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@@ -14,3 +14,5 @@ members = [ | |
| "dlc-sled-storage-provider", | ||
| "electrs-blockchain-provider", | ||
| ] | ||
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| resolver = "2" | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,37 +1,84 @@ | ||
| //! # | ||
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| use bitcoin::PublicKey as BitcoinPublicKey; | ||
| use lightning::ln::chan_utils::{derive_public_key, derive_public_revocation_key}; | ||
| use secp256k1_zkp::{PublicKey, Secp256k1, Signing, Verification}; | ||
| use bitcoin::hashes::HashEngine; | ||
| use bitcoin::hashes::{sha256::Hash as Sha256, Hash}; | ||
| use secp256k1_zkp::{PublicKey, Scalar, Secp256k1, SecretKey}; | ||
|
|
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| use crate::error::Error; | ||
|
|
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| pub(crate) fn derive_bitcoin_public_key<C: Signing>( | ||
| secp: &Secp256k1<C>, | ||
| /// Derives a per-commitment-transaction public key (eg an htlc key or a delayed_payment key) | ||
| /// from the base point and the per_commitment_key. This is the public equivalent of | ||
| /// derive_private_key - using only public keys to derive a public key instead of private keys. | ||
| /// | ||
| /// Taken from a previous version of ldk as it was refactored into something less practical to use | ||
| /// externally. | ||
| pub(crate) fn derive_public_key<T: secp256k1_zkp::Signing>( | ||
| secp_ctx: &Secp256k1<T>, | ||
| per_commitment_point: &PublicKey, | ||
| base_point: &PublicKey, | ||
| ) -> Result<BitcoinPublicKey, Error> { | ||
| let key = derive_public_key(secp, per_commitment_point, base_point) | ||
| .map_err(|e| Error::InvalidParameters(format!("Invalid point was given {}", e)))?; | ||
| Ok(BitcoinPublicKey { | ||
| compressed: true, | ||
| key, | ||
| }) | ||
| ) -> PublicKey { | ||
| let mut sha = Sha256::engine(); | ||
| sha.input(&per_commitment_point.serialize()); | ||
| sha.input(&base_point.serialize()); | ||
| let res = Sha256::from_engine(sha).to_byte_array(); | ||
|
|
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| let hashkey = PublicKey::from_secret_key( | ||
| secp_ctx, | ||
| &SecretKey::from_slice(&res) | ||
| .expect("Hashes should always be valid keys unless SHA-256 is broken"), | ||
| ); | ||
| base_point.combine(&hashkey) | ||
| .expect("Addition only fails if the tweak is the inverse of the key. This is not possible when the tweak contains the hash of the key.") | ||
| } | ||
|
|
||
| pub(crate) fn derive_bitcoin_public_revocation_key<C: Verification>( | ||
| secp: &Secp256k1<C>, | ||
| /// Derives a per-commitment-transaction revocation public key from its constituent parts. This is | ||
| /// the public equivalend of derive_private_revocation_key - using only public keys to derive a | ||
| /// public key instead of private keys. | ||
| /// | ||
| /// Only the cheating participant owns a valid witness to propagate a revoked | ||
| /// commitment transaction, thus per_commitment_point always come from cheater | ||
| /// and revocation_base_point always come from punisher, which is the broadcaster | ||
| /// of the transaction spending with this key knowledge. | ||
| /// | ||
| /// Note that this is infallible iff we trust that at least one of the two input keys are randomly | ||
| /// generated (ie our own). | ||
| /// | ||
| /// Taken from a previous version of ldk as it was refactored into something less practical to use | ||
| /// externally. | ||
| pub fn derive_public_revocation_key<T: secp256k1_zkp::Verification>( | ||
| secp_ctx: &Secp256k1<T>, | ||
| per_commitment_point: &PublicKey, | ||
| countersignatory_revocation_base_point: &PublicKey, | ||
| ) -> Result<BitcoinPublicKey, Error> { | ||
| let key = derive_public_revocation_key( | ||
| secp, | ||
| per_commitment_point, | ||
| countersignatory_revocation_base_point, | ||
| ) | ||
| .map_err(|e| Error::InvalidParameters(format!("Could not derive revocation secret: {}", e)))?; | ||
| Ok(BitcoinPublicKey { | ||
| compressed: true, | ||
| key, | ||
| }) | ||
| ) -> PublicKey { | ||
| let rev_append_commit_hash_key = { | ||
| let mut sha = Sha256::engine(); | ||
| sha.input(&countersignatory_revocation_base_point.serialize()); | ||
| sha.input(&per_commitment_point.serialize()); | ||
|
|
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| Sha256::from_engine(sha).to_byte_array() | ||
| }; | ||
| let commit_append_rev_hash_key = { | ||
| let mut sha = Sha256::engine(); | ||
| sha.input(&per_commitment_point.serialize()); | ||
| sha.input(&countersignatory_revocation_base_point.serialize()); | ||
|
|
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| Sha256::from_engine(sha).to_byte_array() | ||
| }; | ||
|
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| let countersignatory_contrib = countersignatory_revocation_base_point | ||
| .mul_tweak( | ||
| secp_ctx, | ||
| &Scalar::from_be_bytes(rev_append_commit_hash_key).unwrap(), | ||
| ) | ||
| .expect( | ||
| "Multiplying a valid public key by a hash is expected to never fail per secp256k1 docs", | ||
| ); | ||
| let broadcaster_contrib = per_commitment_point | ||
| .mul_tweak( | ||
| secp_ctx, | ||
| &Scalar::from_be_bytes(commit_append_rev_hash_key).unwrap(), | ||
| ) | ||
| .expect( | ||
| "Multiplying a valid public key by a hash is expected to never fail per secp256k1 docs", | ||
| ); | ||
| countersignatory_contrib.combine(&broadcaster_contrib) | ||
| .expect("Addition only fails if the tweak is the inverse of the key. This is not possible when the tweak commits to the key.") | ||
| } |
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