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Validation Error Code
=====================
The following table defines a list of known codes and their description, which can be returned from the :ndn-cxx:`v2::Validator` interface.
Other error codes can be returned by validator implementations outside ndn-cxx codebase.
+------------+--------------------------+-----------------------------------------------------+
| Error code | Short ID | Description |
+============+==========================+=====================================================+
| 0 | NO_ERROR | No error |
+------------+--------------------------+-----------------------------------------------------+
| 1 | INVALID_SIGNATURE | Invalid signature |
+------------+--------------------------+-----------------------------------------------------+
| 2 | NO_SIGNATURE | Missing signature |
+------------+--------------------------+-----------------------------------------------------+
| 3 | CANNOT_RETRIEVE_CERT | Cannot retrieve certificate |
+------------+--------------------------+-----------------------------------------------------+
| 4 | EXPIRED_CERT | Certificate expired |
+------------+--------------------------+-----------------------------------------------------+
| 5 | LOOP_DETECTED | Loop detected in certification chain |
+------------+--------------------------+-----------------------------------------------------+
| 6 | MALFORMED_CERT | Malformed certificate |
+------------+--------------------------+-----------------------------------------------------+
| 7 | EXCEEDED_DEPTH_LIMIT | Exceeded validation depth limit |
+------------+--------------------------+-----------------------------------------------------+
| 8 | INVALID_KEY_LOCATOR | Key locator violates validation policy |
+------------+--------------------------+-----------------------------------------------------+
| .. | ... | ... |
+------------+--------------------------+-----------------------------------------------------+
| 255 | IMPLEMENTATION_ERROR | Internal implementation error |
+------------+--------------------------+-----------------------------------------------------+
Specialized validator implementations can use error codes >= 256 to indicate a specialized error.