RADIUS attribute from rfc5090

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Digest-Algorithm

This attribute holds the algorithm parameter that influences
         the HTTP Digest calculation.  It MUST only be used in Access-
         Request, Access-Challenge and Accounting-Request packets.  If
         this attribute is missing, MD5 is assumed.
   Type
         111 for Digest-Algorithm
   Length
         >= 3
   Text
         In Access-Requests, the RADIUS client takes the value of the
         algorithm directive (as described in)
         from the HTTP-style request it wants to authenticate.  In
         Access-Challenge packets, the RADIUS server SHOULD put the
         desired algorithm into this attribute.

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