Add parity-npub commmand.

Cargo.toml

@@ -34,6 +34,7 @@ log = "0.4.17"
 mime = "0.3"
 mime_guess = "2.0"
 nom = "7.1.3"
+nostr = "0.25.0"
 nostr-sdk = "0.25.0"
 once_cell = "1.17.1"
 par-stream = { version = "0.10.2", features = ["runtime-tokio"] }

src/bin/carbonadod.rs

@@ -11,11 +11,18 @@ use log::error;
 enum Commands {
     /// Start storage provider node with configured frontends
     Start,
+    /// Derive the parity npub from nsec
+    ParityNpub {
+        /// Nostr secret key
+        #[arg(long)]
+        nsec: String,
+    },
 }
 
 pub async fn try_main() -> Result<()> {
     match Commands::parse() {
         Commands::Start => carbonado_node::start().await?,
+        Commands::ParityNpub { nsec } => carbonado_node::parity_npub(&nsec)?,
     }
 
     Ok(())

src/lib.rs

@@ -40,3 +40,22 @@ pub async fn start() -> Result<()> {
 
     Ok(())
 }
+
+pub fn parity_npub(nsec: &str) -> Result<()> {
+    use nostr::{secp256k1::SecretKey, FromBech32, Keys, ToBech32};
+
+    let secret_key = SecretKey::from_bech32(nsec)?;
+    let keys = Keys::new(secret_key);
+    let (pk, parity) = keys.normalized_public_key()?.x_only_public_key();
+
+    println!(
+        "Parity npub is: {}{}",
+        match parity {
+            secp256k1::Parity::Even => '+',
+            secp256k1::Parity::Odd => '-',
+        },
+        pk.to_bech32()?
+    );
+
+    Ok(())
+}