Add a method to expose KeyPackage lifetime.

openmls/src/key_packages/lifetime.rs

@@ -61,7 +61,7 @@ impl Lifetime {
     }
 
     /// Returns true if this lifetime is valid.
-    pub(crate) fn is_valid(&self) -> bool {
+    pub fn is_valid(&self) -> bool {
         match SystemTime::now()
             .duration_since(UNIX_EPOCH)
             .map(|duration| duration.as_secs())
@@ -80,6 +80,16 @@ impl Lifetime {
     pub fn has_acceptable_range(&self) -> bool {
         self.not_after.saturating_sub(self.not_before) <= MAX_LEAF_NODE_LIFETIME_RANGE_SECONDS
     }
+
+    /// Returns the "not before" timestamp of the KeyPackage.
+    pub fn not_before(&self) -> u64 {
+        self.not_before
+    }
+
+    /// Returns the "not after" timestamp of the KeyPackage.
+    pub fn not_after(&self) -> u64 {
+        self.not_after
+    }
 }
 
 impl Default for Lifetime {

openmls/src/key_packages/mod.rs

@@ -381,6 +381,11 @@ impl KeyPackage {
     pub fn last_resort(&self) -> bool {
         self.payload.extensions.contains(ExtensionType::LastResort)
     }
+
+    /// Get the lifetime of the KeyPackage
+    pub fn life_time(&self) -> &Lifetime {
+        self.payload.leaf_node.life_time().unwrap()
+    }
 }
 
 /// Crate visible `KeyPackage` functions.