Merge pull request #66 from tnull/2023-04-allow-mnemonics

Allow to configure seed via a BIP 39 mnemonic

Author: tnull

Cargo.toml

@@ -41,10 +41,11 @@ lightning-transaction-sync = { git = "https://github.com/lightningdevkit/rust-li
 #lightning-rapid-gossip-sync = { path = "../rust-lightning/lightning-rapid-gossip-sync" }
 #lightning-transaction-sync = { path = "../rust-lightning/lightning-transaction-sync", features = ["esplora-async"] }
 
-bdk = { version = "0.28.0", default-features = false, features = ["std", "async-interface", "use-esplora-async", "sqlite-bundled"]}
+bdk = { version = "0.28.0", default-features = false, features = ["std", "async-interface", "use-esplora-async", "sqlite-bundled", "keys-bip39"]}
 reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls"] }
 rusqlite = { version = "0.28.0", features = ["bundled"] }
 bitcoin = "0.29.2"
+bip39 = "2.0.0"
 
 rand = "0.8.5"
 chrono = "0.4"

src/lib.rs

@@ -81,6 +81,7 @@ mod test;
 mod types;
 mod wallet;
 
+pub use bip39;
 pub use bitcoin;
 pub use lightning;
 pub use lightning_invoice;
@@ -191,6 +192,7 @@ impl Default for Config {
 enum WalletEntropySource {
 	SeedFile(String),
 	SeedBytes([u8; WALLET_KEYS_SEED_LEN]),
+	Bip39Mnemonic { mnemonic: bip39::Mnemonic, passphrase: Option<String> },
 }
 
 /// A builder for an [`Node`] instance, allowing to set some configuration and module choices from
@@ -230,6 +232,16 @@ impl Builder {
 		self
 	}
 
+	/// Configures the [`Node`] instance to source its wallet entropy from a [BIP 39] mnemonic.
+	///
+	/// [BIP 39]: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
+	pub fn set_entropy_bip39_mnemonic(
+		&mut self, mnemonic: bip39::Mnemonic, passphrase: Option<String>,
+	) -> &mut Self {
+		self.entropy_source = Some(WalletEntropySource::Bip39Mnemonic { mnemonic, passphrase });
+		self
+	}
+
 	/// Sets the used storage directory path.
 	///
 	/// Default: `/tmp/ldk_node/`
@@ -293,6 +305,10 @@ impl Builder {
 				WalletEntropySource::SeedFile(seed_path) => {
 					io::utils::read_or_generate_seed_file(seed_path)
 				}
+				WalletEntropySource::Bip39Mnemonic { mnemonic, passphrase } => match passphrase {
+					Some(passphrase) => mnemonic.to_seed(passphrase),
+					None => mnemonic.to_seed(""),
+				},
 			}
 		} else {
 			// Default to read or generate from the default location generate a seed file.