//! 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 crypto::digest::Digest;
use util::sha2::Sha256;
+use util::logger::Logger;
+use util::rng;
+use util::byte_utils;
+
+use std::time::{SystemTime, UNIX_EPOCH};
+use std::sync::Arc;
+use std::sync::atomic::{AtomicUsize, Ordering};
/// 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.
/// The output which is referenced by the given outpoint
output: TxOut,
},
- /// Outpoint commits to a P2WSH, should be spend by the following witness :
+ /// Outpoint commits to a P2WSH
+ /// P2WSH should be spend by the following witness :
/// <local_delayedsig> 0 <witnessScript>
/// With input nSequence set to_self_delay.
- /// Outputs from a HTLC-Success/Timeout tx
- DynamicOutput {
+ /// Outputs from a HTLC-Success/Timeout tx/commitment tx
+ DynamicOutputP2WSH {
/// Outpoint spendable by user wallet
outpoint: OutPoint,
- /// local_delayedkey = delayed_payment_basepoint_secret + SHA256(per_commitment_point || delayed_payment_basepoint
- local_delayedkey: SecretKey,
- /// witness redeemScript encumbering output
+ /// local_delayedkey = delayed_payment_basepoint_secret + SHA256(per_commitment_point || delayed_payment_basepoint) OR
+ key: SecretKey,
+ /// witness redeemScript encumbering output.
witness_script: Script,
/// nSequence input must commit to self_delay to satisfy script's OP_CSV
to_self_delay: u16,
+ /// The output which is referenced by the given outpoint
+ output: TxOut,
+ },
+ /// Outpoint commits to a P2WPKH
+ /// P2WPKH should be spend by the following witness :
+ /// <local_sig> <local_pubkey>
+ /// Outputs to_remote from a commitment tx
+ DynamicOutputP2WPKH {
+ /// Outpoint spendable by user wallet
+ outpoint: OutPoint,
+ /// localkey = payment_basepoint_secret + SHA256(per_commitment_point || payment_basepoint
+ key: SecretKey,
+ /// The output which is reference by the given outpoint
+ output: TxOut,
}
}
/// Get a new set of ChannelKeys for per-channel secrets. These MUST be unique even if you
/// restarted with some stale data!
fn get_channel_keys(&self, inbound: bool) -> ChannelKeys;
+ /// Get a secret for construting an onion packet
+ fn get_session_key(&self) -> SecretKey;
}
/// 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,
+ channel_child_index: AtomicUsize,
+ session_master_key: ExtendedPrivKey,
+ session_child_index: AtomicUsize,
+
+ 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");
+ let session_master_key = master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(4)).expect("Your RNG is busted");
+ KeysManager {
+ secp_ctx,
+ node_secret,
+ destination_script,
+ shutdown_pubkey,
+ channel_master_key,
+ channel_child_index: AtomicUsize::new(0),
+ session_master_key,
+ session_child_index: AtomicUsize::new(0),
+
+ 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 {
+ // We only seriously intend to rely on the channel_master_key for true secure
+ // entropy, everything else just ensures uniqueness. We generally don't expect
+ // all clients to have non-broken RNGs here, so we also include the current
+ // time as a fallback to get uniqueness.
+ let mut sha = Sha256::new();
+
+ let mut seed = [0u8; 32];
+ rng::fill_bytes(&mut seed[..]);
+ sha.input(&seed);
+
+ let now = SystemTime::now().duration_since(UNIX_EPOCH).expect("Time went backwards");
+ sha.input(&byte_utils::be32_to_array(now.subsec_nanos()));
+ sha.input(&byte_utils::be64_to_array(now.as_secs()));
+
+ let child_ix = self.channel_child_index.fetch_add(1, Ordering::AcqRel);
+ let child_privkey = self.channel_master_key.ckd_priv(&self.secp_ctx, ChildNumber::from_hardened_idx(child_ix as u32)).expect("Your RNG is busted");
+ sha.input(&child_privkey.secret_key[..]);
+
+ sha.result(&mut seed);
+ ChannelKeys::new_from_seed(&seed)
+ }
+
+ fn get_session_key(&self) -> SecretKey {
+ let mut sha = Sha256::new();
+ let mut res = [0u8; 32];
+
+ let now = SystemTime::now().duration_since(UNIX_EPOCH).expect("Time went backwards");
+ sha.input(&byte_utils::be32_to_array(now.subsec_nanos()));
+ sha.input(&byte_utils::be64_to_array(now.as_secs()));
+
+ let child_ix = self.session_child_index.fetch_add(1, Ordering::AcqRel);
+ let child_privkey = self.session_master_key.ckd_priv(&self.secp_ctx, ChildNumber::from_hardened_idx(child_ix as u32)).expect("Your RNG is busted");
+ sha.input(&child_privkey.secret_key[..]);
+ sha.result(&mut res);
+ SecretKey::from_slice(&self.secp_ctx, &res).expect("Your RNG is busted")
+ }
+}
projects / rust-lightning / blobdiff