Title

  Test IKEv2.EN.I.1.1.6.2: Cryptographic Algorithm Negotiation for CHILD_SA
  Part A: Encryption Algorithm ENCR_AES_CBC (ADVANCED)


Purpose

  To verify an IKEv2 device properly handles the Initial Exchanges using Pre-Shared key.


References

  * [RFC 4306] - Sections 2.7 and 3.3


Test Setup

  * Network Topology
      Connect the devices according to the Common Topology.
  * Configuration
      From part A to part F, configure the devices according to the Common
      Configuration except for Italic parameters.
IKE_AUTH exchanges Algorithms
Encryption Integrity Extended Sequence Numbers
Part A ENCR_AES_CBC AUTH_HMAC_SHA1_96 No Extended Sequence Numbers
  * Pre-Sequence and Cleanup Sequence
      IKEv2 on the NUT is disabled after each part.


Procedure

   NUT                  TN1
(End-Node)           (End-Node)
    |                    |
    |------------------->| IKE_SA_INIT request (HDR, SAi1, KEi, Ni)
    |                    | (Judgement #1)
    |<-------------------| IKE_SA_INIT Response (HDR, SAr1, KEr, Nr)
    |                    | (Packet #1)
    |                    |
    |------------------->| IKE_AUTH request (HDR, SK {IDi, AUTH, N, SAi2, TSi, TSr})
    |                    | (Judgement #2)
    |<-------------------| IKE_AUTH Response (HDR, SK {IDr, AUTH, N, SAr2, TSi, TSr})
    |                    | (Packet #2)
    |                    |
    |<-------------------| IPsec {Echo Request} 
    |                    | (Packet #3)
    |------------------->| IPsec {Echo Reply} 
    |                    | (Judgement #3)
    |                    |
    V                    V
 N: USE_TRANSPORT_MODE
Packet #1 See Common Packet #2
Packet #2 See Common Packet #4
Packet #3 See Common Packet #19
  Part A: Encryption Algorithm ENCR_AES_CBC (ADVANCED)
       1. NUT starts to negotiate with TN1 by sending IKE_SA_INIT request.
       2. Observe the messages transmitted on Link A.
       3. TN1 responds with an IKE_SA_INIT response to the NUT.
       4. Observe the messages transmitted on Link A.
       5. After reception of IKE_AUTH request from the NUT, TN1 responds with an IKE_AUTH
          response to the NUT
       6. TN1 transmits an Echo Request with IPsec ESP using corresponding algorithms to NUT.
       7. Observe the messages transmitted on Link A.


Observable Result

  Part A
    Step 2: Judgment #1
      The NUT transmits an IKE_SA_INIT request including "ENCR_3DES",
      "PRF_HMAC_SHA1", "AUTH_HMAC_SHA1_96" and "D-H group 2" as proposed
      lgorithms.
  
    Step 4: Judgment #2
      The NUT transmits an IKE_AUTH request including "ENCR_AES_CBC",
      "AUTH_HMAC_SHA1_96" and "No Extended Sequence Numbers" as proposed algorithms.
  
    Step 7: Judgment #3
      The NUT transmits an Echo Reply with IPsec ESP using corresponding algorithms.


Possible Problems

  * None.