RADIUS attribute from rfc5090

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Digest-Nonce

This attribute holds a nonce to be used in the HTTP Digest
         calculation.  If the Access-Request had a Digest-Method and a
         Digest-URI but no Digest-Nonce Attribute, the RADIUS server
         MUST put a Digest-Nonce Attribute into its Access-Challenge
         packet.  This attribute MUST only be used in Access-Request and
         Access-Challenge packets.
   Type
         105 for Digest-Nonce
   Length
         >= 3Text
         In Access-Requests, the RADIUS client takes the value of the
         nonce directive (nonce-value in ) without surrounding
         quotes from the HTTP-style request it wants to authenticate.
         In Access-Challenge packets, the attribute contains the nonce
         selected by the RADIUS server.

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