reuse rlp to make hash

Signed-off-by: Naohiro Yoshida <[email protected]>

light-client/src/header/eth_header.rs

@@ -415,72 +415,7 @@ impl TryFrom<RawETHHeader> for ETHHeader {
             return Err(Error::UnexpectedNonce(number));
         }
 
-        // create block hash
-        let mut stream = RlpStream::new();
-        stream.begin_unbounded_list();
-        stream.append(&parent_hash);
-        stream.append(&uncle_hash);
-        stream.append(&coinbase);
-        stream.append(&root.to_vec());
-        stream.append(&tx_hash);
-        stream.append(&receipt_hash);
-        stream.append(&bloom);
-        stream.append(&difficulty);
-        stream.append(&number);
-        stream.append(&gas_limit);
-        stream.append(&gas_used);
-        stream.append(&timestamp);
-        stream.append(&extra_data);
-        stream.append(&mix_digest);
-        stream.append(&nonce);
-
-        if base_fee_per_gas.is_some()
-            || withdrawals_hash.is_some()
-            || blob_gas_used.is_some()
-            || excess_blob_gas.is_some()
-            || parent_beacon_root.is_some()
-        {
-            if let Some(v) = base_fee_per_gas {
-                stream.append(&v);
-            } else {
-                stream.append_empty_data();
-            }
-        }
-        if withdrawals_hash.is_some()
-            || blob_gas_used.is_some()
-            || excess_blob_gas.is_some()
-            || parent_beacon_root.is_some()
-        {
-            if let Some(v) = &withdrawals_hash {
-                stream.append(v);
-            } else {
-                stream.append_empty_data();
-            }
-        }
-        if blob_gas_used.is_some() || excess_blob_gas.is_some() || parent_beacon_root.is_some() {
-            if let Some(v) = blob_gas_used {
-                stream.append(&v);
-            } else {
-                stream.append_empty_data();
-            }
-        }
-        if excess_blob_gas.is_some() || parent_beacon_root.is_some() {
-            if let Some(v) = excess_blob_gas {
-                stream.append(&v);
-            } else {
-                stream.append_empty_data();
-            }
-        }
-        if parent_beacon_root.is_some() {
-            if let Some(v) = &parent_beacon_root {
-                stream.append(v);
-            } else {
-                stream.append_empty_data();
-            }
-        }
-        stream.finalize_unbounded_list();
-        let buffer_vec: Vec<u8> = stream.out().to_vec();
-        let hash: Hash = keccak_256(&buffer_vec);
+        let hash: Hash = keccak_256(&value.header.as_slice());
 
         let epoch = if number % BLOCKS_PER_EPOCH == 0 {
             let (validators, turn_length) = get_validator_bytes_and_turn_length(&extra_data)?;