Merge pull request #104 from dfns/key_info_epub

`key_share`: add HD-related methods to `DirtyKeyInfo`

Author: survived

key-share/CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## v0.4.1
+* Add HD-related methods to `DirtyKeyInfo` [#104]
+
+[#104]: https://github.com/dfns/cggmp21/pull/104
+
 ## v0.4.0
 * Update `udigest` to v0.2
 * Update `generic-ec` to v0.4

key-share/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "key-share"
-version = "0.4.0"
+version = "0.4.1"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "Key share of any Threshold Signature Scheme (TSS)"

key-share/src/lib.rs

@@ -407,7 +407,7 @@ impl<E: Curve> DirtyKeyInfo<E> {
 }
 
 #[cfg(feature = "hd-wallets")]
-impl<E: Curve> DirtyCoreKeyShare<E> {
+impl<E: Curve> DirtyKeyInfo<E> {
     /// Checks whether the key is HD-capable
     pub fn is_hd_wallet(&self) -> bool {
         self.chain_code.is_some()
@@ -441,6 +441,33 @@ impl<E: Curve> DirtyCoreKeyShare<E> {
     }
 }
 
+#[cfg(feature = "hd-wallets")]
+impl<E: Curve> DirtyCoreKeyShare<E> {
+    /// Checks whether the key is HD-capable
+    pub fn is_hd_wallet(&self) -> bool {
+        (**self).is_hd_wallet()
+    }
+
+    /// Returns extended public key, if HD support was enabled
+    pub fn extended_public_key(&self) -> Option<slip_10::ExtendedPublicKey<E>> {
+        (**self).extended_public_key()
+    }
+
+    /// Derives child public key, if it's HD key
+    pub fn derive_child_public_key<ChildIndex>(
+        &self,
+        derivation_path: impl IntoIterator<Item = ChildIndex>,
+    ) -> Result<
+        slip_10::ExtendedPublicKey<E>,
+        HdError<<ChildIndex as TryInto<slip_10::NonHardenedIndex>>::Error>,
+    >
+    where
+        slip_10::NonHardenedIndex: TryFrom<ChildIndex>,
+    {
+        (**self).derive_child_public_key(derivation_path)
+    }
+}
+
 impl<E: Curve> CoreKeyShare<E> {
     /// Returns amount of key co-holders
     pub fn n(&self) -> u16 {