rename EmptyIdentity -> DerivingRoot

Seems to fit better what the error actually means.

2 files changed, 3 insertions, 3 deletions

diff --git a/src/error.rs b/src/error.rs
index a79b8e0..4a5c204 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -14,8 +14,8 @@ pub enum Error {
 
     /// Error returned when trying to derive the root identity, as there is no parent key for the
     /// root.
-    #[error("The supplied identity had no elements")]
-    EmptyIdentity,
+    #[error("Cannot derive the root identity")]
+    DerivingRoot,
 
     /// Error when the given ciphertext was malformed.
     ///
diff --git a/src/kem.rs b/src/kem.rs
index a8261b6..091247d 100644
--- a/src/kem.rs
+++ b/src/kem.rs
@@ -298,7 +298,7 @@ impl<M> HybridKem<M> {
     {
         let identity = self.mapper.map_identity(identity)?;
         let Some((child, parent)) = identity.split_last() else {
-            return Err(Error::EmptyIdentity);
+            return Err(Error::DerivingRoot);
         };
         let private_key = self
             .hibe