Creating a proper RADIUS Accounting-Response packet in iRules

he is creating response authenticator.

Response Authenticator

         The value of the Authenticator field in Access-Accept, Access-
         Reject, and Access-Challenge packets is called the Response
         Authenticator, and contains a one-way MD5 hash calculated over
         a stream of octets consisting of: the RADIUS packet, beginning
         with the Code field, including the Identifier, the Length, the
         Request Authenticator field from the Access-Request packet, and
         the response Attributes, followed by the shared secret.  That
         is, ResponseAuth =
         MD5(Code+ID+Length+RequestAuth+Attributes+Secret) where +
         denotes concatenation.

Remote Authentication Dial In User Service (RADIUS)