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AH + ESP Interoperability



hello,
	I am new to this mailing list and have a couple of questions.
First, is there a searchable archive for this list?  
	The second question is wrt Interoperability and authentication.
What is the accepted method of authentication calculation pertaining to
crypto libraries?  I have seen different implementations with different
methods.

One implementation does it as.
Update(ipheader)
Update(AH hdr + data)
Final

Another implementation does it as
Update(ipheader)
Update(AH hdr)
Update(padding)
Update(data)
Final

The RFC specifies
Update(pdu)
Final


	I apologize if this has been discussed before and would appreciate
pointers to relevant information 

Thanks
Murtaza


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