implement __hash__() method for Ed25519Key

makes Ed25519Key objs comparable, needed for host keys

paramiko/ed25519key.py

@@ -167,6 +167,13 @@ def asbytes(self):
         m.add_string(v.encode())
         return m.asbytes()
 
+    def __hash__(self):
+        if self.can_sign():
+            v = self._signing_key.verify_key
+        else:
+            v = self._verifying_key
+        return hash((self.get_name(), v))
+
     def get_name(self):
         return "ssh-ed25519"
 

tests/test_pkey.py

@@ -455,9 +455,18 @@ def test_ed25519(self):
         key2 = Ed25519Key.from_private_key_file(
             test_path('test_ed25519_password.key'), b'abc123'
         )
-
         self.assertNotEqual(key1.asbytes(), key2.asbytes())
 
+    def test_ed25519_compare(self):
+        # verify that the private & public keys compare equal
+        key = Ed25519Key.from_private_key_file(test_path('test_ed25519.key'))
+        self.assertEqual(key, key)
+        pub = Ed25519Key(data=key.asbytes())
+        self.assertTrue(key.can_sign())
+        self.assertTrue(not pub.can_sign())
+        self.assertEqual(key, pub)
+
+
     def test_keyfile_is_actually_encrypted(self):
         # Read an existing encrypted private key
         file_ = test_path('test_rsa_password.key')