//! on-chain output which is theirs.
use bitcoin::blockdata::transaction::{OutPoint, TxOut};
-use bitcoin::blockdata::script::Script;
+use bitcoin::blockdata::script::{Script, Builder};
+use bitcoin::blockdata::opcodes;
+use bitcoin::network::constants::Network;
+use bitcoin::util::hash::Hash160;
+use bitcoin::util::bip32::{ExtendedPrivKey, ExtendedPubKey, ChildNumber};
use secp256k1::key::{SecretKey, PublicKey};
use secp256k1::Secp256k1;
+use secp256k1;
use crypto::hkdf::{hkdf_extract,hkdf_expand};
use util::sha2::Sha256;
+use util::logger::Logger;
+
+use std::sync::Arc;
/// When on-chain outputs are created by rust-lightning an event is generated which informs the
/// user thereof. This enum describes the format of the output and provides the OutPoint.
}
/// Set of lightning keys needed to operate a channel as described in BOLT 3
+#[derive(Clone)]
pub struct ChannelKeys {
/// Private key of anchor tx
pub funding_key: SecretKey,
pub delayed_payment_base_key: SecretKey,
/// Local htlc secret key used in commitment tx htlc outputs
pub htlc_base_key: SecretKey,
- /// Local secret key used for closing tx
- pub channel_close_key: SecretKey,
- /// Local secret key used in justice tx, claim tx and preimage tx outputs
- pub channel_monitor_claim_key: SecretKey,
/// Commitment seed
pub commitment_seed: [u8; 32],
}
+impl_writeable!(ChannelKeys, 0, {
+ funding_key,
+ revocation_base_key,
+ payment_base_key,
+ delayed_payment_base_key,
+ htlc_base_key,
+ commitment_seed
+});
+
impl ChannelKeys {
/// Generate a set of lightning keys needed to operate a channel by HKDF-expanding a given
/// random 32-byte seed
hkdf_expand(Sha256::new(), &prk, b"rust-lightning htlc base key info", &mut okm);
let htlc_base_key = SecretKey::from_slice(&secp_ctx, &okm).expect("Sha256 is broken");
- hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel close key info", &mut okm);
- let channel_close_key = SecretKey::from_slice(&secp_ctx, &okm).expect("Sha256 is broken");
-
- hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel monitor claim key info", &mut okm);
- let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &okm).expect("Sha256 is broken");
-
hkdf_expand(Sha256::new(), &prk, b"rust-lightning local commitment seed info", &mut okm);
ChannelKeys {
payment_base_key: payment_base_key,
delayed_payment_base_key: delayed_payment_base_key,
htlc_base_key: htlc_base_key,
- channel_close_key: channel_close_key,
- channel_monitor_claim_key: channel_monitor_claim_key,
commitment_seed: okm
}
}
}
+
+/// Simple KeysInterface implementor that takes a 32-byte seed for use as a BIP 32 extended key
+/// and derives keys from that.
+///
+/// Your node_id is seed/0'
+/// ChannelMonitor closes may use seed/1'
+/// Cooperative closes may use seed/2'
+/// The two close keys may be needed to claim on-chain funds!
+pub struct KeysManager {
+ secp_ctx: Secp256k1<secp256k1::All>,
+ node_secret: SecretKey,
+ destination_script: Script,
+ shutdown_pubkey: PublicKey,
+ channel_master_key: ExtendedPrivKey,
+
+ logger: Arc<Logger>,
+}
+
+impl KeysManager {
+ /// Constructs a KeysManager from a 32-byte seed. If the seed is in some way biased (eg your
+ /// RNG is busted) this may panic.
+ pub fn new(seed: &[u8; 32], network: Network, logger: Arc<Logger>) -> KeysManager {
+ let secp_ctx = Secp256k1::new();
+ match ExtendedPrivKey::new_master(&secp_ctx, network.clone(), seed) {
+ Ok(master_key) => {
+ let node_secret = master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(0)).expect("Your RNG is busted").secret_key;
+ let destination_script = match master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(1)) {
+ Ok(destination_key) => {
+ let pubkey_hash160 = Hash160::from_data(&ExtendedPubKey::from_private(&secp_ctx, &destination_key).public_key.serialize()[..]);
+ Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0)
+ .push_slice(pubkey_hash160.as_bytes())
+ .into_script()
+ },
+ Err(_) => panic!("Your RNG is busted"),
+ };
+ let shutdown_pubkey = match master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(2)) {
+ Ok(shutdown_key) => ExtendedPubKey::from_private(&secp_ctx, &shutdown_key).public_key,
+ Err(_) => panic!("Your RNG is busted"),
+ };
+ let channel_master_key = master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(3)).expect("Your RNG is busted");
+ KeysManager {
+ secp_ctx,
+ node_secret,
+ destination_script,
+ shutdown_pubkey,
+ channel_master_key,
+
+ logger,
+ }
+ },
+ Err(_) => panic!("Your rng is busted"),
+ }
+ }
+}
+
+impl KeysInterface for KeysManager {
+ fn get_node_secret(&self) -> SecretKey {
+ self.node_secret.clone()
+ }
+
+ fn get_destination_script(&self) -> Script {
+ self.destination_script.clone()
+ }
+
+ fn get_shutdown_pubkey(&self) -> PublicKey {
+ self.shutdown_pubkey.clone()
+ }
+
+ fn get_channel_keys(&self, _inbound: bool) -> ChannelKeys {
+ let channel_pubkey = ExtendedPubKey::from_private(&self.secp_ctx, &self. channel_master_key);
+ let mut seed = [0; 32];
+ for (arr, slice) in seed.iter_mut().zip((&channel_pubkey.public_key.serialize()[0..32]).iter()) {
+ *arr = *slice;
+ }
+ ChannelKeys::new_from_seed(&seed)
+ }
+}
projects / rust-lightning / blobdiff