Validates the legitimacy of the response
To be able to validate the response, the md5Value option must have been set in the processor. If the md5Value is not set this function will fail gracefully, but this MAY CHANGE IN THE FUTURE!
Check if the response is legitimate by matching MD5 hashes. To avoid MD5 mismatch while the key is being renewed the md5Value can be an array with 2 indexes: "new" and "old" respectively holding the new and old MD5 values.
Note: If you're having problem passing this check: be aware that the login name is CASE-SENSITIVE!!! (even though you can log in using it all lowered case...)