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fix(hashing): improve byte array conversion methods #2279

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fix(hashing): improve byte array conversion methods #2279

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52e21fd
save dev state
borngraced Nov 20, 2024
4172a70
update
borngraced Nov 20, 2024
d265d8b
fix errors
borngraced Nov 20, 2024
c0be642
panic on invalid expected_secret_hash input
borngraced Nov 21, 2024
29a0e1d
Remove unsafe From<&[u8]> impl for hashes
shamardy Nov 29, 2024
62d2b75
fix `ElectrumBlockHeaderV14` hex and hash
shamardy Nov 29, 2024
38da226
fix bug in `extract_destinations`
shamardy Nov 29, 2024
67a960c
check if test_tendermint_tx_history is fixed
shamardy Nov 29, 2024
7175084
test electrum block header v1.4 hashing implementation
shamardy Nov 29, 2024
48b699d
Merge remote-tracking branch 'origin/dev' into fix-hash-from-slice-arr
shamardy Dec 6, 2024
ad0741d
remove core import in mm2.rs
shamardy Dec 10, 2024
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15 changes: 8 additions & 7 deletions mm2src/coins/eth.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1500,7 +1500,7 @@ impl SwapOps for EthCoin {
_secret_hash: &[u8],
spend_tx: &[u8],
watcher_reward: bool,
) -> Result<Vec<u8>, String> {
) -> Result<[u8; 32], String> {
let unverified: UnverifiedTransactionWrapper = try_s!(rlp::decode(spend_tx));
let function_name = get_function_name("receiverSpend", watcher_reward);
let function = try_s!(SWAP_CONTRACT.function(&function_name));
Expand All @@ -1522,7 +1522,7 @@ impl SwapOps for EthCoin {
return ERR!("Invalid arguments in 'receiverSpend' call: {:?}", tokens);
}
match &tokens[2] {
Token::FixedBytes(secret) => Ok(secret.to_vec()),
Token::FixedBytes(secret) => Ok(try_s!(secret.as_slice().try_into())),
_ => ERR!(
"Expected secret to be fixed bytes, decoded function data is {:?}",
tokens
Expand Down Expand Up @@ -1572,27 +1572,28 @@ impl SwapOps for EthCoin {
| EthPrivKeyPolicy::HDWallet {
activated_key: ref key_pair,
..
} => key_pair_from_secret(key_pair.secret().as_bytes()).expect("valid key"),
} => key_pair_from_secret(key_pair.secret().as_fixed_bytes()).expect("valid key"),
EthPrivKeyPolicy::Trezor => todo!(),
#[cfg(target_arch = "wasm32")]
EthPrivKeyPolicy::Metamask(_) => todo!(),
}
}

#[inline]
fn derive_htlc_pubkey(&self, _swap_unique_data: &[u8]) -> Vec<u8> {
fn derive_htlc_pubkey(&self, _swap_unique_data: &[u8]) -> [u8; 33] {
match self.priv_key_policy {
EthPrivKeyPolicy::Iguana(ref key_pair)
| EthPrivKeyPolicy::HDWallet {
activated_key: ref key_pair,
..
} => key_pair_from_secret(key_pair.secret().as_bytes())
} => key_pair_from_secret(&key_pair.secret().to_fixed_bytes())
.expect("valid key")
.public_slice()
.to_vec(),
.try_into()
.expect("valid key length!"),
EthPrivKeyPolicy::Trezor => todo!(),
#[cfg(target_arch = "wasm32")]
EthPrivKeyPolicy::Metamask(ref metamask_policy) => metamask_policy.public_key.as_bytes().to_vec(),
EthPrivKeyPolicy::Metamask(ref metamask_policy) => metamask_policy.public_key.0,
}
}

Expand Down
18 changes: 10 additions & 8 deletions mm2src/coins/lightning.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -73,7 +73,7 @@ use secp256k1v24::PublicKey;
use serde::Deserialize;
use serde_json::Value as Json;
use std::collections::{HashMap, HashSet};
use std::convert::TryInto;
use std::convert::{TryFrom, TryInto};
use std::fmt;
use std::io::Cursor;
use std::net::SocketAddr;
Expand Down Expand Up @@ -793,13 +793,13 @@ impl SwapOps for LightningCoin {
_secret_hash: &[u8],
spend_tx: &[u8],
_watcher_reward: bool,
) -> Result<Vec<u8>, String> {
) -> Result<[u8; 32], String> {
let payment_hash = payment_hash_from_slice(spend_tx).map_err(|e| e.to_string())?;
let payment_hex = hex::encode(payment_hash.0);

match self.db.get_payment_from_db(payment_hash).await {
Ok(Some(payment)) => match payment.preimage {
Some(preimage) => Ok(preimage.0.to_vec()),
Some(preimage) => Ok(preimage.0),
None => ERR!("Preimage for payment {} should be found on the database", payment_hex),
},
Ok(None) => ERR!("Payment {} is not in the database when it should be!", payment_hex),
Expand Down Expand Up @@ -857,8 +857,8 @@ impl SwapOps for LightningCoin {
}

#[inline]
fn derive_htlc_pubkey(&self, _swap_unique_data: &[u8]) -> Vec<u8> {
self.channel_manager.get_our_node_id().serialize().to_vec()
fn derive_htlc_pubkey(&self, _swap_unique_data: &[u8]) -> [u8; 33] {
self.channel_manager.get_our_node_id().serialize()
}

#[inline]
Expand Down Expand Up @@ -1046,7 +1046,8 @@ impl MarketCoinOps for LightningCoin {
.map_err(|_| SignatureError::InternalError("Error accessing node keys".to_string()))?;
let private = Private {
prefix: 239,
secret: H256::from(*secret_key.as_ref()),
secret: H256::from_slice(secret_key.as_ref())
.map_to_mm(|err| SignatureError::InvalidRequest(err.to_string()))?,
compressed: true,
checksum_type: ChecksumType::DSHA256,
};
Expand All @@ -1058,10 +1059,11 @@ impl MarketCoinOps for LightningCoin {
let message_hash = self
.sign_message_hash(message)
.ok_or(VerificationError::PrefixNotFound)?;
let signature = CompactSignature::from(
let signature = CompactSignature::try_from(
zbase32::decode_full_bytes_str(signature)
.map_err(|e| VerificationError::SignatureDecodingError(e.to_string()))?,
);
)
.map_to_mm(|err| VerificationError::SignatureDecodingError(err.to_string()))?;
let recovered_pubkey = Public::recover_compact(&H256::from(message_hash), &signature)?;
Ok(recovered_pubkey.to_string() == pubkey)
}
Expand Down
2 changes: 1 addition & 1 deletion mm2src/coins/lightning/ln_platform.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,7 @@ pub async fn update_best_block(
)
},
ElectrumBlockHeader::V14(h) => {
let block_header = match deserialize(&h.hex.into_vec()) {
let block_header = match deserialize(&h.hex.0) {
Ok(header) => header,
Err(e) => {
error!("Block header deserialization error: {}", e.to_string());
Expand Down
4 changes: 2 additions & 2 deletions mm2src/coins/lp_coins.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1119,7 +1119,7 @@ pub trait SwapOps {
secret_hash: &[u8],
spend_tx: &[u8],
watcher_reward: bool,
) -> Result<Vec<u8>, String>;
) -> Result<[u8; 32], String>;

fn check_tx_signed_by_pub(&self, tx: &[u8], expected_pub: &[u8]) -> Result<bool, MmError<ValidatePaymentError>>;

Expand Down Expand Up @@ -1151,7 +1151,7 @@ pub trait SwapOps {
fn derive_htlc_key_pair(&self, swap_unique_data: &[u8]) -> KeyPair;

/// Derives an HTLC key-pair and returns a public key corresponding to that key.
fn derive_htlc_pubkey(&self, swap_unique_data: &[u8]) -> Vec<u8>;
fn derive_htlc_pubkey(&self, swap_unique_data: &[u8]) -> [u8; 33];

fn validate_other_pubkey(&self, raw_pubkey: &[u8]) -> MmResult<(), ValidateOtherPubKeyErr>;

Expand Down
4 changes: 2 additions & 2 deletions mm2src/coins/qrc20.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -992,7 +992,7 @@ impl SwapOps for Qrc20Coin {
secret_hash: &[u8],
spend_tx: &[u8],
_watcher_reward: bool,
) -> Result<Vec<u8>, String> {
) -> Result<[u8; 32], String> {
self.extract_secret_impl(secret_hash, spend_tx)
}

Expand Down Expand Up @@ -1034,7 +1034,7 @@ impl SwapOps for Qrc20Coin {
utxo_common::derive_htlc_key_pair(self.as_ref(), swap_unique_data)
}

fn derive_htlc_pubkey(&self, swap_unique_data: &[u8]) -> Vec<u8> {
fn derive_htlc_pubkey(&self, swap_unique_data: &[u8]) -> [u8; 33] {
utxo_common::derive_htlc_pubkey(self, swap_unique_data)
}

Expand Down
75 changes: 40 additions & 35 deletions mm2src/coins/qrc20/history.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,9 @@ impl TxInternalId {
return ERR!("Incorrect bytes len {}, expected {}", bytes.len(), EXPECTED_LEN);
}

let tx_hash: H256Json = bytes[0..32].into();
let mut tx_hash = [0u8; 32];
tx_hash.copy_from_slice(&bytes[0..32]);
let tx_hash = H256Json::from(tx_hash);

let buf = bytes[32..].to_vec();
let mut cursor = Cursor::new(buf);
Expand Down Expand Up @@ -192,7 +194,7 @@ impl Qrc20Coin {
let receipts = try_s!(self.utxo.rpc_client.get_transaction_receipts(&tx_hash).compat().await);
// request Qtum transaction details to get a tx_hex, timestamp, block_height and calculate a miner_fee
let mut input_transactions = HistoryUtxoTxMap::new();
let qtum_details = try_s!(utxo_common::tx_details_by_hash(self, &tx_hash.0, &mut input_transactions).await);
let qtum_details = try_s!(utxo_common::tx_details_by_hash(self, &tx_hash, &mut input_transactions).await);
// Deserialize the UtxoTx to get a script pubkey
let qtum_tx: UtxoTx = try_s!(deserialize(
try_s!(qtum_details.tx.tx_hex().ok_or("unexpected tx type")).as_slice()
Expand Down Expand Up @@ -823,17 +825,21 @@ fn is_transfer_event_log(log: &LogEntry) -> bool {
mod tests {
use super::*;
use common::block_on;
use hex::FromHex;
use mm2_metrics::{MetricType, MetricsJson, MetricsOps};
use mm2_test_helpers::for_tests::find_metrics_in_json;
use qrc20_tests::qrc20_coin_for_test;

#[test]
fn test_tx_internal_id() {
let tx_hash = hex::decode("39104d29d77ba83c5c6c63ab7a0f096301c443b4538dc6b30140453a40caa80a").unwrap();
let expected_id = TxInternalId::new(tx_hash.as_slice().into(), 13, 257);
let tx_hash: [u8; 32] = hex::decode("39104d29d77ba83c5c6c63ab7a0f096301c443b4538dc6b30140453a40caa80a")
.unwrap()
.try_into()
.unwrap();
let expected_id = TxInternalId::new(tx_hash.into(), 13, 257);
let actual_bytes: BytesJson = expected_id.clone().into();

let mut expected_bytes = tx_hash;
let mut expected_bytes = Vec::from(tx_hash);
expected_bytes.extend_from_slice(&[0, 0, 0, 0, 0, 0, 0, 13]);
expected_bytes.extend_from_slice(&[0, 0, 0, 0, 0, 0, 1, 1]);
assert_eq!(actual_bytes, expected_bytes.into());
Expand All @@ -852,10 +858,10 @@ mod tests {
let (ctx, coin) = qrc20_coin_for_test(priv_key, None);
ctx.metrics.init();

let tx_hash: H256Json = hex::decode("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.as_slice()
.into();
let tx_hash: H256Json =
<[u8; 32]>::from_hex("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.into();
let tx_height = 699545;
let transfer_map_expected = block_on(coin.transfer_details_by_hash(tx_hash)).unwrap();

Expand Down Expand Up @@ -884,10 +890,10 @@ mod tests {
let (ctx, coin) = qrc20_coin_for_test(priv_key, None);
ctx.metrics.init();

let tx_hash: H256Json = hex::decode("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.as_slice()
.into();
let tx_hash: H256Json =
<[u8; 32]>::from_hex("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.into();
let tx_height = 699545;
let transfer_map_expected = block_on(coin.transfer_details_by_hash(tx_hash)).unwrap();

Expand Down Expand Up @@ -926,20 +932,19 @@ mod tests {
let (ctx, coin) = qrc20_coin_for_test(priv_key, None);
ctx.metrics.init();

let tx_hash: H256Json = hex::decode("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.as_slice()
.into();
let tx_hash: H256Json =
<[u8; 32]>::from_hex("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.into();
let tx_height = 699545;
let transfer_map_expected = block_on(coin.transfer_details_by_hash(tx_hash)).unwrap();

let mut transfer_map_unexpected_tx_id = transfer_map_expected
.into_iter()
.map(|(mut id, tx)| {
// just another tx_hash
id.tx_hash = hex::decode("8a7270110ab7b56142b3bac89999276beb70320a7fe7666f460a05aa615eb0a0")
id.tx_hash = <[u8; 32]>::from_hex("8a7270110ab7b56142b3bac89999276beb70320a7fe7666f460a05aa615eb0a0")
.unwrap()
.as_slice()
.into();
(id, tx)
})
Expand All @@ -966,10 +971,10 @@ mod tests {
];
let (ctx, coin) = qrc20_coin_for_test(priv_key, None);

let tx_hash: H256Json = hex::decode("35e03bc529528a853ee75dde28f27eec8ed7b152b6af7ab6dfa5d55ea46f25ac")
.unwrap()
.as_slice()
.into();
let tx_hash: H256Json =
<[u8; 32]>::from_hex("35e03bc529528a853ee75dde28f27eec8ed7b152b6af7ab6dfa5d55ea46f25ac")
.unwrap()
.into();
let tx_height = 681443;
let transfer_map_expected = block_on(coin.transfer_details_by_hash(tx_hash)).unwrap();
let mut history_map_expected = HistoryMapByHash::new();
Expand All @@ -991,10 +996,10 @@ mod tests {
];
let (ctx, coin) = qrc20_coin_for_test(priv_key, None);

let tx_hash: H256Json = hex::decode("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.as_slice()
.into();
let tx_hash: H256Json =
<[u8; 32]>::from_hex("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.into();
let tx_height = 699545;
let transfer_map_expected = block_on(coin.transfer_details_by_hash(tx_hash)).unwrap();
let mut history_map_expected = HistoryMapByHash::new();
Expand All @@ -1019,14 +1024,14 @@ mod tests {
let metrics = MetricsArc::new();
metrics.init();

let tx_hash_invalid: H256Json = hex::decode("0000000000000000000000000000000000000000000000000000000000000000")
.unwrap()
.as_slice()
.into();
let tx_hash: H256Json = hex::decode("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.as_slice()
.into();
let tx_hash_invalid: H256Json =
<[u8; 32]>::from_hex("0000000000000000000000000000000000000000000000000000000000000000")
.unwrap()
.into();
let tx_hash: H256Json =
<[u8; 32]>::from_hex("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb")
.unwrap()
.into();
let tx_height = 699545;
let transfer_map_expected = block_on(coin.transfer_details_by_hash(tx_hash)).unwrap();
let mut history_map_expected = HistoryMapByHash::new();
Expand Down
14 changes: 7 additions & 7 deletions mm2src/coins/qrc20/qrc20_tests.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -481,8 +481,8 @@ fn test_extract_secret() {
];
let (_ctx, coin) = qrc20_coin_for_test(priv_key, None);

let expected_secret = &[1; 32];
let secret_hash = &*dhash160(expected_secret);
let expected_secret = [1; 32];
let secret_hash = &*dhash160(&expected_secret);

// taker spent maker payment - d3f5dab4d54c14b3d7ed8c7f5c8cc7f47ccf45ce589fdc7cd5140a3c1c3df6e1
let tx_hex = hex::decode("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").unwrap();
Expand All @@ -505,10 +505,10 @@ fn test_extract_secret_malicious() {
// 1 - with an invalid secret (this case should be processed correctly)
// 2 - correct spend tx
let spend_tx = hex::decode("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").unwrap();
let expected_secret = &[1; 32];
let secret_hash = &*dhash160(expected_secret);
let expected_secret = [1; 32];
let secret_hash = &*dhash160(&expected_secret);
let actual = block_on(coin.extract_secret(secret_hash, &spend_tx, false));
assert_eq!(actual, Ok(expected_secret.to_vec()));
assert_eq!(actual, Ok(expected_secret));
}

#[test]
Expand Down Expand Up @@ -569,10 +569,10 @@ fn test_transfer_details_by_hash() {
];
let (_ctx, coin) = qrc20_coin_for_test(priv_key, None);
let tx_hash_bytes = hex::decode("85ede12ccc12fb1709c4d9e403e96c0c394b0916f2f6098d41d8dfa00013fcdb").unwrap();
let tx_hash: H256Json = tx_hash_bytes.as_slice().into();
let tx_hash: [u8; 32] = tx_hash_bytes.clone().try_into().unwrap();
let tx_hex:BytesJson = hex::decode("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").unwrap().into();

let details = block_on(coin.transfer_details_by_hash(tx_hash)).unwrap();
let details = block_on(coin.transfer_details_by_hash(tx_hash.into())).unwrap();
let mut it = details.into_iter().sorted_by(|(id_x, _), (id_y, _)| id_x.cmp(id_y));

let expected_fee_details = |total_gas_fee: &str| -> TxFeeDetails {
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