RADIUS attribute from rfc5904

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PKM-SA-Descriptor

The PKM-SA-Descriptor Attribute is of type string and is 8 octets
      in length.  It contains three fields, described below, which
      together specify the characteristics of a PKM security
      association.  One or more instances of the PKM-SA-Descriptor
      Attribute MAY occur in an Access-Accept message.A summary of the PKM-SA-Descriptor Attribute format is shown below.
   The fields are transmitted from left to right.

                        1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |      Type     |      Len      |            SAID               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    SA Type    |                Cryptosuite                    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      142 for PKM-SA-Descriptor

   Len

      8

   SAID

      The SAID field is two octets in length and contains a PKM SAID
      ().

   SA Type

      The SA Type field is one octet in length.  The contents correspond
      to those of the Value field of an IEEE 802.16 SA-Type attribute.

   Cryptosuite

      The Cryptosuite field is 3 octets in length.  The contents
      correspond to those of the Value field of an IEEE 802.16
      Cryptographic-Suite attribute.

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