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@@ -19,9 +19,18 @@
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use std::{io, iter};
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-use monero::{consensus::Encodable as XmrEncodable, cryptonote::hash::Hashable, VarInt};
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+use log::warn;
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+use monero::{
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+ blockdata::transaction::{ExtraField, RawExtraField, SubField},
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+ consensus::Encodable as XmrEncodable,
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+ cryptonote::hash::Hashable,
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+ VarInt,
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+};
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+use primitive_types::U256;
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+use sha2::{Digest, Sha256};
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use tiny_keccak::{Hasher, Keccak};
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+use super::merkle_tree_parameters::MerkleTreeParameters;
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use crate::{
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blockchain::{
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header_store::HeaderHash,
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@@ -31,6 +40,7 @@ use crate::{
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MoneroPowData,
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},
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},
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+ Error,
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Error::MoneroMergeMineError,
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Result,
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};
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@@ -136,3 +146,94 @@ pub fn construct_monero_data(
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aux_chain_merkle_proof,
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})
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}
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+
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+fn check_aux_chains(
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+ monero_data: &MoneroPowData,
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+ merge_mining_params: VarInt,
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+ aux_chain_merkle_root: &monero::Hash,
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+ darkfi_hash: HeaderHash,
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+ darkfi_genesis_hash: HeaderHash,
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+) -> bool {
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+ let df_hash = monero::Hash::from_slice(darkfi_hash.as_slice());
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+
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+ if merge_mining_params == VarInt(0) {
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+ // Interpret 0 as only 1 chain
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+ if df_hash == *aux_chain_merkle_root {
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+ return true
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+ }
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+ }
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+
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+ let merkle_tree_params = MerkleTreeParameters::from_varint(merge_mining_params);
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+ if merkle_tree_params.number_of_chains() == 0 {
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+ return false
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+ }
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+
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+ let hash_position = U256::from_little_endian(
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+ &Sha256::new()
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+ .chain_update(darkfi_genesis_hash.as_slice())
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+ .chain_update(merkle_tree_params.aux_nonce().to_le_bytes())
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+ .chain_update((109_u8).to_le_bytes())
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+ .finalize(),
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+ )
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+ .low_u32() %
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+ u32::from(merkle_tree_params.number_of_chains());
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+
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+ let (merkle_root, pos) = monero_data
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+ .aux_chain_merkle_proof
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+ .calculate_root_with_pos(&df_hash, merkle_tree_params.number_of_chains());
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+
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+ if hash_position != pos {
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+ return false
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+ }
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+
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+ merkle_root == *aux_chain_merkle_root
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+}
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+
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+// Parsing an extra field from bytes will always return an extra field with sub-fields
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+// that could be read, even if it does not represent the original extra field. As per
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+// Monero consensus rules, an error here will not represent a failure to deserialize a
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+// block, so no need to error here.
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+fn parse_extra_field_truncate_on_error(raw_extra_field: &RawExtraField) -> ExtraField {
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+ match ExtraField::try_parse(raw_extra_field) {
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+ Ok(val) => val,
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+ Err(val) => {
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+ warn!(
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+ target: "validator::xmr::helpers",
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+ "[MERGEMINING] Some sub-fields could not be parsed from the Monero coinbase",
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+ );
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+ val
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+ }
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+ }
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+}
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+
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+/// Extracts the Monero block hash from the coinbase transaction's extra field
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+pub fn extract_aux_merkle_root_from_block(monero: &monero::Block) -> Result<Option<monero::Hash>> {
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+ // When we extract the merge mining hash, we do not care if
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+ // the extra field can be parsed without error.
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+ let extra_field = parse_extra_field_truncate_on_error(&monero.miner_tx.prefix.extra);
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+
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+ // Only one merge mining tag is allowed
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+ let merge_mining_hashes: Vec<monero::Hash> = extra_field
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+ .0
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+ .iter()
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+ .filter_map(|item| {
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+ if let SubField::MergeMining(_depth, merge_mining_hash) = item {
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+ Some(*merge_mining_hash)
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+ } else {
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+ None
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+ }
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+ })
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+ .collect();
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+
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+ if merge_mining_hashes.len() > 1 {
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+ return Err(Error::MoneroMergeMineError(
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+ "More than one merge mining tag found in coinbase".to_string(),
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+ ))
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+ }
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+
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+ if let Some(merge_mining_hash) = merge_mining_hashes.into_iter().next() {
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+ Ok(Some(merge_mining_hash))
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+ } else {
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+ Ok(None)
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+ }
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+}
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parazyd