1 use bitcoin::util::hash::Sha256dHash;
2 use bitcoin::blockdata::transaction::OutPoint as BitcoinOutPoint;
4 /// A reference to a transaction output.
5 /// Differs from bitcoin::blockdata::transaction::OutPoint as the index is a u16 instead of u32
6 /// due to LN's restrictions on index values. Should reduce (possibly) unsafe conversions this way.
7 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
9 /// The referenced transaction's txid.
10 pub txid: Sha256dHash,
11 /// The index of the referenced output in its transaction's vout.
16 /// Creates a new `OutPoint` from the txid and the index.
17 pub fn new(txid: Sha256dHash, index: u16) -> OutPoint {
18 OutPoint { txid, index }
21 /// Convert an `OutPoint` to a lightning channel id.
22 pub fn to_channel_id(&self) -> [u8; 32] {
23 let mut res = [0; 32];
24 res[..].copy_from_slice(&self.txid[..]);
25 res[30] ^= ((self.index >> 8) & 0xff) as u8;
26 res[31] ^= ((self.index >> 0) & 0xff) as u8;
30 pub fn into_bitcoin_outpoint(self) -> BitcoinOutPoint {
33 vout: self.index as u32,
40 use chain::transaction::OutPoint;
42 use bitcoin::blockdata::transaction::Transaction;
43 use bitcoin::network::serialize;
48 fn test_channel_id_calculation() {
49 let tx: Transaction = serialize::deserialize(&hex::decode("020000000001010e0adef48412e4361325ac1c6e36411299ab09d4f083b9d8ddb55fbc06e1b0c00000000000feffffff0220a1070000000000220020f81d95e040bd0a493e38bae27bff52fe2bb58b93b293eb579c01c31b05c5af1dc072cfee54a3000016001434b1d6211af5551905dc2642d05f5b04d25a8fe80247304402207f570e3f0de50546aad25a872e3df059d277e776dda4269fa0d2cc8c2ee6ec9a022054e7fae5ca94d47534c86705857c24ceea3ad51c69dd6051c5850304880fc43a012103cb11a1bacc223d98d91f1946c6752e358a5eb1a1c983b3e6fb15378f453b76bd00000000").unwrap()[..]).unwrap();
50 assert_eq!(&OutPoint {
53 }.to_channel_id(), &hex::decode("3e88dd7165faf7be58b3c5bb2c9c452aebef682807ea57080f62e6f6e113c25e").unwrap()[..]);
54 assert_eq!(&OutPoint {
57 }.to_channel_id(), &hex::decode("3e88dd7165faf7be58b3c5bb2c9c452aebef682807ea57080f62e6f6e113c25f").unwrap()[..]);