musig nonce and key derivation

taptrade-cli-demo/trader/src/cli/mod.rs

@@ -3,7 +3,7 @@ use sha2::{Digest, Sha256};
 use std::env;
 use std::io::{self, Write};
 
-use crate::wallet::{get_wallet_xprv, WalletDescriptors};
+use crate::wallet::get_wallet_xprv;
 use bdk::bitcoin::bip32::ExtendedPrivKey;
 
 #[derive(Debug)]
@@ -121,8 +121,8 @@ impl CliSettings {
 		get_wallet_xprv(None)
 	}
 
-	fn load_from_env() -> Result<TraderSettings> {
-		dotenv::from_filename(".env")?;
+	fn load_from_env(filename: &str) -> Result<TraderSettings> {
+		dotenv::from_filename(filename)?;
 		Ok(TraderSettings {
 			electrum_endpoint: env::var("ELECTRUM_ENDPOINT")?,
 			coordinator_endpoint: env::var("COORDINATOR_ENDPOINT")?,
@@ -134,16 +134,20 @@ impl CliSettings {
 		})
 	}
 
+	fn parse_trader_settings(maybe_filename: &str) -> Result<TraderSettings> {
+		match Self::get_user_input("Load from .env (y/N): ").trim() {
+			"y" => Self::load_from_env(maybe_filename),
+			"N" => Self::get_trader_settings(),
+			_ => Err(anyhow!("Not a valid input!")),
+		}
+	}
+
 	pub fn parse_cli_args() -> Result<Self> {
 		let mode = Self::get_user_input("Enter mode, 'taker' or 'maker': ");
-		let trader_settings = match Self::get_user_input("Load from .env (y/N): ").trim() {
-			"y" => Self::load_from_env()?,
-			"N" => Self::get_trader_settings()?,
-			_ => return Err(anyhow!("Not a valid input!")),
-		};
+
 		match mode.to_lowercase().as_str() {
-			"maker" => Ok(Self::Maker(trader_settings)),
-			"taker" => Ok(Self::Taker(trader_settings)),
+			"maker" => Ok(Self::Maker(Self::parse_trader_settings("maker.env")?)),
+			"taker" => Ok(Self::Taker(Self::parse_trader_settings("taker.env")?)),
 			_ => Err(anyhow!("Either select maker or taker!")),
 		}
 	}

taptrade-cli-demo/trader/src/trading/mod.rs

@@ -1,13 +1,10 @@
-// use maker_utils;
-// use taker_utils;
-// mod utils;
-
-use std::borrow::Borrow;
-
 use crate::cli::TraderSettings;
 use crate::communication::api::OfferCreationResponse;
-use crate::wallet::musig2::MusigNonce;
-use crate::wallet::{bond::Bond, load_wallet};
+use crate::wallet::{
+	bond::Bond,
+	load_wallet,
+	musig2::{MuSigData, MusigNonce},
+};
 use anyhow::Result;
 use bdk::{
 	bitcoin::block,
@@ -19,11 +16,12 @@ use bdk::{
 pub fn run_maker(maker_config: &TraderSettings) -> Result<()> {
 	let blockchain = ElectrumBlockchain::from(Client::new(&maker_config.electrum_endpoint)?);
 
-	let offer_conditions = OfferCreationResponse::fetch(maker_config)?;
-	// let offer_conditions = OfferCreationResponse {  // hardcoded for testing, locking_address is owned by .env xprv
-	//     locking_amount: 90000,
-	//     bond_address: "tb1pfdvgfzwp8vhmelpv8w9kezz7nsmxw68jz6yehgze6mzx0t6r9t2qv9ynmm".to_string(),
-	// };
+	// let offer_conditions = OfferCreationResponse::fetch(maker_config)?;
+	let offer_conditions = OfferCreationResponse {
+		// hardcoded for testing, locking_address is owned by .env xprv
+		locking_amount: 90000,
+		bond_address: "tb1pfdvgfzwp8vhmelpv8w9kezz7nsmxw68jz6yehgze6mzx0t6r9t2qv9ynmm".to_string(),
+	};
 
 	let wallet = load_wallet(maker_config, &blockchain)?; // initialize the wallet with xprv
 
@@ -31,10 +29,9 @@ pub fn run_maker(maker_config: &TraderSettings) -> Result<()> {
 																	  // blockchain.broadcast(&bond.extract_tx())?;  // publish bond to be mined for testing
 	let payout_pubkey = wallet.get_address(bdk::wallet::AddressIndex::LastUnused)?;
 
-	let musig_nonce: MusigNonce = MusigNonce::generate()?; // will be moved to a more suitable place
-
-	dbg!(&bond.extract_tx().txid());
+	let musig = MuSigData::create(&maker_config.wallet_xprv, wallet.secp_ctx())?;
 
+	// dbg!(&bond.extract_tx().txid());
 	Ok(())
 }
 

taptrade-cli-demo/trader/src/wallet/mod.rs

@@ -18,10 +18,10 @@ use bdk::{
 use std::str::FromStr;
 use wallet_utils::get_seed;
 
-pub struct WalletDescriptors {
-	pub descriptor: Bip86<ExtendedPrivKey>,
-	pub change_descriptor: Option<Bip86<ExtendedPrivKey>>,
-}
+// pub struct WalletDescriptors {
+// 	pub descriptor: Bip86<ExtendedPrivKey>,
+// 	pub change_descriptor: Option<Bip86<ExtendedPrivKey>>,
+// }
 
 pub fn get_wallet_xprv(xprv_input: Option<String>) -> Result<ExtendedPrivKey> {
 	let xprv: ExtendedPrivKey;
@@ -52,6 +52,6 @@ pub fn load_wallet(
 	)?;
 
 	wallet.sync(blockchain, SyncOptions::default())?;
-	println!("Descriptor balance: {} SAT", wallet.get_balance()?);
+	println!("Balance: {} SAT", wallet.get_balance()?);
 	Ok(wallet)
 }

taptrade-cli-demo/trader/src/wallet/musig2.rs

@@ -1,10 +1,25 @@
-use crate::wallet::wallet_utils::get_seed;
+use crate::wallet::bitcoin::key::{Parity, Secp256k1, XOnlyPublicKey};
+use crate::wallet::{wallet_utils::get_seed, KeychainKind};
 use anyhow::{anyhow, Error, Result};
+use bdk::{
+	bitcoin::{
+		bip32::ExtendedPrivKey,
+		secp256k1::{All, SecretKey},
+	},
+	keys::{DescriptorPublicKey, DescriptorSecretKey},
+	template::{Bip86, DescriptorTemplate},
+};
 use musig2::{PubNonce, SecNonce, SecNonceBuilder};
 use std::time::{SystemTime, UNIX_EPOCH};
 
 // https://docs.rs/musig2/latest/musig2/
 
+pub struct MuSigData {
+	pub nonce: MusigNonce,
+	pub public_key: (XOnlyPublicKey, Parity),
+	pub secret_key: SecretKey,
+}
+
 // secret nonce has to be used only one time!
 pub struct MusigNonce {
 	secret_nonce: SecNonce,
@@ -46,3 +61,16 @@ impl MusigNonce {
 		Ok(self.secret_nonce.public_nonce())
 	}
 }
+
+impl MuSigData {
+	pub fn create(xprv: &ExtendedPrivKey, secp_ctx: &Secp256k1<All>) -> Result<MuSigData> {
+		let nonce = MusigNonce::generate()?;
+		let keypair = xprv.to_owned().to_keypair(secp_ctx); // double check keypair, which derivation should we use?
+
+		Ok(MuSigData {
+			nonce,
+			public_key: keypair.x_only_public_key(),
+			secret_key: keypair.secret_key(),
+		})
+	}
+}