RSVP message authentication

RFC 2747 defines the use of a message digest carried in the RSVP INTEGRITY object. This object carries the following information:

Key ID: An 8-bit number unique to a given sender.
Sequence Number: A 64-bit monotonically increasing sequence number.
Keyed Message Digest: As implemented here using MD5, it is a 16-bit message digest.

In order to support RFC 2747, this implementation supports the following:

An authentication type using the MD5 cryptographic algorithm.
An authentication key for use with the authentication algorithm.
An authentication window of one (1), which specifies that the maximum number of authenticated messages that can be received out of order is one (1).

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