5.40 CHAP-Challenge

5.40. CHAP-Challenge

Description

  This Attribute contains the CHAP Challenge sent by the NAS to a
  PPP Challenge-Handshake Authentication Protocol (CHAP) user.  It
  is only used in Access-Request packets.

  If the CHAP challenge value is 16 octets long it MAY be placed in
  the Request Authenticator field instead of using this attribute.

A summary of the CHAP-Challenge Attribute format is shown below. The fields are transmitted from left to right.

0                   1                   2
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- | Type | Length | String... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

Type

  60 for CHAP-Challenge.

Length

  >= 7

String

  The String field contains the CHAP Challenge.