fix: include exception detail in shared-key decrypt error

at_client/atclient.py

@@ -145,7 +145,7 @@ def get_encryption_key_shared_by_me(self, key: SharedKey):
         try:
             return EncryptionUtil.rsa_decrypt_from_base64(response.get_raw_data_response(), self.keys[KeysUtil.encryption_private_key_name])
         except Exception as e:
-            raise AtDecryptionException(f"Failed to decrypt {to_lookup} - e")
+            raise AtDecryptionException(f"Failed to decrypt {to_lookup} - {e}")
 
     def get_encryption_key_shared_by_other(self, shared_key: SharedKey):
         shared_shared_key_name = shared_key.get_shared_shared_key_name()

test/decrypt_error_test.py

@@ -0,0 +1,35 @@
+import unittest
+from unittest.mock import MagicMock
+
+from at_client import AtClient
+from at_client.common import AtSign
+from at_client.common.keys import SharedKey
+from at_client.util.keysutil import KeysUtil
+from at_client.exception.atexception import AtDecryptionException
+
+
+class DecryptErrorDetailTest(unittest.TestCase):
+    """The shared-key decrypt error must include the real exception, not literal 'e'."""
+
+    def test_error_includes_exception_detail(self):
+        client = AtClient.__new__(AtClient)  # bypass network __init__
+        client.atsign = AtSign("@alice")
+        client.keys = {KeysUtil.encryption_private_key_name: "not-a-valid-private-key"}
+
+        resp = MagicMock()
+        resp.is_error.return_value = False
+        resp.get_raw_data_response.return_value = "not-valid-rsa-ciphertext"
+        client.secondary_connection = MagicMock()
+        client.secondary_connection.execute_command.return_value = resp
+
+        key = SharedKey("k", AtSign("@alice"), AtSign("@bob"))
+        with self.assertRaises(AtDecryptionException) as ctx:
+            client.get_encryption_key_shared_by_me(key)
+
+        msg = str(ctx.exception)
+        self.assertFalse(msg.rstrip().endswith("- e"))   # the bug printed a literal 'e'
+        self.assertIn("Failed to decrypt", msg)
+
+
+if __name__ == "__main__":
+    unittest.main()