Error
Error Code:
3931
MySQL Error 3931: Invalid Key Type in UDF
Description
Error 3931 in MySQL indicates that a function, typically a user-defined function (UDF) interacting with the keyring plugin, failed because the key it attempted to use has an invalid or incompatible type. This usually occurs when a cryptographic operation expects a specific key format (e.g., AES, RSA), but the key retrieved from the keyring does not conform to that expectation.
Error Message
Function '%s' failed because key type is invalid.
Known Causes
4 known causesIncorrect Key Type Specification
The key was created in the keyring with a type that is not supported by the function attempting to use it, or the function was called with an expectation for a different key type.
Mismatched Key Usage
A function designed for a specific cryptographic operation (e.g., encryption with AES) attempted to use a key that is intended for a different purpose or has a different underlying algorithm (e.g., an RSA key).
Corrupted or Malformed Key
The key stored in the keyring might be corrupted or malformed, leading the function to misinterpret its type as invalid during retrieval.
Keyring Plugin Misconfiguration
Issues with the keyring plugin's configuration could indirectly lead to keys being misinterpreted or loaded incorrectly, resulting in invalid type errors for UDFs.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service