
+        assert!(tx_witness_babbage
+            .get_witness_pk_addr(&vkey2_hash)
+            .is_some());
+        assert!(tx_witness_babbage.check_witness_in_tx(&vkey2_hash, 0));
+    }
+}

hermes/crates/cardano-chain-follower/test_data/babbage.block

@@ -0,0 +1 @@
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