Can you point to a specification saying how this hashing works?

A---------->B(nsis server)--------->C(radius server)

User A generates a large buffer which contains various Authentication
Attributes, A hash of this string is generated using MD5 algorithm with a
key known to both users A and C, This string is appended to the original
string and sent over the network, Node B get this string and it extract
various session attributes from this string.

The attributes extracted should be used to construct the diameter message
using freeradius client library.

On 4/12/07, [EMAIL PROTECTED] <
[EMAIL PROTECTED]> wrote:Date: Thu, 12 Apr 2007
10:23:51 +0200
From: Alan DeKok <[EMAIL PROTECTED]>
Subject: Re: Generating AAA message for freeradius.
To: FreeRadius users mailing list
Content-Type: text/plain; charset=ISO-8859-1

Prateek Gupta wrote:
User A sends the NSIS request with its keyed hash (generated using User
A's key) appended to it to the NSIS server. Now the NSIS server needs to
authenticate that request with a Radius server.

Can you point to a specification saying how this hashing works?

Is there a way to do this i.e. how to generate a AAA message with the
information available i.e. a string, its keyed hash and User A's id ?
Assuming that the Radius server has keys of all legitimate users.


Alan DeKok.
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